您的位置：360文档中心› 外文译文及原文

外文译文及原文

合集下载

什么使薪酬看起来合理？【外文翻译】

什么使薪酬看起来合理？【外文翻译】

外文文献翻译译文一：外文原文原文：What Make a Salary Seem ReasonableHighhouse Scoot，Brooks-Laber Margaret EAlthough considerable research attention has been directed at understanding perceptions of salary fairness, very little attention has been given to how salary expectations are formed or how trivial elements of the job search context may influence these expectations.Twoexp eriments demonstrated how the simple manipulation of response options for a multiple-choice item may influence subsequent salary expectations and salary satisfaction. Results are discussed in light of Parducci's(1995) contextual theory.It has been repeatedly shown that the way in which a question is asked can influence perceptions of what is normal. For example, Harris found that people who were asked 'How short was the basketball player?' estimated lower heights than people who were asked 'How tall was the basketball player?' Similarly, Loftus found that people who were asked 'Do you get headaches frequently?' reported more headaches than people asked 'Do you get headaches occasionally?' More recently, Norbert Schwarz and his colleagues identified numerous examples of how the wording of survey items can strongly impact self reports. For example, Schwarz reported research showing that people claimed a higher life success when the numeric values of a life-success item ranged from -5 to + 5, than when they ranged from 0 to 10. He described another study showing that psychosomatic patients reported symptom frequencies of more than twice a month when the item's response scale ranged from 'twice a month or less' to 'several times per day', but did not do so when the scale ranged from 'never' to 'more than twice a month'. Schwarz suggested that respondents to surveys assumethat the values in the middle range of a scale reflect the 'typical' value in the 'real world', whereas the extremes of the scale correspond to the extremes of the distribution. More provocative is the finding that, in addition to affecting respondents' behavioural reports on surveys, these simple context effects may also affect subsequent judgments. For example, patients in Schwarz and Scheuring's study reported a higher health satisfaction when the response scale suggested that their symptom frequency was below average.Similar to the Schwarz and Scheuring study, our research examined the effects of response scales on subsequent judgments. However,the response-scale paradigm was used to examine broader theoretical issues regarding the impact of the job-seeking context on expectations about pay. Despite the importance of starting salary in the job choice process,very little research has focused on factors that has focused on incumbent satisfaction with organizational pay noted that the existing meagre research on job-seeker expectations for staring salary is more fragmented than programmatic.The authors suggested that researchers draw from the vast literature on decision-making to understand how individual and situational factors influence salary perceptions.Our failure to find effects consistent with adaptation-level theory for our sample of job seekers was consistent with Parducci, Calfee, Marshall, and Davidson's (1960) failure to support adaptation-level theory predictions in the lab. Parducci and his colleagues found that, holding all else constant, variation in the mean of a distribution of numbers had no effect on student perceptions of the typical number. Similary, Ordóñez et al. (2000), in a study of distributive fairness perceptions, found that MBAs presented with two reference salaries (i.e., salary of a peer paid higher and salary of a peer paid lower) did not average these reference points in the manner predicted by adaptation-level theory. Ordóñez and her colleagues recommended that future research examine what happens when people are presented with more than two reference salaries.Parducci's (1995) contextual theory generally proposes that attribute judgments reflect a compromise between a range principle and a frequency principle. Most relevant tothe present concern is the frequency principle, which is a tendency for people to assign the same number of contextual representations to equal segments of the scale of judgment. For example, if fewer than one half of salaries available in the immediate context (e.g., salaries in classified advertisements) are below a particular salary, that salary is perceived to be in the bottom half of the scale of judgment. As another simple example, consider a summer job seeker whose three friends have accepted jobs with hourly rates of $5, $10, and $11. An offer of $8.50 may be perceived to be near the bottom of salaries available in the market, because two of the three available strategies are above that offer, even though it is objectively above the midpoint of the salaries of his friends. A related phenomenon, called the alternative-outcomes effect (Windschitl & Wells, 1998), has been observed for people judging the likelihood of winning a raffle. In one study, participants were presented with two different raffles involving 10 tickets. In the first situation, they were told 'You hold 3 tickets and seven other people each hold 1.' In the second situation, they were told 'You hold 3 tickets and one other person holds 7.' People felt much more certain of winning in the situation where they held more tickets than any individual competitor (3-1-1-1-1-1-1-1) than when they held fewer tickets ( 3-7), despite the fact that the probability of winning either raffle is the same. In both this example and the previous hypothetical salary examples, people are influenced by the context in which information is presented, ignoring the absolute value of the current situation. Contextual theory posits that when events that elicit hedonic judgments are concentrated at the upper endpoints of their contexts, they elicit greater happiness, regardless of the absolute levels of the events. This means that an important factor influencing satisfaction with any particular outcome is the placement of that outcome relative to other possible outcomes, or the proportion of contextual representations below that outcome. Other researchers have also suggested that reference points are not combined into a single comparison point (Kahneman, 1992) and that satisfaction is determined instead by the relative frequencies of positive and negative events (Diener, Sandvik, & Pavot, 1990). When applied to starting salary expectations, these models seem to suggest that the frequency of salary options above and below a targetsalary, not the lower and upper bounds of the salary distribution, will influence starting salary expectations. The experiments were designed to examine this proposition within the context of a simple multiple-choice item on a career-expectations survey.Participants were business students (N= 204) enrolled at a medium-sized public university in the Midwestern United States. Participation occurred during class time in seven marketing classes, ranging in size from 21 to 37 students. The majority (i.e., 90%) of the students were juniors or seniors, and male (52%). The average participant was 21 years of age. A'career attitudes survey' was designed that contained seven typical items inquiring about students' plans after graduation, along with demographic questions. Items were in multiple-choice and open-ended formats, and addressed issues such as how many jobs the students planned to apply for, what methods they planned to use to find jobs, and the nature of their expected first job. Embedded within the survey was the starting salary item that was the focus of the endpoint-level and option-frequency manipulations. The item read 'What do you expect your starting salary to be?' Participants received one of four response scales differing on the two factors. Table 1 presents the response options by endpoints of the range (low= $15,000-50,000; high= $30,000-65,000) and frequency of multiple-choice options above a target salary(low frequency; high frequency). The overall range roughly corresponded with the range of annual starting salaries of recent graduates from the business school (i.e., $21,000-65,000). Note that the manipulation of range endpoints (see Fig. 1) is distinct from a manipulation of range width, which has appeared in earlier research by Rynes et al. (1983) and Highhouse et al. (1999). The width of the salary range (i.e., $35,000) remained constant across experimental conditions in our study. The option-frequency manipulation was designed using $40,000 as the target salary(low frequency = 1 response option above $40,000; high frequency = 4 response options above $40,000). The target salary is the midpoint of the entire salary range (i.e., half the distance between the lowest salary in the low endpoint level condition and the highest salary in the high endpoint level condition). Each participant received one endpoint level and one frequency condition in a2 x 2between-subjects factorial design.Although previous research has shown that the social environment can have an impact on perceptions of a fair staring salary, far fewer studies have investigated the impact of contextual features of the decision-marking environment that may influence salary expectations. The research that does exist has focused on the width of the range of salaries available in the market. Our research builds on this work by showing that factors other than range width may influence salary expectations. Drawing from Parducci's contextual theory. We expected that, holding salary range constant, the frequency of salary options above and below a target salary would influence salary expectations independent of the level of the endpoints of salaries in the market. Our first experiment, using the manipulated response-option paradigm, showed that the frequency of response options above a target salary in the response categories for an item on a typical career survey influenced later reports of expected staring salary for a group of business majors. Contrary to Helson's adaptation-level theory, the salary endpoint level had no effect on expectations for this group. Thus, consistent with Parducci's proposition, our findings showed that one must consider not only the level of the endpoints of salaries in the immediate context but also the perceived frequency of salaries. The second experiment showed that these effects can extend beyond salary expectations to influence satisfaction with job offers. The frequency of response options above the midpoint salary in a multiple-choice item had a main effect on salary satisfaction and job attractiveness for psychology students presented 20 min later with a hypothetical job advertisement.These research results suggest that salary expectations,at least for naive job seekers,can be influenced by simple features of the contextual environment. Unfortunately, longitudinal investigations are highly dynamic.Future research is needed that employs more moment-to-moment assessments(see Stone, Shiffman,& DeCries, 1999)of job seekers' salary expectations.We do suspect,however,that our results are not limited to the simple numerical anchors set up in our experiments.Considerable research has shown that simple numerical anchors can strongly influence judgments of experts as well as novices (e.g, Northcraft andNeale,1987).Similarly, studies using such varied experts as agricultural judges (Gaeth Shanteau,1984) ,parole offices (Carroll& Payne, 1976),and court judges (Ebbesen & Konecni,1975) have concluded that the experience of these judges does not make them less susceptible to simple context effects.Barber and Bretz(2000) noted that understanding how different contexts can evoke difference in how a given salary offer will be evaluated is important for organizations"as organizations cannot predict employee reactions to pay practices without knowledge of the standards against which those practices will be evaluated" We believe that,in addition to the importance of this knowledge for organizations,such knowledge is important for job seekers. Job seekers need to be aware that their salary expectations can be inadvertently affected by their exposure to salaries that may or may not be meaningful to their situation.People are constantly faced with skewed distributions of salaries because they tend to hear more about fellow job seekers who were paid high salaries than they are to hear about fellow job seekers who were paid the industry average. This creates a cognitive context in which offered salaries are likely to be perceived as being in the bottom half of the scale of judgement,even when they are objectively near the middle of the distributions of salaries. This could be positive if it leads employees to hold high expectations of pay,as these expectations may be associated with higher negotiated salaries.Generally,though,it is important for job seekers to realize when they are being affected by context.Job seekers need to be aware of the danger of marking inferences from small saiples,as small samples of salaries may not represent the salary distribution in the population of relevant jobs.Demonstrating context dependence may be as simple as showing people how a multiple-choice option on a typical survey can influence their standards for appropriate pay.Future research might consider whether such basic training techniques can inoculate job seekers against simple context effects.Source：Frequency Context Effects On Starting-Salary Expectations. Journal of Occupational & Organizational Psychology, V olume 67, 2003(1): P69二、翻译文章译文：什么使薪酬看起来合理？虽然很多研究工作应该注意理解对工资公平、怎样看管给出了期望的薪水如何形成或者是多么微不足道的要素影响上下文可以找工作的这些期望。

毕设外文原文及译文

毕设外文原文及译文

北京联合大学毕业设计（论文）任务书题目：OFDM调制解调技术的设计与仿真实现专业：通信工程指导教师：张雪芬学院：信息学院学号：2011080331132班级：1101B姓名：徐嘉明一、外文原文Evolution Towards 5G Multi-tier Cellular WirelessNetworks:An Interference ManagementPerspectiveEkram Hossain, Mehdi Rasti, Hina Tabassum, and Amr AbdelnasserAbstract—The evolving fifth generation (5G) cellular wireless networks are envisioned to overcome the fundamental challenges of existing cellular networks, e.g., higher data rates, excellent end-to-end performance and user-coverage in hot-spots and crowded areas with lower latency, energy consumption and cost per information transfer. To address these challenges, 5G systems will adopt a multi-tier architecture consisting of macrocells, different types of licensed small cells, relays, and device-to-device (D2D) networks to serve users with different quality-of-service (QoS) requirements in a spectrum and energy-efficient manner. Starting with the visions and requirements of 5G multi-tier networks, this article outlines the challenges of interference management (e.g., power control, cell association) in these networks with shared spectrum access (i.e., when the different network tiers share the same licensed spectrum). It is argued that the existing interference management schemes will not be able to address the interference management problem in prioritized 5G multitier networks where users in different tiers have different priorities for channel access. In this context, a survey and qualitative comparison of the existing cell association and power control schemes is provided to demonstrate their limitations for interference management in 5G networks. Open challenges are highlighted and guidelines are provided to modify the existing schemes in order to overcome these limitations and make them suitable for the emerging 5G systems.Index Terms—5G cellular wireless, multi-tier networks, interference management, cell association, power control.I. INTRODUCTIONTo satisfy the ever-increasing demand for mobile broadband communications, the IMT-Advanced (IMT-A) standards have been ratified by the International Telecommunications Union (ITU) in November 2010 and the fourth generation (4G) wireless communication systems are currently being deployed worldwide. The standardization for LTE Rel-12, also known as LTE-B, is also ongoing and expected to be finalized in 2014. Nonetheless, existing wireless systems will not be able to deal with the thousand-fold increase in total mobile broadband data [1] contributed by new applications and services such as pervasive 3D multimedia, HDTV, VoIP, gaming, e-Health, and Car2x communication. In this context, the fifth generation (5G) wireless communication technologies are expected to attain 1000 times higher mobile data volume per unit area,10-100 times higher number of connecting devices and user data rate, 10 times longer battery life and 5 times reduced latency [2]. While for 4G networks the single-user average data rate is expected to be 1 Gbps, it is postulated that cell data rate of theorder of 10 Gbps will be a key attribute of 5G networks.5G wireless networks are expected to be a mixture of network tiers of different sizes, transmit powers, backhaul connections, different radio access technologies (RATs) that are accessed by an unprecedented numbers of smart and heterogeneous wireless devices. This architectural enhancement along with the advanced physical communications technology such as high-order spatial multiplexing multiple-input multiple-output (MIMO) communications will provide higher aggregate capacity for more simultaneous users, or higher level spectral efficiency, when compared to the 4G networks. Radio resource and interference management will be a key research challenge in multi-tier and heterogeneous 5G cellular networks. The traditional methods for radio resource and interference management (e.g., channel allocation, power control, cell association or load balancing) in single-tier networks (even some of those developed for two-tier networks) may not be efficient in this environment and a new look into the interference management problem will be required.First, the article outlines the visions and requirements of 5G cellular wireless systems. Major research challenges are then highlighted from the perspective of interference management when the different network tiers share the same radio spectrum. A comparative analysis of the existing approaches for distributed cell association and power control (CAPC) is then provided followed by a discussion on their limitations for5G multi-tier cellular networks. Finally, a number of suggestions are provided to modifythe existing CAPC schemes to overcome these limitations.II. VISIONS AND REQUIREMENTS FOR 5G MULTI-TIERCELLULAR NETWORKS5G mobile and wireless communication systems will require a mix of new system concepts to boost the spectral and energy efficiency. The visions and requirements for 5G wireless systems are outlined below.·Data rate and latency: For dense urban areas, 5G networks are envisioned to enable an experienced data rate of 300 Mbps and 60 Mbps in downlink and uplink, respectively, in 95% of locations and time [2]. The end-to- end latencies are expected to be in the order of 2 to 5 milliseconds. The detailed requirements for different scenarios are listed in [2].·Machine-type Communication (MTC) devices: The number of traditional human-centric wireless devices with Internet connectivity (e.g., smart phones, super-phones, tablets) may be outnumbered by MTC devices which can be used in vehicles, home appliances, surveillance devices, and sensors.·Millimeter-wave communication: To satisfy the exponential increase in traffic and the addition of different devices and services, additional spectrum beyond what was previously allocated to 4G standard is sought for. The use of millimeter-wave frequency bands (e.g., 28 GHz and 38 GHz bands) is a potential candidate to overcome the problem of scarce spectrum resources since it allows transmission at wider bandwidths than conventional 20 MHz channels for 4G systems.·Multiple RATs: 5G is not about replacing the existing technologies, but it is about enhancing and supporting them with new technologies [1]. In 5G systems, the existing RATs, including GSM (Global System for Mobile Communications), HSPA+ (Evolved High-Speed Packet Access), and LTE, will continue to evolve to provide a superior system performance. They will also be accompanied by some new technologies (e.g., beyondLTE-Advanced).·Base station (BS) densification: BS densification is an effective methodology to meet the requirements of 5G wireless networks. Specifically, in 5G networks, there will be deployments of a large number of low power nodes, relays, and device-to-device (D2D) communication links with much higher density than today’s macrocell networks.Fig. 1 shows such a multi-tier network with a macrocell overlaid by relays, picocells, femtocells, and D2D links. The adoption of multiple tiers in the cellular networkarchitecture will result in better performance in terms of capacity, coverage, spectral efficiency, and total power consumption, provided that the inter-tier and intratier interferences are well managed.·Prioritized spectrum access: The notions of both trafficbased and tier-based Prioriti -es will exist in 5G networks. Traffic-based priority arises from the different requirements of the users (e.g., reliability and latency requirements, energy constraints), whereas the tier-based priority is for users belonging to different network tiers. For example, with shared spectrum access among macrocells and femtocells in a two-tier network, femtocells create ―dead zones‖ around them in the downlink for macro users. Protection should, thus, be guaranteed for the macro users. Consequently, the macro and femtousers play the role of high-priority users (HPUEs) and lowpriority users (LPUEs), respectively. In the uplink direction, the macrocell users at the cell edge typically transmit with high powers which generates high uplink interference to nearby femtocells. Therefore, in this case, the user priorities should get reversed. Another example is a D2D transmission where different devices may opportunistically access the spectrum to establish a communication link between them provided that the interference introduced to the cellular users remains below a given threshold. In this case, the D2D users play the role of LPUEs whereas the cellular users play the role of HPUEs.·Network-assisted D2D communication: In the LTE Rel- 12 and beyond, focus will be on network controlled D2D communications, where the macrocell BS performs control signaling in terms of synchronization, beacon signal configuration and providing identity and security management [3]. This feature will extend in 5G networks to allow other nodes, rather than the macrocell BS, to have the control. For example, consider a D2D link at the cell edge and the direct link between the D2D transmitter UE to the macrocell is in deep fade, then the relay node can be responsible for the control signaling of the D2Dlink (i.e., relay-aided D2D communication).·Energy harvesting for energy-efficient communication: One of the main challenges in 5G wireless networks is to improve the energy efficiency of the battery-constrained wireless devices. To prolong the battery lifetime as well as to improve the energy efficiency, an appealing solution is to harvest energy from environmental energy sources (e.g., solar and wind energy). Also, energy can be harvested from ambient radio signals (i.e., RF energy harvesting) with reasonable efficiency over small distances. The havested energy could be used for D2D communication or communication within a small cell. Inthis context, simultaneous wireless information and power transfer (SWIPT) is a promising technology for 5G wireless networks. However, practical circuits for harvesting energy are not yet available since the conventional receiver architecture is designed for information transfer only and, thus, may not be optimal for SWIPT. This is due to the fact that both information and power transfer operate with different power sensitivities at the receiver (e.g., -10dBm and -60dBm for energy and information receivers, respectively) [4]. Also, due to the potentially low efficiency of energy harvesting from ambient radio signals, a combination of different energy harvesting technologies may be required for macrocell communication.III. INTERFERENCE MANAGEMENT CHALLENGES IN 5GMULTI-TIER NETWORKSThe key challenges for interference management in 5G multi-tier networks will arise due to the following reasons which affect the interference dynamics in the uplink and downlink of the network: (i) heterogeneity and dense deployment of wireless devices, (ii) coverage and traffic load imbalance due to varying transmit powers of different BSs in the downlink, (iii) public or private access restrictions in different tiers that lead to diverse interference levels, and (iv) the priorities in accessing channels of different frequencies and resource allocation strategies. Moreover, the introduction of carrier aggregation, cooperation among BSs (e.g., by using coordinated multi-point transmission (CoMP)) as well as direct communication among users (e.g., D2D communication) may further complicate the dynamics of the interference. The above factors translate into the following key challenges.·Designing optimized cell association and power control (CAPC) methods for multi-tier networks: Optimizing the cell associations and transmit powers of users in the uplink or the transmit powers of BSs in the downlink are classical techniques to simultaneously enhance the system performance in various aspects such as interference mitigation, throughput maximization, and reduction in power consumption. Typically, the former is needed to maximize spectral efficiency, whereas the latter is required to minimize the power (and hence minimize the interference to other links) while keeping theFig. 1. A multi-tier network composed of macrocells, picocells, femtocells, relays, and D2D links.Arrows indicate wireless links, whereas the dashed lines denote the backhaul connections. desired link quality. Since it is not efficient to connect to a congested BS despite its high achieved signal-to-interference ratio (SIR), cell association should also consider the status of each BS (load) and the channel state of each UE. The increase in the number of available BSs along with multi-point transmissions and carrier aggregation provide multiple degrees of freedom for resource allocation and cell-selection strategies. For power control, the priority of different tiers need also be maintained by incorporating the quality constraints of HPUEs. Unlike downlink, the transmission power in the uplink depends on the user’s batt ery power irrespective of the type of BS with which users are connected. The battery power does not vary significantly from user to user; therefore, the problems of coverage and traffic load imbalance may not exist in the uplink. This leads to considerable asymmetries between the uplink and downlink user association policies. Consequently, the optimal solutions for downlink CAPC problems may not be optimal for the uplink. It is therefore necessary to develop joint optimization frameworks that can provide near-optimal, if not optimal, solutions for both uplink and downlink. Moreover, to deal with this issue of asymmetry, separate uplink and downlink optimal solutions are also useful as far as mobile users can connect with two different BSs for uplink and downlink transmissions which is expected to be the case in 5G multi-tier cellular networks [3].·Designing efficient methods to support simultaneous association to multiple BSs: Compared to existing CAPC schemes in which each user can associate to a singleBS, simultaneous connectivity to several BSs could be possible in 5G multi-tier network. This would enhance the system throughput and reduce the outage ratio by effectively utilizing the available resources, particularly for cell edge users. Thus the existing CAPCschemes should be extended to efficiently support simultaneous association of a user to multiple BSs and determine under which conditions a given UE is associated to which BSs in the uplink and/or downlink.·Designing efficient methods for cooperation and coordination among multiple tiers: Cooperation and coordination among different tiers will be a key requirement to mitigate interference in 5G networks. Cooperation between the macrocell and small cells was proposed for LTE Rel-12 in the context of soft cell, where the UEs are allowed to have dual connectivity by simultaneously connecting to the macrocell and the small cell for uplink and downlink communications or vice versa [3]. As has been mentioned before in the context of asymmetry of transmission power in uplink and downlink, a UE may experience the highest downlink power transmission from the macrocell, whereas the highest uplink path gain may be from a nearby small cell. In this case, the UE can associate to the macrocell in the downlink and to the small cell in the uplink. CoMP schemes based on cooperation among BSs in different tiers (e.g., cooperation between macrocells and small cells) can be developed to mitigate interference in the network. Such schemes need to be adaptive and consider user locations as well as channel conditions to maximize the spectral and energy efficiency of the network. This cooperation however, requires tight integration of low power nodes into the network through the use of reliable, fast andlow latency backhaul connections which will be a major technical issue for upcoming multi-tier 5G networks. In the remaining of this article, we will focus on the review of existing power control and cell association strategies to demonstrate their limitations for interference management in 5G multi-tier prioritized cellular networks (i.e., where users in different tiers have different priorities depending on the location, application requirements and so on). Design guidelines will then be provided to overcome these limitations. Note that issues such as channel scheduling in frequency domain, timedomain interference coordination techniques (e.g., based on almost blank subframes), coordinated multi-point transmission, and spatial domain techniques (e.g., based on smart antenna techniques) are not considered in this article.IV. DISTRIBUTED CELL ASSOCIATION AND POWERCONTROL SCHEMES: CURRENT STATE OF THE ARTA. Distributed Cell Association SchemesThe state-of-the-art cell association schemes that are currently under investigation formulti-tier cellular networks are reviewed and their limitations are explained below.·Reference Signal Received Power (RSRP)-based scheme [5]: A user is associated with the BS whose signal is received with the largest average strength. A variant of RSRP, i.e., Reference Signal Received Quality (RSRQ) is also used for cell selection in LTE single-tier networks which is similar to the signal-to-interference (SIR)-based cell selection where a user selects a BS communicating with which gives the highest SIR. In single-tier networks with uniform traffic, such a criterion may maximize the network throughput. However, due to varying transmit powers of different BSs in the downlink of multi-tier networks, such cell association policies can create a huge traffic load imbalance. This phenomenon leads to overloading of high power tiers while leaving low power tiers underutilized.·Bias-based Cell Range Expansion (CRE) [6]: The idea of CRE has been emerged as a remedy to the problem of load imbalance in the downlink. It aims to increase the downlink coverage footprint of low power BSs by adding a positive bias to their signal strengths (i.e., RSRP or RSRQ). Such BSs are referred to as biased BSs. This biasing allows more users to associate with low power or biased BSs and thereby achieve a better cell load balancing. Nevertheless, such off-loaded users may experience unfavorable channel from the biased BSs and strong interference from the unbiased high-power BSs. The trade-off between cell load balancing and system throughput therefore strictly depends on the selected bias values which need to be optimized in order to maximize the system utility. In this context, a baseline approach in LTE-Advanced is to ―orthogonalize‖ the transmissions of the biased and unbiased BSs in time/frequency domain such that an interference-free zone is created.·Association based on Almost Blank Sub-frame (ABS) ratio [7]: The ABS technique uses time domain orthogonalization in which specific sub-frames are left blank by the unbiased BS and off-loaded users are scheduled within these sub-frames to avoid inter-tier interference. This improves the overall throughput of the off-loaded users by sacrificing the time sub-frames and throughput of the unbiased BS. The larger bias values result in higher degree of offloading and thus require more blank subframes to protect the offloaded users. Given a specific number of ABSs or the ratio of blank over total number of sub-frames (i.e., ABS ratio) that ensures the minimum throughput of the unbiased BSs, this criterion allows a user to select a cell with maximum ABS ratio and may even associate with the unbiased BS if ABS ratio decreases significantly. A qualitative comparison amongthese cell association schemes is given in Table I. The specific key terms used in Table I are defined as follows: channel-aware schemes depend on the knowledge of instantaneous channel and transmit power at the receiver. The interference-aware schemes depend on the knowledge of instantaneous interference at the receiver. The load-aware schemes depend on the traffic load information (e.g., number of users). The resource-aware schemes require the resource allocation information (i.e., the chance of getting a channel or the proportion of resources available in a cell). The priority-aware schemes require the information regarding the priority of different tiers and allow a protection to HPUEs. All of the above mentioned schemes are independent, distributed, and can be incorporated with any type of power control scheme. Although simple and tractable, the standard cell association schemes, i.e., RSRP, RSRQ, and CRE are unable to guarantee the optimum performance in multi-tier networks unless critical parameters, such as bias values, transmit power of the users in the uplink and BSs in the downlink, resource partitioning, etc. are optimized.B. Distributed Power Control SchemesFrom a user’s point of view, the objective of power control is to support a user with its minimum acceptable throughput, whereas from a system’s point of view it is t o maximize the aggregate throughput. In the former case, it is required to compensate for the near-far effect by allocating higher power levels to users with poor channels as compared to UEs with good channels. In the latter case, high power levels are allocated to users with best channels and very low (even zero) power levels are allocated to others. The aggregate transmit power, the outage ratio, and the aggregate throughput (i.e., the sum of achievable rates by the UEs) are the most important measures to compare the performance of different power control schemes. The outage ratio of a particular tier can be expressed as the ratio of the number of UEs supported by a tier with their minimum target SIRs and the total number of UEs in that tier. Numerous power control schemes have been proposed in the literature for single-tier cellular wireless networks. According to the corresponding objective functions and assumptions, the schemes can be classified into the following four types.·Target-SIR-tracking power control (TPC) [8]: In the TPC, each UE tracks its own predefined fixed target-SIR. The TPC enables the UEs to achieve their fixed target-TABLE IQUALITATIVE COMPARISON OF EXISTING CELL ASSOCIATION SCHEMESFOR MULTI-TIER NETWORKSSIRs at minimal aggregate transmit power, assuming thatthe target-SIRs are feasible. However, when the system is infeasible, all non-supported UEs (those who cannot obtain their target-SIRs) transmit at their maximum power, which causes unnecessary power consumption and interference to other users, and therefore, increases the number of non-supported UEs.·TPC with gradual removal (TPC-GR) [9], [10], and [11]:To decrease the outage ra -tio of the TPC in an infeasiblesystem, a number of TPC-GR algorithms were proposedin which non-supported users reduce their transmit power[10] or are gradually removed [9], [11].·Opportunistic power control (OPC) [12]: From the system’s point of view, OPC allocates high power levels to users with good channels (experiencing high path-gains and low interference levels) and very low power to users with poor channels. In this algorithm, a small difference in path-gains between two users may lead to a large difference in their actual throughputs [12]. OPC improves the system performance at the cost of reduced fairness among users.·Dynamic-SIR tracking power control (DTPC) [13]: When the target-SIR requirements for users are feasible, TPC causes users to exactly hit their fixed target-SIRs even if additional resources are still available that can otherwise be used to achieve higher SIRs (and thus better throughputs). Besides, the fixed-target-SIR assignment is suitable only for voice service for which reaching a SIR value higher than the given target value does not affect the service quality significantly. In contrast, for data services, a higher SIR results in a better throughput, which is desirable. The DTPC algorithm was proposed in [13] to address the problem of system throughput maximization subject to a given feasible lower bound for the achieved SIRs of all users in cellular networks. In DTPC, each user dynamically sets its target-SIR by using TPC and OPC in a selective manner. It was shown that when the minimum acceptable target-SIRs are feasible, the actual SIRs received by some users can be dynamically increased (to a value higher than their minimum acceptabletarget-SIRs) in a distributed manner so far as the required resources are available and the system remains feasible (meaning that reaching the minimum target-SIRs for the remaining users are guaranteed). This enhances the system throughput (at the cost of higher power consumption) as compared to TPC. The aforementioned state-of-the-art distributed power control schemes for satisfying various objectives in single-tier wireless cellular networks are unable to address the interference management problem in prioritized 5G multi-tier networks. This is due to the fact that they do not guarantee that the total interference caused by the LPUEs to the HPUEs remain within tolerable limits, which can lead to the SIR outage of some HPUEs. Thus there is a need to modify the existing schemes such that LPUEs track their objectives while limiting their transmit power to maintain a given interference threshold at HPUEs. A qualitative comparison among various state-of-the-art power control problems with different objectives and constraints and their corresponding existing distributed solutions are shown in Table II. This table also shows how these schemes can be modified and generalized for designing CAPC schemes for prioritized 5G multi-tier networks.C. Joint Cell Association and Power Control SchemesA very few work in the literature have considered the problem of distributed CAPC jointly (e.g., [14]) with guaranteed convergence. For single-tier networks, a distributed framework for uplink was developed [14], which performs cell selection based on the effective-interference (ratio of instantaneous interference to channel gain) at the BSs and minimizes the aggregate uplink transmit power while attaining users’ desire d SIR targets. Following this approach, a unified distributed algorithm was designed in [15] for two-tier networks. The cell association is based on the effective-interference metric and is integrated with a hybrid power control (HPC) scheme which is a combination of TPC and OPC power control algorithms.Although the above frameworks are distributed and optimal/ suboptimal with guaranteed convergence in conventional networks, they may not be directly compatible to the 5G multi-tier networks. The interference dynamics in multi-tier networks depends significantly on the channel access protocols (or scheduling), QoS requirements and priorities at different tiers. Thus, the existing CAPC optimization problems should be modified to include various types of cell selection methods (some examples are provided in Table I) and power control methods with different objectives and interference constraints (e.g., interference constraints for macro cell UEs, picocell UEs, or D2Dreceiver UEs). A qualitative comparison among the existing CAPC schemes along with the open research areas are highlighted in Table II. A discussion on how these open problems can be addressed is provided in the next section.V. DESIGN GUIDELINES FOR DISTRIBUTED CAPCSCHEMES IN 5G MULTI-TIER NETWORKSInterference management in 5G networks requires efficient distributed CAPC schemes such that each user can possibly connect simultaneously to multiple BSs (can be different for uplink and downlink), while achieving load balancing in different cells and guaranteeing interference protection for the HPUEs. In what follows, we provide a number of suggestions to modify the existing schemes.A. Prioritized Power ControlTo guarantee interference protection for HPUEs, a possible strategy is to modify the existing power control schemes listed in the first column of Table II such that the LPUEs limit their transmit power to keep the interference caused to the HPUEs below a predefined threshold, while tracking their own objectives. In other words, as long as the HPUEs are protected against existence of LPUEs, the LPUEs could employ an existing distributed power control algorithm to satisfy a predefined goal. This offers some fruitful direction for future research and investigation as stated in Table II. To address these open problems in a distributed manner, the existing schemes should be modified so that the LPUEs in addition to setting their transmit power for tracking their objectives, limit their transmit power to keep their interference on receivers of HPUEs below a given threshold. This could be implemented by sending a command from HPUEs to its nearby LPUEs (like a closed-loop power control command used to address the near-far problem), when the interference caused by the LPUEs to the HPUEs exceeds a given threshold. We refer to this type of power control as prioritized power control. Note that the notion of priority and thus the need of prioritized power control exists implicitly in different scenarios of 5G networks, as briefly discussed in Section II. Along this line, some modified power control optimization problems are formulated for 5G multi-tier networks in second column of Table II.To compare the performance of existing distributed power control algorithms, let us consider a prioritized multi-tier cellular wireless network where a high-priority tier consisting of 3×3 macro cells, each of which covers an area of 1000 m×1000 m, coexists with a low-priority tier consisting of n small-cells per each high-priority macro cell, each。

外文参考文献译文及原文【范本模板】

外文参考文献译文及原文【范本模板】

广东工业大学华立学院本科毕业设计（论文）外文参考文献译文及原文系部城建学部专业土木工程年级 2011级班级名称 11土木工程9班学号 23031109000学生姓名刘林指导教师卢集富2015 年5 月目录一、项目成本管理与控制 0二、Project Budget Monitor and Control (1)三、施工阶段承包商在控制施工成本方面所扮演的作用 (2)四、The Contractor’s Role in Building Cost Reduction After Design (4)一、外文文献译文（1）项目成本管理与控制随着市场竞争的激烈性越来越大,在每一个项目中，进行成本控制越发重要。

本文论述了在施工阶段,项目经理如何成功地控制项目预算成本。

本文讨论了很多方法。

它表明，要取得成功，项目经理必须关注这些成功的方法.1。

简介调查显示,大多数项目会碰到超出预算的问……功控制预算成本.2.项目控制和监测的概念和目的Erel and Raz (2000）指出项目控制周期包括测量成……原因以及决定纠偏措施并采取行动。

监控的目的就是纠偏措施的。

.。

标范围内。

3.建立一个有效的控制体系为了实现预算成本的目标，项目管理者需要建立一……被监测和控制是非常有帮助的。

项目成功与良好的沟通密。

决（ Diallo and Thuillier， 2005）.4.成本费用的检测和控制4.1对检测的优先顺序进行排序在施工阶段，很多施工活动是基于原来的计……用完了。

第四,项目管理者应该检测高风险活动，高风险活动最有。

..重要（Cotterell and Hughes, 1995)。

4.2成本控制的方法一个项目的主要费用包括员工成本、材料成本以及工期延误的成本。

为了控制这些成本费用，项目管理者首先应该建立一个成本控制系统：a)为财务数据的管理和分析工作落实责任人员b)确保按照项目的结构来合理分配所有的……它的变化-—在成本控制线上准确地记录所有恰..。

外文文献翻译(图片版)

外文文献翻译(图片版)

本科毕业论文外文参考文献译文及原文学院经济与贸易学院专业经济学（贸易方向）年级班别2007级 1 班学号3207004154学生姓名欧阳倩指导教师童雪晖2010 年 6 月 3 日目录1 外文文献译文（一）中国银行业的改革和盈利能力（第1、2、4部分） (1)2 外文文献原文（一）CHINA’S BANKING REFORM AND PROFITABILITY（Part 1、2、4） (9)1概述世界银行（1997年）曾声称，中国的金融业是其经济的软肋。

当一国的经济增长的可持续性岌岌可危的时候，金融业的改革一直被认为是提高资金使用效率和消费型经济增长重新走向平衡的必要（Lardy，1998年，Prasad，2007年）。

事实上，不久前，中国的国有银行被视为“技术上破产”，它们的生存需要依靠充裕的国家流动资金。

但是，在银行改革开展以来，最近，强劲的盈利能力已恢复到国有商业银行的水平。

但自从中国的国有银行在不久之前已经走上了改革的道路，它可能过早宣布银行业的改革尚未取得完全的胜利。

此外，其坚实的财务表现虽然强劲，但不可持续增长。

随着经济增长在2008年全球经济衰退得带动下已经开始软化，银行预计将在一个比以前更加困难的经济形势下探索。

本文的目的不是要评价银行业改革对银行业绩的影响，这在一个完整的信贷周期后更好解决。

相反，我们的目标是通过审查改革的进展和银行改革战略，并分析其近期改革后的强劲的财务表现，但是这不能完全从迄今所进行的改革努力分离。

本文有三个部分。

在第二节中，我们回顾了中国的大型国有银行改革的战略，以及其执行情况，这是中国银行业改革的主要目标。

第三节中分析了2007年的财务表现集中在那些在市场上拥有浮动股份的四大国有商业银行：中国工商银行（工商银行），中国建设银行（建行），对中国银行（中银）和交通银行（交通银行）。

引人注目的是中国农业银行，它仍然处于重组上市过程中得适当时候的后期。

第四节总结一个对银行绩效评估。

外文原文及译文

外文原文及译文

外文原文及译文一、外文原文Subject：Financial Analysis with the DuPont Ratio: A UsefulCompassDerivation：Steven C. Isberg, Ph.D.Financial Analysis and the Changing Role of Credit ProfessionalsIn today's dynamic business environment, it is important for credit professionals to be prepared to apply their skills both within and outside the specific credit management function. Credit executives may be called upon to provide insights regarding issues such as strategic financial planning, measuring the success of a business strategy or determining the viability of an acquisition candidate. Even so, the normal duties involved in credit assessment and management call for the credit manager to be equipped to conduct financial analysis in a rapid and meaningful way.Financial statement analysis is employed for a variety of reasons. Outside investors are seeking information as to the long run viability of a business and its prospects for providing an adequate return in consideration of the risks being taken. Creditors desire to know whether a potential borrower or customer can service loans being made. Internal analysts and management utilize financial statement analysis as a means to monitor the outcome of policy decisions, predict future performance targets, develop investment strategies, and assess capital needs. As the role of the credit manager is expanded cross-functionally, he or she may be required to answer the call to conduct financial statement analysis under any of these circumstances. The DuPont ratio is a useful tool in providing both an overview and a focus for such analysis.A comprehensive financial statement analysis will provide insights as to a firm's performance and/or standing in the areas of liquidity, leverage, operating efficiency and profitability. A complete analysis will involve both time series and cross-sectional perspectives. Time series analysis will examine trends using the firm's own performance as a benchmark. Cross sectional analysis will augment the process by using external performance benchmarks for comparison purposes. Every meaningful analysis will begin with a qualitative inquiry as to the strategy and policies of the subject company, creating a context for the investigation. Next, goals and objectives of the analysis will be established, providing a basis for interpreting the results. The DuPont ratio can be used as a compass in this process by directing the analyst toward significant areas of strength and weakness evident in the financial statements.The DuPont ratio is calculated as follows:ROE = (Net Income/Sales) X (Sales/Average Assets) X (Average Assets/Avenge Equity)The ratio provides measures in three of the four key areas of analysis, eachrepresenting a compass bearing, pointing the way to the next stage of the investigation.The DuPont Ratio DecompositionThe DuPont ratio is a good place to begin a financial statement analysis because it measures the return on equity (ROE). A for-profit business exists to create wealth for its owner(s). ROE is, therefore, arguably the most important of the key ratios, since it indicates the rate at which owner wealth is increasing. While the DuPont analysis is not an adequate replacement for detailed financial analysis, it provides an excellent snapshot and starting point, as will be seen below.The three components of the DuPont ratio, as represented in equation, cover the areas of profitability, operating efficiency and leverage. In the following paragraphs, we examine the meaning of each of these components by calculating and comparing the DuPont ratio using the financial statements and industry standards for Atlantic Aquatic Equipment, Inc. (Exhibits 1, 2, and 3), a retailer of water sporting goods.Profitability: Net Profit Margin (NPM: Net Income/Sales)Profitability ratios measure the rate at which either sales or capital is converted into profits at different levels of the operation. The most common are gross, operating and net profitability, which describe performance at different activity levels. Of the three, net profitability is the most comprehensive since it uses the bottom line net income in its measure.A proper analysis of this ratio would include at least three to five years of trend and cross-sectional comparison data. The cross sectional comparison can be drawn from a variety of sources. Most common are the Dun & Bradstreet Index of Key Financial Ratios and the Robert Morris Associates (RMA) Annual Statement Studies. Each of these volumes provide key ratios estimated for business establishments grouped according to industry (i.e., SIC codes). More will be discussed in regard to comparisons as our example is continued below. As is, over the two years, Whitbread has become less profitable.Leverage: The Leverage Multiplier (Average Assets/Average Equity)Leverage ratios measure the extent to which a company relies on debt financing in its capital structure. Debt is both beneficial and costly to a firm. The cost of debt is lower thanthe cost of equity, an effect which is enhanced by the tax deductibility of interest payments in contrast to taxable dividend payments and stock repurchases. If debt proceeds are invested in projects which return more than the cost of debt, owners keep the residual, and hence, the return on equity is "leveraged up." The debt sword, however, cuts both ways. Adding debt creates a fixed payment required of the firm whether or not it is earning an operating profit, and therefore, payments may cut into the equity base. Further, the risk of the equity position is increased by the presence of debt holders having a superior claim to the assets of the firm.二、译文题目：杜邦分析体系出处：史蒂文c Isberg运输研究所硕士论文杜邦分析体系财务分析与专业信用人员的角色转变在当今动态商业环境中，信贷的专业人士申请内部外部的特定信贷管理职能的技能非常重要。

毕业设计(论文)外文原文及译文

毕业设计(论文)外文原文及译文

毕业设计（论文）外文原文及译文一、外文原文MCUA microcontroller (or MCU) is a computer-on-a-chip. It is a type of microcontroller emphasizing self-sufficiency and cost-effectiveness, in contrast to a general-purpose microprocessor (the kind used in a PC).With the development of technology and control systems in a wide range of applications, as well as equipment to small and intelligent development, as one of the single-chip high-tech for its small size, powerful, low cost, and other advantages of the use of flexible, show a strong vitality. It is generally better compared to the integrated circuit of anti-interference ability, the environmental temperature and humidity have better adaptability, can be stable under the conditions in the industrial. And single-chip widely used in a variety of instruments and meters, so that intelligent instrumentation and improves their measurement speed and measurement accuracy, to strengthen control functions. In short，with the advent of the information age, traditional single- chip inherent structural weaknesses, so that it show a lot of drawbacks. The speed, scale, performance indicators, such as users increasingly difficult to meet the needs of the development of single-chip chipset, upgrades are faced with new challenges.The Description of AT89S52The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.The AT89S52 provides the following standard features: 8K bytes ofFlash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset.Features• Compatible with MCS-51® Products• 8K Bytes of In-System Programmable (ISP) Flash Memory– Endurance: 1000 Write/Erase Cycles• 4.0V to 5.5V Operating Range• Fully Static Operation: 0 Hz to 33 MHz• Three-level Program Memory Lock• 256 x 8-bit Internal RAM• 32 Programmable I/O Lines• Three 16-bit Timer/Counters• Eight Interrupt Sources• Full Duplex UART Serial Channel• Low-power Idle and Power-down Modes• Interrupt Recovery from Power-down Mode• Watchdog Timer• Dual Data Pointer• Power-off FlagPin DescriptionVCCSupply voltage.GNDGround.Port 0Port 0 is an 8-bit open drain bidirectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs.Port 0 can also be configured to be the multiplexed low-order address/data bus during accesses to external program and data memory. In this mode, P0 has internal pullups.Port 0 also receives the code bytes during Flash programming and outputs the code bytes during program verification. External pullups are required during program verification.Port 1Port 1 is an 8-bit bidirectional I/O port with internal pullups. The Port 1 output buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current (IIL) because of the internal pullups.In addition, P1.0 and P1.1 can be configured to be the timer/counter 2 external count input (P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively.Port 1 also receives the low-order address bytes during Flash programming and verification.Port 2Port 2 is an 8-bit bidirectional I/O port with internal pullups. The Port 2 output buffers can sink/source four TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low will source current (IIL) because of the internal pullups.Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @ DPTR). In this application, Port 2 uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special Function Register.Port 2 also receives the high-order address bits and some control signals during Flash programming and verification.Port 3Port 3 is an 8-bit bidirectional I/O port with internal pullups. The Port 3 output buffers can sink/source four TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pullups.Port 3 also serves the functions of various special features of the AT89S52, as shown in the following table.Port 3 also receives some control signals for Flash programming and verification.RSTReset input. A high on this pin for two machine cycles while the oscillator is running resets the device. This pin drives High for 96 oscillator periods after the Watchdog times out. The DISRTO bit in SFR AUXR (address 8EH) can be used to disable this feature. In the default state of bit DISRTO, the RESET HIGH out feature is enabled.ALE/PROGAddress Latch Enable (ALE) is an output pulse for latching the low byte of the address during accesses to external memory. This pin is also the program pulse input (PROG) during Flash programming.In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency and may be used for external timing or clocking purposes. Note, however, that one ALE pulse is skipped during each access to external data memory.If desired, ALE operation can be disabled by setting bit 0 of SFR location 8EH. With the bit set, ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.PSENProgram Store Enable (PSEN) is the read strobe to external program memory. When the AT89S52 is executing code from external program memory, PSENis activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory.EA/VPPExternal Access Enable. EA must be strapped to GND in order to enable the device to fetch code from external program memory locations starting at 0000H up to FFFFH. Note, however, that if lock bit 1 is programmed, EA will be internally latched on reset. EA should be strapped to VCC for internal program executions.This pin also receives the 12-volt programming enable voltage (VPP) during Flash programming.XTAL1Input to the inverting oscillator amplifier and input to the internal clock operating circuit.XTAL2Output from the inverting oscillator amplifier.Special Function RegistersNote that not all of the addresses are occupied, and unoccupied addresses may not be implemented on the chip. Read accesses to these addresses will in general return random data, and write accesses will have an indeterminate effect.User software should not write 1s to these unlisted locations, since they may be used in future products to invoke new features. In that case, the reset or inactive values of the new bits will always be 0.Timer 2 Registers:Control and status bits are contained in registers T2CON and T2MOD for Timer 2. The register pair (RCAP2H, RCAP2L) are the Capture/Reload registers for Timer 2 in 16-bit capture mode or 16-bit auto-reload mode.Interrupt Registers:The individual interrupt enable bits are in the IE register. Two priorities can be set for each of the six interrupt sources in the IP register.Dual Data Pointer Registers: To facilitate accessing both internal and external data memory, two banks of 16-bit Data Pointer Registers areprovided: DP0 at SFR address locations 82H-83H and DP1 at 84H-85H. Bit DPS = 0 in SFR AUXR1 selects DP0 and DPS = 1 selects DP1. The user should always initialize the DPS bit to the appropriate value before accessing the respective Data Pointer Register.Power Off Flag:The Power Off Flag (POF) is located at bit 4 (PCON.4) in the PCON SFR. POF is set to “1” during power up. It can be set and rest under software control and is not affected by reset.Memory OrganizationMCS-51 devices have a separate address space for Program and Data Memory. Up to 64K bytes each of external Program and Data Memory can be addressed.Program MemoryIf the EA pin is connected to GND, all program fetches are directed to external memory. On the AT89S52, if EA is connected to VCC, program fetches to addresses 0000H through 1FFFH are directed to internal memory and fetches to addresses 2000H through FFFFH are to external memory.Data MemoryThe AT89S52 implements 256 bytes of on-chip RAM. The upper 128 bytes occupy a parallel address space to the Special Function Registers. This means that the upper 128 bytes have the same addresses as the SFR space but are physically separate from SFR space.When an instruction accesses an internal location above address 7FH, the address mode used in the instruction specifies whether the CPU accesses the upper 128 bytes of RAM or the SFR space. Instructions which use direct addressing access of the SFR space. For example, the following direct addressing instruction accesses the SFR at location 0A0H (which is P2).MOV 0A0H, #dataInstructions that use indirect addressing access the upper 128 bytes of RAM. For example, the following indirect addressing instruction, where R0 contains 0A0H, accesses the data byte at address 0A0H, rather than P2 (whose address is 0A0H).MOV @R0, #dataNote that stack operations are examples of indirect addressing, so the upper 128 bytes of data RAM are available as stack space.Timer 0 and 1Timer 0 and Timer 1 in the AT89S52 operate the same way as Timer 0 and Timer 1 in the AT89C51 and AT89C52.Timer 2Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter. The type of operation is selected by bit C/T2 in the SFR T2CON (shown in Table 2). Timer 2 has three operating modes: capture, auto-reload (up or down counting), and baud rate generator. The modes are selected by bits in T2CON.Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 register is incremented every machine cycle. Since a machine cycle consists of 12 oscillator periods, the count rate is 1/12 of the oscillator frequency.In the Counter function, the register is incremented in response to a1-to-0 transition at its corresponding external input pin, T2. In this function, the external input is sampled during S5P2 of every machine cycle. When the samples show a high in one cycle and a low in the next cycle, the count is incremented. The new count value appears in the register during S3P1 of the cycle following the one in which the transition was detected. Since two machine cycles (24 oscillator periods) are required to recognize a 1-to-0 transition, the maximum count rate is 1/24 of the oscillator frequency. To ensure that a given level is sampled at least once before it changes, the level should be held for at least one full machine cycle.InterruptsThe AT89S52 has a total of six interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. These interrupts are all shown in Figure 10.Each of these interrupt sources can be individually enabled or disabledby setting or clearing a bit in Special Function Register IE. IE also contains a global disable bit, EA, which disables all interrupts at once.Note that Table 5 shows that bit position IE.6 is unimplemented. In the AT89S52, bit position IE.5 is also unimplemented. User software should not write 1s to these bit positions, since they may be used in future AT89 products. Timer 2 interrupt is generated by the logical OR of bits TF2 and EXF2 in register T2CON. Neither of these flags is cleared by hardware when the service routine is vectored to. In fact, the service routine may have to determine whether it was TF2 or EXF2 that generated the interrupt, and that bit will have to be cleared in software.The Timer 0 and Timer 1 flags, TF0 and TF1, are set at S5P2 of the cycle in which the timers overflow. The values are then polled by the circuitry in the next cycle. However, the Timer 2 flag, TF2, is set at S2P2 and is polled in the same cycle in which the timer overflows.二、译文单片机单片机即微型计算机，是把中央处理器、存储器、定时/计数器、输入输出接口都集成在一块集成电路芯片上的微型计算机。

福建茶叶出口论文外文原文及译文

福建茶叶出口论文外文原文及译文

北京联合大学毕业论文外文原文及译文题目：福建省茶叶出口现状及对策研究专业：国际经济与贸易指导教师：学院：学号：班级：姓名：一、外文原文Current status and future development of global tea production and tea productsAlastair HicksFAO Regional Office for Asia and the PacificTea is globally one of the most popular and lowest cost beverages, next only to water. Tea is consumed by a wide range of age groups in all levels of society. More than three billion cups of tea are consumed daily worldwide. Tea is considered to be a part of the huge beverage market, not to be seen in isolation jus t as a ‘commodity’. Tea active ingredients are of interest to functional foods markets. Africa, South America, the Near East and especially the Asian region produces a varied range of teas, this, together with a reputation in the international markets for high quality, has resulted in Asia enjoying a share of every importing market in the world. Huge populations in Asia, Middle East, Africa, UK, EU, and countries of the CIS consume tea regularly and throughout the day. The main tea producing countries globally are: in Africa: Burundi, Kenya, Malawi, Rwanda, Tanzania, Uganda, Zimbabwe and others. In South America: Argentina, Brazil and others; In Near East: Iran and Turkey. In Asia: Bangladesh, China, India, Indonesia, Sri Lanka, Viet Nam and others. In addition, the Russian Federation and CIS countries produce quantities of tea. Numerous types of teas are produced in the countries listed above. In China, for example, the country with the largest planting of tea and second in output, green tea is around half of the total export, black tea around one third and other teas one fifth. Depending on the manufacturing technique it may be described as green, black, oolong, white, yellow and even compressed tea. The Intergovernmental Group on Tea monitors market conditions and provides an update of potential market prospects for tea over the medium term. which examines the current situation and medium term prospects for production, consumption and trade of tea, and its impact on the world tea market.In summary, tea is considered as having a share of the global beverage market, ahighly competitive field. A wide range of tea products continue to be developed, through product and process development for added-value, as market shares become more sophisticated and competitive. The tea industry must rise to these challenges, facing the future with confidence.IntroductionThe Asian region produces a varied range of teas and this, together with a reputation in the international markets for high quality, has resulted in Asia enjoying a share of every importing market in the world. Africa, South America and the Near East also produce quantities of tea. Huge populations of Asia, UK, EU, Middle East, Africa and countries of the CIS consume tea regularly and throughout the day .The common tea plant is the evergreen shrub, Camellia sinensis. There are several varieties of this species of plant, a well known one being the Indian Assam tea (C. sinensis var. assamica Kitamura). Traditionally, tea is prepared from its dried young leaves and leaf buds, made into a beverage by steeping the leaves in boiling water. China is credited with introducing tea to the world, though the evergreen tea plant is in fact native to Southern China, North India, Myanmar and Cambodia .Although there are a growing number of countries that produce teas in a multiplicity of blends, there are essentially three main types of Camellia tea, which are Green, ‘Oolong’ and Black. The difference lies in the ‘fermentation’, which actually refers to oxidative and enzymatic changes within the tea leaves, during processing. Green tea is essentially unfermented, Oolong tea is partially fermented and Black tea is fully fermented. Black tea, which represents the majority of international trade, yields an amber coloured, full-flavour liquid without bitterness .For example, both Orange Pekoe and Pekoe are black teas. refers to the silver-tipped Assam teas. Orange Pekoe is made from the very young top leaves and traditionally comes from India or Sri Lanka. Pekoe tea comes from India, Indonesia or Sri Lanka and is made from leaves even smaller than those characteristically used for Orange Pekoe.In addition to these conventional teas, many countries of Asia have a number of herbal teas, made from brewing plant leaves, or other plant parts including flowers. For example, Gymnema sylvestre, a member of the botanical family Asclepiadaceae, found mainly in India, has been used as a healthy and nutritive herbal tea which claims to have a number of medicinal properties. Numerous other herbal teas are gaining more popularity recently .Current SituationThe global tea production growth rate in 2006 was more than 3% to reach an estimated 3.6 million t.. The expansion was mainly due to record crops in China, Viet Nam and India. Production in China increased 9.5% over the record in 2005, to 1.05 million t. in 2006, through Government policies to increase rural household incomes. Expansion of 28 percent in Viet Nam gave an output of 133,000t as tea bushes reached optimum yields. India had a 3% increase in harvest output of 945,000t for the year. This growth offset other major countries, Kenya and Sri Lanka, where output declined by 6 and 1.6%, respectively.ExportsExports in 2006 reached 1.55 million t. compared to 1.53 million t. in 2005 (Table 2).Increased shipments from Sri Lanka, India and Viet Nam offset major declines in Kenya and Indonesia, down by 12.4 and 7%. Tea exports from Sri Lanka reached 314,900 in 2006, a gain of 5.4%, while exports from Viet Nam and India expanded by 24 and 14%. The increase was due to expansion in trade to the Near East, with their growth and strength of the economies in the region. Significant growth was also achieved by Rwanda, and Tanzania, while shipments from China were relatively unchanged. Decline in exports from Kenya were affected by political uncertainty in Pakistan, its major market. Pakistan’s uncertainty also affected shipments from Indonesia and Bangladesh where exports declined, and structural problems plague the industry (FAO 2008).ImportsWorld net imports of tea declined by 1.7% to 1.57 million t. in 2006 (Table 3), reflecting reduced tea imports by Pakistan, the Russian Federation, and the Netherlands. Increased imports by traditional markets such as the United Kingdom, United States, Egypt and Germany, did not offset these declines. Imports by Pakistan declined by 3%, Russian Federation by 2%, and Netherlands by 25%, imports increasing by 7% in United Kingdom, United States, and Egypt. In Germany a 9 percent increase was recorded.ConsumptionWorld tea consumption grew by 1% in 2006, reaching 3.64 million t., but less than the annual average of 2.7% over the previous decade (Table 4). The biggest influence has been the growth in agricultural products consumption, tea included, in China and India, as their economies expanded dramatically. In 2006, China recorded a spectacular annual increase of 13.6% in total consumption, which reached 776,900 t., whilst annual growth in tea consumption in India was less, it was higher than the previous decade. Income gains inIndia, China, other developing countries, translate to more demand, for higher value-added items.Tea Added Value Product and Process DevelopmentTraditional loose tea has been largely replaced by bagged tea in many forms, for convenience. There are a range of preferences for tea styles and drinking habits among different consumers in various countries . Green and black tea will remain as major forms of tea, however, instant tea, flavored tea, decaffeinated tea, organically grown tea,‘foamy’ tea, roasted tea, herbal tea, ready-to-drink tea (canned and bottled) are developing into the market. Food products being developed are tea-rice, tea-noodles, tea-cake, tea-biscuits, tea-wine, tea-candy, tea-ice cream. In particular new types of herbal, fruit-flavor and decaffeinated teas, as well as ready-to-drink teas are becoming popular. The organically grown and healthful image of tea can be exploited, as can the utilization of active-ingredients of tea as their functional properties and nature become better known.Ready-to-drink tea is cheaper than coca-cola derivatives and this is perceived as a main competitor. There is a risk that tea consumption may drop as other drinks come on the market, from e.g. rice, potatoes, mulberry leaves. Diversified products such as tea chewing gum have been developed (Hicks 2001).Some ConclusionsThe review of the world tea market indicates some improvement in the fundamental oversupply situation in the world market which has persisted in recent years. However, in the medium term, projections suggest that although supply will continue to outstrip demand, the gap could be closer to equilibrium, if consumption improves in traditional markets. Strategies must be devised to continue the improvement in demand. Opportunities for an expansion in consumption and improvement in prices exist in producing countries themselves, as per capita consumption levels are relatively low. E.g. per capita consumption level in the major importing countries, such as the Russian Federation is 1.26 kg and for the UK, is 2.20kg, whilst per capita consumption levels in India is 0.65 kg and for Kenya is 0.40 kg.The results of research into the health benefits of tea consumption should also be used more extensively in promoting consumption in both producing and importing countries. In addition, strategies to exploit demand in value-added market segments, including specialty and organic teas, should also be more aggressively pursued. In targeting potential growth markets, recognition of and compliance with food safety and quality standards is essential.Even the impact of imposing a minimum quality standard as a means of improving the quality of tea traded internationally, would by default, reduce the quantity of tea in the world market and improve prices, at least in the short to medium term (FAO 2008).In summary, tea can be considered as having a share of the soft drink/beverages market, as well as having functional food potential. A wide range of tea products will continue to be developed through product and process development for added-value as the market shares become more sophisticated and competitive. The industry must rise to these challenges and face the future with confidence (Hicks 2001).Article ID:/ducument/d11.pdf二、译文世界茶叶产业现状和未来发展茶是全球最受欢迎和最低成本的饮料之一,仅次于纯净水。

外文文献翻译译稿和原文【范本模板】

外文文献翻译译稿和原文【范本模板】

外文文献翻译译稿1卡尔曼滤波的一个典型实例是从一组有限的，包含噪声的，通过对物体位置的观察序列(可能有偏差）预测出物体的位置的坐标及速度。

在很多工程应用（如雷达、计算机视觉）中都可以找到它的身影。

同时，卡尔曼滤波也是控制理论以及控制系统工程中的一个重要课题。

例如，对于雷达来说，人们感兴趣的是其能够跟踪目标.但目标的位置、速度、加速度的测量值往往在任何时候都有噪声。

卡尔曼滤波利用目标的动态信息，设法去掉噪声的影响，得到一个关于目标位置的好的估计.这个估计可以是对当前目标位置的估计(滤波),也可以是对于将来位置的估计（预测），也可以是对过去位置的估计（插值或平滑).命名[编辑]这种滤波方法以它的发明者鲁道夫。

E。

卡尔曼(Rudolph E. Kalman）命名，但是根据文献可知实际上Peter Swerling在更早之前就提出了一种类似的算法。

斯坦利。

施密特（Stanley Schmidt)首次实现了卡尔曼滤波器。

卡尔曼在NASA埃姆斯研究中心访问时,发现他的方法对于解决阿波罗计划的轨道预测很有用，后来阿波罗飞船的导航电脑便使用了这种滤波器。

关于这种滤波器的论文由Swerling（1958）、Kalman (1960)与Kalman and Bucy（1961）发表。

目前,卡尔曼滤波已经有很多不同的实现.卡尔曼最初提出的形式现在一般称为简单卡尔曼滤波器。

除此以外，还有施密特扩展滤波器、信息滤波器以及很多Bierman, Thornton开发的平方根滤波器的变种.也许最常见的卡尔曼滤波器是锁相环，它在收音机、计算机和几乎任何视频或通讯设备中广泛存在。

以下的讨论需要线性代数以及概率论的一般知识。

卡尔曼滤波建立在线性代数和隐马尔可夫模型(hidden Markov model）上.其基本动态系统可以用一个马尔可夫链表示，该马尔可夫链建立在一个被高斯噪声（即正态分布的噪声）干扰的线性算子上的。

系统的状态可以用一个元素为实数的向量表示.随着离散时间的每一个增加，这个线性算子就会作用在当前状态上，产生一个新的状态,并也会带入一些噪声,同时系统的一些已知的控制器的控制信息也会被加入。

  1. 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
  2. 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
  3. 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

Problems and Solutions of Popularization ofAccounting NetworkKan Lu, YingLi Fu, CaiDong Gu, Liang ZhangPhysics Procedia 33 ( 2012 ) 1155–1159;1.IntroductionAccounting software in China are undergoing the transformation from the ex-post accounting-based accounting system to the integrated management information system. It has made great progress that accounting software developed from simple numerical calculation to comprehensive numerical accounting and even to the stage of accounting information system with artificial intelligence. There are more than 40 kinds of accounting software accredited by the Finance Ministry. The total number is more than 200,including software that are being used and accredited by financial sectors. And there have been a series of practical, efficient and highly commercialized accounting software.China's existing accounting Network is still at a low level, which is specifically embodied in:First, people's cognition of accounting Network is not enough. Second, professional skills of accounting Network staff need to be improved. Third, limitations of accounting software bound the development of Network undertaking in our country. Last, accounting Network cannot achieve the complete sharing of information resources. All these aspects have seriously hampered the popularization of accounting Network in our country.2.Problems of personnel2.1.People's cognitions of accounting Network are not enoughIn China, Network started fairly late and people were not fully aware of the meaning and the importance of it. The main reason of not being equipped with accounting Network, especially for those medium and small-sized enterprises, is not simply the shortage of funds. More importantly, it is because enterprise leaders are in lack of a correct cognition of accounting Network.In some underdeveloped areas of China, economic foundation is weak. Most enterprises have poor economic efficiency; administrative units and public institutions are short of expenditures; popularizing rate of hardware equipment is quite low. Consequently, the meaning and functions of accounting Network are not fully recognized by leaders or financial and accountancy personnel in some units. Instead, they mistakenly believe that accounting Network aims merely at lessening manual labours of accounting personnel. It is unnecessary to carry out accounting Network in units that have abundant accounting personnel. Some people think that accounting Network is just a development trend and they prefer to wait until some time later. Due to the bias of cognition, all these will lead to negative attitudes toward Network in accounting work, and finally seriously affect the development and the popularization of accounting Network.2.2.Low professional skill level of accounting Network personnel Computerization requires not only mastering professional skills of accounting for staff, but also having considerable professional skill of computer. However, the majority of accounting personnels are in temporary shortage. Older generations of accounting staff with proficient skills of accounting are not familiar with computer, yet new generations do not have enough practical experiences in dealing with increasingly complex accounting treatment. Although they can pass the accounting computerization qualification test, it is only a small fraction of content concerned with the test being mastered. Once encountering problems out of the range, they could do nothing but resolve together with software maintainers. However, most of those maintainers are only familiar with computer instead of accounting, so the two sides cannot coordinate well with each other. This also accounts for the restriction of popularization of accounting computerization.3.Problems of software and equipment3.1.Limitations of accounting software bound the development of computerization undertaking in our countryInstead of management, most software of accounting computerization focus on adjust accounting.Accounting computerization emancipates financial and accountancy personnels from onerouswork of casting and rendering accounts, and also enables them to focus mainly on strengtheningfinancial management.However, a majority of units in our country only attach importance to rendering accounts and neglect the management. There are so many accounting contents which involve accounting software, including general ledger, wage, fixed assets and report forms, that modules with managerial functions provided by accounting software developers, such as cost accounting, budgeting, analysing and others, are excessively simple in content design and incomplete in functions. Consequently, the managerial functions of Network are limited.At present, the universality of accounting software that are on the market is relatively poor. Most accounting Network software has heavy workload of system initialization and bulky volume. It is difficult for enterprises to choose the function according to their own needs. To solve this problem, suitable module can be selected from different software companies.Yet accountingsoftware of different companies is impossible to be seamlessly connected so that data exchanging,information sharing and management controlling cannot be carried out. What's more, they are hardly able to be combined with other managerial subsystems of enterprises like personnel system. Hence, it is difficult to form a whole management information system for enterprise.There is no guarantee of data security and confidentiality. For enterprises, financial data concern their survival and development. The so-called encryption of some software is merely the encryption of software itself which aims at preventing piracy. It is hardly to be kept secret for accounting data. Once problems of system come out like virus or other unexpected incidents, it's impossible to ensure no leakiness.3.2.Accounting Network cannot achieve the complete sharing of information resourcesCurrently, Network in our country is confined to accounting system. However, accounting information is closely related to that of other sectors inside the enterprise. For example, personnel information involves wage accounting, business segments information involves sales and purchase accounting. Changes of information in different sectors would give rise to variations of accounting data.But software in our country rarely is "event-driven" system. Instead, different sectors use different software to conduct their own management, which fails to realize timely updating and sharing of data. This not only wastes human and financial resources, but also increases the error rate of data which reduces the effectiveness of utilizing accounting information.4.Solutions of related problemscation and training of related personnels4.1.1Enhance thinking and understanding of personnelsPopularization of accounting computerization is a great cause of far-reaching significance so that people should fundamentally have an overall and profound understanding of accounting computerization.Related departments of the country should take every opportunity and adopt a variety of ways to reinforce the propaganda of accounting Network. Publicize functions and significance of accounting Network by taking advantage of leadership and accounting personnel meeting under the circumstance of unified issuing and arrangement of Finance Bureau.Assign professionals to do this job in different units and make them be aware that accounting Network not only emancipates most accounting staff from heavy labours but also feed back accounting information timely, systematically and comprehensively. This is beneficial to unit leaders in acquiring the latest information of economic activity, predicting various kinds of business programs, and reflecting the variation tendency of market as well.In addition, it can be also used in management for promoting the economic benefit of a unit to the utmost extent. In the meantime, Network provides office automation with impetus and substantially increases office efficiency. It is aninevitable choice of modern financial accounting and management that further clarifying the implementation of accounting Network, which is a basic skill for accounting personnel of the 21st century. Therefore, the profound understanding of accounting Network must be improved so as to lay the foundation of popularizing accounting Network in terms of thinking and understanding.4.1.2Reinforce the cultivation of "inter-disciplinary" talents of accounting NetworkPromote the cultivation of accounting Network talents of high level in institutions of higher education. Set up the major of accounting Network in colleges and add computer specialty to finance and accounting specialty. Meanwhile, colleges and universities should also enhance the cultivation of accounting audit talents. At present, there is hardly accounting audit curriculum in colleges and universities, which causes the extreme shortage of computer audit talents. Reinforce the training of Network knowledge for accounting personnels that are incumbent. Due to the lack of accounting Network in some small-sized enterprises and the requirement of basic Network personnels in units which have access to accounting Network, only a portion of people are acknowledged with basic Network. But it is important to cultivate talent that are acknowledged with middle-rank accounting Network.And after the training, it must be made an emphasis of sequent educational training annually. Update training, improve the Network knowledge structure of accounting personnels and enrich relevant computer knowledges. Today, computer technologies are changing rapidly and new application softwares continue to spring up. Operating system needs to be upgraded every one or two years.There are still a series of problems for accounting software like being upgraded and added with new functions, even though they do not need to be alternated. All these require the adaptation to constantly changing situations and the retraining of accounting Network knowledge for accounting personnels. Enterprises should cultivate backbones of accounting Network and stimulate the improvement of accounting personnel quality.Units that are equipped with Network should make investment of humanresources in terms of accounting Network according to actual situations and train several accounting personnels who are not only possessed of better capability of computer application and maintenance but also efficient in accounting softwares and computer, as well as knowledge of accounting Network. It increases the level of accounting Network in the unit and facilitates theimprovement of other accounting personnel quality by carring out training activities inside department from time to time.4.2.Promote the establishment of hardware facilities4.2.1Realize the transformation of Network system from "accounting" to "managing"Financial information, as a comprehensive reflection of economic activities of an enterprise, makesaccounting management the core of enterprise management. Thus, it is necessary to carry forward and develop vigorously accounting Network in order to realize modernization of enterprise management. Although some current units have began the transformation of accounting software from accounting to managing, generally speaking, modules are not be able to meet the needs of management. Accounting Network must be combined with management accounting system in order to give full play to its advantages and promote the establishment and the improvement of management information system for enterprises.From the perspective of development, enterprises should establish two subsystems and combine them together organically so as to make use of financial and accounting information and build up accounting models which meet the need of management. Therefore, the transformation of accounting Network from accounting to managing will push forward the establishment of a financial-centred managing system of Enterprise Resource Planning (ERP) inside the enterprise4.2.2Accelerate the development of accounting softwareAccounting software is a fundamental link of accounting Network. Through accelerating the development, evaluation and acceptance of accounting software, its system can be made more reliable and safer, of which calculations are more accurate and report forms are more timely and clearer. Thus, accounting software can beaccepted by more financial and accountancy personnels. In the system of software, attentions must be paid to the developing of indispensable managing function, as well as functions of anti-virus and preventing illegal tampering with data. In the meantime, software companies should also promote the training of software personnels and the quality of after-sale services普及会计电算化网络化存在的问题及对策1．简介中国的会计软件正在经历从基于会计系统的事后会计到综合管理信息系统的转变。

相关文档
最新文档