problem solution paper
高中英语阅读理解解题技巧ppt课件

High school students should be able to read carefully and analyze the structure, language, and content of texts. They should also be able to identify the author's purpose, arguments, and evidence used in the text.
Practice suggestions
Provide students with critical reading assignments, encourage them to question and evaluate the information in texts, and train them to use reasoning skills effectively.
Problem solving strategies
Strategies for finding the main idea
identify the topic sentence or the conclusion paragraph, summarize the content, or find the repeated or key words.
02 03
Detail description
High school students should be able to infer the author's implicit meanings, evaluate the credibility of the information presented in the text, and make informed judgments based on the evidence provided.
Apigee Edge Pivotal Platform Solution 文件说明书

Apigee Edge - Pivotal Platform Solution PaperAnkur ShuklaDecember 2019This paper describes a few approaches on enabling API Management (using Apigee Edge) for your apps on Pivotal Application Service (PAS). The steps captured in this document have been validatedfor version 2.7 of PAS as of the publication date of this paper. You may have to make modifications as necessary for future versions. DefinitionsApigee EdgeApigee is a full lifecycle API management platform that enablesAPI providers to design, secure, deploy, monitor, and scale APIs. Apigee sits in-line with runtime API traffic and enforces a set ofout-of-the-box API policies, including key validation, quota manage-ment, transformation, authorization, and access control. API providers use the customizable developer portal to enable developers to con-sume APIs easily and securely as well as measure API performance and usage.Apigee MicrogatewayApigee Microgateway is a lightweight, secure, HTTP-based message processor designed especially for microservices. Its main job is to process requests and responses to and from backend services securely while asynchronously pushing valuable API execution data to Apigee Edge, where it’s consumed by the Edge analytics system.Apigee Microgateway depends on and interacts with Apigee Edge. Apigee Microgateway must communicate with an Apigee Edge organization to function. This Apigee Edge organization instance could be running on cloud as a managed service provided by Google/ Apigee, within your data center on premises, or on your own private/ public cloud.Apigee API ProxyYou expose APIs in Apigee Edge by implementing API proxies. API proxies decouple the app-facing API from your backend services, shielding those apps from backend code changes. An API proxy is essentially a message flow that is comprised of policies (XML con-figs) that execute in sequence when the API is invoked. These policies enable you to control the behavior of the underlying APIs. What are Route Services and how do they work?Cloud Foundry (CF) app developers may wish to apply security, trans-formation, or processing to requests before they reach an app. Common examples include authentication and rate limiting. RouteServices are a kind of Marketplace Service that developers can use to apply various transformations to application requests. This is typically done by binding an app’s route to a service instance. Through integra-tions with services, providers can offer these services to developers with an automated, self-service and on-demand user experience. In its current offerings, Cloud Foundry supports the following models for route-based services:1. Fully brokered service2. Static brokered service3. User-provided serviceFully brokered and static brokered require a service broker, which is typically deployed through Ops Manager as a Tile within your Cloud Foundry foundation. A user-provided service does not require a ser-vice broker and hence can be set up and configured completely by your developer. We will be using the user-provided service model as reference architecture pattern to demonstrate Apigee integrations. The following diagram illustrates the traffic flow for a typical route-based integration using the user-provided service discussed later in this document.PatternsThis section describes a few patterns/approaches that can provide API Management for applications deployed on PAS. The patterns differ depending on how the traffic flows and what components of Apigee (Edge vs Edge Microgateway) end up servicing traffic. Pattern: Apigee Edge Microgateway Service on PASApigee Edge Microgateway (EMG) can be hosted within the PAS platform as an application. This application can then be used to instantiate and provide a user-provided service. The user-provided service is then available for ‘binding’ to your applications and pro-vides services like API security using an API key or OAuth 2.0, support for CORS, rate limiting, and so on. This integration relies upon the Route Services-based integration pattern that is offered natively by the PAS platform.The following sequence diagram illustrates the typical flow of trafficwithin PAS:Apigee Edge Microgateway (EMG) Plan using User Provided Service (Route Services Integration) Setting up Microgateway as a User-ProvidedService (UPS)To use EMG as a user-provided service, we push EMG as an applica-tion to our CF environment. Once EMG is up and running as a CFapplication, we do the following:• Create an EMG-aware proxy within Apigee Edge to handleCF traffic.• Create a user-provided service by appending the CFapplication’s (EMG) URL to the EMG proxy's base path.Setting up an EMG application in CF, creating an EMG proxy defini-tion in Edge, and creating a UPS is only needed to be done once.After you create the UPS, you will only need to bind each (target)application that intends to use this service.PrerequisitePlease follow the Microgateway Operation and Configuration docu-mentation to ensure that you have a local copy of EMG set up tocommunicate with your Apigee Edge organization. The “config.yaml”file, key, and secret you'll create are required to push your EMG to CF.Create a User-Provided Servicea. Push EMG as an Application to CF:i. In a terminal, Git clone the EMG code repo and “cd” to the“microgateway” directory.ii. Edit the manifest.yml File and provide appropriate valuesfor the following environment variables:EDGEMICRO_KEY,EDGEMICRO_SECRET,EDGEMICRO_ENV,EDGEMICRO_ORGEDGEMICRO_CONFIG_DIR - hardcode this to valueto ‘./config’Note - To obtain key/secret, see the MicrogatewayOperation and Configuration documentation.iii. Copy your microcogateway’s config file from your homedirectory that was created during setup (seeprerequisites), and open the new file in an editor.iv. Optimize the config file created in the previous step for CFby changing the port to 8080 and adding plugins asshown in the following example: (Note - The OAuth pluginis disabled to limit the scope of this solution paper).v. Include the custom plugin cloud-foundry-emg-servicewithin the plugin sequence section (see previousexample). This plugin handles the routing aspect of thecalls to ensure that the handshake with the CF Routerhappens seamlessly. The sample code for this plugin isavailable here. (This is likely to be changed). Create aplugin directory and include the files (index.js & package.json) from the GitHub repo. For more information on howto use plugins with EMG, see Use plugins in the Apigeedocumentation.vi. In the Apigee EdgeUI, login to your Apigee organizationand create an EMG-aware proxy with the base path set tonet’. (Later, the ‘cloud-foundry-emg-service’ plugin willoverwrite this URL with the target CF application's URL).For reference on how to create an EMG-aware proxy, seeSetting up and configuring Edge Microgateway in theApigee documentation.Note - Since we have not enabled the OAuth plugin within our EMG service, we do not need to follow the rest of the above documenta-tion that details the process for creating API products, a developer, and a developer application. However, If you would like to use EMG's OAuth capabilities, you will need to create a product, developer, and application.vii. Your EMG application is now ready to be pushed to Cloud Foundry:b. Create the UPS using the cf create-user-provided-service com-mand, providing the URL for EMG from step vii appended with the basepath of the EMG-aware proxy from step vi) ‘/pcf’.This completes the UPS one-time setup steps. The service is ready to be used for binding by applications that require API management.Bind a Target Application to the EMG Provided Service Push your CF target application that requires API management capabilities from EMG and take note of App Name and Application’s URL.a. Now we are ready to bind our sample application to the UPS(EMG) using the bind-route-service command:b. Let's Test our binding by making cURL calls:Now repeat the cURL call in quick succession and you should see a spike arrest violation from EMG.Congratulations!! You have now secured your sample application with Apigee Edge Microgateway.Pattern: Apigee Edge Integration with PASSimilar to Apigee Edge Microgateway as a service (previous section),you can create a user-provided service (UPS) with your Apigee Edgeorganization to proxy your application hosted on PAS. The advantageof using an Apigee Edge organization as a UPS is that you can use allthe capabilities of the Apigee Edge platform (45+ out of box policies)and use advanced UI features like trace, since all your traffic will flowthrough Apigee Edge. This Apigee Edge ‘organization’ can be hostedin Apigee Cloud or your own on-premises datacenter (using Apigee onPremise Deployment Kit - OPDK).ORG Plan OverviewSimilar to the user-provided EMG service, the organization service isalso available for ‘binding’ to your applications and provides serviceslike API security using an API key or OAuth 2.0, support for CORS,rate limiting features, and more. The following sequence diagramillustrates the typical flow of traffic within PAS:Apigee Edge (ORG) Plan using User Provided Service (Route Services Integration)Setting up Apigee Edge Organization as aUser-Provided Service (UPS)To use the Apigee Edge organization (org) as a user-provided service, we will create and deploy a proxy within Apigee Edge to make it avail-able for API traffic. This proxy will handle CF traffic, and you'll use the proxy path to create a UPS within the PAS environment. Again, in this pattern too, creating a proxy in your Apigee org and UPS creation are only done once. After you configure the UPS, you will only need to bind each (target) application that intends to use this service. PrerequisiteSignup and register for a free Apigee Edge Evaluation Organization. See https:///apigee.Create a User-Provided Servicea. Create a proxy to act as a facade for your all applications on CF that require API management:i. Use the proxy bundle in this location to create a proxy withinyour Apigee Edge org by using the “Import a Proxy Bundle”dialog within the Apigee Edge UI. You can also import thisproxy using the Apigee Management API.ii. Ensure that your proxy is deployed to the desired environ-ment, illustrated by the following image. Be sure that yourvirtual host in Edge uses HTTPs, as CF requires an HTTPSendpoint for the route services integrations to work.Note - This proxy is a passthrough proxy and does not have any security built in. However, since this proxy is running on Apigee Cloud and will be picking up traffic from CF, you are free to use and implement the OAuth 2.0 or Verify API Key policies in addition to any of the other 45+ Apigee policies. The current implementation of this proxy handles the routing of the CF call to the correct CF target application that the original call was intended for.iii. Create the UPS using cf create-user-provided-servicecommand (provide the URL for the Org Plan Proxy wedeployed in Step ii).This completes the UPS one-time setup. The service is readyto be used for binding by applications that require APImanagement.Bind a Target Application to the Org UPSb. Push your CF target application that requires API managementcapabilities from the Apigee org and take note of App Name and Application’s URL.i. Now you are ready to bind the sample application to theuser provided service (org) using the b i nd-route-servicecommand:ii. Test the binding by making cURL calls:Now Turn on the trace feature within Apigee Edge and repeatthe cURL call. You should be able to see the API calltraversing through Apigee Edge.Note: If you are unfamiliar with how to use Apigee Trace tool, see Using the trace tool in the Apigee documentation.Congratulations!! You have now secured your sample application with and Apigee Edge org.Summary - Final thoughts…In this solution paper we discussed a couple of approaches on how Apigee could be used within PAS for API Management. In both the approaches we have relied on a single proxy creation within Apigee Edge to manage our runtime traffic for all CF Applications. This is an optimized approach as it induces less overhead by relying on one proxy / service for ‘N’ apps; in this scenario the analytics for the N apps, will be aggregated under the API proxy. Another approach obviously will be to create a separate proxy within Apigee Edge and then a new UPS using the proxy base paths. This will mean that you have one proxy and one UPS for each application. This approach induces extra overhead but has the side benefit of visualizing analyt-ics of each individual app.ResourcesMicrogateway custom plugin for the EMG pattern:https:///ankurshukla80/cloud-foundry-emg-service Proxy bundle for running the Apigee org pattern:https:///ankurshukla80/cloud-foundry-emg-service/blob/ master/Resources/Org-Plan-For-PCF_rev1_2019_12_05.zip。
PaperReview写法

paper review的一般写法一篇Paper Review按照内容可以分为三个部分:1、这篇Paper的概况。
谁写的?在哪儿写的?哪年发表的等等……2、这篇Paper的内容。
3、你对这篇Paper的看法。
详细点来说是这样的:第一部分:文章概况这部分是最为简单和公式化的,内容主要是文章的作者,作者所处的位置,文章的出处:会议论文还是期刊,或者是网上的资料,文章的读者是哪些。
如果有必要,可以在这部分加入对文章整体的简略评价。
第二部分:文章内容这部分也是比较公式化的。
因为每一篇合格的论文都会包含一下的几个部分:1.background 背景2.problem/hypothesis 问题/假设3.solution/argumentation 解决方案/论证4.experimental test/conclusion 实验/结论把每个点用一句话来概括就可以了,要注意的是不必叙述每个细节,把文章的主线理清楚就可以了。
第三部分:你的看法这部分是最为重要的,你的评价应该直接反映该篇文章对你的研究有何意义、文章的强处以及弱处。
你对文章的评价可以分为三层。
最高层的是对文章的内容的评价,例如方法是否新颖,解决的问题是否有意义,所用的实验步骤、实验对象是否合适,结论是否正确。
第二层是关于文章的结构和风格的,如论述的组织是否合理,论证的过程有没有漏洞,文章的段落结构有没有问题等等。
最底层的是关于文章的用词以及语法方面的评价,句子是否通顺,词语是否恰当,有没有更好的表达方式等等。
三层的重要性是递减的,最上面的那一层是最重要的,这应该是你读文章的重点,也应该是你写Review的重点。
关于一些写Review的细节问题,可以查看这篇出自University of Massachusetts Lowell 的文章。
里面列出了一些写Review的该注意的问题,不过比较凌乱。
此外,还有一点是需要注意的。
写Paper Review要写得批判性,即Critical,可是又不能写成Negative的。
如何写一篇解决问题的文章 problem solution essay 英语作文

如何写一篇解决问题的文章How to craft a problemsolution essayFor writing problem-solving essay you must have good writing ability and you should have the capability to convince the reader that the existing problem actually needs a solution. You should also explain why your solution proposal is the best solution to the existing problem.As we all know in academics we need to deal with different kinds of essays and each essay has slightly different purpose and approach. Problem solution essay is one of the most popular formats of essay writing where you need to identify a problem and offer a solution for itToday in this article we will discuss how you should proceed with problem-solution essays and make it impressive and effective in every possible manner. We as an academic help provider assist students for their academic need for writing and provide custom essay help.We also assist students to have a better understanding of the subjects. In this article, we will discuss steps to write a problem solution essay. And how you can find a good essay topic to decide the best solution and write excellent quality of an essay.let’s get started…How to choose the problem-solution topic?problem solution essayFirst of all, you should try to think about the things that bother you or problems that are not suitable for your solution. Once you will have thought like “I can easily proceed with this essay solution” then you can have a great idea for your paperStep 1: Make a list of issuesFind out about the things or group that belong to the problem. Make a list of issues and try to eliminate them from your solution one by one. Once you eliminate all the things that bother you then you can easily proceed with your essay topics.Step 2: Make a strategyOnce you have a list of all the problems that you may encounter during your writer up. Now make a proper strategy or plan for the solution. This strategy will help you to find out the best possible solution for your essay writer. Always remember the problem doesn’t have to be a big one but you must have the capability to convince other people that it needs to be solved or at least made betterStep 3: Problem solution essay topic listAlways choose a topic in which you have some previous knowledge by doing this you can easily proceed with your essay topic. And you will feel more comfortable while conducting research for it.If you are struggling to find a great topic? Go through the lists below to find out the areas on which your essay topics can be related and according to your preference you can pick a relevant topic form the desired area. Still, if you are unable to choose a relevant topic for your essay in such a situation you can buy essay papers online. And get professional assistance for your requirements1. Relationships2. Social Issues3. Sports4. College Life5. Education6. Family Life7. Driving and TransportationStep 4: Proceed with your essay writeupOnce you are done with your topic now you should proceed with the planned strategy and try to collect relevant information from the reliable sources for your essay writeup.Finding a solutionThe major purpose of the problem-solving essay is to find out the perfect solution for the problem. Your solution must have the following qualitiesIt must be implemented easilyThe solution must be effective at the solving of the problemIt must be cost-efficientIt should be feasibleProblem solution essay outlineWhile working with your essay you must organise every aspect of your essay carefully. It should not lack information or divert from the main theme of the essay.Following are some main goal of your essay writing that must be included in your writeupYour essay must have the capability to gain the attention of the readerYou should try to convince your reader that the problem is important and it needs to be solvedYour explanation for the solution must be concise and clearRepresent your solution in front of the reader in such a way so that he could find it cost-effective and feasibleConvince your reader that your solution is better than other solutionsIntroduction:In the introduction, you should try to describe the problem and its explanation clearly. You should also work on its detailing about why it needs tobe solved and then you should provide your thesis statementThings that you should add while working with your introduction are listed below:If the problem is unknown you should try to explain it in a better way with a complete explanationIf the problem is familiar then you should try to paint a vivid pictureAlways remember you are required to convince the reader in both the situation. So it is quite necessary for you that your essay introduction must be concise and clearThesisOnce you have done with your introduction now you can ask your thesis question. And provide your solution ideas in the thesis statementHere are some tipsAlways try to state your solution in a single sentenceYour thesis statement should come after you explain the problemBody of the essay: Problem solution essay structureGenerally, the body of the essay has three or more paragraph and they must include a proper explanation for your solution. It should givedetail about how this solution can provide a relevant result for the given problem.It also must explain how it will be charged and how you can get funds for it. Provide proper evidence that your solution will definitely be going to work for the given problem and it has the capability to bring positive outcomesThe body of your essay will also seek to argue that your solutionWill solve the problemIt is cost-efficientIt is feasible to implementProvide the most reasonable solution to the problemIt can stand up to possible objectionsIt is better than other solutionsSo if you want to make your argument convincing you should always consider the above objectives in your arguments.Writing the conclusionUsually, the conclusion has one or two paragraphs. If you want to have an excellent ending then your argument should convince your reader that you have provided the best possible solution for the given problem.Here are some effective ideasExplain to the reader what should happen for the given problemDescribe how the solution will change if your plan is adoptedMake an initial framework that will showcase the theme of your arguments about the solution and how it will workProvide a real-life example of a scenario for sowing reliability of your argumentsCite convincing facts, statistics, testimony on the solution or the problemEffective writing tips that you should follow while working with any essayTone: It is the most important element that decides whether the reader will find your arguments convincing or not.Point of view: Because you are trying to convince your reader there is always another person’s point of view who will show his disagreement with your points. And at that moment you should respect his opinion. Try to convince him by showing some real facts and figuresAudience: You should always consider the reaction of your reader and it is quite necessary for any kind of essay writing. You need to address the reader who can implement your proposal. And then you should work on the points that can convince the reader about your opinion. The reader has the power to act on yoursuggestion. So always try to deliver something that could be convinced by the audience.。
Microeconomic Problem Set 4_solution

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In order to maximize its own profit, firm 1 will not choose any price bigger than 4. Thus firm 1 will set ������1 = 4 − ������, ������1������������ = 100 − 4 = 96 and ������2������������ = 0.
max{(100
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The first order condition is:
100 − ������1 − 2������2 = 4
Best response function of firm 2 given firm 1's output
Remark 1 This problem set aims at helping you reviewing olygopolistic competition, externality, and uncertainty. You may want to practice more by doing exercises in the textbook. You may discuss in groups, with each group up to 5 students. However, you must write out your homework by yourself. If you have any question, you may find help either from me or the TA.
Insight Problem Solving A Critical Examination of the Possibility

The Journal of Problem Solving • volume 5, no. 1 (Fall 2012)56Insight Problem Solving: A Critical Examination of the Possibilityof Formal TheoryWilliam H. Batchelder 1 and Gregory E. Alexander 1AbstractThis paper provides a critical examination of the current state and future possibility of formal cognitive theory for insight problem solving and its associated “aha!” experience. Insight problems are contrasted with move problems, which have been formally defined and studied extensively by cognitive psychologists since the pioneering work of Alan Newell and Herbert Simon. To facilitate our discussion, a number of classical brainteasers are presented along with their solutions and some conclusions derived from observing the behavior of many students trying to solve them. Some of these problems are interesting in their own right, and many of them have not been discussed before in the psychologi-cal literature. The main purpose of presenting the brainteasers is to assist in discussing the status of formal cognitive theory for insight problem solving, which is argued to be considerably weaker than that found in other areas of higher cognition such as human memory, decision-making, categorization, and perception. We discuss theoretical barri-ers that have plagued the development of successful formal theory for insight problem solving. A few suggestions are made that might serve to advance the field.Keywords Insight problems, move problems, modularity, problem representation1 Department of Cognitive Sciences, University of California Irvine/10.7771/1932-6246.1143Insight Problem Solving: The Possibility of Formal Theory 57• volume 5, no. 1 (Fall 2012)1. IntroductionThis paper discusses the current state and a possible future of formal cognitive theory for insight problem solving and its associated “aha!” experience. Insight problems are con-trasted with so-called move problems defined and studied extensively by Alan Newell and Herbert Simon (1972). These authors provided a formal, computational theory for such problems called the General Problem Solver (GPS), and this theory was one of the first formal information processing theories to be developed in cognitive psychology. A move problem is posed to solvers in terms of a clearly defined representation consisting of a starting state, a description of the goal state(s), and operators that allow transitions from one problem state to another, as in Newell and Simon (1972) and Mayer (1992). A solu-tion to a move problem involves applying operators successively to generate a sequence of transitions (moves) from the starting state through intermediate problem states and finally to a goal state. Move problems will be discussed more extensively in Section 4.6.In solving move problems, insight may be required for selecting productive moves at various states in the problem space; however, for our purposes we are interested in the sorts of problems that are described often as insight problems. Unlike Newell and Simon’s formal definition of move problems, there has not been a generally agreed upon defini-tion of an insight problem (Ash, Jee, and Wiley, 2012; Chronicle, MacGregor, and Ormerod, 2004; Chu and MacGregor, 2011). It is our view that it is not productive to attempt a pre-cise logical definition of an insight problem, and instead we offer a set of shared defining characteristics in the spirit of Wittgenstein’s (1958) definition of ‘game’ in terms of family resemblances. Problems that we will treat as insight problems share many of the follow-ing defining characteristics: (1) They are posed in such a way as to admit several possible problem representations, each with an associated solution search space. (2) Likely initial representations are inadequate in that they fail to allow the possibility of discovering a problem solution. (3) In order to overcome such a failure, it is necessary to find an alternative productive representation of the problem. (4) Finding a productive problem representation may be facilitated by a period of non-solving activity called incubation, and also it may be potentiated by well-chosen hints. (5) Once obtained, a productive representation leads quite directly and quickly to a solution. (6) The solution involves the use of knowledge that is well known to the solver. (7) Once the solution is obtained, it is accompanied by a so-called “aha!” experience. (8) When a solution is revealed to a non-solver, it is grasped quickly, often with a feeling of surprise at its simplicity, akin to an “aha!” experience.It is our position that very little is known empirically or theoretically about the cogni-tive processes involved in solving insight problems. Furthermore, this lack of knowledge stands in stark contrast with other areas of cognition such as human memory, decision-making, categorization, and perception. These areas of cognition have a large number of replicable empirical facts, and many formal theories and computational models exist that attempt to explain these facts in terms of underlying cognitive processes. The main goal58W. H. Batchelder and G. E. Alexander of this paper is to explain the reasons why it has been so difficult to achieve a scientific understanding of the cognitive processes involved in insight problem solving.There have been many scientific books and papers on insight problem solving, start-ing with the seminal work of the Gestalt psychologists Köhler (1925), Duncker (1945), and Wertheimer (1954), as well as the English social psychologist, Wallas (1926). Since the contributions of the early Gestalt psychologists, there have been many journal articles, a few scientific books, such as those by Sternberg and Davidson (1996) and Chu (2009), and a large number of books on the subject by laypersons. Most recently, two excellent critical reviews of insight problem solving have appeared: Ash, Cushen, and Wiley (2009) and Chu and MacGregor (2011).The approach in this paper is to discuss, at a general level, the nature of several fun-damental barriers to the scientific study of insight problem solving. Rather than criticizing particular experimental studies or specific theories in detail, we try to step back and take a look at the area itself. In this effort, we attempt to identify principled reasons why the area of insight problem solving is so resistant to scientific progress. To assist in this approach we discuss and informally analyze eighteen classical brainteasers in the main sections of the paper. These problems are among many that have been posed to hundreds of upper divisional undergraduate students in a course titled “Human Problem Solving” taught for many years by the senior author. Only the first two of these problems can be regarded strictly as move problems in the sense of Newell and Simon, and most of the rest share many of the characteristics of insight problems as described earlier.The paper is divided into five main sections. After the Introduction, Section 2 describes the nature of the problem solving class. Section 3 poses the eighteen brainteasers that will be discussed in later sections of the paper. The reader is invited to try to solve these problems before checking out the solutions in the Appendix. Section 4 lays out six major barriers to developing a deep scientific theory of insight problem solving that we believe are endemic to the field. We argue that these barriers are not present in other, more theo-retically advanced areas of higher cognition such as human memory, decision-making, categorization, and perception. These barriers include the lack of many experimental paradigms (4.1), the lack of a large, well-classified set of stimulus material (4.2), and the lack of many informative behavioral measures (4.3). In addition, it is argued that insight problem solving is difficult to study because it is non-modular, both in the sense of Fodor (1983) but more importantly in several weaker senses of modularity that admit other areas of higher cognition (4.4), the lack of theoretical generalizations about insight problem solv-ing from experiments with particular insight problems (4.5), and the lack of computational theories of human insight (4.6). Finally, in Section 5, we suggest several avenues that may help overcome some of the barriers described in Section 4. These include suggestions for useful classes of insight problems (5.1), suggestions for experimental work with expert problem solvers (5.2), and some possibilities for a computational theory of insight.The Journal of Problem Solving •Insight Problem Solving: The Possibility of Formal Theory 592. Batchelder’s Human Problem Solving ClassThe senior author, William Batchelder, has taught an Upper Divisional Undergraduate course called ‘Human Problem Solving” for over twenty-five years to classes ranging in size from 75 to 100 students. By way of background, his active research is in other areas of the cognitive sciences; however, he maintains a long-term hobby of studying classical brainteasers. In the area of complex games, he achieved the title of Senior Master from the United States Chess Federation, he was an active duplicate bridge player throughout undergraduate and graduate school, and he also achieved a reasonable level of skill in the game of Go.The content of the problem-solving course is split into two main topics. The first topic involves encouraging students to try their hand at solving a number of famous brainteasers drawn from the sizeable folklore of insight problems, especially the work of Martin Gardner (1978, 1982), Sam Loyd (1914), and Raymond Smullyan (1978). In addition, games like chess, bridge, and Go are discussed. The second topic involves presenting the psychological theory of thinking and problem solving, and in most cases the material is organized around developments in topics that are covered in the first eight chapters of Mayer (1992). These topics include work of the Gestalt psychologists on problem solving, discussion of experiments and theories concerning induction and deduction, present-ing the work on move problems, including the General Problem Solver (Newell & Simon, 1972), showing how response time studies can reveal mental architectures, and describing theories of memory representation and question answering.Despite efforts, the structure of the course does not reflect a close overlap between its two main topics. The principal reason for this is that in our view the level of theoreti-cal and empirical work on insight problem solving is at a substantially lower level than is the work in almost any other area of cognition dealing with higher processes. The main goal of this paper is to explain our reasons for this pessimistic view. To assist in this goal, it is helpful to get some classical brainteasers on the table. While most of these problems have not been used in experimental studies, the senior author has experienced the solu-tion efforts and post solution discussions of over 2,000 students who have grappled with these problems in class.3. Some Classic BrainteasersIn this section we present eighteen classical brainteasers from the folklore of problem solving that will be discussed in the remainder of the paper. These problems have de-lighted brainteaser connoisseurs for years, and most are capable of giving the solver a large dose of the “aha!” experience. There are numerous collections of these problems in books, and many collections of them are accessible through the Internet. We have selected these problems because they, and others like them, pose a real challenge to any effort to • volume 5, no. 1 (Fall 2012)60W. H. Batchelder and G. E. Alexander develop a deep and general formal theory of human or machine insight problem solving. With the exception of Problems 3.1 and 3.2, and arguably 3.6, the problems are different in important respects from so-called move problems of Newell and Simon (1972) described earlier and in Section 4.6.Most of the problems posed in this section share many of the defining characteristics of insight problems described in Section 1. In particular, they do not involve multiple steps, they require at most a very minimal amount of technical knowledge, and most of them can be solved by one or two fairly simple insights, albeit insights that are rarely achieved in real time by problem solvers. What makes these problems interesting is that they are posed in such a way as to induce solvers to represent the problem information in an unproductive way. Then the main barrier to finding a solution to one of these problems is to overcome a poor initial problem representation. This may involve such things as a re-representation of the problem, the dropping of an implicit constraint on the solution space, or seeing a parallel to some other similar problem. If the solver finds a productive way of viewing the problem, the solution generally follows rapidly and comes with burst of insight, namely the “aha!” experience. In addition, when non-solvers are given the solu-tion they too may experience a burst of insight.What follows next are statements of the eighteen brainteasers. The solutions are presented in the Appendix, and we recommend that after whatever problem solving activity a reader wishes to engage in, that the Appendix is studied before reading the remaining two sections of the paper. As we discuss each problem in the paper, we provide authorship information where authorship is known. In addition, we rephrased some of the problems from their original sources.Problem 3.1. Imagine you have an 8-inch by 8-inch array of 1-inch by 1-inch little squares. You also have a large box of 2-inch by 1-inch rectangular shaped dominoes. Of course it is easy to tile the 64 little squares with dominoes in the sense that every square is covered exactly once by a domino and no domino is hanging off the array. Now sup-pose the upper right and lower left corner squares are cut off the array. Is it possible to tile the new configuration of 62 little squares with dominoes allowing no overlaps and no overhangs?Problem 3.2. A 3-inch by 3-inch by 3-inch cheese cube is made of 27 little 1-inch cheese cubes of different flavors so that it is configured like a Rubik’s cube. A cheese-eating worm devours one of the top corner cubes. After eating any little cube, the worm can go on to eat any adjacent little cube (one that shares a wall). The middlemost little cube is by far the tastiest, so our worm wants to eat through all the little cubes finishing last with the middlemost cube. Is it possible for the worm to accomplish this goal? Could he start with eating any other little cube and finish last with the middlemost cube as the 27th?The Journal of Problem Solving •Insight Problem Solving: The Possibility of Formal Theory 61 Figure 1. The cheese eating worm problem.Problem 3.3. You have ten volumes of an encyclopedia numbered 1, . . . ,10 and shelved in a bookcase in sequence in the ordinary way. Each volume has 100 pages, and to simplify suppose the front cover of each volume is page 1 and numbering is consecutive through page 100, which is the back cover. You go to sleep and in the middle of the night a bookworm crawls onto the bookcase. It eats through the first page of the first volume and eats continuously onwards, stopping after eating the last page of the tenth volume. How many pieces of paper did the bookworm eat through?Figure 2.Bookcase setup for the Bookworm Problem.Problem 3.4. Suppose the earth is a perfect sphere, and an angel fits a tight gold belt around the equator so there is no room to slip anything under the belt. The angel has second thoughts and adds an inch to the belt, and fits it evenly around the equator. Could you slip a dime under the belt?• volume 5, no. 1 (Fall 2012)62W. H. Batchelder and G. E. Alexander Problem 3.5. Consider the cube in Figure 1 and suppose the top and bottom surfaces are painted red and the other four sides are painted blue. How many little cubes have at least one red and at least one blue side?Problem 3.6. Look at the nine dots in Figure 3. Your job is to take a pencil and con-nect them using only three straight lines. Retracing a line is not allowed and removing your pencil from the paper as you draw is not allowed. Note the usual nine-dot problem requires you to do it with four lines; you may want to try that stipulation as well. Figure 3.The setup for the Nine-Dot Problem.Problem 3.7. You are standing outside a light-tight, well-insulated closet with one door, which is closed. The closet contains three light sockets each containing a working light bulb. Outside the closet, there are three on/off light switches, each of which controls a different one of the sockets in the closet. All switches are off. Your task is to identify which switch operates which light bulb. You can turn the switches off and on and leave them in any position, but once you open the closet door you cannot change the setting of any switch. Your task is to figure out which switch controls which light bulb while you are only allowed to open the door once.Figure 4.The setup of the Light Bulb Problem.The Journal of Problem Solving •Insight Problem Solving: The Possibility of Formal Theory 63• volume 5, no . 1 (Fall 2012)Problem 3.8. We know that any finite string of symbols can be extended in infinitely many ways depending on the inductive (recursive) rule; however, many of these ways are not ‘reasonable’ from a human perspective. With this in mind, find a reasonable rule to continue the following series:Problem 3.9. You have two quart-size beakers labeled A and B. Beaker A has a pint of coffee in it and beaker B has a pint of cream in it. First you take a tablespoon of coffee from A and pour it in B. After mixing the contents of B thoroughly you take a tablespoon of the mixture in B and pour it back into A, again mixing thoroughly. After the two transfers, which beaker, if either, has a less diluted (more pure) content of its original substance - coffee in A or cream in B? (Forget any issues of chemistry such as miscibility).Figure 5. The setup of the Coffee and Cream Problem.Problem 3.10. There are two large jars, A and B. Jar A is filled with a large number of blue beads, and Jar B is filled with the same number of red beads. Five beads from Jar A are scooped out and transferred to Jar B. Someone then puts a hand in Jar B and randomly grabs five beads from it and places them in Jar A. Under what conditions after the second transfer would there be the same number of red beads in Jar A as there are blue beads in Jar B.Problem 3.11. Two trains A and B leave their train stations at exactly the same time, and, unaware of each other, head toward each other on a straight 100-mile track between the two stations. Each is going exactly 50 mph, and they are destined to crash. At the time the trains leave their stations, a SUPERFLY takes off from the engine of train A and flies directly toward train B at 100 mph. When he reaches train B, he turns around instantly, A BCD EF G HI JKLM.............64W. H. Batchelder and G. E. Alexander continuing at 100 mph toward train A. The SUPERFLY continues in this way until the trains crash head-on, and on the very last moment he slips out to live another day. How many miles does the SUPERFLY travel on his zigzag route by the time the trains collide?Problem 3.12. George lives at the foot of a mountain, and there is a single narrow trail from his house to a campsite on the top of the mountain. At exactly 6 a.m. on Satur-day he starts up the trail, and without stopping or backtracking arrives at the top before6 p.m. He pitches his tent, stays the night, and the next morning, on Sunday, at exactly 6a.m., he starts down the trail, hiking continuously without backtracking, and reaches his house before 6 p.m. Must there be a time of day on Sunday where he was exactly at the same place on the trail as he was at that time on Saturday? Could there be more than one such place?Problem 3.13. You are driving up and down a mountain that is 20 miles up and 20 miles down. You average 30 mph going up; how fast would you have to go coming down the mountain to average 60 mph for the entire trip?Problem 3.14. During a recent census, a man told the census taker that he had three children. The census taker said that he needed to know their ages, and the man replied that the product of their ages was 36. The census taker, slightly miffed, said he needed to know each of their ages. The man said, “Well the sum of their ages is the same as my house number.” The census taker looked at the house number and complained, “I still can’t tell their ages.” The man said, “Oh, that’s right, the oldest one taught the younger ones to play chess.” The census taker promptly wrote down the ages of the three children. How did he know, and what were the ages?Problem 3.15. A closet has two red hats and three white hats. Three participants and a Gamesmaster know that these are the only hats in play. Man A has two good eyes, man B only one good eye, and man C is blind. The three men sit on chairs facing each other, and the Gamesmaster places a hat on each man’s head, in such a way that no man can see the color of his own hat. The Gamesmaster offers a deal, namely if any man correctly states the color of his hat, he will get $50,000; however, if he is in error, then he has to serve the rest of his life as an indentured servant to the Gamesmaster. Man A looks around and says, “I am not going to guess.” Then Man B looks around and says, “I am not going to guess.” Finally Man C says, “ From what my friends with eyes have said, I can clearly see that my hat is _____”. He wins the $50,000, and your task is to fill in the blank and explain how the blind man knew the color of his hat.Problem 3.16. A king dies and leaves an estate, including 17 horses, to his three daughters. According to his will, everything is to be divided among his daughters as fol-lows: 1/2 to the oldest daughter, 1/3 to the middle daughter, and 1/9 to the youngest daughter. The three heirs are puzzled as to how to divide the horses among themselves, when a probate lawyer rides up on his horse and offers to assist. He adds his horse to the kings’ horses, so there will be 18 horses. Then he proceeds to divide the horses amongThe Journal of Problem Solving •Insight Problem Solving: The Possibility of Formal Theory 65 the daughters. The oldest gets ½ of the horses, which is 9; the middle daughter gets 6 horses which is 1/3rd of the horses, and the youngest gets 2 horses, 1/9th of the lot. That’s 17 horses, so the lawyer gets on his own horse and rides off with a nice commission. How was it possible for the lawyer to solve the heirs’ problem and still retain his own horse?Problem 3.17. A logical wizard offers you the opportunity to make one statement: if it is false, he will give you exactly ten dollars, and if it is true, he will give you an amount of money other than ten dollars. Give an example of a statement that would be sure to make you rich.Problem 3.18. Discover an interesting sense of the claim that it is in principle impos-sible to draw a perfect map of England while standing in a London flat; however, it is not in principle impossible to do so while living in a New York City Pad.4. Barriers to a Theory of Insight Problem SolvingAs mentioned earlier, our view is that there are a number of theoretical barriers that make it difficult to develop a satisfactory formal theory of the cognitive processes in play when humans solve classical brainteasers of the sort posed in Section 3. Further these barriers seem almost unique to insight problem solving in comparison with the more fully developed higher process areas of the cognitive sciences such as human memory, decision-making, categorization, and perception. Indeed it seems uncontroversial to us that neither human nor machine insight problem solving is well understood, and com-pared to other higher process areas in psychology, it is the least developed area both empirically and theoretically.There are two recent comprehensive critical reviews concerning insight problem solving by Ash, Cushen, and Wiley (2009) and Chu and MacGregor (2011). These articles describe the current state of empirical and theoretical work on insight problem solving, with a focus on experimental studies and theories of problem restructuring. In our view, both reviews are consistent with our belief that there has been very little sustainable progress in achieving a general scientific understanding of insight. Particularly striking is that are no established general, formal theories or models of insight problem solving. By a general formal model of insight problem solving we mean a set of clearly formulated assumptions that lead formally or logically to precise behavioral predictions over a wide range of insight problems. Such a formal model could be posed in terms of a number of formal languages including information processing assumptions, neural networks, computer simulation, stochastic assumptions, or Bayesian assumptions.Since the groundbreaking work by the Gestalt psychologists on insight problem solving, there have been theoretical ideas that have been helpful in explaining the cog-nitive processes at play in solving certain selected insight problems. Among the earlier ideas are Luchins’ concept of einstellung (blind spot) and Duncker’s functional fixedness, • volume 5, no. 1 (Fall 2012)as in Maher (1992). More recently, there have been two developed theoretical ideas: (1) Criterion for Satisfactory Progress theory (Chu, Dewald, & Chronicle, 2007; MacGregor, Ormerod, & Chronicle, 2001), and (2) Representational Change Theory (Knoblich, Ohls-son, Haider, & Rhenius, 1999). We will discuss these theories in more detail in Section 4. While it is arguable that these theoretical ideas have done good work in understanding in detail a few selected insight problems, we argue that it is not at all clear how these ideas can be generalized to constitute a formal theory of insight problem solving at anywhere near the level of generality that has been achieved by formal theories in other areas of higher process cognition.The dearth of formal theories of insight problem solving is in stark contrast with other areas of problem solving discussed in Section 4.6, for example move problems discussed earlier and the more recent work on combinatorial optimization problems such as the two dimensional traveling salesman problem (MacGregor and Chu, 2011). In addition, most other higher process areas of cognition are replete with a variety of formal theories and models. For example, in the area of human memory there are currently a very large number of formal, information processing models, many of which have evolved from earlier mathematical models, as in Norman (1970). In the area of categorization, there are currently several major formal theories along with many variations that stem from earlier theories discussed in Ashby (1992) and Estes (1996). In areas ranging from psycholinguistics to perception, there are a number of formal models based on brain-style computation stemming from Rumelhart, McClelland, and PDP Research Group’s (1987) classic two-volume book on parallel distributed processing. Since Daniel Kahneman’s 2002 Nobel Memorial Prize in the Economic Sciences for work jointly with Amos Tversky developing prospect theory, as in Kahneman and Tversky (1979), psychologically based formal models of human decision-making is a major theoretical area in cognitive psychology today. In our view, there is nothing in the area of insight problem solving that approaches the depth and breadth of formal models seen in the areas mentioned above.In the following subsections, we will discuss some of the barriers that have prevented the development of a satisfactory theory of insight problem solving. Some of the bar-riers will be illustrated with references to the problems in Section 3. Then, in Section 5 we will assuage our pessimism a bit by suggesting how some of these barriers might be removed in future work to facilitate the development of an adequate theory of insight problem solving.4.1 Lack of Many Experimental ParadigmsThere are not many distinct experimental paradigms to study insight problem solving. The standard paradigm is to pick a particular problem, such as one of the ones in Section 3, and present it to several groups of subjects, perhaps in different ways. For example, groups may differ in the way a hint is presented, a diagram is provided, or an instruction。
英语学术写作-New-thesis statement and outline
4. Ways of Organizing Content
Some subjects dictate the best order to use or problem to solution; The thesis statement points the way toward organizing the content of your paper.
Compare:
♦
♦
4)
A question cannot serve as a thesis statement. Compare:
♦ ♦ ♦
What are Leni Riefenstahl's contributions to film? Leni Riefenstahl's methods gave new perspective to filming sports. Leni Riefenstahl's use of unconventional camera angles and dramatic editing introduced an artistic perspective to the filming of sporting events.
1)
A promise or statement of purpose cannot serve as a thesis statement.
Compare: In this paper I am going to show how the ancient Egyptians were able to build so many huge temples and tombs.
A comparison / contrast essay usually follows one of these two patterns: the point-by-point pattern or the subject-bysubject pattern.
《逻辑与计算机设计基础》(原书第五版)课后习题答案-chapter01_solutions-5th
1CHAPTER 1© 2016 Pearson Education, Inc.1-1.(a)(1) Calm:(2) 10 mph(3) 100 mphor(b) The microcomputer requires a table or equation for converting from rotations/second to miles/hour. The pulses produced by the rotating disk must be counted over a known period of time, and the table or equation used to convert the binary count to miles per hour.1-2.–34° quantizes to –30° => 1 V => 0001+31° quantizes to +30° => 7 V => 0111 +77° quantizes to +80° => 12 V => 1100 +108° quantizes to +110° => 15 V => 11111-3.*Decimal, Binary, Octal and Hexadecimal Numbers from (16)to (31)1-4.1020301281282131,0723232233,554,4328828,589,934,592=⨯==⨯==⨯=K Bits M Bits G Bits21-5.220 = (1,000,00010 + d ) where d = 48,576 1Tb = 240 = (220)2 = (1,000,000 + d )2= (1,000,000)2 + 2(1,000,000) d + d 2 = 1,000,000,000,000 + 97,152,000,000 + 2,359,627,776 = 1,099,511,627,7761-6.112511212047252133,554,4311 Bits 1 Bits ⇒-=⇒-=1-7.*63202641013275321142(1001101)222277(1010011.101)22222283.625(10101110.1001)2222222174.5625----=+++==+++++==++++++=1-8.1 1 0 0 0 0 0 0 0 0 0 1 0 11-9.*1-10.*a)0.45 × 8 = 3.6 =>0.60 × 8 = 4.8 =>0.80 × 8 = 6.4 =>0.20 × 8 = 3.2 =>10= (16612.3463)8b) (1938.257)10 = (792.41CB)16c) (175.175)10 = (10101111.001011)21-11.*a) (673.6)8= (110 111 011.110)2= (1BB.C)16b) (E7C.B)16= (1110 0111 1100.1011)2= (7174.54)8c) (310.2)4= (11 01 00.10)2= (64.4)81-12.a) 1010 b) 0110 c) 1111001×1100 ×1001 ×0111010000 0110 11110010000 0000 0000001010 0000 11110011010 0110 11110011111000 0110110 11110010000000110110110101341-13.+1000110110101101010000000010000110001101011-----Quotient = 10001R emainder = 1 1-14.(a) 6 × 123 + 8 × 122 + 7 × 121 + 4 = 11608 (b)12 1-15.a)0 1 2 3 4 5 6 7 8 9 A BCDEFGHIJb) 20c) 21012010(.)1120122018201620(4658.8)BCI G -=⨯+⨯+⨯+⨯=1-16.*a) (BEE)r = (2699)1021021114142699111426850r r r r r ⨯+⨯+⨯=⨯+⨯-=By the quadratic equation: r = 15 or ≈ –16.27 ANSWER: r = 15 b) (365)r = (194)102102365194361890r r r r r ⨯+⨯+⨯=⨯+⨯-=By the quadratic equation: r = – 9 or 7 ANSWER: r = 751-17.Errata: The text has an error: 1480 should be 1460. This will be corrected in future printings.Noting the order of operations, first add (34)r and (24)r101010(34)34(24)24(34)(24)58r r r r r r r r r r =⨯+⨯=⨯+⨯+=⨯+⨯Now, multiply the result by (21)r101021(21)(58)10218⨯+⨯⨯⨯+⨯=⨯+⨯+r r r r r r Next, set the result equal to (1480)r and reorganize.21321321010218146161580⨯+⨯+=⨯+⨯+⨯⨯-⨯-⨯-⨯=r r r r r r r r r Finally, find the roots of this cubic polynomial. Solutions are: r = 8, – 1, – 1ANSWER: The chicken has 4 toes on each foot (half of 8).1-18.*a) (0100 1000 0110 0111)BCD = (4867)10= (1001100000011)2 b) (0011 0111 1000.0111 0101)BCD= (378.75)10=(101111010.11)21-19.*(694)10 = (0110 1001 0100)BCD (835)10=(1000 0011 0101)BCD1001 0100 +0011 +0101 1100 1001 +0110 +00001 001010011-20.*(a)101 1000111 1000Move R 011 1100 0 100 column > 0111Subtract 3 −0011011 1001 0Subtract 3 −001101 1001Move R 0 1100 110 100 column > 0111Subtract 3 −00110 1001 110Move R 0100 1110Move R 010 01110Move R 01 001110Move R 0 1001110 Leftmost 1 in BCD numbershifted out: Finished(b) 102101 1000011 1001 0111Move R 001 1100 1011 1 101 and 100 columns > 0111Subtract 3 −0011 -0011001 1001 1000 1Move R 00 1100 1100 01 101 and 100 columns > 0111Subtract 3 −0011 −001100 1001 1001 01Move R 0 0100 1100 101 100 column > 0111Subtract 3 −00110 0100 1001Move R 0010 0100 1101Move R 001 0010 01101Move R 00 1001 001101 100 column > 0111Subtract 3 −001100 0110 001101Move R 0 0011 0001101Move R 0001 10001101Move R 000 110001101 Leftmost 1 in BCDnumber shifted out: Finished 1-21.(a) 10210110011110001st Move L 1 1110002nd Move L 11 110003rd Move L 111 1000 100 column > 100Add 3 00111010 10004th Move L 1 0101 000 100 column > 100Add 3 00111 1000 0005th Move L 11 0000 006th Move L 110 00000 101 column > 100Add 3 00111001 0000 07th Move L 1 0001 00000 Least significant bit in binary number moved in:Finished(b) 103102101100011100101111st Move L 0 11100101112nd Move L 01 1100101113rd Move L 011 100101114th Move L 0111 0010111 100 column > 100Add 3 001161010 00101115th Move L 1 0100 0101116th Move L 10 1000 10111 100 column > 100Add 3 001110 1011 101117th Move L 101 0111 0111 101 & 100 columns > 100Add 3 0011 00111000 1010 01118th Move L 1 0001 0100 1119th Move L 10 0010 1001 11 100 column > 100Add 3 001110 0010 1100 1110th Move L 100 0101 1001 1 101 &100 columns > 100Add 3 0011 0011100 1000 1100 111th Move L 1001 0001 1001 Least significant bit in binary number moved in: Finished1-22.From Table 1-5, complementing the bit B6 will switch an uppercase letter to a lower case letter and vice versa.1-23.a) The name used is Brent M. Ledvina. An alternative answer: use both upper and lower case letters.0100 0010 B 0101 0010 R 0100 0101 E0100 1110 N 0101 0100 T 0010 0000 (SP)0100 1101 M 0010 1110 . 0010 0000 (SP)0100 1100 L 0100 0101 E 0100 0100 D0101 0110 V 0100 1001 I 0100 1110 N0100 0001 Ab) 0100 0010 1101 0010 1100 01010100 1110 1101 0100 1010 00000100 1101 0010 1110 1010 00001100 1100 1100 0101 0100 01000101 0110 1100 1001 0100 11100100 00011-24.1000111 G1101111 o01000001000011 C1100001 a1110010 r1100100 d1101001 i1101110 n1100001 a (Errata: This number appears as 110001, which would be “1”)1101100 l1110011 s0100001 !781-25.*a) (11111111)2b) (0010 0101 0101)BCD c) 011 0010 011 0101 011 0101ASCIId)0011 00101011 01011011 0101ASCII with Odd Parity1-26.a) U+0040 = 01000000b) U+00A2 = 11000010 10100010c) U+20AC = 11100010 10000010 10101100d)U+1F6B2 = 11110000 10011111 10011010 101100101-27.Binary Numbers from (32)to (47) with Odd and Even Parity1-28.Gray Code for Hexadecimal Digits1-29.(a) Wind Direction Gray CodeDirectionCode WordN 000 S 110 E 011 W 101 NW 100 NE 001 SW 111 SE0109(b) Wind Direction Gray Code (directions in adjacent order)DirectionCode WordN 000 NE 001 E 011 SE 010 S 110 SW 111 W 101 NW100As the wind direction changes, the codes change in the order of the rows of this table, as suming that the bottom row is “next to” the top row. From the table, the codes that result due to a wind direction change always change in a single bit.1-30.+The percentage of power consumed by the Gray code counter compared to a binary code counter equals:Number of bit changes using Gray code Number of bit changes using binary codeAs shown in Table 1-6, and by definition, the number of bit changes per cycle of an n-bit Gray code counter is 1 per count = 2n .Number of bit changes using Gray code = 2nFor a binary counter, notice that the least significant bit changes on every increment. The second least significant bit changes on every other increment. The third digit changes on every fourth increment of the counter, and so on. As shown in Table 1-6, the most significant digit changes twice per cycle of the binary counter.Number of bit changes using binary code 11222n n -+++(1)110221(21)122nni i n n i i ++==⎡⎤==-=--=-⎢⎥⎣⎦∑∑ % Power (1)210022n n +=⨯-。
QP-problems
1.1 Notation
k k will denote the 2-norm of vectors and matrices througout the paper. When other
norms are used, this will be indicated explicitly.
2 The penalty function
Abstract
In this paper we describe numerical tests using the Friedlander-Mart nezSantos-method for solving QP problems. It turns out that the exact penalty function given by these authors introduces some additional illconditioning, disabling accurate solution of mildly illconditioned QP's if not combined with a preconditioner.
1
where f 2 ical testing we use the easier
quadratic form (1). Since f is convex, the Karush-Kuhn-Tucker conditions are necessary and su cient for x being a global minimizer of (2). Friedlander et.al. use the KKT-conditions to construct an exact penalty function which de nes a "primal-dual" box-constrained optimization problem with 2n + m variables. In the third section their Trust-Region-SQP method for solving the penalty problem is described. For testing this combination of penalty-function and Trust-Region-SQP approach a special problem generator is used. Numerical results are presented.
problem-solution-evaluation
October, 2nd, 2007Unit FiveSection A The Battle Against AIDSObjectsStudents will be able to:■share the knowledge of and views on AIDS;■understand the main idea and structure of Section A;■learn some devices for developing a paragraph by problem-solution-evaluation pattern, as illustrated in Section A;■master the key language points and grammatical structures in the text;■conduct a series of reading, listening, speaking and writing activities related to the theme of the unit.Focus:■understanding and using the key words, phrases & expressions, patterns of Section A;■understanding the main idea and structure of the text;■mastering the device for developing a paragraph by problem-solution-evaluation pattern;■acquiring the skill of reading for major details.Difficulties:■understanding the structure of the text and the way to develop it;■mastering the device for developing a paragraph by prob lem-solution p attern.Time allotment:■1st-2nd period: Lead-in & reading activities■3rd-4th period: T ext analysis (the key language points & structure)■5th-6th period: Writing tasks■7th period: Checking on students‟ learning tasks(Exercises in Section A & reading activities of Section B & C)Teaching procedure:Step 1Lead-inIntroductory remarksPeople, American or Chinese, tend to turn pale at the mention of one disease. It is probably due to the fact that it always leads to death while there is no known cure for it.US President Bush once said that it is one of the medical challenges of our time. Millions of people around the world were killed by the deadly disease and millions more infected with the virus are expected to die. In the following text, we will learn something about it and try to find out what effective ways w e can take to w in the b attle against it.Warming-up activityShort-answer-Questions1. What is AIDS?Acquired Immune Deficiency Syndrome (后天性免疫缺陷综合症)It is a disease that limits the body‟s ability to fight infec tion (a disease which destroys the natural method the body uses to protect against other diseases). A person with AIDS hasa very weak immune system, turning normally mild or rare diseases into potentiallyfatal conditions.AIDS usually develops in four stages: 1) There is only infection by HIV and antibody (抗体) production; 2) The lymph nodes (淋巴结) enlarge; 3) An infected person may begin to have such signs(症状) as tiredness, fever, and night sweats; 4) AIDS is diagnosed whena person develops certain uncommon, life-threatening illnesses.2.What is HIV? How is it spread?Human Immunodeficiency Virus (人类免疫缺陷病毒)AIDS is different from HIV in that the former usually causes death while HIV may lead to AIDS. HIV is the virus that spreads through contact with infected blood, infected sexual partners or within the womb of an infected pregnant mother. HIV is spread in three ways: 1) contact with infected blood; 2) sex; 3) mother-to-child transmission. After infecting a person, HIV can remain hidden in the body for long and different periods of time until it becomes active and develops into AIDS for which no known cure exists. The virus spreads very fast once contact has b een mad e w ith an infected source.In-depth coverage on AIDS and HIV can be found from /fc/Health/AIDS__HIV3. What do you know about World AIDS Day?December,1st was established as World AIDS Day in 1988. It is the only international day of coordinate action (协调行动) against AIDS.Pair Discussion (questions with open answers)1.Have you ever met a patient of AIDS?2.What will you call to mind when talking about AIDS?3.What people are most likely to become infected?Tip: Anyone can become infected with HIV. HIV is transmitted sexually or through drug use by contaminated blood. You can also get HIV from a blood transfusion, if the HIV is in the blood. But that is rare. Strict rules about who can donate blood and tests on donated blood make transfusions very safe. You cannot get HIV by donating blood. You cannot get HIV just by being in the same room with an infected person, or just by shaking hands or hugging an infected person.Step 2 Reading activities●Reading for general ideaQuestions for thinking about1. What is the negative aspect of AIDS?----It killed millions of people, spreads at an alarming fast speed and is going to kill more. There is no known cure for it. What is worse, the government is inactive in fighting against.2. What do some local organizations do?--- They are involved in the battle against AIDS, using the resources creatively.Main idea: Despite the spread of AIDS, no cure for it and lack of government activity, some local organizations have been active and creative in the battle against the fatal disease.●Reading for some detailsQuestions for discussing1.How many American people have been killed in the past few years?More than 102,000 people2.According to the passage, who are the ones most the likely to be infected withAIDS?Women and youth in rural Southern communities.3.What are the reasons why some local organizations emerged?The spread of AIDS and government inactivity in stopping it.4.What is the purpose of forming the South Carolina AIDS E d ucation Netw ork?T o reduce the number of AIDS cases.5.Why is it impossible to hand out AIDS literature and expect people to read it in somecommunities?The people have a low literacy level in some communities.6.In what way can teenagers do much better than adults accord ing to the p assage?They make it simple and explain the risk of catching AIDS to their peers much better than adults.7.What are the ways to combat AIDS discussed in the passage?First, speak to your community in a way they can hear. Second, train teenagers to educate their peers. Last, redefine “at risk” to include women from different backgrounds and marriage status.8.What should people do in order to win the war against AIDS?Everyone should take part in the war against AIDS.Step 3 Detailed study of the text◆Language points:Paraphrase and translation of difficult sentences1.Acquired Immune Deficiency Syndrome (AIDS) was diagnosed in the United States inthe late 1970s. Since then, AIDS has killed more than 204,000 Americans—half in thepast few years alone. (Para.1)AIDS was discovered by doctors in the last few years of the 1970's. Since then, 204,000 Americans have died of AIDS—about 102,000 died of the disease only in the past few years.2.Despite such alarming numbers, the federal and state governments have been slowin implementing programs to stop the spread of AIDS.(L8)Although the number of people infected with AIDS is very large and surprising, the federal and state governments haven't taken actions in time to carry out the programs to stop the spread of AIDS.3.While no one way of winning the war against AIDS exists, the network shares theselessons learned in its battle against AIDS. (L29)Although there isn‟t any way of stopping the spread of AIDS yet, the network lets others know about the experience which is learnt in its b attle against AIDS.虽然还没有一种能战胜艾滋病的方法,但这一网络机构在与艾滋病的抗争中获得了以下经验。
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Discussion on the Methods of Improving Employability of Graduates under the Current of the University Enrollment ExpansionChen JingjingClass 92- 21109216Problem– Solution EssayAcademic Writing – Spring 2012Instructor: Chris DieckmannSince the university enrollment expansion in 1998, the number of university graduates has been increasing on a large scale yearly. The statistics of the Ministry of Education show that there are 2.8 million university graduates in 2004 and 3.38 million in 2005, 4.13 million in 2006, 4.95 million in 2007, 5.59 million in 2009, 6.3 million in 2010 and in 2011 the number went to 6.6 million. Among those graduates, nearly 1 million are in the status of job-waiting and they have of course been accumulated in the next year. [2] Faced with the difficult situation of university graduates employment, many methods are come up with on improving the employment of graduates under the current of the university enrollment expansion. However, the key element in improving the employment of university graduates is to help them possess the employability, meet the need of the rapidly development of the economic society.Actually, the policy of expansion enrollment is not the only reason causing the difficult situation of university graduates employment. The reasons involve both objective and subjective aspects. In the objective aspect, the need of the employment market increase in a rather rate while the amount of university graduates has been increasing rapidly. In addition, majors in some universities are unreasonable and market positioning of the training mode is inaccurate. [2][3] Under this circumstance, many graduates fail to connect their majors with the need of job market. In the subjective aspect, the university graduates are universally lacking in employability which include professional ability, research ability, innovation and practice ability, etc.China has been aimed at going into the stage that higher education popularized and graduates got taught by mass education instead of elite education. Through the expansion enrollment policy, mass education level has been improved, so the policy itself is not wrong. What we are expected to do is not to change the policy but to improve the subjective aspect.Faced with the difficult situation of graduates’ employment, many graduates choose to respond to the call of government to start their own business instead of finding a job after graduation. Certainly, college students’ self-employment is more challenging and interesting than working for others and role-shifting from a graduate to a manager makes our career more meaningful. Above all, self-employment can solve the difficult situation of employment to a certain extent. However,self-employment is too risky, especially for graduates who have no enough financial support and social experience. In addition, self-employment requires a perfect innovation and practice ability, adaption ability, and professional ability, etc, which need acquire in university, while the real situation is that most graduates in China are lacking in core competitiveness and employment skills. So the self-employment is just an employment approach rather than a solution. The most effective and fundamental solution is to improve the employability of university students. Employability means that university graduates achieve their personal career objectives, meet the needs of the society and show their own values in the society after gaining knowledge and developing comprehensive qualities in the university. To achieve this goal, both university students and universities should go into action.Firstly, university graduates had better make career plan in the first year of the university to forward the starting line of career. When doing career planning, university students can give a comprehensive understanding and analysis on themselves and based on their own background and social circumstance make an overall objective for the university time. Secondly, career guidance should go through the whole period o f students’ university time. It is also necessary to change the career guidance from only providing employment information to guidance of adaptability and growth which have to include guidance on career planning , quality and ability, value on employment, career ideas, job choosing, adaption of the social position and the ideas of graduates. Thirdly, universities improve the “order-orientated cultivation of talents” mode for universities and companies cooperation. The nature of the order-orientated training is to help students “get employed as soon as they graduate”. In the talent-training aspect, students can learn some knowledge or skills of the position they are going to in advance and after they graduate, they can just get the job as soon as possible. Fourthly, universities encourage and train students to carry out research studies to improve practical and innovation abilities. Universities are expected to encourage students to take part in various kinds of competition and technological events to improve professional practical ability of them. Lastly, universities give students professional and personalized career guidance. The university needs to build up consulting room for career guidance and provide face to face and one-for-one guidance for students to resolve confused thoughts of them in finding jobs. [1] [2] [4] [5]Above I analyze the serious employment situation of university graduates under the expansion enrollment policy and provide detailed explanation and representation which will definitely help resolve the employability problem of university graduates. Hope this paper can give universities and university students some tips to help them change the difficult situation.References[1] Huang Y an & Zhong Xiaochuan. On the Changing of College Students’ Idea AboutObtaining Employment Under Expansion of Colleges’Enrollment [J].Nanning: Journal of Nanning Teachers College, 2005, 22(1):61-63.[2] Wen Nuan. Discussing on the Methods and Experiences for ImprovingEmployability of University Graduates in China. [J]. Changchun: Cross-Cultural Communication, 2011, 7(4): 86-90.[3] Wan Yinmei. Expansion of Chinese Higher Education since 1998: Its Causes andOutcomes [J]. Asia Pacific Education Review, 2006, 7(1): 19-31.[4] Liu Y ao-wu, Zhang Qian. New Ideas on the Employment for Graduates under theBackground of the Continuous Expansion of Enrollment and the Fluctuation of Job Market [J]. Journal of Educational Science of Human Normal University,2010, 9(6): 68-114.[5] Lin Furong. A Study of Employment Guidance for College Students in theCircumstances o f Enrollment Expansion [J]. Xiamen: Journal o f Fujian Medical University, 2007, 8(3): 24-26.。