laudon_ec7_ppt01 GE
[课件]EC-7(t)PPT
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行的基本条件是：至少能确保企业有一定量的总利润。
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2) 对峙性定位与回避性定位 对峙性定位，又称竞争性定位，或称针对式定位。它指企
业选择靠近于现有竞争者或与其重合的市场位置，争夺同样的
顾客，彼此在产品、价格、分销及促销方式各个方面的区别不 大。
回避性定位，又称创新式定位。它是指企业回避与目标市
场竞争者直接对抗，将其位置定在市场上某处空白领地或“空
重新定位，也可称二次定位或再定位。它是指企业变动产 品特色，改变目标顾客对其原有的印象，使目标顾客对其产品
新形象重新认识的过程。市场重新定位对于企业适应市场环境、
调整市场营销战略而言是必不可少的。一般来说，企业产品在 市场上的初次定位即使很恰当，但在出现下列情况时也需考虑
重新定位：一是在本企业产品定位附近出现了强大的竞争者，
挤占了本企业品牌的部分市场，导致本企业产品市场萎缩和产 品品牌的目标市场占有率下降；二是消费者偏好发生变化，从
喜爱本企业品牌转移到喜爱竞争者的品牌。
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但是，企业在重新定位前必须要慎重考虑两个问题：一是 企业将自己的品牌定位从一个目标子市场转移到另一个目标子 市场时所付出的全部成本有多大？二是企业重新定位后的营业 额究竟有多大？这取决于该子市场的购买者和竞争状况，以及 在该子市场上的销售价格等。经过慎重论证，重新定位可以进
可以收到较好的营销效果。在虚拟市场中，仅仅做到这一点还
是不够的。这个“有利地位”当然是相对竞争对手而言的。从 这个角度讲，定位不仅要把握消费者的心理，而且要研究竞争 者的优劣势。
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2. 目标市场定位策略 网络营销所定位的目标市场，应具备以下两个条件： (1) 目标市场内所有的人必须具备一至二条基本相同的条 件，比如收入、受教育的程度、职业、消费习惯等，这样才能
阿尔卡特OXE培训教材
Board type 板卡种类
UAI16 UAI8 UAI4
SLI16 SLI8
IP Media Gateway
IP媒体网关
Interface number per Board 数量（每块板件所支持）
16 8 4
16 8
15
精选ppt课件
OXE Overview - Boards
6
精选ppt课件
Agenda
Time
9：00--11：30
Contents
Configuration of IP set IP 电话机管理 System backup and restore系统数据的备份，恢复 Redundancy 双备份切换 Synchronization of data 数据同步
3
精选ppt课件
Agenda
Time
Contents
Hale Waihona Puke 9：00--11：30OXE Overview、Architecture、Boards introduce OXE Functions and Features 功能特点介绍 Hardware installation 硬件连接 System loin 系统登录 Management of system IP address系统IP地址管理
Pick up group and hunting group configuration 代接组 和连选组管理 Practice 练习
5
精选ppt课件
Agenda
Time
Contents
3th
9：00--11：30
Conference (three party and multi party) configuration 电话会议（三方、多方）管理
NON纳恩LED照明培训课件
全球科技吊顶创领者 Technology for life!
（二）、发光原理：
LED可以直接把电能转化为光能。 LED的心脏是一个半导体的晶片， 晶片的一端附着 在一个支架上， 是负极，另一端连接电源的正极， 整个晶片被环氧树脂封装起来。半 导体晶片由两部分组成，一部分是 P型半导体，在它里面空穴占主导 地位，另一端是N型半导体，在这 边主要是电子。但这两种半导体连 接起来的时候，它们之间就形成一 个“P-N结”。当电流通过导线作 用于这个晶片的时候，电子就会被 推向P区，在P区里电子跟空穴复合 ，然后就会以光子的形式发出能量 ，这就是LED发光的原理。而光的 波长决定光的颜色，是由形成P-N 结材料决定的 • 1、LED的核心是芯片，它决定着 LED的基本光色电特性。
全球科技吊顶创领者 Technology for life!
NON纳恩LED照明培训课件
编写人：郑跃闯 江苏纳恩科技发展有限公司www.non.hk 江苏贝莱尔电气有限公司
全球科技吊顶创领者 Technology for life!
目
第一篇 第二篇 LED基础知识 光学基础知识
全球科技吊顶创领者 Technology for life!
照明知识
全球科技吊顶创领者 Technology for life!
(完整)海德汉系统ppt精品PPT资料精品PPT资料
16.三维海德汉iTNC530控制系统，19“TFT彩色显示器， 带smartkey智能钥匙，处理器PentiumM1.8G,硬盘80G, 具有电子手轮；
3.系统：海德汉iTNC 530控制系统
以下几点为高性能加工机床控制系统所需的一些 从而测量元件的反馈均集成在控制单元上。
同时主机单元中的存储是通过容量达30G的硬盘实现的，这对复杂模具加工提供了充足的存储空间。
特性： iTNC 530可实现各种误差补偿，包括线性和非线性轴误差、反向间隙、圆周运动的方向尖角、热膨胀及粘滞摩擦。
iTNC 530具有理想的程序段处理速度性能，实现短的程序段处理时间（0.
8.直线轴(x,y,z)快移速度40m/min;
9.直线轴(x,y,z)最大进给速度40000m/min;
10.具有红外测头，具有3D快速调整包以便快速恢复 精度设置，具有道具破损检测功能； 11.具有ATC功能，即加工任务快速编程参数选择；
12. 30刀位刀库；
13.具有冷却喷枪，可通过M功能实现实现气吹转换；
控制单元（CC）最新的设计中集成了控制系统的所有伺 服控制回路（位置环/速度环/电流环），所有的伺服计 算都在DSP（数字信号处理器）中完成。从而测量元件 的反馈均集成在控制单元上。其优势在于：保证伺服计 算快速和实时要求，减小各伺服回路周期，减少各个回 路间的通讯延迟，可在位置回路实现高增益，实现高速 和高表面质量加工，并可很好地控制直接驱动（直线电 机和力矩电机）。 驱动配套：海德汉公司可以根据需要提供全套的iTNC 530数控系统。同时，海德汉数控系统还具有很好的开 放性能，能够连接第三方的变频器或电机，从组成全套 系统数字系统。由于iTNC 530特殊的控制单元设计，所 有的伺服运动控制均在控制单元中实现，其输出为数字 PWM信号，因而后续的变频器其主要为运算放大功能。
绿色小清新公司英文产品介绍解说步骤水果介绍PPT优质模板
在这里输入您的文字内容，或者 将您的文字内容复制在这里。在 这里输入您的文字内容
团队成员
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点击输入您的内容，或者通过复制您的文本后，再此框中选择粘贴。请言简意 赅，简单说明即可，不必繁琐。点击输入您的内容，或者通过复制您的文本后
点击输入您的内容，或者通过复制您的文本后，再此框中选择粘贴。请言简意 赅，简单说明即可，不必繁琐。点击输入您的内容，或输入您的内容，或者通过复制您的文本后，再此框中选择粘 贴。请言简意赅，简单说明即可，不必繁琐。点击输入您的内容
点击输入您的内容，或者通过复制您的文本后，再此框中选择粘 贴。请言简意赅，简单说明即可，不必繁琐。点击输入您的内容
输入标题
项目介绍
PROJECT INTRODUCTION
前期调研
点此编辑标题 01 在此输入详细文字介绍和详细信
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企业理念
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欧陆直流驱动器基础知识培训(共26张PPT)
2、工作原理
电枢电压，200 伏 励磁电流，5.7A
速度由 于弱磁 而增加
电枢电压保持恒定
励磁电流降低
基本速度பைடு நூலகம்
速度
3、部件识别
1.主调速器装置
2.端子盖
3.端子盖紧固螺丝
4.空盖子
5.6901操作站-MMI（可选）
6.通讯技术盒（可选） 7.速度反馈技术卡（可选）
8.密封板
9. 电源端子护罩
－10V基准 数字输出NO.1 (AT ZERO SPEED) 数字输出NO.2 (HEALTH)
数字输出NO.3 (READY)
程序停机 惯性滑行停机
接线组件C
C1、C2 外部控制（常闭）（常接热敏电阻，当没 有热敏电阻，需C1与C2短接）
C3 起动/运行输入端 C4 点动输入 C5 允许
C6 数字输入NO.1
方法：检查测速电机接线极性，
检查编码器符号极性不准确，
检查测速电机或编码器， 优化速度环， 检查模拟测速校准板与编码板
THERMISTOR热敏电阻故障 原因：电动机温度太高 ，电机的通风不
够。
方法：检查电机冷却风机是否有堵塞 检查电机的测温元件是否损坏。
检查TH１与TH２是否短接。
驱动器面板上绿灯不断闪烁，驱动器不能工作。 原因：驱动器未退出使能状态； 方法：操作人员检查驱动器参数是否正确，
欧陆直流驱动器基础知识培训课件
第一章、驱动器常识
1、产品代码（欧洲）
590P/591P XXXX/XXX/XXXX/XX/XXX/XXXXX/XXX/XXX
1
2
3
4 56 7
89
590p / 0015/ 500 / 0011 /UK/ARM/ 0 / 230/000
无线网络控制器,产品用户培训手册-ec7p
备注：可以通过指派不同的AP使用不同的模板（“在AP状态中进行修改”），来批量修改AP的某些公用参数。
6.MAC
MAC过滤：管理员可以通过该功能设置MAC地址进行过滤（黑名单）或允许（白名单）
7.AP
AP升级：用户可以通过该功能，对AP进行集中升级固件操作，（注意：是对AP进行升级，而不是对AC本身进行升级）。
（6）单击“属性”按键，设置计算机的IP地址。
(1)单击确定完成配置。
(2)测试计算机与无线控制器是否连通:
(3)开始 → 运行→ 键入“cmd” → 确定
(4)在命令提示符使用ping命令测试是否连通。
如果显示：
表示连接成功，若显示的是：
可能没有正确连接。
您可检查：（1）指示灯是否亮起。
（2）TCP/IP地址填写是否正确。
2.
告警日志：针对重要性操作（例如恢复出厂配置、升级等操作）以及意外状况等日志事项进行记录。
3.
安全日志：针对有关系统安全方面相关的日志事项进行记录。
4.
网络日志：针对网络相关的日志事项进行记录。
2.
显示了系统的内存负载和CPU负载，点击“服务配置”可以设置CPU阀值和内存阀值
3.
提供检测网络功能的通断项，包括PING检测和TRACERT检测，用户可以根据自己需要，选择相应功能，检测网络通断状况（下图是PING检测）。
五、网络配置
1.
点击网络配置目录下的“IP地址”，可以修改该设备的管理地址，默认的IP地址为，子网掩码为，用户可以通过点击 操作选项中的编辑按钮进行修改相关IP信息，子网，网关等信息，也可以通过 添加按钮，给设备新增IP地址。（注设备默认的IP地址只可编辑，不可以删除）
克罗韦尔 I O 扫描仪 - 通信适配器模块产品 数据表
I/O ScannerĆCommunication Adapter Module(Cat. No. 1775-S5, -SR5)Product Data2The I/O Scanner-Communication Adapter Module (Cat. No. 1775-S5,-SR5) provides high-speed communication for PLC-3 familyprogrammable controllers.With four available communication channels, you can connect eachchannel to communication devices up to 10,000 cable-feed from the PLC-3or PLC-3/10 Processor Chassis (Cat. No. 1775-A1, -A2, -A3).The features, benefits, and functions are outlined below:Table A Scanner Features and FunctionsFast and ConvenientCommunications3The scanner is a required module for PLC-3 family controllers. When youare setting up your system, you must have one scanner in the processor chassis with its thumbwheel set to one:PLC-3 modules and PLC-3/10 modules are not interchangeable.WARNING: Remove system power before removing orinserting the scanner into processor chassis. Failure to observethis warning could result in damage to processor components and/or undesired operation with injury to personnel.The scanner provides four separate communication channels that you can use to communicate with one of the following:I/O adapters (Cat. No. 1775-AS, -ASB) for I/O communicationa scanner in a backup PLC-3 or PLC-3/10 processor for backupcommunicationup to six PLC-3 or PLC-3/10 processors for peer-to-peercommunicationFor channel 4, you can communicate with one of these or one of the following:up to 64 stations on a Data Highway or PCLthe industrial terminal (Cat. No. 1784-T50) for programming interface if you configure the channel for PCL communicationYou can operate a 1775-S5 scanner with a 1775-S4A, -S4B scanner in a PLC-3 system and a 1775-SR5 with a 1775-SR scanner in a PLC-3/10system. However, note the following cautions.Using the Scanner4CAUTION: When using scanners:Use of backup or peer-to-peer communications requires that a 1775-S5, -SR5 scanner not be connected to a 1775-S4A,-S4B, or -SR scanner.You can replace a 1775-S4A, -SR scanner with a 1775-S5,-SR5 scanner. However, do not replace a 1775-S5, -SR5scanner with a 1775-S4A, -S4B, or -SR scanner.Failure to observe these cautions could result in equipment damage and/or undesired operation.The scanner provides terminal connections for four separate I/O communication channels. These channels communicate with I/O adapter modules in I/O chassis. In scanning these I/O channels, the scanner:reads the status of output image table words from the processor data table and updates the status of the corresponding output I/O groups.reads the status of the input I/O groups and writes this data into the processor input image table word.You can connect up to 16 I/O adapters on a single I/O channel. Through the LIST function, you can select the sequence that the scanner scans the I/O chassis. If an I/O chassis requires a faster update time, you can list the chassis more than once in the sequence.Important: If you are using a Data Highway or PCL channel, then you cannot use channel four for I/O communication.Through LIST selections for the scanner, you can configure an I/O channel for backup communication. In this configuration, an I/O channel on a scanner in the primary processor is connected to an I/O channel on a scanner in the backup processor. An input file receives data from the backup processor. An output file sends data to the backup processor.The scanner also features a backup connector for installing a hot backup system. By cabling between the connectors labeled BACK UP on a number one scanner in the primary processor chassis and a number one scanner in the backup processor chassis, you can set up a hot backup system. In this system, if a fault disables the primary processor, the backup processor can take control of the outputs.I/O Scanning InterfaceBackup Communication5Peer-to-peer communication allows PLC-3 and PLC-3/10 processors to exchange data such as part counts and production status information without connecting to a Data Highway or PCL.Through LIST selections for the scanner, you can configure an I/O channel for peer-to-peer communication. In this configuration, you connect the I/O channel of a scanner in one processor to an I/O channel on a scanner in each of up to six PLC-3 or PLC-3/10 processors. You must designate on processor as the master of the communication channel. The other processors on the channel act as slaves.In peer-to-peer communication, the master communicates with each slave.You select a separate file in the master processor for each slave. This file is the source for data that transfers to the slave processor(s). You also select a file in each slave processor that receives the data.Conversely, you select a file in the master processor for each slave that is the destination for data that transfers form the slave processor(s). You also select a file in each slave processor that contains the source data.The Allen-Bradley Data Highway and Peer-Communication-Link areindustrial communication networks that link together as many as 64distinct stations. Each station can be a programmable controller (PLC-3,PLC-3/10, PLC-5, etc.), a computer, or an intelligent device (Advisor2+system, 1784-T50 industrial terminal, etc.). The central trunkline of a Data Highway or PCL can be up to 10,000 feet long, and each station can be as far as 100 feet away from the trunkline (Figure 1).PeerĆtoĆpeer CommunicationData Highway/PCL Communication6Figure 1Typical Data Highway or PCL ConfigurationThe difference between the communication links is the means of communication. The Data Highway uses a floating master function to handle communication between stations. This function allows a station to access the Data Highway based on three factors:station’s readiness to transmit a messagemessage prioritystation numberIn this way, the floating master function prevents any single station from “hogging” the Data Highway, and it enables the Data Highway to continue functioning even if some of the stations become disabled.The PCL uses a token passing function to handle communication between stations. The token is constantly passed from station to station even if no messages are sent. Each station obtains time to send a message. A station becomes master when it obtains the token and sends a message to another station. When a station is through communicating, the token automatically passes to the next higher station number on the link.PCL is faster than Data Highway when the PCL has 16 stations or less. The delay time for link access increases as you increase the number of stations on a PCL.Through LIST selections or scanner dip switch settings, you can configure channel four for Data Highway or PCL communication. In this configuration, the scanner disables the terminals corresponding to channel four and enables the Data Highway/PCL connectors on its front edge. Data Highway/PCL ProgrammingThe scanner communicated data by sending and receiving messages through its Data Highway/PCL connectors. To control and transmit these messages, you use the message (MSG) instruction in the ladder-diagram program (Figure 2).The scanner executes the single command or the message procedure listed in the MSG instruction and returns the appropriate status information to the MSG block in the ladder-diagram program.78Figure 2Example Message InstructionYou can have up to:15 1775-S5 scanners in a PLC-3 system for a total of 8,192 I/O2 1775-SR5 scanners in a PLC-3/10 system for a total of 4,096 I/OEach additional scanner provides three I/O communication channels and afourth channel that you can use for I/O, Data Highway, or PCLcommunication.When inserting additional scanners, set each thumbwheel consecutively,starting with 2.Important: For the PLC-3/10 controller, using an additional scanner doesnot increase I/O capacity. You can communicate at up to 4,096 I/O. Additional Scanners9Your scanner fits into the PLC-3 or PLC-3/10 processor chassis andconsists of the following hardware components (Figure 3):Figure 3Hardware Features on the ScannerElectrostatic DischargeUnder some conditions, electrostatic discharge can degrade performance or damage the module. If you observe the following precautions, you can guard against electrostatic damage.Touch a grounded object to rid yourself of charge before handling the module.Do not touch the backplane connector or connector pins.When not in use, keep the module in its static-shielded bag.Hardware Features10For detailed information on using the scanner, refer to the:FunctionsI/O communicationData Highway communicationPeer-Communication-Link (PCL) communicationbackup communicationpeer-to-peer communicationfront-panel supportLocation1775-S5 – single slot in a PLC-3 chassis1775-SR5 – single slot in a PLC-3/10 chassisI/O Capacity per Scanner2,048 I/O (any mix)4,096 I/O (complementary)Communication Rates (in kbaud)57.6 at 10,000 cable feet (DH, PCL, I/O)115.2 at 5,000 cable feet (I/O only)CablingTwinaxial Cable (Cat. No. 1770-Cd) for I/O, DH, or PCL communication channelsIndustrial Terminal T50 Cable (Cat. No. 1784-CP5) for PCL communication to 1784-T50 industrial terminalRelated Publications SpecificationsNominal Scan I/O Times per I/O Adapter at 115.2 kbaud4.5ms for 1 channel5ms for 2 channels5ms for 3 channels6.5ms for 4 channels8ms for 3 channels + Data Highway9ms for 3 channels + PCLBackplane Current6.0A maximum from ±5V DC20mA maximum from ±15V DCEnvironmental ConditionsOperating Temperature: 0 to 60°C (32 to 140°F)Storage Temperature: -40 to 85°C (-40 to 185°F)Relative Humidity: 5 to 95% (without condensation)1112With offices in major cities worldwideWORLD HEADQUARTERS Allen-Bradley 1201 South Second Street Milwaukee, WI 53204 USA Tel: (414) 382-2000Telex: 43 11 016FAX: (414) 382-4444EUROPE/MIDDLE EAST/AFRICA HEADQUARTERS Allen-Bradley Europa B.V .Amsterdamseweg 151422 AC Uithoorn The Netherlands Tel: (31) 2975/60611Telex: (844) 18042FAX: (31) 2975/60222ASIA/PACIFIC HEADQUARTERS Allen-Bradley (Hong Kong)Limited Room 1006, Block B, Sea View Estate 28 Watson Road Hong Kong Tel: (852) 887-4788Telex: (780) 64347FAX: (852) 510-9436CANADA HEADQUARTERS Allen-Bradley Canada Limited 135 Dundas Street Cambridge, Ontario N1R 5X1Canada Tel: (519) 623-1810FAX: (519) 623-8930LATIN AMERICA HEADQUARTERS Allen-Bradley 1201 South Second Street Milwaukee, WI 53204 USA Tel: (414) 382-2000Telex: 43 11 016FAX: (414) 382-2400As a subsidiary of Rockwell International, one of the world’s largest technology companies — Allen-Bradley meets today’s challenges of industrial automation with over 85 years of practical plant-floor experience. More than 13,000 employees throughout the world design, manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality, productivity and time to market. These products and services not only control individual machines but integrate the manufacturing process, while providing access to vital plant floor data that can be used to support decision-making throughout the enterprise.Publication 1775-2.24 – August 1992Supersedes Publication 1775-2.14 – August, 1987PN 955101-32Copyright 1992 Allen-Bradley Company, Inc. Printed in USA。
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Slide 1-3
1.1E-commerce Trends 2010-2011
Social networking（社会网络化）continues to grow Social e-commerce platform emerges
Online consumer sales （消费品销售）return to growth
Slide 1-15
1.1.9Origins & Growth of Ecommerce Precursors:早期
Baxter Healthcare –b2b雏形 Electronic Data Interchange (EDI) -20世纪80年代形成
French Minitel (1980s videotex system)-可视数据系统
Saturation and ceiling effects-饱和度和天花板效应
Business-to-Consumer (B2C) 京东 苏宁 Business-to-Business (B2B) 机电在线 Consumer-to-Consumer (C2C) 淘宝，孔夫子旧书网
Classified by technology used
Peer-to-Peer (P2P)宜人贷等网贷平台 Mobile commerce (M-commerce)-移动商务 手机APP
Slide 1-13
1.1.8The Web-万维网
Most popular Internet service-流行的
Developed in early 1990s Provides access to Web pages –提供网页链接
HTML documents that may include text,
E.g. Twitter, YouTube, Facebook, Second Life,
Wikipedia, Digg ， qq空间，微信，新浪微博， 珍爱等
Slide 1-10
1.1.7Types of E-commerce
Classified by market relationship
Automobiles-汽车 Radio-无线电
E-commerce growth will eventually cap as it confronts its own fundamental limitations.
Slide 1-19
1.1.11Potential Limitations on the Growth of B2C E-commerce
First 16 years of e-commerce（94年开始）
Just the beginning Rapid growth and change
Technologies continue to evolve at
exponential rates
Disruptive business change-对传统行业的破坏
E-commerce: business. technology. society.
E-commerce
business. technology. society.
Global Edition
seventh edition
Kenneth C. Laudon
Carol Guercio Traver
Copyright © 2011 Pearson Education, Ltd.
New opportunities-2050年大部分商务将是电商
Slide 1-5
1.1.2What is E-commerce?
Use of Internet and Web to transact
business
More formally:
Digitally enabled commercial transactions
Slide 1-11
1.1.8The Internet
Worldwide network of computer networks built on common standards-通用标准
Created in late 1960s Services include the Web, e-mail, file transfers, etc. Can measure growth by looking at number of Internet hosts with domain names
Expensive technology –昂贵技术费用 Sophisticated skill set –复杂技术 Persistent cultural attraction of physical markets and traditional shopping experiences Persistent global inequality limiting access to telephones and computers-普及失衡
1. 2.
3.
4. 5.
6.
7. 8.
Ubiquity –普遍存在 Global reach –影响遍及全球 Universal standards –通用标准 Information richness –丰富信息 Interactivity –互动性 Information density-信息密度 Personalization/customization个性化/定制化 Social technology-社交技术
None had functionality of Internet-无法与互联网功能比
1995: Beginning of e-commerce
First sales of banner advertisements-出售旗帜广告空间
E-commerce fastest growing form of commerce in United States
Spider Webs, Bow Ties, Scale-Free Networks, and the Deep Web
Class Discussion
What is the “small world” theory of the Web? What is the significance of the “bow-tie” form of the Web? –重要性 Why does Barabasi巴拉巴斯 call the Web a “scale-free network” with “very connected super nodes”?
Mobile computing begins to rival PC
Explosive growth in online video viewing
Continued privacy and security concerns
Slide 1-4
1nsumer-被动消费
Sales-force driven-销售里驱动 Fixed prices-固定价格
Information asymmetry-信息不对称
Slide 1-8
1.1.5Unique Features of Ecommerce Technology
Does not include
Slide 1-7
1.1.4Why Study E-commerce?
E-commerce technology is different, more powerful than previous technologies-不同
E-commerce bringing fundamental changes to commerce-提供基础 Traditional commerce:
between and among organizations and individuals-数字方式
Slide 1-6
1.1.3E-commerce vs. E-business
E-business:
Digital enablement of transactions
and processes within a firm, involving information systems under firm’s control—企业内部的交易和流程 commercial transactions involving an exchange of value across organizational boundaries—不超过企业边界的交易
Figure 1.5, Page 28
SOURCES: Based on data from U.S. Census Bureau, 2010; authors’ estimates.
Slide 1-18
1.1.10Technology and Ecommerce in Perspective
The Internet and Web: Just two of a long list of technologies that have greatly changed commerce
Class Discussion
Do you use Facebook, and if so, how often? What has the experience been like? Have you purchased anything based on an advertisement on Facebook or by using a link provided by a friend? Are you concerned about the privacy of the information you have posted on Facebook?