Datacom-Chapter 3

Data and Signals

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* Data must be transformed into electromagnetic signals prior to transmission across a network.

* Data and signals can be either analog or digital.

* A signal is periodic if it consists of a continuously repeating pattern.

* Each sine wave can be characterized by its amplitude, frequency, and phase. 

IBM DB2 ACADEMIC ASSOCIATE TRAINING

I made it ! I passed the Certification Exam. After the four days rigid and intensive training, it yield to a fruitful endeavor. My success is dedicated to my beloved institution,  Northern Bukidnon Community College and to my Students...

Chapter 2 - Information Systems in the Enterprise

Key System Applications in the Organization

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Since no single system provides all the information an organization needs, a number of systems have been developed to serve different organizational levels and functions. Operational, knowledge, management and strategic-level systems are designed to meet a variety of different information needs.

          Different levels in an organization have different interests and needs. See Figure 2-1. 

Chapter 1 - Managing the Digital Firm

Why Information Systems?

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Information System have taken on a vital role in the competitive global marketplace because of powerful worldwide changes in the business environment. Leading industrial countries are transforming from industrial-based to knowledge-and information-based economies. Knowledge and information work now account for 60 percent of the American gross national product, and nearly 55 percent of the U.S. labor force. See Figure 1-1.

Introduction to ComOrg

 WHY STUDY COMPUTER ORGANIZATION AND ARCHITECTURE?

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1. Suppose a graduate enters the industry and is asked to select the most cost-effective computer for use throughout a large organization. An understanding of the implications of spending more for various alternatives, such as a larger cache or a higher processor clock rate, is essential to making the decision.

2. Many processors are not used in PCs or servers but in embedded systems. A designer may program a processor in C that is embedded in some real-time or larger system, such as an intelligent automobile electronics controller. Debugging the system may require the use of a logic analyzer that displays the relationship between interrupt requests from engine sensors and machine-level code.

3. Concepts used in computer architecture find application in other courses. In particular, the way in which the computer provides architectural support for programming languages and operating system facilities reinforces concepts from those areas

MySpace Case Study

MySpace taps big data for turnaround

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As visitor traffic wanes, the social networking site has turned to massively parallel database analytics to get inside the minds of its members

MySpace was one of the first social networks to penetrate mainstream consciousness, and between 2006 and 2008 it had more members than any other. In July 2005, the site was acquired by News International for $580 million, and celebrated its 100 millionth member soon after.
Since then, however, MySpace has been rather eclipsed by rival Facebook. According to web traffic analysis site Compete.com, Facebook attracts around 120 million unique visitors per month and is still growing, while MySpace’s monthly figure of around 70 million visitors per month is gradually falling.

A&P Case Study

Can A&P Renew Itself with New Information Systems?

Is A&P, the most famous supermarket chain in the United States, about to disappear? Maybe, but if it happens, it won't be immediately because management is fighting hard to survive. The Great Atlantic & Pacific Tea Co. (A&P's official name), headquartered in Montvale, New Jersey, had about 750 stores in 16 states, Washington D.C., and Ontario, Canada. These stores include the A&P chain but also the Food Emporium, SuperFresh, and Waldbaum's chains. They have about 24,400 full-time employees plus 56,600 part timers. 

Datacom - Chapter 1

Introduction




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* Data communication is the transfer of data from one device to another via some form of transmission medium.

* A data communications system must transmit data to the correct destination in an accurate and timely manner.

* The five components that make up a data communications system are the message, sender, receiver, medium, and protocol.

* Text, numbers, images, audio, and video are different forms of information.

* Data flow between two devices can occur in one of three ways: simplex, half-duplex, or full-duplex.

* A network is a set of communication devices connected by media links.

* In a point-to-point connection, two and only two devices are connected by a dedicated link. In a multipoint connection, three or more devices share a link.