Friday, February 11, 2011

CHAPTER 6: THE SYSTEM UNIT

SYSYEM UNIT
  • known as " sysyem chassis".
  • container of electronic component that make up computer system.
  • 4 basic types:
        ~Desktop contain the system's electronic components and selected secondary storage. Input and output devices are located outside of system unit.
http://www.techshout.com/hardware/2008/13/acer-aspire-3450-desktop-launched-in-the-indian-market/


        ~Notebook are much smaller and portable.It often called laptops.The monitor is attached by hinges.

http://hi.baidu.com/wangzhiyun85/blog/item/793fd6180628b80035fa4142.html


        ~Table PC are highly portable devices that support stylus tp input commands and data. (a)Accepts stylus input and has monitor swivels and folds onto its keyboard.

http://www.tabletpc2.com/Archives/2005%20Archives/News-Archive-December-2005.htm

                 (b)Has removable keyboard
http://techsupport24hours.com/tech-support-for-asus-eee-pc-t91/

   
        ~Handheld is the smallest and designed to fit into the palm of one hand.The most widely used handheld computers are personal digital assistants(PDAs) and smartphones.


BINARY CODING SCHEMES
  • convert binary data into characters.
  • 3 such schemes:
        ~ASCII-the most widely used for microcomputers.
        ~EBCDI-developed by IBM ,used primarly by large computers.
        ~Unicode -16bit code support both ASCII and EBCDI codes and internationallanguages.


SYSTEM BOARD
  • known as motherboard.
  • connects all system components and allows input and output devices to communicate with system unit.
  • a flat circuit board covered with these electronic components including:
        ~Sockets provide connection points for chips.A chips is also called silicon chip,semiconductor,or integrated circuit.
        ~Slots provide connection points for specialized cards or circuit boards.
        ~Bus lines provide pathways that support communication.

http://computer.yourdictionary.com/slot-1


MICROPROCESSOR
  • is a single chip that contains the central processing unit(CPU).
  • 2 basic components:
        ~Control Unit tells the computer system hoe to carry out program instructions.
        ~Arithmetic-logic unit(ALU)performs logical and arithmetic operations.       

http://www.shutterstock.com/pic-8145061/stock-photo-close-up-of-microprocessor-chip-on-motherboard-in-computer.html



MEMORY
  • is a holding data,instructions,and information.
  • 3 types momory chips:
        ~RAM is called temporary or volatile storage because their contents are lost if power is disrupted.
   (a)Cache memory-a high speed holding area for frequently used data and information.
   (b)DIMM-to expand memory.
   (c)virtual memory-divides large programs into parts that are read into RAM as needed.
http://www.tomshardware.com/reviews/ram-scaling-notebook,1920-6.html


        ~ROM are nonvolite storage and control essential system operations.

        ~Flash Memory is a type of memory that does not ose it contents when power is removed.it is used to store information about a computer's configuration.



*** Information is getting from the book - Computing Essential 2011



 












Wednesday, February 2, 2011

CHAPTER 4 SPECIALIZED APPLICATION SOFTWARE

Specialized Applications
~Graphics programs for creating professional-looking published documents, for creating   and editing images, and for locating and inserting graphics.
~Audio and video software to create, edit, and play music and videos.
~Multimedia programs to create dynamic interactive presentations.
~Web authoring programs to create, edit, and design Web sites.
~Artificial intelligence, including virtual reality, knowledge-based systems, and robotics.

Graphics 
~Professionals in graphic arts use specialized graphics programs.

Desktop Publishing
~Desktop publishing programs, or page layout programs, allow you to mix text and graphics to create publications of professional quality.
~Professional graphic artists use desktop publishing programs to create documents such as brochures, newsletters, newspapers, and textbooks.
~Eg. Adobe InDesign, Microsoft Publisher, and QuarkXPress.



Adobe InDesign

Image Editors
~Bitmap images, also known as raster images, one of the most common types of graphic files,  use thousands of dots or pixels to represent images.
~Image editors, also known as photo editors, are specialized graphic programs for editing or  modifying digital photographs.
~Eg. Adobe Photoshop, Corel Paint Shop Pro, and Paint.Net.
Adobe Photoshop

Illustration Programs
~Vector images, also known as vector illustrations, another common type of graphic file, use geometric shapes or objects.
~Illustration programs, also known as drawing programs, are used to create and edit vector  images.
~Eg. Adobe Illustrator, CorelDRAW, and Inkscape.
CorelDRAW

Image Galleries
~Image galleries are libraries of electronic images.
~Two basic types of electronic images:
  -Stock Photographs ( Photographs on a variety of subject material from people to landscape.)
  -Clip Art ( Graphic illustrations representing a wide range of topics. Most applications provide access to a limited selection of free clip art. )


Graphics Suites 
~Some companies have combined or bundled their separate graphics programs in groups called graphics suites.
~Eg. CorelDRAW Graphics Suite and Adobe Creative Suite.

CorelDRAW Graphics Suite


Audio and Video
~Recent advances in video and audio technology allow individuals to assemble near- professional-quality video and audio footage.


Video editing software
~Allow to reorganize, add effects, and more to your digital video footage.
~Eg. Apple iMovie and Window Movie Maker.

Apple iMovie

Audio editing software
~Allow to create and edit audio clips.
~Eg. Apple GarageBand and Sony ACID.

Apple GarageBand


Multimedia
~Multimedia is the integration of all sorts of media into one presentation.
~Effective multimedia presentations incorporate user participation or interactivity.
~Interactivity allows user to choose the information to view, to control the pace and flow of  information, and to respond to items and receive feedback.
  
Links and Buttons
~Pages in multimedia presentation preseinformation, and to respond to items and receive feedback.
~By clicking special areas called buttons on a page, you can make appropriate links and navigate through a presentation to locate and discover information.

   
Multimedia Authoring Programs
~Multimedia authoring programs are special programs used to create multimedia presentations.
~Eg. Adobe Director and Toolbook.
Toolbook

Web Authoring
~Individuals create their own personal sites, called blogs.
~Creating a  site is called web authoring.
~It begins with site design followed by creation of a document file that displays the web site's content.

Web Site Design
~A Web site is an interactive multimedia form of communication
~The overall site design is commonly represented in a graphical map.
~The first page, or home page, typically serves as introduction and supplies a table of contents.
~One multimedia element found on many web sites is moving graphics called animation.

Web Authoring Programs
~Web authoring programs are typically used to create sophisticated commercial sites.
~Also known as Web page editors and HTML editors.
~WYSIWYG ( what you see is what you get )editors, which means you can build a page without interacting directly with HTML code.
~Eg. Adobe Dreamweaver, NetObjects Fusion, and Microsoft Expression.

SavedMicrosoft Expression

Artificial Intelligence
~The field of computer science known as artificial intelligence ( AI ) attempts to develop computer systems that can mimic or simulate human senses, thought processes, and actions.
~These modern applications of artificial intelligence are designed to help people and organizations become more productive.

Virtual Reality
~Virtual reality is an artificial, or simulated, reality generated in 3-D by a computer.
~It is also commonly known as VR, artificial reality, or virtual environments.
~May use virtual reality hardware including headgear and gloves.
~Some virtual reality services to be an immersive experience, allowing a user to walk into a virtual reality room or view simulations on a virtual reality wall.
Virtual Reality Wall

Knowledge-based ( Expert ) Systems
~Knowledge-based systems, also known as expert systems, are a type of artificial intelligence that uses a database to provide assistance to users.
~Many expert systems use so-called fuzzy logic, which allows users to respond to questions in a very humanlike way.

Robotics
~Robotics is the field of study concerned with developing and using robots.
~Robots are computer-controlled machines that mimic the motor activities of living things.
~Four types of robots:
  -Perception Systems ( Perception system robots imitate some of the human senses. Eg. Robots with television-camera vision system. )

Perception systems robot
  -Industrial Robots ( Industrial robots are used to perform a variety of tasks. Eg. Machines used in automobile plants to do welding, polishing, and painting. )

Industrial robot

  -Mobile Robots (Mobile robots act as transports and are widely used for a variety of different tasks. Eg. the police and military use them to locate and disarm explosive devices. )

Mobile robot

  -Household Robots ( Household robots are now widely available and are designed to vacuum or scrub  floors, mow lawns, patrol the house, or simply provide entertainment. )

Household robot



*** Information is getting from the book - Computing Essential 2011

Tuesday, February 1, 2011

CHAPTER 3 BASIC APPLICATION SOFTWARE



APPLICATION SOFTWARE
  • end-user software
  • used to accomplish a variety of tasks
  • common basic application software include word processors, spreadsheet, database management systems, and presentation graphics

    WORD PROCESSORS

    It create text-based documents and are one of the most flexible and widely used software tools. There are some examples of word processors software, which include
    •  Microsoft Word
    http://worldsdown.net/wg48/microsoft+word+2010+for+mac.html
                                  

    • Corel WordPerfect

    http://www.indiaprwire.com/pressrelease/information-technology/2010032646599.htm

    • Apple Pages
    http://appleworldnews.com/?p=442

    Features of word processors
    • word wrap = automatically moves the insertion point to the next line once the current line is full.
    • the saurus = provides synonyms, antonyms, and related words for a selected word or phrase.
    • find and replace = quickly locate and replace selected words.
    • spelling and grammar checkers = look for misspelled words and problems with capitalization, punctuation, and sentence structure.
    • font = design of the characters.
    • font size = height of a characters.
    • character effects = appearance of characters can be enhanced as bold, italic, and colors.
    • styles = enables users to quickly apply a predefined set of formatting characteristics to text in one easy step.
    • bulleted and numbered lists = makes a sequence of topics easy to read.


    SPREADSHEETS

    Spreadsheets programs organize, analyze, and graph numeric data such as budgets and financial reports. It also manipulate data and create workbook files.
    Features of spreadsheets
    • workbook files consist of one or more related worksheets.
    • worksheets, also known as spreadsheets or sheets, are rectangular grids of rows and columns, rows are identified by numbers, column by letters.
    • cells are formed by the intersection of a row and column ; used to hold text and numeric entries.text entries (labels) provide structure and numeric entries can be numbers or formulas.
    • formulas are instructions for calculations, functions are prewritten formulas.
    • range is a series of cells
    • analytical graphs (charts) represent data visually.
    • recalculation occurs whenever a value changes in one cell that affects another cell(s)
    • what-if-analysis is the process of observing the effect of changing one or more values.


    DATABASE MANAGEMENT SYSTEMS (DBMS)

    It is the program that sets up, or structures, a database. It also provides tools to enter, edit, and retrieve data from the database.
    Features of database management systems
    • relational database = organized data into related tables.
    • rows = records ; column = fields
    • a sort tools will quickly rearrange a table's records according to a selected field.
    • filter = quickly display only those records meeting the conditions you specify.
    • query = question or a request for specific data contained in a database.
    • forms = displayed on the computer monitor and typically reflect the contents for one record in a table, and it also used to enter and edit records.
    • reports = printed output in a variety of forms.



    PRESENTATION GRAPHICS

    It combine a variety of visual objects to create attractive, visually interesting presentations. They are excellent tools to communicate a message and to persuade people.

    http://downloadsoftwarestore.com/software/keyword/17853

    Features of presentation graphics
    • slides = individual pages or screens of a presentations.
    • design templates = professionally selected combination of color schemes, slide layouts, and special effects.
    • content templates = provide suggested content for each slides.
    • animation = adds action to text and graphics, transitions animate moving from one slide to the next. 


    INTEGRATED PACKAGES

    It also known as personal or home software, a single program that provides the functionality of several application packages.

    http://seattletimes.nwsource.com/html/microsoftpri0/2011826643_office_2010_microsoft_makes_a_free_version_of_its.html?syndication=rss

    Important characteristics
    • functions that typically include word processing, spreadsheets, database manager, and more. Each function is not as extensive or powerful as a single-function application program.
    • less expensive than purchasing several individual application programs and simple to use.
    • popular with home users who are willing to sacrifice some advanced features for cost and simplicity.

    SOFTWARE SUITES

    It is a collection of individual application packages sold together.

    http://www.b2b-trade.net/shops/category/Office-Suites/
    • productivity suites (office software suites or office suites) contains professional-grade applicatuon programs.
    • alternative office suites include downloadable office suites (stored on your computer) or online office suites (stored online).
    • specialized suites focus on specific application such as graphics.
    • utility suites include a variety of programs designed to make computing easier and safer


    ***Information is getting from the book - Computing Essential 2011


    Friday, January 21, 2011

    CHAPTER 2 : THE INTERNET,THE WEB, AND ELECTRONIC COMMERCE

    ELECTRONIC COMMERCE

                                                   

         http://webdevelopmentby.ifoundries.com/2009/03/the-future-of-ecommerce/                              


    (http://www.ecommerce-land.com/history_ecommerce.html)

     History of E-commerce : 

           E-commerce became possible in 1991 when the Internet was opened to commercial use. Since that date thousands of businesses have taken up residence at websites. The ability to use these technologies appeared in the late 1970s & allowed business companies & organizations to send commercial documentation electronically. In 2000 a great number of business companies in the United States & Western Europe represented their services in the World Wide Web. People began to define the term e-commerce as the process of purchasing of available goods & services over the internet using secure connections & electronic payment services. By the end of 2001, the largest form of e-commerce, Business-to-Business (B2B) model, had around $700 billion in transactions.
    Online vendors, in their turn, also get distinct advantages. The web and its search engines provide a way to be found by customers without expensive advertising campaign. Even small online shops can reach global markets. Web technology also allows to track customer preferences & to deliver individually-tailored marketing.
    History of e-commerce is unthinkable without Amazon & Ebay which were among the first Internet companies to allow electronic transactions. Thanks to their founders we now have a handsome e-commerce sector and enjoy the buying & selling advantages of the Internet. Currently there are 5 largest & most famous worldwide Internet retailers: Amazon, Dell, Staples, Office Depot & Hewlett Packard. According to statistics, the most popular categories of products sold in the World Wide Web are music, books, computers, office supplies & other consumer electronics.
    Amazon.com, Inc. is one of the most famous e-commerce companies & is located in Seattle, Washington (USA). It was founded in 1994 by Jeff Bezos & was one of the first American e-commerce companies to sell products over the Internet. After the dot-com collapse Amazon lost its position as a successful business model, however, in 2003 the company made its first annual profit which was the first step to the further development. History of e-commerce is a history of a new, virtual world which is evolving according to the customer advantage. It is a world which we are all building together brick by brick, laying a secure foundation for the future generations.

    Introduction :

           Electronic commerce also known as e-commerce,is the buying & selling of goods over the internet. It is provides incentives for both buyers and sellers. From buyer's perspective, goods & services can be purchased at any time of day @ night. E-commerce has a great deal of advantages over "brick and mortar" stores and mail order catalogs. Consumers can easily search through a large database of products and services. Customers can compare prices with a click of the mouse and buy the selected product at best prices.   Traditional commerce is typically limited to standard business hours when the sellers is open. Additionally, buyers no longer have to physically travel to the seller's location. From the seller's perspective, the costs associated with owning & operating a retail outlet can be eliminated. They can operate entirely on the Web without an actual physical store & without a large sales staff. Another advantage is reduced inventory. Traditional stores maintain an inventory of goods in their stores & periodically replenish this inventory from warehouses.

            E-commerce also brings some disadvantages including the inability to provide immediate delivery of goods, the inability to 
     "try on" prospective purchases, & security of online payments. Very few observes suggest that e-commerce will replace bricks-and-mortar businesses entirely. It is clear that both will coexist & that e-commerce will continue to grow.
           Electronic commerce involves 2 parties : businesses & consumers. There are 3 basic types of electronic commerce : Business-to-consumer(B2C), Consumer-to-consumer(C2C), & Business-to-business(B2B).

    ·           Business-to-consumer (B2C)
          Ø  used by large corporations, small corporations, and start-up business.
          Ø  the major challenges of B2C e-commerce :
                *    Getting browsers to buy things
                *    Building customer loyalty
                *    Fulfillment
          Ø  three most widely used B2C are for :
                *   online banking
                       > is the practice of making bank transactions or paying bills via   
                          internet.
                       > onlice operations include transferring funds,   applying for 
                          loans ,paying bills,and accessing account information.




    *  Online stock trading
         > allows investors to research, buy, & sell stocks and bonds over
            internet.
         > e-trading more convenient and save cost.
     



                 http://financeway247.blogspot.com/

    *  Online shopping                                                                       
         > a process wherebuy consumers directly buy goods @ 
            services from a seller in real-time, without an      
            intermediary service over internet.
        > numerical Web Sites that provide support for consumers 
           looking to compare products and to locate bargains.
                                                      


    • Consumer-to-consumer

                     Consumer-to-consumer (C2C) (or citizen-to-citizen) electronic commerce involves the electronically-facilitated transactions between consumers through some third party. A common example is the web auction, in which a consumer posts an item for sale and other consumers bid to purchase it; the third party generally charges a flat fee or commission. The sites are only intermediaries, just there to match consumers. They do not have to check quality of the products being offered.

                 >  Consumer-to-consumer (C2C) marketing is the creation of a product or service with the specific promotional strategy being for consumers to share that product or service with others as brand advocates based on the value of the product. The investment into concepting and developing a top of the line product or service that consumers are actively looking for is equatable to a Business-to-consumer (B2C) pre launch product awareness marketing spend.
                >  Examples of C2C : eBay & Craigslis
                >  This type of e-commerce is expected to increase in the future because it cuts out the costs of using another company. An example on cited in Management Information Systems, is for someone having a garage sale to promote their sale via advertising transmitted to the GPS units of cars in the area. This would potentially reach a larger audience than just posting signs around the neighborhood. In the economic downturn which commenced in 2008 C2C commerce levels increased dramatically online. eBay is basically an auction site that facilitates sales by one consumer to another.

    Two Types of Web auction:

    ·       Auction house sites – sell a wide range of merchandise directly to bidders. The auction house owner presents merchandise that is typically from a company’s surplus stock.  The are generally considered safe places to shop.
    ·       Person-to-person auction sites – operate are more like flea markets. The owner of the site provides a forum for numerous buyers and sellers to gather. As with purchases at a flea market, buyers and sellers need to be cautious.      

     

    • Business-to-business
                 >  Business-to-business (B2B) describes commerce transactions between businesses, such as between a manufacturer and a wholesaler, or between a wholesaler and a retailer. Contrasting terms are business-to-consumer (B2C) and business-to-government (B2G).
               >  The volume of B2B (Business-to-Business) transactions is much higher than the volume of B2C transactions. The primary reason for this is that in a typical supply chain there will be many B2B transactions involving sub component or raw materials, and only one B2C transaction, specifically sale of the finished product to the end customer. For example, an automobile manufacturer makes several B2B transactions such as buying tires, glass for windscreens, and rubber hoses for its vehicles. The final transaction, a finished vehicle sold to the consumer, is a single (B2C) transaction.
               >  B2B is also used in the context of communication and collaboration. Many businesses are now using social media to connect with their consumers (B2C); however, they are now using similar tools within the business so employees can connect with one another. When communication is taking place amongst employees, this can be referred to as "B2B" communication.

    Etymology :

    The term "business-to-business" was originally coined to describe the electronic communications between businesses or enterprises in order to distinguish it from the communications between businesses and consumers (B2C). It eventually came to be used in marketing as well, initially describing only industrial or capital goods marketing. Today it is widely used to describe all products and services used by enterprises. Many professional institutions and the trade publications focus much more on B2C than B2B, although most sales and marketing personnel are in the B2B sector.
               



     

    TIPS TO SHOP ONLINE
    1.Look for signs that the business is legitimate
        Buy from reputable stores and sellers. Here are some ways to    
       check:
    • Find out what other shoppers say. Sites like Epinions.com or BizRate have customer evaluations which can help you determine a company's legitimacy.
    • Look for third-party seals of approval. Companies can put these seals on their sites if they abide by a set of rigorous standards such as how personal information can be used. Two seals to look for:                            
                                     

                                                             
      Better Business Bureau Online—(BBBOnline)
                                                                 
     

    or 
              TRUSTe


    If you see the seals, click them to make sure they link to the organization that created them. Some unscrupulous merchants will put these logos on their Web sites without permission.

    2. Look for signs that the Web site protects your data

    • On the Web page where you enter your credit card or other personal information, look for an "s" after http in the Web address of that page (as shown below). (Encryption is a security measure that scrambles data as it traverses the Internet.)
    • Also make sure there is a tiny closed padlock in the address bar, or on the lower right corner of the window.

    3. Use a filter that warns you of suspicious Web sites

    Browser filters warn you about reported phishing sites and block you from visiting them. For example, two browser filters are the SmartScreen Filter in Internet Explorer 8 and the Phishing Filter in Internet Explorer 7.

    4. Keep your Web browser updated

    Internet Explorer 7 and 8 provide another layer of protection with Web sites that use Extended Validation (EV) Secure Sockets Layer (SSL) Certificates. The address bar turns green and has both https and the closed padlock.
    An EV SSL certificate not only helps ensure that communication with a Web site is secure, but it also includes information about the legitimacy of the Web site, which has been confirmed by the Certification Authority (CA) issuing the SSL Certificate.

    SECURITY
    The single greatest challenge for e-commerce is the development of fast, secure, and reliable payment methods for purchased goods. The three basic payment options are check, credit card, and digital cash.

    Ö Checks are the most traditional. Unfortunately, check purchases require the longest time to complete. After selecting an item, the buyers send a check through the mail. Upon receipt of the check, the seller verifies that the check is good. If it is good, then the purchased item is sent out. 
    Ö       Credit card purchases are faster and more convenient than check purchases. Credit card fraud, however, is a major concern for both buyers and sellers. Criminals known as carders specialize in stealing, trading, and using stolen credit cards over the Internet. 

    • Safety of Wi-Fi and Credit Card Purchases
    Reputable online merchants typically take precautions to ensure the security of their customer's credit card information. Using a Wi-Fi connection while shopping online can expose transaction and financial information to criminals if simple steps are not taken.

                                          

    Using credit cards to purchase items while using a Wi-Fi connection can be safe if simple precautions are taken.

    •  Public Wi-Fi
    Unencrypted public Wi-Fi networks can be used by criminals to monitor data and gather information to commit identity theft. A criminal may be able to set up his own Wi-Fi network with the same name as a legitimate network, and the criminal could attempt to get users to connect to his network where data traffic can be monitored. This is called a "Man in the Middle Attack."
    •  Private Wi-Fi
    Private Wi-Fi networks generally are safe to use for financial transactions provided the basic security precautions are taken. Private Wi-Fi networks should have encryption enabled. Computers used to access wireless networks should use firewall software to protect it from possible attacks, according to the online security page of the Microsoft website.


    Encryption should be used on private Wi-Fi networks to enhance data security.

    •  Virtual Private Networks
    If a credit card must be used and the only Internet connection available is a public Wi-Fi access point, the TechNet website states that a Virtual Private Network (VPN) should be used to provide another layer of data protection. 

    ***Information in getting from the book - Computing Essential 2011