Asaph

  Ss2 TOPIC: INTRODUCTION TO THE WORLD WIDE WEB Introduction The world wide web, or web is a very large set of specially formatted documents that are interlinked and can be accessed through the internet. It is a way of accessing information over the medium of the internet. WWW A technical definition of the World Wide Web is: all the resources and users on the internet that are using the Hypertext transfer protocol (HTTP). Web inventor Tim Berners-Lee founded the World Wide Web consortium (W3C): “The World Wide Web is the universe of network-accessible information, an embodiment of human knowledge. WEBSITE A website, also written as web site is a set of related web pages containing content such as text, images, video, audio etc. a website is hosted on at least one web server, accessible via a network such as the internet or private local area network through an internet address known as a Uniform Resource Locator (URL). All publicly accessible websites collectively con...

  Ss1 TOPIC:   COMMUNICATION SYSTEM III Introduction Various computer network configurations are possible depending on the needs of an organization. Local area networks (LAN) joins computers at a particular site, such as an office building or an academic campus. Metropolitan area networks (MAN) cover a limited densely populated area. Wide area networks (WAN) connects widely distributed data centers frequently run by different organizations. GSM: Global System for Mobile communications is a digital cellular phone technology which started in Europe and migrated to other continents. The SIM card GSM phones use a Subscriber Identity Module (SIM) smart card that contains user information.   PAN: this is a computer network organized around an individual person. Personal area networks typically involve a mobile computer. A cell phone or a handheld computing device such as a PDA. Personal networks generally cover a range of less than 10meters (about 30 feet). PAN can be...

  Jss3 TOPIC:   INFORMATION STORAGE AND RETRIEVAL II Introduction File organization could be defined as the method in which data or record is held on a file with the view of how they are accessed and retrieved. Types of file organization methods 1.      Serial 2.      Sequential 3.      Index 4.      Direct access Serial method: serial file organization can also be called unordered file organization. A file is said to have and unordered organization if the records held or stored in any particular order or sequence on the file. Records are stored as they arrive on first come first serve principle. Sequential method: this involves arranging of records in a particular sequence according to their field e.g. in alphabetical or numerical order. For example, student’s registration is done in this manner and the intake of new students might mean the whole file would be written all over...

Jss1 TOPIC:  MASTERY OF THE KEYBOARD II Introduction we shall again be looking further into the usage of the computer keyboard and basic shortcuts that are necessary for carrying out operations on the computer.   Uses of the keyboard 1.      The keyboard helps to send data or information into the system unit inform of digital code signals. 2.      The keyboard helps to pass command or sends command to the system unit. 3.      The arrow keys on the keyboard and some other keys can be used in playing computer games. 4.      The internet keyboard has special keys like the email lunch, browser lunch that supports large range of internet applications to enhance easy access to the internet.     Shortcut keys Functions Alt + Tab Switch between open application F2 Rename selected icon F3 ...

  Ss2 TOPIC:   HANDLING COMPUTER FILES II Introduction This is the concept that a file is always vulnerable and is prone to be lost or missing in the computer. File security is a feature of your file system which controls user access and places limitation to what users can do to various files on your computer. Effect of file security 1.      Loss of data: computer users and experts often experience data loss when files are destroyed and sometimes there is no hope of recovery and this is as a result of files being tempered with on the computer or through virus invasion or sudden crash of the operating system. 2.      Overwriting: this is a process of writing a binary set of data on a memory data that has been overwritten. This is generally considered to be unrecoverable. 3.      Dis-orientation of the file system: as a result of someone tempering with the computer system, there may be displacement of fi...

  Ss1 TOPIC:   COMMUNICATION SYSTEM II Introduction Major advances in the field of broadcasting, communication and information technology (IT) during the last decade has had a great impact on the information and broadcasting sector. Types of ICT The following are the types of ICT 1.      Broadcasting 2.      Telecommunication 3.      Information system 4.      Satellite communication Broadcasting: it is the distribution of radio and video content to a dispersed audience via any audio or visual mass communication medium, but usually one using electromagnetic radiation radio waves. It is a method of transmitting signals such as radio or television programs to relatively large group of recipients. Telecommunication: is the assisted transmission of signals over a distance for the purpose of communication. In earlier times, this might have involved the use of smoke signals, drums, ...

  Jss3 TOPIC:   INFORMATION STORAGE AND RETRIEVAL Introduction   Storage is one of the greatest attributes of the computer system. Storage is needed in all the stages, be it input, processing or output. For the computer to perform computation, the instructions needed to carry out this task are stored somewhere it would be fetched from. Information storage It involves the process of keeping data and information in a storage device for future use, for documentation purpose, for reference purpose for re-usability or for transfer purpose. Types of Data File Basically, files can be divided into three, based on the type of data that they store. They include: 1.      Data files 2.      Application file 3.      System file   Data File: these are files that are generated when an application is used. For example, the document file generated from using Microsoft word, excel, chat history on F...