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Khamis, 11 Jun 2009
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Embedded System
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Embedded SystemAn embedded system is a special-purpose computer system designed to perform one or a few dedicated functions, often with real-time computing constraints. It is usually embedded as part of a complete device including hardware and mechanical parts.
Embedded systems span all aspects of modern life and there are many examples of their use:
Telecommunications systemsEmploy numerous embedded systems from telephone switches for the network to mobile phones at the end-user.
Computer networking Uses dedicated routers and network bridges to route data.
Consumer electronics Include personal digital assistants, mp3 players, mobile phones, video game consoles, digital cameras, DVD players, GPS receivers, and printers.
Many household appliances, such as microwave ovens, washing machines and dishwashers Are including embedded systems to provide flexibility, efficiency and features.
Advanced H VAC systems Use networked thermostats to more accurately and efficiently control temperature that can change by time of day and season.
Home automationUses wired and wireless-networking that can be used to control lights, climate, security, audio/visual, surveillance, etc., all of which use embedded devices for sensing and controlling.
Isnin, 1 Jun 2009
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E-Commerce
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E-commerceE-Commerce is the buying and selling of products or services over electronic systems such as the Internet and other computer networks.The use of commerce is conducted in this way, spurring and drawing on innovations in electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange, inventory management systems, and automated data collection systems. Modern electronic commerce typically uses the World Wide Web at least at some point in the transaction's life cycle, although it can encompass a wider range of technologies such as e-mail as well.
A large percentage of electronic commerce is conducted entirely electronically for virtual items such as access to premium content on a website, but most electronic commerce involves the transportation of physical items in some way. Online retailers are sometimes known as e-trailers and online retail is sometimes known as e-tail. Almost all big retailers have electronic commerce presence on the World Wide Web.
Electronic commerce that is conducted between businesses is referred to as business-to-business or B2B. B2B can be open to all interested parties (e.g. commodity exchange) or limited to specific, pr-qualified participants (private electronic market). Electronic commerce that is conducted between businesses and consumers, on the other hand, is referred to as business-to-consumer or B2C. This is the type of electronic commerce conducted by companies such as Amazon.com.
Electronic commerce is generally considered to be the sales aspect of e-business. It also consists of the exchange of data to facilitate the financing and payment aspects of the business transactions.
Jumaat, 1 Mei 2009
about:
Computer Radiation
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Computer Radiation
Studies show that long-term exposure to radiation increases the risk of all forms of cancer, tumors, blood disorders, miscarriage, headaches, insomnia, anxiety, aging of the skin, skin burn, etc.
A television, microwave oven, cellular phone and computer are examples of products that emit radiation. To preserve your health use electronic products carefully, in ways that shield your body from radiation.
A healthy solution is to use a computer accessory called a radiation filter. This product will eliminate 94-99% of the harmful radiation emitted from your computer screen. Radiation filters are available for all types of computer monitors, and they work well to protect you from radiation.
It is also helpful to move the processor tower as far away from your body as possible. This will reduce radiation that could reach and affect your body.
The negative health effects of computer radiation are a well-known topic. There is much research on the web that explains its health hazards. But unfortunately, it is also a much avoided subject. Most people do not realize the harm that radiation can cause to the human body, even at low levels. It is also not a widely advertised problem because it would negatively affect industry and the economy as a whole.
Following this simple advice can help to preserve your health and well being:
1)Place several potted cactus beside your computer as they can effectively absorb the radiation released by the computer.
2)If possible, purchase a new computer instead of using an old model computer. Old computer in general, has more radiations released than the new one within the same distance. Its radiation is usually one to two times higher than the newly developed computer.
3)The position where you place your computer is important in reducing radiation. Do not let the back screen of your computer overlooking the place where people are walking around.
4)Take some foods which are rich in vitamin A and C such as carrots, cherries, apples, bean sprouts, tomatoes as a good measure to reduce the harmful effect of an indoor radiation.