Monday, March 19, 2012

 Summary of Mobile computing
Mobile computing is a generic term used to refer to a variety of devices that allow people to access data and information from where ever they are.
Mobile computing is a form of humanĂ¢€“compute r interaction by which a computer is expected to be transported during normal usage. Mobile computing has three aspects: mobile communication, mobile hardware, and mobile softwar...e. The first aspect addresses communication issues in ad-hoc and infrastructure networks as well as communication properties, protocols, data formats and concrete technologies. The second aspect is on the hardware, e.g., mobile devices or device components. The third aspect deals with the characteristics and requirements of mobile applications.
1)Insufficient bandwidth: Mobile Internet access is generally slower than direct cable connections, using technologies such as GPRS and EDGE, and more recently HSDPA and HSUPA 3G networks. These networks are usually available within range of commercial cell phone towers. Higher speedwireless LANs are inexpensive but have very limited range.
2)Security standards: When working mobile, one is dependent on public networks, requiring careful use of VPN. Security is a major concern while concerning the mobile computing standardson the fleet. One can easily attack the VPN through a huge number of networks interconnected through the line.
3)Power consumption: When a power outletor portable generator is not available, mobile computers must rely entirely on battery power. Combined with the compact size of many mobile devices, this often means unusually expensive batteries must be used to obtain the necessary battery life.
4)Transmission interferences: Weather, terrain, and the range from the nearest signal point can all interfere with signal reception. Reception in tunnels, some buildings, and rural areas is often poor.
5)Potential health hazards: People who use mobile devices while driving are often distracted from driving and are thus assumed more likely to be involved in traffic accidents.[3] (While this may seem obvious, there is considerable discussion about whether banning mobile device use while driving reduces accidents or not.[4][5]) Cell phones may interfere with sensitivemedical devices. There are allegations that cell phone signals may cause health problems.[citat ion needed]
6)Human interface with device: Screens andkeyboards tend to be small, which may make them hard to use. Alternate input methods such as speech or handwriting recognition require training.

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