mobile

Mobile computing:
Mobile computing is a generic term describing one's ability to use technology while moving, as opposed to portable computers, which are only practical for use while deployed in a stationaryconfiguration.Telxon PTC-710 is a 16-bit mobile computer PTC-710 with MP 830-42 microprinter42-column version. It was manufactured by the Telxon corporation since early 1990s. This one was used for example as portable ticket machine by Czech Railways (Ceské dráhy) in 1990s.Many types of mobile computers have been introduced since the 1990s, including the:Wearable computer Personal digital assistant/Enterprise digital assistant Smartphone Carputer Ultra-Mobile PC Contents 1 Technical and other limitations of mobile computing 2 Mobile computing: in-vehicle computing and fleet computing 3 Portable computing devices 4 See also Technical and other limitations of mobile computingInsufficient bandwidth Mobile internet access is generally slower than direct cable connections,using technologies such as GPRS and EDGE, and more recently 3G networks. These networks are usually available within range of commercial cell phone towers. Higher speed wireless LANs are inexpensive, but have very limited range.Security standards When working mobile one is dependenton public networks, requiring careful use of VPNs.Power consumptionWhen a power outlet or portablegenerator 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. 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.Potential health hazards More car accidents are related to drivers who were talking through a mobile device. Cell phonesmay interfere with sensitive medical devices. There are allegations that cell phone signals may cause health problems. Human interface with device Screens and keyboards tend to be small, which may make them harder to use. Alternate input methods such as speech or handwriting recognition require training.GH Forman, J Zahorjan - Computer, 1994 -doi.ieeecomputersociety.org David P. Helmbold, "A dynamic disk spin-down technique for mobile computing", citeseer.ist.psu.edu, 1996 MH Repacholi, "health risks from the use of mobile phones", Toxicology Letters, 2001 - Elsevier Landay, J.A. Kaufmann, T.R., "user interface issues in mobile computing", Workstation Operating Systems,1993. Imielinski, BR Badrinath "mobile wireless computing, challenges in data management- Communications of the ACM, 1994 - portal.acm.org