Mobile information systems are often distinguished as traditional information systems with additional support for mobile devices. This idea is based on the mostly used cellular network architecture. Mobile units have to be wirelessly connected via a base station to a server integrated in a fixed network if their users want to use the capabilities of the information system which are provided by ...

With close to 1.5 billion cellular handsets in use and worldwide sales last year of over 500 million units, mobile phones are by far the most prevalent mobile device. Second only to the mobile phone, the MP3 player is the most visible and influential mobile device. Candidates to convergence with the mobile phone, such as the SonyEricsson W800c Walkman, indicate the significant impact the techno...

This paper presents a two-phase handoff management scheme for synchronization algorithms of wireless multimedia systems. This scheme allows mobile hosts to receive multimedia units without delivery interruption while they are moving from one cell to another cell. The messages passing among mobile hosts, base station and servers include a time stamp to compute delay time for each multimedia unit...

Selection combining is considered for upgrading the performance of mobile units in wireless networks. Three upgrade schemes are considered: 2 antennas array, 3 antennas array in circular geometrical setting and 3 antennas in linear geometrical setting. The problem of diversity loss due to antennas proximity is addressed and an approach for decreasing the loss is proposed. The approach is based ...

The object of survey was to assess which aspects of the nurses' work in mobile clinics could be computerised with a beneficial effect on the quality of work. This paper is an analysis of how much time the nursing staff spent on various tasks. The results show that nurses are satisfied with their work, even in the face of difficult working conditions and a high workload. It was also found that c...

Energetic autonomy of a hydraulic-based mobile robot requires a power source capable of both hydraulic and electrical power generation. The hydraulic power is used for locomotion and the electric power is used for the control computer, sensors and other peripherals. In addition, the power source must be lightweight and quiet. This study presents several designs of internal combustion engine-bas...

Airport system is complex. Passenger dynamics within it appear to be complicate as well. Passenger behaviours outside standard processes are regarded more significant in terms of public hazard and service rate issues. In this paper, we devised an individual agent decision model to simulate stochastic passenger behaviour in airport departure terminal. Bayesian networks are implemented into the d...

We present four eecient heuristics (one basic scheme and three of its variants) to predict the location of a mobile user in the cellular mobile environment. The proposed location management schemes assume a hierarchy of location areas, which might change dynamically with changing traac patterns. A method to compute this hierarchical tree is also proposed. Depending on the proole of the user mov...

Oasis is a memory-based storage system designed to support collaborative mobile computing applications. These applications require peer-to-peer and client-server interactions in conditions of less than ideal network connectivity. The architecture is based on a memory model where the address space is logically partitioned into regions used for sharing. Mobile units may disconnect from the backbo...

This paper describes KPNM’s (Knowledge Processing and Networked Manufacturing lab at Hunan University of Science and Technology) participation in the Mobile Information Access ("MobileClick") task at the NTCIR-11. We chained simple techniques based on statistical models and heuristic rules to extract significant text units from the web pages retrieved by the given query. Then we ranked the text...