The evolution of mobile computing devices and wireless networks has created a new mobile computing environment. Users equipped with a mobile host can access, retrieve, and process information while in mobility. Laptops become more powerful data processing elements. Traditional transaction model has moved forwarding to mobile transaction. This paper proposed the model with the aims at solving the stated issues. A key requirement in such an environment is to support frequent disconnection of mobile database. Transaction management models for databases, in particular the centralized databases, has long been established. Due to the nature of mobile computers, the traditional transaction management models are no longer appropriate. This paper present a model that implements this framework in an asynchronous and synchronous system.
Abstract-Telemedicine systems in Oman are not in wide use due to the shortage of expert people working in this field, and the misunderstanding of the capabilities of this technology in improving treatment with lower cost. The objective of this paper is to propose a telemedicine system "Digital Medical Center (DMC)" that covers all the cities of Oman with telemedicine facilities. DMC is a simple and easy-to-implement, and economically affordable alternative to the current systems; the aim is to improve the medical treatment in Oman and to put the advanced medical diagnosis in the world between the patient hands in Oman through the internet.The partners of this system connected by a Medical Treatment Network that based on the International Telecommunication Network and administrated by Digital Hospital which is an interface between all the hospitals in and outside Oman. This system is developed in client-server architecture with a powerful security features. The prototype design, requirements, description, and security of the system are discussed in this paper.
Recent advances in wireless communications and computer technology have provided users the opportunity to access information and services regardless of their physical location or movement behavior. In the context of database applications, these mobile users should have the ability to both query and update public, private, and corporate databases. The main goal of mobile software research is to provide as much functionality of network computing as possible within the limits of the mobile computer’s capabilities. Consequently, transaction processing and efficient update techniques for mobile and disconnected operations have been very popular. In this article, we present the main architecture of mobile transactions and the characteristics with a database perspective. Some of the extensive transaction models and transaction processing for mobile computing are discussed with their underlying assumptions. A brief comparison of the models is also included.
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