An Architectural Design of a Conference System for Mobile Terminals

Recently the demands of the Internet services for the mobile environment are rapidly increasing with the growth of the Internet. Nevertheless, the technologies for the services are just in the beginning. A few simple services are only provided as compared with the diverse services on the wire-networked Internet. The mobile devices are so handicapped in many ways that the technologies should be different with those for the desktop systems. A Small display, no keyboard, and the low bandwidth of the mobile network should be considered to develop the Internet services for the mobile environment. The Internet technologies such as mobile IP, WAP, WML, VoiceXML, and the mobile browsers are appeared for the mobile Internet services. In this paper, the mobile Internet technologies are adapted to the audio teleconference service. Because the service is one of the most important Internet services, and also the mobile devices usually have the telephone functionalities, the service is going to be the killer application of the mobile Internet services. The technologies including WML, VoiceXML, and H.323 are appropriately tailored and the architecture of the service is proposed. The architectural model is implemented in a simulated mobile environment. The mobile audio teleconference service with the WWW and ftp services is proven to be very feasible with the architecture and tailored technologies proposed in this paper.목차 Abstract = ii 제1장 서론 = 1 제2장 기반기술 연구고찰 = 4 2.1 VoiceXML(Voice eXtensible Markup Language) = 4 2.2 WML(Wireless Markup Language) = 8 2.3 H.323 (회의 시스템을 위한 표준) = 10 제3장 이동 단말기를 위한 회의 시스템 = 16 3.1 회의 시스템 구조를 위한 가정 = 16 3.2 다자간 회의 서비스를 위한 시나리오 = 16 3.3 기반기술의 문제점과 해결방안 = 18 3.4 제안 모델의 기본 구조 = 21 3.4.1 다자간 회의 시스템을 위한 기본 구조 = 21 3.4.2 단순 음성회의 접속 = 22 3.4.3 음성회의 도중 데이터 서비스 = 23 3.5 음성 회의 시스템을 위한 동작 = 24 제4장 실험 = 28 4.1 실험환경 = 28 4.2 VoiceXML과 WML을 통한 메뉴 출력 = 29 4.3 음성 회의 서비？보？ 위한 동작 = 33 제5장 결론 = 34 참고문헌 = 3

Mobile cloud computing

As mobile network infrastructures continuously improve, they are becoming popular clients to consume any Web resources, especially Web Services (WS). However, there are problems in connecting mobile devices to existing WS. This thesis focuses on three of the following challenge: loss of connection, bandwidth/latency, and limited resources. This research implements and develops a cross-platform architecture for connecting mobile devices to the WS. The architecture includes a platform independent design of mobile service client and a middleware for enhancing the interaction between mobile clients and WS. The middleware also provides a personal service mashup platform for the mobile client. Finally, the middleware can be deployed on Cloud Platforms, like Google App Engine and Amazon EC2, to enhance the scalability and reliability. The experiments evaluate the optimization/adaptation, overhead of the middleware, middleware pushing via email, and performance of Cloud Platforms

A distributed Quadtree Dictionary approach to multi-resolution visualization of scattered neutron data

Grid computing is described as dependable, seamless, pervasive access to resources and services, whereas mobile computing allows the movement of people from place to place while staying connected to resources at each location. Mobile grid computing is a new computing paradigm, which joins these two technologies by enabling access to the collection of resources within a user\u27s virtual organization while still maintaining the freedom of mobile computing through a service paradigm. A major problem in virtual organization is needs mismatch, in which one resources requests a service from another resources it is unable to fulfill, since virtual organizations are necessarily heterogeneous collections of resources. In this dissertation we propose a solution to the needs mismatch problem in the case of high energy physics data. Specifically, we propose a Quadtree Dictionary (QTD) algorithm to provide lossless, multi-resolution compression of datasets and enable their visualization on devices of all capabilities. As a prototype application, we extend the Integrated Spectral Analysis Workbench (ISAW) developed at the Intense Pulsed Neutron Source Division of the Argonne National Laboratory into a mobile Grid application, Mobile ISAW. In this dissertation we compare our QTD algorithm with several existing compression techniques on ISAW\u27s Single-Crystal Diffractometer (SCD) datasets. We then extend our QTD algorithm to a distributed setting and examine its effectiveness on the next generation of SCD datasets. In both a serial and distributed setting, our QTD algorithm performs no worse than existing techniques such as the square wavelet transform in terms of energy conservation, while providing the worst-case savings of 8:1

A Scalable, Distributed Middleware Service Architecture to Support Mobile Internet Applications

Middleware layers placed between user clients and application servers have been used to perform a variety of functions. In previous work we have used middleware to perform a new capability, application session handoff, using a single Middleware Server to provide all functionality. However, to improve the scalability of our architecture, we have designed an efficient distributed Middleware Service layer that properly maintains application session handoff semantics while being able to service a large number of clients. We show that this service layer improves the scalability of general clientto -application server interaction as well as the specific case of application session handoff. We detail protocols involved in performing handoff and analyse an implementation of the architecture that supports the use of a real medical teaching tool. From experimental results it can be seen that our Middleware Service effectively provides scalability as a response to increased workload. 1

A Scalable, Distributed Middleware Service Architecture to Support Mobile Internet Applications

Middleware layers placed between user clients and application servers have been used to perform a variety of functions to support the vision of nomadic computing across varying platforms. In previous work we have used middleware to perform a new capability, application session handoff, using a single Middleware Server to provide all functionality. However, to improve the scalability of our architecture, we have designed an efficient distributed Middleware Service layer that properly maintains application session handoff semantics while being able to service a large number of clients. We show that this service layer improves the scalability of general client-to-application server interaction as well as the specific case of application session handoff. We detail protocols involved in performing handoff and analyse an implementation of the architecture that supports the use of a real medical teaching tool. From experimental results it can be seen that our Middleware Service effectively provides scalability as a response to increased workload