Device Middleware for Mobile Applications

The paper discusses implemention of high-performance computing at Contra Costa College, a community college near Berkeley. We established a two-year vocational-training program for future Linux cluster administrators. Unfortunately, CCC has temporarily suspended its HPC degree program owing to a lack of students. The dot-com bust caused a downturn in all high-tech fields, particularly in Northern California. Further complicating matters is the lack of a consistent job title for cluster administrators, which makes it hard to point people to available jobs. Consequently, students don't know how bright a future the HPC job field has, and only a few students seek HPC training.     

Mobile Web Middleware of NFC Context-Awareness Applications

With the development of wireless networks and mobile computing, more advanced applications with context-awareness and adaptability to their changing context are needed. However, building context-aware applications is difficult due to the lack of adequate infrastructure support. In this paper, a web middleware architecture for the development of context-awareness applications using near field communication （NFC） is proposed. Based on it, the efficient support for acquiring, interpreting, and accessing context is provided, and the user＇s quality of experience is improved. Moreover, a mobile web middleware for the testing and full realization of NFC context-awareness applications has been developed together with two application examples.     

MoCA: A Middleware for Developing Collaborative Applications for Mobile Users

The Mobile Collaboration Architecture is a middleware architecture for developing and deploying context-aware collaborative applications for mobile users. MoCA comprises client and server APIs, a set of core services for registering applications, the ability to monitor and infer the execution context of mobile devices, and an object-oriented framework for instantiating and customizing server proxies according to applications’ specific adaptation and context-processing requirements. MoCA facilitates the development of distributed programs that require access to individual and group context to define application-specific and dynamic adaptations. MoCA’s design focuses on simplicity, extensibility, scalability, protocol heterogeneity, and application customization.     

支持移动多媒体服务中间件的体系结构

各种无线网与Internet,PSDN的集成,使移动的多媒体应用越来越受人们欢迎。由此阐述了支持基于下一代移动多媒体服务中间件的体系结构及可能提供的服务。     

面向云服务的移动中间件研究

传统移动应用的开发都是针对特定的需求而定制开发的,复用性低.本文结合云计算模式、SOA和中间件相关技术,给出一个可复用的面向云服务结构的移动应用中间件,该模型以SOA为基础,充分利用SOA自身的优势,通过中间件来间接访问云资源,屏蔽了多终端异构平台间的差异,解决终端应用瓶颈,支持离线处理、安全通信,与异构移动设备可靠通信,提高服务性能和效率.最后,通过实验证明了该模型的稳定性.     

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.     

XMIDDLE: A Data-Sharing Middleware for Mobile Computing

An increasing number of distributed applications will be written for mobilehosts, such as laptop computers, third generation mobile phones, personaldigital assistants, watches and the like. Application engineers have to dealwith a new set of problems caused by mobility, such as low bandwidth, contextchanges or loss of connectivity. During disconnection, users will typicallyupdate local replicas of shared data independently from each other. Theresulting inconsistent replicas need to be reconciled upon re-connection. Tosupport building mobile applications that use both replication andreconciliation over ad-hoc networks, we have designed xmiddle, a mobilecomputing middleware. In this paper we describe xmiddle and show how it usesreflection capabilities to allow application engineers to influencereplication and reconciliation techniques. xmiddle enables the transparentsharing of XML documents across heterogeneous mobile hosts, allowing on-lineand off-line access to data. We describe xmiddle using a collaborativee-shopping case study on mobile clients.     

交互电视中间件的发展及应用

介绍了交互电视中间件的标准分类、主要的中间件厂商及其产品、中间件模拟器及中间件提供的交互应用,给出了基于XletView模拟器开发交互应用的设计和实现过程.     

Syxaw: Data Synchronization Middleware for the Mobile Web

In this paper, we present a middleware for synchronization of opaque and structured data in a mobile and resource-constrained environment. The presented Syxaw (Synchronizer with XML-awareness) system distinguishes itself from related proposals in that it interoperates transparently with resources on the World Wide Web, and by exhibiting a model of synchronization that is both easy to understand and well suited for weak devices in a mobile and ubiquitous environment. We demonstrate the feasibility of the proposed system by considering several usage scenarios, including working on the Web and collaborative XML editing. We consider system performance on a mobile wireless device, and examine the impact of different optimization techniques to the performance. According to our analysis, Web interoperability suggests that the data share model be kept simple and conservative, and that moving functionality onto the client is advantageous. We find that the techniques of operation bundling and concurrent use of network downlink and uplink improve network utilization, but that achieving full bandwidth usage with a weak client is challenging in practice.     

支持移动多媒体的安全中间件

安全以其复杂性和高计算性成为移动通信和移动Internet、特别是移动电子商务发展的瓶颈。根据中间件屏蔽复杂性的特性,设计了一种支持移动多媒体通信的安全中间件模型。该模型主要实现2大安全性服务:基于3GPP标准建议实现移动终端和移动网络的安全通信,在此基础上基于WAP2.0标准实现移动终端与Internet等第3方服务提供商之间的安全通信。主要描述和分析了这个安全中间件模型,并在此基础上提出了一种实现移动终端到移动终端的端到端通信安全的方法。     

中间件及其在移动服务网中的应用

主要介绍中间件的种类、分布式体系结构、技术特点、工作机理及其应用。描述了中间件在优化移动服务网体系结构等方面的作用，重点阐述了移动服务网中几个子系统，如何采用中间件合理实现三层体系架构，探讨了采用中间件技术实现移动服务网扩展性的方式。     

An Efficient Dynamic Integration Middleware for Cyber-Physical Systems in Mobile Environments

Advances in information technologies have brought a wide variety of computing environments. In recent years, integrations of computational, networking, and physical elements in different environments tend to increase, so interoperability between heterogeneous computing elements has become a key area of research. A cyber-physical system (CPS) that has gained a lot of attention lately is a tight integration of the system’s computational and physical elements. The CPS technology builds on the older discipline of embedded systems, and CPS applications can be found in diverse industry sectors, such as smart home, health care, and transportation. There is a high possibility that a global CPS network that integrates different CPS networks appears in the near future. This paper proposes a CPS middleware framework that ensures interoperability and communication between heterogeneous components in a global CPS network. Through local and global communications, the proposed middleware makes mobile devices in different networks interoperable. It employs Internet Protocol version 6 (IPv6) and performs protocol conversion to communicate with devices using different protocols.     

支持移动多媒体通信中间件的WAP网关

WAP协议是WAP论坛提出的一个开放通信协议;WAP网关进行协议的转换,是移动终端无线接入Internet的枢纽。在简要介绍了无线应用协议后,提出了一个在Linux操作系统平台下运行的WAP网关(数据通信网关)的设计与实现方案,该WAP网关由承载层模块、WAP模块和SMS模块组成,其中详细介绍承载层模块和WAP模块的工作原理,并在实验室环境下对网关进行测试,给出了测试结果。     

面向分布仿真应用的高可扩展负载平衡中间件

基于CORBA技术,通过采用基于POA的负载平衡粒度,提出了一种高可扩展的负载平衡中间件模型.并阐述了该模型相关的若干关键技术、解决方法及其实现,包括负载策略的扩展、负载度量的扩展等.     

实用的移动应用接收器

目前市场上大部分接收器在设计上都受到印制电路板的板面空间、材料和成本的限制,移动手机的限制更多.零差接收器虽然外型更为小巧,设计更为简单,但仍有几个实施上的问题必须解决,因此对于系统设计工程师来说,设计零差接收器可说是一大挑战.本文将以美国国家半导体的GSM芯片组作为例子详细分析超外差接收器,以及采用较低中频接收器的蓝牙射频系统.     

Multi-Fidelity Algorithms for Interactive Mobile Applications

We introduce the concept of multi-fidelity algorithms, which revises the classical notion of an algorithm. Instead of having a fixed output criterion and allowing the resource consumption to vary, we bound the resource consumption and allow the fidelity or output criterion to vary. We discuss how multi-fidelity algorithms can improve the latency and battery life of interactive mobile applications. An extension of this idea allows the system to automatically discover sweet spots: sharp discontinuities in the fidelity-resource tradeoff space.     

An Energy Efficient Middleware Architecture for Processing Spatial Alarms on Mobile Clients

Time based alarms are used by many on a daily basis. Spatial alarms extend the very same idea to location based triggers, which are fired whenever a mobile user enters the spatial region of the location alarms. Spatial alarms provide critical capabilities for many mobile location based applications ranging from personal assistants, inventory tracking to industrial safety warning systems. In this paper we present a middleware architecture for energy efficient processing of spatial alarms on mobile clients, while maintaining low computation and storage costs. Our approach to spatial alarms provides two systematic methods for minimizing energy consumption on mobile clients. First, we introduce the concept of safe distance to reduce the number of unnecessary mobile client wakeups for spatial alarm evaluation, enabling mobile clients to sleep for longer intervals of time in the presence of active spatial alarms. We show that our safe distance techniques can significantly minimize the energy consumption on mobile clients compared to periodic wakeups while preserving the accuracy and timeliness of spatial alarms. Second, we develop a suite of techniques for minimizing the number of location triggers to be checked for spatial alarm evaluation upon each wakeup. This further reduces the computation cost and energy expenditure on mobile clients. We evaluate the scalability and energy-efficiency of our approach using a road network simulator. Our spatial alarms middleware architecture offers significant improvements on battery lifetime of mobile clients, while maintaining high quality of spatial alarm services, especially compared to the conventional approach of periodic wakeup and checking all alarms upon wakeup.