DaaS: Cloud-based mobile Web service discovery

The proliferation of smartphones and the recent advancement in ubiquitous wireless access have made mobile Web services more possible than ever before. However, finding relevant Web services that can match requests and fit user context remains a major concern. The challenges facing Web service discovery are further magnified by the stringent constraints of mobile devices and the inherit complexity of wireless heterogeneous networks. Cloud computing, with its flexible design and theoretically unlimited computing resources, is a viable approach to bootstrapping Web service discovery. The cloud can build bridges between mobile devices, as a convenient ubiquitous interface, and a backbone infrastructure with abundant computing resources. This paper introduces “Discovery as a service (Daas)”, a novel cloud-based discovery framework that addresses the core components of mobile Web service discovery. The DaaS framework lays the foundation of efficient mobile Web service discovery that takes into consideration user preferences and context. The experimental validation and performance evaluation demonstrate that DaaS can effectively rank relevant services according to the various user context and preferences, in addition to enhancing the precision of the discovered services. The prototype also shows that Web service clustering for discovery significantly improves the overall response time, while the cloud maintains scalability according to prespecified performance criteria.     

A lightweight Web service enabled framework for ubiquitous RFID applications

RFID can give a unique digital identifier to real physical object, and bridge the physical world with the virtual digital world. Based on the analysis on our experience of RFID applications, some common key issues and requirements of RFID application are presented. A lightweight framework based on Web Service to support ubiquitous RFID application is designed and implemented. This lightweight framework provides the integration of RFID technology and other holistic applications. Virtual object is used to map the real physical world object and the virtual digital object. The experiment result is given and some future research directions are discussed.     

移动Web位置服务的框架研究

结合实践研究,提出了一个移动Web位置服务的整体框架,并对已有相关技术成果进行分析对比。探讨了该领域未来的研究工作。     

Aondê: An ontology Web service for interoperability across biodiversity applications

Biodiversity research requires associating data about living beings and their habitats, constructing sophisticated models and correlating all kinds of information. Data handled are inherently heterogeneous, being provided by distinct (and distributed) research groups, which collect these data using different vocabularies, assumptions, methodologies and goals, and under varying spatio-temporal frames. Ontologies are being adopted as one of the means to alleviate these heterogeneity problems, thus helping cooperation among researchers. While ontology toolkits offer a wide range of operations, they are self-contained and cannot be accessed by external applications. Thus, the many proposals for adopting ontologies to enhance interoperability in application development are either based on the use of ontology servers or of ontology frameworks. The latter support many functions, but impose application recoding whenever ontologies change, whereas the first supports ontology evolution, but for a limited set of functions.This paper presents Aondê—a Web service geared towards the biodiversity domain that combines the advantages of frameworks and servers, supporting ontology sharing and management on the Web. By clearly separating storage concerns from semantic issues, the service provides independence between ontology evolution and the applications that need them. The service provides a wide range of basic operations to create, store, manage, analyze and integrate multiple ontologies. These operations can be repeatedly invoked by client applications to construct more complex manipulations. Aondê has been validated for real biodiversity case studies.     

基于移动Agent的Web服务组合执行框架设计

对Web服务组合技术深入分析,从Web服务组合的控制执行层面入手,结合移动Agent的优势,提出一种基于移动Agent的Web服务组合执行框架。对于复杂Web服务组合,框架可将其分解成若干相互依赖的任务片,其中任务片对应一个线性的子Web服务组合,然后分配给多个移动Agent进行分布式执行。     

Personal mobile services

Ubiquitous information access through mobile devices has become a typical practice in everyday life. The mobile service paradigm shifts the role of mobile devices from consumers to providers, opening up new opportunities for a multitude of collaborative services and applications ranging from sharing personal information to collaborative participatory sensing. Although many basic principles of the standard Web service approach continue to apply, the inherent constraints of mobile devices and broadband wireless access render the deployment of the standard architecture in mobile environments inefficient. This paper introduced personal services, a user-centric paradigm that enables service-oriented interactions among mobile devices that are controlled via user-specified authorization policies. Personal services exploit the user’s contact list (ranging from phonebook to social lists) in order to publish and discover Web services while placing users in full control of their own personal data and privacy. Experimental validation demonstrates the ability of personal services to foster a new generation of collaborative mobile services. Performance evaluation results show that the publication and discovery through contact lists are efficient and that service announcements and discovery requests can reach a huge number of users in a few seconds. Results also support a conclusion that resources-constrained devices can collaborate to carry out functionalities beyond the ability of their resources limitations.     

Customer-centered design for mobile applications

Designing applications for mobile platforms presents unique and harder challenges than traditional software design. Users of such devices expect to be able to run such applications with no training, no traditional packaging elements such as quick start cards, and no help system. Customer-centered design is probably the only way such applications can be designed successfully. This paper presents our experience using customer-centered design to create a sophisticated mobile application—mSports Baseball. We describe the application and detail how we modified contextual Design (CD), our customer-centered design process, to produce an application users could enjoy with no training and no help.

面向移动终端的屏幕自适应网页设计

分析了屏幕自适应网页设计的基本原理,系统阐述了综合运用媒体查询技术与流式布局设计屏幕自适应网页的方法,探讨了使用PC浏览器测试网页屏幕自适应性的简便方法。     

提高Web服务匹配效率的服务过滤方法

为提高Web服务匹配的时间效率,提出了Web服务与当前服务请求之间的泛化语义无关关系,并证明了满足该关系的服务与当前服务的不可匹配性;提出了判定服务与当前请求的语义泛化无关的高效判定规则,即两者的泛化语义的交是不可满足的;基于该判定规则,提出了支持Web服务匹配的服务过滤方法。应用和实验分析表明,该方法可提高服务匹配的时间效率。     

MultiOff: offloading support and service deployment for multiple IoT applications in mobile edge computing

The Journal of Supercomputing - Mobile Edge Computing (MEC) provides a new opportunity to reduce the latency of IoT applications significantly. It does so by offloading computation-intensive tasks...     

支持4G自适应多媒体应用的移动服务中间件开发

描述了4G环境下支持移动多媒体应用的中间件(4G中间件)的需求、基于开放标准OSGi技术的4G中间件体系结构;阐述了4G中间件提供的主要服务。     

Usage-centered engineering for Web applications

This article describes a flexible, model-driven approach for engineering Web applications that succeeds through a focus on user interface design and usability. Its simple, model-driven techniques work well for novel applications and integrate readily with lightweight or agile development processes under compressed development schedules