Design and path planning for a remote-brained service robot

This paper presents a novel robot named "TUT03-A" with expert systems, speech interaction, vision systems etc. based on remote-brained approach. The robot is designed to have the brain and body separated. There is a cerebellum in the body. The brain with the expert systems is in charge of decision and the cerebellum control motion of the body. The brain-body. interface has many kinds of structure. It enables a brain to control one or more cerebellums. The brain controls all modules in the system and coordinates their work. The framework of the robot allows us to carry out different kinds of robotics research in an environment that can be shared and inherited over generations. Then we discuss the path planning method for the robot based on ant colony algorithm. The mathematical model is established and the algorithm is achieved with the Starlogo simulating environment. The simulation result shows that it has strong robustness and eligible pathfinding efficiency.

Design and path planning for a remote-brained service robot

This article introduced an effective design method of robot called remote-brain, which is made the brain and body separated. It leaves the brain in the mother environment, by which we mean the environment in which the brain's software is developed, and talks with its body by wireless links. It also presents a real robot TUT06-B based on this method which has human-machine interaction, vision systems, manipulator etc. Then it discussed the path planning method for the robot based on ant colony algorithm in details, especially the Ant-cycle model. And it also analyzed the parameter of the algorithm which can affect the convergence. Finally, it gives the program flow chat of this algorithm.

Web Services Workflows—Composition, Co-Ordination, and Transactions in Service-Oriented Computing

Web services can be seen as a newly emerging research area for Service-oriented Computing and their implementation in Service-oriented Architectures. Web services are self-contained, self-describing modular applications or components providing services. Web services may be dynamically aggregated, composed, and enacted as Web services Workflows. This requires frameworks and interaction protocols for their co-ordination and transaction support. In a Service-oriented Computing setting, transactions are more complex, involve multiple parties (roles), span many organizations, and may be long-running, consisting of a highly decentralized service partner and performed by autonomous entities. A Service-oriented Transaction Model has to provide comprehensive support for long-running propositions including negotiations, conversations, commitments, contracts, tracking, payments, and exception handling. Current transaction models and mechanisms including their protocols and primitives do not sufficiently cater for quality-aware and long running transactions comprising loosely-coupled (federated) service partners and resources. Web services transactions require co-ordination behavior provided by a traditional transaction mechanism to control the operations and outcome of an application. Furthermore, Web services transactions require the capability to handle the co-ordination of processing outcomes or results from multiple services in a more flexible manner. This requires more relaxed forms of transactions—those that do not strictly have to abide by the ACID properties—such as loosely-coupled collaboration and workflows. Furthermore, there is a need to group Web services into applications that require some form of correlation, but do not necessarily require transactional behavior. The purpose of this paper is to provide a state-of-the-art review and overview of some proposed standards surrounding Web services composition, co-ordination, and transaction. In particular the Business Process Execution Language for Web services (BPEL4WS), its co-ordination, and transaction frameworks (WS-Co-ordination and WS-Transaction) are discussed.

基于分布式协调模型的服务协作方法研究

由于服务是由彼此独立的提供商开发的,无法在开发阶段就预测到其潜在的所有交互可能,因此需要在实际协作时检查服务之间的兼容性,从而保障协作的正确性和一致性.提出了一种基于分布式协调模型的方法,以提高服务的可复用性和服务协作的灵活性.该方法通过失败等价(failure-equivalent)行为语义保持的投影规则,将协作流程转换为协作子流程,以实现分布式的成对兼容性检查,并提出基于适配的检查方法,检验服务是否可以通过适配机制满足兼容性的要求,同时给出了适配器自动生成的算法.适配机制的引入进一步降低了服务与协作环境的耦合关系,从而在保持服务组件自治特性的同时提高了服务协作的灵活性.

基于适配的服务协作流程动态管理

服务协作以服务为构造单元，通过组合不同的服务，实现复杂的业务逻辑，并以此为基础构建新的应用．为实现正确的服务协作，服务之间的交互必须是兼容且一致的．适配技术通过构造适配器来弥补服务之间的交互差异，为解决协作的一致性问题提供了有效的方法途径．然而考虑到服务计算环境的动态特性，协作适配器本身应具有动态调整及重新配置的能力，从而避免使其成为协作系统响应动态变化的可适应能力的瓶颈．文中首先给出了一种基于适配的服务协作方法，以保证服务交互的一致性．并针对提出的适配器结构，建立了适配器的执行模型，在此基础上给出了适配器的动态更新方法，使适配器具有可重配置以及动态调整的能力，从而保证了基于适配的服务协作系统的灵活性和动态可适应性．

基于BPEL的Web Service组合的数据流分析测试方法

随着Web Service组合变得越来越复杂,通过测试来保证服务质量和可靠性也变得越来越重要.将传统数据流分析方法扩展用于Web Service组合测试,提出了一种基于BPEL的Web Service组合的数据流分析测试方法.该方法基于一个测试模型:Web Service组合测试模型WSCTM,该测试模型可以捕获Web Service组合的数据流接口.采用基于服务的模型WSCTM,数据流可以从3个视点来分析:服务间、服务内和服务实现构件间.从而,Web Service组合的数据流测试可以在三层上得到实现.基于以上方法,可得到Web Service组合的定义-使用链,最终可产生满足既定测试标准以获得需求Web服务组合质量要求的测试路径.