Design and analysis techniques for concurrent blackboard systems

Blackboard systems are a natural progression of Artificial Intelligence based systems into a more powerful problem solving technique. They provide a way for several highly specialized knowledge sources to cooperate to solve large, complex problems. Blackboard systems incorporate the concepts developed by rule-based and expert systems programmers and include the ability to add conventionally coded knowledge sources. The small and specialized knowledge sources are easier to develop and test, and are hosted on hardware specifically suited to the task that they are solving.;Designing and developing blackboard systems is a difficult process. The designer is attempting to balance several conflicting goals and achieve a high degree of concurrent knowledge source execution while maintaining both knowledge and semantic consistency on the blackboard. Blackboard systems have not attained their apparent potential because no established tools or methods exist to guide in their construction or analyze their performance.;The Formal Model for Blackboard Systems was developed to provide a formal method for describing a blackboard system. The formal model outlines the basic components of a blackboard system, and how the components interact. A set of blackboard system design tools has been developed and validated for implementing systems that are expressed using the formal model. The tools are used to test and refine a proposed blackboard system design before the design is implemented. The set of blackboard system design tools consists of a Knowledge Source Organizer, a Knowledge Source Input/Output Connectivity Analyzer, and a validated Blackboard System Simulation Model. My preliminary research has shown that the level of independence and specialization of the knowledge sources directly affects the performance of blackboard systems. Using the design, simulation, and analysis tools I developed a concurrent object-oriented blackboard system that is faster, more efficient, and more powerful than existing systems. The use of the design and analysis tools provided the highly specialized and highly independent knowledge sources required for my concurrent blackboard system to achieve its design goals

World wide web implementation of the Langley technical report server

On January 14, 1993, NASA Langley Research Center (LaRC) made approximately 130 formal, 'unclassified, unlimited' technical reports available via the anonymous FTP Langley Technical Report Server (LTRS). LaRC was the first organization to provide a significant number of aerospace technical reports for open electronic dissemination. LTRS has been successful in its first 18 months of operation, with over 11,000 reports distributed and has helped lay the foundation for electronic document distribution for NASA. The availability of World Wide Web (WWW) technology has revolutionized the Internet-based information community. This paper describes the transition of LTRS from a centralized FTP site to a distributed data model using the WWW, and suggests how the general model for LTRS can be applied to other similar systems

World Wide Web Implementation of the Langley Technical Report Server

On January 14, 1993, NASA Langley Research Center (LaRC) made approximately 130 formal, \u27unclassified, unlimited\u27 technical reports available via the anonymous FTP Langley Technical Report Server (LTRS). LaRC was the first organization to provide a significant number of aerospace technical reports for open electronic dissemination. LTRS has been successful in its first 18 months of operation, with over 11,000 reports distributed and has helped lay the foundation for electronic document distribution for NASA. The availability of World Wide Web (WWW) technology has revolutionized the Internet-based information community. This paper describes the transition of LTRS from a centralized FTP site to a distributed data model using the WWW, and suggests how the general model for LTRS can be applied to other similar systems

Blackboard Model on Parallel Distributed Environments

摘要:黑板模型支持并行性 ,它是分布式和并行编程可用的强有力的模型之一。在一个需要并行性和分布式编程的系统中,黑板模型有助于组织和概念化并发性及通信。本文着重分析了黑板模型的结构、构造方法、控制策略。基于CORBA(Common Object Request Broker Architecture)对象和全局对象研究了黑板和知识库的实现。最后,通过一个具体实例的实现方法和过程 ,说明了黑板模型解决分布式和并行编程问题的可行性。 Abstract : The blackboard model supports parallelism. It is one of the most powerful model for distributed and parallel programming.In parallel and distributed programming system , the blackboard model is helpful to organizing and concept ualization concurrency and communicating. This paper researches the structure of the blackboard model, construction method, control strategies. Based on CORBA (Common Object Request Broker Architecture) objects and global objects,the implementing of blackboard and knowledge source are studied. At last,by using implementation method and process of a typical example,this paper illust rates the feasibility that blackboard models are used to solve dist ributed and parallel programming.福建省自然科学基金项目(A0310008) ; 福建省高新技术研究开放计划重点项目(2003H043