一种用于基于知识系统开发的形式化模型

ＬＫＯ是一个新面向对象和逻辑范型相结合用于基行知识的系统的形式化开发模型，其中逻辑对象是集状态，约束，行为，继承于一体的抽象实体，它支持框架，规则，语义网络，黑板等多种知识表示，因而可用来形式地描述基于知识系统的需求规范。在知识获了过程中通过对形式规范反复地修改，验证及确认而形成软件原型。／     

面向Agent软件工程（Ⅱ）：规范,实现与验证

AOP[1,2〕的主要思想是在计算中采用“人格化”这一抽象工具,来解释、理解并编制计算机系统.AOP的优点在于:l)便于agent描述:能用熟悉、非技术性的语言来定义agent;2)嵌套式表示:能够方便地表示包含其它系统描述的系统;3)AOP是一种超描述性编程风范。在AOP中,我们只需给出一个非常抽象的系统规范,系统在确保其行为与内置的a罗nt理论(如,著名的Cohen一Leve,que意念模型)一致的情况下,由系统的控制机制确定应当怎么做。既然AOP具有很好的发展前景[s1,为使AOP走向实用化,我们必须处理一些软件工程上的问题[’J,即,如何规范、实现和验证面向agent的系统口一般采用非经典逻辑来描述智能agent和多a-gent系统.但是,如何从用逻辑语言描述的规范合理地导出能满足这些规范的实现,是困扰agent理论研究和实际系统实现两大阵营的重要问题,也许主要症结在于:这些逻辑系统通常用抽象、非基本的可能世界语义来刻画agent的信念等心智状态。可能世界语义虽然具有优美的数学性质和对应理论,但可能世界与agent的内部状态之间究竟有什么关系,至今仍不大明朗,因而导致了逻辑系统与实际建立的agent系统之间的关系也模糊不清,而AOP范型的实用化必须首先解决这个问题。 Wooldridge形式定义了一种基于分支时间的表示逻辑Lts],     

对象式逻辑程序设计语言LKO的说明性语义

本文基于逻辑程序设计语言的良基模型语义，探讨了对象逻辑程序设计语言ＬＫＯ的说明性语义，该语义由组合迭代的极小不动点定义，具有构造性和组合性，迷在ＬＫＯ中进一步引入非单调继承和逻辑奠定了基础。     

Aspect-Oriented Modeling and Verification with Finite State Machines

Aspect-oriented programming modularizes crosscutting concerns into aspects with the advice invoked at the specified points of program execution. Aspects can be used in a harmful way that invalidates desired properties and even destroys the conceptual integrity of programs. To assure the quality of an aspect-oriented system, rigorous analysis and design of aspects are highly desirable. In this paper, we present an approach to aspect-oriented modeling and verification with finite state machines. Our approach provides explicit notations (e.g., pointcut, advice and aspect) for capturing crosscutting concerns and incremental modification requirements with respect to class state models. For verification purposes, we compose the aspect models and class models in an aspect-oriented model through a weaving mechanism. Then we transform the woven models and the class models not affected by the aspects into FSP (Finite State Processes), which are to be checked by the LTSA (Labeled Transition System Analyzer) model checker against the desired system properties. We have applied our approach to the modeling and verification of three aspect-oriented systems. To further evaluate the effectiveness of verification, we created a large number of flawed aspect models and verified them against the system requirements. The results show that the verification has revealed all flawed models. This indicates that our approach is effective in quality assurance of aspect-oriented state models. As such, our approach can be used for model-checking state-based specification of aspect-oriented design and can uncover some system design problems before the system is implemented.     

一个基于信息网络的软件Agent系统的设计

本文介绍了一个基于信息网络的软件Agent系统（SAFIN）的设计。SAFIN系统以Internet/Intranet为背景,将面向Agent程序设计、Agent通信语言KQML和移动Agent的某些技术集成起来,旨在建立一个实用的Agent框架,方便信息网络中软件Agent系统的构造。