A metasystem is composed geographically distributed heterogeneous resources that can be reached over the network. An essential software layer, often called middleware, maps heterogeneous hosts into a single coherent v...
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A metasystem is composed geographically distributed heterogeneous resources that can be reached over the network. An essential software layer, often called middleware, maps heterogeneous hosts into a single coherent virtual machine, giving the user the power of a unique computing environment. In this paper, an object-oriented middleware for the metasystem based on Internet is described in detail. It masks the hardware details, giving the user a single-image space system with transparent data transfer and uniform program interface.
Aiming at improving the reconfiguration capability of an automatic testing system for turbine machinery, the method of object-orientation (OO) is employed to develop its software. Since the project size is small, we a...
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Aiming at improving the reconfiguration capability of an automatic testing system for turbine machinery, the method of object-orientation (OO) is employed to develop its software. Since the project size is small, we adopt a compact and pragmatic approach to construct this object-oriented application instead of using complicated commercial object-oriented methods. Although the method is simple, it covers all phases from collecting customer requirements to testing the code. In this paper, the five main phases of the object-oriented method including requirements capture, analysis, design, programming and testing are presented. The successful practical application proves that the adopted object-oriented method is efficient in software development.
There are many applications that have complex structures, complex relationships and dynamic changes. There is a trend to publish information and do work in the Internet. The traditional objectoriented method cannot f...
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There are many applications that have complex structures, complex relationships and dynamic changes. There is a trend to publish information and do work in the Internet. The traditional objectoriented method cannot fulfill the need of such systems. We define a new process method. First we use the semantic network to describe the requirement of the application. Then the role theory and the authorization tree are used to design the database of the system. This method is very distinct and easy to use in the development of the web-based applications.
CORBA is a new generation of the distributed computing platform based on the distributed object computing technology, and security is always a fundamental problem of a distributed computing platform. Thus, implementat...
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CORBA is a new generation of the distributed computing platform based on the distributed object computing technology, and security is always a fundamental problem of a distributed computing platform. Thus, implementation of security service in the CORBA platform is very important. Referring to the related security standards and distributed computing platform's security models, the CORBA security service in this paper is designed and implemented conforming to the CORBA Security Service Specification (v1.0). In addition, the necessity of supporting object invocation monitor in ORB is proposed based on our work on the CORBA security service.
In the network management areas, management information models are based on a center of managed objects to denote the abstract of network resource. Internet management standards only tell how to access management vari...
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In the network management areas, management information models are based on a center of managed objects to denote the abstract of network resource. Internet management standards only tell how to access management variables. Aiming at making use of recent advances in distributed computing and in object-oriented analysis and design, Internet management architecture can also be based the Open Distributed Processing Reference Model (RM-ODP). The purpose of this article is to provide an Internet object-oriented Information Model. First, layered management information architecture will be discussed. Subsequent sections of this article will present the generic object-oriented information model. The information model is specified using object-Z.
Electronic commerce on the Internet receives much attention now. The workflow management is regarded as an effective mechanism for managing those business processes behind the electronic commerce. But today's work...
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Electronic commerce on the Internet receives much attention now. The workflow management is regarded as an effective mechanism for managing those business processes behind the electronic commerce. But today's workflow management model has many drawbacks in this field. This paper gives a novel workflow management model based on mobile agents for Internet electronic commerce. And its advantages are also presented.
The development of multi_agent systems (MAS) for application to manufacture control was discussed. The special feature of the agents and its interactions was determined after the analysis of manufacture control system...
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The development of multi_agent systems (MAS) for application to manufacture control was discussed. The special feature of the agents and its interactions was determined after the analysis of manufacture control system. Each agent was described as an cooperative active object (CAO) consisting of data structures and behavior control structure. The execution roles of a task order and management roles of processing devices were recognized with respect to multi agent idea. The MAS was implemented completely on Internet to promote manufacture control applications.
With the development of computer technology, the computer application under distributed environment has become a trend of development. However, the even higher requirement of the data consistency and integrality under...
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With the development of computer technology, the computer application under distributed environment has become a trend of development. However, the even higher requirement of the data consistency and integrality under the distributed environment makes the traditional transaction process technology incompetent. To meet the new challenge, the object Transaction Service model for distributed application environment was proposed, it combines both the traditional transaction process technology and the distributed objecttechnology. The object Transaction Management System (OTMS) we implemented was based on the OTS Model, which provides full capability of transaction service and management. Both the theory and the concrete implement technology of object Transaction Management System are presented in this paper.
Ownership trees are a simple yet powerful method of extracting an object-oriented program's implicit aggregation structure front its object graph. The topology of a program's ownership tree is independent of s...
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Ownership trees are a simple yet powerful method of extracting an object-oriented program's implicit aggregation structure front its object graph. The topology of a program's ownership tree is independent of scale - objectoriented programs are constructed from objects, and the relationship between a whole system and its top-level components is the same as the relationship between a low-level data structure and the objects that implement it. Because of this independence, a software visualization tool based on ownership trees is applicable at all levels of abstraction within a program's design. Visualizing ownership trees can support learning, teaching, debugging, and maintaining object-oriented programs.
Many data objects in the real world have attributes about location and time. Such spatiotemporal objects can be found in applications such as Geographic Information systems (GIS), environmental data management and mul...
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Many data objects in the real world have attributes about location and time. Such spatiotemporal objects can be found in applications such as Geographic Information systems (GIS), environmental data management and multimedia databases. Traditional relational database technology is not suitable for managing spatiotemporal data, which are multi-dimensional with complex structures and behaviours. Spatiotemporal data can only be managed by new generation of data management technologies such as object-oriented and object-relational databases. In this paper, we present a comprehensive survey covering aspects from fundamental user requirements for spatiotemporal applications, spatiotemporal object modelling, object storage structures and techniques for manipulation of spatiotemporal objects such as multidimensional indexing, data structures, query evaluation strategies and architectures for Spatiotemporal Database Management systems.
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