Zhilin Yao

An ontology based workflow centric collaboration system

This article introduces a workflow centric collaboration system based on ontology, which is context-aware and adaptive. Using ontology to represent most collaboration elements and rules of the system, we introduce an ontology repository into the framework. It gives the system the capability to represent collaboration knowledge smoothly. The system focuses on business workflow transition and business data manipulation. It can be easily extended and upgraded by modifying the ontology repository when the requirements change. Based on ontology, the system can also interact with other ontology based systems and applications.

Long Term Web Service Oriented Transaction Handling Improvement of BTP Protocol

Web services transaction handing is a key technique issue of computer supported corporate work. BTP protocol is a neutral protocol. It is not a specific web service transaction coordinating protocol. In order to enable BTP to support long term transaction, we made some modifications on it. These modifications include three aspects, which are, (1) To provide a strategy to eliminate negative effects caused by temporary results; (2) To put forward piecewise strategy of transaction node; (3) To put forward autonomy strategy of un-confirm collection elements. We also give design and implementation of transaction handling system, which is part of project “Model Driven Service Oriented Application Development and Integration Platform”, in which we use service broker method to extend a web service’s function, and enable services with transaction handling ability without making any modification on it.

Adaptive collaboration in an ever-changing environment

Traditional collaboration systems are typically bundled with a set of tools with pre-specified static workflow and usage patterns. They are found to be inflexible and incompetent for todays heterogeneous and ever-changing collaboration contexts and computing environments. Todays collaboration systems must be aware of the dynamic changes of collaboration contexts in a timely manner and be adaptive to these changes appropriately. In this paper, we illustrate how business logic and computing environment context awareness are provided through a set of shared ontologies with well-defined semantics in a project called as EkSarva. The awareness of collaboration contexts and its changes then enables the collaboration system to adapt to these changes and be more flexible. A dynamic workflow process is also facilitated by the context-awareness.

A Workflow System Based on Ontology

This article proposes a collaborative workflow system based on ontology, which is focused on typical database access. By introducing ontology base and realizing the ontology definition of flow service, domain knowledge and user interface, the system is able to incorporate collaborative knowledge dynamically and thus is flexible enough to apply in other domains which have same application patterns. The extension and upgrade of the system can be achieved by updating and adding the definition of ontology, which is one of the distinct features of the system. With the ontology base, it is possible to enable the cooperation among different systems, the interaction among different workflow systems, as well as the interaction between workflow system and other applications

Application and Research of Ontology in Workflow Knowledge Meta-model

Workflow management is the key technology in implementing the control of business process. The current workflow meta-model depends on specific parameters and implementation process, and lacks the exhibition of semantics understanding and knowledge involved. So, this paper proposes a workflow knowledge meta-model based on ontology, in order to support the combination of business modeling process and knowledge in the process. With the definition of exact grains meta knowledge object in workflow ontology, it can implement the separation of basic applications objects and meta objects and customization of workflow process. Moreover, the paper proposes related definition, which will be of great help for the transition from process meta-model to workflow knowledge meta-model.

An expert system for preventing and auditing intrusion

Network security research is an important aspect of CSCW (computer supported cooperative work). It helps to make work environment essential and reliable. Access control security technology mainly includes firewall technology, intrusion detection technology, and security auditing technology. These technologies still have some problems and shortages though they are matured in some degree. The expert system for preventing and auditing intrusion is a series of software and hardware systems for reducing the risk of computer network security. It is an effective closed loop control system that integrates with firewall, intrusion detection, and auditing trail analysis. It uses the learning ability of expert system to add knowledge and rules. Also it combines the characteristics of real-time and unreal-time to form an access control security system and enhance the security of the network.