Workflow-Based Authorization Service in the Grid

In a distributed environment, a specific right may be required while a task is controlled and processed. A user should delegate enough rights to a task for processing. Tasks cannot work correctly if delegated rights are insufficient, or security threats may occur if delegated rights are excessive. Restricted delegation is the step that delegates proper rights to a task, and that enables fine-grained authorization in the Grid. In this paper, we propose the WAS architecture as a method for supporting restricted delegation and rights management. In contrast to traditional architecture, the WAS architecture uses a workflow that describes the sequence of rights required for normal execution of a task. By using the workflow, the WAS architecture is able to check whether the task exercises allowed rights. The WAS architecture is implemented on Globus toolkit 2.0 and extended on Globus toolkit 3.0.     

智能化通信网络综合管理系统浅析

首先对智能化网络管理技术相关的现状和趋势进行了分析;接着介绍结合了基于策略的网络管理技术、基于规则的告警关联分析技术、基于工作流的过程控制技术实现的智能化综合网络管理系统原型系统。     

Distributed manufacturing execution systems: A workflow perspective

Research of manufacturing execution systems (MESs) has been conducted to integrate ERP and physical operational systems, so a fully automated and integrated manufacturing management environment can be developed. However, as subcontracting becomes common in industries, a single MES is not enough and it is necessary to develop distributed MESs to integrate the distributed operations. This research proposes a distributed workflow model to develop such a system. In the workflow model, there are three cooperation types for defining the relationships between an action and resources. Six relational patterns are defined for the relationships between actions. This research also reviews current information technologies, including data acquisition and control (DAC) components, control software's, ASP .NET, and CLIPS, for supporting the development of distributed workflow models. Additionally, this research proposes using a collaborative workflow-based protocol (CWP) to form a distributed workflow. CWP is based on the integration of Internet technology and CLIPS. It is found that the proposed structure may ease the decision process of forming a distributed workflow. In summary, this article reports a cutting edge approach for the development of distributed manufacturing execution systems. The results show solutions for integrating high-level planning systems, such as ERP, and low-level operational systems through information technologies.     

一种工作流环境下能耗感知的多路径服务组合方法

当前,服务组合方法只考虑组合服务QoS的优化而不考虑组合服务的能耗优化.针对这一问题,文中首先根据不同情况提出了两种服务能耗模型;其次在基于工作流的服务组合环境下,提出了一种能耗感知的多路径服务组合方法 EAMSC.该方法对服务组合的能耗优化问题进行了数学建模,并提出了一种基于启发式的多路径服务组合算法,该算法包括两个部分:一是组合服务的可行路径查找,即在满足端到端QoS约束的前提下找出若干条可行的服务组合路径;二是请求速率的分配,即在可行的服务组合路径上依据服务能耗模型分配请求流量以降低组合服务的总体能耗.最后,仿真实验结果表明:能耗感知的多路径服务组合方法与传统的服务组合方法相比,能够在保证端到端QoS约束的基础上有效地减少组合服务的总能耗.