支持产业集群的资源共享环境结构与技术研究*

在分析产业集群资源信息共享需求的基础上,论述了支持产业集群开放资源服务的资源共享环境的概念和内容;提出一种由客户端、代理存储、安全维护、应用服务和公共数据中心组成的支持产业集群资源共享服务的五层体系结构;分析论述了同一产业集群内各成员企业资源信息通过Internet实现共享与交换的方法和关键技术,为建成可实施的服务与产业集群网络化制造的资源服务共享环境打下基础。     

网络数据分类研究进展

各种网络的广泛应用产生了大量的网络数据,对网络数据进行分类是数据挖掘的一个重要问题。文中对网络数据分类的国内外研究进展进行评述。首先概述网络数据分类的基本概念,然后详细分析各种网络数据分类算法,重点讨论在网络标注稀疏情况下的网络数据分类面临的挑战和解决策略,最后对网络数据分类技术进行总结和展望。     

未来网络科学与工程若干问题综述

从网络计算理论、网络科学和网络设计、网络设计与工程、网络设计与社会价值等方面阐述了构建未来网络面临的若干问题,其中任何一个问题的解决都将极大地推动计算机网络的发展。     

基于服务器计算技术及其在ASP平台中的应用*

软件资源共享是“软件变服务”的主要手段,是网络化制造ASP平台的主要支撑技术。基于服务器计算是软件资源共享的基本思路。研究了各类基于服务器计算技术的特点、原理等。对X终端、Windows终端、MetaFrame、GoGlobal、Tarantella和VNC等进行了较深入的探讨。介绍了基于服务器计算技术在网络化制造ASP服务平台中的应用。     

Layered learning design: Towards an integration of learning design and learning object perspectives

The use of ICT to enhance teaching and learning depends on effective design, which operates at many levels of granularity from the small to the very large. This reflects the range of educational problems from course design down to the design of activities focused on specific learning objectives. For maximum impact these layers of design need to be co-ordinated effectively. This paper delineates a reference model of ‘layered learning design’ where designs at one layer should use and incorporate designs from lower (more specific) layers in elegant and powerful ways. This would allow different designers, or tutors, to focus on different levels of abstraction in the learning design process, and to collaborate in combining designs to make a substantial impact on practice.     

Rationality of reward sharing in multi-agent reinforcement learning

In multi-agent reinforcement learning systems, it is important to share a reward among all agents. We focus on theRationality Theorem of Profit Sharing ⁵⁾ and analyze how to share a reward among all profit sharing agents. When an agent gets adirect reward R (R>0), anindirect reward μR (μ≥0) is given to the other agents. We have derived the necessary and sufficient condition to preserve the rationality as follows;

Networked control design for linear systems

In this paper we study a systematic networked control method designed specifically to handle the constraints of the networked realization of a linear time invariant control system. The general structure of the proposed controller requires switching between the open loop and closed loop subsystems of the controller which is dictated by the behaviour of the communication network.     

学习对象元数据在远程教育有效利用研究

随着远程教育的不断发展,如何进行信息资源共享已经成远程教育发展中迫切需要解决的重要任务.在对远程教育中学习对象元数据应用和关键技术分析的基础上,研究在远程教育信息资源共享中如何有效利用学习对象元数据.     

On controller & capacity allocation co-design for networked control systems

This paper presents a framework for examining joint optimal channel-capacity allocation and controller design for networked control systems using store-and-forward networks in a discrete-time linear time-invariant setting. The resultant framework provides a synthesis procedure for designing distributed linear control laws for capacity-constrained networks taking the allocation of the capacity within the network into account.     

一种形式化的学习过程建模

目前对E-learning技术进行深入的研究对于丰富我国教育方式和提高总体教育水平有着重要的意义。学习过程的建模则是为实现学习管理系统,将E-learning的相关理念运用于实际,打下坚实的理论基础。本文首先介绍了学习设计理念以及Petri网的概念。其次,依次描述了学习活动和活动构件、技能、学习过程的建模过程,并在在此基础上补充了活动结构的概念。最后,对学习过程建模在学习管理系统中的应用提出了展望。     

An extensible approach to visually editing adaptive learning activities and designs based on services

Learning management systems (LMS) provide an operational environment in which an online course can be created and later executed. Inter-operation between creators and their authoring facilities, and the LMS execution engine are based on defining standards and specifications, such as the IMS Learning Design (LD). Because an LMS better serves as a course player than as a course creator, a large number of approaches and environments for standards-compliant course authoring have been developed. These approaches and environments propose a number of issues that deal with how adaptations are edited and how to define the connection of learning activities with external learning applications and services. These questions have raised concern, mostly because of the excessive commitment of the creators’ methods and tools used with an educational modeling language, as well as the isolation of the language used to describe the course from the host LMS. This work describes an abstract, extendible language used to specify the learning design of a course, which can be transformed into any LD language as required by the execution environment. The language is used from a generative authoring environment that offers the possibility of editing web services as an additional resource to assess learning activities.     

基于PKI体系的安全电子邮件系统的研究与设计

电子邮件发展出现的问题主要表现为机密泄露、信息欺骗、病毒侵害、垃圾邮件等.相关机构对此现象做出了一些针对性的解决方案,如电子签名法、反垃圾邮件等与电子邮件安全相关法律法规的制定.安全电子邮件系统的建立是在普通电子邮件系统的基础上来实现的,是与PKI与之相关联的CA认证、数字证书、加密、数字签名等技术相结合而产生的,还利用了综合防病毒技术、反垃圾邮件技术,从而给使用电子邮件的用户创造了一个安全的使用环境.     

Understanding technology use in global virtual teams: Research methodologies and methods

Context

The globalisation of activities associated with software development and use has introduced many challenges in practice, and also (therefore) many for research. While the predominant approach to research in software engineering has followed a positivist science model, this approach may be sub-optimal when addressing problems with a dominant social or cultural dimension, such as those frequently encountered when studying work practices in a globally distributed team setting.The investigation of such a team reported in this paper provides one example of an alternative approach to research in a global context, through a longitudinal interpretive field study seeking to understand how global virtual teams mediated the use of technology. The study involved a large collective of faculty and support staff plus student members based in the geographically and temporally distant locations of New Zealand, the United States of America and Sweden.

Objective

Our focus in this paper is on the conduct of research in the context of global software activities, and in particular, as applied to the actions and interactions of global virtual teams. We consider the appropriateness of various methodologies and methods in enabling such issues to be addressed.

Method

We describe how we undertook a substantial field study of global virtual teams, and highlight how the adopted structuration theory, action research and grounded theory methodologies applied to the analysis of email data, enabled us to deliver effectively against our goals.

Results

We believe that the approach taken suited a research context in which situated practices were occurring over time in a highly complex domain, ensuring that our results were both strongly grounded and relevant to practice. It has resulted in the generation of substantive theory and techniques that have been adapted and applied on a pilot basis in further field settings.

Conclusion

We conclude that globally distributed teamwork presents a complex context which demands new research approaches, beyond the limited set customarily applied by software engineering researchers. We advocate experimenting with different research methodologies and methods so that we have a more rounded repertoire to address the most important and relevant issues in global software development research, with the forms of rigour that suit the chosen approach.     

基于ASP技术的计算机辅助工业设计系统的设计与研究

随着计算机网络技术的迅猛发展,全球经济面临着深刻的变革。计算机技术的发展使得制造业发生了很大变化。为了更好地将计算机技术应用到工业上去,本文提出了一种基于服务提供商模式的解决方案,用于解决计算机辅助工业设计中网络化制造的问题。本文设计并开发的系统由四个工具集构成,每个工具都是利用可重用组件技术进行开发,动态加载到计算机辅助工业设计平台中。本文重点研究了工具集中的形态布局、色彩方案、人机设计等技术,开发出的系统可以为企业提供一些基本的计算机辅助工业设计应用服务。实验表明,该系统能够提高企业的工作效率,提高企业的设计能力,对网络化制造业具有重要意义。