Routing technology is a key technology of the Ad Hoc network, and it is also one of the most important factors that affect the performance of the network as a whole. As the routing protocols in the traditional fixed networks no longer adapt to the dynamic changes in the topology of Ad Hoc Networks, new Ad Hoc routing protocols must be redesigned. Starting from the basic concept of the Ad Hoc network, an ad hoc network communication effective key agreement protocol based on bilinear pairings and hierarchical routing protocols is proposed. It supports the establishment and dynamic update of initial group secret key and has less traffic that corresponds to the logical key agreement model and actual network topology. The experiment and performance analysis show that the proposed protocol is very effective in the situation of large range, strong ability of equipment processing and poor network com-munication environment.

1 引言 协同策略除了包括通常的存取控制规则、并发控制规则、发言权控制规则外,还应包括协同感知控制规则、数据分布方案、角色行为准则和例外处理等.这些协同策略通常因工作方式和工作组的组织结构不同而不同,即便同一个组在协作中的不同阶段也可能采用不同的协同策略.因此协同系统的开发应是启发式的,协同策略的定义通常需要最终用户、系统开发者和某些领域的专家进行不断交互和扩充.

并行工程与计算机支持的协同工作的有机结合是并行工程理论与应用的发展趋势之一.本文分析了面向并行工程的计算机支持的协同系统的特点与功能需求,重点研究了协同设计系统开放式实现的用户界面定制与裁剪及其映射机制和共享工作空间一致性管理,给出了一个具有柔性机制的系统层次模型,讨论了用户之间的界面裁剪与映射方法,以及感知处理,并用符号表示描述了系统的实现.

Based on the perspective of dividing the total QoS requirement of delay bound into local QoS requirements among links along the path, the authors examine the constraint conditions of resource reservation for satisfying end to end delay bound, present a new cost function for resource allocation and a method of the resource allocation for the links according to the principle of cost minimization, and give a distributed three\|phase resource reservation algorithm in this paper. The purpose is to make the use of network resources more balanced and more reasonable in order that more call requests can be admitted in future. Furthermore, also discusse resource reservation processing for multicast connection establishment to which the method is applied. Finally, the results of simulations for the method are given and the effectiveness of the method is confirmed.

在协作应用系统中,灵活、方便而又自适应的工作空间感知是提高工作组协同效率和加快协作任务进程的重要手段.文中提出一种协同系统中工作空间感知处理模型,该模型把所有共享的对象置于一个全总集合中,视为广义的空间场所,按各用户工作职责范围划分为个人专注场所和按各用户所在的操作对象位置划分为影响工作场所,依据各场所的接近程度,确定用户间的行为感知强度,从而研制感知信息收集、发送算法和感知信息理解表示方法.该模型是按需传输感知信息,可减少网络的信息流通量.该模型为一般协同应用系统的感知处理和界面重耦合提供了有效的方法.

CSCW systems introduce new requirements for access control, which cannot be met by using existing models. In this paper, a new role based access control model, RBCSAC (role based collaborative systems access control), is introduced to meet these requirements. This model formally describes the relationship between the key elements of access control such as data, operation, privilege, role and user. It provides the method for recording access control information. The model grants and revokes access privileges of cooperative users by assigning them some roles and canceling their roles. Two role assignment rules are also provided and two operation legality checking rules. RBCSAC model is brought forward aiming at accommodating with the characteristics of collaborative systems such as multi user, interaction, collaboration, real time, dynamic. This model can meet the requirements for access control in CSCW systems adequately.

本文介绍了计算机辅助陶瓷产品造型设计系统的设计方法和主要功能。本系统提供了真实感图形的显示,图形逼真,自然。在处理真实感图形中,采用了较合适的花纹映射和光源球面缓冲法处理阴影,使图形生成的真实性和实时性得到较好的统一。