行波推进仿生机器鱼

介绍5种常见的鱼类游动模式,分析讨论仿生机器鱼的生物学原型。基于对裸臀鱼属(gymnarchus niloticus)与裸背鳗属(gymnotus carapo)活体鱼的实验研究,建立了长背鳍扭转行波动态曲面的数学模型。依靠长鳍行波实现推进与控制的新型仿生机器鱼,其基本结构是"刚性身体"与"柔性背鳍"的组合,这有利于改善现有摆动式机器鱼的技术性能。裸臀鱼属与裸背鳗属鱼类可作为发展特种机器鱼潜艇的生物学原型,以提高现行水下航行器的效率和机动性能。     

Network disconnection problems in a centralized network

We consider three network disconnection problems in a centralized network where a source node provides service to the other nodes, called demand nodes. In network disconnection problems, each demand node gets a certain benefit when connected to a source node and a network attacker destroys edges to prevent demand nodes from achieving benefits. As destroying edges incurs expenses, an attacker considers the following three different strategies. The first is to maximize the sum of benefits of the disconnected nodes while keeping the total edge destruction cost no more than a given budget. The second is to minimize the total destruction cost needed to make a certain amount of benefits not accomplished. The last is to minimize the ratio of the total destruction cost to the benefits not accomplished. In this paper, we develop exact algorithms to solve the above three problems. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

程控交换机硬件系统建模研究

底层功能实现模块是程控交换机多媒体仿真训练系统通用设计平台的关键部分。硬件配置是交换机工作的基础 ,是底层功能实现模块的重要组成部分。该文介绍了交换机硬件系统的建模 ,利用两种典型机型硬件实际的工作情况 ,解释并验证了所建立的通用功能流程图 ,并介绍了参数接口的管理与应用