STD总线与BITBUS网络通信接口的设计与实现

本设计按照BITBUS的通信规程,吸收相应的硬软件产品,实现了实时性和可靠性较好的网络接口设计,构成符合STD规范的分布式控制系统,将两种BUS融为—体开拓更广泛的应用领域.     

基于消息的网络通讯模式

本文提出了一种基于消息的网络通讯模式，在该模式中，应用程序通过定义消息来描述通讯的内容，利用消息过滤器实现应用程序间的点对点、广播、客户／服务器等模式的通讯。该模式适用于多个应用程序间协同工作，这些应用程序可以分散于以ＴＣＰ／ＩＰ为协议的网络站点上。     

Affirmative action algorithms

Affirmative action is a new variety of selection rule which employs historical information to favor the choice of elements that have not been selected in the past. We categorize three implementations of this principle and discuss their application to the simplex method, to Bard-type schemes for the linear complementarity problem, and to augmenting path methods for network flow problems. We present analytical and computational results, and some open questions.Research supported by the Georgia Institute of Technology.Research supported by the New Faculty Research Development Program of the Georgia Institute of Technology. Reproduction in whole or in part is permitted for any purpose of the U.S. Government.     

Proving total dual integrality with cross-free families—A general framework

We present a theorem stating that certain classes of linear programming problems have integer optimal (primal and dual) solutions. The theorem includes as special cases earlier results of Johnson, Edmonds and Giles, Frank, Hoffman and Schwartz, Gröflin and Hoffman, and Lawler and Martel. The proof method consists of deriving total dual integrality for the corresponding system of linear inequalities from the total unimodularity of certain ‘cross-free’ subsystems. The scheme presented here differs from the one proposed earlier by Grishuhin in that Grishuhin requires the total unimodularity of cross-free subsystems in the axioms, whereas here this follows from easier verifiable axioms.     

网络环境下会计业务的发展与探讨

随着网络技术、计算机技术在会计领域的应用和发展 ,网络会计应运而生。本文着重探讨了网络会计的产生、主要特征、基本架构、基本要求     

Optical network design with mixed line rates

Future telecommunication networks employing optical wavelength-division multiplexing (WDM) are expected to be increasingly heterogeneous and support a wide variety of traffic demands. Based on the nature of the demands, it may be convenient to set up lightpaths on these networks with different bit rates. Then, the network design cost could be reduced because low-bit-rate services will need less grooming (i.e., less multiplexing with other low-bit-rate services onto high-capacity wavelengths) while high-bit-rate services can be accommodated on a wavelength itself. Future optical networks may support mixed line rates (say over 10/40/100 Gbps). Since a lightpath may travel a long distance, for high bit rates, the effect of the physical impairments along a lightpath may become very significant (leading to high bit-error rate (BER)); and the signal’s maximum transmission range, which depends on the bit rate, will become limited.In this study, we propose a novel, cost-effective approach to design a mixed-line-rate (MLR) network with transmission-range (TR) constraint. By intelligent assignment of channel rates to lightpaths, based on their TR constraint, the need for signal regeneration can be minimized, and a “transparent” optical network can be designed to support all-optical end-to-end lightpaths. The design problem is formulated as an integer linear program (ILP). A heuristic algorithm is also proposed. Our results show that, with mixed line rates and maximum transmission range constraints, one can design a cost-effective network.     

开放仪器管理

中国科学院上海有机化学研究所通过开放上机提高Varian公司Mercury-plus 300 MHz超导核磁共振仪器的使用效率，使用该公司的氘梯度匀场方法及软件的Glide用户接口简化仪器操作步骤，使用网络传递谱图，使用身份识别系统控制仪器使用.     

基于基础设施体系的电子政务综合安全系统研究

文章首先分析了电子政务对网络安全的需求。然后在现有基础设施体系的基础上提出了一个具有五个子系统的电子政务综合安全系统，从技术角度分析了一个合格的电子政务安全系统应该具有哪些功能．然后用一个实例对该系统的实现进行了说明。最后分析了影响电子政务网络安全的非技术因素，指出必须全面考虑才能真正实现电子政务的网络安全。     

浅谈中国电信网络管理

本文介绍了全国电话网管系统及各专业网管系统的和实施情况，分析了中国电信网管系统的特点，现状和走向，指出了网管在整个电信网运行维护管理工作中的龙头地位。     

Designing two-echelon supply networks

A modern distribution network design model needs to deal with the trade-offs between a variety of factors, including (1) location and associated (fixed) operating cost of distribution centers (DCs), (2) total transportation costs, and (3) storage holding and replenishment costs at DCs and retail outlets. In addition, network design models should account for factors such as (4) stockouts, by setting appropriate levels of safety stocks, or (5) capacity concerns, which may affect operating costs in the form of congestion costs. The difficulty of making such trade-offs is compounded by the fact that even finding the optimal two-echelon inventory policy in a fixed and uncapacitated distribution network is already a hard problem. In this paper, we propose a generic modeling framework to address these issues that continues and extends a recent stream of research aimed at integrating insights from modern inventory theory into the supply chain network design domain. Our approach is flexible and general enough to incorporate a variety of important side constraints into the problem.