基于物联网温室群温湿度监控系统的设计与实现

随着物联网技术的飞速发展,本文针对温室环境控制中的问题,设计了基于物联网温室群温湿度的监控系统。系统采用STM32为控制核心,温室环境参数通过ZigBee网络传输给上位机,上位机则通过GSM模块实现对系统的远程控制。本文设计了树型网络,同时利用LabVIEW实现了用户界面。经现场测试,系统的稳定性较高,满足了设计要求。     

Intranet的安全及群密码系统

Intranet 的广泛应用使得它的安全越来越被人们所重视．本文首先对Intranet和Internet进行比较,提出Intranet存在的安全问题;然后介绍了一种面向Intranet内部群的加密方式,对于通过WWW服务器在群内共享的数据,就可用这种方法产生的群密钥进行加密;最后分析了该方法的特点．     

基于VC-DRSA的信息系统多属性群决策安全评估

以某高校校园网络系统作为评估样本,在建立了信息系统安全属性模型的基础上,提出了基于变一致性优势关系粗糙集（VC—DRSA）的多属性群决策的安全评估方法。该方法将VC-DRSA与层次分析法（AHP）相结合,利用VC-DRSA分类质量的概念挖掘出隐含在数据背后的内在规律,在确定安全属性权重的基础上,对信息系统进行了综合安全评估。实例计算证明,该方法可以有效地解决多属性群决策的“瓶颈”问题,在信息系统安全评估中具有实际意义。     

黄河水资源矛盾及其出路探讨

针对黄河水资源日前紧张的状况，分析了龙羊峡和刘家峡水库蓄水黄河下游的影响，提出了解决缺水问题的几条出路：（１）黄河上游水库群应从整体利益出发，尽可能满足水资源综合利用的要求，龙羊峡水库远在上游，其运行应重点考虑发电，而刘家峡水库应减少冬季泄量，更多地考虑宁蒙河段防凌，灌溉和防洪要求；（２）应促使大柳树反调节水库尽快兴建；（３）小浪底水库建成后，应以保证下游防洪，供水和减淤为主，而三门峡水库则应以加     

正交特征群

本文在证明了有限Ａｂｅ１群Ｇ与它的特征群Ｇ√存在同构的一个必要充分条件之后，构造了一类正交特征群，从而概括了相当一大类正交变换（它包括了离散付里叶变换、阿达玛变换、数论变换、Ｃｈｒｅｓｔｅｎｓｏｎ变换）这对构成有限域与整环上的正交变换具有指导作用。     

Dynamic group multicast routing with bandwidth reservations

Multicasting refers to the transmission of data from a source node to multiple destination nodes in a network. Group multicasting is a generalization of multicasting whereby every member of a group is allowed to multicast messages to other members that belong to the same group. The routing problem in this case involves the construction of a set of low cost multicast trees with bandwidth requirements, one for each member of the group for multicasting messages to other members of the group. In this paper, we examine this routing problem with an additional requirement that member nodes are allowed to join and leave the multicasting group anytime during a session. We call this problem, the dynamic group multicast routing problem (DGMRP). In this paper, we proposed three heuristic algorithms to generate a set of low cost multicast trees with dynamic group membership. Results from our empirical study shows that the one of the proposed algorithms, called Maximum bandwidth bottleneck path selection algorithm (MBBPS), achieves better utilization of bandwidth resources as compared with the other two algorithms which are based on a greedy approach. In addition MBBPS performs better in terms of cost when the bandwidth is not sufficient in the network. Copyright © 2002 John Wiley & Sons, Ltd.     

Settlement of Internal Cutthroat Competition Amid IT Group Companies: Away from "Prisoners'' Dilemma" of Price Wars

Cutthroat competition amid subsidiary companies of IT Group Company due to immanent characteristics of IT industry and grouping management mechanism infringes upon the collective profits. Two ways to avoid cutthroat competition of group company with game theory are studied: the assessment objective made by IT group company for subsidiary companies focuses on profits not revenue;the supervisory department of group company shall intensify law enforcement strength and give severe punishment against illegal depreciation of the subsidiary company.     

Settlement of Internal Cutthroat Competition Amid IT Group Companies: Away from “Prisoners' Dilemma” of Price Wars

Cutthroat competition amid subsidiary companies of IT Group Company due to immanent characteristics of IT industry and grouping management mechanism infringes upon the collective profits. Two ways to avoid cutthroat competition of group company with game theory are studied:the assessment objective made by IT group company for subsidiary companies focuses on profits not revenue; the supervisory department of group company shall intensify law enforcement strength and give severe punishment against illegal depreciation of the subsidiary company.     

集团客户通信网管系统的建设和应用探讨

通过对集团客户通信网管系统建设的必要性和重要性进行详细阐述,对客户通信网管系统建设需求进行分析,对客户通信网管系统在山西省内的应用进行研究,对客户通信网管系统功能进行探讨,供业界同行参考。     

超代数结构的几个问题

讨论了群的超群上的超群，超环以有自由群上的超群等问题。