A secure routing model based on distance vector routing algorithm

Distance vector routing protocols have been widely adopted as an efcient routing mechanism in current Internet,and many wireless networks.However,as is well-known,the existing distance vector routing protocols are insecure as it lacks of efective authorization mechanisms and routing updates aggregated from other routers.As a result,the network routing-based attacks become a critical issue which could lead to a more deteriorate performance than other general network attacks.To efciently address this issue,this paper,through analyzing the routing model and its security aspect,and presents a novel approach on guaranteeing the routing security.Based on the model,we present the security mechanism including the message exchange and update message security authentication mechanism.The suggested approach shows that the security mechanism can efectively verify the integrity and validate the freshness of routing update messages received from neighbor nodes.In comparison with exiting mechanisms(SDV,S-RIP etc),the proposed model provides enhanced security without introducing significant network overheads and complexity.     

230 kt/a烟气制酸系统的运行及改造情况

介绍230kt／a诺兰达炉铜冶炼烟气制酸装置的运行及技术改造。装置采用稀酸洗净化、ⅣⅠ-Ⅲ Ⅱ“3 1”两转两吸工艺流程，运行中发现板式酸冷却器堵塞、电除雾器腐蚀、气体换热器积酸和漏气等现象，通过更换为阳极保护管壳式酸冷却器、在电除雾器前增设湍冲洗涤器、调整换热管的喷铝成分等措施，收到良好的效果。     

一种基于RFID的炼钢投入产出分析系统

为了控制物料消耗、降低吨钢成本,设计一种基于RFID的炼钢投入产出分析系统.     

Guaranteed transient performance based control with input saturation for near space vehicles

This paper describes the design of guaranteed transient performance based attitude control for the near space vehicle(NSV)with control input saturation using the backstepping method.To improve the robust controllability of the NSV,the parameter adaptive method is used to tackle the integrated effect of unknown time-varying disturbance and control input saturation.Based on the backstepping technique and parameter estimated outputs,a robust attitude control scheme is proposed for the NSV with input saturation.A novel robust attitude control scheme is then proposed based on a prescribed performance bound(PPB)which characterizes the convergence rate and maximum overshoot of the attitude tracking error.The closed-loop system stability under both the developed robust attitude control schemes is proved using Lyapunov’s method and uniformly asymptotical convergence of all closed-loop signals is guaranteed.Finally,simulation results are given to show the effectiveness of both the proposed robust constrained attitude control schemes.     

交流电量采集技术在LF炉的应用

介绍交流电量采集系统的设计,及其在LF精炼炉中的应用.     

工控设备的安全保密风险评估实践

近期披露的信息安全事件表明,工控系统已经成为国外信息安全攻击的主要目标,必须加强工控系统的信息安全防护。工控系统与办公系统不同,系统中使用智能设备、嵌入式操作系统和各种专用协议,尤其是智能设备具有集成度高、行业性强、内核不对外开放、数据交互接口无法进行技术管控等特点,工控系统的安全风险评估方法、标准还在不断探索中。本文介绍工控设备安全保密风险评估模型和评估流程,以数控设备840D为例,进行工控设备的安全保密风险评估,围绕工控设备全生命周期给出了安全保密防护和检测的建议。     

ZrO2对CaO-SiO2系玻璃析晶的影响

通过DSC曲线研究了不同含量的ZrO2对CaO-SiO2系玻璃析晶的影响,根据JMA方程计算动力学参数(如析晶活化能E、频率因子ν、晶化指数n)。从计算结果可以看出,随着ZrO2含量的增加,析晶活化能E减少,而频率因子ν和晶化指数n增加。当ZrO2含量为7%时,E值最小:235.58kJ/mol;n值最大:4.70。说明ZrO2在CaO-SiO2玻璃体系是有效的晶核剂。     

具有核壳相反转特性的丙烯酸酯/硅氧烷共聚乳液的合成

以丙烯酸丁酯，甲基丙烯酸甲酯，八甲基环四硅氧烷和适量γ－甲基丙烯酰氧丙基三甲氧基硅烷为原料，以过硫酸铵和十二烷基苯磺酸为复合引发催化剂，采用一步乳液聚合法（即自由基共聚与缩聚反应同步进行），制成了涂料用，具有核壳结构的丙烯酸酯（核）／硅氧烷（壳）共聚乳液，考察了聚合温度，硅氧烷用量，乳化剂种类，乳液放置时间对共聚物乳胶粒形态及其粒径的影响，结果表明，乳液放置一定时间后，乳胶粒结构发生相反转，最终变成以聚硅氧烷为核，聚丙烯酯酯为壳的热力学稳定结构。     

化学工程中多目标遗传算法的应用

多目标遗传算法(MOGA)是在遗传算法的基础上发展起来的,它可以进行多个目标之间直接权衡.介绍了多目标遗传算法的概念及发展历程,重点介绍了非劣排序遗传算法(NSGA)和NSGA-Ⅱ,以及多目标遗传算法和过程模拟器结合在化学工程中的应用情况.