无线传感器网络中一次性数字签名算法设计

一次性数字签名算法是构造密码协议的基础算法,可用于认证无线传感器网络(WSN)中传输数据的真实性和完整性。针对WSN的应用需求,给出一种高效的一次性数字签名算法。与现有一次性签名算法相比,该算法生成签名简单快捷,只需执行一次模指数乘法运算;签名长度短,只需传输一个群元素;适用范围广,能根据待签名消息的长度自动适配对应的公钥参数,该特性非常适合WSN中数据传输量较小的应用;同时该算法还能在标准模型下得到形式化的安全证明,其抗伪造攻击安全性可归约为双线性映射群中计算的Diffie-Hellman数学难题。     

基于CORBA的分布式事务处理分析

分析了在事务对象服务(OTS)下的分布式事务处理.使用OTS将分布式对象技术与事务处理技术结合起来,利用两阶段提交协议和恢复日志等技术,有效地保证了分布式事务的ACID性质.最后在了解了OTS体系结构的基础上,描述了OTS事务的执行与分解.     

对象事务服务与数据库集成机制研究

在分布式事务处理系统中需要持久存储的数据资源的参与来保证事务的持久性,数据库系统（DBMS）的广泛使用为事务系统提供了丰富的数据源,将分布式事务系统同现有的数据库系统的集成具有非常重要的意义,本文研究了通用请求代理体系结构（CORBA中的对象事务服务（OTS）和关系数据库系统的集成机制,提出了对象事务服务和数据库系统集成模型,设计并实现了数据库连接器DBConnector,完成了事务服务系统和数据库系统的无缝集成。     

三峡电站模拟操作及运行方式管理系统的研究与实现

探讨了水电站培训仿真系统的主要用途及典型配置,然后详细描述了三峡模拟操作及运行方式管理系统的主要功能,最后介绍了本系统的关键技术-自主研发的Simulog语言。Simulog是中水科技自主创新的面向水电站仿真的过程模型描述语言,可以实现控制流程和水电站设备数学模型的计算机描述和解析运行。通过对水电站运行人员模拟倒闸操作并检查正确性,确保运行操作工单的正确性,提高了对运行方式管理的可追溯性,杜绝误操作,模拟操作及运行方式管理系统作为运行人员的操作培训平台提高操作质量,达到安全性评价的要求。     

炼油化工操作仿真培训系统的应用及进展

本文回顾了炼油化工操作仿真培训系统的发展历程,简单介绍了该系统的组成,在炼油化工装置中的应用情况及在新技术下的技术进展。     

Operator training simulators for biorefineries: current position and future directions

Recent technological advances in the development of alternative energy sources, including biofuels, for transportation and energy requirements have demonstrated the need for highly skilled engineers and operators in the biotechnological industries. Although operator training simulators (OTS) used in the traditional chemical process industries may be used to train biorefinery operators and engineers, several distinct aspects of bioprocess operations make their direct application limited. The development and deployment of OTSs for use in biotechnological processes is therefore beginning to gain increasing attention. This review paper examines the present status of OTS development and use in biorefineries, including future considerations on how an OTS may be used to improve operator competence, maximise biorefinery operational efficiencies and protect people and the environment. The general premise of an OTS is that model‐based operator training simulators can be used to verifiably enhance the training of industrial operators to run complex biorefineries. Only a few examples of the design and application of OTSs in large‐scale biorefineries have so far been reported. A discussion of the mathematical models used for OTS development is briefly presented, as well as available OTS design frameworks and vendors, including their benefits and drawbacks. The review concludes by looking at possible future directions of OTS development and use in biorefineries and their contribution in facilitating the transition to a bio‐based economy. © 2018 Society of Chemical Industry     

多壁碳纳米管在不同表面功能基团自组装膜上的沉积

制备了表面功能基团为氨基和甲基的自组装膜,将不同表面功能基团自组装膜浸入多壁碳纳米管分散液中沉积,实验观察到,表面为氨基的APTES自组装膜对分散液中的碳纳米管有静电吸附作用而均匀吸附一层碳纳米管,表面为甲基的OTS自组装膜对分散液碳纳米管有排斥作用力而没有吸附碳纳米管,这一实验对利用单根碳纳米管构造纳米电子器件与纳米机械具有重要意义。     

Friction and Wear Studies of Octadecyltrichlorosilane SAM on Silicon

A self-assembled monolayer of octadecyltrichlorosilane (OTS) was prepared on a single-crystal silicon wafer (111) and its tribological properties were examined with a one-way reciprocating tribometer. The worn surfaces and transfer film on the counterface were analyzed by means of scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that, due to the wear of the OTS monolayer and the formation of the transfer film on the counterpart ball, the friction coefficient gradually increases from 0.06 to 0.13 with increasing sliding cycles and then keeps stable at a normal load of 0.5N. The transfer film is characterized by deposition, accumulation, and spalling at extended test duration. Though low friction coefficients of the monolayer in sliding against steel or ceramic counterfaces are recorded, poor load-carrying capacity and antiwear ability are also shown. Moreover, the monolayer itself or the corresponding transfer film on the counterface fails to lubricate even at a normal load of 1.0N. Thus, the self-assembled monolayer of octadecyltrichlorosilane can be a potential boundary lubricant only at very low loads.     

三峡电站模拟操作及运行方式管理系统的研究与实现

通过对水电站运行人员模拟倒闸操作并检查正确性,确保运行操作工单的正确性,提高对运行方式管理的可追溯性,杜绝误操作;模拟操作及运行方式管理系统作为运行人员的操作培训平台提高操作质量;达到安全性评价的要求。本文首先探讨了水电站培训仿真系统的主要用途及典型配置,然后详细描述了三峡模拟操作及运行方式管理系统的主要功能,最后介绍了本系统的关键技术-自主研发的Simulog语言。Simulog是中水科技自主创新的面向水电站仿真的过程模型描述语言,可以实现控制流程和水电站设备数学模型的计算机描述和解析运行。