一种工控领域内存数据库的设计与实现

设计与实现了一种工控领域的内存数据库.给出了各模块的具体实现方法,重点给出了适合实时数据库特点的实时事务管理的方法和流程.在实际应用中,能够稳定而高效的运行.     

电力行业安全生产的管理思考

企业安全生产是我国各行业生产建设中的首要因素,它不仅是企业发展的基础也是我国安监部门监管的重点.电力能源作为国家的重要能源之一,它的安全管理关系着人民的日常生活、社会进步、经济持续发展等问题.电力企业安全生产时国家安全生产建设中的一个重要领域,时电力企业建设中的基本方针.目前,电力行业正处于改革时期,电力安全既是改革至关重要的一个环节,同时也检验着电力改革的成功与否.在电力生产中要想达到安全生产规定的标准就要落实各级领导责任、加强安全管理,使安全生产这一口号落到实处.     

电子军务系统中T-RBAC访问控制组件的设计与应用

电子军务信息系统虽然运行于相对安全的军队内联网中,但仍面临多种不安全因素。 针对其中破坏认证、破坏访问控制两种主要的威胁,提出结合部队编制、人员职务、角色分 工和业务工作流,以任务为中心进行认证与访问控制,从而保护业务系统操作和数据安全的 思想。利用公开密钥基础设施(PKI)和轻量级目录访问协议(LADP)设施实现了基于数字证书 的统一认证以及任务与角色结合的T-RBAC 访问控制组件。在司政后多种业务系统中的实际应用结果显示,该安全组件能够对用户访问 和操作权限进行严格、规范和灵活地控制,有效保证系统、工作流和数据的安全。     

无源多基地雷达中一种综合航迹处理方法

本文对基于调频广播信号的无源多基地雷达系统中的目标跟踪问题进行了研究,提出了一种综合航迹处理方法.本文将航迹划分为四种状态,即起始航迹,试验航迹,确认航迹,以及消亡航迹,详细介绍了每一种航迹的处理方式.本文顺序地利用每个接收-发射对的观测量来更新航迹,以减小算法复杂度.仿真实验与实测数据结果证明了本文算法的有效性.     

Timing and hamming weight attacks on minimal cost encryption scheme

The timing and Hamming weight attacks on the data encryption standard (DES) cryptosystem for minimal cost encryption scheme is presented in this article. In the attack, timing information on encryption processing is used to select and collect effective plaintexts for attack. Then the collected plaintexts are utilized to infer the expanded key differences of the secret key, from which most bits of the expanded secret key are recovered. The remaining bits of the expanded secret key are deduced by the correlations between Hamming weight values of the input of the S-boxes in the first-round. Finally, from the linear relation of the encryption time and the secret key's Hamming weight, the entire 56 bits of the secret key are thoroughly recovered. Using the attack, the minimal cost encryption scheme can be broken with 223 known plaintexts and about 221 calculations at a success rate a＞99%. The attack has lower computing complexity, and the method is more effective than other previous methods.     

W波段三维近场安检成像系统

本文介绍了一套基于频率步进体制的W波段三维近场安检成像系统以及相应的成像算法。W波段信号可以穿透普通衣物,对人员携带的藏匿物品进行成像。成像算法通过在频率波数域进行插值处理可以完全补偿近场的波前曲面。文中阐述了频率波数域的插值过程以及实验数据的预处理过程。成像系统通过发射宽带信号得到高分辨距离像,通过提高工作频率得到高分辨方位像,方位向分辨率优于5mm。成像实验结果表明该系统性能优于现有的Ka波段成像系统。     

广播电视新闻融合媒体平台规划设计

青海广播电视台为打造一个支持“全媒体、全业务、全流程、全覆盖、全扩展”适应未来发展需要的一体化平台.拟将新闻中心改造为高清采编基础上基于云计算技术的全媒体融合新闻平台.从系统规划、整体架构、关键技术等方面介绍了系统总体规划,从资源层、业务层、管理层三个方面分析了系统支撑云平台核心点设计.     

PUFPass: A password management mechanism based on software/hardware codesign

Secure passwords need high entropy, but are difficult for users to remember. Password managers minimize the memory burden by storing site passwords locally or generating secure site passwords from a master password through hashing or key stretching. Unfortunately, they are threatened by the single point of failure introduced by the master password which is vulnerable to various attacks such as offline attack and shoulder surfing attack. To handle these issues, this paper proposes the PUFPass, a secure password management mechanism based on software/hardware codesign. By introducing the hardware primitive, Physical Unclonable Function (PUF), into PUFPass, the random physical disorder is exploited to strengthen site passwords. An illustration of PUFPass in the Android operating system is given. PUFPass is evaluated from aspects of both security and preliminary usability. The security of the passwords is evaluated using a compound heuristic algorithm based PUF attack software and an open source password cracking software, respectively. Finally, PUFPass is compared with other password management mechanisms using the Usability-Deployability-Security (UDS) framework. The results show that PUFPass has great advantages in security while maintaining most benefits in usability.     

Study on distributed and dynamic resource management for delay-sensitive sensor network

The delay-aware dynamic resource management problem was investigated in sensor network,with a focus on resource allocation among the sensors and power control along the time.By taking account of average delay requirements and power constraints,the considered problem was formulated into a stochastic optimization problem.Inspired by Lyapunov optimization theory,the intractable stochastic optimization problem was transformed into a tractable deterministic optimization problem,which was a mixed-integer resource management problem.By exploiting the specific problem structure,the mixed-integer resource management problem was equivalently transformed into a single variable problem,and the cooperative distributed method was present to effectively solve it with guaranteed global optimality.Finally,a dynamic resource management algorithm was proposed to solve the original stochastic optimization problem.Simulation results show the performance of the proposed dynamic algorithm and reveal that there exists a fundamental tradeoff between delay requirements and power consumption.     

游乐场设备机械设计问题分析

随着快节奏化都市的迅速发展,在城市工作、学习、生活的人们的精神压力越来越大,使得人们对于精神层面需求的满足越来越强烈.于是,多种多样的休闲娱乐项目应运而生.随着日益增长的生活水平,人们闲暇时间更多追求身心的放松,以缓解紧张的工作学习情绪,而游乐场成为人们短期假期休闲的不二去处.近年来,游乐场的发展十分迅速.然而,在游乐场建设发展过程中,安全问题一直是社会各界密切关注的问题.本文分析游乐场设备机械设计问题,希望提高游乐场机械设备质量的整体水平,实现良好的经济效益和社会效益.