电子采购中的信息系统安全策略

电子采购中的信息系统安全策略包括：使用可设置登录权限的操作系统；数据库访问采用智能卡或动态认证口令卡；重要外网安装专用防火墙；重要内网安装网络入侵实时检测和漏洞扫描工具：建立多级病毒保护体系；采用黑客诱骗技术：利用用户智能卡、生物学特征或数字签名进行身份认证：网上支付使用信用卡、电子支票等；采用密钥加密技术；建立安全认证中心和支付网关；建立网络安全管理体制。     

基于 VCCP 的 QR 码安全认证方案

针对物联网感知层QR码标签的安全认证问题,提出采用可防欺骗的视觉加密(visual cryptography for cheating prevention,VCCP)解决方案.将CI(Choosing Interpolation)图像生成算法、Gabor算法及基于CB(Changing Bytes)消息摘要算法的RSA数字签名等理论运用在QR码安全认证方案中.结果表明:该方案能在应用上解决安全认证所存在的问题,但还存在抗攻击能力不够强等问题.     

智能客户端技术研究及应用

采用Net Framework和Windows窗体构建的智能客户端应用程序,采用缓存数据、数据并发技术及ADO.NET数据集实现数据管理.再通过SOAP在Web上提供的软件服务,使用WSDL文件进行说明,再使用UDDI进行注册实现XML Web Service.最后完成应用程序的偶尔连接及客户端的部署、更新.     

一种SOAP泛洪攻击效能模糊评估方法

鉴于SOAP协议本身固有的安全脆弱性可致网络及服务面临泛洪攻击的威胁,在深入研究提供网络系统安全及可靠性建设所需的效能评估技术基础上,针对灰色评估法的局限性,将模糊评估法引入SOAP泛洪攻击效能评估,建立SOAP泛洪攻击效能模糊评估模型,其核心为攻击评判矩阵的确立、隶属度矩阵的定制、指标权重的配置以及综合评估的实施。基于建立的攻击效能模糊评估模型,利用采集测量的样本数据进行了实例验证。验证结果表明：该方法更具适用性,不仅可以提供攻击效能的确定性评估结论,而且可以合理地区分攻击的有效程度。     

基于J2EE平台的互联星空3A系统

互联星空的3A系统方案,在一般信息层认证计费基础上,采用构件技术并结合J2EE设计理念实现.系统在认证、授权和支付方面分别采取截取过滤器、前控制器以及数据访问对象模式,同时运用构件技术实现模块动态组合.该方案提供增值服务和代收费机制,提升各消费层次的用户满意度,解决了互联网增值服务问题.     

基于分布服务器集中认证管理的垃圾邮件控制方案

基于分布服务器集中认证管理的垃圾邮件控制,将互联网垃圾邮件管理协会作为邮件服务器域名/IP的全球认证中心,各地ISP担任认证分中心角色.邮件服务器先向ISP认证分中心请求识别来源地址合法性.ISP认证再检查本地地址数据库或缓存,若能查到信息,则向邮件服务器发送是否合法信息,否则向上一级认证中心进行递归查询.邮件服务器在收到认证中心的反馈信息后,依发送方邮件域名及IP地址,进行处理或阻止不合法地址的发送.     

指挥控制系统的信息安全要素

指挥控制系统的信息安全包括保密通信、信息认证、入侵检测和病毒防范.系统易受攻击的环节是局域网与通信链路,需采取链路加密和端到端加密措施.报文信息的鉴别认证可采用差错控制码、报文鉴别码与数字签名进行.采用反常检测统计和基于规则的检测技术进行入侵检测.病毒防范可采用反病毒软件、防火墙、类属解密和数字免疫系统等新型反病毒措施.     

基于Web Services的管控一体化

基于Web Services的管控一体化系统,由服务实现层及应用层组成.实现层提供服务,其远程工控服务系统含监控设备和监控模块,管理系统含管理模块和数据源.应用层包括UDDI注册中心、SOAP路由器、服务组合库、实时处理系统、用户界面等.以一制造执行系统为例,采用Microsoft技术构建,其管理服务含生产计划及质量管理模块.每条生产线生产过程控制各由一个控制服务模块提供,信息实时处理器通过用户界面向管理员提供服务.     

装甲车辆远程故障诊断系统

装甲车辆远程故障诊断系统由现场监测诊断、网络传输通道、远程诊断服务中心构成.系统采用B/S结构,应用ASP QLServer2000及Html,JavaScript等建立远程故障诊断网站.先进行现场设备数据采集和状态监测,并故障诊断,然后请求进入诊断服务中心并传至诊断服务器.服务器调用智能系统,并请求数据库服务器和虚拟诊断平台提供支持,对现场状态进行监控和诊断决策.关键技术涉及远程协作网架构、数据库安全保密等.     

基于WEB的工作流管理系统研究与实现

基于web技术的工作流管理信息系统,分5个层次:第1层是基于WEB用户界面的客户层,仅仅向应用服务层发出请求.第2层是提供工作流应用的服务层,接受用户的请求,将请求传递给控制层.第3层是工作流运行环境的控制层,负责控制应用服务层和数据访问层的衍接.第4层是数据访问层.最后是数据存储层.     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Design and Analysis of Test Schemes of Static Postponing Time on Shrapnels Used to Riot Control

The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures,the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done,feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.     

Expert Systems Aimed at General Design of Projectiles

Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed.     

Design of Non-fragile Satisfactory Estimator for Linear Continuous Perturbed Stochastic Systems

The design problem of non-fragile estimator is addressed for a class of perturbed linear continuous systems. The perturbations occur on the plant and estimator parameters. The estimator designed should force the error system to achieve the desired decay rate and force the steady error variance less than the specified upper bound irrdevancy of the admissible plant perturbations and estimator perturbations. Consistency problem of the decay rate with the variance upper bound is first considered via linear matrix inequality （LMI） approach. The solution of the estimator parameter under specifications to be consistent is then discussed. The consistency condition of specifications and estimator parameter solution are transformed to feasible or minimum problems subject to a set of LMI respectively. The method is illustrated by a numerical example.     

An Improved Scene-based Nonuniformity Correction Algorithm for Infrared Focal Plane Arrays Using Neural Networks

The improved scene-based adaptive nonuniformity correction （NUC） algorithms using a neural network （NNT） approach for infrared image sequences are presented and analyzed. The retlna-like neural networks using steepest descent model was the first proposed infrared focal plane arrays （IRFPA） nonuniformity compensation method, which can perform parameter estimation of the sensors over time on a frame by frame basis. To increase the strength and the robustness of the NNT algorithm and to avoid the presence of ghosting artifacts, some optimization techniques, including momentum term, regularization factor and adaptive learning rate, were executed in the parameter learning process. In this paper, the local median filtering result of Xij （ n ） is proposed as an alternative value of desired network output of neuron Xij （ n ）, denoted as Tij （ n ）, which is the local spatial average of Xij （ n ） in traditional NNT methods. Noticeably, the NUC algorithm is inter-frame adaptive in nature and does not rely on any statistical assumptions on the scene data in the image sequence. Applications of this algorithm to the simulated video sequences and real infrared data taken with PV320 show that the correction results of image sequence are better than that of using original NNT approach, especially for the short-time image sequences （several hundred frames） subjected to the dense impulse noises with a number of dead or saturated pixels.     

Piecewise Filter of Infrared Image Based on Moment Theory

The disadvantages of IR images mostly include high noise, blurry edge and so on. The characteristics make the existent smoothing methods ineffective in preserving edge, To solve this problem, a piecewise moment filter （PMF） is put forward. By using moment and piecewise linear theory, the filter can preserve edge. Based on the statistical model of random noise, a related-coefficient method is presented to estimate the variance of noise. The edge region and model are then detected by the estimated variance. The expectation of first-order derivatives is used in getting the reliable offset of edge. At last, a fast moment filter of double-stair edge model is used to gain the piecewise smoothing results and reduce the calculation. The experimental result shows that the new method has a better capability than other methods in suppressing noise and preserving edge.     

Bistatic Sonar Localization Based on Best Linear Unbiased Estimation

A best linear unbiased estimation （BLUE） algorithm for bistatic sonar localization is proposed. The Cramer-Rao bound for bistatic Sonar and the geometrical dilution of precision （GDOP） in different conditions are given. The simulation results show that the location accuracy of BLUE algorithm is higher than the weighted least square method.