网络安全等级保护测评中测评结论的度量方法优化

文章分析了网络安全等级保护2.0时期国家标准的新变化对等级测评结论可能产生的影响,并用实际案例和数据论述了以往描述的基于测评指标和基于测评对象的定量分析方法存在的局限性。根据网络安全等级保护国家标准结构和内容的新特点,结合新的等级测评结论表述方法,文章提出了调整和优化定量计算产生等级测评结论的思路,给出了缺陷扣分的原理和缺陷扣分的定量计算方法,并比较了各种定量计算方法在计算结果上的差异,提出了适合新标准的测评结论定量计算公式。     

Knowledge-Based Virtual Modeling and Simulation of Manufacturing Processes for Industry 4.0

Abstract

Industry 4.0 aims at providing a digital representation of a production landscape, but the challenges in building, maintaining, optimizing, and evolving digital models in inter-organizational production chains have not been identified yet in a systematic manner. In this paper, various Industry 4.0 research and technical challenges are addressed, and their present scenario is discussed. Moreover, in this article, the novel concept of developing experience-based virtual models of engineering entities, process, and the factory is presented. These models of production units, processes, and procedures are accomplished by virtual engineering object (VEO), virtual engineering process (VEP), and virtual engineering factory (VEF), using the knowledge representation technique of Decisional DNA. This blend of the virtual and physical domains permits monitoring of systems and analysis of data to foresee problems before they occur, develop new opportunities, prevent downtime, and even plan for the future by using simulations. Furthermore, the proposed virtual model concept not only has the capability of Query Processing and Data Integration for Industrial Data but also real-time visualization of data stream processing.     

Copy-move forgery detection of duplicated objects using accurate PCET moments and morphological operators

This paper presents a new method for copy-move forgery detection of duplicated objects. A bounding rectangle is drawn around the detected object to form a sub-image. Morphological operator is used to remove the unnecessary small objects. Highly accurate polar complex exponential transform moments are used as features for the detected objects. Euclidian distance and correlation coefficient between the feature vectors are calculated and used for searching the similar objects. A set of 20 forged images with duplicated objects is carefully selected from previously published works. Additional 80 non-forged images are edited by the authors and forged by duplicating different kinds of objects. Numerical simulation is performed where the results show that the proposed method successfully detect different kinds of duplicated objects. The proposed method is much faster than the previously existing methods. Also, it exhibits high robustness to various attacks such as additive white Gaussian noise, JPEG compression, rotation, and scaling.     

Multilayer thermal object identification in frequency domain using IR thermography and vector fitting

This paper deals with the identification of the thermal parameters of multilayer objects using the concept of thermal impedance. In order to perform such identification, temperature evolution in time is obtained by an infrared camera after power excitation is applied in the investigated structure. Infrared thermography offers the advantage of being a noncontact temperature detection and measurement method. In many practical cases, it is impossible to use contact temperature measurements. Typically, the power in the form of a step function is applied. In order to calculate the thermal impedance of an object, temperature and power are converted into the frequency domain using the Laplace transform for s = jω. Then, the poles of the thermal impedance are identified using vector fitting, which allows calculating the thermal impedance as a sum of partial fractions. This corresponds directly to the Foster network of a thermal object. In addition, the vector fitting method offers much better convergence in comparison with other methods using the polynomial rational approximation of thermal impedance. A considerable improvement of the numerical Laplace transform in high frequency range is proposed. In this approach, the variable s = jω is replaced by , and then, the integration result is corrected by the Taylor series. It leads to a kind of filtering of the temperature signal.     

天文测量在测量空中飞行物测控系统中的应用

就天点建设有天经度、纬度、方位角的测量方法及求解方法进行介绍，对其测量精度进行讨论，供测控空中飞行物建立天点参考。     

德国现代建筑运动中的中国学者

李承宽先生的一生是伴随着德国现代建筑运动发展的一生，与他同行，我们身临其境地认识了H．波尔兹克。E．门德尔松和德国的“表现主义建筑”；认识了H．夏隆。H．黑林与德国的“精神建构”和“有机建靠”；认识了“虚质核心”的“李空间”；我们通过他可以对德国现代建筑思想的源流和德国现代建筑运动的发展窥见一斑。他代表了中国留学者在海外奋斗的一生和由他们所带来的优秀中国文化在推动世界现代运动中所作出的贡献。     

耗能减震加固结构的性能水准与设防目标

以国内外有关结构性能水准和性能目标的主要研究结果为基础 ,根据耗能减震加固结构的特点 ,结合我国《建筑抗震设计规范》(GB5 0 0 11 2 0 0 1)的要求和基于性能抗震加固设计理论 ,将耗能减震加固结构的性能分为四个水准 :健康、亚健康、病态、生命安全。针对不同重要性类别的建筑提出了三个层次的设防目标 :“小震不坏 ,中震可修 ,大震不倒”、“中震不坏 ,大震可修”、“大震不坏”。最后 ,将设防目标进行了量化。     

博物馆文物的防震保护研究--设防地震动输入及文物防震保护参数的确定

通过对上海市及邻近地区地震危害性分析,根据上海博物馆文物防震保护的具体要求,研究确定了该博物馆文物防震保护的设防水准及地震动参数。又根据上海博物馆建筑的结构特征分析,结合建筑结构动力特征的实测结果,计算得到了在给定设防地震动水准下,博物馆建筑物内各个楼层的地震动反应。通过分析馆藏文物的悬吊、固定、浮放等基本放置形式,探讨了文物的陈列特征及其可能造成的震害因素。根据相关浮放物在地震作用下的计算方法、上海博物馆文物的陈列特征及防震设计参数,给出了简便实用、偏于安全的计算模型。结果表明,在现有的抗震设防水准下,遇有大震或中震发生时,目前陈列状态的绝大多数文物均存在倾覆和滑移安全隐患。结果还表明,在上海博物馆4层楼板面地震动从566gal减小到110gal时,绝大多数文物均满足稳定条件。因此,通过选择合适的减震或隔震方法,使得文物所受到的地震动满足小于110gal时,便可使陈列文物在地震中免遭破坏,达到防震保护的目的。     

地震作用下建筑室外安全距离的界定

首先简单叙述了地震对建筑室外安全距离的影响,建立了地震作用下一般坠落物体的数据模型.而后通过对坠物有阻力下落运动分析和建筑动力计算,揭示了地震作用下建筑室外安全距离的界定方法.最后为确保其可操作性,引入一个真实工程,进行了实例验证.     

基于ModelBulider的城市部件数据建库

城市部件数据建库是将城市部件外业普查成果CAD图形转换为SHP格式,并增加权属数据、网格编码和部件编码等属性信息的过程。该过程数据处理操作工作量大,并且处理流程稳定,重复性强。使用ModelBuilder模型构建器制作城市部件数据处理模型,依次调用数据处理工具,可以自动完成数据处理工作,减少大量重复工作。