国家信息安全产品认证管理委员会成立信息安全产品认证"天下一统"

4月19日，“国家信息安全产品认证管理委员会成立大会”在京召开，标志着我国建立统一的信息安全产品认证认可体系已进入实质性的实施阶段。国务院信息化工作办公室常务副主任曲维枝、国家质量监督检验检疫总局局长李长江、国家认证认可监督管理委员会主任王凤清出席了会议。     

加强信息安全产品认证认可工作,保障国家信息安全--4月19日在国家信息安全产品认证管理委员会成立会上的讲话

近年来，信息安全产品认证认可工作取得了新的进展：理清了工作思路，制定了推动方案并形成新的工作机制。今天，信息安全产品认证管理委员会的正式成立，标志着我国信息安全产品认证认可工作跨入了一个新的阶段。这一局面的取得，得益于国家质检总局、国家认监委的有利领导，得益于公安部、安全部、信息产业部、国家保密局、国家密码管理局等有关部门的大力支持和协同。在这里，我谨代表国务院信息化工作办公室向支持这一工作的各个部门表示衷心的感谢。     

山石网科通过国家信息安全产品认证

近日,在国家信息安全产品认证颁证大会上,山石网科SG-6000新一代安全网关喜获首批“中国国家信息安全产品认证证书”。此次颁证是中国信息安全强制认证的首次颁证,国家认证认可监督管理委员会主任孙大伟、工业和信息化部副部长杨学山等领导分别为国内14家安全企业的34款产品颁发认证证书。     

中国人民银行防火墙产品选型国家信息安全认证公告

中国信息安全产品测评认证中心受中国人民银行的委托,根据《人民银行防火墙产品安全测评技术规范》的要求,对中国人民银行选型入围的防火墙产品进行了测评。截止2002年6,下述厂商的19个产品已通过国家信息安全认证,并获得中国人民银行的认可。本中心已按国家有关规定予以注册,并颁发国家信息安全认证证书,现予公告:     

我国颁发首批国家信息安全产品认证证书

无论在任何一个国家,信息安全都已经成为直接涉及国家利益、安全和主权的关键产业。各国政府对信息安全产品以及信息系统安全性的测评认证,都要比对其他产品更为严格。在发达国家,对信息安全产品施行认证甚至在特定领域施行强制性认证也已经是普遍现象。在我国,信息安全产品认证是我国信息安全保障体系建设的一项基础性工作,     

中国开放系统互连产品质量认证管理委员会成立

1996年8月30日,在北京召开了中国开放系统互连认证管理委员会成立大会。同时举行了上海东方计算机网络认证中心(O-CC)和上海东方计算机网络测试实验室(O-CTL)两个机构的揭牌仪式。来自国家技术鉴督局、国家科委、上海市科委、电子部、邮电部、国防科工委、公安部、国家安全部、中国人民银行、中科院、中国计算机软件与服务公司、长江计算机集团公司、上海市技术监督局和复旦大学等单位的代表会聚一堂,举行了中国开放系统互连产品质量认证管理委员会及O-CC和O-CTL的成立大会。     

中国电磁兼容认证委员会成立

中国电磁兼容认证委员会已于日前正式成立并开展电磁兼容认证工作。中国电磁兼容认证委员会是国家质量技术监督局依法授权的代表国家对产品电磁兼容性进行第三方公正评价的认证机构,由管理委员会和认证中心组成。中国电磁兼容认证委员会的工作受国家质量技术监督局领导,并接受社会各方面的监督。管理委员会由有关政府主管、生产、使用、科研和质量监督等部门的代表和专家组成。管理委员会负责制定委员会的章程、认证管理办法以及与认证有关的重要工作文件,领导和监督认证中心的工作。中国电磁兼容认证中心是管理委员会领导下的认证实体,负责…     

国家强制性产品认证管理办法出台

2001年4月,国务院决定成立国家认证认可监督管理委员会,统一管理监督和综合协调全国的认证认可工作,按照市场经济体制要求建立起了新的认证认可管理模式,为按照WTO国民待遇原则开展产品认证,建立统一高效、内外一致的国家认证认可和合格评定制度提供了体制保障。对强制性产品认证实行统一目录、统一标准和合格评定程序、统一标志、统一收费的“四个统一”,是我国认证认可工作的一项重大改革,也是我国在入世谈判中就有关认证认可工作做出的庄严承诺。“四个统一”实施以后,将把国家对内、对外的两套认证认可管理体系完全统一起来,建立起全国统一、内外一致的认证认可及合格评定制度,真正兑现我国入世谈判中的有关承诺,体现世贸组织有关协议的国民待遇原则。我国的认证认可工作与国际规范接轨,有效保证了我国在入世后以更加积极的姿态,解决产品强制认证中统一目录、标准、法规和标志的问题,切实消除技术性贸易壁垒,进一步推动全方位、多层次、宽领域的对外开放。现在新的国家强制性产品认证管理办法及收费办法等已正式公布,并将于2002年5月1日起开始实施。与此同时,国家强制性产品认证标志将统一为新的“中国强制性认证”标志(3C标志)。为便于读者更好地理解和贯彻实施国家认监会的文件精神,本刊特将有关     

ITALSAT propagation experiment at 18.7, 39.6 and 49.5 GHz at SpinoD'Adda: three years of CPA statistics

The ITALSAT propagation experiment, started in early 1991, allows an extensive program of measurements at 18.7, 39.6, and 49.5 GHz. This paper reports the results obtained so far from copolar signal measurements carried out at the Earth station of Spine d'Adda from 1993 to 1995. Statistics of rain and total attenuation and frequency scaling of total attenuation are presented and commented on in the light of ITU-R predictions     

Admittance of a phase-locked Gunn oscillator at high input powers

A phase-locked Gunn oscillator can become passive at high input powers. The `reflection? coefficient, defined by r=?(Pout/Pin), can drop to zero. Experiments on this behaviour are compared with a simple theoretical calculation.     

Au薄膜溅射功率对ZnO/Au复合薄膜质量的影响

在ZnO薄膜上采用不同溅射功率制作了Au薄膜,研究不同溅射功率对Au膜成膜速率、结晶质量和结合力的影响,表明在本实验中100 W功率下Au膜的成膜质量比较好。同时对ZnO薄膜电阻的影响进行了研究,结果表明溅射功率越高,ZnO导通的可能性越大,通过实验,溅射工艺在100 W下制备的Au薄膜对ZnO电阻影响最小。     

Stability of nonlinear systems with three time scales

We study the asymptotic stability of a singularly perturbed nonlinear time-invariant systemS _v , which has three vastly different time scales. The systemS _v is approximated by three simpler systems over different time intervals. We give a straightforward proof of the fact that the asymptotic stability ofS _v is guaranteed when the equilibrium points of the three simpler systems are exponentially stable and when the parameters and are sufficiently small.Research sponsored by the Joint Services Electronics Program, Contract Number F4962084-C-0057, and NASA, Grant NAG2-243.     

Comparison of relative energies and powers

Many times, you can evaluate a statement or theory just looking to see if the energy and power involved are reasonable. In this article I have included some discussions of notorious, and inaccurate, comparisons. These are designed to show that mere comparisons of energy aren't necessarily significant and that a little qualitative analysis helps to separate the marketing hype from reasonable facts.     

Wavelet shrinkage: unification of basic thresholding functions and thresholds

This work addresses the unification of some basic functions and thresholds used in non-parametric estimation of signals by shrinkage in the wavelet domain. The soft and hard thresholding functions are presented as degenerate smooth sigmoid-based shrinkage functions. The shrinkage achieved by this new family of sigmoid-based functions is then shown to be equivalent to a regularization of wavelet coefficients associated with a class of penalty functions. Some sigmoid-based penalty functions are calculated, and their properties are discussed. The unification also concerns the universal and the minimax thresholds used to calibrate standard soft and hard thresholding functions: these thresholds pertain to a wide class of thresholds, called the detection thresholds. These thresholds depend on two parameters describing the sparsity degree for the wavelet representation of a signal. It is also shown that the non-degenerate sigmoid shrinkage adjusted with the new detection thresholds is as performant as the best up-to-date parametric and computationally expensive method. This justifies the relevance of sigmoid shrinkage for noise reduction in large databases or large size images.     

Vector space framework for unification of one- and multidimensionalfilter bank theory

A number of results in filter bank theory can be viewed using vector space notations. This simplifies the proofs of many important results. In this paper, we first introduce the framework of vector space, and then use this framework to derive some known and some new filter bank results as well. For example, the relation among the Hermitian image property, orthonormality, and the perfect reconstruction (PR) property is well-known for the case of one-dimensional (1-D) analysis/synthesis filter banks. We can prove the same result in a more general vector space setting. This vector space framework has the advantage that even the most general filter banks, namely, multidimensional nonuniform filter banks with rational decimation matrices, become a special case. Many results in 1-D filter bank theory are hence extended to the multidimensional case, with some algebraic manipulations of integer matrices. Some examples are: the equivalence of biorthonormality and the PR property, the interchangeability of analysis and synthesis filters, the connection between analysis/synthesis filter banks and synthesis/analysis transmultiplexers, etc. Furthermore, we obtain the subband convolution scheme by starting from the generalized Parseval's relation in vector space. Several theoretical results of wavelet transform can also be derived using this framework. In particular, we derive the wavelet convolution theorem     

Second-order accurate FDTD space and time grid refinement method in three space dimensions

We present an algorithm based on the finite-difference time-domain method for local refinement of a three-dimensional computational grid in space and time. The method has second-order accuracy in space and time as verified in the numerical examples. A number of test cases with material traverse normal to the grid interfaces were used to assess the long integration time stability of the algorithm. Resulting improvements in the computation time are discussed for a photonic crystal microcavity design that exhibits a sensitive dependence of the quality factor on subwavelength geometrical features.     

The unification of differential encoding and decoding algorithm for various signals

Many monographs point out that differential encoding and decoding is necessary for ef- fectual information transmission against phase ambiguity while seldom discuss the reason why phase ambiguity will emerge inevitably.Available algorithms are specially designed for certain modulation scheme;these algorithms cannot satisfy the requirement of soft-defined radio,which perhaps demands a uniform algorithm for different modulations.This paper proposes a new opinion on phase ambiguity from the view of probability.This opinion believes that modulating symbol sequence can affect,at optimum sampling epoch,the modulated waveform as oscillating carrier has done,and so the stochastic sequence leads to phase ambiguity.Based on a general signal model,this paper also puts forward a novel universal algorithm,which is suitable for different signals,even some new ones,by configuring several parameters.