An Algebraic Technique for Reliability Evaluation

An algebraic technique is proposed to obtain a simplified reliability expression of a general system. A success expression which directly gives the reliability expression, is formed and simplified by the procedure. The technique is equally efficient for simple and complex systems; yields computationally efficient reliability expressions; is routine (no decision making); yields an expression having a minimum number of product terms; and is easier than many existing techniques.     

通信网络系统可靠性评测技术研究

通过指出现有通信网络系统可靠性评测技术的不足,有针对性地提出解决的思路和方法,并介绍了改进方法的步骤,同时探讨了网络抗毁性的问题。     

Attenuation Correction for SPECT: An Evaluation of Hybrid Approaches

Most methods that have been proposed for attenuation compensation in single-photon emission computed tomography (SPECT) either rely on simplifying assumptions, or use slow iteration to achieve accuracy. Recently, hybrid methods which combine iteration with simple multiplicative correction have been proposed by Chang and by Moore et al. In this study we evaluated these methods using both simulated and real phantom data from a rotating gamma camera. Of special concern were the effects of assuming constant attenuation distributions for correction and of using only 180 degrees of projection data in the reconstructions. Results were compared by means of image contrast, %RMS error, and a chi-square error statistic. Simulations showed the hybrid methods to converge after 1-2 iterations when 360 degrees data were used, less rapidly for 180 degrees data. The Moore method was more accurate than our modified Chang method for 180 degrees data. Phantom data indicated the importance of using an accurate attenuation map for both methods. The speed of convergence of the hybrid algorithms compared to traditional iterative techniques, and their accuracy in reconstructing photon activity, even with 180 degrees data, makes them attractive for use in quantitative analysis of SPECT reconstructions.     

车载扬声器的环境可靠性测试技术探讨

扬声器是汽车必不可少的组成部分,人们对乘车和驾驶的舒适感的要求不断提高,为满足人类对舒适、可靠等方面的要求,车载扬声器的可靠性显得尤为重要。该文基于一流汽车厂商的标准介绍了主流的车载扬声器的测试方法并根据不同环境条件下可能出现的不同应力进行分析,列举了一些可靠性测试技术,对企业在车载研发阶段的设计和验证有一定的帮助。     

VLSI金属化互连可靠性的快速评价技术

深入探讨了标准晶片级电迁移加速试验方法 ( SWEAT试验方法 )的试验原理、试验系统的建立、试验步骤及试验结果的分析等 ,并将在实践中总结出的试验经验和技巧介绍给大家。同时将该方法应用到生产实际 ,为工艺可靠性监测、研究电迁移失效机理与关键工艺的相关关系提供了有效手段。     

Quadrilateral-Star Transformation: An Aid for Reliability Evaluation of Large Complex Systems

Although delta and star transformations are usually adequate for reliability evaluation, they can fail for some complex networks. Under these conditions the quadrilateral-star transformation introduced in this paper can be used with success. The quadrilateral-star transformation is not exact; however, it yields results having adequate accuracy.     

一种经济准确的电子装备可靠性评估方法

给出了一种低成本、高准确性的电子装备可靠性评估方法。该方法利用日常工作中积累的电子装备调试、生产、试验和使用过程中的有效可靠性数据,采用合适的可靠性评估数学模型,计算出较准确的电子装备可靠性评估值。收集足够有效的可靠性数据及选择合适的评估模型,是该估计方法的关键。将可靠性验证与装备日常试制、试验工作相结合的可靠性评估方法,属国内首创;同时,该方法适用性强、准确度高而且成本低,具有普遍推广的意义。     

Correction to: An Enhanced Crow Search Inspired Feature Selection Technique for Intrusion Detection Based Wireless Network System

Wireless Personal Communications -     

An Algorithm for the Reliability Evaluation of Redundant Networks

An algorithm is presented for evaluation of reliability of any redundant network. It uses the properties of digraphs and is especially suitable for the computer analysis of large complex networks. A method for deriving the reliability expression for any type of network is also described along with a Fortran computer program for the reliability evaluation of series-parallel networks.     

An Efficient Method for Reliability Evaluation of a General Network

This paper presents a method for finding the terminal-pair reliability expression of a general network. First, the system success function S is found, beginning from the connection matrix for the logic diagram of the network. Second, using the concept of Exclusive operator, S is changed to its equivalent S (disjoint) form, and the reliability expression has been derived. The method has the advantage of not requiring step by step testing for disjointness. Examples illustrate the method.     

复杂流场的代数迭代重建算法

提出了简单自相关代数迭代重建算法（SSART）。采用数值模拟的方法,对当前有代表性的基本代数迭代法（ART）、联合代数迭代法（SART）、改进的联合代数迭代法（MSART）以及SSART进行了计算模拟,对比分析了各种算法的模拟效果和重建精度。结果发现,SSART的均方误差（MSE）在10^-4数量级,比ART的降低了78．2％;峰值相对误差（PE）在10^-2,降低了92．9％;计算程序上,SSART仅比ART多1个除数因子。所以SSART具有算法简单、重建精度高、稳定性好和自愈能力强等优点。     

Detection?Correction Decoding for System Reliability

Error-correcting codes can be used in digital communication and storage for error control. A two-step decoding procedure is proposed for improving system performance when error correction is used. When applicable it should reduce the average decoding time or logic required for realization. Possible applications to faulty memory arrays and unit-to-unit data transmission are given.     

Improving Energy Efficiency and Reliability in WuR-Based IoT Systems: An Error Correction Approach

Wireless Personal Communications - One of the most suitable option for millimeter-wave integrated circuits and systems implementation is Substrate Integrated Waveguide (SIW) Technology....     

红外焦平面阵列非均匀性实时校正技术研究

在分析红外焦平面阵列非均匀性噪声产生机理的基础上,提出了一种易于硬件实现的新算法,并给出了其硬件实现。该算法从数字图像处理的角度出发,通过垂直滤波和排序均值滤波,对非均匀性进行校正。利用该算法能实时有效地消除红外图像的非均匀性噪声,增强图像的视觉质量。     

有效的可靠性增长管理技术

可靠性增长是提高航空电子设备可靠性的重要途径 ,已为军方和工厂企业所重视。有效的可靠性增长是通过强有力的可靠性增长管理才能实现的。通过机载导航产品可靠性增长实践 ,论述了有效的可靠性增长管理技术 ,包括 :增长目标值、组织保证体系、管理策略、TAAF和FRACAS等等     

A New Technique to Optimize System Reliability

This paper describes an algorithm for solving reliability optimization problems formulated as nonlinear binary programming problems with multiple-choice constraints. These constraints stand for restrictions in which only one variable is assigned to each subset making up the set; thus, they are expressed by equations whose r.h.s. is unity. Different types of methods for achieving high reliability (an increase in component reliability, parallel redundancy, standby redundancy, etc.) can be easily used simultaneously as design alternatives for each subsystem. In order to solve the problem effectively, the Lawler & Bell algorithm is improved by introducing a new lexicographic enumeration order which always satisfies the multiple-choice constraints. The function for obtaining feasible solutions which give first ~ L-th minimum values of the objective function is added to the algorithm in order to make it more useful for decision making. After a numerical example assists in understanding the algorithm, the computational efficiency is compared with that of the Lawler & Bell algorithm.     

An Algebraic Approach to Formal Verification of Microprocessors

In this letter we report the formal verification of microprocessors. After we describe algebraically a bit-sliced microprocessor at both function and logic levels, we apply the symbolic manipulation of Mathematica.     

A Modified Technique for Computing Network Reliability

Ahmad (1982) has published a technique to compute the reliability of a network without resorting to paths or cutsets. However, the technique uses a random choice of next node connected to the previous node in the construction of a tree. This approach can lead to a large number of terms in the reliability expression. Our modified version of the Ahmad technique always produces a reliability expression with the same or fewer terms as the original technique.