使用遗传算法对时序电路进行可测性预报

随着LSI/VLSI技术的发展,许多新的测试生成算法被开发出来 对于一个给定电路,快速而准确地选择最适合它的测试生成算法是一个具有很强现实意义的问题.本文提出了使用遗传算法(GA)找出逻辑电路的特性参数与测试生成算法可测性参数之间的关系,从而建立测试生成算法可测性参数(故障覆盖率,测试码个数)的模型,并对给定电路进行参数预报的方法。作者开发了遗传算法预报系统(GAFS),并使用该系统为常用的测试生成算法建立了直观的可测性参数表达式模型.用户可通过计算直接求得各测试生成算法对电路的可测性参数,然后通过比较选出最佳的算法.预报结果显示该系统具有较强的有效性和实用性.

基于灵敏度的模拟电路测试参数分析

介绍了一种提取电路最佳可测性参数集以诊断电路故障的新方法。利用灵敏度法分析了电路中故障元件和可测性参数之间的关系,推导出由电路可测性参数表示的故障元件容差最大值和最小值的表示式,得到诊断故障元件的最佳可测性参数,最后利用数据优化算法得到电路故障诊断的最佳可测性参数集。利用所介绍方法分析了一个低通滤波器电路,得到诊断该电路故障的最佳参数集。由于只需较少的可测性参数即可完成电路的故障诊断,因此本方法不仅计算简单,而且可有效地缩短测试时间和降低测试成本。

测试生成算法评估与预报系统

测试生成算法评估与预报系统分别利用回归算法、神经网络算法和遗传算法为测试生成算法建立预报模型,使得对给定电路,不必 实际运行测试生成算法,就可快速地得到最有效的测试生成算法。对如何利用遗传算法建立预报模型进行了较为详细的论述。

Lifetime prediction for tantalum capacitors with multiple degradation measures and particle swarm optimization based grey model

A lifetime prediction method for high-reliability tantalum （Ta） capacitors was proposed, based on multiple degradation measures and grey model （GM）. For analyzing performance degradation data, a two-parameter model based on GM was developed. In order to improve the prediction accuracy of the two-parameter model, parameter selection based on particle swarm optimization （PSO） was used. Then, the new PSO-GM（1, 2, co） optimization model was constructed, which was validated experimentally by conducting an accelerated testing on the Ta capacitors. The experiments were conducted at three different stress levels of 85, 120, and 145℃. The results of two experiments were used in estimating the parameters. And the reliability of the Ta capacitors was estimated at the same stress conditions of the third experiment. The results indicate that the proposed method is valid and accurate.

The predictability of atmospheric and oceanic motions:Retrospect and prospects

This paper reviews the historic understanding of the predictability of atmospheric and oceanic motions, and interprets it in a general framework. On this basis, the existing challenges and unsolved problems in the study of the intrinsic predictability limit(IPL) of weather and climate events of different spatio-temporal scales are summarized. Emphasis is also placed on the structure of the initial error and model parameter errors as well as the associated targeting observation issue. Finally, the predictability of atmospheric and oceanic motion in the ensemble-probabilistic methods widely used in current operational forecasts are discussed.The necessity of considering IPLs in the framework of stochastic dynamic systems is also addressed.

Software reliability analysis considering correlated component failures with coupling measurement framework

With progression of the digital age, the complexity of software continues to grow. AS a result, methods to quantitatively assess characteristics of software have attracted significant atten- tion. These efforts have led to a large number of new measures such as coupling metrics, many of which seek to consider the impact of correlations between components and failures on ap- plication reliability. However, most of these approaches set the coupling parameters arbitrarily by making assumptions instead of utilizing experimental data and therefore may not accurately capture actual coupling between components of software applica- tion. Since the coupling matrix is often set arbitrarily, the existing approaches to assess software reliability considering component correlation fail to reflect the real degree of interaction and rela- tionships among software components. This paper presents an efficient approach to assess the software reliability considering Correlated component failures, incorporating software architec- ture while considering actual internal coupling of software with an efficient approach based on multivariate Bernoulli （MVB） distribu- tion. The unified framework for software Coupling measurement is＇ informed by a comprehensive survey of frameworks for object- oriented and procedure-oriented software. This framework enables the extraction of more accurate coupling among cornponents. The effectiveness of this method is illustrated through an exPerimental study bylapplying it to a real-time software application.

Reliability and validity of tongue color analysis in the prediction of symptom patterns in terms of East Asian Medicine

OBJECTIVE:To examine whether color parameters of tongue inspection(TI)using a digital camera was reliable and valid,and to examine which color parameters serve as predictors of symptom patterns in terms of East Asian medicine(EAM).METHODS:Two hundred female subjects'tongue substances were photographed by a mega-pixel digital camera.Together with the photographs,the subjects were asked to complete Yin deficiency,Phlegm pattern,and Cold-Heat pattern questionnaires.Using three sets of digital imaging software,each digital image was exposure-and white balance-corrected,and finally L*(luminance),a*(red-green balance),and b*(yellow-blue balance)values of the tongues werecalculated.To examine intra-and inter-rater reliabilities and criterion validity of the color analysis method,three raters were asked to calculate color parameters for 20 digital image samples.Finally,four hierarchical regression models were formed.RESULTS:Color parameters showed good or excellent reliability(0.627-0.887 for intra-class correlation coefficients)and significant criterion validity(0.523-0.718 for Spearman's correlation).In the hierarchical regression models,age was a significant predictor of Yin deficiency(β=0.192),and b*value of the tip of the tongue was a determinant predictor of Yin deficiency,Phlegm,and Heat patterns(β=-0.212,-0.172,and-0.163).Luminance(L*)was predictive of Yin deficiency(β=-0.172)and Cold(β=0.173)pattern.CONCLUSION:Our results suggest that color analysis of the tongue using the L*a*b*system is reliable and valid,and that color parameters partially serve as symptom pattern predictors in EAM practice.

Watermarking Data Cubes

We propose a robust watermarking scheme and several extensions for digital right management of data cubes.The ownership information is hidden into a data cube by modifying a set of selected cell values.Its owner can use his private key to control all the watermarking parameters freely.Neither original data cube nor the watermark is required in watermark detection.Detailed analysis and extensive experiments are conducted for the proposed schemes in terms of watermark detectability,robustness and efficiency.Our results show that the scheme performs well in actual applications.