Approximate bayes estimation for mixtures of two weibull distributions under type-2 censoring

The main object of this paper is the approximate Bayes estimation of the five dimensional vector of parameters and the reliability function of a mixture of two Weibull distributions under Type-2 censoring. Under Type-2 censoring, the posterior distribution is complicated, and the integrals involved cannot be obtained in a simple closed form. In this work, Lindley's (1980) approximate form of Bayes estimation is used in the case of a mixture of two Weibull distributions under Type-2 censoring. Through Monte Carlo simulation, the root mean squared errors (RMSE's) of the Bayes estimates are computed and compared with the corresponding estimated RMSE's of the maximum likelihood estimates.     

Estimation of P(Y < X) for Weibull Distribution Under Progressive Type-II Censoring

Based on progressively Type II censored samples, we consider the estimation of R = P(Y < X) when X and Y are two independent Weibull distributions with different shape parameters, but having the same scale parameter. The maximum likelihood estimator, approximate maximum likelihood estimator, and Bayes estimator of R are obtained. Based on the asymptotic distribution of R, the confidence interval of R are obtained. Two bootstrap confidence intervals are also proposed. Analysis of a real data set is given for illustrative purposes. Monte Carlo simulations are also performed to compare the different proposed methods.     

强电环境下电子设备的抗干扰问题

通过强电环境下干扰类型与干扰源的分析，指出相应的抗干扰措施及抗干扰的发展方向。     

微弱荧光信号检测放大器的低噪声设计

本文对采用光电二极管的荧光信号接收电路的工作模式和噪声进行了分析。并论述了输入失调和暗电流的补偿方法,深入讨论了反馈电阻RF及补偿电容CF的防泄漏措施、输入管脚的“护卫(guarding)”与隔离技术、输入管脚的悬置引出技术、PCB板的清洁和隔离涂敷、屏蔽和滤波等技术。使所设计的接收电路获得较高的信噪比(SNR)。     

Dynamic Supply Risk Management with Signal‐Based Forecast,Multi‐Sourcing,and Discretionary Selling

We examine the critical role of advance supply signals—such as suppliers’ financial health and production viability—in dynamic supply risk management. The firm operates an inventory system with multiple demand classes and multiple suppliers. The sales are discretionary and the suppliers are susceptible to both systematic and operational risks. We develop a hierarchical Markov model that captures the essential features of advance supply signals, and integrate it with procurement and selling decisions. We characterize the optimal procurement and selling policy, and the strategic relationship between signal‐based forecast, multi‐sourcing, and discretionary selling. We show that higher demand heterogeneity may reduce the value of discretionary selling, and that the mean value‐based forecast may outperform the stationary distribution‐based forecast. This work advances our understanding on when and how to use advance supply signals in dynamic risk management. Future supply risk erodes profitability but enhances the marginal value of current inventory. A signal of future supply shortage raises both base stock and demand rationing levels, thereby boosting the current production and tightening the current sales. Signal‐based dynamic forecast effectively guides the firm's procurement and selling decisions. Its value critically depends on supply volatility and scarcity. Ignoring advance supply signals can result in misleading recommendations and severe losses. Signal‐based dynamic supply forecast should be used when: (a) supply uncertainty is substantial, (b) supply‐demand ratio is moderate, (c) forecast precision is high, and (d) supplier heterogeneity is high.     

信号测不准原理的量子诠释

根据量子力学的测不准原理,采用力学量算符的方法得到了信号在时频分析时的测不准原理,并对该原理进行量子诠释,认为信号在某种意义下可以看作是一个存在波粒二重性的类量子系统,正是由于信号的波粒二重性导致无法同时准确地测定信号的时间和频率。在证明信号测不准原理的同时得到了信号的频率算符,该算符具有广阔的理论应用前景。信号的量子诠释在揭示信号量子本质的同时,为量子力学中的理论框架应用于信号处理提供了理论支持。     

机械故障自动监测系统的信号解调和设计

文章研究了机械故障自动监测系统的信号解调,介绍了相应监测系统的设计,讨论了从串行通信的角度进行数据传送的实现方法.     

"信号与系统"与"数字信号处理"课程内容的整合探讨

"数字信号处理"与"信号与系统"课程的内容出现了许多融合。如何处理这两个课程之间的关系,是一个重要的问题。文章从两门课程的相互关系、讲课学时的分配、实验安排等方面进行了阐述。     

心电信号实验研究系统设计

本文设计了一个心电信号实验研究系统,系统可以采集、模拟任意导联心电信号,并将结果存储到心电数据库供研究分析使用。采集模拟仪采集或模拟可以采集任意导联、正常、异常心电信号,并保存结果;心电数据库以采集模拟仪为工具,在完成一些心电处理实验的基础上,采集并存储各种参数的心电信号,提供第三方研究使用。采集模拟仪和心电数据库组成一个实用系统,为心电信号的研究分析和相关仪器的开发提供了一个优秀的实验研究平台。