智能显示终端QX32C_256在键盘管理系统中的应用

本文详细介绍了QX32C_256彩色LCD智能显示终端的主要功能和串行口通信中的指令格式,以及其在键盘管理系统中的应用。     

电网电压瞬变叠加干扰的检测方法研究

本文在考察电网电压瞬变叠加干扰的基础上,对其检测方法作了较为详尽的方法,着重描述了实用性较强的模糊检测法并给予了研究。笔者所实现的硬件及其实测结果证这了模拟检测法在实际应用中的可行性。由于这种方法具有较“浮动窗”触发算法的硬件实现简单,成本低廉及可行性好等显著特点,特别在多路检测中则更具有优越性,因而在国内具有较高的推广价值。     

当前大学生就业歧视的经济分析

当前大学生就业问题日益严重,用人单位的就业歧视行为,如学历歧视和院校歧视等也愈演愈烈。经济分析使我们了解到,由于劳动力市场信息不对称,从而导致用人单位将学历和文凭视为市场信号,因而用人单位的学历歧视和院校歧视行为并非盲目的非理性行为,而是符合“经济人”假设的理性行为。     

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.     

An Empirical,Nonparametric Simulator for Multivariate Random Variables with Differing Marginal Densities and Nonlinear Dependence with Hydroclimatic Applications

Multivariate simulations of a set of random variables are often needed for risk analysis. Given a historical data set, the goal is to develop simulations that reproduce the dependence structure in that data set so that the risk of potentially correlated factors can be evaluated. A nonparametric, copula‐based simulation approach is developed and exemplified. It can be applied to multiple variables or to spatial fields with arbitrary dependence structures and marginal densities. The nonparametric simulator uses logspline density estimation in the univariate setting, together with a sampling strategy to reproduce dependence across variables or spatial instances, through a nonparametric numerical approximation of the underlying copula function. The multivariate data vectors are assumed to be independent and identically distributed. A synthetic example is provided to illustrate the method, followed by an application to the risk of livestock losses in Mongolia.     

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)。     

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.