基于Web的教学质量评价系统的设计与实现

为解决高校教师教学质量评价的网络化问题,在综合考虑数字化校园建设要求基础上,提出了基于Web的高校教师教学质量评价系统的功能要求和体系结构,设计了后台数据库系统和功能模块,保证了系统的实用性、兼容性和可扩展性.研究了面向数字化校园综合管理平台的公共数据采集技术和系统安全设计,有效地解决了教师教学质量评价系统与其它业务系统之间的融合问题和系统安全问题.测试结果表明了系统的有效性.     

LED调光控制技术在飞机导光板照明中的应用

描述了LED技术在飞机驾驶舱照明控制系统中的应用情况,针对目前民用飞机驾驶舱导光板照明普遍采用的LED电压调光技术和单纯PWM调光技术的不足,提出了改进的LED调光技术方案。新型方案利用组合调光技术和数字调光技术,弥补了传统LED调光技术的不足,并对不同的LED调光控制方案进行了分析,最后提出了LED调光技术的发展方向。     

一种新型光电轴角编码器译码方法研究

针对光电轴角编码器的光电流信号变化对传统译码电路结果有很大影响的问题,提出了一种新型译码方法及其硬件电路实现。该方法采用全数字方案获取编码器的原始信息,自适应地改变译码算法所需的关键参数,对环境变化等因素进行补偿。为了获得最佳的滤波效果,使滤波器参数随转速改变,对粗码信号进行智能滤波处理。在空间激光链路的高精度编码器应用中,此方法大大减少了译码电路调试和光电编码器机械装调的工作量,降低了由各种环境变化和干扰造成的误码率。     

工业及通讯领域微分方程组在线求解器的设计

针对工业现场控制以及仿真研究中普遍存在的微分方程组在线求解这一难题,从微分方程的反函数出发,结合工控软件运行特点,设计出有效的求解模型。在组态软件PineCAD上实现模型的搭建,实验证明可靠性与准确性。该求解器适用于对实时性要求较高的各类环境,具有简便高效的特点。     

基于高效信道化的侦察接收机设计与实现

为了解决电子侦察接收机中同时到达信号的接收问题,从传统的低通滤波器结构出发,给出了一种无盲区高效数字信道化接收模型。信道化之后进行瞬时幅度和相位差提取。通过系统仿真,验证了该信道化模型的正确性;通过搭建信道化接收机的硬件平台并对实际系统测试,验证了瞬时幅度及相位差测试的正确性。     

纯滞后环对数字电源环路影响的研究

研究了滞后环对数字电源的影响和滞后环的等效简化模型,给出了基于Matlab数字电源补偿器的设计步骤。仿真和实验表明,通过该方法设计的数字电源环路稳定性得到了有效保证。     

新型伺服控制系统的建模仿真与分析

分析了伺服控制系统的工作原理,提出一种新型伺服控制系统建模方法。在Matlab/Simulink环境下采用模块化的方法构建了系统的仿真模型,系统采用双闭环控制,并对该模型进行了仿真。仿真结果表明,该系统具有良好的动态和静态特性,验证了该方法的有效性,为实际伺服控制系统的设计和调速提供了新的方法。     

Truck scheduling at zero-inventory cross docking terminals

Handling freight at cross docking terminals constitutes a complex planning task which comprises several executive steps as shipments delivered by inbound trucks are to be unloaded, sorted according to their designated destinations, moved across the dock and finally loaded onto outbound trucks for an immediate delivery elsewhere in the distribution system. To enable an efficient synchronization of inbound and outbound flows, a careful planning of operations, e.g. by computerized scheduling procedures, becomes indispensable. This work treats a special truck scheduling problem arising in the (zero-inventory) cross docks of the food industry, where strict cooling requirements forbid an intermediate storage inside the terminal, so that all products are to be instantaneously loaded onto refrigerated outbound trucks. The problem is formalized such that different operational objectives, i.e. the flow time, processing time and tardiness of outbound trucks, are minimized. To solve the resulting truck scheduling problem suited exact and heuristic solution procedures are presented.     

OWA rough set model for forecasting the revenues growth rate of the electronic industry

Business operation performance is related to corporation profitability and directly affects the choices of investment in the stock market. This paper proposes a hybrid method, which combines the ordered weighted averaging (OWA) operator and rough set theory after an attribute selection procedure to deal with multi-attribute forecasting problems with respect to revenue growth rate of the electronic industry. In the attribute selection step, four most-important attributes within 12 attributes collected from related literature are determined via five attribute selection methods as the input of the following procedure of the proposed method. The OWA operator can adjust the weight of an attribute based on the situation of a decision-maker and aggregate different attribute values into a single aggregated value of each instance, and then the single aggregated values are utilized to generate classification rules by rough set for forecasting operation performance.To verify the proposed method, this research collects the financial data of 629 electronic firms for public companies listed in the TSE (Taiwan Stock Exchange) and OTC (Over-the-Counter) market in 2004 and 2005 to forecast the revenue growth rate. The results show that the proposed method outperforms the listing methods.     

基于Eisenstein环上圆锥曲线的数字签名

为了使曲线上的密码体制更加安全有效,引进Eisenstein环 ,介绍剩余类环 上的圆锥曲线 ,其中, 为 上满足 的2个不同的不可分数 的乘积。给出基于 的盲签名方案在圆锥曲线 上的模拟,并以电子支付系统中的可分电子现金为例讨论 上数字签名的应用,其安全性是基于大数分解和有限 群 上计算离散对数的困难性。圆锥曲线 上的数字签名方案体现了圆锥曲线所具有的明文嵌入方便、运算速度快、更易于实现等优点。