供应链管理基础浅析

文章阐述了主要对电子商务中的供应链管理基础，并对其进行了分析。     

一种基于SIP的分布式多方会议系统的设计与实现

移动互联网的发展对多方会议的信令系统提出更高要求,分布式多方会议系统适合于面向组的各种协同应用,封闭型会议环境下的此类应用尤为复杂。文章基于扩展SIP协议,设计和实现了一种适合于封闭型环境的分布式多方会议信令系统,并验证其良好的性能。     

基于ANSYS的电子组件有限元热模拟技术

随着电子组件集成化程度越来越高，单位何种内的热耗散程度越来越高，导致发热量和温度急剧上升，由于热驱动引起的机械，化学、电气等可靠性问题越来越严重，严重影响了产品的质量和可靠性，本文以大功率电子组件DC/DC电源变换器为例，提出了基于通用的大型有限元分析软件ANSYS进行热模拟分析方法，并利用实验结果对模拟结果进行了验证。     

环境试验设备的(PDM)与(ERP)数据转换软件的实现

本文介绍了环境试验设备的产品数据管理系统（PDM）与企业资源管理软件（ERP）间数据转换软件的实现方法。     

阐释Sigma与机器性能的关系

生产设备的Sigma或Cpk等级非常重要,但其背后的理论很易会引起混淆.统计工艺控制(SPC)工具可以算出答案,但是假如设备一直达不到制造商声称的性能,那又如何?一些设备供应商甚至对于机器什么时候能达到最理想的重复精度6-Sigma的意见也不一致,当中的不稳定性主要来自如何诠释数据及如何运用适当的变数上限和下限.其实关键在于工艺的标准偏差,这是大家都同意的一点.     

下一代显示接口新标准--DisplayPort

随着显示技术逐渐转移到高性能的平板以及微电子技术,业界需要一种可扩充、开放产业标准的数字接口,以及可以把功能升级的解决方案。这种可升级的显示接口,应能满足企业以及一般消费者的各种需求。DisplayPort就是这种下一代的显示接口,可以为PC、监视器、显示面板、投影仪、以     

Level Set Hyperspectral Image Classification Using Best Band Analysis

We present a supervised hyperspectral classification procedure consisting of an initial distance-based segmentation method that uses best band analysis (BBA), followed by a level set enhancement that forces localized region homogeneity. The proposed method is tested on two hyperspectral images of an urban and rural nature. The proposed method is compared to the maximum likelihood (ML) method using BBA. Quantitative results are compared using segmentation and classification accuracies. Results show that both the initial classification using BBA features and the level set enhancement produced high-quality ground cover maps and outperformed the ML method, as well as previous studies by the authors. For example, with the compact airborne spectrographic imager image, the ML method resulted in accuracies les95.5%, whereas the level set segmentation approach resulted in accuracies as high as 99.7%.     

Modeling of spiking analog neural circuits using organic semiconductor thin film transistors with silicon oxide nitride semiconductor gates

This paper uses the results of the characterization of amorphous semiconductor thin film transistors (TFTs) with the quasi-permanent memory structure referred to as silicon oxide nitride semiconductor (SONOS) gates, to model spiking neural circuits. SONOS gates were fabricated and characterized. In addition, MOSFETs using organic copper phthalocyanine (CuPc) were fabricated with these SONOS gates to demonstrate proof of concept performance. Analog spiking circuits were then modeled using these low performance TFTs to demonstrate the general suitability of organic TFTs in neural circuits. The basic circuit utilizes a standard comparator with charge and discharge circuits. A simple Hebbian learning circuit was added to charge and discharge the SONOS device. The use of these elements allows for the design and fabrication of high-density 3-dimensional circuits that can achieve the interconnect density of biological neural systems.     

从初装费的变化看我国通信网发展的不同阶段

本文介绍我国电话初装费在电话网不同发展阶段的情况。文章认为,我国在解放后很长一段时间内,由于实行低初装费政策,导致企业投资过低,电信网发展缓慢。１９７９年提高初装费标准后,保证了电话网建设的１／３的资源来源。１９７９年提高初装费标准后,保证了电话网建设约／３的资金来源。从现在起,我国将逐渐下调初装费,这将进一步促进电信市场的发展,另一方面,电信网建设的融资方式也将进一步市场化。