Nonparametric change detection and estimation in large-scale sensor networks

The problem of detecting changes in the distribution of alarmed sensors is considered. Under a nonparametric change detection framework, several detection and estimation algorithms are presented based on the Vapnik-Chervonenkis (VC) theory. Theoretical performance guarantees are obtained by providing error exponents for false-alarm and miss detection probabilities. Recursive algorithms for the efficient computation of test statistics are derived. The estimation problem is also considered in which, after detection is made, the location with maximum distribution change is estimated.     

OPNET环境下的PIM—SM组播路由协议仿真

IPv6组播技术作为下一代互联网的核心技术之一,相对于IPv4组播技术具有更大的优越性。文章首先对PIM-SM组播协议在IPv6上实现PIM-SM涉及的问题进行了论述,然后在OPNET网络仿真模型中实现了对IPv6和IPv4混合网络场景的配置,进行组播的仿真实验比较单播与组播网络的性能,系统地分析了PIM-SM协议在OPNET中的实现。     

基于健康档案的医疗系统PKI信任模型研究

随着医疗信息技术的高速发展,我国医疗信息化建设中的信息安全问题显得越来越重要。而基于电子健康档案的医疗系统中身份认证管理已成为解决医疗信息系统中的安全问题中关键的一环。文章以基于电子健康档案的医疗系统中身份认证机制为出发点,分析PKI中各种信任模型的特点,对现有的方式进行研究和分析,设计出符合适合区域医疗信息平台的PKI信任模型,从而使基于电子健康档案的医疗系统中的身份认证机制更为安全、高效。希望给后续研究这一课题的研究者提供参考。     

MPEG-2／4AAC音频编码模块的验证

先进音频编码（AdvancedAudioCoding,AAC）以其多声道、多采样率、高压缩比、音质好等特点被广泛使用。文中首先介绍了MPEG-2／4AAC音频编码技术;接着基于MPEG-2／4AAC音频编码原理,开发了时钟复位、寄存器配置和音频数据收发的BFM模型,搭建了音频编码模块的RTL级虚拟验证平台,同时归纳了验证项;最后基于此验证平台和验证项,对设计进行了全面的仿真验证。实践证明该验证方法效率高、收敛快、覆盖率高,取得了较好的效果,为后续的FPGA平台验证和芯片应用提供了有力的保证。     

Optimizing nonlinearity of piezoresistive pressure sensors by an asymmetric Wheatstone bridge

Microsystem Technologies - Since nonlinearity is critical to silicon piezoresistive pressure sensors, this paper combined theoretical analysis and simulation to study the effect of changing the...     

An improved algorithm for finding the median distributively

Given two processes, each having a total-ordered set ofn elements, we present a distributed algorithm for finding median of these 2n elements using no more than logn +O(logn) messages, but if the elements are distinct, only logn +O(1) messages will be required. The communication complexity of our algorithm is better than the previously known result which takes 2 logn messages.     

安全监控系统在火电厂煤仓的应用

介绍了安全监控系统在煤仓的应用情况,分析了该系统的作用、工作原理、组织构架、实现步骤、存在问题及解决方案等,实现对煤仓的自动监测预警.通过煤仓安全监控系统有效监视煤仓内部原煤输送状态及安全状态,确保煤仓安全,提高输煤系统的自动化水平.     

板料成形模拟后处理中的截面物理量的显示技术*

在自行开发的板料成形有限元后置处理系统FASTAMP_POST中,采用了动态获取截面物理量的算法,实现了截面物理量实时显示功能。该功能真实反映了网格物理量的大小及其变化趋势,具有原理简单、易实现、执行速度快的优点。     

Synthesis,characterization, and thermal properties of phosphorus‐containing,wholly aromatic thermotropic copolyesters

A series of phosphorus‐containing, wholly aromatic thermotropic copolyesters from acetylated 2‐(6‐oxide‐6H‐dibenz〈c,e〉〈1,2〉oxa phosphorin‐6‐yl)‐1,4‐dihydroxy phenylene, p‐acetoxybenzoic acid, terephthalic acid, and isophthalic acid were prepared by melting polycondensation. The structure and basic properties of the polymers, such as the glass‐transition temperature (T_g), melting temperature (T_m), thermal stability, crystallinity, and liquid crystallinity, were investigated with Fourier transform infrared, elemental analysis, differential scanning calorimetry (DSC), thermogravimetric analysis, wide‐angle X‐ray diffraction, and hot‐stage polarizing optical microscopy. The copolyesters had relatively high T_g values ranging from 183 to 192°C. The T_m values obtained from DSC curves for samples P‐20 and P‐25 were 290 and 287°C, respectively (where the number in the sample name indicates the molar fraction of the phosphorus‐containing monomer in the reactants). The initial flow temperatures of other samples observed with hot‐stage polarizing microscopy were 271–290°C. The 5% degradation temperatures in nitrogen ranged from 431 to 462°C, and the char yields at 640°C were 41–52%. All the copolyesters, except P‐40, were thermotropic and nematic. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1278–1284, 2002     

Interaction‐Feature Enhanced Multiuser Model Learning for a Home Environment Using Ambient Sensors

Activity recognition (AR) is a key enabler for a context‐aware smart home since knowing what the residents’ current activities helps a smart home provide more desirable services. This is why AR is often used in assistive technologies for cognitively impaired people to evaluate their abilities to undertake activities of daily living. In a real‐life scenario, multiple‐resident AR has been considered as a very challenging problem, primarily due to the complexity of data association. In addition, most prior research has not considered the potential interpersonal interactions among residents to simplify complexity, especially in an environment monitored by ambient sensors. In this study, we propose two types of multiuser activity models, both of which are derived from an interaction‐feature enhanced multiuser model learning framework. These two models consider interpersonal interactions and data association for multiuser AR using ambient sensors. We then compare their performance with the other two baseline models with or without consideration of data association and interpersonal interactions. The experimental results show that the derived models outperform other baseline classifiers. Therefore, the proposed approach can increase the opportunities for providing context‐aware services for a multiresident smart home.