基于专家系统的建筑自动化系统故障诊断

针对建筑自动化系统(BAS)故障诊断日趋困难的问题,将专家系统与故障树分析法相结合,提出一种基于专家系统的BAS故障诊断方法。采用框架和规则相结合的知识表示法,建立相应的知识库。设计基于“框架规则+不确定性推理”的推理模式,给出专家诊断系统的实现方法。实验结果表明,该系统能提高推理结果的可用性。     

基于人工蜂群算法的群体动画路径生成方法

大多数群体智能算法容易陷入局部最优,且收敛速度较慢。为此,将粒子群优化算法引入人工蜂群算法中,提出一种改进的路径生成算法NewABC,实现最优目标位置的选取及粒子个体的路径规划。将该方法生成的路径数据导入maya三维动画制作软件中进行仿真实验,结果表明,该方法生成的群体动画效果逼真,动画创作效率有较大的提高。     

A label-free amperometric immunosensor based on horseradish peroxidase functionalized carbon nanotubes and bilayer gold nanoparticles

In this work, a novel label-free amperometric immunosensor has been constructed for detecting α-1-fetoprotein (AFP) based on nanocomposite of horseradish peroxidase (HRP) labeled carbon nanotubes (CNTs). First, the gold nanoparticles (AuNPs) were electrodeposited on the surface of the glass carbon electrode by electrochemical reduction of gold chloride tetrahydrate (HAuCl₄) to immobilize horseradish peroxidase labeled carbon nanotubes (HRP-CNTs). Then HRP-CNTs bioconjugate was immobilized on the surface of the electrodeposited AuNPs layer by the combination of forces (coordination and electrostatic force). Subsequently, it was immersed into gold colloidal nanoparticles (GNPs) solution, which was used to immobilize antibody biomolecules (anti-AFP). Enhanced sensitivity was obtained by using bioconjugates featuring HRP labeled (HRP-CNTs), which had lager specific surface area and good electronic catalysis (current response signal) compared to carbon nanotubes. Under optimized conditions, the linear ranges were from 0.2 to 200 ng mL⁻¹ with a detection limit of 0.067 ng mL⁻¹ (at an S/N of 3). The proposed immunosenor showed good precision, acceptable stability and reproducibility and could be used for the detection AFP in normal human serum, which provided a potential alternative tool for the detection of protein in clinical diagnosis.     

基于LabWindows/CVI和RTX的高速凸轮测试系统设计

为了研究凸轮机构在高速运转时出现的动力学问题,以LabWindows/CVI虚拟仪器开发工具和RTX实时系统为平台,设计了一个高速凸轮测试系统.该系统以工控机和数据采集卡为主要硬件,使用RTX实时系统采集数据,采样周期达到0.1 ms,利用LabWindows/CVI开发的虚拟仪器对数据进行分析处理、显示及存储.通过对...     

基于NTP的高精度时钟同步系统实现

Windows操作系统内置的NTP授时精度不高,分辨率最高只有10ms。给出一个基于Windows操作系统的计算机网络同步时钟实现方案,该方案可以有效提高计算机时钟同步精度,在LAN中时钟同步精度达250μs。同时采用了校正时钟频率误差算法,校正后的时钟长期计时误差能达到10天少于1s。     

54Mb/s NRZ时钟数据恢复电路的设计与实现

提出一种采用双环路的时钟数据恢复电路,电路采用改进型Hogge鉴相器;鉴相环电荷泵充放电电流为13.06μA,改善了输出时钟的抖动影响;压控振荡器采用四级环型振荡结构,由伪差分结构延迟单元组成,降低了系统电路设计难度,减小了VCO的增益。通过Cadence软件的Spectre工具仿真,能够顺利地从54Mb/s的非归零码数据中提取出54MHz的同步时钟,时钟占空比为50%,满足设计要求。     

Matrix games with interval data

The conventional game theory is concerned with how rational individuals make decisions when they are faced with known payoffs. In the real world, sometimes the payoffs are not known and have to be estimated, and sometimes the payoffs are only approximately known. This paper develops a solution method for the two-person zero-sum game where the payoffs are imprecise and are represented by interval data. Since the payoffs are imprecise, the value of the game should be imprecise as well. A pair of two-level mathematical programs is formulated to obtain the upper bound and lower bound of the value of the game. Based on the duality theorem and by applying a variable substitution technique, the pair of two-level mathematical programs is transformed to a pair of ordinary one-level linear programs. Solving the pair of linear programs produces the interval of the value of the game. It is shown that the two players in the game have the same upper bound and lower bound for the value of the imprecise game. An example illustrates the whole idea and sheds some light on imprecise game.     

A property-based attestation protocol for TCM

This paper presents a property attestation protocol for the security chip TCM (trusted cryptographic module) via analyzing the problems of the current property attestation, which is built on the property attestation model with the online trust third party. In the protocol the prover utilizes the zero-knowledge proof by the attribute certificates, configuration commitment and TCM signature, and attests its configuration and status which are compliant with the declarative security property. The protocol is ch...