基于中国市场儿童玩具设计研究

调研了当今中国儿童玩具现状,通过分析潜在的问题与国外玩具的对比,旨在找出设计中的问题,并在原有的基础上明确改进方向。为了提高本国特色的玩具产品,各年龄阶段儿童玩具设计应共同注重安全性、民族化、系列化和交互式,使中国玩具在国际市场上有更大的竞争力。     

一种基于核密度估计的模拟电路故障诊断方法

为解决模拟电路中含有噪声等异常信息给支持向量机的最优分类面建立带来的困难,提出了一种基于核密度估计方法的模拟电路故障诊断新方法。首先提取电路的时域信号统计参数作为故障特征,然后运用核密度估计方法构造模糊隶属度函数,将该隶属度函数应用到模糊支持向量机上进行故障诊断。通过训练模糊支持向量机获得故障诊断模型,实现对电路单故障和多故障的诊断分类,能有效消除特征中噪声和野点的影响。将该方法应用于CSTV滤波电路进行仿真实验,结果表明该方法能突出不同故障的特性并正确有效地诊断出多故障类型,综合诊断正确率达到95%,为模拟电路故障诊断提供了新的技术途径。     

差压测漏仪微泄漏的建模与仿真

为研究密封件的微泄漏量大小与检测时间之间的关系,实现检测时间与检测可靠性的优化,通过分析密封件微小泄漏的理论,建立了微小泄漏的等效模型。基于此模型,采用AMESim仿真软件对差压测漏仪检测微小泄漏的动态特征进行仿真分析,得出了被测件微小泄漏时的动态P-T关系曲线。结果表明,此仿真试验能反映出密封件微泄漏时压力与时间的动态关系,为制定最优的检测时间提供了依据。     

面向Kad网络的eMule文件下载控制方法

结合关键词污染和Kad索引污染技术,设计一种面向Kad网络的eMule文件下载控制方法。从Web服务器获取eMule文件的 ED2K链接,解析链接得到文件属性信息,通过构造虚假文件属性信息污染Kad网络的关键词字典和文件索引字典,从而控制eMule文件在Kad网络中的传播。实验结果表明,该方法可以延缓eMule节点之间的连接时间,达到eMule文件下载控制的目的。     

Trends in youth’s videogame playing, overall computer use, and communication technology use: The impact of self-esteem and the Big Five personality factors

The objective of the current research is to model trends in video game playing, overall computer use, and communication technology use in a longitudinal sample of youths, aged 11-16 over a 3-year interval. In addition, individual difference characteristics that may be predictive of these trends were included, namely, socio-demographic characteristics (gender, ethnicity, and parental income) and personality characteristics (self-esteem, the Big Five personality factors). Findings suggested that youth increased their overall computer and communication technology use but decreased their videogame playing over time. Many individual differences predicted mean levels of these technologies with fewer predicting slopes. Conclusions, implications, and limitations are discussed.     

α-MoO3/TiO2 core/shell nanorods: Controlled-synthesis and low-temperature gas sensing properties

Crystalline α-MoO₃/TiO₂ core/shell nanorods are fabricated by a hydrothermal method and subsequent annealing processes under H₂/Ar flow and in the ambient atmosphere. The shell layer is composed of crystalline TiO₂ particles with a diameter of 2-6 nm, and its thickness can be easily controlled in the range of 15-45 nm. The core/shell nanorods show enhanced sensing properties to ethanol vapor compared to bare α-MoO₃ nanorods. The sensing mechanism is different from that of other one-dimensional metal oxide core/shell nanostructures due to very weak response of TiO₂ nanoparticles to ethanol. The enhanced sensing properties can be explained by the change of type II heterojunction barrier formed at the interface between α-MoO₃ and TiO₂ in the different gas atmosphere. The present results demonstrate a novel sensing mechanism available for gas sensors with high performance.     

Effect of micro-electrode geometry on NO2 gas-sensing characteristics of one-dimensional tin dioxide nanostructure microsensors

Electrodes with micro-gaps are fabricated by using dc-sputtering and FIB techniques. SnO₂ nanowires are deposited on the micro-gap (1-30 μm) by suspension dropping method to fabricate a micro-gas sensor. The sensing ability of various SnO₂ micro-gap sensors is measured. A comparison between sensors reveals that the short-gap electrode has numerous advantages in terms of reliability, high sensitivity and detection of low concentrations of NO₂, while the large-gap electrode is relatively sensitive for high concentrations. Conductance measurements are carried out at different surface temperatures and NO₂ concentrations in order to investigate the effects that the gap size has on the overall sensor conductance. The results suggest that the interface between the electrode and sensitive layer has a very important role for the sensing mechanism of tin dioxide gas sensors.     

基于数据流的启发式文件传输识别系统设计

为了防止文件通过网络泄露,研究了网络传输文件的格式、传送形式以及通信行为特征,提出一种基于网络数据流的文件传输识别方法。通过引入文件数据流的概念,构建了具有特异性的文件特征指纹库,采用自适应深度协议分析技术,对文件传输在通信协议中表现出的内容和行为特征信息进行多层次启发式的检测。测试结果表明,该系统运行高效,检测结果准确。     

Interface feature prioritization for web services: Case of online flight reservations

Acceptance, utility, and usability of system designs have become a focal interest in human–computer interaction (HCI) research, yet at present there is a lack detailed understandings of which system design features influence them. The purpose of the study is to examine the effects of five product design features; customization, adaptive behavior, memory load, content density, and speed on user preference through an experimental study by using conjoint analysis. In experimental study, instead of classical conjoint cards, prototypes were generated for products. Besides, desirability and market segments of product prototypes were identified. In line with the results, among the five product design features, speed is the most and customization is the least important features that affect user preference. Contrary to the expectations, customization has a relatively small importance value in this research. Subsequent design features that influence user preference after speed are minimal memory load, adaptive behavior, and content density, respectively. According to findings, interfaces that have high-speed, minimal memory load, adaptive behavior, low content density, and customization features are more preferable than those that do not.