Generalised nearest feature line for subspace learning

Nearest feature line (NFL) is a powerful tool in pattern recognition, which generalises the representational capacity of available prototypes by using linear interpolation and extrapolation between the feature points. NFL is generalised to subspace learning so that the obtained subspace has desirable discriminating ability. Experiments on face recognition demonstrate its effectiveness.     

番茄黄瓜菜汁豆腐加工工艺

以番茄汁、黄瓜汁和大豆为原料研制了色泽美观的天然、营养豆腐,丰富了豆腐的品种,有良好的发展前景。     

饲料混合误差分析方法

简介混合技术发展研究现状,提出了饲料混合机混合误差的概念,给出了混合误差的来源与置信区间,并推导出可用于评估饲料混合均匀度测量误差的计算式。     

基于综合仿真技术解决电力系统业务质量评价的方法

在实际工作中,业务系统运行质量及管理质量与网络质量的好坏密不可分,网络建设过程中对网络规模、建设需求与网络安全可靠性、资源使用情况等方面有着不同程度的要求,网络的升级改造、日常维护以及调度管理均对网络的质量有相应的评价标准和考核要求,为了提升电力运营管理、实现可靠性管理,需要结合相应业务管理指标需求,运用电力通信运行管理业务质量及应用模式仿真模型,对运行质量评价目标、动态风险评估管理、网络中故障和缺陷计分等进行业务质量评价.采用基于综合仿真技术解决业务质量评价的方法,实现业务质量评价管理及考核的结果验证,对于提升业务系统管理有重要的作用.     

利用PtOEP掺杂改善Spiro发光器件的发光效率

为了利用有机三线态发光提高有机发光器件的发光效率,用磷光材料掺杂到聚合物主体中作为发光层,制备有机电致发光器件.在测量器件的电流-电压特性、发光亮度-电压特性和电致发光谱的基础上,计算了器件的外量子效率,研究了磷光材料的掺杂浓度对器件发光效率的影响.结果表明,对特定的材料体系,适当控制掺杂浓度,可以同时观察到荧光和磷光光谱,使掺杂器件的外量子效率在纯聚合物发光器件的基础上得到明显提高.     

iPTT: peer‐to‐peer push‐to‐talk for VoIP

This paper proposes iPTT, a peer‐to‐peer (P2P) Push‐to‐Talk (PTT) service for Voice over IP (VoIP). In iPTT, a distributed and mobile‐operator independent network architecture is presented to accelerate the deployment of the PTT service. Based on the serverless architecture, we develop two mechanisms, that is, flooding‐based floor control mechanism (FFC) and tree‐based floor control mechanism (TFC), for real‐time talk‐burst determination. The determination algorithms and the corresponding message flows for these two mechanisms are designed to show the feasibility of FFC and TFC. The performance of FFC and TFC is investigated through our analytical and simulation models in terms of the determination latency and the number of floor‐control message exchanges. Copyright © 2008 John Wiley & Sons, Ltd.     

用SystemView产生超宽带脉冲信号

本文介绍了超宽带无线通信系统(UWB)的基本原理,主要特点以及它所涉及的关键技术,目前产生UWB脉冲信号的方法。并提出了一种用SystemView产生UWB信号的方法,最后给出了结果。     

一种MQAM信号的识别算法

由于MQAM信号的概率密度函数服从莱斯分布，从而用莱斯分布来构造识别算法。在信噪比满足SNR≥13db的条件下，识别性能良好。     

基于WIFI物联网的家电智能控制系统信息控制端的研究

随着WiFi无线通信技术的发展和普及,WiFi已成为当今无线网络接入的主流标准。本文以智能家居广阔的市场需求为基础,选取家庭智能控制系统为研究对象,基于ARMS3C2440处理器和Linux嵌入式操作系统基础上,利用WiFi模块组建了家庭无线网络,采用Java技术为平台,实现一个可以在WiFi热点区域接入互联网的无线通信终端,并可以对家电设备远程控制。经测试,信息控制端可以在WiFi信号覆盖区域接入因特网,系统启动和运行正常,证明这种网络控制的方案是可行的。     

Luminescent property and energy transfer from Ce3+ to Tb3+ in YAl3(BO3)4

A series of Ce³⁺, Tb³⁺ or Ce³⁺/Tb³⁺ doped YAl₃(BO₃)₄ phosphors are synthesized by a high temperature solid-state reaction, and their luminescent properties are investigated. YAl₃(BO₃)₄:Ce³⁺ shows a broad emission band at 422 nm under the 367 nm radiation excitation. YAl₃(BO₃)₄:Tb³⁺ can be efficiently excited by the ultraviolet (UV) light, and produces green emission. The emission intensity of YAl₃(BO₃)₄:Tb³⁺ can be enhanced by adjusting Tb³⁺ doped content, and reaches the maximum at 0.06 mol Tb³⁺. When Ce³⁺ is codoped, the emission intensity of Tb³⁺ in YAl₃(BO₃)₄ can be enhanced, but the commission international del’eclairage (CIE) chromaticity coordinates of YAl₃(BO₃)₄:Tb³⁺ have almost no change. Moreover, the energy transfer from Ce³⁺ to Tb³⁺ in YAl₃(BO₃)₄ is studied.