Awardee Selection Procedures,With Special Reference to the Frank Wilcoxon and Jack Youden Prizes

The selection procedures used currently and since 1977 for award of the Frank Wilcoxon and Jack Youden prizes are described. Using real data from the 1976 awards competition, it is shown that different methods of combining judges' ratings would yield different winners, and that which procedure is best is not intuitively obvious. Finally it is shown how the current method was chosen on the basis of probability of correct selection considerations.     

A 5-GHz LC VCO with digital AAC and AFBS for 2.4 GHz ZigBee transceiver applications

A 5 GHz LC VCO (voltage-controlled oscillator) with automatic amplitude control (AAC) and automatic frequency-band selection (AFBS) for 2.4 GHz ZigBee transceivers is presented. Instead of continuous feedback loop, an alternative amplitude calibration scheme is proposed in this paper to alleviate the deficiencies inherent in the conventional approach. It helps to keep the VCO at optimum amplitude to avoid saturation of the cross-coupled transistors and therefore stabilizes the phase noise performance over process, voltage and temperature variations. For the ZigBee application with 16 frequency channels, a coarse tuning loop is added in this work to implement the frequency-band selection using the AFBS mechanism. The VCO core and the digital AAC, AFBS modules have been fully integrated in a 2.4 GHz ZigBee transceiver which was fabricated in a 0.18 μm RF-CMOS technology. The current consumption is 4.7 mA at 4.85 GHz with 1.8 V power supply and a chip area of about 0.285 mm² is occupied. The VCO is capable of operating from 4.67 GHz to 5.18 GHz and the measured phase-noise level is –120 dBc/Hz at 1 MHz offset from a 4.85 GHz carrier. The tuning sensitivity K_VCO of the VCO is about 78 MHz/V with 0.9 V control voltage.     

Final contractor selection using the analytical hierarchy process

Some contractor selection methods currently in existence are criticized as incomplete and biased, and lacking consideration in terms of the contractor's ability to achieve simultaneously, time, cost, quality and safety standards. This research examines an alternative contractor selection model called the analytical hierarchy process (AHP), which will help construction clients to identify contractors with the best potential to deliver satisfactory outcomes in a final contractor selection process which is not based simply on the lowest bid. The AHP comprises three parts: hierarchic structure, prioritization procedure, and calculation of results. This model is tested by a hypothetical scenario where three contractor candidates are evaluated. The criteria used for contractor selection in the model have been identified, and the significance of each criterion has been arrived at by conducting a questionnaire survey in public organizations in Hong Kong. Comparisons are made by ranking the aggregate scores of each candidate with regard to their performance against each of the criteria, and the candidate associated with the highest scores is the best contractor on this occasion.     

低压配电系统保护线截面的选择

介绍了低压配电系统保护线截面选择的主要要求，并就简化保护线截面选择问题提出了建议。     

综采工作面轨道顺槽运输系统的选定

通过实例，介绍了综采工作面准备期间轨道顺槽运输系统的选定方法，包括：绞车位置、型号及钢丝绳的选型计算和运输的注意事项。     

地下采矿方法选择的多属性决策

地下采矿方法的选择需要能准确地给出各影响因素的权重系数，目前的选择方法未能很好地解决该问题。为此，采用客观赋权法并应用多目标决策进行方案的排序优选。实践表明，效果良好。     

聚类分析中特征选择的研究

介绍了一种新颖的基于高斯混合模型的特征选择算法,并且应用该方法的结果对模拟数据和真实数据进行聚类。实验结果表明,该算法可以有效地确定显著属性,提高聚类准确度。     

一个普通话文语转换系统中的韵律模型

韵律模型是文语转换系统中的重要组成部分,对合成语音的自然度起着至关重要的作用。结合人工神经网络和单元选择算法,将它们分别应用于韵律模型中时长和基频曲线的生成,其中时长模型采用三层的反向传播网络,而基频模型则采用一种基于最小距离和的单元选择算法。     

一种新的回归变量选择方法

本文就多元线性回归模型,提出一种回归变量选择方法,其基本思想是利用矩阵的扫描运算和变量间的相关性分析,根据自变量（回归变量）与因变量之间相关性越强对因变量的解释作用越强的原则,选择回归变量。用本文提出的方法选择回归变量,具有降低回归模型复杂度、提高模型精确性和可靠性、便于工程实现的优点。仿真算例证实了该方法的有效性和可行性。     

从企业总部地址迁移变化看CBD的发展态势

当前的企业总部的迁移有以下几个方面特征:欠发达区域的知名企业总部向中心城市或者省会城市聚集;跨国公司在中国的中心城市设立具有总部功能的办公机构;中心城市特别是CBD已经形成总部经济的空间聚集形态.在集聚效应规律的作用下促使CBD出现规模扩大化、办公空间扩散化、职能高级化等趋势.