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Search Results: 1 - 10 of 1803 matches for " medoid fine-tuning "
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Efficient K-medoids clustering algorithm
一种高效的K-medoids聚类算法

夏宁霞,苏一丹,覃希
计算机应用研究 , 2010,
Abstract: Due to the disadvantages of sensitivity to the initial selection of the medoids and poor performance in large data set processing in the K-medoids clustering algorithm, this paper proposed an improved K-medoids algorithm based on a fine-tuned of initial medoids and an incremental candidate set of medoids. The proposed algorithm optimized initial medoids by fine-tu-ning and reduced computational complexity of medoids substitution through expanding medoids candidate set gradually. Expenrimental results demonstrate the effectiveness of this algorithm,which can improve clustering quality and significantly shorten the time in calculation compared with the traditional K-medoids algorithm.
Naturalistic vs Supernatural Explanations: “Charting” a Course away from a Belief in God by Utilizing Inference to the Best Explanation  [PDF]
Randall S. Firestone
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.43034
Abstract: The article critiques the seven major arguments supporting a belief in God. The arguments are presented as Inferences to the Best Explanation with the use of charts. The charts graphically demonstrate that naturalistic explanations are being ignored by the theist, who favors inherently unverifiable supernatural explanations over naturalistic ones. The paper also discusses why metaphysical beliefs should not be trusted, and how such beliefs differ from scientific beliefs. The paper concludes that the arguments for the existence of God fail because the naturalistic explanations are the best explanations and should be accepted over the supernatural explanation of God. To the extent that the charting of all seven arguments is new, it should be a helpful explanatory tool, especially for students.
Study of Improved Particle Swarm Optimization
改进粒子群优化算法研究

WANG Yong,ZHANG Wei,CHEN Jun,WEI Peng-cheng,
王勇
,张伟,陈军,韦鹏程

计算机科学 , 2009,
Abstract: This paper intends to develop an improved particle swarm optimization(PSO) algorithm.The proposed method will introduce "Fine-Tuning" into the PSO algorithm which can promote the ability of local search to modify the defects of high similarity of individual particles on the late period of search following PSO algorithm.At last the performance of the improved PSO and PSO will be compared by optimizing five massively multimodal functions with varying complexities.The results show that the performance of the i...
A multiple-pass ring oscillator based dual-loop phase-locked loop
一种基于环形振荡器的双环路锁相环

Chen Danfeng,Ren Junyan,Deng Jingjing,Li Wei,Li Ning,
陈丹凤
,任俊彦,邓晶晶,李巍,李宁

半导体学报 , 2009,
Abstract: 本文设计并实现一种宽带应用的高频双环路锁相环。这种双环路结构将一个粗调谐环路与一个细调谐环路相结合来提供较宽的频率调谐范围和较低的VCO增益。文中对这种双环路锁相环的相位噪声和参考时钟杂散特性进行了着重分析,结果表明这种结构能够提高相位噪声特性。并且设计了一个同时采用电压控制和电流控制的多通路环形振荡器来满足双环路的架构要求。芯片通过Jazz 0.18-μm RF CMOS工艺流片,测试结果显示其频率调谐范围为4.2GHz到5.9GHz. 当该双环路锁相环工作在5.5GHz时,相位噪声为-99dBc/Hz@1MHz。
可动磁柱式粗调/微调复合调感电抗器原理
Coarse-tuning/fine-tuning adjustment theory of moveable magnetic-pillar reactor

官瑞杨,魏新劳,王永红,陈庆国
- , 2018, DOI: 10.11835/j.issn.1000-582X.2018.07.008
Abstract: 电力电抗器电感值的快速可调和局部微调在电力系统运行过程中具有重要作用。为此,提出一种可实现粗调/微调复合调感的电抗器原理,通过调节两磁柱之间的平行间距使工作磁路及其磁阻发生改变进而实现电感值连续调节。结合磁路的欧姆定律推导电感值理论计算公式;建立电抗器三维磁场仿真模型,运用有限元法计算磁场分布和电感值;详细分析电感调节特性。研究结果表明:可动磁柱的位置使工作磁路发生改变,工作磁路由一条变成3条,再由3条过渡为2条;电感值与调节距离呈双指数规律变化,随着调节距离增大,电感值减小;电感调节特性曲线分为快速调感区、过渡区和微调电感区3个区域;这种电抗器可实现粗调/微调复合调感。
Coarse-tuning and fine-tuning adjustment of the power reactor's inductance is very important for the operation of power system. Thus, a theory is proposed that could achieve the coarse-tuning and fine-tuning adjustment of inductance by adjusting the distance between the two magnetic-pillars to change the working magnetic circuits and its reluctance so as toachieve a continuous adjustment of inductance. Combined with magnetic circuit of Ohm's law the calculating formula of inductance could be deduced; modeling reactor's 3D magnetic-field, magnetic flux density and inductances could be caculated by finite element method.And the feature of inductance's adjustment curve is analysed in detail. The results show that the position of moveable magnetic-pillar could change the working magnetic circuit, and the number of working magnetic circuits changes from one to three, then from three to two; the relationship between inductance and the distance of two magnetic-pillars is a double exponential function. When the distance between the two magnetic-pillars increases, the inductance decreases; the inductance's adjustment curve is composed of three areas:coarse-tuning area, transition area and fine-tuning area. The reactor based on this theory could achieve coarse-tuning/fine-tuning adjustment of inductance
High Precision Signal Processing Algorithm for White Light Interferometry
Jeonggon Harrison Kim
Sensors , 2008, DOI: 10.3390/s8127609
Abstract: A new signal processing algorithm for absolute temperature measurement using white light interferometry has been proposed and investigated theoretically. The proposed algorithm determines the phase delay of an interferometer with very high precision (<< one fringe) by identifying the zero order fringe peak of cross-correlation of two fringe scans of white light interferometer. The algorithm features cross-correlation of interferometer fringe scans, hypothesis testing and fine tuning. The hypothesis test looks for a zero order fringe peak candidate about which the cross-correlation is symmetric minimizing the uncertainty of mis-identification. Fine tuning provides the proposed algorithm with high precision subsample resolution phase delay estimation capability. The shot noise limited performance of the proposed algorithm has been analyzed using computer simulations. Root-mean-square (RMS) phase error of the estimated zero order fringe peak has been calculated for the changes of three different parameters (SNR, fringe scan sample rate, coherence length of light source). Computer simulations showed that the proposed signal processing algorithm identified the zero order fringe peak with a miss rate of 3 x 10-4 at 31 dB SNR and the extrapolated miss rate at 35 dB was 3 x 10-8. Also, at 35 dB SNR, RMS phase error less than 10-3 fringe was obtained. The proposed signal processing algorithm uses a software approach that is potentially inexpensive, simple and fast.
Coaxial Filters Optimization Using Tuning Space Mapping in CST Studio
D. Wolansky,R. Tkadlec
Radioengineering , 2011,
Abstract: This paper deals with the optimization of coaxial filters using Tuning Space Mapping (TSM) method implemented to CST environment. The function of fine and coarse model and their link between each other is explained. In addition, supporting macros programmed in VBA language, which are used for maximum efficiency of the optimization from the user′s point of view, are mentioned. Macros are programmed in CST and are also used for automatic calibration constants determination and for automatic calibration process between the coarse model and the fine model. The whole algorithm is illustrated on the particular seven-order filter design and optimized results are compared to measured ones.
A New Theory of Hearing
Nematollah Rouh bakhsh
Audiology , 1998,
Abstract: Recent studies have demonstrated that outer hair cells play two functional roles in the ear: one is the sensory function and the other is motor one. The function of OHCs in being trigered with very poor signals can not be overlooked. This mechanism would lead in improving the sensitivity of the ear. As stimulus intensity increases, little by little, OHC will reach its saturation level and finally the amplification effect decreases. Otoacoustic emissions could be reverberations produced by the responses of outer hair cells .Any decrease in the number of OHCs can cause a mechanical split in the fine tuning mechanism of the organ of corti and result in hearing loss.
Seasonal Composite Landsat TM/ETM+ Images Using the Medoid (a Multi-Dimensional Median)
Neil Flood
Remote Sensing , 2013, DOI: 10.3390/rs5126481
Abstract: Multi-temporal satellite imagery can be composited over a season (or other time period) to produce imagery which is representative of that period, using techniques which will reduce contamination by cloud and other problems. For the purposes of vegetation monitoring, a commonly used technique is the Maximum NDVI Composite, used in conjunction with variety of other constraints. The current paper proposes an alternative based on the medoid (in reflectance space) over the time period (the medoid is a multi-dimensional analogue of the median), which is robust against extreme values, and appears to be better at producing imagery which is representative of the time period. For each pixel, the medoid is always selected from the available dates, so the result is always a single observation for that pixel, thus preserving relationships between bands. The method is applied to Landsat TM/ETM+ imagery to create seasonal reflectance images (four per year), with the aim being a regular time series of reflectance values which captures the variability at seasonal time scales. Analysis of the seasonal reflectance values suggests that resulting temporal image composites are more representative of the time series than the maximum NDVI seasonal composite.
ELECTRONIC SYSTEM FOR EXPERIMENTATION IN AC ELECTROGRAVIMETRY II: IMPLEMENTED DESIGN
Torres,Robinson; Arnau,Antonio; Perrot,Hubert; Aedo,José Edinson;
Revista EIA , 2007,
Abstract: a detailed description of the electronic system designed to improve the measurements in an experimental ac electrogravimetry setup is presented. this system is committed to acquire appropriated data for determining the electrogravimetric transfer function (egtf) and provide information regarding the mass transfer in an electrochemical cell in the ac electrogravimetry technique, but maintaining a good trade-off between the locking frequency bandwidth and the resolution in the frequency tracking, that is, enlarging the bandwidth of the system to follow signals with frequency as higher as 1 khz, but maintaining an accurate and continuous tracking of this signal. the enlarged bandwidth allows the study of fast kinetic process in electrochemical applications and the continuous tracking let to achieve a precise measurement with good resolution rather than average frequency records obtained by conventional frequency meters. the system is based on an analogue-digital phase locked loop (a-d pll).
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