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Power Optimization Technique for Pulsed Latches  [PDF]
P.Sreenivasulu,Dr. K.Srinivasa Rao,J.I.R Prakash
International Journal of Soft Computing & Engineering , 2013,
Abstract: In this paper, we implement a design technique forregisters used in pulsed latches in order to make leakage currentlow thus reducing standby power consumption. This is made byconsidering short or long timing path and launching or capturingregister. In this work each register trades clock-to-Q delaymaintaining the same timing constraints, setup time and hold timemaintaining clock-to-Q delay constant for reducing the leakagecurrent by developing three different dual threshold voltageregisters. The overall reduction in the leakage current of a registercan exceed 90% while maintaining the clock frequency and otherdesign parameters such as area and dynamic power the same.This work presents an elegant methodology using pulsed latchinstead of flip-flop without altering the existing design style. Itreduces the dynamic power of the clock network, which canconsume half of a chip's dynamic power. Real designs have shownapproximately a 20 percent reduction in dynamic power using thebelow methodology. Three ISCAS 89 benchmark circuits areutilized to evaluate the methodology, demonstrating, on average,23% reduction in the overall leakage current. The overallreduction in leakage current is compared for each case indifferent technologies. Predictive device models are used for eachtechnology. The analysis is performed using H-SPICE.
Techniques for effective vocabulary selection  [PDF]
Anand Venkataraman,Wen Wang
Computer Science , 2003,
Abstract: The vocabulary of a continuous speech recognition (CSR) system is a significant factor in determining its performance. In this paper, we present three principled approaches to select the target vocabulary for a particular domain by trading off between the target out-of-vocabulary (OOV) rate and vocabulary size. We evaluate these approaches against an ad-hoc baseline strategy. Results are presented in the form of OOV rate graphs plotted against increasing vocabulary size for each technique.
An Effective Fingerprint Verification Technique  [PDF]
Minakshi Gogoi,D K Bhattacharyya
Computer Science , 2010,
Abstract: This paper presents an effective method for fingerprint verification based on a data mining technique called minutiae clustering and a graph-theoretic approach to analyze the process of fingerprint comparison to give a feature space representation of minutiae and to produce a lower bound on the number of detectably distinct fingerprints. The method also proving the invariance of each individual fingerprint by using both the topological behavior of the minutiae graph and also using a distance measure called Hausdorff distance.The method provides a graph based index generation mechanism of fingerprint biometric data. The self-organizing map neural network is also used for classifying the fingerprints.
A HYBRID SWITCHING LOSS REDUCTION TECHNIQUE ALONG WITH INDEPENDENT CONTROL OF TWO THREE PHASE LOADS FOR NINE SWITCH SPACE VECTOR MODULATED INVERTER
S.KRISHNARAJ,,Dr.S.HIMAVATHI
International Journal of Engineering Science and Technology , 2011,
Abstract: For industrial applications many motors are used and the converter which drives the motor produces enormous losses and inject harmonics into the system . For example, motors are used to manipulate industrial robots, electric vehicles with in-wheel motors and electric trains. For controlling the PM motors there are two methods existing they are providing an inverter to control each motor, andconnecting the motors in parallel and driving them with a single inverter. The first method makes an experimental apparatus complex and expensive; the second does not allow independent control of eachmotor because of differences in rotor angle between the two motors. Thus, we propose a hybrid nineswitch inverter that can independently control two three-phase loads and also reduces the switching lossesgreatly. This paper introduces the structure of the nine-switch nverter, which is made from nine switches and a hybrid switching loss reduction technique. The validity of the proposed inverter is verified through simulations and reduced switching loss will reduce the size of heat sinks leading a compact power converters.
A Novel Feature Selection and Extraction Technique for Classification  [PDF]
Kratarth Goel,Raunaq Vohra,Ainesh Bakshi
Computer Science , 2014, DOI: 10.1109/SMC.2014.6974562
Abstract: This paper presents a versatile technique for the purpose of feature selection and extraction - Class Dependent Features (CDFs). We use CDFs to improve the accuracy of classification and at the same time control computational expense by tackling the curse of dimensionality. In order to demonstrate the generality of this technique, it is applied to handwritten digit recognition and text categorization.
A Fuzzy Clustering Technique for Adapting Tournament Selection
Abdelaziz El Moujahid,Khalid Jebari,Abdelaziz Bouroumi,Aziz Ettouhami
International Journal of Soft Computing , 2012, DOI: 10.3923/ijscomp.2011.62.67
Abstract: Tournament selection is a popular selection scheme commonly used in genetic algorithms. This method depends largely on the size of the tournament which influences the quality of the final solution. In this study, a new technique is used to dynamically adjust the tournament size using the fuzzy c-means algorithm. The efficiency of the proposed technique is shown by using several benchmark test functions.
Novel Gas-Doping Technique for Local Spectroscopic Measurements in Pulsed-Power Systems  [PDF]
R. Arad,L. Ding,Y. Maron
Physics , 1998, DOI: 10.1063/1.1148791
Abstract: A novel method for doping plasmas in pulsed-power experiments with gaseous elements has been developed. A fast gas valve, a nozzle, and a skimmer are used to generate an ultrasonic gas beam that is injected into a planar-geometry microsecond plasma-opening-switch (POS). An array of ionization probes with relatively high spatial and temporal resolutions was developed for diagnosing the absolute injected-gas density and its spatial profile. The properties of the gas column were also studied using spectroscopy of line emission that results from the interaction of the doped gas with the POS prefilled plasma. The doped column is found to have a width of ~1 cm and a density of (0.8-1.7)*10^14 cm-3. Observations of characteristic emission lines from the doped atoms and their ions allow for various spectroscopic measurements, such as the magnetic field from Zeeman splitting and the ion velocity distributions from Doppler shifts, that are local in three dimensions. It is shown that this gas doping technique can also be used to study proton-dominated plasmas that cannot be studied with simple emission spectroscopy due to the lack of light emitting ions. The variety of gases used with this method, together with the small valve dimensions and its fast opening, make it potentially useful for broad diagnostics of various short-duration plasma experiments.
A Dual-Band Impedance Transforming Technique with Lumped Elements for Frequency-Dependent Complex Loads
Byeong-Taek Moon;Noh-Hoon Myung
PIER , 2013, DOI: 10.2528/PIER12111811
Abstract: In this paper, a new technique to realize lumped dual-band impedance transformers for arbitrary frequency-dependent complex loads is proposed. For the complex impedance transforming, closed-form design equations are presented for a series-shunt and a shunt-series type and a concept of combination is also presented. They use the proposed equation of input impedance. This equation can easily and exactly obtain the input impedance of any two-port network using the ABCD matrix. Then, in order to realize dual-band operation, four topologies comprising two types and a design method are presented. This technique is numerically demonstrated by various examples with excellent results and it has advantages of simplicity, intuitiveness and versatility because it is a general solution for complex impedance transforming. The proposed dual-band impedance transforming technique can be utilized for practical matching problems such as microwave amplifiers and other devices.
High Power Er/Yb Codoped Double Clad Fiber Pulsed Amplifier Based on an All-Fiber Configuration

ZHOU Lei,NING Ji-Ping,CHEN Cheng,HAN Qun,ZHANG Wei-Yi,WANG Jun-Tao,

中国物理快报 , 2009,
Abstract: We report an all-fiber two-stage high power pulsed amplifier, seeded with a 1550nm, 1kHz repetition rate rectangular pulse, and based on Er/Yb co-doped double clad fiber. All the characteristics are measured in the experiment. The maximal slope efficiency is 22.56%, which is the highest we know of at such a low repetition rate, and the maximal output signal power is 1W. The various factors that affect the pulsed amplifier performance are analyzed. A high output power while keeping high power conversion efficiency can be obtained with careful selection of the input power, pump power and repetition rate. The experimental results show that the crucial parameters should be optimized when designing all-fiber pulsed amplifiers.
The losses at power grid caused by small nonlinear loads  [PDF]
Stevanovi? Dejan,Petkovi? Predrag
Serbian Journal of Electrical Engineering , 2013, DOI: 10.2298/sjee1301209s
Abstract: The difference between registered active power and spent unregistered power represents the losses at power grid. This paper treats problems related to losses caused by nonlinear loads connected to the power grid. In recent years the load profile of power consumers turned from energy-waster linear to energysaver but non-linear loads. The main cause of the losses appears due to the lack of adequate measurement equipment. Namely, common household power meters register only active energy, while power meters for industrial application register reactive energy as well. This approach does not follow the change of the enduser profile. Tendency of improving energy efficiency brought wide use of switching mode regulators and replace old incandescent light bulb with new energy saving lamps (CFL - compact fluorescent lamp, LED bulb). Therefore, the number of non-linear load drastically increased. Registering only active component of power at consumer’s side does not depict the real profile of the consumption. Therefore, in this paper we analyse and quantify the effects of nonlinear loads at power losses. As a result we suggest an efficient method for measuring the distortion component of power. The method relays on low-cost upgrade of commercial electronic power meters. The presented results of measurements on small non-linear loads confirm the proposed technique. Besides, they prove the importance of measuring all components of apparent power and justified their use in billing policy. The implemented set-up is based on power meter manufactured by EWG of Ni . [Projekat Ministarstva nauke Republike Srbije, br. TR32004]
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