Tesis sobre el tema "Reduction technique"
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Wise, Michael Anthony. "A variance reduction technique for production cost simulation". Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182181023.
Texto completoPanwher, Mohammad Ibrahim. "A novel technique for tube sinking". Thesis, Sheffield Hallam University, 1986. http://shura.shu.ac.uk/20183/.
Texto completoCoupland, Jeremy. "Particle image velocimetry : data reduction using optical correlation". Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255649.
Texto completoKoh, Jeongwook. "Low-frequency-noise reduction technique for linear analog CMOS IC's". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979089980.
Texto completoMiah, Tunu. "Vanishing windows : a technique for adaptive screen management". Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/27081.
Texto completoBarbarulo, Andrea. "On a PGD model order reduction technique for mid-frequency acoustic". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00822643.
Texto completoSim, Zee Ang. "PAPR Reduction in Multicarrier Communication Systems Using Efficient Pulse Shaping Technique". Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/79917.
Texto completoHoulis, Pantazis Constantine. "A novel parametrized controller reduction technique based on different closed-loop configurations". University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0052.
Texto completoRosa, Thiago Raupp da. "Reduction of energy consumption in MPSOCS through a dynamic frequency scaling technique". Pontifícia Universidade Católica do Rio Grande do Sul, 2012. http://hdl.handle.net/10923/1482.
Texto completoNoC-based MPSoCs are employed in several embedded systems due to the high performance, achieved by using multiple processing elements (PEs). However, power and energy restrictions, especially in mobile applications, may render the design of MPSoCs over-constrained. Thus, the use of power management techniques is mandatory. Moreover, due to the high variability present in application workloads executed by these devices, this management must be performed dynamically. The use of traditional dynamic voltage and frequency scaling (DVFS) techniques proved to be useful in several scenarios to save energy. Nonetheless, due to technology scaling that limits the voltage variation and to the slow response of DVFS schemes, the use of such technique may become inadequate in newer DSM technology nodes. As alternative, the use of dynamic frequency scaling (DFS) may provide a good trade-off between power savings and power overhead. This work proposes a self-adaptable distributed DFS scheme for NoC-Based MPSoCs. Both NoC and PEs have an individual frequency control scheme. The DFS scheme for PEs takes into account the PE computation and communication loads to dynamically change the operating frequency. In the NoC, a DFS controller uses packet information and router activity to decide the router operating frequency. Also, the clock generation module is designed to provide a clock signal to PEs and NoC routers. The clock generation method is simple, based on local selective clock gating of a single global clock, provides a wide range of generated clocks, induces low area and power overheads and presents small response time. Synthetic and real applications were used to evaluate the proposed scheme. Results show that the number of executed instructions can be reduced by 65% (28% in average), with an execution time overhead up to only 14% (9% in average).The consequent power dissipation reduction in PEs reaches up to 52% (23% in average) and in the NoC up to 76% (71% in average). The power overhead induced by the proposed scheme is around 3% in PEs and around 10% in the NoC.
MPSoCs baseados em NoC têm sido empregados em sistemas embarcados devido ao seu alto desempenho, atingido através do uso de múltiplos elementos de processamento (PEs). Entretanto, a especificação da funcionalidade, agregada a especificação de requisitos de consumo de energia em aplicações móveis, pode comprometer o processo de projeto em termos de tempo e/ou custo. Dessa forma, a utilização de técnicas para gerenciamento de consumo de energia é essencial. Além disso, aplicações que possuam carga de trabalho dinâmica podem realizar esse gerenciamento dinamicamente. A utilização de técnicas para escalonamento dinâmico de tensão e frequência (DVFS) mostrou-se adequada para a redução do consumo de energia em sistemas computacionais. No entanto, devido à evolução da tecnologia, a variação mínima de tensão é menor, e o tempo de resposta elevado dos métodos de DVFS pode tornar esta técnica inadequada em tecnologias DSM (deep sub-micron). Como alternativa, a utilização de técnicas para escalonamento dinâmico de frequência (DFS) pode prover uma boa relação custo-benefício entre economia e consumo de energia. O presente trabalho apresenta um esquema de escalonamento dinâmico de frequência distribuído auto-adaptável para MPSoCs baseados em NoC. Ambos os elementos do MPSoC (NoC e PEs) possuem um esquema específico. O esquema para os PEs leva em consideração as cargas de computação e comunicação do mesmo. Na NoC, o esquema é controlado através de informações provenientes do pacote que trafega na rede e da atividade do roteador. Além disso, um módulo para geração local de relógio é apresentado, o qual é responsável por prover o sinal de relógio para PEs e roteadores da NoC.O esquema de geração do sinal de relógio é simples, baseado em roubo de ciclo de um sinal de relógio global. Este ainda fornece uma ampla variedade de frequências, induz baixo custo adicional de área e consumo e responde rapidamente a uma nova configuração. Para avaliar o esquema proposto, aplicações sintéticas e reais foram simuladas. Os resultados mostram que a redução no número de instruções executadas é de até 65% (28% em média), com um custo adicional de no máximo 14% no tempo de execução (9% em média). Em relação à dissipação de potência, os resultados mostram que a redução é de até 52% nos PEs (23% em média) e de até 76% na NoC (71% em média). O overhead de consumo apresentado pelo esquema dos PEs é de 3% e pelo esquema da NoC é de 10%.
Buckley, Richard James. "A digital signal processing-based predistortion technique for reduction of intermodulation distortion /". Online version of print, 1993. http://hdl.handle.net/1850/11455.
Texto completoLouvin, Henri. "Development of an adaptive variance reduction technique for Monte Carlo particle transport". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS351/document.
Texto completoThe Adaptive Multilevel Splitting algorithm (AMS) has recently been introduced to the field of applied mathematics as a variance reduction scheme for Monte Carlo Markov chains simulation. This Ph.D. work intends to implement this adaptative variance reduction method in the particle transport Monte Carlo code TRIPOLI-4, dedicated among others to radiation shielding and nuclear instrumentation studies. Those studies are characterized by strong radiation attenuation in matter, so that they fall within the scope of rare events analysis. In addition to its unprecedented implementation in the field of particle transport, two new features were developed for the AMS. The first is an on-the-fly scoring procedure, designed to optimize the estimation of multiple scores in a single AMS simulation. The second is an extension of the AMS to branching processes, which are common in radiation shielding simulations. For example, in coupled neutron-photon simulations, the neutrons have to be transported alongside the photons they produce. The efficiency and robustness of AMS in this new framework have been demonstrated in physically challenging configurations (particle flux attenuations larger than 10 orders of magnitude), which highlights the promising advantages of the AMS algorithm over existing variance reduction techniques
Phillips, Rhonda D. "Improving the Performance of a Hybrid Classification Method Using a Parallel Algorithm and a Novel Data Reduction Technique". Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/42680.
Texto completoMaster of Science
Yang, Yuchen. "Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies". Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49263.
Texto completoMaster of Science
Kitchen, Christine A. "Analysis and reduction of grid errors in the finite difference Poisson-Boltzmann technique". Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247197.
Texto completoThorne, Simon. "An alternative modelling technique for the reduction of error in decision support spreadsheets". Thesis, Cardiff Metropolitan University, 2008. http://hdl.handle.net/10369/6492.
Texto completoLollini, Emanuele. "Analysis of multi-station technique for noise reduction in Deep Space Doppler tracking". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25914/.
Texto completoSignorello, Concetta. "Reduction of Switching Losses in IGBT Power Modules". Doctoral thesis, Università di Catania, 2015. http://hdl.handle.net/10761/4056.
Texto completoRoy, Soumyaroop. "A compiler-based leakage reduction technique by power-gating functional units in embedded microprocessors". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001832.
Texto completoZhao, Yuxin. "Efficient erasure marking technique for delay reduction in DSL systems impaired by impulse noise". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110650.
Texto completoLes technologies de Ligne d'abonné numérique (DSL) ont connu un développement rapide. La protection des systèmes de DSL contre le bruit impulsif (IN) est une question importante et elle a récemment suscité attention considérable. Normalement, une combinaison decodes RS et d'entrelacement est employée pour atténuer les effets destructifs du IN. Mais, il est établi que la structure d'entrelacement introduit des longs retards qui sont certainement indésirables dans les systèmes de transmission à haut débit qui supportent des applications interactives telles que la télévision sur IP (IPTV). Donc, il existe des techniques différentes pour réduire le retard d'entrelacement tout en étant capables de protéger efficacement les systèmes contre l'IN. En particulier, le décodage d'erreur et d'effacement (EED) peut être utilisé au lieu du décodage d'erreur (ED) afin d'améliorer la capacité de correction du décodeur, qui, à son tour, contribue à réduire la profondeur de l'entrelacement requise et les retards. Pour explorer la capacité de correction d'erreurs de l'EED, une méthode fiable pour marquer les effacements devient très essentielle. Cette thèse propose une technique de marquage de l'effacement qui utilise pleinement la capacité de correction de l'EED, et, par conséquence, entraîne un entrelacement plus court. Nous étudions d'abord les sources qui produisent l'IN et les statistiques de l'IN dans les systèmes DSL. Des modèles analytiques sur la distribution de l'amplitude et de l'intervalle entre les arrivées de l'IN sont fournis. En se basant sur les statistiques de l'IN, nous proposons une technique de marquage des suppressions basée sur la distance carrée. De plus, une analyse de la sélection des paramètres appropriés pour la technique proposée est développée. Finalement, la performance du rapport puissance maximale instantanée sur bruit (PSNR) de l'IPTV dans les systèmes de DSL en présence de l'IN est examinée avec la technique de marquage des suppressions proposée.
Ellis, Geoffrey. "Random sampling as a clutter reduction technique to facilitate interactive visualisation of large datasets". Thesis, Lancaster University, 2008. http://eprints.lancs.ac.uk/42392/.
Texto completoKim, Hongman. "Statistical Modeling of Simulation Errors and Their Reduction via Response Surface Techniques". Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28390.
Texto completoPh. D.
Kalb, Arthur J. (Arthur Joseph). "An open-loop method for reduction of torque ripple and an associated thermal-management technique". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42595.
Texto completoIncludes bibliographical references (leaves 202-204).
by Arthur Joseph Kalb.
M.S.
Eubanks, Sean Gilrea. "Development and application of a rapid screening technique for the isolation of selernium reduction-deficient mutants of Shewanella putrefaciens". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/25636.
Texto completoRavi, Ajaay. "Run-Time Active Leakage Control Mechanism based on a Light Threshold Voltage Hopping Technique (LITHE)". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1302550444.
Texto completoMerwe, Andria van der. "A novel signal processing technique for clutter reduction in GPR measurements of small, shallow land mines /". The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488193272068967.
Texto completoSetlur, Nagesh Swetadri Vasan. "Improved imaging for x-ray guided interventions| A high resolution detector system and patient dose reduction technique". Thesis, State University of New York at Buffalo, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3613101.
Texto completoOver the past couple of decades there has been tremendous advancements in the field of medicine and engineering technology. Increases in the level of integration between these two branches of science has led to better understanding of physiology and anatomy of a living organism, thus allowing for better understanding of diseases along with their cures and treatments. The work presented in this dissertation aims at improving the imaging aspects of x-ray image guided interventions with endovascular image guided intervention as the primary area of application.
Minimally invasive treatments for neurovascular conditions such as aneurysms, stenosis, etc involve guidance of catheters to the treatment area, and deployment of treatment devices such as stents, coils, balloons, etc, all under x-ray image guidance. The features in these device are in the order of a few 10 µm's to a few 100 µm's and hence demand higher resolution imaging than the current state of the art flat panel detector. To address this issue three high resolution x-ray cameras were developed. The Micro Angiography Fluoroscope (MAF) based on a Charge Coupled Device (MAF-CCD), the MAF based on Complementary Metal Oxide Semiconductors (MAF-CMOS) and the Solid State X-ray Image Intensifier based on Electron Multiplying CCDs. The construction details along with performance evaluations are presented. The MAF-CCD was successfully used in a few interventions on human patient to treat neurovascular conditions, primarily aneurysm. Images acquired by the MAF-CCD during these procedures are presented.
A software platform CAPIDS was previously developed to facilitate the use of the high resolution MAF-CCD in a clinical environment. In this work the platform was modified to be used with any camera. The upgrades to CAPIDS, along with parallel programming including both the Graphics Processing Unit (GPU) and Central Processing Unit (CPU) are presented.
With increasing use of x-ray guidance for minimally invasive interventions, a major cause of concern is that of prolonged exposure to x-ray radiation that can cause biological damage to the patient. Hence during x-ray guided procedures necessary steps must be taken to minimize the dose to the patient. In this work a novel dose reduction technique, using a combination of Region of Interest (ROI) fluoroscopy to reduce dose along with spatially different temporal filtering to restore image quality is presented.
Finally a novel ROI imaging technique for biplane imaging in interventional suites, combining the use of high resolution detector along with dose reduction technique using ROI fluoroscopy with spatially different temporal filtering is presented.
Azevedo, Francisco Bernardo. "Cost Reduction Technique for Mutation Testing". Master's thesis, 2020. https://hdl.handle.net/10216/129884.
Texto completoAzevedo, Francisco Bernardo. "Cost Reduction Technique for Mutation Testing". Dissertação, 2020. https://hdl.handle.net/10216/129884.
Texto completoChen, Wen-Chi y 陳文祺. "Noise Reduction Technique for Zero Crossing Detection". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/00579949748941245643.
Texto completo國立臺灣科技大學
電機工程系
103
One of the many issues with developing modern power electronics applications is to keep the spikes and EMI at a minimum, especially when switching AC mains in and out. Switching mains in and out at the zero crossing point requires a precise way of detecting when the next crossing will be. This raises the need for a cost efficient way to detect the zero crossing points. Accurate detection of true zero crossings is important in many fields of industrial electronics such as motor drives, power factor correctors and grid-integrated inverters, where satisfactory line synchronization requires reliable zero crossing information. Zero crossing detection can also be used for other purposes, such as frequency calculation and relative phase measurement. Most of today’s power electronics applications are controlled by microcontrollers; this gives the possibility to prevent the noise for zero crossing detection (ZCD) in a simple and cost efficient way. In this thesis, a simple digital signal processing method is proposed for efficient noise reduction in zero crossing detectors. The proposed method is very robust against strong impulsive noise. In this thesis, a systematic design procedure will be described first, test platform and prototyping circuit are then developed later to validate the correctness of the proposed algorithm. In this thesis, the proposed algorithm is realized using TMS320F28069 digital signal controller (DSC) from Texas Instrument Corp. According to the experimental results, the steady state maximum and minimum errors for 50 Hz AC input waveform are 0.023% and the smallest error is 0.002%. Compared to conventional ZCD methods, 3.272% and 0.345%, the difference is 140 and 170 times. The steady state maximum and minimum errors for 60 Hz AC input waveform are 0.023% and the smallest error is 0.004%. Compared to conventional ZCD methods, 2.029% and 0.685%, the difference is 80 and 170 times, respectively.
Lee, Guan-Yi y 李冠毅. "A Series-Compensator Based Fault Current Reduction Technique". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95175321685287515833.
Texto completo國立清華大學
電機工程學系
99
When voltage sag occur, the sensitive equipment with unexpected shut-downs often result in substantial economic losses, so series compensator are usually used to restore voltage during sag for improving power quality and riding through voltage sag. However, voltage restorer cannot protect sensitive loads when short circuit fault occurs at load side. A fault current mitigation strategy based on the structure of series compensator has been proposed. When the compensator is activated, it acts like a virtual inductor in the system. Not only the fault current can be mitigated effectively, but also the voltage sag problem will not occur at other feeders. In this thesis, a fault current mitigation technique is proposed based on the concept of virtual inductor, whereas both positive and negative sequence inductor are used to mitigate fault current. When grounding fault is detected, positive and negative fault current can be mitigated by virtual inductors which is put in the system by series compensator. The selection on the value of positive and negative sequence inductors are based on the rating of converter. Additionally, the value of optimal virtual inductor are designed respectively under one phase and two phase fault. And using the value of inductor to effectively limit fault current with finite rating of converter. In this thesis, first of all the principles of operation of the proposed that fault current mitigation technique is presented in detail, and the influence of virtual inductor on fault current is derived. Finally, the proposed fault current mitigation algorithm has been tested in simulation and is validated by experiments in laboratory.
"An Adaptive Time Reduction Technique for Video Lectures". Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38760.
Texto completoDissertation/Thesis
Masters Thesis Computer Science 2016
Chih, Kechiang y 遲克強. "Enhancing Distributed Resource Monitor Via Monotonic State Reduction Technique". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/73783243346380461936.
Texto completo東海大學
資訊工程學系
100
With the continuous evolution of network applications, analyzing whether the distributed components satisfy a certain global predicate has become an import issue. A global predicate is a logical statement defined on states of the processes in a distributed system. Detecting global predicates has been difficult due to the combinatorial nature of process states. This thesis discusses the state compression approaches which combines a sequence of execution states into a single representative state in the sense that the detection results still remain correct. This thesis develops an efficient state consolidation algorithm for the global predicates of distributed resource management applications.
Wu, Jiun-Kuan y 吳俊寬. "A Flip-Flop Replacement Technique for Peak Current Reduction". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/07957997948075907290.
Texto completo國立彰化師範大學
電子工程學系
95
As process technology progresses to ultra deep sub-micron, the number of transistors in unit's area is promoted sharply. The number of transistors that simultaneous switching also increase in the circuit. There are many issues that need to challenge in the ultra deep sub-micron circuit, such as the enormous peak current. The enormous peak current will cause the problems, such as electro migration, self-heat in chip, IR drop and ground bounce. They influence the lifespan and the reliability of the chip seriously. They also affect the speed of the execution and accuracy of the signal in the circuit. A huge peak current is observed at each clock rising edge due to the combination circuit simultaneous switching in a high-speed synchronous digital system. We design three groups of the new-type delay flip-flops with different transmission time. We replace selected normal flip-flops not in critical path of a circuit by the new-type delay flip-flops, so the replacement causes the switching times of flip-flops to be separated. Thus it can reduce the peak current and IR drop effect in the circuit. In this thesis, we propose the peak current optimization technology and the algorithm that find the suitable flip-flops in the circuit and then replace them by the new-type delay flip-flops. After the process of the algorithm, the peak current of the circuit can be effective reduced. Key word: ultra deep sub-micron, peak current, electro migration, self-heat, IR drop, ground bounce, critical path.
Chen, Pin-Yi y 陳品頤. "Combination of Variance Reduction Technique on Stochastic Edge Networks". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d3rqz8.
Texto completo國立中央大學
工業管理研究所
106
Due to the apparent drawbacks of Monte Carlo method including comparatively lower sampling efficiency, requiring a large number of samples. Variance Reduction Technique used to improve those drawbacks. The method of sampling will affect the precision, so sampling methods also a part of variance reduction technique. Variance Reduction Technique includes Antithetic random variables(ARV), Control variates technique(CV), Stratification, Importance sampling(IS), Latin hypercube sampling (LHS)and Common random numbers(CRN). Cross-entropy(CE) strategy provides a general, simple and efficient method for solving such problems like the quadratic assignment problem and the rare event-simulation. Before we are sampling, CE strategy is use to choose an importance probability density function(IPDF). And then use LHS to sampling the IPDF we got. After that, used ARV technique can be further to reduce the variance of test function. The simulation results of stochastic edge networks examples show that this combined sampling method with CE strategy (CSMCES) can enhance efficiency under certain level of precision and effectively reduce sample size.
Li, Yu-Shu y 李昱樞. "Design of DC-DC Converter with spur reduction technique". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8fdcdx.
Texto completo元智大學
電機工程學系
106
A DC-DC converter with spur reduction technique is presented in this paper. To achieve this goal, we use the spread spectrum technique and design an updowncounter to change the frequency and switching the frequency, so that we can reduce the spur effectively. A buck converter with spur reduction technique has been simulated in standard TSMC 0.18um process. The result is that, the system switching frequency spread from 650KHZ to 1.295MHZ with a frequency step 43KHZ between 16 switching frequency, and the changing rate is 15.25KHZ. It also can regulate output voltage of 1.2V when load current change from 50mA to 500mA, and maximum magnitude of spur reduction can achieve 27dB.
Mokwatlo, Peter Noko. "Patient satisfaction in breast reduction using the medal pedicle technique versus the inferior pedicle technique". Thesis, 2018. https://hdl.handle.net/10539/29127.
Texto completoBackground: Breast reduction surgery is an accepted and commonly performed procedure for addressing gigantomastia for cosmetic and functional purposes. It has been proven to have a high rate of patient satisfaction. It is a functional operation, improving quality of life in symptomatic patients. Aims: This study evaluated patients’ satisfaction in subjects who had undergone breast reduction surgery between June 2017 and June 2018 at Chris Hani Baragwanath Academic Hospital (CHBAH), Helen Joseph Academic Hospital (HJAH) and Netcare Rand Clinic, using the medial pedicle technique versus the inferior pedicle technique. Methods: Patient satisfaction was evaluated by assessing the following domains, satisfaction with breasts, satisfaction with nipples, satisfaction with outcome, psychosocial well-being, sexual well-being, physical well-being. The BREAST-Q questionnaire is a measuring tool employed to evaluate patient satisfaction secondary to breast reduction that meets international and federal standards. A total of 30 patients completed the BREAST-Q questionnaire in the clinics as they came for their follow-ups post-surgery. Fifteen participants had undergone breast reduction through the medial pedicle technique whilst the other 15 had had the procedure performed using the inferior pedicle technique. Results: The pedicles used were medial (n =15) and inferior (n =15). The findings were; breast satisfaction: medial pedicle technique 68.9 ± 17.6, inferior pedicle technique 69.6 ± 18.7 with a p-value of 0.926. Physical wellbeing: medial pedicle technique 62.7 ± 19.6, inferior pedicle technique 84.2 ± 14.2 with a p-value of 0.002. The two techniques performed equally on average and in all the domains except in the physical wellbeing domain where the inferior pedicle technique had a statistically significant superiority to the medial pedicle technique. Conclusions: The use of different techniques in breast reduction will continue. Through the use of tools like the BREAST-Q questionnaire in patient related outcome measurements, we will gain a window into the patients’ feeling about the different techniques and in the process learn or change to techniques that offer better patient satisfaction. The resected breast tissue should have been weighed at the time of operation. Symptom relief is based on the volume of tissue resected.
MT 2020
Hsieh, Ching-Ming y 謝志明. "The Application of Microbubble Drag Reduction Technique on ship Model". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/39723177743908830237.
Texto completo國立臺灣大學
工程科學與海洋工程學系
92
Abstract How to reduce the drag and raise the efficiency of ship is one of the most important research topics of ship hydrodynamics. The studies conducted on the flat plate showed that the drag reduction could be achieved by the injection of microbubbles into the turbulent boundary layer of the flat plate. The 70% to 80% drag reductions were reported. The microbubble drag reduction technique is applied to ship model in this study. The mechanism of micrbubble drag injection is installed on the bottom of a ship model to reduce the resistance of the ship model. The effects of drag reduction depend on the location of microbubble injection, diameter of the porous material and the velocity of model as shown from the tested results. The better drag reduction was found for the 100 micro meter diameter of the porous material and the injection of microbubble at rear part of the model only. The 18% frictional drag reduction is the best one in this study. Thus the drag reduction of microbubble injection method is validated on the ship model.
Liang, Li Huang y 梁立煌. "Multi-channel noise reduction technique from the inverse reconstruction perspective". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9ucmuh.
Texto completo國立清華大學
動力機械工程學系
105
In this thesis, a noise reduction algorithms is presented from the perspective of source localization and separation. Minimum Power Distortionless Response (MPDR) algorithm is utilized to determine the bearings of the signal and noise sources. Tikhonov regularization (TIKR) and compressive sensing (CS) algorithm are employed to extract the amplitudes of the signal and noise sources. In order to evaluate the proposed method, the log minimum mean-square error (log-MMSE) algorithm, the Generalized Sidelobe Canceller (GSC), and the regulated multiple-input/output inverse theorem (R-MINT) are adopted as benchmarking methods. The Log-MMSE is used to estimate an optimize gain correction function as a post-filter. To enhance GSC, subband (SB) filtering and internal iteration (IIT) are incorporated, which is termed the GSC-SB-IIT method. The R-MINT used to be applied in room response inverse filtering. Numerical simulations and experiments are conducted for a 24-channel uniform circular microphone array. White noise and traffic noise are used in simulating the background noise. Objective tests based on the segmental signal-to-noise ratio (segSNR) and Perceptual Evaluation of Speech Quality (PESQ) and subjective listening tests are conducted to compare the noise reduction approaches. The results show that the CS algorithm has achieved the highest reduction of noise.
CAI, FENG-ZHOU y 蔡豐洲. "A pipeline bubbles reduction technique for the Monsoon dataflow architecture". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/32228626885367156032.
Texto completoLin, Wen-xiang y 林文祥. "Modified Selective Mapping Technique for PAPR Reduction in OFDM Systems". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/17986805567975920926.
Texto completo國立中央大學
通訊工程研究所
100
Orthogonal frequency division multiplexing (OFDM) is desirable technique of wireless communication. Subcarriers of OFDM signal are orthogonally used on the frequency spectrum, and can resist multipath effect characteristics. Recently, OFDM has been used widely in many kinds of communication standards. But the OFDM signal has a major disadvantage is high peak-to-average power ratio (PAPR), which can resulted in significant nonlinear distortion when the signal is operated through a nonlinear region of power amplifier, and induces the degradation of bit error rate (BER). The methods of PAPR reduction, selective mapping (SLM) is effective and uncomplicated. SLM is a linear operation, it doesn’t destroyed the signal itself. The received signal can be demodulated perfectly at receiver. But SLM has a problem of the high computational complexity, in this paper, introduce a modified SLM. The technique uses the concept of partition into subcarriers, called a partial-sequence SLM (P-SLM), which considerably reduces the computational complexity with the similar performance of PAPR reduction compared with the conventional SLM scheme. The simulation results show that it achieves better performance of reduces the computational complexity than the conventional SLM scheme.
Lin, Ya-Min y 林亞民. "A Circuit Design for Dynamic Power Reduction Using Transparent Technique". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/94888141609221554787.
Texto completo國立彰化師範大學
資訊工程學系
100
This paper presents a pipeline structure based on clock-gating technique which can save dynamic power consumption. This structure fully uses transparent technique, and makes the registers of the intermediate stages into transparent mode dynamically to reduce dynamic power consumption of switching signal state. The proposed structure based on two circuits, one is interlock pipeline and the other is elastic circuit. These two circuits are similar to asynchronous characteristics, and make it having good performance of low power. The main design purpose of interlock pipeline is simulating asynchronous circuit to have the advantages of asynchronous. One of asynchronous advantages is locality, it means the stages work locality without affecting whole circuit work. According to the foregoing, signal also switches locality and decrease the dynamic power consumption. Elastic circuit works similarly to interlock pipeline, the main difference between them is the control logic. There is one more control logic to control the valid latches in interlock pipeline, but in elastic circuit, there is no control logic in elastic circuit but using clock signal directly. Finally, according to clock gating、transparent technique and locality, we implement two pipeline structures which can save dynamic power consumption and have the characteristic of asynchronous circuit, and compare these two structures at last of paper.
Ju, Wei-Zu y 朱韋儒. "An Efficient SLM Technique for PAPR Reduction of OFDM Signals". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97745398874734266705.
Texto completo國立高雄第一科技大學
電腦與通訊工程研究所
100
In wireless system, and time of technology, the system is required faster speed rate of transmission. Orthogonal frequency division multiplexing (OFDM) is a kind of multi-carrier modulation system. It is good for high data rate in orthogonal frequency channel, and it is effective to reduce multi-path fading on wireless channel. However, there is a main drawback in OFDM system, where the signal is higher peak-to-average power ratio (PAPR). The power amplifier (PA) needs larger linear range in order to avoid producing non-linear distortion which leads to increase bit error rate and spread outside band, but it will enlarge linear range of operation, and waste the efficiency of amplifier. To solve the PAPR problem in OFDM system. First we discuss the method of selective mapping to reduce high PAPR value, and there are a few issues associated with it. The issues include both side information and computation complexity. In this paper, a selected mapping (SLM) applied scheme using exhaust based dynamic programming (EDP) is proposed. In order to reduce the computation complexity of phase generation, using dynamic programing (DP) to obtain the last result of exhaust solution. Because the creation of phase sequences has a particular structure so the receiver can generate the phase sequences easy. This proposed method without transmitting side information greatly, thus improve the data rate and easy to realize.
張閔超. "A Novel Body-Effect Reduction Technique for Linear Charge pump". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82247319319787064658.
Texto completoYang, Chien-Po y 楊千柏. "Design Technique for Error Reduction On Automatic Segmentation In Microarray Image". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/00239591573186501581.
Texto completo國立中央大學
電機工程研究所
93
DNA Microarray hybridization is a popular high throughput technique in academic as well as in industrial genomics research. The Microarray image is considered as an important tool and powerful technology for large-scale gene sequence and gene expression analysis. There are many methods to analyze the Microarray image by automatic segmentation or gridding spot. These methods always have the same problem of noise and tilt in spot array. It is difficult to process strong noise image in automation. In this paper, we can reduce the error of the edge detection which is influenced by noise and tilt spot array. We apply an automatic segmentation usually application in video segmentation to process the Microarray image. We reduce the automatic spot segmentation errors and get more exact spot position. We only use low complexity methods and some simple concept by Microarray property. Using this property as two image scan in the same Microarray and spots are like array. Eventually, we compare the result with ScanAlyze tool because ScanAlyze tool extract spot position and edge by artificial interface. We obtain the 1.43% average differential value of spots analysis ratio in result with ScanAlyze. By the proposed method, we can get more accurate spot edge segmentation and lowest error in automatic analysis Microarray image.
Kuo-ChenChiang y 江國振. "Recovery and Reduction of Spent Metal Catalyst via Plasma Sintering Technique". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/46192475608883941499.
Texto completo國立成功大學
資源工程學系碩博士班
98
Plasma is a quasi-neutral gas consisting of a large amount of charged and neutral active species. These diverse active species with the high energy radiation capability of plasma can help to enhance the chemical reactions substantially and to make some reactions possible. As for gasification, it is commonly applied to convert coal, biomass, and waste materials to syngas and useful chemicals in industries. Supported metallic catalysts were widely used in industry for hydrogenation, hydrotreating, and steam-reforming reaction. The metallic catalysts was supported on the ceramic substrates (i.e., silica and alumina) to increase its surface area for achieving better catalytic efficiency. After multiple of catalytic reactions, the surface of metal-supported catalyst was completely covered with organic tar and loses its catalytic efficiency. This thesis is the recovery of metal and reduction of metal oxide of the spent catalyst in nitrogen medium under plasma conditions. The spent catalysts were sintered and organic wastes are converted to syngas in thermal plasma reactor. The gases evolved upon recovery of metal (Pt) and reduction of metal oxide (NiO2, Co3O4-MoO2) to metal are continuously pumped out the system and clarify the spent alumina-supported platinum catalyst. The results demonstrate that the thermal plasma treatment makes reduction of metal oxide to metal by single step thermal plasma processing. Key word: Oxidation catalyst;Alkali metal transition elements;Support carrier material;Plasma sinter;syngas;catalyst reduction
Lin, Chin-Yang y 林芷瑩. "Slope stability analysis under earthquake using the shear strengh reduction technique". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/76319134578648368980.
Texto completo國立成功大學
資源工程學系碩博士班
94
The object of this thesis is to investigate the stability of soil slope by using a numerical analysis procedure combining the deformation analysis and shear strength reduction technique, in which the stress-strain characteristic of the soil can be considered. The focus of this thesis is on the stability of soil slopes which are in the states of static and dynamic. It is important to find out the failure surface and the corresponding safety factor. It should be noticed that the critical slip surface is not unique. A narrow yielding zone was developed when the slope started to fail and any slip surface passing through the yielding zone could be the failure surface, and the corresponding safety factor was the SRF. The results of static analysis showed good agreements with limit equilibrium analysis. The plastic yield zone was developed from the toe to the top, and connected two free surfaces. To simulate the soil slope under earthquake, the acceleration histories in real time domain recorded at 921-earthquake was applied in the dynamic model. From the simulation results, the failure surface under seismic is deeper than static analysis. The shear failure zone increased with the peak ground acceleration increment, and the shear zone was started from the shallow position to the deeper zone.
Shu, Jaw-Shi y 徐炤旭. "Finite Element Analysis & Optimization on Springback Reduction -- "Double-Bend" Technique". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/06500075738329071197.
Texto completoKUO, CHIEH-HAN y 郭玠含. "An Output Ripple Reduction Technique For Switched-Capacitor Dc-Dc Converters". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02050213291278706967.
Texto completo國立中正大學
電機工程研究所
104
This thesis introduces a novel output ripple reduction technique for Switched-Capacitor DC-DC converter. The whole new algorithm is presented and the minimal output ripple is obtained by the decreased peak output ripple from adjusting the switch size and improvement of the lowest point of output ripple by increasing the switching frequency. In response to different loading current and output voltage, we according to the analyzing mechanism to automatically search the best size of switch. Under the premise that with no influence of efficiency, we apply the technique of phase interleaving to cut off the phase of current which provided by flying capacitor. Moreover, in the case of ultra-light load, we can turn off the superfluous flying capacitor, and then we can get the minimum output ripple. Using this algorithm makes the output ripple lower than 20mV efficaciously under all kinds of condition. Our technique can even more apply to any switched-capacitor converter. Based on Recursive SC topology, the 2:1 fundamental topology cascade to make the 2^N-1 kinds of ratio. In line with the demand of load modulate the best ratio to get higher conversion efficiency. When input voltage is 1.8v, we can provide output voltage at 0.1v~1.68v. And it has the very outstanding efficiency. Keywords: Switched-capacitor, dc-dc converter, ripple reduction technique, wide voltage range
Huang, Ying-Yin y 黃瀅瑛. "Trajectory Piecewise-linear Model Order Reduction Technique for Nonlinear Bistable Mechanism". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/13564381871769849441.
Texto completo臺灣大學
機械工程學研究所
95
In this work, we investigate the applications of the trajectory piecewise-linear model order reduction (TPWLMOR) technique on bistable mechanisms. The bistable mechanism, which is composed of a double curved-beam mechanism (DCBM), is employed in an MEMS (micro-electro-mechanical systems) optical switch. While applying an external force which is larger than a certain critical value, the DCBM quickly snaps through from a stable state to another stable state. We focused on analyzing the properties of the static and transient behaviors of the DCBM. First, we used the finite element method (FEM) software, ABAQUS, to construct a 3-D solid model of the DCBM and to simulate both the static and the transient analyses. Subsequently, we developed a 3-D dynamic nonlinear FEM numerical model. Then, the TPWLMOR is used to reduce the full-mesh FEM models into low-order models. The idea of TPWLMOR comes from the concept of piecewise-linear approximation and an Arnoldi-based model order reduction (MOR) algorithm. Reduced models are generated using the Arnoldi algorithm at appropriate linearization points, and then are superposed into a compact model (i.e., the trajectory piecewise-linear model) using weighted sum. Compared to traditional FEM modeling, the TPWLMOR models increases computational efficiency. The bistable device was realized using a simple SOI MEMS process with one photo-mask. Then we set up a Doppler laser interferometer system in order to measure the dynamics of the DCBM. We then compared the empirical data with the simulated dataset obtained by ABAQUS , FEM, and the TPWLMOR algorithm. The simulated DCBM displacements of the reduced models agree with the results of the ABAQUS, while the computational performance reaches 200 times of that of the ABAQUS. However, when the force is larger than the critical value, the DCBM does not snap-through as expected. The inaccurate results might be caused by many factors, which are subject to further study.
Chang, Yuan-Liang y 張元良. "A Study on Slope Stability Analysis Using Shear Strength Reduction Technique". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41279116386438620948.
Texto completo國立中興大學
土木工程學系
92
In the stability analysis of soil slopes, there are basically two deterministic approaches. The first is the limit equilibrium method (Bishop, 1955; Morgenstern and Price, 1965; Spencer, 1967; Janbu, 1973) and the second is stress-strain analysis (Brown and King, 1966; Dunlop and Duncan, 1970; Wright et al., 1973; Giam and Donald, 1988; Huang and Yamasaki, 1993; Zou et al., 1995). The limit equilibrium method is concerned with limit state analysis and has received wide acceptance because of its simplicity. However, this method has some theoretical shortcomings (Wright el al., 1973). With the advent of the finite element technique and powerful computers, given the material properties and the geometry of the slope, it is not difficult to analyze the soil slope for deformation and safety by computing the stress and strain in the slope using stress-strain analysis. The main advantages of the finite element approach to slope stability analysis over the traditional limit equilibrium method are that no assumption needs to be made in advance about slice side forces, or the location or shape of the slip surface. Failure occurs “naturally” through the zones within the soil slope in which the soil shear strength is unable to sustain the acting shear stresses (Wong, 1984). As for the attempt to convert the finite element analysis into a safety factor calculation, there are mainly two types of procedure. One is the consideration of stress level on the potential failure surface (Wright el al., 1973; Giam and Donald, 1988; Huang and Yamasaki, 1993). The other is the strength reduction technique (Zienkiewicz, et al. 1975; Donald and Giam, 1988; Ugai, 1989; Matsui and San, 1992; Griffiths and Lane, 1999; Manzari and Nour, 2000). In the former, a searching scheme as commonly adopted in the limit equilibrium method is needed to search for many slip surfaces through analysis of stress states. The safety factor is defined as the ratio of the sum of the shear strength available to the shear stress acting over the slip surface. The critical slip surface is the one corresponding to the minimum safety factor value. In a strict sense, the merits of this method over the traditional limit equilibrium method lie in the reliable estimation of stress states in the soil slope. In the strength reduction technique, the original shear strength parameters are divided in order to bring the slope to failure (Duncan, 1996). The evaluation of slope failure may use the bulging extended through the verge of instability localized in a narrow zone of the deformed shape (Donald and Giam, 1988) or non-convergence of the solution in a mathematical manner (Griffiths and Lane, 1999). Compared with the former method, only limited steps of analysis are needed to determine the critical slip surface and the corresponding safety factor using the strength reduction technique. However, the sharp bend of displacement in the instability region near the failure site may continue for several steps during the reduction process of shear strength for the existing procedure. There will be no perfectly delineated break-off point in the curve of displacement versus strength reduction factor (SRF) for determining the critical value of safety factor. In this study, an approach using the strength reduction technique of finite element analysis, with the provision of a failure criterion, and incorporation of graphical output, to examine the failure zone developed, was used in order to determine the slope failure and the corresponding safety factor. The state of the effective stresses in a slope is calculated by the finite element method using eight-node quadrilateral elements of elastic-plastic soil with the Drucker-Prager nonlinear stress-strain relationship and a nonassociated flow rule. The soil’s self-weight is modeled by a gravity “turn-on” procedure (Smith and Griffiths, 1988) with nodal loads added in a single increment. The shear strength of soil is estimated based on the Mohr-Coulomb failure criterion. Slope failure occurs when the yield zone spreads over the entire slip surface and the corresponding SRF is the safety factor of the soil slope. The slope failure could be clearly defined and progressive failure was also observed. It should be kept in mind that the critical slip surface is not unique. A narrow yielding zone was developed when the slope started to fail and any slip surface passing through the yield zone could be the failure surface. The factor of safety obtained by the proposed procedure is in good agreement with that determined by Bishop’s and Spencer’s methods. However, the proposed procedure can provide the designers a more solidly based concept in slope stability analysis.