• Title/Summary/Keyword: Switching process

Search Result 795, Processing Time 0.048 seconds

LAT System for Fault Tree Generation (PLC로 제어되는 기계에서 Fault Tree를 효과적으로 생성하기 위한 LAT(Ladder Analysis Tool)개발)

  • 김선호;김동훈;김도연;한기상;김주한
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1997.10a
    • /
    • pp.442-445
    • /
    • 1997
  • A challenging activity in the manufacturing industry is to perform in real time the continuous monitoring of the process state, the situation assessment and identification of the problem on line and diagnosis of the cause and importance of the problem if he process does not work properly. This paper describes LAT(Ladder Analysis Tool) system for fault tree generation to improving the fault diagnosis of CNC machine tools. The system consists of 4 steps which can automatically ladder analysis from ladder diagram to two diagnosis function models. The two diagnostic models based on he ladder diagram is switching function model and step switching function model. This system tries to overcome diagnosis deficiencies present machine tool.

  • PDF

Investigations of process factors in the sensitivity of embedded digital switching TSP

  • Han, Sang-Youn;Oh, Keun-Chan;Seong, Dong-Gi;Ham, Yeon-Sik;Lyu, Jae-Jin;Cho, Young-Je
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.1531-1534
    • /
    • 2009
  • Effect of process factors on the sensitivity of inner-type digital switching TSP was analyzed. From these results, we have successfully fabricated inner-type digital switching TSP embedded in 3.2-inch WQVGA PLS mode LCD panel. During many factors, TFT sensor structure for reducing the PI thickness and a separation distance of $0.3{\mu}m$ between the conductive column spacer (C/S) and TFT sensor were essential. Glass thickness and main C/S density were also important factors. This technology can be applied to wide angle of view hand-held phones, personal digital assistants (PDAs), and tablet PCs.

  • PDF

Switching Losses Analysis of the Interleaved ZCT DC-DC Converter with Current Conduction Modes (전류전도모드에 따른 Interleaved ZCT DC-DC Converter의 스위칭 손실 분석)

  • Cha, Dae-Joong;Baek, Ji-Eun;Ko, Kwang-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.1
    • /
    • pp.80-85
    • /
    • 2015
  • In the issues of interleaved topology which have been in limelight as high power converter, various soft-switching methods are studied to reduce switching losses in high power application. The interleaved ZCT converter has an additional filter inductor to reduce losses of diodes during reverse recovery process. However, additional current conduction modes are occurred by the inductor, we need to analyze switching losses with inductor values on each mode. In this paper, current conduction modes and boundary conditions of interleaved ZCT converter are analyzed. In the conclusion, the minimum of switching losses in converter operation modes is analyzed by calculating switching losses.

A Comparison Study of Bayesian Methods for a Threshold Autoregressive Model with Regime-Switching (국면전환 임계 자기회귀 분석을 위한 베이지안 방법 비교연구)

  • Roh, Taeyoung;Jo, Seongil;Lee, Ryounghwa
    • The Korean Journal of Applied Statistics
    • /
    • v.27 no.6
    • /
    • pp.1049-1068
    • /
    • 2014
  • Autoregressive models are used to analyze an univariate time series data; however, these methods can be inappropriate when a structural break appears in a time series since they assume that a trend is consistent. Threshold autoregressive models (popular regime-switching models) have been proposed to address this problem. Recently, the models have been extended to two regime-switching models with delay parameter. We discuss two regime-switching threshold autoregressive models from a Bayesian point of view. For a Bayesian analysis, we consider a parametric threshold autoregressive model and a nonparametric threshold autoregressive model using Dirichlet process prior. The posterior distributions are derived and the posterior inferences is performed via Markov chain Monte Carlo method and based on two Bayesian threshold autoregressive models. We present a simulation study to compare the performance of the models. We also apply models to gross domestic product data of U.S.A and South Korea.

Implement of Constant-Frequency-Controled Zero-Voltage-Switching Converter-fed DC Motor Drive for Low Power Loss (직류 전동기의 저손실 구동을 위한 일정 주파수 제어형 영전압 스위칭 변환기의 구현)

  • Ko, Moon-Ju;Park, Jin-Hong;Han, Wan-Ok;Lee, Sung-Paik
    • Proceedings of the KIEE Conference
    • /
    • 1998.07f
    • /
    • pp.2148-2150
    • /
    • 1998
  • This paper proposes a constant frequency controlled zero voltage switching method that can reduce switching losses caused by emf on inductance in DC motor. The zero voltage switching method is used more than a zero current switching method because of reducing switching losses by capacitance of depletion region of MOSFET. To simplify the controller circuit, we propose constant frequency controlled zero voltage switching method in the paper. The control method is more stable than a variable frequency control method because it can optimize bandwidth of a closed-loop and reactances. Therefore, we construct a constant frequency controlled zero voltage switching converter and improve zero switching losses in high switching frequency. In the process, we can control low-losses in full range on variable voltage and load. We simulate the proposed converter with P-SPICE and compare results obtained through the experiment.

  • PDF

A Study on the Effect of Mediating Roles on Attractiveness of Alternatives on the Relationship between the Quality of Beauty Service and the Service Loyalty (미용서비스품질과 서비스충성도간 관계에서 대안매력도의 조절효과)

  • Lee, You Mi;Rhee, Nan Hee
    • Journal of Fashion Business
    • /
    • v.20 no.1
    • /
    • pp.173-190
    • /
    • 2016
  • The purpose of this study was to investigate the mediating roles of relationship quality, satisfaction and trust, and switching cost during the process of the effects of service quality in the beauty industry. Assuming the attractiveness of alternatives of such structural relations may differ between paths of groups, effects of influence on the relation of each composition concept were investigated. This study adopted a three-dimensional model of service quality, "process quality", "outcome quality", and "environment quality." Amos was used to analyze the research hypotheses and the proposed model. The result of the study suggests that service quality positively influences relationship quality, and relationship quality yields service loyalty. The results also indicates that relationship quality positively influences switching cost and switching cost positively influences service loyalty. Each service quality dimension had a significant effect on satisfaction, trust, and the relative importance of service quality dimensions on satisfaction; trust followed the order of process quality, outcome quality, and environment quality. The moderating variable such as the alternatives' attractiveness is found to be important moderators of the path of the model.

Design and Fabrication of Test Equipment for mass production of Automatic Test Equipment(ATE)

  • Kim, Dong-Il;Choi, Kyung-Jin
    • Journal of the Korea Society of Computer and Information
    • /
    • v.22 no.8
    • /
    • pp.1-7
    • /
    • 2017
  • In this paper, we proposed the test equipment that can perform separate performance tests to mass-produce the Automatic Test Equipment. Until now, the performance test of the ATE has been performed after it has been assembled perfectly. It is possible to perform the performance test only when the external device manufacturing and setting of measurement resources and the internal wiring work have been completed. So we have been studying test equipment that separately tested the switching devices that played a key role in the performance of the ATE. To build the test equipment, we reviewed the circuit card assemblies that make up the switching devices. We designed a test equipment that satisfies the performance test and apply the completed test equipment to the actual production process to analyze whether it was effective in improving the time and workability of the performance test. The test equipment has the advantage that it can be used universally in the mass production process of ATE with the same type of switching device.

Impulse Noise Removal using Switching Mean Filter (스위칭 평균 필터를 이용한 임펄스 잡음 제거)

  • Kim, Kuk-Seung;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2009.10a
    • /
    • pp.477-481
    • /
    • 2009
  • In this paper the process of transmitting images signal restore to image corrupted by impulse noise proposed switching mean filter. these filter is differential size using the two state noise detection distinguishes noise pixel and noise free pixel. Follow the detected impulse noise density in the image remove the impulse noise using switching mean filter these substituted pixel in order to non-recursive and recursive form from control process of the next pixel comes to be used with neighbor pixel process. Through the simulation, we compared with the existing methods and capabilties.

  • PDF

The Effects of Internet Fashion Consumer's Anticipated Regret and Selection Difficulty on Decision Making Delay and Purchase Switching Intention (인터넷 패션 소비자의 예상된 후회와 선택의 어려움이 구매결정연기 및 구매전환의도에 미치는 영향)

  • Lee, Eun-Jin
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.37 no.4
    • /
    • pp.526-539
    • /
    • 2013
  • This study analyzed the effects of internet fashion consumer's anticipated regret and the selection difficulty on decision making delay and purchase switching intention. The survey was conducted in 2012 on internet fashion consumers in their 20s to 40s from May 1 to June 30; subsequently, 487 responses were used for the data analysis. The anticipated regret of internet fashion consumers was composed of product, service, social psychology, and function-related anticipated regret. The selection difficulty of internet fashion consumers was composed of process, information, and experience-related selection difficulty. There are significant differences in anticipated regret, selection difficulty, decision making delay, and purchase switching intention by gender. The anticipated regret (product, service, and social psychology-related anticipated regret) and selection difficulty effected decision making delay. In addition, the anticipated regret for product and selection difficulty by process or information influenced purchase switching intention. The results of this study provide useful information on the success and efficient operation of internet shopping malls.

Effect of Domain Switching on Crack Growth in Ferroelectric Ceramics (분역회전이 강유전체 세라믹내의 균열성장에 미치는 영향)

  • 정경문;박재연;범현규
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.20 no.11
    • /
    • pp.142-149
    • /
    • 2003
  • Domain switching effect on crack growth in ferroelectric ceramics under combined electric and mechanical loading is investigated. The shape and size of the switching zone is shown to depend strongly on the relative magnitude between the applied electric field and stress field as well as on the ratio of the coercive electric field to the yield electric field. The toughening mechanism is thought to be ferroelectric domain switching leading to the development of a process zone around the crack. Crack-tip stress intensity factor induced by domain switching for the steady state crack growth is numerically obtained.