• Title/Summary/Keyword: industrial linkage

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Reduction of Torque Ripple of PMSM Using Iterative Flux Estimation

  • Lee D. H.;Kim C. H.;Kwon Y. A.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.346-350
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    • 2001
  • PMSM drives are widely used in the industrial and residential applications because of high efficiency, high power density and high performance. For better performance of PMSM, however, torque ripples should be reduced. This paper investigates a reduction of torque ripple due to the unsinusoidal flux linkage produced by the shapes of stator slot and magnetic pole. To minimize torque ripple, a simple flux estimator is proposed. This method interatively compensates the distributed flux linkage from an error between the measured and estimated currents. The proposed algorithm is verified through simulation.

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Shock Absorbing Safe Mechanism Based on Transmission Angle of a 4-bar Linkage (4절링크의 전달각에 기초한 충격흡수식 안전 메커니즘)

  • 박정준;김병상;송재복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.180-185
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    • 2004
  • Unlike industrial manipulators, the manipulators mounted on the service robots are interacting with humans in various aspects. Therefore, safety has been the important design issue. Many compliant robot arm designs have been introduced for safety. It is known that passive compliance method has faster response and higher reliability than active ones. In this paper, a new safe mechanism based on passive compliance has been proposed. Passive mechanical elements, specifically transmission angle of the 4-bar linkage, springs and shock absorbing modules are incorporated into this safe mechanism. This mechanism works only when the robot arm exerts contact force much more than the human pain tolerance. Validity of the safe mechanism is verified by simulations and experiments. In this research, it is shown that the manipulator using this mechanism provides higher performance and safety than those using other passive compliance mechanisms.

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A Study on the Effect of Job Embeddedness on Organizational Citizenship Behavior and Job Performance (직무 임베디드니스가 조직시민행동과 직무성과에 미치는 영향에 관한 연구)

  • Lee, Sun-Kyu;Lee, Ung-Hee
    • Journal of Digital Convergence
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    • v.6 no.2
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    • pp.107-115
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    • 2008
  • This paper aims to examine the main factors of the job embeddedness on organizational citizenship behavior and job performance. To accomplish these purposes, the main factors of the job embeddedness such as fit, linkage, and sacrifice were found from the previous studies. The questionaries of 250 were distributed to the employees working at the Gumi Industrial Complex. The questionaries of 220 were obtained and 204 were analyzed through frequencies, correlation and multiple regression. The results of this study are as follows; First, we conducted exploratory factor analysis for three constructs (fit, linkage, and sacrifice) using oblique rotation method that did not assume independence among the factors and main factors of job embeddedness were grouped together by three factors. Second, it is shown that three main factors of job embeddedness have a positive influence on the organizational citizenship behavior and job performance (p<0.05). This study, however, have limitations of number of sample and survey area. The future study should consider these limitations in improving model applicability in practice.

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Reduction of Torque Ripple of Permanent Magnet Synchronous Motor (영구자석 동기전동기의 토크 리플 저감 운전)

  • Lee, D.H.;Lee, J.H.;Kim, Y.S.;Kim, J.H.;Kwon, Y.A.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.918-920
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    • 2001
  • PMSM drives are widely used in industrial and residential applications because of high efficiency, high power density and high performance. For better performance of PMSM, however, torque ripples should be reduced. This paper investigates a reduction of torque ripple due to the unsinusoidal flux linkage produced by the shapes of stator slot and magnetic pole. To minimize torque ripple, a simple flux estimator is proposed. This method iteratively compensates the distributed flux linkage from an error between the measured and estimated currents. The proposed algorithm is verified through simulation.

  • PDF

A study on the effect of job embeddedness on organizational citizenship behavior and job performance (직무 임베디드니스가 조직시민행동과 직무성과에 미치는 영향에 관한 연구)

  • Lee, Seon-Gyu;Lee, Ung-Hui
    • 한국디지털정책학회:학술대회논문집
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    • 2006.06a
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    • pp.77-86
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    • 2006
  • This paper aims to examine the main factors of the job embeddedness on organizational citizenship behavior and job performance. To accomplish these purposes, the main factors of the job embeddedness such as fit, linkage, and sacrifice were found from the previous studies. The questionaries of 250 were distributed to the employees working at the Gumi Industrial Complex. The questionaries of 220 were obtained and 202 were analyzed through frequencies, correlation and multiple regression. The results of this study are as followings; First, we conducted exploratory factor analysis for three constructs (fit, linkage, and sacrifice) using oblique rotation method that did not assume independence among the factors and main factors of job embeddedness were grouped together by three factors. Second, it is shown that three main factors of job embeddedness have a positive influence on the organizational citizenship behavior and job performance (p<0.05). This study, however, have limitations of number of sample and survey area. The future study should consider these limitations in improving model applicability in practice.

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Synthesis and Photocharacteristics of Bismaleimide Containing Ester Linkage (Ester Linkage를 함유한 Bismaleimide의 합성과 감광특성)

  • Kim, Sang-Min;Kim, Tae-Ho
    • Applied Chemistry for Engineering
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    • v.8 no.2
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    • pp.147-153
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    • 1997
  • Bismaleimides(BISMI) containing ester linkages were prepared by the chlorinated N-(p-carboxyphenyl)maleimide and N-(p-hydroxyphenyl)maleimide. The photosensitive properties of BISMI were investigated via changes of the irradiation time. Benzil dimethyl ketal was used as a photoinitiator. The effect of photoinitiator onto BISMI increase in average as increasing photoinitiator concentration and irradiation time. The yield of residual film and image pattern and resolution also measured and discussed.

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Shock-Absorbing Safety Mechanism Based on Transmission Angle of a 4-Bar Linkage (4절링크의 전달각에 기초한 충격흡수식 안전기구)

  • Park, Jung-Jun;Kim, Byeong-Sang;Song, Jae-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.11 s.242
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    • pp.1534-1541
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    • 2005
  • Unlike industrial manipulators, the manipulators mounted on service robots are interacting with humans in various aspects. Therefore, safety has been one of the most important design issues. Many compliant robot arms have been introduced for safety. It is known that passive compliance method has faster response and higher reliability than active ones. In this paper, a new safety mechanism based on passive compliance is proposed. Passive mechanical elements, specifically transmission angle of the 4-bar linkage, springs and shock absorbing modules are incorporated into this safety mechanism. This mechanism works only when the robot arm exerts contact force much more than the human pain tolerance. Validity of this mechanism is verified by simulations and experiments. It is shown that the manipulator using this mechanism provides higher performance and safety than those using other passive compliance mechanisms or active methods.

The National Economic Effects of Four Power Generation Sectors: Using an Industrial Linkage Analysis (발전부문별 국민경제적 파급효과 분석 - 산업연관분석을 적용하여 -)

  • Kwa, Seung-Jun;Yoo, Seung-Hoon;Han, Sang-Yong
    • Environmental and Resource Economics Review
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    • v.11 no.4
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    • pp.581-608
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    • 2002
  • The electric power industry has played an important role in dramatic economic development in Korea and the electricity has constituted a critical factor sustaining the well-being of the Korean people. This study uses input-output analysis to investigate the role of four electric power sectors (hydroelectric, fossil-fuels, nuclear and non-utility) in the Korean national economy for the period 1985~1998, focusing on four topics: the impacts of electricity supply investments, the electricity supply shortage effects, and the impacts of the rise in electricity rates, and the inter-industry linkage effect. The overall results reveal that non-utility electric sector is superior in terms of the national economy-wide effects to other three sectors throughout the period. Finally, potential uses of the results are illustrated from the perspective of policy instruments and some policy implications are discussed.

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Proposal of Electronic Engineering Exploration Learning Operation Using Computing Thinking Ability

  • LEE, Seung-Woo;LEE, Sangwon
    • International Journal of Advanced Culture Technology
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    • v.9 no.4
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    • pp.110-117
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    • 2021
  • The purpose of the study is to develop effective teaching methods to strengthen the major learning capabilities of electronic engineering learners through inquiry learning using computing thinking ability. To this end, first, in the electronic engineering curriculum, we performed teaching-learning through an inquiry and learning model related to mathematics, probability, and statistics under the theme of various majors in electronic engineering, focusing on understanding computing thinking skills. Second, an efficient electronic engineering subject inquiry class operation using computing thinking ability was conducted, and electronic engineering-linked education contents based on the components of computer thinking were presented. Third, by conducting a case study on inquiry-style teaching using computing thinking skills in the electronic engineering curriculum, we identified the validity of the teaching method to strengthen major competency. In order to prepare for the 4th Industrial Revolution, by implementing mathematics, probability, statistics-related linkage, and convergence education to foster convergent talent, we tried to present effective electronic engineering major competency enhancement measures and cope with innovative technological changes.

Basic Research for Construction Standard Unit Price and BIM library Linkage (표준시장단가 및 BIM 라이브러리 연계 활용에 관한 기초연구)

  • Jin, Zheng-xun;Baek, Seung-Ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.251-252
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    • 2021
  • With the recent emergence of the 4th Industrial Revolution, the government is promoting the development of smart construction technology and institutional improvement through various policies to induce cutting-edge and technological innovation in the construction industry. As part of such smart construction technology, the application of BIM is being activated, and related regulations and guidelines are constantly being supplemented. In relation to BIM, there are many studies on the fields of library, design standards etc., but research on specific unit price utilization and unit price DB construction for calculating construction cost is insufficient. Therefore, in this study, a basic study was conducted on the linkage of the construction standard market unit price and the BIM library. Based on the basic research conducted in the future, we intend to establish specific standards for calculating BIM-based construction costs.

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