• 대한전기학회논문지:전력기술부문A
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• 제48권9호
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• pp.1126-1130
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• 1999

This paper persents an algorithm compensating for the change of tension acting on a belt which is used as a force transfer media of the induction motor that drives a washing machine. The induction motor adopted in a washing machine is operated not only for the power-transmission device, but also for the detection of clothes load. The load of clothes is determined by the duration of inertial rotation which is occurred by the induction motor during a specific time. The tension of belt also affects the determination of clothes load as another load and this change of the tension is a significant disturbance for accurate determination. This paper mentions the algorithm compensating for the amount of change in tension and the application of the algotithm proved to be effectively increasing the washing performance and reducing the noise and the vibration.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.42-44
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• 2003

As the industry is developed, uses of various electric motor are increasing from general home to various fields of industry, and the kind becomes various daily. For these reasons, it is required to study the remote control and a package management about change of a speed drive system, the supervision of administration appliance by real time, and the collection and process data together using internet prevailed on industry whole. This paper deals with the development of a Web-Based remote control system for permanent magnet synchronous motor drives. The client/server system using TCP/IP protocols and DSP controller for remote control through internet and the Web interface that users can confirm data and state of PMSM(Permanent Magnet Synchronous Motor) is developed. This system is available for driving, braking, variable speed control and monitoring for PMSM in real time through administration program of Web-Based.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.457-461
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• 2001

Advantages of switched reluctance motor(SRM) drives make it an attractive candidate for replacing adjustable speed ac and dc drives in both industrial and consumer applications. Furthermore, a simple, low cost and robust SRM drive can be efficiently operated in the hostile environment of an automobile. Generally, the speed control of SRM has a large step change or large torque reference, the output of its PI controller is often saturated. When this happens, the integral state is not consistent with the SRM input, while may give rise to the windup phenomenon. This paper proposes anti-windup control method for SRM speed control system by hysteresis current controlled asymmetry bridge converter. The experimental results show that the speed response has much improved performance, such as a small overshoot and fast settling time at the acceleration and particulary deceleration period with braking mode.

• 대한기계학회논문집
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• 제12권3호
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• pp.457-465
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• 1988

본 연구에서는 벨트 연삭시 즉 집중하중을 받는 평벨트 구동에서 벨트와 풀리 사이의 내접촉 특성을 구하고자 하였다.준 정적평형(quasi-static equilibrium) 상 태에서 벨트구동계의 이론적 해석을 하여 집중하중점을 포함한 벨트-풀리 전접촉구간 에서 벨트장력분포를 구하고 이 결과를 실험치와 비교하였다. 본 연구에서는 집중하 중점 보다는, 집중하중의 벨트-풀리 전접촉구간에 대한 영향을 밝히는데 주안점을 두 었다.

• 전기전자학회논문지
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• 제22권4호
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• pp.1031-1035
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• 2018

본 논문은 저속 운전을 포함한 영구자속의 자속 추정을 통하여 Permanent Magnet Synchronous Motor(PMSM)의 토크 오차를 보상하는 기법에 대해 기술한다. 영구자속의 자속은 온도에 따라 변화한다. 동손을 최소화하기 위해 적용되는 Maximum Torque per Ampere (MTPA)는 영구자속의 자속 추정값을 이용하여 구현되기 때문에 영구자석의 자속이 변화할 경우, 토크 오차가 발생한다. 본 논문에서는 쇄교자속관측기를 이용하여 영구자석의 자속을 실시간으로 추정하여 제어알고리즘에 적용함으로써 토크 오차를 보상하는 기법을 제안한다. 제안된 기법은 시뮬레이션과 실험을 통하여 검증하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.355-360
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• 2000

There are many changed while a design is completed. Therefore, if the impact of the design changes is estimated, it may result in the improvement of design efficiency. But, the design changes have various types and affect other parts of the design system. Hence, it is difficult to deal with design changes directly. The purpose of this research is to develop a systematic change propagation tracing algorithm and a method of change impact analysis and then, to implement a change impact analysis system. Process based design is set up for the field of this research. Also the design, composed of design parameters and constraints, is set up for the subject of the research. Change propagation tracing algorithm traces change propagation based on the following concept : If the design parameters are changed, other parameters within the constrains including them may be changed. Using the result of change propagation tracing algorithm, changeable parameters, constraints and tasks can be found. The method of change impact analysis, to calculate change impact value from this changeable tasks, is developed. Change propagation tracing algorithm and the method of change impact analysis are implemented into change impact analysis system and it is applied to the redesign of 2 stage gear drives. It can support different kinds of design activities systematically. especially, at the redesign step, where many design change alternatives exist, change impact value of each alternative exist, change impact value of each alternative is calculated and design change is performed toward direction to minimize the impact of design change. Consequently, it is expected to improve the efficiency of the whole design.

• 농촌계획
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• 제10권1호
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• pp.41-55
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• 2004

The purpose of this study is to investigate a causal relationship between the mode of production and change of rural society. While dominant theories of social change have stressed variation of contingencies and periodical contexts, this theoretical paper drives a new insight paralleling diverse theoretical arguments of each mode of production with rural and urban changes. Investigating the drifts of intellectual ideologies of the mode of production, we get through diverse paradigm shifts of the production accumulation and its trigger effects on rural change. More specifically, the present study investigates change of rural society by way of investigating such fluctuations of societal changes as ancient society, slavery society, feudal society, industrial society, post-industrial society, and information society. We find that transportation and communication technologies have had a key role in the changes, however, the effects of the technologies on social changes have been different between rural- and urban-society. While we take it for granted that flexible accumulation in post-industrial society and time-space compression and informatization in information society will reduce developmental gap between rural- and urban-society, we also found that there have been big differences of actual application of the technologies between theory and reality in each era of mode of production.

• 문화기술의 융합
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• 제4권3호
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• pp.7-13
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• 2018

신동일 감독은 한국 영화계에서 작가적 고집으로 자신만의 작품 세계를 지속적으로 추구하고 있는 작가 중 한명이다. 신동일 감독은 현대 사회의 시스템과 이데올로기, 그리고 병폐에 대해 비판하고 줄곧 그것에 대해 질문을 던져온 작가이다. 그가 <반두비> 이후 8년 만에 선보인 <컴, 투게더>(2017)는 전작들에서 추구했던 작품세계의 연장선상에 있으면서도 전작들과는 다른 변화를 보여주고 있는 작품이다. 본 논문은 신동일 감독이 추구하고 있는 작품세계를 크게 타자, 경계, 충동의 3가지로 나누어 전작들과 <컴, 투게더>의 공통점과 변화들을 비교하면서 분석한다. 그리고 그러한 분석을 통해 신동일 감독의 작품 세계를 고찰하고 변화 방향을 가늠한다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권4호
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• pp.151-155
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• 2001

The simple motor construction and low cost, fault tolerant power electronic drive has made the switched reluctance drive a strong contender for many applications. But the switched reluctance drive does exhibit higher levels of vibration and acoustic noise than that of most competing drives. The main source of vibration in the switched reluctance drive is generated by rapid change of radial magnetic force when phase current is extinguished during commutation action. In this paper, a hybrid excitation method is proposed to reduce vibration and acoustic noise of the switched reluctance drive. The hybrid excitation has 2-phase excitation by long dwell angle as well as conventional 1-phase excitation. The vibration and acoustic noise are reduced because the scheme reduces abrupt change of excitation level by distributed and balanced excitation.

• 한국실내디자인학회논문집
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• 제13권4호
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• pp.172-179
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• 2004

As the properties of living space and objects change in the digital era, furniture is also expected to change. This study starts from the question of such inclination that the digital innovation drives territories among products into the ambiguous, then tries to trace the variation of meaning against the furniture. Based on this possibility these functions, this research aims, to find out the digital functions which is preferred to be integrated with the furniture for the users of the residential space and the interface design aspects, which are considered important. preliminary survey using university students was done to extract the possible digital functions for convergence. The respondents were married women in their 20s and 30s who filled out the surveys on the internet. As a result, the specific digital convergence functions for both living and kitchen space were Identified. As major important expects for them were found functionality and controllability. Thus furniture design will expand to a concept which designs a new way of life.