직렬 아크 및 코로나 방전의 주파수 스펙트럼 분석

정광석(Kwang-Seok Jung),김선재(Sun-Jae Kim),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),서동환(Dong-Hoan Seo) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4

In this paper, we analyzed the frequency spectrum of radiated electromagnetic waves which is generated by series arc and corona discharges as a basic study to develop a online diagnostic technique for power facilities installed in a closed-switchboard. To simulate corona and series arc discharges, an arc generator specified in UL1699 and a corona generator were fabricated. The experiment was carried out in an electromagnetic shielding room, and the measurement system consists of a Ultra Log Antenna and a EMI Test Receiver. These results showed that the frequency spectrum of series arc and corona discharges exists in ranges from 30 to 500 [㎒], and the peak frequency of them were 40 [㎒], 80 [㎒], and 400 [㎒].

대면적 비접촉 스테이지에의 구동기 적용을 위한 선형유도기의 변형된 2축 벡터 제어기

정광석(Kwang-Suk Jung),이상헌(Sang-Heon Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.4

To effectively cope with a complexity of kinematic metrology due to workspace enlargement of the planar stage, the linear induction motor is suggested as its new driving source. Especially, the linear induction motor under uniform plate type of secondary doesn"t inherently have a periodical force ripple which is generally shown in the brushless DC motor. But, it presents a poor transient characteristic at zero or low speed zone owing to time delay of flux settling, resulting in slow response. To improve the servo property of linear induction motor and apply successfully it to the precision stage, this paper discusses a modified vector control methodology. The controller has a novel input form, fixed d-axis current, q-axis current and forward-fed DC current, to control thrust force and normal force of the linear induction motor independently. Influence of the newly introduced input and the feasibility of controller are validated experimentally.

유도형 축방향 모터의 6축력 제어를 이용한 대회전 구현용 통합 구동기

정광석(Kwang-Suk Jung),이상헌(Sang-Heon Lee) 제어로봇시스템학회 2006 제어·로봇·시스템학회 논문지 Vol.12 No.8

이중 동전기 휠에 의해 반송되는 도전성 환봉의 공간 안정성

정광석(Kwang Suk Jung) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.8

여행도·소매업간의 유통시스템 영향변수가 신뢰와 결속에 미치는 영향 연구

정광석(Kwang Suk Jung),이광선(Kwang Sun Lee),김종원(Chong Won Kim) 한국호텔관광학회 2001 호텔관광연구 Vol.3 No.3

The purpose of this is to focus on the relationship of trust and commitment between tour wholesaler and retail agent in the travel industry. In order to review the relationship of trust and commitment between tour wholesaler and retail agent, this study used the influence variables of travel distribution channels, such as retailer`s satisfaction to the tour wholesaler, the conveyance of useful information to the retailer`s, closer mutual communication with tour wholesaler, tour wholesaler reputation, and wholesaler opportunism behavior, suggested in the proceed researches. It was conducted a questionaire survey of merchandisers from 47 travel retail agents in Seoul, Incheon and Suwon city. And the final sample of 110 retail agent merchandisers was attained. For empirical survey, the data was analysed by using Path Analysis. As a result of analysis retailer`s satisfaction to the tour wholesalers, the conveyance of useful information, closer mutual communication, tour wholesaler reputation were shown positively to the level of trust of the wholesalers and direct influence to the trust. But tour wholesaler opportunism behaviors were show negatively to the level of retailers. Also the trust level to the tour wholesalers was revealed positively to the level of commitment of the wholesalers and direct Influence to the commitment. Another result of the this study is that the conveyance of useful information, closer mutual communication, wholesaler reputation of travel distribution channels Influenced positively to the commitment between tour wholesaler and retail agent directly without passing through trust. In conclusion, the implication of this study indicates that the importance of wholesalers well managing with retailer agent, wholesaler good reputation to the retailers and customers, conveyance of useful information, impacts positively to the trust of retail agents.

레퍼런스 패턴 기반 면내 위치 측정 방법

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1

Generally, in-plane position of moving object is measured referring to the reference pattern attached to the object. From optical camera to magnetic reluctance probe, there are many ways detecting a variation of the periodical pattern. In this paper, the various operating principles developed for in-plane positioning are reviewed and compared each other. And, a novel method measuring large rotation as well as x, y linear displacements is suggested, including a detailed description of the overall system layout. It is a modified version of the surface encoder, which is a robust digital measuring method. From the surface encoder, the rotation of an object is measured indirectly through a compensated input of optical servo and independently of linear displacements. So, the operating range can be extended simply by enlarging the reference pattern, without magnifying the decoding units.

마그네트 기반 감속기의 민감도 해석

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.2

Magnet gear transfers a high speed torque of the driving side to a low speed following side. Of course, the torque is amplified as much as a ratio between pole number of magnet gears constituting both sides through ferromagnet modulator. However, the parameters of the overall magnetic system influence the transmitting torque strongly. They include a pole number of permanent magnet, magnet thickness, reducing ratio, harmonic modulator thickness, and open ratio etc. In this paper, the influences of the parameters are analyzed using finite element method tool. By comparison, a desirable design specification is proposed, including a recommended modulator pattern.

비접촉 동력 전달을 위한 마그네트 기어 기반 감속기의 속도 제어에 관한 연구

정광석(Kwang Suk Jung) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.7

마그네트 기어를 이용하면 기계적인 접촉없이 동력을 전달할 수 있다. 마그네트 기어 기반 감속 시스템에서 종동축은 구동축으로부터 분리되어있기 때문에 시스템은 제한된 공극 강성으로 부하 변화에 대응해야하는 2관성 공진 시스템이다. 종동축 즉, 저속측은 구동축 인가 토크만으로 제어되고 갑작스런 외란에 따라 일반적인 기계식 기어 시스템과 달리 과도한 진동이나 슬립이 발생할 수 있다. 따라서 저속측에 인가되는 부하 등의 외란은 실시간으로 측정되거나 추정되어야 한다. 본 논문에서는 고조파 조절기 일체형 마그네트 기어를 이용한 감속 시스템의 저속측 속도 제어를 위한 전상태 되먹임 제어기를 제안하고 이를 전산 모의 시험과 실험을 통해 검증하였다. 저속측 부하를 추정하기 위해 새로운 상태변수를 도입하여 관측기 를 설계하였으며 이를 기반으로 하는 전상태 제어기를 통한 외란에 대한 강건성은 2자유도 PI 속도 제어기와 비교하였다. 상대적으로 짧은 시간안에 극의 슬립이 보정되는 것을 확인하였으며 추정된 변수는 실제 측정 결과와 유사한 경향을 나타내 었다. 이러한 결과는 마그네트 기어 감속기의 서보 시스템으로의 응용 가능성을 담보해주는 결과인 것으로 판단된다. Using the magnet gear, it is possible to transmit power without mechanical contact. As the drive shaft in a magnet gear-based speed reducer system is isolated from the drive shaft, the system is a two-inertia resonance system that should cope with an external load with the limited air-gap stiffness. On the other hand, the drive shaft or low-speed side is controlled only by the torque of the drive shaft through an air-gap, and the excessive oscillation or the slip can then be generated because of an abrupt disturbance that is different from the general mechanical gear system. Therefore, the disturbance loaded at the low speed side should be measured or estimated, and considered in the control of the driving shaft. This paper proposes a novel full-state feedback controller with a reduced-order observer for the speed reducer system using a magnet gear with a unified harmonic modulator. The control method was verified by simulation and experiment. To estimate the load at the low speed side, a novel observer was designed, in which the new state variable is introduced and the new state equation is formulated. Using a full-state feedback controller including the observer, the test result against disturbance was compared with two D.O.F PI speed controllers. The pole slip was compensated within relatively a short time, and the simulation result about the estimated variable shows a similar tendency to the test result. The test results showed that the magnet gear-based reducer can be applied to an accurate servo system.

인덕션 방식을 이용한 평면 스테이지의 동특성 개선

정광석(Kwang-Suk Jung),박준규(Jun-Kyu Park),김효준(Hyo-Jun Kim) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.7

Instead of direct driving like BLDC, the induction principle is adopted as a driving one for planar stage. The stage composed of four linear induction motors put in square type is activated by two-axial forces; low-frequency attractive force and thrust force of the linear induction motors. Here, the modified vector control whose new inputs are q-axis current and de current biased to three phase current instead of d-axis current or flux current is applied extensively to overall motion of the stage. For the developed system, the precision step test and the constant velocity test are tried to guarantee its feasibility for TFT-LCD pattern inspection. However, to exclude a discontinuity due to phase shift and minimize a force ripple synchronized with the command frequency, the initial system is revised to the antagonistic structure over the full degree of freedom. Concretely describing, the porous air bearings guide an air-gapping of the stage up and down and a pair of liner induction motors instead of single motor are activated in the opposite direction each other. The performances of the above systems are compared from trapezoid tracking test and sinusoidal test.

비접촉 이송 시스템의 구동원으로서 동전기 휠의 응용

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.2

The rotating electrodynamic wheels can produce three-axial forces on the conductive target. The forces are linked strongly each other, and their magnitudes depend on the rotating speed of the wheel. However, the wheels can be used effectively as an actuating principle for transfer system of conductive material. The conductive material is a pipe with a constant cross-section or a conductive plate. In this paper, a few applications using the electrodynamic wheels as transferring means are introduced including the full description of the real hardware implementation.