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조경재,정준호,이재수,Cho Kyeng-Jai,Jeong Jun-Ho,Lee Jae-Su 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.7
최근 정보통신의 흐름은 사용자의 다양한 정보 욕구를 만족시키기 위한 통신 서비스의 개발에 주력하고 있다. 근거리망의 통신에 광송신 모듈은 850nm, 1310nm의 파장대역을 사용하며, 광원의 구조는 LD를 사용하였지만, 장파장 및 Gbps급에서는 데이터 처리 능력이 뛰어난 수직공진형 표면발광 레이저(Vertical Cavity Surface Emitting Laser : VCSEL)을 많이 사용한다. 본 연구에서는 기본적인 광특성을 분석한 후 GHz급 이상에서 동작이 가능하도록 광전송 모듈을 개발하고 펄스 패턴 발생구를 이용하여 2.5GHz, 3GHz에서의 전송 특성을 분석하였다. The recent trend of information communication is to focus on improving communication services in order to satisfy the customer's desire for various information. Optical transducers of Local Area Network use 850nm or 1310nm among wavelength ranges and LD as a light source. However, Vertical Cavity Surface Emitting Laser(VCSEL) which is very excellent to deal with data processing is used at long wavelength or Gbps. In this paper, after basic optical characteristics were introduced a optical transmission module was developed to be operated over GHz and its transmission characteristics were analyzed at 2.5GHz and 3GHz with pulse pattern generator.
조경재(Kyeng-Jai Cho),차인수(In-Su Cha),이권현(Kwon-Hyun Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
We introduce the systematization design method using similarity theory which is profitable in the compatability, the reduction of construction time and price. The design method can make us predict the characteristic experiment for the magnitude we desire as the expression equation applied continuously, we can induce the design sample the users demand with the verification of the data on optimum design previously, Therefore, in case of designing and developing the. products, systematization design method is very useful for the standardization of the developed goods, compatability, the reduction of construction time and price. In this paper, we presented the analogical algorithms of systematization design using similarity theory, design factors and processing method of the restriction factors. Also, we analyzed the output voltage in terms of input voltage and displacement as choosing a differential transformer as the model.
조경재(Kyeng-Jai Cho),차인수(In-Su Cha),이권현(Kwon-Hyun Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
Linear induction motor made by cutting an induction motor toward the axis and by unfolding the stator and rotator is an apparatus which moves in a straight line without dynamic transformation devices such as gears and belts. Linear induction motor has been used widely for FA, OA, precise position control system and conveyance system, since the error by transformation devices doesn't occur.<br/> In this paper, with a linear induction motor (model 8228) of Lab-Volt company the characteristic of thrust was analyzed in terms of the input voltages
조경재(Kyeng-Jai Cho),차인수(In-Su Cha),이권현(Kwon-Hyun Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
Applying the magnetically levitated transportation system, which is noncontact bearing system, to solve the problems such as transformation of original form or flaw of iron plate caused by transportation of thin iron plate which required high quality as body of motor vehicle, materials of electronic devices etc.. Magnetic saturation phenomena caused by thickness of iron plate and gap size between magnets. In case of iron plate, the vibration mode will be considered since vibration occurs during transportation. In order to solve the problems caused by vibration, choose the levitation system method using numbers of magnet, magnetic saturation for thickness and length of iron plate with parameters in location and gap of magnet. In this paper, we will suggest the whole design technique of magnetically levitated transportation system, namely method of magnetic attraction and transportation system.<br/> <br/>
전자빔 조사에 의한 방향성 전기강판의 철손 감소를 위한 소형 전자빔 조사장치 설계
김민(Min Kim),조경재(Kyeng-jai Cho),차인수(In-Su Cha),조성오(Sung-Oh Cho),이종민(jong-Min Lee) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A nonconstact technique for reducing the core loss of a grain oriented silicon steel has been developed by the use of mechanical scribing, Q-switched laser, plasma jet or electron beam irradiation.<br/> Among these methods electron beam irradiation has advantages of domain refining without any deformation or damage of insulating film on the surface of a grain oriented SI- Fe.<br/> Over the past years, this processing was performed in vaccum of 10-4 Torr or below causing the problem of high cost and difficulty of continuous works.<br/> In this paper, a miniature electron permeable window through which electron beam energy 40-80keV and average current 0.1-2mA were obtained for electron beam Irradiating on air was designed and manufactured
이기재(Ki-Je Lee),윤석암(Suk-Am Yoon),윤형상(Hyung-Sang Yoon),조경재(Kyeng-Jai Cho),최장균(Jang-Kyun Chor),임중열(Jung-Yeol Lim),차인수(In-Su Cha),이경섭(Kyeng-Sub Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
This paper presents about EL(electroluminescent) driver with inverter. Inverter is composited two FET to increase safety output voltage. As result this study, the optimum operating condition of inverter is that the gate bias frequency of FET equal two resonant frequency of circuit. It shows to ideal sinusoidal output wave.<br/> Finally, EL sampler(l5cm x 15cm) gain 26 [lux] with lcm.