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Deduction of optimal conditions for acrylic etching technique by using CO2 laser
김희제,Keun-Ju Song,박성진,Hyun-Woong Seo,Ho-Sung Kim,Jin-Young Choi,Sung-Joon Park 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.1
Laser cuting with the micro-control technique has great potential to be employed for acrylicparameters such as laser power, moving velocity, and thickness of acrylic are experimented to find out optimal conditions. From these experimental results, we have known that it is very important to control accurate power by the TRIAC switching technique. The best condition of acrylic etching is performed 10 W and 72 mm/sec at the plastic thickness of 1.33 mm. The other case is performed 10 W and 48 mm/sec, and 12 W and 56 mm/sec at the acrylic thickness of 2.00mm, respectively. - Laser cuting with the micro-control technique has great potential to be employed for acrylicparameters such as laser power, moving velocity, and thickness of acrylic are experimented to find out optimal conditions. From these experimental results, we have known that it is very important to control accurate power by the TRIAC switching technique. The best condition of acrylic etching is performed 10 W and 72 mm/sec at the plastic thickness of 1.33 mm. The other case is performed 10 W and 48 mm/sec, and 12 W and 56 mm/sec at the acrylic thickness of 2.00mm, respectively.
김희제,이경준,Kim, Hee-Je,Lee, Kyung-Jun 선박안전기술공단 2011 선박안전 Vol.31 No.-
경제성장과 산업 사회생활의 고도화에 따라서 증대하는 전력수요에 대해서, 에너지자원량과 지구환경의 제약이 거론되고 있는 최근의 에너지를 둘러싼 심각한 상황인식을 고려하여 전력 수급의 장기적 안정을 확보하기 위해서는, 전력수급양면에 걸친 대책이 강화되어야 한다는 것이 현재 관련 전문가들의 공통된 의견으로 수렴되고 있다. 따라서 종래의 전력공급은 대규모 전원의 개발을 중심으로 수요에 대응해 왔지만, 앞으로는 수요의 관리 제어를 고려한 부하 관리(Load Management) 또는 수요측관리(Demand-Side Management)를 적극적으로 추진해가고, 나아가 다양한 에너지원의 효율적 활용을 목표로 한 분산형전원의 개발과 도입을 적극적으로 추진하는 등의 폭넓은 정책이 마련 시행될 필요가 있다. 그 대안중의 하나로 태양광 하이브리드 선박이 널리 보급될 경우 하나의 분산전원으로서 그 역할을 할 것으로 기대된다.
대면적 Ag 그리드 DSC 모듈을 활용한 AC 220V 상용 전원장치에 대한 연구
김희제(Kim, Hee-Je),서현웅(Seo, Hyun-Woong),김미정(Kim, Mi-Jeong),홍지태(Hong, Ji-Tae),심지영(Sim, Ji-Young),이상목(Lee, Sang-Mok),김호성(Kim, Ho-Sung) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The Solar energy is either used as a solar thermal energy or converted to electrical power through power conversion system. The latter method is defined as a solar cell changing the solar energy into the direct electric energy or power conversion that convert the dc power into ac power.For the solar cell to be a practical alternative energy, the study should be focused not only on the solar cell ,but also the power conversion system for common power source. In this study, we get the suitable power to common load ,using Ag Grid DSC(Dye-sensitized solar cell). Our purpose is to achieve the common solar cell power generation system ,using converter and PWM(Pulse width modulation) inverter system controled by DSP.
염료감응형 태양전지 광전극의 초음파 열처리를 통한 광전효율 개선에 관한 연구
金熙濟(Hee-Je Kim),金龍哲(Yong-Chul Kim),崔津英(Jin-Young Choi),金昊成(Ho-Sung Kim),李東吉(Dong-Gil Lee),洪知兌(Ji-Tae Hong) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
A making process of DSC(dye sensitized solar cell) was presented. In general, Photo electrodes of DSC was made by using colloid paste of nano TiO₂ and processing of Doctor-blade printing and high temperature sintering for porous structure. These methods lead to cracks on TiO₂ surface and ununiform of TiO₂ thickness. This phenomenon is one factor that makes low efficiency to cells. After TiO₂ printing on TCO glass, a physical vibration was adapted for reducing ununiform of TiO₂ thickness. And a thermal treatment at Low temperature(under 75℃) was adapted for reducing cracks on TiO₂ surface. In this paper, we have designed and manufactured an ultrasonic circuit (100W, frequency and duty variable) and a thermal equipment. Then, we have optimized forcing time, frequency and duty of ultrasonic irradiation and thermal heating for surface treatment of photo-electrode of DSC. In I-V characteristic test of DSC, ultrasonic and thermal treated DSC shows 19% improved its efficiency against monolithic DSC. And it shows stability of light-harvesting from drastically change of light irradiation test.
새로운 전처치법과 초대량의 CD34 양성 조혈모세포를 이용한 고 위험군 급성 골수성 백혈병 환자의 가족간 HLA 완전 일배체 불일치 이식
김희제 ( Hee Je Kim ),민우성 ( Woo Sung Min ),박윤희 ( Yoon Hee Park ),김유진 ( Yoo Jin Kim ),이석 ( Seok Lee ),김동욱 ( Dong Wook Kim ),이종욱 ( Jong Wook Lee ),김춘추 ( Chun Choo Kim ) 대한내과학회 2003 대한내과학회지 Vol.65 No.1
목적 : 고 위험군 급성 골수성 백혈병 환자의 치료를 위해 가톨릭조혈모세포이식센터에서 새로 개발된 이식전처치법을 이용한 가족간 주조직 적합항원 완전 일배체 불일치 동종 이식의 임상 적용 가능성을 알아보고자 하였다. 방법 : 4예의 급성 골수성 백혈병 환자들이 주조직 적합항원이 정확히 일배체씩만 일치하는 각각의 가족내이식 공여자로부터 조혈모세포 이식을 받았다. 전신 방사선 분할, 조사 부썰판 정주, 항흉선 그로부린, fludarabine을 이식 전처치요법 Background : Haploidentical transplantation has become a considerable clinical choice for acute myeloid leukemia (AML) patients lacking a HLA matched donor. We tried to reveal the possible role of a full haplotype mismatch transplantation. Methods : Four
김진영(Kim, Jin-Young),박성준(Park, Sung-June),박해명(Park, Hae-Young),김우성(Kim, Woo-Sung),김휘영(Kim, Hwi-Young),김희제(Kim, Hee-Je) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
The technology of Solar Power conversion System is defined as a solar cell that changes the sol ar energy into the direct electric energy, power conversion and control technology that convert the dc power into ac power The solar cell module, power conversion, and a control part in component parts consisting a solar power conversion system have influence on its performance. The roles of power conversion and a control part supply the direct current generated by solar cell module for a load with high efficiency as conveniently as possible in this study, the power conversion systen that can generate solar power using DSC module was developed and its characteristics was experimented. The characteristics of the DSC power conversion system including MOSFET and DSP micro processor, high speed devices, was simulated using Psim. According to the results, converter and inverter was manufactured in detail and the performance characteristics were studied.
타인 동종 말초혈액 조혈모세포이식 후 발생한 공기-누출 증후군 1예
김시현 ( Si Hyun Kim ),신주영 ( Ju Young Shin ),황현석 ( Hyun Suk Hwang ),김대준 ( Dae Jun Kim ),김희제 ( Hee Je Kim ),민우성 ( Woo Sung Min ),김춘추 ( Chun Choo Kim ) 대한내과학회 2008 대한내과학회지 Vol.74 No.4
Bronchiolitis obliterans, a late, non-infectious pulmonary complication of bone marrow transplantation (BMT), is an obstructive airway disease associated with chronic graft-versus-host disease (cGVHD). We report a rare case of air-leakage syndrome including pneumothoraces, pneumomediastinum, and subcutaneous emphysema with bronchiolitis obliterans after allogeneic peripheral blood stem cell transplantation (PBSCT) from an unrelated donor. The pathogenesis of air-leakage syndrome is not fully understood, and its management has not yet been established. This patient was treated with high-concentration oxygen, tube thoracostomy, percutaneous drainage with a pigtail catheter to relieve the tension pneumomediastinum, and mechanical ventilatory support. The patient has now recovered and is being followed on an outpatient basis.(Korean J Med 74:445-450, 2008)