다기능성 환원-산화 그래핀/실크 피브로인 기반 센서

이찬의(Chanui Lee),조현호(Hyeonho Cho),이차범(ChaBum Lee),이상민(Sangmin Lee),김승한(Sunghan Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

SFA(Successive Force Augment)를 이용한 시간영역 수동성을 기반 햅틱 제어기 설계

이찬일(C. I. Lee),유지환(J. H. Ryu) Korean Society for Precision Engineering 2018 한국정밀공학회 학술발표대회 논문집 Vol.2018 No.10월

SFA(Successive Force Augment)를 이용한 특수목적기계의 원격 조종 시스템 시뮬레이션

이찬일(C. I. Lee),유지환(J. H. Ryu) 한국정밀공학회 2017 한국정밀공학회 학술발표대회 논문집 Vol.2017 No.12월

ROS 기반의 자율주행 서빙로봇 개발에 대한 연구

이찬해(C. H. Lee),안태준(T. J. Ahn),정해진(H. J. Jeong),이현우(H. W. Lee),정명진(M. J. Chung) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.10

석탄가스화 복합발전플랜트 가스터빈 압축기와 공기분리장치 간의 최적 연계설계를 위한 매개변수연구

이찬,김형택,Lee, Chan,Kim, Hyung-Taek 한국에너지학회 1996 에너지공학 Vol.5 No.2

석탄가스화복합발전소의 가스터빈 공기압축기와 공기분리장치 간의 최적 연계설계를 위한 매개변수 연구를 수행하였다. 본 연구에서는 복수형 증류탑공정의 공기분리장치를 사용하였으며, 증류탑공정의 특성으로부터 압축기와의 연계조건인 공기추출량, 공기추출압력 및 공기/질소 열교환 조건들을 정의, 수식화하였다. 공기분리장치와 연계된 가스터빈용 공기압축기의 성능변화는 유선곡률방법과 압력손실모델을 결합한 해석방법을 사용하였으며, 예측결과들을 실제 압축기성능 시험결과와 비교하여 예측정확도를 검증하였다. 본 압축기성능 해석방법을 이용하여, 압축기와 공기분리장치의 연계조건인 열교환기의 핀치포인트 온도차, 추출공기량 및 추출 공기압력이 압축기성능에 미치는 영향을 정량적으로 검토하였다. 공기추출량이 늘어나거나 핀치포인트 온도차가 커질수록, 압축기의 압축비 및 소요동력은 증가하였다. 반면에, 압축기 효율은 공기추출량의 증가에 따라 고압공기추출시에는 저하되고, 저압공기추출시에는 향상되었다. 더나아가, 압축기의 일반화된 입구조건과 효율간의 특성곡선을 통해, 압축기 효율을 극대화 할 수 있는 압축기/공기분리장치간의 최적연계조건을 제시하였다. Parametric studies are conducted for optimizing the integration design between gas turbine compressor and air separation unit (ASU) of integrated gasification combined cycle power plant. The present study adopts the ASU of double-distillation column process, from which integration conditions with compressor such as the heat exchanger condition between air and nitrogen, the amount and the pressure of extracted air are defined and mathematically formulated. The performance variations of the compressor integrated with ASU are analyzed by combining streamline curvature method and pressure loss models, and the predicted results are compared with the performance test results of actual compressors to verify the prediction accuracy. Using the present performance prediction method, the effects of pinch-point temperature difference (PTD) in the heat exchanger, the amount and the pressure of extracted air on compressor performances are quantitatively examined. As the extraction air amount or the PTD is increased, the pressure ratio and the power consumption of compressor are increased. The compressor efficiency deteriorates as the increase of the flow rate of air extracted at higher pressure level while improving at lower pressure air extraction. Furthermore, through the characteristic curve between generalized inlet condition and efficiency of compressor, optimal integration condition is presented to maximize the compressor efficiency.

Nitrous Oxide - Oxygen 의 장기노출이 백서 혈구세포에 미치는 영향에 관한 실험적 연구

이찬일(Chan Il Lee) 대한악안면성형재건외과학회 1984 Maxillofacial Plastic Reconstructive Surgery Vol.6 No.1

N/A The purpose of this study was to observe hematologic alterations following prolonged inhalation of the nitrous oxide-oxygen in rats. For this study, 56rats weighing an average of 150gm were selected and devided into control and experimental groups. The experimental groups were then categorized as fallows: 1. 20 percent nitrous oxide-80 percent oxygen group. 2. 50 percent nitrous oxide-50 percent oxygen group. 3. 70 percent nitrous oxide-30 percent oxygen group. The experimental groups were exposed within closed chamber to an atmosphere of above concentrations at a flow of 2L.fminute for either 8 hours (Intermittent group) or 24 hours (Continuous group) daily for various period. Carbon dioxide was absorbed by soda 1ime. Whenever the chamber was opened for addition of food and water or removal of animals the inflow rate of nitrous oxide-oxygen was increased m 10L./minute for 5 minutes, At the 1st, 3rd, 6th, and 7th days, experimental groups were sacrificed by giving Ketamine HCL of 1mg/100gm of body weight with intramuscular injection. When the animals anesthetized, the thoraces were opened and blood samples were drawn into a 5ml disposable syringe from the heart then placed in a bottle containing E.D.T.A. This blood samples were used for counts of red blood cell, white blood cell, hematocrit, hemoglobin, and used to make a smear for white blood cell differential counts and studies. These counts were immediately performed en the sacrificed time. The red blood cell and white blood cell counts were made by standard method and the differential leukocyte counts were conducted by examination of blood films stained with Wrights stain. The hemoglobin concentration was determined with Corning 950 Hemoglobinmeter (Corning Co., U.S.A.) and the hematocrit value was determined by the method of capillary hematocrit. The mean corpusclar volume (M.C.V.), mean corpuscular hemoglobin (M.C.H.), and mean corpuscular hemoglobin concentration (M.C.H.C.) were calculated by the method of Wintrobe. The following results were obtained: 1. The significant eviedence of leukopoietic depression was found on the 5th and 7th days of continuous exposure groups to 50%, 70% nitrous oxide. (0.82±0.18 -2.65±0.15 10(3)/Cu, mm., p<0.01) 2. Red blood cell counts were within normal limits. 3. Hemoglobin concentration suggested a significant decrease on the 7th day dxperimental groups. (10.5±0.2 -11.6±Omg/100ml., p<0.01) 4. Hematocrit values suggested a significant decrease on the 3rd, 5th and 7th days of continuous exposure to 70% nitrous oxide. (29.0±1.0 -31.25±0.5%, p< 0.01) 5. Mean corpuscular volume (M.C.V.) values suggested a significant decrease on the 5th and 7th days of all experimental groups. (39.6±1.29 -52.78±2.46 Cu. μ., p<0.01) 6. Mean corpuscular hemoglobin (M.C.H.) values suggested a significant decrease on the 1st, 7th days of continuous exposure groups to 20%, 50% nitrous oxide. (13.13±0.05 -16.61±0.2 μμg., p<0.01) 7. The significant evidence of neutropenia was found on the 3rd day to 20% continuous, 70% intermittent exposure groups and the 5th, 7th days all experimental groups. (0-8.75± 5.29%. p<0.01) 8. Lymphocytes were relatively resistant to nitrous oxide in the all experimental groups.

주요매개변수에 따른 복사매질 내에서의 열전달 특성에 관한 연구

이찬,백승욱,Lee, Chan,Baek, Seung-Wook 대한기계학회 1988 대한기계학회논문집 Vol.12 No.6

본 연구에서는 앞서의 여러 경우에서 단순하게 취급 되었던 화염면과 연료표 면의 경계조건을 무한히 길고, 평행한 확산, 회색 평판(gray, diffuse plates)으로 보 고, 이 두 평판 사이에 흡수(absorbing), 방사(emitting), 산란(scattering)을 하는 회색매질(gray medium)이 차여져 있다고 생각한다. 이런 가정하 에서, 여러 매개변 수들을 변화시켜가며 전도, 대류, 복사열전달들의 상호작용과 온도 분포를 수치적으로 해석하였다. 특히 화염면과 연료표면간의 열교환에 있어서의 분출에 의한 효과와 복 사열전달의 영향에 관심을 기울였다. The heat transfer by simultaneous conduction, convection and radiation between flame and fuel surface in a thermally radiating medium is investigated theoretically. The flame and fuel surface are assumed to be diffuse, gray, infinite, isothermal, parallel surfaces separated by a finite distance. The space between the plates is supposed is formulated exactly in terms of simultaneous interior-differential equations. The numerical results reveal the effect of the system parameters on the heat transfer characteristics and the temperature distributions. The numerical results reveal that the optically thick radiating medium has a blocking effect on the total beat transfer. The temperature distributions are observed to be convex upward for an optically thick radiating medium as the alberto decreases.

석탄가스화 복합발전용 가스터빈의 성능 평가

이찬,이진욱,윤용승,Lee, Chan,Lee, Jin-Wook,Yun, Yong-Seung 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.1

This simulation method is developed by using GateCycle code for the performance evaluation of the gas turbine in IGCC(Integrated Gasification Combined Cycle) power plant that uses clean coal gas fuel derived from coal gasification and gas clean-up processes and it is integrated with ASU(Air Separation Unit). In the present simulation method, thermodynamic calculation procedure is incorporated with compressor performance map and expander choking models for considering the off-design effects due to coal gas firing and ASU integration. With the clean coal gases produced through commercially available chemical processes, their compatibility as IGCC gas turbine fuel is investigated in the aspects the overall performance of the gas turbine system. The predictions by the present method show that the reduction of the air extraction from gas turbine to ASU results in a remarkable increase in the efficiency and net power of gas turbines, but it is accompanied with a shift of compressor operation point toward to surge limit. In addition, the present analysis results reveal the influence of compressor performance characteristics of gas turbine have to be carefully examined in designing the ASU integration process and evaluating the overall performance parameters of the gas turbine in IGCC Power plant.

송풍기 분야 연구동향

이찬,Lee, Chan 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.1

석탄가스화 복합발전 플랜트 개념설계용 Engineering Packages 선정

이찬,윤용승,이진욱,김형택,정근모,Lee, Chan,Yun, Yong-Seung,Lee, Jin-Wook,Kim, Hyung-Taek,Chung, Kun-Mo 한국에너지학회 1995 에너지공학 Vol.4 No.1

석탄가스화 복합발전 플랜트의 시스템설계를 위한 engineering package의 체계 및 방법론에 대해 소개하였다. Engineering package는 플랜트 전체 개념설계 과정과 주요 공정을 구성하는 요소에 대한 설계/해석/시험 과정으로 나누어 진다. 개념설계과정은 설계목적과 제한조건을 충족시키도록 플랜트구성 설계, 정적/동적 시뮬레이숀, 요소별 설계사양 결정 및 Data Base Management System으로 이루어지며, 개념설계 과정의 한부분인 주요요소의 설계는 1차원 성능해석, 2/3차원 열유체해석 및 실험 그리고 구조, 진동 해석 등으로 구성되는 반복적 과정이다. 그러므로, 본 연구에서는 이러한 설계체계들의 개발전략을 설명하고, 현재 이루어진 추진결과에 대해 설명하였다.