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.

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.

B16 멜라닌 세포에서 해양소재 추출물의 멜라닌 생성 저해 효과

이찬 ( Chan Lee1 ),장정희 ( Jung Hee Jang ),안은미 ( Eun Mi Ahn ),박찬익 ( Chan Ik Park ) 대한본초학회 2012 大韓本草學會誌 Vol.27 No.4

Objectives : Under normal condition melanin protects the skin from extracellular stimuli including ultraviolet (UV)-induced oxidative skin damages, but excess production and accumulation of melanin can induce hyperpigmentation causing esthetic problems. Therefore, in this study we tried to search for natural skin whitening materials from marine natural resources. Methods : Water and ethanol extracts of marine natural resources were prepared from Porphyra thalli (PT), Laminariae thallus (LT), Ostreae concha (OC), Sargassum thallus (ST), Undaria thallus (UT), Codium thalli (CT), Enteromorpha thalli (ET), Syngnathoides biaculeatus (SB), and Hippocampus coronatus (Hc). Their effects against UVB and α-melanocyte stimulating hormone (α-MSH)-induced melanogenesis were investigated based on melanin formation in B16 mouse melanoma cells. The mRNA and protein expression of enzymes involved in the melanogenic process were further examined by reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot analysis, respectively. Results : Water extract of Ostreae concha (OCW/E) effectively inhibited UVB and α-MSH-induced melanin production in B16 melanocytes, which seemed to be mediated by inhibition of mRNA expression of tyrosinase and tyrosinase-related protein 1 (TRP-1). In another experiment, ethanol extracts from Porphyra thalli (PTE/E), Laminariae thallus (LTE/E), Sargassum thallus (STE/E), Undaria thallus (UTE/E), Codium thalli (CTE/E), Syngnathoides biaculeatus (SBE/E), and Hippocampus coronatus (HcE/E) significantly suppressed UVB and α-MSH-induced melanin formation. Furthermore, ethylacetate fraction isolated form LTE/E (LTE/EEt) decreased UVB and α-MSH-elevated extracellular melanin levels via inhibition of tyrosinase protein expression. Conclutions : These results suggest that marine natural resources such as Porphyra thalli, Laminariae thallus, Ostreae concha, Sargassum thallus, Undaria thallus, Codium thalli, Syngnathoides biaculeatus and Hippocampus coronatus have anti-melanogenic effects, thereby exhibiting high potentials to be utilized as one of the ingredients for the development of new whitening functional cosmetics.

건강마을사업과 안전거리조성사업의 혼합시행에 관한 연구

이찬서(Chan seo Lee) 한국공공디자인학회 2022 공공디자인연구 Vol.5 No.-

‘기술과 디자인은 하나다’라로 시작된 융합은 이미 4차 산업혁명의 시작으로 입증되었다. 본 연구에서는 CPTED(범죄예방디자인)의 사업과 인지건강마을조성 사업을 합하여 동시에 안전과 건강을 도모하는 두 가지의 사업의 가능성을 제시하고자 현재 시행되고 있는 두 가지 사업의 사례와 통계, 그리고 해당사업 조사자료를 통해 확인하고 각 사업의 장점을 최대한 활용을 하여 공공디자인이 거주민의 안전과 건강을 지키는 우선적 역할을 확고히 하고자 한다. 이러한 목적을 달성하고자 본 연구는 다음과 같은 사례연구과정을 거치게 되었다. 먼저, 현재 국내에 진행되어진 CPTED사업과 디자인적 상황을 조사하고, 두 번째로 시행 완료된 인지건강마을인 삼태기건강마을의 사례를 조사하여, 인지건강사업이 CPTED사업과 융합이 가능한지를 확인하였다. 이러한 연구를 통하여 향후 진행되는 사업이 CPTED의 범죄예방만이 아닌 각 지역적 특색에 맞춘 고령화 사회의 거주민 안전과 건강을 동시에 수행이 가능하도록 하여 공공디자인이 가진 역할을 최대치로 올리는 것을 기대해 본다. The convergence that started with the saying ‘technology and design are one’ has already been proven as the beginning of the 4th industrial revolution.In this study, the CPTED(Crime Prevention Through Environmental Design) project and the cognitive health village development project are combined to present the possibility of two projects that promote safety and health at the same time. Through the case and statistics of the two projects that are being re-implemented, we want to confirm through the survey data and to make the most of the strengths of each project to ensure that public design has a priority role in protecting the safety and health of residents. To achieve this purpose, this study went through the following case study process. First, we investigate the current CPTED project and design situation in Korea, By examining the case of Samtaegi Health Village, which is the second cognitive health village that has been implemented, It was confirmed whether the G-Health project could be fused with the CPTED project.Through this study, future projects are expected to maximize the role of public design by enabling not only CPTED crime prevention, but also the safety and health of residents in an aging society tailored to each regional characteristic.

경쟁력 강화를 위한 월곡중학교 학교브랜드 아이덴티티의 상징성 연구

이찬서(Lee, Chan Seo),엄기준(Um, Ki Joon) 한국디자인리서치학회 2017 한국디자인리서치 Vol.2 No.1

Recent schools have been focusing on promoting students for the recruitment of students. In this period of new change in the education field, the value of the symbol for the purpose of advertisement and publicity like the general corporation is increased. However, it differs from the basic ideology of the school, which is rooted in education. The ideal part of education and public relations is the symbol of the school, or UI(University Identity). Private schools are currently in a state of improvement for branding, but in the case of public schools, school UIs do not stand out. The UI of the existing school emphasizes not only the meaning of symbolism but also the meaning of the founder of the foundation or the foundation. The symbolism that only the school has is not shown much. It is easy to see the image of the school and the goal of the school pursued by anyone who persuades the tradition and the symbolism of the school education and induces the branding to take along with the UI, I hope that the students will be able to provide new issues in the educational field by improving the symbolism of the students and making them proud of the school and being satisfied with the school. 근래의 학교는 학생의 수가 줄어 학생모집을 위한 홍보에 초점을 맞추고 있다. 이런 교육현장의 새로운 변화의 시기에 학교가 일반기업체처럼 광고와 홍보를 목적으로 하는 상징성의 가치는 커졌다고 할 수 있다. 그러나 교육에 근본을 두는 학교의 기본 이념과는 차이가 있다, 이런 시기에 교육과 홍보를 이상적부분이 바로 학교의 상징적 마크, 즉 UI(University Identity)라고 생각되어진다. 사립학교는 이미 브랜드화를 위해 학교UI에 중요성을 인식하고 현재 개선 상태이나, 공립학교의 경우 학교UI는 크게 두드러지지 않는다. 기존 학교의 UI는 상징성의 의미보다는 전통성이나 재단의 설립자가 정한 의미를 강조하는 측면이 높다보니 학교만이 가지고 있는 상징성은 크게 나타내지지 않는 단점 을 가지고 있다. 학교교육이 가지고 있는 전통과 상징성을 계승시키며, 브랜드화를 함께 가지고 갈 수 있도록 유도 하여 학생들이 학교에 대한 자부심과 학교가 추구하는 전통과 역사, 이념적 목표를 상징적으로 담아 낼 수 있다면, UI를 보기만 해도 누구든 그 학교의 이미지와 학교가 추구하는 교육의 목표를 쉽게 알 수 있고, 교육의 특수성과 학교의 상징성을 동시에 개선해 학생이 학교에 자부심을 가지고 학교에 만족하는 생활이 됨으로서 교육현장의 새로운 이슈를 제공할 수 있을 것을 기대 해 본다.

사상, 철학, 그리고 유학: 송명유학에 접근하는 세 가지 경로

이찬 ( Lee¸ Chan ) 한국사상사학회 2021 韓國思想史學 Vol.- No.67

유학은 어떻게 서술되어야 하는가? 지금까지 ‘송명유학’을 이해하는 주된 방식은 ‘사상’이나 ‘철학’의 기표를 통해서였다. 송명유학을 도학이라고 규정하거나 정주이학과 동일시해온 관점이 이를 분명하게 보여준다. 나는 유학의 역사를 이해하는 이런 관점을 다시 검토하고 송명유학을 연구하는 ‘사상’과 ‘철학’의 방법론적 문제를 성찰하려 한다. 특히, 송명유학을 규정하는 ‘신유학’과 ‘도학’이라는 용어에 관한 쟁점은 송대 이후의 유학사를 철학적 사유로 해석할 것인지, 사상사라는 역사학의 관점으로 접근할 것인지 라는 문제가 놓여 있다. 이들 용어가 함의하는 바를 통해 ‘사상사’와 ‘철학사’, 그리고 철학과 유학의 경계를 개념적으로 분명하게 구분 지을 필요가 있다. 이 문제는 ‘유학’의 학문적 위상을 비판적으려는 이론적인 시도를 ‘거짓문제’라고 규정한 거자오광의 관점을 비판하면서 앞서 언급한 문제들을 논의하려 한다. 이를 통해 전통적 사유를 이해하는 학문적 틀, ‘유학’을 오늘날 우리의 인식론적 틀 속에 재정의하는 계기를 마련하기를 기대한다. How should Confucianism be written? Until now, the dominant way to understand ‘Song-Ming Confucianism’ has been through the signifiant of ‘philosophy’ or ‘thought.’ This is clearly illustrated by the view that Song-Ming Confucianism has been defined as the Learning of the Way(daoxue), or identified with Cheng-Zhu School of the Learning of Principle (chengzhu lixue). I shall revisit this understanding of the history of Confucianism and scrutinize the methodological issues of though and philosophy approaching to Song-Ming Confucianism. To examine the process of debate on how to define Song-Ming Confucianism through the concepts of “Neo-Confucianism(xinruxue)” and “the Learning of the Way(daoxue)” is to verify a borderline between history of thought and philosophical way of thinking. Through the implication of difference between these terms, we need conceptually to distinguish between history of thought and history of philosophy, and to clarify between philosophy and Confucianism. This problem provides a momentum to critically examine the academic status and nature of Confucianism. I will start the aforementioned issues by criticizing the view of Ge Zhaoguang, which defines the theoretical attempts to establish Chinese philosophy as a fake problem. Through this argument, thus, I hope to provide an opportunity to look back on the conceptual relationship between philosophy and Confucianism, or to revisit the conception of Confucianism, which should be redefined within our epistemological framework today.

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.

도로표지판 디자인 개선에 관한 연구

이찬서(Lee, Chan Seo) 한국디자인리서치학회 2016 한국디자인리서치 Vol.1 No.3

우리나라는 60~70년대 급격한 경제의 발전을 이룬 상태에서 무분별한 개발이 이루어지다보니, 사회안전망 및 시설물 등에 상대적으로 많이 취약하게 조성되어져 왔다. 이런 부분들은 어느 한 부분에서만 보이는 것이 아니라, 산업체 전반에 걸쳐 많이 드러나고 있는 것이 사실이다. 많은 부분들이 있지만 본 연구에서는 도로표지와 관련되어 안전이 반드시 필요한 시설물에 대해 디자이너의 시선으로 작은 색상부분의 제한적 규제와 디자인만을 변형시켜 규제의 변경과 도로의 현실에 맞는 제안을 하고자 한다. 물론 시중에는 안전성이 포함되어져 있는 제품들에 예쁜 디자인을 가지고 제품화되어 있는 많은 아이디어 제품들이 출시되어 있고, 또 발전하고 있지만 실제 우리 생활에서의 적용은 도로표지판규칙으로 인해 그리 크지 않은 상태이다. 이에 본 연구는 당장은 한꺼번에 시행되어지기 어려운 도로의 표지판 부분을 단계적으로 시행 가능하도록 유도하고, 사용자의 입장과 실제 사용하는 사람들이 정확한 목적지를 찾는데 사용할 수 있도록 개선이 가능한 부분을 알아보고자 한다. 현재 실제 도로의 상황을 사례를 통하여 알아보고, 우리 실생활에서 발생되는 문제점과 그에 대한 해결책도 외국의 사례를 통해 개선방안을 제시하고자 한다. 우리가 편리하게 이용할 수 있도록 작은 색상변화를 주고, 도시미관과 어우러져 도시환경을 저해하지 않은 상태에서 미래지향적 도시의 발전을 위한 GPS연계 시스템을 이용하여 사용자의 안전과 도시발전을 도모하는 공공디자인의 한 분류로서 안전하고 거리에 맞는 디자인과 환경개선 부분들에서 개선점을 제공할 수 있을 것을 기대 해 본다. In Korea has achieved rapid economic development in the 60s and 70s, Indiscreet development has been achieved. Social safety nets and facilities. It is true that these parts are not only seen in one part but also in the whole industry. In this study, however, the designer wants to change the regulation and the design of the road by changing only the restrictive regulation and design of the small color part with the eyes of the designer for the facilities which must be safe in relation to the road sign. Of course, there are a lot of ideas products that are commercialized with pretty designs in products that include safety in the market, and they are developing. However, the actual application in our lives is not very large due to road sign rules. Therefore, this study suggests that the sign sections of roads which are difficult to implement at once can be implemented step by step. We will look at what you can do and where you can make improvements so that you can use it to find the right destination. The present situation of the actual road is examined through an example, We will also present solutions to the problems that arise in our lives and solutions to them through examples from foreign countries. We give small color changes for convenient use, The development of a futuristic city in harmony with urban beauty and without compromising the urban environment. It is expected to be able to provide improvement in design and environment improvement parts that are safe and suitable for distance as a classification of public design that promotes user safety and city development by using GPS link system.

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.

재생펌프의 성능해석 및 최적화에 관한 연구

이찬,성형진,권장혁,정명균,Lee, Chan,Sung, Hyung-Jin,Kwon, Jang-Hyuk,Chung, Myung-Kyoon 대한기계학회 1991 대한기계학회논문집 Vol.15 No.2

A performance of a regenerative pump has been analyzed using various pressure loss correlations. The predicted head and efficiency agree favorably with experimental data, which confirms the validity of the present analysis. In addition, performance improvement is made through the optimization of the open channel geometry configuration and the capacity of the regenerative pump. The optimized pump has better efficiency, higher head and larger flow coefficient. Moreover, its operation range is wider than that of the conventional unit.