터보펌프용 전진익형 인듀서에 대한 연구

김진선,홍순삼,김진한,최창호,Kim, Jin-Sun,Hong, Soon-Sam,Kim, Jin-Han,Choi, Chang-Ho 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.2

Computational and experimental studies on the forward-sweep inducer for the rocket-engine turbopump are presented in comparison with the conventional backward-sweep inducer. Computational results show that back flows at the inlet decrease in the case of forward-sweep inducers compared to the back-ward inducer. Moreover, the low pressure region at the back flow is decreased, which is presumed to improve the suction performance of the inducers. Experimental results show that the suction performance of the forward-sweep inducer is almost the same as that of the backward-sweep inducer although it has smaller inlet tip diameter and shorter length. The efficiency of the forward-type inducer is found better than that of the backward-sweep inducer due to the small size of back flows.

Effect of Presurgical Nasoalveolar Molding in Unilateral Cleft Lip and Palate Infants

김진선,김영진,남순현,김현정,Kim, Jin-Sun,Kim, Young-Jin,Nam, Soon-Hyeun,Kim, Hyun-Jung Korean Academy of Pediatric Dentistry 2013 대한소아치과학회지 Vol.40 No.3

Cleft lip and palate, the most common craniofacial anomalies, are severe congenital defects that have an incidence of 0.28 to 3.74 per 1000 live births. Although there has been great improvement in the field of cleft surgery, surgical approach cannot be the single solution to resolve the various problems encountered in patients with cleft lip and palate. The concept of presurgical infant orthopedics (PSIO) for gradual closure of the cleft gap and simplified surgical performance was first introduced by McNeil in 1950. Recently, there are many attempts not only to approximate the alveolar segments but also to reshape the nasal cartilage. Three infants with unilateral cleft lip and palate were referred from the department of Plastic Surgery for presurgical nasoalveolar molding (PNAM). Maxillary appliances using resin with orthodontic wire were fabricated. Then these appliance was applied until patients underwent lip surgery. In all cases, the patients could wear the appliance all day since they were able to eat even with the appliance on, This resulted in significant improvements in the nasal symmetry were found. Our appliance, namely K-NAM, extends the wearing time within the limited period and as a result it is expected to maximize the treatment effects. Used properly, this appliance would play a major role in enhancing nasal symmetry with satisfactory results.

액체질소를 이용한 터보펌프 인듀서의 수력성능시험

김진선,홍순삼,김진한,Kim Jin-Sun,Hong Soon-Sam,Kim Jin-Han 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.4

A cryogenic test facility has been developed to perform inducer and pump tests using liquid nitrogen. Performance tests of a turbopump in the maximum 50ton-thrust class can be performed with cryogenic fluid in the facility which operates at a temperature around -196oC with the rotational speed up to 30,000rpm To verify the reliability of the cryogenic pump test facility, hydraulic performance tests of an inducer were accomplished, and their results were compared with the result from a water test. The results confirm the reliability of the cryogenic test facility, and it is expected to contribute for on-going development of a turbopump for liquid rocket engines.

해양환경 내 비다공성 표면에 유류된 잠재지문 현출방법에 따른 STR 분석 연구

김진선,김세인,윤현경,추민규,Kim, Jin-Sun,Kim, Sea-In,Yoon, Hyun-Kyoung,Choo, Min-kyu 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.10

Among the various evidence found in maritime crimes, fingerprints and DNA are very important in that they can identify a suspect. In this study, 5 types of non-porous surfaces (plastic, stainless, glass, ceramic, FRP), which are often found as evidence in the actual marine environment, were selected, and latent and blood fingerprints were passed down and immersed at the Donghae Maritime Police Station's exclusive pier for about 7 days. After that, DNA extraction, quantification, and STR profile were analyzed after fingerprint developing CA fumming method and 4 powder methods (Swedish black powder, Concentrated black powder, Supranano red powder, Dazzle orange powder). Among the fingerprint developing methods, when Supranano red powder was applied, a relatively high amount of DNA was found. As a result of STR profile analysis, an average of 16.8 to 9 loci were secured, and all 20 were confirmed in glass and ceramic materials. As a result of the study, it was possible to secure the STR profile by extracting and quantifying DNA after applying the fingerprint developing method to virtual evidence immersed for about 7 days, and further research is needed to secure the STR profile by analyzing DNA after applying various fingerprint developing methods such as VMD and SPR.

다수 비예혼합 화염의 안정화 특성

김진선,이병준,Kim, Jin-Sun,Lee, Byeong-Jun 대한기계학회 2003 대한기계학회논문집 Vol.27 No.10

The stability of turbulent nonpremixed interacting flames is investigated in terms of nozzle configuration shapes and kind of fuels. Four nozzle arrangements - cross 5, matrix 8, matrix 9 and circle 8 nozzles - are used in the experiment. There are many parameters affecting flame stability in multi-nozzle flames such as nozzle separation distance, fuel flowrates and nozzle configuration etc. Key factors to enhance blowout limit are the nozzle configuration and the existence of center nozzle. Even nozzle exit velocity equal 204 m/s, flame is not extinguished when there is not a center nozzle and s/d=15.3∼27.6 in matrix-8 and circular-8 configurations. At these conditions, recirculation of burnt gas is related with stability augmentation. Fuel mole fraction measurements using laser induced fluorescence reveal lifted flame base is not located at the stoichiometric contour.

회원작품 - 더 끌림

김진선,Kim, Jin Sun 대한건축사협회 2024 건축사 Vol.666 No.-

대전입자형 디스플레이 소자의 점유면적 평가방법에 의한 구동특성 및 메모리 효과 분석

김진선,김영조,Kim, Jin-Sun,Kim, Young-Cho 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.8

The charged particle type display is a kind of the reflectivity type display and shows an image by absorption and reflection of external light source, which has keep an image without additional electric power because of bistability. In this paper, we made a device whose cell gap is $56\;{\mu}m$ and also analyzed driving and memory characteristics by applied driving voltages. As a result, we found that the driving voltage and memory effect depend on q/m(charge to mass ratio) of charged particle. In this case of breakdown voltage, the devices showed degradation of reflectivity and memory effect due to irregular movement of overcharged particles. In addition, contrast ratio of the device varies with memory effect. Thus, we consider that device needs uniform q/m for improvement of electric and optical properties and memory effect.

대전입자형 디스플레이 소자의 충전전압에 따른 구동특성 분석

김진선,김영조,Kim, Jin-Sun,Kim, Young-Cho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.1

The charged particle type display device is a kind of the reflectivity type display and shows an image by absorption and reflection of external light source. The charged particle is important factor for driving of the display and quantity of charge per mass of the charged particle determines the driving voltage, contrast ratio, response time, etc. But it is easy for the charged particles to be damaged in the putting process of the display and the damages cause lumping phenomenon of the charged particles. Because the lumping phenomenon makes high driving voltage, low quality of optical properties, short life time, etc, so the charged particles must be filled by stable putting methods. In this paper, we filled the charged particles into the panels by electric fields to improve the electrical and optical characteristics of the display. Also, we analyzed the driving characteristics of the charged particles according to the applied putting voltages.

다수 비예혼합 화염의 안정화 특성

김진선,이병준,Kim, Jin-Sun,Lee, Byeong-Jun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10

The stability of turbulent nonpremixed interacting flames is investigated in terms of nozzle configuration shapes and kind of fuels. Four nozzle arrangements - cross 5, matrix 8, matrix 9 and circle 8 nozzles - are used in the experiment. There are many parameters affecting flame stability in multi-nozzle flames such as nozzle separation distance, fuel flowrates and nozzle configuration etc. Key factors to enhance blowout limit are the nozzle configuration and the existence of center nozzle. Even nozzle exit velocity equal 204 m/s, flame is not extinguished when there is not a center nozzle and s/d=15.3∼27.6 in matrix-8 and circular-8 configurations. At these conditions, recirculation of burnt gas is related with stability augmentation. Fuel mole fraction measurements using laser induced fluorescence reveal lifted flame base is not located at the stoichiometric contour.

다문화가정 학생 진로상담에 관련한 국내연구 동향에 관한 탐색적 연구

김진선(Jin Sun Kim),김영순(Youngsoon Kim) 중앙대학교 한국교육문제연구소 2020 한국교육문제연구 Vol.38 No.3

본 연구의 목적은 다문화가정 학생의 진로상담에 관한 국내연구를 선정하여 분석하고 연구 동향을 탐색하는 것이다. 이를 통해 향후 다문화가정 학생의 진로상담 연구의 발전에 기여하고자 한다. 본 연구는 2010년부터 2020년 4월까지 학회지에 게재된 논문 중 ‘다문화’, ‘진로’, ‘다문화 진로’, ‘다문화 학생’과 ‘진로상담’을 핵심어로 선정된 논문을 3차례의 선정 및 배제 과정을 통하여 총 58편을 분석하였다. 분석의 틀은 선행연구 분석과 두 차례의 범주화와 평정 및 점검 과정을 수행하여 기본정보, 연구대상, 연구방법, 연구주제로 범주화하여 분석하였다. 연구결과, 첫째, 다문화가정 학생 진로상담 관련 논문은 교육, 상담심리, 청소년, 사회복지 분야 등에서 꾸준히 출간되고 있다. 둘째, 다문화가정 학생을 구분하지 않고 연구된 논문이 많았고, 중, 고등학생이 주로 연구에 참여하였고 패널데이터가 많이 사용되었다. 셋째, 연구방법은 주로 양적 연구가 사용되었다. 넷째, 연구주제는 진로발달, 진로장벽, 진로 태도 등 진로 관련 변인이 다루어졌고 진로상담 프로그램에서는 진로성숙도, 진로결정 효능감, 진로인식과 진로집단상담이 다루어졌다. The purpose of this study is to select and analyze domestic studies on career counseling for students from multicultural families, and to explore research trends. Through this, we intend to contribute to the development of career counseling research for students from multicultural families. This study was selected three times from 2010 to April 2020 research papers selected as key words of "multicultural", "career", "multicultural career", "multicultural students" and "career counseling". And a total of 58 pieces were analyzed through the exclusion process. When deriving the analysis framework, the analysis was conducted by categorizing it into basic information, research objects, research methods, and research subjects by conducting two categories of prior research analysis and evaluation. As a result of the research, first, multicultural family student career counseling papers are continually published in education, counseling psychology, youth, and social welfare. Second, there were many papers that were studied without classifying multicultural family students, middle and high school students mainly participated in the research, and panel data was used a lot. Third, quantitative research was mainly used for the research method. Fourth, research topics included career development, career barriers, career attitudes, and career counseling programs. Career maturity, career decision efficacy, career recognition, and career group counseling were covered. The results of this analysis made suggestions for the study.