고 양력 타가 선박의 조종성능에 미치는 영향에 관한 연구

김상현,김현준,전희철,윤승배,박화평,김옥석,Kim, Sang-Hyun,Kim, Hyun-Jun,Jun, Hee-Chul,Yoon, Seung-Bae,Park, Hwa-Pyeong,Gim, Ok-Sok 해양환경안전학회 2010 海洋環境安全學會誌 Vol.16 No.4

최근 선박의 좌초 및 추돌 사고로 인한 해양오염이 심각해짐에 따라 선박의 조종성능에 대한 관심이 고조되고 있는 가운데 IMO에서는 Resolution MSC.137을 채택함으로써 조종성능에 대한 국제적인 기준이 강화되었다. 선박의 조종성능을 향상시키기 위해서는 여러 가지 방법이 있으나 본 연구에서는 타의 양적 증가가 조종성능 향상에 얼마나 기여하는지를 알아보고자 한다. 조종성능 평가 방법으로 수치 시뮬레이션을 이용하였고, 대상선형은 공시선형인 Mariner Class Vessel로 하였다. 조종성능 평가 방법은 선회 시험과 지그재그 시험을 수행하였고, 고 양력 타의 적용은 수학모델에서 타와 관련된 동유체력 미계수의 값을 양력 증가에 따라 변화 시켜 조종성능의 변화를 예측하였다. 시뮬레이션 결과, 타의 양력 증가로 인해 선회성능 개선이 예상되나, 변침성능을 저해할 가능성이 있는 것을 확인하였다. Recently, a vessel's maneuvering performance is considered to be an important subject as marine pollution from the ships that stranded on a rock becomes more severe. So, IMO(International maritime organization) has adopted Resolution MSC.l37 to enhance international standards of ship's maneuverability. There's more than one way to improve ship's maneuverability. This research focused on improving ship's maneuverability by high-lift rudder. To predict the maneuverability, the numerical simulation model was used. The evaluation of maneuverability was carried out by turning test and zig-zag test. The results obtained with these simulation showed that the high-lift rudder would be effective in improving the turning ability of the ship. But it was clarified that there Has a possibility that course changing ability night become bad through an increase of rudder lift.

원자력 발전소 배관재를 이용한 고온 수화학 조건에서의 방사화 부식생성물 모사에 관한 연구

김상현,김인섭,이건재,Kim Sang Hyun,Kim In Sup,Lee Kun Jai 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.1

High temperature - high pressure apparatus was developed to simulate nickel fewite corrosion products which were main compositions of the radioactive crud in the nuclear power plant. Corrosion product similar to the crud was obtained by a tube accumulator system. Nickel alloy (Inconel 690) and carbon steel (SA106 Gr. C) were corroded at 270 $\^{circ}C$ in the corrosion product generator. Ni ions and Fe ions dissolved by corrosion reaction were able to be transported to the accumulator because the crud generation mechanism was the solubility change with temperature. To evaluate the properties of simulated corrosion products, scanning electron microscope (SEM) observation and EDAX analysis were performed. SEM observation of corrosion product showed the needlelike or crystal structure of oxide depending on precipitating location. The crystal oxide was the nickel ferrite, which was similar to the crud in nuclear power plants.

Hydrologic Modeling of an Agricultural Watershed with Tile Drains and GIS

김상현,손광익,한건연,Kim, Sang- Hyun,Son, Kwang-Ik,Han, Kun Yeun Korea Water Resources Association 1996 물과 미래(한국수자원학회지) Vol.29 No.6

Tile drain의 특성을 갖는 농경지 유역에서의 강우-유출 모의를 위한 물리모형이 TOPMODEL 구조로부터 개발되었다. 본 모형은 GRASS 지리정보시스템에 의해서 DEM으로부터 제공되는 세부적인 지형정보를 기초자료로 하여 연구되었다. 9개의 가능한 흐름발생 시나리오가 제안되었고 모형개발 과정에 사용되었다. 토양 메트릭스와 tile 시스템에 있어서의 저류 및 지체효과가 2차 선형 저수지와 함께 모의되었다. 본 연구모형으로부터 tile 흐름, 지표하 흐름 및 지표면 흐름으로부터 야기되는 유출특성을 규명할 수 있었다. A physically based model for rainfall-runoff simulation in agricultural watersheds equipped with tile drains is developed from the TOPMODEL framework. The model is based on detailed topographical information provided by the Digital Elevation Model (DEM), which is available in the Geographic Information System GRASS. Nine possible flow generation scenarions are suggested and used in the development of the model. The storage and delaying effects in the soil matrix and in the tile system are simulated with a second order linear reservoir. The model can identify the portions of the hydrators resulting from tile flow, subsurface flow and surface runoff.

적응 학습방식의 신경망을 이용한 좌심실보조장치의 모델링

김상현,김훈모,류정우,Kim, Sang-Hyun,Kim, Hun-Mo,Ryu, Jung-Woo 대한의용생체공학회 1996 의공학회지 Vol.17 No.3

This paper presents a Neural Network Identification(NNI) method for modeling of highly complicated nonlinear and time varing human system with a pneumatically driven mock circulatory system of Left Ventricular Assist Device(LVAD). This system consists of electronic circuits and pneumatic driving circuits. The initiation of systole and the pumping duration can be determined by the computer program. The line pressure from a pressure transducer inserted in the pneumatic line was recorded System modeling is completed using the adaptively trained backpropagation learning algorithms with input variables, heart rate(HR), systole-diastole rate(SDR), which can vary state of system. Output parameters are preload, afterload which indicate the systemic dynamic characteristics. Consequently, the neural network shows good approximation of nonlinearity, and characteristics of left Ventricular Assist Device. Our results show that the neural network leads to a significant improvement in the modeling of highly nonlinear Left Ventricular Assist Device.

삼보 연-아연-중정석 광산 주변 하상퇴적물에서의 중금속 오염 연구

김상현,전효택,Kim, Sang-Hyun,Chon, Hyo-Taek 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.2

Stream sediment samples were collected in the vicinity of the Sambo Pb-Zn-barite mine in order to investigate dispersion patterns and pollution levels of heavy metals, and to find out their mode of occurrences. Those samples were analyzed for Cd, Cu, Pb, Zn, Fe, and Mn by using partial extraction and sequential extraction methods. Stream sediments of this studied area has been contaminated severely by Pb, Zn, and Cd. Dispersion patterns of heavy metals in those sediments are different according to their pollution source and sampling distance from the mine. The stream sediment pH is generally neutral in control area, and is slightly acidic in the lower part of tailing dam. The main pollution source of stream sediments was confirmed as tailing and mine drainage. Their pollution level depends mainly on inflowed water and distance from the mine. The tolerance index ranges from -0.9 to 0.7. The mode of occurrances of heavy metals in polluted stream sediment are identified as Fe-Mn oxides, organic bounded and carbonate-bounded compound which show high potential of bioavailablity.

퇴계의 「향입약조」 재구성

김상현(Kim, Sang-hyun) 대한철학회 2021 哲學硏究 Vol.157 No.-

퇴계의 「향입약조」는 율곡의 「해주일향약속」과 더불어 조선향약의 전형으로 평가받는다. 그래서 많은 연구자들이 퇴계의 향약을 연구하기 위해 『퇴계선생문집』에 수록되어 있는 「향입약조」를 분석하였다. 그런데 『퇴계선생문집』에 수록된 「향입약조」보다 퇴계의 향약 사상을 더 온전히 담고 있는 「향입약조」가 있다는 문제 제기가 등장했다. 『퇴계선생문집』본 「향입약조」에 대한 의문이 제기되자 이어서 몇몇 학자들은 『퇴계선생문집』이 간행될 때 퇴계 선생이 초안했던 「향입약조」의 조항 일부가 누락된 채 간행되었다는 주장을 제기하고 있다. 이렇듯이 『퇴계선생문집』본 「향입약조」가 퇴계의 향약 사상을 온전히 담고 있는 자료인지에 대한 논란이 일고 있다. 문제는 퇴계의 향약 사상을 온전히 담고 있는 「향입약조」가 무엇이냐에 대한 이견은 퇴계의 향약 사상이 정확히 무엇인지, 그것의 주요 특징은 무엇인지에 대한 논란을 낳을 수밖에 없다. 그런데도 학계에서는 아직도 이 문제에 대한 규명작업을 하고 있지 않다. 따라서 본 연구의 목적은 퇴계의 사상을 온전히 담고 있는 「향입약조」를 복원하는 것이다. 이와 같은 목적을 이루기 위해 우리는 다음과 같은 과정을 밟을 것이다. 먼저, 퇴계의 「향입약조」와 관련된 선행연구를 검토할 것이다. 다음으로 퇴계 향약이 조선향약의 핵심으로 자리잡는데 결정적 역할을 한 제자 김기의 향약과 퇴계의 향약과 매우 유사한 것으로 평가되는 호남의 양과동향약을 차례로 분석할 것이다. 이렇게 문헌적 탐구가 마무리되면, 마지막으로 퇴계의 사상 내부로 들어가 앞선 연구를 통해 복원한 「향입약조」조항들이 퇴계의 평소 지론과 얼마나 잘 부합하는지를 검토할 것이다. 이와 같은 연구를 통해 『퇴계선생문집』 간행시 누락되었던 벌목 3개 조항과 각 벌목의 세부 규정을 복원할 것이다. This thesis is intended to find Toegye’s Hyang-Lip-yak-jo(鄕立約條) which contains the ideas of Toegye’s Hyangyak entirely. To achieve this goal, we will take the following steps. First, we will review prior research related to Toegye’s Yang-Lip-yak-jo. Through this analysis, we will reveal that there are several types of Toegye’s Hyang-Lip-yak-jo. Next, we will analyze Kim-gi-hyangyak(金圻鄕約) which established Toegye’s Hyangyak as the core of Joseon-Hyangyak, and Yang-Gwa-dong-hyangyak(良苽洞鄕約) which is considered very similar to Toegye’s Hyangyak. When this literature research is completed, we will finally go inside the thought of Toegye and examine how well the previously restored provisions of Hyangyak fit with Toegye’s usual theory. Through this research process, we will restore three provisions of Penalty and the details of each Penalty provision, which were omitted in the publication of the TegyeseonsaengMunjib(退溪先生文集).

인천-개성 항로 바지 수송시스템 구축에 관한 기초적 연구

김상현,이승희,이영길,유진원,Kim, Sang-Hyun,Lee, Seung-Hee,Lee, Young-Gill,Yu, Jin-Won 해양환경안전학회 2008 海洋環境安全學會誌 Vol.14 No.3

Recently, the transport quantity of goods between South and North Korea is rising rapidly by increasing of economical exchange between South and North Korea and growth of Gaeseoung industrial complex. In addition to a land transportation route, it is necessary to secure various logistics and transportation route for freight transportation between Incheon and Gaesung. In this paper, we investigated a construction of barge transportaion system between Incheon and Gaesung. The barge transportation system which has many merits such as a little initial investment and convenience of harbor loading/ unloading has been also used to transport freight widely in the EU and USA. Firstly, we investigated barge transport route, marine freight and barge fleet which consists of barge and pusher between Incheon and Gaesung. And next, we designed hull form and general arrangement of a barge and pusher based on shipping service condition, barge fleet, etc. Finally, a construction plans of barge transport system such as a operation of shipping service, berthing facilities, logistics center, intermodal transport are investigated. 최근 남북한의 경제교류 증대 및 개성공단의 발전에 따라 남북한의 물동량은 급속히 증가하고 있다. 또한 인천과 개성 사이의 물류 수송을 위하여 육상수송뿐만이 아니라 다양한 물류 수송 및 수송로의 제공이 요구되고 있다. 이 논문에서는 인천과 개성 사이의 바지 운송시스템 구축에 대하여 고찰한다. 적은 초기 투자비용, 적하역 및 접안 편이성 등과 같은 유리한 점을 가진 바지 운송시스템은 유럽 및 미국 등에서 널리 사용되고 있다. 먼저 본 논문에서는 바지 운송 항로, 해상 물동량 및 바지와 푸셔로 구성되는 바지 선단 등에 대하여 고찰한다. 그 다음에 바지 해상항로 조건 및 바지 선단 등에 기초하여 바지 및 푸셔의 선형 및 일반배치 설계를 수행한다. 마지막으로 바지 항로 운영 방안, 적하역 시설, 물류 센터 및 복합 수송 등과 같은 바지 해상항로 구축 방안에 대하여 고찰한다.

당뇨황반부종의 빛간섭단층촬영 분류에 따른 유리체강내 트리암시놀론과 베바시주맙의 효과 비교

김상현,박정민,Sang Hyun Kim,Jung Min Park 대한안과학회 2010 대한안과학회지 Vol.51 No.2

Purpose: To compare the effect of single intravitreal injection of triamcinolone acetonide and bevacizumab for the treatment of diabetic macular edema by optical coherence tomography (OCT) patterns. Methods: We classified diabetic macular edema by three OCT patterns: Type 1, diffuse retinal thickening; Type 2, increased retinal thickness associated with the presence of intraretinal cystoid spaces (cystoid spaces with horizontal diameter >300 μm); and Type 3, serous macular detachment. According to this classification, 84 eyes of 42 patients with bilateral diabetic macular edema by the same OCT pattern participated in this study.In each patient,one eye was treated with a single intravitreal injection of bevacizumab 1.25 mg/0.05 ml (IVBI group) and the other eye with a single intravitreal injection of 4 mg/0.1 ml triamcinolone (IVTI group). A comprehensive ophthalmic examination was performed at baseline and at one, three and six months after treatment. Main outcome measures included best corrected visual acuity (logMAR) and central macular thickness measured with OCT. Results: In Type 1, central macular thickness (CMT) reduced significantly in the IVBI group at one month.In Type 2, mean BCVA and CMT improved significantly in the IVTA group at one and three months and in the IVBI group at one month following treatment. In Type 3, CMT reduced significantly in both groups at one, three and six months.However, BCVA did not significantly increase in either group at one, three or six months after treatment. Conclusions: The effects of one single intravitreal injection of triamcinolone and bevacizumab differ by OCT patterns in bilateral diabetic macular edema patients.The correct therapeutic method, depending on OCT patterns of macular edema, should result in better improvement of visual acuity. J Korean Ophthalmol Soc 2010;51(2):210-219

국외 인문사회의학 교육과정 현황

김상현,Kim, Sang Hyun 연세대학교 의과대학 2008 의학교육논단 Vol.10 No.1

Purpose: This study is purposed to analyze the curriculum on medical humanity and social science in foreign medical schools. The Main topics are classified into three parts: the characteristics of American medical humanity and social science curriculum: understanding of medical humanity and social science in medical school in USA, UK, and Australia: standard recommendations on medical ethics and professionalism in curriculum design. Methods: The literature reviews and on-line searching were conducted to collect the information and data on medical humanity and social science in foreign medical schools, 9 medical schools were selected in terms of reputations in USA, UK, and Australia. Results: First, American medical humanity and social science curriculum have changed, especially from cores to electives, from informal to formal and from subjects to interdisciplinary. In addition. teaching methods have changed into small-group discussion and teaching materials into various sources, such as essays, poetry, films and so forth. Second, most medical schools had their own unique curriculum adjusted to their academic traditions. Especially, curriculum of UK and Australia were more integrated than those of USA. Finally, it is recommended that standards of medical ethics and professionalism have to be considered in curriculum design. Conclusion: It is suggested that medical humanity and social science curriculum be designed closely connecting with clinical medicine.

이진화기반 영역분할을 이용한 3D입체영상의 밝기보정

김상현,김정엽,Kim, Sang-Hyun,Kim, Jeong-Yeop 한국정보처리학회 2011 정보처리학회논문지B Vol.18 No.5

본 논문에서는 이진화기반 영역분할을 이용한 3D입체영상의 밝기 보정방법을 제안한다. 제안된 방법은 입력된 좌우 3D입체영상 중 우 영상을 이진화를 통한 영역분할을 하고 크기가 작은 영역들은 제거한다. 다음 우 영상의 각 영역들에 대해 대응되는 좌 영상내의 영역을 상관계수(correlation coefficient)를 이용한 정합을 통해 추출한다. 영역단위의 매칭을 할 때 영역들 간의 겹침을 방지하기 위하여 모폴로지 필터로 영역경계에 인접한 일정부분을 제거한다. 그리고 좌우 영상의 영역 간 히스토그램 명세화를 수행함으로써 우 영상의 밝기 보정을 한다. 실험에서 좌 영상으로부터 블록단위 움직임보상으로 우 영상을 생성했을 때 제안한 방법이 블록평균 정합오차가 가장 작은 것을 확인 할 수 있었다. In this paper, we propose a method for intensity correction using binarization-based region segmentation in 3D stereoscopic images. In the proposed method, 3D stereoscopic right image is segmented using binarizarion. Small regions in the segmented image are eliminated. For each region in right image, a corresponding region in left image is decided through region matching using correlation coefficient. When region-based matching, in order to prevent overlap between regions, we remove a portion of the area closed to the region boundary using morphological filter. The intensity correction in left and right image can be performed through histogram specification between the corresponding regions. Simulation results show the proposed method has the smallest matching error than the conventional method when we generate the right image from the left image using block based motion compensation.