프리캠버에 사용된 인장재가 적용된 9m Cap Deck 합성슬래브의 구조성능

최성훈(Choi, Sung-Hoon),이승재(Lee, Seung-Jae),경제환(Kyung, Je-Hwan),송종욱(Song, Jong-Wook),최성모(Choi, Sung-Mo) 대한건축학회 2015 대한건축학회 학술발표대회 논문집 Vol.2015 No.-

부하패턴을 이용한 손실계수 산정 방법

최성훈(Seung-Hoon Choi),김준일(Joon-Eel Kim),박용업(Yong-Up Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.1

In order to establish the electric distribution system economically and operate efficiently, it becomes important to calculate energy losses of the system more accurately. This importance is not only related for the engineering of utilities’ power network but also for the consumers’ electric system. The Distribution Loss Factor (DLF) is the fundamental element of calculating the energy losses occurred through the electric system including the electric lines and equipments. Up to now, the DLF is calculated by empirical formulas using the correlation between the DLF itself and Load Factor. However, these methods have some limitations to reflect the various characteristics of the system and the load. In this regard, the novel method proposed here is developed to yield more accurate result of DLF which actively interacting with the characteristics and load patterns of the system. The improvement of accuracy is very significant according to the results of verification presented at the end of this paper.

수종의 대체골이 배양 섬유모세포의 세포독성에 미치는 영양에 관한 연구

최성훈(Seong Hoon Choi),엄인웅(In Woong Um),이동근(Dong Kuen Lee),김수남(Soo Nam Kim),민승기(Seung Ki Min) 대한구강악안면외과학회 1992 대한구강악안면외과학회지 Vol.18 No.1

Allplastic graft materials have been used for tissue graft materials as employed today originated in the last decades and he variety of corrosion-resistant materials increased markedly. This increase in types of materials and in applications has stemmed in large part from the surgeons desire for better results, for better aesthetic appearence, and for avoidance of the morbidity and pain associated with the second operation at the donor site to procure autogenous tissue. In this article, to compare the cytotoxicity of these materials, each collagen matrix, methylmethacylate, porous polyethylen and silicone were inserted to the culture media with fibroblast extracted form I.C.R. mouse and were incubated for 2, 4, 7 days respectively. The cytotoxicity was measured by the viable fibroblast cell numbers in the vicinity of the inserted material surface and compared with the normal control group. The results were as follows: 1. Cellular toxicity of the collagen matrix were lower than the other implant materials. 2. The highest cellular toxicity were recorded in methylmetacrylate, especially the living cells were not observed in adjacent to he implanted body. 3. Cellular toxicity of the porous polyethylene was extremely at fourth day of culture, but repaed at seventh day. 4. Cellular toxicity of the silicone did not showed initially, but appeared from fourth day and which was continued at seventh day with mild degree.

황흑산(黃黑散)의 메티실린 내성 황색포도상구균에 대한 항균 활성과 옥사실린과의 시너지 효과

최성훈 ( Sung-hoon Choi ),강옥화 ( Ok-hua Kang ),주전 ( Tian Zhou ),공룡 ( Ryong Kong ),이승진 ( Seung-jin Lee ),강담희 ( Dam-hee Kang ),정혜인 ( Hye-in Jung ),이영섭 ( Young-seob Lee ),권동렬 ( Dong-yeul Kwon ) 대한본초학회 2016 大韓本草學會誌 Vol.31 No.5

Objectives : Hwangheuk-san is a complex prescription composed of oriental traditional medicine and has been reported for antioxidant, antimicrobial and anticancer effects in the recent study. Methicillin-resistant Staphylococcus aureus (MRSA) is one of important causes of fatal infectious diseases such as septicemia, endocarditis, toxic shock syndrome, pneumonia, skin and soft tissue infections (SSTIs). S. aureus is reported as being for a variety of human diseases and its epidemiological relevance is mainly due to their ability of becoming highly resistant to common antimicrobials such as tetracycline, penicillin, cphalosporin and aminoglycoside. The objective of this study is to determine the antimicrobial effect of Hwangheuk-san ethanol extracts (HHS) and synergistic effects with antibiotics oxacillin against MRSA. Methods : The antimicrobial activity of HHS was measured by the disc diffusion method, broth microdilution method and the checkerboard dilution test, time-kill curve assay was performed to investigate synergistic effects with antibiotics oxacillin against MRSA. Results : HHS showed antimicrobial activity against MRSA with a MIC value of 125 ㎍/㎖. In the checkerboard test, the interaction of HHS with antibiotics oxacillin produced almost synergy or partial synergy against MRSA. This study showed that HHS reduced the MICs of oxacillin tested, and a remarkable antibacterial effect of HHS, with membrane permeability enhancers. Conclusions : These results suggest that HHS has the antimicrobial effect and synergistic effects with antibiotics oxacillin against MRSA. This study thus can be a valuable source for the development of a new drug with low MRSA resistance.

전기기계식제동장치용 감속기일체형모터의 최적설계방법 및 성능평가

백승구(Seung-Koo Baek),신지환(Ji-Hwan Shin),최성훈(Sung-Hoon Choi),김석원(Seog-Won Kim) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.12

고속철도차량에 장착되는 전기기계식 제동장치(EMB : Electro-Mechanical Brake, 이하 EMB)는 약 50 ~ 60 kN 수준의 제동압부력을 필요로 한다. 모터가 사용되는 EMB 구동부는 고토크 출력을 위해 높은 감속비를 필요로 하며 대차 설치로 인한 공간적인 제약 때문에 소형화 설계 및 운행 중 차량하부로부터 발생하는 진동으로 인한 내구성을 가져야 한다. 따라서, 감속기일체형모터(GM : Geared Motor, 이하 GM)의 설계 및 제작기술은 철도차량용 EMB 구동부의 신뢰성 향상을 위해 필요한 기술이다. 본 논문은 GM를 위한 모터 최적설계기법 및 감속기 구조를 다루었다. 모터는 매입형 영구자석 동기전동기(IPMSM : Interior Permanent Magnet Synchronous Motor, 이하 IPMSM)를 적용하였으며 최적설계기법으로 Plackett-Burmann(PB, 이하 PB)의 민감도 분석을 통한 반응표면분석법(RSM : Response Surface Methodology, 이하 RSM)을 적용하여 최적화설계를 수행하였다. 감속기는 유성기어와 베벨기어의 조합을 통한 동심형 축직각 감속기 형태를 통해 안전측(fail safety) 동작 기능을 갖도록 제안하였다. IPMSM의 최적화 설계를 통하여 초기 설계결과 대비 출력토크는 12% 상승하였으며, 모터축과 감속기의 동심축 연결을 통하여 부피는 25% 감소, 중량은 50% 감소하는 결과를 보였다. GM는 EMB에 설치하여 기본성능시험을 통한 가용성을 평가하였다. An Electro-Mechanical Brake (EMB) mounted on the bogie of a high-speed train (HST) requires about 50 ~ 60 kN clamping force for braking. The EMB driving unit using a motor needs a high reduction gear for high torque output. In addition, the EMB driving unit must be compact owing to the space constraints and need to withstand the vibrations generated from under the vehicle while it is operating. Therefore, the design and manufacture of a geared motor (GM) for improving the reliability of the EMB driving unit for HST are necessary. This paper deals with the motor optimal design method and reduction gear structure of the GM. As part of the design, an Interior Permanent Magnet Synchronous Motor (IPMSM) is used, and the optimization design was performed by applying Response Surface Methodology (RSM) using the Plackett-Burmann (PB) sensitivity analysis. The reduction gear is proposed to have a safety function through the concentric shaft perpendicular reducer using the combination of planetary and bevel gears. Through the optimized design of IPMSM, the output torque increased by 12% compared to the initial design. Simultaneously, the volume and weight had decreased by 25% and 50%, respectively, through the integrated connection of the motor shaft to the reducer. Finally, the GM was installed in EMB, and its availability was evaluated through a basic performance test.

고속철도차량의 인보드대차 적용을 위한 견인전동기의 설계 및 성능해석

백승구(Seung-Koo Baek),최성훈(Sung-Hoon Choi) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.10

본 논문은 고속철도용 인보드 대차에 적용하기 위한 견인전동기 시스템의 설계 프레임워크를 다룬다. 최근 유럽에서는 새로 제작되는 철도차량에 인보드 대차 시스템을 적용하는 사례가 늘어나고 있으나, 국내에서는 개발 및 적용 사례가 없다. 인보드 대차는 아웃보드 대차에 비해 차량 중량과 주행 저항을 줄일 수 있는 기술이다. 이러한 장점에도 불구하고, 차축에 설치되는 베어링이 차륜의 안쪽에 위치하기 때문에 대차의 내부 공간의 효율적 활용, 견인전동기와 감속기 간의 최적화 설계 및 개선된 인터페이스가 요구된다. 본 논문에서는 최고운영속도 400km/h를 위한 고속철도차량의 동적특성곡선 설계를 통한 견인전동기의 설계목표를 선정하고 동일 설계목표에 대한 기존 감속기(driving gear)를 통한 동력전달 구조와 직접구동모터의 두가지 설계를 제안하였다. 또한, 아웃보드 대차가 설치된 국내 차세대고속철도차량(HEMU-430X)의 유도전동기의 출력대비 40% 이상 출력 증가를 위해 매입형 영구자석 동기전동기 구조의 적용, 극수 증가 및 수냉식시스템 적용을 통한 설계 및 해석결과를 제시하였다. 설계된 견인전동기는 유한요소분석(FEA)을 통한 전기자계해석 상용 소프트웨어인 JMAG(Ver. 22.1, JSOL)을 활용한 해석결과로 설계 타당성을 보였다. This paper deals with a design framework for a traction motor system for inboard bogies for high-speed rail. Recently, there have been increasing cases of applying an inboard bogie system to newly manufactured trains in Europe, but there have been no cases of development and application in South Korea. Inboard bogies are a technology that can reduce vehicle weight and running resistance compared to outboard bogies. Despite these advantages, the bearings installed on the axle are located inside the wheel, so efficient use of the internal space of the bogie, optimized design, and improved interface between the traction motor and driving gear are required. In this study, a design goal was selected for the traction motor through dynamic characteristic curve design of a high-speed train (HST) for a maximum service speed of 400 km/h. A combined structure of a traction motor and driving gear, which are mainly used in the traction system for an HST, and a direct drive motor (DDM) are suggested for the same design goal. In addition, design and analysis results were obtained by applying an interior permanent magnet synchronous motor (IPMSM) structure, increasing the number of poles, and applying a water cooling system. The output was increased by more than 40% compared to the output of the induction motor of a domestic next-generation HST (HEMU-430X) with an outboard bogie. The designed traction motor showed design feasibility through analysis results using JMAG (Ver. 22.1, JSOL), which is commercial electromagnetic field analysis software that uses finite element analysis (FEA).

프리캠버 형성을 위한 7.5m 장스팬 Deep Deck 처짐실험

이승재(Lee, Seung-Jae),최성훈(Choi,Sung-Hoon),송종욱(Song, Jong-Wook),경제환(Kyung, Jae-Whan),최성모(Choi, Sung-Mo) 대한건축학회 2015 대한건축학회 학술발표대회 논문집 Vol.35 No.1

선캠버가 적용된 무동바리 9.0m Cap Deck 거푸집의 처짐 이력

이승재(Lee, Seung-Jae),최성훈(Choi, Sung-Hoon),송종욱(Song, Jong-wook),경제환(Kyung, Jae-Hwan),최성모(Choi, sung-Mo) 대한건축학회 2015 대한건축학회 학술발표대회 논문집 Vol.2015 No.-

중평리 농촌 어메니티 마스터플랜

김영표(Kim, Yeong-Pyo),최성훈(Choi, Seung-Hoon),임정우(Lim, Jung-Woo) 한국산림휴양복지학회 2013 한국산림휴양학회 학술발표회 자료집 Vol.2013 No.11

시상면 X-ray 기반 척추 유한요소 단순화 모델 생성 및 이의 신뢰성 검증

김철정(Cheol-Jeong Kim),최성훈(Sung Hoon Choi),손승민(Seung Min Son),유동만(Dongman Ryu),이치승(Chi-Seung Lee) 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.4

본 연구는 척추 전체 모델을 구현하기 위한 기초 연구로써 의료영상을 기반으로 전반적인 척추 형상을 단순화한 유한요소 모델을 생성하고 생성된 단순화 요추 모델의 신뢰성을 검증했다. 또한 골반 형상에 따른 대표 모델을 생성함으로써 다양한 척추 형상에 적용 가능함을 확인하였으며 이 중 기존의 유한요소해석 모델과 가장 유사한 척추 형상은 중립 골반 타입이다. 본 연구의 유한요소 모델은 기존의 3차원상에서 곡면까지 구현하는 방식이 아닌 2차원 X-ray 영상 기반으로 시상면 라인을 기반으로 단순화된 척추 모델을 생성했다. 단순화 척추 모델의 신뢰성을 검증하기 위해 인간 척추의 사체 실험에 수행된 동일한 조건의 외력을 본 연구의 유한요소 모델에 수행했다. 운동 범위 결과는 사체 실험 결과와 동일한 조건에서 3차원 의료영상 기반 유한요소 해석을 수행한 선행 연구 결과들을 비교를 통해 모델 신뢰성 검증을 수행했다. This study, as a basic study to implement the whole spine model, created a finite element model that simplified the overall spine shape based on medical images and verified the reliability of the generated simplified lumbar spine model. And by generating representative models according to the shape of the pelvis, it was confirmed that it can be applied to various spine shapes. Among them, the neutral pelvis (NP) type is the most similar to the existing finite element analysis model. The finite element model of this study created a simplified spine model based on the sagittal line based on the 2D X-ray images, rather than the conventional method of implementing a curved surface in 3D. In order to verify the reliability of the simplified spinal model, the external force under the same conditions performed on the human spine cadaver experiment was performed on the finite element model of this study. The range of motion results was compared with the results of previous studies that performed 3D medical image-based finite element analysis under the same conditions as the results of the cadaver experiment.