Hg1-xMnxTe 산화막의 홀효과에 관한 연구

이상찬(Sang Chan Lee),주유환(You Hwan Choi),최기영(Ki Young Choi),오재근(Jae Geun Oh),송재흥(Jae Hung Song),설정식(Chung Sik Sol),채건식(Kun Sik Chae),김영국(Young Kook Kim),손인호(In Ho Sohn),차성극(Seong K . Cha) 경남대학교 기초과학연구소 1996 慶南大學校 基礎科學硏究所 硏究報告 Vol.8 No.-

산학 연계 교육 : Base camp를 이용한 현장실습 활성화에 대한 연구

이상찬 ( Sang Chan Lee ),김종대 ( Jong Dae Kim ) 한국실천공학교육학회 2014 실천공학교육논문지 Vol.6 No.2

현재 대학에서 수행하고 있는 대표적인 산학협력 교육은 현장에서 직무능력을 향상시키기 위한 현장실습이다. 현장실습의 목적은 전문성을 훈련할 수 있는 기회를 제공하고 취업시장에서 경쟁력을 높이며 이론과 실무를 연계하는 것이다. 이러한 현장실습은 학생들의 실무능력을 증대하기 위해 진행되고 있지만 현장실습 업체와 참여 학생들의 능력에 따라 차이가 많이 발생한다. 심한 경우, 현장에서의 실습 수행이 어려워 단순작업에 학생들을 투입하는 현상이 발생한다. 이러한 현장실습의 문제점으로 인하여 본래의 현장실습의 취지를 달성하지 못하고 있는 실정이다. 이에 따라, 본 논문에서는 Base camp를 이용하여 현장실습의 대한 실습능력을 강화시키고 현장실습을 활성화 시킬 수 있는 방법을 제안하였다. Most important Industry-Academy cooperation program in university is field placement for increasing ability work. Purpose of field placement are to provide training opportunities and to increase competition in job market. But field placement may vary de-pending on the size of the industry and the students`` ability. In severe cases, some students did not practicing but simple work. So it is difficult to achieve the purpose of practical training. Thus, we propose a method for increasing field training ability and activation field placement using Base camp.

A Critical Study of the Popular View of the "Righteous Army Movement" of 1896

이상찬 ( Lee Sang-chan ) 서울대학교 규장각한국학연구원 1999 Seoul journal of Korean studies Vol.12 No.-

백굴채(白屈菜)가 Stomach Adenocarcinoma Cell Line의 Apoptosis에 미치는 영향

김상찬,이상태,김대준,변준석,Kim, Sang-Chan,Lee, Sang-Tae,Kim, Dae-Jun,Byun, Joon-Seok 대한한의학방제학회 2005 大韓韓醫學方劑學會誌 Vol.13 No.1

Chelidonii Herba (Baekgulchae in Korean: CHE), a commonly used herb in Korea, Japan and China, is widely used in the treatment of stomach cancer, jaundice, gastric ulcer, edema and pain of stomach. In the present study, we demonstrated that CHE induces apoptosis in AGS cells, human stomach adenocarcinoma cell line. One of the most important recent advances in cancer research is the recognition that apoptosis plays a major role in both tumor formation and treatment response, In this study, CHE caused a decrease of viability in AGC cells. When AGS cells were treated with CHE, cells showed dose-dependent manner apoptotic cell death. Increased apoptotic cell death, exposured to CHE, resulted from induction of Bad translocation to mitochondria, cytochrome-c release from mitochondria to cytosol, activation of caspase-3, 8, 9, and PARP cleavage. These results suggest that CHE may be potential therapeutic approach in the clinical management of stomach adenocarcinoma.

한방 설문과 생체신호 간 연관분석 모델

박상찬(Sang-Chan Park),이상철(Sang-Chul Lee),박영배(Young-Bae Park),임광혁(Kwang Hyuk Im) 한국콘텐츠학회 2013 한국콘텐츠학회논문지 Vol.13 No.3

본 연구는 한방에서 사용되는 설문데이터와 생체신호데이터를 활용한 분석을 통하여 설문데이터와 생체신호 간의 연관성을 탐색하여 고객 개개인마다 적합한 고객 맞춤형 한방 생체신호 측정을 가능케 하는데 목적이 있다. 먼저, 기 개발된 설문을 통해 수집된 설문데이터를 분석하여 변증을 판단할 수 있는 설문 문항만을 선발하여 최적화하였고, 이렇게 최적화된 설문데이터를 데이터마이닝 기법을 이용하여 변증이 있는 그룹과 없는 그룹으로 구분하였다. 각 그룹에 속한 고객들의 위전도 측정데이터를 수집·분석하여 설문과 생체신호 간 연관성을 분석하였고, 아울러 변증과의 연관성을 분석하였다. The purpose of this research is to analyze the questionnaire of oriental medicine and bio-signal data and to identify the correlation between symptoms of oriental medicine and bio-signal in order to develop the customization model for individual patients. First, this research analyzes the questionnaire data using the developed questionnaire for oriental medicine symptoms and selects the optimized questionnaires for identifying the symptoms. Using data mining technologies with the selected questionnaires, this research divides the normal group and the group with symptoms. Finally, this research identifies the correlation between the questionnaire for oriental medicine symptoms and electrogastrogram signal.

고속 직접분사식 디젤 엔진의 실린더내 유동 해석

박상찬,류재덕,이기형,Park, Sang-Chan,Ryu, Jae-Deok,Lee, Gi-Hyeong 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.9

Recently, HSDI (High Speed Direct Injection) diesel engine has been spotlighted as a next generation engine because it has a good potential for high thermal efficiency and fuel economy. This study was carried out to investigate the in-cylinder flow characteristics generated in a 4-valve small diesel cylinder head with a tangential and helical intake port. The flow characteristics such as coefficient of flow rate(Cf), swirl ratio (Rs), and mass flow rate (ms) were measured in the steady flow test rig using the impulse swirl meter and the analysis of in-cylinder flow field was conducted by experiment using the PIV and calculation using the commercial CFD code. As the results from steady flow test indicate, the mass flow rate of the cylinder head with a short distance between the two intake ports is increased over 13% than that of the other head. However, the non-dimensional swirl ratio is decreased approximately 15%. From in-cylinder flow characteristics obtained by PIV and CFD calculation, we found that the swirl center was eccentric from the cylinder center and the velocity distribution became uniform near the TDC. In addition, the results of the calculation are good agreement with the experimental results.

청원 소로리 토탄층에서 고대 볍씨와 함께 출토된 뿌리잎벌레류의 화석

남상찬,이성균,안승락,이융조,조수원,Nam, Sang-Chan,Lee, Seong-Kyun,An, Seung-Lak,Lee, Yung-Jo,Cho, Soo-Won 한국응용곤충학회 2008 한국응용곤충학회지 Vol.47 No.4

청주 근교 청원군 소로리의 토탄층에서 고대 볍씨에 관한 조사를 실시하던 중 다른 여러가지 유기물들과 함께 곤충의 파편으로 보이는 조각들이 함께 출토되었다. 비록 완전한 개체의 형태는 아니지만 딱정벌레의 외골격은 두껍고 단단해 지금까지 보존되어온 것으로 보인다. 그 중 일부는 종 수준까지의 동정도 가능하였는데, 앞날개의 형태 등을 기준으로 현세종과 비교 분석한 결과, Plateumaris sericea 및 Donacia flemola와 동일 또는 매우 근연한 종으로 동정되었다. 이들은 딱정벌레목(Coleoptera), 잎벌레과(Chrysomelidae), 뿌리잎벌레아과(Donaciinae)에 속하는 종류로, 습지식물인 사초과나 벼과 식물을 주로 가해하며, 유충기에는 물 속 뿌리부분을 가해하면서 수서생활을 한다. 그들의 상세한 생태적 정보를 바탕으로 할 때, 이러한 증거는 당시의 소로리 환경이 습지였음을 분명하게 증거하고 있음을 알 수 있다. 따라서, 고대 볍씨의 연구에 있어서 이들 곤충화석의 증거는 소로리의 당시 환경이 벼등 습지식물이 자라기 좋은 환경이었음을 말해주고 있다. During the excavation to find ancient rice seeds from the peat layer (12,500-14,800 bp based on 14 dating samples) of Soro-ri, Cheongwon-gun near Cheongju city, we found not only old rice seeds, but also other organic materials including insect fossil skeletons. Although no complete specimen was found in this study, some body parts were diagnotic enough for identifying species. Among the identified insect fossils, two species were successfully identified based on their characteristic forewing morphologies, e.g., cross-ridges on forewing. The two identified species, Plateumaris sericea and Donacia flemola or near, belong to Donaciinae in Chrysomelidae, and their larvae are known to feed on the root of wetland plants, mainly in Poaceae or Cyperaceae. Such finding proved that a wetland environment was maintained in Soro-ri at that time, and was suitable for such insects to survive. Therefore, evidence from the fossilized rice seeds, together with these insect fossils, clearly proved that the environment at that time was suitable for rice, a common Poaceae species, growing.

저가형 마이크로프로세서를 위한 연산처리 확장 모션제어 알고리즘

문상찬(Sang-Chan Moon),김재준(Jae-Jun Kim),남규민(Kyu-Min Nam),김병수(Byoung-Soo Kim),이순걸(Soon-Geul Lee) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.12

For precise motion control, S-curve velocity profile is generally used but it has disadvantage of relatively long calculation time for floating-point arithmetics. In this paper, we present a new generating method for velocity profile to reduce delay time of profile generation so that it overcomes such disadvantage and enhances the efficiency of precise motion control. In this approach, the velocity profile is designed based on the gamma correction expression that is generally used in image processing to obtain a smoother movement without any critical jerk. The proposed velocity profile is designed to support both T-curve and S-curve velocity profile. It can generate precise profile by adding an offset to the velocity profile with decimals under floating point that are not counted during gamma correction arithmetic operation. As a result, the operation time is saved and the efficiency is improved. The proposed method is compared with the existing method that generates velocity profile using ring buffer on a 8-bit low-cost MCU. The result shows that the proposed method has no delay in generating driving profile with good accuracy of each cycle velocity. The significance of the proposed method lies in reduction of the operation time without degrading the motion accuracy. Generated driving signal also shows to verify effectiveness of the proposed method.

보호 회로를 포함한 전력 MOSFET 구동기

한상찬,이순섭,김수원,이덕민,김성동,Han, Sang-Chan,Lee, Soon-Seop,Kim, Soo-Won,Lee, Duk-Min,Kim, Seong-Dong 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.2

본 논문에서는 2${\mu}m$ 고전압 CMOS 공정을 사용한 보호 회로를 포함한 전력 ,MOSFET 구동기를 설계하였다. 제어 회로의 안정한 동작을 위하여 전원 관리 회로를 설계하였으며 전원 관리 회로의 전압 레귤레이터의 보호를 위하여 전압 검출 방식의 단락 보호 회로를 제안하였다. 전압 검출 방식(Voltage-Detection Short Circuit Protection; VDSCP)은 직렬 저항에 의한 전압 강하가 없고, 출력단 단락 상태에서 전압원의 전류를 출력단에 흐르지 못하도록 하는 특성이 있다. 전력 MOSFET를 보호하기 위하여 부하 단락 보호회로, 게이트 전압 제한 회로, 과전압 보호 회로를 설계하였으며, 50V의 항목 전압을 닺는 공정을 이용하여 전력 MOSFET 구동기를 위한 2${\mu}m$ 고전압 CMOS 공정을 개발하였다. 전력 MOSFET이 소비하는 전력 이외에 구동기가 소비하는 전력은 전력 MOSFET 구동 상태에 따라 20 ~ 100mW의 범위에 있는 것으로 확인하였다. 주문형으로 제작된 전력 MOSFET 구동기의 active area의 크기는 $3.5 {\times}2..8mm^2$이다. In this paper, a power MOSFET driver with protection circuits is designed using a 2${\mu}m$ high-voltage CMOS process. For stable operations of control circuits a power managing circuit is designed, and a voltage-detecting short-circuit protection(VDSCP) is proposed to protect a voltage regulator in the power control circuit. The proposed VDSCP scheme eliminates voltage drop caused by a series resistor, and turns off output current under short-circuit state. To protect a power MOSFET, a short-load protection, a gate-voltage limiter, and an over-voltage protection circuit are also designed A high voltage 2 ${\mu}m$ technology provides the breakdown voltage of 50 V. The driver consumes the power of 20 ~ 100 mW along its operation state excluding the power of the power MOSFET. The active area of the power MOSFET driver occupies $3.5 {\times}2..8mm^2$.

프로젝션 용접을 이용한 쾌속조형법에서 공정변수의 실험적 해석

이상찬,박정남,Lee Sang-Chan,Park Jeong-Nam 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.2

Rapid Prototyping (RP) technology has helped successfully to reduce time and costs since first emerged in 1986. Recently, RP using functional materials like as metal have been researched. However RP using molten metal and brazing material have been struggling to resolve several drawbacks, such as dimensional inaccuracy, poor surface finish and post finishing because occurring shrinkage and warpage at cooling. So, the purpose of this study is to develop a new RP technique using sheet metal and projection welding for reducing several drawbacks in occurring RP using molten metal. And optimum process variables were determined using desist of experiment(DOE).