http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Glufosinate ammonium 중독 후에 발생한 해마 손상에 의한 선행성 기억상실 1례
설승환,박현수,안정환,박희영,이필휴,김기운,Seol Seung-Hwan,Park Hyeon-Soo,Ahn Jung-Hwan,Park Hee-Young,Lee Phil-Hyu,Kim Gi-Woon 대한임상독성학회 2006 대한임상독성학회지 Vol.4 No.1
Glufosinate ammonium (GLA), a phosphinic acid derivate of glutamate, is a broad-spectrum contact herbicide. It structurally resembles glutamate, a typical excitatory amino acid in the central nervous system. In korea, the ingestion of GLA for suicidal attempt or accidental event has increased. The neurological complication of GLA intoxication are characterized by loss of consciousness, convulsion, or memory impairment. But, the exact mechanism of GLA toxicity is yet unknown. This report is about a patient with GLA intoxication who showed anterograde amnesia with selective bilateral hip-pocampal lesions supported GLA intoxication with literature reviews supported.
설승환,이호준,김용철,김완진,정재학,Seol, Seunghwan,Lee, Hojun,Kim, Yongcheol,Kim, Wanjin,Chung, Jaehak 한국음향학회 2022 韓國音響學會誌 Vol.41 No.2
Covert Underwater Communication (CUC) signals should not be detected by other unintended users. Similar to the method used in Radio Frequency (RF), covert communication technique sending information underwater is designed in consideration of the characteristics of Low Probability of Detection (LPD) and Low Probability of Intercept (LPI). These conventional methods, however, are difficult to be used in the underwater communications because of the narrow frequency bandwidth. Unlike the conventional methods of reducing transmission power or increasing the modulation bandwidth, a method of mimicking the acoustic signal of an underwater mammal is being studied. The biomimetic underwater acoustic communication mainly mimics the click or whistle sound produced by dolphin or whale. This paper investigates biomimetic communication method and introduces research trends to understand the potential for the development of such biomimetic covert underwater acoustic communication and future research areas.
다중 채널 융합 기법을 이용한 DTV 기반 수동형 레이다의 표적 인식 방법
설승환(Seung-Hwan Seol),최영재(Young-Jae Choi),최인식(In-Sik Choi) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.10
본 논문에서는 DTV(Digital Television) 기반의 수동형 레이다와 다중 채널 융합 기법을 이용한 항공기 표적 인식 방법을 제안하였다. DTV에서 송신되는 다수의 채널을 융합하여 표적인식에 필요한 해상도의 HRRP(High Resolution Range Profile)를 획득하였다. HRRP는 AR(Auto Regressive) 기법 또는 제로 패딩 기법을 이용하여 획득하였다. 획득한 HRRP로부터, 경사하강법을 이용한 CLEAN 기법을 통해 산란점을 추출한 후 특성벡터를 생성하였으며, 이를 신경망 구분기에 학습시켜 표적 인식을 수행하였다. 제안된 방법의 성능을 검증하기 위하여 실제 국내에서 운용되고 있는 3개의 송신소(관악산, 용문산, 견월악)의 주파수 대역을 가정하고, 4종의 항공기 실스케일 3D 캐드 모델을 이용하여 제안된 방법과 각 송신소의 단일 채널 주파수를 이용하였을 때의 표적인식 성능을 비교하였다. 시뮬레이션 결과, 제안된 방법이 3개의 송신소 모두에서 각 송신소의 단일 채널 주파수를 이용하였을 때보다 높은 표적 인식 성능을 보였다. In this paper, we proposed airborne target recognition using multi-channel combining method in DTV-based passive radar. By combining multi-channel signals, we obtained the HRRP with sufficient range resolution. HRRP was obtained by AR method or zeropadding. From the obtained HRRP, we extracted scattering centers by CLEAN algorithm using the gradient descent. We extracted feature vectors and performed target recognition after training neural network using the extracted feature vectors. To verify performance of proposed methods, we assumed frequency bands of three broadcasting transmitters operated in Korea(Mt. Gwan-ak, Mt. Yong-moon, Kyeon-wol-ak) and used full scale 3D CAD model of four targets. Also we compared the target recognition performance of the proposed method with that of using only single-channel of three broadcasting transmitters. As a result, proposed methods showed better performance than using only single-channel at three broadcasting transmitters.
개방성 치조골 골절의 고정법: 응급실에서 간편하게 적용할 수 있는 방법
설승환 ( Seung Hwan Seol ),차수현 ( Soo Hyun Cha ),최상천 ( Sang Cheon Choi ),안정환 ( Jung Hwan Ahn ),김기운 ( Gi Woon Kim ),최혜경 ( Hea Kyung Choi ),조준필 ( Joon Pil Cho ),정윤석 ( Yoon Seok Jung ) 대한외상학회 2007 大韓外傷學會誌 Vol.20 No.2
Purpose: The purpose of this clinical trial was to evaluate the fixation method for treating alveolar fractures in an emergency department. Methods: The efficiency of using the fixation method was judged on the basis of clinical criteria. Stability, occlusion state, bleeding amount after fixation, operation time, and difficulties during procedural operation were recorded. Results: Eight patients were enrolled in this study. In all instances, the fixation method was effective in bleeding control. Each patient had a noticeable decrement in bleeding. A wire was used for four of the eight patients, and nylon strings was used for the others. The average operation time was 6.3 minutes for the wire patients and 2.8 minutes for the Nylon string patients. No specific problem was identified during the procedural operation. However, the difference in the fixation material influenced the effectiveness of the procedure, the operation time, and the satisfaction of the doctor. Conclusion: In the emergency department, the fixation method using wire or nylon string in the treatment of alveolar fractures is effective in bleeding control (J Korean Soc Traumatol 2007;20:72-76)
생체모방 은밀 수중통신을 위한 머신러닝 기반 수중 채널 추정 방법
설승환(Seol Seung Hwan),이호준(Lee Ho Jun),김용철(Kim Yong Cheol),김완진(Kim Wan Jin),정재학(Chung Jae hak) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문에서는 생체모방 은밀 수중통신을 위한 머신러닝 기반의 수중 채널 추정 방법을 제안하였다. 돌고래 휘슬 모방 신호가 낮은 주파수 대역을 가지는 경우 수중 채널을 알 수 있다면 통신 성능을 높일 수 있다. 이를 위해 수중 채널을 추정하는 방법으로 머신러닝을 통해 수중에서의 수직 음속구조를 이용하여 수중 채널을 추정한다. 실제 해상 실험에서 얻은 수중 채널과 추정한 수중 채널이 유사함을 전산 모의실험을 통해 보였다.