육미지황탕(六味地黃湯)으로 호전시킨 원발성 과수면장애 환자 1례(例)

김민상,유병찬,김종국,심재철,김종원,최영,김윤식,설인찬,오병열,Kim, Min-Sang,Yu, Byeong-Chan,Kim, Jong-Kook,Shim, Jae-Chul,Kim, Jong-Won,Choi, Young,Kim, Yoon-Sik,Seol, In-Chan,Oh, Byung-Yul 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.4

The most common causes of severe sleepiness beginning or progressively worsening in adults are SLEEP APNEA and RELATED BREATHING DISORDERS DURING SLEEP. Idiopathic hypersomnia is excessive sleeping without obvious cause. Idiopathic hypersomnia diagnosis can be explained as follows: One could be chronically sleepy due to either something wrong with sleep that makes it non-refreshing, or a problem with the brain mechanisms which normally should keep one alert whether caused by primary problems within the brain or its chemistry, or by other factors (such as sedating medications or thyroid problems). A 71-year-old male who had suffered from excessive sleeping was admitted to our department for oriental treatment on 7th of July, 2003. He was diagnosed as an idiopathic hypersomnia for excessive sleeping without obvious cause. Initial treatment modalities with administration of "SoonHwanGi1HoBang(循環器1號方)" were not effective. However, after administration of "YukMiGiHwangTang(六味地黃湯)" desirable effects were seen.

체감형 가상현실 H/W 기술 동향

김민상,성낙준,최유주,홍민,Kim, Min-Sang,Seong, Nak-Jun,Choe, Yu-Ju,Hong, Min 한국정보처리학회 2018 정보처리학회지 Vol.25 No.2

측정 데이터를 이용한 빔형성기의 적용에 의한 수중 채널 환경에서의 상관 대역폭 분석

김민상,조대영,김계원,이태석,박종원,임용곤,고학림,Kim, Min-Sang,Cho, Dae-Young,Kim, Kye-Won,Lee, Tae-Seok,Park, Jong-Won,Lim, Yong-Gon,Ko, Hak-Lim 한국융합신호처리학회 2014 융합신호처리학회 논문지 (JISPS) Vol.15 No.4

수중 채널 환경에서 고속의 데이터를 신뢰성 있게 전송하기 위한 OFDM 시스템에 대한 연구가 활발히 진행 중이다. 또한, OFDM 통신 시스템에서는 각 부반송파의 대역폭을 채널의 상관 대역폭 보다 작게 설정해야지만 수중 채널 환경에 OFDM 통신의 적용에 의한 성능 향상을 기대할 수 있다. 하지만 실제의 수중 채널 환경에서의 상관 대역폭은 수십 Hz로 매우 작기 때문에, 수중 OFDM 통신 시스템 구성 시에 OFDM을 위한 FFT의 크기가 증가하고, 각 부반송파에 실효 지연 확산 이상의 길이를 갖는 주기적 전치 부호를 추가해야하기 때문에 시스템의 복잡도가 증가하고 데이터의 효율이 저하된다. 따라서 본 연구에서는 수중 채널 환경에서 빔형성기의 적용에 의한 상관 대역폭의 증가를 연구하였다. 이를 위해 실제의 수중 채널 환경에서 측정을 수행하고, 측정 데이터를 분석해 봄으로써 수중 채널 환경에서 빔형성기의 적용에 의한 상관 대역폭의 증가 정도를 분석하였다. 분석 결과 수중 채널 환경에 빔형성기를 적용하는 경우 상관대역폭이 단일 센서를 사용하는 경우에 비해 크게 증가함을 알 수 있었다. The OFDM system have been widely studied for the purpose of increasing data rate with more reliable communications in underwater channel environments. And it is possible only when the sub-carrier's bandwidth is smaller than the coherence bandwidth of channel in the underwater OFDM communication system. However, the size of the FFT for the OFDM system will be increased because the coherence bandwidth is as small as several tens of Hz in real underwater channel environments. Also, It is necessary to add a CP having a length longer than the rms delay spread of a channel. So the complexity of the system is increased and the data efficiency is reduced. Therefore, in this paper, we have studied the increase of the coherence bandwidth by adapting the beamforming technologies. To do this, we have collected data from real underwater channel environments and analyzed the coherence bandwidth when adapting the beamforming technologies. Analyzing the experimental data show that the coherence bandwidth by the beamforming technologies in underwater channel environments was greatly increased compared to that of a single sensor.

남해 실해역 시험 기반 수중음향채널 경로손실에 관한 연구

김민상,이태석,조용호,임태호,고학림,Kim, Min-Sang,Lee, Tae-Seok,Cho, Yong-Ho,Im, Tae-Ho,Ko, Hak-Lim 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.3

최근 수중 자원개발, 재난 감시 및 국방에 관련하여 수중 통신에 대한 연구가 활발히 진행 중이다. 무선통신 시스템 설계에서 경로손실은 주어진 통신 링크에 대한 수신 전력 레벨을 계산하여 통신 신뢰성을 보장하는데 필요한 링크 예산을 도출하기 위한 중요한 정보이다. 수중음향채널은 각 해역에 따라 수온, 수심, 파고, 조류, 탁도 등에 의해 서로 다른 특성을 보이며, 각 해역별 수중음향채널의 경로손실은 서로 다른 특성을 갖는다. 따라서 수중음향 통신 시스템개발을 목적으로 하는 전 세계의 여러 연구기관에서는 다양한 해역에서 수중음향채널에 대한 연구가 활발히 진행되고 있다. 하지만 국내는 아직까지 수중음향채널의 경로손실에 대한 연구결과가 매우 부족하다. 따라서 본 연구에서는 남해 거제도 천해역의 실해역 측정을 통해 경로손실을 추정하였으며, 기존 연구에서 제안한 경로손실 수식에 남해의 환경정보를 적용하여 도출한 결과를 비교하여 그 차이를 확인하였다. Recently, studies on underwater communication, related to the development of underwater resources, disaster monitoring and defense, have been actively carried out. In the design of wireless communication systems, path loss is the most important information to derive a link budget that is required to guarantee communication reliability by calculating received power level for the given communication link. The underwater acoustic channel have different characteristics according to geographical location and relevant environmental factors such as water temperature, depth, wave height, algae, and turbidity. Subsequently, many research institutes aiming to develop underwater acoustic communication systems are researching actively on the underwater acoustic channels in various sea areas. In Korea, however, studies on the path loss of the acoustic channel are still insufficient. Therefore, in this study, the path loss of the acoustic channel are studied based on measurement data of the at-sea experiment conducted at Geohae-do, southern sea of Korea.

저온 브레이징용 Al-Si-Cu 합금의 Sn 첨가에 따른 융점 및 기계적 특성 변화 연구

김민상,박천웅,변종민,김영도,Kim, Min Sang,Park, Chun Woong,Byun, Jong Min,Kim, Young Do 한국재료학회 2016 한국재료학회지 Vol.26 No.7

For the development of a low-melting point filler metal for brazing aluminum alloy, we analyzed change of melting point and wettability with addition of Sn into Al-20Cu-10Si filler metal. DSC results showed that the addition of 5 wt% Sn into the Al-20Cu-10Si filler metal caused its liquidus temperature to decrease by about 30 oC. In the wettability test, spread area of melted Al-Cu-Si-Sn alloy is increased through the addition of Sn from 1 to 5 wt%. For the measuring of the mechanical properties of the joint region, Al 3003 plate is brazed by Al-20Cu-10Si-5Sn filler metal and the mechanical property is measured by tensile test. The results showed that the tensile strength of the joint region is higher than the tensile strength of Al 3003. Thus, failure occurred in the Al 3003 plate.

OpenGL과 Unity간의 GPU를 이용한 Particle Simulation의 성능 비교

김민상,성낙준,최유주,홍민,Kim, Min Sang,Sung, Nak-Jun,Choi, Yoo-Joo,Hong, Min 한국정보처리학회 2017 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.6 No.10

최근 GPGPU를 이용하여 저하된 컴퓨터 성능 향상폭을 높일 수 있게 되었고, 이로 인하여 높은 연산을 요구로 하는 물리 기반의 실시간 시뮬레이션을 PC에서 구동할 수 있게 되었다. 물리 시뮬레이션에서 적용되는 물리 계산은 병렬 처리로 수행되어질 수 있으며, 최근 OpenGL 4.3 및 Unity4.0에서 지원되는 Compute shader를 통한 병렬 연산을 이용하면 효율적으로 구동할 수 있다. 본 논문에서는 다양한 플랫폼을 지원하는 디지털 콘텐츠 제작 툴인 Unity와 다양한 플랫폼에서 구동되어지는 OpenGL에서의 실시간 물리 시뮬레이션에서의 성능을 측정 및 비교한다. 본 논문에서 particle 시뮬레이션의 실험 결과 Unity를 이용한 particle 시뮬레이션이 OpenGL을 이용한 particle 시뮬레이션에 비해 최대 136.04% 빠른 성능을 보인다. 이를 통하여 추후 멀티 플랫폼을 지원하는 디지털 콘텐츠를 제작함에 있어 더 나은 개발 도구를 선정할 수 있을 것으로 기대된다. Recently, GPGPU has been able to increase the degradation of computer performance, and it is now possible to run physically based real-time simulations on PCs that require high computational complexity. Physical calculations applied in physics simulation can be performed by parallel processing, and can be efficiently performed using parallel computation using Compute shader recently supported by OpenGL 4.3 and Unity 4.0. In this paper, we measure and compare the number of performance in real - time physics simulation in OpenGL running on various platforms and Unity, a content creation tool supporting various platforms. Particle simulation experiments show that particle simulation using Unity performs faster than 136.04%. It is expected that it will be able to select better development tools for future multi - platform support.

The Influence of Nutritional Assessment on the Outcome of Ostomy Takedown

김민상,Ho Kun Kim,Dong Yi Kim,Jae Kyun Ju 대한대장항문학회 2012 Annals of Coloproctolgy Vol.28 No.3

Purpose: Ostomy takedown is often considered a simple procedure without intention; however, it is associated with significant morbidity. This study is designed to evaluate factors predicting postoperative complications in the ostomy takedown in view of metabolism and nutrition. Methods: A retrospective, institutional review-board-approved study was performed to identify all patients undergoing takedown of an ostomy from 2004 to 2010. Results: Of all patients (150), 48 patients (32%; male, 31; female, 17) had complications. Takedown of an end-type ostomy showed a high complication rate; complications occurred in 55.9% of end-type ostomies and 15.7% of loop ostomies (P <0.001). Severe adhesion was also related to a high rate of overall complication (41.3%) (P = 0.024). In preoperative work-up,ostomy type was not significantly associated with malnutrition status. However, postoperatively severe malnutrition level (albumin < 2.8 mg/dL) was statistically significant in increasing the risk of complications (72.7%, P = 0.015). In particular,a significant postoperative decrease in albumin (> 1.3 mg/dL) was associated with postoperative complications, particularly surgical site infection (SSI). Marked weight loss such as body mass index downgrading may be associated with the development of complications. Conclusion: A temporary ostomy may not essentially result in severe malnutrition. However, a postoperative significant decrease in the albumin concentration is an independent risk factor for the development of SSI and complications. Purpose: Ostomy takedown is often considered a simple procedure without intention; however, it is associated with significant morbidity. This study is designed to evaluate factors predicting postoperative complications in the ostomy takedown in view of metabolism and nutrition. Methods: A retrospective, institutional review-board-approved study was performed to identify all patients undergoing takedown of an ostomy from 2004 to 2010. Results: Of all patients (150), 48 patients (32%; male, 31; female, 17) had complications. Takedown of an end-type ostomy showed a high complication rate; complications occurred in 55.9% of end-type ostomies and 15.7% of loop ostomies (P <0.001). Severe adhesion was also related to a high rate of overall complication (41.3%) (P = 0.024). In preoperative work-up,ostomy type was not significantly associated with malnutrition status. However, postoperatively severe malnutrition level (albumin < 2.8 mg/dL) was statistically significant in increasing the risk of complications (72.7%, P = 0.015). In particular,a significant postoperative decrease in albumin (> 1.3 mg/dL) was associated with postoperative complications, particularly surgical site infection (SSI). Marked weight loss such as body mass index downgrading may be associated with the development of complications. Conclusion: A temporary ostomy may not essentially result in severe malnutrition. However, a postoperative significant decrease in the albumin concentration is an independent risk factor for the development of SSI and complications.

해양통신망 국제표준화 및 기술동향연구

김민상(Kim Min Sang),김계원(Kim Kye Won),차민혁(Cha Min Hyuk),김준호(Kim Jun Ho),박종원(Park Jong Won),임용곤(Lim Yong Gon),고학림(Ko Hak Lim) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.1

Wideband VHF 통신용 FMT 빔 형성기 연구

김민상(Kim Min-Sang),김준호(Kim Jun-Ho),김계원(Kim Kye-Won),박종원(Park Jong-Won),임용곤(Lim Yong-Gon),고학림(Ko Hak Lim) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.6

액체산소/에탄올 엔진 연소시험 설비 구축 및 예비 운영 시험

김민상(Minsang Kim),전준수(Junsu Jeon),김태완(Taewoan Kim),우희찬(Heechan Woo),고영성(Youngsung Ko),김선진(Sunjin Kim),김승한(Seunghan Kim) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.5

본 연구에서는 향후에 다양한 목적으로 사용될 수 있는 액체산소/에탄올 추진제 조합의 로켓 엔진 연소시험 설비를 구축하고, 이 설비에 대한 운용 능력을 평가하기 위하여 예비 운영 시험을 수행하였다. 추진제는 가압 방식에 의해 공급되며, 이를 위해 고압용 추진제 탱크와 가압 및 공급 설비를 구축하였다. 그리고 다중 분사기 엔진을 설계/제작하였으며, 수류시험과 실유체 분무 시험을 통해 이 엔진의 분무 특성과 유량 공급 특성을 관찰하였다. 최종적으로 연소시험을 통하여 액체산소/에탄올 엔진과 연소시험 설비의 안정성을 검증하였다. In this study, LOx/Ethanol rocket engine combustion test facility was constructed which can be used for various purpose in the future and preliminary operational tests were performed to evaluate the operational capability. The facility consists of run tanks, pressurization and supply system. Also a multi injector rocket engine was designed and manufactured and the engine’s cold flow and propellents spray tests were performed to observe spray and supply characteristics as well. Finally, stability of the LOx/Ethanol engine and combustion test facility were verified by combustion tests.