수중 환경 정보 DB 기반 준-정적 수중음향 채널 수중음향 탐지 효과도 분석 모의 도구 구현

김장은(Jang Eun Kim),한동석(Dong Seog Han) 대한전자공학회 2015 전자공학회논문지 Vol.52 No.10

수중음향 채널환경에서 운영되는 검파시스템 성능분석은 실험의 제약으로 인해 모의 도구를 활용하여 시스템 성능을 결정한다. 본 논문은 수중음향 채널에 대한 탐지 효과도 분석을 위하여 수중환경 데이터베이스를 기반 수중음향 탐지 효과도 분석모의 도구를 제안한다. 먼저, HYCOM 수중환경 데이터베이스 기반으로 수중 환경을 구축하고, 음선이론을 이용하여 수중음향전달 경로/음압 계산을 통한 다중경로 지연 특성을 고려하였다. 또한, 실 환경에서 발생하는 수중 잡음 특성을 반영하기 위해 운용 주파수에 따른 수중청음기/수중음향 채널 잡음 특성인 열잡음/수중 주변 잡음을 적용하였다. It is difficult to test a detection system in underwater acoustics channel environments. The system can be evaluated by using simulation analysis tool. In this paper, a simulation tool is proposed to analyze the effectiveness of underwater acoustics detection based on database for real environments. First, the underwater environment is built based on HYCOM underwater environment database. Then, a multipath characteristic is considered through calculating underwater acoustics propagation path/pressure based on the ray theory. Also, hydrophone thermal noise and underwater ambient noise are considered to reflect underwater noise characteristics.

[지정토론문] 환자연명의료결정법의 제정과 과제

김장한(Kim, Jang-Han) 한국법학원 2017 저스티스 Vol.- No.158-3

공공 빅데이터를 이용한 폭염 취약성 지수 개발에 관한 연구

김장경(Kim, Jang-Gyeong),정창삼(Jeong, Chang-Sam),권현한(Kwon, Hyun-Han) 대한토목학회 2019 대한토목학회 학술대회 Vol.2019 No.10

ISO/IEC/IEEE 15288 기반 양산단계 무기체계 부품국산화 체계공학 개발관리 절차 적용 연구

김장은 ( Jang Eun Kim ),심보현 ( Bo Hyun Shim ),조유습 ( Yu Seup Cho ),성인철 ( In Chul Sung ),한동석 ( Dong Seog Han ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.3

Purpose: In this study, we propose that how to approach a effective system engineering and optimize system engineering management process for the mass production weapon system parts localization development process and success in DTaQ. Methods: To approach a effective system engineering for the mass production weapon system parts localization, we analyze a weapon system acquisition process and system engineering process of Republic of Korea and DTaQ parts localization business regulations in advance. after results of analysis of them, we implement a optimized parts localization development system engineering based on ISO/IEC/IEEE 15288. Results: In order to apply International Standard ISO/IEC/IEEE 15288 to the mass production weapon system parts localization development process, we compare the mass production weapon system parts localization acquisition environment with ISO/IEC/IEEE 15288 and analyze them. therefore, It is possible to implement a part of concept stage and development stage of ISO/IEC/IEEE total life cycle stage for the mass production weapon system parts localization development process. To achieve the technical review milestones of DTaQ parts localization business regulations in the selected stages of ISO/IEC/IEEE, the development and management agency perform 2 high rank process and 19 low rank process specified in ISO/IEC/IEEE. Conclusion: When the development and management agency perform the mass production weapon system parts localization development using the proposed system engineering approach, they should easily meet milestone through the clarified requirement and simplified System Engineering output documents in limited development period.

Bayesian MBLRP 모형을 이용한 시간강수량 모의 기법 개발

김장경,권현한,김동균,Kim, Jang Gyeong,Kwon, Hyun Han,Kim, Dong Kyun 대한토목학회 2014 대한토목학회논문집 Vol.34 No.3

추계학적 강수발생 및 모의기법은 수문학적 모형의 입력 자료로써 널리 이용되고 있다. 그러나 Modified Bartlett-Lewis Rectangular Pulse(MBLRP)와 같은 추계학적 포아송 클러스터 강수생성 모형에 대해서 국부최적화 방법을 통한 매개변수 추정 방법은 매개변수의 신뢰성에 상당한 영향을 주는 것으로 알려져 있다. 최근에는 MBLRP 모형의 국부해추정 문제를 해소하기 위하여 Particle Swarm Optimization (PSO) 또는 Shuffled Complex Evolution developed at The University of Arizona (SCE-UA) 등 매개변수 추정 성능이 우수한 전역최적화기법이 도입되고 있지만, 제한된 매개변수 공간에서 항상 신뢰성 있는 매개변수 추정이 가능한 것은 아니다. 뿐만 아니라, 모형의 매개변수들이 갖고 있는 불확실성에 관한 연구는 아직 충분히 논의되지 않았다. 이러한 관점에서 본 연구는 Bayesian 기법과 연계한 MBLRP 모형을 개발하였으며 각 매개변수들의 사후분포(Posterior Distribution)를 유도하여 매개변수가 내포하는 불확실성을 정량적으로 평가하였다. 그 결과 관측값에 대한 시간단위 이하 강수발생 통계치를 효과적으로 복원하고 있음을 확인할 수 있었다. Stochastic rainfall generators or stochastic simulation have been widely employed to generate synthetic rainfall sequences which can be used in hydrologic models as inputs. The calibration of Poisson cluster stochastic rainfall generator (e.g. Modified Bartlett-Lewis Rectangular Pulse, MBLRP) is seriously affected by local minima that is usually estimated from the local optimization algorithm. In this regard, global optimization techniques such as particle swarm optimization and shuffled complex evolution algorithm have been proposed to better estimate the parameters. Although the global search algorithm is designed to avoid the local minima, reliable parameter estimation of MBLRP model is not always feasible especially in a limited parameter space. In addition, uncertainty associated with parameters in the MBLRP rainfall generator has not been properly addressed yet. In this sense, this study aims to develop and test a Bayesian model based parameter estimation method for the MBLRP rainfall generator that allow us to derive the posterior distribution of the model parameters. It was found that the HBM based MBLRP model showed better performance in terms of reproducing rainfall statistic and underlying distribution of hourly rainfall series.

혈청 펩시노겐치를 이용한 위암 및 위선종의 집단검진

김장락,최진학,김영채,이옥재,조규일,이한우,홍대용,Kim, Jang-Rak,Choi, Jin-Hak,Kim, Young-Chai,Lee, Ok-Jae,Cho, Kyu-Il,Lee, Han-Woo,Hong, Dae-Yong 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.4

To evaluate the validity of serum pepsinogen levels as a screening tool for gastric cancer and adenoma, immunoradiometric assays of serum pepsinogen I level (PG I), II level (PG II) and esphagogastroduodenal endoscopies were done in 757 health examinees. Serum PG I level was higher in subjects with active duodenal ulcer (n=45, $75.2{\pm}34.3{\mu}g/l(mean{\pm}standard\;deviation)$, p<0.01) and gastroduodenal ulcers (n=8, $75.6{\pm}19.8{\mu}g/l$, p<0.05), and was lower in those with gastric adenoma(n=4, $37.7{\pm}37.2{\mu}g/l$, p<0.2) than those with normal, mild gastritis findings or ulcer scars (n=378, $56.6{\pm}24.9{\mu}g/l$. Serum PG II level was higher in subjects with active duodenal ulcer($17.2{\pm}13.8{\mu}g/l$, p<0.2), active gastro-duodenal ulcers ($18.3{\pm}7.4{\mu}g/l$, p<0.2) and gastric carcinoma (n=3, $23.8{\pm}10.9{\mu}g/l$, p<0.05) than those with normal, mild gastritis findings or ulcer scars $(14.5{\pm}7.9{\mu}g/l)$. Serum PG I/PG II ratio was higher in subjects with active duodenal ulcer($5.1{\pm}1.6$, p<0.05) and was lower in those with chronic gastritis(n=107, $4.1{\pm}1.7$, p<0.05), gastric polyp(n=19, $3.9{\pm}1.4$, p<0.2), gastric adenoma(n=4, $2.1{\pm}1.9$, p<0.01) and gastric carcinoma(n=3, $2.7{\pm}1.2$, p<0.1) than those with normal, mild gastritis findings or ulcer scars ($4.5{\pm}1.7$). Serum PG II level increased with age until 6th decade, whereas serum PG I/PG II ratio decreased with age in 378 subjects with normal, mild gastritis findings or ulcer scars. The screening criteria of serum PG I<$70{\mu}g/l$ and PG I/PG II ratio<3.0 for detecting gastric cancer and adenoma gave a positive rate of 15.7%, sensitivity of 57.1% and specificity of 84.7%.

유비쿼터스 환경에서 미디어 재생기법

김장하(Jang-ha Kim),이동훈(Dong-hoon Lee),박한성(Han-sung Park),김상욱(Sang-wook Kim) 한국정보과학회 영남지부 2003 한국정보과학회 영남지부 학술발표논문집 Vol.11 No.1

Ag nanoparticles을 이용한 GeSe 기반 ReRAM 소자의 저항변화 특성

김장한(Jang-Han Kim),유진욱(Jin-Wook Yoo),김지윤(Ji-Yoon Kim),박민영(Min-Young Park),이호연(Ho-Yeon Lee),박세훈(Se-Hun Park),고일환(Il-Hwan Ko),김진오(Jin-oh Kim),송상욱(Sang-Wook Song),양영모(Young-Mo Yang),정홍배(Hong-Bay Chung) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11

유전 역학적 연구와 생명윤리 및 개인정보 보호

김장한(Jang Han Kim) 한국역학회 2007 Epidemiology and Health Vol.29 No.1

  Unlike the classical genetic study which dealt with the mendelian inheritances of relatively small number of patients, the genetic epidemiology study needs the large scaled genetic data base. The main ethical and legal problems of these kinds of studies are research design, informed consent, long term follow-up of research subjects, data sharing and benefit sharing. Classically, the informed consent was an important right but if these kinds of large scaled and long period studies were involved, the newly developing rights should be more stressed. The bioethics and biosafety act and governmental regulations for the genetic study and gene bank also shows those considerations.   In EU, the general consent is considered acceptable if the approval of all future projects is fulfilled by a research ethics committee and the participants" right to withdraw samples at any times. In U.S.A., strict restriction is required for future experiments, but if the research involves no more than minimal risk to the subject, the waiver or alternation will not affect adversely the rights and welfare of subjects and the research could not be practicably carried out without the waiver or alteration, the specific future consents could be exempted. Long term follow up of research patients is needed to provide the newly developed information which would be helpful for the patients. Data sharing is needed to prevent the exclusive possession of genetic information. Benefit sharing is the newly coming up debates on how to manage the conflicts of interests between tissue-donors and scientific researchers. The context and inventory of human rights for the research is changing and still under construction.

수중 환경 소음 모델이 적용된 의사 스펙트럼 시간영역 법 합성환경 수중음향채널 모델링 및 시뮬레이션

김장은,김동길,한동석,Kim, Jang-Eun,Kim, Dong-Gil,Han, Dong-Seog 한국시뮬레이션학회 2016 한국시뮬레이션학회 논문지 Vol.25 No.3

수중환경에서 운영되는 무기체계 획득을 위한 설계/개발을 진행하기 위해 수중음향채널 모델링 및 시뮬레이션을 통한 분석은 필수적이다. 일반적으로 수중음향채널 분석을 위해 사용되는 수중음향 전파 수치해석 모델은 음선이론 법, 정규방식 법, 포물선방정식 법, 파수적분 법이 있으나 다중 주파수 분석일 경우 유효성과 신호처리 및 분석에 제한적이다. 본 논문은 단일 및 다중 주파수 분석 및 신호처리 및 분석이 용이한 기존 의사 스펙트럼 시간영역 법 수중음향 수치해석 모델에 수중환경 소음 모델을 적용하여 실제 수중환경과 유사한 합성환경 수중음향채널을 모델링 하였다. 이렇게 구현된 합성환경 수중음향채널 모델의 유효성을 확인하기 위해 단일 주파수 신호 시나리오 4가지 다중 주파수 신호 시나리오 4가지 및 잠수함 기동에 따른 방사소음 분석 시나리오 시뮬레이션을 통해 의사 스펙트럼 시간영역 법 합성환경 수중음향채널 모델 유효성을 확인하였다. It is necessary to analyze underwater acoustics channel(UAC) modeling and simulation for underwater weapon system development and acquisition. In order to analyze UAC, there are underwater acoustics propagation numerical analysis models(Ray theory, Parabolic equation, Normal-mode, Wavenumber integration). However, If these models are used for multiple frequency signal analysis, they are inaccurate to calculate result of analysis effectiveness and restricted for signal processing and analysis. In this paper, to overcome this problem, we propose simple/multiple frequency signal analysis model of the Pseudospectral Time-Domain Method synthetic environment UAC applied to underwater environment noise model as like as realistic underwater environment. In order to confirm the validation of the model, we performed the 9 scenarios simulation(4 scenarios of single frequency signal, 4 scenarios of multiple frequency signal, 1 scenario of single/multiple frequency signal like submarine radiated noise) for validation and confirmed the validation of this model through the simulation model.