색 분포 재배열을 이용한 색 분별력 향상 색역 사상

이재민,김경만,이채수,이철희,하영호,Lee, Jae-Min,Kim, Kyeong-Man,Lee, Chae-Soo,Lee, Cheol-Hee,Ha, Yeong-Ho 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.10

많은 칼라 장치에서 동일한 영상을 출력했을때, 재현된 색들은 장치 사이의 색역 차로 인해 많은 차이를 나타내므로 이를 개선하기 위한 많은 색역 사상 방법들이 제안되었다. 본 논문에서는 기존의 장치 의존적 색역 사상의 단점인 압축 사상에서의 불필요한 왜곡을 줄이고 절단 사상에 의한 색 분별력 저하를 최소화시키기 위해 색 분포 재배열을 이용한 색 분별력 향상 색역 사상 방법을 제안한다. 제안한 방법은 입력 영상의 색을 색 분포라는 3차원 배열로 구성한다. 색 분포의 최대치가 출력 장치 색역의 경계치보다 작다면 같은 색으로 사상을 한다. 반대로 크다면 색역 내부에 색역 외부의 색을 재배열하여 사상을 한다. 결과적으로 모니터에 나타난 영상을 색과 비슷하고 채도가 높은 색이 선형적으로 변하는 영역에서 색의 분별력이 높은 영상을 프린터로 재현할 수 있었다. When the same image is displayed in many different devices, the reproduced colors are not same due to the differences in the gamut between devices. Therefore, many gamut mapping method were proposed to solve this problem. In this paper, color discrimination enhancement gamut mapping method using color distribution rearrangement is proposed to reduce the unnecessary distortions by compression mapping and to minimize the decrease of color discrimination by clipping method. The proposed method constructs color distribution, the 3-dimension array of input image's colors. if the maximum of color distribution is within the boundary of printer gamut. the colors are mapped to the same colors. Otherwise, out-of-gamut colors are compressed into the printer gamut with minimum distortion. Consequently, the printer output image was highly consistent with the corresponding monitor image and had an enhanced color discrimination in region where high chroma varied linearly.

선회와류식 - SBR(上)

이재민,Lee, Jae-Min 한국환경기술인연합회 2006 환경기술인 Vol.23 No.7

서울 시내 궁궐 수원의 수질과 유동 특성

이재민,우남칠,김연태,이강진,Lee, Jae-Min,Woo, Nam-C.,Kim, Youn-Tae,Lee, Kang-Jin 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.2

This study was objected to provide suggestions for best management practices to restore the cultural and historical values of the wells in Palaces as well as their water qualities. Water resources in the five Palaces in Seoul Metropolitan, including Gyeongbokgung, Changdeokgung, Changgyeonggung, Jongmyo Shrine, and Deoksugung, were surveyed for their physical flows and chemical compositions from April to July in 2010. Ground waters in most wells were found at depths within 5 m from the ground surface, showing typical water-table aquifer systems. Hydraulic gradients indicate water resources in Gyeongbokgung, Changdeokgung, and Changgyeonggung flowing toward south, and toward east in Deoksugung area. Especially, water-level fluctuation data at S-10 in Deoksugung implied the influence of groundwater discharge facility. In Jongmyo Shrine, water was not detected in wells, indicating the water level was lower than the well depth. Based on the water chemistry and stable isotope analyses, water resources and their qualities appeared to be formed by the water-rock interaction along the groundwater paths. S-10 (Deoksugung) and S-14 (Changgyeonggung) samples were contaminated with nitrate ($NO_3$) in levels of higher than Korean drinking water standard, 10 mg/L as $NO_3$-N, but once in four sampling campaigns. In the situation that water resources in Palaces still maintain natural characteristics, the materials that will be used for the restoration and improvement of the Palace water supplies should be carefully selected not to disturb the natural integrity. In addition, because the wells are located in the center of metropolitan area, a systematic monitoring should be applied to detect and to manage the potential impacts of underground construction and various pollution sources.

육가공 제품의 저장 및 조리방법이 지질산패에 미치는 영향

이재민,조정순 ( Jae Min Lee,Jung Soon Cho ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.1

Ham, sausage and bacon were treated with common household processing techniques including refrigerated storage(0, 14, 28 days) and cooking(pan-frying, microwaving, boiling). Lipid oxidation was evaluated by measuring fatty acid composition, malonaldehyde(MA), TBA values and by measuring fluorescent products. Major fatty acid composition were oleic acid and followed respectively palmitic acid, stearic acid, linoleic acid, linolinic acid. There was no significant difference in fatty acid composition by cooking method but there was a tendency of being increased of unsaturated fatty acid during 28days storage. Ma, TBA and fluorescent products showd a tendency of being increased continually according to storage days rather than cooking method.

아날로그 회로의 난검출 고장을 위한 효과적인 진단 및 테스트 기법

이재민,Lee, Jae-Min 대한임베디드공학회 2009 대한임베디드공학회논문지 Vol.4 No.1

Testing of analog(and mixed-signal) circuits has been a difficult task for test engineers and effective test techniques to solve these problems are required. This paper develops a new technique which increases fault detection and diagnosis rates for analog circuits by using extended MTSS (Modified Time Slot Specification) technique based on MTSS proposed by the author. High performance current sensors with digital outputs are used as core components for these techniques. A fault diagnosis structure with minimal hardware overhead in ATE is also described.

선회와류식-SBR(하)

이재민,Lee, Jae-Min 한국환경기술인연합회 2006 환경기술인 Vol.23 No.8

일개지역 구급활동 중 병원 전 심정지 및 약물중독 환자 분석 - 노인대 비노인의 차이를 중심으로 -

이재민,윤형완,Lee, Jae-Min,Yun, Hyeong-Wan 사단법인 한국응급구조학회 2010 한국응급구조학회지 Vol.14 No.3

Purpose: The purpose of this study is to determine potential differences in pre-hospital cases of cardiac arrest and drug Intoxication between elderly group and non-elderly group on local emergency activity sites of rescue 119 team for those cases, so that it can provide useful reference materials for a system of corresponding emergency medical services. Methods: Patients with cardiac arrest and drug intoxication in the elderly and the non-elderly group were analyzed by analyzing the Ambulance Run Report for 3 years from January 2007 to December 2009. Results: According to analysis on potential differences between elderly and the non-elderly group, it was found that there was no significant difference between elderly cases (evacuated to hospital due to cardiac arrest and drug poisoning) and non-elderly cases in year of onset (p = .247), quarter of onset (p = .813), sex (p = .235), consciousness state (p = .126), place of onset (p = .215) and number of first aid services (applied to emergency cases) respectively, but there were significant differences between elderly cases and non-elderly cases in guardian availability (p = .042), time zone of onset (p = .050), distance from the site of onset (p = .278), type of onset (p = .000), number of first aid services depending on distance of evacuation (p = .008) and effectiveness of emergency care (p = .003) on statistical basis. Conclusion: It is important to establish a system of early emergency case reports for rational emergency case management with lower mortality; shorten distance from the site of onset at each time zone of onset in emergency cases; employ more emergency team members; facilitate firsthand / secondhand medical instructions for emergency teams in specialized emergency care depending on distance of evacuation for each kind of onset (elderly group vs. non-elderly group); and improve rate of resuscitated emergency cases by extending the scope of works for emergency medical technicians into wider applications, so that it will be possible to take timely and appropriate measures for emergency settings of ever-increasing aged population in near future.

국내 기관 레포지터리 구축 및 활성화 방안 - KAIST의 KOASAS 사례를 중심으로 -

이재민,손청기,이미영,Lee, Jae-Min,Son, Chung-Ki,Lee, Mi-Young 한국과학기술정보연구원 과학기술정보센터 2008 Journal of Information Science Theory and Practice Vol.39 No.3

전통적으로 연구자들은 학술지를 통하여 연구결과를 공식적으로 발표하고 인정받아 왔으며, 그 이후 학회, 출판사, 대학 등의 단체가 학술지의 출판에 주력함으로서 학술지는 양적 질적 성장을 거듭해왔다. 최근 학술정보 유통에서 출판사들의 지나친 가격급등 및 상업화 전략으로 인해 학술정보에 대한 접근과 이용이 제한되고 있으며, 이에 따라 공공재인 학술정보를 무료로 이용할 수 있어야 한다는 주장을 전제로 오픈 액세스(OA)운동이 등장하게 되었다. 이에 본 논문은 오픈 액세스의 가장 핵심적인 실천전략이라 할 수 있으며 대표적인 기관 레포지터리라고 할 수 있는 DSpace 시스템을 소속 기관의 환경에 맞게 재개발한 KOASAS의 구축 및 운영사례를 분석함으로써, 국내대학 및 기관의 레포지터리 구축에 대한 필요성과 활용방안을 제시하고자 한다. Researchers' performances have been evaluated by contributing to the academic journals officially, and academic journals expanded both quantitatively and qualitatively since academic societies, publishers, and universities has concentrated on publishing journals. Recently, access and usage of academic information was restricted due to commercialization strategies and sudden rising of prices, and against this situation, OA movement came out arguing that academic information should be open to everyone freely. This article studies the case of KOASAS which is based on DSpace, one of the typical institutional repositories, and intends to show up the necessity to construct repositories in institutions universities and suggest the method to make full use of repositories.

국내 대수층 유형 분류를 통한 지하수위와 수질의 특성화

이재민,고경석,우남칠,Lee, Jae Min,Ko, Kyung-Seok,Woo, Nam C. 대한자원환경지질학회 2020 자원환경지질 Vol.53 No.5

국가지하수관측망은 지하수 장해 예방과 지하수자원의 효율적 관리를 위해 유역별로 암반 대수층 또는 충적과 암반 대수층 모두에 설치·운영되고 있다. 본 연구에서는 수리지질학적 유형인 자유면과 피압 대수층으로 재분류하여 국내 지하수의 수위와 수질 특성을 재평가하고, 모니터링 자료의 활용방안을 모색하고자 하였다. 충적-암반 쌍으로 구성된 관측소에서 산출된 지하수위 관측자료의 주성분 분석(PCA) 결과, 충적-암반 대수층의 수위변동 주성분은 유사한 변동 패턴을 보였다. 강수량에 따른 수위 상승율과 질산성질소 농도에서도 유의미한 차이가 없었다. 반면, 수리지질학적 유형으로 분류한 경우, 자유면 대수층과 피압 대수층의 지하수위 변동 주성분이 서로 다른 특성을 보였다. 강수에 대한 지하수위 반응에서도 차이가 나타났는데, 수위 상승률은 자유면 대수층과 피압 대수층에서 각각 4.6 (R²=0.8)과 2.1 (R²=0.4)로 산정되어 피압 대수층에서는 강수 함양의 영향을 덜 받는 것으로 판단된다. 피압 대수층으로 분류된 관정들에서는 질산성질소 평균 농도가 3 mg/L 이하로, 인위적 오염의 영향을 거의 받지 않은 자연배경농도로 판단된다. 결과적으로, 국가지하수관측망의 대수층을 수리지질학적 유형으로 재분류했을 때, 수위변동 패턴과 질산성 질소 농도 분포에서 유형별 차이가 구분되어 대수층 유형 분류의 타당성을 검증할 수 있었다. 이러한 대수층의 수리지질학적 상태는 함양량 평가에 따른 지하수자원의 양적 관리와 잠재오염원으로부터의 수질 관리에 필요한 핵심정보를 제공함으로 지하수자원 관리에 기여할 수 있다. The National Groundwater Monitoring Network (NGMN) in South Korea has been implemented in alluvial/ bedrock aquifers for efficient management of groundwater resources. In this study, aquifer types were reclassified with unconfined and confined aquifers based on water-level fluctuation and water quality characteristics. Principal component analysis (PCA) of water-level data from paired monitoring wells of alluvial/bedrock aquifers results in the principal components of both aquifers showing similar water-level fluctuation pattern. There was no significant difference in the rate of water-level rises responding to precipitations and in the NO₃-N concentrations between the alluvial and bedrock aquifers. In contrast, in the results classified with the hydrogeological type, the principal components of water level were different between unconfined and confined conditions. The water-level rises to precipitation events were estimated to be 4.6 (R²=0.8) in the unconfined and 2.1 (R²=0.4) in the confined aquifers, respectively, indicating less impact of precipitation recharge to the confined aquifer. The confined aquifers have the average NO₃-N concentration below 3 mg/L, implying the natural background level protected from the sources at surface. In summary, reclassification of aquifers into hydrogeological types clearly shows the differences between unconfined and confined aquifers in the water-level fluctuation pattern and NO₃-N concentrations. The hydrogeologic condition of aquifer could improve groundwater resource management by providing critical information on groundwater quantity through recharge estimation and quality for protection from potential contamination sources.

확공형 마이크로 파일의 지지력 해석

이재민,김두환,Lee,Jae-Min,Kim,Doo-Hwan 한국방재학회 2014 한국방재학회논문집 Vol.14 No.4

기존 마이크로 파일의 경우 전조나사 강봉과 그라우트와의 부착력 및 그라우트와 지반과의 주면마찰력에 의해 내하성능이 결정된다. 그러나 강봉과 그라우트 간의 부착성능이 가지는 취성파괴 특성과 낮은 내하성능에 의해 천공 깊이가 깊어지는 문제점을 갖고 있다. 따라서 본 연구에서는 기존 마이크로 파일의 지지성능을 개선하고 경제성을 향상시키기 위하여 perfobond rib를 구비한 강봉과 그라우트와 지반간의 주면마찰력을 증가시키기 위해 부분확공부를 설치하는 마이크로 파일을 제안하고, 거동 및 파괴특성에 대한 평가를 수행하였다. 현장 인발시험 결과 부분 확공하여 시공된 지반부 전단키에 의한 내하성능은 상당히 증가된 것으로 평가되었다. The load-carrying capacity of a conventional micropile is determined by the adhesion between the rolled screw thread and the grout, and the skin friction force between the grout and the ground. One of the disadvantage of the conventional micropiles is that the boring depth can be deeper because of low load-carrying capacity and the brittle failure behavior between rolled screw thread and grout. Therefore, it is necessary to develop an advanced feature of a micropile system which efficiently increases load-carrying capacity with a reasonable cost. This study proposes an advanced type of a micropile system. The proposed micropile system consists of perfobond ribs installed steel rod to improve shear capacity between the thread and the grout, and partially expanded drill holes to increase resistance capacity between the grout and the ground. Through on-site pullout tests, it was found that load-carrying capacity increased significantly in the proposed micropile system, due to the shear keys created by the partially expanded drill hole. The proposed micropile system was also evaluated to be much more economical in a case study.