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.

치아표면 처리에 따른 치면열구전색재의 전단강도에 관한 비교실험연구

이재민,신승철 ( Jae Min Lee,Seung Chul Shin ) 대한예방치과·구강보건학회 1994 大韓口腔保健學會誌 Vol.18 No.1

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.

하악과두골절 수술 후 발생한 Frey Syndrome

이재민,기은정,천해명,최문기,Lee, Jae-Min,Ki, Eun-Jung,Cheon, Hae-Myung,Choi, Moon-Gi 대한악안면성형재건외과학회 2013 Maxillofacial Plastic Reconstructive Surgery Vol.35 No.6

Frey syndrome is a disease characterized by abnormal sweating, facial redness, and rare pain by stimulation of taste sense on the limited area dominated by the auriculotemporal nerve and great auricular nerve. Although the developmental mechanism and histopathologic cause of Frey syndrome are still being debated, the most reliable theory is based on injury of the parathympathetic nerve connected to the auriculotemporal nerve continuing to abnormal regeneration. The other theory is that the sweat glands develop an increased sensitivity after degeneration of sympathetic fibers. Therapy of Frey syndrome includes drugs, radiographic treatment, and surgical treatment; however, in most cases, treatment is not satisfactory. This is a case report on a 24-year-old male patient with Frey syndrome caused by the fracture reduction with retromandibular approach after multiple facial traumas and spontaneous healing without any special treatment.

위성 SAR용 광대역 이중편파 적층형 패치 배열 안테나 설계 및 제작

이재민,유제우,채희덕,이유리,정화영,김종필,박종국,Lee, Jae-Min,Yu, Je-Woo,Chae, Heeduck,Lee, YuRi,Jung, Hwa-Young,Kim, JongPil,Park, Jongkuk 한국ITS학회 2021 한국ITS학회논문지 Vol.20 No.2

본 논문에서는 위성 SAR 시스템에 적용하기 위한 광대역 이중편파 적층형 패치 안테나를 설계하고 제작 결과를 제시하였다. 위성 SAR 분야에 주로 적용되는 X-대역에서 위성 SAR 시스템의 영상 품질 향상을 위해 손실 최소화, 광대역 동작 그리고 능동위상배열안테나에 적용이 가능하도록 능동반사손실 최소화 관점에서 안테나를 설계하였다. 제작된 안테나의 대역폭은 능동반사손실 -10 dB 이하 기준에서, 수직/수평 편파 각각 19.26%/19.79% 이며, 손실은 주파수 평균으로 수직/수평 편파 각각 0.797 dB/0.799 dB 로 확인되었다. 또한, 근접전계시험으로 안테나의 빔 패턴을 확인하다. 그 결과, 배열이론을 바탕으로 계산된 이상적 패턴과 비교하여, 측정된 패턴 및 지향성이 매우 유사함을 확인하였다. This paper proposes a wide-band dual-polarization stacked patch array antenna for satellite SAR system applications. The array antenna was designed for loss minimization and wide-band characteristics to enhance the performance of the SAR system and optimize it for active return loss in applications to active phased arrays. The fabricated array antenna showed a performance of 19.26%/19.79% fractional bandwidth within the -10 dB reference level of the active return loss and showed loss characteristics of 0.797 dB/0.799 dB averaged within the operational frequency for both H/V-polarization cases. The pattern performance was verified by comparing the measured patterns with the calculated patterns obtained by the array factor.

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.

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.

FOLFIRINOX 병합요법을 통한 이차 항암화학요법으로 완전 관해를 획득한 진행성 췌장암 증례

이재민,정광현,박진명,이상협,류지곤,김용태,Jae Min Lee,Kwang Hyun Chung,Jin Myung Park,Sang Hyub Lee,Ji Kon Ryu,Yong-Tae Kim 대한소화기암연구학회 2014 Journal of digestive cancer reports Vol.2 No.1

Pancreatic cancer is a highly aggressive cancer with poor prognosis. Although, gemcitabine is the current standard regimen as first-line chemotherapy for advanced pancreatic cancer, effective regimens of second-line chemotherapy after gemcitabine failure have not been established yet. We report a case of gemcitabine refractory pancreatic cancer treated with second-line chemotherapy with FOLFIRINOX regimen. A 57-year-old-woman visited our hospital for pancreatic body mass detected by computed tomography (CT). The patient underwent distal pancreatectomy and splenectomy and the pathologic results after surgery demonstrated adenocarcinoma. Follow-up was performed after surgery and CT and positron emission tomography (PET) 4 months after surgery revealed multiple hepatic metastases. The patient underwent first-line chemotherapy with gemcitabine and erlotinib for recurred pancreatic cancer. However, CT after 7 cycles of the chemotherapy showed the progression of multiple hepatic metastases and switch to second-line chemotherapy with FOLFIRINOX was initiated. CT after 16 cycles of the FOLFIRINOX showed the complete remission of multiple hepatic metastases. The patient was admitted for infective endocarditis with septic pneumonia 17 months after the initiation of FOLFIRINOX. However, the patients died from the progression of septic embolism and acute respiratory distress syndrome.

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.