반사형 홀로그램 간섭필터의 설계 및 제작

경천수,성기영,이영락,김대건,곽종훈,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-

We designed and fabricated a reflection-type holographic interference filter in a dichromated gelatin film. The relationship between center wavelength and recording angles was derived by wsing coupled wave theory in detail. The variations of center wavelength of the filter were predicted theoretically measured in terms of recording angles.

Porphyrin polyimide의 광전자적 성질

김휘성,성기영,경천수,곽종훈,최옥식,이진국 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-

We have done researches about porphyrin and polyimide containing metalloporphyrins. The polymer showed interesting optical properties. Polyimide containing meso-tetra(oaminopheny1))porphyrinzinc(Ⅱ) was synthesized in this experiment. Optoeletronic properties were characterized with ultraviolet spectrophotometer and emission spectrophotometer. Changing the contents of porphyrin on polyimide chain produced absorption and emission variations. Energy transfer happened in the polymer chain whan compared with just porphyrin-doped polyimide.

홀로그램 회절격자의 이동에 의한 포토폴리며의 위상 변위측정

성기영,경천수,김휘성,이진국,곽종훈,최옥식 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-

Holographic recording and erasure kinetics in a home-made photopolymer film are investigated as a function of monomer concentration and spatial frequency. We also measured phase shifts of index grating and absorption grating by moving holographic photopolymer gratings along a direction of grating wave vector.

FastXcorr : FORTRAN Program for Fast Cross-over Error Correction of Marine Geophysical Survey Data

Kyong-O Kim(김경오),Moo-Hee Kang(강무희),Gee-Soo Gong(공기수) 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.2

해양에서 관측되는 해양지구물리 탐사자료에는 위치오차, 기기오차, 관측오차, 해상 상태 등 다양한 원인에 기인하는 오차가 포함되어 있다. 이에 의해 한 기관에서 해양지구물리 탐사 자료를 취득할 때나 여러 기관에서 취득된 해양지구 물리 탐사자료를 취합할 때 많은 교차점오차가 발생하고, 이러한 교차점오차는 부적절한 해석을 야기하는 인위적인 이 상대를 만든다. 교차점오차를 줄이기 위한 다양한 방법들이 제시되었지만, 이들 대부분의 방법들은 교차점을 찾기 위해 각각의 점자료(point data) 혹은 선분자료(segment data)를 모두 비교함으로써, 불필요하게 많은 계산시간을 요구하게 된 다. 따라서 본 연구에서는 중복구역나눔 방법을 도입하여 빠르게 교차점을 찾고, 가중치선형내삽 방법을 이용하여 교차 점오차를 보정하는 포트란(FORTRAN) 프로그램 (FastXcorr)을 개발하였다. Many cross-over errors due to position errors, meter errors, observation errors, sea conditions and so on occur when marine geophysical data collected by own and other agencies are merged, and these errors can create artificial anomalies which cause an improper interpretation. Many methods have been introduced to reduce cross-over errors. However, most methods are designed to compare each point or segment data to find cross-over points, and require a long processing time. Therefore, FORTRAN program (FastXcorr) is presented to fast determine cross-over points using an overlap-sector, and to adjust cross-over errors using a weighted linear interpolation algorithm.

KIGAM 심부 석유해저 지구물리탐사 동향

김경오(Kyong-O Kim),구남형(Nam-Hyung Koo) 대한지질학회 2018 대한지질학회 학술대회 Vol.2018 No.10

우리나라 관할해역의 해상 중력 및 자력이상도

김경오(Kyong-O Kim) 대한지질학회 2016 대한지질학회 학술대회 Vol.2016 No.10

Combination therapy of oral hypoglycemic agents in patients with type 2 diabetes mellitus

( Min Kyong Moon ),( Kyu Yeon Hur ),( Seung-hyun Ko ),( Seok-o Park ),( Byung-wan Lee ),( Jin Hwa Kim ),( Sang Youl Rhee ),( Hyun Jin Kim ),( Kyung Mook Choi ),( Nan-hee Kim ) 대한내과학회 2017 The Korean Journal of Internal Medicine Vol.32 No.6

The Korean Diabetes Association (KDA) recently updated the Clinical Practice Guidelines on antihyperglycemic agent therapy for adult patients with type ₂ diabetes mellitus (T₂DM). In combination therapy of oral hypoglycemic agents (OHAs), general recommendations were not changed from those of the 2015 KDA guidelines. The Committee on Clinical Practice Guidelines of the KDA has extensively reviewed and discussed the results of meta-analyses and systematic reviews of effectiveness and safety of OHAs and many clinical trials on Korean patients with T₂DM for the update of guidelines. All OHAs were effective when added to metformin or metformin and sulfonylurea, although the effects of each agent on body weight and hypoglycemia were different. Therefore, selection of a second agent as a metformin add-on therapy or third agent as a metformin and sulfonylurea add-on therapy should be based on the patient’s clinical characteristics and the efficacy, side effects, mechanism of action, risk of hypoglycemia, effect on body weight, patient preference, and combined comorbidity. In this review, we address the results of meta-analyses and systematic reviews, comparing the effectiveness and safety among OHAs. It will help to choose the appropriate drug for an individual patient with T₂DM.

2.5-Gb/s Hybrid Single-Mode and Multimode Fiber Transmission of 1.5-<tex> $\mu$</tex>m Wavelength VCSEL

Kim, Jin Joo,Kim, Kyong Hon,Lee, Min-Hee,Lee, Hyun Sik,Lee, El-Hang,Kwon, O-Kyun,Roh, Jay,Yoo, Byueng-Su IEEE 2007 Photonics Technology Letters Vol.19 No.5

<P>We report, for the first time, a successful 2.5-Gb/s transmission performance of a 1.5-mum emission monolithic vertical-cavity surface-emitting laser (VCSEL) over hybrid links composed of 25-km-long conventional single-mode fibers (SMFs) and a 2.2-km-long 50-mum core multimode fibers (MMFs). This result suggests that 1.5-mum wavelength VCSELs can be effectively used for multigigabit-per-second transmission over hybrid links interconnecting SMF-based long-distance and (or) subscriber network lines with MMF-based local-area network lines in the future ubiquitous network era</P>

핵심집단 육성을 위한 옥수수 계통의 형태적 특성 연구

김오겸(O Gyeom Kim),홍탁기(Tak Ki Hong),고우리(Woo Ri Ko),우수연(Su Yeon Woo),마슐쥔(Shi Jun Ma),박종원(Jong Won Park),사규진(Kyu Jin Sa),이주경(Ju Kyong Lee) 한국육종학회 2016 한국육종학회지 Vol.48 No.2

In order to develop a core set and new corn variety in Korea, we evaluated the morphological characteristics of 194 maize accessions by examining eight quantitative characteristics. On the evaluation of quantitative traits for 194 maize accessions, they showed the morphological variations in tassel length (35.1±5.0 cm), plant height (226.1±33.7 cm), ear height (86.3±22.6cm), stem diameter (2.3±0.6 cm), leaf width (9.3±1.1 cm), ear length (14.5±2.4 cm), ear row number (14.1±1.9 row), and 100 kernel weight (24.9±4.4 g). The results of principal component analysis (PCA) indicated that the tassel length, plant height, and ear height greatly contributed to positive direction on the first principal component axis. One-hundred kernel weight contributed to negative direction on the second principal component axis. Thus these morphological characteristics, which contributed greatly in the first and second principal components, might be useful for discrimination among 194 maize accessions. In our study, seven accessions, such as IT026357, IT026441, IT027321, IT033271, IT033591, IT033597 and IT124273, particularly were measured high on yield-related traits. Consequently, the 194 maize accessions used in this study could be used as promising materials for maize breeding programs such as development of new hybrid in Korea.

The Evaluation of UV-induced Mutation of the Microalgae, Chlorella vulgaris in Mass Production Systems

Tae-O Choi(최태오),Kyong-Ho Kim(김경호),Gun-Do Kim(김군도),Tae-Jin Choi(최태진),Young Jae Jeon(전용재) 한국생명과학회 2017 생명과학회지 Vol.27 No.10

미세조류 Chlorella vulgaris는 바이오 디젤 생산을 위한 중요한 대체원료 중 하나로 간주되어 왔으나, 이러한 미생물의 산업적 적용은 낮은 바이오 매스와 지질 생산성에 의해 제약을 받아왔다. 따라서 이러한 문제를 극복하기 위해 본 연구는 자외선을 이용한 무작위 돌연변이 유발 기술을 통해 높은 지질 및 바이오 매스 생산성을 가지는 C. vulgaris 균주를 분리하고 그 특성을 규명하였으며, 두 가지 유형의 대량 생산 시스템을 이용하여 바이오 매스 및 지질 함량의 산출량을 비교하였다. 분리된 돌연변이 균주 중, 특히 실험실 조건에서 UBM1-10으로 명명된 돌연변이 균주는 야생형 균주에 비해 약 1.5배 높은 세포 수율 및 지질 함량을 보였다. 이러한 결과를 바탕으로 UBM1-10을 선택하여 TBPR (tubular photobioreactor)과 OPR (open pond type reactor)의 두 가지 유형의 반응기를 사용하여 실외 배양 조건에서 배양하였다. 그 결과 TBPR에서 재배된 돌연변이 균주의 세포 수율은(2.6 g l<SUP>-1</SUP>)OPR에서 배양된 균주의 세포 수율(0.5 g l<SUP>-1</SUP>)과 비교하였을 때 약 5배 이상의 높은 세포 수율을 나타내었으며, 대량 배양 후, UBM1-10 및 모 균주의 조 지방 함량 및 조성 등에 대해 추가로 조사를 실시하였다. 그 결과 C. vulagris UBM1-10균주의 지질함량(0.3% w/w)이 모 균주의 지질함량(0.1%)에 비해 약 3배 이상의 조 지방 함량을 보유함을 확인하였다. 따라서 이 연구는 바이오 디젤 생산 자원으로서 C. vulgaris의 경제적 잠재성이 photoreactor type의 선택 및 전략적 돌연변이 분리 기술을 통해 증가 될 수 있음을 보여 주었다. The microalgae Chlorella vulgaris has been considered an important alternative resource for biodiesel production. However, its industrial-scale production has been constrained by the low productivity of the biomass and lipid. To overcome this problem, we isolated and characterized a potentially economical oleaginous strain of C. vulgaris via the random mutagenesis technique using UV irradiation. Two types of mass production systems were compared for their yield of biomass and lipid content. Among the several putatively oleaginous strains that were isolated, the particular mutant strain designated as UBM1-10 in the laboratory showed an approximately 1.5-fold higher cell yield and lipid content than those from the wild type. Based on these results, UBM1-10 was selected and cultivated under outdoor conditions using two different types of reactors, a tubular-type photobioreactor (TBPR) and an open pond-type reactor (OPR). The results indicated that the mutant strain cultivated in the TBPR showed more than 5 times higher cell concentrations (2.6 g l<SUP>-1</SUP>) as compared to that from the strain cultured in the OPR (0.5 g l-1). After the mass cultivation, the cells of UBM1-10 and the parental strain were further investigated for crude lipid content and composition. The results indicate a 3-fold higher crude lipid content from UBM1-10 (0.3%, w/w) as compared to that from the parent strain (0.1% w/w). Therefore, this study demonstrated that the economic potential of C. vulgaris as a biodiesel production resource can be increased with the use of a photoreactor type as well as the strategic mutant isolation technique.