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서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1997)
김재홍,문득곤,김정수,김용준,임동진,박상훈,김희성,이민수,송기훈,김갑형,김형석,성소영,이인섭,김석우,황지환,조창근,김경문,부태성 대한화학요법학회 2000 대한화학요법학회지 Vol.18 No.3
Background : In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. Objective & Methods : For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1997. 99 strains of N. gonorrhoeae were isolated, among which 45(45.5%) were PPNG. Conclusion : The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 45.5% in 1997.
김현곤,이동희 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-
본 논문에서는 전력 용량 10kW급의 새로운 양방향 PWM Sepic/Zeta 회로를 사용한 컨버터를 제안한다. 이 회로를 설계하고, 이 컨버터의 설계가 동작 가능한지에 Matlab의 Simulink를 사용하여 시뮬레이션 하였다.
서울시 토양 중 다환방향족탄화수소의 농도특성에 관한 연구
김동환,옥곤 한국환경과학회 2005 한국환경과학회지 Vol.14 No.1
Soil is one of the most fundamental elements as well as with water and air in studies associated with the environment, in addition. it is one of the important environmental mediums that constructs a basis of the biological system and performs various roles of matter circulation. This study was carried out in Seoul, in May 2000 to evaluate variation in the concentration levels and distribution characteristics for PAH compounds in soil. Soil samples were collected from 33 sites covering traffic, factory, incineration and mountain groups and the PAHs were analyzed. The results show a wide distribution range of PAHs concentrations between 14.66 ng/g and 1,219.35 ng/g. The highest concentration levels exist at Sungsu-2 of the factory group (FS-2). Daemo-3 of the Mountain group (MD-3) presents the lowest levels as compared with the other sites. PAH compounds including mutagenic and carcinogenic materials show high concentrations in the traffic and factory groups and a high ratio in the mountain group. Besides, these compounds absorbed with micro particles might be spread out over a wide region associated with particles' movement and diffusion. After principal component analysis of the soil samples, the results indicated that the sources of PAHs in the soil were divided into two groups, pesticides and vehicles.
김언곤,신동일,조성준 한국항공대학교 1986 論文集 Vol.24 No.-
Uplink와 downlink 가우스성 잡음이 존재하는 존재하에서 비선형 위성 트랜스폰더(transponder)를 통과하는 DS-BPSK(Direct Sequence-Binary Phase Shift Keying)신호의 오율식을 구했다. 위성 트랜스폰더의 TWT(traveling wave tube)전력 증폭기의 비선형 특성은 이상적인 하드리미터(hard limiter)로 모델링하였다. 구해진 오율식에 의해 컴퓨터 계산을 행하고, 그 결과를 반송파 대 uplink잡음전력비(uplink CNR), 반송파 대 downlink잡음 전력비(downlink CNR) 및 확산 스펙트럼의 처리 이득을 파라미터로 하여 그래프로 나타내고 선형시스템의 경우와 비교ㆍ분석했다. 그 결과 uplink CNR 이 O[dB] 이상일 경우는 비선형시스템이 선형시스템에 비해 downlink CNR 면에서 0.4[dB] 정도의 이득이 있었고, 선형시스템에 대한 비선형시스템의 개선도에 있어서 처리 이득은 그다지 영향을 미치지 못함을 알 수 있었다. The error rate equation of DS-BPSK(Direct Sequence-Binary Phase Shift Keying) signal transmitted through the nonlinear satellite transponder has been derived in the up link and downlink Gaussian noise environment. The nonlinearity of TWT(traveling wave tube) in satellite transponder is modeled as an ideal hard limiter. The numerical results of the derived equations have been shown in figures in terms of carrier to uplink noise power ratio(uplink CNR), carrier to downlink noise power ratio(downlink CNR) and process gain, and compared with those of the linear system. In the analysis, we have known that when the uplink CNR is below -5[dB] the hard-limited system degrades the error rate performance compared with the linear system, however, when the uplink CNR is above O[dB] the hard-limited system can gain 0.4[dB] improvement in downlink CNR to maintain a fixed error rate Pe=10(??) compared with the linear system. Even though the process gain can improve the error rate performance of both systems-the hard-limited system and the linear system, it does not affect seriously the improvements of the hard-limite system performance over the linear system performance.
약물전달체를 위한 폴리에틸렌글리콜과 폴리카프로락톤을 이용한 나노입자
김태형,채수영,최창용,김동곤,김명열,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2
The self-aggregation behavior and microscopic characteristics of the PEG-b-PCL copolymer self-aggregates, prepared by solvent evaporation method, were investigated by `H NMR, dynamic light scattering (DLS), and fluorescence spectroscopy. The PEG-PCL block copolymer formed nano-sized self-aggregates in an aqueous environment by intraand/or intermolecular association between hydrophobic PCL chains. Then, drug loading and its release behavior of clonazepam loaded PEG-b-PCL nanoparticles were investigated. The result revealed that hydrophobic-hydrophilic balances played a crucial role for drug loading and its release behaviors.
김동백,강대호,구인선,김봉곤 경상대학교 과학교육연구소 1996 科學敎育硏究所報 Vol.16 No.1
This study treats of the comparative analysis of the science textbooks in relation to the inquiry learning ability and STS viewpoint in order to offer some aids that help teaching/learning in class. The major findings of the study are summarized below. 1. The textbooks on the 6th curriculum contain more variety of inquiry process than those on the 5th, which makes students get interested in their learning and get the result of experiments without making experiments. 2. The pictures on the 6th rose 27 percent compared with 5th. It can help students reduce the burden of learning and understand science more easily. 3. The textbooks on the 6th are intended to develop a balanced and varied inquiry ability, while the textbooks on the 5th are rather biased to several items. 4. The textbooks on the 6th have more contents and pictures connected with everyday science than those on the 5th.
김송영,유동선,김일곤 昌原大學校 基礎科學硏究所 1995 基礎科學硏究所論文集 Vol.7 No.-
The precipitation condition of quantum dots has been investigated for CuBr doped aluminob-orosilicate glass by changing the composition of glasses. The prepared glasses was annealed at various temperatures. The precipitation of CuBr quantum dots were affected by Na₂O mol% ratio in glass composition. The proper Na₂O mol% was 5-13 mol%. That is, the alkali f-raction for precipitation of quantum dots was 0.1- 0.2. The absorption spectrum of prepared CuBr quantum dots was examined at 77K and 13K.