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서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(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 menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. 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 64.5% in 1998.
중성자 조사에 의해 생성된 실리콘 결정내의 점결함 연구
이운섭,류근걸,김봉구 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
반도체 소자의 기판 재료로 사용되고 있는 실리콘 웨이퍼는 그 정밀도가 매우 중요하다.본 연구에서는 균일한 Dopant 농도 분포를 얻을 수 있는 중성자 변환 Doping을 이용하여 실리콘에 인(P)을 Doping하는 연구를 수행하였다.중성자 변환 Doping, 즉 NTD(Neutron Transmutation Doping)란 원자번호 30인 실리콘 동위원소에 중성자가 조사되면 원자번호 31인 실리콘으로 변환되고, 2.6시간의 반감기를 갖고 decay 되면서 인(P)으로 변하게 되어 실리콘 웨이퍼에 n-type 전도를 갖게 하는 것을 말한다.본 연구에서는 하나로 원자로를 이용하여 고저항(1000-2000Ω㎝) FZ 실리콘 웨이퍼에 중성자 조사하여 저항의 변화를 관찰하였고, 중성자 조사시 발생하는 점결함을 분석하여 점결함이 저항 변화에 미치는 영향을 알아보았다.중성자 조사 전 이론적 계산에 의해 16.8Ω㎝와 4.76Ω㎝의 저항을 얻을 수 있을 것으로 예상되었고, 중성자 조사 후 SRP로 측정한 결과 실리콘 웨이퍼가 3Ω㎝와 2.5Ω㎝의 저항을 가지고 있을 확인할 수 있었으며, FT-IR 분석결과 점결함의 변화 양상을 확인할 수 있었다.
전동휠체어용 Variable Reluctance Motor의 개발에 관한 연구
李奉燮,李英美 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.2
In this paper, the variable reluctance motor(VRM) has a simple rotor construction with no winding. It also has simple concentrated windings on the stator. Thus, it is expected to be a lower cost machine to manufacture than the squirrel cage induction motor. The main object of this paper is to predict the locked rotor torque waveforms for the VRM. The locked rotor torque for VRM has been calculated using two-dimensional FEM(Flux2d) and the results are shown in the paper.
이봉섭,주재현 三陟大學校 産業科學技術硏究院 2005 産業科學技術硏究論文集 Vol.10 No.-
In this study, the relation of discharge patterns with the radiated electromagnetic waves is investigated by measuring electromagnetic waves using a antenna and a spectrum analyzer. The patterns of radiated electromagnetic waves measured at the atmospheric pressure in Liquid Nitrogen(LN_(2)) during the partial discharges in nonuniform electric field depend on positive DC power. From these points of view, it is considered that these results obtained from this investigation may be used as fundamental data for diagnosis and prediction of insulation on the equipments of superconducting and cryogenic applications.
이봉섭,진광윤,오홍석,김영흥 三陟大學校 2002 論文集 Vol.35 No.-
In this paper, the new transverse flux machine type claw pole linear stepping motor(TFM_CPLSM) is proposed. And the magnetic equivalent circuit of TFM_ CPLSM is derived by the structure of the TFM_CPLSM. The design parameter, the magnetic flux density and the static thrust force of TFM_CPLSM are Performed with three-dimensional finite element method.
李奉燮,陳廣允,吳鴻錫 三陟大學校 2001 論文集 Vol.34 No.1
The variable reluctance motor(VRM) has a simple rotor construction with no winding. It also has simple concentrated windings on the stator. Thus, it is expected to be a lower cost machine to manufacture than the squirrel cage induction motor. However, to realize the more stable and higher backward and forward control, it is necessary to decrease the inertia of rotor. In this paper, the calculation of design parameter and magnetic flux density is performed to predict the locked rotor torque waveforms with rotor positions for the rotor shapes of the VRM. The locked rotor torque for VRM has been calculated using three-dimensional FEM(Flux3d).
이봉섭,박승조 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1
Waste activated carbon containing phenol discharged from industrial field used the samples of this study. We investigated with the physical and chemical characteristics of activated carbon regenerated by Pseudomonas putida (KCCM 11762). The results obtained from investigated the physical and chemical characteristics of regenerated activated carbon in case of pH 7. regeneration time 20 hrs and regeneration temperature 26℃, the removal efficiency of phenol was 93%, average iodine adsorbability was l082mg/g and methyleneblue decolorization power(MBDP) was 138㎖/g.
이봉섭,주재현 三陟大學校 産業科學技術硏究院 2005 産業科學技術硏究論文集 Vol.10 No.-
If obstacle in power supply, its affects are great are on the community and it is consequently demanded lots of difficulties to recover and repair. Accordingly, diagnosis techniques, that are able to prevent from accidents before they happen by providing more stable and highly reliable power effectively and finding sign of the accidents, is very, important. A novel Ultra Wide Band microstrip-fed circular patch antenna i presented. The measured impedance bandwidth of the proposed antenna is from 0.5[GHz] to 2.5[GHz] with the stop band from 0.5[GHz] to 1.7[GHz] for VSWR<2. Form results of this study, The antenna is will play an important role for the sensor for insulation diagnosis system by UHF method of real site GIS and power equipment using SF_(6) gas.
조찬섭,이봉희,이종현,최규만 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
Micromechanical structures such as cantilever beams and bridge array (~μm thick, 100~500 μm long) were fabricated by formation of porous silicon layer. The beam array of n/p samples have irregular etched surface and cusp. On the otherhand, beams of n/n^(+)/n structure have clear etched surface and no cusp.
최성우,이봉섭,곽명화,윤철종,박승조 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.2
Chromium occurs naturally in the earth's crust as well as in air, surface, and ground water. However, chromium is released to the environment in much larger amounts as a result of human activities. Hexavalent chromium, Cr(Ⅵ), is very soluble in water in natural environment and very toxic, carcinogenic, and mutagenic in animal and man. On the other hand trivalent chromium, Cr(Ⅲ), is less toxic and less soluble and thus is a lesser problem. This study has been carried out in order to reduce toxicity of Cr(Ⅵ) by an Escherichia coli strain. After adding E. Coli., the results were obtained from concentration of total Cr, Cr(Ⅵ). Cr(Ⅲ), pH, turbidity, and VSS in aerobic condition was summarized as follows : After 48hr aerobic condition in experiment of synthetic wastewater, the reduction rate of Cr(Ⅵ) was 20%. Also, the reduction rate of Cr(Ⅵ) was 60% in experiment of raw wastewater.