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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.
회전체 베어링계의 주파수응답함수 간접추정과 베어링매개 변수 규명에의 응용
홍성욱 金烏工科大學校 1991 論文集 Vol.12 No.-
회전체 베어링계에서 기능적인 보호나 안전성 확보를 위해 밀폐되어 있어 실측이 어려운 주파수 응답을 측정이 가능한 주파수 응답을 이용하여 간접적으로 추정하는 방법을 제시하였다. 본방법은 기존의 실험적 모델링 방법과는 달리 보조 유한요소 모델(finite element auxiliary model)을 도입, 이를 측정이 가능한 주파수응답과의 관련성을 이용하여 측정하지 않은 주파수응답을 추정할 수 있는 단순한 선형식을 도출함으로서 활용이 손쉬울 뿐만 아니라 실험을 대폭 간편화할 수 있다는 장점을 갖는다. 개발된 간접추정식은 실측이 어려운 베어링에서의 주파수 응답을 구하여 베어링 매개변수 규명방법에 적용하였고, 수치 실험을 통하여 제시된 방법의 우수성을 증명하였다.
부분 구조법에 의한 주파수 응답 해석에서의 개선된 동적 커플링 기법
홍성욱,진용욱 金烏工科大學校 1995 論文集 Vol.16 No.-
The present paper proposes an efficient method for computation of the frequency response matrices of linear structural dynamic systems modeled with substructuring technique. An effective coupling scheme for frequency response is proposed to obtain the frequency response matrix of the whole system by making use of frequency responses of substructures without resulting in any errors. The proposed method necessitates neither an erroneous reduction of coordinates nor a coordinates transformation which is likely to make the system matrix sparse. The proposed method is formulated in detail and illustrated through numerical examples. The numerical study shows that the proposed method is very efficient compared with the conventional method.
홍성욱 金烏工科大學校 1993 論文集 Vol.14 No.-
Although the modal testing is thought of as one of the fundamental methods in the vibration analysis of structural dynamic systems, the modal testing cannot be completely accomplished because some frequency responses are not measurable. The present paper proposes an efficient estimation method for unmeasured frequency reponses of general structural dynamic systems with local uncertain parameters. The essential feature of the proposed method is characterized by the linear formulae to estimate frequency responses by utilizing an incomplete set of measured frequency responses and a finite element auxiliary model equation which is constructed to be identical to the prototype except local unknown parameters. The estimation procedure is completely illustrated through an analytical example. A numerical experiment is also provided to verify the applicability of the proposed method.
부분적으로 일정한 자기장의 영향을 받는 보의 동적해석에 관한 연구
홍성욱,박중윤 金烏工科大學校 1992 論文集 Vol.13 No.-
This paper presents the dynamic analysis of a beam subjected to a piecewise uniform magnetic field. The objective of this study is to test the applicability of a passive magnetic damper in the suppression of structural vibration. The fundamental idea of the passive magnetic damper is that a moving conductor experiences viscous damping force when subjected to a magnetic field, due to internal current loss induced by electromotive force. The dynamic equation of the system is formulated by using the Green function method and finite element modeling technique. Simulation of the system is also performed to discuss the pros and cons of the passive magnetic damper in the suppression of a beam vibration.
홍성욱,박중윤,김현수,박재현,박창용 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-
The present paper investigates the chatter stability of a milling spindle-workpiece system in face milling process. To this end, a new method using frequendy response function is adopted for predicting the chatter vibration. A compliant workpiece is used to make the spindle-workpiece system easily exposed to chatter vibration. The entire experimental procedure, including measurement of frequency response function and cutting coefficients, is demonstrated. The experimental result shows that the chatter stability prediction method using frequendy response function is of great use in face milling process.
홍성욱,김흥수 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.2
The goal of this paper is to predict the range of the reflection coefficient on the area which is divided by the satellite photograph in Cheju. We select the sample points on the smooth surface and measure the field strength. The range of the reflection coefficients on the sample area are obtained by the regression analysis as function of the coefficient for incidence angle and the measured field strength. The field strength in the divided area are obtained using this coefficient. The difference between the measured results and theoretical predictions is only within 5dB.
홍성욱,강부식,김흥수 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1
In this paper, the scattered electric fields is computed to predict the shielding zone by analysing the effect of the reflected azimuth anlge at the building, and considering the path differences at observation point between the rays from origin and any point in the building. The scattering coefficients. which are applicable to the prediction of shielding zone. are computed and compared with measured one. We found that the scattering power become weak over 10 degree of the azimuth angle at which the scattering coefficient is lower than 40 dB. From this, the shielding zone can be estimated.
제주도 위성사진에 의한 지형 분포에 따른 반사계수 비교
홍성욱,김흥수 濟州大學校 工科大學 産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.2
The goal of this paper is to predict the range of the reflection coefficient on the area which is divided by the satellite photograph in Cheju. We select the sample points on the smooth surface and measure the field strength. The range of the reflection coefficients on the sample area are obtained by the regression analysis as function of the coefficient for incidence angle and the measured field strength. The field strength in the divided area are obtained using this coefficient. The difference between the measured results and theoretical predictions is only within 5dB.