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Fly Ash를 사용한 수중 불분리 콘크리트의 배합 방법에 따른 콘크리트의 성질에 관한 연구
김우중,권중현 진주산업대학교 1997 論文集 Vol.36 No.-
This study investigates the effect of mixing method on the antiwashout underwater concrete containing Fly Ash. On the experimental condition, the unit weight of used materials was fixed and a new the mixing method different from the traditional method in its prolonged mixing time and the order of material inputs was used. In this experiment, the mixing time was prolonged to 10 minutes, and the order of material input was changed to make the admixture homogeneous. That method of mixing improved the fluidty, the unit weight and compressive strength of fresh concrete.
김우중,권중현,이관희 진주산업대학교 1997 論文集 Vol.36 No.-
The stress analysis concerned with axisymmetrically loaded axisymmetrical structures, such as pressure vessels, rockets, cooling towers, roof domes and storage tanks, has been researched with a lot of difficulties. The elements of revolution using the finite element method enable these problems to be analyzed with a high degree of confidence. This research focuses on the efficient conduct of the thin axisymmetric shells subject to axisymmetrical load which was idealized by a series of conical frustum-shaped elements that was suggested by Grafton and Strome and later extended by Percy. In this study, this research mentioned above is extended to the conical shell whose end is fixed to simplify the methodology of the analysis of any kinds of axisymmetrically loaded axisymmetrical shell structures. To demonstrate the validity and simplicity, the results of the proposed method were compared with the numerical solution SAP90 and got agreeable results.
칼라 영상의 경계추적에 의한 윤곽선 인식이 적용된 귤 선별시스템
최연호,권우현 한국센서학회 2002 센서학회지 Vol.11 No.2
농산물의 품질은 여러 가지 인자에 의해 결정되는데, 이 인자들은 파괴 또는 비파괴 측정방법을 이용하여 측정되고 검사된다. NIR분광분석법은 당도, 산도와 같은 내부품질을 측정하는데 이용되고 있다. 과일의 색. 크기와 같은 외부 품질 측정에는 CCD 카메라가 사용되고 있다. 오늘날 이러한 비파괴 검사법이 널리 연구되고 있다. 컵 위에 자동으로 탑재되어 카메라와 NIR장비로 실시간으로 측정된 과일의 품질과 등급은 내부, 외부인자에 의해 결정된다. 본 논문은 과일 선별기를 제작함에 있어서 과일의 칼라영상의 경계를 검출하는 수정된 윤곽선 추적법과 일반적인 방법보다 빠른 속도로 연결점 데이타를 구성하는 방법을 제안한다. 연결점 데이타는 과일 영상의 크기 계산과 하나의 컵에 중복 탑재 과일과 컵 사이에 불량 탑재된 과일을 검사하는데 사용된다. 설계된 과일 선별기는 귤의 경우 과일의 당도 산도 및 크기를 검사하면서 초당 8개의 과일을 선별할 수 있다. The quality of agricultural products is classified with various factors which are measured and determined by destructive and/or nondestructive method. NIR spectrum analysis method is used to determine internal qualities such as a brix and an acidity. CCD color camera is used to measure external quality like color and a size of fruit. Today, nondestructive methods are widely researched. The quality and the grade of fruit loaded into a cup automatically and measured in real time by camera and NIR system is determined by internal and external factors. This paper proposes modified boundary tracking algorithm which detects the contour of fruit's color image and make chain code faster than conventional method. The chain code helps compute a size of fruit image and find multiple loading of a fruit in single cup or fruit between two cups. The designed classification system sorts a citrus at speed of 8 fruit/s, with evaluating a brix, an acidity and a size grade.
조내수(Cho Nae-su),김우현(Kim Woo-Hyen),최연호(Choi Youn-Ho),박철우(Park Chul-Woo),권우현(Kwon Woo-Hyen) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 유도전동기 벡터제어를 위한 전류 및 속도제어기의 간단한 설계 방법을 제안한다. 일반적으로 유도전동기 전류 및 속도제어에 PI형태의 제어기를 사용할 경우 제어기이득 결정과정에는 많은 시행착오가 따른다, 본 논문에서는 전동기 상수 및 원하는 대역폭으로부터 제어기이득을 직접 구하여 설계과정을 단순화함으로써 시행착오를 줄이거나 제거할 수 있게 하였다. 제안한 방법의 유용성 및 성능을 모의실험을 통해서 확인한다.
김우현,이무영,권우현,윤경섭,마진석 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.2
In this paper, a new PWM rectifier which offers a unity power factor is proposed. This circuit has the same inductance as the conventional PWM rectifier in powering mode, but it has less inductance in freewheeling mode. Because the time period of freewheeling mode is shorter than that of conventional PWM rectifier, a discontinuous input current is easily obtained. Therefore the rectifier accomplish as a unity power factor in wider range of duty ratio and boosting factor. We analyzed each mode of the proposed PWM rectifier, and proposed optimal design methods. We prove the advantages of the proposed PWM rectifier by comparing it with the conventional PWM rectifier through mathmatical analysis and simulation.
김우현,이무영,마진석,권우현,윤경섭,김승민 경북대학교 전자기술연구소 1998 電子技術硏究誌 Vol.19 No.1
In this paper, we developed the simulation model for the induction motor using SIMULINK in MATLAB. The induction motor model is based on the voltage, current and flux linkage equations on the arbitrary reference frame. The constructed model is very user friendly and its parameters may be changed continuously. We also developed the simulation model for the indirect vector controller and the current regulated PWM(CRPWM) voltage source inverter(VSI).
자궁각 임신의 임상적 고찰 및 치료적 골반경 수술의 연구
박현락(Hyen Rak Pak),권순철(Soon Chul Kwon),강인구(In Goo Kang),이상언(Sang Eon Lee),김태우(Tae Woo Kim),강승철(Seung Chul Kang),원석(Seok Won),박정근(Jeong Keun Park) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10
N/A Most of treatments have been performed laparotomy, but the rapid advances in laparoscopic operative and laboratory techniques and instrument allowed to apply laparoscopic surgery to this disease. We have reviewed 342 cases of ectopic pregnancy from march 1994 to march 2001.The cornual pregnancies were 21 case (6.1%), and the laparoscopic management in 11 cases. The mean gestational age at the time of laparoscopic surgery was 9.1 1.2 (n=11) weeks, and laparotomy was 9.4 1.3 (n=10) weeks. There were no significant difference. The mean operation time of laparoscopic surgery was 72.8 25.5minutes, and laparotomy was 68.3 24.3minutes. The mean hospital days of laparoscopic surgery were 4.9 2.4days, and laparotomy were 6.6 2.3days. In conclusion, laparoscopic surgery can be used as effective and safe as laparotomy for cornual pregnancy.