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초음파 분무냉각을 이용한 열사이폰의 작동특성에 관한 실헙적 연구
김영찬,한양호 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In this study, the working characteristics of the two-phase closed thermosyphon with ultrasonic spray cooling system in condenser section was experimentally investigated. The thermosyphon test tube was made of copper tube 300㎜ long, 11.1㎜ inner diameter. The experimental results were compared with the results that air cooling system were used in condenser section. The experimental results show that the total thermal resistance of thermosyphon tube becomes lower when the ultrasonic spray cooling system was used in condenser section. A comparison is made of the two working fluid, water and ethanol. The surface temperature of the water tube in evaporator section becomes higher than the ethanol tube. Thus, the experimental result shows that wate is more useful as working fluid than ethanol to increase the operational limit within this experimental conditions.
위상 및 음압 레벨제어를 이용한 스테레오 음상 확대에 관한 연구
한찬호,박양우,장주석 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)
Three-dimensional sound is a technique for generating or recreating sounds so they are perceived as emanating from locations in a three-dimensional space. Three dimensional sound has the potential of increasing the feeling of realism in music or movie soundtracks. Three-dimensional sound effects depend on psychoacoustic spectral and phase cues being presented in a reproduced signal. In this paper we propose an effective algorithm for the sound image expansion in television system using stereo image enhancement techniques. In this algorithm, a lower frequency band sound is expanded by phase control and a higher frequency band sound is expanded by cross-talk cancelation. Compared to the other techniques of three-dimensional sound, the proposed algorithm use only two speakers to enhance the sound image expansion, while maintaining the original sound characteristics.
균일한 색 변화를 위한 밝기 사상과 최대 채도 재현을 위한 색역사상
박양우,윤태진,한찬호 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)
In this paper, luminance mapping for uniform color distribution and gamut mapping for maximum chroma reproduction are proposed. In the conventional lightness mapping, the average lightness difference between the two gamut is increased and different color changes in bright and dark regions are also increased. TO solve these problems, a lightness mapping is proposed that minimizes the lightness difference of the cusps at each hue angle and produces same color changes in bright and dark regions. Also, chroma mapping that utilize variable anchor point and an anchor point are proposed for maximum chroma reproduction and uniform color change. The proposed algorithm reduce a sudden color change on the gamut boundary of the printer and to maintain a uniform color change during the mapping process. Accordingly, the proposed algorithm can reproduce high quality images with low-cost color devices.
히트파이프·휜으로 구성된 방열 시스템의 초음파 분무냉각에 관한 실험적 연구
김영찬,한양호 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
In this study, the spray cooling heat transfer of the finned heat pipe heat sink was experimentally investigated. The heat pipe was made of copper tube 300mm long, 11.1mm inner diameter and the wick structure consists of two layer of 100 mesh copper screen. The evaporator and condenser lengths of heat pipe were 40, 200 mm and a series of copper fins attached to the condenser. The experimental results show that the heat transfer in the finned heat pipe heat sink is enhanced by using the ultrasonic spray cooling and the total thermal resistance of the heat sink system decreases remarkably.
인간 시각 특성을 고려한 DTV 비디오 테스트 패턴 연구
한찬호,박양우,윤태진 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(C)
For DTV development and testing, we propose composite a video test pattern considering human visual characteristics and compress to stream. In this paper, we use the SMPTE 274M for video input format. And we compose verity analog video test pattern and develop digital video test pattern. We propose MPEG-2 MP@HL compression algorithm for proposed still picture sequence maintaining above 40dB picture quality. Finally we test several DTV using proposed video test pattern.
남호정,양성일,백인찬,권영헌,이건상 漢陽大學校 工學技術硏究所 1996 工學技術論文集 Vol.5 No.1
In this study, QMF is used for recognition of Korean digits from /Young/(zero) to /Geo/(nine). The frequency band is divided into 8 bands and 16 bands. Each digit was pronounced repeatly 15 times by one man speaker so that 150 sample digits were used to be divided into 8 bands and 16 bands. The recognition of Korean digits was proposed and carried out to use the energy in each band. The recognition was done and compared according to the number of candidate patterns to be recognized. Experiments resulted in remarkably good recognition rate when the number of candidate patterns are above a threshold value.
와전류검사에 의해 검출된 증기발생기 전열관의 균열 특성
조찬희,남민우,김영호,양승한,이희종 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-
The flaws detected at the steam generator tube of the Nuclear Power Plant are the wear indications by anti-vibration bars and circumferential cracks at the top of the tubesheet. It is easy to detect and size wear indications. Also the wear indications are commonly found at the steam generator tubes. However, the steam generator tube which includes crack indication is plugged because it is very difficult to predict the growth rate and the sizing error is high. The motorized rotating pancake coil has been used for the detection of circumferential crack since it is not possible to detect using the conventional bobbin probe. This paper describes the characteristics for the circumferential crack at the steam generator tubes of the Korean Standard Nuclear Power Plants.
고추 탄저병 저항성 중간모본 ‘원예 100005호 ’,‘원예 100006호’ 육성
양은영,김수,채영,채수영,조명철,문지혜,박태성,이우문,곽정호 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2
Owing to frequent heavy rain due to abnormal weather, the occurrence of pepper anthracnose has recently increased, which affects the supply and demand of pepper. As a result, the price of red pepper powder in 2011, for example, increased three times compared to the average year. Although anthracnose of pepper plants has been controlled by fungicides until now, it is important to develop new resistant cultivars because of the reduction of the labor force in rural area and occurrence of new anthracnose strains resistant to fungicides. National Institute of Horticultural and Herbal Science developed two pepper lines, ‘Wonye 100005’ and ‘Wonye 100006’ that are resistant to pepper anthracnose. These lines were developed by continuous selection of progenies from a cross between ‘Wonye AR1’, which were developed from interspecific hybridization and ‘TF68’. The anthracnose resistance level of the two lines was higher than that of commercial cultivars and similar to check varieties showing highest level of anthracnose resistance.
보안성향상과 네트워크 부하감소를 위한 Jini 기반 SNMP 시스템 설계 및 구현
윤태진,박양우,한찬호 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
Web-based SNMP and CORBA-based SNMP have been studied as a standard of network management technology in distributed environment. Jini can be used to build robust and reliable networks without modification to any platforms as network plug & play protocol. In this paper, we design and implement Jini-based SNMP system. This system has manager, agent, and lookup service, and communicates each other via Java RMI. The manager supervises networks by user interface component, the agent takes a various task of network management, and the lookup service links manager to agents dynamically. Security and portability are enhanced using JAVA, and communication overheads can be decreased by excluding pollings of servers.