연소방식별 폐기물 고형연료(RDF)의 연소특성 연구

김우현,Kim Woo-Hyun 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.1

폐기물고형연료(RDF : Resused Derived Fuel)를 연료로 하는 연소기술의 개발을 위하여 기포유동층 연소로와 순환유동층 연소로, 연속연소식 연소로, 회분식 연소로 등 다양한 연소장치를 이용하여 연소 특성실험을 하였다. 여러 종류의 연소설비에서 RDF의 연소 및 배출가스 특성을 비교, 분석하였으며 RDF 전용 연소설비에 대하여 보다 깊은 연구의 기초 자료로 활용하자고 하였다. 기포 유동층 및 순환유동층연소로에서는 적정투입량과 가스공탑속도등 적정운전조건에 따라 안정적인 연소가 이루어지는 것을 확인할 수 있었다. 순환유동층 연소로에서 연소조건에 따라 연료 중의 질소성분과 연소공기 중의 산소와의 반응이 커져서 NOx의 농도가 높아지는 것을 알 수 있었으며 $SO_2$는 매우 낮은 농도로 측정되어 RDF의 유동층 연소시 거의 발생하지 않는 것으로 판단되었으며, HCl의 경우 평균 36.4ppm으로 배출허용기준치보다는 낮으나 저감대책이 필요한 것으로 판단되었다. 연속연소식 연소로와 회분식 연소로의 경우 성형 RDF와 fluff RDF를 비교 실험한 결과 높은 밀도를 가진 성형 RDF의 연소가 안정적인 열회수 측면에서 더 유리한 것을 알 수 있었으며 배가스 특성은 비슷한 값을 나타내었으며 배출가스 특성은 비슷하였다. For the development of combustion technology of RDF(refuse derived fuel), combustion characteristics are examined in bubbling fluidized bed, circulating fluidized bed, continuos combustor and batch type combustor. The characteristics of combustion and exhaust gas has been compared and analyzed in many type of combustion facilities, which has been utilized as basic data for the advanced research of specified RDF combustion facility. Stable combustion has been observed in bubbling and circulating fluidized bed from controled operating condition like the proper feeding rate and superficial gas velocity. In circulating fluidized bed, concentration of NOx has been increased with the operating condition by the fuel-NO and oxygen reaction and $SO_2$ can be considered not to be produced in RDF fluidized bed from very low concentration in flue gas. HCl concentration is 36.4 ppm as average value and lower than standard emission value, but the counter plan is needed. Shaped RDF and fluff RDF have been compared in continuos combustor and batch type combustor and shaped RDF shows benefit for the stable heat recovery and gas emission shows similar value and characteristics.

기하학적 모델 및 색상 모델에 기반한 이동물체 추적에 관한 연구

김우현(Woo-hyun Kim),기창두(Chang-doo Kee) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5

As there have been many interests about a real-time detection in a face recognition field, the research of face detection is being progressed lively through skin-color model for quick processing. However, if the color of background and skin-color is almost alike, unexpected recognition will happen. Also, face recognition which is a important field of pattern-recognition includes complex difficulty like size, shape, and position of target object, background, and lighting, but the faces give us wide information like inherent face-color, head movement, face shape, eyes, a nose, a lip.<br/> Using this much information, we present face-tracking method in this paper by combining skin-color chaser and ellipse chaser in given conditions.<br/> We use ellipse chaser as the first algorithm, and skin-color chaser which has human's skin-color. By experiment using two chasers, this algorithm shows robustness in face-tracking<br/> <br/>

노출형 철골주각부의 지압강도에 관한 실험적 연구

임우현(Woo Hyun Lim),민병열(Byung Yeol Min),최문식(Mun Shik Choi),김규석(Kyu Suk Kim) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2

The problem of large concentrated forces acting over limited areas of concrete is one of frequent occurence in civil engineering design. Steel base plates of stanchions over concrete footing, anchorages in post-tensioned concrete beams, shear keys in composite structures, concrete beams at bearing, bridge bearings over piers, concrete hinges and bearing blocks, beams over walls and concrete columns and pile heads, etc., are a few instances of bearing problems. The experimental studies for bearing strength of concrete were reported so far by previous investigators, and the formulars were recommended in codes of practice of various countries. In this study, the obtained results of the test are presented. The results show that the major testing parameters are the ratio of bearing area to the concrete area and the size of specimen.

신경회로망을 이용한 자동차 번호의 인식

김우현 ( Woo-hyun Kim ),박동웅 ( Dong-wung Park ) 한국고등직업교육학회 1999 한국고등직업교육학회 학술대회 논문집 Vol.1999 No.11

This paper describes algorithm to extract license plates in vehicles. Neural networks have been trained to perform complex functions in various fields of application including pattern recognition, identification, classfication, speech, vision and control systems. Today, neural networks can be trained to solve problems that are difficult for conventional computers or humanbeing. The recognition methods using neural networks have two ones. In this paper, First, we input the normalized self-image and learned the real image. Second, we extracted charastic vector and learned it. But, the former is ideal method that is required many units according to resolution. Also, in increasing interconnection number, it takes many time to recognize an image. The latter has a decreasing problem of recognition and merits to reduce units and interconnection number in a few input. Simulation shows that the proposed algorithm having character recognition system using multi-layer neural networks improves the recognition rate in various learning data.

선형 모델추종제어되는 유도전동기에서 견실제어기 설계

김우현(Woo-Hyun Kim),윤경섭(Kyung-Sup Youn),권우현(Woo-Hyen Kwon) 제어로봇시스템학회 1999 제어·로봇·시스템학회 논문지 Vol.5 No.4

Reed-Solomon부호의 복호를 위한 수정 유클리드 알고리즘의 효율적인 반복 셀 구조

김우현,이상설,송문규,Kim, Woo-Hyun,Lee, Sang-Seol,Song, Moon-Kyou 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.1

Reed-Solomon(RS) 부호는 CD-ROM, HDTV, ATM 그리고 디지털 VCR 등 여러 분야에서 연집(burst) 오류를 정정하기 위해 적용되어 왔다. RS 부호를 복호하기 위해서는 Berlekamp-Massey 알고리즘, 유클리드 알고리즘 그리고 수정 유클리드 알고리즘(MEA)이 개발되었다. 최근에는 이들 중에서도 MEA가 가장 자주 사용되었다. 본 논문은 부호의 복호에 사용되는 MEA을 위한 효율적인 반복 셀 구조를 제안한다. 제안된 구조의 두 가지 주된 특징은 다음과 같다. 첫째, MEA의 수행에 있어 기존의 방법[1] 보다 약 25% 적은 수의 클럭 사이클을 이용한다. 둘째, MEA 수행에 소비되는 클럭 사이클의 수가 부호의 길이 n보다 큰 경우 MEA 셀의 개수를 줄일 수 있었으며, 수신된 워드를 위한 버퍼 요구량 또한 줄일 수 있었다. 예로써 (128,124) RS 부호에 대한 MEA 회로가 VHDL을 통하여 기술되고 검증된다. Reed-Solomon(RS) codes have been employed to correct burst errors in applications such as CD-ROM, HDTV, ATM and digital VCRs. For the decoding RS codes, the Berlekamp-Massey algorithm, Euclidean algorithm and modified Euclidean algorithm(MEA) have been developed among which the MEA becomes the most popular decoding scheme. We propose an efficient recursive cell architecture suitable for the MEA. The advantages of the proposed scheme are twofold. First, The proposed architecture uses about 25% less clock cycles required in the MEA operation than[1]. Second, the number of recursive MEA cells can be reduced, when the number of clock cycles spent in the MEA operation is larger than code word length n. thereby buffer requirement for the received words can be reduced. For demonstration, the MEA circurity for (128,124) RS code have been described and the MEA operation is verified through VHDL.

군복무 만족도와 군수분야 제요소간의 인과관계 분석

김우현,최용석,Kim, Woo-Hyun,Choi, Yong-Seok 한국통계학회 2012 Communications for statistical applications and me Vol.19 No.3

해병대에 근무하는 병사들의 복무만족도, 특히 군수지원 측면에서 얼마나 만족하는지 알아보기 위해 군수분야 제 요인들에 대한 상호 인과관계를 구조방정식 모형을 이용하여 분석하였다. 이를 위해 해병대 복무만족도, 보급의만족도, 신뢰성, 적시성, 적절성, 군수품의 경제적운용 총 6개의 변수를 사용하여 각 변수들 간의 영향, 그리고 최종적으로 해병대 복무만족도에 어떻게 영향을 미치는지 알아보았다. 분석대상은 단순히 해병대 전체 병사로 국한하지 않고 접적지역과 후방지역 근무자들로 구분하여 알아보았다. 그 결과 양개지역 모두 보급물량의 적절성을 가장 중요하게 생각하였으며 접적지역은 보급의 적시성, 후방지역은 신뢰성이 가장 중요하게 여기는 것을 고려해 볼 때 지역적 특성이 반영된 것을 알 수 있었다. 분석방법은 군 특성상 많은 표본의 확보가 어렵고 특히 접적지역 부대는 더욱 어려워 전통적인 LISREL대신 PLS(partial least square) 방법을적용하고, 설문자료가 리커트척도에 의한 순서형자료임에 따라 연속형자료로 전환하여 분석함으로서 통계분석의 정확도를 보다 더 높일 수 있도록 하였다. This study is to understand the logistic area effect for the satisfaction of military service; service people work the unit of Marine Corps which is close or far away from North Korea and infantry people from the structural equation models based on the component based method(PLS). From the result, we note that the trustworthy and suitability of supply are the most important factors in their of military service satisfaction for Marine Corps.

고정자 전류와 자속의 오차를 이용한 벡터제어 유도전동기의 회전자 시정수 보상

김우현(Woo-Hyun Kim),박철우(Chul-Woo Park),임성운(Sung-Woon Im),권우현(Woo-Hyen Kwon) 제어로봇시스템학회 2000 제어·로봇·시스템학회 논문지 Vol.6 No.5

티타늄 임플란트의 항균코팅 동향

김우현(Kim Woo Hyun),김경남(Kim Kyoung Nam) 대한치과의사협회 2010 대한치과의사협회지 Vol.48 No.2

Titanium and titanium alloys are the most common materials used for dental and biomedical implants, owing to their biocompatibility and favourable mechanical properties. However infection of the region surrounding a dental implant by pathogenic microorganisms is a significant factor in implant failure. Prevention and control of microbial colonization of implant surfaces is considerable interest to the biomedical community. One important strategy is to render the implant surface antibacterial by impeding the formation of biofilm. A number of approaches have been proposed for this purpose. Therefore, we reviewed the researches of antibacterial coatings on titanium implants in this articles.

디지털 역결상 보호 계전기의 설계 및 제작

김우현,길경석,김성욱,Kim, Woo-Hyun,Kil, Gyung-Suk,Kim, Sung-Wook 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.4

Induction motors connected with a three-phase AC system may malfunction due to reverse phase or open phase faults. Conventional overcurrent relays and overheating relays are used to prevent such accidents; however, their drawbacks include a low response speed and false operation. Therefore, in this study, a digital relay for the reverse-open phase was designed and fabricated. This relay can detect the reverse phase and open phase faults and send a trigger signal to the control circuit. The proposed relay was developed based on a microcontroller. The detection times of the reverse phase and open phase were verified as 320ms and 80ms, respectively. Compared with conventional relays that only protect the motor from one type of fault, the proposed relay can detect both, reverse phase and open phase faults. In addition, the fault detection, identification criterion, and trigger signal patterns can be modified by programming according to the requirements of users.