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구리 분말과 피톤치드를 혼입한 모르타르의 기초 물성 평가
김일순 ( Kim¸ Il-sun ),김우현 ( Kim¸ Woo-hyun ),이재욱 ( Lee¸ Jae-wok ),최소영 ( Choi¸ So-yeong ),양은익 ( Yang¸ Eun-ik ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구에서는 구리 분말과 피톤치드가 동시에 혼입된 모르타르의 플로, 휨 강도, 압축 강도 및 염화물 침투 저항성을 평가하였다. 실험결과, 플로 값은 기준 배합 대비 약 2% 내외로 감소하거나 증가하는 경향을 나타내었다. 모르타르의 휨 및 압축 강도는 기준 배합과 유사한 경향을 나타내었다. 염화물 침투 저항성에서는 확산계수가 기준 배합보다 감소하는 경향을 나타내었고, 구리 분말의 혼입율이 증가할수록 확산계수가 증가하는 경향을 나타내었다. 중금속인 구리 분말이 전도체 역할을 하여 염화물 침투 저항성에 영향을 준 것으로 판단된다.
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.
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/>
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.
무선 센서 네트워크에서 이동성 로봇을 이용한 센서 위치 인식 기법에 관한 연구
김우현 ( Woo-hyun Kim ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.2
Accurate and low-cost sensor localization is a critical requirement for the deployment of wireless sensor networks in a wide variety of application. Sensor position is used for its data to be meaningful and for energy efficient data routing algorithm especially geographic routing. The previous works for sensor localization utilize global positioning system(GPS) or estimate unknownlocation nodes position with help of some small reference nodes which know their position previously. However, the traditional localization techniques are not well suited in the senor network for the cost of sensors is too high. In this paper, we propose the sensor localization method with a mobile robot, which knows its position, moves through the sensing field along pre-scheduled path and gives position information to the unknown-location nodes through wireless channel to estimate their position. We suggest using the sensor position estimation method and an efficient mobility path model. To validate our method, we carried out a computer simulation, and observed that our technique achieved sensor localization more accurately and efficiently than the conventional one.
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.
건설프로세스 기본설계 단계에서의 의사결정 효율성 향상방안에 관한 기본 연구
김우현(Woo-hyun Kim),임재복(Jae-bok, Lim),김주형(Ju-Hyung Kim),김재준(Jae-Jun Kim) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
The process in the phase of design development is not efficient. When the ordering organization and the design firm make a decision of the design, there is dalliance during preparing formal document for discussion, moving from company to company, and again. If there is efficient system for making decision, it is possible to shorten the period of the project, and save the budget. In this study, BIM, coordination are the key words for the improvement.
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.