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김기현,김경래,박완수,이은재,황영규,Kim, Kihyun,Kim, Kyungrai,Park, Wansoo,Lee, Eunjae,Hwang, Youngkyu 한국건설관리학회 2014 한국건설관리학회 논문집 Vol.15 No.2
On March, 2013, the Government announced the Multiple Prime Contract method will be expanded in public building construction projects. The applying multiple prime contract method has been immersing issue among all stakeholders of construction project. The owner conducts the role of a general contactor as well as owner's original responsibility while construction works being executed by specialty contractors. If the owner has not experience of project management, it should be bring about increasing management cost due to the interface problems among prime contractors. With this reason, it is difficult to administrate the multiple prime contract. So far there has been no methodology of predicting management cost in the multiple prime contract. Therefore, this study aims to enable the operation of efficient multiple prime contracts by developing a model to predict their management costs. 2013년 3월 정부에서는 공공공사에 분리발주방식을 확대적용하는 정책을 발표하였다. 분리발주방식의 도입을 두고 건설참여자들의 입장이 첨예하게 대립하게 되고, 건설분야의 뜨거운 이슈가 되고 있는 상황이다. 건설공사 관리의 경험이 부족한 공공발주자가 다수로 분리된 전문공종들을 직접관리하여 인터페이스의 증가에 따른 관리비용 상승, 실적 부족으로 인한 관리비용 산정 기준이 없어 사업운영에 어려움이 있는 현실이다. 따라서, 본 연구에서는 분리발주의 관리비용율 예측할 수 있는 모델을 개발하여 효율적인 분리발주의 운영이 가능하게 하는 것을 목적으로 하고 있다.
신규상장기업의 신속한 주식상장과 여유자원이 국제화에 미치는 영향
김기현,Kim, Kihyun 한국데이터전략학회 2022 Journal of information technology applications & m Vol.29 No.3
While there exists voluminous literature on the internationalization of the firms, it has focused on mature firms or born-global firms. There is still a lack of research on firm that is in the growth stage between venture and mature firm. To fill this gap, this paper focuses on the newly public firm which is enter the stock market through initial public offerings (IPO). Specifically, I examine the relationship between the early listing and internationalization. In the venture firm aspect, the decision of the IPO necessary to allow to change organization structure, ownership and take a risk from environmental movements. This paper suggests early listing is a behavior of entrepreneur orientation. According to empirical results, there is a positive relationship between early listing and internationalization. It implies that early listing may help international expansion by sourcing finance, reputations from market. Furthermore, this study emphasizes the importance of financial slack resources to international expansion. I conclude that ventures need not only early entering in stock market but also securing sufficient financial slack resources to achieve sustainable growth in the international market.
고속CCD카메라를 이용한 비행골프공의 데이터 측정 시스템
김기현(Kihyun Kim),조재익(Jaeik Jo),윤창옥(Changok Yun),박현우(Hyunwoo Park),주우석(Woosuk Joo),이동훈(Donghoon Lee),윤태수(Taesoo Yun) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2
Recently, while 3D sports game increases, the research that it recognizes the operation of the real user actively progresses. Most of all, the research about the golf is active. In this paper, the image acquiring in a high-speed CCD camera measures the flight data of the golf ball through the image processing. While photographing, the high-speed camera, using this system, exposes an image at regular intervals. And line scan camera checks whether the golf ball passed or not. After the location information of the calculated golf ball calculates a speed and a direction by using the physical formula, it applies the golf simulation. 최근 체감형 스포츠 게임이 늘어나면서 실제 사용자의 동작을 인식하는 연구가 활발히 진행 중이다. 그 중에서도 골프에 관한 연구가 활발하다. 본 논문에서는 고속CCD카메라를 이용하여 골프공의 비행데이터를 측정한다. 고속CCD카메라는 촬영 시, 한 장의 이미지에 여러 번의 노출을 이용하여 고속으로 촬영하여 획득한 영상은 영상처리과정을 통하여 촬영된 공의 위치를 측정한다. 계산된 골프공의 위치는 물리공식을 이용하여 골프공의 비행데이터인 속도, 날아가는 방향을 계산한다. 본 시스템은 향후 비행하는 골프공뿐만 아니라, 야구, 테니스 등과 같은 타격 스포츠에서 체감형 게임 형태로 적용이 가능하다.
1차원 열 유동 시뮬레이션 프로그램을 이용한 대형 CNG엔진의 축 출력 및 열 회수량 예측
김기현(Kihyun Kim),장진영(Jinyoung Jang),배충식(Choongsik Bae),최재준(Jaejoon Choi),오만수(Mansoo Oh),김동명(Dongmyung Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
CNG(Compressed natural gas) is very attractive fuel as alternative of gasoline and diesel. In order to meet stricter emission regulation on NOx and PM(PM; particulate matter), CNG has been applicated to heavy duty engine class. This study was anlysis of effects of fuel injection system on power and heat transfer rate. Two type of engine models were used to perform this study. First thing was a air-mixer type and second was the In-cylinder direct injection type using injector. Model which simulates Heavy duty 16 cylinder 48 L CNG engine was made for simulation. It is including flow line of intake and exhaust, cylinder, ambient and turbocharging system. Basic theory is 1-dimensional heat flow dynamics. Model can be validated by using spec of the real engine system. Additionally direct injection system was applied to model instead of air-mixer type fuel system. As parameters for simulation, intake pressure and equivalence ratio are selected. The result is concluding the difference between two systems was about 10% in volumetric efficiency in all range of operation. The conditions of mixture in intake and compression process between two systems were slightly different . In-cylinder direct injection system could make higher peak power and peak heat transfer rate than those of mixer type. Total system efficiency was also higher in case of In-cylinder direct injection system.
가솔린과 디젤을 연료로 적용한 대형 디젤 엔진에서 분사기 형상이 연소 및 배기 배출물에 미치는 영향
김기현(Kihyun Kim),김동훈(Donghoon Kim),정용진(Yongjin Jung),배충식(Choongsik Bae) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Experimental study was performed to investigate effects of various injector configurations on combustion and exhaust emissions in a heavy duty diesel engine fueled with gasoline and diesel. Including baseline injector which has 8 holes and 146° injection angle, five kinds of injector with different injection angle and number of nozzle hole were used for the study. Engine was operated at low speed and load conditions. Stable engine operation for gasoline was not achieved with baseline injector under naturally aspirated condition. Engine operation was become stable only when high boosting pressure was applied. However, it was possible to achieve more stable engine operation with injectors of narrow injection angle compared to baseline injector at same intake pressure. Over the whole injection timing range, gasoline combustion shows longer ignition delay and retarded combustion phase than those of diesel. This trend enables to obtain higher power output at early injection timing for gasoline compared to diesel. However, high HC and CO were emitted under these early injection timing range so narrow injection angle injector was used to reduce these emissions by spray targeting technology. Consequently, low load operation using gasoline was realized with lower emission and comparable power output compared to diesel combustion.
MCFC anode 대체 전극 개발을 위한 분말 알루미나 상의 무전해 Ni 도금 연구
김기현(Kihyun Kim),조계현(Kyehyun Cho) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.3
The typical MCFC (molten carbonate fuel cell) anode is made of Ni-10%Cr alloy. The work of this paper is focused concerning long life of anode because Ni-10% Cr anode is suffering from sintering and creep behavior during cell operation. Therefore, Ni-coated Alumina powder(20 ㎛) was developed by electroless nickel plating. Optimum condition of electroless nickel coation on 20 ㎛ alumina is as follows: pH 11.7, temperature 65~80℃, powder amount 100 d㎡/l. The deposition rate for Ni-electroless plating was as a function of temperature and activation energy was evaluated by Arrhenius Equation thereby activation energy calculated slope of experimental data as 117.6 kJ/mol, frequency factor(A) was 6.28×10¹? hr?¹, respectively.
타이어 특성을 고려한 차량의 선회 제동 안정성에 대한 연구
김기현(Kihyun Kim),김종찬(Jongchan Kim),이경민(Kyungmin Lee),정철호(Chulho Jung),서명규(Myungkyu Seo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Recently, as interest of consumers in stability of vehicles under high speed is increasing, performance of vehicle under high speed cornering condition has been developed rapidly. In addition, it is essential for research on the vehicle stability in accordance with characteristics of automobile parts. In this paper, we studied on the stability of vehicle using Brake-in-Turn simulation maneuver. To achieve this, we firstly developed vehicle model with 24-DOF using SPMD(Suspension Parameter Measuring Device) and MF(Magic Formular) tire model based on force and moment test data such as braking, cornering, and combined slip etc.. Also, we analyzed the vehicle stability in accordance with characteristics of tire and wheel combination of vehicle through simulation. Finally, we verified the validity of simulation results through outdoor vehicle test.
김기현(Kihyun Kim),이재각(Jaegak Lee),유봉조(BongJo Ryu),김지환(Jiwhan Kim),구경완(Kyungwan Koo) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.5
육지부 지열의 지중열교환기 타입은 수직밀폐형, 지중수평형, 에너지파일형, 스탠딩컬럼웰형 네가지 방식으로 구분되어지며, 각 타입별 성능평가 방식은 한국에너지공단 신 · 재생에너지 설비의 지원 등에 관한 지침 중 별표1의 신 · 재생에너지 설비 원별 시공기준(제7조제1항 관련)을 적용하여 KOLAS 인증기관으로부터 별표3의 ‘1. 지중열전도도 측정기준’[1]에 따라 측정한 열전도도 값을 지열이용검토서 작성기준에 맞게 적용하여 설계한다. 그러나 제주도의 지열 지중열교환기 타입은 평가 방법이 없는 상황이다. 이에 본 연구에서는 제주형 지중열교환기 성능 평가 방법을 제안하고자 한다.