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김현표,김남득,염영일,변시명 ( Hyun Pyo Kim,Nam Deuk Kim,Young Il Yeom,Si Myung Byun ) 생화학분자생물학회 1999 BMB Reports Vol.19 No.2
Urokinase was covalently immobilized to a cellulose hollow fiber membrane with the method of CNBr-activation. The resulted immobilized urokinase showed 19-38×10^(-3) CTA unit/cm fiber compared to 17-30×10^(-3) CTA unit/㎝ fiber of the simply adsorbed urokinase which showed the least stability during repeated use. The fibrinolytic activity of the immobilized one was very stable and the immobilized fiber promised a potential clinical use.
해상용 3축 위성 안테나 다물체 동역학 및 제어 모델의 실험적 검증
김현일(Hyun-il Kim),김성수(Sung-Soo Kim),원문철(Mooncheol Won),윤진섭,Ki-sang Hwang 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Simulation based design technique is vary effective to design such antenna, since the development cost can be reduced. According to the design procedure, multibody model has been refined to carry our multibody dynamics and control simulations. Based on the design, actual hardware prototype has been fabricated. Before the actual marine test of the prototype is performed with an experimental boat, validation of the computer model have been carried out in order to study every possible cases with the experimental boat. For such validation purpose, ship motion simulator which can generate roll-pitch-yaw motion of the ship is used.
소유구조가 기업정보공개활동에 미치는 영향 : 최대주주지분율과 외국인지분율을 중심으로
김현일(Kim Hyun il),안미강(Ahn Mi Gang),고대영(Ko Dae Young) 한국국제회계학회 2011 국제회계연구 Vol.0 No.35
주주들은 자신의 부를 위하여 경영자를 효율적으로 통제하려 하거나 기업의 정보를 적극적으로 습득하기 위하여 노력한다. 이러한 주주들의 정보습득 욕구를 충족시키기 위하여 시행된 각종 공시제도를 통해 기업은 자발적으로 정보를 외부에 알리도록 되었다. 그러나 공시활동은 경영통제수단 등 여러 가지 요인에 의해 영향을 받을 수 있다. 본 연구에서는 그 중에서도 기업소유구조를 중심으로 대주주지분율과 외국인지분율이 기업정보 공개활동에 어떠한 영향을 미치는지 알아보고자 한다. 2003년부터 2006년까지 기업설명회를 개최한 299개 기업을 포함한 전체표본 2,100개를 대상으로 분석한 결과, 개최여부에 대한 로지스틱분석에서 최대주주지분율은 유의한 음(-)의 계수를, 외국인지분율은 유의한 양(+)의 계수를 가졌다. 이는 최대주주지분율은 기업설명회 개최를 억제하는 반면, 외국인지분율은 개최를 유도하는 수단 중 하나임을 의미한다. 실시기업만을 대상으로 한 회귀분석에서도 지분율 변수가 모두 예상대로 유의한 회귀계수를 가져 최대주주지분율이 낮은 기업일수록 기업설명회를 더 자주 개최하며, 외국인지분율이 높은 기업일수록 기업설명회 개최횟수가 더 많아짐을 알 수 있었다. 이러한 결과는 외국인투자자가 기업에게 정보공시를 위한 외부활동을 유도함으로써 경영자의 기회주의적 행위에 대해 견제수단이 될 수 있음을 나타낸다. 통제변수 중에서는 기업규모, 연구개발비가 개최여부와 개최횟수 모두에 유의한 양(+)의 영향을 미쳤다. 즉 기업규모가 큰 기업일수록, 그리고 연구개발활동이 많은 기업일수록 기업설명회를 더 개최하고, 더 자주 개최함을 뜻한다. 본 연구는 기업설명회 개최를 촉진시키는 요인 중 하나로 소유구조에 대해 연구함으로써 지분율 차이와 공시정보간 관련성을 입증하였다. 소유구조가 기업의 자발적 공시 활동에 유의한 영향을 미치는 것으로 나타난 본 연구의 결과는 기업의 IR관련부서와 공시제도 관계당국에 시사점을 가질 것이며 이와 관련된 연구에도 도움이 될 수 있을 것으로 보인다. This study tests on firm disclosure for outside investor is guaranteed as ownership structure. An effective ownership structure diminishes agency problems by encouraging voluntary disclosure. But it is to be regretted with little study that ownership structure is improving voluntary disclosure to present in Korea. Hence, we study how ownership structure are associated with disclosure practice which are proxy for holding Investor Relations(IR) here. And the ownership structure were measured by the largest shareholder and foreign ownership. In our tests, sample firms were obtained from firms listed in the Korean Stock Exchange from 2003 to 2006. We consider IR frequencies made by 299(2,100-total sample firms) disclosed electronic disclosure systems from KINDS. In logistic regression, we found that ownership structure influenced a likelihood of holding IR significantly. And the regression results showed that the largest shareholder influenced inversely IR frequencies. And foreign ownership have positive relations with the IR frequencies. The results of the paper are expected to contribute to the betterment of the financial disclosure system by studying Investor Relations in Korea. Also our results suggest that foreign investors are responsible for monitoring managerial performance in general and disclosure practices in particular. It helps enhance shareholder value by protecting shareholder interests against managerial opportunism.
PEM 연료전지 스택의 과도상태 출력특성에 관한 실험적 연구
김현일(Hyun-il Kim),황재순(Jae Soon Hwang),정태용(Tae-Yong Chung),신동훈(Donghoon Shin),남진현(Jin Hyun Nam),김영규(Young-Gyu Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The transient power characteristics of a PEM fuel cell stack was experimentally studied using a commercial 1.2kW PEM fuel cell (Nexa™ Power Module, Ballard Power System Inc.). The conditions in PEM fuel cell stack such as temperature and water content change rather slowly because of their large heat capacity and long channel length, which results in long transient time to converge to a steady state. The steady characteristics of the PEM fuel cell module was determined first, followed by the measurement of its transient characteristics upon stepwise and continuous load current changes. During the stepwise current change from 5A to 25A, the output voltage initially decreased below the steady voltage and then increased gradually. Similar behavior was also observed for the stepwise current change from 25A to 5A. This transient behavior is explained with reference to the evolution of the temperature and water content of the PEM fuel cell stack.
김현일(Kim Hyun-Il),서승직(Suh Seung-Jik),강기환(Kang Gi-Hwan),유권종(Yu Gwon-Jong),박경은(Park Kyung-Eun),노지희(Noh Ji-Hee) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
It is well-known that most of the solar radiation absorbed by photovoltaic (PV) module is not converted to electricity but contributes to increase the temperature of the module, thus reducing the electrical efficiency. It is also important to consider building integrated Photovoltaic (BIPV) as an integral part of the environmental systems of a building if the application of BIPV is to be successful, because just applying PV onto already designed building envelope, and treating the PV system as an element as if independent from the building, will not enable optimum performance. In this paper, roof integrated PV modules are studied. : Indoor experiment and outdoor exposure experiment. Difference of temperature between the front and back of PV module is about 13.4~22.3℃. If each layer of PV module measures temperature, we will know about heat transfer of PV cell and change of thermal environment of indoors in detail. Therefore this paper presents the comparison of electrical, architectural and thermal performance of roof integrated photovoltaic(PV) modules, which is composed of different hybrid structure layer such as insulation.
김현일(Kim Hyun-Il),강기환(Kang Gi-Hwan),박경은(Park Kyung-Eun),유권종(Yu Gwon-Jong),서승직(Suh Seung-Jik) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.4
In 2008, the global photovoltaic(PV) market reached 5.6GW and the cumulative PV power installed totalled almost 15GW compared to 9GW in 2007. Due to a favourable feed-in-tariff, Korea emerged in 2008 as the 4th largest PV market worldwide. PV power installation rose 495.5 percent to 268MW in 2008 compare to 45MW in 2007. Building integrated photovoltaic(BIPV) has the potential to become a major source of renewable energy in the urban environment. BIPV has significant influenced on the reflection by rear materials such as white back sheet and the heat transfer through the building envelope because of the change of the thermal resistance by adding or replacing the building elements. In this study, to use as suitable building materials into environmentally friendly house like green home, characteristic analysis of BIPV module according to rear materials achieved. Electrical output of PV module with white back sheet is high about 10% compared to other pv module because of 83% reflectivity of white back sheet compared to 8.4% reflectivity of other PV modules with different rear materials(black back sheet and glass). In the result of outdoor experiment during a year, electrical output of four different PV module is decreased about 3.72%.