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시설원예용 대온도차 지열원 히트펌프 운전비용 효과 분석
강신형(Shin-Hyung Kang),박승병(Seung Byung Park),최종민(Jong Min Choi) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.1
It is very important to obtain a out-of season production in horticultural greenhouses corresponding with higher crop prices. A ground source heat pump system has been highly spotlighed as an energy efficient heating system for the greenhouse. This paper investigated the operating cost of the ground source heat pump system with the variation of generating temperature and designing methods for heating system of the greenhouse. Even though the COP of the ground source heat pump system decreased with an increment of generating temperature in heating mode, the operating cost could be reduced. By adopting the high temperature heat pump system and heat storage tank, it could be achieved to save energy and reduce the operating time of auxiliary oil heating system for producing good plant-growth in the greenhouse.
지열원 멀티 열펌프 시스템의 시설원예 적용 난방성능 특성 실증 연구
강신형(Shin-Hyung Kang),최종민(Jong Min Choi),문제명(Jemyung Moon),권형진(Hyungjin Kwon) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.6
Good plant-growth conditions can be achieved by means of using greenhouses. One of the main issues in greenhouse cultivation is energy savings through the development of high efficient heating and cooling system. GSHPs are one of the recommended systems to cope with this pending need. The aim of this study is to investigate the heating performance of ground source multi-heat pump system installed in a greenhouse under part load conditions. Daily average heating COP of the heat pump unit was very high by at least 7.4, because of relatively large condenser, evaporator, and mass flow rate through ground loop heat exchanger. However, the system COP, overall heating coefficient of the performance of the system with heat pump unit and GLHX, decreased drastically due to relatively large power consumption of circulating pump under part load condition. It is suggested that the technology to enhance the performance of the ground source multi-heat pump system for a greenhouse under part load conditions should be developed.
국제 기업벤처캐피탈 투자에서 벤처기업의 파트너 불확실성 완화
강신형 ( Shin Hyung Kang ),배종태 ( Zong Tae Bae ) 한국중소기업학회 2016 기업가정신과 벤처연구 Vol.19 No.1
벤처캐피탈 시장에서 기업벤처캐피탈(CVC)의 중요성에도 불구하고 국제 CVC 투자에 대한 학술적 연구는 부족한 실정이다. 벤처기업은 국내 CVC 투자를 유치하는 경우보다 국제 CVC 투자를 유치하는 경우 지리적 및 문화적 거리로 인해 기술 유출의 위험을 더 크게 인식한다. 특히 벤처기업은 파트너 불확실성이 높은 CVC 투자를 받지 않으려는 성향을 보이기 때문에 본 연구는 국제 CVC 투자가 발생할 가능성은 후속라운드로 갈수록, 벤처기업이 속한 산업의 지적재산권 보호 수준이 높을수록, 그리고 기업투자자가 벤처기업의 잠재적 경쟁자가 아닐수록 증가할 것으로 예상한다. 추가적으로 본 연구는 벤처기업의 보완적 자원에 대한 필요성이 국제 CVC 투자에서 발생하는 파트너 불확실성에 어떤 영향을 미치는지 살펴보고자 한다. 이를 위해 1994년에서 2009년 사이 미국에서 발생한 2,873 건의 CVC 투자 건수를 분석하였다. 그 결과 벤처기업의 지적재산권 보호 수준과 기업투자자와의 산업 비관련성이 국제 CVC 투자에서의 파트너 불확실성을 감소시키는 영향이 있음을 확인하였다. 또한 이 요인들의 영향은 벤처기업이 어떤 보완적 자산을 필요로 하는지에 따라 강화되기도 혹은 약화되기도 함을 살펴볼 수 있었다. Despite the growing importance of corporate venture capital (CVC) in the venture capital market, little scholarly attention has been devoted to cross-border CVC investment. Venture firms perceive higher risks of technology leakage in cross-border CVC investment than they do in domestic CVC investment due to geographical and cultural disparity. Given that venture firms would not receive CVC investment in the presence of the partner uncertainty, we argue that the likelihood of cross-border CVC investment increases with the strength of intellectual property protection (IPP) regime, the investment timing (i.e. funding round number), and the industry unrelatedness with the corporate investor. Additionally, we investigate how the venture firm’s complementary resource need interact with the partner uncertainty in decisions for cross-border CVC investment. By examining 2,873 CVC investment transactions in the period 1994-2009, we found supporting evidence for the strength of IPP regime and the industry unrelatedness in mitigating the partner uncertainty of foreign corporate investors. However, the effectiveness of these factors is moderated by the type of resources that the venture firms need from the foreign corporate investors.
임형수(Hyung Soo Lim),임영천(Young Cheon Lim),송성진(Seung Jin Song),강신형(Shin Hyoung Kang),양수석(Soo Seok Yang) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
In this research, experimental investigation has been observed to enhance 4 stage axial compressor stability by steady air injection. By injecting air in front of 1st stage rotor tip, compressor operation range was extended about 4% based on no injection condition. The stall onset stage, signal frequency and stall cell feature were analyzed and these characters were compared with no injection condition's. Even though, no significant different was detected in steady air injection, except stall onset performance point, this results can be used as a reference for selecting injection stages in multistage compressor.
임형수(Hyung-Soo Lim),조민기(Min-Ki Jo),강신형(Shin-Hyoung Kang),송성진(Seung-Jin Song) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
Experimental research has been observed to investigate stall inception characteristics in 4 stage axial compressor. To analyze instantaneous static pressure signal which was measured using a fast response pressure sensor, the signal was decomposed into shaft resolved component, periodic and aperiodic revolution components for two kinds of flow rates. In both flow rates, shaft order periodicity was confirmed by signal decomposition. However, at low flow rate, the amplitude of aperiodic revolution component was 50 percent bigger than that of high flow rate. It means that at high flow rate, circumferential static pressure field is more stable than low flow rate condition. The compressor performance test was performed in no-stall, stall onset and fully developed stall conditions. Even in stall condition, dimensionless performances of three different shaft speeds were corresponded well. The frequency of shaft order perturbation, mode and fully developed stall were analyzed by frequency analysis methods.