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Shanika N. Jayasekara(메쓰캄카남즈사니카닐란가니자야세카라),Wook H. Na(나욱호),Abdulhameed B. Owolabi(오우라비압둘하메드바바툰데),Jong W. Lee(이종원),Adnan Rasheed(라쉬드아드난),Hyeon T. Kim(김현태),Hyun W. Lee(이현우) (사)한국생물환경조절학회 2018 생물환경조절학회지 Vol.27 No.1
본 연구는 공기주입 이중피복온실과 관행 이중피복온실의 생육환경과 단열성능을 비교하기 위하여 수행하였다. 두 온실의 온도, 상대습도, 포차, 이산화탄소농도, 일사량, 딸기 생산량 및 난방연료소비량을 비교하였다. 공기주입온실이 관행온실보다 야간에 상대습도가 더 높고 포차는 더 낮게 나타나 딸기의 생육에 좋지 않은 환경을 보여주었다. 이산화탄소농도는 공기주입온실이 관행온실보다 더 높게 나타났으며, 이는 공기주입온실이 더 밀폐되어 있어 환기량이 적기 때문인 것으로 판단된다. 관행온실의 광투과율이 77%로 공기주입온실의 72%보다 더 높아 관행온실의 광환경이 더 우수한 것으로 나타났다. 관행온실의 딸기 생산량이 더 높게 나타났으며, 이는 관행온실의 생육환경이 공기주입온실보다 더 우수한 결과로 판단된다. 난방연료는 공기주입온실에서 더 적게 소모되어 공기주입온실의 단열성능이 더 우수한 것으로 나타났다. This study was conducted to determine which greenhouse provided good environmental conditions for strawberry production, and performed better at conserving energy. Temperature, RH, VPD, CO₂, solar radiation, yield, and fuel consumption were the parameters analyzed. The temperatures of both greenhouses were well controlled in order to provide optimal day and night temperatures for strawberry production. The air inflated double layer greenhouse had higher RH values (more than 90% at night), which led to higher disease occurrence, in comparison to the conventional double layer greenhouse. Furthermore, the air inflated double layer greenhouse had lower VPD values than the conventional double layer greenhouse. Therefore, better RH and VPD were observed in the conventional double layer greenhouse. Higher CO₂ concentration was observed in the air inflated double layer greenhouse while the conventional double layer greenhouse ventilated better than the air inflated greenhouse, because of its side ventilators. Moreover, higher solar radiation in the conventional double layer greenhouse resulted in higher yield, in comparison to the air inflated double layer greenhouse. Thus, we can conclude that the conventional double layer greenhouse provided a better environment for crop growth, in comparison to the air inflated double layer greenhouse. Regarding fuel consumption, the air inflated double layer greenhouse had lower fuel consumption than the conventional double layer greenhouse. Therefore, from an energy consumption point of view, we can conclude that the air inflated double layer greenhouse performed better than the conventional double layer greenhouse.
연료전지 전원 시스템의 설계 및 분석을 위한 PEMFC의 회로 모델
이수호(S. H. LEE),이현우(H. W. LEE),권순걸(S. K. Kwon) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
The Proton Exchange Membrane Fuel Cells (PEMFCs) are being used in a variety of applications including portable power generation, transportation and back-up power systems. In this paper presents a novel circuit model for a PEMFC that can be used to design and analyze fuel-cell power system. The Pspice-based model uses BJTs, L and C elements available in the Pspice library with some modification. The model includes the phenomen like activation polarization, ohmic polarization, and mass transport effect present in a PEM fuel cell. Simulated characteristics of the fuel cell were compared with the experimental results obtained on a commercial fuel cell.
나노 섬유 코팅을 위한 휴대용 소형 전기방사 장치 제작 및 평가
홍성욱(S.W.Hong),이현우(H.W.Lee),김일적(I.J.Kim),정진우(J.W.Jung),박찬(C.Park),정현석(H.S.Jung),조성진(S.J.Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Electrospinning is an economical and versatile method that is used to fabricate continuous ultrafine fibers. Conventional electrospinning manufacturing systems have systematic limitations such as bulky volume, expensive cost, and a wired power source. In order to overcome these shortcomings, we propose a novel portable electrospinning system based on a wireless power source and a high voltage amplifier, which can be operated with single hand. For safety, the system was contained an electrical safety circuit to prevent an electric shock. We confirmed that the portable system shows comparable performance to conventional bulky electrospinning systems. Our portable electrospinning system is expected to expand the application fields of the nanofibers in biomedical applications and cosmetic applications.
전중함(J. H. Chun),이현우(H. W. Lee),백수현(S. H. Baek),곽동걸(D. K. Kwak) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
In this paper discusses single-phase DC-AC Inverter design of reversible power converter that driven by binary combination at different transformer winding ratio by BCD code level. It has a advantage that constructs a control system simply and obtain load current of good quality without filter circuit and free from noise or isolation for lower switching frequency. In this research, study on current type converter and inverter circuit that consist for possibility of AC-DC/DC-AC multi-level reversible converter.
결핵환자에서 혈청 Angiotensin Converting Enzyme ( ACE ) 활성도와 Tuberculin 반응도의 관계에 대한 연구
조인호(I . H . Jo),도준영(J . Y . Do),김종호(J . H . Kim),이재익(J . Y . Lee),정재천(J . C . Jung),이현우(H . W . Lee),이영헌(Y . H . Lee) 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A Angiotensin converting enzyme (ACE) is reported to be elevated in patients with sarcoidosis, Gaucher`s disease, leprosy, silicosis, asbestosis, and histiocytic medullary reticulosis. The serum ACE activity was measured in 45 patients with tuberculosis, 6 patients with cnacer, and 50 normal controls. To investigate the correlation between serum ACE activity and delayed hypersensitivity, tuberculin skin tests were performed and the results were compared with serum ACE levels in patients with pulmonary tuberculosis. The results were as follows: 1) The serum ACE level in tuberculosis patients was not higher than in the normal control group (p>0.1). 2) The serum ACE level in cancer patients tended to be lower than in the normal control group(p<0.1). 3) A correlation between serum ACE activity and the severity of pulmonary tuberculosis was not present. 4) There was a significant inverse correlation between the diameter of the cutaneous reaction to tuberculin and serum ACE is not a useful parameter to indicate severity and progress of pulmonary tuberculosis and that there is an inverse correlation between delayed hypersensitivity and serum ACE level. We suggest that this inverse relationship results from competition for the relevant signal molecules on the macrophage surface.
이민기(M.K-Lee),고강훈(K.H-Koh),서기영(K.Y-Suh),권순걸(S.K-Kwon),임근희(G.H-Rim),이현우(H.W-Lee) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Magnetic flux saturation depend on phase of Initial input power to high voltage transformer used in Micro wave oven.<br/> To limit inrush current high voltage transformer the relay contact should be "on" when the lowest point of input voltage phase.<br/> The improved circuit is for compensate interrupt signal Micom mput so the relay contact can be "on" when the inrush current is lower.<br/> Test result adapted said improved circuit for input voltage variation mode comply the limit 50A of requirement.