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노치권(외 6명) 신라대학교 자연과학연구소 2012 自然科學論文集 Vol.22 No.-
To study fauna of Silla University located in Mt. Baek-yang, we conducted six surveys from 29 May 2011 to 28 April 2012. We found five phyla 41 orders 197 species of animals inhabiting in this area: four phyla 27 orders 163 species of invertebrates and in vertebrates one order six species of fishes, three orders nine species of amphibians and reptiles, six orders 14 species of aves, and four orders five species of mammals. Of these species, some Korean endemic species were included: a fish of Rhodeus uyekii in a pond near main gate of this university, a frog of Rana coreana in a creek near a dormitory, and a rabbit of Lepus coreanus and a water deer of Hydropotes inermis in a grass region near a main stadium. A kind of hawk, Falco tinnunculus as a natural monument (animal) of no. 323-8, was observed on a building of medical and life science. A blue frog of Hyla japonica as a variation was found near a spring resort. Therefore, this area is considered an ecologically important area having a high animal diversity.
건물에너지시뮬레이션을 활용한 연동형 온실 및 작물에너지모델 설계 및 이의 냉·난방부하 산정
이승노(Seung-No Lee),박세준(Se-Jun Park),이인복(In-Bok Lee),하태환(Tae-Hwan Ha),권경석(Kyeong-Seok Kwon),김락우(Rack-Woo Kim),여욱현(Uk-Hyeon Yeo),이상연(Sang-Yeon Lee) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.2
The importance of energy saving technology for managing greenhouse was recently highlighted. For practical use of energy in greenhouse, it is necessary to simulate energy flow precisely and estimate heating/cooling loads of greenhouse. So the main purpose of this study was to develope and to validate greenhouse energy model and to estimate annual/maximum energy loads using Building Energy Simulation (BES). Field experiments were carried out in a multi-span plastic-film greenhouse in Jeju Island (33.2°N, 126.3°E) for 2 months. To develop energy model of the greenhouse, a set of sensors was used to measure the greenhouse microclimate such as air temperature, humidity, leaf temperature, solar radiation, carbon dioxide concentration and so on. Moreover, characteristic length of plant leaf, leaf area index and diffuse non-interceptance were utilized to calculate sensible and latent heat exchange of plant. The internal temperature of greenhouse was compared to validate the greenhouse energy model. Developed model provided a good estimation for the internal temperature throughout the experiments period (coefficients of determination > 0.85, index of agreement > 0.92). After the model validation, we used last 10 years weather data to calculate energy loads of greenhouse according to growth stage of greenhouse crop. The tendency of heating/cooling loads change was depends on external weather condition and optimal temperature for growing crops at each stage. In addition, maximum heating/cooling loads of reference greenhouse were estimated to 644,014 and 756,456 kJ·hr<SUP>-1</SUP>, respectively.
복합재 접착 체결 구조의 접착 상태가 모드 I 균열 성장 특성에 미치는 영향에 대한 연구
노해리 ( Hae-ri No ),전민혁 ( Min-hyeok Jeon ),조현준 ( Huyn-jun Cho ),김인걸 ( In-gul Kim ),우경식 ( Kyeong-sik Woo ),김화수 ( Hwa-su Kim ),최동수 ( Dong-su Choi ) 한국복합재료학회 2021 Composites research Vol.34 No.5
본 논문에서는 불균일한 접착 상태를 가지는 복합재 접착 체결 시편에 대하여 모드 I 하중에서의 파괴 특성을 분석하였다. 이를 위하여 Double Cantilever Beam(DCB) 시험을 수행하였으며 모드 I 파괴 인성을 도출하였다. 불균일한 접착 상태를 갖는 시편의 경우 안정한 균열 성장 구간과 불안정한 균열 성장 구간이 나타남을 확인하였다. DCB 시험에서 구한 하중-변위 선도와 시편의 파손 단면을 통해 각 구간의 파괴 특성을 관찰하였다. 시험에서 측정된 균열 길이를 기준으로 세분화된 구간과 각 구간의 모드 I 파괴 인성을 이용하여 유한요소해석을 수행하였다. DCB 시험 결과와 유한요소해석 결과를 통해 불균일한 접착 상태를 가지는 시편의 파괴 거동을 모사할 수 있음을 확인하였다. In this paper, the characteristics of fracture in mode I loading were analyzed for adhesively bonded joints with non-uniform adhesion. The Double Cantilever Beam test was performed and mode I fracture toughness was obtained. In the case of non-uniform adhesively bonded joints, the stable crack growth sections and unstable crack growth section were shown. The fracture characteristics of each section were observed through the load-displacement curve of the DCB test and the fracture surface of the specimen. Finite Element Analysis was performed at the section based on segmented section by crack length measured through the test and using the mode I fracture toughness of each section. Through DCB test results and finite element analysis results, it was confirmed that the fracture behavior of specimens with non-uniform adhesion can be simulated.
윈치커튼식 계사의 시기 및 작업자 출입에 따른 분진 발생 농도 측정 연구
조예슬,권경석,이인복,하태환,박세준,김락우,여욱현,이상연,이승노,Jo, Ye-seul,Kwon, Kyeong-seok,Lee, In-bok,Ha, Tae-hwan,Park, Se-jun,Kim, Rack-woo,Yeo, Uk-hyeon,Lee, Sang-yeon,Lee, Seung-no 한국농공학회 2015 한국농공학회논문집 Vol.57 No.6
Improvement in domestic poultry production has a positive effect on the export competitiveness of the poultry industry. However, overproduction and enlargement of facilities to assure a supply increase a stocking density which make a poor environment in the broiler house. In particular, an intensive rearing environment is vulnerable to dust control that causes respiratory diseases, such as asthma, bronchitis, etc., to farmers and broilers. However, monitoring data and research for environment control are not adequate, and there are no air quality regulations in broiler houses in Korea. In this study, TSP, PM10, inhalable dust and respirable dust concentration were monitored according to season, age of broiler and broiler's activities. Air quality assessment was also performed in accordance with the threshold limit value by Donham et al. (2000). The TSP concentrations were 77.5 %, 219.7 % higher and PM10 concentrations were 121.2 %, 303.8 % higher when change of season and winter respectively than summer. There were significantly different concentrations according to season and age of broiler. Inhalable and respirable dust concentration were also clearly different according to the season and age of broiler. A high dust concentration was observed, specifically exceeding the threshold limit by 119 % in the winter. In the case of the broiler's motion was activity according to worker's access into the broiler house, concentration level was 769.6 % higher than broiler's motion was stable and exceeded the threshold limit. These results suggest that the worker should put on protective equipment to protect there's respiratory health in the broiler house.
전산유체역학을 통한 간척지 내 벤로형 온실의 자연환기량 분석
이상연,이인복,권경석,하태환,여욱현,박세준,김락우,조예슬,이승노,Lee, Sang-Yeon,Lee, In-Bok,Kwon, Kyeong-Seok,Ha, Tae-Hwan,Yeo, Uk-Hyeon,Park, Se-Jun,Kim, Rack-Woo,Jo, Ye-Seul,Lee, Seung-No 한국농공학회 2015 한국농공학회논문집 Vol.57 No.6
Recently, the Korean government announced a new development plan for a large-scale greenhouse complex in reclaimed lands. Wind environments of reclaimed land are entirely different from those of inland. Many standard books for ventilation design didn't include qualitative standard for natural ventilation. In this study, natural ventilation rates were analyzed to suggest standard for ventilation design of venlo type greenhouse built on reclaimed land. CFD (Computational Fluid Dynamics) simulation models were designed according to the number of spans, wind conditions and vent openings. The wind profile at a reclaimed land was designed using ESDU (Engineering Sciences Data Unit) code. Using the designed CFD simulation model, ventilation rates were computed using mass flow rate and tracer gas decay method. Additionally computed natural ventilation rates were evaluated by comparing with ventilation requirements. As a result of this study, ventilation rates were decreased with increasing of the number of spans. Ventilation rates were linearly increased with increasing of wind speed. When the wind speed was $1.0\;m{\cdot}s^{-1}$, only side vent was open and wind direction was $45^{\circ}$, homogeneity of ventilation rate at 0~1 m height is the worst. Finally, chart for computing natural ventilation rate was suggested. The chart was expected to be used for establishing standard of ventilation design.
전산유체역학을 이용한 표준 오리사 설계안에 대한 환기효율성 분석
여욱현,조예슬,권경석,하태환,박세준,김락우,이상연,이승노,이인복,서일환,Yeo, Uk-Hyeon,Jo, Ye-Seul,Kwon, Kyeong-Seok,Ha, Tae-Hwan,Park, Se-Jun,Kim, Rack-Woo,Lee, Sang-Yeon,Lee, Seung-No,Lee, In-Bok,Seo, Il-Hwan 한국농공학회 2015 한국농공학회논문집 Vol.57 No.5
In Korea, 69.4 % of duck farms had utilized conventional plastic greenhouses. In this facilities, there are difficulties in controlling indoor environments for raising duck. High rearing density in duct farms also made the environmental control difficult resulting in getting more stressed making their immune system weaker. Therefore, a facility is needed to having structurally enough solidity and high efficiency on the environmental control. So, new design plans of duck house have recently been conducted by National Institute of Animal Science in Korea. As a study in advance to establish standard, computational fluid dynamics (CFD) was used to estimate the aerodynamic problems according to the designs by means of overall and regional ventilation efficiencies quantitatively and qualitatively. Tracer gas decay (TGD) method was used to calculate ventilation rate according to the structural characteristics of duck houses including installation of indoor circulation fan. The results showed that natural ventilation rate was averagely 164 % higher than typically designed ventilation rate, 1 AER ($min^{-1}$). Meanwhile, mechanically ventilated duck houses made 81.2 % of summer ventilation rate requirement. Therefore, it is urgent to develop a new duck house considering more structural safety as well as higher efficiency of environmental control.