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ORYZA2000을 이용한 유기 벼 재배 시스템의 질소 동태 및 벼 생육 모의
신재훈,이상민,옥정훈,남홍식,조정래,안난희,김광수,Shin, Jae-Hoon,Lee, Sang-Min,Ok, Jung-Hun,Nam, Hong-Sik,Cho, Jung-Lai,An, Nan-Hee,Kim, Kwang-Su 한국유기농업학회 2017 韓國有機農業學會誌 Vol.25 No.4
The study was carried out to develop a mathematical model for evaluating the effect of organic fertilizers in organic rice production systems. A function to simulate the nitrogen mineralization process in the paddy soil has been developed and integrated into ORYZA2000 crop growth model. Inorganic nitrogen in the soil was estimated by single exponential models, given temperature and C:N ratio of organic amendments. Data collected from the two-year field experiment were used to evaluate the performance of the model. The revised version of ORYZA2000 provided reasonable estimates of key variables for nitrogen dynamics and crop growth in the organic rice production systems. Coefficient of determination between the measured value and simulated value were 0.6613, 0.8938, and 0.8092, respectively for soil inorganic nitrogen, total dry matter production, and rice yield. This means that the model could be used to quantify nitrogen supplying capacity of organic fertilizers relative to chemical fertilizer. Nitrogen dynamics and rice growth simulated by the model would be useful information to make decision for organic fertilization in organic rice production systems.
신재훈(Jae Hun Shin),이대훈(Dae Hoon Lee),송정은(Jeong Eun Song),조성준(Sung Jun Cho),박찬흠(Chan Hum Park),강길선(Gilson Khang) 한국고분자학회 2017 폴리머 Vol.41 No.1
실크는 천연 생체재료로, 낮은 염증성, 우수한 생체적합성을 가지고 있으며, 다양한 형태로 제조할 수 있다. 본 연구에서는 피부 재생에 있어, 실크 지지체의 효과를 확인하고자 in vitro와 in vivo 환경에서 실험을 진행하였다. 실크 지지체는 1, 2 및 3%의 스펀지 형태로 동결건조하여 제조하였고, 실크 지지체의 특성을 위해 SEM, FTIR 분석을 실시하였다. 세포 부착 및 증식률은 MTT 분석, 염증반응은 RT-PCR을 통해 확인하였다. 또한 피부재생 효과는 전층 결손을 유발시킨 마우스 모델에 실크 지지체를 이식한 뒤 적출하여, 조직학적 평가를 통해 확인하였다. 그 결과, 상처 치료에 있어, 실크 지지체의 응용 가능성을 확인하였다. Silk is a well-studied biomaterial, possessing low immunity, high biocompatibility, and easy fabrication into various forms for several clinical applications. Herein, we have performed an in vitro (NIH/3T3 cells) and in vivo (rat models) study on silk sponges’ efficacy for skin regulation. The silk sponges were fabricated with 1, 2 and 3% silk contents via freeze-drying. All the samples physical characteristics were examined by FESEM and FTIR. In vitro biological properties including cell adhesion, proliferation and inflammation were confirmed by MTT assay and RT-PCR. Furthermore, the skin regeneration efficiency was examined by histological assessment, where the silk sponges were implanted at full thickness skin wounds in rat models. Considering all the obtained results, the silk sponges can be envisioned as a potential biomaterial for wound healing applications.
공랭식 열교환핀이 부착된 열전모듈의 냉각 성능에 관한 연구
신재훈(Jae-Hoon Shin),한훈식(Hun Sik Han),김윤호(Yun Ho Kim),김서영(Seo Young Kim),현재민(Jae Min Hyun) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.3
Thermal performance of louver fin and plate fin in a thermoelectric cooling system with a duct-flow type fan arrangement is analytically evaluated. The thermoelectric cooling system consists of a thermoelectric module and two heat exchanger fins. The analytic results show that the optimized louver fin has lower thermal resistance than plate fin. The COP and heat absorbed rate of the thermoelectric cooling system with optimized louver fins are 10.3% and 5.8% higher than optimized plate fins, respectively.
신재훈(Jae Hoon Shin),한훈식(Hun Sik Han),김윤호(Yun Ho Kim),김서영(Seo Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The thermal performance of a thermoelectric module in a thermoelectric cooling system with a heat sink is analytically and experimentally examined. The thermoelectric cooling system is composed of a thermoelectric module and two heat sinks. The thermal performance of a thermoelectric module (Seepel, Crystal) is analytically taken into account. The results show that COP (coefficient of performance) of a thermoelectric module is reduced and the heat absorbed increases as the input voltage increases. The thermoelectric cooling system with 12V provides 73.3% lower COP and 46.7% higher heat absorbed compared to 5V, experimentally. The theoretical predicted result is in good agreement with the measured data.
게임 프로그램 이해를 통한 체계적 "프로그래밍" 교수 자료 개발
김종훈,신재훈,Kim, Jong-Hoon,Shin, Jae-Hun 한국정보교육학회 2001 정보교육학회논문지 Vol.5 No.1
'컴퓨터 교육'이라는 개념은 컴퓨터를 이용한 교육과 컴퓨터를 배우는 교육 두 가지 의미를 동시에 가지고 있기 때문에 사용하는데 주의를 기울여야 한다. 후자의 개념으로서 '컴퓨터 교육'은 전산학에 대한 개론 및 프로그래밍과 관련된 학습이 핵심을 이룬다. 특히 프로그래밍의 학습의 경우는 코딩, 컴파일링, 디버깅등의 복잡한 과정과 함께 운영체제 및 하드웨어에 대한 지식 같은 프로그래밍 외적인 분야에 대해서도 다양한 이해가 요구된다. 기존의 프로그래밍 학습은 프로그래밍 언어의 문법에 대한 기계적 암기나 사용법을 익히는 것에 치중하여 논리적인 사고를 키우는데 적합하지 못했다. 이에 본 논문에서는 프로그래밍에 대한 기본적인 통찰력을 기를 수 있도록 프로그래밍 언어의 기초가 되는 C로 코딩된 게임 소스들을 분석하고자 한다.
오리발 유래 콜라겐과 탈미네랄화된 골분 스펀지에서 골 분화능력평가
차재근(Jae Geun Cha),차세롬(Se Rom Cha),이대훈(Dae Hoon Lee),신재훈(Jae Hun Shin),송정은(Jeong Eun Song),서동삼(Dong Sam Suh),박찬흠(Chan Hum Park),강길선(Gilson Khang) 한국고분자학회 2016 폴리머 Vol.40 No.6
본 연구에서는 오리발 콜라겐(duck’s feet derived collagen, DC)과 탈미네랄화된 골분(demineralized bone particles, DBP)을 3:1, 1:1, 1:3 비율로 혼합하여 스펀지를 제조하였다. 제조한 스펀지의 특성분석을 위해 압축강도, 다공성, SEM 등을 측정하였으며, 골수 유래 줄기세포(BMSC)를 비율별 DC/DBP 스펀지에 파종하여, 세포 부착, 증식 및 골 분화를 확인하고자, SEM, MTT, ALP, RT-PCR 및 조직학적 염색을 통한 분석을 실시하였다. 그 결과, 1:1 DC/DBP 스펀지에서 골 분화 효과가 우수한 것을 확인하였으며, 이를 골 재생을 위한 생체재료로 활용할 수 있을 것으로 기대된다. In this study, duck"s feet derived collagen (DC) and demineralized bone particles (DBP) sponges were prepared by mixing both the components on the ratio of 3:1, 1:1, and 1:3. The physio-chemical properties of the sponges were examined by measuring compressive strength, porosity, SEM, etc. In vitro biological characterizations such as cell attachment, proliferation and osteogenic differentiation of the as-prepared sponges were studied by inoculating the bone marrow-derived stem cells (BMSC) in ratio-specific DC/DBP sponges followed by SEM, MTT, ALP, RT-PCR & histological analysis by staining. We found that the 1:1 DC/DBP sponges displayed superior osteogenesis, thus can be envisioned as a potential, biomaterial for regeneration of bone.
증산제를 통한 혐기소화율 개선 및 슬러지 감량 활용방안
이광헌(Kawng Hun Lee),김길수(Gil Su Kim),손병권(Beong Keon Sun),최찬섭(Chan Sup Choi),조진우(Gin Woo Cho),신재훈(Jae Hoon Shin),정태영(Tae Young Jeong) 유기성자원학회 2018 유기물자원화 Vol.26 No.3
본 연구는 음식물폐기물로부터 얻어진 증산제 용액을 농축슬러지와 함께 혐기소화조의 투입한 결과 혐기소화율 향상 및 슬러지 감량화를 살펴보았다. 혐기소화조에 증산제를 5%정도 농축슬러지와 함께 투입한 소화조의 메탄생성율이 약 2.7배 정도 높게 발생하였으며, 소화조내 TCOD 농도값이 약 2배 이상 높게 나타난 것은 투입된 농축슬러지의 감량화가 빠르게 진행됨을 알 수 있었다. 또한, 투입된 증산제로 인해 메탄생성효율에 크게 기여함을 간접적으로 알 수 있었다. This study examined the improvement of anaerobic digestion rate and sludge reduction as a result of the addition of anaerobic digestion with thickened sludge and solution of VFAs obtained from food waste. The methane production rate of the digestion system was 2.21 times higher when anaerobic digestion reactor injected into anaerobes with VFAs from food wastes of 5 percent. Also, The reduction of the amount of concentrated sludge injected will proceed rapidly because of the TCOD concentration in the digestion reactor was more than twice higher. Indirectly it was shown that the increased production system contributed significantly to the methane production efficiency.
소형 라이시미터를 활용한 유기자재에 따른 유기농 논물에서의 무기태질소 동태
옥정훈 ( Jung-hun Ok ),신재훈 ( Jae-hoon Shin ),조정래 ( Jung-lai Cho ),안난희 ( Nan-hee An ),남홍식 ( Hong-shik Nam ),정지희 ( Ji-hee Jeong ),정정아 ( Jung-ah Jung ),김석철 ( Seok-chol Kim ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
Behavior of inorganic nitrogen in organic paddy field water depending on organic nutrient sources was monitored using mini-lysimeters. The mini-lysimeters were placed in National institute of Agricultural Sciences (NAS). 36 undisturbed paddy field soil samples of 30 × 80 cm (diameter × height) was collected by special sampler and installed in mini-lysimeters. After stabilization of lysimeters, several input treatments of organic nutrient sources were applied, including compost, expeller cake and green manures of hairy vetch and rye. Each nutrient source as recommended by the standard amount of fertilizer for rice was supplied 2 weeks before rice transplanting. The water level was maintained 10 cm water depth, and water samples were collected periodically. The pH, specific electrical conductance (EC), and inorganic nitrogen concentration in paddy water was monitored during the experimental period. The average pH value in paddy water was ranged from 7.1 to 7.7. The average EC value in paddy water were ranged from 0.25 to 0.97, and showed to appear higher tend rye > compost > hairy vetch > expeller cake > chemical fertilizers > control. The change of inorganic nitrogen concentration in paddy water is shown in figure 1. The inorganic nitrogen concentrations quickly reached their highest within 26 days after organic nutrient application and decreased afterwards. The inorganic nitrogen concentration for expeller cake and green manure treatments were higher as compared to that for compost and chemical fertilizers treatments. The increasing and decreasing of inorganic nitrogen concentration showed different trends according to the processing of organic nutrient sources.