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      • KCI등재

        고성능 시멘트 그라우트로 충진된 풍력타워 연결부의 정적 및 피로부착특성

        서교,김상현,오홍섭 한국방재학회 2016 한국방재학회논문집 Vol.16 No.6

        In this study, authors developed a high-performance fiber reinforced grout for applying the steel tube connections of offshore supporting structure and then conducted a bond tests for verifying the static and fatigue behavior of the grouted connection. The cement grout is composed with portland type 1 cement, alumina cement, silka fume, and added steel fiber to enhance the strength and toughness of grout and the compressive strength at 28day is at least 130MPa. Experimental variables for bond test are adopted aspect ratio (0.013 and 0.056) of shear key in steel connection, aspect ratio (30 to 67) and volume fraction (0.5, 0.9 and 2.3%) of steel fiber. The specimen with 2.3% fiber volume fraction and 0.056 aspect ratio of shear key has highest bond strength than other specimens and the fatigue life under cyclic loads up to 65% of ultimate strength is more than 1,600,00 cycles. 본 연구에서는 고성능시멘트 그라우트를 개발하여 해상 지지구조물 강재 튜브연결부에 적용하고자 하였으며, 그라우트에 의한 연결부의 정적 및 피로부착거동을 분석하기 위하여 부착실험을 수행하였다. 시멘트 그라우트는 인성과 강도를 높이기 위하여 1종 포틀란트 시멘트와 알루미나 시멘트 및 실리카 흄과 함께 강섬유를 사용하였으며, 130MPa이상의 28일 압축강도를 발현하였다. 부착강도 실험시 실험변수는 연결부 전단키의 형상비, 섬유혼입율과 섬유형상비를 적용하였다. 전단키의 형상은 0.013, 0.056이었으며, 섬유형상비(l/d)는 30~67, 섬유혼입율은 0.5%,0.9%,2.3%를 사용하였다. 실험결과 섬유혼입율 2.3%이상, 전단키 0.056인 경우의 부착강도가 가장 높게 나타났으며, 최대정적강도를 보인 실험변수의 피로수명 역시 응력수준 65%에서 1,600,000회 이상의 수명을 나타내었다.

      • KCI등재

        주성분 분석 및 군집분석을 이용한 지역정보 유형화 프레임워크의 설계와 구현

        서교,김태곤,이지민,이정재,Suh, Kyo,Kim, Tae-Gon,Lee, Ji-Min,Lee, Jeong-Jae 한국농공학회 2012 한국농공학회논문집 Vol.54 No.1

        For planning and developing rural regions, it is very important to understand and utilize regional characteristics including social, demographic, and economic aspects. The purpose of this study is to find effective analysis techniques and provide a procedure design for mining regional characteristics in South Korea through reviewing and analyzing 41 related studies. The engaged research methods can be classified into five categories (PCA+CA, PCA, CA, GIS, and PCA+GIS) with the combination of three methodologies: principal component analysis (PCA), cluster analysis (CA), and geographical information system (GIS). The combination of PCA and CA occupied about 40 % of research methods used in related studies. The analysis tool of Korean Rural Information Supporting System (KRISS) is designed based on the outcomes of this study and applied to classify the regional capacity of agriculture using agricultural census data (2000) for evaluating its applicability.

      • KCI등재

        농촌의 잠재적 가치에 의한 농촌지역개발 평가지표 연구

        서교,이지민,김한중,정남수,조순재,이정재 한국농촌계획학회 2003 농촌계획 Vol.9 No.1

        The purpose of this research was to develop evaluation index of regional development for producing potential values of rural regions besides agriculture on a commercial scale. Rural regions have potential values such as preserved nature and spatial advantages and so on. For regional development, potential values should synthetically evaluated by objective and standard index for supporting decision. For evaluation of plural functions of rural regions, evaluation index rural regions was developed based on rural amenity. Applicability of evaluation index was studied using GIS and natural break method.

      • KCI등재

        탱크모형에 의한 농산물의 출하예측 -마늘을 중심으로-

        서교,이정재,Suh, Kyo,Lee, Jeong-Jae 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2

        While the need for analyzing and interpreting agricultural logistics are becoming more and more prominent with the rapid changes within the agricultural environment, previously mathematical models have been proved to have its limitations due to the unpredictable traits of agriculture itself and finding the adequate simulation model is not easy. Therefore, in this research, the tank model that has been used to analyze the rainfall-runoff in watersheds, was used to develop a logistics model for estimating shipment by agricultural production. The model was certified by wholesale market data of garlic.

      • KCI등재

        팔레트 적재효율을 고려한 농산물 포장상자 통합규격에 관한 연구

        서교,이정재,서병륜,Suh, Kyo,Lee, Jeong-Jae,Suh, Byong-Yoon 한국농공학회 2005 한국농공학회논문집 Vol.47 No.1

        Despite the variety in sizes and shapes of agricultural products, the unified standardization of packing has been a long time necessity. In this study the stacking efficiency of packing standards for each box using packing Monte Carlo simulation based on the standard pallet is evaluated. As a result of simulation the unified packing standard for agricultural products is suggested by 550$\times$366 mm. With this study it is expected that the unification of the standards can help to increase the utilization of reusable packages and to improve efficiency of agricultural logistics.

      • KCI등재

        GASS를 이용한 농산물 유통 시스템 시뮬레이션

        서교,이정재,김태곤,이호재,Suh Kyo,Lee Jeong-Jae,Kim Tae-Gon,Yi Ho-Jae 한국농공학회 2005 한국농공학회논문집 Vol.47 No.4

        The object of this study is to develop simulation model using GASS for analyzing complex agricultural marketing. It's hard to analyze agricultural marketing system which consists of many marketing unit by economic mathematical model. This paper proposes simulation model based on GASS which can reduce complexity of system, and applies the national average wholesale cost and retail cost of alpine Chinese cabbage at 2001, 2002 to proposed simulation model.

      • KCI등재

        基于女性主义视野下的池莉小说日常生活叙事研究

        徐巧 중국인문학회 2022 中國人文科學 Vol.- No.81

        The new era of daily narrative fiction points women to daily life, and there is a close overlap between gender and daily life perspectives, making contemporary women's daily narratives rich and diverse. As one of the pioneers of the "neo-realism" genre in China, Chi Li is good at narrating daily life through the female perspective. This paper analyzes Chi Li's novels under the dual perspective of feminism and daily life, and finds that Chi Li's dual perspective style of feminism and daily life is deeply influenced by Western feminist criticism, but also has her unique narrative style, and the secularization of literary aesthetics is more prominent. Under the feminist perspective, the daily life narratives of Chi Li's novels in the new period are rooted in the transmutation of women's daily life consciousness, the narrative emotions are zero distance from daily life, the narrative language bears a strong Hubei brand, and the content shows more of the true restoration of daily life. She writes from a uniquely feminine perspective to care for women in the present world and constructs a care for life with inner intuition and experience, which is a model of feminist criticism and its local practice and has unique value in literary narrative. 현대의 서사소설은 젠더적 시각과 일상의 시각이 잘 어우러져 현대 여성의 일상서사가 풍부하고 다양하다는 특징을 보인다. 池莉는 중국 신사실주의 창시자 중 한 명으로 여성의 시각으로 일상의 다양함을 잘 묘사해냈다. 페미니즘과 일상생활을 모두 중시하는 池莉의 소설을 분석하면서, 그녀가 서구 페미니즘 비판사상의 영향을 깊이 받았고, 또한 독특한 서사 풍격을 가지고 있어서 문학의 심미적인 세속화 전환이 비교적 뚜렷하게 나타나고 있음을 알 수 있었다. 여성주의 시각으로 보면, 池莉 신시대 소설의 일상생활에 대한 묘사는 여성의 일상생활 의식의 변천에 뿌리를 두고 있어서, 일상생활에서 소재를 찾고 湘방언을 사용하여 湖北省 사람들의 일상생활 진면목을 있는 그대로 드러내고 있다.독특한 시각과 내재적인 직관으로 여성의 심리와 생명성을 그려낸 池莉의 소설은 페미니즘 비판과 문학적인 실천의 전형으로 文學敍事에서 독특한 가치를 지닌다.

      • KCI등재후보
      • KCI등재후보

        농산물의 저장성이 출하량과 가격예측에 미치는 영향 분석

        서교,이정재 한국농촌계획학회 2004 농촌계획 Vol.10 No.3

        In this study the effect caused by limited storage life of agricultural products for determining shipping amount can be analyzed by 1^(st) order autoregressive model based on cobweb theorem. Carrying capacity and auction price of upland-grown cabbage and garlic from 2000 to 2003 in wholesale markets were used for analysis. In result regression models of cabbage can not be used in verification periods although those of garlic approximately predicted shipping amounts in verification periods. It can be inferred that it is hard to control shipping amounts depending on price fluctuation for agricultural products which have limited storage life so cultivated areas and meteorological risk should be managed for stable price.

      • KCI등재후보

        Web 기반의 농산물 유통분석 통합 시스템 개발

        서교,이정재,김태곤 한국농촌계획학회 2005 농촌계획 Vol.11 No.3

        This study is to develop a web-based integrated system for flow of agricultural products based on recent researches with engineering approach. The system stands on the basis of web for accessibility and usability. Three parts of the system consist of analysis of regional shipping characteristics using tank model, estimation of pallet load efficiency with Monte Carlo Simulation, a long term prediction of market price with reliability analysis. Besides a decision support module for selecting optimal shipping market is added through synthesizing techniques and spatial analysis using GIS and applied to Chinese cabbage of Pyeongchang in 2004.

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