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張東日,金基鐵 충남대학교 새마을연구소 1985 새마음 논문집 Vol.6 No.-
This study was a basic research for developing a computer program which could be used for designing the optimum systems of diversified farming by region. The objective of study was to model the diversified farming systems including the regional characteristics and applicable to the central regions of Korea. For this purpose, the three villages of plain, hilly and mountainous region were selected, and farming survey and systems analysis were conducted for mainly 1984 agriculture. Surveys were carried out on January and July 1985 for the following villages: 1) Plain regionJungjungRi, BuyeorEup, Buyeor Contry, Chungnam Province 2) Hilly regionBonggiRi, KumnamMyon, Yunki Country, CHungnam Province 3) Mountainous regionSungsanRi, OhchangMyon, Chungwon Country, Chungbuk Province The surveyed data were analyzed by systems analysis. Then, the diversified farming systems were modeled for three areas not only with the analyzed results, but also with the modeling objectives, the crop selection criteria and assumptions. They consist of cropping systems and farm machinery system. The former includes four cropping patterns for paddy, six cropping patterns for upland, two kinds of fruit crop and three kinds of livestock. The latter comprises seven farm machinery for each work system. The basic cropping systems was “Rice(Barley) + Special crop + Supplementary crop”. The special crops were selected by the nature of the optimum cultivating conditions and the supplementarys were choosed and combined with the specials to increase their mutual benefits. The introducing priority of the selected crops was decided by their profitability and the cropping patterns were modeled by the combination methods emphasizing the maximum utilization of agricultural resources. Agricultural machinery system was modeled that the major machinery was included for each work system as follows: 1) Plowing and harrowing Power tiller 2) Transplanting Power transplanter 3) Pest control Power sprayer 4) Irrigation and drainage Water pump 5) Harvesting Binder 6) Threshing Power thresher 7) Drying Continous dryer
장동일,이희현,전진창 한국전산구조공학회 1992 전산구조공학 Vol.5 No.3
본 연구에서는 트럭하중에 의한 도로형교의 진동거동을 조사하여 충격계수를 합리적으로 산출하는 경험공식을 제시한다. 이를 위해 진동해석을 위한 가장 합리적인 차량 모델링을 제시하고, 노면조도, 차량의 속도, 교량의 길이별 충격계수를 산출한다. 연구결과, 현행 시방서규정은 충격계수를 과소평가하는 경향이 있음을 알 수 있었다. Vibrational behaviors of highway girder bridges due to heavy traffics are discussed, and empirical formulae for impact factors are suggested in this paper. Appropriate vehicle model for vibration analysis is found and impact factors are calculated with different surface roughnesses, vehicle speeds and span lengths. It is shown that the present codes tend to underestimate impact factors.
장동일,이희현 한국전산구조공학회 1992 전산구조공학 Vol.5 No.2
본 연구에서는 트럭하중에 의한 도로형교의 진동거동을 조사하여 충격계수를 합리적으로 산출하는 경험공식을 제시한다. 이를 위해 진동해석을 위한 가장 합리적인 차량 모델링을 제시하고, 노면조도, 차량의 속도, 교량의 길이별 충격계수를 산출한다. 연구결과, 현행 시방서규정은 충격계수를 과소평가하는 경향이 있음을 알 수 있었다. Vibrational behaviors of highway girder bridges due to heavy traffics are discussed, and empirical formulae for impact factors are suggested in this paper. Appropriate vehicle model for vibration analysis is found and impact factors are calculated with different surface roughnesses, vehicle speeds and span lengths. It is shown that the present codes tend to underestimate impact factors.
용접강교량(鎔接鋼橋梁) 부재(部材)의 충격(衝擊) 및 피로파괴거동(疲勞破壞擧動)에 관한 연구(硏究)
장동일,민창동,용환선,Chang, Dong Il,Min, Chang Dong,Yong, Hwan Sun 대한토목학회 1985 대한토목학회논문집 Vol.5 No.4
국내강교량(國內鋼橋梁)에서 사용(使用)되는 대표적인 강종(鋼種)인 SWS50에 대한 파괴거동(破壞擧動)의 거시적(巨視的)인 고찰(考察)을 통하여 충격파괴거동(衝擊破壞擧動)과 피로거동(疲勞擧動)을 조사(調査)하여 미시적(微視的)인 고찰(考察)과의 관계(關孫)를 추적하는데 필요(必要)한 기초자료(基礎資料)의 제시와 국내(國內) 생산(生?)시판 강종(鋼種)에 대한 파괴제어(破壞制御)의 자료(資料)를 제공한다. In this study, impact fracture and Fatigue behaviors of SWS50 steel are investigated in terms of macroscopic view. Then the fundamental data needed to trace the relationship between macroscopic and microscopic views and the data for fracture control of steels manufactured in domestic are represented.
인장부재(引張部材)에 뚫은 Stop-hole 이 피로균열성장율(疲勞龜裂成長率)에 미치는 영향(影響)에 관한 연구(?究)
장동일,정경섭,Chang, Dong Il,Jung, Kyoung Sup 대한토목학회 1987 대한토목학회논문집 Vol.7 No.4
본 연구는 피로균열이 발생한 부재의 응급적인 보수, 보강방법으로 예로부터 실제로 이용되어 온 stop-hole에 대하여 그 보수, 보강효과를 잔존수명의 관점에서 정량적인 평가를 시도한 것이다. 이를 위하여 대상 시험편에 대한 피로시험을 실시하여 그 피로거동을 검토한 결과, 피로균열에 대한 응급조치로서 stop-hole을 이용할 경우, 균열이 탄소성 거동을 하는 영역에 이르기 전에 처리하는 것이 바람직함을 알 수 있었다. Stop-hole method is one of the conventional methods for the temporary repair or reinforcement of the member in the case that the structural steel member has a fatigue crack. In this study, the stop-hole method. have been estimated quantitatively in terms of survival life time of the side edge cracked specimen. For this purpose, fatigue tests have been performed on the test specimens and the fatigue crack growth rates of the structural steel (SS41) members have been measured under load of constant amplitude. The results of this experiment show that it is desirable to use the stop-hole method before the crack reaches the region of elasto-plastic behaviour.