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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
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구조용(構造用) 연강재(軟鋼材)에 대한 피로경화(疲勞硬化)의 영향(影響)에 관한 연구(硏究)
장동일,용환선,황윤국,Chang, Dong Il,Yong, Hwan Sun,Hwang, Yoon Koog 대한토목학회 1982 대한토목학회논문집 Vol.2 No.4
강구조물(鋼構造物)의 안전유지(安全維持) 및 보수보강(補修補强)에 필요한 자료(資料)를 얻기 위해, 공용이역(供用履歷)을 갖는 강재(鋼材)와 갖지 않는 강재(鋼材)의 기계적(機械的) 성능(性能) 및 인성변화(靭性變化)를 실험적(實驗的) 방법(方法)을 통(通)해 비교검토 하였다. 본(本) 연구(硏究)에서는, 공용중(供用中)에 받은 피로누적(疲勞累積)에 의한 경화(硬化) 및 취화인성저하(脆化靭性低下)등을 검토하였으며, 파악된 사항이 강구조물(鋼構造物) 연결방법(連結方法)에 사용되고 있는 용접(鎔接)에 미치는 영향을 고찰하였다. 그 결과(結果), 경화(硬化) 및 취화(脆化)의 영향은 강도증가(强度增加) 보다 인성저하(靭性低下)에 더 많은 작용을 하였으며, 강구조물(鋼構造物) 연결방법(連結方法)으로 채택한 용접(鎔接)에서도 같은 경향을 보였다. 또한 공용이역(供用履歷)을 갖는 강재(鋼材)와 갖지 않는 강재(鋼材)를 용접(鎔接)하였을 경우에는 상온(常溫)에서도 취성(脆性)을 나타내고 있음을 알 수 있었다. In order to obtain the necessary data for the safety maintenance, repair, and reinforcement of steel structures, experiment was carried out to examine the mechanical capacity and toughness variation for steel with service history and without. In this paper, hardening and embrittlement by fatigue accumulation, and the decrease of toughness was examined and weld that was commonly used as the connection method of steel structure was also examined. It was found that hardening and embrittlement have more effect on the decrease of toughness than the increase of strength. Such a tendency was also similary state in case of weld. And it was found that, in the weld of steel with service history and without, embrittlement was observed at normal temperature.
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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.
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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.
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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.
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