位體 벼대의 圖解法

吳在華 陸軍士官學校 1976 한국군사학논집 Vol.16 No.-

In order to obtain technical solutions for engineering problems, algebraic method is generally used; however, there are cases in which graphical method is preferred for the solutions of some simple problems. In this paper, two methods of solutions are compared through the analysis of cubic structure by drawing three dimensional vector diagram based on the principles of orthographic projection.

광주광역시 도시공간구조 변화에 관한 연구

오재화,김우혁,김현웅 朝鮮大學校 建設技術硏究所 2002 建設技術硏究 Vol.22 No.1

The purpose of this thesis is to inspect the step of spatial structure varied with the urban growth in place of Kwang-ju, to analyze the developing step of urban growth on the basis of the variety of shape-index and function-index on urban from 1930 to 1992 each year, to predict the variety direction of urban spatial structure for the concentrating and efficient urban function and to grope for the prospects of urban : what is the municipal concept in the land use, the variety of population, the change of traffic system, the change of urban planning zone, the change of executive zone, the transition of spatial structure on the basis of urban growth in Kwangiu. Considering the advent of subway in 1990, Pyoung-Dong industrial block, to work out these factors, the urban pattern in Kwangiu would be developed and established in aspect of long-range planning. The size of population, the changing pattern of land use planning and zonning are compared and analyzed to justify the relation with the urban comprehensive planning circulation planning.

안전관리와 안전사고 모형에 관한 연구

오재화,박영길,김문채 朝鮮大學校 建設技術硏究所 2002 建設技術硏究 Vol.22 No.1

Bigger in the size, more diverse in the style, recently, the interest and necessity of effective safety consciousness during construction has been increased in the construction field. Through the literature reviews and questionnaire survey, this study proposes a realities of the effective safety consciousness in the construction field. The cause of safety supervision which influence safety prevention are diverse, among them, especially, the safety consciousness have great impact on the safety accident. According to, safety accidents can be protected through safety education and safety awareness of each employee. Ultimately, prevention and recognition against safety accident are changed depending on employed category of construction field, it is necessary to educate and confidence considering each employed category of construction work for safety supervision rather than to uniform education about safety consciousness.

Lade 구성모델을 사용한 점토의 변형예측

吳在和 조선대학교 국토개발연구소 1993 국토개발연구 Vol.13 No.1

This study has dealt with the determination of soil parameters for Lade's double work-hardening model using the raw data obtained from cubical and cylinderical triaxial. At present, it should be investigated which test can simulate satisfactorily the behavior of soft clayey foundation. In this regard, plate bearing test was performed on the 2-dimentional model foundation(218 cm long, 40 cm wide, 196 cm high), and finite element analysis carred out for the behavior of the foundation. Settlement, lateral displecement, displacement vector and mode of failure were measured and these values were compared with numerical values in order to validate the numerical program developed by authors. Besides, stresses including vertical, horizontal and shear stress as well as pore water pressure within the model foundation were simulated by numerical analysis. The FEM technique was based on Christain-Boehmer's method, in which the displacement is obtained at each nodal point while stress and pore water pressure at each element. In this research, Bilt's consolidation, which expressess elaborately the physical meaning of consolidation, was selected, as governing equation, coupled with Lade's double surface work-hardening constitutive model.

현장 조사에 준설점토의 수축특성

오재화,이광찬 대한토목학회 2002 대한토목학회논문집 C Vol.22 No.6

土地의 適性評價 實態와 改善方案에 관한 考察

오재화,박영길,박한생 朝鮮大學校 建設技術硏究所 2005 建設技術硏究 Vol.25 No.1

The Land Suitability Assessment System is a newly introduced system that provides criteria for land use classification. It is introduced by the 「Act on Planning and Utilization of the National Territory」 in order to prevent unplanned development of the nation. It classifies land use types into 5 grades according to soil, location, and usability of the land. Most of the land assessed as first and second grade, tend to be planned as conservation area, while the land assessed as fourth and fifth planned as development area. This study aims at analyzing problems in applying the Land Suitability Assessment System into practice, seeking solutions for the expected problems, and suggesting the ways of improving assesment methods. This study examines possible problems in implementing the Land Suitability Assessment System and suggests proper solutions for successful performance of the system. It will be a useful reference for local municipalities to carry out the system. And suggests solutions for The Land Suitability Assessment System. The solutions for the Assessment System are suggested as follows: enhancing the status of Assessment System by revising its institutional system, strengthening linkage between Assessment System and planning system, establishing basic DB for the whole undeveloped land, improving assessment standards, facilitate training program for relevant government officers, etc.

통행분포기법의 적용과 평가에 관한 연구

오재화,황의진,진용선 朝鮮大學校 建設技術硏究所 2001 建設技術硏究 Vol.21 No.1

This study has an object of searching for appropriateness in applying the trip distribution model by studying the changes of the character of parameter which the model contains and by analyzing and evaluating trip distribution technique out of four steps of pre-estimate technique for the traffic demand through computer simulation centering around Kwangju. Method of this study is investigating the basic theory for trip distribution model and with this grounding, I rearranged it as research data for trip distribution model compatible for Kwangju, using data such as research data on actual state, the statistics annual report and basic plan for traffic full equipment of Kwangju. So, The most stable measure of the type of trip distribution of Kwangju city was produced in Fratar and Detroit model, however, gravity model has a little bit low reliance in sharing of estimation and actual survey although it is astringent in short period.

流動化 Concrete 施工性 改善에 關한 考察

吳在和 조선대학교 국토개발연구소 1991 국토개발연구 Vol.11 No.1

This paper aims at the characteristis investigate of flowing concrete at laboratoty tests, especially associated with the workability, However the flowing concrete, with is increasingly used throughout this country is made by adding some flowing admixtures to the base concrete for the purpose of the improvement of workability in construction works. The main conclusions are summarized as follows: 1. The factors affecting flowing are the quantity of admixture, mixing time and temperature in curing. 2. The separation can be prevented by increase of 3∼5% in fine aggregate. 3. The unit water can be reduced by 8∼12% as compared to the base concrete 4. Slump is decreasing with the elapse of time and finally is equal to base concrete after 50∼60 minutes. 5. Special control should be taken daring mixing for high quality flowing concrete.

레미콘 品質管理에 관한 考察

吳在和 조선대학교 국토개발연구소 1989 국토개발연구 Vol.9 No.1

Recently qualitative improvement of ready mixed concrete is urgently needed as the demand of civil and architectural structures sharply increase home and abroad. However the betterment of ready mixed concrete has been hindered because of shortage of concrete engineers and technology and the dependance in conventional method from design to management. This study aim at taking good qualitative ready mixed concrete with the match design by computer system in manufacturing process of concrete. Getting the required workability, the improvement in quality control of ready mixed concrete is scrutinized bu analyzing transportation and cycle time. The summarized results are as follows; 1. Standard mixing time (35∼50) should be strictly observed. 2. The quality of ready mixed concrete is little influenced mixing 10∼15% supplemently use of stone. 3. In case of delay in transportation time, flow agent should be used not to reduce slump values and air contents.

도시규모별 생활환경에 따른 삶의 질에 관한 연구

오재화,문수회,박종민 朝鮮大學校 建設技術硏究所 2005 建設技術硏究 Vol.25 No.1

The primary purpose of the present study is five-fold : ① to review the concept of quality of life and to propose a set of key components and indices of QOL(Quality of Life) in cities, ② to analyze the level of QOL and the discrepancies among cities, ③ to explore the relation ship between the size of the city and the level of QOL, ④ to compare the level of QOL among OECD member counties, ⑤ and to discuss policy issues and directions to improve the QOL in cities. The study divides QOL into physical and non-physical types. Physical QOL is composed of three components: economic aspect, convenience, and locational attributes. Non-physical QOL includes two components of education and culture, health and safety. Under these key component groups, 35 indices were selected to analyze the level of QOL in cities. It was found that between 1997 and 2002, there was no statistically significant improvement of the level of QOL in general and that the gap among cities was not reduced. Finally, the study suggested several macro level policy issues to improve QOL in cities. There is a need to establish the evaluation system of local administration of the performance to improve QOL. It is necessary to develop new comprehensive indices especially for subjective element and non-physical type of QOL and to accumulate internationally compatible database through collaborative research and exchange programs. The role of civil society, private sector should be articulated and micro-level coordinating measures and organizations chancing quality of life should be instituted to better function what has been traditionally performed by the central government.