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RISS 인기검색어
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- 저자 : 延基錫 (검색결과 48 건)
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橋脚의 크기에서 接近角度와 開度比에 따른 局部洗掘深의 實驗的 硏究
延基錫,金雄鎔 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1
It is necessary to consider the effect of pier skewness and openning ratio when depth of local scour at bridge piers are predicted. It have been known that the depth f local scour at bridge piers and various pier sizes and closed related with the projected width. In this paper, the pier types constructedin the rivers and large stresms in Korea are are investigated based on the shapes. The local scour at Piers with semicircular shape and same openning ratio piers are analyzed based on the experimental studies. The experiments are continued varying the flow depth, the channel bed slope and the angle of attack.
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윤영호,김종섭,연기석 大田産業大學校 1997 한밭대학교 논문집 Vol.14 No.1
Over the past 30years, numerous studies have been conducted and equations developed to Predict bridge-pier scour. Most of these equations were developed using laboratory data and sometimes tested using limited field data. For a number of the equations, the conditions under which the laboratory experiments were conducted are unknown. In addition, the ranges of the various parameters over which the equations are valid are also typically unknown. Even if the range of data used in the laboratory study is known, it is quite uncertain as to flow those ranges, using small-scale models, correlate to prototype conditions. The purpose of this study is to compare seven bridge-pier-scour equations using field data. Data for live-bed scour will be examined; most floods the stream bed is live, there are cases. The limitaions of each of the equations will be examined for the purpose of providing guidance to hydraulic engineers concerned with scour at bridge piers.
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연기석 한밭대학교 산업과학기술연구소 1994 논문집 Vol.2 No.-
This study focused on the systematic analysis of hzard types in Korea and their periodical and regional characteristics. The result of the damage analysis in recent 10 years('82-'91) have shown that : - it is necessary and urgent for inundated urban areas to develop a damage estimation model. - most casualties in Korea occur form mid-July to early September and arised mainly due to heavy rain and typhoon strikes, - small structures and private sector are vulnerable at most in Korea and their damages will be increased continuously in the futures, - 33 countries of the total 136 countries in Korea are most vulnerable and are heavily affected once on every two years.
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연기석,김웅용 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1
The temporal development of local scour depth at cylindrical bridge piers is considered. The experimental data are presented and used to quantify the influence of flow duration on the depth of local scour. The equilibrium scour depth( d_se) are subjected to similar influences of flow and times, as might he expected because they are inherently interdependent. This study is limited to local scouring at cylindrical bridge piers in uniform sand beds. The following conclusions are drawn from this study: 1. The equilibrium depth of scour at a bridge pier under clear-water conditions is approached asymptotically as shwon in Fig. 3. and Fig. 4. 2. The proposed relationship is d_se=EXP(0.961n(t_e)-1.9305) and determinant coefficient is 0.898 in this study.
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延基錫,崔榮洛 한밭대학교 2003 한밭대학교 논문집 Vol.20 No.-
Using the control point structured for land surveying project in 1910s, this study is focused on comparatively analyzing the survey results, which have been gained with appointing 3 cadastral triangulation points and 3 subsidiary cadastral triangulation points laid under the ground of southwest Daejeon Metropolitan City, and the results surveyed using GPS to examine rapidity and economical efficiency. In this way, it can improve precision of the survey results. Results of this study are as follows. 1. Comparatively analyzing the results of existing cadastral survey method by the total station and ones of real-time mobile positioning method, errors have occurred at X axis amounting to average Δx=±0.009m and Y axis to Δy=±0.027m. More precise than the marginal connection error of survey results and examination results amounting to 0.25m, it has turned out to be proper for applying to readjustment of the city streets and control point survey for large unit treatment to contribute to improvement of precision. 2. Comparatively analyzing the results of existing cadastral survey method by the total station and ones of real-time mobile positioning method, errors have occurred at X axis amounting to average Δx=±0.134m and Y axis to Δy=±0.113m. More precise than the marginal connection error of survey results and examination results amounting to 0.25m, it has turned out to be proper for installing subsidiary cadastral triangulation points.
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延基錫 大田工業專門大學 1983 論文集 Vol.32 No.-
To assume an a flood volume tocvard the unexploited districts along nature rivers is very momentous from the stand poit of the puropose for Inundation control. Dae to clatum line of all kinds of facilities, it is necessary to research Inundation volume and a model assuming it there fore in this resarch, to analyse rainfall materials with frequency, and to measure it every spell of inundation correlating these researchs with a common factor of earch and climate, it is also nacessary to exploit a model of frequent inundation volume along the already-exploited of nature rivers.
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이종형,연기석 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.2
The most recent lack is adequate water divide system. It is dynamic programing method and linear programing method have to optimal solution of pipe diameter for design and planning of pipe line. The attempt to framing the arrangement of optimal pipe diameter of pipe line using dynamic programing by personal computer. The possible to pipe diameter arrangement from input of basic data and control to pipe line design using dynamic programing.
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김웅용,윤영호,연기석 大田産業大學校 1997 한밭대학교 논문집 Vol.14 No.1
This paper aims at the elucidation of the characteristics of longshore current profile after wave breaking. Wave breakers are always accompanied by complex turbulent process, wave energy losses and the mean water level variations due to the gradient of radiation stress. These processes with other factor result in the development of longshore currents. Because longshore current have relation to the alongshore sand transport on a bed and, to the diffusion of contaminants nearshore region, the understanding and elucidation of longshore currents are very important from tile engineering point of view. The longshore currents induced by simple wave striking an planar beach, nonplanar beach, and barred beach are calculated.
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