동적계획법에 의한 우수관망 최적설계에 관한 연구

장석환 대진대학교 1998 大眞論叢 Vol.6 No.-

This study aims at developing simulation model of optimal design condition of urban storm sewer system. Urban Storm Sewer System Optimal Design Model(USSOD) can compute the pipe capacity, pipe slope, crown elevation, excavation depth, risk and return cost. Rational formula is used for design discharge, Manning's formula for pipe capacity. Dynamic programming(DP) technique is used for optimization and first order second moment approximation method is used for uncertainty analysis. Layout design model and optimization model including detention effect in urban sewer system needs in further study. USSOD is applied to hypothetical drainage basin to test the sensitivity and it proved the more optimal simulation model to a degree, which verifies that USSOD results are more optimal than usual design.

DDDP 방법에 의한 우수관망 설계의 최적화 연구

장석환 대진대학교 건설연구소 1999 건설공학논문집 Vol.2 No.-

This study aims at developing simulation model of optimal design condition of urban storm sewer system. Urban Storm Sewer System Optimal Design Model(USSOD) can compute the pipe capacity, pipe slope, crown elevation, excavation depth, rick and return cost Rational formula is used for design discharge, Manning's formula for pipe capacity. Discrete Differential Dynamic Programming(DDDP) technique is used for optimization and first order second moment approximation method is used for uncertainty analysis. USSOD has two kinds ; USSOD-1 is to be not considered in calculating design peak flood, and USSOD-2 is to consider detention effect. After comparing the two, it is concluded that USSOD-2 is more rational and closer to the results. USSOD is applied to hypothetical drainage basin to test the sensitivity and it proved the more optimal simulation model to a degree, which verifies that USSOD results are more optimal than usual design.

교량의 영향에 대한 2차원 흐름해석

장석환,기원채 대진대학교 2002 大眞論叢 Vol.10 No.-

Recently, the numbers of the highway bridges have gradually been constructed across the river to cover the volume of traffic rising day by day. Moreover, a localized torrential downpour frequently happens owing to the climatic characteristic of our country that a rainfall is concentrated during the rainy season and the abnormal weather condition. There are many the causes on the flood disasters, one of which is caused by an effect of hydraulic structures like the piers of a highway bridge crossing the river section. It is therefore very important to estimate and analyze the fluctuation of the water surface elevation caused by the hydraulic structures to be built in the river. But the technical analyses about the hydraulic effects caused by the hydraulic structures in the river depend on one-dimensional flow analysis so far and it is also difficult to analyze the hydraulic effects like the water level precisely without two-dimensional flow analysis because of interaction between cross sections successively changed by the hydraulic structures. In this study, the two methods are compared by applying Jangam highway bridge which would be built over Jungnangcheon River to estimate the hydraulic effects, and examine the accuracy. As a result, it is concluded that 2-D analysis output is more accurate and reasonable than 1-D flow analysis.

도시하천 경관설계의 기초

장석환 대진대학교 건설연구소 2000 건설공학논문집 Vol.3 No.-

최근 들어 우리 나라에서 자연형 하천의 설계 및 시공이 활발해져 가고 있는 추세이지만 토목, 조경, 생태의 여러 분야의 전문가들이 각자의 제 목소리를 내고 있는 실정이다. 그러나 하천정비는 이수 치수를 포함한 본래의 하천기능에 충실한 하천환경 및 정비가 이루어져야 하고 그 바탕 위에 경관과 친수성의 향상을 꾀하여 균형을 이루도록 노력해야 한다. 이에 본 연구에서는 지금까지의 하도 계획에서 벗어나 보다 근접한 하천 환경의 실제적인 하천경관 설계에 대한 개념의 정립, 용어의 정리 그리고 설계의 기본 방향에 대하여 하천경관 기초의 일부를 소개하고자 한다. 하천경관 기본설계의 자료가 미비하여 대부분 일본, 미국, 독일 등의 자료를 인용, 발췌하여 우리 나라 실정에 맞게 정리 하고자 하였으며 하천경관 중에서도 개념과 기능적인 부분에 초점을 맞추었으며 그 밖의 요소들은 추후 연구가 진행될 것이다.

댐 수리모형 실험에 따른 원류부의 홍수능과 유량계수의 검토

장석환 대진대학교 건설연구소 1998 건설공학논문집 Vol.1 No.-

To design the hydraulic structure including multipurpose dam, design flood would be simulated by estimating discharge coefficient. But in fact simulation parameter contains various uncertainties, which sometimes and psuggest the accurate design data which cannot bo found in basic design. In this study, overflow discharge capacity thought weir and discharge coefficient applied to Tamjin Dam design and the results give accurate and rational design to engineer. To design more specific condition to hydraulic structure, hydraulic model test should be done before field design.

GIS를 이용한 한탄강 유역의 홍수량 산정

장석환,구본웅 대진대학교 2004 大眞論叢 Vol.11 No.-

The purpose of this study is to analyze and calculate the peak discharge and flood distribution in the basin of Hantan River according to heavy rainfall of August, 1999 which caused Youncheon Dam failure. HEC-HMS simulation model was used to calculate precipitation-runoff relation and discharge based on GIS tool in this study. 30 sub basin was divided to calculate the peak discharge which were applied for 5 rainfall station including Yeoncheon rainfall station and the simulation results were verified into observed data. The result of the simulation is that the peak discharge was forecasted to 10,099m³/sec at the junction of YoungPyung River in 03:50, 31st August and to 13,508m¹/sec at the junction of Imjin River in 04:20, 31st August, 1999.

평림댐 여수로 특성의 실험적 연구

장석환 대진대학교 1999 大眞論叢 Vol.7 No.-

Hydraulic model test is to verify the numerical design results and offer the hydraulic stability components. This study is to overview the spillway for Pyung Lim dam design items ; discharge capacity of weir, the relationship between stage and discharge coefficients, cavitation stability of spillway structure, hydraulic phenomena of chuteway and energy dissipator by stilling basin. The model scale is 1/30 and 50year, 10year, 200year, PMF, flood were tested. It resulted that underestimated discharge coefficient in reservoir and short of energy dissipator should be improved.

기초과학분야에서의 통계학의 이용

장석환 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1

QUAL2EU모형에 의한 탐진강 수계 수질모의

장석환 대진대학교 2000 大眞論叢 Vol.8 No.-

This study is to predict and determine the future water quality in rivers using one dimensional water quality model. QUAL2EU model is adopted to simulate the water quality which was developed in U.S. E.P.A. and applied to Tamjin River at Jangheung, Jeonlanam-Do. HEC-2 model, the steady state simulation model, is used to determine the hydraulic components into and discharge coefficient water quality model. The water quality is sampled at 10 major points to check calibrating reaction coefficients of the model. For the prediction of future water quality, contamination load is calculated each year in case with and without environmental treatment facilities. The results of this method is thought more accurate to the measured than those of existing methods

밸리댄스 참가자의 참가동기 요인 분석

김장환,허은숙,엄대영 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

This study aims to confirm the existence of participating motives of those who participate in bellydance in terms of demographic characteristics to examine the role of bellydance as leisure sports and the diferences in the motives according to the degree of participation, and to study the effective aspects of bellydaqnce as a way of sound leisure activities of modern people. A total of 200 questionnaire were distributed to those who participate in the bellydance programs of the Social Education Centers and Life Long Education Centers in Seoul, Daegu and Busan and 190 of them were collected, 177 questionnaires(93.2%), except those questionnaires whose answers were not sincere and some parts of which were missing, were analyzed positively. The data of this study were processed by using SPSs/PC+11.0.Cronbach's Alpha Coefficient was calculated for Frequency Analysis and Reliability Test to confirm general characteristics. And Principal Component Factor Analysis was conducted by using Verimax Orthogonal Rotation Factor Analysis to confirm the structure of motive factors ofr participation in bellydance. In order to confirm the differences between group and in the group by each factor. One-Way (ANOVA) was conducted. The findings obtained from the study model based on these methods of the study and the analysis of the dats are as follow: First, it is confirmed that there are significant differences in the participating motives by demographic characteristics. Second, it is confirmed that there are significant differences in the participating motives by the degrees of participation.