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오상진,박상혁,박병호 대한교통학회 2008 대한교통학회지 Vol.26 No.4
The goals of this study are to develop travel time functions based on intersection delay and to analyze the applicability of the functions to traffic assignment models. The study begins with the premise that the existing assignment models can not effectively account for intersection delay time. In pursuing the goals, this study gives particular attention to dividing the link travel time into link moving time and stopped time at node, making the models based on such variables as the travel speed, volume, geometry, and signal data of signalized intersections in Cheongju, and analyzing the applicability of these models to traffic assignment. There are several major findings. First, the study presents the revised percentage of lanes (considering type of intersection) instead of g/C for calculating intersection delay, which is analyzed to be significant in the paired t-test. Second, the assigned results of applying these models to the Cheongju network in EMME/2 are compared with the data observed from a test car survey in Cheongju. The analyses show that the BPR models do not consider the intersection delay, but the modified uniform delay model and modified Webster model are comparatively well fitted to the observed data. Finally, the assigned results of applying these models are statistically compared with the test car survey data in assigned volume, travel time, and average speed. The results show that the estimates from the divided travel time model are better fitted to observed data than those from the BPR model 본 연구는 교차로 지체를 고려한 통행시간함수를 개발하고, 이를 도시가로망에 적용하여 분석하는데 그 목적을 두고 있다. 이는 기존 통행배정 모형이 교차로 지체를 적절히 고려하지 못하고 있다는 분석에 근거하고 있다. 이를 위하여 본 연구에서는 링크의 통행시간을 구간 순행시간과 교차로 지체시간으로 구분하고, 청주시 주행속도, 교통량, 기하구조 및 신호운영 자료 등을 수집하여 계획단계에 적절한 구간 순행시간과 교차로 지체시간 산출모형을 구축하고, 이를 통행배정 단계에 적용하여 그 타당성을 분석하는데 중점을 두고 있다. 주요 연구결과는 다음과 같다. 첫째, 교차로 지체시간을 산출하기 위해 교차로의 녹색시간비 대신 접근로의 차로수비율을 교차로 유형별로 보정한 후, 이를 실제 녹색시간비율과의 t-검정을 시행하여, 평균값에 차이가 없다는 귀무가설을 기각할 수 없는 것으로 분석되어, 보정 차로수비율을 모형구축에 적용하였다. 둘째, 기존의 BPR모형과 보정 차로수비를 이용한 균일지체기반 수정모형 및 Webster기반 수정모형을 청주시 가로망에 EMME/2를 활용하여 통행배정하여 주행속도 조사자료와 비교한 결과, BPR모형은 교차로 지체의 영향을 반영하지 못하는 것으로 나타난 반면에 균일지체기반 수정모형과 Webster기반 수정모형은 관측된 조사자료에 보다 근접한 결과를 보였다. 셋째, 이들 모형의 배정결과와 실측 통행시간, 교통량, 평균통행속도간 통계검증 결과 통행시간 분리모형이 BPR모형 보다 실측치와의 통계적 오차가 감소하는 것으로 분석되었다.
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李炳求,吳相晋 圓光大學校大學院 1990 論文集 Vol.6 No.-
A method is developed for solving the Bernoulli-Euler equation governing the elastica of post-buckled columns. The Runge-Kutta method and Shooting method are used to perform the integration of the differential equations and to determine the angle of rotation at left end, respectively. As the numerical results, the relations between nondimensional load the angle of rotation at left end, the horizontal deflection, and the vertical deflection at midpoint are presented in figures. Also typical elastica of post-buckled columns are presented in figures.
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오상진,이병구,이인원 한국소음진동공학회 1998 소음 진동 Vol.8 No.3
The purpose of this paper is to investigate the free vibrations of horizontally curved beams resting on Winkler-type foundations. Based on the classical Bernoulli-Euler beam theory, the governing differential equations for circular curved beams are derived and solved numerically. Hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered in numerical examples. The free vibration frequencies calculated using the present analysis have been compared with the finite element's results computed by the software ADINA. Numerical results are presented to show the effects on the natural frequencies of curved beams of the horizontal rise to span length ratio, the foundation parameter, and the width ratio of contact area between the beam and foundation.
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오상진 전남도립대학교 2009 전남도립대학교 논문집 Vol.11 No.-
This paper deals with the coupled flexural-torsional vibrations of open thin-walled beams having single symmetrical axis. The governing differential equations for free vibration of such beams, including the effects of warping stiffness, shear deformation and rotatory inertia, are solved numerically to obtain frequencies and mode shapes. A series of calculations are performed to investigate the influence of the dimensions of the open channel section (i.e., depth, width and wall thickness) on the natural frequencies and mode shapes when the beam is clamped-free end.
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상단에 집중질량을 갖는 유체에 잠긴 기둥의 자유진동 특성
오상진 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.1
This paper deals with the free vibrations of columns immersed in fluid. The column model is based on the classical Bernoulli-euler theory which neblects the effects of rotatory inerital and shear deformation. The eccentricity and rotatory inertial of the concentrated mass at the top are taken into accuont. In the governing equation for the free vibration of column, thedensity of immersed part was midified to account for theadded fluid mass. The govering differential equations are solved numerically using the corresponding boundary conditions. The lowest four natural frequencies and corresponding mode shapes are calculated over a range of non-dimensional system parameters ; the mas density ration of fluid to column, the ratio of fluid depth to span length, the ratio of tip mass to total column mass, the dimensionless mass moment of inertia, and the eccentricity.
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오상진,모정만 전남도립대학교 2000 전남도립대학교 논문집 Vol.2 No.-
The main purpose of this paper is to present a fuzzy extension for the classical behavior problems of steel sheet pile. The membership functions of the soil pressures at the lower water level and the dredge line, the penetration depth, the maximum moment, and the required section modulus are calculated for the steel sheet piles with fuzzily specified mediums: the angle of internal friction, the moisture unit weight, the saturated unit weight, and the allowable stress. The vertex method is used to evaluate the fuzzy functions. The index of fuzziness to quantitatively describe the propagation of fuzziness in the behavior is defined. It is expected that the designer, using the index of fuzziness, can provide suitable margins of safety in regions of maximum fuzziness.
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