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박광규,김영철 大田大學校 産業技術硏究所 1998 산업기술연구소 論文集 Vol.9 No.1
The reinforcing method of steel girder bridge is investigated in this papers. In order to stiffen the main girder, the hollow pipe arch is used without increasing the pier. The following conclusions can be made from the results in this study. 1. In the case of supporting the girder at the middle of the span, the reduction of bending moment is about 50-60%. 2. The bending moment at pipe arch is very small. Therefore, it is no matter to use a pipe which have small diameter, if that can resist an axial force. 3. There are many advantages in the steel bridge so that this kind research is needed continually.
박광규,이승원,김문겸,황학주 연세대학교 산업기술연구소 1986 논문집 Vol.18 No.2
Half space problems of structural system, which are usually solved using simple truncation of far field or using analytical far field solution, are considered using infinite elements. Among the infinite elements previously developed, a mapped infinite element is adopted and implemented in a finite element code which can handle two dimensional problems. Implemented program is applied to a cavity problem subject to internal pressure. The resulting solutions are compared with boundary element solutions due to Brebbia. In addition, conventional finite element analyses with simple truncation are carried out to compare the efficiency and accuracy of the developed program. The results show that the developed program renders accurate solutions which are close to the known values. Also, it can be seen that the developed program requires a smaller number of elements, so as shorter computing time than the conventional finite element codes, to get the same degree of accuracy.
트랙터 부착용 로더 기구부의 기구학적 시뮬레이션 프로그램 개발
이규승,박원엽,노광모,김준호 성균관대학교 생명공학연구소 1999 生命工學硏究 Vol.5 No.1
A loader mechanism mounted on tractor was modeled for kinematic analysis, and a computer simulation program was developed by using Cartesian coordinate approach, in order to remove the burden of routine derivation and computation from the engineer. The results of kinematic analysis was compared with those of a commercial CAD program. The results of this study was summarized as follows. 1. The results of the simulation showed good agreement with results of the commercial CAD program. This program could be used for predicting the kinematic properties of each links on the loader mechanism. 2. The velocity of bucket which affect the performance of loader increased very quickly just before the finishing point of boom operation, and acceleration also increased sharply at this point. Thus it is concluded that when bucket is rolling, maximum reaction force arises. 3. Velocity and acceleration of each links on the loader mechanism changed very quickly when the bucket cylinder started operation.
이기세,박광규 大田大學校 産業技術硏究所 1996 산업기술연구소 論文集 Vol.7 No.1
Upon using the newly constructed pavement for a long time, the efficiency of the pavement which was constructed based on the proper design procedure will be dropped with times. Thus, it is going to be hard to keep the designed performance of a constructed pavement continuously. To meet the designed performance of the pavement which is lowered by undertaking repeated traffic loadings for a long time it can be a critical to rehabilitate effectively existing pavement at proper time to give always structurely and functionally stable pavement. To rehabilitate a pavement using a selected method at a optimum time, the pavement performance model may be needed to determine the time and the method for rehabilitation. In this paper a pavement performance models was developed and provided. It is the pavement performance model with roughness index and other distresses as independent variables.
이범선,박광규 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.2
Based on the equilibrium equations and the D'Alembert principle, the governing equations for simple beam subjected to harmonic load are derived in this study. A trial eigenvalue method is used for determining the natural frequencies. The harmonic vibration analysis for an simple beam with an uniform cross-section, using finite element method, was investigated. The result in this study was consisted with the values obtained by other numerical method and SAP2000.
노경륜,박광규 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.2
Stability investigation for standard sections of retaining walls, in order to evaluate the efficiency of the standard section used in field work, is carried out in this paper. On purpose to do this, the safety factor of sliding, overturning and ground bearing capacity, is investigated. The typical drawing made by the Ministry of the Agriculture and Forestry and the Ministry of Construction and Traffic is used in this paper. The computer program on the stability analysis process is developed. As a result of this study, it is turned out that the standard sections have some problems that must be improved.
大場 新太郞,朴光圭 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.1
The vibrational investigation of the great Palsangjon, which was made of wood and consisted of the five story, was carried out in this paper. The first natural period. the second natural period, and the damping coefficient for this pagoda were measured. And these values are compared with those of Japanese wooden pagoda. Based upon this field experiment, the following results were drawn : (1) The first natural period were 0.78 sec. and the second natural period were 0.34 sec. (2) The damping coefficient for this pagoda were 0.4 percent. (3) Though the wooden Palsangjon is different in the structural form from the wooden in Japan. the dynamic characteristics in the Korean wooden pagoda is similar to those of the Japanese wooden pagoda.
지지조건(支持條件)을 고려(考慮)한 낮은 포물선(抛物線) 아치의 동적(動的) 임계하중(臨界荷重)의 해석(解析)
박광규 ( Park Kwang Kyou ) 한국농공학회 1986 韓國農工學會誌 : 전원과 자원 Vol.28 No.2
The differential equation, which can determine the dynamic critical loads for low parabolic arches, is derived in this study. The dynamic critical loads of the parabolic arches subjected to a concentrated step load are nummerically analyzed for the changes of load positions. In cases of arches with different end conditions (both hinged, fixed hinged, both fixed), the effect of end conditions and that of the rises are investigated in detail. The summary of the results are the following: 1) The snapthrough does not occur when the rise of arch is very low, and the bifurcation appears clearly as the rise of arch increases. 2) The regions in which the dynamic critical loads are not defined for the both ends fixed are broader than that for the both ends hinged. 3) For all case, the load positions of minimum dynamic critical loads exsit at the near position from the end hinged. Thus, the results obtained in present study show that the magnitude of dynamic critical loads, the load positions of minimum dynamic critical loads and the regions in which the dynamic critical loads are not defined depend on end conditions of arches.