信賴性 制約條件을 考廬한 鋼 構造物의 最適設計에 關한 硏究

林秉龍 군산대학교 1982 群山水産專門大學 硏究報告 Vol.16 No.3

The effects of temperature and salinity on the oxygen consumption of Palaemon (Exopalaemon) carinicauda HOLTHUIS were measured by Winkler method, and the effect in starved condition was also determined. The weight-specific oxygen consumption at 26℃ decreased as the body weight increased. Thus the relationship between oxygen consumption and body weight was given the regression line (Log R=1.1812-0.3120 Log W). Respiratory rate of juvenile shrimp at the temperature 10℃ appeared the presence of thermal acclimation for the groups acclimated both to salinity 20‰ and 31‰, but the group acclimated to salinity 20‰ not showed at the temperature 35℃. The oxygen consumption of shrimp was increased with the increase of temperature (10 to 35℃) and with the decrease of salinity (42 to 23℃), in which the relationship were R=0.15029 T-0.37340 and R= -0.08270 S+5.21235, respectively. While the oxygen consumption of shrimp acclimated to temperature 5℃ and salinity 15‰ were showed acclimation. ln general, Q10 values were low but showed considerable changes within the experimental temper-atures. Thus the effect of acclimation on the respiration is apparent for P. (Exopalaemon) carinicauda. When starved, oxygen consumption was markedly decreased during the period of starvation.

强度設計法에 依한 鐵筋콘크리트 뼈대 構造物의 最適設計에 관한 硏究

林秉龍 군산대학교 1986 群山水産專門大學 硏究報告 Vol.20 No.1

The aim of this study based on the ultimate strength design method is to determine the optimum sectional sizes which have the minimum construction cost of R.C. framed structure. The objective function is formulated as the total construction cost which consists of the costs of steel, concrete and forming, and the basic constrained requirements are imposed on the criteria of the standard code which is used in our country for the optimization of R.C. framed structure. The SUMT which uses the modified Newton - Raphson method is applied to solve the optimization problems of R.C. framed structure in this study. This optimization algorithm is used to determine the optimum solutions for the R.C. portal framed structure which is selected as the design example, and the numerical results by using this algorithm are compared and analyzed with those of reference (10) under the same design conditions. From this research, it is found that the optimization algorithm adopted in this study is applicable to the optimization of R.C. structures and the optimization solutions by using this algorithm are converged into the minimum values without oscilliation phenomena, and the optimum column sectional sizes are subjected to the serviciability constraints under the design conditions of this study, and the influence of the dead load in response to the variation of design variables is considered automatically into the design process.

信賴性 制約條件을 考慮한 鐵筋콘크리트 門形 뼈대 構造物의 最小經費設計

林秉龍 군산대학교 1986 群山水産專門大學 硏究報告 Vol.20 No.1

The mathematical models are formulated for minimum cost design of a reinforced conrete portal frame acting under a uniformly distributed vertical design load. Objective function for the minimum cost design is obtained by incorporating the cost of steel, concrete, and forming which are usually considered as the prime cost factors of R.C structures. Constrained reqirements for the beam are imposed the compressive stress of the concrete with reliability by W.S.D method, deflection and minimum steel ratio in the ACI Code, also for the column, the compressive stress of the concrete with reliability and minimum steel ratio. The design variables are selected to be the effective depth of beam and column, the steel areas in the beam, and the longitudinal steel area in the column. SUMT method using the Modified Newton-Raphson method is utilized to solve the numerical example of the R.C portal frame in the various contraints. The algorithm adopted in this study is numerically tested for a reinforced concrete portal frame with reliability constraints. The analysis for the results of the numerical example shows that the algorithm adopted in this study is safely applicable to the reinforced concrete structures, the coefficients of variance for the design variables and acting load are sensitively influenced on the construction cost of the R.C structures, and the optimal axial steel ratio of the column which the axial load is acted at the less position than the balanced essential length is converged to the minimum steel ratio.

2滑節 아치 構造物의 最適設計

林秉龍,鄭榮采 군산대학교 1989 群山水産專門大學 硏究報告 Vol.23 No.2

The finite difference method considering the deflections of structures is used to determine the sectional forces of arches. For the optimization of arches, the objective function equations formulate with the volume of arch, and the constrained equations formulate with respect to the criteria of stress, minimum dimensions and economic depth of arch based on the korean standard code of road bridge. The SUMT method using DFP algorithm is introduced and used to the numerical examples. And their results are compared and analyzed to examine the possibility of optimization, applicability and convergency of this algorithm. The following results are obtained through this study. 1.The initial values of design variables play an important role on the determination of the number of iterations and optimum values in the structural optimization using the SUMT method with DFP algorithm. 2.It is found that this program is used to design the structures applied with the axial force and the bending moment, because it is taken into account the buckling influence of member. 3.The total volume variation of arch due to the increase of arch rise is approximately proportional to about the increasing ratio of arch rise. 4.It makes no large difference of optimum volume between the arch with one-stiffener and the arch with non-stiffener. 5.This optimizing algorithm can be used for the optimum design of the other structures.

傳門大學 海洋土木科 敎育課情 開發硏究

林秉龍,鄭營采,申文燮,李東周,張仁奎,金榮燮 군산대학교 1982 群山水産專門大學 硏究報告 Vol.16 No.1

To carry out the study on the curriculum development for the ocean civil department in junior college, we collected and analyzed data which are on the curriculum development or improvement of the inside and outside of the country. We also gathered the opinion through the inquiring paper investigation and the consultation to the industrial organization, concerned school and authorities during 6 months from May, 1981. In addition, we analyzed and compared the present curriculum of special civil and ocean civil department in junior college. On the basis of above methods, a result we made a model curriculum shown in Table 10. Under current trend and circumstances of the industrial society, the best way for the curriculum development is to make like the course curriculum. But, it is is difficult to make the course curriculums of the ocean cavil department at present. Because the ocean civil is a branch of general civil engineering, furthermore the oceanic industry of our country is not developed well. So, dividing the major subjects in four fields for operating the model curriculum flexibly with the characteristics of the community and college, we developed the suitable curriculum in junior college course, such as general basic field, special basic field related to the ocean, special basic field related to the general civil and application field. We also tried to entensify the subjects of general basic field, special basic field related to the ocean, and to simplify the number of subjects in the model curriculum. Of course we can't say this model curriculum is perfect. But we believe firmly that the results of this paper will be a help to another curriculum development or improvement study for the ocean civil department in junior college.