By thermal-structural coupled stress analysis, the equivalent stress and total deformation of girder under the influence of the temperature of the liquid within pipeline of pipe-rack structure is studied. Firstly, steady-state thermal analysis is carried out using a commercial software. Then, to perform a thermal-structural coupled stress solution, structural analysis is linked to the thermal model at the Solution level. The simulation results showed that the stress ratio that considers the pipe’s temperature for thermal-structural coupled stress analysis is higher than the stress ratio that consider only the pipe’s weight for structural analysis. The thermal stress caused by temperature convection is found to be influential on the pipe rack structure.

This study presents investigation study on the structural health monitoring system for the over-pass bridge connected to the passanger terminal of Inchoen International Airport. The bridge structure designed very conseratively was found to be structurally safe and well-operating based on the measured records over the last 10 years. However, the structural health monitoring system is recommended to be investigated again in a regular basis of every 2~3 years to ensure reliability of measurements.

In this paper, we suggest the new floating type photovoltaic energy generation system, which is improved the structural and economical efficiency, compared with the system developed in the previous research. The structural system in new floating type photovoltaic energy generation system reveals better in structural performance.

In this study, we conducted Life-Cycle Reliability Analysis Classified by Structure Movements in Removal PSC Beam Bridge. in short, we secured experimental values of bridge design factor and perform a detailed behavior analysis of structure system. finally, we could accomplish an Life-Cycle Reliability Analysis with considering of an environmental factor and variability of loading. We defined limit state function by statistical method (Response Surface Method, RSM) and calculated confidence indicator and Probability of Failure using reliability interpretation technique(FORM). eventually, we could compute Performance Profile and compare deterioration form according to time history by structure movements.

To contribute to efficient and safe inspection and maintenance of underwater facilities by identifying the damage status of underwater parts through collecting and analyzing local and overseas data. The carrying out actual underwater surveys to perform characteristics analysis and evaluation on the underwater facilities and present a Application Method of 3-D side scan sonar for Assessment of Underwater Structures.

This paper presents a subspace system identification algorithm for time-invariant structural system. System matrices are estimated from input-output data. The main computational tools are the LQ and the singular value decomposition in subspace system identification. The accuracy and stability of estimated system matrices are influenced by the parameters of Hankel matrix. For stable SI, the optimal parameters of Hankel matrix are determined by considering the computational cost and the accuracy of system matrix.

This study mainly focuses on presenting a rational procedure of assessing target reliability level of nuclear containment. The target reliability level can be obtained by considering LCC(Life Cycle Cost) of damage and operation. The LCC evaluation results in the different environmental situations. It is verified that this deviation of LCC can be adjusted by selecting the proper initial target reliability. In addition, slight increase of initial target reliability for the nuclear containment aiming a longer service life, therefore, the total expected loss during the extended service years can be maintained in the same level as the total loss expected in the 20-year service life for the existing containment structures.

Shear panel steel damper has been widely used as seismic energy absorption device because it is economical and effective. It dissipates seismic energy by plastic deformation and fatigue resistant around welded part. However, due to early deformation of the panel under cyclic loading, the resisting strength decreases, so that the resisting capacity of the panel needs to be increased. In this paper, to investigate the improved damper called advanced shear panel damper (ASPD), both plastic deformation and resisting capacity was carried out non-linear FEA. In addition, the analysis result was compared with static loading test for verification.

The purpose of this work is to study the adsorption and desorption characteristics of acetone vapor and toluene vapor from adsorption tower in the VOCs recovery device. The six kinds of activated carbon with different pore structures were used and the adsorption and desorption characteristics were compared according to pore structure, desorption temperature, and adsorption method, respectively. Adsorption capacity of acetone vapor and toluene vapor by batch method was higher than that by dynamic method. Especially, activated carbon with medium-sized or large pores had more difference in adsorption capacity according to adsorption methods as a result of gradually condensation of vapors on relatively mesopore and large pores. Activated carbons with relatively large pores and relatively small saturated adsorption capacity had excellent desorption ability.

본 연구는 총 50개의 SSR primer를 이용하여 색소옥수수(색소종실 옥수수 12계통, 색소찰 옥수수 12계통) 및 비색소옥수수(종실옥수수 2계통, 찰옥수수 5계통) 계통들에 대하여 유전적 다양성, 계통유연관계 및 집단구조를 분석하였다.1. 그 결과 50 개의 SSR primer들은 색소 및 비색소옥수수 31계통들에서 총 282개의 대립단편을 증폭시켰으며, SSR primer들에서 증폭된 대립단편의 수는 최소 2개에서부터 최대 11개까지의 범위로 나타나 평균 5.64개가 증폭되었다. MAF(major allele frequency)는 0.23(bnlg279)에서 0.90(umc2338)의 범위로 나타나, SSR primer 당 평균 0.45개로 나타났고, 유전적 다양성(GD)값은 0.17(umc2338)에서 0.86(bnlg279)의 범위로 나타나, SSR primer 당 평균 0.67의 값을 나타내었다. 2. 31개의 색소 및 비색소옥수수 계통들의 집단구조를 분석한 결과, 이들 옥수수 계통들은 Groups I, II, III, IV, V, admixed로 구분되었다. Group I은 찰옥수수 1계통, 색소종실옥수수 1계통, 색소찰옥수수 5계통이 포함되었고, Group II는 찰옥수수 1계통, 색소찰옥수수 3계통이, Group III는 색소종실옥수수 3계통, Group IV는 색소종실옥수수 2계통이, Group V는 종실옥수수 2계통, 찰옥수수 2계통, 색소종실옥수수 5계통이 포함되어 있었다. 그리고 admixed group에는 찰옥수수 1계통, 색소종실옥수수 1계통, 색소찰옥수수 4계통 이 포함되어 있었다.3. UPGMA법에 의한 계통유연관계 분석 결과, 31개의 색소 및 비색소옥수수 계통들은 유전적 유사성 27.4%의 수준에서 크게 3개의 그룹으로 나누어졌다. Group I은 10개의 옥수수 계통(종실옥수수 2계통, 찰옥수수 2계통, 색소종실옥수수 6계통)을 포함하고 있었고, Group II는 20개의 옥수수 계통(찰옥수수 3계통, 색소종실옥수수 5계통, 색소찰옥수수 12계통)을, 그리고 Group III은 색소종실옥수수 1계통을 포함하고 있었다. 따라서 본 연구의 결과는 앞으로 강원도 농업기술원 옥수수시험장에서 색소옥수수 자식계통들에 대한 선발과 품종 육성 연구에 유용한 정보를 제공할 것으로 생각된다.

이 논문에서는 대표적 수치해석에의 균열처리 방법으로 손상모델 기반의 분산균열모델을 체택하여 구조내력을 산정하였다. 또한 전력구 구조물의 실구조 모델링을 위해 3차원 해석방법을 택하였으며 3차원 콘크리트 구성모델로는 현재 3차원 모델중 콘크리트의 다축압축, 인장균열을 효과적으로 모사하는 미소면 모델(Microplane model)을 재료모델로 사용하여 비선형 유한요소해석을 수행하였다. SFRC의 인장연화곡선을 얻기 위해 역해석법을 사용하였으며, 역해석으로 구한 인장연화곡선이 실험결과와 아주 잘 일치함을 보였다. 하중-균열폭 관계를 입력값으로 사용한 역해석 결과와 하중-CMOD 관계를 사용한 역해석 결과는 서로 잘 일치하는 경향을 나타냈다. 이 논문에서는 실험으로부터 측정된 균열폭 데이터와 수치해석시의 손상지수와의 관계를 도출하여으며, 이와 같은 결과는 향후 균열탐사를 통한 구조물의 잔존 구조내력 산정에 적용할 수 있으리라 판단된다.

This study aims to find out the geographical distribution, the physical structure and characteristic of Gudle-jang Paddy-field in Cheongsando. On the basis of this study, the potential value and the assignment for the preservation of Gudle-jang Paddy-field were suggested. Gudle-jang Paddy-field is centrally distributed to Cheongsando and has various features as follows. First, it has the Ondol structure which is used Gudle-jang. Second, it has an irrigation canal which has functions of the tank and the prevention of cold-weather damage as well as the irrigation and drainage canal. The values of Gudle-jang Paddy-field are as follows; 1) It is the peculiar and inherent agricultural structure which is only found in Cheongsando. 2) It is the structure that the agricultural civil engineering and the agricultural water management technique of traditional methode are applied. 3) It has the worths of the traditional culture of Korea. 4) It is the important resource creating superb rural landscape of the region. In spite of these values of Gudle-jang Paddy-field, there were little efforts to preserve it. From now on, it is needed to form of sympathy about the value of Gudle-jang Paddy-field and to make efforts for preservation of it. Also the institutional and political strategy should be provided to preserve and manage Gudle-jang Paddy-field.