본 논문에서는 Goal-Driven Optimization(GDO)을 바탕으로 한 양방향 차도선의 차량갑판의 구조설계에 대하여 최적화를 수행하였다. 차량갑판의 강도와 변형에 대한 영향을 검토하여 경제적 비용을 절약할 수 있는 최적점을 결정하였다. 실험계획법(DOE)과 반응표면법을 바탕으로 한 갑판두께를 110% 증가시켜 차량갑판의 강도와 강성을 높일 수 있었다. 이 결과에 대한 회귀분석을 수행하여 3차 다항식 모형인 최적 회귀모형식으로 제안하며 결정계수 R² 0.98정도로 나타내어 신뢰성을 확보할 수 있었다.

간척지 내 토양은 염분농도 및 함수비가 일반지역에 비해 상당히 높기 때문에 간척지에 매입된 온실의 부재는 높은 부식 환경에 노출된다. 염해의 환경에서는 파이프 골조로 이루어진 온실의 기초 및 기초와 이어진 파이프에 부식을 촉진시키기 때문에 이에 대한 보수/보강 기술개발 및 효율적인 유지 관리가 필요하다. 본 연구에서는 염해의 위험성이 높은 간척지에 적합한 온실의 유지관리, 보수/보강에 대한 기준을 마련하기 위한 기초자료로서 토양염분환경에서 온실부재의 부식속도를 측정하였다. 각 온실파이프는 염분농도가 0%, 0.1%, 0.3% 및 0.5%인 토양 및 수중환경에 관찰기간동안(480일) 노출시켜 부식속도를 측정하였으며, 그 결과 육안으로도 염분 농도에 따른 부식정도의 차이가 뚜렷하게 관찰되었으며, 시험편의 표면이 검은색의 부식현상과 함께 비교적 고르게 부식되는 균일부식의 형태를 나타내었다. 논토양의 경우 염분농도 0, 0.1, 0.3, 0.5%에서 각각 0.008, 0.027, 0.036, 0.043mm·yr-1로 염분농도가 증가할수록 부식속도가 뚜렷하게 증가하는 경향을 나타내었고 밭토양의 경우, 염 분농도 0, 0.1, 0.3, 0.5%에서 각각 0.0002, 0.039, 0.040, 0.039mm·yr-1의 부식속도를 나타내었다. 상대적으로 세립질이 많은 논토양에서 부식속도가 더 높은 것으 로 나타났으며, 이는 입경이 작고 고르게 분포하는 토양 에서 부식속도가 높은 일반적인 특성이 그대로 반영된 것으로 판단되었다. 간척지의 경우 토양의 입자의 세립 정도는 일반 내륙지역의 농경지 토양보다 높을 것으로 예상되기 때문에 파이프 부식에 대한 철저한 대비가 있 어야 할 것으로 판단되었다.

The purpose of this study is to research into which characteristic is shown according to a change in filler metal in case of CO2 gas arc welding by using Automobile Structural Steel(ATOS80). The major characteristics of this study were experimented by having Bevel angle as 50°, Root gap as 3mm, Filler metal as Solid wire & Flux wire, and the projected length of wire as 15mm. This study made the welded test specimens for the KS specification in advance suitably for the conditions, thereby having comparatively analyzed with the data value that was obtained through tensile test, hardness test, impact test and Macro Structure Detecting. Arranging the results that analyzed finally, the tensile strength and the hardness appeared to be excellent in case of welding with flux wire. The impact strength was indicated to be superior in case of welding with solid wire.

The new rotary friction damper was developed using several two-nodal rotary frictional components with different clamping forces. Because of these components, the rotary friction damper can be activated by building movements due to lateral forces such as a wind and earthquake. In this paper, various dependency tests such as displacement amplitude, forcing frequency and long term cyclic loading were carried out to evaluate on the structural performance and the multi-slip mechanism of the new damper. Test results show that the multi-slip mechanism is verified and friction coefficients are dependent on displacement amplitute and forcing frequency except long term cyclic loading.

To overcome the weakness of spread foundation in large space structure, the research of precast pile for replace spread foundation have been conducted. The new type of joint between PHC pile and steel column is named HAT Joint(Hollow hAlf-sphere cast-sTeel Joint). It connected PHC Pile by bolt that verification of bolt connection should be accomplished. In this paper, pull-out test and flexural performance for HAT Joint to verifying the bolt connection is explained. As a result, the pull-out and flexural capacities of bolt were checked to use in real structure. Furthermore, the equation of pull-out strength was proposed.

Various hybrid dampers have been developed in Korea to control the vibration due to a wind and earthquake. In order to minimize the installment space, cost and construction process, the new hybrid friction damper is developed. This hybrid damper is composed of several rotary friction components having two frictional joint. Because of these components, the building vibration due to wind and earthquake can be mitigated by hybrid friction damper. In this paper, various dependency tests were carried out to evaluate on the structural performance of two joint rotational friction component of the hybrid damper. Test results show that two joint rotational components do not depend on a displacement and a frequency of forcing but friction coefficients is reducing as a clamping force is increasing.

The finite element analysis of large sized rectangular water tank structures made of stainless steel materials is carried out for various combined load cases. The combined load cases for a large size of 5,000ton are further determined using the specification(KS B　6283) established from the Korean Standards Association. For the better numerical efficiency, the rectangular panels are modelled using the ANSYS program. The numerical results obtained for different load cases show as follows. In order to resist the snow load, it takes the influence of the gap than the size of the column. Also, in order to resist the water pressure, it shall increase the thickness of the wall. But, increasing the thickness of the wall is considerably less economical. Therefore, the angle with big thickness should be placed right next to the wall.

The industrialization and urbanization forced to increase the density of pipelines such as water supply, sewers, and gas pipelines. The materials used for the existing pipe lines are mostly composed of concretes and steels, but it is true that the development for more durable and efficient materials has been continued performed to produce long lasting pipe lines. Recently, underground pipes serve in diverse applications such as sewer lines, drain lines, water mains, gas lines, telephone and electrical conduits, culverts, oil lines, etc. In this paper, we present the result of investigation pertaining to the structural behavior of unplasticized polyvinyl chloride (PVC-U) flexible pipes buried underground. In the investigation of structural behavior such as a ring deflection, pipe stiffness, 4-point bending test, experimental and analytical studies are conducted. In addition, pipe stiffness is determined by the parallel plate loading tests and the finite element analysis. The difference between test and analysis is about 8% although there are significant variations in the mechanical properties of the pipe material. In addition, it was found by the 4-point bending test there is no problem in the connection between the pipes by coupler.

In this paper, we present the result of analytical investigation pertaining to the structural behavior of steel-concrete composite plate girder with arch-type web stiffener. In the arch-type web stiffener located in the compression side of web, infill concrete is cast to strengthen the arch-type stiffener and also to exert resisting force against compression force. This type of composite steel-concrete plate girder bridge is built and is in service. To understand the behavior thoroughly, analytical parametric study was conducted by using the finite element method. As a result it was found that the effect of arch-type stiffener with infill concrete is considerable for the design of such type composite girder bridge.

Numerical analysis was performed to analysis the structural characteristics of the head device in the road mower system. The head device connects mower system with the boom of the special vehicle. The system with various road surface conditions is subjected to continuous vibration and repeated load. Especially, the maximum equivalent stress occurs in the pillar of the head device, and the maximum equivalent strain also occurs in the fixed plate that supports the mower system. Fatigue analysis results show that the upper end of the pillar is very vulnerable. This analysis results can be used as basic data for optimal road mower head system design.

This study on Structural analysis of kickboard used two types suspension systems. Kickboard is very dangerous in rider because of unstable in diving conditions. Thus suspension system of kickboard are very important component parts. This study focus on two suspensions for stability in kickboard which coil spring and aluminium leaf spring.

현대사회는 조직구성원들의 혁신을 요구하는 지식기반 사회이며, 인적자원의 관리와 혁신이 기업의 경 쟁력을 높이는 중요한 요인으로 작용하고 있다. 이러한 상황에서 기업조직은 구성원들의 혁신을 지향하 는 적극적인 리더십의 발휘를 통해 구성원들의 바람직한 행동을 이끌어 내고, 이를 매개할 수 있는 요인 을 찾기 위한 노력을 해야 한다. 이에 본 연구의 목적은 리더십의 효과성에 대한 연구의 필요성이 제기 되고 있는 리더의 감성지능과 리더의 진정성이 부하의 셀프리더십 및 부하의 혁신행동에 어떠한 영향을 미치는지와 이러한 리더의 감성지능 및 리더의 진정성이 부하의 혁신행동에 미치는 영향력에 대한 부하 의 셀프리더십 매개효과를 검증하기 위한 것이다. 이러한 연구 목적을 위해 부산과 경남의 13개 제조기업 317명의 구성원을 대상으로 실증연구를 실시하였다. 연구결과, 첫째, 리더의 감성지능과 리더의 진정성은 각각 부하의 혁신행동에 긍정적인 정(+)의 영향을 미치고 있음이 확인되었다. 둘째, 리더의 감성지능과 리더의 진정성은 각각 부하의 셀프리더십에 긍정적인 정(+)의 영향을 미치고 있음이 확인되었다. 셋째, 부하들의 셀프리더십이 혁신행동에 유의한 긍정적 정(+)의 영향을 미치고 있음을 검증하였다. 넷째, 리더 의 감성지능과 부하의 혁신행동 간의 관계 및 리더의 진정성과 부하의 혁신행동의 관계에서 부하의 셀프 리더십 매개효과를 검증한 결과, 각 관계별로 부하의 셀프리더십의 매개효과가 있음을 검증하였다. 이는 부하의 셀프리더십이 리더십과 부하의 혁신행동의 관계에 적극적인 영향을 미치고 있음을 알 수 있다. 본 연구는 리더의 감성지능과 진정성이 부하의 셀프리더십을 매개로 부하의 혁신행동에 영향을 주고 있다는 종합적인 새로운 모델을 제시하였다는 이론적 시사점과 조직에서 구성원들의 혁신행동을 강화하 기 위해서는 리더의 감성지능과 진정성, 그리고 부하의 셀프리더십의 역할이 중요하다는 실무적 시사점 을 제공한다. 마지막으로 본 연구의 한계와 향후연구 방향을 제시하였다.

Objective : The main purpose of this study was to analyze the structural relationship among factors that have an impact on Health-Related Quality of Life (HRQOL) in three groups: A stroke patient group (Exp 1), high-risk stroke patient group (Exp 2), and a normal control group.Methods : For this survey, we conducted a secondary analysis using ‘the fifth Korea national health and nutrition examination survey (2010-2011)’, and investigated 2,293 elderly people over 65 years in age.Results :The results were as follows: HRQOL had a significant difference among groups (control›Exp2›Exp1) (p<.05). In the total effect of the experimental 1 groups, their HRQOL was significantly affected by their mental health (β=.425), self-rated health (β=.391), and medical health (β=.290)(p<.05). In the total effect of the experimental 2 group, their HRQOL was significantly by their self-rated health (β=.425), medical health (β =.272), mental health (β=.249), and functional health (β=.234) (p<.05). In the total effect of the control group, their HRQOL was significantly affected by their self-rated health (β=.398) and mental health (β=.184)(p<.05).Conclusion : In conclusion, this study suggested two matters to improve the HRQOL in people with or without a stroke. First, to improve the HRQOL in people suffering from senility, a different approach is needed according to whether the person has had or not had a stoke. Particularly in stroke patients, we should treat both their physical disability and mental health. Second, regardless of whether they have had a stroke, their HRQOL is influenced strongly by their self-rated level of health, and therefore an improvement of HRQOL will be induced by promoting positive health behaviors.

This paper presents on the structural behavior of the the methyl methacrylate monomer (MMA) double wide flanged the glass fiber-reinforced polymer(GFRP) pipe composite structures for the manhole raise. The evaluation of structural performance on this composite structure was conducted by the axial load, fatigue load, and ultimate load test. The assessment indicates that the MMA double wide flanged GFRP pipe composite structures was confirmed safety, durability and reliability in result as expected. It was found that this composite structure was able to short working times to around 30-50% and construction costs to around 10-23% with compare other construction methods. Also, environmental pollution and civil complaints will be prevented because there will be no longer any noises, vibrations, dust, or construction wastes.

In this study we developed an integrated precast concrete decks for a rapid construction. The structural performance in the integrated precast bridge decks is evaluated by real-scale test bed and detailed finite element analyses. The numerical analysis results were compared with the experimental data from a real-scaled single-span precast/prestressed concrete bridge decks under truck loading. Parametric studies are focused on the various effects of external loads on the structural behavior for different locations and measuring points on the precast bridge decks. The assessment in this study indicates that the integrated precast bridge decks show an excellent structural performance as expected.

Various hybrid dampers have been developed as increasing tall buildings in Korea. To minimize the installment space and cost, the new hybrid friction damper was developed using friction components. It is composed of two one-nodal rotary frictional components and a slotted bolted frictional connection. Because of these components, hybrid friction damper can be activated by building movements due to lateral forces such as a wind and earthquake. In this paper, displacement amplitude dependency tests were carried out to evaluate on the structural performance and the multi-slip mechanism of the hybrid damper. Test results show that the multi-slip mechanism is verified and friction coefficients are increasing as displacement amplitudes are increasing.

This paper presents a foundation pile to steel column connection that can resist large magnitude of moment and that can be easy installed. The developed joint has spherical shape and it is given the name HAT joint to mean Hallow half-sphere steel joint. Four types of HAT joints are developed. Namely, H-type, T-type, P-type and K-type. In this paper I will talk about the performance assessment of T-type(Tube Column) and P-type(Pile Column) of HAT joints with finite element analysis and experiment on a full scale model is presented.