PURPOSES :The purpose of this study is to perform a reliability analysis of the proposed wind load combination which governs the design of support structures of subsidiary road facilities, and to evaluate whether the target reliability of the design is satisfied.METHODS :The statistical estimation method is applied and the design period of the support structure is used to obtain the statistical property of the wind load. In addition, the statistical properties of the strength of support structures are obtained from a literature review and simulation study. Actual support structures are designed by the proposed load combination and are used as the examples to examine if the target reliability is obtained.RESULTS :The result of the reliability analysis performed by using the statistical properties of load and resistance for the support structure in this study indicates that the proposed wind load combination satisfied the target reliability index of the design. Also, the convenience of the design is achieved by adopting the same design wind velocity given in the bridge design code by applying the wind velocity ratio defined for the design period of the support structure.CONCLUSIONS :It is presented that the design using the wind load combination proposed in this study achieved the target reliability index and the design wind load for different design periods can be conveniently defined by applying the velocity ratio proposed in this study.

As a preparation of a design standard regarding road facilities, such as cantilever columns for traffic lights, optimum design and risk assessment for foundation of street lights on highways are proposed. The preliminary evaluation of optimization with reliability assessment resultantly makes it possible to reduce not only the duration of construction but the cost of construction as well. Ultimate limit states and constraints functions are selected for the sliding, overturning and settlement of the foundation under external loads from super and sub-structures itself. An example foundation under the super structure of height 12m, is optimized as 30% decreased embedded depth of foundation, in which as increasing the depth of embedded connection parts, the necessary depth of foundation is deceased. However, the optimum depths and the reliability indices are sensitively dependent with earth properties and dimensions of foundation.

매년 증가하고 있는 풍해에 대한 대책으로서의 내풍설계는 필수적이다. 사과나무 지주시스템의 내풍설계를 위해서는 우선적으로 사과나무에 작용하는 풍하중을 파악해야 하고, 이를 위해서는 사과나무의 항력계수 산정이 필요하다. 기존 항력계수 산정 방법에서 발생할 수 있는 실험적 오차 등의 문제점을 보완하고자, 하중 측정 장치의 제작을 통한 풍하중 직접 측정 및 이를 통한 항력계수의 역추정 과정을 수행하였다. 풍속이 증가할수록 항력계수는 감소하며 점차 수렴하는 경향을 나타냈으며, 풍속 30m/s 일 때, 전면적 기준 약 0.176, 순면적 기준 약 0.356 의 값을 갖는 것으로 나타났다.

This study performed a finite element crash analysis of support structures made of various composite materials for road facilities. The effects of different material properties of composites for various parameters are studied using the finite element commercial package for this study. In this study, the existing finite element analysis of composite post structures using the LS-DYNA program is further extended to compare dynamic behaviors against car crash of the structures made of various composite materials. The several numerical examples show the comparison of the nonlinear dynamic effects for different materials.

This study carried out real car crash simulation of composite post structures for road facilities. The effects of different material properties of composites for various parameters are studied using the LS-DYNA finite element program for this study. In this study, the existing finite element analysis of steel post structures using the LS-DYNA program is further extended to study dynamic behaviors of the structures made of various composite materials. The numerical results for various parameters are verified by comparing different models with displacements and stress distribution occurred in the post and car.

정보 통신 산업이 비약적으로 발달하고, 디지털컨버전스(Digital Convergence) 시대가 도래함에 따라, 각 정보주체들의 정보를 자신들의 의도에 따라 유지 관리하고, 보호하는 것은 시대적 요청으로 급부상하였다. 그에 따른 각 분야별 정보보호 산업이 비약적으로 발전하게 되었음은 물론이다. 정보보호 산업 전체의 경쟁력을 제고 하고, 기술발전과 국제경쟁력을 키우기 위해서는 여러 정보보호 기업들을 조직적으로 관리하고, 각 분야별 전문 업체를 유기적으로 결합시키도록 하는 것이 요청되며, 정보보호 지주회사의 설립은 이러한 요구에 부응하는 하나의 제도적 방안이 될 수 있다. 정보보호 지주회사의 설립으로 소기의 목적을 달성하기 위해서는, 정보보호 지주회사에 대한 법적 성격 구명 등 기본 연구가 필요하다. 현재 주도적 정보보호 기업을 대상으로 그 지배구조와 사업범위, 조직 형태를 법적 관점에서 분석하고, 이를 바탕으로 우리 법제도 하에서 정보보호 지주회사의 활용 가능성을 타진해 본다.