ITS 토목구조물의 최적형식 결정

정지승,문대중 東洋大學校 産業技術硏究所 2002 東洋大學校 産業技術硏究所 論文集 Vol.4 No.1

This study presents a determination of optimum types for ITS(Intelligent Transport Systems) civil structures. The determination of types for the structures is considered to be an important subject since the structures are generally constructed on the city center. The safeties, aesthetic values, promptness of construction and working conditions are especially considered to plan and design the structures. This paper described the determination progress of types for the structures at the jeonju city-planning, designing of superstructure and foundation. Form the results of types for the structures, it may be positively stated that the determination progress of the design for the structures should be useful for designing of other ITS structures.

철도시설물 인접굴착공사에 따른 운행선 궤도의 궤도틀림 영향 평가

정지승,박동룡,최정열 국제문화기술진흥원 2019 The Journal of the Convergence on Culture Technolo Vol.5 No.4

The three-dimensional precision numerical analysis was performed using the finite element model applied with the railway track model consisting of rails, sleepers, and track elastic springs(ballast, rail pad). As a result of analyzing the track deformation level of the existing tracks due to the excavation work adjacent to the railway facilities, it was found that the track irregularity evaluation criteria (allowed values) of both conventional and high-speed railways lines were satisfied. Based on the numerical analysis using the track model, it was analyzed that the results of the prediction of the track irregularity due to the excavation work and the level of the track deformation occurring at the actual site could be approximated as closely as possible. 본 연구는 도시철도 및 고속철도 선로를 근접하여 통과하는 신설 터널 시공현황 및 지반조건을 모사하고 레일, 침목 및 궤도의 탄성스프링으로 구성되는 궤도모델을 적용한 수치모델을 이용하여 3차원 정밀수치해석을 수행하였다. 철도시설물 인접굴착공사에 따른 기존 선로시설물의 궤도변형 안정성 검토를 수행한 결과, 대상 선로의 궤도틀림은 국내 궤도틀림 평가기준에 제시된 일반철도 및 고속철도의 평가기준(허용값)을 모두 만족하는 것으로 나타났다. 궤도모델이 적용된 수치해석을 바탕으로 굴착 공사에 따른 운행선 선로의 변형(궤도틀림) 예측 결과와 실제 현장에서 발생되는 궤도변형의 수준을 가급적 근사한 수준으로 모사할 수 있을 것으로 분석되었다.

내외부 3층 피복 수지파형강관의 현장적용성에 관한 실험적 연구

정지승,손태정 한국복합신소재구조학회 2018 복합신소재구조학회논문집 Vol.9 No.1

As the corrugated steel pipes has many advantages to compensate for the shortcomings of the concrete fume pipes, it has been widely used for culverts and drain trenches. However, when corrugated steel pipes used as a sewage pipe or in an environment exposed to sea water, corrosion can cause problems and degradation of the function of pipe. So, Composite Corrugated Steel Pipe(CCSP) coated with three layers were developed to compensate for the shortcomings and improve performance of corrugated steel pipes. The composite material used in fabrication of the CCSP consists of a three layer polymer protective coating on both sides of a steel sheet core. To verify the field application of the CCSP, a test was conducted on the resistance of the strain, stability of connections, water flow performance and durability to determine whether they meet KS quality and various design standards.

계층의사분석 기법을 적용한 도심지 공동구 타당성 평가모델 연구

정지승,나귀태,Chung, Jee-Seung,Na, Gwi-Tae 한국터널지하공간학회 2018 한국터널지하공간학회논문집 Vol.20 No.1

The urban center of a large city has a high concentration ratio of population, commerce, and traffic. Therefore, the expected effect is high from the introduction of the urban utility tunnel and it also has sufficient economic feasibility considering life cycle cost. Moreover, the construction cost can be greatly reduced if it is included in a large underground development such as a subway or a complex transfer center construction. However, it is not reflected in actual underground development plan. When planning a urban utility tunnel in Korea, it is expected to have difficulties such as the cost of relocation of the existing Life-Line, conflicts among the individual facility institutions, procurement of construction resources and sharing. Furthermore, it is possible to promote the project only if a consensus is drawn up by a collective council composed of all facilities and project developers. Therefore, an optimal alternative should be proposed using economic analysis and feasibility assessment system. In this study, the analytic hierarchy process (AHP) is performed considering the characteristics of urban areas and the importance of each indicator is quantified. As a result, we can support reasonable design capacity optimization using the feasibility assessment system. 국내 대도시의 도심은 인구, 상업, 교통 등의 집중도가 높으므로 공동구 도입에 따른 기대효과가 높고 생애주기비용을 고려한 경제적 타당성을 충분히 확보하고 있다. 더욱이 지하철, 복합환승센터 등과 같은 대규모 지하공간 개발에 포함하여 설치할 경우 초기 건설비용을 획기적으로 줄일 수 있으나 실제 지하개발 계획에 구체적으로 반영되지 못하고 있다. 국내에서 도심지 공동구를 새로이 계획할 경우 기존 Life-Line의 이설비용, 수용 기관별 의견충돌, 건설재원 조달 및 분담 등의 어려움이 예상되며 더욱이 모든 수용기관과 사업시행자로 구성된 공동구 협의회에서 합의를 도출해야만 사업추진이 가능하기 때문에 경제성 분석과 더불어 타당성 평가 시스템을 통한 합리적 의사결정 과정을 통해서 최적 대안이 제시되어야만 원활한 사업추진이 가능하다. 그러므로 도심지 유형별 특성을 고려해서 평가지표와 의사결정 계층구조를 재구성하고 계층의사분석(AHP) 기법을 적용해서 항목별 중요도를 정량화함으로써 타당성 평가시스템을 이용한 합리적인 설계용량 최적화를 지원할 수 있을 것으로 판단된다.

유지관리 자료를 이용한 국도 시설물의 생애주기비용분석

정지승,김익현,김문석 한국구조물진단유지관리학회 2002 한국구조물진단학회 학술발표회논문집 Vol.- No.-

디지털 관광주민증 사업의 역할과 향후 과제

정지승 한국문화관광연구원 2023 한국관광정책 Vol.- No.92

PSC 박스거더교 정착부의 최소파열력에 대한 강선긴장순서

정지승,구형선 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 논문집 Vol.5 No.2

반발경도법을 이용한 침목플로팅 궤도의 콘크리트 침목 강도추정 기법 연구

정지승,이정숙,최정열 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.3

본 연구의 대상궤도구조인 침목플로팅궤도(STEDEF)는 상대적으로 얇은 콘크리트 침목(RC Block) 하부에 매 우 소프트한 방진패드가 설치되어 있는 궤도형식으로서 방진패드가 콘크리트 강도 추정결과에 영향을 미칠 수 있을 것으로 예상되었다. 이에 본 연구에서는 일반적인 토목구조물의 콘크리트 압축강도 추정기법인 반발경도시험법을 철 도 궤도의 콘크리트 침목에 적용하기 위한 현장 적용성 평가를 수행하였다. 본 연구에서는 일반적인 토목구조물과 다 른 궤도구조의 특성이 반영된 콘크리트 침목의 강도추정기법을 분석하고자 공용중인 콘크리트 침목의 강도추정결과 에 영향을 미칠 수 있는 매개변수 실험을 수행하였다. 연구결과, 콘크리트 침목의 단면형상을 고려한 적정 타격위치 를 제시하였으며, 콘크리트 침목의 상태와 지지조건에 따른 강도추정결과의 차이를 도출하였다. The sleeper floating track (STEDEF) in this study was a track type in which a very soft resilience pad was installed under a relatively thin concrete sleeper (RC Block). Therefore it was expected that the resilience pad could affect the estimation results of the concrete strength. In this study, field applicability evaluation was performed to apply the rebound hardness test method, which was a general method for estimating the compressive strength of concrete in civil structures, to concrete sleepers of railway tracks. In order to analyze the strength estimation technique of concrete sleepers reflecting the characteristics of track structures different from those of civil structures, the parameter experiments that could affect the strength estimation results of concrete sleepers in a serviced line were performed. As a result of the study, the appropriate hitting position was suggested considering the shape of the concrete sleeper, and the difference in strength estimation results according to the condition of the concrete sleeper and supporting conditions was derived.

보이차 젤리의 품질특성 및 항산화 효과

정지승,정하숙 한국식품조리과학회 2017 한국식품조리과학회지 Vol.33 No.6

Purpose: The aim of our study was to investigate the quality characteristics and antioxidant activities of pu-erh tea jellies. Methods: Jellies were prepared with different amounts of pu-erh tea (0, 5, 10, 20, and 40%). The pH, sugar content, color, hardness,total phenol compounds, anti-oxidative activities, and sensory properties of pu-erh tea jellies were determined. Results: As a result, the pH, sugar content, and hardness of pu-erh tea jellies were significantly reduced with increasing levels of pu-erh tea (p<0.05). For color values, as the content of pu-erh tea increased, L-values of the jellies significantly decreased while a- and b-values significantly increased (p<0.05). Total phenolic compounds and anti-oxidative activities increased with increasing concentration of pu-erh tea (p<0.05). Sensory properties in terms of color, flavor, bitterness, chewiness, and overall preference showed the highest scores in jelly with 20% pu-erh tea. Conclusion: In conclusion, jelly with 20% pu-erh tea is recommended to take advantage of its functional properties with consumer acceptability.

Multi-Objective and Multi-Level Optimization for Orthotropic Bridges

정지승,조효남,이두화,민대홍 대한토목학회 1999 대한토목학회 학술발표회 논문집 Vol.1999 No.1