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      • KCI등재

        강재로 구속된 프리스트레스트 콘크리트 합성거더의 정적 및 피로거동

        김정호,황윤국,이상윤,박경훈 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.6

        A new type of girder, called steel-confined prestressed concrete girder (SCP girder), has been developed, which maximizes the structural advantages of concrete, steel, and PS tendon, and improves on the shortcomings of steel plate girder, PSC I-girder, and preflex girder bridge for use in the construction of middle- or long-span bridges. To verify the propriety of design, structural safety, and applicability of this girder, a static load test was carried out (Kim et al.., 2002). Since the main damage typically sustained by steel bridges results from the fatigue caused by the repetition of traffic loads, fatigue safety must therefore be guaranteed in applying the SCP girder in the construction of real bridges. In this study, a fatigue test was carried out to investigate fatigue behavior and provide basic data for fatigue design. Based on the fatigue test, the fatigue safety of the girder was estimated. For the fatigue test, 10-m specimens were designed for a standard-design truckload (DB-24). A static load test was also performed before the fatigue test to analyze the structural behavior of the specimens. After the fatigue test, outer steel plates were removed to observe the condition of the concrete in the girder. 최근 국내에서 I형 거더의 외부가 강재로 이루어지고 내부에 무근콘크리트가 채워져 합성된 거더에 프리스트레스를 도입하여 경간 을 장대화할 수 있는 새로운 개념의 합성거더인 ‘강재로 구속된 프리스트레스트 콘크리트 합성거더(Steel-Confined Prestressed Concrete Girder; SCP Girder)'가 개발되었다. 또한 개발된 거더를 실물크기로 제작하여 시공성을 확인하고 정적하중 재하에 의한 파괴실험을 통해 공 용 중 안전성에 대한 실험적 검증이 수행되었다(김정호 등, 2002). 그러나 SCP 합성거더의 실용화를 위해서는 교량 파손의 주원인이 주행하중 의 영향에 의한 피로파손인 점을 고려하여 반복하중에 대한 피로거동의 연구 및 피로 안전성 확보가 요구된다. 따라서 본 연구에서는 SCP 합성 거더에 대한 피로거동 특성을 파악하고 피로설계를 위한 기초적인 자료를 제시하기 위해 피로실험을 실시하였다. 피로실험을 위한 시험체의 제 작은 1등교에 해당하는 설계활하중(DB-24)에 대하여 10m 지간으로 설계․제작하였으며, 실험결과 도로교설계기준(한국도로교통협회, 2000) 의 상세피로범주에 따른 허용피로응력범위를 초과하지 않는 것으로 나타났다. 또한 초기정적재하를 통해 설계의 타당성과 구조적 거동을 분석하 였으며, 피로실험 종료 후 거더 외부를 이루고 있는 강재를 제거하여 내부콘크리트의 상태를 관찰하였다.

      • KCI우수등재

        ATM/TDMA의 전송에서 부분타임스탬프 방식의 셀 지연변이 보상해석

        김정호(金正鎬) 한국산업응용수학회 2001 Journal of the Korean Society for Industrial and A Vol.5 No.1

        In order to economically achieve the rapid deployment of B-ISDN services which enable a variety of multimedia data processing in a short time, terrestrial/satellite-mixed network is being combined with terrestrial ATM network based on optical cable and satellite network which covers a widespread service range. This dissertation analyzes and investigates several previously existent CDV compensation methods in order to compensate CDV arising from interfacing satellite TDMA and ATM. Specifically to supplement the problems of timestamp and cell number counting methods, new Partial Timestamp method for CDV compensation is proposed. For timestamp optimization, the optimal timestamp condition that minimizes CDV, cell delay variation distribution length, is derived by making the use of the sum of the secondary moment. To evaluate the mechanism, Markov Modulated Poisson Process, which can express VBR service very well, is selected as a cell input traffic model of terrestrial transmitting earth station. After several simulation, it is confirmed that, when ut i 1 izing the proposed mechanism, CDV compensation capability for CBR services is the same as the other mechanism. It is also confirmed that CDV compensation capability for VBR services is very superior to the cell number count ing method. In this case, as the timestamp number Nts increases, CDV compensation capability increases, and the CDV distribution length is reduced.

      • 人性檢査를 利用한 MPDS 患者의 心理者 分析

        金正浩,曺圭澄 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1

        A research scale of 48 items selected from MMPI by McCall et al. was used to compare psychologic aspects of 80 patients with MPDS to control I subjects and control Ⅱ subjects. For this, study subjects were selected 80 patients of MPDS who visited the Dept. of Dentistry, K.N.U.H., from December in 1982 to september in 1983. Control Ⅰsubjects were selected 80 outpatients without MPDS who required dental treatment from December in 1982 to september in 1983. And control Ⅱ subjects were selected 80 persons without MPDS who required no dental treatment and lived in Taegu. The results were as follow: In study subjects, somatic group and behavioral group are markedly higher than control (Ⅰ,Ⅱ) subjects. In somatic group and behavioral group, there was no significant difference between control I subjects and control Ⅱ subjects In somatic group and behavioral group, there was no significant difference between male and female in each subjects. In study subjects, general nature somatic category was higher than head, neck, throat and GIT somatic category. (P<0.05) In study subjects, somatic group and behavioral group gradully increased according to increase in number of MPDS symptom.

      • ATM/TDMA의 전송에서 부분타임스탬프 방식의 셀 지연변이 보상해석

        김정호 한국산업정보응용수학회 2001 한국산업정보응용수학회 Vol.5 No.1

        In order to economically achieve the rapid deployment of B-ISDN services which enable a variety of multimedia data processing in a short time, terrestrial/satellite-mixed network is being combined with terrestrial ATM network based on optical cable and satellite network which covers a widespread service range. This dissertation analyzes and investigates several previously existent CDV compensation methods in order to compensate CDV arising from interfacing satellite TDMA and ATM. Specifically to supplement the problems of timestamp and cell number count ing methods, new Partial Timestamp method for CDV compensation is proposed. For timestamp optimization, the optimal timestamp condition that minimizes CDV, cell delay variation distribution length, is derived by making the use of the sum of the secondary moment. To evaluate the mechanism, Markov Modulated Poisson Process, which can express VBR service very well, is selected as a cell input traffic model of terrestrial transmitting earth station. After several simulation, it is confirmed that, when utilizing the proposed mechanism, CDV compensation capability for CBR services is the same as the other mechanisms. It is also confirmed that CDV compensation capability for VBR services is very superior to the cell number counting method. In this case, as the timestamp number Nts increases, CDV compensation capability increases, and the CDV distribution length is reduced.

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