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      • KCI등재

        연직배수재 타설 후 장기간 경과된 지반의 통수성능

        정상국 한국지반신소재학회 2018 한국지반신소재학회 논문집 Vol.17 No.4

        Typically, soft clay improvement is carried out using installation of PVD and surcharge method. According to circumstances, installed PVD has left for a long time due to the change in construction schedule. Therefore, for simulation of this kind of condition, discharge capacity tests were carried out under a series of temperature condition (30, 35, 40°C). The results indicated that under water confinement, the discharge capacities significantly reduced with elapsed time. And, the empirical equation by Miura and Chai (2000) was used for estimating the long-term in-clay discharge capacity. Based on the test results, it is recommended that in term of long-term discharge capacity, Miura and Chai’s equation and reliability evaluation using discharge capacity tests under a series of temperature condition may be used. 연약점토 지반 개량을 위해 연직배수재 타설 후 선행재하공법이 일반적으로 적용되는데, 현장에서의 시공계획 변경 등으로인해 연직배수재 타설 후 장기간 방치되는 경우가 종종 발생된다. 따라서 장기간 방치된 조건에서의 연직배수재 열화 현상을고려하기 위해 구속압으로 적용되는 수온을 각각 30, 35, 40°C를 적용하였다. 그 결과, 시간경과에 따라 배수성능이 급격히저하되는 경향을 나타냈다. 그리고 현장 원위치 조건, 즉, 점토 구속조건하에서 장기간 통수능 저하 정도를 평가하기 위하여Miura와 Chai(2000)식을 적용하였다. 그 결과, 온도 변화 조건에서 수행된 통수능 시험결과를 이용한 신뢰성 해석 방법과Miura와 chai(2000)식을 적용하여 장기 통수능을 평가할 수 있는 것으로 평가되었다.

      • KCI등재후보

        새만금 준설모래의 비배수 거동

        정상국,강권수,양재혁 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 논문집 Vol.6 No.1

        The results of an experimental study on Saemangeum dredged sands are presented. Undrained triaxial compression tests were performed with three different initial relative densities, namely 18, 34, and 50%, intend to evaluate undrained behavior. All undrained triaxial compression tests were performed under static loading conditions. Undrained triaxial compression tests were exhibited complete static liquefaction, zero effective confining pressure and zero stress difference at lower confining pressures. As confining pressures were increased, the effective stress paths indicated increasing resistance to static liquefaction by showing increasing dilatant tendencies. The isotropic consolidation before shearing was identified as the likely cause of this behavior. The fines and larger particles create a particle structure with high compressibility at lower confining pressures. The effect of increasing the relative density was to increase the resistance of the sand against static liquefaction by making the sand more dilatant.

      • SCOPUSKCI등재

        전기습윤 현상에서의 선장력과 전기 이중층의 영향에 대한 해석

        정상국,강관형,이정묵,강인석,Chung, Sang-Kug,Kang, Kwan-Hyoung,Lee, Choung-Mook,Kang, In-Seok 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7

        The Lippmann-Young equation has been widely used in electrowetting to predict the contact-angle change of a droplet on a insulating substrate with respect to the externally-applied electrical voltage. The Lippmann-Young equation is derived by assuming a droplet as a perfect conductor, so that the effect of the electrical double layer and the line tension are not taken into account. The validity of the assumption has never been checked before, systematically. In the present investigation, a modified Lippmann-Young equation is derived taking into account of the effect of the electrical double layer and the line tension. To assess their influence on contact-angle change in electrowetting, the electrostatic field around the three-phase contact line is analyzed by solving the Poisson-Boltzmann equation numerically. The validity of the numerical methods is verified by using the past theoretical results on the electrostatic field around a wedge-shaped geometry, which shows fairly good agreement. The results of the present investigation clearly indicate that the effect of the electrical double layer and the line tension is negligible for a millimeter-sized droplet. On the other hand, for a micron-sized droplet, the effect of the line tension can become a dominating factor which controls the contact-angle change in electrowetting.

      • KCI등재

        제방축조재료의 응력-변형거동 예측을 위한 실내시험 및 수치해석

        정상국,구자갑 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.6

        본 연구에서는 제방 축조재료로 사용되는 낙동강 모래의 응력-변형 거동특성 파악을 위하여, 삼축압축시험 등을 포함한 실내시험을 실시하였고, 조립재료의 거동 표현에 적합한 개별요소방법을 적용한 수치 모델링을 실시하였다. 개별요소해석은 삼축압축시험 과정을 모델링하였으며, 이때 이용된 미시물성치는 물성치 보정과정을 통해 산정되었다. 특정 구속압조건을 만족시키는 미시 물성치의 산정이 가능하다면, 이 미시물성치의 이용을 통해 다른 구속압조건 및 응력재하 조건에서의 거동예측에 있어, 개별요소방법이 매우 효과적으로 이용될 수 있음을 알 수 있었다. The evaluation of the mechanical properties and behavior is very important for the design of embankment using granular materials. In this research, the lab. tests with Nak-dong river sand were conducted to find out mechanical properties related to stress-strain behavior. Also, numerical simulations which can express the behavior of granular material were conducted by distinct element method. Distinct element method can play a import role to predict stress-strain behavior for different confining stress and loading condition if micro-parameters can be estimated in specific condition.

      • 地下掘鑿時 隣接地盤의 沈下豫測

        정상국,심태섭,이재윤 朝鮮大學校 建設技術硏究所 2000 建設技術硏究 Vol.20 No.1

        This analysis of some empirical equations as well as measured value was carried out for comparison between instrumental valve attained at the site excavation in urban area in korea. And the follow come to conclusion that : 1) On comparing each other among themselves was estimated by FEM 8.54cm. Peck 21cm. Clough 6cm, Fry 16cm moreover actual values were measured with 12.23cm and the differentiation of each other was some appeared. 2) On comparisons horizontal displacement appeared by excavation with FEM was showed maximum horizontal displacement at depth 8m and the FEN showed some more than actual value. 3) In result, the clough method was controlled by displacement with carrying out excavation also excavation depth of 0.28 percent easily.

      • ATM 망용 우선순위제어 알고리즘의 개선에 관한 연구

        정상국,진용옥 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.2

        This paper proposes Double queue threshold QLT(Queue Length Threshold) algorithm and Hysteresis effect QLT algorithm. as being DPS(Dynamic Priority Scheduling) techniques. in order to advance the processing of multiple class traffics. Also, the performance of the proposed algorithms is analyzed through computer simulations,and the priority scheduling is analyzed using a retrial queue with two types of calls. Our simulation results show that the performance of the proposed Double queue length threshold QLT algorithm is superior to that of the conventinal QLT algorithm for 2 or more classes delay sensitive traffics. Also we find that Hysteresis effecT QLT algorithm is better mechanism than that of the existing QLT for real time and non-real time traffics.

      • KCI등재

        ATM망에서 다중등급 통화유량 처리를 위한 동적 우선순위 스케쥴링에 관한 연구

        정상국,진용옥 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.2

        본 논문은 다중등급의 통화유량에 대해 효율적인 처리를 위하여 동적 우선순위 스케쥴링이 가능한 2중이완성 한계치를 갖는 최소이완성한계 (Minimum Laxity Threshold:MLT)알고리즘과 2중 대기행열 한계치를 갖는 대기 행열간격한계(Queue Length Threshold QLT) 알고리즘을 제안하였다. 그리고 제안한 알고리즘의 성능을 컴퓨터 시뮬레이션을 통하여 분석하였다. 시뮬레이션 결과, 실시간서비스 중 지연민감도가 다른 2개 등급 이상의 통화유량 처리시2중 이완성 한계치를 갖는 MLT알고리즘을 적용함으로써 MLT알고리즘 자체보다 처리 효율성이 개선됨을 확인하고, 또2개 등급 이상의 비실시간 통화유량에 대해서는 2중 대기행열 한계치를 갖는 QLT알고리즘이 QLT보다 우수함을 알 수 있었다. In this paper, double laxity threshold MLT(Minimum Laxity Threshold) algorithm and double queue threshold QLT(Queue Length Threshold) algorithm are proposed as DPS(Dynamic Priority Scheduling) techniques for advanced processing of multiple class traffics. Also, the performance of the proposed algorithms is analyzed by a computer simulation. According to the simulation results, it can be shown that the proposed double laxity threshold ML T algorithm advances the processing performance versus ML T algorithm for 2 or more classes delay sensitive traffics, and that double queue length threshold QL T algorithm provides more efficient performance than QL T for 2 or more classes of non real time traffics.

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