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        • KCI등재

          순환골재와 쇄석을 이용한 연직배수재의 실내모형실험

          이달원,이정준,Lee, Dal-Won,Lee, Jeong-Jun 한국농공학회 2012 한국농공학회논문집 Vol.54 No.5

          In this study, the full-scale laboratory model test on utilization of recycled aggregates and crushed stone as vertical drains to use an alternative material of sand in soft ground is performed. The settlement and pore water pressure were measured to evaluate the discharge capacity and filed application, and the results were compared and analyzed through the finite element method. The measured and estimated settlement in all vertical drain materials decreases gradually with the load increase. The measured settlement 6.55~8.63 mm, and the estimated by the Hyperbolic model was 7.45~7.92 mm. So the model used for the analysis can be applied to the settlement estimation of the actual field. The variations of pore water pressure with time showed constantly regardless of the load in all vertical drainage materials. The pore water pressure was similarity to that of sand after rapid drawdown. Therefore, it was applicable to the field because discharge capacity was enough to be an alternative material to the sand which had been being used as the vertical drains.

        • KCI우수등재

          Estimation of Degree of Consolidation in Soft Ground Using Field Measurements and Rheology Model

          이달원,윤현정,Lee, Dal-Won,Yoon, Hyun-Jung The Korean Society of Agricultural Engineers 2005 한국농공학회논문집 Vol.47 No.2

          In this research, an attempt is made to derive the practical estimation of the degree of consolidation in soft clay from field measurements under embankments. For the practical estimation of pore water pressure in soft clay, the elasto-viscous rheological model was proposed, with a transform of parameters and a field geotechnical measurements in southern Korea. By using the rheological properties of soft clays and the dissipation of excess pore water pressure behaviour during step loading, a degree of consolidation or pore water pressure estimation in the future can be performed, and are shown to be generally close to the field measurements of pore water pressure. Finally, a pore water pressure behaviour in soft clay can be explained through measured data in field and the excess pore water pressure data can also be used to estimate settlement.

        • KCI등재

          Riprap으로 보강된 농업용 저수지 제체의 붕괴거동

          이달원,노재진,Lee, Dal Won,Noh, Jae Jin 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6

          In this study, the large scale test was performed to investigate the behavior of failure on the embankment and spillway transitional zone by overtopping. The pore water pressure, earth pressure, settlement and failure behaviors according to several reinforcing method were compared and analyzed. The pore water pressure showed a small change in the spillway transition zone and core, indicating that the riprap and geotextile efficiently reinforced the embankment, but non-reinforcement showed a largely change in pore water pressure. The earth pressure by riprap and geotextile at upstream slope and bottom core increased rapidly with the infiltration of the pore water by overtopping. And the earth pressure at crest showed a smally change due to effect of the inclined core. A settlement by riprap showed a small change and the geotextile decreased a rapidly due to failure of crest. The width of failure by riprap at intermediate stage (50 min) showed a largely due to sliding of crest. But, the width and depth of the seepage erosion after the intermediate overtopping period (100 min) were very small due to the effect of riprap than geotextile and non-reinforcement which delayed failure. It has the effect that protect reservoir embankment from erosion in the central part. The pore water pressure at the spillway transition zone due to overtopping increased a rapidly in the case of non-reinforcement, but the reinforced methods by geotextile and riprap showed a smally change. Therefore, the reinforced method by riprap and geotextile was a very effective method to protect permanently and the emergency an embankment due to overtopping, respectively.

        • KCI등재

          지오텍스타일로 보강된 농업용 저수지 제체의 붕괴거동

          이달원,노재진,Lee, Dal Won,Noh, Jae Jin 한국농공학회 2014 한국농공학회논문집 Vol.56 No.2

          In this study, the large scale test was performed to investigate the behavior of failure for the embankment and spillway transitional zone by overtopping. The pore water pressure, earth pressure, settlement and failure pattern of covering embankment with geotextile were compared and analyzed. The pore water pressure showed a small change in the spillway transition zone and core, indicating that the geotextile efficiently reinforced the embankment. The earth pressure decreased the infiltration of the pore water only in inclined cores type to secure local stability. The behavior of failure started from the bottom and gradually progressed upwards. After the intermediate overtopping period (100 min), width and depth of the seepage erosion were very small due to the effect of geotextile which delayed failure. Therefore, the reinforced method by geotxtile was a very effective method to respond to the emergency due to overtopping.

        • KCI등재

          농업 기반시설의 내진성능 평가기법 - 동적 수치해석 중심으로-

          이달원,김용성,Lee, Dal-Won,Kim, Yong-Seong 한국농공학회 2004 한국농공학회논문집 Vol.46 No.4

          The evaluation technique of seismic performance on agricultural infrastructure based on dynamic numerical simulations, which Included a cyclic elasto-plastic and a viscoelastic-viscoplastic constitutive model to actual multi-layered ground conditions during large earthquake were performed by a liquefaction analysis in the present study. From the liquefaction analysis, it was verified that the models can give a good description of the damping characteristics and liquefaction phenomena of ground accurately during large event which induces plastic deformation in large strain range.

        • KCI등재

          불포화토에서 공극비의 추정

          이달원,Lee Dal-Won 한국농공학회 2006 한국농공학회논문집 Vol.48 No.4

          This study was carried out to investigate the soil water characteristic curve and prediction of void ratio with net stress and matric suction using the linear elastic and volumetric deformation analysis method on unsaturated silty. The unsaturated soil tests were conducted using a modified oedometer cell and specimens were prepared at water content 2 times of liquid limit and required void ratio. The axis translation technique was used to create the desired matric suctions in the samples. It is shown that soil water characteristic curve and volumetric water content were affected significantly by preconsolidation pressure. As a matric suction increases, the reduction ratio of void ratio was shown to considerably small. Also, the predicted and measured void ratio for unsaturated soils using the linear elastic and volumetric deformation analysis showed good agreement as net stress and matric suction increases.

        • KCI등재

          농업용 저수지 둑 높이기에 따른 제체의 공극수압 거동

          이달원,이영학,Lee, Dal-Won,Lee, Young-Hak 한국농공학회 2012 한국농공학회논문집 Vol.54 No.3

          In this study, an experiment with large-scale model was performed according to raising embankment in order to investigate the cause of collapse by a change in water level of reservoir. Also, the settlement and pore water pressure by high water level and a rapid drawdown were compared and analyzed. After raising embankment for inclined core, there was no infiltration by leakage. For the vertical core, the pore water pressure showed a largely change by faster infiltration of pore water than in the inclined core. In a rapid drawdown, inclined core was remained stable but vertical core showed a largely change in pore water pressure. A settlement after a raising embankment showed a larger measure of settlement than before the raising embankment. The leakage quantity before a raising embankment and an inclined extension showed no leakage. Leakage in vertical extension was measured 160 $l$. From the result, a instrument system that can accurately estimate a change of pore water pressure shall be established for a rational maintenance and stabilization of raising embankment for agricultural reservoir.

        • KCI등재

          PF_Ring을 이용한 대용량 트래픽 처리 시스템

          이달원,고대식,김동환,최상용 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.2

          The advances in IoT (Internet of Things) and Big Data technologies have enabled various devices to work together, also causing the amount of traffic between systems to increase significantly. In these situations, real-time processing of large traffic is critical in order to effectively control the operational status, failure status, and security threat of the system and network. In this paper, a system using PF_Ring is proposed which is capable of extracting meaningful data from high-capacity traffic of 5Gbps in real-time. The proposed system installed PF_Ring in the Linux system kernel, periodically executed PF_Ring using the Collector Handler to collect traffic and read the data through Packet_preprocessor to operate in parallel. The experiment results have confirmed that the proposed system is able to fully handle the entire traffic within one minute, which is the next pre-processing cycle, with the loss rate of 0% in processing the 5Gbps collected packets and pre-processing time of approximately 47 seconds. 사물인터넷, 빅데이터 기술의 발전은 다양한 장비들이 상호 연결되어 작용하는 것을 가능하게 하였고, 이로 인하여 시스템 사이의 정보전달을 위한 트래픽 양 또한 대용량화 되어 가고 있다. 이러한 상황에서 시스템과 네트워크의 운영상태, 장애상태, 보안위협 등을 효과적으로 관제하기 위해서는 대용량 트래픽의 실시간 처리가 매우 중요하다. 본 논문에서는 5Gbps의 대용량 트래픽에서 의미 있는 데이터를 실시간으로 추출할 수 있는 PF_Ring을 이용한 시스템을 제안하였다. 제안된 시스템은 리눅스 시스템 커널에 PF_Ring을 설치하고, Collector Handler를 이용하여 PF_Ring을 주기적으로 실행하여 트래픽을 수집하고 Packet_preprocessor가 읽어 병렬처리 방식으로 동작하도록 설계하였다. 실험결과, 수집 패킷은 5Gbps를 처리하는데 손실률은 0%이었고 전처리 시간은 약 47초이기 때문에 제안된 시스템을 통하여 다음 전처리 주기인 1분 이전에 전체적인 트래픽을 완전하게 처리하고 있음이 확인되었다.

        • KCI등재

          수평 배수재로서 순환골재와 쇄석의 활용 방안

          이달원,임진혁,Lee, Dal-Won,Lim, Jin-Hyuk 한국농공학회 2010 한국농공학회논문집 Vol.52 No.6

          In this study, laboratory model test on utilization of recycled aggregates and crushed stone as horizontal drains to use alternative material of sand in soft ground is practiced. The coefficient of permeability of the recycled aggregates and crushed stone showed largely 1.2~5.1 times and 2.0~3.3 times greater than sand, respectively. The horizontal coefficient of permeability in case of installing the horizontal perforated drain pipe showed largely 1.9~6.8 times more than the case of not installing. The drainage distance showed 1.7~1.8 times greater than sand. When a degree of consolidation is 90 %, there is no delay of consolidation in SCP and PVD improvement sections. Therefore, it is proven that the field applicability is excellent. Also, the suitable quality management criterion is presented to make use of a horizontal drains in soft ground on the basis of analysis of the physical and environmental characteristics.

        • KCI등재

          연약지반상에 축조된 농업용저수지의 과잉공극수압 예측과 압밀계수의 비교

          이달원,김은호,Lee, Dal-Won,Kim, Eun-Ho 한국농공학회 2010 한국농공학회논문집 Vol.52 No.2

          This study was carried out to comparison of coefficient of consolidation and the prediction of excess pore water pressure in agricultural reservoir on soft clay ground. For the purpose of verification of the proposed equation, laboratory model tests and field tests were performed and excess pore water pressure was compared to those predicted with the Terzaghi's method. The predicted excess pore water pressure according to ponding was very applicable to practice because it was close to the observed data. Also, for the comparison of coefficient of consolidation, the oedometer, constant rate of strain (CRS), and Rowe cell tests were performed. The coefficient of consolidation at the Rowe cell and CRS tests showed a greate increase than in the oedometer test. The ratio of the vertical and horizontal coefficient of consolidation showed a large difference according to various tests method and mixing ratio. Therefore, it is recommended that careful attention should be paid to predicting the required consolidation period in agricultural reservoir.

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