H.264/AVC를 위한 고속 블록 모드 결정 알고리즘에 관한 연구

허도근 ( Do Guen Huh ),김용욱 ( Yong Wook Kim ) 원광대학교 공업기술개발연구소 2004 工業技術開發硏究誌 Vol.24 No.-

관로, 관망 : 상수관망에서 관 마찰계수 보정을 위한 역부정류해석

유도근 ( Do Guen Yoo ),조문수 ( Moon Soo Cho ),백천우 ( Chun Woo Baek ),김중훈 ( Joong Hoon Kim ),김석현 ( Seok Hyeon Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2007 공동 추계학술발표회 Vol.2007 No.-

포스터 발표 : 관로, 관망 ; 상수관망에서 관 마찰계수 보정을 위한 역부정류해석

유도근 ( Do Guen Yoo ),조문수 ( Moon Soo Cho ),백천우 ( Chun Woo Baek ),김중훈 ( Joong Hoon Kim ),김석현 ( Seok Hyeon Kim ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-

알고리즘의 발달과정 및 전망

유도근(Do-Guen Yoo),김중훈(Joong-Hoon Kim) 대한토목학회 2015 대한토목학회지 Vol.63 No.8

Seismic Reliability-Based Multiobjective Design of Water Distribution System: Sensitivity Analysis

Yoo, Do Guen,Jung, Donghwi,Kang, Doosun,Kim, Joong Hoon American Society of Civil Engineers 2017 Journal of water resources planning and management Vol.143 No.2

<P>This study proposes a seismic reliability-based water distribution system (WDS) optimal design model that minimizes total cost and maximizes seismic reliability. Here, seismic reliability is defined as the ratio of the available quantity of water to the required demand under stochastic earthquake events. A new evaluation model is used to assess seismic reliability, while a multiobjective harmony search (MOHS) based on a ranking approach is used for optimization. The Anytown network was modified for the demonstration of the proposed method. First, this study performs the sensitivity analysis of MOHS parameter values [i.e.,harmony search consideration rate (HMCR) and pitch adjustment rate (PAR)] to identify the best parameter set in a pipe-sizing problem of an Anytown network. Then, Pareto optimal solutions with three different tank configurations are obtained and compared with respect to the final Pareto fronts and the system designs. For the sensitivity analysis, it reveals that higher PAR and lower HMCR values are also required to maintain high searchability in a multiobjective (MO) framework. In addition, Pareto-optimal solutions found for networks with tanks dominated those found for those without tanks. (C) 2016 American Society of Civil Engineers.</P>

Seismic Hazard Assessment Model for Urban Water Supply Networks

Yoo, Do Guen,Jung, Donghwi,Kang, Doosun,Kim, Joong Hoon,Lansey, Kevin American Society of Civil Engineers 2016 Journal of water resources planning and management Vol.142 No.2

<P>A new seismic reliability evaluation model is proposed that quantifies the impact of earthquakes on hydraulic behavior of water supply networks. Probabilistic seismic events are produced in the target areas, and the depth of earthquake failure is evaluated by seismic reliability indicators. The developed model was applied to several case studies and used for an intensive examination on how a water supply system hydraulically responds to a seismic event and what system characteristics influence the system's performance in the event of an earthquake. First, the system reliability of a real network in South Korea when subjected to earthquakes of various magnitudes and locations was quantified. Next, the reliabilities of full and simplified network models were evaluated to investigate how system layouts affect the reliability evaluation. Finally, networks with different configurations, pipe sizes, and system densities were compared with respect to the seismic reliability and various seismic damage indicators. (C) 2015 American Society of Civil Engineers.</P>

Optimal Pipe Size Design for Looped Irrigation Water Supply System Using Harmony Search: Saemangeum Project Area

Yoo, Do Guen,Lee, Ho Min,Sadollah, Ali,Kim, Joong Hoon Hindawi Publishing Corporation 2015 The Scientific World Journal Vol.2015 No.-

<P>Water supply systems are mainly classified into branched and looped network systems. The main difference between these two systems is that, in a branched network system, the flow within each pipe is a known value, whereas in a looped network system, the flow in each pipe is considered an unknown value. Therefore, an analysis of a looped network system is a more complex task. This study aims to develop a technique for estimating the optimal pipe diameter for a looped agricultural irrigation water supply system using a harmony search algorithm, which is an optimization technique. This study mainly serves two purposes. The first is to develop an algorithm and a program for estimating a cost-effective pipe diameter for agricultural irrigation water supply systems using optimization techniques. The second is to validate the developed program by applying the proposed optimized cost-effective pipe diameter to an actual study region (Saemangeum project area, zone 6). The results suggest that the optimal design program, which applies an optimization theory and enhances user convenience, can be effectively applied for the real systems of a looped agricultural irrigation water supply.</P>

상수관망 지진재해 신뢰성 모형의 민감도 분석

유도근(Yoo, Do Guen),강두선(Kang, Doosun),박무종(Park, Moojong),주진걸(Joo, Jin Gul) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.1

본 연구에서는 상수관망 지진재해신뢰성 산정 모형인 REVAS.NET(Reliability EVAluation model of Seismic hazard for water supply NETworks)에 사용되는 주요 매개변수에 대한 민감도 분석을 수행하였다. 이를 위하여 불확실성을 갖는 주요 매개변수를 1) 몬테카를로시뮬레이션의 횟수, 2) 배수지 취약도, 3) 관로 취약도, 그리고 4) 누수발생시 누수공의 면적으로 선정하고, 매개변수의 변동에 의한 지진재해 신뢰성의 변화를 분석하였다. 그 결과, 적정 몬테카를로 시뮬레이션 횟수는 불확실성을 갖는 매개변수의 개수에 의해 달라지는 것을 확인할 수 있었으며, 배수지 및 관로의 취약도, 그리고 누수공 면적의 불확실성에 따라 지진재해 신뢰성의 불확실성이 6~16%까지 변동될 수 있음을 확인하였다. 본 연구를 통해 REVAS.NET 모형의 불확실성에 의한 결과를 사전에 예측할 수 있었으며, 그 결과가 향후 지진재해에 대비한 사전 보강 및 복구전략을 수립하는데 도움이될 수 있을 것이라 판단된다 In this study, the sensitivity analysis of representative parameters in REVAS.NET(Reliability EVAluation model of Seismic hazard for water supply NETworks) model is performed. The four main parameters 1) the number of Monte Carlo Simulations(MCS), 2) fragility of distributing reservoirs, 3) pipe fragility, and 4) opening area of leakage point are selected to quantify the uncertainty. The developed method in this study was applied to a real water pipeline system in J-city, Korea and the results were analyzed. As a results, the proper number of MCSs can be varied depending on the number uncertain parameters. In addition, the minimum and maximum rate of change in system serviceability(S s ) varied from 6~10%. Through this sensitivity analysis, the range of parameters’ inherent uncertainties can assess and predict quantitatively. The developed method can utilize to establish proactive measures and restoration plans against the seismic hazard in water supply systems.

상수관망 시스템의 위상구조특성에 따른 지진재해신뢰성 비교 연구

유도근(Yoo Do Guen),이정호(Lee Jung Ho) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.2

상수관망 시스템은 절점과 연결선으로 구성되는 대표적인 네트워크 중 하나이다. 이와 같은 네트워크 구조의 사회기반 시설물은 절점과 연결선 사이의 연결성에 따라 구조적 및 수리학적 성능이 다르게 나타난다. 본 연구에서는 상수관망의 위상구조특성과 지진재해에 의한 시스템 신뢰성 사이의 연관성을 규명하기 위한 기초연구를 수행하였다. 이를 위해, 상수관망의 8가지 구조적 특성인자를 선정하고, 이를 정량화하여 지진재해신뢰성 결과와 비교분석하였다. 지진재해신뢰성은 물공급시스템 전체에 대한 지진재해에 의한 수리학적, 구조적 신뢰성을 산정하는 모형인 REVAS.NET(Reliability EVAluation model of Seismic hazard for water supply NETwork)을 활용하였다. 제안된 평가인자와 지진재해신뢰성 정량화를 연결구조가 다른 동일 면적의 가상관망과 비슷한 규모의 공급면적을 가지는 실제관망지역을 설정하여 적용하였다. 그 결과, 지진 발생에 의한 신뢰도가 상수관망 시스템의 위상특성에 의해 경향성을 갖는 것을 확인하였다. 제안된 방법론은 설계, 시설개량, 복선화 등과 같이 지진재해 신뢰성을 재해 이전에 사전적으로 강화하기 위한 의사결정기준으로 활용이 가능할 것으로 판단된다. A water network system is one of the representative networks composed of nodes and links. The social infrastructure of such a network structure has different structural and hydraulic performance depending on the connection between the node and the links. In this study, a basic study was carried out to clarify the relationship between the topological structure characteristics of the water network and the system reliability by earthquake disaster. For this purpose, eight structural characteristics of the water network were selected, quantified and compared with the results of earthquake disaster reliability. The reliability of the earthquake disaster was measured using REVAS.NET (Reliability EVAluation model of Seismic hazard for water supply NETwork), which is a model for estimating the hydraulic and structural reliability. The proposed model was applied to the actual and hypothetical networks with the same area. As a result, it was confirmed that the reliability due to the earthquake occurrence has a tendency due to the topological characteristics. The proposed methodology can be used as a decision criterion for strengthening the reliability of earthquake disaster in advance such as design, improvement of facility, duplication lines.

상수관망 공급능 향상을 위한 제수밸브의 차폐구역을 고려한 다목적 최적설계

유도근(Yoo Do Guen),김경필(Kim Kyoung Pil),박무종(Park Moo Jong),주진걸(Joo Jin Gul) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.2

상수관망 시스템은 충분한 양의 용수를 적절한 수질과 수압으로 안정적으로 소비자에게 공급해야한다. 이를 만족하기 위해서는, 관로 사고 등과 같은 비정상상황에서도 신뢰도 인자 중 하나인 공급성을 충분히 발휘하기 위한 설계가 필요하다. 본 연구에서는 용수공급 안정화를 위한 연계관로 설계문제를 대상으로 관로 공사비를 최소화하는 동시에 관로 사고시에도 공급능이 최대화 될 수 있는 다목적 최적설계 모형을 개발하였다. 이를 위하여 공급능을 정량적으로 산정할 수 있는 신뢰도 인자중 하나인 부족량 기대치를 활용하였으며, 개별 관로의 파손을 해석할 시 실제 밸브 차단에 의해 발생되는 차폐구역인 세그먼트를 고려하여 보다 현실적인 결과를 도출하고자 하였다. 개발된 방법론을 두 개의 상수관망에 적용하여 그 결과를 분석하였다. 개발된 모형은 정상상황시의 최소수압 조건만을 고려하는 현재의 설계기법에 비하여, 비정상상황을 고려함에 따라 미래의 불확실성을 고려할 수 있다는 장점을 가지므로, 향후 다양한 설계인자의 도입시 기초방법론으로 고려할 수 있을 것으로 기대된다. The water supply system should provide a sufficient amount of water to the consumers with adequate water quality and pressure. In order to satisfy this requirement, it is necessary to design the hydraulic system to exhibit sufficient serviceability, which is one of the reliability, even in an abnormal situation such as a pipe accident. In this study, we developed a multi-objective optimal design model that minimizes pipeline construction cost and maximizes supply capacity in case of pipeline accident. To do this, we used the expected water shortage, which is one of the reliability factors that can quantitatively measure the supply serviceability. In analyzing process, segment and unintended isolation were considered to obtain more realistic results under abnormal conditions. The developed methodology was applied to two water networks and the results were analyzed. The developed model has the advantage of considering the uncertainty of the future in abnormal situation compared with the current design method considering only the minimum hydraulic pressure condition in normal situation.