Development and Application of Pipeline Network Optimization Simulator

성원모,권오광,이정환,허대기,Sung Won-Mo,Kwon Oh-kwang,Lee Chung-Hwan,Huh Dae-ki, 한국가스학회 1997 한국가스학회지 Vol.1 No.1

본 연구에서는 실제현장에 활용할 수 있는 가스파이프라인 네트워크의 최적화 모델을 개발하기 위해 먼저 구조 설계에 있어서 네트워크 알고리즘 중 MCST(Minimum Cost Spanning Tree) 알고리즘을 도입하여 전반적인 구조를 결정하고, 기존 방법의 단점을 보완하기 위해 Constrained Derivative 방법을 적용하였다. 또한 모델 개발 시, 압축기$\cdot$밸브등의 갑작스런 운전상태의 변화와 파이프의 파열 둥으로 인한 유동저해 현상을 예측할 수 있는 파이프라인 해석모델과 연계할 수 있도록 고려하여 설계하였다. 각 절점과 간선간의 압력 및 유량, 즉 파이프라인 배관망에서 필요한 수요량을 적절히 공급할 수 있는 파이프라인 망의 직경과 길이를 최소의 비용으로 결정하는 복합형 파이프라인 네트워크 최적설계 모델을 개발하였다 개발된 모델을 전형적인 천연가스 파이프라인 네트워크에 적용하여 최적설계를 수행한 결과, 보다 작은 파이프 직경과 낮은 절점 압력으로도 각 절점에서의 수요량을 공급할 수 있도록 설계할 수 있었으며, 원래의 시스템과 비교하여 약 $40\%$정도의 비용 절감효과를 볼 수 있었다. 또한, 기존의 국내 수도권 배관망에 대해 본 모델을 적용하여 새로운 설계모형을 제안함으로써 초기설계나 향우 추가 확장되는 부분의 배관망에 대해서도 경제성을 고려하여 최소비용의 네트워크 구성을 할 수 있음을 확인하였다. This paper presents a hybrid network model(HY-PIPENET) implementing a minimum cost spanning tree(MCST) network algorithm to be able to determine optimum path and constrained derivative(CD) method to select optimum Pipe diameter. The HY-PIPENET has been validated with the published data of 6-node/7-pipe network. Networking system and also this system has been optimized with MCST-CD method. As a result, it was found that the gas can be sufficiently supplied at the lower pressure with the smaller diameters of pipe compared to the original system in 6-node/7-pipe network. Hence, the construction cost was reduced about $40\%$ in the optimized system. The hybrid networking model has been also applied to a complicated domestic gas pipeline network in metropolitan area, Korea. In this simulation, parametric study was peformed to understand the role of each individual parameter such as source pressure, flow rate, and pipe diameter on the optimized network. From the results of these simulations, we have proposed the optimized network as tree-type structure with optimum pipe diameter and source pressure in metropolitan area, Korea, however, this proposed system does not consider the environmental problems or safety concerns.

파이프라인 네트워킹 최적화 모델의 개발 및 활용

성원모(Won-Mo Sung),권오광(Oh-Kwang Kwon),이정환(Chung-Hwan Lee),허대기(Dae-Ki, Huh) 한국가스학회 1997 한국가스학회지 Vol.1 No.1

전도체 형성 방법에 따른 유무기 복합재료 안테나의 고주파 특성

박상훈,성원모,Park, Sang-Hoon,Seong, Won-Mo 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9

Antennas were fabricated by physical(adhesive) and chemical(deposition+plating) method on organic-inorganic composite material. And antennas were measured dielectric constant and gain. Dielectric constant of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness and number of conduction material composition. But antennas were fabricated by chemical method was reached to 90 % of dielectric material. Gain of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness. But they were unrelated with conduction material composition. The other side antennas were fabricated by chemical method excelled more 0.8 dBic than antennas were fabricated by physical method in gain of antenna. Finally, chemical method can expect excellent product process because it can produce smaller size, higher gain and elimination of many handworks.

수정된 Kriging법을 응용한 다목적지구통계모델의 개발 및 타당성 검토

김인기,성원모,정문영,Kim, In-Kee,Sung, Won-Mo,Jung, Moon-Young 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.2

In modem petroleum reservoir engineering, the characterization of reservoir heterogeneities is very important to accurately understand and predict reservoir production performance. Formation evaluation for the description of reservoir is generally conducted by performing the analysis of well logging, core testing, and well testing. However, the measured data points by well logging or core testing are in general very sparse and hence reservoir properties should be interpolated and extrapolated from measured points to uncharacterized areas. In assigning the data for the unknown points, simple averaging technique is not feasible as optimum estimation method since this method does not account the spatial relationship between the data points. The main goal of this work is to develop PC-version of multi-purpose geostatistical model in which several stages are systematically proceeded. In the development of model, the simulator employs a automatic selection of semivariogram function such as exponential or spherical model with the best values of $R^2$. The simulator also implements a special algorithm for the fitting of semivariogram function to experimental sernivariogram. The special algorithm such as trial and error scheme is devised since this method is much more reliable and stable than Gauss-Newton method. The simulator has been tested under stringent conditions and found to be stable. Finally, the validity and the applicability of the developed model have been studied against some existing actual field data.

흡착에 의한 석탄암체의 부피변화가 고려된 흡착모델 개선 및 부피변형률 예측

김상진(Sang-Jin Kim),성원모(Won-Mo Sung) 한국가스학회 2015 한국가스학회지 Vol.19 No.2

본 연구에서는 CBM의 1차 생산뿐 아니라 CO<SUB>2</SUB>나 N<SUB>2</SUB>주입을 통한 ECBM, 혹은 지중저장을 목적으로 석탄층에 CO<SUB>2</SUB>를 주입할 때 발생할 수 있는 암체의 부피변화 영향을 고려하여 기존의 Langmuir 흡착 관계식을 개선하였다. 본 모델의 검증을 위해 CO<SUB>2</SUB>나 CH<SUB>4</SUB>, N<SUB>2</SUB>의 단일성분 흡착실험 데이터에 기존 Langmuir 모델값과 본 모델의 결과값을 비교하였다. 그 결과, 기존 모델에서는 흡착용량이 큰 석탄일수록, 흡착친화도가 큰 가스일수록 실험값과 모델값 사이의 오차가 커지는 경향이 나타났지만 본 모델에서는 모든 조건에서 실험결과를 잘 묘사하였고 본 모델을 통해 예측한 부피변형률 역시 실험값과 유사함을 확인하였다. 이렇게 개선된 단일성분 흡착모델을 혼합가스의 흡착모델인 IAS 모델에 적용하여 부피변화가 고려된 IAS모델로 개선하였다. 그 결과 혼합가스에 대한 흡착거동 역시 기존 모델에 비해 정확도를 높였고 이는 Hall 등(1994)이 수행한 혼합가스의 흡착실험결과와의 매칭을 통해 확인하였다. We proposed the improved Langmuir adsorption relations considering volume change effect of coal matrix during primary production of CBM and Enhanced-CBM with injection of carbon dioxide or CCS in coalseam but also volumetric strain. To verify this model, experimental data of pure gas adsorption such as CO<SUB>2</SUB>, CH<SUB>4</SUB>, and N<SUB>2</SUB> on coals were used to compare conventional Langmuir model with this model. From the results, we obtained that the larger adsorption capacity of coal and the higher adsorption affinity of gas, the larger error occur with Langmuir model. Using this model, however, we found not only substantially better fit in all condition but also reasonable volumetric strain of the coal matrix. We also applied this volume modified pure gas adsorption model to the IAS model to describe gas adsorption and volumetric strain for mixed gas. This modified-IAS model fitting experimental data by Hall et al(1994) improved accuracy of mixed gas adsorption calculation compared with conventional model.

대종천유역 충적대수층의 수리성 분석 및 수위강하예측에 관한 연구

최재진,성원모,한정상,Choi, Jae-Jin,Sung, Won-Mo,Hahn, Jeong-Sang 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.4

The main goal of this paper is to determine hydraulic properties and to predict drawdown for the efficient and stable development of groundwater in the Daejong-Chun area, North of Kyungsang-Do. Based on geological survey and analysis of well logging data conducted in 1991, it is found that the type of aquifer of this area is considered to be an anisotropic unconfined aquifer with saturated thickness of 19.8 m. In order to characterize this aquifer pumping test was conducted, and the resulting drawdown data were utilized for the analysis by applying both type curve matching technique and semi-log straight line method. As a result, the average specific yield of this aquifer is estimated as 32.3%, and the average ratio of $K_H$ to $K_V$ is only 2.7, which means that gravitational effect is not significant factor for this type of aquifer. For the validation of the estimated hydraulic properties, the analytical model which was developed with Newton-Raphson iteration procedure in this study, was employed to generate the drawdown. And, the resulting drawdown was compared against actual drawdown data and it shows the excellent matches. The actual drawdown data for 9 hours of pumping were used for history matching purposes and relatively satisfactory matches were achieved in this match. Then, the model was run by using the tuned parameters that are obtained during history matching stage, and the drawdown was predicted for the next 30 years of pumping with $3,000m^3/day$ of constant pumping rate. Its result indicates that the drawdown was stabilized as 1.41 m from 20 days with $3,000m^3/day$ of constant pumping rate, which is the required amount of water to be safely supplied to this area.

Ag가 함유된 전도성 도료의 제조 조건에 따른 고주파 특성

박상훈,김정표,성원모,Park, Sang-Hoon,Kim, Jeong-Pyo,Seong, Won-Mo 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9

Dual band internal antennas were fabricated with Ag conducting paste of various preparation conditions and different print thickness by silk screen print. We have investigated microwave properties were compared Ag conducting paste antenna with copperplate antenna at 800 MHz and 1,800 MHz. Gain of Ag conducting paste antenna was improved when preparation conditions were the single size Ag particle, using dry type resin and high Ag containing percent. However, it was lower than that of copperplate antenna within $0.1\~2.0dBi$ at 800MHz. In addition, it was improved at 800MHz when thickness of Ag conducting paste was printed more than skin depth but it was held after critical print thickness. On the other hand, it was reached level of copperplate antenna at 1,800MHz.

고분자/유전체 복합재료의 유전 특성

이호일(Ho Il Lee),성원모(Won Mo Sung),박상훈(Sang Hun Park),윤호규(Ho Gyu Yoon) 한국산업융합학회 2006 한국산업응용학회 학술대회 논문집 Vol.- No.-

유전체인 BaTiO₃ 및 SrTiO₃와 가공성이 우수한 고분자 재료와의 복합재료를 제조하여, 유전체의 함량, 입자 크기, 계면 결합제 그리고 수지 종류에 따른 유전특성을 비교하였다. 유전체 함량이 증가하고 입자크기가 작을수록 유전성질은 증가하였고, 계면 결합제의 영향으로 배향 분극이 쉽게 일어나면 유전성질이 증가함을 확인하였다. 기저수지의 구조가 대칭이면서 분자량이 작으면 유전 성질이 감소함을 알 수 있었다. 그러므로 열가소성수지인 polyphenyleneoxide와 열경화성수지인 triallyl isocyanurate를 혼합한 복합재는 Interpenetrating network 구조를 형성하여 손실을 감소시킬 수 있었다.

에너지/환경 : 다중공 평판형 셀기기에서 하이드레이트 생산실험 분석연구

배재유 ( Jae Yu Bae ),성원모 ( Won Mo Sung ),권순일 ( Sun Il Kwon ) 한국화학공학회 2007 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.45 No.3

에너지/환경 : 고갈가스전에의 적정 가스저장시스템 분석을 위한 시뮬레이션 연구

이영수 ( Young Soo Lee ),최해원 ( Hae Won Choi ),이정환 ( Jeong Hwan Lee ),한정민 ( Jeong Min Han ),류상수 ( Sang Soo Ryou ),노정용 ( Jeong Yong Roh ),성원모 ( Won Mo Sung ) 한국화학공학회 2007 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.45 No.5