Search Results - "Yoon, Heesung"

A comparative study of artificial neural networks and support vector machines for predicting groundwater levels in a coastal aquifer by Yoon, Heesung, Jun, Seong-Chun, Hyun, Yunjung, Bae, Gwang-Ok, Lee, Kang-Kun

“…► We compare ANN and SVM for groundwater level fluctuations in a coastal aquifer. ► The past groundwater level is the most effective input variable. ► Tide…”
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A method to improve the stability and accuracy of ANN- and SVM-based time series models for long-term groundwater level predictions by Yoon, Heesung, Hyun, Yunjung, Ha, Kyoochul, Lee, Kang-Kun, Kim, Gyoo-Bum

“…The prediction of long-term groundwater level fluctuations is necessary to effectively manage groundwater resources and to assess the effects of changes in…”
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Temporal variability of nitrate concentration in groundwater affected by intensive agricultural activities in a rural area of Hongseong, South Korea by Ki, Min-Gyu, Koh, Dong-Chan, Yoon, Heesung, Kim, Hyun-su

“…Nitrate in groundwater from alluvial and weathered granitic aquifers was monitored for 1–1.5 years on a monthly basis in an agricultural area with a high…”
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Monitoring and management of coastal aquifers by Masetti, Marco, Yoon, Heesung

“…This Special Thematic Issue of Italian Journal of Groundwater (Acque Sotterranee) is a collection of contributions from Authors and Participants to the South…”
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Submarine groundwater discharge revealed by aerial thermal infrared imagery: a case study on Jeju Island, Korea by Lee, Eunhee, Kang, Ki-mook, Hyun, Sung Pil, Lee, Kil-Yong, Yoon, Heesung, Kim, Seung Hee, Kim, Yongcheol, Xu, Zhen, Kim, Duk-jin, Koh, Dong-Chan, Ha, Kyoochul

“…Submarine groundwater discharge (SGD) is a global phenomenon that carries large volumes of groundwater and dissolved chemical species such as nutrient, metals,…”
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Freshwater-salt water interface dynamics during pumping tests by Kim, Yongcheol, Yoon, Heesung, Lee, Soo-Hyung

“…Freshwater-salt water interface (FSI) location is very important information for decision maker in managing coastal aquifer system, however, its temporal…”
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Convergence Stabilization of E&S Vector Hysteresis Model Incorporated With Finite Element Analysis of Electrical Machines by Yoon, Heesung, Zhang, Yanli, Koh, ChangSeop

“…This paper presents a convergence stabilization method of E&S vector hysteresis model when it is combined with nonlinear finite element analysis (FEA). In…”
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Influence of the range of data on the performance of ANN- and SVM- based time series models for reproducing groundwater level observations by Yoon, Heesung, Kim, Yongcheol, Lee, Soo-Hyoung, Ha, Kyoochul

“…In the present study, we designed time series models for predicting groundwater level fluctuations using an artificial neural network (ANN) and a support…”
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A preliminary geophysical analysis of gravity time-variation in Daejeon by Na, Sung-Ho, Ha, Kyoochul, Moon, Sang-Ho, Yoon, Heesung, Lee, Bong-Joo, Hwang, Seho, Shin, Young Hong, Lim, Mutaek, Park, Yeong-Sue

“…A gravity time series slightly longer than a month acquired by using a Burris gravimeter at Daejeon, Korea has been analyzed. After removal of linear drift of…”
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Predicting long-term change of groundwater level with regional climate model in South Korea by Jang, Seong, Hamm, Se-Yeong, Yoon, Heesung, Kim, Gyoo-Bum, Park, Jae-Hyun, Kim, MoonSu

“…Global climate change causes a high variability in precipitation and surface temperature increase in the world. Global climate models (GCMs) are effectively…”
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Hydrogeologic and Paleo-Geographic Characteristics of Riverside Alluvium at an Artificial Recharge Site in Korea by Lee, Soo-Hyoung, Hamm, Se-Yeong, Ha, Kyoochul, Kim, YongCheol, Koh, Dong-Chan, Yoon, Heesung, Kim, Sung-Wook

“…This study showed the hydrogeological characteristics of an alluvial aquifer that is composed of sand, silt, and clay layers in a small domain. It can be…”
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Characterizing the Impact of River Barrage Construction on Stream-Aquifer Interactions, Korea by Oh, Yun-Yeong, Hamm, Se-Yeong, Ha, Kyoochul, Yoon, Heesung, Chung, Il-Moon

“…This study investigated changes in stream-aquifer interactions during the period shortly after the construction of the Changnyeong-Haman River barrage (CHRB)…”
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Using artificial neural network models for groundwater level forecasting and assessment of the relative impacts of influencing factors by Lee, Sanghoon, Lee, Kang-Kun, Yoon, Heesung

“…Change in groundwater level is predicted for a special site where transient natural factors affecting the groundwater level are mixed with very irregular…”
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Interface engineering of yttrium stabilized zirconia/gadolinium doped ceria bi-layer electrolyte solid oxide fuel cell for boosting electrochemical performance by Jang, Inyoung, Kim, Sungmin, Kim, Chanho, Lee, Hyungjun, Yoon, Heesung, Song, Taeseup, Paik, Ungyu

“…La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is a promising cathode material for solid oxide fuel cells due to its high oxygen reduction reaction (ORR) activity. A…”
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Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells by Kim, Chanho, Park, Hyunjung, Jang, Inyoung, Kim, Sungmin, Kim, Kijung, Yoon, Heesung, Paik, Ungyu

“…Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to…”
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Facile fabrication strategy of highly dense gadolinium-doped ceria/yttria-stabilized zirconia bilayer electrolyte via cold isostatic pressing for low temperature solid oxide fuel cells by Kim, Chanho, Kim, Sungmin, Jang, Inyoung, Yoon, Heesung, Song, Taeseup, Paik, Ungyu

“…Gadolinium-doped ceria/yttria-stabilized zirconia bilayer electrolytes have received significant attention for use in solid oxide fuel cells since this…”
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Subcontinuous 2D La0.6Sr0.4CoO3-δ nanosheet as an efficient charge conductor for boosting the cathodic activity of solid oxide fuel cells by Kim, Chanho, Lee, Hyungjun, Jang, Inyoung, Kim, Sungmin, Yoon, Heesung, Paik, Ungyu, Song, Taeseup

“…•2D LSC perovskite nanosheet structure enhance the electrochemical performance.•2D networking enables the extension of charge transfer to the bulk region.•Low…”
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Enhancement of oxygen reduction reaction through coating a nano-web-structured La0.6Sr0.4Co0.2Fe0.8O3-δ thin-film as a cathode/electrolyte interfacial layer for lowering the operating temperature of solid oxide fuel cells by Jang, Inyoung, Kim, Sungmin, Kim, Chanho, Yoon, Heesung, Song, Taeseup

“…Lowering operation temperature of the solid oxide fuel cell is critical to improving its reliability and durability. However, the tradeoff between the…”
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Fabrication of thin films on an anode support with surface modification for high-efficiency intermediate-temperature solid oxide fuel cells via a dip-coating method by Jang, Inyoung, Kim, Chanho, Kim, Sungmin, Yoon, Heesung

“…[Display omitted] We studied the surface morphology of a modified anode structure that is capable of increasing the triple phase boundary (TPB) and the effect…”
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Enhanced reliability of planar-type solid oxide fuel cell stack incorporating leakage gas induction channels by Kim, Sungmin, Jang, Inyoung, Kim, Chanho, Lee, Hyungjun, Song, Taeseup, Yoon, Heesung, Paik, Ungyu

“…Planar type solid oxide fuel cell stacks have been studied for use as commercial products because of their high energy density and environment-friendly…”
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