Search results for: Dongwook Shin

Items from 1 to 20 out of 73 results

article

Analysis of hybrid discontinuous Galerkin methods for linearized Navier–Stokes equations

Dongwook Shin, Youngmok Jeon, Eun‐Jae Park

Numerical Methods for Partial Differential Equations > 39 > 1 > 304 - 328

In this article, we introduce and analyze arbitrary‐order, locally conservative hybrid discontinuous Galkerin methods for linearized Navier–Stokes equations. The unknowns of the global system are reduced to trace variables on the skeleton of a triangulation and the average of pressure on each cell via embedded static condensation. We prove that the lifting operator associated with trace variables...

article

National cancer screening program for gastric cancer in Korea: Nationwide treatment benefit and cost

Yun‐Suhk Suh, Joonki Lee, Hyeongtaek Woo, Dongwook Shin, more

Cancer > 126 > 9 > 1929 - 1939

Background The purpose of this study was to evaluate the nationwide benefit and cost of the national cancer screening program (NCSP) for gastric cancer treatment. Methods For this nationwide, population‐based study, the Korean National Health Insurance Big Data Base, which included gastric cancer–related treatment information and the costs for all patients with gastric cancer who were 40 years...

article

Importance of mixing protocol for enhanced performance of composite cathodes in all-solid-state batteries using sulfide solid electrolyte

Sungwoo Noh, William T. Nichols, Moonju Cho, Dongwook Shin

Journal of Electroceramics > 2018 > 40 > 4 > 293-299

All-solid-state battery performance is strongly dependent on effective charge transfer at both 1) the interface of the active particles and 2) through the interstitial regions of composite cathode. Design of the composite cathode is further complicated by the necessity to limit the amount of conductor additives in order to attain high energy density. These requirements present a difficult design challenge...

article

Enhanced energy density and electrochemical performance of all-solid-state lithium batteries through microstructural distribution of solid electrolyte

Sungwoo Noh, William T. Nichols, Chanhwi Park, Dongwook Shin

Ceramics International > 2017 > 43 > 17 > 15952- 15958

Maximizing the proportion of active material in the composite cathode is a technical challenge for the All-Solid-State Lithium ion battery. Among viable solutions, employing a powder with minimized and uniform size distribution might be the most effective and practical solution. To address this issue, we carefully control the size of the high ionic conducting Li₂S-P₂S₅ solid electrolyte to a smaller...

article

Highly controlled thermal behavior of a conjugated gadolinia-doped ceria nanoparticles synthesized by particle-dispersed glycine-nitrate process

Seunghwan Lee, Dongwook Shin, Mansoo Park, Jongsup Hong, more

Journal of the European Ceramic Society > 2017 > 37 > 5 > 2159-2168

Gadolinia-doped ceria (GDC) has emerged as one of the most essential component materials for next-generation solid oxide fuel cells (SOFCs). The refractory nature of GDC has been a major hurdle for its successful implementation, and precise control of the thermal behavior is crucial. Here, we report a particle-dispersed glycine-nitrate process (PD-GNP) that leads to the formation of fast-sintering...

article

High performance all-solid-state lithium-sulfur battery using a Li2S-VGCF nanocomposite

Minyong Eom, Seunghyeon Son, Chanhwi Park, Sungwoo Noh, more

Electrochimica Acta > 2017 > 230 > C > 279-284

In lithium-sulfur batteries, cyclability is often strongly limited by a high interfacial resistance caused by poor contact between the active material and electron and lithium ion transporting materials. Here, we develop a Li₂S-VGCF (Vapor Grown Carbon Fiber) nanocomposite positive electrode for an all-solid-state lithium-sulfur battery that significantly improves cyclability. The Li₂S-VGCF nanocomposite...

article

Long term stability of porosity gradient composite cathode controlled by electro-static slurry spray deposition

Hunhyeong Lee, Sewook Lee, Taejun Lee, Sangho Park, more

International Journal of Hydrogen Energy > 2017 > 42 > 6 > 3748-3752

Proton conducting fuel cells (PCFCs) have attracted much attention due to the lower activation energy of proton transport at intermediate temperatures. The cathode of PCFCs has been studied for enhancement of cell performance. Unlike solid oxide fuel cells (SOFCs), the product of chemical reaction, H₂O, is generated in the cathode region. Generally, as the structure of the PCFC' cathode is denser...

chapter

Tractable sampling strategies for quantile-based ordinal optimization

Dongwook Shin, Mark Broadie, Assaf Zeevi

2016 Winter Simulation Conference (WSC) > 847 - 858

2016 Winter Simulation Conference (WSC)

This paper describes and analyzes the problem of selecting the best of several alternatives (“systems”), where they are compared based on quantiles of their performances. The quantiles cannot be evaluated analytically but it is possible to sequentially sample from each system. The objective is to dynamically allocate a finite sampling budget to minimize the probability of falsely selecting non-best...

article

Enhancement of lithium ion conductivity by doping Li3BO3 in Li2S-P2S5 glass-ceramics electrolytes for all-solid-state batteries

Minyong Eom, Sunho Choi, Seunghyeon Son, Lakyoung Choi, more

Journal of Power Sources > 2016 > 331 > C > 26-31

(100-x) (0.78Li₂S·0.22P₂S₅)·xLi₃BO₃ (0 ≤ x ≤ 5) solid electrolytes are prepared via mechanical milling and a post heat-treatment process, and the resulting electrochemical properties are investigated in conjunction with structural analysis. Adding of Li₃BO₃ into the (100-x) (0.78Li₂S·0.22P₂S₅)·xLi₃BO₃ solid electrolyte is expected to enhance the conductivity and lower the activation energy as a consequence...

article

Effect of Li2SO4 on the properties of Li2S–P2S5 glass-ceramic solid electrolytes

Sunho Choi, Minyong Eom, Chanhwi Park, Seunghyeon Son, more

Ceramics International > 2016 > 42 > 6 > 6738-6742

Glass-ceramic solid electrolytes of (100−x)(78Li₂S·22P₂S₅)·xLi₂SO₄ (x=0, 4, and 5) were prepared by high-energy mechanical milling and subsequent heat-treatment. The low thermal stability of the metastable thio-LISICON II analog phase of the 78Li₂S·22P₂S₅ glass-ceramics was identified by gradual transformation to a thio-LISICON III analog phase over a narrow temperature range of heat treatment. However,...

article

Enhanced electrochemical performance of surface modified LiCoO2 for all-solid-state lithium batteries

Junghoon Kim, Minjeong Kim, Sungwoo Noh, Giho Lee, more

Ceramics International > 2016 > 42 > 2 Part A > 2140-2146

Li₂CO₃-coated LiCoO₂ powders are prepared from a lithium hydroxide solution via low-temperature heat treatment and the effects on the electrochemical performance of all-solid-state lithium ion batteries (ASS-LIBs) using Li₂S-P₂S₅ glass-ceramic solid electrolytes are investigated. A combination of X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analyses reveals that...

article

Application of a carbon nanotube (CNT) sheet as a current collector for all-solid-state lithium batteries

Sunho Choi, Junghoon Kim, Minyong Eom, Xianghe Meng, more

Journal of Power Sources > 2015 > 299 > C > 70-75

To replace conventional metal electrode, flexible carbon nanotube (CNT) sheet having excellent electrical properties is first applied as a current collector in all-solid-state lithium batteries, and its effect on the performance of all-solid-state lithium batteries are investigated. In the case of cells without the CNT sheet, gaps between the all-solid-state composite cathode and metal current collector...

article

Effects of dual porosity honeycomb structure in SSC–SDC composite cathode for SOFCs

Hunhyeong Lee, Inyu Park, Jonghoon Park, Giho Lee, more

International Journal of Hydrogen Energy > 2015 > 40 > 35 > 11998- 12002

This study proposed an effective structure for the cathode of SOFC to reduce resistance, the honeycomb structure with dual porosity (micro and macro pores). A Sm_0.5Sr_0.5CoO_3−δ (SSC)–Sm_0.2Ce_0.8O_2−δ (SDC) composite cathode for solid oxide fuel cells, with a noble honeycomb structure comprising of nano and micro-sized pores, was fabricated by electrostatic slurry spray deposition (ESSD). The macro-pores...

article

Effect of glass composition on the luminescence characteristics of color conversion glasses in BaO–ZnO–B2O3–SiO2 glasses

HyeonJin Jeong, Cheolmin Huh, Tae-Young Lim, Jin-Ho Kim, more

Journal of Non-Crystalline Solids > 2015 > 423-424 > Complete > 25-29

The effect of glass composition on the properties of color conversion glasses was examined for five BaO–ZnO–B ₂ O ₃ –SiO ₂ glasses, comprised of different mol% of each of the four components. The five color conversion glasses were prepared by sintering a mixture of glass frits and a YAG phosphor. The content of the YAG phosphor was maintained at 5wt.%. The characteristics of...

article

Crystallization kinetics of Li2S–P2S5 solid electrolyte and its effect on electrochemical performance

Minyong Eom, Junghoon Kim, Sungwoo Noh, Dongwook Shin

Journal of Power Sources > 2015 > 284 > C > 44-48

The ionic conductivity of 78Li₂S·22P₂S₅ glass-ceramics is investigated as a function of the phase and the amount of precipitated crystal produces by two-step heat treatment comprising controlled nucleation and growth stages. Crystallization kinetics of amorphous 78Li₂S·22P₂S₅ is analyzed by differential thermal analysis, and the obtained results show that the maximum nucleation rate and crystal growth...

article

Effect of hybrid conductive additives on all-solid-state lithium batteries using Li2S–P2S5 glass-ceramics

Sungbo Hong, Junghoon Kim, Minjeong Kim, Xianghe Meng, more

Ceramics International > 2015 > 41 > 3 Part B > 5066-5071

In order to enhance the electrochemical performance of all-solid-state composite cathodes, a hybrid of conductive additives consisting of Vapor Grown Carbon Fiber (VGCF), which had a high aspect ratio, and Super P carbon with a high surface area, were employed in all-solid-state composite cathodes. The effect of these additives on the electrochemical properties and microstructure was investigated...

article

Electrochemical performance of continuously gradient composite cathode fabricated by electro-static slurry spray deposition

Hunhyeong Lee, Jinyi Choi, Inyu Park, Dongwook Shin

International Journal of Hydrogen Energy > 2014 > 39 > 26 > 14322- 14327

The cobalt-based cathode, LSCF, BSCF and SSC, have high thermal expansion coefficients, which cause poor thermal compatibility with electrolytes and limited cell performance. In this work, a continuously gradient Sm _0.5 Sr _0.5 CoO _3−δ (SSC) – BaCe _0.7 Zr _0.2 Y _0.1 O _3−δ (BCZY) composite cathode was developed for BCZY electrolyte based fuel cells...

article

Continuously gradient anode functional layer for BCZY based proton-conducting fuel cells

Sewook Lee, Inyu Park, Hunhyeong Lee, Dongwook Shin

International Journal of Hydrogen Energy > 2014 > 39 > 26 > 14342- 14348

This study examined the effects of a continuously gradient anode functional layer (AFL) on the performance of the BaCe _0.5 Zr _0.35 Y _0.15 O _3−δ (BCZY) based proton conducting fuel cell. The gradient AFL composed of NiO and BCZY was fabricated by the electrostatic slurry spray deposition (ESSD) technique with a rotation stage. For the comparison, the single cells without...

article

Fibrous mixed conducting cathode with embedded ionic conducting particles for solid oxide fuel cells

Jinyi Choi, Byeongseok Kim, Dongwook Shin

International Journal of Hydrogen Energy > 2014 > 39 > 26 > 14460- 14465

The Sm _0.5 Sr _0.5 CoO _3−δ (SSC) fibers with embedded nano-Sm _0.2 Ce _0.8 O _1.9 (SDC) particles are fabricated by electrospinning process using commercial SDC nanopowders and an SSC precursor gel containing polyvinyl alcohol (PVA) and aqueous metal nitrate. After calcination at 800 °C, fibers with diameters ranged between 300 and 500 nm and well-developed...

article

Preparation of nano-crystalline strontium-doped lanthanum manganate (LSM) powder and porous film by aerosol flame deposition

Jongmo Im, Inyu Park, Dongwook Shin

Ceramics International > 2014 > 40 > 4 > 5567-5573

To improve the performance of the cathode, many groups have studied the relationship between the cathode microstructure and the electrochemical performance. In this study, a porous La _0.8 Sr _0.2 MnO _3±δ (LSM) cathode film with primary particles of under 10nm diameters was prepared by aerosol flame deposition (AFD). The AFD technique was applied to synthesize the spherical particles...

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INFONA - science communication portal

Search results for: Dongwook Shin

Analysis of hybrid discontinuous Galerkin methods for linearized Navier–Stokes equations

National cancer screening program for gastric cancer in Korea: Nationwide treatment benefit and cost

Importance of mixing protocol for enhanced performance of composite cathodes in all-solid-state batteries using sulfide solid electrolyte

Enhanced energy density and electrochemical performance of all-solid-state lithium batteries through microstructural distribution of solid electrolyte

Highly controlled thermal behavior of a conjugated gadolinia-doped ceria nanoparticles synthesized by particle-dispersed glycine-nitrate process

High performance all-solid-state lithium-sulfur battery using a Li2S-VGCF nanocomposite

Long term stability of porosity gradient composite cathode controlled by electro-static slurry spray deposition

Tractable sampling strategies for quantile-based ordinal optimization

Enhancement of lithium ion conductivity by doping Li3BO3 in Li2S-P2S5 glass-ceramics electrolytes for all-solid-state batteries

Effect of Li2SO4 on the properties of Li2S–P2S5 glass-ceramic solid electrolytes

Enhanced electrochemical performance of surface modified LiCoO2 for all-solid-state lithium batteries

Application of a carbon nanotube (CNT) sheet as a current collector for all-solid-state lithium batteries

Effects of dual porosity honeycomb structure in SSC–SDC composite cathode for SOFCs

Effect of glass composition on the luminescence characteristics of color conversion glasses in BaO–ZnO–B2O3–SiO2 glasses

Crystallization kinetics of Li2S–P2S5 solid electrolyte and its effect on electrochemical performance

Effect of hybrid conductive additives on all-solid-state lithium batteries using Li2S–P2S5 glass-ceramics

Electrochemical performance of continuously gradient composite cathode fabricated by electro-static slurry spray deposition

Continuously gradient anode functional layer for BCZY based proton-conducting fuel cells

Fibrous mixed conducting cathode with embedded ionic conducting particles for solid oxide fuel cells

Preparation of nano-crystalline strontium-doped lanthanum manganate (LSM) powder and porous film by aerosol flame deposition

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