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Utilizing hybrid faradaic mechanism via catalytic and surface interactions for high-performance flexible energy storage system

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能源化学:英文版 2023年第8期83卷 541-548,I0013页

作者： Dong-Gyu Lee Hyeonggeun Choi Yeonsu Park Min-Cheol Kim Jong Bae Park Suok Lee younghyun Cho wook Ahn A-Rang Jang Jung Inn sohn John Hong young-woo Lee Department of Energy Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Division of Physics and Semiconductor Science Dongguk University-SeoulSeoul 04620Republic of Korea Jeonju Centre Korea Basic Science InstituteJeonju 54907Republic of Korea Division of Electrical Electronic and Control EngineeringKongju National UniversityCheonan 31080Republic of Korea School of Materials Science and Engineering Kookmin UniversitySeoul 02707Republic of Korea

Improving the capacitance and energy density is a significant challenge while developing practical and flexible energy storage system(ESS).Redox mediators(RMs),as redox-active electrolyte additives,can provide additional energy storing capability via electrochemical faradaic contribution on electrodes for high-performance flexible ***,determining effective material combinations between electrodes and RMs is essential for maximizing surface faradaic redox reactions for energy-storage *** this study,an electrode-RM system comprising heterostructured hybrid(carbon fiber(CF)/MnO_(2)) faradaic electrodes and iodine RMs(I-RMs) in a redox-active electrolyte is *** CF/MnO_(2)with the 1-RMs(CF/MnO_(2)-I) induces dominant catalytic faradaic interaction with the I-RMs,significantly enhancing the surface faradaic kinetics and increasing the overall energy-storage *** CF/MnO_(2)-I ESSs show a 12.6-fold(or higher) increased volumetric energy density of 793.81 mWh L^(-1)at a current of 10 μA relative to ESSs using CF/MnO_(2)without I-RMs(CF/MnO_(2)).Moreover,the CF/MnO_(2)-I retains 93.1% of its initial capacitance after 10,000 cycles,validating the excellent ***,the flexibility of the ESSs is tested at different bending angles(180° to 0°),demonstrating its feasibility for flexible and high-wear ***,CF/MnO_(2)electrodes present a practical material combination for high-performance flexible energy-storage devices owing to the catalytic faradaic interaction with I-RMs.

关键词： Energy storage system Redox mediators Faradaic electrodes Catalytic interactions Mechanical stability

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Evaluation of early-age strains and stresses in roller-compacted concrete pavement

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 93-105页

作者： Tetsya Sok young Kyu Kim Jun young Park Seung woo Lee Public Infrastructure Department Ministry of Public Works and TransportPhnom Penh 12100Cambodia Institute for Disaster Prevention Gangneung-Wonju National UniversityGangneung-si 25457South Korea Korea Expressway Research Institute Korea Expressway CorporationHwaseong-si 18489South Korea Civil Engineering Department Gangneung-Wonju National UniversityGangneung-si 25457South Korea

In the structural design of a roller-compacted concrete pavement(RCCP), it is crucial to estimate strain and stress developments in the RCCP slab realistically. Since the RCCP mix uses less cement and lower amount of water, shrinkage strain and concrete temperature during the hardening stage are expected to be reduced as compared to those of conventional concrete mixture, resulting in a reduction of the concrete early-age deformation and stress developments in the RCCP slab. In this paper, early-age concrete strain and stress developments in RCCP slab subjected to environmental loads were evaluated. A full-scale test section of RCCP under real climatic conditions was monitored. The early-age total strains,stress-independent strains, shrinkage strains, and coefficient of thermal expansion(CTE) of the RCCP were measured and analyzed. Using the results of measured strains, in-situ CTE and shrinkage strain, and temperature, the early-age concrete stress development is computed by incorporating a viscoelastic property of the early-age concrete. The results revealed that the shrinkage strain of the RCCP is quite low as compared to that of conventional concrete. The early-age stress developments in the RCCP slab are strongly governed by the thermal-induced stresses. Shrinkage-induced stresses were quite small and might be negligible in a preliminary estimation of early-age stress developments in the RCCP slab.

关键词： Road engineering Roller-compacted concrete pavement Concrete strain Concrete stress Shrinkage strain Environmental loads

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Prognostic value of decision criteria for emergency liver transplantation in patients with wild mushroom induced acute liver injury

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Hepatobiliary & Pancreatic Diseases International 2018年第3期17卷 210-213页

作者： Youn-Jung Kim Hyung Joo Lee Seung Mok Ryoo Shin Ahn Chang Hwan sohn Dong-woo Seo Kyoung Soo Lim Won young Kim Department of Emergency Medicine University of Ulsan College of Medicine Asan Medical Center

Background： The reported mortality rate of mushroom-induced acute liver failure with conventionaltreatment is 1.4%–16.9%. Emergency liver transplantation may be indicated and can be the only curativetreatment option. This study aimed to assess the prognostic value of criteria for emergency livertransplantation in predicting 28-day mortality in patients with mushroom-induced acute liver ***： A retrospective cohort study was performed between January 2005 and December 2015. Alladult patients aged≥18 years admitted with mushroom intoxication at our emergency department wereevaluated. All patients with acute liver injury, defined as elevation of serum liver enzymes （〉5 timesthe upper limit of normal, ULN） or moderate coagulopathy （INR 〉 2.0） were included. The ability of the King’s College, Ganzert’s, and Escudié’s criteria to predict 28-day mortality was evaluated.

关键词： Liver failure Mushroom poisoning Liver transplantation Clinical decision making

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Semi-crystalline photovoltaic polymers with siloxane-terminated hybrid side-chains

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Science China Chemistry 2017年第4期60卷 528-536页

作者： Yuxiang Li Seyeong Song Song Yi Park Jin young Kim Han young woo Department of Cogno-Mechatronics Engineering Pusan National University Miryang 627-706 Republic of Korea Department of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan 689-798 Republic of Korea Department of Chemistry Korea University Seoul 136-713 Republic of Korea

Three types of semi-cry stalline photovoltaic polymers were synthesized by incorporating a siloxane-terminated organic/inorganic hybrid side-chain and changing the number of fluorine substituents.A branch point away from a polymer main backbone in the siloxane-containing side-chains and the intra-and/or interchain noncovalent coulombic interactions enhance a chain planarity and facile interchain *** resulting polymers formed strongly agglomerated films with high roughness,suggesting strong intermolecular *** optical band gap of ca.1.7 eV was measured for all polymers with a pronounced shoulder peak due to tight π-π *** increasing the fluorine substituents,the frontier energy levels decreased and preferential face-on orientation was *** siloxane-terminated side-chains and fluorine substitution promoted the intermolecular packing,showing well resolved lamellar scatterings up to(300) for this series of polymers in the grazing incidence wide angle X-ray scattering *** PPsiDTBT,PPsiDTFBT and PPsiDT2 FBT devices showed a power conversion efficiency of 3.16%,4.40%and 5.65%,respectively,by blending with PC_(71)***-type bimolecular charge recombination was similar for three polymeric solar *** main loss in the photocurrent generation for PPsiDTBT:PC_(71)BM was interpreted to originate from the trap assisted charge recombination by measuring light-intensity dependent short-circuit current density(J_(SC)) and open-circuit voltage(V_(Oc)).Our results provide a new insight into the rational selection of solubilizing substituents for optimizing crystalline interchain packing with appropriate miscibility with PC71 BM for further optimizing polymer solar cells.

关键词： siloxane side-chain fluorine substitution semi-crystalline charge transport

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Joining Technology of Dissimilar Materials for Automotive Components(Ⅱ)

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Journal of Rare Earths 2004年第z2期22卷 35-37页

作者： Meung Ho Rhee Jong Ho Song woo young Chung young Myoung Kim Korea Automotive Technology Institute 74 Yongjung-RiPungse-MyunChonanChungnam330-912KOREA Korea Automotive Technology Institute74 Yongjung-RiPungse-MyunChonanChungnam330-912KOREA Korea Automotive Technology Institute74 Yongjung-RiPungse-MyunChonanChungnam330-912KOREA Korea Automotive Technology Institute74 Yongjung-RiPungse-MyunChonanChungnam330-912KOREA

Joining techniques of dissimilar materials for lightweight multi-material automotive body structure were discussed. The joining of 1 .4 mm thickness steel and 2 mm thickness of Al were performed by the new method that is hybrid laser welding system. After aluminum and steel were welded by laser hybrid welding process, the micro-structure investment and the micro-hardness test were carried out. Hybrid laser welding promises a bright future in joining technology of dissimilar materials for automotive components.

关键词： multi-material automotive body dissimilar materials hybrid laser welding

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Stimulation of melanogenesis by scoparone in B16 melanoma cells

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Acta Pharmacologica Sinica 2006年第11期27卷 1467-1473页

作者： Jeong-yeh YANG Jeung-hyunKOO young-gilSONG Kang-beom KWON Ju-hyung LEE Hee-sook sohn Byung-hyun PARK Eun-chung JHEE Jin-woo PARK Department of Biochemistry Dental SchoolChonbuk National UniversityJeonju 561-756Korea Department of Biochemistry Medical School Chonbuk National UniversityJeonju 561-756Korea Department of Physiology School of Oriental MedicineWon-Kwang UniversityIksan 570-749Korea Department of Preventive Medicine Medical School Department of Food Science and Human Nutrition College of Home EconomyChonbuk National UniversityJeonju 561-756Korea Department of Biochemistry Medical SchoolChonbuk National UniversityJeonju 561-756Korea Institute for Healthcare Technology DevelopmentChonbuk National UniversityJeonju 561-756Korea Department of Biochemistry Medical SchoolChonbuk National UniversityJeonju 561-756Korea Institute for Healthcare Technology Development Chonbuk National UniversityJeonju 561-756Korea

Aim:The effect of coumarin derivatives on melanogenesis was investigated inB16 murine melanoma ***:Melanin content and tyrosinase activitywere analyzed *** expression of tyrosinase,tyrosinase-related protein-1(TRP-1)and tyrosinase-related protein-2(TRP-2)were measuredeither by reverse transcription-polymerase chain reaction(RT-PCR)or ***:Among the coumarin derivatives studied,scoparone(6,7-dimethoxycoumarin)was the most potent;the 6-or 7-methoxy group was found tobe essential for the stimulation of *** melanin content was greatlyincreased by scoparone in a dose-dependent manner;there was no cytotoxicity atthe effective *** increased enzyme activity as well asprotein and mRNA expression of *** addition,mRNA of TRP-1 andTRP-2 were also increased after treatment with scoparone.H-89,an inhibitor ofprotein kinase A(PKA),completely inhibited the scoparone-induced increase ofmelanogenesis and the tyrosinase ***:These results suggestthat scoparone-induced stimulation of melanogenesis is likely to occur at thetranscriptional level of melanogenesis-related enzymes through PKA signaling.

关键词： melanogenesis scoparone (6,7-dimethoxy-coumarin) tyrosinase tyrosinase-related proteins protein kinase A

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Development of genome engineering technologies in cattle: from random to specific

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Journal of Animal Science and Biotechnology 2018年第2期9卷 285-293页

作者： Soo-young Yum Ki-young Youn woo-Jae Choi Goo Jang Department of Veterinary Clinical Science College of Veterinary Medicine and the Research Institute of Veterinary Science Seoul National University Farm Animal Clinical Training and Research Center Institute of Green Bio Science Technology Seoul National University Emergence Center for Food-Medicine Personalized Therapy System Advanced Institutes of Convergence Technology Seoul National University College of Veterinary Medicine Seoul National University

The production of transgenic farm animals(e.g., cattle) via genome engineering for the gain or loss of gene functions is an important undertaking. In the initial stages of genome engineering, DNA micro-injection into one-cell stage embryos(zygotes) followed by embryo transfer into a recipient was performed because of the ease of the ***, as this approach resulted in severe mosaicism and has a low efficiency, it is not typically employed in the cattle as priority, unlike in mice. To overcome the above issue with micro-injection in cattle, somatic cell nuclear transfer(SCNT) was introduced and successfully used to produce cloned livestock. The application of SCNT for the production of transgenic livestock represents a significant advancement, but its development speed is relatively slow because of abnormal reprogramming and low gene targeting efficiency. Recent genome editing technologies(e.g.,ZFN, TALEN, and CRISPR-Cas9) have been rapidly adapted for applications in cattle and great results have been achieved in several fields such as disease models and bioreactors. In the future, genome engineering technologies wil accelerate our understanding of genetic traits in bovine and wil be readily adapted for bio-medical applications in cattle.

关键词： Cattle CRISPR-Cas9 Genome engineering technologies Transgenesis Transposon

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Increasing sulfur utilization in lithium-sulfur batteries by a Co-MOF-74@MWCNT interlayer

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Journal of Energy Chemistry 2021年第9期30卷 186-193页

作者： SiHyeon Sung Byung Hyuk Kim SeungTaek Lee Sanghyeon Choi woo young Yoon Department of Materials Science and Engineering Korea University15GaAnam-dongSungbuk-GuSeoul 136-701Republic of Korea

To improve lithium-sulfur battery performance,Co-MOF-74 has been applied for the first time as an interlayer with multiwalled carbon nanotubes(MWCNTs).Co-MOF-74@MWCNT was synthesized using a solvothermal *** fabrication of Co-MOF-74@MWCNT was confirmed by scanning electron microscopy,X-ray diffraction,thermogravimetric analysis,and Brunauer-Emmett-Teller *** interlayer was fabricated using a filtration *** batteries were prepared using a CoMOF-74@MWCNT interlayer and an MWCNT interlayer and subsequently investigated via cyclic voltammetry ***-MOF-74 promotes a redox reaction and shows a small peak at 1.85 V.A symmetric and full cell test revealed that the Co-MOF-74@MWCNT cell enables a faster redox reaction and higher capacity than that of the MWCNT *** 15 cycles,the Co-MOF-74@MWCNT cell achieved a value of 1112 mAh g^(-1),which is 26% greater than that of the MWCNT cell(880 mAh g^(-1)) at 0.2 *** profile testing showed that the reason for the higher capacity of the Co-MOF-74@MWCNT cell is that it promotes the conversion of Li_(2)S_(2) to Li_(2)*** electrochemical analyses confirmed that the Co-MOF-74@MWCNT interlayer acts not only as a physical and chemical barrier but also promotes the transformation of Li_(2)S_(2) to Li_(2)S.

关键词： Li-S battery Shuttling effect Interlayer Sulfur utilization Co-MOF-74

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Preparation of human decellularized peripheral nerve allograft using amphoteric detergent and nuclease

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Neural Regeneration Research 2021年第9期16卷 1890-1896页

作者： Joo-Yul Bae Suk young Park young Ho Shin Shin woo Choi Jae Kwang Kim Department of Orthopedic Surgery University of Ulsan College of MedicineGangneung Asan HospitalGangneung-siKorea Department of Orthopedic Surgery University of Ulsan College of MedicineAsan Medical CenterSeoulKorea

Animal studies have shown that amphoteric detergent and nuclease(DNase I and ribonuclease A) is the most reliable decellularization method of the peripheral nerve. However, the optimal combination of chemical reagents for decellularization of human nerve allograft needs further investigation. To find the optimal protocol to remove the immunogenic cellular components of the nerve tissue and preserve the basal lamina and extracellular matrix and whether the optimal protocol can be applied to larger-diameter human peripheral nerves, in this study, we decellularized the median and sural nerves from the cadavers with two different methods: nonionic and anionic detergents(Triton X-100 and sodium deoxycholate) and amphoteric detergent and nuclease(3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate(CHAPS), deoxyribonuclease I, and ribonuclease A). All cellular components were successfully removed from the median and sural nerves by amphoteric detergent and nuclease. Not all cellular components were removed from the median nerve by nonionic and anionic detergent. Both median and sural nerves treated with amphoteric detergent and nuclease maintained a completely intact extracellular matrix. Treatment with nonionic and anionic detergent decreased collagen content in both median and sural nerves, while the amphoteric detergent and nuclease treatment did not reduce collagen content. In addition, a contact cytotoxicity assay revealed that the nerves decellularized by amphoteric detergent and nuclease was biocompatible. Strength failure testing demonstrated that the biomechanical properties of nerves decellularized with amphoteric detergent and nuclease were comparable to those of fresh controls. Decellularization with amphoteric detergent and nuclease better remove cellular components and better preserve extracellular matrix than decellularization with nonionic and anionic detergents, even in large-diameter human peripheral nerves. In Korea, cadaveric studies are not yet l

关键词： median nerve sural nerve nuclease detergent human decellularized nerve graft

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Effects of Temperature on Photosynthetic Rates in Korean Fir (Abies koreana) between Healthy and Dieback Population

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Journal of Integrative Plant Biology 2008年第2期50卷 190-193页

作者： Su young woo Jong-Hwan Lim Don Koo Lee Department of Environmental Horticulture University of Seoul Seoul 130-743 Republic of Korea Korea Forest Research Institute Seoul 130-712Republic of Korea Department of Forest Sciences College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921Republic of Korea

The present study was carried out on natural Korean fir forests （Abies koreana） growing in Mount Halla in Jeju Island, Korea （33° 13-36＇ N and 126° 12-57＇ E）. Mount Halla is the highest mountain （1 950 m a.s.h） in South Korea. On the Korean fir forests near the top of Mount Halla in Korea, we established permanent plots between dieback and healthy population. Each permanent plot includes both dieback and relatively healthy Korean fir individuals. Three sites in this study showed similar altitude, topographic position, aspects, slope, diameter at breast height, average height and ages. Net photosynthetic rates （PN） on different temperature regimes were evaluated to explain the forest dieback phenomenon on Korean fir populations. Light response curves were determined on three different temperature regimes： 15 ℃, 20℃ and 25℃. The irradiance response curve showed higher values in lower air temperatures. Generally, irradiance response curves of healthy Korean fir populations were higher than the dieback population at all sites.

关键词： Abies koreana global warming forest decline photosynthetic rates temperature.

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