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Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement

Journal of Materials Science & Technology 2018年第2期34卷 265-276页

作者： Sang-hoon Kim Jong Un Lee Ye Jin Kim Jun ho Bae Bong Sun You sung Hyuk park School of Materials Science and Engineering Kyungpook National University Implementation Research Division Korea Institute of Materials Science

This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size. Grain size reduction accelerates discontinuous precipitation at the early stage of aging treatment by increasing the area fraction of grain boundaries that can act as nucleation sites for discontinuous precipitates （DP）, but it does not influence DP growth rate. Grain refinement also prematurely terminates continuous precipitation because the formation of a large number of DP reduces the amount of AI dissolved in the matrix, which is required for the formation of continuous precipitates （CP）. This promotion of DP formation and early termination of CP formation significantly decrease the peak-aging time to one-third. The enhanced precipitation behavior also leads to an additional hardness improvement in the aged alloy, along with an increase in hardness owing to grain boundary strengthening by grain refinement. The amount of increase in hardness changes with aging time, which is determined by the variation of three variables with aging time： DP fraction difference between refined and nonrefined alloys, hardness difference between DP and matrix, and matrix hardness difference between the two alloys. Grain refinement improves both tensile strength and ductility of the homogenized alloy owing to grain boundary strengthening and suppression of twinning activation, respectively. however, the loss of ductility after peak-aging treatment is greater in the refined alloy because of the larger amount of DP acting as a crack source in this alloy.

关键词： Magnesium Grain refinement Aging Precipitation Tensile properties

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Redox Charge Transfer Kinetics and Reversibility of VO_(2) in Aqueous and Non-Aqueous Electrolytes of Na-Ion Storage

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Energy & Environmental Materials 2022年第4期5卷 1222-1228页

作者： Sul Ki park Kang ho Shin Puritut Nakhanivej Harpalsinh H.Rana ho Seok park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Republic of Korea Department of Engineering University of CambridgeCambridge CB30FSUK Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

The deep understanding about the electrochemical behavior of the nanostructured electrode in electrolytes provides crucial insights for the rational design of electrode for sodium(Na)-ion storage system(NIS).Here,we report redox charge transfer kinetics and reversibility of VO_(2)(B) nanorod electrodes in both aqueous and organic electrolytes for *** assynthesized VO_(2)(B) nanorods show the reversible redox reaction with the higher specific and rate capacitances at high current density in aqueous electrolytes than in organic ***-dependent impedance measurements demonstrate the more facile interfacial charge transfer of Na ions into VO_(2)(B) nanorods in aqueous *** reversible evolution in oxidation state and chemical composition of VO_(2)(B) nanorods is observed in aqueous electrolytes,as confirmed by ex situ XRD and ex situ X-ray photoelectron spectroscopy *** by the facile and reversible pseudocapacitive feature,the electrochemical performances of VO_(2)(B) nanorods are further improved by constructing the hierarchical structure of the reduced graphene oxide-VO_(2) composite for aqueous Na+ion storage.

关键词： aqueous electrolyte energy storage mechanism hierarchical structure nanorod sodium ion storage

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Perspective on High-Energy Carbon-Based Supercapacitors

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Energy & Environmental Materials 2020年第3期3卷 286-305页

作者： Qingyun Dou ho Seok park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea

Supercapacitors based on carbon materials have advantages such as high power density,fast charging/discharging capability,and long lifetime stability,playing a vital role in the field of electrochemical energy storage *** further expand the practical applications of carbon-based supercapacitors,their energy density,which is essentially determined by the specific capacitance and operating voltage,should be *** review provides fundamental knowledge on achieving high energy density of *** first address the relationship of the features of carbon materials,such as the surface area,pore size distribution,and surface functional groups,with their electrochemical performances,such as the gravimetric and volumetric capacitance,surface pseudocapacitance,and operating ***,we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects,and present their effects on capacitance and operating ***,we illustrate different cell design strategies and their basic principles for increasing operating *** also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

关键词： carbon material cell design electrolyte energy density supercapacitors

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Synthesis of Al-doped ZnO Nanorods via Microemulsion Method and Their Application as a CO Gas Sensor

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Journal of Materials Science & Technology 2015年第6期31卷 639-644页

作者： Sang Kyoo Lim Seong Hui hong sung-ho Hwang Won Mi Choi Soonhyun Kim Hyunwoong park Min Gi Jeong Division of Nano & Bio Technology Daegu Gyeongbuk Institute of Science and Technology(DGIST) School of Energy Engineering Kyungpook National University Department of Advanced Organic Materials Engineering Yeungnam University

Aluminum doped ZnO(AZO) nanorods were synthesized by microemulsion method with different types of *** phase and the morphology of the above nanorods were investigated by scanning electron microscopy(SEM) and X-ray diffraction(XRD).SEM observations showed that the ZnO nanorods had diameters around about 50—200 nm and lengths up to several *** CO gas sensing properties of the AZO nanorods were tested at operating temperatures of 200,300,350 and 400 ℃.It was found that AZO nanorods based sensor exhibited the highest sensitivity to CO at 350℃.

关键词： Zinc oxide Nanorod Microemulsion Aluminum CO and g

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Growth and Magnetic Properties of Sol-Gel Derived Co-Doped ZnO Thin Film

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Journal of Rare Earths 2006年第Z1期24卷 59-63页

作者： Young sung Kim Ki Chul Kim Won Pil Tae Dae ho Yoon Tae Seok park Su Jeong Suh Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Cambridge-ETRI Joint R&D Centre Electronics and Telecommunications Research Institute Daejeon 305-350 Korea Ulsan Industry Promotion Techno Park Ulsan 683-804 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea Advanced Material Process of Information Technology Sungkyunkwan University Suwon 440-746 Korea

Zn1-xCoxO films were grown on glass by sol-gel spin coating process. A homogeneous and stable Zn1-xCoxO sol was prepared by dissolving zinc acetate dihydrate, cobalt acetate tetrahydrate and aluminium chloride hexahydrate as solutes in solution of isopropanol and monoethanolamine. The films were postheated and vacuum annealed, and investigated for c-axis preferred orientation and electromagnetic properties. Zn1-xCoxO films with different Co concentrations were oriented well along the c-axis, especially the Zn1-xCoxO film with 10% Co(atom fraction) was highly c-axis oriented. The transmittance spectra show that Zn1-xCoxO films occur d-d transition and sp-d exchange interaction between Co2+ ions. The electrical resistivity of the films at 10% Co had the lowest value because the crystallite size became largest and the crystallinity of the c-axis was improved. X-ray photoelectron spectroscopy and alternating gradient magnetometer analyses indicated that no Co metal cluster was formed, and the ferromagnetism at room temperature appeared. The characteristics of the electrical resistivity and room temperature ferromagnetism of sol-gel derived Zn1-xCoxO films suggest a potential application of dilute magnetic semiconductor devices.

关键词： sol-gel Zn1-xCoxO thin film dilute magnetic semiconductor (DMS)

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Bevacizumab as a second- or later-line of treatment for metastatic colorectal cancer

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World Journal of Gastroenterology 2012年第10期18卷 1104-1109页

作者： Lee Chun park ho Sup Lee Seong hoon Shin Seun Ja park Moo In park sung Yong Oh Hyuk Chan Kwon Jin ho Baek Young Jin Choi Myoung Joo Kang Yang Soo Kim Department of Internal Medicine Kosin University College of Medicine Busan 602-703 South Korea Department of Internal Medicine Dong-A University Hospital Busan 602-715 South Korea Jin ho Baek Department of Internal Medicine Ulsan University Hospital Ulsan 682-714 South Korea Department of Internal Medicine Busan National University Hospital Busan 626-770 South Korea Department of Internal Medicine Busan Paik Hospital Busan 614-735 South Korea

AIM: To determine the efficacy of bevacizumab in patients with metastatic colorectal cancer (MCRC) who have failed prior chemotherapy without bevacizumab. METhoDS: Between March 2002 and June 2010, 40 patients in South Korea with MCRC who were treated with bevacizumab plus chemotherapy as a second or later-line treatment were analyzed retrospectively for their overall response rate (ORR), overall survival (OS), and progression-free survival (PFS). The tumor responses were assessed using the RECIST (Response Evaluation Criteria in Solid Tumors) guidelines. RESULTS: All of the patients had progressed under prior chemotherapy without bevacizumab. Three patients (7.5%) exhibited an ORR, twenty one patients (52.5%) exhibited stable disease (SD), and fifteen patients (37.5%) exhibited disease progression. The median duration of the OS and PFS were 14.0 and 6.13 mo respectively. The median OSs were 16.60, 14.07 and 13.00 mo for second-line, third-line and fourth- or later-line treatments, respectively. The median PFSs were 7.23, 7.30 and 3.87 mo for the second-line, third-line and fourth- or later-line treatments, respectively. CONCLUSION: In patients with MCRC, bevacizumab combined chemotherapy may be beneficial during second- or later-line treatment.

关键词： Colorectal cancer Metastasis Bevacizumab Efficacy Second- or later-line

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Attractor landscape analysis of the cardiac signaling network reveals mechanism-based therapeutic strategies for heart failure

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Journal of Molecular Cell Biology 2018年第3期10卷 180-194页

作者： Daebeom park ho-sung Lee Jun Hyuk Kang Seon-Myeong Kim Jeong-Ryeol Gong Kwang-Hyun Cho Laboratory for Systems Biology and Bio-inspired Engineering Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Graduate School of Medical Science and Engineering KAIST Daejeon 34141 Republic of Korea

Apoptosis and hypertrophy of cardiomyocytes are the primary causes of heart failure （HF）, a global leading cause of death, and are regulated through the complicated intracellular signaling network, limiting the development of effective treatments due to its complexity. To identify effective therapeutic strategies for HF at a system level, we develop a large-scale comprehensive mathematical model of the cardiac signaling network by integrating all available experimental evidence. Attractor landscape analysis of the network model identifies distinct sets of control nodes that effectively suppress apoptosis and hypertrophy of cardiomyocytes under ischemic or pressure overload-induced HF, the two major types of HF. Intriguingly, our system-level analysis suggests that intervention of these control nodes may increase the efficacy of clinical drugs for HF and, of most importance, different combinations of control nodes are suggested as potentially effective candidate drug targets depending on the types of HF. Our study provides a systematic way of developing mechanism-based therapeutic strategies for HF.

关键词： heart failure mathematical modeling cardiac signaling network systems analysis disease mechanism mechanism-based therapeutic strategy systems biology

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Conventional endoscopic features are not sufficient to differentiate small, early colorectal cancer

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World Journal of Gastroenterology 2014年第21期20卷 6586-6593页

作者： Wan park Bun Kim Soo Jung park Jae Hee Cheon Tae Il Kim Won ho Kim sung Pil hong Department of Internal Medicine and Institute of Gastroenterology Yonsei University College of MedicineSeoul 120-752South Korea

AIM: To evaluate the depth of invasion of small, early colorectal cancers (ECCs) using conventional endoscopic features.

关键词： Colonoscopy Colorectal neoplasms Differential diagnosis

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Interstitial lung disease induced by the roots of Achyranthes japonica Nakai:Three case reports

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World Journal of Clinical Cases 2021年第8期9卷 2015-2021页

作者： Do-Sik Moon sung-ho Yoon Seung-Il Lee Sang-Gon park Yong-Sub Na Department of Pulmonology and Critical Care Medicine Chosun University HospitalGwangju 61453South Korea Department of Internal Medicine Hemato-OncologyChosun University HospitalGwangju 61453South Korea

BACKGROUND The roots of Achyranthes japonica Nakai(AJN),called“Useul-puli,”has been traditionally used to control pain and improve dysfunction in osteoarthritis patients in South *** SUMMARY We described 3 patients diagnosed with herbal medicine induced interstitial lung disease after consuming boiled the roots of *** were referred to our hospital because of the modified Medical Research Council grade 4 *** computed tomography showed bilateral ground-glass opacities with patchy *** treatment with systemic glucocorticoid therapy and discontinuation of the roots of AJN,their symptoms improved,and almost all ground-glass opacities and patchy consolidations on chest radiography and chest computed tomography *** We present three cases of interstitial lung disease induced by the roots of AJN.

关键词： Herb Interstitial lung disease Achyranthes japonica Nakai Case report

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Highly flexible and transparent conducting silver nanowire/ZnO composite film for organic solar cells

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Nano Research 2014年第9期7卷 1370-1379页

作者： Myungkwan Song Jong Hyun park Chang Su Kim Dong-ho Kim Yong-Cheol Kang sung-ho Jin Won-Yong Jin Jae-Wook Kang Surface Technology Division Korea Institute of Materials Science Changwon 641-831 Republic of Korea OLED Development Group LG Display Co. Ltd. Gyeonggi-do 413-811 Republic of Korea Department of Chemistry Pukyong National University 45 Yongso-ro Nam-Gu Busan 608-737 Republic of Korea Department of Chemistry Education Graduate Department of Chemical Materials and Institute for Plastic Information and Energy Materials Pusan National University Busan 609-735 Republic of Korea The Graduate School of Flexible and Printable Electronics Polymer Materials Fusion Research Center Chonbuk National University Jeonju 561-756 Republic of Korea

High efficiency and flexible inverted organic solar cells have been fabricated using solution-processed silver nanowire/zinc oxide composite transparent electrodes. The transparent electrodes showed a low sheet resistance of -13 ff）.sq-1 and high transmittance of -93% as well as superior mechanical flexibility. Power conversion efficiencies of -7.57% and -7.21% were achieved for devices fabricated on glass and plastic substrate, respectively. Moreover, the flexible devices did not show any degradation in their performance even after being folded with a radius of-480 μm.

关键词： silver nanowire flexible transparent conductingelectrode inverted organic solar cell

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