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Electrochemical Performance and ex situ Analysis of ZnMn2O4 Nanowires as Anode Materials for Lithium Rechargeable Batteries

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Nano Research 2011年第5期4卷 505-510页

作者： Sung-wook Kim hyun-wook lee Pandurangan Muralidharan Dong-Hwa Seo Won-Sub Yoon Do Kyung Kim Kisuk Kang Research Institute of Advanced Materials Seoul National University 599 Kwanak-ro Kwanak-gu Seoul 151-742 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 335 Gwahangno Yuseong-gu Daejeon 305-701 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 335 Gwahangno Yuseong-gu Daejeon 305-701 Republic of Korea Department of Materials Science and Engineering Seoul National University 599 Kwanak-ro Kwanak-gu Seoul 151-742 Republic of Korea

One-dimensional ZnMn2O4 nanowires have been prepared and investigated as anode materials in Li rechargeable batteries. The highly crystalline ZnMn2O4 nanowires about 15 nm in width and 500 nm in length showed a high specific capacity of about 650 mAh.g-1 at a current rate of 100 mA.g-1 after 40 cycles. They also exhibited high power capability at elevated current rates, i.e., 450 and 350 mAh.g 1 at current rates of 500 and 1000 mA.g 1, respectively. Formation of Mn3O4 and ZnO phases was identified by ex situ X-ray diffraction （XRD） and transmission electron microscopy （TEM） studies after the initial discharge-charge cycle, which indicates that the ZnMn2O4 phase was converted to a nanocomposite of Mn3O4 and ZnO phases immediately after the electrochemical conversion reaction.

关键词： Energy storage lithium rechargeable battery anode ZnMn204 nanowire

Priapism secondary to penile metastasis of rectal cancer

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World Journal of Gastroenterology 2009年第33期15卷 4209-4211页

作者： Ji Chan Park wook hyun lee Min Kyu Kang Suk Young Park Division of Oncology Department of Internal MedicineThe Catholic University of KoreaDaejeon St. Mary's Hospital

Metastatic penile carcinoma is rare and usually originates from genitourinary tumors. The presenting symptoms or signs have been described as nonspecific except for priapism. Rectal adenocarcinoma is a very unusual source of metastatic penile carcinoma. We report a case of metastatic penile carcinoma that originated from the rectum. Symptomatic improvement occurred with palliative radiotherapy.

关键词： Penile neoplasms Neoplasm metastasis Priapism Rectal cancer

Immortalization of epidural fat-derived mesenchymal stem cells: In vitro characterization and adipocyte differentiation potential

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World Journal of Stem Cells 2025年第1期17卷 40-52页

作者： Seoung-Woo lee Young-Ju Lim Hee-Yeon Kim Wansoo Kim wook-Tae Park Min-Jung Ma Junho lee Min-Soo Seo Young In Kim Sangbum Park Seong-Kyoon Choi Gun Woo lee Core Protein Resources Center Daegu-Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea Department of Orthopedic Surgery Yeungnam University Medical CenterYeungnam University College of MedicineDaegu 42415South Korea Department of Veterinary Pathology College of Veterinary MedicineKyungpook National UniversityDaegu 41566South Korea School of Life Science BK21 FOUR KNU Creative BioResearch GroupKyungpook National UniversityDaegu 41566South Korea Laboratory of Veterinary Tissue Engineering College of Veterinary MedicineKyungpook National UniversityDaegu 41566South Korea College of Veterinary Medicine Kyungpook National UniversityDaegu 41566South Korea Department of Veterinary Tissue Engineering Kyungpook National UniversityDaegu 41566South Korea Cellexobio. Ltd.Daegu 42415South Korea Michigan State University Institute for Quantitative Health Science&EngineeringEast LansingMI 48824United States Department of Orthopedic Surgery Yeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Mesenchymal stem cells(MSCs)are promising candidates for regenerative therapy due to their self-renewal capability,multilineage differentiation potential,and immunomodulatory *** molecular characteristics of MSCs are influenced by their ***,epidural fat(EF)and EF-derived MSCs(EF-MSCs)have garnered attention due to their potential benefits to the spinal microenvironment and their high expression of neural SC ***,their clinical applications are limited due to cell senescence and limited accessibility of *** many studies have attempted to establish an immortalized,stable SC line,the characteristics of immortalized EF-MSCs remain to be *** To establish and analyze stable immortalized *** The phenotypes of EF-MSCs were analyzed using optical *** immortalization was performed using lentiviral *** biomolecular characteristics of the cells were analyzed by immunoblotting,quantitative PCR,and *** The immortalized EF-MSCs demonstrated a significantly extended lifespan compared to the control group,with well-preserved adipogenic potential and SC surface marker *** of human telomerase reverse transcriptase genes markedly increased the lifespan of *** analysis revealed substantial increase in the expression of DNA replication pathway components in immortalized *** Immortalized EF-MSCs exhibited significantly enhanced proliferative capacity,retained adipogenic potential,and upregulated the expression of DNA replication pathway components.

关键词： Immortalization Transfection Stem cell Epidural fat Proteomics

Suppression of pheromone biosynthesis and mating behavior by RNA interference of pheromone gland-specific fatty acyl reductase in Maruca vitrata

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Insect Science 2022年第4期29卷 1135-1144页

作者： wook hyun Cha Dae-Weon lee Department of Biosafety Kyungsung UniversityBusanRepublic of Korea Metabolomics Research Center for Functional Materials Kyungsung UniversityBusanRepublic of Korea

In moths,various enzymes,such as fatty acid synthases,fatty acyl desaturases,and fatty acyl reductases(FARs),are involved in pheromone *** particular,pheromone gland-specific FAR(pgFAR)plays an important role in converting the functional group from carboxylic to alcohol during pheromone biosynthesis.A novel pgFAR of Maruca vitrata,Mvi-pgFAR,was identified through transcriptome sequencing of its pheromone *** investigate the involvement of Mvi-pgFAR in pheromone biosynthesis,Mvi-pgFAR was cloned from the pheromone gland and suppressed by RNA interference(RNAi).Mvi-pgFAR harbored several conserved motifs related to NAD(P)H-binding,N-glycosylation,and adenosine/guanosine triphosphate *** analysis revealed that Mvi-pgFAR with other lepidopteran pgFARs formed an independent ***-pgFAR was specifically expressed only in the pheromone *** real-time polymerase chain reaction showed that the diurnal expression levels of Mvi-pgFAR in the pheromone gland were the highest at 2 h before the *** primarily confirming Mvi-pgFAR suppression by RNAi,(E,E)-10,12-hexadecadienal(E10E12-16:Ald),a major sex pheromone component,was quantified by gas *** Mvi-pgFAR was successfully suppressed,E10E12-16:Ald production was reduced by up to half of that of the control,and the mating rate was subsequently *** results demonstrate that Mvi-pgFAR downregulation can suppress mating behavior by changing the relative sex pheromone component ratio,suggesting that Mvi-pgFAR can be used as a novel control target.

关键词： (EE)-10,12-hexadecadienal gas chromatography Maruca viruta pgFAR RNAi sex pheromone

Breakthrough scalable synthesis of anti-coking Cs-Ni/CeO_(x)-Al_(2)O_(3) nanocatalysts for optimal dry reforming performance

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Nano Research 2025年第2期18卷 913-929页

作者： Kyung Hee Oh Shin wook Kang Jin Gyu lee Jung-Il Yang Byung-hyun Kim Chang Seop Hong Ji Chan Park Clean Fuel Research Laboratory Korea Institute of Energy ResearchDaejeon 34129Republic of Korea Department of Chemistry Korea UniversitySeoul 02841Republic of Korea Department of Chemical and Molecular Engineering Hanyang University ERICAAnsan 15588Republic of Korea Energy Engineering University of Science and TechnologyDaejeon 34113Republic of Korea

The dry reforming(DR)reaction is an eco-friendly process for producing synthesis gas(CO,H_(2))from greenhouse gases(CH_(4),CO_(2)).Despite advancements in various nickel(Ni)supported catalysts for this reaction,achieving high catalyst stability against carbon deposition and improving conversion rates remain significant *** this paper,we introduce a novel approach for synthesizing uniform Ni nanocatalysts with cesium(Cs)and cerium oxide(CeO_(x)).This synthesis is achieved using an automated device based on a co-melt infiltration *** method addresses the limitations of conventional catalyst synthesis,such as complex procedures,low reproducibility,and difficulties in scaling *** resulting catalysts contain uniformly small Ni particles,approximately 5 nm in size,with Cs and CeO_(x) evenly distributed throughout the alumina(Al_(2)O_(3))*** developed Ni/CeO_(x)-Al_(2)O_(3) and Cs Ni/CeOx-Al_(2)O_(3) nanocatalysts demonstrate improved conversion performance and stability under various DR *** improvement is attributed to the synergistic effect of Cs and CeO_(x),which creates a pathway to inhibit and remove carbon ***,these nanocatalysts exhibited superior resistance to carbon deposition compared to conventional Ni/Al_(2)O_(3) and commercial Ni catalysts under identical reaction conditions.

关键词： co-melt infitration nanocatalyst promoter dry reforming reaction coke resistance

Novel transparent high-entropy sesquioxide ceramics with high physicochemical plasma etching resistance

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JOURNAL OF ADVANCED CERAMICS 2025年第1期14卷 163-176页

作者： Shin, Yu-Bin Ham, Su Been Kim, Ha-Neul Kim, Mi-Ju Ko, Jae-Woong lee, Jae-wook Park, Young-Jo Kim, Jung-hyung lee, Hyo-Chang Jung, Young Hwa lee, Jung Woo Ma, Ho Jin Korea Inst Mat Sci Nano Mat Res Div Chang Won 51508 Gyeongsangnam South Korea Pusan Natl Univ Dept Mat Sci & Engn Pusan 46241 South Korea Korea Res Inst Stand & Sci Semicond Integrated Metrol Team Daejeon 34113 South Korea Korea Aerosp Univ Dept Semicond Sci Engn & Technol Goyang 10540 South Korea Korea Aerosp Univ Sch Elect & Informat Engn Goyang 10540 South Korea Pohang Accelerator Lab PLS II Beamline Div Pohang 37673 South Korea

High-entropy ceramics exhibit novel intrinsic properties. Hence, they have been explored for a wide range of applications ranging from thermal insulation and energy storage to advanced optical components. Recently, the semiconductor industry has faced a demand for higher-performance chips, necessitating higher aspect ratios in wafer fabrication and further miniaturization of linewidths. Therefore, novel materials with high plasma etching resistance and minimal contaminant generation are needed. The plasma-etching resistance displayed by high-entropy ceramics can be an innovative solution to this emerging challenge. In this study, we successfully fabricated single-phase high-entropy sesquioxide ceramics with high optical transparency, dense microstructure, and minimal residual pores. A structural analysis of the fabricated samples revealed a single-phase structure with excellent phase homogeneity. An evaluation of the plasma-etching resistance of high-entropy ceramics revealed for the first time a low etching rate of 8 nm/h compared with that of conventional plasma-resistant materials. These comprehensive characterizations of high-entropy ceramics indicate that they are promising candidates for significantly improving the production yield of semiconductors and for a wide range of potential applications, such as next-generation active optical ceramics.

关键词： high-entropy ceramics plasma etching resistance transparent ceramics sintering semiconductor manufacturing

Prospects for nucleic acid-based therapeutics against hepatitis C virus

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World Journal of Gastroenterology 2013年第47期19卷 8949-8962页

作者： Chang Ho lee Ji hyun Kim Seong-wook lee Department of Molecular Biology Institute of Nanosensor and BiotechnologyDankook UniversityYongin 448-701South Korea

In this review,we discuss recent advances in nucleic acid-based therapeutic technologies that target hepatitis C virus(HCV)*** the HCV genome is present exclusively in RNA form during replication,various nucleic acid-based therapeutic approaches targeting the HCV genome,such as ribozymes,aptamers,siRNAs,and antisense oligonucleotides,have been suggested as potential tools against *** acids are potentially immunogenic and typically require a delivery tool to be utilized as *** limitations have hampered the clinical development of nucleic acid-based ***,despite these limitations,nucleic acid-based therapeutics has clinical value due to their great specificity,easy and large-scale synthesis with chemical methods,and pharmaceutical ***,nucleic acid therapeutics are expected to broaden the range of targetable molecules essential for the HCV replication cycle,and therefore they may prove to be more effective than existing therapeutics,such as interferon-αand ribavirin combination *** review focuses on the current status and future prospects of ribozymes,aptamers,siRNAs,and antisense oligonucleotides as therapeutic reagents against HCV.

关键词： Hepatitis C virus Nucleic acid-based therapeutics Ribozyme Aptamer siRNA Antisense oligonucleotide

Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials Science & Technology 2022年第12期107卷 252-258页

作者： Seungchan Cho Junghwan Kim Ilguk Jo Jae hyun Park Jaekwang lee hyun-Uk Hong Bong Ho lee wook Ryol Hwang Dong-Woo Suh Sang-Kwan lee Sang-Bok lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

Bioinspired Multi-material Polyjet-printed Frog Robot for Synchronous and Asynchronous Swimming

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Journal of Bionic Engineering 2023年第3期20卷 923-933页

作者： Afaque Manzoor Soomro Jae-wook lee Fida Hussain Memon Faheem Ahmed Kashif Hussain Kyung hyun Choi Department of Mechatronics Engineering Jeju National UniversityJeju63243South Korea Department of Electrical Engineering Sukkur IBA UniversitySukkur65200Pakistan

This paper proposes the bioinspired soft frog robot. All printing technology was used for the fabrication of the robot. Polyjet printing was used to print the front and back limbs, while ultrathin filament was used to print the body of the robot, which makes it a complete soft swimming robot. Dual thrust generation approach has been proposed by embedding the main muscle and antagonistic muscle in all the limbs, which enables it to attain high speed (18 mm/s), significant control to swim in dual mode (synchronous and asynchronous modes). To achieve the swimming motion of frog, four SMA (BMF 300) muscle wires were used. The frog robot is named as (FROBOT). The hind limbs are 60 mm long and 10 mm thick on average, while the front limbs are 35 mm long and 7 mm thick. Model-based design and rigorous analysis of the dynamics of real frogs have allowed FROBOT to be developed to swim at a level that is remarkably consistent with real frogs. Electrical and mechanical characteristics have been performed. In addition, the test data were further processed using TRACKER to analyze angle, displacement and velocity. FROBOT (weighs 65 g) can swim at different controllable frequencies (0.5–2 Hz), can rotate in any direction on command from custom built LabVIEW software allowing it to swim with speed up to 18 mm/s on deep water surface (100 cm) with excellent weight balance.

关键词： Bioinspired Soft robotics Frog FROBOT Asynchronous swimming