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Journal of Materials Science & Technology 2023年第16期147卷 224-240页

作者： Younghoon Kim Min-Jae choi Jongmin choi Department of Chemistry Kookmin UniversitySeoul02707Republic of Korea Department of Chemical and Biochemical Engineering Dongguk UniversitySeoul04620Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu42988Republic of Korea

Colloidal quantum dots(CQDs)are promising semiconducting materials,which can be used as a photoactive layer in various optoelectronic applications,because of their size-tunable bandgap energy,solution processability,and excellent optical and optoelectronic *** particular,these features have generated great interest in the development of CQD solar cells and led to a rapid increase in their power conversion *** improvements were enabled by many innovative approaches in terms of CQD’s surface chemistry and device architecture *** this review,a critical overview of the research progress in CQD solar cells is presented with a focus on the strategies adopted for achieving record efficiency in CQD solar *** strategies include the use of organic/inorganic surface ligands,pre-and post-treatment of CQDs,and solid-state/solution-phase ligand ***,we provide an understanding of the research history to inspire the rational design of next-generation CQD optoelectronic devices,such as solar cells,light-emitting diodes,and *** research on the development of infrared CQD solar cells as complementary platforms to other solar cell technologies is also critically discussed to provide another perspective on CQD technologies.

关键词： Quantum dot Lead sulfide Ligand exchange Colloidal ink Infrared light Solar cell

Preoperative colonoscopy through the colonic stent in patients with colorectal cancer obstruction

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World Journal of Gastroenterology 2014年第30期20卷 10570-10576页

作者： Jin Su Kim kang Moon Lee Sang Woo Kim Eun Jung Kim Chul Hyun Lim Seong Taek Oh Myung Gyu choi Kyu Yong choi Division of Gastroenterology Department of Internal MedicineCatholic University of Korea College of MedicineSeoul 137-701South Korea Department of surgery Catholic University of Korea College of MedicineSeoul 137-701South Korea

AIM: To evaluate the feasibility of a preoperative colonoscopy through a self-expendable metallic stent (SEMS) and to identify the factors that affect complete colonoscopy.

关键词： Colon cancer Stent Preoperative colonoscopy Complete colonoscopy

Anti-quorum sensing and anti-biofilm formation activities of plant extracts from South Korea

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Asian Pacific Journal of Tropical Biomedicine 2018年第8期8卷 411-417页

作者： Okhee choi Dong-Wan kang Su Kyung Cho Yeyeong Lee Byeongsam kang Juyoung Bae Seunghoe Kim Jeong Hoon Lee Seung Eun Lee Jinwoo Kim Institute of Agriculture & Life Science Gyeongsang National University Gyeonsangnam-do Agriculture Extension Services Department of Plant Medicine Gyeongsang National University Division of Applied Life Science Gyeongsang National University National Institute of Horticultural and Herbal Science Rural Development Administration

Objective: To investigate anti-quorum sensing(anti-QS) and anti-biofilm formation(antiBF) activities of the ethanol extracts of 388 plants. Methods: The anti-QS activity of the plant extracts was evaluated by disc-diffusion assays using the bio-reporter strain, Chromobacterium violaceum CV017. Pseudomonas aeruginosa PAO1, Yersinia enterocolitica ATCC 9610, and Agrobacterium tumefaciens C58, which possess QS systems, were used to evaluate the antiBF activity of the plant extracts. Results: Among 388 plant extracts, the Cornus controversa(C. controversa) and Cynanchum wilfordii extracts exhibited the strongest anti-QS activity. The C. controversa extract exhibited anti-BF activity against Pseudomonas aeruginosa, Yersinia enterocolitica and Agrobacterium tumefaciens, whereas the Cynanchum wilfordii extract exhibited no anti-BF activity against Pseudomonas aeruginosa. In addition, the C. controversa extract suppressed soft rot of cabbage. Conclusions: The C. controversa extract inhibits bacterial QS and BF, and is capable of controlling soft rot. Therefore, this extract has potential for the prevention and treatment of bacterial infections and for the development of alternatives to antibiotics.

关键词： Plant extracts Quorum sensing Biofilm formation Cornus controversa

Colourimetric redox-polyaniline nanoindicator for in situ vesicular trafficking of intracellular transport

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Nano Research 2015年第4期8卷 1169-1179页

作者： Eun Bi choi Jihye choi Seo Ryung Bae Hyun-Ouk Kim EunjiJang Byunghoon kang Myeong-Hoon Kim Byeongyoon Kim Jin-Suck Suh Kwangyeol Lee Yong-Min Huh Seungjoo Haam Department of Chemical and Biomolecular Engineering College of Engineering Yonsei University Seou1120-749 Republic of Korea Department of Radiology College of Medicine Yonsei University Seou1120-752 Republic of Korea Department of Chemistry Korea University Seou1136-701 Republic of Korea

Vesicular pH modulates the function of many organelles and plays a pivotal role in cell metabolism processes such as proliferation and apoptosis. Here, we introduce a simple colorimetric redox-polyaniline nanoindicator, which can detect and quantify a broader biogenic pH range with superior sensitivity compared to pre-established trafficking agents employing one-dimensional turn-on of the fluorescence resonance-energy-transfer （FRET） signal. We fabricated polyaniline- based nanoprobes, which exhibited convertible transition states according to the proton levels, as an in situ indicator of vesicular transport pH. Silica-coated Fe304-MnO heterometal nanoparticles were synthesised and utilised as a metal oxidant to polymerise the aniline monomer. Finally, silica-coated polyaniline nanoparticles with adsorbed cyanine dye fluorophores Cy3 and Cy7 （FPSNIcyB and FPSNIcy7） were fabricated as proton-sensitive nanoindicators. Owing to the selective quenching induced by the local pH variations of vesicular transport, FPSNIcy3 and FPSNIcy7 demonstrated excellent intracellular trafficking and provided sensitive optical indication of minute proton levels.

关键词： redox pH intraceUular compartments organic quencher conducting polymer nanoindicator

Direct photoelectrochemical nitrate synthesis in an acidic electrolyte from N_(2)by a hole coupled oxygen atom transfer process

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Journal of Energy Chemistry 2024年第12期99卷 654-660页

作者： Zhongyuan Ma Jiaming Miao Kwanghee Kim Gyuyong Jang Youngmoon choi Seongjae Im Joonhee kang Kan Zhang Jong Hyeok Park Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 120-749Republic of Korea School of Materials Science and Engineering and School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 20094JiangsuChina Department of Nanoenergy Engineering Pusan National UniversityBusan 46241Republic of Korea

Ammonia is an important chemical for pharmaceutical,agriculture,industry,as well as energy production et ***,the industrial production of ammonia using the Haber-Bosch process is energy-intensive,which stimulates us to explore a cost-effective and low-carbon footprint way for the synthesis of ammonia[1–3].Electrochemical(EC)synthesis of ammonia from an aqueous N_(2)reduction reaction(NRR)has gained significant attention in recent years,while the high dissociation energy of the N≡N bond(941 kJ/mol),as well as higher over-potential than hydrogen evolution reaction(HER),cause a lower efficiency[4].

关键词： Nitrogen oxidation Tungsten oxide Facet engineering Photoelectrochemical Oxygen atom transfer

Could Military Commanders’ Good LeadershipInfluence Subordinates’ Smartphone Overdependence? A Serial Mediation Analysis

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International Journal of Mental Health Promotion 2023年第11期25卷 1187-1195页

作者： Seungju Hyun Xyle Ku Sungrok kang Yoonyoung choi Jaewon Ko Hyunyup Lee Department of Psychology Korea Military AcademySeoul01805Korea Department of Psychology Seoul National UniversitySeoul08826Korea

Owing to the ubiquitous use of smartphones by soldiers, military researchers have an increasing interest in potentially problematicside effects such as smartphone overdependence. This raises a question regarding the psychological mechanisms underlying thepotentially self-damaging use of smartphones. Here, we address this question by analyzing how heterogeneity in commander’sgood leadership explains subordinate soldiers’ differences in self-control and smartphone use. Specifically, we found thatsubordinate soldiers who thought their commander's leadership was good were self-regulated, less dependent on smartphones,less stressed, and finally had good mental health. This result indicates that commander’s good leadership can be used toestimate whether subordinate soldiers exert control over their impulses and use their smartphones properly. Thus, the currentfindings help to identify external factors that lead to a better understanding of problematic smartphone use and can potentiallyhelp to design appropriate preventive mechanisms or interventions that target commander’s good leadership.

关键词： Military commander leadership smartphone overdependence soldier mental health

Antimicrobial activity and synergism of Sami-Hyanglyun-Hwan with ciprofloxacin against methicillin-resistant Staphylococcus aureus

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Asian Pacific Journal of Tropical Medicine 2015年第7期8卷 536-540页

作者： Jang-Gi choi Ji-Young choi Su-Hyun Mun Ok-Hwa kang Preeti Bharaj Dong-Won Shin Myong-Soo Chong Dong-Yeul Kwon Department of Oriental Pharmacy College of Pharmacy Wonkwang University Wonkwang Oriental Medicines Research Institute Center of Excellence in Infectious Disease Research Department of Biomedical Sciences Paul L. Foster School of Medicine Texas Tech University Health Sciences Center Department of Third Medicine Professional Graduate School of Oriental Medicine Wonkwang University BK21 Plus Team Professional Graduate School of Oriental Medicine Wonkwang University Department of Oriental Medicine Resources Sunchon National University

Objective: To investigate the antibacterial activity of SHHextracted with either water or ethanol against methicillin-resistant Staphylococcus aureus(MRSA) and combinatory antimicrobial effect with ciprofloxacin(CIP) by time kill assay and checkerboard dilution test. Methods: The antibacterial activity determined by broth dilution method indicated that the antibacterial activity of Sami-Hyanglyun-Hwan(SHH) water extract(SHHW) and SHH ethanol extract(SHHE) ranged from 250 to 2000 μg/m L and 125 to 1000 μg/m L against MRSA, respectively. Results: In the checkerboard method, the combinations of SHHE with CIP had a partial synergistic or synergistic effect against MRSA. The time-kill curves showed that a combined SHHE and CIP treatment reduced the bacterial counts dramatically after 24 h. Conclusions: The present study demonstrates the therapeutic ability of SHHE against MRSA infections.

关键词： Sami-Hyanglyun-Hwan Methicillin-resistant Staphylococcus aureus Ciprofloxacin Synergy

Development and characterization of novel polymorphic microsatellite markers for the Korean freshwater snail Semisulcospira coreana and cross-species amplification using next-generation sequencing

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Journal of Oceanology and Limnology 2020年第2期38卷 503-508页

作者： Yeon Jung PARK Mi Nan LEE Eun-Mi KIM Jung Youn PARK Jae Koo NOH Tae-Jin choi Jung-Ha kang Biotechnology Research Division National Institute of Fisheries ScienceBusan 46083Republic of Korea Department of Microbiology Pukyoung National UniversityBusan 48513Republic of Korea

Korean freshwater snails of the genus Semisulcospira are widely distributed across East *** has been a very popular nutritional food in Korea,and is an ecologically important water quality indicator because it lives only in clean ***,no microsatellite markers have been generated to study the population genetic diversity of this *** the present study,we developed and characterized 18 novel microsatellite loci from Semisulcospira coreana genomic *** microsatellites were isolated using 454 GS-FLX titanium sequencing and 18 markers were used for genotyping in *** addition,we also tested the cross-species transferability of the microsatellite markers in four additional Semisulcospira *** identified 18 polymorphic loci and the number of alleles per loci,and their polymorphism information content values ranged from 2 to 17 and 0.203 to 0.902,*** observed and expected heterozygosities of the loci ranged from 0.063 to 0.924 and 0.226 to 0.924,*** to the analysis of the cross-species transferability of these markers,four species,***,***,***,and ***,showed a very high transferability(80%–85%).These results show that this set of nuclear markers could be useful for population genetics studies of this species and closely related species.

关键词： Semisulcospira next-generation sequencing(NGS) microsatellite markers cross-species transferability

One-step printable platform for high-efficiency metasurfaces down to the deep-ultraviolet region

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Light(Science & Applications) 2023年第4期12卷 551-557页

作者： Joohoon Kim Wonjoong Kim Dong Kyo Oh Hyunjung kang Hongyoon Kim Trevon Badloe Seokwoo Kim Chanwoong Park Hojung choi Heon Lee Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea NationallInstitute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

A single-step printable platform for ultraviolet(UV)metasurfaces is introduced to overcome both the scarcity of low-loss UV materials and manufacturing limitations of high cost and low *** dispersing zirconium dioxide(ZrO_(2))nanoparticles in a UV-curable resin,ZrO_(2)nanoparticle-embedded-resin(nano-PER)is developed as a printable material which has a high refractive index and low extinction coefficient from near-UV to *** ZrO_(2)nano-PER,the UV-curable resin enables direct pattern transfer and ZrO_(2)nanoparticles increase the refractive index of the composite while maintaining a large *** this concept,UV metasurfaces can be fabricated in a single step by nanoimprint *** a proof of concept,UV metaholograms operating in near-UV and deep-UV are experimentally demonstrated with vivid and clear holographic *** proposed method enables repeat and rapid manufacturing of UV metasurfaces,and thus will bring UV metasurfaces more close to real life.

关键词： resin high enable

Evaluation of Mechanical Properties According to Nb Content of High Strength Steel Manufactured in VIM

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Journal of Materials Science & Technology 2008年第5期24卷 793-796页

作者： Byung-Hui choi Byung-Ki choi Department of Mechanical Engineering Graduate SchoolChosun UniversityKorea Department of Mechanical Engineering Chosun UniversityGwang-ju 501-750Korea

As the aircraft and aerospace industry and the automobile industry are developed, the demand of reliable materials with high strength and high toughness is steadily increased. The grain miniature method which improves the ductility and the toughness simultaneously under high strength is the miniature of the casting microstructure. In this paper, the Nb which affects the austenite grain miniature is added by 0.00%, 0.03% and 0.06% in this steel and the ingot is manufactured in a vacuum induction melting furnace （VIM）. The casting microstructure and the mechanical property of the maraging steel according to Nb contents are analyzed by conducting the solution annealing and the age hardening after hot rolling. In this result, a specimen containing 0.03% Nb is most miniature. When it does the long time age hardening, the precipitation estimated as the carbide is appeared. The mechanical properties are excellent if a specimen containing 0.06% Nb does the age hardening during 8 h in 482℃.

关键词： High strength steel Maraging steel Nb Vacuum induction melting furnace (VIM)