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Laser‑Induced and MOF‑Derived Metal Oxide/Carbon Composite for Synergistically Improved Ethanol Sensing at Room temperature

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Nano-Micro Letters 2024年第6期16卷 210-220页

作者： Hyeongtae Lim Hyeokjin Kwon Hongki Kang Jae Eun Jang hyuk‑jun Kwon Department of Electrical Engineering and Computer Science DGISTDaegu 42988South Korea Convergence Research Advanced Centre for Olfaction DGISTDaegu 42988South Korea

Advancements in sensor technology have significantly enhanced atmospheric ***,metal oxide and carbon(MO_(x)/C)hybrids have gained attention for their exceptional sensitivity and room-temperature sensing ***,previous methods of synthesizing MO_(x)/C composites suffer from problems,including inhomogeneity,aggregation,and challenges in ***,we introduce a refined method that employs a metal–organic framework(MOF)as a precursor combined with direct laser *** inherent structure of MOFs ensures a uniform distribution of metal ions and organic linkers,yielding homogeneous MO_(x)/C *** laser processing facilitates precise micropatterning(<2μm,comparable to typical photolithography)of the MO_(x)/C *** optimized MOF-derived MO_(x)/C sensor rapidly detected ethanol gas even at room temperature(105 and 18 s for response and recovery,respectively),with a broad range of sensing performance from 170 to 3,400 ppm and a high response value of up to 3,500%.Additionally,this sensor exhibited enhanced stability and thermal resilience compared to previous MOF-based *** research opens up promising avenues for practical applications in MOF-derived sensing devices.

关键词： Metal-organic frameworks Metal oxide Carbon composite Laser Gas sensor

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Chemical and mechanical properties of stainless, environment-friendly, and nonflammable Mg alloys (SEN alloys): A review

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Journal of Magnesium and Alloys 2024年第3期12卷 841-872页

作者： Jong Un lee Hyun Ji Kim Sang-Cheol Jin Ye Jin Kim Young Min Kim Bong Sun You jun Ho Bae Sung hyuk Park Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Missile Research Institute Agency for Defense DevelopmentDaejeon 34060Republic of Korea

This review article provides overall understanding of stainless,environment-friendly,and nonflammable Mg alloys(SEN alloys)recently developed at the Korea Institute of Materials *** alloys are produced by adding small amounts of Ca and Y(each<1 wt%)into commercial Mg–Al based alloys,resulting in exceptional ignition and corrosion resistances and impressive mechanical *** main advantages of SEN alloys are as follows.(1)A dense multi-oxide layer of SEN alloys comprising MgO,CaO,and Y_(2)O_(3) impedes the outward dispersion of Mg vapor and the inward penetration of O_(2) during oxidation,thereby enhancing the oxidation and ignition resistances.(2)The presence of Ca-and Y-based second-phase particles in SEN alloys can enhance their corrosion resistance because Ca-containing particles prevent the spread of corrosion,and the replacement of Al-containing particles with less noble ones containing Y(e.g.,Al–Mn–Y or Al–Y particles)retards corrosion.(3)The addition of minor amounts of Ca and Y renders excellent mechanical properties due to improved strengthening *** enhanced properties are attributed to more pronounced dynamic recrystallization and grain refining behaviors caused by the second-phase particles during extrusion.(4)Despite the presence of various types of second-phase particles,the fatigue properties of SEN9 alloys are similar to those of commercial AZ91 alloys.(5)Simultaneous introduction of Ca and Y suppresses the formation of Mg17Al12 discontinuous precipitates during aging,leading to the enhanced elongation of aged SEN alloys.(6)Adding mischmetal into the SEN9 alloy leads to a six-fold enhancement in ***,the studies conducted on SEN alloys demonstrate their excellent ignition and corrosion resistances and mechanical properties,which broaden the industrial applications of Mg alloys by addressing their inherent weaknesses.

关键词： SEN magnesium alloy Corrosion resistance Ignition resistance Mechanical properties Extrudability.

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常山根水提物在大鼠肝脏中的抗炎作用

Acta Pharmacologica Sinica 2003年第2期24卷 127-132页

作者： CHOI Byung-Tae lee jun-hyuk KO Woo-Shin KIM Young-Hee CHOI Yung-Hyun KANG Ho-Sung KIM Han-Do Department of Anatomy College of Oriental Medicaine dongEui Universtity Busan 614-052 Kore. Department of Oriental Medicine College of Oriental Medicine Research Institute of Oriental Medicine Dong-Eui University Busan 614-052 Department of Oriental Medicine College of Oriental Medicine Research Institute of Oriental Medicine Dong-Eui University Busan 614-052 Department of Molecular Biology College of Natural Sciences Pusan National University Busan 609-735 Korea Department of Molecular Biology College of Natural Sciences Pusan National University Busan 609-735 Korea Department of Molecular Biology College of Natural Sciences Pusan National University Busan 609-735 Korea Department of Molecular Biology College of Natural Sciences Pusan National University Busan 609-735 Korea

AIM: To study the anti-inflammatory effects of aqueous extract from Dichroafebrifuga root (AEDF) for suppression in the process of lipopolysaccharide (LPS)-induced sepsis in the rat liver. METHODS: The inhibitory effect of AEDF on the alteration of inflammatory proteins was investigated by Western blot and immunohistochemical analysis. RESULTS: Western blot analysis showed that the level of nuclear factor (NF)-κBp65 was markedly up-regulated and (Ⅰ)κBα was down-regulated by LPS (8 mg/kg) challenge. However, AEDF 100 mg/kg inhibited induction of NF-κBp65 and degradation of Ⅰ-κBα in the liver of LPS-challenged rats. Immunohistochemical analysis showed that while the expression of the NF-κBp65, tumor necrosis factor (TNF)-α, and inducible nitric oxide synthase(iNOS) tended to increase, that of Ⅰ-κBα was decreased in the hepatocytes of rats challenged with LPS. A slight decline of NF-κBp65, TNF-α, and iNOS, but an increase of Ⅰ-κBα were observed in the hepatocytes of the rats pretreated with AEDF. CONCLUSION: AEDF may act as a therapeutic agent for inflammatory disease through a regulation of inflammation-related proteins.

关键词：常山炎症脂多糖类核因子-кB IкB 肿瘤坏死因子一氧化氮合酶

Real-Time Tunable Gas Sensing Platform Based on SnO_(2) Nanoparticles Activated by Blue Micro-Light-Emitting Diodes

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Nano-Micro Letters 2024年第12期16卷 103-119页

作者： Gi Baek Nam jung-El Ryu Tae Hoon Eom Seung Ju Kim jun Min Suh Seungmin lee Sungkyun Choi Cheon Woo Moon Seon Ju Park Soo Min lee Byungsoo Kim Sung hyuk Park Jin Wook Yang Sangjin Min Sohyeon Park Sung Hwan Cho hyuk Jin Kim Sang Eon jun Tae Hyung lee Yeong Jae Kim Jae Young Kim Young Joon Hong Jong-In Shim Hyung-Gi Byun Yongjo Park Inkyu Park Sang-Wan Ryu Ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Research Laboratory of Electronics Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeMA 02139USA Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Display Materials Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Department of Photonics and Nanoelectronics BK21 FOUR ERICA-ACE CenterHanyang University ERICAAnsan 15588Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Electronics Information and Communication EngineeringKangwon National UniversitySamcheok 25913Republic of Korea Advance Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Physics Chonnam National UniversityGwangju 500-757Republic of Korea

Micro-light-emitting diodes(μLEDs)have gained significant interest as an activation source for gas sensors owing to their advantages,including room temperature operation and low power ***,despite these benefits,challenges still exist such as a limited range of detectable gases and slow *** this study,we present a blueμLED-integrated light-activated gas sensor array based on SnO_(2)nanoparticles(NPs)that exhibit excellent sensitivity,tunable selectivity,and rapid detection with micro-watt level power *** optimal power forμLED is observed at the highest gas response,supported by finite-difference time-domain ***,we first report the visible light-activated selective detection of reducing gases using noble metal-decorated SnO_(2)*** noble metals induce catalytic interaction with reducing gases,clearly distinguishing NH3,H2,and ***-time gas monitoring based on a fully hardwareimplemented light-activated sensing array was demonstrated,opening up new avenues for advancements in light-activated electronic nose technologies.

关键词： Micro-LED Gas sensor array Low power consumption Metal decoration Real-time detection

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High Na-ion conductivity andmechanical integrity of anion-exchanged polymeric hydrogel electrolytes for flexible sodium ion hybrid energy storage

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SusMat 2024年第1期4卷 140-153页

作者： jungWoo Hong Harpalsinh H.Rana Jeong Hee Park jun Su Kim Sang Joon lee Gun Jang Tae Hoon Kang Kang Ho Shin Sang Ha Baek Wooseok Yang Kwang Ho Kim Ju-hyuk lee Ho Seok Park School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Clean Energy Research Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea KIST-SKKU Carbon-Neutral Research Center Sungkyunkwan University(SKKU)SuwonRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea COSMOS LAB/92 Jomaru-ro 385beon-gilBucheon-siRepublic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

The polymeric gel electrolytes are attractive owing to their higher ionic conductivities than those of dry polymer electrolytes and lowered water activity for enlarged potential ***,the ionic conductivity and mechanical strength of the Na-ion conducting polymeric gel electrolytes are limited by below 20 mS cm−1 and 2.2 ***,we demonstrate Na-ion conducting and flexible polymeric hydrogel electrolytes of the chemically coupled poly(diallyldimethylammonium chloride)-dextrin-N,N′-methylene-bisacrylamide film immersed in NaClO_(4) solution(ex-DDA-Dex+NaClO_(4))for flexible sodium-ion hybrid capacitors(f-NIHC).In particular,the anion exchange reaction and synergistic interaction of ex-DDA-Dex with the optimum ClO_(4)−enable to greatly improve the ionic conductivity up to 27.63 mS cm−1 at 25◦C and electrochemical stability window up to 2.6 V,whereas the double networking structure leads to achieve both the mechanical strength(7.48 MPa)and softness of hydrogel ***,the f-NIHCs with the ex-DDA-Dex+NaClO_(4) achieved high specific and high-rate capacities of 192.04 F g^(−1)at 500 mA g^(−1)and 116.06 F g^(−1)at 10000 mA g^(−1),respectively,delivering a large energy density of 120.03Wh kg^(−1)at 906Wkg^(−1)and long cyclability of 70%over 500 cycles as well as demonstrating functional operation under mechanical stresses.

关键词： anion exchange chemistry flexible energy storage hybrid energy storage hydrogel electrolytes renewable electrolytes sodium storage

Vomiting-induced pharyngeal perforation during bowel preparation for colonoscopy:A case report

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World Journal of Clinical Cases 2024年第18期12卷 3615-3621页

作者： Geonhee Kim Won hyuk lee Seokin Kang jung Rock Moon Yoon Suk lee jun hyuk Son Nam-Hoon Kim Jong Wook Kim Department of Internal Medicine Ilsan Paik HospitalInje University College of MedicineGoyang 10380South Korea

BACKGROUND Effective bowel cleansing is essential for a successful ***,such as polyethylene glycol,are commonly used for bowel *** is a frequent complication during bowel preparation,and forceful vomiting can potentially lead to esophageal perforation,as reported in several previous ***,pharyngeal perforation during bowel preparation has not been previously ***,we present a case of pharyngeal perforation induced by forceful vomiting during bowel *** SUMMARY A 38-year-old man with a history of hypertension,dyslipidemia,diabetes mellitus,and end-stage renal disease on hemodialysis was admitted for evaluation of recurrent abdominal *** patient complained of sudden pain in the neck,throat,and anterior chest following forceful vomiting during bowel *** examination revealed crepitus under the skin of the neck and anterior chest on palpation,and upper gastrointestinal endoscopy revealed pharyngeal *** perforation site was located above the upper esophageal sphincter,which distinguished it from Boerhaave’s *** medical management was chosen after consultation with a thoracic surgeon and an otolaryngologist,considering the patient's mild symptoms,stable vital signs,and the small size of the lesion;the perforation resolved without endoscopic or surgical *** patient was discharged from hospital two weeks after the *** Despite its rarity,pharyngeal perforation should be considered a potential complication of bowel preparation for colonoscopy.

关键词： Colonoscopy Pharynx Polyethylene glycols Spontaneous perforation Case report

Researches for higher electrical conductivity copper-based materials

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cMat 2024年第1期1卷 92-107页

作者： Wen-Jing Zhang Lue Huang Xu-jun Mi Hao-Feng Xie Xue Feng Jee hyuk Ahn State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.BeijingChina GRIMAT Engineering Institute Co. Ltd.BeijingChina General Research Institute for Nonferrous Metals BeijingChina School of Materials Science and Engineering South China University of TechnologyGuangzhouChina Extreme Materials Institute Korea Institute of Materials and ScienceChangwonKorea

Copper and copper-based materials are widely used in power electronics,auto-mobiles,mechanical manufacturing and high-tech manufacturing fields such as aerospace,telecommunications and integrated circuits owing to their compre-hensive advantages in mechanical,electrical conductivity and processing *** the rapid development of technology,many emerging technical fields have introduced more challenging requirements for the electrical conductivity of *** article reviews the research status of high-conductivity copper-based materials and introduces three methods to improve electrical conductivity,including purification,alloying and addition of nanocarbon *** sum-marise the advantages,disadvantages and future development trends of methods for improving copper *** key to producing high-conductivity copper-based materials is development of low-cost,continuous and stable processes.

关键词： copper matrix composite high-strength and high-electrical-conductivity copper alloy higher electrical conductivity pure copper material

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张玉宁 “狮子王”的惟一对手

体育世界(学术版) 2000年第23期 38-38页

作者： lee hyuk jun

亚洲杯上"狮子王"李东国拒绝了伤腿的诱惑成就了自己亚洲第一中锋的霸业,但是我们不得不承认此次中国队的头号杀手张玉宁的缺阵使得李东国的身影显得有些落寞,早在去年奥运会外围赛的时候,我们的国奥队就在相当艰险的情况下以一个球险... 详细信息

亚洲杯上"狮子王"李东国拒绝了伤腿的诱惑成就了自己亚洲第一中锋的霸业,但是我们不得不承认此次中国队的头号杀手张玉宁的缺阵使得李东国的身影显得有些落寞,早在去年奥运会外围赛的时候,我们的国奥队就在相当艰险的情况下以一个球险胜由张玉宁领衔的中国队,无论是在蚕室体育场还是在客场中国上海,张玉宁的表现都告诉我们近十年内他将是有资格向"狮子王"的地位挑衅的实力派第一人。

关键词：张玉宁韩国地位中华人民共和国职业联赛亚洲杯东国浦项进球狮子王对手球员球队

Schottky barrier modulation of bottom contact SnO_(2) thin-film transistors via chloride-based combustion synthesis

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Journal of Materials Science & Technology 2023年第17期148卷 199-208页

作者： Bongho Jang junhee lee Hongki Kang Jaewon Jang hyuk-jun Kwon Department of Electrical Engineering and Computer Science DGISTDaegu 42988South Korea School of Electronic and Electrical Engineering Kyungpook National UniversityDaegu 41566South Korea School of Electronics Engineering Kyungpook National UniversityDaegu 41566South Korea Convergence Research Advanced Centre for Olfaction DGISTDaegu 42988South Korea

The enhanced carrier flow at the interface between Au and SnO_(2)semiconductors,which initially form Schottky contacts,is realized using chloride-based combustion ***-based combustion sys-tems can achieve chlorine(Cl)doping effects as well as conversion to crystalline SnO_(2)films at clearly lower temperatures(∼250℃)than conventional *** to the Cl doping effect,the high carrier concentration can induce thin potential barriers at the metal/semiconductor(MS)junctions,resulting in carrier injection by *** a result,compared to conventional SnO_(2)thin-film transistors,the de-vices fabricated by combustion synthesis exhibit significantly improved electrical performance with field-effect mobility of 6.52 cm 2/Vs(∼13 times),subthreshold swing of 0.74 V/dec,and on/offratio of∼10^(7)below 300℃.Furthermore,because of the enhanced tunneling carriers induced by the narrowed barrier width,the Schottky barriers are significantly reduced from 0.83 to 0.29 eV(65%decrease)at 250℃and from 0.42 to 0.17 eV(60%decrease)at 400℃.Therefore,chloride-based combustion synthesis can con-tribute to developing SnO_(2)-based electronics and flexible devices by achieving both high-quality oxide films and improved current flow at the MS interface with low-temperature annealing.

关键词： SnO_(2) Combustion Sol-gel Schottky contact Thin-film transistors