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Revolutionizing Thermal Stability and Self‑Healing in Pressure Sensors:A Novel Approach

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Advanced Fiber Materials 2023年第6期5卷 2028-2039页

作者： Su Bin Choi Jagan Singh Meena Jong‑woong kim Department of Smart Fab Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Research Center for Advanced Materials Technology Core Research InstituteSungkyunkwan UniversitySuwon 16419Republic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Soft electronics,which require mechanical elasticity,rely on elastic materials that have both a small Young’s modulus and a large elastic strain *** materials,however,are prone to damage when stress accumulates,presenting a significant challenge for soft *** address this issue,the integration of self-healing functionality into these materials appears to be a promising *** covalent bond chemistry has been utilized to design high-strength polymers with controllable ***,the temperature needed to trigger self-healing may induce thermal damage to other parts of the *** contrast,if the self-healing temperature is reduced,the device might suffer damage when exposed to temperatures exceeding the self-healing point due to the low stability of the polymer at high *** challenges highlight the need for materials that can self-heal at low temperatures while maintaining thermal stability at high *** response to this challenge,we propose a novel approach that involves forming a microfibrous network using polycaprolactone(PCL),a material with a low melting temperature of 60°C that is widely utilized in shape memory and self-healing *** fabricated the conductive fiber by encapsulating a microfiber PCL network with MXene *** MXene nanosheets were seamlessly coated on the PCL fiber’s surface to prevent shape deformation at high ***,they exhibited high thermal conductivity,facilitating rapid internal heat ***,the MXene/PCL microfiber networks demonstrated self-healing capabilities at 60°C and thermal stability above 200°*** makes them potentially suitable for stretchable,self-healing electronic devices that need to withstand high temperatures.

关键词： Fibers MXene Self-healing Pressure sensor Thermal stability Electrospinning

Advanced heterolytic H_(2) adsorption of K-added Ru/MgO catalysts for accelerating hydrogen storage into aromatic benzyltoluenes

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Journal of Energy Chemistry 2022年第8期31卷 333-343,I0009页

作者： Tae Wan kim Hwiram Jeong Yeongin Jo Dongun kim Ji Hoon Park Seok Ki kim Young-woong Suh Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Environmental&Sustainable Resources Research Center Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Department of Chemical Engineering Ajou UniversitySuwon 16499Republic of Korea

Herein,we report a highly active K-added Ru/MgO catalyst for hydrogen storage into aromatic benzyltoluenes at low temperatures to advance liquid organic hydrogen carrier *** hydrogenation activity of Ru/K/MgO catalysts exhibits a volcano-shaped dependence on the K content at the maximum with 0.02 wt%.This is in good agreement with the strength and capacity of H_(2) adsorption derived from basicity,despite a gradual decrease in the textural property and the corresponding increase in the Ru particle size with increasing the K *** functional theory calculations show that heterolytic hydrogen adsorption properties(strength and polarization)are facilitated up to a specific density of K on the Ru–MgO interface and excessive K suppresses heterolytic H_(2) adsorption by direct interaction between K and hydrogen,assuring the hydrogenation activity and H_(2) adsorption capability of Ru/K/MgO ***,the Ru/K/MgO catalyst,when K is added in an optimal amount,is highly effective to accelerate hydrogen storage kinetics at low temperatures owing to the enhanced heterolytic H_(2) adsorption.

关键词： Chemical hydrogen storage Supported Ru catalysts Ru–MgO interface Heterolytic H_(2)adsorption Charge transfer Potassium promotion

Microstructure and texture evolution of Ti-Nb-Si based alloys for biomedical applications

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Rare Metals 2006年第z2期25卷 163-167页

作者： kim Won-Yong kim han-Sol Advanced Materials R&D Division Korea Institute of Industrial Technology Incheon 406-130 Korea

Microstructure and texture of Ti-Nb-Si based alloys, prepared by water quenching from β-phase field, cold rolling and recrystallization heat treatment followed by water quenching, were investigated in terms of optical microstructure and analysis of X-ray pole figure result. In as-quenched sample, relatively random distribution of pole figure was detected without showing a specific texture component. In as-cold rolled sample, however, it is found well-developed several texture components consisting of rotated cube, α-fiber and γ-fiber texture components which are frequently observed in bcc-structured metals and alloys were found. Therefore, texture components developed in the present alloys are closely related to the deformation of β-phase even though small amount of α″ phase co-exist in the microstructure. In recrystallized sample, α-fiber texture component is weakly detected while the other texture components, rotated cube and γ-fiber components, appears to be relatively unchanged. No additional texture components were detected besides those texture components observed in the cold rolled samples.

关键词： Ti-Nb-Si based alloys microstructure texture

Comparative study of tensile and high-cycle fatigue properties of extruded AZ91 and AZ91-0.3Ca-0.2Y alloys

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Journal of Materials Science & Technology 2021年第34期93卷 41-52页

作者： Ye Jin kim Young Min kim Seong-Gu Hong Dae woong kim Chong Soo Lee Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Implementation Research Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Division of Industrial Metrology Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Energy Infra Material Measure Team Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Graduate Institute of Ferrous Technology Pohang University of Science and Technology.Pohang 37673Republic of Korea

Mg-Al-Zn-Ca-Y alloys with excellent ignition and corrosion resistances—termed SEN alloys(where the letters"S,""E,"and"N"stand for stainless,environmentally friendly,and non-flammable,respectively)—have been developed *** this study,the microstructure,tensile properties,and high-cycle fatigue properties of an extruded Mg-9.0Al-0.8Zn-0.1Mn-0.3Ca-0.2Y(SEN9)alloy are investigated and compared with those of a commercial Mg-9.0Al-0.8Zn-0.1Mn(AZ91)alloy extruded under the same *** the extruded SEN9 alloy and the extruded AZ91 alloy have a fully recrystallized structure comprising equiaxed grains,but the former has a smaller average grain size owing to the promoted dynamic recrystallization during *** extruded AZ91 alloy contains coarse Mg_(17)Al_(12) discontinuous precipitate(DP)bands parallel to the extrusion direction,which are formed during its cool down after *** contrast,the extruded SEN9 alloy contains relatively fine undissolved Al_(2)Ca,Al_(8)Mn_(4)Y,and Al_(2)Y second-phase particles,which are formed during the solidification stage of the casting *** tensile strength of the extruded SEN9 alloy,which has finer grains and more abundant particles,is slightly higher than that of the extruded AZ91 ***,the difference in their strengths is relatively small because the stronger solid-solution hardening and precipitation hardening effects in the extruded AZ91alloy offset the stronger grain-boundary hardening and dispersion hardening effects in the extruded SEN9alloy to some *** tensile elongation of the extruded AZ91 alloy is significantly lower than that of the extruded SEN9 alloy because the large cracks formed in the DP bands in the former cause its premature *** the extruded SEN9 alloy has higher tensile properties than the extruded AZ91alloy,the high-cycle fatigue life and fatigue strength of the former are shorter and lower,respectively,than those of the *** DP bands in the extruded

关键词： Mg-Al-Zn-Ca-Y alloy Extrusion Tensile properties High-cycle fatigue Crack source

Robot-assisted laparoscopic pyeloureterostomy for ureteropelvic junction rupture sustained in a traffic accident:A case report

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World Journal of Clinical Cases 2020年第22期8卷 5802-5808页

作者： Si Hyun kim woong Bin kim Jae Heon kim Sang Wook Lee Department of Urology Soonchunhyang University Cheonan HospitalCheonan 31151South Korea Department of Urology Soonchunhyang University Bucheon HospitalBucheon 14584South Korea Department of Urology Soonchunhyang University Seoul HospitalSoonchunhyang University Medical CollegeSeoul 04401South Korea Department of Urology Soonchunhyang University Bucheon HospitalSoonchunhyang University School of MedicineBucheon 14584South Korea

BACKGROUND Ureteral reconstruction is a highly technical type of laparoscopic or open *** incidence of ureteral injury is low;however,ureteral injuries tend to be *** surgery for urinary reconstructive surgery is growing in popularity,which has made procedures such as pyeloplasty,ureteroureterostomy,and ureteroneocystostomy possible,with minimal damage to the *** the best of our knowledge,this is the first report of robot-assisted laparoscopic pyeloureterostomy in Korea,in a 17-year-old female patient with a ureteral *** SUMMARY The patient,a 17-year-old girl without previous medical history,was presented at the emergency room and complained of abdominal and back *** in the right upper quadrant was observed on physical *** in the right perirenal space was observed without abdominal organ injuries on the initial enhanced abdomen computed tomography(CT)*** injury was not suspected at this *** patient was stabilized via conservative treatment,but complained of right flank pain 3 wk later and revisited the emergency *** enhanced abdominal CT scan revealed a huge urinoma in the right perirenal space with hydronephrosis of the right *** and antegrade pyelography were *** and discontinuity of the ureter were found.A rupture of the ureteropelvic junction was diagnosed and reconstructive surgery was *** 3 mo,the patient did not complain of any symptoms without any abnormal radiologic *** This case report discusses the safety and effectiveness of this minimal invasive procedure as an alternative to conventional open or laparoscopic surgery.

关键词： Robot surgical procedure Ureteral injuries Minimal invasive surgical procedures Reconstructive surgical procedures Urology Case report

Synthesis of high-performance nickel hydroxide nanosheets/gadolinium doped-α-MnO_(2) composite nanorods as cathode and Fe_(3)O_(4)/GO nanospheres as anode for an all-solid-state asymmetric supercapacitor

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Journal of Energy Chemistry 2022年第1期31卷 475-484,I0013页

作者： Milan Babu Poudel han Joo kim Department of Convergence Engineering Technology Jeonbuk National UniversityJeonju Jeollabuk-do 54896Republic of Korea

The wide use of manganese dioxide(MnO_(2))as an electrode in all-solid-state asymmetric supercapacitors(ASCs)remains challenging because of its low electrical *** complication can be circumvented by introducing trivalent gadolinium(Gd)ions into the MnO_(2).Herein,we describe the successful hydrothermal synthesis of crystalline Gd-doped MnO_(2) nanorods with Ni(OH)_(2) nanosheets as cathode,which we combined with Fe_(3)O_(4)/GO nanospheres as anode for all-solid-state *** tests dem on strate that Gd dopi ng sign ifica ntly affected the electrochemical activities of the MnO_(2),which was further enhanced by introducing Ni(OH)_(2).The GdMnO_(2)/Ni(OH)_(2) electrode offers sufficient surface electrochemical activity and exhibits excellent specific capacity of 121.8 mA h g^(-1),at 1A g^(-1),appealing rate performance,and ultralong lifetime stability(99.3%retention after 10,000 discharge tests).Furthermore,the GdMnO_(2)/Ni(OH)_(2)//PVA/KOH//Fe_(3)O_(4)/GO solid-state ASC device offers an impressive specific energy density(60.25 W h kg^(-1))at a high power density(2332 W kg^(-1)).This investigation thus shows its large potential in developing novel approaches to energy storage devices.

关键词： Solid-state supercapacitor Manganese dioxide Gadolinium doping Nickel hydroxide nanosheets

Improving Method of Anomaly Detection Performance for Industrial IoT Environment

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Computers, Materials & Continua 2022年第9期72卷 5377-5394页

作者： Junwon kim Jiho Shin Ki-woong Park Jung Taek Seo Department of Information Security Engineering Gachon UniversitySeongnam13120Korea Police Science Institute Korea National Police UniversityAsan31539Korea SysCore Lab. Sejong UniversitySeoul05006Korea Department of Computer Engineering Gachon UniversitySeongnam13120Korea

Industrial Control System(ICS),which is based on Industrial IoT(IIoT),has an intelligent mobile environment that supports various mobility,but there is a limit to relying only on the physical security of the ICS *** to various threat factors that can disrupt the workflow of the IIoT,machine learning-based anomaly detection technologies are being presented;it is also essential to study for increasing detection performance to minimize model errors for promoting stable ICS *** this paper,we established the requirements for improving the anomaly detection performance in the IIoT-based ICS environment by analyzing the related *** that,we presented an improving method of the performance of a machine learning model specialized for IIoT-based ICS,which increases the detection rate by applying correlation coefficients and clustering;it provides a mechanism to predict thresholds on a ***,we adopted the HAI dataset environment that actively reflected the characteristics of IIoT-based ICS and demonstrated that performance could be improved through comparative experiments with the traditional method and our proposed *** presented method can further improve the performance of commonly applied error-based detection techniques and includes a primary method that can be enhanced over existing detection techniques by analyzing correlation coefficients between features to consider feedback between ICS *** can contribute to improving the performance of several detection models applied in ICS and other areas.

关键词： Industrial IoT industrial control system anomaly detection clustering algorithm correlation coefficient

Robust vision-based displacement measurement and acceleration estimation using RANSAC and Kalman filter

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 347-358页

作者： Jongbin Won Jong-woong Park Min-Hyuk Song Youn-Sik kim Dosoo Moon Department of Civil and Environmental Engineering Chung-Ang UniversityDongjakSeoul 06974Korea Department of Smart Cities Chung-Ang UniversityDongjakSeoul 06974Korea R&D Division Tantan Safety co.LtdSeongdongSeoul 04798Korea Department of Civil and Environmental Engineering University of Hawaii at ManoaHonolulu 96822USA

Computer vision(CV)-based techniques have been widely used in the field of structural health monitoring(SHM)owing to ease of installation and cost-effectiveness for displacement *** paper introduces computer vision based method for robust displacement measurement under occlusion by incorporating random sample consensus(RANSAC).The proposed method uses the Kanade-Lucas-Tomasi(KLT)tracker to extract feature points for tracking,and these feature points are filtered through RANSAC to remove points that are noisy or *** the filtered feature points,the proposed method incorporates Kalman filter to estimate acceleration from velocity and displacement extracted by the *** validation,numerical simulation and experimental validation are *** the simulation,performance of the proposed RANSAC filtering was validated to extract correct displacement out of group of displacements that includes dummy displacement with noise or *** the experiment,both RANSAC filtering and acceleration measurement were validated by partially occluding the target for tracking attached on the *** results demonstrated that the proposed method successfully measures displacement and estimates acceleration as compared to a reference displacement sensor and accelerometer,even under occluded conditions.

关键词： computer vision structural displacement structural acceleration RANSAC Kalman filter

Suppression of Oxidative Stress of Modified Gongjin-Dan (WSY^1075) in Detrusor Underactivity Rat Model Bladder Outlet Induced by Obstruction

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Chinese Journal of Integrative Medicine 2018年第9期24卷 670-675页

作者： Jin-Woo Jung Seung Hwan Jeon woong Jin Bae Su Jin kim Mun Su Chung Byung II Yoon Sae woong Choi U Syn Ha Sung Yeoun Hwang Sae woong kim Department of Urology International St. Mary's Hospital Catholic Kwandong University College of Medicine Incheon Republic of Korea Institute for Bio-Medical Convergence College of Medicine Catholic Kwandong University Gangneungsi Gangwon-do Republic of Korea Department of Urology College of Medicine The Catholic University of Korea Seoul Republic of Korea Catholic Integrative Medicine Research Institute College of Medicine The Catholic University of Korea Seoul Republic of Korea Korea Bio Medical Science Institute Seoul Republic of Korea

Objective： To investigate the anti-oxidative stress and preventive effect of modified Gongjin-dan （WSY-1075） in a detrusor underactivity rat model. Methods： Rats were randomly allocated to three groups： sham- operated （control）, bladder outlet obstruction-induced detrusor underactivity （BOO-DU）, and BOO-DU with WSY-1075 （WSY） groups. WSY-1075 was orally administrated to rats 200 mg daily for 2 weeks pdor to the operation and 4 weeks after the operation. Bladder outlet obstruction was surgically induced in rats by ligation around the urethra avoiding total obstruction. Cystometrography was conducted on rats in each group for examination of bladders. Results： Compared with the control group, bladder outlet obstruction led to a significant increase in oxidative stress with consequent changes to molecular composition, and decrease in maximal detrusor pressure （P〈0.05）. WSY-1075 treatment significantly suppressed oxidative stress and prevented degenerative and dysfunctional changes in bladder, as compared with BOO-DU group （P〈0.05）. Conclusion： WSY-1075 had beneficial effect on prevention of BOO-DU.

关键词： detrusor underactivity anti-oxidant herbal