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

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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Online Approach for Spatio-Temporal Trajectory Data Reduction for Portable Devices

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Journal of Computer Science & Technology 2013年第4期28卷 597-604页

作者： Heemin park Young-jun Lee Jinseok Chae Wonik Choi Department of Computer Software Engineering Sangmyung University Department of Computer Science and Engineering Incheon National University School of Information and Communication Engineering Inha University

As location data are widely available to portable devices, trajectory tracking of moving objects has become an essential technology for most location-based services. To maintain such streaming data of location updates from mobile clients, conventional approaches such as time-based regular location updating and distance-based location updating have been used. However, these methods suffer from the large amount of data, redundant location updates, and large trajectory estimation errors due to the varying speed of moving objects. In this paper, we propose a simple but efficient online trajectory data reduction method for portable devices. To solve the problems of redundancy and large estimation errors, the proposed algorithm computes trajectory errors and finds a recent location update that should be sent to the server to satisfy the user requirements. We evaluate the proposed algorithm with real GPS trajectory data consisting of 17 201 trajectories. The intensive simulation results prove that the proposed algorithm always meets the given user requirements and exhibits a data reduction ratio of greater than 87% when the acceptable trajectory error is greater than or equal to 10 meters.

关键词： online trajectory sampling moving object tracking data reduction location-based service

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A Study of the Gas Flow through a LNG Safety Valve

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Journal of Thermal Science 2006年第4期15卷 355-360页

作者： Heuy-DongKim jun-HeeLee Kyung-Am park ToshiakiSetoguchi ShigeruMatsuo School of Mechanical Engineering Andong National University388 Songchun-dongAndong760-749Korea Dynamics Group Korea Research Institute of Standards and ScienceP.O.Box 102Yusong-guDaejeon 305-606Korea Department of Mechanical Engineering Saga University1Honjo-machiSaga-shiSaga 840-8502Japan

A safety valve functions to control an upper limit of pressure inside the LNG line of transportation. If the pressure inside the safety valve nozzle exceeds a predetermined value on the valve sheet which plugs the nozzle, an excess of LNG discharges through the gap between the nozzle exit and valve sheet. In this situation, the forces acting on the valve sheet are gasdynamic forces generated by the discharge of LNG and mechanical forces supported by the spring behind the valve sheet. The flow through the gap is very complicated, involving vortices, flow separation, and shock waves. These affect adversely on the system accompanying with noise and vibration. The present study aims at understanding the flow physics of safety valve. A computational work using the twodimensional, axisymmetric, compressible Navier-Stokes equations is carried out to simulate the gas flow between the nozzle exit and valve sheet, and compared with the theoretical results. It has been found that there exists a distance between nozzle exit and valve sheet in which the thrust coefficient at the valve sheet increases abruptly.

关键词： Compressible flow safety valve thrust coefficient internal flow flow choke

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Combination of Korean Red Ginseng Extract and Hydrogen-Rich Water Improves Spermatogenesis and Sperm Motility in Male Mice

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Chinese Journal of Integrative Medicine 2020年第5期26卷 361-369页

作者： Ja Yoon Ku Min jung park Hyun jun park Nam Cheol park Bo Sun Joo Department of Urology Pusan National University HospitalPusan National University School of MedicineBusan(49241)Republic of Korea Biomedical Research Institute Pusan National University HospitalBusan(49241)Republic of Korea The Korea Institute for Public Sperm Bank Busan(49241)Republic of Korea

Objective: To investigate the effect of hydrogen-rich Korean Red Ginseng(KRG) water(HRGW) mixture on the spermatogenesis and sperm motility of mice of different ages. Methods: Eighty young(3 month-old) and aged(12 month-old) male mice were randomly assigned to 4 groups(n=10 per group) including control group, hydrogen-rich water(HRW) group(10 m L/kg daily), KRG group(50 mg/kg daily) and HRGW group(10 m L/kg HRW and 50 mg/kg KRG daily) by an oral zoned needle for 4 weeks. Sperm count and motility were measured using sperm suspension released from cauda epididymis. Serum follicle stimulating hormone(FSH), luteinizing hormone(LH), testosterone, and reactive oxygen species(ROS) in serum have also been estimated. Tubular changes were examined through histological hematoxylin and eosin staining. Expression of antioxidation(PPx3, PPx4, GSTm5 and GPx4), spermatogenesis(inhibin-α, neptin-2 and CREM), antiaging(SIRT1 and SIRT2), and angiogenesis [visfatin and vascular endothelial growth factor(VEGF)] related genes were examined through realtime polymerase chain reaction. Results: HRW and KRG treatment stimulated spermatogenesis followed by increasing sperm production and sperm motility(P<0.05). These effects were strengthened synergistically by a HRGW mixture(P<0.05 or P<0.01). HRGW greatly increased the expressions of antioxidation, antiaging, spermatogenesis related genes and VEGF especially in aged mice(P<0.05). Serum testosterone and FSH levels also increased, while serum ROS level decreased(all P<0.05). Conclusion: HRGW increases sperm production and motility by enhancing antioxidation and stimulating spermatogenesis and sex hormone production, particularly in aged mice.

关键词： aging ginseng infertlit mineral waters sperm mtility

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LiTFSI salt concentration effect to digest lithium polysulﬁdes for high-loading sulfur electrodes

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Journal of Energy Chemistry 2023年第3期78卷 574-581,I0015页

作者： Jin-Kwang Song Moonsoo Kim Seongbae park Young-jun Kim SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2 详细信息

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2

关键词： Lithium-sulfur battery Electrolyte concentration Li2S deposition High-loading sulfur electrode

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Randomized clinical trial comparing fixed-time split dosing and split dosing of oral Picosulfate regimen for bowel preparation

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World Journal of Gastroenterology 2017年第32期23卷 5986-5993页

作者： Jae Hyuck jun Koon Hee Han Jong Kyu park Hyun Il Seo Young Don Kim sang Jin Lee Baek Gyu jun Min Sik Hwang Yoon Kyoo park Myeong Jong Kim Gab Jin Cheon Department of Internal Medicine Gangneung Asan Hospital University of Ulsan College of Medicine Catholic Kwandong University

AIM To compare the efficacy of fixed-time split dose and split dose of an oral sodium picosulfate for bowel *** This is study was prospective, randomized controlled study performed at a single Institution(2013-058). A total of 204 subjects were assigned to receive one of two sodium picosulfate regimens(i.e., fixed-time split or split) prior to colonoscopy. Main outcome measurements were bowel preparation quality and subject *** There was no statistical difference between the fixedtime split dose regimen group and the split dose regimen group(Ottawa score mean 2.57 ± 1.91 vs 2.80 ± 2.51, P = 0.457). Cecal intubation time and physician's satisfaction of inspection were not significantly different between the two groups(P = 0.428, P = 0.489). On subgroup analysis, for afternoon procedures, the fixed-time split dose regimen was equally effective as compared with the split dose regimen(Ottawa score mean 2.56 ± 1.78 vs 2.59 ± 2.27, P = 0.932). There was no difference in tolerability or compliance between the two groups. Nausea was 21.2% in the fixed-time split dose group and 14.3% in the split dose group(P = 0.136). Vomiting was 7.1% and 2.9%(P = 0.164), abdominal discomfort 7.1% and 4.8%(P = 0.484), dizziness 1% and 4.8%(P = 0.113), cold sweating 1% and 0%(P = 0.302) and palpitation 0% and 1%(P = 0.330), respectively. Sleep disturbance was two(2%) patients in the fixed-time split dose group and zero(0%) patient in the split dose preparation(P = 0.143) *** A fixed-time split dose regimen with sodium picosulfate is not inferior to a split dose regimen for bowel preparation and equally effective for afternoon colonoscopy.

关键词： Colonoscopy Bowel preparation Split dose preparation Sodium picosulfate Ottawa Bowel Preparation Scale

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Multiphase cooperation for multilevel strain accommodation in a single-crystalline BiFeO_(3) thin film

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Chinese Physics B 2024年第9期33卷 57-66页

作者： Wooseon Choi Bumsu park Jaejin Hwang Gyeongtak Han sang-Hyeok Yang Hyeon jun Lee Sung Su Lee Ji Young Jo Albina Y.Borisevich Hu Young Jeong sang Ho Oh Jaekwang Lee Young-Min Kim Department of Energy Science Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Samsung Electronics Hwaseong 18448Republic of Korea Department of Physics Pusan National UniversityBusan 46241Republic of Korea LG Energy Solution Daejeon 34122Republic of Korea Department of Materials Science and Engineering Kangwon National UniversityRepublic of Korea School of Materials Science and Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Center for Nanophase Materials Sciences Oak Ridge National LaboratoryTN 37831USA Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Energy Engineering KENTECH Institute for Energy Materials and DevicesKorea Institute of Energy Technology(KENTECH)Naju 58330Republic of Korea

The functionalities and diverse metastable phases of multiferroic BiFeO_(3)(BFO)thin films depend on the misfit *** mixed phase-induced strain relaxation in multiphase BFO thin films is well known,it is unclear whether a singlecrystalline BFO thin film can accommodate misfit strain without the involvement of its ***,understanding the strain relaxation behavior is key to elucidating the lattice strain–property *** this study,a correlative strain analysis based on dark-field inline electron holography(DIH)and quantitative scanning transmission electron microscopy(STEM)was performed to reveal the structural mechanism for strain accommodation of a single-crystalline BFO thin *** nanoscale DIH strain analysis results indicated a random combination of multiple strain states that acted as a primary strain relief,forming irregularly strained *** STEM-based bond length measurement of the corresponding strained nanodomains revealed a unique strain accommodation behavior achieved by a statistical combination of multiple modes of distorted structures on the unit-cell *** globally integrated strain for each nanodomain was estimated to be close to􀀀1.5%,irrespective of the nanoscale strain states,which was consistent with the fully strained BFO film on the SrTiO_(3) *** functional theory calculations suggested that strain accommodation by the combination of metastable phases was energetically favored compared to single-phase-mediated *** discovery allows a comprehensive understanding of strain accommodation behavior in ferroelectric oxide films,such as BFO,with various low-symmetry polymorphs.

关键词： BiFeO_(3) scanning transmission electronmicroscopy electron holography multiferroic material strain mapping

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Recent advances in endoscopic retrograde cholangiopancreatography in Billroth II gastrectomy patients: A systematic review

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World Journal of Gastroenterology 2019年第24期25卷 3091-3107页

作者： Tae Young park Tae jun Song Department of Internal Medicine Inje University Seoul Paik HospitalSeoul 04551South Korea Division of Gastroenterology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 138-736South Korea

BACKGROUND Endoscopic retrograde cholangiopancreatography(ERCP)in patients with Billroth Ⅱ gastrectomy has been considered a challenging procedure due to the surgically altered gastrointestinal ***,there has been a paucity of comparative studies regarding ERCP in Billroth Ⅱ gastrectomy cases because of procedure-related morbidity and mortality and practical and ethical *** systematic and comprehensive review was performed to obtain a recent perspective on ERCP in Billroth Ⅱ gastrectomy *** To systematically review the literature regarding ERCP in Billroth Ⅱ gastrectomy *** A systematic review was performed on the literature published between May 1975 and January *** following electronic databases were searched:PubMed,EMBASE,and Cochrane *** outcomes of successful afferent loop intubation and successful selective cannulation and occurrence of adverse events were *** A total of 43 studies involving 2669 patients were *** study designs were 36(83.7%)retrospective cohort studies,4(9.3%)retrospective comparative studies,2(4.7%)prospective comparative studies,and 1(2.3%)prospective cohort *** a total of 2669 patients,there were 1432 cases(55.6%)of sideviewing endoscopy,664(25.8%)cases of forward-viewing endoscopy,171(6.6%)cases of balloon-assisted enteroscopy,169(6.6%)cases of anterior obliqueviewing endoscopy,64(2.5%)cases of dual-lumen endoscopy,31(1.2%)cases of colonoscopy,and 14(0.5%)cases of multiple bending *** overall success rate of afferent loop intubation was 91.3%(2437/2669),and the overall success rate of selective cannulation was 87.9%(2346/2437).A total of 195 cases(7.3%)of adverse events *** success rates of afferent loop intubation and the selective cannulation rate for each type of endoscopy were as follows:side-viewing endoscopy 98.2%and 95.3%;forward-viewing endoscopy 97.4%and 95.2%;balloon-assisted enteroscopy 95.4%and 97.5%;oblique-viewing endosco

关键词： Endoscopic retrograde Cholangiopancreatography Therapeutic Endoscope Billroth Ⅱ operation Adverse event Systematic review

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High level of preoperative carbohydrate antigen 19-9 is a poor survival predictor in gastric cancer

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World Journal of Gastroenterology 2013年第32期19卷 5302-5308页

作者： A Ra Choi jun Chul park Jie-Hyun Kim Sung Kwan Shin sang Kil Lee Yong Chan Lee Jae Bock Chung Department of Internal Medicine and Institute of Gastroenterology Yonsei University College of Medicine

AIM:To assess the clinical significance and the prognostic value of preoperative serum carbohydrate antigen 19-9(CA 19-9)level in gastric ***:Between January 2005 and December2006,1960 patients underwent surgery for histologically confirmed gastric *** these,163 patients had elevated serum levels of CA 19-9 preoperatively,and1628 patients had normal serum levels of CA 19-9 *** this study,325 patients were selected from the group of 1628 patients by age,sex,and cancer stage to serve as *** significant differences in survival rates were calculated using the log-rank test.A P value less than 0.05 was considered statistically significant and was determined using SAS ***:The baseline characteristics showed some differences between the two groups with regard to *** survival(OS)in the elevated and nonelevated group was 37.90 and 68.67 mo,respectively(P<0.001).N stage(P=0.001)was a significant predictor of disease-free survival by multivariate ***,N stage(P<0.001),and the presence of peritoneal metastasis(P<0.001)remained independent factors in predicting OS by multivariate ***,preoperative serum CA 19-9 levels were significantly associated with OS in univariate(P=0.009)and multivariate(P=0.021)***:Serum CA 19-9 can be considered an independent prognostic factor in predicting OS in patients anticipating surgery for gastric cancer.

关键词： Gastric cancer Carbohydrate antigen 19-9 Disease-free survival Overall survival

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Nonlinear Electrical Impedance Tomography Method Using a Complete Electrode Model for the Characterization of Heterogeneous Domains

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Computer Modeling in Engineering & Sciences 2023年第3期134卷 1707-1735页

作者： Jeongwoo park Bong-Gu jung jun Won Kang Department of Civil and Environmental Engineering Hongik UniversitySeoul04066Korea

This paper presents an electrical impedance tomography(EIT)method using a partial-differential-equationconstrained optimization *** forward problem in the inversion framework is described by a complete electrodemodel(CEM),which seeks the electric potential within the domain and at surface electrodes considering the contact impedance between *** finite element solution of the electric potential has been validated using a commercial *** inverse medium problem for reconstructing the unknown electrical conductivity profile is formulated as an optimization problem constrained by the *** method seeks the optimal solution of the domain’s electrical conductivity to minimize a Lagrangian functional consisting of a least-squares objective functional and a regularization *** the stationarity of the Lagrangian leads to state,adjoint,and control problems,which constitute the Karush-Kuhn-Tucker(KKT)first-order optimality ***,the electrical conductivity profile of the domain is iteratively updated by solving the KKT conditions in the reduced space of the control *** results show that the relative error of the measured and calculated electric potentials after the inversion is less than 1%,demonstrating the successful reconstruction of heterogeneous electrical conductivity profiles using the proposed EIT *** method thus represents an application framework for nondestructive evaluation of structures and geotechnical site characterization.

关键词： Electrical impedance tomography complete electrode model inverse medium problem Karush-Kuhn-Tucker(KKT)optimality conditions nondestructive evaluation of structures

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