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Numerical analysis of thermal plasma scrubber for CF4 decomposition

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Plasma Science and Technology 2019年第6期21卷 9-14页

作者： J KO T H KIM S choi Department of Nuclear and Energy Engineering Jeju National University Jeju 63243 Republic of Korea Institute for Nuclear Science and Technology Jeju National University Jeju 63243 Republic of Korea

CF4 gas emitted in the semiconductor and display manufacturing process is a very harmful greenhouse *** must be removed or converted safely due to its extreme *** a CF4 decomposition system using a thermal plasma scrubber was commercialized,its removal efficiency is *** this work,a numerical analysis of CF4 decomposition in the thermal plasma scrubber was carried out in order to propose an efficient decomposition *** decomposition and recombination temperatures of CF4 were analyzed using thermodynamic equilibrium *** chemical reaction of CF4 decomposition into carbon and fluorine gas was considered in this numerical *** injection position and angle of the CF4 were controlled in order to enhance the decomposition *** vertical injection of CF4 near the torch exit improved the mixing of the CF4 with the thermal plasma *** addition,it was confirmed that the high temperature region expanded due to a vortex generated by strong turbulence in the bottleneck-shaped *** a result,it is revealed that the CF4 injection location and the reactor configuration are the most important factors in improving the decomposition rate.

关键词： numerical simulation decomposition CF4 thermal plasma scrubber

Reaction mechanism and additional lithium storage of mesoporous MnO_(2) anode in Li batteries

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Journal of Energy Chemistry 2021年第2期30卷 276-284,I0010页

作者： Jaesang Yoon Woosung choi Taewhan Kim Hyunwoo Kim Yun Seok choi Ji Man Kim Won-Sub Yoon Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Department of Chemistry Sungkyunkwan UniversitySuwon 16419South Korea

Nanostructured transition metal oxides,employed as anode materials for lithium-ion batteries,exhibit a higher capacity than the theoretical capacity based on the conversion *** date,the reasons behind this phenomenon are *** the one-step evolution of anode material for lithium-ion batteries,it is essential to understand the lithium storage reaction mechanism of the anode ***,we provide a detailed report on the lithium storage and release mechanism of MnO2,using synchrotron-based X-ray techniques.X-ray diffraction and X-ray absorption spectroscopy results indicate that during the first discharge,MnO2 is reduced in the order of MnO2→LixMnO2(1

关键词： Mesoporous MnO_(2) Reaction mechanism Electrolyte-derived surface layer Synchrotron-based X-ray techniques Anode Li battery

An Approach to Share Architectural Drawing Information and Document Information for Automated Code Checking System

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Tsinghua Science and Technology 2008年第S1期13卷 171-178页

作者： Jungsik choi Inhan Kim Department of Architectural Engineering Kyung-Hee University College of Architecture and Civil Engineering Kyung-Hee University

The purpose of this study is to suggest a way of optimized managing and sharing information between standard architectural drawings and construction documents in Korea architectural industry for automated code checking system by linked STEP and XML. To archive this purpose, the authors have analyzed current research and technical development for STEP and XML link and developed a prototype system for sharing information between model based drawings and XML based construction documents. Finally, the authors have suggested practical use scenario of sharing information through linked STEP and XML using test case of automatic code checking. In the paper, the possibility of constructing integrated architectural computing environment through exchange and sharing of drawing information and external data for the whole building life-cycle, from the conceptual design stage to the construction and maintenance stage has been examined. Automated code checking through linked STEP and XML could be enhanced through col-laboration business, more completed code, improved building performance, and reduced construction costs.

关键词： STEP XML sharing and exchange architectural drawing information construction document information

Prediction accuracy of reservoir break flood simulation model using finite volume method and UAV

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 7-15页

作者： Jeongbae Jeon Won choi Spatial Information Research Institute Korea Land and Geospatial Infomatix CorporationKorea Land and Geospatial Infomatix CorporationJeollabuk-doSouth Korea Department of Rural Systems Engineering Global Smart Farm Convergence MajorResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826South Korea

Methods for producing high-resolution digital topographic maps using an unmanned aerial vehicle(UAV),and 3D fluid dynamics simulation to estimate the flooded areas caused by a collapsed reservoir,were proposed in this *** UAV flight path for photographing damaged areas was divided into two sections considering the drone flight time and overlapping range of the images in the x-and *** metadata taken by the drone were transferred into world coordinates by tracking the key features of the photographs of nearby areas using a 3D rotation *** point cloud data with a 3D space were extracted from the registered images,and a digital surface map(DSM)was produced using a point cloud classification geometric mapping *** amend the serious elevation errors caused by natural or artificial obstacles,a kriging interpolation method was used to reproduce the DSM.A transient computational simulation that considers both the complex geometric topology and hydrodynamic energy of flowing water was conducted using FLOW-3D software to deal with an renormalization group(RNG)turbulence *** flooded areas calculated through visual reading using images taken by the UAV were compared with the 3D simulation results for *** flooded areas estimated through the simulation were approximately 18.3%larger than those found by visual *** flows were mainly observed in obstacles or curved areas of the stream,and the differences in the water depth could be further ***,the villagers confirmed that the flooded areas were much greater than what was seen through the visual ***,the combination of UAV surveying and the 3D simulation method based on the RNG turbulence model is recommended to accurately estimate flooded areas,and it will support an administrative policy aimed at minimizing the economic costs of damage caused by future reservoir collapses.

关键词： reservoir failure flooded area finite volume method unmanned aerial vehicle photogrammetric survey digital surface model

Rapid monitoring of indoor airborne influenza and coronavirus with high air flowrate electrostatic sampling and PCR analysis

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 73-85页

作者： Sanggwon An Sangsoo choi Hyeong Rae Kim Jungho Hwang School of Mechanical Engineering Yonsei UniversitySeoul 02876Republic of Korea Gas Metrology Group Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea

The World Health Organization has raised concerns about the possibility of airborne transmission in enclosed and poorly ventilated ***,rapid monitoring of airborne viruses is necessary in multi-use facilities with dense ***,an electrostatic air sampler(250 L/min)was developed in this work to obtain indoor viral aerosol samples for analysis via the Polymerase Chain Reaction(PCR).Aerosol tests with H1N1 and HCoV-229E were performed to evaluate the sample collection *** analysis,along with another aerosol test,was conducted to evaluate the recovery of the virus particles collected by the *** laboratory tests,our electrostatic sampler obtained viral samples that were detectable by PCR under the simulated viral pandemic scenario(3000 RNA copies per cubic meter of air)within 40 *** resulting cycle threshold(C)values were 35.07 and 37.1 for H1N1 and HCoV-229E,*** the performance evaluation in the laboratory,field tests were conducted in a university classroom from October 28 to December 2,*** A and HCoV-229E were detected in two air samples,and the corresponding C,values were 35.3 and *** PCR results are similar to those obtained from laboratory tests,considering the simulatedviralpandemic scenario.

关键词： Airborne virus Electrostatic sampler Rapid monitoring Indoor environment Field test

Klippel-Trenaunay-Weber syndrome with ischemic stroke:A case report

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World Journal of Clinical Cases 2022年第29期10卷 10543-10549页

作者： Geunsu Lee Taegi choi Department of Rehabilitation Medicine Kwangju Christian HospitalGwangju 61661South Korea

BACKGROUND Klippel-Trenaunay-Weber syndrome(KTWS)is a very rare syndrome that involves three conditions:Cutaneous hemangiomas,varicosities,and soft-tissue hypertrophy of the affected *** are few cases of ischemic infarction with ***,we describe a case of KTWS with ischemic *** SUMMARY A 43-year-old man was diagnosed with KTWS with ischemic *** chief complaints were worsening weakness and spasticity in the right *** symptoms had been present for 1 year,but the patient did not receive comprehensive rehabilitation until he underwent a 3-week integrated inpatient rehabilitation program at our *** the program,his muscle strength,walking ability,and exercise endurance *** relatively rare,clinicians should consider the possibility of a thromboembolic event in KTWS *** rehabilitation can help such patients to recover *** In conclusion,although rare,patients with KTWS may experience central nervous system vascular malformations and accompanying *** is necessary to investigate whether such patients have any neurological or comorbid *** in the subacute or chronic period after neurological insult,integrated rehabilitation programs can lead to structural and functional enhancement.

关键词： Klippel-Trenaunay-Weber syndrome Ischemic stroke Peripheral arterial disease Exercise program Case report

Vertically Integrated Electronics: New Opportunities from Emerging Materials and Devices

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Nano-Micro Letters 2022年第12期14卷 195-223页

作者： Seongjae Kim Juhyung Seo Junhwan choi Hocheon Yoo Department of Electronic Engineering Gachon University1342 Seongnam-daeroSujeong-guSeongnamGyeonggi-do 13120Republic of Korea Center of Bio-Integrated Electronics Northwestern UniversityEvanstonIL 60208USA Querrey Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Present Address:Department of Chemical Engineering Dankook University152 Jukjeon-roSuji-guYonginGyeonggi-do 16890Republic of Korea

Vertical three-dimensional(3D)integration is a highly attractive strategy to integrate a large number of transistor devices per unit *** approach has emerged to accommodate the higher demand of data processing capability and to circumvent the scaling limitation.A huge number of research efforts have been attempted to demonstrate vertically stacked electronics in the last two *** this review,we revisit materials and devices for the vertically integrated electronics with an emphasis on the emerging semiconductor materials that can be processable by bottom-up fabrication methods,which are suitable for future flexible and wearable *** vertically stacked integrated circuits are reviewed based on the semiconductor materials:organic semiconductors,carbon nanotubes,metal oxide semiconductors,and atomically thin two-dimensional materials including transi-tion metal *** features,device performance,and fabrication methods for 3D integration of the transistor based on each semiconductor are ***,we highlight recent advances that can be important milestones in the vertically integrated elec-tronics including advanced integrated circuits,sensors,and display *** are remaining challenges to overcome;however,we believe that the vertical 3D integration based on emerging semiconductor materials and devices can be a promising strategy for future electronics.

关键词： Vertical stacking Three-dimensional integration Metal routing Via-hole Two-dimensional semiconductors

VColor^(*):a practical approach for coloring large graphs

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Frontiers of Computer Science 2021年第4期15卷 133-149页

作者： Yun PENG Xin LIN Byron choi Bingsheng HE Department of Computer Science Hong Kong Baptist UniversityHong Kong 999077China School of Computer Science and Technology East China Normal UniversityShanghai 200062China School of Computing National University of SingaporeSingapore 119077Singapore

Graph coloring has a wide range of real world applications,such as in the operations research,communication network,computational biology and compiler optimization *** our recent work[1],we propose a divide-andconquer approach for graph coloring,called *** an approach has three generic subroutines.(i)Graph partition subroutine:VColor partitions a graph G into a vertex cut partition(VP),which comprises a vertex cut component(VCC)and small non-overlapping connected components(CCs).(ii)Component coloring subroutine:VColor colors the VCC and the CCs by efficient algorithms.(iii)Color combination subroutine:VColor combines the local colors by exploiting the maximum matchings of color combination bigraphs(CCBs).VColor has revealed some major bottlenecks of efficiency in these ***,in this paper,we propose VColor^(*),an approach which addresses these efficiency bottlenecks without using more colors both theoretically and *** technical novelties of this paper are the following.(i)We propose the augmented VP to index the crossing edges of the VCC and the CCs and propose an optimized CCB construction algorithm.(ii)For sparse CCs,we propose using a greedy coloring algorithm that is of polynomial time complexity in the worst case,while preserving the approximation ratio.(iii)We propose a distributed graph coloring *** extensive experimental evaluation on real-world graphs confirms the efficiency of VColor^(*).In particular,VColor^(*)is 20X and 50X faster than VColor and uses the same number of colors with VColor on the Pokec and PA datasets,***^(*)also significantly outperforms the state-ofthe-art graph coloring methods.

关键词： graph coloring approximation algorithm distributed algorithm

Fluorescence quenching method for the determination of catechol with gold nanoparticles and tyrosinase hybrid system

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Chinese Chemical Letters 2010年第3期21卷 346-348页

作者： Martin M.F.choi Department of Chemistry Hong Kong Baptist University

The determination method of catechol by fluorescence quenching was *** assay was based on the combination of the unique property of gold nanoparticles with tyrosinase enzymatic *** the presence of tyrosinase,the fluorescence of gold nanoparticles was quenched by catechol which can be employed to detect *** the optimal conditions,a linear range 5.0×10^(-7)-1.0×10^(-3) mol L^(-1) and a detection limit 1.0×10^(-7) mol L^(-1) of catechol were obtained.o-Quinone intermediate produced...

关键词： Gold nanoparticles Tyrosinase Catechol Fluorescence quenching