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Engineering electrode interfaces for telecom-band photodetection in MoS_(2)/Au heterostructures via sub-band light absorption

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Light(Science & Applications) 2023年第12期12卷 2677-2687页

作者： Chengyun Hong Saejin Oh Vu Khac Dat Sangyeon Pak SeungNam Cha Kyung-Hun Ko gyung-min choi Tony Low Sang-Hyun Oh Ji-Hee Kim Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea Center for Integrated Nanostructure Physics(CINAP) Institute for Basic Science(IBS)Sungkyunkwan UniversitySuwon 16419Republic of Korea School of Electronic and Electrical Engineering Hongik UniversitySeoul 04066Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Electrical and Computer Engineering University of MinnesotaMinneapolisMN 55455USA Department of Physics Pusan National UniversityBusan 46241Republic of Korea

Transition metal dichalcogenide(TMD)layered semiconductors possess immense potential in the design of photonic,electronic,optoelectronic,and sensor ***,the sub-bandgap light absorption of TMD in the range from near-infrared(NIR)to short-wavelength infrared(SWIR)is insufficient for applications beyond the bandgap ***,we report that the sub-bandgap photoresponse of MoS_(2)/Au heterostructures can be robustly modulated by the electrode fabrication method *** observed up to 60%sub-bandgap absorption in the MoS_(2)/Au heterostructure,which includes the hybridized interface,where the Au layer was applied via sputter *** greatly enhanced absorption of sub-bandgap light is due to the planar cavity formed by MoS_(2) and Au;as such,the absorption spectrum can be tuned by altering the thickness of the MoS_(2) *** in the SWIR wavelength range increases due to increased absorption,which means that broad wavelength detection from visible toward SWIR is *** also achieved rapid photoresponse(~150μs)and high responsivity(17 mA W^(-1))at an excitation wavelength of *** findings demonstrate a facile method for optical property modulation using metal electrode engineering and for realizing SWIR photodetection in wide-bandgap 2D materials.

关键词： MoS_(2) absorption electrode

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Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

Numerical Analysis of Urea Decomposition with Static Mixers ...

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作者： Cheolyong choi Yonmo Sung gyung min choi Duck Jool Kim School of Mechanical Engineering Pusan National University

A numerical simulation for urea decomposition into ammonia with static mixers was performed for marine selective catalytic *** types of mixer were considered to improve urea into ammonia conversion *** effect of each mixer such as pressure drop,particle residence time,and uniform distribution of urea water solution was investigated using three dimensional CFD *** mixer regardless of a type was improved urea *** performance could be affected by high pressure drop caused by ***,the proper mixer should be chosen in permissible level of pressure drop as well as ammonia conversion rate.

关键词： Selective catalytic reduction(SCR) static mixer urea decomposition urea water solution(UWS)

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Infrared-harvesting colloidal quantum dot inks for efficient photovoltaics: Impact of surface chemistry and device engineering

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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

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Parallel Cloth Simulation Using OpenGL Shading Language

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Computer Systems Science & Engineering 2022年第5期41卷 427-443页

作者： Hongly Va min-Hyung choi min Hong Department of Software Convergence Soonchunhyang UniversityAsan31538Korea Department of Computer Science and Engineering University of Colorado DenverDenverCO 80217USA Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea

The primary goal of cloth simulation is to express object behavior in a realistic manner and achieve real-time performance by following the fundamental concept of *** general,the mass–spring system is applied to real-time cloth simulation with three types of ***,hard spring cloth simulation using the mass–spring system requires a small integration time-step in order to use a large stiffness ***,to obtain stable behavior,constraint enforcement is used instead of maintenance of the force of each *** force computation involves a large sparse linear solving *** to the large computation,we implement a cloth simulation using adaptive constraint activation and deactivation techniques that involve the mass-spring system and constraint enforcement method to prevent excessive elongation of *** the same time,when the length of the spring is stretched or compressed over a defined threshold,adaptive constraint activation and deactivation method deactivates the spring and generate the implicit *** method that uses a serial process of the Central Processing Unit(CPU)to solve the system in every frame cannot handle the complex structure of cloth model in *** simulation utilizes the Graphic Processing Unit(GPU)parallel processing with compute shader in OpenGL Shading Language(GLSL)to solve the system *** this paper,we design and implement parallel method for cloth simulation,and experiment on the performance and behavior comparison of the mass-spring system,constraint enforcement,and adaptive constraint activation and deactivation techniques the using GPU-based parallel method.

关键词： Adaptive constraint cloth simulation constraint enforcement GLSL compute shader mass–spring system parallel GPU

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Real-time Volume Preserving Constraints for Volumetric Model on GPU

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Computers, Materials & Continua 2022年第10期73卷 831-848页

作者： Hongly Va min-Hyung choi min Hong Department of Software Convergence Soonchunhyang UniversityAsan31538Korea Department of Computer Science and Engineering University of Colorado DenverDenver80217COUSA Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea

This paper presents a parallel method for simulating real-time 3D deformable objects using the volume preservation mass-spring system method on tetrahedron *** general,the conventional mass-spring system is manipulated as a force-driven method because it is fast,simple to implement,and the parameters can be ***,the springs in traditional mass-spring system can be excessively elongated which cause severe stability and robustness issues that lead to shape restoring,simulation blow-up,and huge volume loss of the deformable *** addition,traditional method that uses a serial process of the central processing unit(CPU)to solve the system in every frame cannot handle the complex structure of deformable object in ***,the first order implicit constraint enforcement for a mass-spring model is utilized to achieve accurate visual realism of deformable objects with tough constraint *** this paper,we applied the distance constraint and volume conservation constraints for each tetrahedron element to improve the stability of deformable object simulation using the mass-spring system and behave the same as its real-world *** reduce the computational complexity while ensuring stable simulation,we applied a method that utilizes OpenGL compute shader,a part of OpenGL Shading Language(GLSL)that executes on the graphic processing unit(GPU)to solve the numerical problems *** applied the proposed methods to experimental volumetric models,and volume percentages of all objects are *** average volume percentages of all models during the simulation using the mass-spring system,distance constraint,and the volume constraint method were 68.21%,89.64%,and 98.70%,*** proposed approaches are successfully applied to improve the stability of mass-spring system and the performance comparison from our experimental tests also shows that the GPU-based method is faster than CPU-based implementation for all cases.

关键词： Deformable object simulation mass-spring system implicit constraint enforcement volume conservation constraint GPU parallel computing

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Nano-precision combined process of electrolytic in-process dressing grinding and magnetic assisted polishing on optics glass material

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中国有色金属学会会刊：英文版 2009年第B09期19卷 301-306页

作者： Tae-Soo KWAK Yong-Chul LEE gyung-Nyun KIM Dae-Bong choi Mikio YAMANOI Hitoshi OHMORI Department of Mechanical Engineering Jinju National University

This study is focused on the application of an effective fabrication method combining electrolytic in-process dressing(ELID) grinding and magnetic assisted polishing(MAP) to nano-precision mirror surface grinding on the optics glass-ceramic named Zerodure that is commonly used in precision optics components. The results show the variation of surface roughness after MAP processes utilizing Fe+CeO2, Fe+CeO2+diamond paste and Fe+diamond paste are applied to ELID ground surfaces. The MAP surface roughnesses for ELID ground surface roughnesses(Ra) of 52.1, 39.8 and 51.1 nm using #1200 grinding wheel are improved to 6.1, 4.6 and 1.9 nm, respectively. The surface roughness of MAP process using Fe+CeO2+diamond paste is superior to that using other processes. Moreover, it takes less than 10 min to conduct the MAP processes. The combined method suggested effectively reduces the working time to get the required surface qualities.

关键词：在线电解修整光学玻璃纳米相抛光材料电解过程表面粗糙度地面粗糙度磨削

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Moth-eye Structured Polydimethylsiloxane Films for High-Efficiency Perovskite Solar Cells

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Nano-Micro Letters 2019年第3期11卷 271-280页

作者： mincheol Kim Segeun Jang Jiwoo choi Seong min Kang Mansoo choi Global Frontier Center for Multiscale Energy Systems Seoul National UniversitySeoul151.744Republic of Korea Department of Mechanical and Aerospace Engineering Seoul National UniversitySeoul151.744Republic of Korea Department of Mechanical Engineering Hanbat National UniversityDaejeon34158Republic of Korea Department of Mechanical Engineering Chungnam National UniversityDaejeon34134Republic of Korea

Large-area polydimethylsiloxane(PDMS)films with variably sized moth-eye structures were fabricated to improve the efficiency of perovskite solar *** approach that incorporated photolithography,bilayer PDMS deposition and replication was used in the fabrication *** simply attaching the moth-eye PDMS films to the transparent substrates of perovskite solar cells,the optical properties of the devices could be tuned by changing the size of the moth-eye *** device with 300-nm moth-eye PDMS films greatly enhanced power conversion efficiency of ~21 % due to the antireflective effect of the moth-eye ***,beautiful coloration was observed on the 1000-nm moth-eye PDMS films through optical interference caused by the diffraction grating *** results imply that moth-eye PDMS films can greatly enhance the efficiency of perovskite solar cells and building-integrated photovoltaics.

关键词： Polydimethylsiloxane films Moth-eye Photolithography Perovskite solar cells Photovoltaic

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CoolVox:Advanced 3D convolutional neural network models for predicting solar radiation on building facades

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Building Simulation 2022年第5期15卷 755-768页

作者： Jung min Han Eun Seuk choi Ali Malkawi Harvard University Graduate School of Design CambridgeUSA Harvard Center for Green Buildings and Cities CambridgeUSA Harvard John A.Paulson School of Engineering and Applied Sciences CambridgeUSA

Data-driven models have become increasingly prominent in the building,architecture,and construction *** area ideally suited to exploit this powerful new technology is building performance ***-based models have traditionally been used to estimate the energy flow,air movement,and heat balance of ***,physics-based models require many assumptions,significant computational power,and a considerable amount of time to output *** neural networks(ANNs)with prefabricated or simulated data are likely to be a more feasible option for environmental analysis conducted by designers during the early design *** ANNs require fewer inputs and shorter computation times and offer superior performance and potential for data augmentation,they have received increased attention for predicting the surface solar radiation on ***,ANNs can provide innovative and quick design solutions,enabling designers to receive instantaneous feedback on the effects of a proposed change to a building's *** research introduces deep learning methods as a means of simulating the annual radiation intensities and exposure level of buildings without the need for physics-based *** propose the CoolVox model to demonstrate the feasibility of using 3D convolutional neural networks to predict the surface radiation on building *** CoolVox model accurately predicted the radiation intensities of building facades under different boundary conditions and performed better than ARINet(with average mean square errors of 0.01 and 0.036,respectively)in predicting the radiation intensity both with(validation error=0.0165)and without(validation error=0.0066)the presence of boundary buildings.

关键词： artificial neural networks 3D convolutional neural networks solar radiation simulation building performance simulation

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Artificial intelligence based real-time microcirculation analysis system for laparoscopic colorectal surgery

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World Journal of Gastroenterology 2020年第44期26卷 6945-6962页

作者： Sang-Ho Park Hee-min Park Kwang-Ryul Baek Hong-min Ahn In Young Lee gyung Mo Son Department of Electronic Engineering Pusan National UniversityBusan 46241South Korea Department of Surgery Pusan National University Yangsan HospitalGyeongsangnam-do 50612South Korea Department of Medicine Pusan National UniversityGyeongsangnam-do 50612South Korea Department of Surgery Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsan-si 50612South Korea

BACKGROUND Colonic perfusion status can be assessed easily by indocyanine green(ICG)angiography to predict ischemia related anastomotic complications during laparoscopic colorectal ***,various parameter-based perfusion analysis have been studied for quantitative evaluation,but the analysis results differ depending on the use of quantitative parameters due to differences in vascular anatomical ***,it can help improve the accuracy and consistency by artificial intelligence(AI)based real-time analysis microperfusion(AIRAM).AIM To evaluate the feasibility of AIRAM to predict the risk of anastomotic complication in the patient with laparoscopic colorectal cancer *** The ICG curve was extracted from the region of interest(ROI)set in the ICG fluorescence video of the laparoscopic colorectal ***-processing was performed to reduce AI performance degradation caused by external environment such as background,light source reflection,and camera shaking using MATLAB 2019 on an I7-8700k Intel central processing unit(CPU)*** learning and evaluation were performed by dividing into a training patient group(n=50)and a test patient group(n=15).Training ICG curve data sets were classified and machine learned into 25 ICG curve patterns using a self-organizing map(SOM)*** predictive reliability of anastomotic complications in a trained SOM network is verified using test *** AI-based risk and the conventional quantitative parameters including T1/2max,time ratio(TR),and rising slope(RS)were consistent when colonic perfusion was favorable as steep increasing ICG curve *** the ICG graph pattern showed stepped rise,the accuracy of conventional quantitative parameters decreased,but the AI-based classification maintained accuracy *** receiver operating characteristic curves for conventional parameters and AI-based classification were comparable for predicting the anastomotic complication *** pe

关键词： Indocyanine green Laparoscopic Artificial intelligent Anastomotic complications Colorectal surgery Microcirculation analysis

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Applicability of cement-based grout for ground heat exchanger considering heating-cooling cycles

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Science China(Technological Sciences) 2011年第7期54卷 1661-1667页

作者： Moonseo PARK Sunhongmin Jeehee LIM Jong min choi Hangseok choi School of civil Environmental and Architectural Engineering Korea University Seoul Republic of Korea Department of Mechanical Engineering Hanbat National University Daejeon Republic of Korea

The applicability of cement grout （or cement-based grout） has been considered as an alternative to bentonite grout commonly used to backfill closed-loop vertical ground heat exchangers. In a geothermal heat pump system, repeated heating-cooling cycles may cause adverse effects on the integrity of cement grout in the ground heat exchanger. To account for the temperature cycling effect, the strength degradation of cement grout due to temperature cycling has been examined by measuring the unconfined compression strength of cured specimens in a humidity-temperature controlling chamber with applying temperature cycles between -5℃ and 50℃. There is a tendency that the unconfined compression strength decreases with an increase in the number of temperature cycles. On the other hand, an equivalent hydraulic conductivity of a pipe-embedded cement grout specimen was evaluated by carrying out a modified flexible wall permeameter test equipped with a water circulating system to control temperature inside the pipe section. The applied operating temperature range was from 5 to 35℃. After three cycles of heating-cooling circulation, the equivalent hydraulic conductivity becomes asymptotic to a constant value, which implies there is no severe detachment of the pipe from the cement grout.

关键词： cement grout bentonite grout thermal conductivity workability equivalent permeability coefficient

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