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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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PopFlow:a novel flow management scheme for SDN switch of multiple flow tables based on flow popularity

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Frontiers of Computer Science 2020年第6期14卷 111-122页

作者： Cheng WANG kyung Tae KIM hee Yong YOUN College of Electrical and Computer Engineering Sungkyunkwan UniversitySuwon 16419Korea College of Software Sungkyunkwan UniversitySuwon 16419Korea

Pipeline processing is applied to mutiple flow tables(MFT)in the switch of software-defined network(SDN)to increase the throughput of the ***,the processing time of each flow increases as the size or number of flow tables gets *** this paper we propose a novel approach called PopFlow where a table keeping popular flow entries is located up front in the pipeline,and an express path is provided for the flow matching the table.A Markov model is employed for the selection of popular entries considering the match latency and match frequency,and Queuing theory is used to model the flow processing time of the existing MFT-based schemes and the proposed *** simulation reveals that the proposed scheme substantially reduces the flow processing time compared to the existing schemes,and the diference gets more significant as the flow arrival rate increases.

关键词： edge computing SDN pipeline processing PopFlow match frequency and latency markov model-based prediction

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Implementation of Turbulent Mixing over a Stratocumulus-Topped Boundary Layer and Its Impact in a GCM

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Advances in Atmospheric Sciences 2009年第5期26卷 995-1004页

作者： Sun-hee SHIN kyung-Ja HA Division of Earth Environmental System Pusan National University

The effect of a vertical diffusion scheme over a stratocumulus topped boundary layer （STBL） was investigated using the YONU AGCM （Yonsei University Atmospheric General Circulation Model）. To consider the impact of clouds on the turbulence production, the turbulence mixing term, driven by radiative cooling at the cloud top, is implemented as an extended non-local diffusion scheme. In the model with this new scheme, the STBL parameterization significantly influences the lower atmosphere over the tropical and subtropical regions. Consideration of the turbulent mixing within the cloud layer leads to continuous stratocumulus formation. The cloud-top radiative cooling tends to favor more rapid entrainment and produces top-down turbulent mixing. This cooling develops a mixed layer without initiation of deep convection by surface fluxes. Variations in thermodynamical and dynamical features are produced by planetary boundary layer （PBL） cloud development. The simulated stratocumulus induces more mixing of heat and moisture due to the cloud forcing. Over STBL regions, the lower boundary layer becomes warmer and drier. It also weakens vertical motion and zonal trade winds in the eastern Pacific, which indicates that stratocumulus cloud cover plays a role in weakening the Walker circulation; that is, cloud cover damps the tropical circulation.

关键词： stratocumulus topped boundary layer non-local diffusion scheme tropical circulation general circulation model

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Cholecystectomy increases the risk of metabolic syndrome in the Korean population:a longitudinal cohort study

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Hepatobiliary Surgery and Nutrition 2023年第4期12卷 523-533,I0023页

作者： Ji Hye Huh Kyong Joo Lee Yun kyung Cho Shinje Moon Yoon Jung Kim kyung-Do Han Jun Goo Kang Seong Jin Lee Sung-hee Ihm Department of Internal Medicine Hallym University College of MedicineChuncheonRepublic of Korea Department of Internal Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea Department of Statistics and Actuarial Science Soongsil UniversitySeoulRepublic of Korea

Background:Cholecystectomy is a common surgical procedure to treat symptomatic gallstones;however,the long-term outcomes after cholecystectomy are ***,we aimed to investigate whether incident metabolic syndrome(MetS)is associated with cholecystectomy through a large,population-based,longitudinal ***:Subjects aged≥20 years who underwent cholecystectomy from 2010 to 2014(n=76,485)and controls(n=76,485),matched for age and sex,were identified from the Korean National Health Insurance *** proportional hazards analyses were performed to evaluate the association between cases and incident MetS,and hazard ratios and 95% confidence intervals(CIs)were ***:A total of 152,970 patients were *** age was 52.47±12.76 years,and 50.65% of participants were *** the follow-up period,there were 38,979(25.48%)newly diagnosed MetS cases in the study *** risk of MetS in the cholecystectomy group was approximately 20% higher than that in the control group[adjusted odds ratio(OR),1.20;95%CI:1.17-1.23].In the fully adjusted models,the corresponding ORs for new-onset high waist circumference(WC),low high-density lipoprotein cholesterol(HDL-C)levels,high triglycerides(TG)levels,high blood pressure(BP),and high blood glucose levels were 1.16(1.13-1.19),1.19(1.16-1.22),1.25(1.22-1.28),1.27(1.23-1.31),and 1.21(1.18-1.24),*** was an independent risk factor of incident MetS,after adjusting for potential confounding *** the subgroup analyses,the cholecystectomy group had a higher risk of MetS than the control group in subjects without hypertension or dyslipidemia,***:In this large,population-based study,cholecystectomy was associated with an increased risk of developing MetS,independent of other confounding ***,careful monitoring of metabolic variables and long-term follow-up are required to evaluate MetS risk after cholecystectomy.

关键词： Cholecystectomy metabolic syndrome(MetS) obesity diabetes cardiovascular risk

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Determining node duty cycle using Q-learning and linear regression for WSN

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Frontiers of Computer Science 2021年第1期15卷 17-23页

作者： Han Yao HUANG kyung Tae KIM hee Yong YOUN College of Software Sungkyunkwan UniversitySuwon 440-746Korea

Wireless sensor network(WSN)is effective for monitoring the target environment,which consists of a large number of sensor nodes of limited *** efficient medium access control(MAC)protocol is thus imperative to maximize the energy efficiency and performance of *** most existing MAC protocols are based on the scheduling of sleep and active period of the nodes,and do not consider the relationship between the load condition and *** this paper a novel scheme is proposed to properly determine the duty cycle of the WSN nodes according to the load,which employs the Q-leaming technique and function approximation with linear *** allows low-latency energy-efficient scheduling for a wide range of traffic conditions,and effectively overcomes the limitation of Q-learning with the problem of continuous state-action ***3 simulation reveals that the proposed scheme significantly improves the throughput,latency,and energy efficiency compared to the existing fully active scheme and S-MAC.

关键词： wireless sensor network media access control duty-cycle scheduling Q-leaming linear regression

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Surface Waves in a Relativistic Plasma Stream Propagating in a Duct: Kinetic Theory

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Journal of Modern Physics 2022年第7期13卷 1065-1079页

作者： hee J. Lee Young kyung Lim kyunggi-do Namyangju-si Hwado-eup Biryong-ro 321 South Korea Department of Radiation Oncology National Cancer Center Goyang South Korea

Dispersion relation of surface waves generated by a relativistic plasma stream in an infinite duct surrounded by vacuum is derived by means of relativistic Vlasov equation. The kinematic boundary condition imposed on the distribution function, the specular reflection conditions on the four sides of duct, can be satisfied by placing infinite number of fictitious surface charge sheets spaced by the duct widths. By placing appropriate fictitious surface charge sheets one can effectively deal with the extended electric field introduced in the Vlasov equation and treat kinetically the surface waves in semi-infinite, slab, and duct plasmas on equal ground. The relativistic duct dispersion relation is compared with the earlier non-relativistic surface wave dispersion relation.

关键词： Surface Wave Relativistic Plasma Duct Slab

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Effects of coarse riblets on air flow structures over a slender delta wing using particle image velocimetry

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Chinese Journal of Aeronautics 2019年第6期32卷 1367-1379页

作者： Mahdi NILI-AHMADABADI Omid NEMATOLLAHI kyung chun KIM Department of Mechanical Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran School of Mechanical Engineering Pusan National UniversityBusan 609-735Republic of Korea

This research investigates the aerodynamic performance and flow characteristics of a delta wing with 65° sweep angle and with coarse axial riblets,and then compares with that of a smooth-surface delta *** Image Velocimetry(PIV)were utilized to visualize the flow over the wing at 6 cross-sections upright to the wing surface and parallel to the wing span,as well as 3 longitudinal sections on the leading edge,symmetry plane,and a plane between them at Angles of Attack(AOA)=20°and 30°and Re=1.2×10~5,2.4×10~5,and 3.6×10~*** effects of the riblets were studied on the vortices diameter,vortex breakdown location,vortices distance from the wing surface,flow lines pattern nearby the wing,circulation distribution,and *** results show that the textured model has a positive effect on some of the parameters related to drag reduction and lift *** riblets increase the flow momentum near the wing’s upper surface except near the *** also increase the flow momentum behind the wing.

关键词： Aerodynamic performance Coarse riblet Delta wing Flow structures Particle image velocimetry Vortex

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K2Ti6O13 Nanoparticle-Loaded Porous rGO Crumples for Supercapacitors

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Nano-Micro Letters 2020年第1期12卷 115-123页

作者： Chongmin Lee Sun kyung Kim Hankwon Chang hee Dong Jang Department of Nanomaterials Science and Engineering University of Science and TechnologyYuseong‑guDaejeon 34113Republic of Korea Resources Utilization Research Center Korea Institute of Geoscience and Mineral ResourcesYuseong‑guDaejeon 34132Republic of Korea

One-dimensional alkali metal titanates containing potassium,sodium,and lithium are of great concern owing to their high ion mobility and high specific surface *** those titanates are combined with conductive materials such as graphene,carbon nanotube,and carbon nanofiber,they are able to be employed as efficient electrode materials for *** hexa-titanate(K2Ti6O13,KTO),in particular,has shown superior electrochemical properties compared to other alkali metal titanates because of their large lattice parameters induced by the large radius of potassium ***,we present porous rGO crumples(PGC)decorated with KTO nanoparticles(NPs)for application to *** KTO NP/PGC composites were synthesized by aerosol spray pyrolysis and post-heat *** NPs less than 10 nm in diameter were loaded onto PGCs ranging from 3 to 5μ*** porous structure of the composites was obtained by the activation of rGO by adding an excessive amount of KOH to the *** KTO NP/PGC composite electrodes fabricated at the GO/KOH/TiO2 ratio of 1:3:0.25 showed the highest performance(275 F g−1)in capacitance with different KOH concentrations and cycling stability(83%)after 2000 cycles at a current density of 1 A g−1.

关键词： Potassium hexa-titanate Porous graphene crumples Supercapacitors

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Multi-objective optimization of the kinematic parameters of fish-like swimming using a genetic algorithm method

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Journal of Hydrodynamics 2019年第2期31卷 333-344页

作者： Mahdi Abolfazli Esfahani Hamid Reza Karbasian kyung chun Kim Department of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore School of Mechanical Engineering Pusan National UniversityBusan 46241Korea

This paper investigates the kinematic optimization of fish-like ***,an experiment was performed to detect the motion of the fish tail foil of a fish ***,the kinematic swimming model was verified experimentally using an image processing *** model includes two rotational motions:caudal foil motion and foil-pitching *** kinematic model allows us to evaluate the influence of motion trajectory in the optimization *** optimize the propulsive efficiency and thrust,a multi-objective genetic algorithm was employed to handle with kinematic,hydrodynamic,and propulsion *** results show that the caudal length has a significant effect on the performance of the flapping foil in fish-like swimming,and its influence on the motion trajectory may increase the propulsive efficiency to as high as 98%in ideal *** maximum thrust coefficient can also reach approximately 3 in ideal conditions.

关键词： Fish-like swimming fish robot hydrodynamics optimization genetic algorithm

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Study on the current structure of the thermohaline front in the southeastern entrance of the Yellow Sea during winter

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Acta Oceanologica Sinica 2015年第12期34卷 29-36页

作者： OH kyung-hee LEE Seok LIE Heung-Jae JUNG kyung Tae QIAO Fangli Korea Institute of Ocean Science and Technology First Institute of Oceanography State Oceanic Administration

A thermohaline front is located at the southeastern entrance of the Yellow Sea in winter, and it is generated by the intrusion of warm saline water into the Yellow Sea caused by a strong northerly wind. Recently, a westward transversal current traveling away from the west coast of Korea toward the open sea area along the front was reported. The westward transversal current is dominant in the surface layer during the temperature inversion period. The formation and structure of this current are examined using a numerical vertical ocean-slice *** two different water masses meet, a front is formed and adjusted geostrophically. In this frontal zone, a horizontal pressure gradient flow by the vertically inclined isopycnal occurs under the thermal wind process in a baroclinic effect, and the cold fresh coastal water moves westward along the front in the upper layer. The barotropic effect across the front and the bottom friction effect strengthen the westward component of the velocity. The velocity of the bottom layer decreases remarkably in the increase of the bottom drag coefficient. This means that the bottom friction with the strong background tidal current causes a reduction in the current in the bottom layer.

关键词： Geostrophic adjustment Southeastern Yellow Sea Thermohaline front Thermal wind Westward transversal current

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