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The nonlinear optical properties of a magneto-exciton in a strained Ga_(0.2)In_(0.8)As/GaAs quantum dot

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Chinese Physics B 2013年第10期22卷 479-485页

作者： N.R.Senthil Kumar A.John Peter chang kyoo yoo Department of Physics SBM College of Engineering and Technology Department of Physics Govt.Arts CollegeMelur-625 106MaduraiIndia Center for Environmental Studies/Green Energy Center Deptartment of Environmental Science and EngineeringCollege of EngineeringKyung Hee UniversitySeocheon-dong 1Giheung-guYongin-SiGyeonggi-Do446-701South Korea

The magnetic field-dependent heavy hole excitonic states in a strained ***/GaAs quantum dot are investi- gated by taking into account the anisotropy, non-parabolicity of the conduction band, and the geometrical confinement. The strained quantum dot is considered as a parabolic dot of InAs embedded in a GaAs barrier material. The dependence of the effective excitonic g-factor as a function of dot radius and the magnetic field strength is numerically measured. The interband optical transition energy as a function of geometrical confinement is computed in the presence of a mag- netic field. The magnetic field-dependent oscillator strength of interband transition under the geometrical confinement is studied. The exchange enhancements as a function of dot radius are observed for various magnetic field strengths in a strained ***/GaAs quantum dot. Heavy hole excitonic absorption spectra, the changes in refractive index, and the third-order susceptibility of third-order harmonic generation are investigated in the Gao.2Ino.8As/GaAs quantum dot. The result shows that the effect of magnetic field strength is more strongly dependent on the nonlinear optical property in a low-dimensional semiconductor system.

关键词： oscillator strength exciton quantum dot

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Polaron Effect of a Two Electron Parabolic Quantum Dot

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Communications in Theoretical Physics 2013年第6期59卷 763-768页

作者： S.Saravana Kumar A.John Peter chang kyoo yoo Department of Physics Nadar Saraswathi College of Engineering and Tecchnology Vadapudupatti Department of Physics Government Arts College Center for Environmental Studies/Green Energy Center Department of Environmental Science and Engineering Collegeof Engineering Kyung Hee University

Polaron induced double electron in a quantum dot is investigated using the exact diagonalization techniques and the compact density-matrix approach. The dependence of nonlinear optical processes on the incident photon energies and the polaronic effect are brought out. The linear, third order non-linear optical absorption coefficients and the refractive index changes of singlet and triplet states as a function of photon energy are obtained with and without the inclusion of polaronic effect. It is found that the geometrical confinement and the effect of polaron have great influence on the optical properties of dots.

关键词： parabolic quantum dot correlation energy semiconductor

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Real-Time Demand Response Management for Controlling Load Using Deep Reinforcement Learning

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Computers, Materials & Continua 2022年第12期73卷 5671-5686页

作者： Yongjiang Zhao Jae Hung yoo chang Gyoon Lim Department of Computer Engineering Chonnam National UniversityYeosu59626Korea

With the rapid economic growth and improved living standards,electricity has become an indispensable energy source in our ***,the stability of the grid power supply and the conservation of electricity is *** following are some of the problems facing now:1)During the peak power consumption period,it will pose a threat to the power *** and improving the power distribution infrastructure requires high maintenance costs.2)The user’s electricity schedule is unreasonable due to personal behavior,which will cause a waste of *** load as a vital part of incentive demand response(DR)can achieve rapid response and improve demand-side *** load by manually formulating rules,some devices are selective to be adjusted during peak power ***,it is challenging to optimize methods based on manual *** paper uses SoftActor-Critic(SAC)as a control algorithm to optimize the control *** results show that through the coordination of the SAC to control load in CityLearn,realizes the goal of reducing both the peak load demand and the operation costs on the premise of regulating voltage to the safe limit.

关键词： Demand response controlling load SAC CityLearn

Sensitivity evaluation of the flash flood warning system introduced to ungauged small mountainous basins in Korea

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Journal of Mountain Science 2019年第5期16卷 971-993页

作者： yoo Chulsang LEE Jinwook chang Kwonhee YANG Dongmin School of Civil Environmental and Architectural Engineering College of Engineering Korea University NOAA SNC Co. Ltd.

This study evaluates the uncertainty involved in the determination of the flash flood guidance(FFG) of the flash flood warning system(FFWS) for a small mountainous region(FFWS_MR)in Korea. The sensitivity is evaluated both at each step to determine the FFG and for all steps together. The results show that the relative difference of the FFG is about 50% of the current system, most of which involves the channel width. Especially, the use of some specific empirical equations to estimate the major parameters results in a considerable amount of the relative difference of the FFG. In addition, though only four basins were field-surveyed, it is found that the indirect estimation of the major parameters always introduces some amount of additional uncertainty. In conclusion, accurate estimation of the major parameters must be the most important procedure to derive an accurate FFG, among which the channel cross-section at the exit of the basin lies at the center.

关键词： Flash flood warning system Flash flood guidance Sensitivity analysis

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A Novel Goodness of Fit Test Spectrum Sensing Using Extreme Eigenvalues

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Chinese Journal of Electronics 2020年第6期29卷 1201-1206页

作者： LI He ZHAO Wenjing LIU chang JIN Minglu yoo Sang-Jo School of Information and Communication Engineering Dalian University of Technology Department of Information and Communication Engineering Inha University

The existing Goodness of fit(GoF) test based spectrum sensing algorithms mostly use samples or energies as observations to make decisions,which can hardly achieve satisfactory performance especially when the Primary user(PU) signals are highly ***,the eigenvalue of covariance matrix can reflect signal correlations *** by this,we study the distribution of eigenvalue and propose an eigenvalue based GoF spectrum sensing *** the proposed scheme,we use the ratios of maximum to minimum eigenvalue as observations and thus it can bring performance improvements through capturing correlation of PU *** also provide the related theoretical analysis for the proposed *** results show that the proposed method overcomes the problem of noise uncertainty and achieves performance improvement over the classical samples-based GoF test.

关键词： correlation methods covariance matrices eigenvalues and eigenfunctions radio spectrum management signal denoising signal detection signal sampling eigenvalue based GoF spectrum sensing algorithm goodness of fit test spectrum sensing algorithm GoF test based spectrum sensing algorithm primary user signal covariance matrix eigenvalue signal correlation Cognitive radio spectrum sensing goodness of fit test eigenvalue

Obesity and novel management of inflammatory bowel disease

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World Journal of Gastroenterology 2023年第12期29卷 1779-1794页

作者： Jee Hyun Kim chang-Myung Oh Jun Hwan yoo Department of Gastroenterology CHA Bundang Medical CenterCHA University School of MedicineSeongnam 13496South Korea Department of Biomedical Science and Engineering Gwangju Institute of Science and TechnologyGwangju 62465South Korea Institute of Basic Medical Sciences CHA University School of MedicineSeongnam 13496South Korea

Obesity is prevalent within the inflammatory bowel disease(IBD)population,particularly in newly developed *** epidemiological studies have suggested that 15%-40%of IBD patients are obese,and there is a potential role of obesity in the pathogenesis of *** dysfunction of mesenteric fat worsens the inflammatory course of Crohn’s disease and may induce formation of strictures or ***,obesity may affect the disease course or treatment response of *** the increasing data supporting the pathophysiologic and epidemiologic relationship between obesity and IBD,obesity control is being suggested as a novel management for ***,this review aimed to describe the influence of obesity on the outcomes of IBD treatment and to present the current status of pharmacologic or surgical anti-obesity treatments in IBD patients.

关键词： Obesity Inflammatory bowel disease Crohn’s disease Ulcerative colitis

Ultrasonographic evaluation of the effect of extracorporeal shock wave therapy on calcific tendinopathy of the rectus femoris tendon:A case report

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World Journal of Clinical Cases 2019年第22期7卷 3772-3777页

作者： chang Han Lee Min-Kyun Oh Jun-Il yoo Department of Rehabilitation Medicine Gyeongsang National University School of Medicine and Gyeongsang National University HospitalJinju 52727South Korea Department of Orthopaedic Surgery School of MedicineGyeongsang National University90 ChilamdongGyeongsangnam-doJinju 52727South Korea

BACKGROUND Calcific tendinopathy denotes calcific deposits in a specific *** is also known as calcifying tendinitis,calcifying periarticulitis,or periarticular apatite deposition ***,extracorporeal shock wave therapy(ESWT)has been reported to be effective in relieving and treating pain in calcific *** SUMMARY A 36-year-old female patient suffered from left hip joint pain for six *** pain was increased during abduction of the hip,waking,and jumping.B-mode ultrasonography was performed by a physiatrist with an L12-5 linear transducer.A single session of ESWT was given in the marking area under ultrasound guidance at 4 Hz,2500 shots with intensity of stimulation using energy of 0.1 mJ/*** hip pain of the patient slowly decreased within 4 wk after starting the *** six weeks of ESWT,her hip pain was completely ***,the size of calcification showed almost no reduction in simple radiography at the final *** Ultrasonography is a very good modality not only for diagnosing calcified tendinitis by classical appearance,but also for evaluating the effect of ESWT during the follow-up period.

关键词： Rectus femoris Calcific tendinopathy Extracorporeal shock wave therapy Ultrasonography Hip Joint Case report

Amputation stump management:A narrative review

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World Journal of Clinical Cases 2022年第13期10卷 3981-3988页

作者： yoo Jin Choo Du Hwan Kim Min Cheol chang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaegu 705-717South Korea Department of Physical Medicine and Rehabilitation College of MedicineChung-Ang UniversitySeoul 06973South Korea Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityTaegu 705-717South Korea

In this review intended for medical staff involved in patient rehabilitation,we provided an overview of the basic methods for managing amputation *** the amputation surgery,it is imperative to optimize the remaining physical abilities of the amputee through rehabilitation processes,including postoperative rehabilitation,desensitization,and continuous application of soft or rigid dressings for pain reduction and shaping of the *** on the situation,a prosthesis may be worn in the early stage of recovery or an immediate postoperative prosthesis may be applied to promote stump ***,to maintain the range of motion of the stump and to prevent deformation,the remaining portion of the limb should be positioned to prevent *** exercises should also be performed to improve muscle strength to ensure that the amputee is able to perform activities of daily living,***,clean wound or edema management of the stump is necessary to prevent problems associated with wearing the *** review is expected to contribute to the establishment of basic protocols that will be useful for stump management from the time of completion of amputation surgery to the fitting of a prosthesis to optimize patient recovery.

关键词： Amputation Amputee Management Rehabilitation Stump Review

Micro/nano-wrinkled elastomeric electrodes enabling high energy storage performance and various form factors

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Carbon Energy 2023年第12期5卷 137-152页

作者： changeun yoo Seokmin Lee Yongkwon Song Woojae chang Moon Kyu Park Younji Ko Jinhan Cho Department of Chemical and Biological Engineering Korea UniversitySeoulSeongbuk-guRepublic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulSeongbuk-guRepublic of Korea Soft Hybrid Materials Research Center Advanced Materials Research DivisionKorea Institute of Science and Technology(KIST)Seongbuk-guSeoulRepublic of Korea

Stretchable elastomer-based electrodes are considered promising energy storage electrodes for next-generation wearable/flexible electronics requiring various shape ***,these elastomeric electrodes suffer from the limited electrical conductivity of current collectors,low charge storage capacities,poor interfacial interactions between elastomers and conductive/active materials,and lack of shape *** this study,we report hierarchically micro/nano-wrinkle-structured elastomeric electrodes with notably high energy storage performance and good mechanical/electrochemical stabilities,simultaneously allowing various form *** this study,a swelling/deswelling-involved metal nanoparticle(NP)assembly is first performed on thiol-functionalized polydimethylsiloxane(PDMS)elastomers,generating a micro-wrinkled structure and a conductive seed layer for subsequent *** the assembly of metal NPs,the conformal electrodeposition of Ni and NiCo layered double hydroxides layers with a homogeneous nanostructure on the micro-wrinkled PDMS induces the formation of a micro/nano-wrinkled surface morphology with a large active surface area and high electrical *** on this unique approach,the formed elastomeric electrodes show higher areal capacity and superior rate capability than conventional elastomeric electrodes while maintaining their electrical/electrochemical properties under external mechanical *** notable mechanical/electrochemical performance can be further enhanced by using spiral-structured PDMS(stretchability of~500%)and porous-structured PDMS(areal capacity of~280μAh cm^(-2)).

关键词： elastomeric electrodes electrodeposition micro/nano-wrinkled structures