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Chinese Physics Letters 2012年第6期29卷 82-85页

作者： chung-seok kim Kyung-Young JHANG Automotive Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea Mechanical Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea

We present innovative nonlinear acoustics for characterizing fatigue-induced micro-damage of austenitic stainless steel 316 subjected to high-cycle *** fatigue-driven deformations are accumulated at several positions near the middle of hourglass-shaped specimens.A bell-shaped curve of acoustic nonlinearity as a function of position is observed,and the variation in acoustic nonlinearity is attributed to the evolution of a lattice defect (dislocation) and stress-induced martensite based on transmission electron microscopy (TEM) *** oblique incidence technique using a longitudinal waveform is a potentially viable method for characterizing the high-cycle fatigue deformation of austenitic stainless steel 316 alloys.

关键词： fatigue steel martensite

Precipitate Contribution to the Acoustic Nonlinearity in Nickel-Based Superalloy

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Chinese Physics Letters 2009年第8期26卷 219-222页

作者： chung-seok kim Cliff J. LISSENDEN Engineering Science and Mechanics The Pennsylvania State University 212 EES Bldg. University Park PA 16802 USA

The influence of γ′ precipitate on the acoustic nonlinearity is investigated for a nickel-based superalloy, which is subjected to creep deformation. During creep deformation, the cuboidal γ′ precipitate is preferentially coarsened in a direction perpendicular to the applied stress axis. The length and shape factor of the γ′ precipitate increase with creep time. The increase of relative acoustic nonlinearity with increasing fraction of creep life is discussed in relation to the rafting of γ′ precipitate, which is closely related to the scattering and distortion of the acoustic wave

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Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy

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Chinese Physics Letters 2012年第12期29卷 39-43页

作者： kim chung-seok JHANG Kyung-Young Metallurgy and Materials Engineering Chosun UniversitySeosuk-dongGwangju501-759South Korea Mechanical Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea

The acoustic nonlinearity of surface waves is studied to evaluate plastic deformation in aluminum alloys.A narrow-band surface wave is successfully generated by a pulsed Nd-YAG laser system consisting of a beam expander and a slit *** degrees of tensile deformation are induced by interrupting the tensile tests so as to obtain aluminum specimens with different degrees of plastic *** normalized acoustic nonlinearity increases as a function of tensile *** experimental results show that the acoustic nonlinearity of a laser-generated surface wave has a good correlation with the level of tensile deformation and has a potential to evaluate microdamage induced by dislocation microplasticity.

关键词： deformation nonlinearity Deform

Effect of modified fasting therapy on body weight, fat and muscle mass, and blood chemistry in patients with obesity

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Journal of Traditional Chinese Medicine 2016年第1期36卷 57-62页

作者： Koh-Woon kim Mi-Yeon Song seok-Hee chung Won-seok chung Department of Korean Rehabilitation Medicine College of Korean Medicine Kyung Hee University

OBJECTIVE: The aim of this study was to investigate the effects and safety of modified fasting therapy using fermented medicinal herbs and exercise on body weight, fat and muscle mass, and blood chemistry in obese ***: Twenty-six patients participated in a14-day fast, during which they ingested a supplement made from fermented medicinal herbs and carbohydrates(intake: 400-600 kcal/d). The schedule included 7 prefasting relief days and 14 days of stepwise reintroduction of food. The patients also took part in an exercise program that incorporated Qigong, weight training, and walking exercises. The efficacy of treatments was observed by assessing body fat mass and muscle mass, and alanine aminotransferase(ALT), aspartate aminotransferase(AST),cholesterol, and triglycerides in each study *** symptoms or side effects were ***: Body weight and body fat mass both decreased significantly by(5.16 ± 0.95) and(3.89 ±0.79) kg(both P < 0.05), while muscle mass decreased by an average of(0.26 ± 0.22) kg, without statistical significance. ALT levels were significantly decreased(P < 0.05), while AST levels decreased without statistical significance(P = 0.052). The levels of total cholesterol and triglycerides were also significantly decreased(both P < 0.05). There were few adverse events except for mild dizziness, which did not affect everyday ***: These results suggest that modified fasting therapy using fermented medicinal herbs and exercise could be effective and safe on obese patients.

关键词： Obesity Fasting Houttuynia Cordata Saururus Chinensis Exercise Blood chemicalanalysis Medicine, Korean traditional

Traditional Chinese medicine for gait disturbance in adrenoleukodystrophy:A case report and review of literature

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World Journal of Clinical Cases 2021年第31期9卷 9691-9698页

作者： Hyungsuk kim Taeoh kim Whisung Cho Hokyung Chang Won-seok chung Department of Korean Medicine Rehabilitation Kyung Hee UniversitySeoul 02447South Korea

BACKGROUND Adrenoleukodystrophy(ALD)is caused by a deficit in the ABCD1 gene,which leads to demyelination of neurons and dysfunction of the adrenal cortices and *** the three known phenotypes,30%-50%of male ALD patients present with the adrenomyeloneuropathy phenotype,characterized by gait disturbance as the initial *** SUMMARY A 46-year-old man with a prior diagnosis of ALD was admitted to a Korean medicine hospital for the treatment of gait *** ability to walk was severely impaired at admission,significantly affecting the patient’s quality of *** was treated with acupuncture,pharmacopuncture,electroacupuncture,and herbal medicine for 23 *** 25-Foot Walk test(25FW),timed up and go(TUG),comfortable gait speed(CGS),numeric rating scale(NRS),Berg Balance Scale(BBS),Tinetti test,manual muscle test(MMT),and 3-level version of EuroQol-5 dimension(EQ-5D-3L)were used to evaluate the *** outcomes of the 25FW,TUG,and CGS improved during *** the time of admission to discharge we observed:A decrease in NRS scores in the lower extremities and the lower back;an increase of 3 points in the BBS;a 1-point increase in the balancing part of the Tinetti Test;MMT and EQ-5D-3L performances remained *** Traditional Chinese medicine treatments could be a therapeutic option to alleviate issues related to gait disturbance in ALD.

关键词： Traditional Chinese medicine Herbal medicine Gait disturbance Adrenoleukodystrophy Adenosine triphosphate Case report

Traditional Chinese medicine for foot pain in a patient with complex regional pain syndrome: A case report

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World Journal of Clinical Cases 2023年第30期11卷 7424-7431页

作者： Woo-Chul Shin Hyungsuk kim Won-seok chung Clinical Korean Medicine Graduate SchoolKyung Hee UniversitySeoul 02447South Korea Korean Medicine Kyung Hee UniversitySeoul 02447South Korea

BACKGROUND Complex regional pain syndrome(CRPS)is characterized by pain as well as sensory,motor,and sudomotor ***,it is classified into two types CRPS-I and *** is no single diagnostic test or treatment approach for CRPS,and a multidisciplinary approach is gaining attention to improve patients’symptoms and their quality of *** SUMMARY A 35-year-old woman with an unremarkable medical history sought treatment for CRPS at a hospital of Korean *** her first visit,she was wheelchairbound due to severe pain in her left lower *** had edema and discoloration of the left *** was treated with a combination of traditional Chinese medicine(TCM)approaches,including acupuncture,moxibustion,pharmacopuncture,and herbal decoction,for approximately 20 *** foot and ankle outcome score(FAOS)and visual analog scale(VAS)score for pain were evaluated,along with general signs and *** symptoms,signs,FAOS,and VAS scores improved after treatment,with a significant 7-degree decrease in the VAS score and a 62-point increase in the FAOS ***,the foot swelling and discoloration gradually *** the phone follow-up,5 mo after the last visit,additional improvements in outcomes were *** Combined TCM treatment may be a reasonable and safe option for alleviating symptoms and improving function in patients with CRPS.

关键词： Complex regional pain syndrome Traditional Chinese medicine Acupuncture Moxibustion Herbal medicine Case report

Duodenal variceal bleeding after balloon-occluded retrograde transverse obliteration: Treatment with transjugular intrahepatic portosystemic shunt

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World Journal of Gastroenterology 2012年第22期18卷 2877-2880页

作者： Min Joung kim Byoung Kuk Jang Woo Jin chung Jae seok Hwang Young Hwan kim Department of Gastroenterology Keimyung University School of Medicine Dongsan Medical Center 194 Dongsan-dong Jung-gu Daegu 700-712 South Korea Department of Diagnostic Radiology Keimyung University School of Medicine Dongsan Medical Center 194 Dongsan-dong Jung-gu Daegu 700-712 South Korea

We report a case of duodenal varix bleeding as a long term complication of balloon occluded retrograde transvenous obliteration (BRTO), which was successfully treated with a transjugular intrahepatic portosystemic shunt (TIPS). A 57-year-old man was admitted to the emergency room suffering from melena. He had under-gone BRTO to treat gastric varix bleeding 5 mo before admission. Endoscopy and a computed tomography (CT) scan showed complete obliteration of the gastric varix, but the nodular varices in the second portion of the duodenum expanded after BRTO, and spurting blood was seen. TIPS was performed for treatment of duodenal variceal bleeding, because attempts at endoscopic varix ligation were unsuccessful. The post-operative course was uneventful and the patient was discharged without complications. A follow up CT scan obtained 21 mo after TIPS revealed a patent TIPS tract and complete obliteration of duodenal varices, but multinodular hepatocellular carcinoma had developed. He died of hepatic failure 28 mo after TIPS.

关键词： Duodenal variceal bleeding Balloon occlud-ed retrograde transvenous obliteration Transjugularintrahepatic portosystemic shunt

Asymmetric optical camouflage:tuneable reflective colour accompanied by the optical Janus effect

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Light(Science & Applications) 2020年第1期9卷 325-334页

作者： Taehyun kim Eui-Sang Yu Young-Gyu Bae Jongsu Lee In Soo kim seok chung Seung-Yeol Lee Yong-Sang Ryu Sensor System Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Micro/Nano Systems Korea UniversitySeoul 02841Republic of Korea School of Electronic and Electrical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Nanophotonics Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea

Going beyond an improved colour gamut,an asymmetric colour contrast,which depends on the viewing direction,and its ability to readily deliver information could create opportunities for a wide range of applications,such as nextgeneration optical switches,colour displays,and security features in anti-counterfeiting ***,we propose a simple Fabry–Perot etalon architecture capable of generating viewing-direction-sensitive colour contrasts and encrypting pre-inscribed information upon immersion in particular solvents(optical camouflage).Based on the experimental verification of the theoretical modelling,we have discovered a completely new and exotic optical phenomenon involving a tuneable colour switch for viewing-direction-dependent information delivery,which we define as asymmetric optical camouflage.

关键词： asymmetric generating readily

Atomistic investigation of pressure effects on sintering of bimetallic core-shell nanoparticles

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Journal of Materials Science & Technology 2024年第17期184卷 64-74页

作者： Juheon kim Hayoung chung Department of Mechanical Engineering Ulsan National Institute of Science and Technology50 Unist-gilUlsan 44919South Korea

Pressure-assisted sintering(PAS)utilizing bimetallic core-shell nanoparticles(CS NPs)has garnered widespread attention for its ability to produce advanced components with excellent thermal and elec-trical conductivities,even at low *** study presents the first investigation into the PAS of bimetallic CS NPs,using Ag-coated Cu material as a representative system,through all-atom molecu-lar dynamics(MD)*** study provides detailed insights into the atomic-scale processes and mechanisms that govern pressure-assisted sintering,elucidating the coalescence phenomena and reveal-ing the significant influence of external *** comparing atomistic behaviors,such as diffusion,migration,and microstructure evolution,between PAS and thermal sintering,a deeper understanding of the underlying mechanisms is ***,the results highlight the importance of considering microstructural characteristics in addition to void fraction assessment for accurately estimating mechani-cal *** study enhances our understanding of sintering methods and offers a new perspective on designing process conditions in the PAS process.

关键词： Core-shell nanoparticles Pressure-assisted sintering Molecular dynamics simulation Many-particle model Microstructure Mechanical properties

DC Motor Speed Regulator via Active Damping Injection and Angular Acceleration Estimation Techniques

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 641-647页

作者： seok-Kyoon kim Choon Ki Ahn Department of Creative Convergence Engineering Hanbat National UniversityDaejeon 341-58Republic of Korea School of Electrical Engineering Korea UniversitySeoul 136-701Republic of Korea

This paper suggests a novel model-based nonlinear DC motor speed regulator without the use of a current *** current dynamics,machine parameters and mismatched load variations are *** proposed controller is designed to include an active damping term that regulates the motor speed in accordance with the first-order low-pass filter dynamics through the pole-zero ***,the angular acceleration and its reference are obtained from simple first-order estimators using only the speed *** effectiveness is experimentally verified using hardware comprising the QUBEServo2,myRIO-1900,and LabVIEW.

关键词： Active damping injection angular acceleration estimator DC motor(DCM) speed regulation