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The H∞ Robust Stability and Performance Conditions for Uncertain Robot Manipulators

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 270-272页

作者： Geun Il Song hae Yeon Park Jung Hoon kim the Department of Electrical Engineering Pohang University of Science and Technology (POSTECH) the Department of Electrical Engineering Pohang University of Science and Technology (POSTECH) the Institute for Convergence Research and Education in Advanced Technology Yonsei University

Dear Editor,H∞This letter develops a new framework for the robust stability and performance conditions as well as the relevant controller synthesis with respect to uncertain robot *** often exist model uncertainties between the nominal model and the real robot manipulator and disturbances. Hence, dealing with their effects plays a crucial role in leading to high tracking performances, as discussed in [1]–[5].

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Herbal medicine use in Republic of Korea to alleviate side effects of COVID-19 vaccines:A cross-sectional study

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Journal of Integrative Medicine 2023年第4期21卷 361-368页

作者： hae-Chang yoon Department of Public Health Graduate School of Kyungpook National UniversityDaegu 41944Republic of Korea

Objective:Coronavirus disease 2019(COVID-19)has spread worldwide,and several virus variants have *** are administered to help prevent the *** Republic of Korea,most people take herbal *** study investigated the use of herbal medicine to counter the side effects of COVID-19 ***:This cross-sectional study was conducted using an online ***-square tests were used to determine differences in the use of herbal medication according to sociodemographic *** two-sample and paired t-tests were performed to examine the effect and satisfaction of herbal medicine use for countering the side effects of COVID-19 ***-way analysis of variance was used to determine vaccine-related ***:A total of 233 and 181 participants received the first and second doses of COVID-19 vaccines,*** majority of herbal medicine users were in their thirties,had a bachelor’s degree,suffered from side effects of vaccination,and received Vaxzevria for their first COVID-19 vaccine dose and Comirnaty for their second *** herbal medicine group had a higher satisfaction level of postvaccination side effects than the non-herbal medicine group(P<0.0001).The numeric rating scale scores for vaccination side effects were lower among participants who took herbal medication to alleviate those symptoms(P<0.0001).The most commonly used herbal formula was ***:A third of participants receiving COVID-19 vaccines used herbal medication to counter the side effects of *** use of herbal medicine was associated with age,education level,vaccine brand,and whether side effects of vaccination *** medication use was associated with greater satisfaction compared to vaccine recipients not using herbal medication.

关键词： COVID-19 vaccines Herbal medicine Side effects Republic of Korea

Supersonically sprayed self-aligne d rGO nanosheets and ZnO/ZnMn_(2)O_(4)nanowires for high-energy and high-power-density supercapacitors

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Journal of Materials Science & Technology 2023年第6期137卷 193-204页

作者： Chanwoo Park Edmund Samuel Byeong-Yeop kim Seongpil An hae-Seok Lee Sam S.yoon School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversityRepublic of Korea SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Core-shell-type bimetallic oxide and carbon composites comprising zinc oxide(ZnO)nanospheres and zinc manganese oxide(ZnMn_(2)O_(4))nanowires were produced by a hydrothermal method,and supersoni-cally sprayed together with reduced graphene oxide(rGO)nanosheets onto Ni foil to fabricate flexible *** supersonic impact facilitated the exfoliation of the rGO nanosheets,thereby increasing the surface area and adhesion of the composite particles to the *** rGO nanosheets were vertically aligned during the supersonic impact and formed localized zones,enabling optimal accommodation of the ZnO/ZnMn_(2)O_(4)*** localization,with the addition of rGO,reduced the agglomeration of ZnO/ZnMn_(2)O_(4)*** molar concentration of MnSO_(4)used in the synthesis of ZnO/ZnMn_(2)O_(4)was varied from 0.05 to 0.15 mol/L to determine the optimal MnSO_(4)concentration that would result in the highest energy storage *** unique nanostructure of ZnO/ZnMn_(2)O_(4)and the self-alignment of rGO sheets facilitated a favorable environment for high energy storage capability with a specific capaci-tance of 276.3 mF·cm^(−2)at a current density of 0.5 mA·cm^(−2)and an energy density of 98.2μWh·cm^(−2)at a power density of 1600μW·cm^(−2).The width of the potential window was increased to 1.2 V,imply-ing a significant increase in the energy storage capability of the *** retention of 88%was achieved after 10,000 charge/discharge cycles for the supercapacitor fabricated using an optimal MnSO_(4)concentration(0.10 mol/L)during the composite synthesis.

关键词： ZnO/ZnMn_(2)O_(4)nanowires rGO nanosheets Hydrothermal method Supersonic spraying Supercapacitor

Investigation of cell mechanics using single-beam acoustic tweezers as a versatile tool for the diagnosis and treatment of highly invasive breast cancer cell lines: an in vitro study

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Microsystems & Nanoengineering 2020年第1期6卷 927-938页

作者： hae Gyun Lim Hsiao-Chuan Liu Chi Woo yoon Hayong Jung Min Gon kim Changhan yoon Hyung Ham kim KKirk Shung Department of Creative IT Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Biomedical Engineering Inje UniversityGimhaeGyeongnam 50834Republic of Korea

Advancements in diagnostic systems for metastatic cancer over the last few decades have played a significant role in providing patients with effective treatment by evaluating the characteristics of cancer *** the progress made in cancer prognosis,we still rely on the visual analysis of tissues or cells from histopathologists,where the subjectivity of traditional manual interpretation *** paper presents the development of a dual diagnosis and treatment tool using an in vitro acoustic tweezers platform with a 50MHz ultrasonic transducer for label-free trapping and bursting of human breast cancer *** cancer cell detection and classification,the mechanical properties of a single cancer cell were quantified by single-beam acoustic tweezers(SBAT),a noncontact assessment tool using a focused acoustic ***-mimicking phantoms and agarose hydrogel spheres(AHSs)served to standardize the biomechanical characteristics of the *** on the analytical comparison of deformability levels between the cells and the AHSs,the mechanical properties of the cells could be indirectly measured by interpolating the Young’s moduli of the *** a result,the calculated Young’s moduli,i.e.,1.527kPa for MDA-MB-231(highly invasive breast cancer cells),2.650kPa for MCF-7(weakly invasive breast cancer cells),and 2.772 kPa for SKBR-3(weakly invasive breast cancer cells),indicate that highly invasive cancer cells exhibited a lower Young’s moduli than weakly invasive cells,which indicates a higher deformability of highly invasive cancer cells,leading to a higher metastasis ***-cell treatment may also be carried out by bursting a highly invasive cell with high-intensity,focused ultrasound.

关键词： diagnosis treatment weakly

Study of material removal behavior on R-plane of sapphire during ultra-precision machining based on modified slip-fracture model

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Nanotechnology and Precision Engineering 2020年第3期3卷 141-155页

作者： Suk Bum Kwon Aditya Nagaraj hae-Sung yoon Sangkee Min Department of Mechanical Engineering University of Wisconsin-Madison1513 University AvenueMadisonWI 53706United States of America School of Aerospace and Mechanical Engineering Korea Aerospace University76 Hanggongdaehak-roDeogyang-guGoyang-siGyeonggi-do 10540Republic of Korea

In this paper, the modified slip/fracture activation model has been used in order to understand the mechanism of ductile-brittle transition on the R-plane of sapphire during ultra-precision machining by reflecting direction of resultant force. Anisotropic characteristics of crack morphology and ductility of machining depending on cutting direction were explained in detail with modified fracture cleavage and plastic deformation parameters. Through the analysis, it was concluded that crack morphologies were mainly determined by the interaction of multiple fracture systems activated while, critical depth of cut was determined by the dominant plastic deformation parameter. In addition to this, by using proportionality relationship between magnitude of resultant force and depth of cut in the ductile region, an empirical model for critical depth of cut was developed.

关键词： Ductile-brittle transition Crack morphology Single crystal sapphire Deformation mechanism Orthogonal cutting Ultra-precision machining

Dietary flavonoid intake and risk of stomach and colorectal cancer

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World Journal of Gastroenterology 2013年第7期19卷 1011-1019页

作者： hae Dong Woo Jeongseon kim Molecular Epidemiology Branch Division of Cancer Epidemiology and PreventionResearch InstituteNational Cancer CenterGyeonggi-do 410-769South Korea

Stomach and colorectal cancers are common cancers and leading causes of cancer *** the alimentary tract can interact directly with dietary components,stomach and colorectal cancer may be closely related to dietary *** systematically searched published literature written in English via PubMed by searching for terms related to stomach and colorectal cancer risk and dietary flavonoids up to June 30,***-three studies out of 209 identified articles were finally selected for the *** point effect estimates and the corresponding standard errors were calculated using covariate-adjusted point effect estimates and 95%CIs from the selected *** dietary flavonoid intake was not associated with a reduced risk of colorectal or stomach cancer [odds ratio(OR)(95%CI) = 1.00(0.90-1.11) and 1.07(0.70-1.61),respectively].Among flavonoid subclasses,the intake of flavonols,flavan-3-ols,anthocyanidins,and proanthocyanidins showed a significant inverse association with colorectal cancer risk [OR(95%CI) = 0.71(0.63-0.81),0.88(0.79-0.97),0.68(0.56-0.82),and 0.72(0.61-0.85),respectively].A significant association was found only between flavonols and stomach cancer risk based on a limited number of selected studies [OR(95%CI) = 0.68(0.46-0.99)].In the summary estimates from casecontrol studies,all flavonoid subclasses except flavones and flavanones were inversely associated with colorectal cancer risk,whereas neither total flavonoids nor any subclasses of flavonoids were associated with colorectal cancer risk in the summary estimates based on the cohort *** significant association between flavonoid subclasses and cancer risk might be closely related to bias derived from the case-control *** was no clear evidence that dietary flavonoids are associated with reduced risk of stomach and colorectal cancer.

关键词： Flavonoids Flavonols Flavones Flavanones Flavan-3-ols Anthocyanidins Proanthocyanidins Cancer risk Meta-analysis

Effect of change of sand properties on travel distance of ricocheted debris

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Defence Technology（防务技术） 2021年第4期17卷 1486-1495页

作者： yoon Keon kim Woo Chun Choi Department of Mechanical Engineering Korea University145 Anam-roSeongbuk-guSeoul02841Republic of Korea

The debris from exploded buildings can ricochet after colliding with the ground,thus increasing the debris travel distance and danger from any associated impacts or *** reduce this danger,the travel distance of ricocheted debris must be accurately *** study analyzed the change in the travel distance of ricocheted concrete debris relative to changes in the properties of a sand *** shear tests were conducted to measure the change in internal friction angle as a function of temperature and water content of the *** element analysis(FEA)was then applied to these variables to predict the speed and angle of the debris after *** FEA results were compared with results of low-speed ricochet experiments,which employed variable temperature and water *** travel distance of the debris was calculated using MATLAB,via trajectory equations considering the drag *** the internal friction angle decreased,the shear stress decreased,leading to deeper penetration of the debris into the *** the loss of kinetic energy increased,the velocity and travel distance of the ricocheted debris *** in the ricochet velocity and travel distance of the debris,according to changes in the internal friction angle,indicated that the debris was affected by the environment.

关键词： Ricochet Exploded debirs Environmental change Sand Temperature Water content Internal friction angle Travel distance

Beta-phase transformation of polyvinylidene fluoride with supersonically sprayed ZnSnO_(3) cuboids for flexible piezoelectric nanogenerators

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Journal of Materials Science & Technology 2024年第10期177卷 103-113页

作者： Bhavana Joshi Taegun kim Woojin Lim Edmund Samue Chanwoo Park Ali Aldalbahi Mohamed El-Newehy hae-Seok Lee Seongpil An Sam S.yoon School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Core Component Technology Team Samsung Electronics Co Ltd.Mobile R&D CenterSamsung-roSuwon-siGyeonggi-doRepublic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversitySeoul 02841Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano Science and Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Flexible self-powered electromechanical devices,such as piezoelectric nanogenerators(PENGs),which are used in wearable and implantable devices,are emerging as state-of-the-art clean energy *** this study,a scalable supersonic spraying technique was used to prepare flexible piezocomposite films of polyvinylidene fluoride(PVDF)and hydrothermally synthesized ZnSnO_(3)(ZSO)cubes for *** spectra confirmed that the transformation of the α-phase of PVDF to its β-phase was induced by the shear stress generated between the ZSO particles and PVDF polymer during supersonic *** op-timized sample comprising 0.43 g of ZSO cubes and 1 g of PVDF produced a maximum piezopotential of 41.5 V and a short-circuit current,I_(sc),of 52.5 μA.A maximum power density of 50.6 μW cm-2 was ob-tained at a loading resistance of 0.4 MΩ,which matched the impedance of the ***-term tapping and bending cycles of N_(tap)=4200 and N_(bend)=600 yielded piezopotentials of 40.5 and 1.7 V,*** addition,electrical poling for 2 h increased the piezopotential to 52 V owing to the alignment of the ferroelectric dipoles in the PVDF.

关键词： ZnSnO_(3) PVDF Composite Perovskite Supersonic cold spray Piezoelectric nanogenerator

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