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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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The Effect of Fabrication Conditions for GDC Buffer Layer on Electrochemical Performance of Solid Oxide Fuel Cells

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Nano-Micro Letters 2013年第3期5卷 151-158页

作者： jung-hoon Song Myung Geun jung Hye won Park Hyung-Tae Lim Fuel Cell Project Research Institute of Industrial Science and Technology (RIST) School of Nano & Advanced Materials Engineering Changwon National University

A Gd-doped ceria（GDC） buffer layer is required between a conventional yttria-stabilized zirconia（YSZ） electrolyte and a La-Sr-Co-Fe-O3（LSCF） cathode to prevent their chemical reaction. In this study,the effect of varying the conditions for fabricating the GDC buffer layer, such as sintering temperature and amount of sintering aid, on the solid oxide fuel cell（SOFC） performance was investigated. A finer GDC powder（i.e., ultra-high surface area）, a higher sintering temperature（1290℃）, and a larger amount of sintering aid（12%） resulted in improved densification of the buffer layer; however, the electrochemical performance of an anode-supported cell containing this GDC buffer layer was poor. These conflicting results are attributed to the formation of（Zr, Ce）O2 and/or excess cobalt grain boundaries（GBs） at higher sintering temperatures with a large amount of sintering aid（i.e., cobalt oxide）. A cell comprising of a cobalt-free GDC buffer layer, which was fabricated using a low-temperature process, had lower cell resistance and higher stability. The results indicate that electrochemical performance and stability of SOFCs strongly depend on fabrication conditions for the GDC buffer layer.

关键词： Solid oxide fuel cell(SOFC) Gd-doped ceria Sintering aid Sol-gel spin coating

Next High Performance and Low Power Flash Memory Package Structure

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Journal of Computer Science & Technology 2007年第4期22卷 515-520页

作者： jung-hoon Lee ERI Control Instrumentation EngineeringGyeongSang National UniversityJinju660-701Korea

In general, NAND flash memory has advantages in low power consumption, storage capacity, and fast erase/write performance in contrast to NOR flash. But, main drawback of the NAND flash memory is the slow access time for random read operations. Therefore, we proposed the new NAND flash memory package for overcoming this major drawback. We present a high performance and low power NAND flash memory system with a dual cache memory. The proposed NAND flash package consists of two parts, i.e., an NAND flash memory module, and a dual cache module. The new NAND flash memory system can achieve dramatically higher performance and lower power consumption compared with any conventionM NAND-type flash memory module. Our results show that the proposed system can reduce about 78% of write operations into the flash memory cell and about 70% of read operations from the flash memory cell by using only additional 3KB cache space. This value represents high potential to achieve low power consumption and high performance gain.

关键词： flash memory NAND-type NOR-type memory localities buffer or cache memory

Single-step Preparation of Nano-homogeneous NiO/YSZ Composite Anode for Solid Oxide Fuel Cells

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Nano-Micro Letters 2013年第2期5卷 111-116页

作者： jung-hoon Song Mi Young Park Hye won Park Hyung-Tae Lim Research Institute of Industrial Science and Technology (RIST) Fuel Cell Project Changwon National University School of Nano & Advanced Materials Engineering

Homogeneous co-precipitation and hydrothermal treatment were used to prepare nano- and highly dispersed Ni O/YSZ(yttria-stabilized zirconia) composite powders. Composite powders of size less than 100 nm were successfully prepared. This process did not require separate sintering of the YSZ and Ni O to be used as the raw materials for solid oxide fuel cells. The performance of a cell fabricated using the new powders(*** density ~0.87 W/cm^2) was higher than that of a cell fabricated using conventional powders(max. power density ~0.73 W/cm^2). Co-precipitation and hydrothermal treatment proved to be very effective processes for reducing cell production costs as well as improving cell performance.

关键词： Fuel cells Powder processing Electrochemistry Hydrothermal process NiO/YSZ composite anode

Extracorporeal shock wave therapy treatment of painful hematoma in the calf:A case report

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World Journal of Clinical Cases 2020年第24期8卷 6511-6516页

作者： Ji won jung Hyeon Seong Kim jung Ho Yang Kyu hoon Lee Si-Bog Park Department of Rehabilitation Medicine Hanyang University HospitalSeoul 04763South Korea

BACKGROUND Extracorporeal shock wave therapy (ESWT) can be applied to variousmusculoskeletal conditions including calcific tendinitis. Muscle injuries can leadto hematomas, and unabsorbed hematomas sometimes cause pain. We report acase of painful hematoma successfully treated with ESWT. To our knowledge, thisis the first reported case of painful intramuscular hematoma treated with *** SUMMARY A 65-year-old man visited the outpatient department for left calf pain withswelling that had persisted since he slipped two weeks prior. The calf pain hadpersisted and was rated visual analog scale 7. On physical examination, there wasa localized, stiff, ovoid mass on his left upper posterior calf. The pain wasaggravated by dorsiflexion of the left ankle or weight-bearing on the left *** diagnostic ultrasonography showed a hematoma in the left gastrocnemiusmuscle;its texture was firm with low heterogeneity. We applied ESWT to thehematoma. His pain decreased immediately to a visual analog scale 3, and themass was softened. The texture of the hematoma became more heterogeneous onultrasonography. Due to planned overseas travel, he returned three months afterthe initial visit to report that the pain and swelling were dramatically relievedafter *** We propose that painful hematomas could be a new indication for ESWT. Furtherinvestigation on the effects of ESWT for hematomas is needed.

关键词： Extracorporeal shock wave therapy Hematoma Ultrasonography Indication Pain Case report

Influences of ions and temperature on performance of carbon nano-particulates in supercapacitors with neutral aqueous electrolytes

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Particuology 2014年第4期12卷 9-17页

作者： jung hoon Chae George Zheng Chen Department of Chemical and Environmental Engineering and Energy and Sustainability Research DivisionFaculty of EngineeringUniversity of NottinghamNottinghamNG7 2RDUK

A commercial product of carbon nano-particles, Cabot MONACH 1300 pigment black （CMPB）, was studied for basic structural information and electrochemical performance in neutral aqueous electrolytes, aiming at applications in supercapacitors. As confirmed by SEM and HRTEM, the CMPB had a hierarchical struc- ture, containing basic 10 nm nano-spheres which combined into ca. 50 nm agglomerates which further aggregated into larger particles of micrometres. The capacitance of this commercial material was found to increase with decreasing the size of hydrous cation （Li＋→Na＋ → K＋）, instead of the cation crystal radius （K＋→ Na＋→Li＋） when coupled with the same anion （cl-）. In electrolytes with the same cation concentration （K＋）, changing the anion from the larger dianion （SO42 ） to the smaller monoanion （cl-） also increased the capacitance at high potential scan rates （〉50 mV/s）. Increasing electrolyte concentration produced expected effect, including raising the electrode capacitance, but lowering the equivalent series resistance （ESR）, charge transfer resistance （CTR）, and the diffusion resistance. At higher temperatures, the CMPB exhibited slightly higher capacitance, which does not agree with the Gouy-Chapman theory on electric double layer （EDL）. A hypothesis is proposed to account for the capacitance increase with temperature as a result of the CMPB opening up some micro-pores for more ions to access in response to the temperature increase.

关键词： Carbon nano-particlesSupercapacitorNeutral aqueous electrolytesIonic propertiesElectrochemistry

Dynamic Changes in Left and Right Cerebral Oxygen Saturation during Selective Cerebral Perfusion in Young Infants

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Congenital Heart Disease 2023年第6期18卷 639-647页

作者： Hwa-Young Jang Sang-Jun Beon Sung-hoon Kim In-Kyung Song won-jung Shin Department of Anesthesiology and Pain Medicine Laboratory for Cardiovascular DynamicsAsan Medical CenterUniversity of Ulsan College of MedicineSeoul05505Korea Department of Physician Education and Training Asan Medical CenterSeoul05505Korea

Objectives:We investigated whether the selective cerebral perfusion(SCP)technique causes differences in changes in cerebral perfusion between both hemispheres in young infants,using cerebral oxygen saturation(ScO2)as an ***,we determined the association between the discrepancy in ScO2 and cerebral perfu-sion pressure during ***:The difference in ScO2 between the left and right cerebral hemispheres(ΔScO2 Rt-Lt)was calculated during clamping of the innominate artery(IA)and during ***:In 25 infants(aged 2 to 78 days),the left and right ScO2 were well maintained(median 63.2%and 60.9%during IA clamping,respectively;64.0%and 65.6%during SCP,respectively).During IA clamping,right and left ScO2 decreased(med-ian-1.4%and-1.0%,respectively).During SCP,rightΔScO2 was higher compared to leftΔScO2(median 1.5%vs.0.6%;p<0.001).Eight patients had a higher rightΔScO2 than leftΔScO2 throughout *** had lowerΔScO2 Rt-Lt during IA clamping(median-3.2%vs.0.0%;p<0.001)and higherΔScO2 Rt-Lt during SCP than others(median 5.0%vs.-0.8%;p<0.001).During and after SCP,the correlation coefﬁcient between rightΔScO2 and change in the mean arterial pressure was higher in patients with a discrepancy than in others(r=0.731 vs.r=0.519;p<0.001).Conclusions:This study suggests that SCP permits adequate bilateral cerebral ***,the unilateral cerebral perfusion technique may cause a difference in cerebral perfusion between both hemispheres in young infants;this may depend on the perfusion pressure.

关键词： Cerebral circulation congenital heart defects monitoring near-infrared spectroscopy

Arthroscopic treatment of iliopsoas tendinitis after total hip arthroplasty with acetabular cup malposition: Two case reports

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World Journal of Clinical Cases 2020年第21期8卷 5326-5333页

作者： Heejae won Kwang-Hwan Kim Jae-Wook jung Shin-Yoon Kim Seung-hoon Baek Department of Orthopedic Surgery School of MedicineKyungpook National UniversityKyungpook National University Hospital130 Dongdeok-roJung-GuDaegu 41944South Korea

BACKGROUND Optimal treatment for iliopsoas tendinitis after total hip arthroplasty(THA)with cup malposition,iliopsoas release alone or with cup revision,is controversial,particularly in young,active ***,arthroscopic iliopsoas tendon(IPT)release in these patients has been rarely described,and midterm effects of this procedure on THA longevity and groin pain recurrence remain *** performed arthroscopic IPT release after THA and report midterm outcomes in two young patients with acetabular cup *** SUMMARY In the two patients,groin pain started early after *** examination revealed nonspecific findings,and laboratory tests showed no evidence of *** and computed tomography showed reduced acetabular component anteversion angle and anterior cup prominence of more than 16 *** therapeutic diagnosis,ultrasonography-guided lidocaine with steroid was injected into the IPT *** both patients,groin pain improved initially but worsened after a few ***,the patients underwent arthroscopic IPT release under spinal *** revealed synovitis with fibrous tissues around the IPT and various lesions related to the implants after *** tenotomy and debridement with biopsy were performed;histopathologic studies showed chronic inflammation with synovial *** patients were encouraged to start walking immediately after surgery,and they returned to complete daily function early after *** experienced no recurrence of groin pain or any implant-related problems 5 years *** Arthroscopic IPT release for cup malposition produced excellent midterm outcomes without recurrence of groin pain and implant-related problems.

关键词： Iliopsoas tendinitis Total hip arthroplasty Cup malposition Arthroscopy Tenotomy Case report

Complete recovery of herpes zoster radiculopathy based on electrodiagnostic study:A case report

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World Journal of Clinical Cases 2021年第17期9卷 4303-4309页

作者： Hyeon Seong Kim Ji won jung You Jin jung Young Suck Ro Si-Bog Park Kyu hoon Lee Department of Rehabilitation Medicine Hanyang University HospitalSeoul 04763South Korea Department of Dermatology Hanyang University HospitalSeoul 04763South Korea

BACKGROUND Herpes zoster is a painful infectious disease caused by the varicella zoster *** zoster radiculopathy,which is a type of segmental zoster paresis,can complicate the disease and cause motor *** complication should be considered when a patient with a rash complains of acute-onset motor weakness,and the diagnosis can be verified via electrodiagnostic *** SUMMARY A 64-year-old female with a history of asthma presented to the emergency department with stabbing pain,an itching sensation,and a rash on the right anterior shoulder that had begun 5 d *** examination revealed multiple erythematous grouped vesicles in the right C4-5 and T1 dermatome *** herpes zoster was suspected,the patient immediately received intravenous *** the third hospital day,she complained of motor weakness in the right upper *** resonance imaging of the cervical spine revealed mild intervertebral disc herniation at C4-C5 without evidence of nerve root *** the 12th hospital day,electrodiagnostic study revealed right cervical radiculopathy,mainly in the C5/6 *** months later,monoparesis resolved,and follow-up electrodiagnostic study was *** This case emphasizes that clinicians should consider the possibility of postherpetic paresis,such as herpes zoster radiculopathy,and that electrodiagnostic study is useful for diagnosis and follow-up.

关键词： Herpes zoster Radiculopathy Electrodiagnosis Varicella zoster virus Monoparesis Case report