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Plasma Science and Technology 2021年第5期23卷 96-103页

作者： Seul-ki HAN Se-Hwan PARK Seong-Kyu AHN Korea Atomic Energy Research Institute Yuseong-guDaejeon 34057Republic of Korea Korea Institute of Industrial Technology Yeonsu-guIncheon21999Republic of Korea

The amounts of nuclear materials in the Li Cl-KCl salt in pyroprocessing have to be analyzed to prevent the diversion of the nuclear *** alternative method to the chemical analysis has been pursued,and laser-induced breakdown spectroscopy(LIBS)is one *** the present work,an in situ and quantitative analysis method of electro-recovery(ER)salt was proposed and demonstrated by using LIBS combined with dipstick *** types of simulated salt samples were prepared:ER salt sample and salt obtained from the dipstick sampling,and pulsed neodymium-doped yttrium aluminum garnet(Nd:YAG)laser with a wavelength of 532 nm was focused on the salt to generate *** plasma emission was measured by using an Echelle spectrometer with a resolution of 0.01 nm in conjunction with an Intensified Charge-Coupled Detector *** U and other rare earth peaks in the spectra were *** best Limit of Detection and Root Mean Square Error of Calibration of U were 38 ppm and 0.0203 wt%,*** work shows that the U in the pyroprocessing ER salt can be monitored with LIBS.

关键词： LIBS uranium LOD RMSEC

Breaking the resolution-bandwidth limit of chip-scale spectrometry by harnessing a dispersion-engineered photonic molecule

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Light(Science & Applications) 2023年第3期12卷 475-488页

作者： Hongnan Xu Yue Qin Gaolei Hu Hon ki Tsang Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

The chip-scale integration of optical spectrometers may offer new opportunities for in situ bio-chemical analysis,remote sensing,and intelligent health *** miniaturization of integrated spectrometers faces the challenge of an inherent trade-off between spectral resolutions and working ***,a high resolution requires long optical paths,which in turn reduces the free-spectral range(FSR).In this paper,we propose and demonstrate a ground-breaking spectrometer design beyond the resolution-bandwidth *** tailor the dispersion of mode splitting in a photonic molecule to identify the spectral information at different *** tuning over a single FSR,each wavelength channel is encoded with a unique scanning trace,which enables the decorrelation over the whole bandwidth spanning multiple *** analysis reveals that each left singular vector of the transmission matrix is mapped to a unique frequency component of the recorded output signal with a high sideband suppression ***,unknown input spectra can be retrieved by solving a linear inverse problem with iterative *** results demonstrate that this approach can resolve any arbitrary spectra with discrete,continuous,or hybrid *** ultrahigh resolution of100 nm far exceeding the narrow *** ultralarge wavelength-channel capacity of 2501 is supported by a single spatial channel within an ultrasmall footprint(≈60×60μm^(2)),which represents,to the best of our knowledge,the highest channel-to-footprint ratio(≈0.69μm^(−2))and spectral-to-spatial ratio(>2501)ever demonstrated to date.

关键词： resolution dispersion limit

Repair of a large patellar cartilage defect using human umbilical cord blood-derived mesenchymal stem cells:A case report

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World Journal of Clinical Cases 2022年第34期10卷 12665-12670页

作者： Jun-Seob Song ki-Taek Hong ki Jeon Song Seok Jung kim Department of Orthopedic Surgery Gangnam JS HospitalSeoul 06053South Korea Department of Orthopedic Surgery Uijeongbu Street Mary’s HospitalCollege of MedicineThe Catholic University of KoreaUijeongbu 11765GyeonggidoSouth Korea

BACKGROUND Patellar dislocation may cause cartilage defects of various *** defects commonly require surgical treatment;however,conventional treatments are *** SUMMARY A 15-year-old male with a large patellar cartilage defect due to patellar dislocation was treated via human umbilical cord blood-derived mesenchymal stem cell(hUCB-MSC)*** our knowledge,this is the first report of this treatment for this *** patient recovered well as indicated by good visual analog scale,International Knee Documentation Committee and McMaster Universities Osteoarthritis Index *** resonance imaging showed cartilage regeneration 18 mo *** Umbilical cord blood-derived hUCB-MSCs may be a useful treatment option for the repair of large patellar cartilage defects.

关键词： Cartilage defect Umbilical cord Mesenchymal stem cells Patellar dislocation Magnetic resonance imaging Case report

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World Journal of Clinical Cases 2021年第24期9卷 7205-7211页

作者： So-My Koo ki-Up kim Yang-ki kim Soo-Taek Uh Department of Internal Medicine Soonchunhyang University Seoul HospitalSeoul 04401South Korea

BACKGROUND Epidermal growth factor receptor tyrosine kinase inhibitors(EGFR-Tkis)are tolerable drugs used for patients with EGFR-mutant advanced non-small cell lung cancer(NSCLC).Serious adverse reactions are uncommon compared with cytotoxic *** SUMMARY A 52-year-old man presented with general weakness and *** had been taking erlotinib for 11 mo to treat *** pathological diagnosis from the right upper lobe mass was adenocarcinoma with an EGFR mutation in exon 21(L858R).He had previously received paclitaxel/carboplatin,gemcitabin/vinorelbine chemotherapy,stereotactic radiosurgery for brain metastasis,and whole-brain radiotherapy as treatment for *** diagnosed the patient with acute myeloid leukemia(AML).During the induction and consolidation chemotherapy for AML,the erlotinib was *** complete remission of the AML was achieved,since the lung masses were increased,pemetrexed/cisplatin for the NSCLC was *** two cycles of chemotherapy,the cytopenia was *** relapse occurred with the same *** Therapy-related acute myeloid neoplasm(t-MN)is a rare but fatal late *** a patient may be taking EGFR-Tkis,the possibility of t-MN should be *** studies are needed to determine whether EGFR-Tki usage is a predisposing factor for t-MN.

关键词： Acute myeloid leukemia Erlotinib Neoplasm,second primary Non-small cell lung cancer Case report

Uranium measurements using laser-induced breakdown spectroscopy in lithium chloride-potassium chloride salt of pyroprocessing

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Plasma Science and Technology 2020年第7期22卷 110-115页

作者： Seul-ki HAN Se-Hwan PARK Seong-Kyu AHN Korea Atomic Energy Research Institute Yuseong-guDaejeon 34057Republic of Korea

In pyroprocessing,uranium(U) is recovered from molten LiCl-KCl salt,and,for safeguard purposes,it is important to analyze the U and Plutonium(Pu) concentrations in a timely *** the present work,salt samples containing U were *** laser used in the present work was an Nd:YAG laser with a wavelength of 532 nm,a laser energy on the sample of11.5 mJ,and a pulse repetition rate of 10 *** plasma emission light was measured with an Echelle spectrometer.A total of 100 points on the sample surface were measured as the laser incident position was *** U and potassium(K) peaks in the spectrum were *** and multivariate analyzes were conducted to determine the accuracy and limit of detection(LOD) of the laser-induced breakdown spectroscopy.

关键词： LIBS uranium(U) safeguards LOD

Million-Q integrated Fabry-Perot cavity using ultralow-loss multimode retroreflectors

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Photonics Research 2022年第11期10卷 2549-2559页

作者： HONGNAN XU YUE QIN GAOLEI HU HON ki TSANG Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong KongChina

The monolithic integration of Fabry-Perot cavities has many applications,such as label-free sensing,high-finesse filters,semiconductor lasers,and frequency comb ***,the excess loss of integrated reflectors makes it challenging to realize integrated Fabry-Perot cavities working in the ultrahigh-Q regime(>10^(6)).Here,we propose and experimentally demonstrate what we believe is the first silicon integrated million-Q Fabry-Perot *** by free-space optics,a novel monolithically integrated retroreflector is utilized to obtain near-unity reflectance and negligible reflection *** corner scattering in the retroreflector is prevented by the use of the TE_(1) mode,taking advantage of its zero central field *** incurred by other mechanisms are also meticulously *** measurement results show resonances with an ultrahigh intrinsic Q factor of≈3.4×10^(6)spanning an 80-nm *** measured loaded Q factor is≈2.1×10^(6).Ultralow reflection losses(≈0.05 dB)and propagation losses(≈0.18 dB/cm)are experimentally realized.

关键词： scattering cavity optics

Enhancement of mechanical and tribological performance of Ti-6Al-4V alloy by laser surface alloying with Inconel 625 and SiC precursor materials

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Friction 2024年第9期12卷 2089-2107页

作者： Hao-Ran CHENG ki-Hoon SHIN Hong Seok kiM Department of Mechanical Engineering Graduate School of Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of Mechanical and Automotive Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

This study focused on producing metal matrix composite(MMC)coatings on Ti–6Al–4V alloy through laser surface alloying using a novel combination of Inconel 625 and SiC precursor *** ratios of alloying powders were examined to evaluate surface properties such as microhardness,wear resistance,and friction coefficient,along with analyzing the phase composition and microstructure of the *** in situ synthesized MMC coatings exhibited the presence ofα-Ti,NiTi,NiTi_(2),and TiC ***,Ti_(5)Si_(3)andα-Ti/Ti_(5)Si_(3)eutectic structures were observed when the SiC content exceeded 20%.In comparison to the titanium substrate,the MMC coating significantly enhanced microhardness by over threefold and reduced wear by 95%.However,it was crucial to carefully select the appropriate combination of alloying powders to avoid a substantial decrease in friction performance and excessive formation of *** a comparative analysis of experimental results,the optimal precursor material composition was identified as 85%Inconel 625 and 15%*** study demonstrated the effective utilization of Inconel 625 and SiC alloying materials to enhance the surface properties of titanium alloys,thereby expanding their application in challenging environments.

关键词： titanium alloy Inconel 625 SiC ceramic laser surface alloying metal matrix composite(MMC)

Recent developments of emerging inorganic, metal and carbon- based nanomaterials for pressure sensors and their healthcare monitoring applications

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Nano Research 2021年第9期14卷 3096-3111页

作者： Kyowon Kang Jaejin Park kiho kim ki Jun Yu School of Electrical and Electronic Engineering YU-KIST InstituteYonsei UniversitySeoul 03722Republic of Korea

Recently,flexible pressure sensors have gained substantial research interest in bioelectronics because they can monitor the conditions of various organs,enable early diagnosis of diseases,and provide precise medical treatment by applying them to various parts of the *** particular,inorganic materials,metal and carbon-based materials are broadly used in novel structured pressure sensors from wearable devices to implantable *** the excellent electronic properties,distinctive morphologies,and remarkable mechanical and chemical stability of these materials,it is expected that these flexible pressure sensors can be the basis for new methods for human *** article covers an extensive review of the inorganic,metal and carbon-based flexible pressure sensor design strategies and sensing mechanisms studied in recent years for diverse applications such as tactile sensors,arterial pulse sensors,intracranial pressure sensors,intraocular pressure sensors,and bladder pressure *** section provides an overview by introducing the recent progress in flexible pressure sensors.

关键词： nanomaterial inorganic carbon pressure sensor wearable device implantable device

Adaptive Memory Event-Triggered Observer-Based Control for Nonlinear Multi-Agent Systems Under DoS Attacks

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IEEE/CAA Journal of Automatica Sinica 2021年第10期8卷 1644-1656页

作者： Xianggui Guo Dongyu Zhang Jianliang Wang Choon ki Ahn School of Beijing Engineering Research Center of Industrial Spectrum Imaging School of Automation and Electrical EngineeringUniversity of Science and Technology BeijingBeijing 100083 Shunde Graduate School of University of Science and Technology Beijing Foshan 528000China Autonomous Intelligent Systems Department Hangzhou Innovation Institute of Beihang UniversityHangzhou 310051China School of Electrical Engineering Korea UniversitySeoul 1360701Korea

This paper investigates the event-triggered security consensus problem for nonlinear multi-agent systems(MASs)under denial-of-service(Do S)attacks over an undirected graph.A novel adaptive memory observer-based anti-disturbance control scheme is presented to improve the observer accuracy by adding a buffer for the system output ***,this control scheme can also provide more reasonable control signals when Do S attacks *** save network resources,an adaptive memory event-triggered mechanism(AMETM)is also proposed and Zeno behavior is *** is worth mentioning that the AMETM's updates do not require global ***,the observer and controller gains are obtained by using the linear matrix inequality(LMI)***,simulation examples show the effectiveness of the proposed control scheme.

关键词： Adaptive memory event-triggered mechanism(AMETM) compensation mechanism denial-of-service(DoS)attacks nonlinear multi-agent systems(MASs) observer-based anti-disturbance control

Circadian fluctuations in three types of sensory modules in healthy subjects

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Neural Regeneration Research 2014年第4期9卷 436-439页

作者： Yong Hyun Kwon ki Seok Nam Department of Physical Therapy Yeungnam University College of Science and TechnologyHyunchung-roNam-guDaeguRepublic of Korea

This study was designed to observe and compare the circadian fluctuations in tactile sense, joint reposition sense and two-point discrimination in healthy subjects. Twenty-one healthy adult subjects received perceptual ability tests through these three different sensory modules at approximately 9：00, 13：00 and 18：00 in a day. The distribution of ranking for perceptual ability was significantly different among the three different time points in each individual, with highest perceptual ability in the evening compared with noon and morning, in terms of tactile sense and two-point discrimination. These findings suggest that the perceptual ability of healthy subjects fluctuates according to the time points in a day.

关键词： nerve regeneration circadian pattern biological rhythm circadian fluctuations perceptual ability tactile sensory joint reposition sense two-point discrimination Basic Science ResearchProgram through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology neural regeneration