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Neural Regeneration Research 2024年第11期19卷 2351-2353页

作者： Samuel K.H.Sy Ho ko Division of Neurology Department of Medicine and TherapeuticsFaculty of MedicineThe Chinese University of Hong KongShatinNew TerritoriesHong Kong Special Administrative RegionChina Li Ka Shing Institute of Health Sciences Faculty of MedicineThe Chinese University of Hong KongShatinNew TerritoriesHong Kong Special Administrative RegionChina Department of Electrical and Electronic Engineering Faculty of EngineeringThe University of Hong KongPok Fu LamHong Kong IslandHong Kong Special Administrative RegionChina Advanced Biomedical Instrumentation Center Hong Kong Science ParkPak Shek KokNew TerritoriesHong Kong Special Administrative RegionChina Margaret K.L.Cheung Research Center for Management of Parkinsonism Faculty of MedicineThe Chinese University of Hong KongShatinNew TerritoriesHong Kong Special Administrative RegionChina Lau Tat-chuen Research Center of Brain Degenerative Diseases in Chinese Faculty of MedicineThe Chinese University of Hong KongShatinNew TerritoriesHong Kong Special Administrative RegionChina Gerald Choa Neuroscience Institute The Chinese University of Hong KongShatinNew TerritoriesHong Kong Special Administrative RegionChina

Precise chemical cue presentation alongside advanced brainwide imaging techniques is important to the study of chemosensory processing in ***,the dynamic nature of chemical-carrying media,such as water or air,poses a significant challenge for delivering highly-controlled chemical flow to an animal ***,contact-based cue manipulation and delivery easily shift the position of the animal subject,which is often undesirable for high-quality brain ***,more advanced interfacing tools that align with the diverse range of body part sizes of an animal,ranging from micrometer-scale neurons to meter-long limbs,are much *** is particularly crucial when dealing with dimensions that are beyond the reach of conventional experimental tools.

关键词： dealing precise sizes

Programmable directional color dynamics using plasmonics

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Microsystems & Nanoengineering 2024年第1期10卷 325-334页

作者： Gyurin Kim Doeun Kim Soeun ko Jang-Hwan Han Juhwan Kim Joo Hwan ko Young Min Song Hyeon-Ho Jeong School of Electrical Engineering and Computer Science Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Semiconductor Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Artificial Intelligence(AI)Graduate School Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea

Adaptive multicolor filters have emerged as key components for ensuring color accuracy and resolution in outdoor visual ***,the current state of this technology is still in its infancy and largely reliant on liquid crystal devices that require high voltage and bulky structural ***,we present a multicolor nanofilter consisting of multilayered‘active’plasmonic nanocomposites,wherein metallic nanoparticles are embedded within a conductive polymer *** nanocomposites are fabricated with a total thickness below 100 nm using a‘lithography-free’method at the wafer level,and they inherently exhibit three prominent optical modes,accompanying scattering phenomena that produce distinct dichroic reflection and transmission ***,a pivotal achievement is that all these colors are electrically manipulated with an applied external voltage of less than 1 V with 3.5 s of switching speed,encompassing the entire visible ***,this electrically programmable multicolor function enables the effective and dynamic modulation of the color temperature of white light across the warm-to-cool spectrum(3250 K-6250 K).This transformative capability is exceptionally valuable for enhancing the performance of outdoor optical devices that are independent of factors such as the sun’s elevation and prevailing weather conditions.

关键词： directional prevailing exceptional

Advances in wearable and implantable bioelectronics for precision medicine

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Bio-Design and Manufacturing 2024年第4期7卷 383-387页

作者： Kaichen Xu Seung Hwan ko Jun Chen State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310058China Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National UniversitySeoul 08826Republic of Korea Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095-1599USA

The continuous pursuit for a better quality of life promotes continuous advancements in intelligent *** wearable and implantable bioelectronics have emerged as an innovative complement to rigid material-based electronic devices[1-3].Due to their distinct advantages in terms of ductile,ultrathin,and biocompatible features,these elastic and soft bioelectronic devices can be seamlessly mounted onto various real or artificial tissues and organs.

关键词： wear mounted pursuit

Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes

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Chemical Research in Chinese Universities 2024年第3期40卷 556-560页

作者： Pui Kei ko Jonathan E.HALPERT Department of Chemistry The Hong Kong University of Science and TechnologyKowloonHong Kong 999077P.R.China

The halide migration effect in mixed-halide lead-based perovskite is a serious problem hindering the development of its display *** this study,we have successfully addressed this issue by reporting formadinium(FA)doped mixed-halide perovskite nanocrystals(NCs)with ultra-deep-blue emission of 450 nm,narrow bandwidth of 16 nm,and a high photoluminescence quantum yield(PLQY)of 66%.The perovskite nanocrystal light-emitting diodes(NC-LEDs)using this nanocrystal as an active layer achieved a maximum external quantum efficiency(EQE)of 0.32%,30-fold improved compared to that of pristine and stable electroluminescence(EL)spectra at 450 nm under a 4.9–8.0 V *** findings demonstrate the potential of our approach in developing stable and efficient deep blue perovskite NC-LEDs.

关键词： Halide perovskite Light-emitting diode Deep-blue

Fabrication of branch-like Aph@LDH-MgO material through organic-inorganic hybrid conjugation for excellent anti-corrosion performance

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Journal of Magnesium and Alloys 2023年第7期11卷 2469-2485页

作者： Maryam Chafiq Abdelkarim Chaouiki Rachid Salghi Young Gun ko Materials Electrochemistry Laboratory School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea Laboratory of Applied Chemistry and Environment ENSAUniversity Ibn ZohrPO Box 1136Agadir80000Morocco

Layered double hydroxides(LDH)frameworks have shown significant enhancement in stability and reusability,and their tailorable architecture brings new insight into the development of the next generation of hybrid materials,which attracted considerable attention in many fields over the *** of the factors contributing to the widespread applicability of layered double hydroxides is their adaptable composition,which can accommodate a wide spectrum of potential anionic *** exceptional property makes the LDH system simple to adjust for various ***,most LDH systems are synthesized in situ in an autoclave at high temperatures and pressures that severely restrict the industrial use of such coating *** this study,LDH was directly synthesized on a magnesium alloy that had undergone plasma electrolytic oxidation(PEO)treatment in the presence of ethylenediaminetetraacetic acid,thereby avoiding the use of hydrothermal autoclave *** LDH system was compared with a hybrid architecture consisting of organic-inorganic *** organic layer was fabricated on top of the LDH film using 4-Aminophenol(Aph)compound,resulting in a smart hierarchical structure that can provide a robust Aph@LDH film with excellent anti-corrosion *** the molecular level,the conjugation characteristics and adsorption mechanism of Aph molecule were studied using two levels of theory as ***,Localized orbit locator(LOL)-πisosurface,electrostatic potential(ESP)distribution,and average local ionization energy(ALIE)on the molecular surface were used to highlight localization region,reveal the favorable electrophilic and nucleophilic attacks,and clearly explore the type of interactions that occurred around interesting ***,first-principles based on density functional theory(DFT)was applied to study the hybrid mechanism of Aph on LDH system and elucidate their mutual *** experimental and computational analyses suggest t

关键词： Magnesium alloy Surface modification LDH Organic-inorganic hybrid materials Inter-/intra-molecular interactions

Influences of Pr and Ta doping concentration on the characteristic features of FTO thin film deposited by spray pyrolysis

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Chinese Physics B 2015年第10期24卷 414-422页

作者： Güven Turgut Adem koqyigit Erdal Snmez Erzurum Technical University Science FacultyDepartment of Basic Sciences Igdir University Engineering FacultyDepartment of Electrical Electronic Engineering Ataturk University Kazim Karabekir Education FacultyDepartment of Physics

The Pr and Ta separately doped FTO（10 at.% F incorporated Sn O2） films are fabricated via spray pyrolysis. The microstructural, topographic, optical, and electrical features of fluorine-doped TO（FTO） films are investigated as functions of Pr and Ta dopant concentrations. The x-ray diffraction（XRD） measurements reveal that all deposited films show polycrystalline tin oxide crystal property. FTO film has（200） preferential orientation, but this orientation changes to（211） direction with Pr and Ta doping ratio increasing. Atomic force microscopy（AFM） and scanning electron microscopy（SEM） analyses show that all films have uniform and homogenous nanoparticle distributions. Furthermore, morphologies of the films depend on the ratio between Pr and Ta dopants. From ultraviolet-visible（UV-Vis） spectrophotometer measurements, it is shown that the transmittance value of FTO film decreases with Pr and Ta doping elements increasing. The band gap value of FTO film increases only at 1 at.% Ta doping level, it drops off with Pr and Ta doping ratio increasing at other doped FTO films. The electrical measurements indicate that the sheet resistance value of FTO film initially decreases with Pr and Ta doping ratio decreasing and then it increases with Pr and Ta doping ratio increasing. The highest value of figure of merit is obtained for 1 at.% Ta- and Pr-doped FTO film. These results suggest that Pr- and Ta-doped FTO films may be appealing candidates for TCO applications.

关键词： Pr-doped FTO Ta-doped FTO spray pyrolysis tin oxide thin films double doping

Cutting force signal pattern recognition using hybrid neural network in end milling

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中国有色金属学会会刊：英文版 2009年第B09期19卷 209-214页

作者： Song-Tae SEONG ko-Tae JO Young-Moon LEE Research and Development Department Gyeongbuk Hybrid Technology Institute School of Mechanical Engineering Yeongnam University School of Mechanical Engineering Kyungpo ok National University

Under certain cutting conditions in end milling, the signs of cutting forces change from positive to negative during a revolution of the tool. The change of force direction causes the cutting dynamics to be unstable which results in chatter vibration. Therefore, cutting force signal monitoring and classification are needed to determine the optimal cutting conditions and to improve the efficiency of cut. Artificial neural networks are powerful tools for solving highly complex and nonlinear problems. It can be divided into supervised and unsupervised learning machines based on the availability of a teacher. Hybrid neural network was introduced with both of functions of multilayer perceptron (MLP) trained with the back-propagation algorithm for monitoring and detecting abnormal state, and self organizing feature map (SOFM) for treating huge datum such as image processing and pattern recognition, for predicting and classifying cutting force signal patterns simultaneously. The validity of the results is verified with cutting experiments and simulation tests.

关键词：切削力信号混合神经网络模式识别铣床人工神经网络切削条件信号监测监督学习

Chemokine-mimetic plerixafor derivative for tumorspecific delivery of nanomaterials

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Nano Research 2018年第4期11卷 2159-2172页

作者： Seungbeom ko Gayong Shim Jinyoung Kim Yu-Kyoung Oh College of Pharmacy and Research Institute of Pharmaceutical Sciences Seoul National University 1 Kwanak-ro Kwanak-gu Seoul 08826 Republic of Korea

Here, we report that chemokine-mimetic plerixafor derivatives could govern tumor-specific delivery and functional effects of nanomaterials. Reduced graphene oxide （rGO） nanosheets were used as a model functional nanomaterial, and plerixafor-conjugated lipid （PL/rGO） or a benzylcyclam derivative of plerixafor- conjugated lipid （BPL/rGO） was physically adsorbed onto the surface of rGO. The cellular uptake of surface-modified rGO was dependent on overexpression of the CXCR4 chemokine receptor on cancer cells. In KB cells, the binding affinity of BPL/rGO for CXCR4 was 6.8-fold greater than that of PL/rGO. Notably, cellular uptake patterns correlated with in vitro photothermal anticancer efficacy. The tumor distribution of BPL/rGO was higher than that of PL/rGO and plain rGO in mice bearing CXCR4-overexpressing tumors, whereas the distribution of the various rGO forms was similar in mice harboring CXCR4-negative tumors. Moreover, complete photothermal tumor ablation was observed in BPL/rGO- treated mice bearing CXCR4-positive KB cell tumors, but not in CXCR4-negative MCF-7 cell tumors. These results provide evidence that BPL can be used to enhance the delivery of nanomaterials to CXCR4-overexpressing tumors. Chemokine-mimetic BPL can be further applied for nanomaterial-based delivery of photosensitizers, anticancer drugs, or diagnostic tumor imaging agents in CXCR4-overexpressing cancer patients.

关键词： chemokine-mimetic plerixafor derivatives chemokine receptor nanomaterial photothermal therapy

3D attitude measurement by means of spread spectrum modulated ultrasonic wave

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仪器仪表学报 2007年第4期28卷 590-596页

作者： Shinji Ohyama Hiroshi Iwasawa Sang Il ko Junya Takayama Graduate School of Science and Engineering Tokyo Institute of Technology2-12-1O-okayamaMeguro-ku Tokyo 152-8552Japan

Local position and attitude measurement methods are necessary for the navigation of autonomous robots and the other applications. In this paper, a 3D attitude measurement method is proposed. This method uses the spread spectrum modulated ultrasonic wave for the measurement of the pseudo-distance of each pathway between transmitter and receiver elements that are arranged in an array. The relative attitude between transmitter and receiver unit could be calculated from the relationship between these pseudo-distances. The use of spread spectrum modulation enables the high accuracy, noise tolerance, and coexistence of multiple transmitter devices by code division multiple access (CDMA) between transmitter and receiver elements. A pair of transmitter and receiver prototype for proposed method was manufactured, and the fundamental performance was examined in experiments. As a result, accuracy of σ=0.78 mm in the pseudo-distance measurement of each pathway between transmitter and receiver elements was confirmed, and about 0.01 rad resolution in the attitude measurement was also confirmed.

关键词：姿态测量准距离伸展光谱超声波