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Ultra-thin vertical tft photosensor and photosynapse based on au-doped-graphene under transition metal selenide reaction

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Journal of Materials Science & Technology 2024年第16期183卷 215-222页

作者： Ting Kang Adila Rani Wanqi Ren M Junaid Sultan nae-Eung Lee Tae Geun kim School of Electrical Engineering Korea UniversitySeoul 02841South Korea School of Advanced Materials Science&Engineering Sungkyunkwan UniversityGyeonggi-do 16419South Korea

The development of artificial photosensitive synapses with high sensitivity and biomimetic properties that combine innovative concepts and neuromorphic architectures is crucial to achieving highly integrated and flexible intelligent visual ***,graphene heterostructure-based photosensitive synaptic transistors have been extensively studied for this ***,compared to traditional transistors,vertical structure thin film transistors(VTFTs)with ultra-short channels and advantages,such as high integration,have yet to be investigated in photosensitive ***,we report an ultra-thin VTFT featuring a graphene/W_(x)Se_(x-1)van der Waals heterostructure that combines photonic and neuromorphic *** demonstrate a VTFT in which the channel layer is formed by covalently bonded W_(x)Se_(x-1)nanomaterials produced by introducing Se atoms on the surface of a tungsten metal thin film deposited via radio-frequency *** structure successfully simulated the main synaptic function,exhib-ited photosensitive synaptic responses to ultraviolet(λ=365 nm)light,and demonstrated highly reliable electrical ***,the incorporation of gold nanoparticles changed the photosensitive synaptic response properties of the graphene/W_(x)Se_(x-1)heterostructure from excitatory to inhibitory,show-ing a responsivity of about∼14 A W-1,which was attributed to the heterojunction interface resonant effects and efficient charge transfer induced by localized surface *** further enabled optical artificial synaptic applications while operating with low voltage spikes and low light *** work provides a novel strategy for integrating and developing biological and nano-electronic systems.

关键词： Ultra-thin Vertical TFT Au nanoparticles Photo sensor Photo responsivity Photo synapse

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Development of a Powder Extruder System for Dual-pore Tissue-engineering Scaffold Fabrication

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Journal of Bionic Engineering 2019年第4期16卷 686-695页

作者： nae-Un Kang Myoung Wha Hong Young Yul kim Young-Sam Cho Seung-Jae Lee Department of Mechanical Design Engineering College of EngineeringWonkwang University460 Iksandae-roIks an Jeonbuk570-749Republic of Korea Department of Orthopedics Daejeon StMary's HospitalCatholic University of Korea64Daeheung-i Jung-guDaejeon301-723Republic of Korea

In this study,we developed a powder extruder system that can extrude and deposit powder mixtures to overcome the reported limitations of conventional dualpore scaffold manufacturing *** evaluate the extrusion and deposition capability of the powder extruder system,3D tissue-engineering scaffolds with dual-pore characteristics were fabricated with a PCL/PEO/NaCl(polycaprolactone/polyethylene oxide/sodium chloride)powder *** addition,to evaluate the fabricated scaffolds,their compressive modulus,morphology,and in-vitro cell activity were ***,it was confirmed that the proposed powder extruder system can fabricate dual-pore scaffolds with well-interconnected pores as well as arbitrary 3D shapes shown by the fabrication of a 3D femur-shape scaffold similar to the femur *** results of the cell proliferation and Cell Counting Kit-8(CCK-8)assays,DNA content analysis and viability assays confirm that the dual-pore scaffold fabricated by the powder extruder system improves cell attachment,proliferation,and viability.

关键词： dual-pore scaffold powder extruder system polycaprolactone 3D tissue-engineering scaffold

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Analytic design of information granulation-based fuzzy radial basis function neural networks with the aid of multiobjective particle swarm optimization

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International Journal of Intelligent Computing and Cybernetics 2012年第1期5卷 4-35页

作者： Byoung-Jun Park Jeoung-nae Choi Wook-Dong kim Sung-Kwun Oh IT Convergence Technology Research Laboratory Electronics and Telecommunications Research Institute(ETRI)DaejeonSouth Korea Research Institute KDT Co.LtdBucheong-siSouth Korea Department of Electrical Engineering The University of SuwonHwaseong-siSouth Korea

Purpose–The purpose of this paper is to consider the concept of Fuzzy Radial Basis Function Neural Networks with Information Granulation(IG-FRBFNN)and their optimization realized by means of the Multiobjective Particle Swarm Optimization(MOPSO).Design/methodology/approach–In fuzzy modeling,complexity,interpretability(or simplicity)as well as accuracy of the obtained model are essential design *** the performance of the IG-RBFNN model is directly affected by some parameters,such as the fuzzification coefficient used in the FCM,the number of rules and the orders of the polynomials in the consequent parts of the rules,the authors carry out both structural as well as parametric optimization of the network.A multi-objective Particle Swarm Optimization using Crowding Distance(MOPSO-CD)as well as O/WLS learning-based optimization are exploited to carry out the structural and parametric optimization of the model,respectively,while the optimization is of multiobjective character as it is aimed at the simultaneous minimization of complexity and maximization of ***–The performance of the proposed model is illustrated with the aid of three *** proposed optimization method leads to an accurate and highly interpretable fuzzy ***/value–A MOPSO-CD as well as O/WLS learning-based optimization are exploited,respectively,to carry out the structural and parametric optimization of the *** a result,the proposed methodology is interesting for designing an accurate and highly interpretable fuzzy model.

关键词： Modelling Optimization techniques Neural nets Design calculations Fuzzy c-means clustering Multi-objective particle swarm optimization Information granulation-based fuzzy radial basis function neural network Ordinary least squaresmethod Weighted least square method

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Second to fourth digit ratio： a predictor of adult lung function

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Asian Journal of Andrology 2014年第1期16卷 140-145页

作者： I-nae Park Ho-Kee Yum Sang Chul Lee Jin Kyu Oh Tae Beom kim Department of Pulmonology Inje University Seoul Paik Hospital Seoul Korea Department of Urology Gachon University Gil Hospital Incheon Korea

Sex and sex hormones play a major role in lung physiology. It has been proposed that the ratio of the second to fourth digits （digit ratio） is correlated with fetal sex hormones. We therefore hypothesized that digit ratio might help predict lung function. We investigated the relationship between digit ratio and pulmonary function test （PFT） findings. A total of 245 South Korean patients （162 male, 83 female） aged from 34 to 90 years who were hospitalized for urological surgery were prospectively enrolled. Before administering the PFTs, the lengths of the second and fourth digits of the right hand were measured by a single investigator using a digital Vernier caliper. In males （n = 162）, univariate and multivariate analysis using linear regression models showed that digit ratio was a significant predictive factor of forced vital capacity （FVC） and forced expiratory volume in I second （FEV1）（FVC： r = 0.156, P = 0.047; FEVI： r = 0.160, P = 0.042）. In male ever-smokers （n = 69）, lung functions （FVC and FEV1） were correlated with smoking exposure rather than digit ratio. In female never-smokers （n = 83）, lung functions （FEV1 and FEVI/FVC ratio） were positively correlated with digit ratio on univariate analysis （FEVI： r = 0.242, P = 0.027; FEVI/FVC ratio： r = 0.245, P = 0.026）. Patients with lower digit ratios tend to have decreased lung function. These results suggest that digit ratio is a predictor of airway function.

关键词： airway function digit ratio sex hormone

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Delayed diagnosis of imperforate hymen with huge hematocolpometra:A case report

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World Journal of Clinical Cases 2021年第29期9卷 8901-8905页

作者： Eunbi Jang Kyeong A So Bomin kim A Jin Lee nae Ri kim Eun Jung Yang Seung-Hyuk shim Sun Joo Lee Tae Jin kim Department of Obstetrics and Gynecology Konkuk University School of MedicineSeoul 05030South Korea

BACKGROUND Imperforate hymen is a rare obstructive anomaly of the female reproductive *** is associated with complications,such as cyclical abdominal pain,urinary retention,and pelvic *** SUMMARY A 13-year-old girl presented several times to the emergency room with lower abdominal pain for a *** received conservative treatment,such as pain control,at each *** visited our gynecological clinic for worsening pain,and a 14-cm hematocolpos was found on *** was finally diagnosed with an imperforate hymen with *** was performed,which resulted in event-free regular cyclical *** Imperforate hymen should be considered in a premenarcheal adolescent girl with periodic abdominal pain.

关键词： Hematocolpos Imperforate hymen Abdominal pain Amenorrhea Case report

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A flexible magnetoelectric field-effect transistor with magnetically responsive nanohybrid gate dielectric layer

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Nano Research 2015年第10期8卷 3421-3429页

作者： Nguyen Minh Triet Tran Quang Trung Nguyen Thi Dieu Hien Saqib Siddiqui Do-ll kim Jai Chan Lee nae-Eung Lee SchoolofAdvancedMaterialsScienceandEngineering SungkyunkwanUniversitySuwonKyunggi-do440-746RepublicofKorea SungkyunkwanUniversity(SKKU)AdvancedInstituteofNanotechnology(SAINT) 5ungkyunkwanUniversitySuwonKyunggi-do440-746RepublicofKorea SamsungAdvancedInstituteforHealthSciencesandTechnology(SAIHST) SungkyunkwanUniversitySuwonKyunggi-do440-746RepublicofKorea

Flexible magnetoelectric （ME） materials have been studied for new applications such as memory, energy harvesters, and magnetic field sensors. Herein, with the widely studied and progressive advantages of ME phenomena in the multiferroic field, we demonstrate a new approach for utilizing flexible ME materials as gate dielectric layers in ME organic field-effect transistors （ME-OFET） that can be used for sensing a magnetic field and extracting the ME properties of the gate dielectric itself. The magnetoelectric nanohybrid gate dielectric layer comprises sandwiched stacks of magnetostrictive CoFe2O4 nanoparticles and a highly piezoelectric poly（vinylidene fluoride-co-trifluoroethylene） layer. While varying the magnetic field applied to the ME gate dielectric, the ME effect in the functional gate dielectric modulates the channel conductance of the ME-OFET owing to a change in the effective gate field. The clear separation of the ME responses in the gate dielectric layer of ME-OFET from those of the other parameters was demonstrated using the AC gate biasing method and enabled the extraction of the ME coefficient of ME materials. Additionally, the device shows high stability after cyclic bending of 10,000 cycles at a banding radius of 1.2 cm. The device has significant potential for not only the extraction of the intrinsic characterization of ME materials but also the sensing of a magnetic field in integrated flexible electronic systems.

关键词： magnetoelectric magnetostriction CoFe2O4 nanoparticles P(VDF-TrFE) organic field-effecttransistor magnetic sensor

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Field-effect transistor with a chemically synthesized MoS2 sensing channel for label-free and highly sensitive electrical detection of DNA hybridization

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Nano Research 2015年第7期8卷 2340-2350页

作者： Doo-Won Lee Jinhwan Lee II Yung Sohn Bo-Yeong kim Young Min Son Hunyoung Bark JaehyuckJung Minseok Choi Tae Hyeong kim Changgu Lee nae-Eung Lee Department of Advanced Materials Science & Engineering Sungkyunkwan University Suwon Gyunggi-do 440-746 Republic of Korea Department of Mechanical Engineering Sungkyunkwan University Suwon Gyunggi-do 440-746 Republic of Korea SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Suwon Gyunggi-do 440-746 Republic of Korea Samsung Advanced Institute for Health Sciences & Technology (SAIHST) Sungkyunkwan University Suwon Gyeonggi-do 440-746 Republic of Korea New Materials Team Future Device R&D Department LG Electronics Advanced Research Institute Seou1137-724 Republic of Korea These authors contributed equally to this work.

A field-effect transistor （FET） with two-dimensional （2D） few-layer MoS2 as a sensing-channel material was investigated for label-free electrical detection of the hybridization of deoxyribonucleic acid （DNA） molecules. The high-quality MoS2-channel pattern was selectively formedthrough the chemical reaction of the Mo layer with H2S gas. The MoS2 FET was very stable in an electrolyte and inert to pH changes due to the lack of oxygen-containing functionalities on the MoS2 surface. Hybridization of single-stranded target DNA molecules with single-stranded probe DNA molecules physically adsorbed on the MoS2 channel resulted in a shift of the threshold voltage （Vt,） in the negative direction and an increase in the drain current. The negative shift in Vth is attributed to electrostatic gating effects induced by the detachment of negatively charged probe DNA molecules from the channel surface after hybridization. A detection limit of 10 fM, high sensitivity of 17 mWdec, and high dynamic range of 106 were achieved. The results showed that a bio-FET with an ultrathin 2D MoS2 channel can be used to detect very small concentrations of target DNA molecules specifically hybridized with the probe DNA molecules.

关键词： two-dimensional(2D)materials, MoS2,field-effect transistor, biosensor,deoxyribonucleic acid (DNA) hybridization

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Do Birth Season and Sex Affect Adult Lung Function as Early Life Factors?

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Health 2017年第2期9卷 223-236页

作者： Tae Beom kim I-nae Park Department of Urology Gachon University Gil Hospital Incheon Republic of Korea Department of Pulmonology Inje University Seoul Paik Hospital Seoul Republic of Korea

Objectives: Although lung function decline is a normal ageing process, it can be potentiated by risk factors. However, the potential impact of early life factors on lung function decline has been scarcely studied. The aim of this study was to investigate the potential correlation between birth season and adult lung function. Methods: We enrolled 1008 South Korean patients (530 men and 478 women;age range, 40 - 80 years) who were hospitalized for urological surgery, irrespective of respiratory disease. All patients underwent the pulmonary function test before any surgery or procedure. Based on their birth season, the patients were divided into two groups (spring, summer, and fall vs. winter). Results: Forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and FEV1 % predicted of men born in winter were lower than those of men born in other seasons. Univariate and multivariate analyses using linear regression models also showed that birth season was a significant predictive factor for FVC, FEV1, and FEV1 % predicted in men. However, birth season was not correlated with lung function in women. Among male ever-smokers, FEV1 and FEV1 % predicted were lower for men born in winter than for those born in other seasons. Conclusions: Unlike women, men born in winter had lower lung function than did men born in other seasons. These results suggest that birth season might be an early life factor that predicts airway function. Furthermore, birth season has different effects on adult lung function depending on the patient’s sex.

关键词： Birth Season Early Life Factor Sex Lung Function

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Effects of a Low-Head Dam Removal on River Morphology and Riparian Vegetation: A Case Study of Gongreung River

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Journal of Water Resource and Protection 2014年第18期6卷 1682-1690页

作者： Si nae kim Yuji Toda Tetsuro Tsujimoto Department of Civil Engineering Nagoya University Nagoya Japan

The long term existence of a low-head dam in the river channel significantly affects river geomorphology and river ecosystem. Because more and more low-head dam structures have deteriorated in recent years, the attention for low-head dam removal is increasing as one of alternatives for river restoration. Thus, this study intends to investigate the impacts of low-head dam removal on river geomorphology and riparian vegetation with developing a quantitative method to predict the changes of river morphology as well as invasion, growth, expansion and destruction of riparian vegetation after a low-head dam removal. To verify the numerical simulation model, the low-head dam removal case in Gongreung River was employed with investigation of low-head dam removal responses on river geomorphology and riparian vegetation. Following the low-head dam removal, the results of monitoring and numerical simulation indicated that new sand bars has formed as well as increasing the extent of existing sand bars in the upstream of the low-head dam. The sand bars have been colonized in a year after the low-head dam removal by grass type plants. After a decade to several decades, the riparian vegetation in sand bars often developed to tree type plants in several low-head dam removal cases. As other cases, Gongreung River also showed the growth of tree type plants in 5 years after the removal.

关键词： Low-Head Dam Removal River Morphology Riparian Vegetation Numerical Simulation

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Usefulness of the acromioclavicular joint cross-sectional area as a diagnostic image parameter of acromioclavicular osteoarthritis

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World Journal of Clinical Cases 2022年第7期10卷 2087-2094页

作者： Young Joo Jee Youn Moon Jung Youn Han Yun-Sic Bang Keum nae Kang Young Su Lim Young-SoonChoi Young-Uk kim Department of Anesthesiology and Pain Medicine CHA Ilsan Medical CenterSchool of MedicineCHA UniversityIlsanGyeonggi-do 10414South Korea Department of Anesthesiology and Pain Medicine Seoul National University Hospital College of MedicineSeoul 03080South Korea Department of Anesthesiology and Pain Medicine CHA Bundang Medical CenterSchool of MedicineSeongnamGyeonggi-do 13496South Korea Department of Anesthesiology and Pain Medicine National Police HospitalSeoul 05715South Korea Department of Anesthesiology and Pain Medicine Catholic Kwandong UniversityCollege of MedicineInternational St.Mary’s HospitalIncheon 22711South Korea

BACKGROUND Acromioclavicular joint(ACJ)space narrowing has been considered to be an important diagnostic image parameter of ACJ osteoarthritis(ACJO).However,the morphology of the ACJ space is irregular because of osteophyte formation,subchondral irregularity,capsular distention,sclerosis,and ***,we created the ACJ cross-sectional area(ACJCSA)as a new diagnostic image parameter to assess the irregular morphologic changes of the *** To hypothesize that the ACJCSA is a new diagnostic image parameter for *** ACJ samples were obtained from 35 patients with ACJO and 30 healthy individuals who underwent shoulder magnetic resonance(S-MR)imaging that revealed no evidence of *** coronal,T2-weighted,fat-suppressed SMR images were acquired at the ACJ level from the two *** measured the ACJCSA and the ACJ space width(ACJSW)at the ACJ on the S-MR images using our imaging analysis *** ACJCSA was measured as the cross-sectional area of the *** ACJSW was measured as the narrowest point between the acromion and the *** The average ACJCSA was 39.88±10.60 mm;in the normal group and 18.80±5.13 mm;in the ACJO *** mean ACJSW was 3.51±0.58 mm in the normal group and 2.02±0.48 mm in the ACJO *** individuals had significantly lower ACJCSA and ACJSW than the healthy *** operating characteristic curve analyses demonstrated that the most suitable ACJCSA cutoff score was 26.14 mm^(2),with 91.4%sensitivity and 90.0%*** The optimal ACJSW cutoff score was 2.37 mm,with 88.6%sensitivity and 96.7%*** though both the ACJCSA and ACJSW were significantly associated with ACJO,the ACJCSA was a more sensitive diagnostic image parameter.

关键词： Acromioclavicular joint Osteoarthritis Cross-sectional area Diagnosis

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