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Development of a variable rate applicator for uniform fertilizer spreading

International Journal of Agricultural and Biological Engineering 2019年第2期12卷 82-89页

作者： Cheol-woo Han Sang-yoon Lee young-ki hong Gi-young Kweon Department of Bio-Industrial Machinery Engineering(Institute of Agriculture and Life Science) Gyeongsang National UniversityJinju 52828Korea Department of Agriculture Engineering National Academy of Agricultural ScienceRDAJeonju 54875Korea

Environmental impact and economic concerns have driven a variable rate technology(VRT).Spinner spreaders were mainly used for granular fertilizer application since they are simple in design,inexpensive,and can cover large ***,the spreader was not adequate for VRT because uniformity changes drastically while varying application ***,the purpose of this study was to develop a variable rate applicator with uniform spreading patterns.A commercial spreader was modified with a controller and electric actuators for controlling fertilizer discharge directions and *** was established to determine the optimum discharge direction according to the fertilizer application *** uniformity of spreading patterns in accordance with the spread amount per set unit area was evaluated by the statistical coefficient of variation(CV)lower than 15%is assumed to prevent damage to the *** results showed that CVs were 8%,9%,and 8%,respectively,for a tractor in race track mode(adjacent passes in same direction of travel)at 200 kg/hm^(2),300 kg/hm^(2),and 400 kg/hm^(2).This indicates that the fertilizer was spread uniformly,while the coefficient of variation was 12%at 200 kg/hm^(2) in back and forth mode(adjacent passes in the opposite direction of travel).Overall,the results suggest that the race track mode is suitable for operation of a tractor to ensure uniform spreading of fertilizer when applying at variable *** future goal is to establish a system for automatic variable rate application according to location in connection with soil analysis and geographic information systems.

关键词： variable rate technology fertilizer application uniform spreading spinner granular applicator fertilizer amount control

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A highly sensitive chemical gas detecting transistor based on highly crystalline CVD-grown MoSe2 films

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Nano Research 2017年第6期10卷 1861-1871页

作者： Jongyeol Baek Demin Yin Na Liu Inturu Omkaram Chulseung Jung Healin Im Seongin hong Seung Min kim young ki hong Jaehyun Hur youngki Yoon Sunkook kim Multi-Functional Nano/Bio Electronics Lab. Kyung Hee University Gyeonggi 446-701 Republic of Korea Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology (WIN) University of Waterloo Waterloo ON N2L 3GI Canada Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 565-905 Republic of Korea Department of Chemical and Biological Engineering Gachon University Seongnam-si Gyeonggi 13120 Republic of Korea

Layered semiconductors with atomic thicknesses are becoming increasingly important as active elements in high-performance electronic devices owing to their high carrier mobilities, large surface-to-volume ratios, and rapid electrical responses to their surrounding environments. Here, we report the first implementation of a highly sensitive chemical-vapor-deposition-grown multilayer MoSe2 field-effect transistor （FET） in a NO2 gas sensor. This sensor exhibited ultra-high sensitivity （S = ca. 1,907 for NO2 at 300 ppm）, real-time response, and rapid on-off switching. The high sensitivity of our MoSe2 gas sensor is attributed to changes in the gap states near the valence band induced by the NO2 gas absorbed in the MoSe2, which leads to a significant increase in hole current in the off-state regime. Device modeling and quantum transport simulations revealed that the variation of gap states with NO2 concentration is the key mechanism in a MoSe2 FET-based NO2 gas sensor. This comprehensive study, which addresses material growth, device fabrication, characterization, and device simulations, not only indicates the utility of MoSe2 FETs for high-performance chemical sensors, but also establishes a fundamental understanding of how surface chemistry influences carrier transport in layered semiconductor devices.

关键词： transition metaldichalcogenides MoSe2 chemical sensors chemical vapor depositon

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Erratum to： A highly sensitive chemical gas detecting transistor based on highly crystalline CVD-grown MoSe2 films

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Nano Research 2017年第8期10卷 I0002-I0004,F0003页

作者： Jongyeol Baek Demin Yin Na Liu Inturu Omkaram Chulseung Jung Healin Im Seongin hong Seung Min kim young ki hong Jaehyun Hur youngki Yoon Sunkook kim School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon 16419 Republic of Korea Department of Electrical and Computer Engineering & Waterloo Institute for Nanotechnology (WIN) University of Waterloo Waterloo ON N2L 3GI Canada Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 565-905 Republic of Korea Department of Chemical and Biological Engineering Gachon University Seongnam-si Gyeonggi 13120 Republic of Korea

AIMS ＆ SCOPENano Research is a peer-reviewed, international and interdisciplinary journal that focuses on all aspects of nanoscience and nanotechnology. Submissions are solicited in all topical areas, ranging from ba...

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Erratum to： Real-time electrical detection of epidermal skin MoS2 biosensor for point-of-care diagnostics

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Nano Research 2017年第3期10卷 I0002-I0002页

作者： Geonwook Yoo Heekyeong Park Minjung kim Won Geun Song Seokhwan Jeong Min Hyung kim Hyungbeen Lee Sang Woo Lee young ki hong Min Goo Lee Sungho Lee Sunkook kim School of Electronic Engineering Soongsil University Seou106978 Republic of Korea School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon 16419 Republic of Korea Department of Biomedical Engineering Yonsei University Wonju 26493 Republic of Korea Korea Electronics Technology Institute Gyeonggi 13488 Republic of Korea

The second affiliation of the authors in the original version of this article was unfortunately wrongly written on the first page, instead of Multi-Functional Nano/Bio Electronics Lab., Kyung Hee University, Gyeonggi ...

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Differential diagnosis and treatment of foot drop caused by an extraneural ganglion cyst above the knee:A case report

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World Journal of Clinical Cases 2022年第21期10卷 7539-7544页

作者： ki hong Won Eun young Kang Department of Rehabilitation Medicine Kwangju Christian HospitalGwangju 61661South Korea

BACKGROUND One of the causes of foot drop is compression of the common peroneal nerve caused by space-occupying lesions such as a synovial cyst or a ganglion *** previous reports have involved compressive common peroneal neuropathy by intraneural ganglion cysts and synovial *** of the peroneal nerve by extraneural ganglion cysts is *** report a rare case of compressive common peroneal neuropathy by an extraneural ganglion *** SUMMARY A 46-year-old man was hospitalized after he reported a right foot drop for 1 *** muscle testing revealed scores of 1/5 on dorsiflexion of the right *** and paresthesia on the right lateral leg and foot dorsum were *** was diagnosed with a popliteal cyst by using electrophysiologic study and popliteal ultrasound(US).To facilitate common peroneal nerve(CPN)decompression,2 cc of sticky gelatinous material was aspirated from the cyst under US *** stimulation and passive and assisted active ROM exercises of the right ankle and strengthening exercises for weak muscles using elastic band were prescribed based on the change of muscle power.A posterior leaf spring ankle-foot orthosis was prescribed to assist the weak dorsiflexion of the ***-up US revealed that the cystic lesion was growing and magnetic resonance imaging demonstrated compression of the CPN by the cystic *** cyst was resected to prevent impending compression of the *** Precise diagnosis and immediate treatment are important in cases of compressive common peroneal neuropathy caused by an extraneural cyst.

关键词： Foot drop Extranueral ganglion cyst Common peroneal neuropathy Popliteal ultrasound Electrodiagnostic study Cystectomy Case report

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An englacial image and water pathways of the Fourcade glacier on king George Island, Antarctic Peninsula, inferred from ground-penetrating radar

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Science China Earth Sciences 2010年第6期53卷 892-900页

作者： LEE Joohan kiM ki young hong Jong Kuk JIN young Keun Korea Polar Research Institute Songdo Techno Park7-50 Songdo-dong Yeonsu-gu Incheon 406-840 Korea Department of Geophysics Kangwon National UniversityChunchon 200-701 Korea

The distribution of small fractures and water content of the Fourcade glacier on king George Island, Antarctica, was investigated in November 2006 and December 2007 by two ground-based (470-and 490-m-long profiles) and one helicopter-borne (470-m-long profile) ground-penetrating radar (GPR) surveys using 50-, 100-, and 500-MHz antennas. Radar images in the pre-migrated GPR sections are characterized by a smooth ice surface and irregular bed topography, numerous diffraction hyperbolas in the ice and at the glacier bed, strong scattering noise, and near-surface folded layers. Scattering noise above a mound in the center of the profiles is associated with an area of dense fractures extending down from the ice surface that has relatively low reflection strength. Near the northeast ends of the profiles where few englacial fractures occur, scattering noise may result from the presence of warmer ice. A water-filled conduit and an air-filled cavity are interpreted as the source of two distinct hyperbolas in sub-glacial valleys based on the polarity of the reflections. Through migration velocity analysis on 106 hyperbolas, radar velocities were obtained for the 100-MHz ground-based profile. Using the velocities and Paren’s mixture formula, we calculated the water content of the ice to have been in the range of 0.00–0.09. High water content occurs near the glacier margin, in sub-glacial valleys, and in zones of scattering noise.

关键词： GPR water content Fourcade glacier scattering noise migration velocity analysis fractures

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Memristive Devices Based on Two-Dimensional Transition Metal Chalcogenides for Neuromorphic Computing

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Nano-Micro Letters 2022年第4期14卷 29-58页

作者： ki Chang Kwon Ji Hyun Baek Kootak hong Soo young kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34133Republic of Korea Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea UniversitySeoul 02841Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Two-dimensional(2D)transition metal chalcogenides(TMC)and their heterostructures are appealing as building blocks in a wide range of electronic and optoelectronic devices,particularly futuristic memristive and synaptic devices for brain-inspired neuromorphic computing *** distinct properties such as high durability,electrical and optical tunability,clean surface,flexibility,and LEGO-staking capability enable simple fabrication with high integration density,energy-efficient operation,and high *** review provides a thorough examination of high-performance memristors based on 2D TMCs for neuromorphic computing applications,including the promise of 2D TMC materials and heterostructures,as well as the state-of-the-art demonstration of memristive *** challenges and future prospects for the development of these emerging materials and devices are also *** purpose of this review is to provide an outlook on the fabrication and characterization of neuromorphic memristors based on 2D TMCs.

关键词： Two-dimensional materials Memristors Neuromorphic computing Artificial synapses Transition metal chalcogenides

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Installing a molecular truss beam stabilizes MOF structures

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npj Computational Materials 2022年第1期8卷 1110-1118页

作者： hong ki kim Jong-Yeong Jung Gyumin Kang Mu-Hyun Baik Eun-young Choi Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Center for Catalytic Hydrocarbon Functionalizations Institute for Basic Science(IBS)Daejeon34141Republic of Korea Korea Science Academy of KAIST 105-47 Baegyanggwanmun-roBusanjin-guBusan47162Republic of Korea

Enhancing the stability and durability of metal-organic frameworks(MOFs)is vital for practical applications because many promising MOF materials suffer from phase transitions and/or structural decompositions with humidity being a particularly damaging *** mechanical engineering,the frame of buildings and furniture can be stabilized significantly by installing a truss *** the same principle,we functionalized the organic component of MOF-5 to contain a carbazole moiety that can act as a molecular truss beam by reaching across the corner and forming a stableπ–πinteraction with a phenyl group on the edge position of the *** structural support enhanced the stability of the MOF substantially,allowing the designed MOF to maintain compositional integrity under steam conditions at 90℃for~5 *** unmodified MOF-5 shows clear signs of structural collapse after~1 h.

关键词： beam moiety durability

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Cutoff characteristics of dielectric-filled circular holes embedded in dispersive plasmonic medium

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Chinese Optics Letters 2009年第10期7卷 904-908页

作者： ki young kim Department of Physics National Cheng Kung University

The cutoff characteristics of dielectric-filled circular holes embedded in a dispersive plasmonic medium are investigated. Since two distinctive operating modes, surface plasmon polariton and circular waveguide modes, can exist in the slow and fast wave regions, respectively, the cutoff characteristics for each are separately investigated for linear and radial polarizations of the guided fields. As a result, the cutoff wavelengths for the linear and radial polarizations with very small subwavelength hole radii are found to be limited by the plasma resonance wavelength and plasma wavelength, which in turn are dependent and independent, respectively, of the dielectric constant of the dielectric filler material.

关键词： Circular waveguides Polarization Surface plasmon resonance

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Separation of primary solid phases from Al-Si alloy melts

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China Foundry 2014年第4期11卷 382-395页

作者： ki young kim School of Energy Materials and Chemical EngineeringKorea University of Technology and EducationChungnam 330-708Korea

The iron-rich solids formed during solidification of Al-Si alloys which are known to be detrimental to the mechanical,physical and chemical properties of the alloys should be *** the other hand,Al-Si hypereutectic alloys are used to extract the pure primary silicon which is suitable for photovoltaic cells in the solvent refining *** of the important issues in iron removal and in solvent refining is the effective separation of the crystallized solids from the Al-Si alloy *** paper describes the separation methods of the primary solids from Al-Si alloy melts such as sedimentation,draining,filtration,electromagnetic separation and centrifugal separation,focused on the iron removal and on the separation of silicon in the solvent refining process.

关键词： separation Al-Si alloys primary solids iron removal silicon extraction

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