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Enhanced third-harmonic generation by manipulating the twist angle of bilayer graphene

Light(Science & Applications) 2021年第2期10卷 176-185页

作者： Seongju Ha Nam Hun Park Hyeonkyeong Kim Jiseon Shin Jungseok Choi Sungmin Park Ji-yun Moon Kwanbyung Chae Jeil Jung jae-Hyun Lee Youngdong Yoo Ji-Yong Park Kwang Jun ahn Dong-Il Yeom Department of Energy Systems Research Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Korea Research Institute of Standards and Science Daejeon 34113Republic of Korea Department of Physics University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Smart Cities University of Seoul163 SiripdaeroDongdaemun-guSeoul 02504Republic of Korea Department of Materials Science and Engineering Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Chemistry Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea Department of Physics Ajou University206 Worldcup-roYeongtong-guSuwon 16499Republic of Korea

Twisted bilayer graphene(tBLG)has received substantial attention in various research fields due to its unconventional physical properties originating from Moire *** electronic band structure in tBLG modified by interlayer interactions enables the emergence of low-energy van Hove singularities in the density of states,allowing the observation of intriguing features such as increased optical conductivity and photocurrent at visible or near-infrared ***,we show that the third-order optical nonlinearity can be considerably modified depending on the stacking angle in *** third-harmonic generation(THG)efficiency is found to significantly increase when the energy gap at the van Hove singularity matches the three-photon resonance of incident *** study on electrically tuneable optical nonlinearity reveals that the gate-controlled THG enhancement varies with the twist angle in tBLG,resulting in a THG enhanced up to 60 times compared to neutral monolayer *** results prove that the twist angle opens up a new way to control and increase the optical *** tBLG,,suggesting rotation-induced tuneable nonlinear optics in stacked two-dimensional material systems.

关键词： twist angle harmonic

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WRA-Net:Wide Receptive Field Attention Network for Motion Deblurring in Crop and Weed Image

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Plant Phenomics 2023年第2期5卷 174-194页

作者： Chaeyeong yun Yu Hwan Kim Sung jae Lee Su Jin Im Kang Ryoung Park Division of Electronics and Electrical Engineering Dongguk University30 Pildong-ro 1-gilJung-guSeoul 04620Republic of Korea

Automatically segmenting crops and weeds in the image input from cameras accurately is essential in various agricultural technology fields,such as herbicide spraying by farming robots based on crop and weed segmentation ***,crop and weed images taken with a camera have motion blur due to various causes(e.g.,vibration or shaking of a camera on farming robots,shaking of crops and weeds),which reduces the accuracy of crop and weed ***,robust crop and weed segmentation for motion-blurred images is ***,previous crop and weed segmentation studies were performed without considering motion-blurred *** solve this problem,this study proposed a new motion-blur image restoration method based on a wide receptive field attention network(WRA-Net),based on which we investigated improving crop and weed segmentation accuracy in motion-blurred ***-Net comprises a main block called a lite wide receptive field attention residual block,which comprises modified depthwise separable convolutional blocks,an attention gate,and a learnable skip *** conducted experiments using the proposed method with 3 open databases:BoniRob,crop/weed field image,and rice seedling and weed *** to the results,the crop and weed segmentation accuracy based on mean intersection over union was 0.7444,0.7741,and 0.7149,respectively,demonstrating that this method outperformed the state-of-the-art methods.

关键词： Net shaking image

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Magnetic Force Enhanced Sustainability and Power of Cam-Based Triboelectric Nanogenerator

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Research 2021年第1期2021卷 370-380页

作者： Hakjeong Kim Hee jae Hwang Nghia Dinh Huynh Khanh Duy Pham Kyungwho Choi Dahoon ahn Dukhyun Choi Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYongin 17104Republic of Korea Department of Mechanical Engineering Korea Aerospace UniversityGoyang 10540Republic of Korea Division of Mechanical Engineering Kongju National UniversityCheonan 31080Republic of Korea

Since the first invention of triboelectric nanogenerators(TENGs)in 2012,many mechanical systems have been applied to operate TENGs,but mechanical contact losses such as friction and noise are still big obstacles for improving their output performance and ***,we report on a magnet-assembled cam-based TENG(MC-TENG),which has enhanced output power and sustainability by utilizing the non-contact repulsive force between the *** investigate the theoretical and experimental dynamic behaviors of MC-TENGs according to the effects of the contact modes,contact and separation times,and contact forces(i.e.,pushing and repulsive forces).We suggest an optimized arrangement of magnets for the highest output performance,in which the charging time of the capacitor was 2.59 times faster than in a mechanical cam-based TENG(C-TENG).Finally,we design and demonstrate a MC-TENG-based windmill system to effectively harvest low-speed wind energy,~4 m/s,which produces very low ***,it is expected that our frictionless MC-TENG system will provide a sustainable solution for effectively harvesting a broadband of wasted mechanical energies.

关键词： friction magnets generator

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Changes on optical coherence tomography angiography and fluorescein angiography in eyes with neovascular age-related macular degeneration

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International Journal of Ophthalmology(English edition) 2022年第11期15卷 1837-1844页

作者： So Min ahn Mihyun Choi Cheolmin yun Seong-Woo Kim jaeryung Oh Department of Ophthalmology Korea University College of MedicineSeoul 02841Republic of Korea

AIM:lo evaluate the changes on optical coherence tomography angiography(OCTA) and fluorescein angiography(FA) and their correlation in neovascular agerelated macular degeneration(nAMD) before and after intravitreal aflibercept injections(IAIs).METHODS:In 43 treatment-na?ve patients with nAMD,choroidal neovascularization(CNV) in OCTA were morphologically and quantitatively analyzed before and after IAIs to determine whether they are correlated with leakage on FA or *** combining CNV in OCTA and leakage in FA,lesions were characterized as three types:L+C+(with both CNV and leakage),L-C+(with CNV but without leakage),or L+C-lesion(with leakage outside CNV).RESULTS:Before IAI,while 27 eyes had L+C+lesion only,16 eyes had both L+C+and L-C+lesions *** capillaries and anastomosis in CNV were more developed in L+C+lesion,at 86.0% and58.1%,respectively,relative to 9.3% and 9.3% in L-C+lesions(P<0.001).After IAIs in 33 eyes,tiny capillaries and anastomosis were decreased in the lesions with cessation of leakage on FA(P<0.001 and P=0.001,respectively).In quantitative analysis,neovascularization length and numbers of junctions and endpoints were also significantly ***:Leakage on FA is associated with CNV morphology in OCTA and remained so after ***,by carefully assessing the morphological and quantitative changes of CNV in OCTA before and after treatment,activity of nAMD is expected even though CNV on OCTA is not completely matched with fluorescein leakage.

关键词： choroidal neovascularization fluorescein angiography leakage neovascular age-related macular degeneration optical coherence tomography angiography

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Electrical resistivity evolution in electrodeposited Ru and Ru-Co nanowires

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Journal of Materials Science & Technology 2022年第10期105卷 17-25页

作者： Jun Hwan Moon Seunghyun Kim Taesoon Kim Yoo Sang Jeon Yanghee Kim jae-Pyoung ahn Young Keun Kim Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Institute of Engineering Reserch Korea UniversitySeoul 02481Republic of Korea Advanced Analysis Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Research Resources Division Korea Institute of Science and TechnologySeoul 02792Republic of Korea

Nanoscale ruthenium(Ru)-based materials are promising replacements for existing multilayered Cu interconnects in integrated ***,it is not easy to apply the results of previously reported studies directly to the electrochemical damascene process because the previous studies have mainly focused on thin flms by dry ***,we report the electrical resistivity and microstructure of electrodeposited Ru *** estimate that the resistivity value of a 10 nm diameter Ru nanowire to be71.6μΩcm after analyzing the resistivity values of individual nanowires with various ***,we investigate the electrical properties of Ru_(x)Co_(1-x)nanowires where x is 0.04–0.99 at.%as possible replacements of the current Ta N barrier *** the entire composition range,the resistivity values of alloys are much lower than that of the conventional Ta ***,Ru and Ru-alloy nanowires surrounded by dielectric silica are thermally stable after 450°C heat ***,the nanoscale Ru and Ru-Co alloys possessing low resistivity values can be candidates for the interconnect and barrier materials,respectively.

关键词： Ruthenium(Ru) Ruthenium-cobalt(Ru-Co) Nanowire Electrical resistivity Microstructure Electrodeposition

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Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea

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Acta Oceanologica Sinica 2013年第1期32卷 12-23页

作者： KIM yun-Bae CHANG Kyung-Il PARK jae-Hun PARK Jong Jin East Sea Research Institute Korea Institute of Ocean Science and Technology Research Institute of Oceanography School of Earth and Environmental Sciences Seoul National University Ocean Science Research Department Korea Institute of Ocean Science and Technology Department of Oceanography Kyungpook National University

Subinertial fluctuation of a strong northward deep current, which is referred to the Dokdo Abyssal Current （DAC） by Chang et al. （2009）, is investigated from current records for about 16.5 and 8.0 months in the Ulle- ung Interplain Gap of the East/lapan Sea. The current below 300 m is bottom-intensified and has nearly depth-independent flow. Near bottom, the spectral peaks of the current were found near 10, 20, and 60 d. The DAC variability near 10 d and 20 d is reasonably consistent with the linear theory of topographic Rossby waves （TRWs） in the following aspects：（1） The motion is columnar and bottom-intensified; （2） the theo- retical cutoff frequency is similar to the observation; （3） The observation-based angles of the wavenumber vector are in good agreement with the theoretical ones. The wavelengths of the TRWs with periods of near 10 d and 20 d near Dokdo are significantly shorter than those with similar timescales in the open oceans （100-250 km）. It is primarily due to the weak stratification below 300 m in the East Sea. The deep cur- rent fluctuations with periods of near 10 d and 20 d were accompanied by warm events in the upper layer resulting from eddying processes and/or meandering of the Tsushima Warm Current.

关键词： East/Iapan Sea Ulleung Interplain Gap Deep currents Topographic Ressby waves

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Moisture sorption, thermal, and caking characteristics of L-lysine-carbonate granules

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FOOD BIOSCIENCE 2023年第3期53卷 2983-2990页

作者： An, Suyeon ahn, Sungahm Letona, Andres Shin, Ji Hyun Kang, Seung Hoon Jeong, jae yun Park, Sang Min Kim, Jun Woo Yu, Daeung Chung, Hee Chung, Donghwa Seoul Natl Univ Grad Sch Int Agr Technol Food Technol Major Pyeongchang 25354 South Korea CJ CheilJedang CJ BIO Res Inst Suwon 16495 South Korea Seoul Natl Univ Inst Food Industrializat Inst Green Bio Sci & Technol Pyeongchang 25354 South Korea Changwon Natl Univ Dept Food & Nutr Chang Won 51140 South Korea Seoul Natl Univ Ctr Food & Bioconvergence Seoul 08826 South Korea

L-Lysine, an essential amino acid, is often produced in the granular form of L-lysine-monohydrochloride (L-lysineHCl). To address chemical waste and processing cost concerns associated with the production of L-lysine-HCl granules, an alternative process has been recently developed for the production of L-lysine as granules of L-lysinecarbonate (L-lysine-CO3). In the present study, the moisture sorption, thermal, and caking properties of L-lysineCO3 granules were investigated in comparison with commercial L-lysine-HCl granules. L-Lysine-CO3 granules showed a popcorn-like surface structure (59.0% crystallinity), while L-lysine-HCl granules exhibited an angular crystalline structure (72.9% crystallinity). L-Lysine-CO3 granules had a less compact structure than L-lysine-HCl granules and showed excellent initial flowability comparable to L-lysine-HCl granules. L-Lysine-CO3 granules were more hygroscopic than L-lysine-HCl granules, probably due to their lower crystallinity and less compact structure. L-Lysine-CO3 granules began to undergo thermal decomposition at 192 degrees C, probably due to CO2 release, followed by melting at 234 degrees C and further decomposition, while L-lysine-HCl granules underwent melting at 251 degrees C, and then began to undergo thermal decomposition at 260 degrees C. No glass transition was observed for either lysine-CO3 or L-lysine-HCl granules. Storage test under pressurized and accelerated conditions showed that L-lysine-CO3 granules were more prone to caking and formed harder agglomerates than L-lysine-HCl granules. The results showed that L-lysine-CO3 granules were more hygroscopic, less thermally stable, and more prone to caking, compared to commercial L-lysine-HCl granules. However, these properties of L-lysine-CO3 granules were at acceptable levels for commercial use, thus L-lysine-CO3 granules have high potential for commercial development.

关键词： L-Lysine-carbonate granules Moisture sorption Thermal transition Thermal stability Caking

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Improved Cycle Properties of FeS_2 Cathode Material with Metallic Additives

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材料科学与工程学报 2007年第6期25卷 910-913页

作者： jae-Won Choi jae-Kwang Kim Gouri Cheruvally Jou-Hyeon ahn Ki-Won Kim Hyo-Jun ahn Dong-Kyu Park Department of Chemical & Biological Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea School of Nano and Advanced Materials Engineering and Engineering Research Institute Gyeongsang National University900 Gajwa-dongJinju660-701Korea Kaya Advanced Material Art Inc. Baekrok-Ri 1010-1Yangsan 626-862Korea

Iron disulfide(FeS_2)cathode active material was prepared from iron and sulfur at room temperature by high energy mechanical *** FeS_2 composites containing Co or Ni transition metal powders as additives were also prepared by the same *** cells with these FeS_2 cathodes were studied for charge-discharge properties at room temperature using 0.5M LiTFSI in tetra(ethylene glycol)dimethyl ether(TEGDME)*** voltammetry showed two anodic oxidation peaks at 1.8 and 2.5V and two cathodic reduction peaks at 2.0 and 1.3 V for FeS_2 with metal *** addition of 5wt% Co and 3wt% Ni resulted in an enhancement of the first discharge capacity giving 571 and 844mAh/g respectively at *** cycle performance was also enhanced remarkably by the addition of these electrically conductive transition metals in the active ***_2 with 5wt% Co exhibited a stable cycle performance delivering a reversible capacity of 338mAh/g(37.8% of theoretical capacity)after 20 cycles.

关键词：阴极材料二硫化铁锂离子电池循环性能

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Reconstruction of Rabbit Corneal Layer Composed of Corneal Fibroblasts and Corneal Epithelium on the Lyophilized Amniotic Membrane

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Chemical Research in Chinese Universities 2006年第2期22卷 150-156页

作者： ahn jae-il JANG In-keun YOON Mun-young SEO Young-kwon YOON Hee-hun KIN jae-chan SONG Kye-yong YANG Eun-kyung PARK Jung-keug Department of Chemical and Biochemical Engineering Dongguk University Seoul Korea Department of Ophthalmology Chung-Ang University Hospital Seoul Korea Department of Pathology College of Medicine Chung-Ang University Seoul Korea R & D Center Bioland Ltd. Chun-An Korea

Many researchers have employed the cryopreserved amniotic membrane（CAM） and corneal epithelial cells in the treatment of a severely damaged burned cornea, with corneal epithelial cells cultured on an amniotic membrane （AM）. The lyophilized amniotic membrane（LAM） has a higher graft take and a longer shelf life; it is easier to store and safer because of gamma irradiation. Two Teflon rings（ ahn＇s supporter） were made for culturing the cells on the LAM, and were then used to support the LAM. To reconstruct a corneal layer composed of corneal fibroblasts and epithelium, the corneal fibroblasts were first cultivated on the stromal side of LAM for five days, foUowed by epithelial cells culture on the epithelial side, by using the air-liquid interface culture. The reconstructed corneal layer composed of corneal fibroblasts and corneal epithelial cells has a much healthier basal layer of corneal epithelium than the reconstructed corneal epithelium, which was got by using only corneal epithelial cells, and resembles the epithelium of normal corneas, without the horny layer. Thus, the reconstruction of the corneal layer by using a LAM is considered to be a good in vitro model, not only for its application in toxicological test kits, but also for transplantation in patients with a severely damaged cornea.

关键词： Lyophilized amniotic membrane Corneal layer Corneal fibroblast Corneal epithelium

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Ameliorating liver fibrosis in an animal model using the secretome released from miR-122-transfected adipose-derived stem cells

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World Journal of Stem Cells 2019年第11期11卷 990-1004页

作者： Kee-Hwan Kim jae Im Lee Ok-Hee Kim Ha-Eun Hong Bong Jun Kwak Ho Joong Choi Joseph ahn Tae yun Lee Sang Chul Lee Say-June Kim Department of Surgery Uijeongbu St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 11765South Korea Catholic Central Laboratory of Surgery Institute of Biomedical IndustryCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Seoul St.Mary’s HospitalCollege of Medicinethe Catholic University of KoreaSeoul 06591South Korea Department of Surgery Daejeon St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 34943South Korea

BACKGROUND Recently,the exclusive use of mesenchymal stem cell(MSC)-secreted molecules,called secretome,rather than cells,has been evaluated for overcoming the limitations of cell-based therapy,while maintaining its ***,the use of na?ve secretome may not fully satisfy the specificity of each ***,it appears to be more advantageous to use the functionally reinforced secretome through a series of processes involving physico-chemical adjustments or genetic manipulation rather than to the use na?ve *** To determine the therapeutic potential of the secretome released from miR-122-transfected adipose-derived stromal cells(ASCs).METHODS We collected secretory materials released from ASCs that had been transfected with antifibrotic miR-122(MCM)and compared their antifibrotic effects with those of the na?ve secretome(CM).MCM and CM were intravenously administered to the mouse model of thioacetamide-induced liver fibrosis,and their therapeutic potentials were *** MCM infusion provided higher therapeutic potential in terms of:(A)Reducing collagen content in the liver;(B)Inhibiting proinflammatory cytokines;and(C)Reducing abnormally elevated liver enzymes than the infusion of the na?ve *** proteomic analysis of MCM also indicated that the contents of antifibrotic proteins were significantly elevated compared to those in the na?ve *** We could,thus,conclude that the secretome released from miR-122-transfected ASCs has higher antifibrotic and anti-inflammatory properties than the na?ve *** miR-122 transfection into ASCs provides a specific way of potentiating the antifibrotic properties of ASC secretome,it could be considered as an enhanced method for reinforcing secretome effectiveness.

关键词： Adipose-derived stem cells Liver fibrosis MicroRNAs miR-122 Mesenchymal stem cells Secretome

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