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RISS 인기검색어
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- 저자 : Kim Yongwoo (검색결과 247 건)
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Axonal Neuropathy-associated TRPV4 Regulates Neurotrophic Factor-derived Axonal Growth
Jang, Yongwoo,Jung, Jooyoung,Kim, Hyungsup,Oh, Jungeun,Jeon, Ji Hyun,Jung, Saewoon,Kim, Kyung-Tai,Cho, Hawon,Yang, Dong-Jin,Kim, Sung Min,Kim, In-Beom,Song, Mi-Ryoung,Oh, Uhtaek American Society for Biochemistry and Molecular Bi 2012 The Journal of biological chemistry Vol.287 No.8
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Sungchul Kim,Yongwoo Jeon,Je-Hun Lee,Byung Du Ahn,Sei Yong Park,Jun-Hyun Park,Joo Han Kim,Jaewoo Park,Dong Myong Kim,Dae Hwan Kim IEEE 2010 IEEE electron device letters Vol.31 No.11
<P>The relation between the low-frequency noise (LFN) and subgap density of states (DOS) of amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) is investigated by changing the postannealing temperature from 150°C to 300°C. It is found that the density of the tail states in the TFT annealed at 300°C (showing the lowest LFN) is prominently lower than those in the TFTs annealed at 250°C and 150°C. The densities of the tail states in the TFTs annealed at 250°C and 150°C (indicating similar LFN) are almost the same. In addition, it is clearly observed that the increased DOS of the a-IGZO TFT subjected to ac gate voltage stress results in a higher LFN compared with one without electrical stress. Hooge's parameters α<I>H</I>'s are extracted to be ~4.5 × 10<SUP>-3</SUP> (for the TFT annealed at 300°C) and ~1 × 10<SUP>-2</SUP> (for the TFTs annealed at 25°C and 150°C as well as for the TFT annealed at 300°C after the application of electrical ac stress). Therefore, the role of an a-IGZO subgap DOS on a LFN characteristic seems to be originated from the generation-recombination noise-induced carrier number fluctuation (via trap centers in the DOS tail states) while its correlation with the carrier mobility fluctuation is not clear except for the slope close to -1 in the logarithmic curve with the normalized power spectral density versus the gate overdrive voltage.</P>
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Three-Dimensionally Printed Micro-electromechanical Switches
Lee, Yongwoo,Han, Jungmin,Choi, Bongsik,Yoon, Jinsu,Park, Jinhee,Kim, Yeamin,Lee, Jieun,Kim, Dae Hwan,Kim, Dong Myong,Lim, Meehyun,Kang, Min-Ho,Kim, Sungho,Choi, Sung-Jin American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.18
<P>Three-dimensional (3D) printers have attracted considerable attention from both industry and academia and especially in recent years because of their ability to overcome the limitations of two-dimensional (2D) processes and to enable large-scale facile integration techniques. With 3D printing technologies, complex structures can be created using only a computer-aided design file as a reference; consequently, complex shapes can be manufactured in a single step with little dependence on manufacturer technologies. In this work, we provide a first demonstration of the facile and time-saving 3D printing of two-terminal micro-electromechanical (MEM) switches. Two widely used thermoplastic materials were used to form 3D-printed MEM switches; freely suspended and fixed electrodes were printed from conductive polylactic acid, and a water-soluble sacrificial layer for air-gap formation was printed from poly(vinyl alcohol). Our 3D-printed MEM switches exhibit excellent electromechanical properties, with abrupt switching characteristics and an excellent on/off current ratio value exceeding 10<SUP>6</SUP>. Therefore, we believe that our study makes an innovative contribution with implications for the development of a broader range of 3D printer applications (e.g., the manufacturing of various MEM devices and sensors), and the work highlights a uniquely attractive path toward the realization of 3D-printed electronics.</P> [FIG OMISSION]</BR>
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기존 3차원 인터랙션 동작인식 기술 현황 파악을 위한 메타분석
김용우(YongWoo Kim),황민철(Min Cheol Whang),김종화(Jong Hwa Kim),우진철(Jin Cheol Woo),김치중(ChiJung Kim),김지혜(Ji Hye Kim) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.6
Most of the research on three-dimensional interaction field have showed different accuracy in terms of sensing, mode and method. Furthermore, implementation of interaction has been a lack of consistency in application field. Therefore, this study is to suggest research trends of three-dimensional interaction using meta-analysis. Searching relative keyword in database provided with 153 domestic papers and 188 international papers covering three-dimensional interaction. Analytical coding tables determined 18 domestic papers and 28 international papers for analysis. Frequency analysis was carried out on method of action, element, number, accuracy and then verified accuracy by effect size of the meta-analysis. As the results, the effect size of sensor-based was higher than vision-based, but the effect size was extracted to small as 0.02. The effect size of vision-based using hand motion was higher than sensor-based using band motion. Therefore, implementation of three-dimensional sensor-based interaction and vision-based using hand motions more efficient. This study was significant to comprehensive analysis of three-dimensional motion recognition for interaction and suggest to application directions of three-dimensional interaction.
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Heesung Lee,Junyeap Kim,Jaewon Kim,Seong Kwang Kim,Yongwoo Lee,Jae-Young Kim,Jun Tae Jang,Jaewon Park,Sung-Jin Choi,Dae Hwan Kim,Dong Myong Kim IEEE 2017 IEEE electron device letters Vol.38 No.5
<P>Amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) are investigated for a possible application to infrared (IR) photodetector through subgap density-ofstates over the forbidden bandgap. The origin of the sub-bandgap(hν <;E<SUB>g</SUB>) photo-response in a-IGZO TFTs is due to optically pumped electrons from the photo-responsive subgap states (E<SUB>C</SUB>-E<SUB>ph</SUB><;E<SUB>t</SUB><;E<SUB>F</SUB>). Among the sub-bandgap lights, we investigate the reproducible IR photo-response in a-IGZO TFTs as a photodetector without the persistent photoconductivity(PPC) effect. In this letter, we characterize the IR photo-response mechanism through various optical and electrical measurements on the wavelength, optical power, bias-modulated quasi-Fermi level, and photoresponsive states. This result is expected to provide independent and/or integrated IR detector with transparent substrate combined with a-IGZO TFTs.</P>
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EEG 코히런스에 의한 집중한 손 동작 예측에 관한 연구
우진철(Jincheol Woo),황민철(Mincheol Whang),김종화(Jongwha Kim),김치중(Chijoong Kim),김용우(Yongwoo Kim),김지혜(Jihye Kim),김동근(Dong Keun Kim) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.2
The study is to find relative EEG power spectrum and pattern of coherence discriminating attentive and inattentive hand movements. Eight undergraduate students aged from 20 to 27 who had not hand disability participated in this study. Participants were asked to perform visuo-motor task. EEG was measured at C3 in 10~20 international system and four areas orthogonally directed 2.5cm away from C3. Significant result discriminating movement and rest was found through coherence analysis between movement areas or movement area and non-movement area, but was individually different. Because it was anticipated that major factors caused by the differences among individuals were attributed to the attention of the subjects, relative power of alpha and beta bands was identified. As a result, significant relative powers of alpha and beta bands were found in a group of high coherence level, but were not found in a group of low level. Next, participants were divided into two groups according to relative powers of alpha and beta bands. The comparison between two groups was performed. As a result, the coherence of the alpha band in the attentive group was greater than that of the inattentive group. It was found that the coherence of the beta band in the inattentive group was happening. Therefore, individual differences of coherence were influenced by attention. The significant coherence patterns that could discriminate attentive movement and inattentive movement were found.
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Bio-Inspired Stretchable and Contractible Tough Fiber by the Hybridization of GO/MWNT/Polyurethane
Kim, Hyunsoo,Jang, Yongwoo,Lee, Dong Yeop,Moon, Ji Hwan,Choi, Jung Gi,Spinks, Geoffrey. M.,Gambhir, Sanjeev,Officer, David L.,Wallace, Gordon G.,Kim, Seon Jeong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.34
<P>Spider silks represent stretchable and contractible fibers with high toughness. Those tough fibers with stretchability and contractibility are attractive as energy absorption materials, and they are needed for wearable applications, artificial muscles, and soft robotics. Although carbon-based materials and poly(vinyl alcohol) (PVA) composite fibers exhibit high toughness, they are still limited in low extensibility and an inability to operate in the wet-state condition. Herein, we report stretchable and contractible fiber with toughness that is inspired by the structure of spider silk. The bioinspired tough fiber provides 495 J/g of gravimetric toughness, which exceeds 165 J/g of spider silk. Besides, the tough fiber was reversibly stretched to ∼80% strain without damage. This toughness and stretchability are realized by hybridization of aligned graphene oxide/multiwalled carbon nanotubes in a polyurethane matrix as elastic amorphous regions and β-sheet segments of spider silk. Interestingly, the bioinspired tough fiber contracted up to 60% in response to water and humidity similar to supercontraction of the spider silk. It exhibited 610 kJ/m<SUP>3</SUP> of contractile energy density, which is higher than previously reported moisture driven actuators. Therefore, this stretchable and contractible tough fiber could be utilized as an artificial muscle in soft robotics and wearable devices.</P> [FIG OMISSION]</BR>
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