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Contact Resistance Properties of Electron-beam-cured Anisotropic Conductive Films
Inhyuk Lee,김재용 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
An anisotropic conductive film (ACF) is a thin adhesive epoxy layer that is widely used toconnect circuits in highly-integrated electronic devices. To bind two electric circuits, an ACFis pasted between the circuits and pressed with an optimum pressure so that the joints can beelectronically connected. For the curing of the resin, electron-beam (E-beam) irradiation is known tobe an environmentally friendly technique and exhibits many technical advantages over conventionalthermal curing in terms of low temperature and reduced curing time. In this method, the appliedpressure and electron-beam dose are critical parameters to maximize the conductivity without afailing of the connection between the circuits. For the minimization of the contact resistance aftercuring by using E-beam irradiation, curable epoxy resin was mixed with conductive particles madeof Ni/Au-plated polymer spheres with a mean particle size of 10 µm in a ratio of 5 : 1 by weight. The mixed resin was pasted on rigid boards having circuits of 100-µm pitch and was irradiated byusing an E-beam. The optimum dose for E-beam irradiation for a reasonable curing, the contactresistance values, and the reliability of the cured film were systematically investigated as functions ofE-beam dose, applied pressure and temperature. The lowest contact resistance values were obtainedwhen the specimens were irradiated by an 80-kGy E-beam under a constant pressure of 5 kgf/cm2. At this condition, the minimum contact resistance was 80 ± 0.015 m, which is significantly lowerthan the values obtained from commercial products, and the values were maintained within a 5%increase when the samples were kept at 100 C for 294 hours. Our results demonstrate that anE-beam irradiation technique can be applied for curing ACFs for commercial electronic devices.
Control of IPMC-based Artificial Muscle for Myoelectric Hand Prosthesis
Lee Myoung-Joon,Jung Sung-Hee,Moon Inhyuk,Lee Sukmin,Mun Mu-Seong The Korean Society of Medical and Biological Engin 2005 의공학회지 Vol.26 No.5
This paper proposes an ionic polymer metal composite (IPMC) based artificial muscle to be applicable to the Myoelectric hand prosthesis. The IPMC consists of a thin polymer membrane with metal electrodes plated chemically on both faces, and it is widely applying to the artificial muscle because it is driven by relatively low input voltage. The control commands for the IPMC-based artificial muscle is given by electromyographic (EMG) signals obtained from human forearm. By an intended contraction of the human flexor carpi ulnaris and extensor carpi ulnaris muscles, we investigated the actuation behavior of the IPMC-based artificial muscle. To obtain higher actuation force of the IPMC, the single layered as thick as $800[{\mu}m]$ or multi-layered IPMC of which each layer can be as thick as $178[{\mu}m]$ are prepared. As a result, the bending force was up to the maximum 12[gf] from 1[gf] by actuating the single layered IPMC with $178[{\mu}m]$, but the bending displacement was reduced to 6[mm] from 30[mm]. The experimental results using an implemented IPMC control system show a possibility and a usability of the bio-mimetic artificial muscle.
Yeo, Inhyuk,Lee, Yong-Jik,Song, Kyeongseop,Jin, Hyeon-Su,Lee, Jae-Eun,Kim, Dajeong,Lee, Dong-Woo,Kang, Nam Joo Elsevier 2018 Journal of biotechnology Vol.271 No.-
<P><B>Abstract</B></P> <P>Bioactive peptides contribute to various cellular processes including improved skin physiology. Hence, bioactive keratins have attracted considerable attention as active cosmetic ingredients for skin health. Here, we obtained low molecular weight (LMW) keratins from native chicken feathers by anaerobic digestion with an extremely thermophilic bacterium <I>Fervidobacterium islandicum</I> AW-1, followed by stepwise fractionation through ultrafiltration. To assess the effects of the feather keratins on skin health, we performed in vitro and ex vivo assays to investigate their inhibitory effects on matrix metalloproteinases (MMPs). As results, LMW feather keratins marginally inhibited collagenase, elastase, and radical scavenging activities. On the other hand, LMW feather keratins significantly suppressed the expression of ultraviolet B (UVB)-induced MMP-1 and MMP-13 in human dermal fibroblasts. Furthermore, phospho-kinase antibody array revealed that LMW feather keratins suppressed UVB-induced phosphorylation of Akts, c-Jun N-terminal kinases 1, p38 beta, and RSK2, but not ERKs in human dermal fibroblast. Overall, these results suggest that LMW feather keratins are potential candidates as cosmeceutical peptides for anti-skin aging.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anaerobic digestion of native chicken feathers with <I>Fervidobacterium islandicum</I> AW-1, followed by ultrafiltration, can produce low molecular weight (LMW, < 1 kDa) keratins. </LI> <LI> LMW feather keratins marginally inhibited collagenase, elastase, and radical scavenging activities. </LI> <LI> LMW feather keratins significantly suppressed the expression of UVB-induced MMP-1 and MMP-13 in human dermal fibroblasts. </LI> <LI> LMW feather keratins are potential candidates as cosmeceutical peptides for anti-skin aging. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
백인혁(Inhyuk Baek),신규식(Kyoosik Shin),이승찬(Seungchan Lee),이재찬(Jaechan Lee),한용훈(Yonghoon Han) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Capstone design greatly improved engineering students’ design skill. However undergraduate capstone-design still has many aspects to be improved. One of the demerits are the way of organizing team members of the undergraduate capstone-design projects. Since most of all the members are from same department, the projects topics are about technology development. Therefore these kind of projects are some distance from real product development projects. The real product development should provide many methodologies with the team members. This paper explains what are the main factors to make these projects successful and its effects on education.
Kim, Inhyuk,Woo, Kyoohee,Zhong, Zhaoyang,Ko, Pyungsam,Jang, Yunseok,Jung, Minhun,Jo, Jeongdai,Kwon, Sin,Lee, Seung-Hyun,Lee, Sungwon,Youn, Hongseok,Moon, Jooho The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.17
<P>Recently, the demand for stretchable strain sensors used for detecting human motion is rapidly increasing. This paper proposes high-performance strain sensors based on Ag flake/Ag nanocrystal (NC) hybrid materials incorporated into a polydimethylsiloxane (PDMS) elastomer. The addition of Ag NCs into an Ag flake network enhances the electrical conductivity and sensitivity of the strain sensors. The intense localized heating of Ag flakes/NCs is induced by intense pulsed light (IPL) irradiation, to achieve efficient sintering of the Ag NCs within a second, without damaging the PDMS matrix. This leads to significant improvement in the sensor sensitivity. Our strain sensors are highly stretchable (maximum strain = 80%) and sensitive (gauge factor = 7.1) with high mechanical stability over 10 000 stretching cycles under 50% strain. For practical demonstration, the fabrication of a smart glove for detecting the motions of fingers and a sports band for measuring the applied arm strength is also presented. This study provides an effective method for fabricating elastomer-based high-performance stretchable electronics.</P>
Measurements of assimilable organic carbon (AOC) in high saline conditions using P17
Mun, Eunjeong,Lee, Sangyoup,Kim, Inhyuk,Kwon, Boksoon,Park, Heedueng,Hong, Seungkwan IWA Publishing 2013 WATER SCIENCE AND TECHNOLOGY -WATER SUPPLY- Vol.13 No.2
sion='1.0' encoding='utf-8'?><!DOCTYPE article PUBLIC '-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN' 'journalpublishing.dtd'><article article-type='research-article' xmlns:xlink='http://www.w3.org/1999/xlink'><front><journal-meta><journal-id journal-id-type='pmc'>ws</journal-id><journal-id journal-id-type='pubmed'>WS</journal-id><journal-id journal-id-type='publisher'>Water Science & Technology: Water Supply</journal-id><issn pub-type='ppub'>1606-9749</issn><publisher><publisher-name>IWA Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type='doi'>10.2166/ws.2013.019</article-id><article-id pub-id-type='other'>jWSTWS.v13.i2.pg265</article-id><article-categories><subj-group><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Measurements of assimilable organic carbon (AOC) in high saline conditions using P17</article-title></title-group><contrib-group><contrib contrib-type='author' rid='aff1'><name><surname>Mun</surname><given-names>Eunjeong</given-names></name><xref ref-type='aff' rid='aff1'></xref></contrib><contrib contrib-type='author' rid='aff1'><name><surname>Lee</surname><given-names>Sangyoup</given-names></name><xref ref-type='aff' rid='aff1'></xref></contrib><contrib contrib-type='author' rid='aff1'><name><surname>Kim</surname><given-names>Inhyuk</given-names></name><xref ref-type='aff' rid='aff1'></xref></contrib><contrib contrib-type='author' rid='aff2'><name><surname>Kwon</surname><given-names>Boksoon</given-names></name><xref ref-type='aff' rid='aff2'></xref></contrib><contrib contrib-type='author' rid='aff1'><name><surname>Park</surname><given-names>Heedueng</given-names></name><xref ref-type='aff' rid='aff1'></xref></contrib><contrib contrib-type='author' rid='aff1'><name><surname>Hong</surname><given-names>Seungkwan</given-names></name><xref ref-type='aff' rid='aff1'></xref></contrib><aff id='aff1'>School of Civil, Environmental & Architectural Engineering, Korea University, 1, 5-ga, Anam-Dong, Sungbuk-Gu, Seoul, 136-713, Korea E-mail: <email>skhong21@korea.ac.kr</email></aff><aff id='aff2'>Environment G. Emerging Tech, Center/SAIT Samsung Electronics, Korea</aff></contrib-group><volume>13</volume><issue>2</issue><fpage>265</fpage><lpage>272</lpage><history><date date-type='received'><day>30</day><month>4</month><year>2012</year></date><date date-type='accepted'><day>6</day><month>9</month><year>2012</year></date></history><permissions><copyright-statement>© IWA Publishing 2013</copyright-statement><copyright-year>2013</copyright-year></permissions><abstract ><P>Biofouling caused by the deposition or growth of microorganisms on the membrane surface is one of the major concerns in nanofiltration (NF) and reverse osmosis (RO) processes. Assimilable organic carbon (AOC) has been a useful index to assess the growth potential of bacteria. In the case of drinking water, the AOC assay method has been widely applied to estimate growth or regrowth potential of bacteria in distribution and storage systems. However, studies on AOC measurement for high salinity water samples such as brackish water and seawater are rather scarce. The objective of this research is to investigate the influence of water salinity on the conventional AOC assay method. AOC samples with different salt concentrations were prepared by varying NaCl concentration from 0 to 35,000 mg/L, while the acetate concentration was held at 100 μg/L. The number of cells produced in water samples was measured by the heterotrophic plate count (HPC) method using R2A agar. The result showed that the cell production of <I>Pseudomonas fluorescens</I> strain P17 and <I>Spirillum</I> strain NOX decreased with increasing salinity. Especially, the growth of <I>Spirillum</I> strain NOX was noticeably influenced by water salinity. To further observe the relation between acetate concentration and cell production in high salinity water, organic-free saline water