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Iwahori, Yutaka,Ishikawa, Takashi,Watanabe, Naoyuki,Ito, Akira,Hayashi, Yoichi,Sugimoto, Sunao The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2
Experimental investigations of interlaminar mechanical properties for carbon fiber reinforced plastic (CFRP) laminates were carried out using aramid fiber ($Kevlar^{(R)}$-29 1000d) and carbon fiber (TR40-1K 612d, Mitsubishi Rayon) stitching. Various carbon fiber (CF) stitch densities were used to prepare a number of CF stitched CFRP laminates for double cantilever beam (DCB) tests. An insert tongue-type loading fixture, developed by the Japan Aerospace Exploration Agency (formerly the National Aerospace Laboratory of Japan), was also employed in the DCB test. Interlaminar tension tests were carried out under an out-of-plane directional loading using a single CF stitch thread in the CFRP laminates. The DCB test results clarified that the relationship between the volume fractions of the CF stitch thread ($V_{ft}$) and mode I critical energy release rate ($G_{Ic}$) showed a mostly linear function with a higher gradient than that of the $Kevlar^{(R)}$ stitched CFRP laminates. The CF stitched CFRP tension test results indicated that the consumption energy per unit area ($E_i$) was larger than that of $Kevlar^{(R)}$ stitched CFRP laminates.
Masayuki Izumi,Yutaka Makimura,Simone Dedola,Akira Seko,Akiko Kanamori,Masafumi Sakono,Yukishige Ito,Yasuhiro Kajihara 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
Biosynthesis of glycoproteins in the endoplasmic reticulum employs a quality control (QC) system, which discriminates and excludes misfolded malfunctional glycoproteins from correctly folded one. In the QC system, UDP-glucose:glycoprotein glucosyltransferase (UGGT) recognizes misfolded glycoprotein bearing high-mannose type N-glycan and glucosylate it so that the misfolded proteins can interact with molecular chaperones calnexin/calreticulin to attain correctly folded structure. As chemical tools to study glycoprotein quality control system at molecular level, we systematically synthesized misfolded homogeneous glycoproteins bearing high-mannose type oligosaccharide. Interleukin 8 (IL-8) is a nonglycosylated protein consisted of 72 amino acid residues and two disulfide bonds between Cys7–Cys34 and Cys9–Cys50. As a model, we incorporated high-mannose type (Man9GlcNAc2) oligosaccharide at the Asn36. The full-length glycosylpolypeptide chain was successfully synthesized by native chemical ligation between N-terminal 33-amino acid peptide-thioester and C-terminal 39-amino acid glycopeptide, which was prepared with Fmoc-Asn derivative having high-mannose oligosaccharide on the side chain.Extensive folding experiments of chemically synthesized homogeneous IL-8 glycopeptide yielded correctly folded glycoprotein with native disulfide bond patterns as well as misfolded glycoproteins with non-native disulfide bond patterns and a disulfide bond-linked misfolded homodimer. Other misfolded glycoprotein models with one and no disulfide bond and glycopeptides consisted of C-terminal 39-amino acid residues were also prepared. Transfer of glucose residue to these homogeneous glycoprotein analogues by UGGT was analyzed by using LC-MS. This assay proved that the critical endoplasmic reticulum folding sensor enzyme, UGGT recognizes misfolded glycosyl-IL-8s with different preferences. The most favored substrate was a homodimer which exhibits molten globule-like hydrophobic nature, and the least favored substrate was a correctly folded glycosyl-IL-8. Glycoproteins and glycopeptides having non-native disulfide bonds were also favored substrates.
Design of Low Power All-Optical Networks with Dynamic Lightpath Establishment
Hirata, Kouji,Ito, Kohei,Fukuchi, Yutaka,Muraguchi, Masahiro The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
In multifiber all-optical networks, optical amplifiers are used for amplifying multiple optical signals with different wavelengths in fibers. An optical amplifier operates when any of lightpaths passes through it. Therefore, it should simultaneously amplify as many lightpaths as possible for efficiently utilizing its power. This paper proposes a dynamic lightpath establishment scheme considering the use efficiency of the optical amplifiers and the depletion of the wavelength resources in multifiber all-optical networks. The proposed scheme provides a routing and wavelength assignment strategy that reduces both the power consumption of the optical amplifiers and the blocking probability of the lightpath establishment. Through simulation experiments, we demonstrate the effectiveness of the proposed scheme.
Yoshihide Kanno,Kei Ito,Shinsuke Koshita,Takahisa Ogawa,Hiroaki Kusunose,Kaori Masu,Toshitaka Sakai,Toji Murabayashi,Sho Hasegawa,Fumisato Kozakai,Yujiro Kawakami,Yuki Fujii,Yutaka Noda 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.3
Background/Aims: Although both radial- and convex-arrayed endoscopic ultrasonography (EUS) scopes are widely used forobservational EUS examinations, there have been few comparative studies on their power of visualization. The aim of this study was toevaluate the capability of these EUS scopes for observation of the pancreatobiliary junction. Methods: The rate of successful visualization of the pancreatobiliary junction was retrospectively compared between a radial-arrayedand a convex-arrayed echoendoscope, from a prospectively maintained database. Study periods were defined as January 2010 toDecember 2012 for the radial group, and February 2015 to October 2016 for the convex group because the respective scope wasmainly used during those periods. Results: During the study period, 1,660 cases with radial EUS and 1,984 cases with convex EUS were recruited. The success rates ofobservation of the pancreatobiliary junction were 80.0% and 89.5%, respectively (p<0.0001). Conclusions: The capability of visualization of the pancreatobiliary junction in observational EUS was found to be better with aconvex-arrayed than with a radial-arrayed echoendoscope