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Synthesis and Characterization of Polymethylsilsesquioxane-based Hybrid Polymers
Han, Seung Hoon,Lee, Ji Young,Koo, Sang Man 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.5
The preparation of polymethylsilsesquioxane (PMSQ) copolymers having the composition -[MeHSiO]_(0.3) [MeSi(O)_(1.5)]_(0.7)- was investigated. The reaction variables, such as the amounts of solvent and catalyst and the reaction time and temperature, had a great influence on the molecular weight and the polydispersity. PMSQ copolymer was unstable: it transformed into an intractable gel after it became pure liquid by removing the solvent. This high reactivity of PMSQ copolymer can be controlled by modification of the Si-H groups in its backbone using Pt-catalyzed hydrosilylation reactions. The hydrosilylation of PMSQ with organic functional groups also provides copolymers that have further processibility toward coating application. These polymers were characterized by IR and NMR spectroscopy and by and GPC. TGA was used to investigate the thermal stabilities of these polymers.
A Compact Broadband Beam-Forming Network Design using an Equivalent Phase Delay
Han, Sang-Min,Kwon, Koo Hyung,Kim, Young-Sik 고려대학교 컴퓨터과학기술연구소 2003 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.5 No.-
New compact, broadband phase shifter and its equivalent phase deay line for the design of beam-forming network are proposed. The phase shifter is able to control a 120˚phase shift continuously, and the phase delay line for a reference phase has a fixed 60˚shifted phase. Both have the low phase error of less than ±3.5˚and the low gain variations of less than 1dB within the 300MHz bandwidth. These can be adequate to form the effcient beam-forming networks with compactness, broadband, less complexity and low cost.
Han, Sang-Yun,Rho, Sum,Noh, Gyeong Eon,Kim, Jin-Koo The Korean Society of Fisheries and Aquatic Scienc 2018 Fisheries and Aquatic Sciences Vol.21 No.5
Interspecific hybridization experiments were conducted between the common seahorse Hippocampus kuda (male) and the slender seahorse H. reidi (female) during artificial rearing to develop a new aquarium fish with unique polyandrous mating. Molecular analysis via mitochondrial DNA (mtDNA) cytochrome b and nuclear DNA (ncDNA) ribosomal protein S7 gene supported the hybridization between the two species, and the hybrid also showed morphological characteristics of both species. Juveniles of H. kuda have dense melanophores on the whole body or only on the trunk and tail, whereas juveniles of H. reidi have thin melanophores on the whole body or present in stripes only along their prominent trunk and tail rings. However, all the hybrid juveniles had dense melanophores only on the tail, with the striped trunk rings, thus showing an intermediate pattern, and these patterns were limited to the fairly early stage of development (1-10 days old). In contrast, the two eye spines in the hybrid were apparent after 9 days old, which were not inherited from H. kuda (one eye spine), but from H. reidi (two eye spines). According to LOESS (local regression) analysis, the growth rate increased between 20 and 25 days, and the hybrids grew faster than H. kuda when they entered the explosive second phase of growth between 25 and 45 days for all the seahorses. This study highlights the hybridization between H. kuda and H. reidi may contribute to the improved taxonomic information of young seahorses.
Inflammatory myofibroblastic tumor occurs in an Africa Green Monkey (Chlorocebus aethiops)
Han-Na Kim,Seung-Min Ha,Hwal-Yong Lee,Bon-Sang Koo,Youngjeon Lee,Jung-Joo Hong,Seung Ho Baek,Chang-Yeop Jeon,Sang Je Park,Young-Hyun Kim,Kang Jin Jeong,Jae-Won Huh,Sang-Rae Lee,Yeung Bae Jin 한국실험동물학회 2019 한국실험동물학회 학술발표대회 논문집 Vol.2019 No.1
Han, Sang-Yun,Kim, Jin-Koo,Kai, Yoshiaki,Senou, Hiroshi Pensoft Publishers 2017 ZooKeys Vol.712 No.-
<P>Abstract</P><P>Morphological and molecular analyses were conducted on 182 specimens belonging to the <I>Hippocampuscoronatus</I> complex (<I>H.coronatus</I> sensu lato), collected in Korea and Japan 1933–2015, in order to clarify the taxonomic status of the species within this complex. Three species are recognized based on the shape of the coronet, the number of trunk rings (TrR) and tail rings (TaR), and presence or absence of a wing-tip spine (WS) at the dorsal fin base. <I>Hippocampuscoronatus</I> Temminck & Schlegel, 1850 (<I>H.coronatus</I> sensu stricto), is diagnosed by 10 TrR, 37–40 TaR, an extremely high coronet (55.7–79.0 % head length) with four tips on the corona flat (CoT), and one WS. <I>Hippocampussindonis</I> Jordan & Snyder, 1901 is diagnosed by 10 TrR, 35–38 TaR, a moderately high coronet (36.3–55.4 % HL) with five CoT, and no WS. A new species, <I>H.haema</I> is described on the basis of 140 specimens, characterized by 10 TrR, 35–38 TaR, a moderately high coronet (34.1–54.9 % head length) with four CoT, and two WS. <I>Hippocampushaema</I> is only known from the Korea Strait, western Kyushu, and East/Japan Sea. Recognition of the three species is supported by differences in mitochondrial DNA fragments (cytochrome <I>b</I>, 16S rRNA, and 12S rRNA).</P>
Microcystic Meningiomas: Its Immunohistochemical and Genetic Aspect
Koo, Sang-Keun,Han, Jin-Yeong,Kim, Su-Jin,Kim, Ki-Uk The Korean Neurosurgical Society 2006 Journal of Korean neurosurgical society Vol.39 No.2
The authors report three microcystic meningiomas with its characteristic immunohistochemical findings and chromosomal pattern. Three patients with surgically treated microcystic meningioma were studied for its radiological, histopathological findings, and chromosomal analysis was done in the one patient. Tumors were convexity meningioma in the frontal area. The tumors were enhanced homogenously in the two, and enhanced in homogenously with multiple small cysts in the other one on preoperative magenetic resonance image. Pathological examination showed marked nuclear pleomorphism, many small cysts, hyaline thickening in blood vessel wall, and mucinous background, compatable to microcystic type. EMA and vimentin were positive on the immunohistochemical stain. Chromosomal analysis showed tetrasomies of chromosome 5, 13, 17, and 20, and trisomies of chromosome 6, 7, 9, 11, 12, 16, 19, and 21, which are quite different from those of benign meningioma.