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Nagatsuka, H,Murata, M,Shin, H.I,Choi, K.S,Nagai, N 경북대학교 의학연구소 1999 경북대학교병원의학연구소논문집 Vol.3 No.1
Verruciform xanthoma is an uncommon beniㅎn lesion of unknown aetiology and pathogenesis. Two cases of verruciform xanthoma are presented together with an immunohistochemical and ultra-structural study. One case co-occurred with an odontogenic keratocyst which, to our knowledge, has not been previously reported and another case occurred on masticatory mucosa with an asympto-matic, granular exophytic lesion causing a cleft-like gingival recession. In an immunohistochemical study using antibodies to macrophage (CD 68[KP1]), alpha-1-antitrypsin, vimentin, desmin, keratin, neuron-specific enolase (NSE) and S-100 protein, the characteristic foam cells of verruciform xanthoma showed strong positive staining far CD 68[KPl] and vimentin and weak positive staining for a1pha-1-antitrypsin, while the other antibodies were negative. As in previous studies, S-100 protein positive dendritic cells were detected in lesional connective tissue. In addition, the ultrastructural findings revealed characteristics of macrophages containing varying sized lipid vacuoles and degen-erating epithelial cells. These findings suppotr the concepts that the foam cells in verruciform xan-thoma are of monocyte-macrophage lineage and that the epithelial degeneration from uncertain causes may be related to the pathogenesis of the lesion. ⓒ1997 Elsevier Science Ltd
CHO, S-Y.,NAGAI, S.,NISHITANI, G.,HAN, M-S. Blackwell Publishing Ltd 2009 Molecular ecology resources Vol.9 No.3
<P>Abstract</P><P>We isolated 13 polymorphic microsatellites from the red-tide causing dinoflagellate <I>Akashiwo sanguinea</I>. These loci were highly variable, with between 2 and 10 alleles per locus, and estimated gene diversity ranging from 0.08 to 0.82. These loci have the potential to reveal genetic structure and estimate gene flow among <I>A. sanguinea</I> populations.</P>
SAWADA-SATOH, S.,AKIYAMA, K.,NIINUMA, K.,NAGAI, H.,KINO, M.,D'AMMANDO, F.,KOYAMA, S.,HADA, K.,ORIENTI, M.,HONMA, M.,SHIBATA, K.M. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We present a kinematic study of the parsec-scale radio jet in OJ 287, one of the most studied BL Lac objects, during ${\gamma}$-ray flares, to explore the relation between parsec-scale radio jet activity and ${\gamma}$-ray emission. The 22-GHz light curve of OJ 287 show three obvious flare events around 2011 May, 2011 October, and 2012 March. The second radio flare occurred during the ${\gamma}$-ray flaring period, and the third radio flare seemed to precede the ${\gamma}$-ray flare by one month. One jet component moved outward with respect to the core component with an apparent superluminal speed (~ 11c) from 2010 November to 2011 November. Then it changed direction, moving apparently inward in 2011 November, when the ${\gamma}$-ray flare occurred. The observed apparent inward motion of the jet at 22 GHz could be caused by a new jet component, unresolved at 22 GHz, in the innermost region.
Akiyama, Kazunori,Lu, Ru-Sen,Fish, Vincent L.,Doeleman, Sheperd S.,Broderick, Avery E.,Dexter, Jason,Hada, Kazuhiro,Kino, Motoki,Nagai, Hiroshi,Honma, Mareki,Johnson, Michael D.,Algaba, Juan C.,Asada, IOP Publishing 2015 The Astrophysical journal Vol.807 No.2
<P>We report on 230 GHz (1.3 mm) very long baseline interferometry (VLBI) observations of M87 with the Event Horizon Telescope using antennas on Mauna Kea in Hawaii, Mt. Graham in Arizona, and Cedar Flat in California. For the first time, we have acquired 230 GHz VLBI interferometric phase information on M87 through measurement of the closure phase on the triangle of long baselines. Most of the measured closure phases are consistent with 0 degrees as expected by physically motivated models for 230 GHz structure such as jet models and accretion disk models. The brightness temperature of the event-horizon-scale structure is similar to 1 x 10(10) K derived from the compact flux density of similar to 1 Jy and the angular size of similar to 40 mu as similar to 5.5 R-s, which is broadly consistent with the peak brightness of the radio cores at 1-86 GHz located within similar to 10(2) R-s. Our observations occurred in the middle of an enhancement in very-high-energy (VHE) gamma-ray flux, presumably originating in the vicinity of the central black hole. Our measurements, combined with results of multi-wavelength observations, favor a scenario in which the VHE region has an extended size of similar to 20-60 R-s.</P>
Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI
Koyama, S.,Kino, M.,Giroletti, M.,Doi, A.,Giovannini, G.,Orienti, M.,Hada, K.,Ros, E.,Niinuma, K.,Nagai, H.,Savolainen, T.,Krichbaum, T. P.,Pé,rez-Torres, M. Á,. Springer-Verlag 2016 Astronomy and astrophysics Vol.586 No.-
ZVS-PWM Boost Chopper-Fed DC-DC Converter with Load-Side Auxiliary Edge Resonant Snubber
K.Ogura,S.Chandhaket,S.Nagai,T.Ahmed,M.Nakaoka 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper presents a high-frequency ZVS-PWM boost chopper-fed DC-DC converter with a single active auxiliary edge-resonant snubber which is used for power conditioner such as solar photovoltaic generation and fuel cell generation The experimental results of boost chopper fed ZVS-PWM DC-DC converter are evaluated in addition to Its switching voltage and current waveforms, and the switching V-I trajectory of the power devices are discussed and compared with the conventional hard switching DC-DC converter treated here The temperature performance of IGBT module, efficiency, and EMI noise characteristics of this ZVS-PWM DC-DC converter using IGBTs are measured and evaluated from an experimental point of view
Analysis on Surge Voltage in Inverter-fed Motor Using Frequency Response Analysis
M. Fujieda,Y. Takahashi,N. Kimura,T. Wakimoto,S. Nagai,N. Koshino,K. Takizawa 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, distribution of voltages between coils in inverter-fed motor and its mechanism are discussed. Insulation reliability of inverter-fed motor is one of major problems in HEV application. To ensure the reliability of insulation, enough thickness of insulation layer of coil-wire is desired to avoid partial discharge in air gap between coilwires, though the voltages between coils changes complexly due to its high frequency response. To analyze distribution of the voltages between coils, the simultaneous measurements of the voltages in various points in motor were performed. In addition, frequency response analyses of the voltages between coils were performed to understand its high frequency response. From these measurements and analysis , the fact that the LC-resonance between coil inductance and its stray capacitance causes surge voltage in motor is revealed.
DISCOVERY OF A WANDERING RADIO JET BASE AFTER A LARGE X-RAY FLARE IN THE BLAZAR MARKARIAN 421
Niinuma, K.,Kino, M.,Doi, A.,Hada, K.,Nagai, H.,Koyama, S. IOP Publishing 2015 ASTROPHYSICAL JOURNAL LETTERS - Vol.807 No.1
<P>We investigate the location of the radio jet bases ('radio cores') of blazars in radio images and their stationarity by means of dense very long baseline interferometry (VLBI) observations. In order to measure the position of a radio core, we conducted a 12 epoch astrometric observation of the blazar Markarian 421 with the VLBI Exploration of Radio Astrometry at 22 GHz immediately after a large X-ray flare, which occurred in the middle of 2011 September. For the first time, we find that the radio core is not stationary but rather changes its location toward 0.5 mas downstream. This angular scale corresponds to the de-projected length of a scale of 10(5) Schwarzschild radii (R-s) at the distance of Markarian 421. This radio-core wandering may be a new type of manifestation associated with the phenomena of large X-ray flares.</P>