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Probing the precise location of the radio core in the TeV blazar Mrk 501 with VERA at 43 GHz
Koyama, Shoko,Kino, Motoki,Doi, Akihiro,Niinuma, Kotaro,Hada, Kazuhiro,Nagai, Hiroshi,Honma, Mareki,Akiyama, Kazunori,Giroletti, Marcello,Giovannini, Gabriele,Orienti, Monica,Isobe, Naoki,Kataoka, Jun Astronomical Society of Japan 2015 Publications of the Astronomical Society of Japan Vol.67 No.4
Development of novel cascade type crystallizer for continuous production of crystalline particles
Mana Koyama,Shoji Kudo,Shuntaro Amari,Hiroshi Takiyama 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
The introduction of a continuous crystallization process has been attracting attention for thepharmaceutical products. We designed a novel continuous crystallizer, which includes Couette–Taylorequipment integrated with MSMPR equipment in a cascading manner. Additionally, feed solutions weresupplied to MSMPR and Couette–Taylor equipment toflexibly control the supersaturation of the MSMPRequipment, regardless of the supersaturation of Couette–Taylor equipment. In this study, the relationshipbetween operating parameters in novel cascade–type crystallizer andfinal crystal quality wasinvestigated. We found that the quality of the obtained crystalline particles depend on theflow-rate ratioof the feed solution supplied to Couette–Taylor equipment. Furthermore, the yield of crystalline productswas improved using proposed crystallizer. Therefore, we expect proposed novel cascade–typecrystallizer consisting of Couette–Taylor and MSMPR equipment to obtain crystalline products withvarious quality.
R & D of Global Multimedia Mobile Satellite Communications on NeLS Project
Ohkawa, Mitsugu,Koyama, Yoshisada,Motoyoshi, Shigeru,Watanabe, Hiroshi,Morikawa, Eihisa,Suzuki, Ryutaro,Yasuda, Yasuhiko 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Next-generation LEO System Research Center (NeLS) has carried out the key technology development of global multimedia mobile satellite communications. In Phase I we studied the system definition and developed key technologies such as on-board active phased array antenna with digital beam forming, optical antenna, optical modem, wavelength division multiplexing for optical inter-satellite link system, satellite network, and variable rate modulation. In Phase 2, we plan to verify the developed technology in Phase 1 on space. In this paper, we introduce the results of development in Phase 1.
Immobilization of π-conjugated molecules on Au using dendrimer-based templates
Hideo Tokuhisa,Emiko Koyama,Abdelhak Belaissaoui,Hiroshi Suga,Takao Ishida,Yasushiro Nishioka,Masatoshi Kanesato 한국물리학회 2006 Current Applied Physics Vol.6 No.4
In this paper, we demonstrate immobilization of two kinds of p-conjugated molecules on Au using dendrimer-based templates; one is a p-phenylene ethynylene derivative and the other is a 4,40-bis(phenylethynyl)-2,20-bipyridine derivative. Both molecules were bound to benzyl-ether dendrons through an alkali-labile, ester linkage to give two different generation dendrimers. The removal of the dendrons from the self-assembled monolayers of the dendrimers left the isolated p-conjugated-molecules as well as small collections of the molecules on the surfaces, which was confirmed by surface Fourier transform infrared (FT-IR) spectroscopy and scanning tunneling microscopy (STM). Insertion of the dendrimer into n-dodecanethiol monolayer instead of the direct adsorption on a bare gold gave only the isolated, single molecules on the surface after the dendrons were removed.
Ohno, Yoshiharu,Iwasawa, Tae,Seo, Joom Beom,Koyama, Hisanobu,Takahashi, Hiroshi,Oh, Yeon-Mok,Nishimura, Yoshihiro,Sugimura, Kazuro American Thoracic Society 2008 American journal of respiratory and critical care Vol.177 No.10
<P>RATIONALE: Oxygen-enhanced magnetic resonance imaging (MRI) has been proposed as a useful tool for assessing regional morphological and functional changes in chronic obstructive pulmonary disease (COPD). OBJECTIVES: To prospectively and directly compare the efficacy of O(2)-enhanced MRI and quantitative computed tomography (CT) for smoking-related pulmonary functional loss assessment and clinical stage classification of smoking-related COPD. METHODS: One hundred sixty smokers were classified into four age- and gender-matched groups by using the GOLD criteria for smokers: Smokers without COPD (n = 40), Mild COPD (n = 40), Moderate COPD (n = 40), and Severe or Very Severe COPD (n = 40). All smokers underwent O(2)-enhanced MRI, multidetector-row CT, and pulmonary function test. Mean relative enhancement ratio on O(2)-enhanced MRI and CT-based functional lung volume (FLV) on quantitative CT were calculated. To compare the efficacy of O(2)-enhanced MRI and quantitative CT for pulmonary functional loss assessment, both indexes were correlated with pulmonary functional parameters. To determine the efficacy of two methods for clinical stage classification, the four clinical groups' mean relative enhancement ratio and CT-based FLV were statistically compared. MEASUREMENTS AND MAIN RESULTS: Correlations of both indexes with pulmonary functional parameters were significant (P < 0.0001). Pulmonary functional parameters and mean relative enhancement ratio for the four clinical groups showed significant differences (P < 0.05). CT-based FLVs of smokers without COPD and mild COPD were significantly different from those for moderate COPD and severe or very severe COPD (P < 0.05). CONCLUSIONS: O(2)-enhanced MRI is effective for pulmonary functional loss assessment and clinical stage classification of smoking-related COPD and quantitative CT.</P>
Role of Breast Tomosynthesis in Diagnosis of Breast Cancer for Japanese Women
Takamoto, Yayoi,Tsunoda, Hiroko,Kikuchi, Mari,Hayashi, Naoki,Honda, Satoshi,Koyama, Tomomi,Ohde, Sachiko,Yagata, Hiroshi,Yoshida, Atsushi,Yamauchi, Hideko Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Introduction: Mammography is the most basic modality in breast cancer imaging. However, the overlap of breast tissue depicted on conventional two-dimensional mammography (2DMMG) may create significant obstacles to detecting abnormalities, especially in dense or heterogeneously dense breasts. In three-dimensional digital breast tomosynthesis (3DBT), tomographic images of the breast are reconstructed from multiple projections acquired at different angles. It has reported that this technology allows the generation of 3D data, therefore overcoming the limitations of conventional 2DMMG for Western women. We assessed the detectability of lesions by conventional 2DMMG and 3DBT in diagnosis of breast cancer for Japanese women. Methods: The subjects were 195 breasts of 99 patients (median age of 48 years, range 34~82 years) that had been pathologically diagnosed with breast cancer from December 20, 2010 through March 31, 2011. Both conventional 2DMMG and 3DBT imaging were performed for all patients. Detectability of lesions was assessed based on differences in category class. Results: Of the affected breasts, 77 (75.5%) had lesions assigned to the same categories by 2DMMG and 3DBT. For 24 (23.5%) lesions, the category increased in 3DBT indicating improvement in diagnostic performance compared to 2DMMG. 3DBT improved diagnostic sensitivity for patients with mass, focal asymmetric density (FAD), and architectural distortion. However, 3DBT was not statistically superior in diagnosis of the presence or absence of calcification. Conclusions: In this study, 3DBT was superior in diagnosing lesions in form of mass, FAD, and/or architectural distortion. 3DBT is a novel technique that may provide a breakthrough in solving the difficulties of diagnosis caused by parenchyma overlap for Japanese women.
Yasuda Tatsuya,Togawa Daisuke,Hasegawa Tomohiko,Yamato Yu,Kobayashi Sho,Yoshida Go,Banno Tomohiro,Arima Hideyuki,Oe Shin,Hoshino Hironobu,Koyama Hiroshi,Hanada Mitsuru,Imada Takayuki,Matsuyama Yukihir 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.4
Study Design: Large cohort study of volunteers.Purpose: The purpose of this study was to investigate the relationship between the severity of knee osteoarthritis, assessed using the Kellgren-Lawrence (KL) grading scale, and spinopelvic sagittal alignment in older adult volunteers.Overview of Literature: The relationship between spinopelvic alignment in the sagittal plane and knee osteoarthritis in the coronal plane is unclear.Methods: Volunteers over 50 years of age underwent radiographic analysis. Radiographic parameters including pelvic tilt (PT), pelvic incidence (PI), lumbar lordosis (LL), thoracic kyphosis, and sagittal vertical axis (SVA) were measured. The the three Scoliosis Research Society-Schwab sagittal modifiers (PT, SVA, I–LL) were categorized and the KL grade was assessed. Differences in spinopelvic parameters and Oswestry Disability Index (ODI) scores among KL grades were evaluated.Results: A total of 396 volunteers (160 men, 236 women; mean age, 74.4 years) were analyzed. PI–LL and PT in KL4 were significantly higher compared to that in the other KL grades. However, there were no significant group differences in SVA. In women, but not in men, higher frequencies of the worst modifier grade (++) were observed for PI–LL and PT in the KL3 and KL4 groups compared to those for the other KL grades. In women, the ODI score in KL4 was worse compared to that in the other KL grades.Conclusions: Individuals over 50 years of age with severe knee osteoarthritis had poor lumbo-pelvic sagittal alignment. Moreover, the progression severity of knee osteoarthritis had more impact onstronger relationship with lumbo-pelvic malalignment and disability-related low back pain in women than in men.