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A Study on Broadcasting / Communication System Using Highly Elliptical Orbit Satellites
Hamano, Nobuo,Yamada, Toru,Nakayama, Toshihiro,Maeda, Toshihide,Ikeda, Masahiko 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
There has been an increasing interest in world wide for the commercialization of broadcasting service using a type of satellites that are capable of providing high elevation angle characteristics over the service area. A typical example is a type of satellite in Highly Elliptical Orbit(HEO).One service provider a U.S. has already launched two of HEO satellites and they are being tested on orbit for the inauguration service in year 2001. We are also in the process of developing the system that uses HEO satellites system providing broadcasting service in Japan. In this paper an overall description of HEO satellite system is given then some of the issues and possible solutions are discussed. Finally the result of field measurement which we have carried out in Chicago using the above mentioned HEO satellite is given.
Wada Shintaro,Hagio Takeshi,Kunishi Hiroto,Park Jae-Hyeok,Phouthavong Vanpaseuth,Yamada Yuta,Terao Toshihiro,Li Xinling,Nijpanich Supinya,Ichino Ryoichi 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.6
Crystalline microporous membranes are promising tools for gas separation because their molecular dimension pores allow us to accurately sieve molecules by size. Recently, microporous hexagonal WO3 was reported as a new potential membrane material and its membrane was found to enable separation of water from water/acetic acid mixtures. Pore size of hexagonal WO3 seemed to be also suitable for separation of small gasses; however, its gas permeation properties have not been reported. Additionally, densification of membranes by decreasing intercrystalline gaps are extremely important in gas separation. One effective method to densify polycrystalline membranes is to repeat membrane synthesis, namely multi-stage synthesis. Here, we attempt to prepare dense hexagonal WO3 membranes on porous tubular supports by multi-stage synthesis and examined their densification and gas permeation properties. Densification was confirmed by permeation of SF6 (gas molecule larger than pores of hexagonal WO3), and its potential for separating small gasses was considered from single gas permeation of He and He/SF6 permselectivity. The results indicated that the multi-stage synthesis is effective to densify the membranes and He/SF6 permselectivity reached 42.8 for three-stage synthesis under modified conditions, implying hexagonal WO3 is a potential membrane material for small gas separation.
Torii, Masato,Matsuda, Yosuke,Seo, Sang Tae,Kim, Kyung Hee,Ito, Shin-Ichiro,Moon, Myung Jin,Kim, Seong Hwan,Yamada, Toshihiro The Korean Society of Mycology 2014 Mycobiology Vol.42 No.2
In Korea, mass mortality of Quercus mongolica trees has become obvious since 2004. Raffaelea quercus-mongolicae is believed to be a causal fungus contributing the mortality. To evaluate the pathogenicity of the fungus to the trees, the fungus was multiple- and single-inoculated to the seedlings and twigs of the mature trees, respectively. In both the inoculations, the fungus was reisolated from more than 50% of inoculated twigs and seedlings. In the single inoculations, proportions of the transverse area of non-conductive sapwood at inoculation points and vertical lengths of discoloration expanded from the points were significantly different between the inoculation treatment and the control. In the multiple inoculations, no mortality was confirmed among the seedlings examined. These results showed that R. quercus-mongolicae can colonize sapwood, contribute to sapwood discoloration and disrupt sap flows around inoculation sites of Q. mongolica, although the pathogenicity of the fungus was not proven.
Ischemic enteritis with intestinal stenosis
( Yorimitsu Koshikawa ),( Hiroshi Nakase ),( Minoru Matsuura ),( Takuya Yoshino ),( Yusuke Honzawa ),( Naoki Minami ),( Satoshi Yamada ),( Yumiko Yasuhara ),( Shigehiko Fujii ),( Toshihiro Kusaka ),( 대한장연구학회 2016 Intestinal Research Vol.14 No.1
A 75-year-old man was admitted to our hospital with sudden onset of vomiting and abdominal distension. The patient was taking medication for arrhythmia. Computed tomography showed stenosis of the ileum and a small bowel dilatation on the oral side from the region of stenosis. A transnasal ileus tube was placed. Enteroclysis using contrast medium revealed an approximately 6-cm afferent tubular stenosis 10 cm from the terminal ileum and thumbprinting in the proximal bowel. Transanal double-balloon enteroscopy showed a circumferential shallow ulcer with a smooth margin and edema of the surrounding mucosa. The stenosis was so extensive that we could not perform endoscopic balloon dilation therapy. During hospitalization, the patient’s nutritional status deteriorated. In response, we surgically resected the region of stenosis. Histologic examination revealed disappearance of the mucosal layer and transmural ulceration with marked fibrosis, especially in the submucosal layer. Hemosiderin staining revealed sideroferous cells in the submucosal layers. Based on the pathologic findings, the patient was diagnosed with ischemic enteritis. The patient’s postoperative course was uneventful. (Intest Res 2016;14:89-95)
( Masato Torii ),( Yosuke Matsuda ),( Sang Tae Seo ),( Kyung Hee Kim ),( Shin Ichiro Ito ),( Myung Jin Moon ),( Seong Hwan Kim ),( Toshihiro Yamada ) 한국균학회 2014 韓國菌學會誌 Vol.42 No.2
In Korea, mass mortality of Quercus mongolica trees has become obvious since 2004. Raffaelea quercus-mongolicae is believed to be a causal fungus contributing the mortality. To evaluate the pathogenicity of the fungus to the trees, the fungus was multiple- and single-inoculated to the seedlings and twigs of the mature trees, respectively. In both the inoculations, the fungus was reisolated from more than 50% of inoculated twigs and seedlings. In the single inoculations, proportions of the transverse area of non-conductive sapwood at inoculation points and vertical lengths of discoloration expanded from the points were significantly different between the inoculation treatment and the control. In the multiple inoculations, no mortality was confirmed among the seedlings examined. These results showed that R. quercus-mongolicae can colonize sapwood, contribute to sapwood discoloration and disrupt sap flows around inoculation sites of Q. mongolica, although the pathogenicity of the fungus was not proven.