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High Power Lasers and Their New Applications
Yasukazu Izawa,Noriaki Miyanaga,Junji Kawanaka,Koichi Yamakawa 한국광학회 2008 Current Optics and Photonics Vol.12 No.3
Recent progress in high power lasers enables us to access a regime of high-energy-density and/or ultra-strong fields that was not accessible before, opening up a fundamentally new physical domain which includes laboratory astrophysics and laser nuclear physics. In this article, new applications of high-energy and ultra-intense laser will be reviewed.
An Extension of glTF for Robot Description
Ryoya Izawa,Masanobu Koga 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In this paper, we propose a new 3D file format RDTF, which is compatible with glTF and can be used for robots simulation. Since RDTF is an extension of glTF, RDTF file can be used with tools that support glTF. It is worth mentioning that there are many existing glTF models[3] which can be transformed to RDTF.
Social capital and international trade: evidence from Japanese firms
( Toshiyasu Izawa ) 한국국제경제학회 2015 한국국제경제학회 동계학술대회 Vol.2015 No.-
Social capital/network VIews of firm activities have been widely discussed m recent economic studies. In this context social capital is generally interpreted as inter-firm transaction networks, norms, and trust that facilitate coordination and cooperation for mutual benefit. This paper examines how social network of firms, especially transaction network, affect their sales and exporting activities by utilizing Japanese corporate data. We find that strength of network has a significant role on sales and trade of firms. Closer ties of transaction network among firms enhance exports of firms. This indicates that social network likely work on extending firms`` activities in foreign market even if they are less productive. The result is consistent with recent studies in the context of the analysis in heterogeneity of firms.
오대현,Shusaku Moteki,Masako Izawa 한국생태학회 2010 Journal of Ecology and Environment Vol.33 No.1
The Tsushima leopard cat, Prionailurus bengalensis euptilurus, a small felid, inhabits only the Tsushima Islands in Japan. Previous studies of the Tsushima leopard cat revealed that natural factors; including sex, reproductive activity,season, and prey distribution and abundance affect leopard cat home range variation and habitat use. In this study, we focused on clarifying how anthropogenic factors influenced home range variation and habitat use of a male Tsushima leopard cat living near a suburban area in January, March, May and September 2005 using radio-tracking. The home range size (100% MCP) of this cat was 0.78 ± 0.26 ㎢ (mean ± SD, n = 4 tracking sessions) across the whole study period. However, the cat did not use all parts of its home range uniformly; rather it used some habitat types selectively. The cat avoided agriculture areas and residential areas in all of the tracking-sessions. On the other hand, the cat showed a weak preference for artificial structures and a strong preference for baiting sites in January and March, while it avoided them in May, and no baiting site was included in its home range in September. These results suggest that anthropogenic factors influenced the ranging patterns and habitat use of the leopard cat living near a suburban area. Artificial structures might provided good resting spaces for the cat in bad weather. When the density of its main prey was low in the winter, the cat tended to rely on artificial prey and had a small home range size.
Oh, Dae-Hyun,Moteki, Shusaku,Nakanish, Nozomi,Izawa, Masako The Ecological Society of Korea 2010 Journal of Ecology and Environment Vol.33 No.1
The Tsushima leopard cat, Prionailurus bengalensis euptilurus, a small felid, inhabits only the Tsushima Islands in Japan. Previous studies of the Tsushima leopard cat revealed that natural factors; including sex, reproductive activity, season, and prey distribution and abundance affect leopard cat home range variation and habitat use. In this study, we focused on clarifying how anthropogenic factors influenced home range variation and habitat use of a male Tsushima leopard cat living near a suburban area in January, March, May and September 2005 using radio-tracking. The home range size (100% MCP) of this cat was $0.78\;{\pm}\;0.26\;km^2$ (mean ${\pm}$ SD, n = 4 tracking sessions) across the whole study period. However, the cat did not use all parts of its home range uniformly; rather it used some habitat types selectively. The cat avoided agriculture areas and residential areas in all of the tracking-sessions. On the other hand, the cat showed a weak preference for artificial structures and a strong preference for baiting sites in January and March, while it avoided them in May, and no baiting site was included in its home range in September. These results suggest that anthropogenic factors influenced the ranging patterns and habitat use of the leopard cat living near a suburban area. Artificial structures might provided good resting spaces for the cat in bad weather. When the density of its main prey was low in the winter, the cat tended to rely on artificial prey and had a small home range size.