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ON RINGS IN WHICH EVERY IDEAL IS WEAKLY PRIME
Yasuyuki Hirano,Edward Poon,Hisaya Tsutsui 대한수학회 2010 대한수학회보 Vol.47 No.5
Anderson-Smith [1] studied weakly prime ideals for a commutative ring with identity. Blair-Tsutsui [2] studied the structure of a ring in which every ideal is prime. In this paper we investigate the structure of rings, not necessarily commutative, in which all ideals are weakly prime.
Magnetization Steps in Yb2Pt2Pb with the Shastry-Sutherland Lattice
Yasuyuki Shimura,Toshiro Sakakibara,Ken Iwakawa,Yoshichika Onuki,Kiyohiro Sugiyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We measured the DC magnetization of the antiferromagnet Yb2Pt2Pb (TN ~ 2.1 K) with theShastry-Sutherland lattice for two in-plane directions H k[100] and [110] down to 0.08 K. Multiplemetamagnetic transitions are found to develop in the field dependence of the magnetization M(H). Substantial anisotropy is observed in M(H) and is discussed on the basis of a two-sublattice modelwith strong Ising anisotropy along the orthogonal [110] ([1¯10]) directions recently proposed byOchiai et al.
Gerontolinguistics and Care Communication1
Yasuyuki Sugatani 대한의료커뮤니케이션학회 2008 의료커뮤니케이션 Vol.3 No.2
Gerontolinguistics is a new research area of linguistics; therefore, it is not yet settled academically. Gerontolinguistics has established five main areas so far. These five areas of Gerontolinguistics should be researched further, but at the same time, their theoretical framework should also be constructed. This research paper will clarify my idea of Gerontolinguistics from the viewpoints of micro- and macrocommunication. 2) Moreover, the possibilities of applying Gerontolinguistics to care communication.3) will be presented, and the need of applying it to providing care for older people will be explained.
Status and Prospects of OTEC Integrated with Seawater Desalination in Japan
Yasuyuki Ikegami,Sami Mutair,Takafumi Morisaki 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
Oceans cover approximately 71% of the total surface area of earth; hence oceans are considered the biggest solar collectors on earth. Most of the heat energy transferred by sunlight is absorbed by the thin layer of the ocean’s water near the surface. Below this layer, however, the temperature declines gradually with depth. Ocean Thermal Energy Conversion (OTEC) is a system that converts the temperature difference between the surface and the deep waters of the ocean into electricity. In addition, OTEC provides a clean source of fresh water by further utilization of the remaining temperature difference between the seawaters discharging from the power generation plant in driving the desalination process. This paper describes the evolution of OTEC and desalination research in Japan.
Yasuyuki Nishi,Terumi Inagaki,Yanrong Li,Ryota Omiya,Kentaro Hatano 한국유체기계학회 2014 International journal of fluid machinery and syste Vol.7 No.4
The ultimate objective of this study is to develop a water turbine appropriate for low-head open channels to effectively utilize the unused hydropower energy of rivers and agricultural waterways. The application of a cross-flow runner to open channels as an undershot water turbine has been considered and, to this end, a significant simplification was attained by removing the turbine casing. However, the flow field of an undershot cross-flow water turbine possesses free surfaces, and, as a result, the water depth around the runner changes with variation in the rotational speed such that the flow field itself is significantly altered. Thus, clear understanding of the flow fields observed with free surfaces to improve the performance of this turbine is necessary. In this study, the performance of this turbine and the flow field were evaluated through experiments and numerical analysis. The particle image velocimetry technique was used for flow measurements. The experimental results reflecting the performance of this turbine and the flow field were consistent with numerical analysis. In addition, the flow fields at the inlet and outlet regions at the first and second stages of this water turbine were clarified.
How to Generate a Secure Composite Order Ordinary Pairing-friendly Curve of Embedding Degree 3
Yasuyuki Nogami,Kazushi Nishii,Yumi Sakemi,Hidehiro Kato,Yoshitaka Morikawa 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes an efficient method for generating secure composite order ordinary pairing?friendly elliptic curves of embedding degree 3. It averagely takes about 22 minutes on Core 2 Duo (3.0㎓).