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Search Results: 1 - 10 of 187 matches for " Ohara "
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Geometric study for the Legendre duality of generalized entropies and its application to the porous medium equation
Atsumi Ohara
Physics , 2009, DOI: 10.1140/epjb/e2009-00170-y
Abstract: We geometrically study the Legendre duality relation that plays an important role in statistical physics with the standard or generalized entropies. For this purpose, we introduce dualistic structure defined by information geometry, and discuss concepts arising in generalized thermostatistics, such as relative entropies, escort distributions and modified expectations. Further, a possible generalization of these concepts in a certain direction is also considered. Finally, as an application of such a geometric viewpoint, we briefly demonstrate several new results on a behavior of the solution to the nonlinear diffusion equation called the {\em porous medium equation}.
Algebraic K-theory of projective modules over spectral affine schemes and the representation
Mariko Ohara
Mathematics , 2014,
Abstract: Recently, the $\mathcal{G}$-structured $\infty$-topoi and the concept of the spectral schemes are developed by Lurie in his textbook and papers. In this paper, we study K-theory of spectral schemes by using quasi-coherent sheaves. When we regard the K-theory as a functor $K$ on the affine spectral schemes, we prove that the group completion $\Omega B (BGL)$ represents the sheafification of $K$ with respect to Zariski (resp. Nisnevich) topology, where we define $BGL$ by a classifying space of a colimit of affine spectral scheme $GL_n$. It gives a generalization of the consequence of Elmendorf-Kriz-Mandell-May to the algebraic K-theory sheaf in certain $\infty$-topos. We also prove the theorem of heart for the K-theory for finitely generated projective modules which has only finitely many non-zero homotopy groups.
Activity of Salivary 11β-Hydroxysteroid Dehydrogenase Type 2 Becomes the Index for the Continuous Strength Exercise to Prevent Locomotive Syndrome in Japan  [PDF]
Noboru Hasegawa, Maki Ohara, Miyako Mochizuki
Health (Health) , 2015, DOI: 10.4236/health.2015.710149
Abstract: The Japanese Orthopedic Association proposed a concept called locomotive syndrome (LS) to identify middle-aged and older adults at high risk of requiring health care services because of problems with locomotion-associated lower muscle mass. To prevent LS, it is important to increase muscle mass and muscle strength in middle-age by continuous resistance training. A total of 38 men and women were assessed at baseline and 6 months. Body composition, physical strength and salivary cortisol and cortisone were analyzed. The exercise intervention program was performed by individual muscle endurance level. Body weight, muscle weight and basal metabolism were increased after exercise intervention. The 30-second sit-up test and 3-minute walking were increased, and the 10-time sit-to-stand was decreased significantly. This may be related to increase of leg and abdominal muscular strength. The exercise intervention program increased salivary 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2) activities significantly. These results suggested that 11β-HDS2 became the index for the increase of muscular strength to prevent LS.
Ponotus shirahamensis, a new genus and species of raninid crab (Decapoda, Brachyura) from the Miocene Tanabe Group of Japan
Karasawa, Hiroaki;Ohara, Masaaki;
Boletín de la Sociedad Geológica Mexicana , 2009,
Abstract: ponotus shirahamensis, a new genus and species of the crab family raninidae (decapoda: brachyura) is described from the lowermost middle miocene tanabe group in wakayama prefecture of central japan. ponotus shirahamensis represents the second record for the family raninidae from the miocene deposits of japan. ponotus is most similar to notopus, an extant monotypic genus of the notopodinae, but is characterized by the absence of a spinose transverse ridge between the hepatic spines on the dorsal carapace.
Development of a ground displacement measurement method for failed slopes at the toes of landslides
K. Fujisawa ,J. Ohara
Advances in Geosciences (ADGEO) , 2008,
Abstract: Effective countermeasures and risk management to reduce landslide hazards require a full understanding of the processes of collapsing landslides. While the processes are generally estimated from the features of debris deposits after collapse, simultaneous monitoring during collapse provides more insights into the processes. Such monitoring, however, is usually very difficult, because it is rarely possible to predict when a collapse will occur. This study introduces a rare case in which a collapsing landslide (150 m in width and 135 m in height) was filmed with three video cameras in Higashi-Yokoyama, Gifu Prefecture, Japan. The cameras were set up in the front and on the right and left sides of the slide in May 2006, one month after a series of small slope failures in the toe and the formation of cracks on the head indicated that a collapse was imminent. The filmed images showed that the landslide collapse started from rock falls and slope failures occurring mainly around the margin, that is, the head, sides and toe. These rock falls and slope failures, which were individually counted on the screen, increased with time. Analyzing the images, five of the failures were estimated to have each produced more than 1000 m3 of debris, and the landslide collapsed with several surface failures accompanied by a toppling movement. The manner of the collapse suggested that the slip surface initially remained on the upper slope, and then extended down the slope as the excessive internal stress shifted downwards. Image analysis, together with field measurements using a ground-based laser scanner after the collapse, indicated that the landslide produced a total of 50 000 m3 of debris. As described above, simultaneous monitoring provides valuable information about landslide processes. Further development of monitoring techniques will help clarify landslide processes qualitatively as well as quantitatively.
Theoretical implication of reversals of the ozone weekend effect systematically observed in Japan
A. Kannari,T. Ohara
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: Systematic changes of the ozone weekend effect are found over broad areas of Japan. These changes are characterized by (1) spatial reversals from a weekend increase in the vicinity of huge precursor source areas to a weekend decrease in the surrounding rural areas, and (2) temporal reversals from a weekend increase under relatively unsuitable meteorological conditions for ozone formation to a weekend decrease under relatively suitable conditions. We developed a simple numerical advection–reaction model to explain the relationship between the duration of advection and the supplied solar energy, which causes the daily maximum ozone concentration to be lower near the precursor source. Ozone isopleth diagrams for individual advection durations (equivalent to the distance from the source) for a wide range of initial precursor conditions show that both VOC-limited and NOx-limited regimes exist for each advection duration, but the area of NOx-limited regime becomes dominant as the advection duration increases because of the increased exposure of the air mass to solar energy. For given initial VOC and NOx concentrations, the area remote from the source becomes a NOx-limited regime even if the precursor source area is in the VOC-limited regime. The rate of reduction of weekend emissions of NOx is larger than that of VOC, causing a weekend increase in ozone inside an area of VOC-limited regime near the source, but a weekend decrease in remote areas with a NOx-limited regime. The boundary between these two ozone formation regimes depends on meteorological conditions: when sunlight intensity and temperature are relatively low, the change from a VOC-limited to a NOx-limited regime occurs at a point more remote from the source than when they are relatively high, which causes a prevailing ozone weekend increase over a wide geographical area on days with lower ozone potential. Therefore, observations of ozone weekend changes can be interpreted in light of the theoretical implications of our model; they can be used for determination of ozone formation regimes, which change in different locations and under different meteorological conditions.
Theoretical implication of reversals of the ozone weekend effect systematically observed in Japan
A. Kannari,T. Ohara
Atmospheric Chemistry and Physics Discussions , 2009,
Abstract: Systematic changes of the ozone weekend effect are found over broad areas of Japan. These changes are characterized by (1) spatial reversals from a weekend increase in the vicinity of huge precursor source areas to a weekend decrease in the surrounding rural areas, and (2) temporal reversals from a weekend increase under relatively unsuitable meteorological conditions for ozone formation to a weekend decrease under relatively suitable conditions. We developed a simple numerical advection-reaction model to explain the relationship between the duration of advection and the supplied solar energy, which causes the daily maximum ozone concentration to be lower near the precursor source. Ozone isopleth diagrams for individual advection durations (equivalent to the distance from the source) for a wide range of initial precursor conditions show that both VOC-limited and NOx-limited regimes exist for each advection duration, but the area of NOx-limited regime becomes dominant as the advection duration increases because of the increased exposure of the air mass to solar energy. For given initial VOC and NOx concentrations, the area remote from the source becomes a NOx-limited regime even if the precursor source area is in the VOC-limited regime. The rate of reduction of weekend emissions of NOx is larger than that of VOC, causing a weekend increase in a VOC-limited regime near the source, but a weekend decrease in remote areas with a NOx-limited regime. The boundary between these two ozone formation regimes depends on meteorological conditions: when sunlight intensity and temperature are relatively low, the change from a VOC-limited to a NOx-limited regime occurs at a point more remote from the source than when they are relatively high, which causes a prevailing ozone weekend increase over a wide geographical area on days with lower ozone potential. Therefore, observations of ozone weekend changes can be interpreted in light of the theoretical implications of our model; they can be used for determination of ozone formation regimes, which change in different locations and under different meteorological conditions.
Performance Comparison for Resource Allocation Schemes using Cost Information in Cloud
Takahiro KOITA,Kosuke OHARA
International Journal on Computer Science and Engineering , 2012,
Abstract: A wide variety of different types of virtual computer are available in cloud computing, each with different usage costs for processing performance and time. Consequently, similar processing tasks canincur different processing times and processing costs depending on the choice of method used to accomplish them. Since the amounts of time and money that can be spent on processing are not infinite, theprocessing time and usage costs must be reduced as much as possible. In this study, we investigate the allocation of resources in a cloud computing environment with the aim of achieving lower processingtimes and usage costs.
Group Invariance of Information Geometry on q-Gaussian Distributions Induced by Beta-Divergence
Atsumi Ohara,Shinto Eguchi
Entropy , 2013, DOI: 10.3390/e15114732
Abstract: We demonstrate that the q-exponential family particularly admits natural geometrical structures among deformed exponential families. The property is the invariance of structures with respect to a general linear group, which transitively acts on the space of positive definite matrices. We prove this property via the correspondence between information geometry induced by a deformed potential on the space and the one induced by what we call β-divergence defined on the q-exponential family with q = β + 1. The results are fundamental in robust multivariate analysis using the q-Gaussian family.
Competing Ground States of a Peierls-Hubbard Nanotube
Jun Ohara,Shoji Yamamoto
Physics , 2009,
Abstract: Motivated by iodo platinum complexes assembled within a quadratic-prism lattice, [Pt(C$_2$H$_8$N$_2$)(C$_{10}$H$_8$N$_2$)I]$_4$(NO$_3$)$_8$, we investigate the ground-state properties of a Peierls-Hubbard four-legged tube. Making a group-theoretical analysis, we systematically reveal a variety of valence arrangements, including half-metallic charge-density-wave states. Quantum and thermal phase competition is numerically demonstrated with particular emphasis on doping-induced successive insulator-to-metal transitions with conductivity increasing stepwise.
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