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Search Results: 1 - 10 of 272 matches for " Masayoshi; "
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A User Proprietary Obfuscate System for Positions Sharing in Location-Aware Social Networks  [PDF]
Wei Cherng Cheng, Masayoshi Aritsugi
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.35002

A user’s trajectory can be maliciously monitored by adversaries when they share the positions in location-aware social networking applications which require users to update their own locations continuously. An adversary infers user’s locations from the trajectories, and gleans user’s private information through them via location-aware social networking applications and public available geographic data. In this paper, we propose a user proprietary obfuscate system to suit situations for position sharing and location privacy preserving in location-aware social network. Users transform the public available geographic data into personal obfuscate region maps with pre-defined profile to prevent the location leaking in stationary status. Our obfuscation with size restricted regions method tunes user’s transformed locations fitting into natural movement and prevents unreasonable snapshot locations been recorded in the trajectory.

Role of carotenoid β-cryptoxanthin in bone homeostasis
Masayoshi Yamaguchi
Journal of Biomedical Science , 2012, DOI: 10.1186/1423-0127-19-36
Abstract: Bone is a dynamic tissue that preserves skeletal size, shape, and structural integrity and to regulate mineral homeostasis. Bone homeostasis is maintained through a balance between osteoblastic bone formation and osteoclastic bone resorption. Aging and numerous pathological processes induce decrease in bone formation and increase in bone resorption, leading to osteoporosis, a devastating bone disease [1]. Osteoporosis, which is induced with decrease in bone mass, is widely recognized as a major public health problem [1]. The most dramatic expression of the disease is represented by fractures of the proximal femur for which the number increases as the population ages [2].Nutritional factors may have the potential effect to prevent bone loss with increasing age. There is growing evidence that the supplementation of nutritional and food factors may have the preventive effect on bone loss that is induced in animal model of osteoporosis and in human subjects [3-6]. Chemical compounds in food and plants, which regulate on bone homeostasis, have been to be worthy of notice in maintaining of bone health and prevention of bone loss with increasing age [7-13].Carotenoids (carotene and xanthophyll) are present in fruit and vegetables. Carotenoids, which are a provitamin A, may have an anabolic effect on bone metabolism. Vitamin A (retinol, retinal, and retinoic acid), which is formed from carotenoids in animal and human, has been shown to have a role in the regulation of bone cells and it may have an anabolic effect on bone [14-16]. However, vitamin A is also known to have a detrimental effect on bone at high doses [17-20]. In laboratory animals, high levels of vitamin A lead to accelerated bone resorption, bone fractures, and osteoporotic bone lesions [17].Beta (β)-cryptoxanthin, a kind of xanthophyll, is abundant in Satsuma mandarin orange (Citrus unshiu MARC.). Of various carotenoids, β-cryptoxanthin has been found to have a potential-anabolic effect on bone due to stimulat
Biological implications of coeruleospinal inhibition of nociceptive processing in the spinal cord
Masayoshi Tsuruoka
Frontiers in Integrative Neuroscience , 2012, DOI: 10.3389/fnint.2012.00087
Abstract: The coeruleospinal inhibitory pathway (CSIP), the descending pathway from the nucleus locus coeruleus (LC) and the nucleus subcoeruleus (SC), is one of the centrifugal pain control systems. This review answers two questions regarding the role coeruleospinal inhibition plays in the mammalian brain. First is related to an abnormal pain state, such as inflammation. Peripheral inflammation activated the CSIP, and activation of this pathway resulted in a decrease in the extent of the development of inflammatory hyperalgesia. During inflammation, the responses of the dorsal horn neurons to graded heat stimuli in the LC/SC-lesioned rats did not produce a further increase with the increase of stimulus intensity in the higher range temperatures. These results suggest that the function of CSIP is to maintain the accuracy of intensity coding in the dorsal horn because the plateauing of the heat-evoked response in the LC/SC-lesioned rats during inflammation is due to a response saturation that results from the lack of coeruleospinal inhibition. The second concerns attention and vigilance. During freezing behavior induced by air-puff stimulation, nociceptive signals were inhibited by the CSIP. The result implies that the CSIP suppresses pain system to extract other sensory information that is essential for circumstantial judgment.
Capturing the Two Dimensions of Residential Segregation at the Neighborhood Level for Health Research
Masayoshi Oka
Frontiers in Public Health , 2014, DOI: 10.3389/fpubh.2014.00118
Abstract: Two conceptual and methodological foundations of segregation studies are that (i) segregation involves more than one group, and (ii) segregation measures need to quantify how different population groups are distributed across space. Therefore, percentage of population belonging to a group is not an appropriate measure of segregation because it does not describe how populations are spread across different areal units or neighborhoods. In principle, evenness and isolation are the two distinct dimensions of segregation that capture the spatial patterns of population groups. To portray people’s daily environment more accurately, segregation measures need to account for the spatial relationships between areal units and to reflect the situations at the neighborhood scale. For these reasons, the use of local spatial entropy-based diversity index (SHi) and local spatial isolation index (Si) to capture the evenness and isolation dimensions of segregation, respectively, are preferable. However, these two local spatial segregation indexes have rarely been incorporated into health research. Rather ineffective and insufficient segregation measures have been used in previous studies. Hence, this paper empirically demonstrates how the two measures can reflect the two distinct dimensions of segregation at the neighborhood level, and argues conceptually and set the stage for their future use to effectively and meaningfully examine the relationships between residential segregation and health.
Concentration of measure via approximated Brunn--Minkowski inequalities
Masayoshi Watanabe
Mathematics , 2008,
Abstract: We prove that an approximated version of the Brunn--Minkowski inequality with volume distortion coefficient implies a Gaussian concentration-of-measure phenomenon. Our main theorem is applicable to discrete spaces.
Two remarks on the Collatz cycle conjecture
Masayoshi Kaneda
Mathematics , 2010,
Abstract: We give a short proof of Belaga's result on bounds to perigees of $(3x+d)$-cycles of a given oddlength. We also reformulate the Collatz cycle conjecture which is rather a algorithmic problem into a purely arithmetic problem.
Local cut points and metric measure spaces with Ricci curvature bounded below
Masayoshi Watanabe
Mathematics , 2006,
Abstract: A local cut point is by definition a point that disconnectes its sufficiently small neighborhood. We show that there exists an upper bound for the degree of a local cut point in a metric measure space satisfying the generalized Bishop--Gromov inequality. As a corollary, we obtain an upper bound for the number of ends of such a space. We also obtain some obstruction conditions for the existence of a local cut point in a metric measure space satisfying the Bishop--Gromov inequality or the Poincar\'{e} inequality. For example, the measured Gromov--Hausdorff limits of Riemannian manifolds with a lower Ricci curvature bound satisfy these two inequalities.
A characterization of amenability of group actions on $C^\ast$-algebras
Masayoshi Matsumura
Mathematics , 2012,
Abstract: We show that coincidence of the full and reduced crossed product $C^\ast$-algebras of a group action on a unital commutative $C^\ast$-algebra implies amenability of the action whenever the group is exact. This is a partial answer to a problem posed by C. Anantharaman-Delaroche in 1987.
Lectures on Geometry and Topology of Polynomials - Surrounding the Jacobian Conjecture
Masayoshi Miyanishi
Mathematics , 2015,
Abstract: Recent developments of affine algebraic geometry, especially the theory of open algebraic surfaces, provide means to systematically explore geometric and topological properties of polynomials in two variables. Nevertheless, there is one unsurmountable problem remained even in the case of two variables, which has been unsolved since 1939, that is the Jacobian Conjecture. These are notes for author's lectures on the geometry and topology of polynomials and the Jacobian Conjecture delivered at the l'Universit\'e de Bordeaux I and at Osaka University in 2003.
Quasi-multipliers and algebrizations of an operator space
Masayoshi Kaneda
Mathematics , 2004,
Abstract: Let $X$ be an operator space, let $\phi$ be a product on $X$, and let $(X,\phi)$ denote the algebra that one obtains. We give necessary and sufficient conditions on the bilinear mapping $\phi$ for the algebra $(X,\phi)$ to have a completely isometric representation as an algebra of operators on some Hilbert space. In particular, we give an elegant geometrical characterization of such products by using the Haagerup tensor product. Our result makes no assumptions about identities or approximate identities. Our proof is independent of the earlier result of Blecher-Ruan-Sinclair that solved the case when the algebra has an identity of norm one, and our result is used to give a simple direct proof of this earlier result. We also develop further the connections between quasi-multipliers of operator spaces, and shows that the quasi-multipliers of operator spaces coincide with their $C^*$-algebraic counterparts.
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