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Search Results: 1 - 10 of 508 matches for " Hirokazu Akahori "
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The Regional Comprehensive Economic Partnership and Its Potential Impact on Greenhouse Gas Emissions  [PDF]
Hirokazu Akahori, Daisuke Sawauchi, Yasutaka Yamamoto
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.79105
Abstract: Whether trade liberalization resulting from mega free trade agreements, such as the Regional Comprehensive Economic Partnership (RCEP), will have an impact on the environment is the subject of ongoing debate and remains an empirical matter. In this paper, we contribute to the debate on the relation between trade and the environment by considering the case of the RCEP and examining whether it will increase or decrease greenhouse gas (GHG) emissions. We measure the impact of the RCEP on GHG emissions using the Global Trade Analysis Project (GTAP) model and the GTAP CO2 and non-CO2 emissions databases. Our results suggest that the RCEP is likely to “increase” the total amount of GHG emissions in the 16 RCEP members and the world.
Axiomatic Differential Geometry III-3-Its Landscape-Chapter 3: The Old Kingdom of Differential Geometers  [PDF]
Hirokazu Nishimura
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.86065
Abstract: The principal objective of this paper is to study the relationship between the old kingdom of differential geometry (the category of smooth manifolds) and its new kingdom (the category of functors on the category of Weil algebras to some smooth category). It is shown that the canonical embedding of the old kingdom into the new kingdom preserves Weil functors.
Local Time in Parisian Walkways
Jir? Akahori
Mathematics , 2006,
Abstract: In the present paper, Ito formula and Tanaka formula for a special kind of symmetric random walk in the complex plain are studied. The random walk is called Parisian walk, and its local time is defined to be the number of exit from some regions.
Discrete It? Formulas and Their Applications to Stochastic Numerics
Jir? Akahori
Mathematics , 2006,
Abstract: This is a survey note of the author's observations on the discrete-time analogues of It\^o formulas.
A mixed Hodge structure on a CR manifold
Takao Akahori
Mathematics , 1996,
Abstract: The purpose of this work is to propose a mixed Hodge structure over a CR manifold. As you know, for a CR manifold, Kohn-Rossi cohomology is naturally introduced. However, the relation between Kohn-Rossi cohomology and De Rham cohomology is not so well understood, even in Tanaka's work. We discuss this point.
A Discrete It? Calculus Approach to He's Framework for Multi-Factor Discrete Markets
Jir? Akahori
Mathematics , 2006,
Abstract: In the present paper, a discrete version of It\^o's formula for a class of multi-dimensional random walk is introduced and applied to the study of a discrete-time complete market model which we call He's framework. The formula unifies continuous-time and discrete-time settings and by regarding the latter as the finite difference scheme of the former, the order of convergence is obtained. The result shows that He's framework cannot be of order 1 scheme except for the one dimensional case.
Effective Life and Area Based Data Storing and Deployment in Vehicular Ad-Hoc Networks  [PDF]
Hirokazu Miura, Hideki Tode, Hirokazu Taki
Communications and Network (CN) , 2015, DOI: 10.4236/cn.2015.73014
Abstract: In vehicular ad-hoc networks (VANETs), store-carry-forward approach may be used for data sharing, where moving vehicles carry and exchange data when they go by each other. In this approach, storage resource in a vehicle is generally limited. Therefore, attributes of data that have to be stored in vehicles are an important factor in order to efficiently distribute desired data. In VANETs, there are different types of data which depend on the time and location. Such kind of data cannot be deployed adequately to the requesting vehicles only by popularity-based rule. In this paper, we propose a data distribution method that takes into account the effective life and area in addition to popularity of data. Our extensive simulation results demonstrate drastic improvements on acquisition performance of the time and area specific data.
The Effects of Handwritten Feedback on Paper and Tablet PC in Learning Japanese Writing
International Journal of Emerging Technologies in Learning (iJET) , 2007,
Abstract: This paper compares the effect of paper-basedhandwritten feedback (PBHF) and that of Tablet PC-basedhandwritten feedback (TBHF) in learning Japanese writing.The study contributes to the research on motivation,usability and presence when learners are given differentmedia-based handwritten error feedback. The resultsindicated that there was little difference in the effect of thetwo media on motivation and usability factors. However,PBHF showed a positive effect on presence factor thanTBHF. Also, there was little difference in proficiencyimprovement after the students reviewed different mediabased handwritten feedback. The results of this studysuggest that language teachers should not use ICT withtraditional strategies, but in an innovative way to improvetheir writing instruction and enhance learners’ writingproficiency.
Non-Equilibrium Ionization State and Two-Temperature Structure in the Bullet Cluster 1E0657-56
Takuya Akahori,Kohji Yoshikawa
Physics , 2011, DOI: 10.1093/pasj/64.1.12
Abstract: We investigate a non-equilibrium ionization state and an electron-ion two-temperature structure of the intracluster medium in the merging galaxy cluster, 1E0657-56 (the Bullet cluster), using a series of N-body and hydrodynamic simulations. We find that the electron temperature at the shock layer associated with the X-ray sub peak (bullet) is quite different depending on the thermal relaxation model between electrons and ions; ~25 keV for the Coulomb thermal relaxation model and ~45 keV for the instantaneous thermal relaxation model in the simulations which reproduce the observed X-ray morphology. Furthermore, both of Fe xxv and Fe xxvi are overabundant compared with the ionization equilibrium state around the shock layer, and thus, the intensity ratio between Fe xxv and Fe xxvi K alpha lines are significantly altered from that in the ionization equilibrium state. We also carry out the simulations with various sets of merger parameters, and discuss a possible range of the non-equilibrium effects in this system. Our results could be tested with future X-ray observations such as Astro-H with better sensitivity in high energy band.
Faraday Rotation Measure due to the Intergalactic Magnetic Field II: the Cosmological Contribution
Takuya Akahori,Dongsu Ryu
Physics , 2011, DOI: 10.1088/0004-637X/738/2/134
Abstract: We investigate the Faraday rotation measure (RM) due to the intergalactic magnetic field (IGMF) through the cosmic web up to cosmological distances, using a model IGMF based on turbulence dynamo in the large-scale structure of the universe. By stacking the IGMF and gas density data up to redshift $z=5$ and taking account of the redshift distribution of polarized background radio sources against which the RM is measured, we simulate the sky map of the RM. The contribution from galaxy clusters is subtracted from the map, based on several different criteria of X-ray brightness and temperature. Our findings are as follows. The distribution of RM for radio sources of different redshifts shows that the root-mean-square (rms) value increases with redshift and saturates for $z \ga 1$. The saturated value is RM$_{\rm rms} \approx$ several ${\rm rad m^{-2}}$. The probability distribution function of $|{\rm RM}|$ follows the lognormal distribution. The power spectrum has a broad plateau over the angular scale of $\sim 1 - 0.1^\circ$ with a peak around $\sim 0.15^\circ$. The second-order structure function has a flat profile in the angular separation of $\ga 0.2^\circ$. Our results could provide useful insights for surveys to explore the IGMF with the Square Kilometer Array (SKA) and upcoming SKA pathfinders.
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