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Numerical Modeling of Conical Fluidized Bed Combustors Considering Particle Slip on Wal
Hamada Abdelmotalib,Ik-Tae Im(임익태) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this paper, the hydrodynamics and wall to bed heat transfer of a gas?solid flow in a conical fluidized bed were simulated using the Eulerian-Eulerian model. Sand with a particle diameter of 560 μm was used as a bed material, and its properties were calculated by applying the kinetic theory of granular flow (KTGF). Different amounts of slip between the particle and wall were shown by varying the specularity coefficient. The effects of specularity (0, 0.2, 0.5, and 1.0) on hydrodynamic and wall to bed heat transfer at a superficial gas velocity of 2 m/s were investigated. It was found that the wall to bed heat transfer coefficient decreases with increasing specularity coefficient. Different values of the specularity coefficient resulted in almost the same hydrodynamic behavior near the wall and the center of the bed.
The Anatomy of Bubble Economy in Japan
Hamada, Yasuyuki 연세대학교 산업경영연구소 1992 산업과경영 Vol.10 No.1
"Bubble Economy," describes well the scene of Japanese economy since the end of 1980's. The purpose of this paper is to try to find the core of Bubble. It leads us to some explanations to the following questions: 1. Why did "Bubble" occur in Japan typically? 2. Why did "Bubble" emerge in the second half of 1980's, especially after 1987? 3. Why did "Bubble" emerge as a stock-inflation?
Live Exhibitions in the Classroom with Mathematical Software
( Hamada Tatsuyoshi ) 한국수학교육학회 2012 수학교육 학술지 Vol.2012 No.2
Generally, we have “Intensive Course” for undergraduate and graduate students in any universities in Japan. We give credit hours with lectures of four or five days and reports. For students, it is a good system for getting new knowledge from professors of different universities intensively. In this article, I want to describe my experiences of intensive courses with mathematical software and the effectiveness of the live exhibitions in the classroom.
Memory in de Sitter space and Bondi-Metzner-Sachs-like supertranslations
Hamada, Yuta,Seo, Min-Seok,Shiu, Gary American Physical Society 2017 Physical Review D Vol.96 No.2
<P>It is well known that the memory effect in flat spacetime is parametrized by the Bondi-Metzner-Sachs (BMS) supertranslation. We investigate the relation between the memory effect and diffeomorphism in de Sitter spacetime. We find that gravitational memory is parametrized by a BMS-like supertranslation in the static patch of de Sitter spacetime. We also show a diffeomorphism that corresponds to gravitational memory in the Poincare/cosmological patch. Our method does not need to assume the separation between the source and the detector to be small compared with the Hubble radius, and can potentially be applicable to other Friedmann-Lemaitre-Robertson-Walker universes, as well as 'ordinary memory' mediated by massive messenger particles.</P>
Finite element modelling of transmission line structures under tornado wind loading
Hamada, A.,El Damatty, A.A.,Hangan, H.,Shehata, A.Y. Techno-Press 2010 Wind and Structures, An International Journal (WAS Vol.13 No.5
The majority of weather-related failures of transmission line structures that have occurred in the past have been attributed to high intensity localized wind events, in the form of tornadoes and downbursts. A numerical scheme is developed in the current study to assess the performance of transmission lines under tornado wind load events. The tornado wind field is based on a model scale Computational Fluid Dynamic (CFD) analysis that was conducted and validated in a previous study. Using field measurements and code specifications, the CFD model data is used to estimate the wind fields for F4 and F2 full scale tornadoes. The wind forces associated with these tornado fields are evaluated and later incorporated into a nonlinear finite element three-dimensional model for the transmission line system, which includes a simulation for the towers and the conductors. A comparison is carried between the forces in the members resulting from the tornadoes, and those obtained using the conventional design wind loads. The study reveals the importance of considering tornadoes when designing transmission line structures.
Design Method of 2-D Lattice Digital Filters Using the Genetic Algorithm
Hamada, Nozomu,Kishida, Masahiko 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes design method of 2-D lattice digital filters using the Genetic Algorithm(GA). By using the GA, they are derived directly from the desired frequency response, and 2-D stable nonseparable-denominator transfer functions can be obtained. In our method, ARMA transfer functions are designed by two algorithms. One is to optimize AR and MA parameters simultaneously, and the other is to search an optimal AR parameters with fixed MA parameters, and then search an optimal MA parameters separately. Both are done by the GA, and the simulation shows that they give the simillar results.
QUASICONFORMAL EXTENSIONS OF STARLIKE HARMONIC MAPPINGS IN THE UNIT DISC
Hamada, Hidetaka,Honda, Tatsuhiro,Shon, Kwang Ho Korean Mathematical Society 2013 대한수학회보 Vol.50 No.4
Let $f$ be a harmonic mapping on the unit disc ${\Delta}$ in $\mathbb{C}$. We give some condition for $f$ to be a quasiconformal homeomorphism on ${\Delta}$ and to have a quasiconformal extension to the whole plane $\bar{\mathbb{C}}$. We also obtain quasiconformal extension results for starlike harmonic mappings of order ${\alpha}{\in}(0,1)$.
An Instance-Oriented Modeling Method for Shipbuilding Applications
Hamada, Shinro,Konaka, Kiyoshi The Society of Naval Architects of Korea 2001 Journal of ship and ocean technology Vol.5 No.2
Data in one Product Model for shipbuilding is inevitably referenced and manipulated during each phase of design or production activities, and data or manipulation status naturally varies from the original with the advance of each activities. For Object-Oriented approach, it is hard to identify classes dealing with those variations, and even if once a product model is developed, it might be getting much harder to modify it to cope with a new additional phase of activities. This paper proposes an Instance-Oriented Modeling Method, temporarily named “Concept-Relationship Modeling Approach”, which handles Data structure and Behavior independently of each other in order to resolve the difficulties above.