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?

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>

Numerical Study on the Wall to Bed Heat Transfer in a Conical Fluidized Bed Combustor

Hamada Mohamed Abdelmotalib,Mahmoud Abdelftah Youssef,Ali Ahmed Hassan,윤석범,임익태 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

In this work a numerical investigation of wall to bed heat transfer, and the related flow characteristics, was conducted along a conical fluidized bed combustor with a height of 0.8 m and a cone angle of 30o. A two-fluid Eulerian-Eulerian model was used while applying Kinetic Theory for Granular Flow (KTGF) to a wall-to-bed FB reactor. The heat transfer coefficient and hydrodynamics are discussed for two different drag models, namely the Gidaspow and Syamlal-O’Brien models. Furthermore, computational calculations were carried out for a variety of inlet velocities(1.4Umf~4 Umf) and different particle sizes. The heat transfer coefficient in the bed region was evaluated and compared with that calculated by penetration theory. The bed expansion for the two models was compared with that calculated using correlations from literature in order to validate the numerical calculations. The heat transfer coefficient was found to be increasing with increasing gas velocity and decreasing with increasing particle diameter.

Anatomical and histological studies of the coracohumeral ligament

Hamada J,Nimura A,Yamaguch K,Yoshimura H,Mochizuki T,Akita K 대한견주관절의학회 2013 대한견주관절학회 학술대회논문집 Vol.2013 No.3

Numerical Study on Heat Transfer According to Different Flow Regimes in Fluidized Bed Reactors

Hamada M. Abdelmotalib,Ik-Tae Im(임익태) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.4

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.

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.

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.

Effect of Aft-deck Length on the Performance of Serpentine Nozzle

Hamada Mohamed(하마다 모하메드),Changwook Lee(이창욱),Heeju Choi(최희주),Jeekeun Lee(이지근) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8

Serpentine nozzle has been widely utilized in many types of aircraft to minimize the infrared radiation emitted by high temperature parts and exhaust systems. Annular mixer was used in the infrared suppressor of exhaust system to mix the cold outside air with hot gases from the engine. The most important parameters can evaluate the performance of the nozzle with lobed mixer include mixing effectiveness, pressure loss, and pumping performance. A central plug is used at the exit of the lobed nozzle to penetrate the primary stream in the nozzle. In this study a numerical investigation of flow characteristics of the serpentine nozzle with lobed mixer was conducted. The flow characteristics such as velocity, temperature, pressure of the lobed mixer were studied. The three-dimensional model of the serpentine nozzle was used in the simulations that carried out using Star CCM software. The grid system com-posed of 8,364,993 polyhedral cells. Hot gases enter the nozzle through the core that treated as stagnation inlet at a pressure and temperature of 45023 Pa and 811.8 K, respectively. While, the cold air at pressure and temperature of 48963 Pa and 334.8 K, respectively enters via the bypass that considered as stagnation inlet. The outlet of the nozzle was treated as a pressure outlet subjected to atmospheric pressure and temperature. The nozzle body was considered as adiabatic walls with no-slip boundary conditions. The results showed that the increasing aft-deck decreased the temperature inside the nozzle and at exhausted gases that reduced the infrared temperature.

Vitamin D status after colorectal cancer diagnosis and patient survival according to immune response to tumour

Hamada, Tsuyoshi,Liu, Li,Nowak, Jonathan A.,Mima, Kosuke,Cao, Yin,Ng, Kimmie,Twombly, Tyler S.,Song, Mingyang,Jung, Seungyoun,Dou, Ruoxu,Masugi, Yohei,Kosumi, Keisuke,Shi, Yan,da Silva, Annacarolina,G Elsevier 2018 European journal of cancer Vol.103 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>High-level plasma 25-hydroxyvitamin D [25(OH)D] has been associated with lower colorectal cancer incidence and mortality. Considering evidence indicating immunomodulatory effects of vitamin D, we hypothesised that survival benefits from high systemic vitamin D level might be stronger for colorectal carcinoma with lower immune response to tumour.</P> <P><B>Methods</B></P> <P>Using 869 colon and rectal cancer cases within the Nurses' Health Study and Health Professionals Follow-up Study, we assessed the prognostic association of postdiagnosis 25(OH)D score [derived from diet and lifestyle variables to predict plasma 25(OH)D level] in strata of levels of histopathologic lymphocytic reaction. The Cox proportional hazards regression model was adjusted for potential confounders, including microsatellite instability, CpG island methylator phenotype, LINE-1 methylation, <I>PTGS2</I> (cyclooxygenase-2) expression and <I>KRAS</I>, <I>BRAF</I> and <I>PIK3CA</I> mutations.</P> <P><B>Results</B></P> <P>The association of postdiagnosis 25(OH)D score with colorectal cancer-specific mortality differed by levels of peritumoural lymphocytic reaction (<I>p</I> <SUB>interaction</SUB> = 0.001). Multivariable-adjusted mortality hazard ratios for a quintile-unit increase of 25(OH)D score were 0.69 [95% confidence interval (CI), 0.54–0.89] in cases with negative/low peritumoural lymphocytic reaction, 1.08 (95% CI, 0.93–1.26) in cases with intermediate peritumoural reaction and 1.25 (95% CI, 0.75–2.09) in cases with high peritumoural reaction. The survival association of the 25(OH)D score did not significantly differ by Crohn's-like lymphoid reaction, intratumoural periglandular reaction or tumour-infiltrating lymphocytes.</P> <P><B>Conclusions</B></P> <P>The association between the 25(OH)D score and colorectal cancer survival is stronger for carcinomas with lower peritumoural lymphocytic reaction. Our results suggesting interactive effects of vitamin D and immune response may contribute to personalised dietary and lifestyle intervention strategies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The survival association of vitamin D is stronger in cancer with fewer lymphocytes. </LI> <LI> Vitamin D and peritumoural lymphocytes interact to modify cancer progression. </LI> <LI> Vitamin D may exert anti-tumour immune-enhancing effects. </LI> <LI> Peritumoural lymphocytic reaction may be a biomarker for benefits from vitamin D. </LI> <LI> Our data support immunomodulatory lifestyle interventions for cancer patients. </LI> </UL> </P>