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Search Results: 1 - 10 of 415 matches for " Akimitsu Ishizuka "
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Feasibility Study to Evaluate Lattice-Space Changing of a Step-Graded SiGe/Si (110) Using STEM Moiré  [PDF]
Junji Yamanaka, Mai Shirakura, Chiaya Yamamoto, Kei Sato, Takane Yamada, Kosuke O. Hara, Keisuke Arimoto, Kiyokazu Nakagawa, Akimitsu Ishizuka, Kazuo Ishizuka
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.67002
A moiré between crystal lattice planes and scanning electron beam-lines formed in a scanning transmission electron microscope includes the information of the lattice spacing. We apply these phenomena to a compositionally graded SiGe thin film deposited onto a Si substrate by molecular beam epitaxy method. The results of the experiments and image analysis show the potential of this technique to analyze a slight change of the lattice spacing according to a compositional change.
An Empirical Analysis of Women’s Promotion in Japanese Companies: Comparison with Chinese and Korean Cases  [PDF]
Hiromi Ishizuka
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.63063
Abstract: The purpose of this study is to contribute to the economic revitalization of Japan by learning from other countries through a consideration of diversity. From Chinese urban areas, we study an example of a fluid labor market, and a firmly rooted movement of women into the workplace. From Korea, even though the male-female disparities are greater than those in Japan, we study a concrete case in terms of the rapid speed of the changing workplace. The framework includes not only promotion at the company level, but also lifestyle at the household level. The study uses the numerical values and analysis is through the Negative Binominal Regression Model. Findings include: 1) in Japan, there is “slow promotion” in the both case of men and women and a “glass ceiling” for women; 2) in China, the decisive male-female disparity is the difference in the “age of fixed retirement”. Gender gaps in working conditions are uncommon. Home factors slightly disturb promotions. Tenure is short and there is a fluid labor market. There is a “sticky floor” for women; 3) in Korea, the gender gap of graduate’s with more than a bachelor’s degree is small. Men with no official title are concentrated in the low rank, and have long tenures. There is a “sticky floor” for men. There are two years of compulsory military service for young men. Despite this, many men are promoted to higher managerial positions in their lifetimes.
An Empirical Analysis of Substitution and Complementarity of Gender Labor Demand of Enterprises in Japan, Korea, and China: With a Factor Decomposition of Gender Wage Differentials  [PDF]
Hiromi Ishizuka
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.810125
Abstract: The purpose of this study is the effect of expansion of female labor demand on male labor demand for labor market reform to facilitate Japanese economic development. Firstly, the estimates using Hicks’ (1970) partial elasticity of complementarity and Allen’s (1938) partial elasticity of substitution revealed an increase in male labor demand when female labor demand increased in all three countries. The results were a relationship of complementarity in labor demand between male and female regular employees in the order of China, South Korea, Japan. However, a push factor or a pull factor is assumed to make up a complementarity relationship. Therefore secondly, the factor decomposition analysis of wage gap is used to investigate which factors are applicable. The gender wage gap consists of economic rationality and economic irrational discriminatory [Neumark (1988); Oaxaca and Ransom (1994)]. The gap was confirmed in all three countries. Although the actual gender average wage difference was small in China, “discriminatory preference theory” was suggested that there is underpayment of women in Japan and Korea. In Japan, as women have a high potential labor force participation rate, expansion of female labor demand seems promising as an economic policy, not least because of the declining population. Labor-related economic policies are needed, such as the creation of a fluid labor market in China, or the implementation of effective
Integrative role of the histaminergic system in feeding and taste perception
Tomoko Ishizuka
Frontiers in Systems Neuroscience , 2012, DOI: 10.3389/fnsys.2012.00044
Abstract: Feeding behavior is regulated by a complex interplay of many endogenous substances, such as peptides and neurotransmitters in the central nervous system. Histamine is a neurotransmitter which expresses an anorectic effect on food intake via histamine H1 receptors. The histaminergic system exists downstream of leptin, a satiety factor secreted from white adipose tissue. Because direct stimulation of the histaminergic system by histamine H3-inverse agonists or antagonists can normalize the obese phenotype in which animal models with exogenous leptin resistance, which resembles human obesity, the potential roles of histamine H3 receptors as a therapeutic target now draw attention. Histaminergic activity is enhanced during feeding, and an oral somatic sensation is thought to affect histaminergic activity while blood glucose levels do not. In addition, gustatory information can modulate histaminergic activity by two mechanisms: by physiological excitation of the chorda tympani nerve, one of the taste nerves and by emotions elicited by taste perception, i.e., taste palatability. Particularly, aversive and hazardous taste stimuli tonically facilitate histaminergic activity, suggesting that the histaminergic system is involved in the response to harmful stimuli. Together with recent findings, it is postulated that the histaminergic system responds to both mechanical and chemical sensory input from the oral cavity during feeding and is exerted as a part of the danger response system.
$K\to ππ$ Decay Amplitude on the Lattice
N. Ishizuka
Physics , 2002, DOI: 10.1016/S0920-5632(03)01495-6
Abstract: Recent theoretical and numerical progresses of the lattice calculations of $K\to\pi\pi$ decay amplitude are reviewed.
Derivation of Lüscher's finite size formula for $Nπ$ and $NN$ system
N. Ishizuka
Physics , 2009,
Abstract: I present derivation of L\"uscher's finite size formula for the elastic $N\pi$ and the $NN$ scattering system for several angular momenta from the relativistic quantum field theory.
Long non-coding RNAs in cancer progression
Keiko Tano,Nobuyoshi Akimitsu
Frontiers in Genetics , 2012, DOI: 10.3389/fgene.2012.00219
Abstract: Recent large-scale transcriptome analyses have revealed that transcription is spread throughout the mammalian genomes, yielding large numbers of transcripts, including long non-coding RNAs (lncRNAs) with little or no protein-coding capacity. Dozens of lncRNAs have been identified as biologically significant. In many cases, lncRNAs act as key molecules in the regulation of processes such as chromatin remodeling, transcription, and post-transcriptional processing. Several lncRNAs (e.g., MALAT1, HOTAIR, and ANRIL) are associated with human diseases, including cancer. Those lncRNAs associated with cancer are often aberrantly expressed. Although the underlying molecular mechanisms by which lncRNAs regulate cancer development are unclear, recent studies have revealed that such aberrant expression of lncRNAs affects the progression of cancers. In this review, we highlight recent findings regarding the roles of lncRNAs in cancer biology.
Preparation of large-scale ring carbon nanotube networks and a general growth mechanism for carbon nanotubes
Zhi-An Ren,Jun Akimitsu
Physics , 2006,
Abstract: Large-scale fully interconnected ring carbon nanotube (CNT) networks were first prepared using thermo chemical vapor deposition in nano-channel network templates of porous anodic alumina. This conductive CNT network film consists of billions of nanotube segments with a single layer, and could be made as large as the centimeter size of the template, with a uniform two-dimensional ring topological structure. These CNT networks could be grown from tiny Fe/Co catalyst particles which were electro-deposited into the templates, or totally without additional metallic catalysts. The common interconnected ring topology suggests a both-tip growth mechanism in which the growth of every CNT should occurs at both ends by the incorporation of carbon clusters until they connect into other CNTs. Comparing the different morphology of CNT networks grown with and without catalyst particles, we found that the local concentration of carbon clusters should play the key role for the continued growth of CNTs.
Generation of Variations on Theme Music Based on Impressions of Story Scenes Considering Human's Feeling of Music and Stories
Kenkichi Ishizuka,Takehisa Onisawa
International Journal of Computer Games Technology , 2008, DOI: 10.1155/2008/281959
Abstract: This paper describes a system which generates variations on theme music fitting to story scenes represented by texts and/or pictures. Inputs to the present system are original theme music and numerical information on given story scenes. The present system varies melodies, tempos, tones, tonalities, and accompaniments of given theme music based on impressions of story scenes. Genetic algorithms (GAs) using modular neural network (MNN) models as fitness functions are applied to music generation in order to reflect user's feeling of music and stories. The present system adjusts MNN models for each user on line. This paper also describes the evaluation experiments to confirm whether the generated variations on theme music reflect impressions of story scenes appropriately or not.
Ecological Impact on Nitrogen and Phosphorus Cycling of a Widespread Fast-growing Leguminous Tropical Forest Plantation Tree Species, Acacia mangium
Masahiro Inagaki,Shigehiro Ishizuka
Diversity , 2011, DOI: 10.3390/d3040712
Abstract: Symbiotic nitrogen fixation is one of the major pathways of N input to forest ecosystems, enriching N availability, particularly in lowland tropics. Recently there is growing concern regarding the wide areas of fast-growing leguminous plantations that could alter global N 2O emissions. Here, we highlight substantially different N and phosphorus utilization and cycling at a plantation of Acacia mangium, which is N 2-fixing and one of the major plantation species in tropical/subtropical Asia. The litterfall, fresh leaf quality and fine-root ingrowth of A. mangium were compared to those of non-N 2-fixing Swietenia macrophylla and coniferous Araucaria cunninghamii in wet tropical climates in Borneo, Malaysia. The N and P concentrations of the A. mangium fresh leaves were higher than those of the other two species, whereas the P concentration in the leaf-litterfall of A. mangium was less than half that of the others; in contrast the N concentration was higher. The N:P ratio in the A. mangium leaf was markedly increased from fresh-leaf (29) to leaf-litterfall (81). Although the N flux in the total litterfall at the A. mangium plantation was large, the fine-root ingrowth of A. mangium significantly increased by applying both N and P. In conclusion, large quantities of N were accumulated and returned to the forest floor in A. mangium plantation, while its P resorption capacity was efficient. Such large N cycling and restricted P cycling in wide areas of monoculture A. mangium plantations may alter N and P cycling and their balance in the organic layer and soil on a stand level.
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