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Article
Publication date: 1 April 1982

Yukio KAGAWA, Tadakuni MURAI and Shinji KITAGAMI

A technique combining finite elements and boundary elements is promising for unbounded field problems. A hypothetical boundary is assumed in the unbounded domain, and the usual…

49

Abstract

A technique combining finite elements and boundary elements is promising for unbounded field problems. A hypothetical boundary is assumed in the unbounded domain, and the usual finite element method is applied to the inner region, while the boundary element method is applied to the outer infinite region. On the coupling boundary, therefore, both potential and flux must be compatible. In the finite element method, the flux is defined as the derivative of the potential for which a trial function is defined. In the boundary element method, on the other hand, the same polynomial function is chosen for the potential and the flux. Thus, the compatibility cannot be satisfied unless a special device is considered. In the present paper, several compatibility conditions are discussed concerning the total flux or energy flow continuity across the coupling boundary. Some numerical examples of Poisson and Helmholtz problems are demonstrated.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 1 no. 4
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 March 1986

Etsumasa KAMEDA and Yukio KAGAWA

Materials with anisotropic conductivity are frequently used as sensors in electrical industries. In this paper, an anisotropic conductivity tensor to express Hall effect in n‐type…

124

Abstract

Materials with anisotropic conductivity are frequently used as sensors in electrical industries. In this paper, an anisotropic conductivity tensor to express Hall effect in n‐type semiconductors is derived and its steady‐current field is solved using the finite element method. Some numerical examples are given and comparison with measured data is discussed.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 5 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 April 1987

Junwei LU and Yukio KAGAWA

Ion‐acoustic wave propagation in plasma is discussed. Analytical and numerical solutions are given for one‐dimensional plane waves. The similarity of the ion‐acoustic waves to the…

47

Abstract

Ion‐acoustic wave propagation in plasma is discussed. Analytical and numerical solutions are given for one‐dimensional plane waves. The similarity of the ion‐acoustic waves to the waves associated with an electrical transmission line is pointed out and the solved examples are compared with experimental observations.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 6 no. 4
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 February 1991

Yukio KAGAWA and Tadakuni MURAI

A numerical integration scheme using the Monte Carlo method is discussed to evaluate the singular integral in boundary elements. A numerical demonstration is given for some…

93

Abstract

A numerical integration scheme using the Monte Carlo method is discussed to evaluate the singular integral in boundary elements. A numerical demonstration is given for some potential problems. Results evaluated by the Monte Carlo method are compared with the analytical ones for accuracy and computation time. Examination shows the validity and capability of the approach.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 10 no. 2
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 December 2001

Yukio Kagawa, Takao Tsuchiya, Hirohisa Yamaguchi, Akihiro Fuke and Lingyun Chai

The two‐dimensional discrete Huygens’ modelling or TLM simulation is presented for the TE electromagnetic field problems. The TLM element or node with variable traveling speed and…

302

Abstract

The two‐dimensional discrete Huygens’ modelling or TLM simulation is presented for the TE electromagnetic field problems. The TLM element or node with variable traveling speed and characteristic impedance is applied to several practical problems including scattering at the edge of a wall and over periodic grids or grooves, wave propagation along a dielectric structure, and a mode coupling between two parallel optical waveguides. The TLM solutions are compared with the theoretical ones or the results of other numerical methods and reasonable agreement is achieved.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 20 no. 4
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 July 1999

Hiroshi Ishida

What were the spinning industries like in the initial stage in Japan? From which class did the founders of these industries come, ex‐warrior or commoners (merchants or farmers)…

426

Abstract

What were the spinning industries like in the initial stage in Japan? From which class did the founders of these industries come, ex‐warrior or commoners (merchants or farmers)? This will interest readers. Viewed from a capital investment, it was most significant in Japan whether the government financed an industry or not. This article deals with Tanigawa Tatsumi, the founder president (presidency 1885‐1911) of Okayama Cotton Spinning Company (an enterprise for employing ex‐warriors). Whereas cotton spinning companies for employing ex‐warriors played an important role in the initial stages of the development of the cotton spinning industry, these became bankrupt before long. Under such circumstances, Tanigawa’s Spinning Company weathered many years. An examination of a brief history of Okayama Spinning Company with special reference to Tanigawa’s life history will reveal the significance of the entrepreneur’s learning and virtue, organizing ability, and leadership. Furthermore, it will make clear what otherwise might have been overlooked about the initial nature of industrialization in Japan.

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International Journal of Social Economics, vol. 26 no. 7/8/9
Type: Research Article
ISSN: 0306-8293

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Book part
Publication date: 23 November 2020

Masao Yamaguchi

Recent empirical studies have improved methodologies for identifying the causal effects of policies especially on a minimum wage hike. This study identifies causal effects of…

Abstract

Recent empirical studies have improved methodologies for identifying the causal effects of policies especially on a minimum wage hike. This study identifies causal effects of minimum wage hikes across 47 prefectures in Japan from 2008 to 2010 on employment, average hourly wage, work hours, full-time equivalent employment (FTE), total wage costs, average tenure, separation and new hiring in establishments using a micro dataset of business establishments in restaurant, accommodation, and food takeout and delivery industry. Various regression specifications including controls for time-varying regional heterogeneity are implemented by using the bite of the minimum wage in each establishment. First, this study finds that the effects of a revision of minimum wage on employment and FTE in the establishment are statistically insignificant, but the effects on hourly wages and total wage costs are statistically significant. Subsequently, it considers how the establishments react to the increase in total wage costs caused by the revised minimum wage, and finds that separation from the establishment may decrease, and average tenure of workers may increase.

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Change at Home, in the Labor Market, and On the Job
Type: Book
ISBN: 978-1-83909-933-5

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