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11. Concluding Remarks

Author

Adachi, Hideyuki, Inagaki, Kazuyuki, Nakamura, Tamotsu, Osumi, Yasuyuki, Adachi, Hideyuki, Inagaki, Kazuyuki, Nakamura, Tamotsu, and Osumi, Yasuyuki

Published
2019
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17. Automation and economic growth in a task‐based neoclassical growth model.

Author

Ikeshita, Kenichiro, Uchida, Hideaki, and Nakamura, Tamotsu

Subjects
WAGE increases, ECONOMIC expansion, AUTOMATION, TECHNOLOGICAL progress, PRICES
Abstract

This paper incorporates a task‐based approach into the Solow growth model to analyze the effects of automation on economic growth. We find that if task producers smoothly adopt automation technology along the capital accumulation path, sustained growth is possible even without technological progress. This result is brought about by the fact that task automation makes the aggregate production function linear. In addition, we demonstrate that both the rental price of capital and the wage are constant on the growth path. In sum, while the interaction between task automation and capital accumulation can be a pathway for sustained growth in output, it leads to the cease of wage growth in the long run. [ABSTRACT FROM AUTHOR]

Published
2023
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42. Size, Internationalization and University Rankings: Evaluating Times Higher Education (THE) Data for Japan

Author

McAleer, Michael, Nakamura, Tamotsu, and Watkins, Clinton

Subjects
Enseñanza universitaria, Econometría
Abstract

International and domestic rankings of academics, academic departments, faculties, schools and colleges, institutions of higher learning, states, regions and countries, are of academic and practical interest and importance to students, parents, academics, and private and public institutions. International and domestic rankings are typically based on arbitrary methodologies and criteria. Evaluating how the rankings might be sensitive to different factors, as well as forecasting how they might change over time, requires a statistical analysis of the factors that affect the rankings. Accurate data on rankings and the associated factors is essential for a valid statistical analysis. In this respect, the Times Higher Education (THE) World University Rankings is one of the three leading and most influential annual sources of international university rankings. Using recently released data for a single country, namely Japan, the paper evaluates the effects of size (specifically, the number of Full-Time Equivalent (FTE) students, or FTE(Size)) and internationalization (specifically, the percentage of international students, or IntStud) on academic rankings using THE data for 2017 and 2018 on 258 national, public (that is, prefectural or city), and private universities. The results show that both size and internationalization are statistically significant in explaining rankings for all universities, as well as separately for private and non-private (that is, national and public) universities, in Japan for each of 2017 and 2018.

Published
2019

43. FEM simulation of a friction testing method based on combined forward conical can-backward straight can extrusion

Author

Nakamura, Tamotsu, Bay, Niels, and Zhang, Zhi-Liang

Subjects
Friction -- Testing, Skin friction (Fluid dynamics) -- Testing, Forging -- Methods, Finite element method -- Usage, Science and technology
Abstract

A new friction testing method based on combined forward conical can-backward straight can extrusion is proposed in order to evaluate friction characteristics in severe metal forming operations. By this method the friction coefficient along the conical punch surface is determined knowing the friction coefficient along the die wall. The latter is determined by a combined forward and backward can extrusion of straight cans. Calibration curves determining the relationship between punch travel, can heights, and friction coefficient for the two tests are calculated based on a rigid-plastic FEM analysis. Experimental friction tests are carried out in a mechanical press with aluminium alloy A6061 as the workpiece material and different kinds of lubricants. They confirm that the theoretical analysis results in reasonable values for the friction coefficient.

Published
1998

44. FEM simulation of friction testing method based on combined forward rod-backward can extrusion

Author

Nakamura, Tamotsu, Bay, Niels, and Zhang, Zhi-Liang

Subjects
Friction -- Research, Synthetic lubricants -- Research, Science and technology
Abstract

A new friction testing method by combined forward rod-backward can extrusion is proposed in order to evaluate frictional characteristics of lubricants in forging processes. By this method the friction coefficient [Mu] and the friction factor m can be estimated along the container wall and the conical die surface in the forward rod extrusion using theoretical calibration diagrams representing the relationship between the punch travel, the forward rod extrusion length and [Mu] or m without requirements of measuring the forming forces and the flow stress of the workpiece. The theoretical calibration curves are obtained by rigid-plastic FEM simulations in a combined forward rod-backward can extrusion process for a reduction in area [R.sub.h] = 25, 50 and 70 percent in the backward can extrusion. It is confirmed that the friction factor [m.sub.p] on the punch nose in the backward can extrusion has almost no influence on the calibration curves. The optimum initial height/diameter ratio of the workpiece is 1.0-1.1. The influence of the workhardening index on the calibration curves is insignificant in the range 0.1 [less than or equal to] n [less than or equal to] 0.5. Experimental friction tests are carried out in a mechanical press with aluminium alloy A6061 as the workpiece material and different kinds of lubricants. They confirm the analysis resulting in reasonable values for the friction coefficient and the friction factor.

Published
1997

45. Size, Internationalization and University Rankings: Evaluating and predicting Times Higher Education (THE) data for Japan

Author

McAleer, Michael, Nakamura, Tamotsu, Watkins, Clinton, McAleer, Michael, Nakamura, Tamotsu, and Watkins, Clinton

Abstract

International and domestic rankings of academics, academic departments, faculties, schools and colleges, institutions of higher learning, states, regions and countries, are of academic and practical interest and importance to students, parents, academics, and private and public institutions. International and domestic rankings are typically based on arbitrary methodologies and criteria. Evaluating how the rankings might be sensitive to different factors, as well as forecasting how they might change over time, requires a statistical analysis of the factors that affect the rankings. Accurate data on rankings and the associated factors is essential for a valid statistical analysis. In this respect, the Times Higher Education (THE) World University Rankings is one of the three leading and most influential annual sources of international university rankings. Using recently released data for a single country, namely Japan, the paper evaluates the effects of size (specifically, the number of Full-Time Equivalent (FTE) students, or FTE(Size)) and internationalization (specifically, the percentage of international students, or IntStud) on academic rankings using THE data for 2017 and 2018 on 258 national, public (that is, prefectural or city), and private universities. The results show that both size and internationalization are statistically significant in explaining rankings for all universities, as well as separately for private and non-private (that is, national and public) universities, in Japan for each of 2017 and 2018.

Published
2019

49. The Many Futures of Alpinism.

Author

Ives, Katie, House, Steve, Livingstone, Tom, Harrington, Brette, Papert, Ines, Yangjee, Pasang, Sherpa, Mingma Gyalje, Dhar, Amrita, Purandare, Nandini, Salema, Glory Thobias, Tariq, Hanniah, Gonzáles, José, Necefer, Len, Ribeyre, Benjamin, Nakamura, Tamotsu, Hessler, John, Cordes, Kelly, Prezelj, Marko, Stuckey, Jason, and Vidal, Sílvia

Subjects
GRANDPARENT-grandchild relationships, HAZARDOUS waste sites, SELF, ANIMAL tracks, OPTICAL radar, ENVIRONMENTAL sciences
Abstract

Among numerous climbers I've spoken with, there's an increasing awareness of how alpinism itself interweaves with larger issues, from the carbon emissions of flights to distant ranges to the environmental impacts of gear manufacturing, from the barriers that alpinists from marginalized groups confront to the ongoing inequities in much of the mountain travel industry - and more. Mountain escapism, also known as "just mountaineering" (although the "just mountaineers" will be annoyed with me for saying so) resembles an insistence that one "does not see race." "One of the greatest challenges of mountaineering", as the Canadian alpinist Marc-André Leclerc once wrote, "is in dealing with the natural obstacles the mountain provides." From a Sherpa perspective, an expedition to the summit is not only an act of performing technical skills on the mountain, but also a careful consideration of the relationship between the climber and the mountain. - Japanese mountaineer and Alpinist contributor Kei Taniguchi (1972- 2015) in 2009 became the first woman to receive a Piolet d'Or. [Extracted from the article]

Published
2021

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