• International Journal of Human Ecology
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• 제9권1호
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• pp.1-4
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• 2008

• Journal of international Conference on Electrical Machines and Systems
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• 제2권2호
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• pp.127-133
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• 2013

In this paper, the authors designed a surface permanent magnet (SPM)-type vernier motor whose maximum output is more than 5.2 kW, whose power factor at 4 kW is more than 90%, and whose efficiency at 4 kW is 85% under the conditions that the operating voltage, frequency, and synchronous speed are 400 V, 50 Hz, and 100 min-1, respectively.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권1호
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• pp.1-8
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• 2013

Surface permanent magnet-type vernier motors with three magnet array-type rotors (parallel magnetized type, repulsion type, and Halbach type) are compared based on the pull-out torque. It was clarified that increasing the rotor radius increases the pull-out torque at a fixed three-phase alternating voltage. The mechanism for the pull-out torque increase on each magnet array type was different, when the effects of the increase were analyzed based on an induced electromotive force and a synchronous reactance. As a result, the design of the Halbach-type rotor was found to be especially effective for achieving high pull-out torque, because this array type achieves a large induced electromotive force $E_0$ and a small synchronous reactance $x_s$.

• 디지털융복합연구
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• 제14권6호
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• pp.371-380
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• 2016

본 연구의 목적은 일본의 국제교양대학의 융합교육에 대해 살펴보는 것이다. 오늘날 한국의 대학의 경쟁은 점점 더 심화되고 있으며, 그 강도는 지속적으로 높아질 것으로 판단된다. 이러한 상황적 요인을 고려할 때 우리와 닮은꼴인 일본의 대학의 상황에서 성공적으로 대학을 운영하고 있는 국제교양대학의 사례는 우리 대학에 의미 있는 함의를 제공해 줄 것으로 판단된다. 국제교양대학의 특징은 두 가지로 정리해 볼 수 있다. 첫째, 국제화 교육이다. 아키타의 국제화교육의 핵심은 재학생을 위한 국제화이다. 하지만 자국 학생을 위해 외국인을 위한 프로그램의 개발 및 제공에도 적극적이라는 점이 차이점이다. 둘째, 교양교육이다. 교양 교육의 특징은 다양성이다. 전공 교육은 해당 분야에 대한 깊이 있는 학습을 한다. 반면에 교양교육은 다양한 분야에 대한 기초 학습을 한다. 이러한 교육을 제공하는 이유는 다양성 속에서 자신의 방향을 찾도록 하기 위함이다. 자신의 미래를 입학 당시 전공으로 정해버리는 것이 아니라 4년 동안 스스로 다양한 과목을 수강하면서 찾아나가도록 유도하는 것이다. 정리하면, 국제화 교육과 스스로 학습을 유도하는 환경을 제공하는 것이 이들 교육의 성공요인이라고 볼 수 있다.

• International Journal of Control, Automation, and Systems
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• 제2권3호
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• pp.319-332
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• 2004

This paper proposes some further improvements on N.K. Bose's 2D stability test for polynomials with real coefficients by revealing symmetric properties of the polynomials, resultants occurring in the test and by generalizing Sturm's method. The improved test can be fulfilled by a totally algebraic algorithm with a finite number of steps and the computational complexity is largely reduced as it involves only certain real variable polynomials with degrees not exceeding half of their previous complex variable counterparts. Nontrivial examples for 2D polynomials having both numerical and literal coefficients are also shown to illustrate the computational advantage of the proposed method.

• International Journal of Fluid Machinery and Systems
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• 제2권3호
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• pp.215-222
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• 2009

Jets issuing through small holes in a wall into a freestream has proven effective in the control of flow separation. This technique is known as the vortex generator jet (VGJs) method. If a precursor signal of separation is found, the separation control system using VGJs can be operated just before the onset of separation and the flow field with no separation is always attained. In this study, we measured the flow field and the wall static pressure in a two-dimensional diffuser to find a precursor signal of flow separation. The streamwise velocity measurements were carried out in the separated shear layer and spectral analysis was applied to the velocity fluctuations at some angles with respect to the diffuser. The pattern of peaks in the spectral analysis changes as the divergence angle increases over the angle of which the whole separation occurs. This change in the spectral pattern is related to the enhancement of the growth of shear layer vortices and appears just before the onset of separation. Therefore, the growth of shear layer vortices can be regarded as a precursor signal to flow separation.

• Asian review of World Histories
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• 제2권2호
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• pp.217-248
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• 2014

The Aid-India Consortium was organized in 1958 as an international scheme to support the economic development of India, and led by the World Bank. This article reconsiders the economic diplomacy of the Indian Government in the 1950s and 1960s, by paying attention to the interactions between the Indian authorities and the donor countries and institutions, in the context of the Cold War regime, decolonization and economic aid to the newly independent countries. First, it deals with the development of the Aid-India Consortium by considering debates at its annual meetings and the skillful negotiations of the Indian Government and financial authorities. It focuses especially on the leading role of an Indian diplomat and financial expert, B. K. Nehru. The article then tries to reveal an Indian initiative in solving the 'food crises' of 1965-67 through intimate collaboration with the US government and the World Bank, using the framework of the Aid-India Consortium. These attempts lead to a reconsideration of the economic order of Asia in the 1950s and 1960s.

• International Journal of Control, Automation, and Systems
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• 제3권4호
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• pp.631-639
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• 2005

In this paper, we propose a constructive realization procedure for 2D systems which may lead to a Fornasini-Marchesini local state-space model with much lower order than the existing realization procedure given by Bisiacco et al. Nontrivial examples are illustrated and the conditions for minimal realization are also discussed.

• International Journal of Precision Engineering and Manufacturing
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• 제9권4호
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• pp.11-15
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• 2008

Metrology tools with the ability to measure spindle motion error on the order of a nanometer are required due to recent advances in nanotechnology. We propose a direct measurement method for the radial motion error of a precision spindle using a regular crystalline lattice and a scanning tunneling microscope (STM). A highly oriented pyrolytic graphite (HOPG) crystal combined with an STM is used as a two-dimensional reference scale. The measurement principle and the preliminary experimental results are discussed in this article. The preliminary experimental results demonstrated that the proposed method has the capability to incorporate a two-dimensional encoder to measure the spindle motion error.

• International Journal of Human Ecology
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• 제3권1호
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• pp.127-136
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• 2002

According to the Labor Standard Law in Japan which was enacted after World War II in 1947, all work hours for adult men, women, and youth were set at a maximum of eight hours per day and forty-eight hours per week. In other words, a six-day work week, with only one-day off, was set. Now we are in the full five-day and two-day off school system. The five-day school week influences on our home life. Students are highly enthused by the new system, in looking forward to their personal time they now have to play with friends, to relax, or just watch TV. To implement this new five-day school system positively and effectively, we should see the point at issue related to the two-day off system from a different angle, which suggests that we should see far ahead into the future.