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Article
Publication date: 1 September 2004

Shinichi Yamaguchi, Akihiro Daikoku and Norio Takahashi

This paper describes the cogging torque of the permanent magnet synchronous (PM) motors due to the magnetic anisotropy of motor core. The cogging torque due to the…

Abstract

This paper describes the cogging torque of the permanent magnet synchronous (PM) motors due to the magnetic anisotropy of motor core. The cogging torque due to the magnetic anisotropy is calculated by the finite element method using two kinds of modeling methods: one is the 2D magnetization property method, and the other is the conventional method. As a result, the PM motors with parallel laminated core show different cogging torque waveform from the PM motors with the rotational laminated core due to the influence of the magnetic anisotropy. The amplitudes of the cogging torque are different depending on the modeling methods in the region of high flux density.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 23 no. 3
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 14 December 2018

Shinya Hanaoka

This chapter examines the issues of the low-cost carriers (LCCs) in Japan and their impact on the domestic and international aviation markets. “Genuine” LCCs, such as…

Abstract

This chapter examines the issues of the low-cost carriers (LCCs) in Japan and their impact on the domestic and international aviation markets. “Genuine” LCCs, such as Peach Aviation and Jetstar Japan, began their operations in 2012 to follow the new movement of low-cost and low-fare airlines, which are different from the “new emerging” airlines, such as Skymark and AIRDO that appeared in the late 1990s. We discuss the recent history of LCCs in Japan, the characteristics of each LCC, the competitiveness of the high-speed railway in the domestic market, the impact of open sky policies, and the contribution of inbound foreign visitors to the international passenger volume increase. As LCCs in Japan have recently begun operations, they can continue to play a significant role in the Japanese aviation market.

Details

Airline Economics in Asia
Type: Book
ISBN: 978-1-78754-566-3

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Article
Publication date: 9 October 2017

David Martín-Moncunill, Miguel Angel Sicilia-Urban, Elena García-Barriocanal and Christian M. Stracke

The common understanding of generalization/specialization relations assumes the relation to be equally strong between a classifier and any of its related classifiers and…

Abstract

Purpose

The common understanding of generalization/specialization relations assumes the relation to be equally strong between a classifier and any of its related classifiers and also at every level of the hierarchy. Assigning a grade of relative distance to represent the level of similarity between the related pairs of classifiers could correct this situation, which has been considered as an oversimplification of the psychological account of the real-world relations. The paper aims to discuss these issues.

Design/methodology/approach

The evaluation followed an end-user perspective. In order to obtain a consistent data set of specialization distances, a group of 21 persons was asked to assign values to a set of relations from a selection of terms from the AGROVOC thesaurus. Then two sets of representations of the relations between the terms were built, one according to the calculated concept of specialization weights and the other one following the original order of the thesaurus. In total, 40 persons were asked to choose between the two sets following an A/B test-like experiment. Finally, short interviews were carried out after the test to inquiry about their decisions.

Findings

The results show that the use of this information could be a valuable tool for search and information retrieval purposes and for the visual representation of knowledge organization systems (KOS). Furthermore, the methodology followed in the study turned out to be useful for detecting inconsistencies in the thesaurus and could thus be used for quality control and optimization of the hierarchical relations.

Originality/value

The use of this relative distance information, namely, “concept specialization distance,” has been proposed mainly at a theoretical level. In the current experiment, the authors evaluate the potential use of this information from an end-user perspective, not only for text-based interfaces but also its application for the visual representation of KOS. Finally, the methodology followed for the elaboration of the concept specialization distance data set showed potential for detecting possible inconsistencies in KOS.

Details

Online Information Review, vol. 41 no. 6
Type: Research Article
ISSN: 1468-4527

Keywords

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