Yun Y.S.,VARAVON Inc.811 Mecha Zone |
Emori H.,Shumei University |
Nakazawa K.,Tokyo Institute of Technology
Earth, Planets and Space | Year: 2013
The structures of the protoplanetary disk have been examined under various conditions of the stellar wind and the mass distribution of the disk, by assuming that the disk is steady and geometrically thick. T Tauri stars are commonly accompanied by disks as well as the stellar wind. Therefore, the disk around a T Tauri star should be influenced by the stellar wind. The height of the geometrical surface of the disk is suppressed by the dynamical pressure of the wind but depends very weakly on the wind strength. The surface becomes slightly higher when the wind strength becomes weaker. Furthermore, the dependency on the mass distribution of the disk is also weak. As a natural result, the temperature distribution in the disk is insensitive to the wind strength and also the mass distribution of the disk. Thus, we can conclude that the temperature and the geometrical surface height of the disk under the stellar wind does not depend on either the wind properties or the mass distribution of the disk. Copyright © The Society of Geomagnetism and Earth Planetary and Space Sciences (SGEPSS).
Morimoto E.,Tokushima University |
Arai K.,Shumei University
Resources, Environment and Engineering - 2nd Technical Congress on Resources, Environment and Engineering, CREE 2015 | Year: 2016
In the present study, we quantify the desired and actual bidding behaviour of Japanese companies by analysing public procurement data from three regional development bureaus. Our study extends the findings of Iwamatsu et al. (2013), who use a survey questionnaire to determine the desired bidding behaviour of major Japanese construction companies. To compare actual bidding behaviour with desired bidding, we model the probability of participation, which is regressed on the quantified values of the bidding data and other information. The results are then ranked, compared with those of Iwamatsu et al. (2013), and analysed. We focus on the factors on which firms concentrate when determining whether to participate in bidding. Although both Iwamatsu et al. (2013) and our study include widely used high-ranking items, in our analysis, ‘company circumstances’ are ranked highly at the participation stage. This offers practical justification for including competition circumstances when modelling real-world bidding behaviour. © 2016 Taylor & Francis Group, London.
Arai K.,Shumei University |
Morimoto E.,Tokushima University
Proceedings of the 32nd Annual ARCOM Conference, ARCOM 2016 | Year: 2016
This paper explores the presence, causes and effects of the economies of scope in the construction industry. From the cost efficiency viewpoint, the bid and win rates are regressed by factors, including the number segments in a public procurement, in which a construction business operates, using the public procurement data of the Hokkaido Regional Development Bureau from fiscal years 2006 to 2012. We found that the bid rates of diversified firms are higher than those of specialized firms. Therefore, the winning probability of a firm decreases as their number of operational segments increases.
Mitomo H.,Waseda University |
Otsuka T.,Shumei University
Telematics and Informatics | Year: 2012
In this study, some obstacles in using information and communication technology (ICT) for public relation activities regarding environmental protection are reviewed. While there are many ways of dispersing information on environmental hazards, people may not be very responsive. In this study, we hypothesize that the obstacles to effective information dispersion can be attributed to factors such as limited memory retention, projection bias, and urgency of the problem, which are major concepts of behavioral economics. An empirical survey supports this hypothesis and emphasizes the need to overcome these obstacles in order to improve the efficiency of dispersing information on the environment. © 2011 Elsevier Ltd. All rights reserved.
Murakami M.,Shumei University |
Murakami M.,Waseda University
Paleontological Research | Year: 2016
Inioidea, which consists of Iniidae and Pontoporiidae, includes only four extant species, all of which occur in South America. Inioids were, however, more diversified and widely distributed in the past, starting from the late middle Miocene, as recorded from the eastern Pacific, North and South Atlantic, North Sea and the riverine systems of South America. In this paper, the author describes a new extinct inioid, Awadelphis hirayamai gen. et sp. nov. (WU SILS G 408), from the uppermost Miocene Senhata Formation (6.3-5.7 Ma) of Chiba, central Japan. Morphological cladistic analysis supports placement of this new taxon within the Inioidea. The new species is characterized by a right premaxillary eminence with a pronounced overhang on the right maxilla and a short zygomatic process of the squamosal. This is the first fossil record of an inioid not only from Japan but also from the North Pacific. The discovery of this new taxon considerably extends the paleobiogeographic range of inioids, and indicates that inioids co-occurred with other small odontocetes of the western North Pacific, where delphinoids dominated. The new species is also the first valid occurrence of a small odontocete from tropical--subtropical climates of the late Miocene in the western North Pacific. © 2016 by the Palaeontological Society of Japan.
Otsuka T.,Shumei University |
Mitomo H.,Waseda University
Telecommunications Policy | Year: 2013
This paper aims to review the process of mobile phone operators agreeing to introduce mobile number portability (MNP) in Japan. A study group formed by the Ministry of Internal Affairs and Communications estimated the proportion of MNP users and analyzed the user benefits and associated costs to introduce MNP. Owing to the particular market structure and technology available, MNP was expected to yield a larger benefit in the Japanese mobile market than that seen in other countries. Based on the results of the research reviewed with respect to the market situation one year after introducing MNP, the increased competition in the mobile phone market was onfirmed by decreasing call charges and a reduction in the share of the dominant operator. © 2012 Elsevier Ltd.
Hirayama K.,University of Tokyo |
Okitsu T.,University of Tokyo |
Okitsu T.,Japan Science and Technology Agency |
Teramae H.,Shumei University |
And 6 more authors.
Biomaterials | Year: 2013
In bottom-up tissue engineering, a method to integrate a pathway of nutrition and oxygen into the resulting macroscopic tissue has been highly desired, but yet to be established. This paper presents a cellular building unit made from microstrand-shaped bacterial cellulose (BC microstrand) covered with mammalian cells. The BC microstrands are fabricated by encapsulating Acetobacter xylinum with a calcium alginate hydrogel microtube using a double co-axial microfluidic device. The mechanical strength and porous property of the BC microstrands can be regulated by changing the initial density of the bacteria. By folding or reeling the building unit, we demonstrated the multiple shapes of millimeter-scale cellular constructs such as coiled and ball-of-yarn-shaped structures. Histological analysis of the cellular constructs indicated that the BC microstrand served as a pathway of nutrition and oxygen to feed the cells in the central region. These findings suggest that our approach facilitates creating functional macroscopic tissue used in various fields such as drug screening, wound healing, and plastic surgery. © 2012 Elsevier Ltd.
Iizuka R.,Shumei University |
Kikuchi T.,Tokyo Metroplitan University
European Journal of Geography | Year: 2016
In the paradigm of post-production, food tourism is developing as a phenomenon of rural restructuring in some areas, especially in Western countries. The framework of food tourism is an expanded version of conventional rural tourism, which includes not only local food and gastronomy but also the culture and traditions of that area. In the last two decades, food tourism has attracted attention in various fields, including geography and tourism, as a form of sustainable tourism, making use of local resources. This paper uses a case study of tourism in Watou, a rural village in West Flanders, Belgium, to explore the relation between a traditional brewing culture and sustainable rural tourism. The research method consisted of gathering data through fieldwork, which included investigations of the distribution of tourist attractions and land use, and analysing the data from a geographical perspective. Through analysis and discussion, we found that in Watou there is a multiplex of food tourism, which consists of rural tourism, agritourism, slow food tourism and gastronomic tourism, and that tourists consume tourism resources, which are themed to the traditional brewing culture in each kind of tourism. The results show that food tourism in Watou, which connects these subareas with one another, leads to the preservation of rurality and to the sustainability and the revitalisation of the village. © Association of European Geographers.
Burgess A.,University of Kent |
Horii M.,Shumei University
Sociology of Health and Illness | Year: 2012
This article begins to develop an understanding of surgical mask-wearing in Japan, now a routine practice against a range of health threats. Their usage and associated meanings are explored through surveys conducted in Tokyo with both mask wearers and non-mask wearers. It contests commonly held cultural views of the practice as a fixed and distinctively Japanese collective courtesy to others. A historical analysis suggests that an originally collective, targeted and science-based response to public health threats has dispersed into a generalised practice lacking a clear end or purpose. Developed as part of the biomedical response to the Spanish flu of 1919, the practice resonated with folk assumptions as making a barrier between purity and pollution. But mask-wearing became socially embedded as a general protective practice only from the 1990s through a combination of commercial, corporate and political pressures that responsibilised individual health protection. These developments are usefully understood amidst the uncertainty created by Japan's 'second modernity' and the fracturing of her post-war order. Mask-wearing is only one form of a wider culture of risk; a self-protective risk ritual rather than a selfless collective practice. © 2012 The Authors. Sociology of Health & Illness © 2012 Foundation for the Sociology of Health & Illness/Blackwell Publishing Ltd.
Horii M.,Shumei University |
Burgess A.,University of Kent
Health, Risk and Society | Year: 2012
Women-only train carriages have been introduced in Japan as a response to widespread groping (chikan) by men. In August 2007, 155 young women completed a survey at a variety of locations in central Tokyo, mainly at the popular meeting places, Shinjuku and Shibuya. The survey involved face-to-face interviews conducted mainly by young female interviewers. The numbers involved are insufficient for rigorous statistical analysis and in this pilot study we were principally interested in further refining ideas and hypotheses for further investigation by considering results in the context of significant contemporary social trends. This article starts by considering a particular cultural context in which the issue of groping resulted in the introduction of women-only train carriages and this official antigroping measure which has been widely accepted. The article then examines women's responses to the availability of women-only train carriages, using surveys carried out in Tokyo. It concludes by considering the specific and anomalous targeting of primarily middle aged 'salarymen', a focus understood in the context of the collapse of the ideological power of the patriarchal corporate figure associated with the end of the Japanese economic miracle. Women's use and support for women-only train carriages is not solely dominated by anxiety over the risk of chikan. Our survey indicated that it was a symbolic rejection of a particular type of masculinity, rather than the physical separation from a risk of being groped. © 2012 Copyright Taylor and Francis Group, LLC.