Mimura M.,Meiji University |
Tohma M.,Momoyama Gakuin University
Ecological Complexity | Year: 2015
From the viewpoint of competitor-mediated coexistence, it is important to study the influence of an exotic species on other native species in terms of exogenous effects, in general, exotic species are weaker than native ones because they have evolved in a different environment. Even if an exotic species is weaker, however, it might cooperate with a native species, after which the competitive relations among native species may have reversed. This motivates us to consider the ecological situation whereby one exotic competing species invades the native system of two strongly competing species. Therefore, we discuss the problem of competitive exclusion or competitor-mediated coexistence using a three-species competition-diffusion system. © 2014 Elsevier B.V.
Contento L.,Meiji University |
Mimura M.,Meiji University |
Tohma M.,Momoyama Gakuin University
Japan Journal of Industrial and Applied Mathematics | Year: 2015
From the ecological point of view of competitor-mediated coexistence, we consider a three-species competition-diffusion system which models one exotic competing species W invading the native system of two strongly competing species U and V. Even if W is weaker than the native species, it is found that both competitive exclusion and competitor-mediated coexistence may occur, depending on the growth rate of W. Firstly, we show that there are two different planarly stable traveling waves involving the species (U, V) and (U, V, W), respectively. Studying the interaction of these waves in one dimension offers insight about whether or not coexistence occurs in two-dimensional domains. However, when planar fronts collide at a certain angle, phenomena which are not immediately reducible to the one-dimensional case can be observed, such as wedge-shaped patterns. In particular, the interaction between a radial and a planar front produces different types of moving patterns which seem to tend to truly two-dimensional traveling waves, such as wedge-, zipper- and biwedge-shaped traveling waves. All these waves arise from the interaction of stable planar fronts and their velocities can be computed by only knowing their asymptotic behaviour. We also show how such waves exist only if the angle between the planar fronts is under a certain critical value. © 2015, The JJIAM Publishing Committee and Springer Japan.
Nojiri W.,Momoyama Gakuin University |
Kaneko J.,University of Tsukuba |
Fujiwara T.,Japan Postal Service Co.
Geographical Review of Japan | Year: 2012
Especially since the oil crises, Japan's long-distance, wide-area Just-in-Time logistics systems have been established through mutual cooperation between completed-car manufacturers, parts suppliers, their logistics subsidiaries, and third-party logistics providers (3PL), against a background of a shift to diverse, flexible production, development of communication and information systems, and more dispersed locations of completed-car factories. Before the oil crises, during the medium- and long-distance transport of auto parts, longer transport times and distances tended to result in parts delivery delays, making it difficult to arrange space for storage and sorting. This in turn resulted in inefficient circulation of vehicles and staff and led to higher costs. In response to such problems, 3PL built logistics centers with vendor-consolidation and cross-dock functions, which made consolidation, trunk transport, sorting, and division into periodic, small-quantity, high-frequency deliveries possible. These initiatives boosted the circulation rates of vehicles and staff, which reduced transport time, parts delivery delays, transport costs, and storage space needed; clarified the flow of parts and information', and reduced wasteful processes and superfluous staff to achieve greater transport efficiency. In sum, these completed flexible logistics systems simultaneously achieved economy of scale in consolidated trunk transport and economy of scope with detailed sorting and frequent small-lot deliveries. As examples, we compare the Kumamoto Plant of Honda Motors and the Mizushima Plant of Mitsubishi Motors. In Honda Motors' logistics, costs are mainly borne by each supplier, with reliance on the suppliers' own initiatives. However, Honda provides indirect guidance and support, for example, it transports parts as backhaul cargo after completed-product transport, using 3PL company A. Honda thus developed diverse logistics using railway containers and ferry boats. On the other hand, Mitsubishi Motors pays the all costs of parts logistics to 3PL, and its logistics are greatly influenced by the existing 3PL prime contractor (company E), which developed an information system linking miscellaneous suppliers and many completed-car manufacturers. 3PL company E collects and consolidates numerous parts from each supplier for transport to Mitsubishi Motors using this common information system. We also compare 3PL companies A and E. Company A transports parts as backhaul cargo after completedproduct transport This 3PL focuses on logistics techniques. On the other hand, company E is a provider of a shared information system that links parts suppliers with many car assemblers. Thus company E has the marked characteristics of a 4PL.
Gaku R.,Momoyama Gakuin University |
Takakuwa S.,Chuo University
Proceedings - Winter Simulation Conference | Year: 2016
Using simulation technology, a procedure is proposed for a big data-driven service-level analysis for a real retail store. First, a data generator is designed to randomly select a sample of an expected number of customers or sampling data on a certain day from a large-scale dataset of sales predefined. Second, the clerk schedules are inputted into a data table created using Excel. Finally, simulation modeling mimics the service process of the retail store to examine and analyze the customer service level based on the selected data and the inputted clerk schedules. The proposed procedure for big data-driven service-level analysis shows the relations between the influencing service-level elements between the number of customers coming into stores, the frequency of customers, and the average customer service time. The procedure is generic and can easily be used to examine the service level in the remote past or to analyze and forecast the future. © 2015 IEEE.
Gaku R.,Momoyama Gakuin University
International Journal of Computational Intelligence Systems | Year: 2014
A procedure of demand forecasting using data mining techniques is proposed to forecast the sales amount of new short life-cycle products for an actual food processing enterprise. The enterprise annually produces 100~150 kinds of new items with short life-cycle between one week and three months to supply 260 convenience stores in the region of jurisdiction. Based on the previous delivery data in the first selling week, sales amount in the second, and the third selling weeks can be forecasted for their new products. Especially, some effective association rules about hot items and cold items are obtained by using data mining technologies for new short life-cycle products. © 2014 Copyright: the authors.
Ueno N.T.,University of Houston |
Ito T.D.,Momoyama Gakuin University |
Grigsby R.K.,American Association of Medical Colleges |
Black M.V.,University of Houston |
Apted J.,University of Houston
Nature Reviews Clinical Oncology | Year: 2010
The treatment of cancer requires that health care providers and caregivers from many disciplines work together on the intertwined physical, psychological, social and spiritual needs of oncology patients. Providing a conceptual framework explaining how the members of multidisciplinary oncology treatment teams may best interact with each other and the patient helps drive patient-centered care and clarifies the roles of specific team members at various times over the course of treatment. The ABC model of multidisciplinary care in cancer treatment describes the roles of the active caregivers (for example, physicians or nurses), basic supportive caregivers (for example, psychologists or chaplains) and community support (for example, advocacy groups or hospital staff) providing the full continuum of the cancer treatment experience. Teams trained in the ABC model should better understand the function and importance of each member's role, increase patient involvement and satisfaction with treatment, and ultimately improve patient outcomes. © 2010 Macmillan Publishers Limited. All rights reserved.
Ohmura S.,Momoyama Gakuin University |
Matsuo H.,Kobe University
International Journal of Production Economics | Year: 2016
The return policy is often used in retailing supply chains. However, it is controversial in judging their practical value. In the literature, various theoretical and modeling explanations of why the return policy is used in practice and is preferred by the retailer and manufacturer have been put forth. The literature focusing on the channel agents' risk attitudes to explain the adoption seems to have led to the conclusion that the two agents' preferences for adopting the full-return policy over the no-return policy are always in conflict, and thus the risk attitudes do not explain the adoption of return policy in practice. In this paper, we reinvestigate this issue. We first identify two distinct phases of risk averseness, high or low, for each of the two agents. We show distinct behaviors of how the wholesale price and order size are set in each phase. Then, we show that the full-return policy can be preferred over the no-return policy by both the agents if both of them are high risk averse. This implies that the agents' risk attitudes can explain the adoption of return policy. This is a new theoretical result, which is contrary to the existing understanding in the literature. Our result highlights the importance and intricacy of channel policies especially when the risk attitudes of agents are considered. © 2016 Elsevier B.V. All rights reserved.
Omura M.,Meiji Gakuin University |
Ebihara K.,Meiji Gakuin University |
Sakurai Y.,Momoyama Gakuin University
International Journal of Business and Globalisation | Year: 2016
This study examines the mechanism of an upward trend in wine consumption in Japan by analysing its trend and possible correlations with food-related consumptions. Through the panel and time-series analyses of wine consumption and food-item expenditures, and of wine consumption and food-service industry sales, we investigate whether wine consumption is correlated with food Westernisation in Japan and whether wine is gaining a firm place in Japanese daily life. Although the results are not robust, we find supporting evidence for both claims, particularly for the second claim. While on-premise consumption, particularly at reasonably priced diners, is estimated to be an important factor for growing wine consumption, there is possible evidence that home wine consumption is increasing. It is also suggested that reasonably priced wine, especially imported wine, is likely to be the key for future wine consumption in Japan. © 2016 Inderscience Enterprises Ltd.
Hoffberg S.L.,University of Georgia |
Bentley K.E.,University of Georgia |
Lee J.B.,University of Georgia |
Myhre K.E.,University of Georgia |
And 3 more authors.
Conservation Genetics Resources | Year: 2015
Kudzu (Pueraria montana var. lobata) is a perennial vine native to eastern Asia and an invasive in the United States, representing a significant threat to biodiversity. We characterized 15 polymorphic microsatellite loci in four populations from both the native and invasive ranges of kudzu. The number of alleles per locus ranged from 2 to 8 and observed heterozygosity ranged from 0.0 to 0.9. Consistent with vegetative reproduction, loci were initially not in Hardy–Weinberg equilibrium (HWE) and in linkage disequilibrium but when clones were removed, markers were in HWE and in linkage equilibrium. These loci provide valuable tools to study the diversity and invasion history of an important invasive species. © 2014, Springer Science+Business Media Dordrecht.
PubMed | Momoyama Gakuin University and University of Georgia
Type: Journal Article | Journal: Applications in plant sciences | Year: 2015
To facilitate population genetic analyses, microsatellite markers were developed for pokeweed (Phytolacca americana), a large, weedy, perennial herb native to eastern North America that is emerging as a significant invasive species in China.We mined 1,100,538 Illumina MiSeq reads from genomic DNA for microsatellites and identified 58 primer pairs. We screened these primers for polymorphism in two native and two invasive populations. We identified 11 loci that amplified consistently. The number of alleles per locus ranged from two to six, and observed heterozygosity ranged from 0.00 to 1.00. All loci were largely monomorphic within populations but different among populations. The primers were of very limited use in the congener P. acinosa.These loci will provide a valuable resource to study the population genetics and invasion history of P. americana.