Ogaki, Japan
Ogaki, Japan

Gifu Keizai University is a private university at Ogaki, Gifu, Japan, founded in 1967. Wikipedia.

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Kume M.,Japan Aqua Restoration Research Center | Kitano J.,Fred Hutchinson Cancer Research Center | Mori S.,Gifu Keizai University | Shibuya T.,Akkeshi Waterfowl Observation Center
Journal of Evolutionary Biology | Year: 2010

When two closely related species migrate to divergent spawning sites, divergent use of spawning habitats can directly reduce heterospecific mating. Furthermore, adaptations to divergent spawning habitats can promote speciation as a by-product of ecological divergence. Here, we investigated habitat isolation and ecological divergence between two anadromous forms of threespine stickleback (Gasterosteus aculeatus), the Japan Sea and Pacific Ocean forms. In several coastal regions of eastern Hokkaido, Japan, these forms migrate to the same watershed to spawn. Our field surveys in a single watershed revealed that segregation of distinct spawning sites between the two forms was maintained within the watershed across multiple years. These spawning sites diverged in salinity and predator composition. Morphological and physiological divergence between the forms also occurs in the direction predicted by ecological differences between the spawning sites. Our data indicate that migration into divergent spawning habitats can be an important mechanism contributing to speciation and phenotypic divergence in anadromous fishes. © 2010 The Authors. Journal Compilation © 2010 European Society For Evolutionary Biology.

Natsumeda T.,Chiba Institute of Science | Mori S.,Gifu Keizai University | Yuma M.,Ryukoku University
Journal of Ethology | Year: 2012

Despite growing evidence for plasticity in the mating patterns of nest-holding animals in relation to the changes in nest abundance, the effects of aggressive interaction by dominant males on nest availability for conspecific rivals remains unclear. To quantify the effects of male-male competition on nest-site choice and mating success of the male Japanese fluvial sculpin Cottus pollux, we conducted experiments on 5 males from different 5 size classes under both sufficient and shortage nest-abundance conditions. Nest-choice experiments showed that both male size class and nest-abundance condition had significant effects on the nesting rates of males. Following the nest-choice experiments, 10 gravid females were added in the experimental tanks. Mating experiments revealed that male size, nesting rate before addition of females, and the number of courtship attempts on females were valid variables of male mating success, regardless of nest-abundance conditions. After achieving initial mating success, the largest nesting male exhibited more frequent aggressive interaction with other conspecific males than he did before obtaining eggs in his nest. Our results suggest that size-mediated dominance and aggressive behavior of males may disrupt nest acquisition of other conspecific males, and may consequently result in extreme variation in mating success among males even under sufficient nest-abundance conditions. © 2011 Japan Ethological Society and Springer.

Sugihara K.,Gifu Keizai University
SIGGRAPH Asia 2011 Sketches, SA'11 | Year: 2011

A 3-D city model as shown in Figure 1 is important in several fields, such as urban planning and gaming industries. However, enormous time and labour has to be consumed to create these 3-D models, using 3-D modeling softwares such as 3ds Max or SketchUp. For example, when manually modeling a house with roofs by Constructive Solid Geometry (CSG), one must use the following laborious steps: (1) Generation of primitives of appropriate size, such as box, prism or polyhedron that will form parts of a house (2) Boolean operations are applied to these primitives to form the shapes of parts of a house such as making holes in a building body for doors and windows (3) Rotation of parts of a house (4) Positioning of parts of a house (5) Texture mapping onto these parts.

Kitano J.,National Institute of Genetics | Mori S.,Gifu Keizai University
Genes and Genetic Systems | Year: 2016

Stickleback fishes have been established as a leading model system for studying the genetic mechanisms that underlie naturally occurring phenotypic diversification. Because of the tremendous diversification achieved by stickleback species in various environments, different geographical populations have unique phenotypes and genotypes, which provide us with unique opportunities for evolutionary genetic research. Among sticklebacks, Japanese species have several unique characteristics that have not been found in other populations. The sympatric marine threespine stickleback species Gasterosteus aculeatus and G. nipponicus (Japan Sea stickleback) are a good system for speciation research. Gasterosteus nipponicus also has several unique characteristics, such as neo-sex chromosomes and courtship behaviors, that differ from those of G. aculeatus. Several freshwater populations derived from G. aculeatus (Hariyo threespine stickleback) inhabit spring-fed ponds and streams in central Honshu and exhibit year-round reproduction, which has never been observed in other stickleback populations. Four species of ninespine stickleback, including Pungitius tymensis and the freshwater, brackish water and Omono types of the P. pungitius-P. sinensis complex, are also excellent model systems for speciation research. Anthropogenic alteration of environments, however, has exposed several Japanese stickleback populations to the risk of extinction and has actually led to extinction of several populations and species. Pungitius kaibarae, which is endemic to East Asia, used to inhabit Kyoto and Hyogo prefectures, but is now extinct. Causes of extinction include depletion of spring water, landfill of habitats, and construction of river-mouth weirs. Here, we review the importance of Japanese sticklebacks as genetic resources, the status of several endangered stickleback populations and species, and the factors putting these populations at risk. © 2016, Genetics Society of Japan. All rights reserved.

Sugihara K.,Gifu Keizai University
21st International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2013 - Communication Papers Proceedings | Year: 2013

3D urban models are important in several fields, such as urban planning and gaming industries. However, enormous time and labor has to be consumed to create these 3D models, using a 3D modeling software such as 3ds Max or SketchUp. In order to automate laborious steps, a GIS and CG integrated system is proposed for automatically generating 3D building models, based on building polygons (building footprints) on digital maps. Digital maps shows most building polygons' edges meet at right angles (orthogonal polygon). In the digital map, however, not all building polygons are orthogonal. In either orthogonal or non-orthogonal polygons, the new system is proposed for automatically generating 3D building models with general shaped roofs by straight skeleton computation. In this paper, the algorithm for shrinking a polygon and forming a straight skeleton are clarified and, the new methodology is proposed for constructing roof models by assuming 'the third event' and, at the end of the shrinking process, the shrinking polygon is converged to 'a line of convergence'.

Nakanishi N.,Gifu Keizai University
Differential Geometry and its Application | Year: 2011

We investigate the relation between linear Nambu algebras of order 3 and finite dimensional Lie 3-algebras with invariant metric. © 2011 Elsevier B.V.

Kitano J.,National Institute of Genetics | Ishikawa A.,National Institute of Genetics | Kume M.,Gifu Keizai University | Mori S.,Gifu Keizai University
Ichthyological Research | Year: 2012

Closely related species of fish often exhibit different migration patterns. Even within species, anadromous and resident populations can be found in a diverse number of taxa. Although several environmental factors that regulate behavioral and physiological changes associated with fish migration have been identified, the genetic mechanisms underlying the variation in the ability to respond to these environmental cues in fishes that show different migratory behaviors are not well known. The three-spined stickleback Gasterosteus aculeatus (Linnaeus 1758) is a good model system for elucidation of the genetic basis for variation in migratory behaviors and other physiological changes associated with migration. First, the three-spined stickleback exhibits great inter-population variation in migration patterns. Second, genetic and genomic tools are now available for studying this species. In the present study, variation in the migration patterns among G. aculeatus populations and the recent progress in our understanding of the genetic and physiological basis for variation in traits important for G. aculeatus migration are reviewed. © 2012 The Ichthyological Society of Japan.

Sugihara K.,Gifu Keizai University | Kikata J.,Kagoshima University
Journal of Computing in Civil Engineering | Year: 2013

A three-dimensional (3D) urban model is an important information infrastructure that can be utilized in several fields, such as urban planning and game industries. However, enormous time and effort have to be spent to create 3D urban models using 3D modeling software. This paper employs automatic generation of 3D building models through integrating geographic information systems (GIS) and computer graphics. An integrated system is proposed for automatically creating 3D building models from building polygons (building footprints) on a digital map. Because most building polygons' edges meet at a right angle (orthogonal polygon), the integrated system partitions orthogonal building polygons into a set of rectangles and places rectangular roofs and box-shaped building bodies on these rectangles. In this research, a new scheme for partitioning complicated orthogonal building polygons is proposed. In the digital map, however, not all building polygons are orthogonal. To place parts of a building properly, in either orthogonal or nonorthogonal polygons, the proposed system places parts of a building, such as windows along the inner contour, which is set back from the original building polygon by straight skeleton computation. For a multiple-bounded polygon (a building polygon bounded by outer polygons), a new scheme is also presented for creating a complicated building-shape model or a multilayer building. © 2013 American Society of Civil Engineers.

Sugihara K.,Gifu Keizai University | Shen Z.,Kanazawa University
2016 3rd MEC International Conference on Big Data and Smart City, ICBDSC 2016 | Year: 2016

City models by 3D CG (Computer Graphics) are important in promoting public participation for smart city, which will use solar photovoltaic (PV) generation. But, creating city models are labor intensive. In order to automate laborious steps, we proposed new technology by integration of a GIS (Geographic Information System) and CG. The proposed integrated system automatically generates 3D building models, based on building polygons or building footprints on digital maps, which show most building polygons' edges meet at right angles (orthogonal polygon). A complicated orthogonal polygon can be partitioned into a set of rectangles. The proposed integrated system partitions orthogonal building polygons into a set of rectangles and places rectangular roofs and box-shaped building bodies on these rectangles. In this paper, we propose to automatically generate 3D building models topped with double shed roofs attached by PV arrays. The sizes and positions, slopes of roof boards and under roof constructions are made clear by designing the top view and side view of a double shed roof house. For the application example of the developed system, we simulate the solar photovoltaic generation change of a city block by performing land readjustment and changing shape of buildings, that is, ordinary roof house or double shed roof house suitable for greater PV generation. Our simulation reveals that double shed roof houses have greatly improved the solar photovoltaic generation. © 2016 IEEE.

Kitano J.,Tohoku University | Kitano J.,Japan Science and Technology Agency | Kitano J.,Fred Hutchinson Cancer Research Center | Lema S.C.,University of North Carolina at Wilmington | And 8 more authors.
Current Biology | Year: 2010

During adaptive radiations, animals colonize diverse environments, which requires adaptation in multiple phenotypic traits [1]. Because hormones mediate the dynamic regulation of suites of phenotypic traits [2-4], evolutionary changes in hormonal signaling pathways might contribute to adaptation to new environments. Here we report changes in the thyroid hormone signaling pathway in stream-resident ecotypes of threespine stickleback fish (Gasterosteus aculeatus), which have repeatedly evolved from ancestral marine ecotypes [5-8]. Stream-resident fish exhibit a lower plasma concentration of thyroid hormone and a lower metabolic rate, which is likely adaptive for permanent residency in small streams. The thyroid-stimulating hormone-β2 (TSHβ2) gene exhibited significantly lower mRNA expression in pituitary glands of stream-resident sticklebacks relative to marine sticklebacks. Some of the difference in TSHβ2 transcript levels can be explained by cis-regulatory differences at the TSHβ2 gene locus. Consistent with these expression differences, a strong signature of divergent natural selection was found at the TSHβ2 genomic locus. By contrast, there were no differences between the marine and stream-resident ecotypes in mRNA levels or genomic sequence in the paralogous TSHβ1 gene. Our data indicate that evolutionary changes in hormonal signaling have played an important role in the postglacial adaptive radiation of sticklebacks. © 2010 Elsevier Ltd All rights reserved.

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