Fukuoka-shi, Japan

Chikushi Jogakuen University

www.chikushi-u.ac.jp
Fukuoka-shi, Japan

Chikushi Jogakuen University is a private women's college in Dazaifu, Fukuoka, Japan, established in 1988. Wikipedia.


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Rosli M.K.A.,National University of Malaysia | Syed-Shabthar S.M.F.,National University of Malaysia | Abdul-Patah P.,Km 10 | Abdul-Samad Z.,National University of Malaysia | And 9 more authors.
The Scientific World Journal | Year: 2014

Three species of otter can be found throughout Malay Peninsula: Aonyx cinereus, Lutra sumatrana, and Lutrogale perspicillata. In this study, we focused on the A. cinereus population that ranges from the southern and the east coast to the northern regions of Malay Peninsula up to southern Thailand to review the relationships between the populations based on the mitochondrial D-loop region. Forty-eight samples from six populations were recognized as Johor, Perak, Terengganu, Kelantan, Ranong, and Thale Noi. Among the 48 samples, 33 were identified as A. cinereus, seven as L. sumatrana, and eight as L. perspicillata. Phylogenetically, two subclades formed for A. cinereus. The first subclade grouped all Malay Peninsula samples except for samples from Kelantan, and the second subclade grouped Kelantan samples with Thai sample. Genetic distance analysis supported the close relationships between Thai and Kelantan samples compared to the samples from Terengganu and the other Malaysian states. A minimum-spanning network showed that Kelantan and Thailand formed a haplogroup distinct from the other populations. Our results show that Thai subspecies A. cinereus may have migrated to Kelantan from Thai mainland. We also suggest the classification of a new subspecies from Malay Peninsula, the small-clawed otter named A. cinereus kecilensis. © 2014 M. K. A. Rosli et al.


Ohmori M.,Chikushi Jogakuen University | Okamura K.,Kyushu University
International Conference on Information Networking 2011, ICOIN 2011 | Year: 2011

Generally speaking, APs of existing IEEE 802.11 wireless LAN system may be always turned on in many cases even though no STA is present. Such APs may consume unnecessary electricity and that means electricity consumption. In this paper, we propose "Green Wireless LAN System", which reduces electricity consumption by automatically turning on or off APs in accordance with presences of STAs. In the system, we propose how to detect presences of STAs, how to authenticate and authorize STAs and how to turn on or off an AP in order to maximize electricity conservation. Also, we implement the proposed system. Then, we experiment on it in order to clarify how long it takes that an STA associate with an AP and what cause its delay. In addition, we measure how much electricity APs consumes in the system. Finally, we simulate how much electricity consumption the proposed system can reduce based upon results of experiments and actual usages of the existing wireless LAN System. ©2011 IEEE.


Ichinose M.,Chikushi Jogakuen University | Iizuka M.,Kyushu Dental College | Kusumi J.,Kyushu University | Takefu M.,Saga University
Journal of Theoretical Biology | Year: 2013

Compensatory mutations are individually deleterious but appropriate combinations of mutants are harmless. For several models of compensatory molecular evolution, we consider the effects of back mutation. It is shown that the effects of back mutation on the rate of compensatory molecular evolution are weak. Further we estimate the values of selection parameter of deleterious single mutants for the models of compensatory molecular evolution both with and without back mutation using sequence data of folded RNA molecules and compare them with the previous results. © 2013 Elsevier Ltd.


Kusumi J.,Kyushu University | Ichinose M.,Chikushi Jogakuen University | Takefu M.,Saga University | Piskol R.,Stanford University | And 2 more authors.
Journal of Theoretical Biology | Year: 2016

Consider two sites under compensatory fitness interaction, such as a Watson-Crick base pair in an RNA helix or two interacting residues in a protein. A mutation at any one of these two sites may reduce the fitness of an individual. However, fitness may be restored by the occurrence of a second mutation at the other site. Kimura modeled this process using a two-locus haploid fitness scheme with two alleles at each locus. He predicted that compensatory evolution following this model is very rare unless selection against the deleterious single mutations is weak and linkage between the interacting sites is tight. Here we investigate the question whether the rate of compensatory evolution increases if we take the context of the two directly interacting sites into account. By "context", we mean the effect of neighboring sites in an RNA helix. Interaction between the focal pair of sites under consideration and the context may lead to so-called indirect compensation. Thus, extending Kimura's classical model of compensatory evolution, we study the effects of both direct and indirect compensation on the rate of compensatory evolution. It is shown that the effects of indirect compensation are very strong. We find that recombination does not slow down the rate of compensatory evolution as predicted by the classical model. Instead, compensatory substitutions may be relatively frequent, even if linkage between the focal interacting sites is loose, selection against deleterious mutations is strong, and mutation rate is low. We compare our theoretical results with data on RNA secondary structures from vertebrate introns. © 2015 Elsevier Ltd.


Sakaki Y.,Chikushi Jogakuen University
Shinrigaku kenkyu : The Japanese journal of psychology | Year: 2013

This study provides evidence for the organization of bilingual conceptual representations in terms of second-language proficiency and the similarity between the two languages. Two bilingual groups (Japanese-English and Japanese-Korean) of participants were assigned a free recall task with a category list. The list consisted of 36 items from different levels of typicality, which were presented in the first or second language. The occurrence of category clustering varied according to typicality for the two groups. Among Japanese-English participants, Japanese representations were better organized than English items for participants with less-proficient levels of English, but this changed to a semantic network between the two languages with increasing second-language proficiency. Conversely, Japanese-Korean bilinguals established a semantic network with the two languages even at the beginner level with the second language. These findings indicate that both similarity between languages and second-language proficiency exert a strong effect in constructing a network in conceptual systems.


PubMed | Chikushi Jogakuen University
Type: | Journal: Journal of theoretical biology | Year: 2013

Compensatory mutations are individually deleterious but appropriate combinations of mutants are harmless. For several models of compensatory molecular evolution, we consider the effects of back mutation. It is shown that the effects of back mutation on the rate of compensatory molecular evolution are weak. Further we estimate the values of selection parameter of deleterious single mutants for the models of compensatory molecular evolution both with and without back mutation using sequence data of folded RNA molecules and compare them with the previous results.


PubMed | Ludwig Maximilians University of Munich, Stanford University, Saga University, Chikushi Jogakuen University and Kyushu University
Type: | Journal: Journal of theoretical biology | Year: 2015

Consider two sites under compensatory fitness interaction, such as a Watson-Crick base pair in an RNA helix or two interacting residues in a protein. A mutation at any one of these two sites may reduce the fitness of an individual. However, fitness may be restored by the occurrence of a second mutation at the other site. Kimura modeled this process using a two-locus haploid fitness scheme with two alleles at each locus. He predicted that compensatory evolution following this model is very rare unless selection against the deleterious single mutations is weak and linkage between the interacting sites is tight. Here we investigate the question whether the rate of compensatory evolution increases if we take the context of the two directly interacting sites into account. By context, we mean the effect of neighboring sites in an RNA helix. Interaction between the focal pair of sites under consideration and the context may lead to so-called indirect compensation. Thus, extending Kimuras classical model of compensatory evolution, we study the effects of both direct and indirect compensation on the rate of compensatory evolution. It is shown that the effects of indirect compensation are very strong. We find that recombination does not slow down the rate of compensatory evolution as predicted by the classical model. Instead, compensatory substitutions may be relatively frequent, even if linkage between the focal interacting sites is loose, selection against deleterious mutations is strong, and mutation rate is low. We compare our theoretical results with data on RNA secondary structures from vertebrate introns.


PubMed | Chikushi Jogakuen University
Type: Journal Article | Journal: Shinrigaku kenkyu : The Japanese journal of psychology | Year: 2013

This study provides evidence for the organization of bilingual conceptual representations in terms of second-language proficiency and the similarity between the two languages. Two bilingual groups (Japanese-English and Japanese-Korean) of participants were assigned a free recall task with a category list. The list consisted of 36 items from different levels of typicality, which were presented in the first or second language. The occurrence of category clustering varied according to typicality for the two groups. Among Japanese-English participants, Japanese representations were better organized than English items for participants with less-proficient levels of English, but this changed to a semantic network between the two languages with increasing second-language proficiency. Conversely, Japanese-Korean bilinguals established a semantic network with the two languages even at the beginner level with the second language. These findings indicate that both similarity between languages and second-language proficiency exert a strong effect in constructing a network in conceptual systems.


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