Kyushu International University
Okaya, Japan

Kyushu International University is a private university in Yahata Higashi, Kitakyushu, Fukuoka, Japan.The roots of the university can be found in the "Kyushu Law School", which was founded in 1930. The direct predecessor to the school, "Yahata University", was established in 1950, and it adopted the present name in 1989. Wikipedia.

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Shoudai T.,Kyushu International University | Matsumoto S.,Tokai University | Suzuki Y.,Hiroshima City University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

In this paper, we describe how distributional learning techniques can be applied to formal graph system (FGS) languages. An FGS is a logic program that deals with term graphs instead of the terms of first-order predicate logic. We show that the regular FGS languages of bounded degree with the 1-finite context property (1-FCP) and bounded treewidth property can be learned from positive data and membership queries. © Springer International Publishing AG 2017.

Nakanotani H.,Kyushu International University | Furukawa T.,Kyushu University | Hosokai T.,Japan National Institute of Advanced Industrial Science and Technology | Hatakeyama T.,Sanda University | Adachi C.,Kyushu International University
Advanced Optical Materials | Year: 2017

To reduce the threshold current density and move closer toward the realization of future current-injection organic semiconductor lasers, the harvesting of triplet excitons is anticipated because 75% excitons are directly formed as triplet excited states under electrical excitation according to spin statics. However, the observation of light amplification in pure phosphorescent or thermally activated delayed fluorescence (TADF) materials has nor yet been reported even under optical excitation. Herein, light amplification was observed in the TADF emitter 9-([1,1'-biphenyl]-3-yl)-N,N,5,11-tetraphenyl-5,9-dihydro-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracen-3-amine (DABNA-2). It is found that DABNA-2 possesses not only a large stimulated emission cross-section but also a favorable window for light amplification. These results indicate that TADF emitters can form a new category of laser dyes and are important candidates for the realization of an organic semiconductor laser. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Yoshida M.,Hokkaido University | Kondo M.,Japan Science and Technology Agency | Torii S.,Japan Institute for Molecular Science | Sakai K.,Kyushu International University | Masaoka S.,Japan Institute for Molecular Science
Angewandte Chemie - International Edition | Year: 2015

Rational molecular design of catalytic systems capable of smooth O-O bond formation is critical to the development of efficient catalysts for water oxidation. A new ruthenium complex was developed, which bears pendant SO3- groups in the secondary coordination sphere: [Ru(terpy)(bpyms)(OH2)] (terpy=2,2′:6′,2′′-terpyridine, bpyms=2,2′-bipyridine-5,5′-bis(methanesulfonate)). Water oxidation driven by a Ce4+ oxidant is distinctly accelerated upon introduction of the pendant SO3- groups in comparisons to the parent catalyst, [Ru(terpy)(bpy)(OH2)]2+ (bpy=2,2′-bipyridine). Spectroscopic, electrochemical, and crystallographic investigations concluded that the pendant SO3- groups promote the formation of an O-O bond via the secondary coordination sphere on the catalyst, whereas the influence of the pendant SO3- groups on the electronic structure of the [Ru(terpy)(bpy)(OH2)]2+ core is negligible. The results of this work indicate that modification of the secondary coordination sphere is a valuable strategy for the design of water oxidation catalysts. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhang Q.,Kyushu University | Tsang D.,i3 Electronics | Kuwabara H.,Kyushu University | Hatae Y.,Kyushu University | And 5 more authors.
Advanced Materials | Year: 2015

The design of efficient and concentration-insensitive metal-free thermally activateddelayed fluorescence (TADF) materials is reported. Blue and green organic light-emitting diodes (OLEDs) containing a hole-transport layer, an undoped TADF emissive layer, and an electron-transport layer achieve maximum external quantum efficiencies of 19%, which is comparable to the best doped OLEDs. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Three Ru(bpy)3 2+ derivatives tethered to multiple viologen acceptors, [Ru(bpy)2(4,4′-MV2)]6+, [Ru(bpy)2(4,4′-MV4)]10+, and [Ru(bpy)(4,4′-MV4)2]18+ [bpy=2,2′-bipyridine, 4,4′-MV2=4-ethoxycarbonyl-4′-(N-G1-carbamoyl)-2,2′-bipyridine, and 4,4′-MV4=4,4′-bis(N-G1-carbamoyl)-2,2′-bipyridine, where G1=Asp(NHG2)-NHG2 and G2=-(CH2)2-N+C5H4-C5H4N+-CH3] were prepared as "photo-charge separators (PCSs)". Photoirradiation of these complexes in the presence of a sacrificial electron donor (EDTA) results in storage of electrons per PCS values of 1.3, 2.7, and 4.6, respectively. Their applications in the photochemical H2 evolution from water in the presence of a colloidal Pt H2-evolving catalyst were investigated, and are discussed along with those reported for [Ru(bpy)2(5,5′-MV4)]10+, [Ru(4,4′-MV4)3]26+, and [Ru(5,5′-MV4)3]26+ (Inorg. Chem. Front. 2016, 3, 671-680). The PCSs with high dimerization constants (Kd=105-106m-1) are superior in driving H2 evolution at pH5.0, whereas those with lower Kd values (103-104m-1) are superior at pH7.0, where Kd=[(MV+)2]/[MV+ .]2. The (MV+)2 site can drive H2 evolution only at pH5.0 as a result of its 0.15eV lower driving force for H2 evolution relative to MV+ ., whereas the PCSs with lower Kd values exhibit higher performance at pH7.0 owing to the higher population of free MV+ .. Importantly, the rate of electron charging over the PCSs is linear to the apparent H2 evolution rate, and shows an intriguing quadratic dependence on the number of MV2+ units per PCS. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ishimatsu R.,Kyushu University | Edura T.,Kyushu University | Adachi C.,Kyushu International University | Nakano K.,Kyushu University | Imato T.,Kyushu University
Chemistry - A European Journal | Year: 2016

The photophysical properties and electrogenerated chemiluminescence (ECL) of three donor-acceptor molecules composed of dicyanobenzene and methyl-, tert-butyl-, and phenyl-substituted carbazolyl groups, 1,2,3,5-tetrakis(3,6-disubstituted-carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN-Me, 4CzIPN-tBu, and 4CzIPN-Ph, respectively) are described. These molecules show delayed fluorescence as a result of thermal spin upconversion from the lowest triplet state to the lowest singlet state at room temperature. The three molecules showed yellow to yellowish-red ECL. Remarkably, the ECL efficiencies of 4CzIPN-tBu in dichloromethane reached almost 40%. Moreover, stable ECL was emitted from 4CzIPN-tBu and 4CzIPN-Ph. In case of 4CzIPN-Me, the ECL intensity decreased during voltage cycles because of polymerization. Quantum chemical calculations revealed that polymerization was inhibited by the steric hindrance of the bulky tert-butyl and phenyl groups on the carbazolyl moieties and lowered the spin density on the carbazolyl groups through electron conjugation for 4CzIPN-Ph. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Hara S.,Kyushu University | Shoudai T.,Kyushu International University
Proceedings - 2014 IIAI 3rd International Conference on Advanced Applied Informatics, IIAI-AAI 2014 | Year: 2014

Formal graph system (FGS) is a logic program that deals with term graphs instead of the terms of first-order predicate logic. In this paper, we introduce context-deterministic (c-deterministic) regular FGSs as a subclass of FGSs and propose a polynomial time algorithm for learning the class of c-deterministic regular FGSs by using membership and equivalence queries in the framework of MAT learning. © 2014 IEEE.

Yamamoto K.,Kyushu International University
Science Reports of the Tohoku University, Series 7: Geography | Year: 2012

A certain type of cultural industry agglomerates in metropolises. Not only do the characteristics of the production structure influence this phenomenon, but so does the consumption structure of cultural product markets. This article contributes to an understanding of the agglomeration of a cultural industry by describing a segment of the spatial structure of the small theater performance market in Tokyo. In this study, we show the change in the spatial structure of Small Theater Performances from 1980 to 2010 by using the GIS technique, and we also explore the structure of this consumption space based on the results of a questionnaire survey given to audience members of theater performances as cultural consumers in Tokyo.

Oka Kenkai began practicing medicine in Shimonoseki following the conclusion of his training in western medicine in Nagasaki. He lived there from early spring in the 12th year of the Bunsei Era until mid-March of the following year. During that time, he wrote the "Oka-jyoyoho" and completed a translation of the "Seiki-ron". In addition, Kenkai established the school Seian-juku where he taught Western medicine to the approximately 20 students enrolled there. The school provided instruction not only in Westen medicine, but also other subjects such as the Dutch language and physiology. Notably, Kenkai enriched the field of basic medicine and regarded systematic understanding of academics as important. He came to Shimonoseki in part because of his distant relative SAKOU, who was an influential individual from a prominent Shimonoseki family and a devotee of Dutch culture. SAKOU hired Kenkai as the family physician so Kenkai could look after his personal residence and the honjin (the chief hotel of a post-town). Although Kenkai was only in Shimonoseki for a short year, he left behind exceptional achievements in medical education and literary works.

PubMed | Kyushu International University
Type: | Journal: Bioresource technology | Year: 2017

Pyruvate ferredoxin oxidoreductase from Citrobacter sp. S-77 (PFOR

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