Nishinippon Institute of Technology
Fukuoka, Japan

Nishinippon Institute of Technology is a private university in the city of Kitakyushu in Fukuoka Prefecture, Japan. It was established in 1967. Wikipedia.

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Kamei K.,Nishinippon Institute of Technology | Narumi K.,Nishinippon Institute of Technology | Shuto D.,Nishinippon Institute of Technology
Proceedings - 2016 Joint 8th International Conference on Soft Computing and Intelligent Systems and 2016 17th International Symposium on Advanced Intelligent Systems, SCIS-ISIS 2016 | Year: 2016

Recently, drones have been used for many purposes. The investigation of tree growth in a forest is also one of the expectations for drone applications. The aim of this paper is that a drone recognizes a color marker which is set to a tree from an image, and a drone approaches to that tree, and then return to the goal zone. To solve the task, we propose to apply the algorithm of Particle Filter for the color marker recognition. The difficulty of applying image processing at a forest is that degree of luminance changes drastically, due to incident light through the trees. To overcome this difficulty, we attempt the method to update the tracking color by a time period. From the results of experiments, our proposal has been able to deal with changes in luminance intensity, and then a drone with our proposal has solved a part of the task for competition. © 2016 IEEE.

Wilson D.W.,University of Newcastle | Abbo A.J.,University of Newcastle | Sloan S.W.,University of Newcastle | Yamamotob K.,Nishinippon Institute of Technology
Canadian Geotechnical Journal | Year: 2017

This paper investigates the stability of a plane strain rectangular tunnel under undrained conditions, where the shear strength profile increases linearly with depth. The undrained stability of tunnels for a range of geometries and soil conditions is found using rigid-block upper bound methods as well as finite element limit analysis (FELA). The latter procedures employ a discrete form of the bound theorems of classical plasticity to formulate an optimization problem that is solved using a bespoke conic programming scheme. Rigorous solutions, obtained using adaptive re-meshing of the finite element mesh, generally bracket the true collapse load with upper and lower bound solutions to within 2%. Results from the parametric study are summarized in the form of stability charts. © 2017, Canadian Science Publishing. All rights reserved.

Tachibana Y.,RIKEN | Tachibana Y.,Nishinippon Institute of Technology | Tachibana Y.,Sophia University | Hirano T.,Sophia University
Nuclear Physics A | Year: 2016

We study the hydrodynamic response to jet propagation in the expanding QGP and investigate how the particle spectra after the hydrodynamic evolution of the QGP reflect it. We perform simulations of the space-time evolution of the QGP in gamma-jet events by solving (3+1)-dimensional ideal hydrodynamic equations with source terms. Mach cone is induced by the jet energy deposition and pushes back the radial flow of the expanding background. Especially in the case when the jet passage is off-central one, the number of particles emitted in the direction of the push back decreases. This is the signal including the information about the formation of the Mach cone and the jet passage in the QGP fluid. © 2016 Elsevier B.V.

Hagihara Y.,Sophia University | Shobu T.,NTT Data | Hisamori N.,Sophia University | Suzuki H.,Sophia University | And 2 more authors.
ISIJ International | Year: 2012

The delayed fracture characteristics of V-bearing steel were evaluated using conventional strain rate test (CSRT) and the hydrogen absorption and desorption behaviors were studied with the specimens hydrogen- charged and then exposed to air of 30°C for up to 2.5 months. CSRT was carried out at two test sites, and nearly the same delayed fracture resistance was obtained for the V-bearing steel. The fracture appearance changed from quasicleavage to intergranular with increasing hydrogen content. The hydrogen content of the boundary between fracture appearances was approximately 4 mass ppm. The hydrogen introduced into the V-bearing steel was composed of a diffusible one which decreased in concentration in 24 h when exposed to air of 30°C, and two types (weakly and strongly) of trapped ones. The strongly trapped hydrogen remained in the specimen after 2.5 months of exposure in air. By analyzing the thermal desorption profiles with Gaussian function, the peak temperatures of these hydrogen types were 100°C, 167°C and 198°C, corresponding to diffusible, weakly and strongly trapped hydrogen, respectively. The hydrogen-charged specimens of more than 4 mass ppm were fractured in the intergranular mode. After exposure in air and the hydrogen content became less than 4 mass ppm, the fracture mode changed to quasicleavage. After recharging the hydrogen to more than 4 mass ppm, the fracture mode became intergranular again. © 2012 ISIJ.

Inoue T.,Nishinippon Institute of Technology | Itahashi T.,Showa University
2014 Joint 7th International Conference on Soft Computing and Intelligent Systems, SCIS 2014 and 15th International Symposium on Advanced Intelligent Systems, ISIS 2014 | Year: 2014

Blind source separation (BSS) is a method for recovering a set of source signals from the observation of their mixtures without any prior knowledge about the mixing process. On the other hand, a method that recovers only one source signal from the observation is called blind source extraction (BSE). The number of parameters needed to be estimated in BSE is smaller than that in BSS, thereby requiring less computational time. In this paper we show a new BSE algorithm and demonstrate that the algorithm can preserve a signal quality, which is one of the important features for applications, such as speech enhancement. Furthermore, we have showed that a unimodular constraint used in this study can eliminate the indeterminacy in numbering of the sources, which cannot be eliminated in other constraints proposed before. © 2014 IEEE.

Kamei K.,Nishinippon Institute of Technology | Nakano M.,Nishinippon Institute of Technology
2014 Joint 7th International Conference on Soft Computing and Intelligent Systems, SCIS 2014 and 15th International Symposium on Advanced Intelligent Systems, ISIS 2014 | Year: 2014

Recently, the researches that regard puzzle games as nonlinear optimization problems have been studied. The puzzles, which are N-Queen problem and Knapsack problem, are called NP-hard or NP-complete problem, hence the studies have been actively. On the other hand, there are a lot of puzzle game in the world, nevertheless many puzzle game have not been studied actively. In our research, we adopt 'Sudoku(Number Place)' puzzle. Sudoku is one of the combination puzzles of numbers. There are many local minima in Sudoku, and the overall optimum solution has to be determined by combination among local minima. Moreover, the solution between the overall optimum and the quasi-optimum are very similar. We propose to solve Sudoku based on Particle Swarm Optimization(PSO). The results are that PSO is able to only solve up to 15 blank grids. To overcome this difficulty, we propose to modify the exploration process that re-explore from another initial state if the solution is quasi-optimum. The improved PSO succeeded in solving in case of 17 blank grids. © 2014 IEEE.

Wang N.,Kyushu Institute of Technology | Yamaguchi T.,Kyushu Institute of Technology | Nishio K.,Nishinippon Institute of Technology
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals | Year: 2013

In order to reduce carbon emission, aluminum alloy has been being considered to get light weight car body in automotive industry. But it is difficult to obtain highly reliable joint of aluminum alloy and steel because of the production of hard and brittle intermetallic compounds during the welding process. In this study, aluminum alloys were welded to cold-rolling steel SPCC by resistance spot welding. Effects of welding conditions and alloy element Si, Cu and Mg in aluminum alloy on growth of intermetallic compounds at weld interfacial zones and weld strength of aluminum alloys/SPCC joints were investigated. The intermetallic compound layer was formed of Fe 2Al5 adhering to the steel and FeAl3 adhering to aluminum alloy, and the thickness varied with positions along the interface. From EBSD results, the Fe2Al5 layer has columnar grains which grew with the <001> direction perpendicular to the interface of spot welded joint. Diffusion of Si in aluminum alloy happened at the interface, which might inhibit the growth of intermetallic compounds, whereas diffusion of Mg and Cu was not found at the interface by EPMA analysis results. Hardness of intermetallic compound Fe2Al5 was affected by the diffusion of Si in aluminum alloy. The tensile shear strength of joint increased with the increasing of welding time, and the maximum tensile shear load was obtained at welding time of 0.134 s and 0.167 s. © 2013 The Japan Institute of Metals and Materials.

Zeng X.,Kyushu Institute of Technology | Yamaguchi T.,Kyushu Institute of Technology | Nishio K.,Nishinippon Institute of Technology
Surface and Coatings Technology | Year: 2015

The surface nitrocarburizing of a Ti-6Al-4V alloy was performed by YAG laser irradiation in a nitrogen and argon mixed gas flow. The optimal condition was investigated by varying the volume ratio of nitrogen in the mixed gas. The microstructure, chemical composition, hardness and wear behavior of the nitrocarburized Ti-6Al-4V alloy were analyzed. The results indicated that after surface nitrocarburizing, a double-layer composite film, for which the up layer was a Ti(C, N) layer and the down layer was a TiN0.3 layer, formed on the surface of the Ti-6Al-4V alloy. The observed cross sectional microstructure can be clearly divided into three parts: film, heat affected zone (HAZ) and unaffected substrate. When treated in a mixed gas flow of 70vol%N2 and 30vol% Ar, the optimal conditions were obtained with an average nano-indentation hardness of 41.6GPa and a wear volume loss of approximately 22 times less than that of the non-treated substrate. © 2014 Elsevier B.V.

Kamei K.,Nishinippon Institute of Technology | Kakizoe Y.,Nishinippon Institute of Technology
Proceedings - 2016 5th IIAI International Congress on Advanced Applied Informatics, IIAI-AAI 2016 | Year: 2016

Recently, the researches that create agents which play board games have been studied actively. According to those studies, those agents have abilities that are comparable to the strongest experts. However, it can be said that those agents depend on the computational capability because that abilities of those agents are realized by thousands of lookahead search. On theotherhand, humanbeingshavenoadvantagescomparedwith numerical capability of computers, however, experts sometimes defeat those agents. In contrast to other approaches, our purpose is to create the agent which requires only low computational capability but is strong, like human beings. To realize our aim, we have proposed to develop the agent based on Self-Organizing Maps and reinforcement learning. From the experimental results, the agent learned by MC-learning achieved a 58% winning rate against the adversary program, so that we have succeeded in improving the winning rate over 10%. © 2016 IEEE.

Gao F.,Nishinippon Institute of Technology
International Journal of Automation Technology | Year: 2015

A press die has a reciprocating motion with the movement of the press machine. There is a very strong force between the upper and lower die. Utilizing the reciprocating motion, the author’s laboratory developed a high-pressure air compression unit, which can be fixed inside a die set. The generated powerful air can successfully blow slugs that occur in punching from the die. Moreover, it can be used as an independent power source to perform auxiliary motions, such as material sheet feeding or second working on the products, during the pressing process. This study describes the development of the air compression unit; the experiment carried out to test slug removal; and provides the related reference data to promote the further deployment and application of this technology. © 2014, Fuji Technology Press. All rights reserved.

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