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Hachinohe, Japan

Hachinohe Institute of Technology is a private university located in the in city of Hachinohe, Aomori Prefecture, Japan, established in 1972. Wikipedia.


Sasahara T.,Hachinohe Institute of Technology
Journal of Geometry and Physics | Year: 2010

We classify biminimal Lagrangian surfaces in complex space forms under the condition that the integral curves of Maslov vector field are geodesics. © 2010 Elsevier B.V. Source


Takahashi R.,Hachinohe Institute of Technology
Electronics and Communications in Japan | Year: 2010

In order to efficiently obtain an approximate solution of the traveling salesman problem (TSP), the use of extended changing crossover operators (ECXO) which can substitute for any crossover operator of genetic algorithms (GAs) and ant colony optimization (ACO) for another crossover operator at any time is proposed. In this investigation, ECXO uses both ACO or edge recombination crossover (EX) and edge exchange crossover (EXX) in the early generations in order to create local optimum subpaths, and it uses edge assembly crossover (EAX) to create a global optimum solution after a certain number of generations. In EX or ACO any individual or any ant determines the next city it visits from the lengths of the edges or the amounts of pheromone deposited on the edges, where the pheromone indicates the lengths of tours that other ants have completed, thus generating local optimum paths. In EXX, the generated paths converge to a provisional optimal path. In EAX, a parent exchanges edges with another parent to create subcyclic paths, before restructuring the total cyclic path by combining the subcyclic paths so as to minimize the distances between them. In this paper the validity of ECXO is experimentally verified by using medium-sized problems from TSPLIB, and it is shown that ECXO can find the best solution earlier than EAX. © 2010 Wiley Periodicals, Inc. Source


Shibata K.,Hachinohe Institute of Technology
IEICE Transactions on Electronics | Year: 2010

Various studies of specific absorption rates (SARs) using liquid phantoms imitating human body tissues have been widely carried out in electromagnetic compatibility (EMC) research fields. In order to establish accurate SARs for measurement, a faithful mockup of human body tissue is needed. Therefore, knowledge of the accurate measurement of sample materials with high permittivity and high loss is very important. In this study, the complex permittivity of tap water, ethanol, methanol and isopropanol is measured by the open-ended cut-off circular waveguide reflection method. The effectiveness of the method presented here of measuring a liquid phantom with high-permittivity and high-loss is also confirmed by comparing the measured results with the results obtained by the TM010 circular cavity resonator method. At this time, the effects on the input impedance under variations of the insertion length and termination conditions were studied. Then the complex permittivity of tap water, ethanol, methanol and isopropanol was measured at frequencies ranging from 0.5 to 3.0 GHz using the measurement procedure above. As a result, we confirmed the frequency characteristics of the complex permittivity for a wide variety of high-loss liquid materials. © 2010 The Institute of Electronics, Information and Communication Engineers. Source


Takahashi R.,Hachinohe Institute of Technology
Proceedings - 10th International Conference on Machine Learning and Applications, ICMLA 2011 | Year: 2011

The subject of the Genetic Algorithm (GA) is to devise methodologies that can efficiently locate the optimum solution which must satisfy the contrary requirements of preserving population diversity and speeding up convergence on the optimum solution. In this paper, a new hybrid method iterative Extended Changing Crossover Operators (i-ECXO) combining Edge Assembly Crossover (EAX) and Ant Colony Optimization (ACO) is proposed to solve the Traveling Salesman Problem (TSP). In EAX, parent A's edge EA is exchanged for parent B's edge EB finally to generate new off spring, where EA and EB alternate in forming so-called A-B cycles. ACO simulates swarm intelligence in ants' feeding behavior. In ACO, ants tend to create various kinds of cyclic paths with different sequences of visiting cities in early stage of generations. In this paper, the diversity of generations is strictly measured by the entropy H in Thermo Dynamical Genetic Algorithm (TDGA). With the measure H, the validity of i-ECXO is experimentally verified by using medium sized TSP data. © 2011 IEEE. Source


Shibata K.,Hachinohe Institute of Technology
Progress in Electromagnetics Research Symposium | Year: 2014

Various studies on specific absorption rates (SARs) have been carried out with liquid phantoms representing human body tissues in the field of electromagnetic compatibility (EMC) research. As a faithful representation of human body tissue is needed to establish an accurate SAR for measurement, knowledge regarding the precise measurement of sample materials with high permittivity and high loss is very important. In this study, the complex permittivity of a liquid phantom material was measured using the open-ended cut-off circular waveguide reflection method. The effectiveness of the proposed approach for measuring a liquid phantom with high permittivity and high loss was also confirmed by comparing the measurement results with those obtained using the TM010 circular cavity resonator method. Source

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