Ishinomaki, Japan

Ishinomaki Senshu University
Ishinomaki, Japan

Ishinomaki Senshu University , an affiliated university of Senshu University, is a private university in Ishinomaki, Miyagi, Japan, established in 1989. The predecessor Senshu University was founded in 1880. Wikipedia.

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Shimabukuro K.,University of Ryukyus | Kameyama M.,Ishinomaki Senshu University
Proceedings of The International Symposium on Multiple-Valued Logic | Year: 2017

This paper presents a novel bit-serial fine-grain pipelined reconfigurable VLSI architecture based on multiplexer logic to achieve high utilization of hardware resources and high throughput. A basic cell is constructed by a logic block composed of a 2-data-input multiplexer and a switch box for data transfer between adjacent logic blocks by 8-near neighborhood mesh network. A multiplexer merged with a latch function is effectively employed for efficient fine-grain pipelined operation. A systematic mapping method for pipelined bit-serial operations is proposed using a data flow graph. As an extension of the reconfigurable VLSI based on the binary multiplexer logic, we introduce linear summation in the data transfer between logic blocks. A 4-valued multiplexer directly controlled by the linear sum can be effectively utilized to reduce complexity of the switch box. © 2017 IEEE.

Sampei M.,Laval University | Sasaki H.,Ishinomaki Senshu University | Forest A.,Laval University | Fortier L.,Laval University
Limnology and Oceanography | Year: 2012

In the Arctic Ocean, vertical fluxes of particulate organic carbon (POC) remain low during the dark winter period because POC fluxes are derived from photosynthetic production. Passively sinking dead copepods are traditionally excluded from POC fluxes estimated using sediment traps, resulting in the underestimation of the total POC flux. Here, we present the seasonal variability of total POC export flux measured by a sediment trap moored at, 100 m in the Amundsen Gulf (southeastern Beaufort Sea) over October 2007-July 2008. Surprisingly, the integrated total POC flux for February (466 mg m-2) was the second highest flux during the study period (the highest was in Jul; 1015 mg C m-2) due to a contribution of 91% from sinking dead copepods. The total POC flux in February 2008 in the Amundsen Gulf was up to two orders of magnitude higher than the previously reported traditional POC winter fluxes that did not include the contribution of sinking dead copepods. Hence, the POC flux in February only could be equivalent to ~ 18% of the quasi-annual traditional POC flux. Our observations suggest that a substantial POC export flux occurred during winter 2007-2008 due to zooplankton life cycle. © 2012, by the Association for the Sciences of Limnology and Oceanography, Inc.

Nakagomi S.,Ishinomaki Senshu University | Momo T.,Ishinomaki Senshu University | Takahashi S.,Ishinomaki Senshu University | Kokubun Y.,Ishinomaki Senshu University
Applied Physics Letters | Year: 2013

A deep Ultraviolet (UV) photodiode was fabricated using a heterojunction between β-Ga2O3 with a band gap of 4.9 eV, and 6H-SiC with a band gap of 3.02 eV, and investigated its UV sensitivity. A thin β-Ga2O3 layer (200 nm) was prepared on a p-type 6H-SiC substrate through gallium evaporation in oxygen plasma. The device showed good rectifying properties. Under reverse bias, the current increased linearly with increasing deep-UV light intensity. The responsivity of the photodiode was highest to deep-UV light below a wavelength of 260 nm. The photodiode's response time to deep-UV light was in the order of milliseconds. © 2013 AIP Publishing LLC.

Takahashi Y.,Ishinomaki Senshu University | Yamazaki T.,Ishinomaki Senshu University
Fuel | Year: 2012

A mesoporous Pt/SO-ZrO 2 catalyst was prepared by combining sol-gel and surfactant-assisted templating methods. Its pore structure was analyzed by an adsorption technique, and its catalytic behavior in the CH 4/CO 2 reforming reaction was investigated using a high-pressure flow reactor at 0.1-1.0 MPa and 803 K. The Pt/SO-ZrO 2 catalyst's surface consists of many mesopores; these yielded a high specific surface area (ca. 130 m 2/g) and a high Pt dispersion, which was three times that of Pt/ZrO 2 prepared by a conventional method. H 2 formation activity over the Pt/SO-ZrO 2 catalyst at 0.1-1.0 MPa was higher than that over Pt/ZrO 2, and the H 2/CO ratio also increased. At a gas hourly space velocity of 60,000 h -1 at 1.0 MPa, the catalytic stability was improved owing to high resistance to coking, and the H 2 space-time yield reached 93 mmol/h g cat. © 2012 Elsevier Ltd. All rights reserved.

Fukushima M.,Ishinomaki Senshu University | Chatt A.,Dalhousie University
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

An epi-thermal instrumental neutron activation analysis (EINAA) method in conjunction with Compton suppression spectrometry (EINAA-CSS) was used for the determination of total iodine in eight different species of edible seaweeds from Japan. This method gave an absolute detection limit of about 2 μg. The accuracy of the method was evaluated using various reference materials and found to be generally in agreement within ±6% of the certified values. The longitudinal distributions of iodine at different growing stages in Japanese sea mustard and tangle seaweeds were investigated. For a 150-cm-high tangle, the highest concentration (5,360 mg/kg) of iodine was found at the root, then decreased slowly to 780 mg/kg in the middle portion (60-75 cm), and increased to 2,300 mg/kg at the apex. On the other hand, for a 190-cm-high sea mustard the highest levels of iodine were found both at the roots (164 mg/kg) and apex (152 mg/kg) with lower values (98 mg/kg) in the middle section. In order to estimate the bioaccessible fraction of iodine, seaweeds were digested by an in vitro enzymolysis method, dietary fibre separated from residue, and both fractions analyzed by EINAA-CSS. The average daily dietary intakes of total (0.14 mg) as well as bioaccessible fraction (0.12 mg) of iodine from the consumption of sea mustards were estimated. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Nakagomi S.,Ishinomaki Senshu University | Kokubun Y.,Ishinomaki Senshu University
Journal of Crystal Growth | Year: 2012

β-Ga 2O 3 thin films were prepared by gallium evaporation in oxygen plasma. The crystal orientation of the β-Ga 2O 3 films was studied in detail using X-ray diffraction, pole figure measurements and analysis using a crystal model. β-Ga 2O 3 films formed on both the (001) c-plane and (110) a-plane of the sapphire substrate were found to be strongly (201) oriented. Six crystal types of β-Ga 2O 3 are formed, rotated about the [201] direction. The six directions depend on the arrangement of oxygen on the surface of the sapphire substrate. The direction of [201] of β-Ga 2O 3 is vertical to the sapphire {100} planes. The arrangement of oxygen on the (001) c-plane sapphire substrate is equivalent to that formed on the (201) plane of β-Ga 2O 3 due to a small mismatch in the spacing between oxygen atoms. This mismatch explains why β-Ga 2O 3 is (201) oriented on the (001) c-plane sapphire substrate. © 2012 Elsevier B.V. All rights reserved.

Suzuki R.,Ishinomaki Senshu University | Nakagomi S.,Ishinomaki Senshu University | Kokubun Y.,Ishinomaki Senshu University
Applied Physics Letters | Year: 2011

We fabricated Ga2 O3 photodiodes composed of a Au Schottky contact and a β-Ga2 O3 single-crystal substrate with a sol-gel prepared high resistivity cap layer. The photodiodes with the cap layer showed solar-blind photosensitivity under both forward and reverse biases in contrast to conventional Schottky photodiodes. Finally, we proposed energy band diagram of the i-n junction to determine the photodetection mechanism of our photodiodes. The photoconductive device model explained the high responsivity of over 1 A/W at forward bias. In this model, the cap layer behaves like a photoconductor, and the substrate behaves like an electrode that replenishes electrons. © 2011 American Institute of Physics.

Haraguchi K.,Ishinomaki Senshu University | Ono H.,Kyushu University
IEICE Transactions on Information and Systems | Year: 2013

BlockSum, also known as KeisanBlock in Japanese, is a Latin square filling type puzzle, such as Sudoku. In this paper, we prove that the decision problem whether a given instance of BlockSum has a solution or not is NP-complete. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.

Haraguchi K.,Ishinomaki Senshu University
Journal of Information Processing | Year: 2013

In this paper, we study how many inequality signs we should include in the design of Futoshiki puzzle. A problem instance of Futoshiki puzzle is given as an n × n grid of cells such that some cells are empty, other cells are filled with integers in [n] = {1,2,.,n}, and some pairs of two adjacent cells have inequality signs. A solver is then asked to fill all the empty cells with integers in [n] so that the n2 integers in the grid form an n × n Latin square and satisfy all the inequalities. In the design of a Futoshiki instance, we assert that the number of inequality signs should be an intermediate one. To draw this assertion, we compare Futoshiki instances that have different numbers of inequality signs from each other. The criterion is the degree to which the condition on inequality is used to solve the instance. If this degree were small, then the instance would be no better than one of a simple Latin square completion puzzle like Sudoku, with unnecessary inequality signs. Since we are considering Futoshiki puzzle, it is natural to take an interest in instances with large degrees. As a result of the experiments, the Futoshiki instances which have an intermediate number of inequality signs tend to achieve the largest evaluation values, rather than the ones which have few or many inequality signs. © 2013 Information Processing Society of Japan.

Sasaki M.,Ishinomaki Senshu University | Ehara T.,Ishinomaki Senshu University
Journal of Physics: Conference Series | Year: 2013

Dependency of structural properties of silicon oxide thin films prepared using silicon monoxide source material on preparation method has been studied. The structural properties of the silicon oxide films prepared by three methods, vacuum evaporation using e-beam, rf-sputtering, and vacuum evaporation employing resistive heating are studied by IR absorption and Raman spectra. Due to the results, it is found that the structure of the films depends significantly on preparation methods. The films prepared by e-beam evaporation exhibits similar structural properties of SiO2. The film by rf-sputtering shows Raman spectrum corresponds to significantly random amorphous silicon oxide structure. The film by evaporation employing resistive heating exhibits Raman spectrum that has been explained by silicon-oxygen ring structure.

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