Fukushima-shi, Japan
Fukushima-shi, Japan

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Nagahama H.,Tokushima University | Inagaki T.,Chiba University | Ikeda N.,KICTEC Inc. | Takahashi K.,KICTEC Inc. | And 6 more authors.
Advances in Intelligent Systems and Computing | Year: 2017

Crossing crosswalks is one of the most dangerous situations for visually impaired persons. Crosswalk entrances are located on the boundary with the roadway and are among the most dangerous areas for visually-impaired persons. Tactile walking surface indicators (TWSIs) are installed on the road to support independent travel for blind and low-vision individuals. We developed an LED block equipped with projections to strengthen the support of the crosswalk entrance. The blind person can sense this block through the soles of the shoes. A low-vision person can find it through the use of residual vision. Blind and visually impaired persons found that the LED block equipped with projections to locate the travel direction effectively supported crossing. The effectiveness of this block is described based on measurements and questionnaire results. © Springer International Publishing Switzerland 2017.

Ogawa H.,Meijo University | Kan A.,Meijo University | Ikeda N.,KICTEC Inc. | Fujita A.,Meijo University
Physica B: Condensed Matter | Year: 2012

The effect of In doping on the electroluminescence (EL) properties of Zn 2SiO 4:In thin films was investigated. In-doped Zn 2SiO 4 thin films were deposited on BaTiO 3 substrates and their EL properties were characterized in this study. X-ray powder diffraction patterns of In-doped Zn 2SiO 4 powders revealed a single phase of Zn 2SiO 4 for In concentrations up to approximately 1.5 mol%, whereas a secondary phase of In 2O 3 was observed for In concentrations in the range of 2-10 mol%. The maximum luminance of thin film electroluminescent (TFEL) devices varied significantly with the amount of In doping. The highest luminance with blue emission was obtained when 2 mol% In was doped. The blue emission of In-doped Zn 2SiO 4 thin film may be related to the In substitution for Zn. The 2 mol% In-doped Zn 2SiO 4 thin film exhibited blue emission with CIE color coordinates of x=0.208 and y=0.086. © 2012 Elsevier B.V.

Tagawa A.,Japan Atomic Energy Agency | Tezuka M.,Japan Atomic Energy Agency | Terakura Y.,KICTEC Inc. | Naitou M.,KICTEC Inc. | Miyazima K.,KICTEC Inc.
International Conference on Nuclear Engineering, Proceedings, ICONE | Year: 2013

It is one of the most urgent issues to remediate the nuclear power plants contaminated by radioactive materials discharged following the accident at the TEPCO's Fukushima Daiichi NPS. Concrete walls of nuclear power plants in Japan are coated an epoxy resin coating for easily performing decontamination. We experimented a cutting test in Fugen Decommissioning Engineering Center using maximum 280MPa pressure and 30L/min water quantity, ultra-high pressure water jet system and 40m3/min air quantity vacuum system. We are conducting a study of decontamination technology in environmental pollution using this decontamination system. This decontamination system has achieved a decontamination factor 10 to 100. In environment experiments, we achieved more than 10 decontamination factor in water pressure of more than 150MPa. Thus, we have confirmed the change in a cutting ability by changing parameters. Parameters are the water pressure, the water quantity and air quantity. The impact force for water jet is a function that contains the test parameters. We have considered it using this function. The results of the test showed that there is a correlation between the impact force for water jet and a cutting capability. This decontamination technology can decontaminate radioactive material of the surface adhesion contamination and reduce the amount of waste generated for a thin cutting. In addition, we have experimented that the water can be recycled by chemical precipitation. After we experimented flocculation test using aluminum sulfate and zeolite flocculant, we have confirmed that it. can clean water up to the level of suspended solids 5mg/L, in turbid water using zeolite flocculant. This suspended solids concentration can be passed to the water processing system in nuclear power plant. From the test results, we found that ultra-high pressure water jet decontamination technology has a possibility that it can be used for decontamination of Fukushima Daiichi nuclear power plant. Copyright © 2013 by ASME.

Ikeda N.,KICTEC Inc. | Takahashi K.,General Support Center for the Visually Handicapped | Yamamoto G.,KICTEC Inc. | Kimura Y.,KICTEC Inc. | And 3 more authors.
Assistive Technology Research Series | Year: 2013

A person with low visual capacity's eyesight might decrease remarkably under low-light conditions such as the morning, evening, and nighttime, decreasing their opportunities to go out. Research and development underway to ensure safe walking for visually impaired persons examined a walking guidance system in which LED blocks are embedded into the road at edges of warning blocks installed at crosswalk entrances. The LED block used in the experiment is 120mm wide and 300mm long. The LED block is a flat-topped bar made from transparent acrylic fiber. The solar panel and LED are embedded in the ground. The LED block is set adjacent to the warning block at crosswalk entrances. The LED block can be detected with the visually impaired person's residual vision. Blind persons can also detect this block through the soles of their shoes. The detectability of this LED block was evaluated by subjective experiments performed by visually impaired and blind persons. The function of the temporary stop can be strengthened in the sight or the sense of touch. Installing LED blocks at crosswalk entrances was found to be useful for guiding visually impaired persons. © 2013 The authors and IOS Press. All rights reserved.

Ikeda N.,KICTEC Inc. | Takahashi K.,General Support Co. for the Visually Impaired | Inagaki T.,Nihon University | Sato K.,Tokushima University | And 5 more authors.
Studies in Health Technology and Informatics | Year: 2015

According to the WHO, about 80% of visually impaired persons in the world are with low visual capacity. It is considered that LVs' safe independent mobility will be improved as employing Tactile Walking Surface Indicators (TWSIs). In the night, guidelines for constructing warning blocks, a kind of tactile surface indicator, have not been well established. Therefore, crossing crosswalks is one of the most dangerous situations for visually impaired persons. We thus developed novel LED blocks that indicate crosswalk boundaries between sidewalks and roadways. This study addresses the LED blocks under various environmental illuminations and illumination from the opposite side of the crossing. © 2015 The authors and IOS Press. All rights reserved.

Omori K.,Hyogo Institute of Assistive Technology | Yanagihara T.,Kinki University | Kitagawa H.,Hyogo Institute of Assistive Technology | Ikeda N.,KICTEC Inc.
Studies in Health Technology and Informatics | Year: 2015

Some people with low vision or elderly persons tend to walk while watching a nearby floor, therefore, they often overlook or hard to read suspended signs. In this study, we propose two kinds of voice guides, and an experiment is conducted by participants with low vision using these voice guides and graphic floor signs in order to investigate effectiveness of these combinations. In clock position method (CP), each direction of near facilities are described in using an analogy of a 12-hour clock. Meanwhile, in numbering method (NU), near facilities are put the number in clockwise order, however, each direction are only illustrated in a crossing sign. As a result of an experiment, it is showed that both voice guides are effective for pedestrians with low vision. NU is used as a complement of graphic floor signs. Meanwhile, CP is used independently with graphic floor signs, however, there is a risk in the case of using in the environment where pedestrians are easy to mistake the reference direction defined by the sounding speaker. © 2015 The authors and IOS Press. All rights reserved.

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