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Kurita A.,Nippon Signal Co.
Japanese Railway Engineering | Year: 2013

In December, 2011, the Beijing Subway line No. 15 started operations with SPARCS (Simple-structure and high-Performance ATC by Radio Communication System). SPARCS is a moving block train control system which uses 2.4GHz band radio communication system developed by NIPPON SIGNAL Co., Ltd. The overview of the system and features of the facilities with a focus on radio communication system are introduced in this paper. Source


Matsuo H.,Nippon Signal Co. | Kawai Y.,Tohoku University | Esashi M.,Tohoku University
Japanese Journal of Applied Physics | Year: 2010

A two-dimensional (2D) optical micro mirror scanner with piezoelectric film deposited by metal organic chemical vapor deposition (MOCVD) was designed, fabricated, and evaluated. The overall area of the device is 2:5 × 2:5mm2 and the mirror diameter is 1 mm. A small footprint device compared with the mirror size was realized. The piezoelectric film was deposited using a semi-homemade MOCVD apparatus. The device was fabricated by a micro fabrication technique with simple three mask processes. The optical scanning angles of torsional and bending rotations are, respectively, 17 and 16̊ at 20 Vpp-p with a 1.6-μm-thick lead zirconate titanate (PZT) film and a 20-μm-thick Si structure in atmospheric ambient. The resonant frequencies of torsional rotation mode and bending rotation mode are, respectively, 15 and 10 kHz. The laser beam scanning of an unclosed Lissajous figure can scan all the pixel points on a 2D image frame within a certain time interval. The small 2D scanner is expected to be suitable for the mass production of portable optical devices. © 2010 The Japan Society of Applied Physics. Source


Matsuo H.,Nippon Signal Co. | Kawai Y.,Tohoku University | Tanaka S.,Tohoku University | Esashi M.,Tohoku University
Japanese Journal of Applied Physics | Year: 2010

The (100)-/(001)-oriented Pb(Zr,Ti)O3 films using Pt nanofacets and PbTiO3 seeding layer were invesigated. The Ti/Pt electrodes were deposited using a sputtering system. Pb(Zr,Ti)O3 and PbTiO3 seeding layer were deposited using a semi-homemade metal organic chemical vapor deposition (MOCVD) apparatus. The Pt nanofacets on hillocks caused by Ti diffusion and compressive stress can be prepared by preannealing of the electrode on the substrate. The most highly (100)-/(001)-oriented Pb(Zr,Ti)O3 films were obtained with the same thickness deposition of the PbTiO3 seeding layer as the half value of maximum roughness (Rz) of the Pt surface, which is approximately 3.5-4.0 nm. A simple (100)/(001) orientation method was developed without any special oxide metal electrodes or single-crystal substrates for orientation using commonly unpreferable hillocks, which cause the problems. This simple method is suitable for commercial applications in the future. © 2010 The Japan Society of Applied Physics. Source


Ishii S.,Nippon Signal Co.
IEEJ Transactions on Industry Applications | Year: 2015

The Reliability, Availability, Maintainability and Safety (RAMS) and the Common Criteria (CC) standards have a large number of common requirements that cover highly divergent fields. This is because both are standards relating to the third party certifications of products, the purpose of which is to realize safety and security. Business operators and manufacturers need to comply with increasingly larger numbers of international standards and third party certifications. It is necessary exercise care and avoid inter-standard conflicts, not by complying with each standard, but by devising internal rules that are consistent with all the applicable standards. This paper takes a bird's-eye view of various international standards, and focuses on the common points of the RAMS and CC standards to help ensure compliance with both of them. © 2015 The Institute of Electrical Engineers of Japan. Source


Tayamachi T.,Nippon Signal Co. | Yoshida T.,National Police Agency | Kamata K.,Universal Traffic Management Society of Japan
20th ITS World Congress Tokyo 2013 | Year: 2013

The signal control (recall control) used at conventional push-button intersections has problems: although more than one vehicle is approaching the intersection, the signal is red thereby stopping the approaching vehicles; or the pedestrian signal does not turn green for a long time although there is no vehicle approaching the intersection. Accordingly, we conducted a signal control experiment to reduce unnecessary stop of vehicles and shorten pedestrians' waiting time by controlling the signals in accordance with the arrival of a vehicle on the main road. Source

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