JRC REVIEW No.58 Technical Reports

- Special Issues 1 : Solution for Disaster Management -

Japan enacted the Disaster Countermeasures Basic Law in 1961. Article 55 of this Law specifies notices etc. to be made by prefectural governors, and stipulates that an instant command transmission system to all locations in a prefecture relying on radio communications be constructed as one of key facilities for communicating such notices. Recently, many local governmental organizations have equipped themselves with IP infrastructure facilities to provide disaster and administrative information adapted to the latest ICT. JRC has been developing systems meeting such needs. In Kumamoto Prefecture, JRC has constructed a disaster information network and a prefecture-wide command system using this network which links prefectural bureaus, regional development bureaus, prefectural outpost agencies, municipal governmental offices, and fire departments. This is a report on this prefecture-wide command system using this disaster information network.

Yutaka Suenaga
Norito Kakiuchi
Teruo Okano
Yasushi Yamauchi
Yoshiaki Suzuki

- Special Issues 1 : Solution for Disaster Management -

This Tsunami/Storm surge damage prevention system manages the provision of remote monitoring and control functions for water gates and inland lockage along coastal and river embankments in order to protect lives and property in harbors for transport and fisheries industry etc. from Tsunami generated by earthquakes and storm surge generated by the wind and rain of typhoons etc. Principal purposes of this system are to reliably, safely and quickly close water gate and inland lockage installed in harbors and embankments, in order to prevent the floods caused by the Tsunami/Storm surge, executimg commamds from remote disaster prevention stations (integrated control centers etc.) sent via optical fibers or radio communication.

Kazumi Okano
Kazuhiro Matsuo
Satoshi Ogasawara
Kenichiro Tokushige

- Special Issues 1 : Solution for Disaster Management -

Meteorological Doppler Radar is the radar which has been installed throughout Japan by the Japan Meteorological Agency to detect intense and localized heavy rainfall in all regions. In order to detect the wind direction and speed in an area of rainfall, this radar has functions with higher quality and precision than previous equipment. The antenna installed is parabolic, 4m in diameter, and its revolution speed can be chosen according to observation mode. The transmitter is the C-band klystron type with latest high voltage modulator, and can output radio waves with highly stable frequencies. Out of the 16 Meteorological Doppler Radars in Japan, JRC has supplied 13, and these are contributing to Japan's disaster prevention operations. (as of March 2010) 

Masashi Nagata
Noboru Kawahara
Toshihiro Haneda

- Special Issues 1 : Solution for Radio Communications -

Recently, along with the market demand for high speed data communication, demand is increasing for public use communication networks as well to be able to handle large amounts of data at high speed. An optical fiber network is being constructed as the main lines of the communications network, and microwave radio devices are being set up to be used as back-up for important communications lines in times of disaster. Further, flexible measures need to be taken to meet users' varied demands for public use communications networks. To satisfy such demands of the market, JRC has developed this JUK-ZERO series 16QAM/128QAM multiplex radio communication device.

Kohji Mohri
Shinya Murata
Yasuhide Tanaka
Yasuyuki Katoh

- Special Issues 1 : Solution for Radio Communications -

This is a report on our technological investigation and consideration of the 5GHz radio access system that has been chosen as the radio broadband relay communications network for small islands distant from Japan's main islands, in par ticular the system's long distance radio wave transmission characteristics over water and signal attenuation characteristics during brief intense rains which have been occurring recently, on investigatory and deliberative meetings intended to contribute to increasing reliability and to effective use of radio frequencies, and on transmission tests etc., which have been entrusted to us to carry out.

Kunio Matsuoka
Hiroyuki Miura
Takabumi Sugaya
Masaru Ogasawara
Masahide Warashina

- Special Issues 1 : Solution for Radio Communications -

This roadside broadcasting system provides drivers along a road with voice information through their car radios. The information broadcasted through the radio at 1620kHz deals with accidents and road construction which cause restrictions on passage through roads, restrictions due to sudden changes in the weather, advice for safe driving, scheduled restrictions, scheduled road construction (dates thereof) , etc., and is intended to improve safety while passing along roads.

The broadcasting devices are set up at places where incidents have frequently occurred, in front of and behind traffic restriction zones, and in front of and behind where a road branches, such as junctions.

Care is taken that the driver can easily understand the message which is broadcast for the 2-3km zone the driver is in, repeating a one minute message three times during the time the car traveling at 40km/hr is in the zone to allow the driver to confirm the information.

Masahiro Oka
Hisayuki Sugai
Yasuhisa Yamamoto
Yoshiro Tokushige

- Special Issues 1 : Solution for Radio Communications -

JRC has undertaken 5 large scale coast station projects based on the Indonesia Coast Radio Station Master Plan formulated by JICA (Japan International Cooperation Agency) over 23year span: 1st stage project in 1986, 2nd stage project, SAR (Search and Rescue) project, 3rd stage project, and Remaining project of 3rd project in 1998.

The present 4th stage project, the large scale project developing in 46 cites over all Indonesia as the culmination of previous projects, is primarily based on expanding upon and refurbishing the facilities which have been developed, complete refurbishment of small-scale local stations, and the introduction of AIS (Automatic Identification System) .

The primary equipment configuration of each station is as follows: the coast station system for communicating with ship station mainly based on MF, HF, and VHF radio equipments, multiplex radio equipments, AIS, training facilities, and maintenance facilities. In addition to those equipments, installation work is also to be provided as full turnkey contract.

Toru Wakazono
Akihiko Takahashi
Tsutomu Arita

- Special Issues 1 : Solution for Radio Communications -

The agricultural water control system is intended to stably supply agricultural use water to farmer, passing water took at dams and head works through gates and pipelines to pumping stations, farm ponds, and diversion works.

JRC has produced a system with a control center which monitors water levels and amounts and controls operation of gates and pumps at each facility through leased line or radio links, so that fewer operators with lighter workloads are sufficient and so that each facility can be controlled for safe and fast operation.

Kensuke Takai
Nobuhiko Takemura

Tsuyoshi Noda
Gaku Nishimura
Hideo Shibata

- Special Issues 2 :Fundamental Technology -

Disaster prevention GIS (geographic information systems) up to the present often use expensive commercial-use GIS engines when displaying information on a map, but there are many cases where simple map display functions alone are used and skillful use of the bountiful functions of the commercial-use GIS engines is not required, and benefits commensurate with the cost of these engines are not achieved.

To deal with this problem, there is a method of constructing a disaster prevention GIS system for a low price using a GIS engine which is open source software (OSS) . JRC has developed a disaster prevention GIS system using MapServer which is an OSS GIS engine that has performed well in many situations, and its method of construction is introduced here.

Akinori Mori
Yoshio Sumida
Takafumi Takada
Naoto Uchida

- Special Issues 2 :Fundamental Technology -

DREC-2004A is the long hour and the multi-channel recording and playback equipment for Air Traffic Control voice communications, and helps the later analysis of Air Traffic Accident.

DREC-2004A is a dual redundant configuration to allow the continuous recording by adapting the stand-by recording deck to record the voice communications in case of master recording deck failure.

DREC-2004A continuously stores voice communications up to 1 month, which are down-loadable to data cartridge for storage by 24-hour (One day) basis.

Yoshihiko Wakisaka
Jun Fujiwara
Keisuke Jimbo