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Kawamura, Hideyuki; Yoon, J.-H.*; Ito, Toshimichi
Umi To Sora, 80(1), p.37 - 45, 2004/07
The Japan/East Sea Intermediate Water (JESIW) characterized by Salinity Minimum Layer (SML) with dissolved oxygen (DO) maximum was frequently observed in the Japan Sea. It is suggested that the origin of the JESIW is the coastal fresh water along the Primorye and North Korean coasts. The fresh water near the subpolar front along 40
N advected from the coastal region has the possibility to sink into intermediate depth. This study aims to understand the formation mechanism of the JESIW by using the three-dimensional nested model. The results show that 1/18-resolution model can reproduce the strong downward velocity with the maximum of about 0.05 cm/s along the subpolar front in the Japan Sea. It results in the patch of low salinity water in the intermediate depth, which is consistent with the observational result. It is indicated that the high-resolution model is useful to reproduce the JESIW, since it can reproduce the meso-scale phenomenon such as baroclinicity near the frontal area, which is an important factor for surface water transport into the intermediate depth.
Odano, Naoteru; Ishida, Toshihisa; Wada, Koji*; Imai, Hiroshi*
JAERI-Research 2001-039, 59 Pages, 2001/07
JAERI-Research-2001-039.pdf:4.47MB
A very small reactor, SCR (Submersible Compact Reactor), whose thermal output is 1250 kW, is an integral-pressurized type reactor to be used as a power source for a scientific research vessel in medium depth region of the Arctic Ocean. Neutronic study has been carried out for design of the SCR core of which could achieve continuous long-term operation without refueling for 10 years considering 50 % of load factor of the core. In the present study, arrangement of fuel rods, 
U enrichment of UO
fuel rods and reflector materials were surveyed. The U enrichment has been determined to be 9.5 wt% to satisfy design criteria. In the present study Be metal was adopted as a reflector material. Reactor physics parameters including reactivity coefficients and power distributions were evaluated for the determined core specifications. Reactor physics parameters related to core safety were also confirmed and the evaluated parameters indicated that the determined core specifications in this study satisfied design conditions.
Kusunoki, Tsuyoshi; Fujimoto, Hiromi*; Nagata, Yutaka*; Takahashi, Teruo*; Ishida, Toshihisa
Kaiyo Chosa Gijutsu, 12(2), p.1 - 10, 2000/09
no abstracts in English
Odano, Naoteru; Kusunoki, Tsuyoshi; Yoritsune, Tsutomu; Fukuhara, Yoshifumi*; Saito, Kazuo*; Takahashi, Teruo*; Ishida, Toshihisa
Proceedings of International Workshop on Utilization of Nuclear Power in Oceans (N'ocean 2000), p.164 - 169, 2000/02
no abstracts in English
Ikeda, Kohei*; Suzuki, Tsuyoshi*; Yamashiro, Hideyuki*; Takemura, Fumiaki*; Kawabata, Kuniaki
no journal, ,
We develop a wiper device for underwater monitoring sensor nodes. Coral images are gathered by the sensor nodes, but a camera view of the sensor node is interfered by attached algae. Therefore, attached algae are removed by the wiper device. In this paper, we conducted an experiment to confirm the wiper function in the long term operation.
Suzuki, Tsuyoshi*; Soma, Ryo*; Sawai, Kei*; Kawabata, Kuniaki; Takemura, Fumiaki*; Takahashi, Satoru*; Yamashiro, Hideyuki*
no journal, ,
We developed a wireless sensor network system, Underwater Monitoring Sensor Network (UMSN), to support the coral reef observation activities for maintaining the coral reef environment. In this paper, we examined the communication conditions of wireless communication function which is equipped on a sensor node of UMSN for verifying the performance of the communication function on the practical experiment area.
Kitamasu, Ryo*; Takahashi, Satoru*; Kawabata, Kuniaki; Ogasawara, Kei*
no journal, ,
Research of monitoring of corals plays an important role in observing the natural environment on a global scale. Identifying and detecting corals amongst other objects, including marine organisms, from an image taken undersea is a difficult task. Moreover, there are many types of corals and they cannot be easily categorized automatically. Currently, texture analysis is being pursued that solves the problem of detecting and recognizing corals from pictures taken undersea; Haralick 14 conditional equations are used to calculate the texture characteristics information based on the gray levelco-occurrence matrix of 256 gradations and also to perform liner discrimination analysis on the characteristics information. In this paper, we propose one algorithm of texture analysis for discrimination of undersea objects, in order to detect the corals.
