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JAMSTEC 2002 Annual Report Marine Ecosystems Research Department quality after freezing and thawing. The general feeling was that the deep seawater salt gives the salmon roe a slightly brighter color and a milder taste than when processed with normal table salt. We also confirmed that the roe tends to have a slightly softer texture. 64
Japan Marine Science and Technology Center Research Activities Computer and Information Department Policy for Research and Development The Computer and Information Department promotes various research and development programs aimed at advancing computer technologies applicable to marine phenomena. These programs include database development of various observed data, research support for development of numerical models and others for supercomputers, visualization technologies of the results of numerical simulations, development of innovating computation methods, and surveys on computer utilization environment. In fiscal we continued our work on the program "Establishment of a Deep Sea Image Distribution System on JGN (Joint Research)". We also used the supercomputer to examine parallel computation, e.g., computation of underwater acoustic propagation. Outline of Research and Development Themes (1) Establishment of a Deep Sea Image Distribution System on JGN (Joint Research) JAMSTEC has accumulated massive volumes of image data from marine surveys and research carried out using manned research submersibles, e.g., SHINKAI , and remotely operated vehicles. The Global Oceanographic Data Center (GODAC) in Nago, Okinawa is responsible for digitalizing, indexing, storing and disseminating these image data. This enormous mission requires a high-speed network to transmit high-definition images and videos between GODAC and Yokohama Institute for Earth Sciences. Initially we built a Mbps circuit test environment using the JGN (Japan Gigabit Network; super-highspeed optical fiber transmission and broadcasting network). We later planned to increase this circuit to Mbps. This fiscal year we encoded and indexed deep-sea images, and enabled the public to access a section of these images on a trial basis from the earth environment portal Web (http://www.godac.jp/) using RealVideo streaming. In November we increased the circuit capacity to Mbps for JGN event use, and carried out high-definition image transmission tests. These tests were conducted concurrently with tests for transmitting high-definition images from the super-high-definition camera fitted on the ROV HYPER-DOLPHIN via satellite to the National Museum of Emerging Science and Innovation. The success of our tests confirmed that JGN is effective for transmitting high-definition images. Manned research submersible Deep-sea images Yokohama Institute for Earth Sciences Indexing Digitizing Transfer of high-definition video JGN Global Oceanographic Data Center Global information collection Digital archiving Provision of global information over the Web Public use of facilities Check by researchers of information attached to images Dissemination to users Open access through the internet and the Nago regional intranet Fig. 1 Overview of the system 65
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