By O'sullivan F., Roy S.
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Extra info for A statistical measure of tissue heterogeneity with application to 3D PET sarcoma data (2003)(en)(16s
It might be decided that the opportunities offered by a site outweigh its risks, particularly if good continuity arrangements can be made. SECURITY CONCERNS Security risks and needs should be analysed and specified prior to the selection of a location for trading. There tends to be an increased risk of terrorist activity in financial centres, and the potential for car bombs, for example, should be taken into account. One large financial organization in the City of London has a main trading floor and associated equipment room that extend over a public road where vehicles can be parked.
However if the trading floor organization contracts with the property owner/manager for 150 KW power and cooling infrastructure when it only needs 100 KW, that could represent a substantial overspend during the operational life of the facility. Once the power requirements have been established, it is possible for a qualified engineer or experienced team member to work out the cooling load for the total power released in the trading floor, offices and equipment rooms. Steady-state power and switch-on power The technology team needs to calculate the electrical power needs of the equipment to be installed in the trading floor, back office and equipment rooms.
This is a factor to be checked when negotiating the premises lease or rental. This overnight heat load can be reduced by arranging for PCs to be switched off, or at least revert to a standby mode, if left unattended for more than one hour. Note that the power consumed (and heat output) by a PC increases from the base estimate as more disk drives are added, particularly if high-speed 10–15K rpm disks are installed, as is common in trader workstations. In theory this adds an additional 15 W per disk, but allowing for PSU inefficiency it is more like 20 watts.