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SPFSun Protection Factor (sun block rating)
SPFSender Policy Framework (antispam initiative)
SPFStrategic Prevention Framework (US federal grant program)
SPFShortest Path First
SPFService Public Fédéral (Belgium)
SPFSingapore Police Force
SPFSpecific Pathogen Free
SPFSygate Personal Firewall
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SPFSeasonal Performance Factor (heat pumps)
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SPFSecours Populaire Français
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SPFSpruce Pine Fir
SPFSharePoint Foundation (web platform)
SPFSpray-applied Polyurethane Foam
SPFSociety for the Propagation of the Faith
SPFSasakawa Peace Foundation (Japan)
SPFSkin Protection Factor
SPFServicio Penitenciario Federal (Spanish; Argentina)
SPFSouthern Powerlifting Federation (weights)
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SPFStandard Pacific Corporation (stock symbol)
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SPFSociété Préhistorique Française (French: French Prehistoric Society; est. 1904)
SPFSquirrel Proof Feeder
SPFSystem Productivity Facility (system used in TSO to create and edit data)
SPFSustainable Production Forestry (Australia)
SPFStandard Policy Form (insurance)
SPFStandard Project Flood
SPFServicio Público Federal (Mexico)
SPFSuper Frame (ITU-T)
SPFStructured Programming Facility
SPFSkagitonians to Preserve Farmland (Mount Vernon, WA)
SPFSociété de Psychanalyse Freudienne (French: Freudian Psychoanalysis Society; est. 1994)
SPFSmartPlant Foundation (Intergraph)
SPFSystem Programming Facility
SPFSouthern Partners Fund (Atlanta, GA; philanthropy)
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SPFSoftware Production Facility (NASA)
SPFSlide Presentation File (EnerGraphics file extension)
SPFSwiss Peace Foundation
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SPFSubscriber Plant Factor
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SPFSynthetic Phase Fraction
SPFSpecial Purpose Force
SPFSecurity Police Flight
SPFSignal Processing Facility
SPFStrategic Projection Force
SPFSIDPERS Personnel File
SPFScience Policy Foundation (United Kingdom)
SPFSensor Fusion Post
SPFShipper Paid Forwarding (US Postal Service program for payments)
SPFS&P Food Industries (Malaysia)
SPFStealthy Packet Filter (Firewall)
SPFSite Population Factor
SPFStair Pressurization Fan (mechanical services)
SPFSpecialist Portfolio (New York Stock Exchange)
SPFSpecialist, Fire Fighter (US Navy)
SPFScientific Primates Filipinas, Inc
SPFSpecial Performance File
SPFSpecial Function Memory
SPFSpare Parts File
SPFSingle Point of Filing
SPFSignal on Protection Fiber
SPFStandard Plume Flowfield code
SPFSingle Project Funded
SPFSabaragamu Peoples' Foundation (Sri Lanka)
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References in periodicals archive ?
However, a problem now arises, namely, that the time for generating the topology at 1529 ms is too long for a super frame. Thus, this mechanism without a setup period has to be abandoned.
The reason is that the time for generating the topology with a reasonable link quality is much too long for a super frame. Another reason is that the topology is relatively stable after it has been generated and thus it would be wasteful to assign a long time for the CSAM period for topology maintenance.
After 2608 ms, the nodes start to transmit beacon packets again which implies that the second super frame arrives.
According to the above simulation results, the total time of a super frame [t.sub.Frame], the time of the CSMA stage in a super frame [t.sub.CSMA], the time of the TDMA stage in a super frame [t.sub.TDMA], and the time of the set up period [t.sub.Setup] can be calculated as follows:
According to the results of the simulation experiments, the time of the setup period of the dynamic routing mechanism has been determined but how much time should be assigned to the CSMA period in each super frame has not.
In the next super frames, several time slots are assigned to the CSMA period in order to maintain the topology.