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  2. Dollar cost averaging - Wikipedia

    en.wikipedia.org/wiki/Dollar_cost_averaging

    Dollar cost averaging (DCA) is an investment strategy that aims to apply value investing principles to regular investment. The term was first coined by Benjamin Graham in his 1949 book The Intelligent Investor. Graham writes that dollar cost averaging "means simply that the practitioner invests in common stocks the same number of dollars each ...

  3. Localizer type directional aid - Wikipedia

    en.wikipedia.org/wiki/Localizer_Type_Directional_Aid

    An LDA approach also is designed with a normal course width, which is typically 3 to 6 degrees. (At each "edge-of-course", commonly 1.5 or 3 degrees left and right of course, the transmitted signal is created in such a way as to ensure full-scale CDI needle deflection at and beyond these edges, so the pilot will never falsely believe they are ...

  4. Ronald Reagan Washington National Airport - Wikipedia

    en.wikipedia.org/wiki/Ronald_Reagan_Washington...

    Many pilots regard the Potomac River approach pattern at National Airport as one of the more interesting landing approaches in the United States [60] Boeing flew a 787-8 Dreamliner into DCA in 2011. It is one of the only wide-body aircraft to ever land at the airport. Reagan National Airport has some of the strictest noise restrictions in the ...

  5. Channel allocation schemes - Wikipedia

    en.wikipedia.org/wiki/Channel_allocation_schemes

    In Fixed Channel Allocation or Fixed Channel Assignment (FCA) each cell is given a predetermined set of frequency channels. FCA requires manual frequency planning, which is an arduous task in time-division multiple access (TDMA) and frequency-division multiple access (FDMA) based systems since such systems are highly sensitive to co-channel interference from nearby cells that are reusing the ...

  6. Direct coupling analysis - Wikipedia

    en.wikipedia.org/wiki/Direct_coupling_analysis

    Direct coupling analysis or DCA is an umbrella term comprising several methods for analyzing sequence data in computational biology. [1] The common idea of these methods is to use statistical modeling to quantify the strength of the direct relationship between two positions of a biological sequence , excluding effects from other positions.

  7. Instrument landing system - Wikipedia

    en.wikipedia.org/wiki/Instrument_landing_system

    ILS planes. An instrument landing system operates as a ground-based instrument approach system that provides precision lateral and vertical guidance to an aircraft approaching and landing on a runway, using a combination of radio signals and, in many cases, high-intensity lighting arrays to enable a safe landing during instrument meteorological conditions (IMC), such as low ceilings or reduced ...

  8. Variable-gain amplifier - Wikipedia

    en.wikipedia.org/wiki/Variable-gain_amplifier

    A digitally controlled amplifier (DCA) is a variable-gain amplifier that is digitally controlled. The digitally controlled amplifier uses a stepped approach giving the circuit graduated increments of gain selection. This can be done in several fashions, but certain elements remain in any design.

  9. Potomac Consolidated TRACON - Wikipedia

    en.wikipedia.org/wiki/Potomac_Consolidated_TRACON

    Potomac TRACON (Terminal Radar Approach CONtrol), abbreviated PCT, is the FAA air traffic control facility in charge of the Washington, D.C. airspace and Washington Special Flight Rules Area, assigning squawk codes. [1] It is based in Warrenton, Virginia, United States.