## A Methodology for Systems Engineering, Volume 24 |

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Page 23

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**circuits**† and 19,860,000 miles of telephone**circuits**† ( Fig . 2-2 ) . This is about 22 per cent of the total telephone**circuit**miles that are over 25 miles long . The largest addition to this North American network was completed . in ...Page 217

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**CIRCUITS**100 90 90 80 90 PER CENT OF**CIRCUITS**ABSCISSA 20 60 VI 50 70 60 50 50 40 30 30 NORTHWESTERN BELL TELEPHONE**CIRCUITS**; END OF 1950 20 20 10 O 2 4 6 8 10 ။ 12 14 16 Fig . 6-14 . NUMBER OF**CIRCUITS**PER GROUP Distribution of**circuit**...Page 399

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**circuit**analysis are broadly as follows . Given any**circuit**, we assign the binary - valued variables according to the model equations ( 15-12 ) and ( 15-13 ) . Then we write the**circuit**equations . Either a truth table or a state ...### Contents

WHAT IS SYSTEMS ENGINEERING? | 3 |

THE TD2 RADIO RELAY SYSTEM | 23 |

3 4 The State of the Environment at the End of | 32 |

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alternative analog computer analysis basic behavior block diagram called channel Chapter circuit complete components cost creative criterion decision decision theory defined demand functions direct distance dialing discussed economic environment equation equipment evaluation example existing exploratory feedback frequency given important income individual inputs and outputs interval scale kind laboratory level of measurement logical loop manufacture Mason's rule matrix means measure ment methods minimax mixed strategy objectives operations research optimal organization payoff payoff matrix phase physical system possible preference probability problem profit properties prospectus radio ratio ratio scale relation requirements satisfy scale signal signal-flow graph specific standing plans statistical studies subsystems systems engineering systems engineering process systems synthesis TD-2 system technical techniques telephone television theory tion transfer function transmission utility utility function value system variables