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  1. Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
  2. Path: sparky!uunet!paladin.american.edu!auvm!MCIMAIL.COM!0004742580
  3. Message-ID: <74920817234847/0004742580NA1EM@mcimail.com>
  4. Newsgroups: bit.listserv.csg-l
  5. Date:         Mon, 17 Aug 1992 23:48:00 GMT
  6. Sender:       "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
  7. From:         Dag Forssell <0004742580@MCIMAIL.COM>
  8. Subject:      Dist, Jobs
  9. X-To:         csg <CSG-L@vmd.cso.uiuc.edu>
  10. Lines: 91
  11.  
  12. [From Dag Forssell (920817)]
  13.  
  14. Bill Powers (920817.1130)
  15.  
  16. >"Disturbance" is an ambiguous term; it can refer either to the variable
  17. >that is causing the disturbance (wind velocity, bump in the road) or to
  18. >the effect that the disturbance has (change in direction of the car's
  19. >motion). Just lately I'm experimenting with using "independent variable"
  20. >to mean the CAUSES of disturbances, and "disturbance" to mean the
  21. >effect, if any.
  22.  
  23. Your experiment creates an error signal here. I will grant you that
  24. everything is variable, but we have been using the term variable to
  25. signify that feature of the environment that we want to control. We talk
  26. about the VARIABLE plain and simple. If everything is going to vary, let
  27. us come up with a different name.
  28.  
  29. May I suggest:
  30.  
  31.                       Reference
  32.                           |
  33.                           v
  34.         -------------> Compare ---------------------
  35.         |                                           |
  36.         |                                           v
  37.       Input                                      Output
  38.    (Perception)                               (Instruction)
  39.         ^                                           |
  40.         |                                           v
  41.         |                                     (CS) ACTION
  42.         |                                           |
  43.         |                                           v
  44.         |                                   CS ACTION INFLUENCE
  45.         |                                  (Influence depends on
  46.         |                                "loose or tight coupling,"
  47.         |                                   -worn linkage, etc
  48.         |
  49.         |              VARIABLE                     |
  50.          -------   Physical equivalent  <------------------->OTHER
  51.                    to reference signal                   CONSEQUENCES
  52.                            ^
  53.                            |
  54.                DISTURBING ACTION INFLUENCE
  55.                 (Influence depends on
  56.                 loose or tight coupling)
  57.                            ^
  58.                            |
  59.                    DISTURBING ACTION
  60.                 air blast, bulldozer etc
  61.  
  62. The "influences" shown here are only shown as arrows in our graphs, but
  63. do often figure prominently in the verbal descriptions. It may not be
  64. obvious to all that it is the arrows that are being described sometimes.
  65.  
  66. _______________________________________________________________________
  67. Tom Bourbon  (920817)
  68.  
  69. Where does security come from? Is it the art of staying with your ship,
  70. (even if it may sink)? Is security knowing how to swim to a new ship?
  71.  
  72. Tom, have you been swimming any in the last 20+ years? How do you teach
  73. Tom to swim? Throw him into the water.
  74.  
  75. These may not be good times to look for work, but there are some timeless
  76. principles to guide you. The principles are to be found in a sometimes
  77. misunderstood systems concept called PCT.
  78.  
  79. Seriosly, looking for work is hard work. There are many books catering
  80. to your sense of panic. Some of them are good, but overwhelming in the
  81. application. I am thinking of Richard Nelson Bolles' perennial
  82. "Parachute," which should be thought of as a reference only (a good one
  83. at that).
  84.  
  85. Presuming that industrial experience can be translated to whatever market
  86. you approach, I would heartily recommend:
  87.  
  88. 1) "Executive Jobs Unlimited" by Carl R. Boll. Macmillan 1979.
  89.    Order it, read and see how the suggested activity fishes for open
  90.    error signals (which you can satisfy) in the people you contact.
  91.  
  92. 2) When you do make a contact, don't blow it by putting yourself down.
  93.    Get "Sweaty Palms; The neglected art of being interviewed" by
  94.    H. Anthony Medley.
  95.  
  96. You are embarking on a great marketing adventure. Make the most of it.
  97. It can be fun. Knowing that you can do it gives a strong sense of
  98. security.
  99.  
  100. When you post version one, two ..... seven, you will get feedback.
  101.  
  102. Wishing you all the best,        Dag
  103.