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Topic: Feedback loops


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  Learn more about Feedback in the online encyclopedia.   (Site not responding. Last check: 2007-10-08)
Feedback may be negative, thus tending to reduce output, or positive, thus increasing output.
In engineering control theory, feedback is a process in which a signal generated from the output of a system is applied as an input to the same system.
Negative feedback is often deliberately introduced to increase the stability and accuracy of a system, as in the feedback amplifier invented by Harold Stephen Black.
www.onlineencyclopedia.org /f/fe/feedback.html   (904 words)

  
 Feedback -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-08)
Feedback may be (A reply of denial) negative, which tends to reduce output, or (A film showing a photographic image whose tones correspond to those of the original subject) positive, which tends to increase output.
Systems which include feedback are prone to hunting, which is ((physics) a regular periodic variation in value about a mean) oscillation of output resulting from improperly tuned inputs of first positive then negative feedback.
Positive feedback amplifies possibilities of divergences (evolution, change of goals); it is the condition to change, evolution, growth; it gives the system the ability to access new points of (A stable situation in which forces cancel one another) equilibrium.
www.absoluteastronomy.com /encyclopedia/f/fe/feedback.htm   (1710 words)

  
 ISM3011 - E-Business Systems Fundamentals
Feedback is information about the system's performance as it tries to achieve its purpose or goal.
Feedback is used to evaluate the efficiency and effectiveness of the system itself.
Feedback is information and therefore simply "is." How we interpret and use feedback is what is important to us.
www.uwf.edu /wbeatty/ism3011/chap1/feedback.html   (1627 words)

  
 Positive feedback - Wikipedia, the free encyclopedia
In the case of positive feedback the response of the system is to change that variable even more in the same direction.
The negative feedback loop tends to slow down a process, while the positive feedback loop tends to speed it up.
One common example of positive feedback is the network effect, where more people are encouraged to join a network the larger that network becomes.
en.wikipedia.org /wiki/Positive_feedback   (482 words)

  
 Frequently Asked Gibson/Oberheim Echoplex Questions - Page 8
If you have a 20 second loop that consists of a single 20 second cycle, or a 20 second loop that consists of 10 2-second cycles, the effect of feedback is the same.
Sometimes the feedback level is unpredictable, ie, it seems to not wait til the end of the loop to reduce in volume, and if I push the pedal up (off), the sound will stop, but sneak back in somewhere in the loop.
The audio remains digital for the the feedback path, and the feedback is done by a calculation in the processor.
www.loopers-delight.com /tools/echoplex/FAQ8.html   (1876 words)

  
 Forbes.com - Magazine Article   (Site not responding. Last check: 2007-10-08)
Rather, the term is shorthand for "feedback loop," which is a closed system by which the consequences of an event send back data that in turn modify that event in the future.
Negative feedback loops are usually the better kind: By subtracting error with each cycle, they move toward balance and stasis.
The negative feedback loop we know best is called homeostasis, the body's system for keeping itself chemically and temperature balanced.
www.forbes.com /asap/2002/1007/020_print.html   (2488 words)

  
 Interactions, Feedback Loops, and Arctic Weather Patterns
In the climate system a "feedback loop" refers to a pattern of interacting processes where a change in one variable, through interaction with other variables in the system, either reinforces the original process (positive feedback) or suppresses the process (negative feedback).
The temperature—albedo feedback is positive because the initial temperature change is amplified.
Feedbacks between temperature, cloud cover and radiation are potentially important agents of climate change.
nsidc.org /arcticmet/patterns/feedback_loops.html   (381 words)

  
 Pop Occulture: Feedback Loops in Culture   (Site not responding. Last check: 2007-10-08)
When I first read about feedback loops and how they work, it got me thinking about it as a metaphor for how culture works.
Positive feedback causes an increase in energy in a system, and evolves it towards a higher level.
I don't necessarily mean to equate groups with it politically, but perhaps you could use the word "conservative" to describe people who function in the culture as negative feedback loops, ie maintaining equilibrium.
www.timboucher.com /journal/2004/11/feedback-loops-in-culture.html   (346 words)

  
 Control of Endocrine Activity
Feedback circuits are at the root of most control mechanisms in physiology, and are particularly prominent in the endocrine system.
Negative feedback is seen when the output of a pathway inhibits inputs to the pathway.
Feedback loops are used extensively to regulate secretion of hormones in the hypothalamic-pituitary axis.
arbl.cvmbs.colostate.edu /hbooks/pathphys/endocrine/basics/control.html   (764 words)

  
 Biophysical Journal: Modeling Feedback Loops of the Mammalian Circadian Oscillator
In a negative feedback loop, transcription of the period and cryptochrome genes (Per1, Per2, Cry1, and Cry2) is activated by the transcription factor heterodimer BMAL1/CLOCK.
With and without positive feedback the period, phase, and amplitudes of the oscillations are quite robust in response to varying single parameters.
The simultaneous regulation of the two interlocked feedback loops contributes to the maintenance of oscillations and the stability of the period.
www.findarticles.com /p/articles/mi_qa3938/is_200411/ai_n9463179   (1123 words)

  
 COAST - Deep Sea Technology Activities - Feedback Loops
In a feedback loop, information about an ongoing task is continually relayed to the task controller.
Explain that the second kind of operation illustrates a feedback loop-the operator provides data to the machine, the machine provides data (or feedback) to the observing operator, and the operator supplies more data (further feedback) in response.
Without feedback it would be unlikely for the car to strike all ten dominoes in a short time.
www.coast-nopp.org /resource_guide/elem_mid_school/deep_sea_tech_acts/loops.html   (582 words)

  
 Concepts
Feedback is a process in which a decision or action causes changes to occur which, after a time, cause a revision of the decision or action.
Feedback loops typically involve more than one person or organization, each responding to the actions of another in such a way as to, eventually, change the behavior of others.
An archetype is an abstraction of a feedback structure that is known to generate a particular type of behavior.
www.vensim.com /concepts.html   (797 words)

  
 OASYS PCI Avoiding Feedback Loops
Feedback can conceivably happen whenever a digital or analog audio device is bi-directionally connected to the OASYS PCI.
If you are getting feedback in the monitor mixer, the simplest way to stop it is to mute all of the inputs.
Once the inputs are muted and the feedback is stopped, you can track down the actual cause of the feedback loop, and then set up monitoring again as desired.
www.korg.com /oasys_pci_faq_html/troubleshooting/oasys_pci_feedback_loops.htm   (416 words)

  
 1212 I/O Avoiding Feedback Loops
In both analog and digital audio, high-pitched whines are usually due to the inadvertent creation of a feedback loop.
With just a little care, however, feedback loops can easily be avoided.
Once the inputs are muted and the feedback is stopped, you can track down the actual cause of the feedback loop, and then set up Auto-Routing Mode again as desired.
www.korg.com /1212faq/1212_feedback_loops.htm   (632 words)

  
 Feedback loop analysis in the Encyclopedia Project
In the event that on-the-fly generation and visualisation of loops is feasible during web server access, such dynamic displays would be developed as a means of shifting the level of analysis beyond seemingly isolated environmental Problems and Strategies.  The visualization tools would then be adapted to assist editorial and error detection processes.
However, loops are relatively rare in chains of problems.  It was anticipated that the technique to detect loops (to this point explored in a DOS environment in batch mode and delivered online in a static mode) would need to be improved to make it easier for an online user to explore them dynamically.
Clearly the number of loops of the type detected can be considered very large, or even infinite, when the number of elements in a loop is increased.
www.laetusinpraesens.org /docs/loops.php   (2794 words)

  
 Feedback
It is relatively easy to predict the properties of any such sequence from the coefficients, using a device known as the z transform, but as this requires the use of complex numbers it would not be appropriate here.
Feedback can also exaggerate the effects of computational errors (noise) and systems can become capable of operating on the noise alone regardless of any inputs.
Feedback is one of the main reasons that computer models that are not rigorously tested against reality are not worth the magnetic oxide they are written on.
www.numberwatch.co.uk /feedback.htm   (1018 words)

  
 The Two Faces of Feedback
This process creates a negative feedback loop that maintains blood sugar levels as long as the body is able to manufacture just enough insulin and/or glucagon (which is a topic in itself).
Granted, these negative feedback loops come in quite handy when there are legitimate threats to the individual.
Remember, the purpose of the negative feedback loop is to protect the organism from potential harm in order to promote its primary outcome?survival.
www.geniusbydesign.com /mattdocs/feedback.html   (1413 words)

  
 Dinosaur Extinction: Causal Loop Diagram of Earth Feedback Systems
Causal loop diagrams, the first step in evaluating system behavior, show interrelations between system variables and expose feedback loops within individual systems, and between adjoining systems.
Feedback is either positive or negative, and is expressed as the polarity of a feedback loop.
Causal loop diagrams are used as a basis for developing flow diagrams which allow mathematical analysis of the behavior of systems.
filebox.vt.edu /artsci/geology/mclean/Dinosaur_Volcano_Extinction/pages/earthcau.html   (545 words)

  
 Feedback Loops   (Site not responding. Last check: 2007-10-08)
System feedback is a loop wherein information of some kind is fed back into the system.
feedback loop, consisting of a heater and a thermostat, is shown in Figure 3.
According to Stear (1987), all living systems are governed by feedback loops serving as regulatory processes.
www.schuelers.com /ChaosPsyche/part_1_10.htm   (410 words)

  
 Basic Versus Content
Feedback circuits typically spin on a wheel or oscillate from one state to another to accomplish the alternating feedback activity.
Thus the feedback loops that regulate life are produced by the content - the open flow of information within a specific context according to limits set by the society of individuals.
This feedback flows through all of the nested levels of organization modifying the local context and the closed language systems at each successive level.
www.this-magic-sea.com /BASIC.HTM   (2254 words)

  
 Earth Systems, Inputs, and Feedback Loops
For an example of a positive feedback, let's assume that the most violent winds and the full force of the hurricane hit the shore........
A negative feedback is something that would diminish the impact of some input on a system.
Feedback loops serve to take a portion of the system's output and use it as an input somewhere else in the system.
ivc.uidaho.edu /mtpe/assignments/esinpfl.html   (1972 words)

  
 Effective Feedback Loops. Total Experience: Total Experience examines and comments on the emerging practice of ...   (Site not responding. Last check: 2007-10-08)
The most effective use of feedback loops is seen throughout the pages of the Administaff site (a corporate outsourced HR service provider).
One particularly brilliant feedback mechanism can be found buried in their "Talent Sphere Academy" (a mechanism for self-development, apparently the result of another outsourcing connection).
Clicking on either of these launches a feedback form that announces that by submitting the feedback, an audio sound will be broadcast to their employees -- and a sample of the sound can be played.
www.corante.com /totalexperience/archives/2005/04/13/effective_feedback_loops.php   (571 words)

  
 Feedback
In every feedback loop, as the name suggests, information about the result of a transformation or an action is sent back to the input of the system in the form of input data.
In either case a positive feedback loop left to itself can lead only to the destruction of the system, through explosion or through the blocking of all its functions.
In some cases the goal is self-determined and is preserved in the face of evolution: the system has produced its own purpose (to maintain, for example, the composition of the air or the oceans in the ecosystem or the concentration of glucose in the blood).
pespmc1.vub.ac.be /FEEDBACK.html   (420 words)

  
 Glacial Geology glossary
Feedback Loop: Reinforcement which either accelerates (positive feedback) or retards (negative feedback) a process.
An example of positive feedback would be the accumulation of glacial snow and ice increasing the albedo of the surrounding region, thus cooling the air, thus accelerating glacier growth.
An example of negative feedback would be mountain glacier retreat, eliminating low-elevation (ablation) area, thus reducing the rate of retreat.
www.homepage.montana.edu /~geol445/hyperglac/glossary.htm   (2573 words)

  
 All Lives Seek Balance--Homeostasis Introduction
The feedback system is your hand on the faucet, which can turn the faucet to increase or decrease the flow based on what your eyes are telling you.
Closed feedback loops are often called negative feedback loops, which is counter-intuitive, because their action is toward the good of the living system.
This is a positive feedback loop in action, but when the bleeding ends, it stops, and a closed feedback loop takes over.
www.morning-earth.org /Graphic-E/Balance-intro.html   (965 words)

  
 Guidelines for Drawing Causal Loop Diagrams
Causal loop diagrams provide a language for articulating our understanding of the dynamic, interconnected nature of our world.
Creating causal loop diagrams is not an end unto itself, but part of a process of articulating and communicating deeper insights about complex issues.
It is pointless to begin creating a causal loop diagram without having selected a theme or issue that you wish to understand better.
www.thesystemsthinker.com /tstgdlines.html   (816 words)

  
 causal
Model behavior can be difficult to analyze quickly, especially when trying to discover exactly which variables and feedback loops are contributing certain components of behavior to a particular variable.
This tells us that the oscillations in the feedback loop containing sales effectiveness are driving the oscillations in the variables in the other feedback loop.
Looking at the causal loop diagram above, we see that the two major feedback loops converge at the variable orders booked, and it is the negative feedback loop through sales effectiveness that creates the major oscillations which are carried over into the positive feedback loop through Sales Force.
www.vensim.com /causal.html   (493 words)

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