What is Distributed: Definition and 225 Discussions

Distributed computing is a field of computer science that studies distributed systems. A distributed system is a system whose components are located on different networked computers, which communicate and coordinate their actions by passing messages to one another from any system. The components interact with one another in order to achieve a common goal. Three significant characteristics of distributed systems are: concurrency of components, lack of a global clock, and independent failure of components. Examples of distributed systems vary from SOA-based systems to massively multiplayer online games to peer-to-peer applications.
A computer program that runs within a distributed system is called a distributed program (and distributed programming is the process of writing such programs). There are many different types of implementations for the message passing mechanism, including pure HTTP, RPC-like connectors and message queues.Distributed computing also refers to the use of distributed systems to solve computational problems. In distributed computing, a problem is divided into many tasks, each of which is solved by one or more computers, which communicate with each other via message passing.

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  1. S

    Normally distributed probability problem

    Homework Statement an exam is normally distributed with a mean of 75 and a variance of 64. students with a mark of 90 or above receive an A+ a) what percentage of students receive an A+? b) if 12 students write the exam what is the probability 3 get A+? Homework Equations z-score-...
  2. E

    Electric field due to distributed planar charge

    An annulus (disk with a concentric hole) has inner and outer radii of R1 and R2 respectively, and uniform surface charge density of \sigma. the annulus lies in the xz plane with the y-axis centered in the hole. a.) using the most basic expression of point charge electric field as a starting...
  3. R

    Sums of exponentially distributed rvs

    Hi, Can anyone derive the sum of exponentially distributed random variables? I have the derivation, but I'm confused about a number of steps in the derivation. Here they are: Random variable x has the PDF, f(s) = \left\{ \begin{array}{c l} e^{-s} & if s \ge 0 \\ 0 &...
  4. S

    Slit diffraction with a beam of spatially distributed intensity

    Homework Statement I have the classic slit-diffraction experiment, where light is incident on two narrow slits on a screen and is diffracted to create a pattern of maxima and minima on the far surface. It is usually assumed that the light incident on the slits is uniform. In practice, the...
  5. N

    Bezier curves and equally distributed parametric points (easy ?)

    Hello, I am an amateur developing the math to describe the motion of a robot of sorts. At this stage I'd like to use http://en.wikipedia.org/wiki/Bézier_curve" as user input to describe the motion path/s that it will make over time... (imagine it sitting flat on the cartesian 'floor')...
  6. K

    Finding Reactionary Forces on a Beam with Distributed Load

    Homework Statement A simple beam is under a distributed load q=c*sine(n*pi*x/L)? if there are two pivots at the end points supporting it, what will be the reactionary force on each one of them? Here, L is the length of the beam and x=0 is the leftmost point. 0\leqx\leqL The figure...
  7. S

    Electric Field distributed Uniformly along the X-axis

    Homework Statement A charge Q is distributed uniformly along the x-axis from x1 to x2. If x1=0m, x2= 4.82m, and the charge Q = 3.13 microcoulombs, what is the Magnitude of E of the electric field at x0= 11.7m on the x-axis. Assume that x0>x2>x1. Answer in unitsof N/C. Homework Equations...
  8. Cyrus

    Lumped v. distributed parameter

    This was mentioned casually in my controls book concerning differential equations. Using simple english please describe to me what the two are. Please avoid any and all equations unless absolutely necessary. Thanks!
  9. A

    Why is matter not uniformly distributed across space time?

    Why is matter not uniformly distributed across space time?? I was wondering why there is varying densness across space time and not uniform distribution of matter. and slighty linked to this, what is it that holds matter together, but also keeps it apart if that makes sense?? ie atoms bond...
  10. D

    Distributed computing, do you support?

    Just curious to know if you guys here support Distributed computing? like boinc. do you? and what particular project do you support.
  11. Somefantastik

    Independent identically distributed random variables

    For two independent and identically distributed random variables having the exponential distribution, do they have the same lambda value, or are the lambda values different?
  12. maverick280857

    Query regarding Independent and Identically Distributed random variables

    Hi I have a question regarding i.i.d. random variables. Suppose X_1,X_2,\ldots is sequence of independent and identically distributed random variables with probability density function f_{X}(x), mean = \mu and variance = \sigma^2 < \infty. Define Y_{n} = \frac{1}{n}\sum_{i=1}^{n}X_{i}...
  13. T

    Electric field of a uniformly distributed rod

    Homework Statement rod -a-------|---------a on x-axis, for x>-a has -Q charge, for X<a has +Q charge, find the electric field at point (x,0) x is positive Homework Equations lambda = Q/a linear charge density dQ = (lambda)(ds) E=KQ/r^2 The Attempt at a Solution i make...
  14. S

    How do distributed loads affect angled connecting rod systems?

    I've attached a picture of the problem - I'm NOT looking for a solution, just an explanation. You can see the dimensions x,y, and z. That box is a detail of the connection at the rod interface. There is a distributed load acting across the lower beam of w lb/ft. Given the allowable...
  15. S

    Uniform Distributed Electric Charge

    Homework Statement A ring-shaped conductor with radius a = 2.20 cm has a total positive charge Q = 0.123 nC uniformly distributed around it. (Question relevant to main problem) (a)What is the magnitude of the electric field at point P, which is on the positive x-axis at x = 35.0 cm...
  16. V

    Are craters on the moon randomly distributed?

    In world war two the British used a Poisson distribution to analyse where V-rockets were landing in London and showed that the pattern of targets hit was random and that therefore the rockets were not being guided accurately. Hasanything similar been done for the craters on the moon - their...
  17. J

    How to tell if data is normally distributed?

    Is there a formal way of telling if my data is normally distributed? I know I could plot a histogram for the data, and see if it follows a bell shaped curve, but I need something a lot more formal than this. Is there a way to do it? Thanks
  18. N

    Positive charge distributed uniformly along y axis

    I have a physics question that states: An amount of positive charge is distributed uniformly along the positive y-axis between y=o and y=a. A negative point charge -q lies on teh positive x=axis a distance r from the origin. Derive the x and y compontes of the force that the charge distribution...
  19. T

    How Do You Calculate the Point-Force Location for Unevenly Distributed Loads?

    In static problems, an evenly distributed load can be made into a point-force by multiplying the load by its length, and so this point-force will now act in the center of the distributed load. This is cool, but I can't find out how to do the same thing with loads that are unevenly distributed...
  20. C

    Distributed Strain Sensing with FO Bragg Gratings

    Not really something I would expect most people to know so I will keep it out of the Homework help section (it is not homework) I am working on distributed strain sensing with fibre optic Bragg gratings for aircraft. For those that don't know, FO Bragg gratings are a periodic variation in...
  21. L

    Problem to understand how the power is distributed

    I can’t get in the picture below which power I will get on the wheel, i am guessing that there will be an resultant on 45 degree with a force of around400*9,82 N. http://img33.imageshack.us/img33/2695/problemhjul4rh.jpg Thx for any help given
  22. L

    Uniformly Distributed Current in a Wire: Question Explained

    ive posted this in the other forum, but haven't received a reply, so trying again :) Question: -straight wire with radius R, carrying current I -current is uniformly distributed across the cross sectional area of wire -calculate the magnetic field inside wire as function of distance r from...
  23. A

    Math Help: P(40 ≤ X ≤ 50, 20 ≤ Y ≤ 25) & P(4(X-45)^2+100(Y-20)^2 ≤ 2)

    Suppose that X and Y are independent random variables, where X is normally distributed with mean 45 and standard deviation 0.5 and Y is normally distributed with mean 20 and standard deviation 0.1. (a) Find \ P(40 \leq X \leq 50, \ 20 \leq Y \leq 25). Ans. ~0.5 (b) Find \...
  24. F

    Question about poisson distributed variables

    Hi, I'm trying to prove if X~Po(m) => 2X~Po(2m) But I'm not sure how to prove or disprove it. I'm thinking about using the addition formula, but is this the right approach? X_1~Po(m) X_2~Po(n) X_1+X_2~Po(m+n) n=m => X_1=X_2 => 2X_1~Po(2m) Any help is appreciate. Thanks /farbror
  25. B

    Distributed Computing Apps: Our Members' Favourites

    Do any of our members use any distributed computing apps? If so, what do you use, and for what reason? What are your favourites? I ran SETI@home (like almost everyone else on earth, I think. ;) ) for quite a while, achieving 221 data units in 7,000 hours. But recently I've switched to...
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