Network Definition and 463 Threads

Network (stylized NETWORK) is a national Catholic social justice lobby headquartered in Washington, D.C. The organization focuses its lobbying efforts in the areas of economic justice, immigration reform, healthcare, peace making and ecology. Sister Simone Campbell is the executive director of NETWORK.

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  1. C

    Impedance network and complex algebra

    Homework Statement This is one part of a wider question, I'm only posting the part I'm having trouble with. $$ \begin{align} \text{Given an impedance network } B &= \frac{Z_1 \parallel Z_3}{Z_2 + Z_1 \parallel Z_3} \\ \text{show that: } \frac{1}{B} &= 1 + \frac{R_2}{R_1} + j\frac{\omega CR_2}{1...
  2. V

    How Do You Calculate Total Resistance in a Complex Circuit?

    Homework Statement In the above diagram, calculate the total resistance between A and C R1 = R2 = R3 = R5 = 3.3 Ω R4 = R7 = R8 = 6.6 Ω R6 = R9 = R10 = 2.4 Ω Homework Equations Sum/Product The Attempt at a Solution Can anyone give me an insight on where to start for this? So my current...
  3. ranju

    Network Theorems: Understand Physical Significance & Benefits

    Homework Statement There's nothing a problem actually , all I wanted to know is what is the physical significance of network theorems , why are we actually studying them..?Homework EquationsThe Attempt at a Solution generally , we use network theorems for simplifying the circuit..
  4. S

    Transient Stability in industrial network

    Hi All I have done transient stability simulations on isolated electrical network using ETAP 7.5 software. Problem: On buses Faults generators return to stable stade But on cable faults, rotor angle is diverged so the system is not stable. To be noted that we have 2 SOLAR generators of 5MW...
  5. R

    Find the magnitude of charge stored in the entire network

    Problem: In the circuit shown in the figure below, the capacitors C1 and C2 have a capacitance of 45µF. C3 and C4 have a capacitance of 90µF. The two terminals A and B on the left have a potential difference of 25V (Sorry - had to quickly draw it, could not save/find image) (a) Find the...
  6. N

    Question on Neural network transplant ?

    Hello I'm new here as you can tell by my username and I had a question on some research I'm doing. Now it is common knowledge that brain cells and even whole neural network can be transplanted. But my question is on the neural networks. Like for example I was reading that sxuality is determined...
  7. STEMucator

    Find total resistance in a network

    I can't get this last problem in the chapter. I am asked to find ##I_x## in the following network: My first hunch was to apply KCL to the node above the ##2I_x## source: ##10 + 2I_x - \frac{V}{2} - 3 + I_x + \frac{V}{5} + \frac{V}{10} = 0## Where I have assumed the voltage ##V## is across...
  8. STEMucator

    What is the Voltage Output in a Complex Network Using KCL and Voltage Dividers?

    I was able to do most of the exercises, but this one gave me some trouble. I want to find ##V_o##. My gut is telling me to use KCL, and applying it to the top left node above the 6k resistor yields: ##\frac{V_o}{2000} + 2 \times 10^{-3} - \frac{V_s}{6000} - \frac{V_s}{3000} = 0## I am now...
  9. EverGreen1231

    Question on the differentiation between a Network line from Radial

    I have been told that if the line connects breaker to breaker, it is considered to be radial; but, this doesn't make sense to me. If a line is connected by two feeders then there would be two sources of power, hence "Radial". I'm not sure if I'm missing some minute detail that makes the whole...
  10. A

    Network -- Current passing through a capacitor

    Homework Statement A current i(t) as shown in the figure is passed through a capacitor. the charge (in micro coulomb) acquired by the capacitor after 5 micro seconds Homework Equations here slope is given for 3 microsecond ie. current=dq/dt = 2.5 charge upto here = 3*2.5=7.5 micro...
  11. A

    Network -- RC network with sources

    Homework Statement The current Ix and Vx in the below circuit are The Attempt at a Solution Volt at node A= V. Applying KCL at node A, V/5+ ((V-20) /10) -7=0, 3V =90, V=30.
  12. vead

    Network Enabled Device: Implementing Circuits with ARM Controller

    I want to implement circuit that can be operate throw web browser there are many network controller but I want to use ARM controller I need advice I mean where we can use this type of circuit ,tell me commercial use of network enabled device
  13. K

    C/C++ Where Can I Find NS-3 Sliding Window Simulation Code in C++?

    Hello guys i want to compose a code (in C++) for Ns3 to simulate the fuctionality of sliding window , maybe can help me somebody!
  14. M

    In electronics, why do we need a two port network?

    Why do we need a two port network? Is there something which a one port network lacks? Why we needed a two port network connection?
  15. D

    Unlocking a computer for network folder sharing

    Hi folks, I'm interested in unlocking a computer for network folder sharing. After I installed ZoneAlarm for firewall, I haven't been able to open folders from the computer running it. "Locked" computer information: - Windows 7 - ZoneAlarm (zones on Medium and all IP's of interest have...
  16. M

    Relevance of Computer Network Expertise for Grad Studies in EE

    Hello, I need some advice regarding my plan to apply for a masters in EE. I have a BS in physics, and I have been in the workforce for about 5-6 years now. I work in the IT field, with a focus on networking, security, LAN/WAN, etc. I have been offered an exciting opportunity of becoming...
  17. R

    Which Impedance Method is Correct for Two-Port Networks?

    Homework Statement If we have a two-port network, a source with impedance Zs and a load with impedance Zl, I think that the conjugate of Zg and Zl (normal, not conjugated) should be equal to the image impedances of the network. The problem is that I was told that instead of the conjugate of...
  18. hagobarcos

    Network Analysis/Loop Rule Problem

    Homework Statement This is out of a book on Excel, where we are solving simultaneous equations. However, how do we find the equations for this network in the first place? (image at bottom) Homework Equations ∑ I= 0 ∑ V =0The Attempt at a Solution i1 + i2 + i3 = 2 i6 + i7 +i10 = 3
  19. L

    Engineering Short circuit calculation small network: gen motor transformer cables

    Hello guys, I have to make a short circuit calculation for school but I am a bit lost.. I have a copy off the IEC61363 and internet connection as my help lines. Homework Statement The network consists of a generator feeding to switchboard A with a cable in between, on the same...
  20. D

    Designing a Foster 1 Network for Impedance Testing

    Homework Statement Design and show a foster 1 network z=(x^2+4)/(x(x^2+2))Homework Equations The Attempt at a Solution So first I did the partial fraction expansion and I got (2/x)-(x/(x^2+2)). Next I got everything in the denominator so (1/x/2)-(1/(x+(2/x)) when I do this though I get all...
  21. Z

    How Do You Calculate R and C for a Series Impedance of 500∠-36.1° at 10kHz?

    Homework Statement Compute values for R and C such that the total series impedance Z=500\angle(-36.1o) when f=10kHz. Homework Equations ω=2\pif KVL ZC = -j*(1/(ωC)) = 1/(jωC) where j=\sqrt{-1} The Attempt at a Solution Seems like a pretty straightforward problem, I seem to...
  22. A

    Signal flow graph for two-port network

    Hi, this is part of an application note entitled "Low-Noise Amplifier Stability Concept to Practical Considerations" from Maxim. Could you help me with the question in the picture? Thanks. Source: http://www.maximintegrated.com/app-notes/index.mvp/id/1849...
  23. G

    How Do You Calculate Energy Stored in Specific Capacitors Within a Network?

    Homework Statement For the capacitor network shown in Fig. P24.55, the potential difference across ab is 12.0V. Find (a) the total energy stored in this network and (b) the energy stored in the 4.80-μF capacitor. Homework Equations C= Q/V U= Q2/2C = .5CV2 = .5QV Capacitors in Series: 1/Ceq =...
  24. C

    Engineering Cannot decide between Network Engineering and Telecom Engineering

    Hello guys. This is my first time posting in PF. So, let me tell my problem first. I have just finished high school and I will be entering college soon. The problem is, I cannot decide which course suits me the best. Whether it is Network Engineering or Telecommunication Engineering. To tell...
  25. T

    Jackson network in steady state

    Homework Statement Consider a network of n queues with a Poisson arrival process of parameter t from outside the network, and independent exponentially distributed service times of parameters r1 to rn. Customer that first arrived to the network initially join queue i with probability Pi...
  26. C

    Network, 2 loads, find complex power

    Homework Statement http://imageshack.us/a/img819/9791/sh5k.jpg Given the network [above], find the complex power supplied by the source, the power factor of the source, and the voltage Vs(t). The frequency is 60 Hz. Homework Equations ω=1/f Pf = cosø P = IV PL =...
  27. S

    Design a 15 dB π Attenuator with 600Ω Impedance

    Homework Statement Design a π section symmetrical attenuator to provide a voltage attenuation of 15 dB and a characteristic impedance of 600 Ω. Zc=600Ω,\alpha=15dB (attenuation) Z1,Z3=? Homework EquationsThe Attempt at a Solution \alpha[dB]=20log(Vin/Vout)=15 \alpha=5.623...
  28. D

    What is a Pigment network in Dermoscopy Images?

    hi all, So here I am reading a paper "A System for the Detection of Pigment Network in Dermoscopy Images". I want to ask what actually is a pigment network? thanks
  29. H

    Understanding N1 and N2 in DC Network: A Comprehensive Guide

    Please suggest what does N1 and N2 mean in the attached dc network.
  30. A

    Two-port network models (V in & V out)

    Homework Statement Construct and test the ∏ section symmetrical attenuator. Measure and record the Input & Output Voltages of the attenuator and determine the attenuation in dB. Homework Equations Vout = Vin * [ R2 / (R1 + R2) ] Decibel Attenuation (dB) = 20LOG10(Vout / vin)...
  31. E

    Does Research Exist on Biological Neural Network Chips?

    I have seen articles dealing with the growth of brain cells using stem cells. I have also seen, in the past, research attempting to mimic neural connections (using traditional silicon chips) for use in computing. I have searched for any mention of research into using actual living brain cells...
  32. A

    Design a 15 dB Symmetrical Attenuator with 600Ω Characteristic Impedance

    [/SUB]Homework Statement Design a ∏ section symmetrical attenuator to provide a voltage attenuation of 15 dB and a characteristic impedance of 600 Ω. Homework Equations ZS = ZL = Z R1 = R3 = Z (K + 1 / K -1) R2 = Z (K2 - 1 / 2 K) The Attempt at a Solution Z = 600Ω K =...
  33. A

    Insertion Loss in a (T) Two Port Network

    Homework Statement Calculate the insertion loss for the network in the diagram? Homework Equations 20log(N)dB N = R0 + R1 / R0 - R1 The Attempt at a Solution N = R0 + R1 / R0 - R1 N = 141.42 + 100 / 141.42 - 100 N = 241.42 / 41.42...
  34. A

    Characteristic Impedance for a (∏) two port network

    Homework Statement Calculate the Characteristic Impedance (Z0) of the two port network? Homework Equations When port 2 open-circuit, I2 = 0 So, Z11 = V1 / I1 = 40(60) / 100 = 24 Ω When I2 = 0, thus V2 V2 = 40 / 20+40 V1 = 0.666 V1 Z21 = V2 / I1 = 0.666 V1 / (V1...
  35. A

    Two Port Network: Calculate Characteristic Impedance (Z0)

    Homework Statement Calculate the characteristic impedance ( Z0) of the two port network shown below: Could you help me with this question please.Homework Equations The Attempt at a Solution
  36. Y

    Network optimization / Min cost flow problem

    Homework Statement Consider a power grid consisting of electricity producers that are connected to consumption points on the grid. The consumption points are affiliated with regional retail power companies that then distribute the power to their end users. The undirected graph (attached)...
  37. A

    Help me set-up a home network between my devices

    Hi! I have a few devices in my home like a desktop, a laptop, a printer, a tablet(Nexus 7) and a smartphone. I usually need transfer files between the device so i use data cables, usb drives or memory cards. But I have a broadband router in my home which I think can be used to set up a wireless...
  38. L

    Inverting OP AMP with 'hanging' resistor in feedback network

    Homework Statement Find Vo/Vin.I understand perfectly how to do this question. It simply involves an application of ohm's law to find i1, then KVL around the first loop. KCL at the top, and KVL around the second loop. Then to solve simultaneously. My issue however Is why the mechanics of...
  39. S

    Trouble with Neural Network coding

    I'm trying to make a neural network in python, but I'm having a lot of trouble. Specifically after I have the network set up, what weights to initially assign to each neuron's inputs, the threshold, and evolving the networks to do what you want. Here is my neuron class. class Neuron...
  40. S

    Network admin vs Programming what pays better

    So I am currently a computer engineer student, with multiple IT certifications (A+, N+, S+, MCP, MCSA, MCSE, CCNA) i will finish my degree this December and I am trying to make a decision, I am currently working as a software engineer for a small company where the top ill make after i graduate...
  41. A

    Two-port network transmission parameters?

    two-port network transmission parameters?? Homework Statement Homework Equations t[A B]=[t11 t12] [C D]=[t21 t22] The Attempt at a Solution so, first thing i did was find the equivalent capacitance/inductance. C(eq)=-j0.5 and L(eq)=j0.5. using these values as I was confused by parametric...
  42. D

    Neural Network based controller

    I'm working on a project which deals with temperature control of a room. the idea is to control temperature within a limit. I have prior data which i used to train a neural network which is 99.5% accurate. there are 5 inputs (x , y , z , A , B) and there is one output (T). Now I want to...
  43. D

    Neural Network based controller

    I'm working on a project which deals with temperature control of a room. the idea is to control temperature within a limit. I have prior data which i used to train a neural network which is 99.5% accurate. there are 5 inputs (x , y , z , A , B) and there is one output (T). Now I want to...
  44. J

    Voltage transfer functuon of network

    I don't have access to computer right now so here's the link to my working http://tinypic.com/r/2nhowoo/5 . According to the answer I shouldn't have (s/RC) term on the numerator, otherwise all good. Can anyone please point out where i have gone wrong?
  45. R

    Using a self-coded neural network

    I developed a multi-layer perceptron so I could better understand the underlying structure as well as modify it easily versus MATLAB's nntoolbox generate code. I have successfully trained the network for a given set of inputs and targets. The question now is how do I use this trained network...
  46. P

    Me solving 2 electrical network problems

    please help me solving 2 electrical network problems file:///C:/Documents%20and%20Settings/user/My%20Documents/My%20Pictures/From%20RSPC_Pashya/Camera%20roll/WP_000127.jpg In first problem I have to find current through 5Ω resistor using Thevinins eq. So, in first step i removed 5Ω...
  47. H

    Network Motifs vs Clusters: Exploring Network Sub-Communities

    Could someone explain what network motifs are and how they are different from clusters because wherever I've searched, both are defined as sub-communities within a network.
  48. R

    Neural network inputs and targets

    I've written a program for character recognition but now upon testing I am unsure about a couple things. I'm having problems with training and simulating the network. Here is my interpretation of how network training goes. Suppose I want to recognize the letters in the ABCD image attached. In...
  49. R

    Neural network problems with multi-input dependencies

    I'm working on a fingerprint recognition project and have run into a road block. As of now, I am using a 3 layer feed-forward neural network to find the minutiae in a fingerprint. If a minutiae is detected, it's location in the image (row, col) and the type (n types) of bifurcation is noted...
  50. A

    How significant are frats in helping you network later in life?

    So, I see a lot of my peers joining frats. Even my sister has joined one. With so many people joining now, what are the chances that it would help them hook up with a job later on in life? I mean, in the 1950's, the chances were high, but now it's 2013 - everyone's going to college and a large...
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