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Wednesday, March 21, 2012

How to crack job fare

How to get success in job Fare?
Dear friend first of all you should set up the following parameter.
just think what you want to do after 10 year weather you wann to join the
software industry of wann to move to hardware part.

Focusing on that particular abstarct you can decide which type of jobs you can apply and where the hard work is need.
This is for sure if you think of sliding to a particular way the work itself pay you for your hard work.

We are all engineering students and the companies which comes to every college are infosys and TCS in my campus infosys was the company which came for the recruitment and some of all were selected in the process but what about those who cant make it ??????
 The big question which comes to everyone mind is that what we should do now?????? i too experiance so much of it .
 I dont loose the hope i was like the neophyte but on the otherhand i was also helpless i was alone dont have the contacts with my senior at all, this was very difficult for me to choose the right path.
I start attending job fare and attended about tens to teweles but nothing comes out ya i got the xeperiance but at my night sleep i think only that i was the unemployed.
 Look friend you cant be a millianior in one night or a day , dont comes under the pressure that your other friends are placed , its fact we waste our lots of time thinking that our fellow are placed and we still in miseary, nothing comes out of it .

There are some tips that i wann to share with you :
1) whenever you go for the job interview always check about the company profile.
2) first step when you enter the job fair: search for the interviewer his name and linkedin it, its a professional site most of the well known employer have the account in it and check weather he or she belongs to the company you are applying for.
3) Reach in time  most important.
4) Always make friends of  that particular college whenever you go for fair.
5) Take experiance of interview including BPO or Sales definitely add to you some quality.
6) Be active and appear in all interview.
7) Always keep updated copy of your resume.
8) learn languages like c c++ java and most of it improve your english.
                                                                                  to be continued....................................

Friday, March 16, 2012

PPT Dril

Presentation Templet's For You

Hi friends its been seen that now a days the the art of expressing the work is going to be modern, people start using the modern technology ,and we too start opting that what we called it a power-point PPT .
Everyone is aware of that and implement it for exposure,but the content they want to deliver was not in structured way it should be like the way it is start being processed.
The resign behind the lack of attention to your work is never get interpretive until it is not well structured.
So you must watch the templet's and analysis your mistakes. 


http://www.mediafire.com/?d639oib38foinc1

Wednesday, February 29, 2012

Cognitive Radio for emergency and public safety applications/wireless medical networks.



Cognitive radio, which is also referred to as dynamic spectrum  access technology or agile radios that automatically find and access un-used spectrum across different networks (licensed and un-licensed  including the features of optimization and adaption)  can be beneficial when all source of the communication are affected. Currently some companies are working on implementation of

cognitive radios that will work on TV broadcasting bands in order to use the white space that is not of any use in the frequency spectrum of the TV transmission channel, such type of developments are expected to bring beneficial methodologies and solutions to the problems of public safety and emergency case communications, especially related to interoperability issues[2]. However, wide range of opportunities introduced by the awareness, learning and intelligence features of cognitive radios necessitate the reassessment of opportunities to the public safety and emergency case communications from a more complementary aspect. One aspect can be the development of applications that will lead to communicate, locate and reach victims who are stuck in harassed condition one of them may be psychosocial risks of cardiovascular disease we integrated on-the-body sensors with mobile therapies for "just-in-time" stress management. Breathing visualizations and cognitive reappraisal cues appeared on the cell phone when a wireless ECG detected deviations from an individuals' baseline heart rate variability. Reactions from participants validated this concept and highlighted the need for a broader array of therapies and applications that could be shared within relationships and communities. Now this strategy can be made marvelous if we think of implementing an [4] intelligent software agent whose work is to output the data in audio signal so that the use of the device became more easy. [1]



As we see above a how with the help of cognitive radio the woman can check her mood ,the mechanism behind the whole process is that the woman fixes   A wireless ECG detector on her body near heart which  detects changes in stress levels as measured by deviations in heart rate variability and triggers mobile therapies and as a result she get the result in the audio form. This audio output methodology can be implement on various aspect of our day to day life and during the emergency and public safety applications like in forest fire, hurricane etc. This is like, we are communicating with a device and it is replying what we desire. This can may be consider as a substitute for the apple ‘siri’ but we can’t incorporate it completely as it is not possible to have a data connection everywhere. Adding voice channels to the cognitive radio revolutionaries the whole concept and reform it into an intelligent device. So in this paper we will study how the voice option helps the cognitive radio in order to excavating from the problems of the public safety.



References:

[1] Margaret Morris, Farzin Guilak :Mobile Heart Health: Project Highlight


In Pervasive Computing, IEEE ,PP.57- 61 Date of Current Version :   17 April 2009.

         

[2] Ali Gorcin Huseyin Arslan : Public Safety and Emergency Case Communications


in:  New Frontiers in Dynamic Spectrum Access Networks, 2008. DySPAN 2008. 3rd IEEE Symposium Cognitive Radio,PP 01-10 Date of Current Version :   24 October 2008.



[3] SDR form ,Approved Document SDRF-06-P-0009-V1.0.0 10 September 2008.



[4] Bradbury, D. , Software servants - [IT software]


in:  Engineering & Technology PP 58-59 Date of Current Version :   14 July 2009.

















Wednesday, February 15, 2012

Tuesday, February 14, 2012

Remote Procedure Call (RPC) - Session Layer protocol


Remote Procedure Call (RPC) - Session Layer protocol
Remote Procedure Call (RPC) is a protocol which works in session layer of OSI model and in the Application Layer of TCP/IP model. It is useful in developing network applications which need services from a remote computer in the network. With the help of Remote Procedure Call the programmer need not worry about the complex structure of OSI layer.

WORKING OF REMOTE PROCEDURE CALL



1. RPC is working as a client server model

2. RPC uses different Authentication methods to validate the client request.

3. RPC protocol is independent of transport layer protocols.

4. RPC reuests can use both UDP and TCP but prefer UDP format 

In RPC the client issues requests for certain services from server through the network.A client is a computer or process that accesses the services or resources of another process or computer on the network. A server is a computer that provides services and resources, and that implements network services.In short the requesting program is a client and the service-providing program is the server. According to the results of RPC authentication server may reject or accept the request.


Thursday, February 2, 2012

555 and 556 Timer Circuits


555  Timer Circuits

Introduction

555 circuit symbol
Example circuit symbol (above)Actual pin arrangements (below)
555 and 556 pins
There is more information about
555 timers and their circuits on the
Electronics in Meccano website.
The 8-pin 555 timer must be one of the most useful ICs ever made and it is used in many projects. With just a few external components it can be used to build many circuits, not all of them involve timing!
A popular version is the NE555 and this is suitable in most cases where a '555 timer' is specified. The 556 is a dual version of the 555 housed in a 14-pin package, the two timers (A and B) share the same power supply pins. The circuit diagrams on this page show a 555, but they could all be adapted to use one half of a 556.
Low power versions of the 555 are made, such as the ICM7555, but these should only be used when specified (to increase battery life) because their maximum output current of about 20mA (with a 9V supply) is too low for many standard 555 circuits. The ICM7555 has the same pin arrangement as a standard 555.
The circuit symbol for a 555 (and 556) is a box with the pins arranged to suit the circuit diagram: for example 555 pin 8 at the top for the +Vs supply, 555 pin 3 output on the right. Usually just the pin numbers are used and they are not labelled with their function.
The 555 and 556 can be used with a supply voltage (Vs) in the range 4.5 to 15V (18V absolute maximum).
Standard 555 and 556 ICs create a significant 'glitch' on the supply when their output changes state. This is rarely a problem in simple circuits with no other ICs, but in more complex circuits a smoothing capacitor (eg 100µF) should be connected across the +Vs and 0V supply near the 555 or 556.
The input and output pin functions are described briefly below and there are fuller explanations covering the various circuits:
  • Astable - producing a square wave
  • Monostable - producing a single pulse when triggered
  • Bistable - a simple memory which can be set and reset
  • Buffer - an inverting buffer (Schmitt trigger)
Datasheets are available from:

Inputs of 555/556

555 circuit symbolTrigger input: when < 1/3 Vs ('active low') this makes the output high (+Vs). It monitors the discharging of the timing capacitor in an astable circuit. It has a high input impedance > 2Mohm.
Threshold input: when > 2/3 Vs ('active high') this makes the output low (0V)*. It monitors the charging of the timing capacitor in astable and monostable circuits. It has a high input impedance > 10Mohm
* providing the trigger input is > 1/3 Vs, otherwise the trigger input will override the threshold input and hold the output high (+Vs).
Reset input: when less than about 0.7V ('active low') this makes the output low (0V), overriding other inputs. When not required it should be connected to +Vs. It has an input impedance of about 10kohm.
Control input: this can be used to adjust the threshold voltage which is set internally to be 2/3 Vs. Usually this function is not required and the control input is connected to 0V with a 0.01µF capacitor to eliminate electrical noise. It can be left unconnected if noise is not a problem.
The discharge pin is not an input, but it is listed here for convenience. It is connected to 0V when the timer output is low and is used to discharge the timing capacitor in astable and monostable circuits. 

555 and 556 output sinking and sourcing
connecting a loudspeaker to 555 and 556 outputs
555 and 556 output protection

Output of 555/556

The output of a standard 555 or 556 can sink and source up to 200mA. This is more than most ICs and it is sufficient to supply many output transducers directly, including LEDs (with a resistor in series), low current lamps, piezo transducers, loudspeakers (with a capacitor in series), relay coils (with diode protection) and some motors (with diode protection). The output voltage does not quite reach 0V and +Vs, especially if a large current is flowing.
To switch larger currents you can connect a transistor.
The ability to both sink and source current means that two devices can be connected to the output so that one is on when the output is low and the other is on when the output is high. The top diagram shows two LEDs connected in this way. This arrangement is used in the Level Crossing project to make the red LEDs flash alternately.

Loudspeakers

A loudspeaker (minimum resistance 64ohm) may be connected to the output of a 555 or 556 astable circuit but a capacitor (about 100µF) must be connected in series. The output is equivalent to a steady DC of about ½Vs combined with a square wave AC (audio) signal. The capacitor blocks the DC, but allows the AC to pass as explained in capacitor coupling.
Piezo transducers may be connected directly to the output and do not require a capacitor in series.

Relay coils and other inductive loads

Like all ICs, the 555 and 556 must be protected from the brief high voltage 'spike' produced when an inductive load such as a relay coil is switched off. The standardprotection diode must be connected 'backwards' across the the relay coil as shown in the diagram.
However, the 555 and 556 require an extra diode connected in series with the coil to ensure that a small 'glitch' cannot be fed back into the IC. Without this extra diode monostable circuits may re-trigger themselves as the coil is switched off! The coil current passes through the extra diode so it must be a 1N4001 or similar rectifier diode capable of passing the current, a signal diode such as a 1N4148 is usually not suitable.