Application of Markov Chains in real time to Retail Food Chains.

Before we dig deeper, let us touch base on what these Markov chains are really about?

So there is theory called " Queuing Theory ". Yes, indeed the same queues i am talking about standing in line , waiting for our turn to fulfill our request.

Why queuing theory ? 

According to an independent survey on an average, on any given business day and at any given point of time there are approximately 894,449 Canadians waiting queue which approximates to spending 37 billion hours per year waiting in lines.  

So basically, Queuing theory is mathematics of waiting lines and Markov chains is an approach used to analyze these waiting lines.

The following is our project where me and my team analyzed the queues of a fast food chain and calculated the performance parameters.

Modelling & Real time performance analysis of an M/M/x queue.

USB Hack

USB Powered Keyboard Lighting

Bored at home?  Left with unused or non-working USB cable? 

Here’s a small thing u could do this Christmas...

Things Needed :

USB Cable                                - 1 Nos 

Straws                                       - 2 Nos

                                                        

Single stranded wire                 - 1 meter

                                                 

Switch                                       -1 Nos

                                                  

Theory :

Firstly before going into the on hands experiment, let us first know what USB is

·        USB stands for Universal Serial Bus

·        It has four thin different colored wires inside it viz. Red , Black , White and Green

·        Each of these colors indicate a specific purpose , as we know that an USB is essentially used to transfer the data , it should essentially contain a Data transmitting & a Data reception wire these wires are colored white and green respectively.

·        And any port or any machine for that matter, needs power to operate/function

For this purpose the two other wires are used. The red wire is used to input the USB with 5 Volts DC, and the black being the ground wire.

·        The general block diagram of the USB is given below.

Block Diagram :

Procedure :

·         Cut the USB wire about 5 cms away from the Jack and unstrap the wire.

·      Connect all the components as shown in the block diagram

·        Use hot glue or solder the joints of the wire to the switch and the led’s

·        Put the led’s inside the straw and wire them from the other end of the straw as shown below, this makes our led’s look like street lamps.

·        Once you’re done , color the straws to give them the best look

·        Now connect the USB end to the port and using the switch control your led’s.

·       This is most used at late nights when you’ve got to work and someone’s sleeping in the room and you’re forced to shut down the lamps.

Result :

Hope it was informative :) We love to hear back from you...

Please drop in the comments for any queries :) 

All the best guys :)

IR Detection..

                                           IR Detection

Ever while watching television at your house , stuck up by the non working TV remote ?? besides being scolded by your mom, that even after studying Engineering you are not able to identify what the problem is all about... ??

Well guys , here is a good news for you... There's a simple trick which can be performed , all that is required is a mobile camera. to find out whether your TV remote is all working ?

Procedure :

1.Open the camera on your mobile .

2. Point the camera on to the top of the remote (wherein you can find a small led like thing ).

3.While doing the same press any button on your remote.

Inference :

While following the above procedure if you can see the light ( the pointed led glowing on your mobile camera screen) means that your TV remote is all fine &  no issues with the remote.

Working :

How does the above thing works ...

Usually all the TV remotes operate on Infra Red (IR) waves which are emitted from the TV remote on the press of any button , the same waves are received by the receiver placed inside the television set which then decodes the waves into analog signal and the required change then takes place..

Now the mobile camera , is capable of capturing the visible light along with the IR waves from the spectrum.Hence on press of any button on the TV remote IR rays are emitted from the IR led transmitter on the remote which appear on your camera screen.

Questions : 

Now for all those of you who started to think , if this is the case then why don't i see the IR effect when i take usual/regular pictures , as the same IR waves also exist in the same sphere i live on ??
Well here's my say ,the mobile cameras which we use have a specific wavelength identifying capacity which means that you can very comfortably capture an IR emitter / IR source but not the IR waves ..

Spectrum showing all rays with their wavelengths