Write Ups: Operating Systems~Evaluate two operating systems..

 Question: Evaluate two operating systems

Answer:

Let us evaluate the two different operating systems Microsoft windows and apple Mac by comparing/contrasting between the two.

Every windows machine takes around 3-5 minutes to start up or reboot where as every Mac machine takes around 15-17 seconds to start up or reboot. Hence we can say that the Mac system starts faster and also load all the installed application automatically as soon as the system starts up, where as in windows only when the user requests or clicks on a particular application then only it loads up to open. So in Mac machine all the application are preloaded as soon as the system reboots, hence user can use any of the installed applications without waiting for it to load.

When we talk about the size of the operating again windows OS needs a space of 5GB for installation where as Mac OS needs a space of around 2GB. When we look at the installation and un- installation of OS, then definitely windows takes more time to format and reinstall when compared to Mac OS. But when we look at the accessibility perspective then windows is very much better than Mac.

Windows is compatible with all the applications say when we talk about compatibility and application support then windows is very much better than Mac systems. Hence windows OS has a very high legacy application support.

When we talk about the audio part, then definitely both Windows and Mac OS will be compared equally in audio playback. Hence the audio output quality of both the OS are same. But definitely the video quality and video playback is excellent in windows OS when compared to Mac OS.

Windows support almost all the software’s mainly audio editing software’s, video editing software’s, all kinds of antivirus, also all kinds of audio and video players etc. Hence the windows OS is always compatible with the latest application may be any business application or commercially used applications, or any personal use applications.

The user interface and user friendliness is very high in windows OS when compared to Mac OS. Hence any new user will be able to use windows application without much guidance when compared to Mac OS.

The software updates are usually with respect to technology. Hence the updates in windows OS software in much more than the updates coming up for Mac OS. This might be one of the drawbacks to windows since users have to upgrade to new version by paying extra amount to enjoy new features always.

Finally let us talk about the picture quality. Picture quality in both the OS when imported from some other device or when downloaded from web remains the same. Hence the quality of the image remains the same in both the OS.

References:

1) Comparison of all versions of Windows , 2009

2) Comparison of  freeware operating systems,2009

3) Usage  and handling of operating systems, 2008

Computer Science Assignment Help: Consensus algorithm

“Consensus algorithm”:  A group of ten people need to decide which one flavor of ice cream they will all order, out of three options. The algorithm can question and re-question the participants, and present the answers to the participants, until a consensus is reached. This exercise is somewhat more open-ended. Add your assumptions if necessary. Obviously, this algorithm might never result in an answer. Deal with that too.

Answer:

Step1: Please ask the group of people to select one flavor of ice cream and go to step 2.

Step2: Please plan for ordering the selected flavor and go to step 3 else go to step 1.

Step3: Please confirm from all the ten people whether they are ok with the selected flavor of ice cream, if yes go to step 4, else go to step 1.

Step4: Please go for the second round of confirmation from each one of them among the 10, if they are ok then go to step 5, else go to step 1.

Step5: Please order the selected flavor of ice-cream as a group of 10, if there is no discrepancy in the choice and go to step 6, else again go to step 1

Step6: Please wait for the waiter to serve the ice cream, if yes go to step 7, else go to step 8.

Step7: Enjoy having the delicious flavor of ice-cream, go to step 9.

Step8: Please remind the waiter again, and go to step 9.

Step9: Come out of the ice-cream shop as a group of 10 once you finish having it, else go to step 7.

Explanation:

Here we will not consider the percentage of members in a group opting for a flavor choice; instead we go for probability considering three to four members at a time. Hence we give three chances for the group of 10 members to select their choice, we are not ordering at the first choice we are giving two more other chances to choose so that as per the probability, at least after the third round for asking for the choice they all group of ten will come to the conclusion and they must be able to order it at that stage or else this keeps repeating until they all come to the conclusion.

Networking Assignment Help: What specific steps can be taken to improve security in WLANs...

Q)What specific steps can be taken to improve security in WLANs?

Sol:

 The below steps can be taken to improve the security in WLANs:

a) Initially wireless network has to be authorized and authenticated.

b) Also all the users try to get connected to that particular has to be authorized and authenticated.

c) Every user connected to the network has to be uniquely identified by their own unique username and password.

d) Multiple users with same username and password should not be allowed to connect to the network.

e) Every user has to be properly disconnected so that no one in queue must be able to continue to get connected to the network with their username and password.

Assignment Help: Calculate the resistivity of the wire material..

Q) A wire 4.00 m long and 6.00 mm in diameter has a resistance of 15.0Ω. A
potential difference of 23.0 V is applied between the ends. (a) What is the current in
the wire? (b) What is the magnitude of the current density? (c) Calculate the resistivity
of the wire material. (d) Attempt to use a Table in the chapter to identify the material.

Sol:

Given that L=4m, r=d/2=3mm, V=23V, I =? , Current density J=? , Resistivity =?

From ohms law, we have V=IR

a) Current I = V/R

          =23/15=1.53A

b) Current density, J = Conductivity*Electric field,......................................................................................................................................

Please comment over here for complete solution of this assignment.

Homework Help: How many customers are waiting in line..

1)A club has two services desks; one at each entrance of the store. Customer arrives at each desk at the average of one every 6 minutes.

The service rate is 4 minutes per customer;

 The club is not considering consolidating the two service desks into one location staffed by two clerks who will be working at the same rate.

       a)      What is the probability of waiting in line?

       b)     How many customers are waiting in line?

       c)      how much time a customer spend at a service desk?(waiting +service time)

       d)     Do you think the club should consolidate the service desks?

Sol:

λ = Arrival rate=6mins, μ = Service rate=4*2=8mins

   a) The probability of waiting in line is given by,

 Where L_q = Average number waiting in line, S = Number of service channels=2

 

       = 1.125 customers

 

Therefore,  

= 1.125*((2*8/6)-1) =1.185

  b) The number of customers waiting in line, L_q =  1.125 customers.

 

  c) The time spent,

Where Ls= Average number in system (including any being served) given by,

Ls = 1.125+6/8=1.875

Ws = 1.875/6= 0.3125mins

  d) No, the club should not consolidate the service desks, since there is a very good customer sharing taking place between the two service desks.

2) A cafeteria has a coffee urn from which customers serve themselves; arrival at the urn follow a poisson distribution at the rate 3 per minutes. customer’s takes about 15 second to serve themselves; exponential distribution.

a)      How many customers would you expect to see at the on the average at the coffee urn?

b)     How long would you expect it to take to get a cup of coffee?

c)      What percentage of time is the urn being used?

d)     What is the probability that three or more customers are in the cafeteria?

e)      If the cafeteria installs an automatic vendor that dispenses a cup of coffee at a constant of 15 seconds, how does this change your answer to a) and b)?

Sol:

a) The number of customers will be

    

Where λ = Arrival rate=3/min, μ = Service rate=4/min

Ls = 3 customers

b) Waiting time,

 

Where

L_q = 2.25

Wq = 0.75mins

c) Percentage time= Wq/ Ws where

Ws=1

Percentage= 75%

d)           

Where n=3, Pn= 0.14

e)          Ls= 4 at max

Therefore from the above formulae, L_q=3.25

Wq= 1.08mins

The reason why I used all the above formulae is because, these formulae’s are called wait line formulae’s, which is mainly, used to calculate the wait times. It has got four models, Model 1-4. Hence based on the requirements the corresponding models are used. Note that all the formulae’s belonging to same model has to be used in one problem.

Biology Homework: Where will protein synthesis be completed..

Q) If a protein is going to be secreted where will protein synthesis be completed?

Sol:

Protein synthesis is the process where proteins are synthesized or produced in the living things as per the directions given by DNA (deoxyribonucleic acid) and processed by RNA (ribonucleic acid) and many other proteins.

If a protein is going to be secreted then the protein synthesis will be completed on ribosomes within these organelles and are distributed directly into various parts within the same organelles.

Physics Homework: What current in the solenoid would be needed to produce a field of..

Q)
What current in the solenoid would be needed to produce a field of 1.5×10−3 T but in the opposite direction?

Sol:

From question 2, magnetic field of 1.6*10^-3, produces 2400 turns

Hence, magnetic field of 1.5*10^-3, produces 2250 turns

Magnetic field, B=u_o*n*I

Current, I = 1.5*10^-3/(4*pi*10^-7*2250)= 0.53A