Showing posts with label Assignment. Show all posts
Showing posts with label Assignment. Show all posts

Wednesday, 7 October 2015

Communications: Net Neutrality Write Up

Q)I need information on Internet Neutrality ( Net Neutrality) covering not only the common sense aspects (why we should stop the gov) but how it will differently affect consumers and most importantly the WEB 2.0 generation of start-ups and openness ( open source applications, p2p sharing, social media/networks, etc.) and entertainment ( the surge of independent musicians and artists.)
Are there any big companies (preferably in communications or media) who are pushing the envelope and would ultimately benefit?

There should be a way to connect this to the concept of their becoming two internets, the paid and unpaid. 


Sol:
Net neutrality (also Network neutrality, Internet neutrality) is one of the principle proposed for all the users accessing networks and participating in the Internet that gives no restrictions by the ISP’s(Internet service providers) and also the governments on sites, contents and platforms, also the kinds of equipment that may be attached while sending to others, and the modes of communication involved.
Service providers argue that if net neutrality is not enforced, they will have sufficient incentives to build special high-quality channels that will take the Internet to the next level of its evolution. But if they do get their needy wish, net neutrality is then consigned to the only dustbin, and they do build the new services, but no one uses that. If the networks that are mostly built are the only ones that are publicly discussed, which is a likely prospect.

What will service providers publicly promise to do, when they are given with complete control of their own networks, is to build the special facilities for the streaming movies? But there are few fatal defects to the above promise. One is that movies are not likely to offer all that much income. The other is that delivering movies in real-time streaming audio/video is the one of the wrong solution, expensive and unnecessary.

If Internet service providers are to derive the most significant revenues and also the profits by exploiting the available freedom from the net neutrality limitations, then they will need to be engaged in much more.
Such calls for preemptive regulation are only unjustified. There is no evidence for those broadband operators who are unfairly blocking access to the websites or online services today, and there is no other reason to expect them to do so in the near future. No firm or corporate has any sort of bottleneck control over the market power in the speedy broadband marketplace; it is also very much a competitive free-for-all, and no one has any idea about what the future market will look like with so many new other technologies and operators also entering the picture. In the absence of the clear harm, government typically doesn’t regulate in the preemptive, prophylactic fashion as a CBUI members are requesting.

Moreover, from being something the regulators should forbid, vertical integration of the new features and also the services by broadband network operators is one of the essential part of the innovation strategy and companies will need to use for competing and offer customers the available services they demand.

Network operators also have got the property rights in their systems so that they need to be acknowledged and also honored. Net neutrality mandates would be flout on those property rights and hence reject freedom of contract in this marketplace.

This will also affect the consumers in such a way that they will not be able to enter some of the sites or they will be not be able to access or download some of the information since user are not restricted on the data access from the website, so that same user can go for unlimited downloads resulting in others not able to access the required information in case of emergency. Even in perspective to WEB 2.0 generation of startups and openness the social community sites are loaded with unnecessary junk data due to net neutrality as a result the maintenance  of the website as well as database becomes complex also resulting in follow ups so that there is no illegal data coming into the websites from any of the users.

Allegations of discrimination have come up with many heated intellectual debates as well as countless legislative and judicial squabbles in the United States of America. Regardless of the available veracity of the accusations in the given case, the charges are quite often sensitive and serious. Sometimes the word “discrimination” gets thrown in a very cavalier manner by the parties watching to enlist the support of government in a dispute in which it doesn’t belong. A good recent example of that comes from the field of Internet policy. A heated industry catfight has erupted between major technology companies over how Internet content should be accessed through high-speed broadband networks owned by cable or telephone companies. One of the group called the
Coalition of the broadband Users and also the innovators which adds among its members like Amazon, Apple, Microsoft, EBay, Yahoo and Disney has petitioned the FCC (Federal Communications Commission) to implement rules to ensure that cable and BSPs (broadband service providers) will not make use of their control of speedy networks to disturb consumer access to the websites or other users access. The CBUI proposal or the variations of it, has been typically labeled “digital nondiscrimination Or “Net neutrality”. Despite in the absence of the evidence that network operators are currently being imposed “discriminatory” restrictions on the network users.

CBUI members claim the FCC which adopt the preemptive safeguards which will ensure that the consumer access to Internet content is unfettered and full in the near future. In filings with the FCC and CBUI members the claim that cable and telephone companies are forging into a broadband duopoly which will also define the Internet for some time and network operators to encumber or the infringe in the relationships among their customers in between their customers and destinations on the Internet. Stanford University professor Lawrence Lessig—famed for leading and similar antidiscrimination antitrust crusade against the Microsoft that has endorsed the CBUI Net neutrality proposal, arguing, about the network owner is increasingly in the existing position of picking as well as choosing how the network gets used. Hence others, such as FCC commissioner Michael Copps, are speaking about the issue in far more apocalyptic terms.

We could be on the verge of the inflicting terrible damage on the Internet network. I am worried that we could be able to  witness the start and also the end of the available network or internet as we know it. Which proponents of the internet neutrality such as Copps, Lessig, and CBUI all members fear is that Broadband Service Providers will leverage their supposed market power is to force the customers to accept a variety of unsavory limitations on the use of the available networks owned by Broadband service providers. For eg, access to some specific sites might be restricted, the attachment of few technologies or some devices might be forbidden and also additional networks might not be allowed due to security reasons to develop at the periphery, or at edge, or at  the network (i.e., where consumers interface with the network). For eg, Broadband Service Providers might seek to curtail the attachment of wireless fidelity(WIFI) devices or networks by the consumers.

It is definitely plausible that Broadband Service providers might restrict consumer’s access to the network content or restrict attachment of various other devices or networks at the available edge of the system. Since there are some examples of Broadband Service Providers engaged in such tasks today, there might be scenarios in which it is exactly sensible for a network owner to un-restrict the existing restrictions or differential pricing available schemes on its speedy broadband customers. Network owners may also discourage the use of other certain devices on the available networks to stop system crashes and network interference. They may also need to price the services separately to protect network from congestion or in capturing higher revenues on better bandwidth intensive services. They might need to integrate the content vertically and conduits on their available systems, or make partnerships with other firms so that they can help them to reach the new customers and also offer them superior services. Also there might be scenarios in which stoppage of access to certain websites makes sense for most of the network operators. They might block access to certain websites that is in some controversy or it might contain material where some subscribers might find it as objectionable, or they might block sites simply to protect running the ads of a leading corporate competitor.

Consumers will consider few restrictions; say as a prohibition on the upcoming release of viruses on a broadband network, which is trivial and fully acceptable. Other stoppage, such as a restriction on the access to the competitor’s website or a specific competitor’s advertisement, will be considered an intolerable constraint by many of the corporate users.

But the important concept here is whether any of this should be considered as an illegal work and is to be prohibited by law. Most regulators adopt the regulations in governing the underlying available infrastructure of speedy broadband networks or the existing overall architecture of the network to ensure that openness or neutrality and also the end-to-end characters of the network are preserved. Also what would be the impact of such a regulation in terms of the existing economic incentives for current and upcoming future broadband operators to fully innovate and also invest in most expensive new networks. Do the rights of property of network owners come into picture here? Do high tech network operators are even having the property rights in this case. Those are also complicated with the questions that will deserve extensive exploration also before policymakers rush to adopt the supposedly simple internet neutrality regulatory guidelines. In the last, the only real question in this debate can be simply stated as who will decide. That is nothing but who will call the shots of the network owners or someone else when it always comes to questions about the use of infrastructure in the Information age. For the reasons listed below, it would be wise for the policymakers to make allow the entities that own and also operate broadband networks in the freedom to experiment with few various business models to better serve the consumers. The alternative of preemptive and prophylactic government regulation also has far too many downsides. Discrimination in this concept is something difficult to define with and also open to the very much subjective topic. Disputes over what constitutes on this discrimination will definitely lead to endless and regulatory proceedings which will open the door to a great deal of the mischief by all the companies or all the organizations that will feel that they should have greater control over how the broadband networks are well operated, either in a better-faith effort to improve the existing operation of those networks or to be frank in a more self-centered effort to game with the regulatory system to their own as an advantage. Net neutrality regulation also has the property rights Broadband Service Providers possess in the infrastructure they will also own and operate. Hence by ignoring property rights and by opening the door to the increased regulatory meddling, internet neutrality regulation threatens to the retard innovation and also investment in new broadband facilities. Instead of keeping so preoccupied with maximizing number of the consumer welfare within the confined existing systems, proponents of the net neutrality, especially the impressive list of well heeled corporate that are part of CBUI will need to put more thought and energy into idea of how the networks of the future are to be funded and constructed. The principle that CBUI members being seem to ignore is that competition in the above creation of networks is very important as competition in the goods as well as services that get sold over existing networks.

Big companies definitely gets benefited from this since there is not restrictions on the net access and usage hence they will always go for heavy use large downloads resulting in more use when compared to individuals where they also make large profits with the help of this hence they get benefited from net neutrality.

Finally, proponents of Net neutrality will also results in ignoring the fact about the network capacity usage and the profit motive which will always provide very powerful checks on overly restrictive as well as carrier activities. Carriers definitely make money always by only carrying huge traffics. Capacity utilization is one of the very important concepts in the field of networking business. A speedy broadband network without the subscribers is like a airplane with the empty seats and a recipe for financial disaster. Broadband Service Providers will not want to restrict the traffic flows or encumber Net-surfing activities for the fear of diminished capacity use as as frustrated consumers will consume less of those available networks, or leave the network altogether as free. That is why cable operators will not configure their set top boxes to middle with the consumer access to traditional television channel stations. Even though they will have the technical capability to restrict the existing stations consumers watch or even though when they want to watch them, cable operators understand that their video with customer base will grow only if they will expand the range of the viewing options, not curtail or artificially limit of them. Hence finally in attempting to attract as many as subscribers as possible, Broadband Service Providers will also need to take few steps to make sure the integrity as well as performance of the networks or to expand the range of the service offerings to attract new customers. That is why some minor restrictions on the certain types of network uses where activities will occasionally be imposed by carriers. For eg, cable companies currently provides access to the certain video channels on a pay-per-view plan basis, largely because most users don’t want, in that way so their children will not gain access to those channels. Broadband Service Providers will have to strike an dedicated balance, but the profit will motive them with a powerful incentive not to restrict activities on their networks. That is especially the case of the speedy broadband market which grows increasingly competitive hence consumers have more options from which they can choose.

Hence there should be a way to connect this to the concept of their becoming two internets, the paid and unpaid. Generally there are policies saying about the fair usage policy where the users are restricted to some limits in the unlimited plans of data usage so that if they cross the limit of that then they should pay extra from the actual rentals. This will act as paid internet where it the usage is within the limits then it is concept of free internet. This will definitely benefit the Internet service providers in limiting the user’s mainly corporate users since the restriction is made such that unlimited access is controlled.


References:


1) "Network Neutrality ". A guide to network neutrality,   2008.
2) The Delusions of Net Neutrality | Andrew Odlyzko | Voices ... (n.d.). Retrieved from --voices.allthingsd----20080904/the-delusions-of-net-neutrality/
3)      A e-book book on net neutrality, towards co regulatory solution, 2009
4) "Vint Cerf speaks out on net neutrality", Net neutrality importance By Davidson, Alan , 2005

5) "Common sense about network neutrality". Support on internet neutrality By Farber, David,   2006). 

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.

Wednesday, 26 November 2014

Networking Homework Help: Explain why security is important for WLANs, even more ...

Q)Explain why security is important for WLANs, even more so than for wired networks. 

Sol:

More security is needed and security is very much important in case of wireless LANs, when compared to wired LANs. The main reason behind this is in case of wireless LANs by making use of the wireless authentication of the authorized wireless user any one can make use of it also hacking the wireless network is very easy if it is not password protected. Since in most of the WLANs the users are not protected by a unique password, since wireless LANs are always used in case of places like college campus or office campus where multiple users can access the network. Hence in case of wired LAN there is a need for the dedicated channel or cable through which every user can get connected to the network whereas in case of wireless LANs there is no need for it, sometimes it will not even ask for any security passwords. Hence any user can get connected to the network and use it without paying for it. As a result more security is important for WLAN’s when compared to Wired LAN.

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.


Networking Homework Help: There is an ever growing range of physical media being offered such as fiber...

Q)There is an ever growing range of physical media being offered such as fiber, coax, satellite, IP over power lines, a number of wireless technologies, and more. Recently, the telephone companies announced 4G wireless communications and the IEEE has WiMax at Gigabit rates. What criteria would you use to select technologies for your business and for your home?
Sol:
The following are the criteria being used to select technologies for my business:
a) Multiple connections with maximum speed.
b) Higher bandwidth with lesser price.
c) Unlimited downloads with no additional charges.
d) Unlimited access within the coverage area irrespective of the machines being used.
e) Full time high speed networks without any congestion.

The following are the criteria being used to select technologies for my home:
a) Not more than two connections at a time.
b) Very lesser cost, irrespective of download limits.
c) Limited access but reduction in the monthly bill.
d) Moderate speed and bandwidth, irrespective of the congestion.
e) Lesser monthly rentals provided there are additional charges for download if it crosses the available limit.


General Assignment Help: How to define a portfolio of Outsourced information technologies services...

Q) How to define a portfolio of Outsourced information technologies services??

Sol: 
Portfolio of Outsourced Information Technologies services can be defined as identifying and understanding the customer requirements, also providing a way to communicate the value that the IT organization delivers to the business. The portfolio of IT services also allows the IT organization to say to the business, “Here is what we deliver to you”. Ultimately, it is the list of what customers ‘buy’ from the IT organization by paying the Organization.


Read and Answer: De-noising sea noise data....

1) De-noising sea noise data
This work presents De-noising sea noise data and also how data from a marine seismic survey, which is highly contaminated by noise, was de-noised through the use of a time-frequency filter. In addition to the present standard work flow designed to remove cavitation noise, strumming noise and swell-noise. We introduce a new approach to track seismic interference. This is done by applying time-frequency de-noising on the slowness that gathers. As a motivation and background for the processing we also explain some of the techniques behind the generation of the many different noise types.

The end story is that even in case low if there is a low quality input data then also it can be turned into high quality seismic sections. Even though the dataset used is only one, the results and its methodologies represented here are considered to be general, and should be definitely applicable to a large number of seismic surveys.


Questions:
a) Name the two components which seismic data consists of? 
b) What is the second problem in this dataset?
c) What is the frequency range of swell noise?
d) What is the frequency range of hydrostatic pressure variation noise?
Sol:
a) signal and a noise component
b) Swell-noise
c) (1-10(15)Hz)

d) (0-1(2)Hz)

Tuesday, 25 November 2014

Assignment Help: Phases of the Moon Exercise...

In this exercise, you will investigate the cause of the phases of the Moon. The figure below shows an orbital diagram of the Earth-Moon system as viewed from above the Earth's north pole. Light from the Sun is coming from the left. Note that the drawing is not to scale.

Section I

Shade in the part of the Moon that is in shadow and the part that is not observable from Earth in each of the eight numbered positions. The first has been completed as an example. (Use dark shading for the shadow, light cross-hatch for the unobservable side.) 

To be continued based on the request, please feel free to contact us or comment on this post for more info on this question/answer

Assignment Help: VLSI, Electronic Design, Transisor & Wireless Telecommunication References

A Small Assignment on wireless telecommunications & few of its references:

Wireless Telecommunications

The growth in the field of wireless technology is very wide such that most of the stuffs in the world works as wireless, such that the expectation of the public in the world started increasing and the hard work started reducing since they expect the things to be done or executed easily without much hard work.
The development in the field of wireless telecommunication resulted in the development of the business in the field of information technology. This advancement helped the world to improve the communication between different countries and different cities. This resulted in fastest transfer of information between the public.
Due to the advancement in the field of wireless telecommunication, the wired communication started becoming outdated and the market for the mobile phones and wireless service providers started improving. Also the competition for the wireless service providers resulted in reduction of call rates in the wireless telecommunications which was quite high at the starting stages.
Capture interdependence in-between traffic, transmission technology, and spectrum as well as infrastructure and service quality

Here we are talking about the traffic during the peak hours of data transmission, where it might also result in congestion. The advancement in the field of wireless telecommunications resulted in capturing the interdependence in between traffic, where the channels allocated for the wireless communication is not fixed, but it’s dynamic. Hence there is reduction of traffic in case of wireless communication when compared to wired communication. The transmission technologies are used to transmit the wireless signals using the wireless towers so that the wireless devices will be able to capture the signals within the limits defined. Initial investment for the infrastructure related to the set up of the wireless communication systems will be bit high but later on it will be very easy to maintain as well as the amount of revenue generated from it will be very high.

Incorporate congestion and also minimum infrastructure needs
But due to development in the field of information technology the ideas related to cost cutting was gathered and customized to form various models. These models resulted in delivering better and minimum infrastructure need along with small investments to set up wireless systems and also these models resulted in very cheap local and international calls which are congestion free. Hence minimum infrastructure needs resulted in lesser investments for wireless service providers and these service providers made the service available to almost all the general public by reducing the initial cost of purchase of the devices and also by keeping lesser price for calls.

Relative profits and revenue as well as return on assets and market share to the changes in demand and transmission technology

The above developed model also helped in knowing about the relative profits earned by the wireless service providers for the initial investment made. As the market share and return on assets started reflecting due to the changes in the demand for the service, which also resulted in the further research and advancement in the technology of wireless telecommunications.

Finally we can say wireless communication is the boom for the field of technology and communications.

References on wireless telecommunications:
1) Tse, David; Viswanath, Pramod (2005). Fundamentals of Wireless Communication. Cambridge University Press. ISBN 0521845270.
2) Rappaport, Theodore (2002). Wireless telecommunications: Principles and Practice. Prentice Hall. ISBN 0130422320.
3) Molisch, Andreas (2005). Wireless telecommunications. Wiley-IEEE Press. ISBN 047084888X.
4) Goldsmith, Andrea (2005). Wireless Communications. Cambridge University Press. ISBN 0521837162.
5) ^ "Wireless Communication". sintef.no. Retrieved 2008-03-16.
6) Story, Alfred Thomas (1904). A story of wireless telegraphy. New York, D. Appleton and Co..
8) "Heinrich Rudolf Hertz". chem.ch.huji.ac.il. Retrieved 2008-03-16.
9) O'Brien, J. & Marakas, G.M.(2008) Management Information Systems (pp. 239). New York, NY: McGraw-Hill Irwin
10)         J.C. Bose, Collected Physical Papers. New York, N.Y.: Longmans, Green and Co., 1927


References on VISI design and EDA
1) VLSI design, 2007
2) VLSI Series, 2008
7) Kirti Sikri Desai (2006). "EDA Innovation through Merger and Acquisitions". EDA Cafe. Retrieved March 23, 2010.
8) Combinatorial Algorithms for Integrated Circuit Layout, by Thomas Lengauer, ISBN 3-519-02110-2, Teubner Verlag, 1997.
9) Electronic Design Automation For Integrated Circuits Handbook, by Lavagno, Martin, and Scheffer, ISBN 0-8493-3096-3, 2006
10)         The Electronic Design Automation Handbook, by Dirk Jansen et al., Kluwer Academic Publishers, ISBN 1-4020-7502-2, 2003

References for Transistors, amplifiers and analogue circuits design
1) "transistor". American Heritage Dictionary (3rd ed.). Boston: Houghton Mifflin. 1992.
2) J. Chelikowski, "Introduction: Silicon in all its Forms", Silicon: evolution and future of a technology (Editors: P. Siffert, E. F. Krimmel), p.1, Springer, 2004 ISBN 3-540-40546-1.
3) Lilienfeld, Julius Edgar, "Method and apparatus for controlling electric current" U.S. Patent 1,745,175 1930-01-28 (filed in Canada 1925-10-22, in US 1926-10-08).
4) "Transistor Example". 071003 bcae1.com
5) W. Heywang, K. H. Zaininger, "Silicon: The Semiconductor Material", Silicon: evolution and future of a technology (Editors: P. Siffert, E. F. Krimmel), p.36, Springer, 2004 ISBN 3-540-40546-1.
6) Verhoeven CJM, van Staveren A, Monna GLE, Kouwenhoven MHL and Yildiz E (2003). Structured electronic design: negative feedback amplifiers. Boston/Dordrecht: Kluwer Academic. pp. 10. ISBN 1-4020-7590-1.
7) Robert S. Symons (1998). "Tubes: Still vital after all these years". IEEE Spectrum 35 (4): 52–63. doi:10.1109/6.666962.
8) Singmin, Andrew (2001). Beginning digital electronics through projects. Newnes. p. 9. ISBN 0750672696. "Signals come from transducers..."
9) Carr, Joseph J. (2000). Secrets of RF circuit design. McGraw-Hill Professional. p. 423. ISBN 0071370677. "It is common in microwave systems..."
10)         Chen, Wai-Kai (2005). The electrical engineering handbook. Academic Press. p. 101. ISBN 0121709600. "Noise from an analog (or small-signal) perspective..."

References for Linear control systems.
1) Linear Control Systems, System overview 2009
2) Linear Control Systems, the complete reference, 2008
3) Introduction to Linear Control Systems, the introduction 2008
4) Numerical Methods for linear systems, Numerical methods 2008
5) Stability of linear control systems, Stability of LCS, 2008
7) Control Systems Overview, CS overview, 2007
8) Linear Control Systems with Matlab, Matlab implementation in LC 2008
9) Time scales of Linear Control Systems, LCS time scales 2007
10)         LCS with Laboratory, LCS and laboratory, 2008

Homework Help: What is the rms speed of each helium atom...

Q)The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 ×
10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number
is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa.
What is the rms speed of each helium atom?
Answer in units of m/s.

Sol:
The average kinetic energy is given by:
KEatom = (PV)/N
Number of atoms (N)= Avogadro's number (A) * n
where N = A*n = A*(PV/RT)
N = 6.02214 x 10^23 atoms/mole * (96235 Pa * 0.01414 m^3) / (8.31451 J/K-mol * 285.15 K)
N = 3.456 x 10^23 atoms

KEatom = (96235*0.01414 /3.456 x 10^23 )J/atom

      = 3.94 X 10^-21 J/atom

KEa = (1/2) m v^2
m = (Molecular Mass (Mm) / A)
m = (0.004 kg/mole / 6.02214 x 10^23 atoms/mole)
m = 6.42 x 10^-27 kg/atom
v^2 = (2 KEa)/m
v = sqrt((2 KEa) / m)
v = sqrt((2 * 3.94 X 10^-21 J/atom) / 6.42 x 10^-27 kg/atom)
v = 1108 m/s


Monday, 24 November 2014

Homework Help: What is the average kinetic energy of each helium atom...

Q)The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 ×
10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number
is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa.
What is the average kinetic energy of each helium atom?
Answer in units of J.

Sol:
The average kinetic energy is given by:
KEatom = (PV)/N
Number of atoms (N)= Avogadro's number (A) * n
where N = A*n = A*(PV/RT)
N = 6.02214 x 10^23 atoms/mole * (96235 Pa * 0.01414 m^3) / (8.31451 J/K-mol * 285.15 K)
N = 3.456 x 10^23 atoms


KEatom = (96235*0.01414 /3.456 x 10^23 )J/atom

      = 3.94 X 10^-21 J/atom

Chemistry Homework Help: How many atoms of helium gas are required to fill a balloon to diameter..

Q)The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 ×
10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number
is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa.
How many atoms of helium gas are required to fill a balloon to diameter 30 cm at 12◦C and 0.95 atm?

Sol:

PV = nRT
n = PV/RT
Number of atoms (N)= Avogadro's number (A) * n
N = A*n = A*(PV/RT)
P = 0.95 * 101300 Pa
P = 96235 Pa
V = (4/3) pi R^3
R = 0.15 m
V = (4/3) pi (0.15 m)^3
V = 0.01414 m^3
T = 273.15 + 12
T = 285.15 K

N = 6.02214 x 10^23 atoms/mole * (96235 Pa * 0.01414 m^3) / (8.31451 J/K-mol * 285.15 K)
N = 3.456 x 10^23 atoms


Networking Assignment Help: Explain the RSA Public Key Encryption Scheme in detail...

Q)Explain the RSA Public Key Encryption Scheme in detail.In particular ,how do the encryption and decryption algorithms work? Explain also how you choose the public and private keys.Suppose a user picks n=17*5; i.e .,p=17 and q=5.How should he pick the public key and the private key (i.e., d and e)? Give the encryption and decryption algorithms.

Sol:
RSA Public Key Encryption which was invented by Cocks (GCHQ), independently, by Rivest, Shamir and Adleman (MIT). Say for example let ‘p’ and ‘q’ is the two large prime numbers.
Let N = p*q be the modulus, then Choose ‘e’ relatively prime to (p-1)*(q-1)
Find d such that e*d = 1 mod (p-1)*(q-1)
Here the Public key is given by (N, e) and the Private Key is given by ‘d’.

The encryption as well as the decryption algorithm works as follows:
To encrypt the message M compute
C = Me mod N
And to decrypt the message C compute
M = Cd mod N
Please recall that e and N are public, hence if attacker can factor N, then he can definitely use ‘e’ to easily find the value of ‘d’ since e*d = 1 mod (p-1)*(q-1)
Factoring the modulus will break the RSA, therefore it is not known that whether the factoring is the only one way to break RSA.
Suppose a user picks N=17*5; i.e., p=17 and q=5.
Hence N= 85,
(P-1)*(q-1) = 16*4=64
Choose ‘e’ such that it is relatively prime to 64. Hence e=5
Find‘d’ such that e*d = 1 mod 64, we find that d = 7 works

Public key: (N, e) = (85, 5)
Private Key: d = 7

Encryption as well as decryption algorithm works as follows:

Public key: (N, e) = (85, 5)
Private Key: d = 7
Suppose message M = 8
Cipher text C is computed as
C = Me mod N = 85 = 32768 = 17 mod 85

Decrypt C to recover the message M by
M = Cd mod N = 177 = 410,338,673
= 12,434,505 * 85 + 8 = 8 mod 85


Homework Help: What is the speed of the block when the spring has been compressed...

A block with a mass of 0.148kg is traveling at 8.4m/s on a horizontal,frictionless surface when it hits a spring with a spring constant of 722 N/m. What is the compression of the spring when the block has slowed to 3.9 m/s?What is the speed of the block when the spring has been compressed by 0.049m?

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