Source normalized impact per paper snip: 2.075 ℹ source normalized impact per paper snip: 2014: 2.075 snip measures contextual citation impact by weighting citations based on the total number of citations in a subject field. Scimago journal rank sjr: 1.287 ℹ scimago journal rank sjr: 2014: 1.287 sjr is a prestige metric based on the idea that not all citations are the same. Sjr uses a similar algorithm as the google page rank it provides a quantitative and a qualitative measure of the journal’s impact. Impact factor: 1.256 ℹ impact factor: 2014: 1.256 the impact factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. © thomson reuters journal citation reports 2015 5 year impact factor: 1.714 ℹ five year impact factor: 2014: 1.714 to calculate the five year impact factor, citations are counted in 2014 to the previous five years and divided by the source items published in the previous five years. © journal citation reports 2015, published by thomson reuters computer networks ongoing development of computer network technology requires new communication protocols on all layers of the protocol stack to adapt to and to exploit technology specifics.

The performance of new protocol implementations has to be evaluated before deployment. Computer network emulation enables the execution of real unmodified protocol implementations within a configurable synthetic environment. Since network properties are reproduced synthetically, emulation supports reproducible measurement results for wired and wireless networks.

Meaningful evaluation scenarios typically involve a large number of communicating nodes. Reproducing the network properties of the medium access control layer can be accomplished efficiently on cheap common off the shelf computers and allows to evaluate network protocols, transport protocols, and applications. However, meaningful emulation scenario sizes often require more nodes than affordable computers.

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To scale the number of nodes in an emulation scenario beyond the available computers, we discuss approaches to virtualization and operating system partitioning. Focusing on the latter, we argue for virtual protocol stacks, which provide an extremely lightweight node virtualization enabling the execution of multiple instances of software to be evaluated on each physical computer. To connect virtual nodes on the same and on different computers, we design and implement a highly efficient software communication switch. A centralized emulation control component distributes dynamic network property updates which result from node mobility for instance. To handle the large number of nodes and thus increased updates, we propose a hierarchical control where the central component delegates updates to sub components distributed over the computers of an emulation system. Extensive evaluations show the scalability of our virtualized network emulation system.

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Hosting too many virtual nodes on the same computer may lead to resource contention. Discussing different approaches to handle resource contention, we argue for detection and recovery. In order to observe those quality criteria during emulation experiments, we propose a highly lightweight monitoring approach.

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Our monitoring is based on instrumenting an operating system kernel and observing basic resource scheduling events. Thorough evaluations demonstrate the effectiveness of quality criteria and monitoring as well as the negligible overhead of our monitoring approach. Campus network a campus network is a computer network made up of an interconnection of local area networks lans within a limited geographical area. The networking equipments switches, routers and transmission media optical fiber, copper plant, cat5 cabling etc are almost entirely owned by the campus tenant / owner: an enterprise, university, government etc. In the case of a university campus based campus network, the network is likely to link a variety of campus buildings including academic departments, the university library and student residence halls. Introduction a computer network allows sharing of resources and information among devices connected to the network.

The advanced research projects agency arpa funded the design of the advanced research projects agency network arpanet for the united states department of defence. Development of the network began in 1969, based on designs developed during the 1960s. Using a network, people can communicate efficiently and easily via e mail, instant messaging, chat rooms, telephony, video telephone calls, and videoconferencing. In a networked environment, each computer on a network can access and use hardware on the network. Suppose several personal computers on a network each require the use of a laser printer. If the personal computers and a laser printer are connected to a network, each user can then access the laser printer on the network, as they need it.

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Source normalized impact per paper snip: 2.075 ℹ source normalized impact per paper snip: 2014: 2.075 snip measures contextual citation impact by weighting citations based on the total number of citations in a subject field. © journal citation reports 2015, published by thomson reuters seven steps on the road to success by prof. Ahmed helmy department of electrical engineering university of southern california this is a short note on how to start defining your topic of interest and zooming in on specific research problems and challenges. Students interested in computer networks related topics for their directed research dr , m.s. In electrical engineering or computer science disciplines: note: this is only a starting point. There's a lot more to research than what's here!

Do not pick 'wireless networks' too general , but perhaps 'systematic testing of wireless mac layer' or 'efficient handoff for ip mobility', for instance.

compile a set of 'keywords' to start searching for high quality readings for each of the previously selected topics. Good places to start your search are ie library on line and acm library on line both of which are freely available to usc students. Google but please double check the publication details for quality there are a lot of papers out there!. Out of the search hits, select around 15 20 papers that you think are most related to what you had in mind and are of the highest quality. Do not read all these papers yet! check the title, abstract, names of authors, their affiliations, and most importantly the conference or journal. Examples of well known conferences/journals include, but are not limited to: in the general area of computer networks: ie/acm transactions on networking ton , ie journal on selected areas in communications jsac , acm sigcomm, ie infocom, ie icnp, ie sigmetrics, computer networks journal elsevier , ie icc, ie globecom, acm ccr, among others.

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In the more specific areas of wireless networks including mobile ad hoc networks, sensor networks and cellular like infrastructure based networks: acm mobicom, acm mobihoc, acm monet journal, adhoc networks journal elsevier , acm wireless networks winet journal, acm sensys, ie/acm ipsn, ie wcnc, acm mc2r, to name a few. Note: try to refine your set of keywords and perform multiple searches to cover most related quality work. If you like a specific paper look at the list of references, this will give you a good direction to follow. For the selected 15 20 papers read only the abstract, introduction and conclusion in detail you may skim the rest of the paper for a general idea. Identify the emphasis of each paper: i which problem it addresses, ii what solution it proposes, i how the solution differs from previous solutions, and iv what are the main contributions and conclusions. Out of these 15 20 papers, and based on your reading and understanding, pick a list of 4 6 papers that you think are the highest quality and that address your research interests and the challenges in the field most appropriately. Read those 4 6 papers from beginning to end, identifying in detail: i the main approaches, ii methods of analysis: a metrics, b evaluation tools, and c analysis and interpretation of resulting simulation or measured data, and i conclusions.

At the same time, try to keep a list of what you think the authors may have missed in the paper/study, gaps or limitations that could be improved upon and any ideas on how to accomplish these improvements. Some questions to ask include: did all/some papers use similar approaches? have they used the same evaluation criteria, or method of analysis? if not, then what are the strengths/weaknesses of each method? also, keep a list of ideas that you want to explore further, or background material you want to brush upon. Write a two page proposal defining, as clearly as possible, the following items: motivation research challenges overview of existing work limitations of existing work potential directions and ideas for improvement expected results and impact on the field. Have some knowlegeable trustworthy friends review the proposal for you and give feedback mainly on presentation and clarity, leave technical remarks for the reserach advisor. For example, have them read the 2 pages and tell you in their own words what they think you are proposing. If/when you think it is clear, then discuss the proposal with your research advisor. If you think you have missed some other work, then go back to the 15 20 list and pick another 3 5 good papers to read in detail, and re write parts of your proposal.

It is hard, and there are a lot of good ideas out there, and the more your read, the more you want to read which is good , but you have to focus and write those 2 pages. Remember that having a strategy is sometimes more important than dispersed ideas. It is more important to focus at this point and not get confused, so be very selective in your readings.