responsibility of data link layer pdf

... method, attempting to reduce the value χ 2 of a fit between a set of data points x[1 ndata] , y[1 ndata] with individual standard deviations sig[1 ndata] , and a nonlinear function dependent on ma coefficients a[1 ... and alamda de- creases by a factor of 10. If a step fails alamda grows by a factor of 10. You must call this 684 Chapter 15. Modeling of Data Sample page from NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC COMPUTING ... even when they must be offered without proof. Figure 15.6.1 shows the conceptual scheme of an experiment that “measures” a set of parameters. There is some underlying true set of parameters a true that...

Ngày tải lên: 15/12/2013, 04:15

... www.bkacad.com Overview Upon completion of this chapter, you will be able to: • Explain the role of Data Link layer protocols in data transmission. • Describe how the Data Link layer prepares data for transmission ... www.bkacad.com Connecting Upper Layer Services to the Media 11 • To support a wide variety of network functions, the Data Link layer is often divided into two sublayers: an upper sublayer and an lower sublayer. – ... Data Link Layer Protocols- The Frame 31 • Remember that although there are many different Data Link layer protocols that describe Data Link layer frames, each frame...

Ngày tải lên: 22/12/2013, 13:17

... serves as both ACK 2 and ACK 3. 11.2 11-1 FRAMING 11-1 FRAMING The data link layer needs to pack bits into The data link layer needs to pack bits into frames frames , so , so that each frame ... postal system practices a type of framing. The simple postal system practices a type of framing. The simple act of inserting a letter into an envelope separates one act of inserting a letter into ... of protocols discussed in this chapter 11.21 Algorithm 11.3 Sender-site algorithm for Stop-and-Wait Protocol 11.10 Flow control refers to a set of procedures used to restrict the amount of data that...

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Ngày tải lên: 05/07/2014, 06:20

... Overview of Data Modeling and Database Design 8 Overview of Data Modeling and Database Design 8Ć5 Overview When you create a database, you need to carefully consider ... design. Database Design Database design is just one of the stages of the development cycle. Through good database design, you can achieve a reliable, high-performance system. Challenges to Managing Data There ... naming rules, and guidelines. 1 2 Overview of Data Modeling and Database Design 8Ć11 Data Model Models are a cornerstone of design. Engineers build a model of a car before putting it into production...

Ngày tải lên: 21/12/2013, 06:17

... fraction of the entire data center cost, decisions for the so-called physical layer are often taken lightly. But the fact remains that 70% of all network downtime is attributed to the physical layer, ... percentage of terminations as copper, fiber optic cabling and connectivity is a significant part of the data center. Fiber links are also the most critical links because they carry data to and ... outside world, huge streams of data are transferred to and from equipment areas at extremely high data rates. The infrastructure must consistently support the flow of data without errors that...

Ngày tải lên: 16/01/2014, 21:20

... module end of a permanent link, are supported by Fluke Networks and by Krone Australia as acceptable adaptors for testing of permanent links to Class D performance. But with the release of the ... Field Performance Testing V10 050111 Page 2 of 9 Performance Testing of Permanent Links and Channels Testing of telecommunications Permanent Links and Channels to determine performance ... ability to test Class E Permanent Links between the two units is the same, provided they have the latest software version loaded. The testing of Class E permanent links and channels necessitates...

Ngày tải lên: 24/01/2014, 03:20

... onefootinfront of the other.  www.it-ebooks.info Chapter2.VariationsinDashboardUsesand Data Dashboardscanbeusedtomonitormanytypes of data andtosupportalmostanyset of objectivesbusiness deemsimportant.Therearemanywaystocategorizedashbo ... Percentage of thisyear'sbudgetsofar Apriorprediction of themeasure Forecast of whereweexpectedtobetoday Relationshiptoafutureprediction of themeasure Percentage of thisquarter'sforecast Somemeasure of thenormforthismeasure ... were onceagainabletogrow. Whatreallycausedheadstoturninrecognition of dashboardsasmuchmorethanyoureverydayfledgling technology,however,wastheEnronscandalin2001.Theaftermathputnewpressureoncorporationsto demonstratetheirabilitytocloselymonitorwhatwasgoingonintheir midstandtotherebyassure shareholdersthattheywereincontrol.Thisincreasedaccountability,combinedwiththeconcurrent economicdownturn,sentChiefInformationOfficers(CIOs)onamissiontofindanythingthatcouldhelp managersatalllevelsmoreeasilyandefficientlykeepaneyeonperformance.MostBIvendorsthat hadn't alreadystartedofferingadashboardproductsoonbegantodoso,sometimesbycleverlychangingthe name of anexistingproduct,sometimesbyquicklypurchasingtherightstoanexistingproductfroma smallervendor,andsometimesbycobblingtogetherpieces of productsthatalreadyexisted.The marketplacesoon offeredavastarray of dashboardsoftwarefromwhichtochoose. 1.3.DispellingtheConfusion Likemanyproductsthathitthehigh‐techscenewithasplash,dashboardsareveiledinmarketinghype. VirtuallyeveryvendorintheBIspaceclaimstoselldashboardsoftware,butfewclarifywhatdashboards actuallyare.I'mreminded of theearlyyears of data warehousing,wheneagertolearnaboutthis new approachto data managementIaskedmyIBMaccountmanagerhowIBMdefinedtheterm.Hisresponse wasclassicandrefreshinglycandid:"By data warehousingweatIBMmeanwhateverthecustomerthinksit means."Irealizethatthiswasn'tIBM'sofficialdefinition,whichI'msureexistedsomewhereintheir literature,butitwasmyblue‐suitedfriend'sway of sayingthatasasalesperson,itwasusefultoleavethe termvagueandflexible.Aslongasaproductorserviceremainsundefinedorlooselydefined,itiseasyto claimthatyourcompanysellsit. Thoseraresoftwarevendors thathavetakenthetimetodefinethetermintheirmarketingliteraturestart withthespecificfeatures of theirproductsasthecore of thedefinition,ratherthanagenericdescription. Asaresult,vendordefinitionstendtobeself‐validatinglists of technologiesandfeatures.Forexample,Dr. GregoryL.Hovis,Director of ProductDeploymentforSnippetsSoftware,Inc.,asserts: www.it-ebooks.info  Categorizingdashboards Commonthreadsindashboard data  Non‐quantitativedashboard data Dashboardsareusedtosupportabroadspectrum of informationneeds,spanningtheentirerange of businesseffortsthatmightben...

Ngày tải lên: 06/03/2014, 17:20

... effectiveness of retrieval tasks across a set of 11 different data visualization techniques. The data visualizations represent an identical hierarchical dataset, which has been normalized in terms of ... purpose of this research was to increase the awareness of the positive role and purpose of aesthetic in the design of data visualization techniques. This paper focused on the effect in which data ... the assessment of data visualization. Drawing analogy from the linear task of an online shopping cart with an information retrieval function within data visualization, the core of the efficiency...

Ngày tải lên: 07/03/2014, 17:20

... 19.0 Statements (data addition) 5.0 Considering the wide range of R k'r- syntax [7], the pau- city of complex sentences is surprising. The use of definitions which often involved complex ... argued as force- fully on the basis of my study of users* evaluation of machine translation [2] a study which was prompted by the evaluations of the quality of machine translation as viewed ... acceptance of the limitations of our NL interfaces. Also, we are far more aware of the fact chac evaluations of '~orth" or "quality" have Co be conducted in the con- texts of...

Ngày tải lên: 17/03/2014, 19:20

... even a majority of instances of a particular cancer. Rather, we expect that a number of exposures and characteristics of children each contribute to a proportion of instances of a particular cancer. No ... medically oriented non-profit organizations, local city or state Health Departments or Universities for collection of these data. Contracts for collecting this data are with the entire states of Connecticut, ... slope of the line in the above equation is equal to zero. The latter hypothesis is tested using the t distribution of m/SE m with the number of degrees of freedom equal to the number of calendar...

Ngày tải lên: 29/03/2014, 01:20

... quality The number of completed items, the percent of missing data in every item and the frequency distribution of indi- vidual items were determined. Ordering of levels of health The ordering of item means ... Chaithiraphan S: Reliability of Thai version of SF-36 questionnaire for the eval- uation of quality of life in cardiac patients. Journal of the Medical Association of Thailand 2000, 83:S130-136. 2. ... were females. Data quality The percent of missing item-level data was low – 32 of the 36 items showed less than 1% missing (Table 1). All of the response choices were used. The percent of respondents with...

Ngày tải lên: 18/06/2014, 19:20

... composed of TiO 2 , ZnO, and Ag 2 S. Optical and photoelectrochemistry properties of Ag 2 S QD-sensitized TNT electrodes in the presence of ZnO layers Figure 4 shows optical absorption of annealed ... electrode without the ZnO layers, the conversion efficiency of the electrode with the ZnO layers increases significantly due to the formation of efficient recombination layer between the TiO 2 nanotube ... 6:462 http://www.nanoscalereslett.com/content/6/1/462 Page 7 of 9 report on the synthesis of Ag 2 S QD- sensitized TNT phot oelectrode co mbining the excellent charge transport property of the TNTs and absorption property of Ag 2 S. Besides,...

Ngày tải lên: 21/06/2014, 01:20