By Andrzej Białas (auth.), Wojciech Zamojski, Janusz Kacprzyk, Jacek Mazurkiewicz, Jarosław Sugier, Tomasz Walkowiak (eds.)
Dependability research is the hot method of functionality review of up to date structures which attempts to deal with new demanding situations which are introduced with their extraordinary complexity, dimension and variety. particularly in case of computers and networks such evaluate has to be in accordance with multidisciplinary method of idea, expertise, and upkeep of platforms which function in actual (and quite often unfriendly) environments. instead of “classic” reliability which focuses frequently on technical points of process functioning, dependability reviews examine the structures as multifaceted and complex amalgamations of technical, info and likewise human resources.
This monograph offers chosen new advancements in such components of dependability study as mathematical types, overview of software program, probabilistic evaluation, methodologies, instruments, and applied sciences. clever and tender computing equipment aid to unravel basic difficulties of dependability research that are because of the truth that in modern computers it's always tricky to discover a relation among procedure parts and process occasions (the relation among purposes and effects) and it's much more tricky to outline strict mathematical versions with “analytical” relationships among such phenomena.
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The situation is remarkably improved if one considers only the first result R@1; the three search engines are exceeding the average. 4 Results Relevance according to the Query Using our formula, we calculate the relevance of the first 20 returned results regarding to each of the 30 queries, and that for the three search engines. A note average for each group of 5 queries in the same topic was calculated and the obtained score was rounded to a note on 10. The overall results are summarized in Table 5.
4 Results Relevance according to the Query Using our formula, we calculate the relevance of the first 20 returned results regarding to each of the 30 queries, and that for the three search engines. A note average for each group of 5 queries in the same topic was calculated and the obtained score was rounded to a note on 10. The overall results are summarized in Table 5. Table 5 Evaluation of the results relevance according to the query Queries category Search engines Google Yahoo Bing R01 - R05 (News) 6,91 6,77 6,19 R06 - R10 (Animals) 5,25 6,13 5,87 R11 - R15 (Movies) 5,72 5,13 5,67 R16 - R20 (Health) 4,98 4,83 4,66 R21 - R25(Sports) 5,93 5,89 5,16 R26 - R30(Travel) 6,19 6,09 6,10 44 A.
Finally the set of triples has been communicated to the system for analysis and evaluation. 2 Performance of Search Engines Regarding the dead links, Table 3 shows that the rate of dead links is low, this is explained partly by the fact that some web site do not return the error code 404 ‘Page not found’ when the page no longer exists, but a normal HTML page with an ad hoc message, which cannot be interpreted as an error only by a human reader. We note also that 71% of dead links returned by Yahoo and 79% of those returned by Google are caused by the Amazon which, for unknown reasons, returned an error code during the experiment.
Dependable Computer Systems by Andrzej Białas (auth.), Wojciech Zamojski, Janusz Kacprzyk, Jacek Mazurkiewicz, Jarosław Sugier, Tomasz Walkowiak (eds.)