284 research outputs found
PERFORMANCE MODELLING OF COOPERATING TASKS IN PC CLUSTERS
Although parallel processing is a promising way of increasing
the performance
cost efficiently, it is important to find the balance between the potential
speed-up benefits and overheads due to the organization and the increased
communication. Finding the optimal distribution of co-operating tasks,
minimizing overheads and maximizing execution speed are often completed based
on performance prediction.
Complexity of prediction gradually increases with the number of links
between the cooperating tasks. In this paper the efforts are focused on
building up a performance model for a category of tasks running on clusters
of workstations, where the result is expected at the same node the input was
fed in, and a strong dependence between the partial solutions must be
resolved to obtain the final result. In this domain we investigate the
possibilities of prediction and minimization of execution time in the
function of the cluster size.
To show the utility of our model, the results are demonstrated on the
common, widely used area of integer sorting. Modelling the execution time of
different sorting algorithms has a strong mathematical background, which
enables to easily build up formulas for the expected execution times helping
to determine the optimal cluster size. As a conclusion, we show the
execution times of the sorting algorithm measured on a test cluster, and
compare the predicted times and the measured results
Tudáshálózat elemzés és klaszterfejlesztés Kecskeméten
A klaszterek Ă©s a mögöttĂĽk állĂł lokális hálĂłzatok rĂ©gĂłta izgalmas vizsgálati terĂĽletei a regionális gazdaságtannak. Jelen dolgozatom fĹ‘ kĂ©rdĂ©se, hogy a tudáshálĂłzatok elemzĂ©se hogyan tud hozzájárulni a klaszterek fejlesztĂ©sĂ©hez. A klaszterek Ă©s a lokális hálĂłzatok regionális gazdaságfejlesztĂ©si jelentĹ‘sĂ©gĂ©nek áttekintĂ©se után a tudáshálĂłzatok szerepĂ©t a KecskemĂ©ti nagyvárosi telepĂĽlĂ©segyĂĽttes potenciális nyomdaipari klaszterĂ©nek elemzĂ©sĂ©n keresztĂĽl mutatom be. A gyakorlati vizsgálatom során szerzett tapasztalataimra alapozva kĂvánom megĂtĂ©lni a tudáshálĂłzatok elemzĂ©sĂ©nek klaszterfejlesztĂ©shez törtĂ©nĹ‘ hozzájárulását. A kecskemĂ©ti nyomdaipar vállalkozásai közötti ismeretáramlást, tudásátadást Elisa Giuliani mĂłdszertana alapján egy kĂ©rdĹ‘Ăves felmĂ©rĂ©s segĂtsĂ©gĂ©vel vizsgáltam meg. A hálĂłzat feltĂ©rkĂ©pezĂ©sem alapján fĹ‘bb következtetĂ©seim, hogy a tudáshálĂłzatok vizsgálata segĂt megismerni a klaszterek tĂ©rsĂ©gi beágyazottságát, a vállalkozások közötti kapcsolatok jellegĂ©t, a hálĂłzati struktĂşrát, valamint azonosĂtani a legbefolyásosabb szereplĹ‘ket. A tudáshálĂłzat feltĂ©rkĂ©pezĂ©s támogatja a klaszterek speciális fejlesztĂ©sĂ©nek elĹ‘kĂ©szĂtĂ©sĂ©t
Adalék Neményi Bertalan képzőművészeti gyűjteményéhez
The Budapest lawyer Dr. Bertalan Neményi (1892-1947) was one of the notable figures of Hungarian art collection in the interwar period. He was mainly drawn to contemporary Hungarian artists, so he had considerable numbers of works by József Rippl-Rónai, Lajos Gulácsy and Tivadar Csontváry Kosztka. The reconstruction of his collection is very difficult as the bulk disappeared at the end of WWII. In early 1944 he deposited a considerable segment of his collection in thirteen locked wooden crates in the safe of the Hungarian General Credit Bank. The safe was left intact by the siege of the city, but the corps of the Soviet army specialized for gathering art works plundered the safe. On 19 March 1945 Neményi asked help for the search after his collection. The list included 98 paintings, some 350 graphic sheets and 2000 books. Several of his treasures were not put in the bank but in homes of private persons. When Neményi died unexpectedly in 1947, the existing pieces of the collection got into the art trade. Some were also found there from the stock once deposited in the bank. Most of the bank deposits, however, went to Moscow. The paper tries the reconstruct the collection and the intellectual portrait of the collector with the help of archival sources first published here.</jats:p
Calculations of Performance Losses for Automobile Vehicles
Vehicle-energetic-models are used to analyze the performances and when a comprehensive structure is established even optimization could be done. For these kinds of models, the losses of the vehicles have to be known. These losses could significantly effect of the vehicle fuel consumption. From these losses the rolling resistance, drive elements and aerodynamic drag are discussed. This paper reviews some of the literatures that describes the calculation methods and gives us some idea about the degree of their value. Our further goals are to have an UpToDate loss coefficient dataset and calculation methods for further vehicle-energetic modelling
Brokering the core and the periphery: Creative success and collaboration networks in the film industry
In collaboration-based creative industries, such as film production, creators in the network core enjoy prestige and legitimacy that are key for creative success. However, core creators are challenged to maintain diverse access to new ideas or alternative views that often emerge from the network periphery. In this paper, we demonstrate that creators in the network core can increase the probability of their creative success by brokering peripheral collaborators to the core. The argument is tested on a dynamic collaboration network of movie creators constructed from a unique dataset of Hungarian feature films for the 1990-2009 period. We propose a new way to capture brokers' role in core/periphery networks and provide evidence that being in the core and at the same time bridging between the core and the periphery of the network significantly increases the likelihood of award winning
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