Temat: scalability - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Desynchronization of simulation and optimization algorithms in HPC environment
Autorzy:: Starzec, Mateusz
Starzec, Grażyna
Paciorek, Mateusz
Tematy:: scalability
desynchronization
simulations
optimization algorithms; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/1839252.pdf Link otwiera się w nowym oknie
Opis:: The need for the scalability of an algorithm is essential when one wants to utilize an HPC infrastructure in an efficient and reasonable way. In such infrastructures, synchronization affects the efficiency of the parallel algorithms. However, one can consider introducing certain means of desynchronization in order to increase the scalability. Allowing certain messages to be omitted or delayed can be easily accepted in the case of metaheuristics. Furthermore, some simulations can also follow this pattern and thereby handle bigger environments. The paper presents a short survey on the desynchronization idea, pointing out already obtained results, or sketching out future work focused on scaling the parallel and distributed computing or simulation algorithms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Selection of Wavelet Video Codec Parameters to Optimize Coding Time
Autorzy:: Popławski, A.
Tematy:: optimization
wavelet video coding
scalability; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226134.pdf Link otwiera się w nowym oknie
Opis:: In the paper, results of experimental research on wavelet video codec are presented. The author has put emphasis on the optimal selection of the coder parameters to optimize the coding time. The author has used six test sequences (Basket, City, Crew, Harbour, Ice and Soccer in 352x288, 30 fps) for the experiments. The sequences used in the research are commonly used to assess the effectiveness of video sequence compression. The measurement of the image quality is based on the PSNR. The results of optimal selection of wavelet video codec parameters due to the coding time are presented. The main goal of the paper is to show the coder parameters that provide the best values of the PSNR for a reduced coding time.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ograniczenia skalowalności systemów asynchronicznych
Scalability limitations of asynchronous systems
Autorzy:: Grabowski, F.
Strzałka, D.
Tematy:: skalowalność
system asynchroniczny
nieekstensywność
scalability
asynchronous system
nonextesitivity; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/155694.pdf Link otwiera się w nowym oknie
Opis:: Referat dotyczy ograniczeń skalowalności systemów asynchronicznych. Istotą badań był wpływ procesów o charakterze długoterminowym na degradację wydajności i czasu odpowiedzi systemu o skończonych zaso-bach. Pokazano, że generowanie procesów o charakterze długoterminowym można wyjaśnić na bazie termodynamiki nieekstensywnej.
This paper deals with scalability limitations of asynchronous systems, Fig. 1. The impact of long-term processes on system performance degradation and response time, Fig. 4, has been investigated. As starting point of analysis we assume that asynchronous system is complex system in contrast to traditional models which based on simple systems, Fig. 2. This mean that investigations concern of influence of all system components together on performance disturbances in contradiction to independent particular component in the case of classical models. The idea presented in this paper shows how complex system behavior provide a good perspective to analysis and application asynchronous system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fully spatial and SNR scalable, SPIHT-based image coding for transmission over heterogenous networks
Autorzy:: Danyali, H.
Mertins, A.
Tematy:: wavelet image coding
scalability
SPIHT
progressive transmission
multiresolution; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/307743.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a fully scalable image coding scheme based on the set partitioning in hierarchical trees (SPIHT) algorithm. The proposed algorithm, called fully scalable SPIHT (FS-SPIHT), adds the spatial scalability feature to the SPIHT algorithm. It provides this new functionality without sacrificing other important features of the original SPIHT bitstream such as: compression efficiency, full embeddedness and rate scalability. The flexible output bitstream of the FS-SPIHT encoder which consists of a set of embedded parts related to different resolutions and quality levels can be easily adapted (reordered) to given bandwidth and resolution requirements by a simple parser without decoding the bitstream. FS-SPIHT is a very good candidate for image communication over heterogenous networks which requires high degree of scalability from image coding systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Techniques to improve scalability and performance of J2EE-based applications
Autorzy:: Jarząb, M.
Kosiński, J.
Zieliński, K.
Tematy:: J2EE
EJB
performance
scalability
tuning
load balancing; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1964218.pdf Link otwiera się w nowym oknie
Opis:: This paper reports research on improvement techniques of scalability and performance of Java 2 Platform, Enterprise Edition, (JEE) based applications. The study deals with operating systems and Java Virtual Machine (JVM) tuning, the setting of Enterprise Java Beans (EJB) Application Servers' configuration parameters and clustering methods. The theoretical principles of achieving high performance and scalability of JEE Applications are considered. The experimental environment and scenarios are described. The experimental results of the considered techniques' evaluation are presented and analyzed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Scalability evaluation of Matlab routines for parallel image processing environment
Autorzy:: Saif, J. A. M.
Sumionka, P.
Tematy:: scalability
parallel image processing
Matlab
skalowalność
równoległe przetwarzanie obrazu; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1940231.pdf Link otwiera się w nowym oknie
Opis:: Image edge detection plays a crucial role in image analysis and computer vision, it is defined as the process of finding the boundaries between objects within the considered image. The recognized edges may further be used in object recognition or image matching. In this paper a Canny image edge detector is used which gives acceptable results that can be utilized in many disciplines, but this technique is time-consuming especially when a big collection of images is analyzed. For that reason, to enhance the performance of the algorithms, a parallel platform allowing speeding up the computation is used. The scalability of a multicore supercomputer node, which is exploited to run the same routines for a collection of color images (from 2100 to 42000 images) is investigated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Guidelines for the coordinated enhancement of the maritime position, navigation and time data system
Autorzy:: Engler, E.
Hoppe, M.
Ritterbusch, J.
Ehlers, T.
Becker, C.
Ehrke, K.-C.
Callsen-Bracker, H.
Tematy:: standardized PNT data products
guidelines
requirements
scalability
integrity
reliability
resilience; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135132.pdf Link otwiera się w nowym oknie
Opis:: Reliable knowledge of a ship’s position and movement in relation to other traffic participants and obstacles is a fundamental requirement for navigation and avoiding collisions and groundings. Consequently, the onboard provision of resilient position, navigation and time data (PNT) is emphasized by the International Maritime Organization’s (IMO) e-navigation strategy, solution S3 “Improved reliability, resilience and integrity of bridge equipment and navigation information” and by the assigned risk control option RCO5 “Improved reliability and resilience of onboard PNT systems”. An initial step towards resilient PNT has been realized by the maritime community with the development of the performance standards for shipborne multi-system radionavigation receiver equipment (MRR). This MRR performance standard (PS) supports the full use of data coming from current and future radionavigation systems and services. Consequently, the combined use of several global navigation satellite systems (GNSS) and the additional use of space based augmentation systems (SBAS) as well as optional terrestrial radionavigation systems (e.g. eLoran or R-Mode) will be supported to increase the performance of positioning and timing. As a second step, the development of guidelines for an onboard PNT (data processing) unit has been identified as supplementary and necessary. The starting point is the onboard use of a combination of GNSS receivers and autarkic systems (e.g. radar, gyro, echosounders with bathymetric data) for a comprehensive provision of required PNT data. Redundancy in the available data enables the application of integrity monitoring functions to evaluate the current usability of safety-critical data and components. The aim of the guidelines is the specification of data processing rules towards the resilient provision of standardized PNT data and integrity information. For this purpose, a modular architecture for an onboard PNT system is introduced and scaled to the need for data input as well as the performance of data output.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Performance analysis of multi-layered clustering network using fault tolerance multipath routing protocol (MRP-FT) in a wireless sensor network (WSN)
Autorzy:: Kaur, Gagandeep
Tematy:: scalability
fault tolerance
neural networks
Boltzmann learning
wireless sensor network; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2204100.pdf Link otwiera się w nowym oknie
Opis:: Wireless sensor networks (WSNs) are ad hoc and self-configuring networks having the possibility that any sensor node can connect or leave the network. With no central controller in WSN, wireless sensor nodes are considered responsible for data routing in the networks. The wireless sensor nodes are very small in size and have limited resources, therefore, it becomes difficult to recharge or replace the battery of the sensor nodes at far places. The present study focused on reducing the battery consumption of the sensor nodes by the deployment of the newly proposed Fault Tolerance Multipath Routing Protocol (MRP-FT) as compared with the existing Low Energy Adaptive Clustering Hierarchy (LEACH) protocol under particle swarm optimisation based fault tolerant routing (PSO-FT) technique. The proposed algorithm of MRP-FT-based on the dynamic clustering technique using Boltzmann learning of the neural network and the weights were adjusted according to the area of networks, number of nodes and rounds, the initial energy of nodes (E0), transmission energy of nodes (d
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Projekt i implementacja skalowalnej aplikacji do rozpowszechniania informacji lokalnych
Design and implementation of a scalable application for sharing local news
Autorzy:: Kozłowski, Bartłomiej
Opis:: The thesis describes in detail the solutions used during the design and implementation of HereHappens web application that enables to share local news. Due to the requirement of high scalability, the application has been placed in Google App Engine cloud environment, and adapted to use Google Datastore as a data repository. Applied system architecture helped provide its flexibility and portability. The user interface is based entirely on AJAX technology and HTML 5 specification. The dissertation also determines the prospects for further development of the application.
Praca szczegółowo opisuje rozwiązania zastosowane podczas projektowania i implementacji aplikacji webowej HereHappens, umożliwiającej rozpowszechnianie i wyszukiwanie informacji lokalnych. Ze względu na wymóg wysokiej skalowalności, aplikacja została umieszczona w środowisku chmurowym Google App Engine oraz przystosowana do korzystania z nierelacyjnego repozytorium danych Google Datastore. Zastosowana architektura systemu pozwoliła zapewnić jego elastyczność i przenośność. Interfejs użytkownika oparty został w całości na technologii AJAX oraz na standardzie HTML 5. W pracy wyznaczono również perspektywy dalszego rozwoju aplikacji.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

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Skocz do pozycji: 10.

Tytuł:: Active Damping in Series Connected Power Modules with Continuous Output Voltage
Autorzy:: Ulmer, Sabrina
Schullerus, Gernot
Sönmez, Ertugrul
Tematy:: power electronics
modularity
scalability
GaN
gallium nitride
active filter damping; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1955969.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a modular and scalable power electronics concept for motor control with continuous output voltage. In contrast to multilevel concepts, modules with continuous output voltage are connected in series. The continuous output voltage of each module is obtained by using gallium nitride (GaN) high electron motility transistor (HEMT)s as switches inside the modules with a switching frequency in the range between 500 kHz and 1 MHz. Due to this high switching frequency a LC filter is integrated into the module resulting in a continuous output voltage. A main topic of the paper is the active damping of this LC output filter for each module and the analysis of the series connection of the damping behaviour. The results are illustrated with simulations and measurements.
Dostawca treści:: Biblioteka Nauki

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