Wyniki wyszukiwania - Biblioteka Nauki

1

Bringing introspection into BlobSeer: Towards a self-adaptive distributed data management system

100%

Carpen-Amarie A. , Costan A. , Cai J. , Antoniu G. , Bougé L.

International Journal of Applied Mathematics and Computer Science

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2011

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tom 21

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nr 2

229-242

EN

Introspection is the prerequisite of autonomic behavior, the first step towards performance improvement and resource usage optimization for large-scale distributed systems. In grid environments, the task of observing the application behavior is assigned to monitoring systems. However, most of them are designed to provide general resource information and do not consider specific information for higher-level services. More precisely, in the context of data-intensive applications, a specific introspection layer is required to collect data about the usage of storage resources, data access patterns, etc. This paper discusses the requirements for an introspection layer in a data management system for large-scale distributed infrastructures. We focus on the case of BlobSeer, a large-scale distributed system for storing massive data. The paper explains why and how to enhance BlobSeer with introspective capabilities and proposes a three-layered architecture relying on the MonALISA monitoring framework. We illustrate the autonomic behavior of BlobSeer with a self-configuration component aiming to provide storage elasticity by dynamically scaling the number of data providers. Then we propose a preliminary approach for enabling self-protection for the BlobSeer system, through a malicious client detection component. The introspective architecture has been evaluated on the Grid'5000 testbed, with experiments that prove the feasibility of generating relevant information related to the state and behavior of the system.

2

Ocena wydajności wielkopowierzchniowej słonecznej instalacji grzewczej w DPS w Mieni

72%

Czekalski D. , Obstawski P.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2012

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tom z. 59, nr 2/II/I

143-148

PL

W referacie zaprezentowano przykład wielkopowierzchniowej słonecznego systemu grzewczego wdrożonego w obiekcie użyteczności publicznej. Scharakteryzowano wydajność cieplną instalacji w poszczególnych miesiącach wybranego roku pracy. Określono sprawność konwersji energii promieniowania słonecznego i oszacowano udział energii słonecznej w procesie przygotowania ciepłej wody. Oceniono także efekty ekonomiczne analizowanego wdrożenia.

EN

The paper presents the example of solar large-scale heating system put in place in public facility. The thermal efficiency of the installation in each month of chosen year was described. Conversion efficiency of solar energy was determined and solar energy share in the preparation of hot water was estimated. The study also evaluated the economic impact of implementation.

3

Bringing introspection into BlobSeer: Towards a self-adaptive distributed data management system

72%

Carpen-Amarie A. , Costan A. , Cai J. , Antoniu G. , Bougé L.

International Journal of Applied Mathematics and Computer Science

|

2011

|

tom Vol. 21, no 2

229-242

EN

Introspection is the prerequisite of autonomic behavior, the first step towards performance improvement and resource usage optimization for large-scale distributed systems. In grid environments, the task of observing the application behavior is assigned to monitoring systems. However, most of them are designed to provide general resource information and do not consider specific information for higher-level services. More precisely, in the context of data-intensive applications, a specific introspection layer is required to collect data about the usage of storage resources, data access patterns, etc. This paper discusses the requirements for an introspection layer in a data management system for large-scale distributed infrastructures. We focus on the case of BlobSeer, a large-scale distributed system for storing massive data. The paper explains why and how to enhance BlobSeer with introspective capabilities and proposes a three-layered architecture relying on the MonALISA monitoring framework. We illustrate the autonomic behavior of BlobSeer with a self-configuration component aiming to provide storage elasticity by dynamically scaling the number of data providers. Then we propose a preliminary approach for enabling self-protection for the BlobSeer system, through a malicious client detection component. The introspective architecture has been evaluated on the Grid'5000 testbed, with experiments that prove the feasibility of generating relevant information related to the state and behavior of the system.

4

Fuzzy modelling as a way of estimating the exploitation parameters

58%

Pająk M. , Kalotka J.

Problemy Eksploatacji

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2006

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tom nr 2

215-229

EN

To carry out the exploitation process in the proper way, it is necessary to know the values of the exploitation parameters for each moment of the process. It is especially important for large industrial objects. A lot of exploitation parameters are measured on-line, but some of them should be calculated. There are situations when the input information for the calculations are included in the measured data, but its form is entangled. In this paper a fuzzy modelling is proposed as a solution of the described problem. As an example, a fuzzy model of the temperature difference in a condenser of 13K215 steam turbine is considered.

PL

Do poprawnego sterowania procesem eksploatacji niezbędna jest znajomość wartości parametrów eksploatacyjnych w każdy momencie procesu. Jest to szczególnie istotne w przypadku dużych obiektów przemysłowych. Większość parametrów jest mierzona w sposób ciągły. Występują jednak parametry, które są wielkościami wyliczalnymi. Wartości parametrów wyliczalnych określane są na podstawie wielkości mierzonych. Nie zawsze jednak parametry wejściowe do obliczeń są zawarte w wartościach mierzonych w formie jawnej. W opracowaniu zaprezentowana została metoda modelowania rozmytego pozwalająca na stworzenie modelu procesu w przypadku, gdy dane wejściowe dostarczone są w postaci uwikłanej. Jako przykład zastosowania metody przedstawiony został sposób opracowania modelu rozmytego spiętrzenia temperatury w skraplaczu turbiny parowej 13K215.