Budapest, Hungary
Budapest, Hungary

Time filter

Source Type

Kertesz A.,MTA SZTAKI | Kecskemeti G.,MTA SZTAKI | Brandic I.,Vienna University of Technology
Future Generation Computer Systems | Year: 2014

Cloud computing is a newly emerged computing infrastructure that builds on the latest achievements of diverse research areas, such as Grid computing, Service-oriented computing, business process management and virtualization. An important characteristic of Cloud-based services is the provision of non-functional guarantees in the form of Service Level Agreements (SLAs), such as guarantees on execution time or price. However, due to system malfunctions, changing workload conditions, hard- and software failures, established SLAs can be violated. In order to avoid costly SLA violations, flexible and adaptive SLA attainment strategies are needed. In this paper we present a self-manageable architecture for SLA-based service virtualization that provides a way to ease interoperable service executions in a diverse, heterogeneous, distributed and virtualized world of services. We demonstrate in this paper that the combination of negotiation, brokering and deployment using SLA-aware extensions and autonomic computing principles are required for achieving reliable and efficient service operation in distributed environments. © 2012 Elsevier B.V. All rights reserved.


Artusi A.,Cyprus Institute CaSToRC | Banterle F.,CNR Institute of Information Science and Technologies Alessandro Faedo | Chetverikov D.,MTA SZTAKI
Computer Graphics Forum | Year: 2011

The separation of reflection components is an important issue in computer graphics, computer vision and image processing. It provides useful information for the applications that need consistent object surface appearance, such as stereo reconstruction, visual recognition, tracking, objects re-illumination and dichromatic editing. In this paper we will present a brief survey of recent advances in separation of reflection components, also known as specularity (highlights) removal. Several techniques that try to tackle the problem from different points of view have been proposed so far. In this survey, we will overview these methods and we will present a critical analysis of their benefits and drawbacks. © 2011 The Authors.


Marosi A.,MTA SZTAKI | Kovacs J.,MTA SZTAKI | Kacsuk P.,MTA SZTAKI
Future Generation Computer Systems | Year: 2013

The paper completes the work started in the EU FP7 EDGI project for extending service grids with volunteer (global) and institutional (local) desktop grids. The Generic BOINC Application Client (GBAC) concept described in the paper enables the transparent and automatic forwarding of parameter sweep application (parametric) jobs from service grid VOs (Virtual Organizations) into connected desktop grids without any porting effort. GBAC that introduces virtualization for the volunteer BOINC (Berkeley Open Infrastructure for Network Computing) clients can also be considered as a first step towards establishing volunteer cloud systems since it provides solutions for several problems of creating such a volunteer cloud system. © 2012 Elsevier B.V. All rights reserved.


Farkas Z.,MTA SZTAKI
Journal of Grid Computing | Year: 2011

We can distinguish two different Grid concepts: desktop and service Grids. Both Grid concepts have their advantages and disadvantages, however these are different. For example desktop Grids are a cost-effective platform, but sometimes unreliable. On the other hand service Grids are highly reliable, but need remarkable funding. The aim of Grid interoperability is to combine the advantages of the different Grid concepts, so the integrated infrastructure offers the best of both concepts. Within the paper we define the Grid interoperability problem, and approximate to the generic architecture through a formal model. We prove formally that the resulting architecture solves the Grid interoperability problem, and is generic enough to interconnect different Grid infrastructures with minor work. We also show in the paper that the formal concept can be applied for creating a gLite to BOINC bridge, and the performance of the core bridge implementation is satisfactory. © 2011 Springer Science+Business Media B.V.


Farkas Z.,MTA SZTAKI | Kacsuk P.,MTA SZTAKI
Future Generation Computer Systems | Year: 2011

P-GRADE portal is an open-source multi-grid portal that supports creation, execution and management of traditional and parameter study workflows on gLite and GT-2 infrastructures. However, some user communities need support for other grid types, like desktop grids or the Amazon EC2 cloud, as well. In this paper we will present the internal architecture of P-GRADE Portal as well as the implementation details of grid support methods. This paper intends to give support for those communities who would like to further develop the portal or create a similar one for other workflow systems. © 2010 Elsevier B.V. All rights reserved.


Kertesz A.,MTA SZTAKI | Kacsuk P.,MTA SZTAKI
Future Generation Computer Systems | Year: 2010

Grid resource management has been a highly studied research field since Grids were born. Though well-designed, evaluated and widely used resource brokers and meta-schedulers have been developed, new capabilities are still required, while the major demand is for interoperability support. Most of the existing brokering solutions can hardly cross the borders of current middleware systems that are lacking the support of these requirements. In this paper we (i) investigate the current resource management solutions from the lowest to the highest level of the Grid middleware, (ii) examine and compare their connections by presenting an anatomy that helps users to grasp the basics of their operation and the researchers to identify common components and open issues. Then we (iii) introduce meta-brokering, which enables higher level resource management by utilizing existing Grid brokers, and provide an implementation of this solution, the Grid Meta-Broker Service, which is a new interoperable grid middleware service for interconnecting Grid islands to compose a World Wide Grid, where users and portals can transparently utilize a growing number of Grids in the future. Finally we (iv) evaluate the presented solution in a simulated Grid environment using real workloads. © 2009 Elsevier B.V. All rights reserved.


Visegradi A.,MTA SZTAKI | Kovacs J.,MTA SZTAKI | Kacsuk P.,MTA SZTAKI
Future Generation Computer Systems | Year: 2014

The paper describes the results of the EU FP7 EDGI project concerning how to extend gLite VOs with public and institutional BOINC desktop grids. Beyond simply showing the integration architecture components and services, the main emphasis is on how this integrated architecture can efficiently support parameter study applications, based on the so-called metajob concept created by the EDGI project. The paper explains in detail how to use the metajob concept by gLite users to exploit the BOINC desktop grids connected to the gLite VO, as well as how metajobs are managed internally by the 3G Bridge service. Performance measurements show that the Metajob concept indeed can significantly improve the performance of gLite VOs extended with desktop grids. Finally, the paper describes the practical ways of connecting BOINC desktop grids to gLite VOs and the accounting mechanism in these integrated grid systems.


Paniti I.,MTA SZTAKI
Proceedings for the Joint Conference of ISR 2014 - 45th International Symposium on Robotics and Robotik 2014 - 8th German Conference on Robotics, ISR/ROBOTIK 2014 | Year: 2014

This paper describes a new solution of an incremental, single-robot based sheet forming process with tool path calculation and thickness measurement approaches, for the production of sheet metal and thermoplastic components for prototypes and small series. As an alternative to conventional stamping and deep drawing processes which are based on big and costly dies and presses, the shaping system is based on robotized Incremental Sheet Forming (ISF), a new, clean and affordable process. © VDE VERLAG GMBH Berlin Offenbach.


Farkas Z.,MTA SZTAKI | Kacsuk P.,MTA SZTAKI
Future Generation Computer Systems | Year: 2012

Desktop grids as opposed to service grids are the cost-effective way to gather large amount of volunteer computing resources for solving scientific problems. It is possible to create desktop grids with the help of only one single machine, where volunteer desktops will connect to process work. MTA SZTAKI has created the hierarchical desktop grid concept, where not only single computers, but also desktop grids may join other systems increasing their performance significantly. In the paper we investigate scheduling issues of hierarchical desktop grid systems, present scheduling algorithms focusing on different properties, and compare them using HierDGSim, the Hierarchical Desktop Grid Simulator. © 2011 Elsevier B.V. All rights reserved.


Patent
Mta Sztaki | Date: 2012-10-03

The invention relates to a device for two sided incremental sheet forming comprising a sheet plate clamp frame (2) for gripping a sheet (4) around its perimeter, supports (3) for holding said clamp frame (2) on a base plate (1), an upper forming tool (5) above the sheet (4), a lower forming tool (6) below the sheet (4) and means (7) for synchronised moving said tools facing each other. According to the invention the means (7) for synchronised moving the forming tools is a mechanical movement copying device and there are means for moving the lower forming tool (6) on the surface of the base plate (1) according to axes X and Y. The means for moving the lower forming tool (6) on the surface of the base plate (1) contains at least one ball transfer unit (8), which may be provided with an electric, mechanic, pneumatic or hydraulic drive.

Loading MTA SZTAKI collaborators
Loading MTA SZTAKI collaborators