Kitowski, Jacek
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informatyka techniczna i telekomunikacja
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Item type:Article, Access status: Open Access , Mobile social networks for live meetings(Wydawnictwa AGH, 2012) Wrzeszcz, Michał; Kitowski, JacekIn this article, we present an idea of combining social networking websites and modern mobile devices abilities to transfer social networking activity to a higher level. Nowadays, these devices and websites are used to offer ability of remote communication (phone calls, message exchange etc.), which potentially can be used to notify people about meetings in the real world. Since the current social network models do not provide enough information for such notification (social networking websites are examples of social networks) a new social network model that will be suitable for the above mentioned application is proposed and a new social platform that base on mobile devices is introduced. This platform can notify users when their friends are nearby. The paper presents the model and the simulation that verifies the approachItem type:Article, Access status: Open Access , Policy-based sla storagemanagement model fordistributeddata storage services(Wydawnictwa AGH, 2018) Nikolow, Darin; Słota, Renata; Polak, Stanisław; Pogoda, Marek; Kitowski, JacekThere is high demand for storage related services supporting scientists in their research activities. Those services are expected to provide not only capacity but also features allowing for more exible and cost ecient usage. Such features include easy multiplatform data access, long term data retention, support for performance and cost dierentiating of SLA restricted data access. The paper presents a policy-based SLA storage management model for distributed data storage services. The model allows for automated management of distributed data aimed at QoS provisioning with no strict resource reservation. The problem of providing users with the required QoS requirements is complex, and therefore the model implements heuristic approach for solving it. The corresponding system architecture, metrics and methods for SLA focused storage management are developed and tested in a real, nationwide environment. Keywords distributed storage systems, quality of service, service level agreement, management model, heuristics.Item type:Article, Access status: Open Access , Towards transparent data access with context awareness(Wydawnictwa AGH, 2018) Wrzeszcz, Michał; Słota, Renata; Kitowski, JacekOpen-data research is an important factor accelerating the production and analysis of scientific results as well as worldwide collaboration, still, very little data is being shared at scale. The aim of this article is to analyze existing data-access solutions along with their usage limitations. After analyzing the existing solutions and data-access stakeholder needs, the authors propose their own vision of a data-access model.Item type:Article, Access status: Open Access , The ATLAS experiment on-line monitoring and filtering as an example of real-time application(Wydawnictwa AGH, 2008) Korcyl, Krzysztof; Szymocha, Tadeusz; Funika, Włodzimierz; Kitowski, Jacek; Słota, Renata; Bałos, Kazimierz; Dutka, Łukasz; Guzy, Krzysztof; Kryza, Tomir; Pieczykolan, JanThe ATLAS detector, recording LHC particles' interactions, produces events with rate of 40 MHz and size of 1.6 MB. The processes with new and interesting physics phenomena are very rare, thus an efficient on-line filtering system (trigger) is necessary. The asynchronous part of that system relays on few thousands of computing nodes running the filtering software. Applying refined filtering criteria results in increase of processing times what may lead to lack of processing resources installed on CERN site. We propose extension to this part of the system based on submission of the real-time filtering tasks into the Grid.Item type:Article, Access status: Open Access , Agent-based monitoring using fuzzy logic and rules(Wydawnictwa AGH, 2011) Funika, Włodzimierz; Szura, Filip; Kitowski, JacekIn this paper we present two solutions ofmonitoring automation for distributed systems. We develop this system to automate monitoring of distributes systems. Both solutions are aimed to monitor data storage and web services like web page servers. The first solution implemented in a system called Saude-Net, is an rule-based top level monitoring tool. In this system there are implemented rules which provide conditions which refer to one or more measured values. This system is able to choose the best action for an observed situation, e.g. a failure. It is possible to define more than one rule which relate to the same monitoring resource. The second concept presented in this paper refers to a fuzzy logic agent based approach to network monitoring. It is called SAMM compliant Agent. It is an extension to the Semantic-based Autonomous Monitoring and Management system (SAMM). On the one hand, it uses rules to define simple actions, based on a simple condition and an action description. On the other hand the main knowledge of this solution is defined by fuzzy logic. This system is able to manage and modify its knowledge to better fit to monitored resources. The knowledge in this concept is distributed among all the agents. The agents residing on a different hosts handle their parts ofthe knowledge and are capable to share/exchange them.Item type:Article, Access status: Open Access , Computer aided distributed post-stroke rehabilitation environment(Wydawnictwa AGH, 2016) Wrzeszcz, Michał; Otfinowski, Janusz Stanisław; Słota, Renata; Kitowski, JacekIn this paper we present the results of a two-year study aimed at developing a full-fledged computer environment supporting post-stroke rehabilitation. The system was designed by a team of computer scientists, psychologists and physiotherapists. It adopts a holistic approach to rehabilitation. In order to extend the rehabilitation process, the applied methods include a remote rehabilitation stage which can be carried out of at the patient’s home. The paper presents a distributed system architecture as well as results achieved by patients prior to and following a three-month therapy based on the presented system.Item type:Article, Access status: Open Access , Resource storage management model for ensuring quality of service in the cloud archive systems(Wydawnictwa AGH, 2014) Kapanowski, Mariusz; Słota, Renata; Kitowski, JacekNowadays, service providers offer a lot of IT services in the public or private cloud. Clients can buy various kinds of services, such as SaaS, PaaS, etc. Recently, Backup as a Service (BaaS), a variety of SaaS, was introduced there. At the moment, there are several different BaaS’s available to archive data in the cloud, but they provide only a basic level of service quality. In this paper, we propose a model which ensures QoS for BaaS and some methods for management of storage resources aimed at achieving the required SLA.This model introduces a set of parameters responsible for an SLA level which can be offered at the basic or higher level of quality. The storage systems (typically HSM), which are distributed between several Data Centers, are built based on disk arrays, VTL’s, and tape libraries. The RSMM model does not assume bandwidth reservation or control, but rather is focused on management of storage resources.Item type:Article, Access status: Open Access , Management methods in SLA-aware distributed storage systems(Wydawnictwa AGH, 2012) Nikolow, Darin; Słota, Renata; Lakovic, Danilo; Winiarczyk, Paweł; Pogoda, Marek; Kitowski, JacekTraditional data storage systems provide access to user’s data on the “best effort” basis. While this paradigm is sufficient in many use cases it becomes an obstacle for applications with Quality of Service (QoS) constraints. Service Level Agreement (SLA) is a part of the contract agreed between the service provider and the client and contains a set of well defined QoS requirements regarding the provided service and the penalties applied in case of violations. In the paper we propose a set of SLA parameters and QoS metrics relevant to data storage processes and the management methods necessary for avoiding SLA violations. A key assumption in the proposed approach is that the underlying distributed storage system does not provide functionality for resource or bandwidth reservation for a given client request.Item type:Article, Access status: Open Access , A toolkit for storage QoS provisioning for data-intensive applications(Wydawnictwa AGH, 2012) Słota, Renata; Król, Dariusz; Skałkowski, Kornel; Orzechowski, Michał; Nikolow, Darin; Kryza, Bartosz; Wrzeszcz, Michał; Kitowski, JacekThis paper describes a programming toolkit developed in the PL-Grid project, named QStorMan, which supports storage QoS provisioning for data-intensive applications in distributed environments. QStorMan exploits knowledgeoriented methods for matching storage resources to non-functional requirements, which are defined for a data-intensive application. In order to support various usage scenarios, QStorMan provides two interfaces, such as programming libraries or a web portal. The interfaces allow to define the requirements either directly in an application source code or by using an intuitive graphical interface. The first way provides finer granularity, e.g., each portion of data processed by an application can define a different set of requirements. The second method is aimed at legacy applications support, which source code can not be modified. The toolkit has been evaluated using synthetic benchmarks and the production infrastructure of PL-Grid, in particular its storage infrastructure, which utilizes the Lustre file system.Item type:Article, Access status: Open Access , Benchmarking high performance architectures with natural language processing algorithms(Wydawnictwa AGH, 2011) Kuta, Marcin; Kitowski, JacekNatural Language Processing algorithms are resource demanding, especially when tuning to inflective language like Polish is needed. The paper presents time and memory requirements of part of speech tagging and clustering algorithms applied to two corpora of the Polish language. The algorithms are benchmarked on three high performance platforms of different architectures. Additionally sequential versions and OpenMP implementations of clustering algorithms were compared.