Wyniki wyszukiwania - BazTech

1

Characterising Functional Brain Connectivity as Social Network : the Transtopic Centrality Index

Menegaz Gloria, Tomazzoli Claudio, Cristani Matteo, Boscolo Galazzo Ilaria, Storti Silvia Francesca

Fundamenta Informaticae

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2020

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Vol. 172, nr 2

169--186

EN

Graph-based network modeling is becoming increasingly pervasive touching very different fields. Among these are social networks analysis and brain connectivity modeling. Though apparently very far apart, these two domains share the same questions about how the underlying network is structured and how this can be measured. This determines an a-priori unexpected convergence of the research efforts of two different communities, that is neurosciences and information technology. In this work, we put forth some basic issues emerging from the overlaps of the two domains and propose a first simple measure allowing to capture one among the features of interest: the transtopic closeness centrality. To this end, the related concepts are briefly recalled and two case studies are considered. Then, relying on social network analysis principles, the transposition to functional brain networks is proposed highlighting and discussing some of the inherent critical issues.

2

Performance Comparison of Routing Protocols in Opportunistic Networks

Prabha Chander, Kumar Rakesh

Annals of Computer Science and Information Systems

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2020

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Vol. 24

87--90

EN

In today's world doing data transfer in delay tolerant networks (DTN) environment is a challenging task. In DTN nodes are characterized to meet opportunistically to do routing and data transfer. In opportunistic environment no end-to-end path exists between destination and source. The contacts are made opportunistic while coming in contact for a short span of time. All communication is within this span only. Due to this feature the DTN's are sometimes recognized as Opportunistic Networks (ON's). The rules are not predefined here for choosing the next node as applicable in conventional schemes of routing. In this paper the performance of opportunistic routing protocols have been investigated namely PRoPHET, Spray and Wait, SimBet, Bubble Rap in terms of robustness and scalability. The concept of Ant Colony Optimization is used to find optimal routes while doing routing decision. The performance of SimBet and Bubble Rap is better with respect to throughput as they belong to social context aware category of protocols. Performance is evaluated in terms of packet dropped and overhead ratio also. The overhead ratio is better in SimBet and Bubble Rap as compared to Spray and Wait and PRoPHET. Depending on buffer size, speed, contact times these routing strategies shows variable performance. The result indicates that the social aware algorithms have the ability and capacity to exchange/carry information faster and improve the connectivity in ON's.

3

Identyfikacja i pomiar pozycji podmiotów w sieciach organizacyjnych

Barczak B., Cabała P.

Organizacja i Zarządzanie : kwartalnik naukowy

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2014

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nr 3

23--40

EN

The paper presents a method for determining the position of actors in organizational networks using network analysis methods that are called as a method of SNA (Social Network Analysis). The growing popularity of this approach does not only result from the need to use effective tools for the study of new forms of organization, but also with the wider availability of computer programs to help make tedious calculations. The first part of the article presents the main points of network analysis and the concept and measure of centrality. The second part discusses the problem of using network analysis to examine the position of actors in the selected organizational network.

PL

W artykule zaprezentowano sposób określania pozycji podmiotów w sieciach organizacyjnych, z wykorzystaniem metod analizy sieciowej, które w skrócie nazywane są jako metody SNA (Social Network Analysis). Rosnąca popularność tego podejścia wynika obecnie nie tylko z potrzeby wykorzystania efektywnych narzędzi badania nowych form organizacyjnych, lecz także z coraz szerszej dostępności programów komputerowych, ułatwiających dokonywanie żmudnych obliczeń. W pierwszej części artykułu przedstawiono główne założenia analizy sieciowej oraz pojęcie i miary centralności. Druga część przedstawia przykład wykorzystania analizy sieciowej do badania pozycji podmiotów w sieci organizacyjnej (centralności) na przykładzie wybranej sieci.

4

CARE : Creative Application to Remedy Epidemics

Kasprzyk R., Lipiński B., Wilkos K., Wilkos M., Bartosiak C.

Biuletyn Instytutu Systemów Informatycznych

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2009

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nr 3

45-52

EN

The paper focuses special attention on a project named CARE. The developers of the project is NosoiFighters team, which consists of students of the Cybernetics Faculty in Military University of Technology. The system is a very creative software solution that takes advantage of pioneering sociological theories, graph/networks theory and the last but not least most advanced technologies. It has a very practical purpose, in particular nowadays: countering infectious diseases, for instance HIV/AIDS, malaria, SARS, etc. The paper demonstrates how the system can help us to nail epidemics. CARE has enormous practical potential in regions such as Africa, where there are not enough medicines to treat all who are at risk.

5

"Serce nie sługa" - przypadek gdański

Awtuch A.

Czasopismo Techniczne. Architektura

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2008

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R. 105, z. 2-A

15-21

PL

Badanie przemieszczania się centrum miasta umożliwia syntaktyka przestrzeni i koncepcja rdzenia integracji. Przemieszczanie się centrum badano tą metodą na przykładzie Gdańska. Obszar rdzenia wyłoniony za pomocą modelu syntaktycznego odpowiada intensywności wynikającej z obecności poruszających się osób. Zjawisko transurbacji rejestruje się zazwyczaj ex post. Możliwe jest jednak modelowanie potencjalnych rozwiązań i testowanie ich wpływu na strukturę miasta z użyciem sprawdzonych metod.

EN

Space syntax and the concept of integration core enables observation of urban centre's transurbation. The shift of centre was investigated using these methods in the case of Gdańsk. Integration core in syntactic models matches the intensity of pedestrian movement. Transurbation is usually observed ex post but it is possible to model potential processes and test their influence on urban structure.