Search results for "Wardi"
showing 4 items of 24 documents
Improving IEEE 802.11 Performance in Chain Topologies through Distributed Polling and Network Coding
2009
Wireless multi-hop networks often rely on the use of IEEE 802.11 technology. Despite of the robustness of the IEEE 802.11 Distributed Coordination Function (DCF) for working in various network scenarios, it has been proven that critical inefficiencies can arise in the case of multi-hop packet forwarding. In this paper, we propose a MAC scheme, based on the virtualization of the Point Coordination Function, optimized for working on chain topologies with bidirectional traffic flows. Our scheme is based on a token-like access mechanism coupled with network coding. The basic idea is the use of multiple Point Coordinators (PCs) along the node chain, which are elected by passing special token fra…
On the Benefits of Random Linear Coding for Unicast Applications in Disruption Tolerant Networks
2006
In this paper, we investigate the benefits of using a form of network coding known as Random Linear Coding (RLC) for unicast communications in a mobile Disruption Tolerant Network (DTN) under epidemic routing. Under RLC, DTN nodes store and then forward random linear combinations of packets as they encounter other DTN nodes. We first consider the case where there is a single block of packets propagating in the network and then consider the case where blocks of K packets arrive according to a Poisson arrival process. Our performance metric of interest is the delay until the last packet in a block is delivered. We show that for the single block case, when bandwidth is constrained, applying RL…
Wykorzystanie elektronicznych giełd transportowych w działalności e-biznesowej przedsiębiorstw z branży TSL zorientowanych projektowo
2016
The article presents the essence and importance of electronic freight exchange in the functioning of enterprises in the transport-forwarding-logistics sector. The authors present the basic issues related to the e-government, the essence of e-business and ecommerce. Then characterizes the transition process in the transport-forwarding-logistics sector in the context of the functioning of the electronic market. The authors discuss the tools and resources to support electronic business processes in the form of electronic freight exchanges. They present the benefits and costs of the use of such tools in the transport-forwarding-logistics sector on the basis of studies conducted in selected ente…
Kolorismin voima : Rafael Wardin taiteen ja kuvallisen ajattelun taustatekijöitä
2010
Taidemaalari Rafael Wardi (s. 1928) tunnetaan parhaiten koloristisista maalauksistaan ja keltaisesta väristään. Hänet muistetaan myös sairauden ja vanhuuden esiin nostamisesta 1990-luvun lopulla sekä muotokuvaperinteen rikkomisesta presidentti Tarja Halosen muotokuvalla vuonna 2002. Selvitän pro gradussani Rafael Wardin taiteellisia lähtökohtia ja henkistä taustaa sekä tarkastelen hänen taiteensa kehitykseen vaikuttaneita asioita. Asetan Wardin hänen oman aikansa historialliseen ja kulttuuriseen kontekstiin. Tutkin hänen kotitaustaansa, opiskeluaikaansa matkoineen sekä 1940-50 -lukujen modernismin merkitystä Wardin taiteelle. Kartoitan myös juutalaisen kulttuurin perinnön vaikutusta hänen t…