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Your search keyword '"Puschita, Emanuel"' showing total 112 results
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112 results on '"Puschita, Emanuel"'

1. Wireless Sensor Networks for Healthcare Monitoring

Author

Borz, Ioana, Palade, Tudor, Puschita, Emanuel, Dolea, Paul, Pastrav, Andra, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Vlad, Simona, editor, and Roman, Nicolae Marius, editor

Published
2022
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2. Information Dissemination Speed in Delay Tolerant Urban Vehicular Networks in a Hyperfractal Setting

Author

Popescu, Dalia, Jacquet, Philippe, Mans, Bernard, Dumitru, Robert, Pastrav, Andra, and Puschita, Emanuel

Subjects
Computer Science - Networking and Internet Architecture
Abstract

This paper studies the fundamental communication properties of urban vehicle networks by exploiting the self-similarity and hierarchical organization of modern cities. We use an innovative model called "hyperfractal" that captures the self-similarities of both the traffic and vehicle locations but avoids the extremes of regularity and randomness. We use analytical tools to derive theoretical upper and lower bounds for the information propagation speed in an urban delay tolerant network (i.e., a network that is disconnected at all time, and thus uses a store-carry-and-forward routing model). We prove that the average broadcast time behaves as $n^{1-\delta}$ times a slowly varying function, where $\delta$ depends on the precise fractal dimension. Furthermore, we show that the broadcast speedup is due in part to an interesting self-similar phenomenon, that we denote as {\em information teleportation}. This phenomenon arises as a consequence of the topology of the vehicle traffic, and triggers an acceleration of the broadcast time. We show that our model fits real cities where open traffic data sets are available. We present simulations confirming the validity of the bounds in multiple realistic settings, including scenarios with variable speed, using both QualNet and a discrete-event simulator in Matlab., Comment: KEYWORDS: DTN; Wireless Networks; Broadcast; Fractal; Vehicular Networks; Urban networks. To appear in IEEE/ACM Transactions on Networking (IEEE & ACM), accepted July 2019, 14 pages, (ISSN-1063-6692)

Published
2017

3. Voice Quality Evaluation in a Mobile Cellular Network: In Situ Mean Opinion Score Measurements.

Author

Leonte, Sorin, Pastrav, Andra, Zamfirescu, Ciprian, and Puschita, Emanuel

Abstract

This article aims to test, measure and evaluate the quality of voice calls made in a mobile cellular network. A set of drive tests were conducted, during which logs were collected using specialized measurement terminals equipped with a dedicated voice evaluation application. Three different scenarios were considered: the first scenario consisted of a series of mobile-to-mobile calls in a circuit-switched (CS) domain over the GSM network, the second scenario involved similar calls using the VoLTE service in a packet-switched (PS) domain of a 4G network, and the third scenario employed an over-the-top (OTT) media service type via the WhatsApp application in the same PS domain of the 4G network. The measurement results highlight the user experience in each scenario and compare the voice quality evaluated through the Mean Opinion Score (MOS) across the CS and PS domains. The originality of this work consists of in situ measurements performed in Bucharest, Romania, providing detailed, context-specific insights regarding the network performance that can drive local improvements and support policy and investment decisions. [ABSTRACT FROM AUTHOR]

Published
2024
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5. SDWN for End-to-End QoS Path Selection in a Wireless Network Ecosystem

Author

Semenciuc, Eugeniu, Pastrav, Andra, Palade, Tudor, Puschita, Emanuel, Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Fratu, Octavian, editor, Militaru, Nicolae, editor, and Halunga, Simona, editor

Published
2018
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39. A UWB solution for wireless intra‐spacecraft transmissions of sensor and SpaceWire data.

Author

Puschita, Emanuel, Ratiu, Ovidiu, Drobczyk, Martin, Panagiotopoulos, Nickolaos, Kirei, Botond Sándor, Vos, Stefan, Ratiu, Vlad, Gärtner, Thomas, Pastrav, Andra, and Palade, Tudor

Subjects
WIRELESS communications, DATA transmission systems, TELECOMMUNICATION systems, DATA integrity, DETECTORS, ULTRA-wideband devices, FREIGHT forwarders, SPACE vehicles
Abstract

Summary: This paper presents the design, testing, and validation of a ultra‐wideband (UWB) wireless solution to replace wired intra‐spacecraft communications with wireless communications. The system requirements are provided in the framework of the Eu:CROPIS mission and the wired intra‐spacecraft communication system is replaced with a two‐segment wireless network. As such, distinct sets of UWB gateways and nodes are prototyped to interface with the on‐board entities and properly handle the data transmission in the resulting spacecraft and payload wireless networks. To accomplish these tasks, a custom radio module integrated into the prototypes was designed to provide the appropriate UWB RF front‐end and run a custom‐built communication stack. The viability of the solution was tested in laboratory conditions. For the test scenarios, sensor data are acquired in the payload network and forwarded as SpaceWire packets over the spacecraft network. Experimental test results indicate the suitability of the proposed solution in terms of delay and data integrity for implementing intra‐spacecraft wireless communications. [ABSTRACT FROM AUTHOR]

Published
2020
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