Search results for "2008"

showing 10 items of 71 documents

Analysis of the limitations of WiFi communications managed by the IEEE 802.11 protocol in data transmission in automated power distribution systems

2010

This paper presents a study on the performances of the IEEE 802.11 protocol used in a Medium Voltage networks management system, carried out using a model for the simulation of WiFi chains architectures. The results of the simulations give some practical indications for the use of the IEEE 802.11 protocol also in presence of transmissions characterized by rigid time intervals, for which this protocol is usually not suitable. Finally the whole communications system is presented.

IEEE 802.11EngineeringIEEE 802IEEE 802.11uSettore ING-INF/03 - Telecomunicazionibusiness.industryInter-Access Point ProtocolWiFiComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaIEEE 802.1QEmbedded systemIEEE 802.11g-2003DiagnosticIEEE 802.1XbusinessComputer networkIEEE 802.11sIEEE 802.11r-2008SPEEDAM 2010
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Assessing the effectiveness of IEEE 802.11e in multi-hop mobile network environments

2004

The IEEE 802.11e technology is receiving much interest due to the promising enhancements it offers to wireless local area networks in terms of QoS support. Until now, research has focused on single hop, access point based environments, which are the most common. We review the enhancements proposed in the last IEEE 802.11e draft (version 8.0). We analyze the performance of the IEEE 802.11e protocol on ad-hoc networks (multi-hop) in terms of throughput and end-to-end delay. We also measure the effectiveness for static and fully dynamic networks with a variable number of source stations. Finally, we analyze the performance of IEEE 802.11e when legacy IEEE 802.11 stations (no IEEE 802.11e suppo…

IEEE 802.11uIEEE 802IEEE 802.11w-2009business.industryComputer scienceInter-Access Point ProtocolDistributed computingComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSIEEE 802.11b-1999IEEE 802.1XbusinessIEEE 802.11sComputer networkIEEE 802.11r-2008
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QoS Support for Time-Constrained Multimedia Communications in IEEE 802.11 WLANs: A Performance Evaluation

2005

During the past few years, we have been witnessing the massive deployment of IEEE 802.11 wireless LANs. Even though the widespread deployment of such wireless LANs, many studies are still underway aiming to design and develop simple yet effective QoS mechanisms for supporting time-constrained services over such platforms. In this paper, we first overview five different QoS mechanisms recently introduced in the literature as well as the upcoming IEEE 802.11e (EDCA) standard. We then carry out a comparative performance evaluation of all the QoS mechanisms. We focus our study on the effectiveness of the various QoS mechanisms for supporting time-constrained services.

IEEE 802.11uIEEE 802IEEE 802.11w-2009business.industryInter-Access Point ProtocolComputer scienceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSWireless Multimedia ExtensionsMobile QoSIEEE 802.11e-2005businessTelecommunicationsComputer networkIEEE 802.11r-20082005 Systems Communications (ICW'05, ICHSN'05, ICMCS'05, SENET'05)
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Liberalizing Industrial Relations in Southern-Europe: Towards the End of a Coordinated and Egalitarian Model

2016

The paper focuses on the changes that occurred to the architecture of industrial relations in Southern-European countries during the last decade. In particular, the bargaining systems of Italy, France, Spain, Greece and Portugal are compared, with a particular attention to the legislative measures enacted under the influence of international institutions after the 2008 financial and sovereign debt crisis. The theoretical framework, under which the process of transformation is analysed, is the literature on comparative politics as recently reviewed by Thelen. At the same time, the work takes into account the labour law dogmatic category of "inderogability", represented by the couple law-bran…

Il presente lavoro analizza i cambiamenti nell'architettura delle relazioni industriali in Europa del Sud durante l'ultimo decennio. Al riguardo vengono comparati i sistemi di contrattazione collettiva di Italia Francia Spagna Grecia e Portogallo con particolare attenzione ai provvedimenti legislativi emanati dietro influenza delle istituzioni internazionali dopo la crisi finanziaria e del debito sovrano del 2008. Il contesto teorico di riferimento è rappresentato dalla letteratura in materia di politica comparata come di recente rivista da Thelen. Nel contempo l’analisi è svolta alla luce della categoria giuslavoristica di “norma inderogabile” costituita dal binomio legge-contratto collettivo nazionale figlio dei trente glorieuses. Tale architettura delle relazioni industriali è stata fortemente erosa dal rafforzamento della capacità derogatoria degli accordi aziendali. Pertanto attraverso l'uso di una comparazione multidisciplinare l'articolo dimostra che le nazioni oggetto di studio stanno transitando da un contesto di elevata regolazione verso una comune traiettoria “neo-liberale” vista la crescente asimmetria di potere tra lavoro e capitale in favore del secondo.Settore IUS/07 - Diritto Del Lavoro
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Radiocarbon dates, accumulation rates, δ¹³C and July temperature of profiles obtained from Selwyn and Misaw Lake, subarctic Canada

2010

The rapid warming of arctic regions during recent decades has been recorded by instrumental monitoring, but the natural climate variability in the past is still sparsely reconstructed across many areas. We have reconstructed past climate changes in subarctic west-central Canada. Stable carbon and oxygen isotope ratios (d13C, d18O) were derived from a single Sphagnum fuscum plant component; alpha-cellulose isolated from stems. Periods of warmer and cooler conditions identified in this region, described in terms of a "Mediaeval Climatic Anomaly" and "Little Ice Age" were registered in the temperature reconstruction based on the d13C record. Some conclusions could be drawn about wet/dry shifts…

International Polar Year (2007-2008) (IPY)
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Zvaigžņotā Debess: 2008, Rudens

2008

Latvijas Zinātņu akadēmija, Latvijas Universitāte

Izpletņi Marsa debesīsPasaules arheoastronomi KlaipēdāASTRONET sanāksme ParīzēEduards Gēliņš – 125Gaisa baloni un zinātneKrustvārdu mīklaSaulesaplis (halo) ar bezdelīguJēkabs Videnieks – 100Latvijas matemātikas olimpiāde – uzdevumu atrisinājumiESA pavadonis „Cluster” – Zemes atmosfēras skābekļa noplūdeLZA akadēmiķis Jānis Stradiņš – 75Starptautiskais Astronomijas gads 2009 – pasākumiLU Astronomijas institūts - 10 gadiIlga Daube – 90Milzu galaktika NGC 1275«Zvaigžņotajai Debesij» 50 gaduCitplanētas – karstie JupiteriVisuma tēma filatēlijā – vēstureDrosma Kondratjeva (Kalniņa) (1924-2008)Zvaigžņotā debess 2008. gada rudenīLU fizikas docents Arnolds Liberts (1888–1938)“Zvaigžņotās Debess” tematiskais rādītājs (2003.rudens-2008.vasara)Astronomiskais kalendārsJaunākie ieguvumi “Zvaigžņotās Debess” bibliotēkāESA komētu zonde „Rosetta” – asteroīds 2867 ŠteinsPlejādes – septiņas māsas
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Zvaigžņotā Debess: 2007/08, Ziema

2007

Latvijas Zinātnes padome, Latvijas Universitāte

Jezuītu darbība ĶīnāPārnova SN2006gyLīgatnes meteorīts – hipotēzeKrustvārdu mīklaArturs Balklavs-Grīnhofs - biogrāfijaLielā Suņa zvaigžņu blīvumsSāmu rūnu bungas – debess karteErnests GrasbergsLatviešu astronoms Staņislavs Vasiļevskis (1907-1988) – biogrāfijaLZA Astrofizikas laboratorija – 50Saturna pavadonis JapetsJauns Einšteina gredzensArnolds LibertsAstronomija un reliģijaGamma staru uzliesmojuma optiskā pēcblāzmaPiepūšamais planetārijs no NorvēģijasNEAR misijas noslēgumsLU Astronomiskais tornisZvaigžņotā debess 2007./08. gada ziemāGrimmu pasaka par zaķi un ezi – Mēness aptumsumsFizikas pasniedzējs Ilmārs EverssIvars ŠmeldsBārzdiņš JānisMarsa robots MSLAstronomiskās parādības - 2008Mars Sample Return misijaCitplanētu dažādībaEdgars MūkinsPlanētu redzamības kompleksā diagramma 2008CAP2007 konference Atēnās
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Zvaigžņotā Debess: 2008/09, Ziema

2008

Latvijas Zinātņu akadēmija, Latvijas Universitāte

Juris ŽagarsKrustvārdu mīklaNorises uz SaulesZiemeļvalstu-Baltijas vasaras skola 2008 (Lietuva Moletai)Mēness mobiļi – projekts ATHLETEKomisks fakts no NASA (radiomodemi bez garantijas)Visuma tēma filatēlijāLU fizikas profesors Fridrihs Treijs (1887-1965)VSRC sekmīgs eksperimentsBaldones observatorijas atklājums – asteroīds 2008 OS9Pasaules filosofijas kongress (22. kongress Seula)Astronomu jokiLU Astronomijas institūts - 10 gadiAleksandrs MičulisSpace Ship 2 un pasažieri kosmosāHeliobiologs Aleksandrs Čiževskis (1897-1964)Eiropas SWEETS autobuss RīgāZMP skaits un to iespējamās sadursmesESA/NASA Ulysses misija un Saules sistēmas vairogsKosmiskās difūzās plazmas spektroskopijaAntimatērijas dzinējsMarsa polārā ainavaAstronomiskās parādības - 2009Latvijas atklātā fizikas olimpiādeUNESCO un IAU Memorands par astronomisko pasaules mantojumuStarptautiskā matemātikas olimpiādeNestabilā dubultzvaigzne Kuģa Ķīļa EtaJurijs FrancmanisIndijas pilotējamo kosmisko misiju programmaJaunākie ieguvumi “Zvaigžņotās Debess” bibliotēkāPlanētu redzamības kompleksā diagramma 2009„Bēglis” B tipa milzis HD 271791Zvaigžņotā debess 2008./09. gada ziemāStarptautiskais Astronomijas gads - 2009Profesore Alla Masēviča (1918-2008)Daļējs Saules aptumsums - 2008.gada 1.augusts Saulkrasti
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Linguistica Lettica, Nr. 19

2010

Latviešu valodas terminoloģijas komisijaMūsdienu latviešu valodaJuris PlāķisSemantikaFonētikaAntroponīmikaValodu kontaktiTerminizstrādeValodniecības bibliogrāfija 2008Valodniecības bibliogrāfija 2009Angļu valodaValodas kultūraGramatikaSomu valodaHronika valodniecībasTerminoloģijaĀdolfs ErssValodniekiDialektoloģijaLeksikoloģija:HUMANITIES and RELIGION::Languages and linguistics::Other languages::Baltic languages [Research Subject Categories]Poļu valoda
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Lavoro a termine e contrattazione collettiva

2014

Nel ripercorrere l’evoluzione della disciplina del lavoro a tempo determinato, considerato come emblema della flessibilità e, al contempo, quale strumento per favorire l’incremento dell’occupazione, l’A. analizza in particolare il ruolo svolto dalla contrattazione collettiva, che talvolta è destinataria di un ampio rinvio legale, talaltra si ritrova ad operare entro ristretti limiti. Analysing the evolution and the regulation of fixed-term contract, considered as a symbol of flexibility and, at the same time, as a means to increase employment, the Author particularly examines the role played by collective bargaining, that sometimes is connected to a large legal referral, sometimes has to op…

Lavori flessibili e atipici contratto a tempo determinato flexicurity autonomia collettiva funzioni e livelli contratti collettivi di prossimità legge n. 230 del 1962 legge n. 56 del 1987 d.lgs. n. 368 del 2001 legge n. 247 del 2007 legge n. 133 del 2008 Collegato Lavoro riforma Fornero Decreto Lavoro n. 76 del 2013Flexible and atypical works fixed-term contract flexicurity collective autonomy functions and levels collective agreements of proximity law no. 230 of 1962 law no. 56 of 1987 legislative decree no. 368 of 2001 law no. 247 of 2007 law no. 133 of 2008 Collegato Lavoro Reform Fornero Decreto Lavoro no. 76 of 2013Settore IUS/07 - Diritto Del Lavoro
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