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[{"key": "dc.contributor.advisor", "value": "Lakanen, Antti-Jussi", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Alanko, Oskari", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-05-02T05:05:40Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-05-02T05:05:40Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2022", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/80813", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Suoratoisto on keskeinen osa modernia mediamaisemaa. Suoratoistol\u00e4hetyksill\u00e4 saattaa olla massiivisiakin katsojam\u00e4\u00e4ri\u00e4, jonka vuoksi suoratoistopalveluiden tarjoaminen vaatii huomattavasti resursseja. N\u00e4it\u00e4 resurssitarpeita voidaan kuitenkin v\u00e4hent\u00e4\u00e4 hy\u00f6dynt\u00e4m\u00e4ll\u00e4 katsojien laitteiden edelleenl\u00e4hetyskapasiteettia k\u00e4ytt\u00e4m\u00e4ll\u00e4 vertaisverkkoja (engl. p2p-networks). Katsojien, eli vertaisten, resurssien hy\u00f6dynt\u00e4misess\u00e4 on kuitenkin useita haasteita, jotka saattavat est\u00e4\u00e4 tai haitata sujuvan suoratoistopalvelun tarjoamista. T\u00e4m\u00e4 tutkimus kartoittaa n\u00e4it\u00e4 p2p-suoratoiston kohtaamia haasteita katsojan palvelunlaadun n\u00e4k\u00f6kulmasta. Havaitaan, ett\u00e4 suuri osa p2p-suoratoiston kohtaamista ongelmista liittyv\u00e4t vertaisiin liittyv\u00e4\u00e4n ennalta-arvaamattomuuteen. Vertaisissa saattaa esiinty\u00e4 kehnoja verkkoyhteyksi\u00e4 tai vertaisia saattaa poistua ilman varoitusta. T\u00e4st\u00e4 johtuvat h\u00e4iri\u00f6t yleens\u00e4 esiintyv\u00e4t suoratoiston katkeiluna, l\u00e4hetyksen laadun heikkenemisen\u00e4 ja l\u00e4hetykseen liittymisen viiveen\u00e4. P2p-suoratoisto kohtaa my\u00f6s flash crowd -ilmi\u00f6n, jossa suuri m\u00e4\u00e4r\u00e4 vertaisia pyrkii liittym\u00e4\u00e4n vertaisverkkoon nopeammin kuin vertaisverkko kykenee tehokkaasti liitt\u00e4m\u00e4\u00e4n. Hallitsematon flash crowd puolestaan johtaa liittymisien ep\u00e4onnistumisiin ja pitkiin aloitusviiveisiin.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Live streaming is an important part of modern media landscape. Live streaming broadcasts can potentially have a massive amounts of concurrent viewers, because of this providing live streaming services takes considerable resources. However by using the forwarding capacity of viewers, by using peer-to-peer-networks, it is possible to lessen this resource requirement signifcantly. Using the resources of viewers, as in peers, has some challenges and difficulties that might impede the service providers ability to deliver a smooth live streaming service. This paper surveys these challenges while focusing on problems that diminish the quality of service for viewers. Large part of p2p-streaming\u2019s issues are based on unpredictability of peers. Peers might have poor internet connections or leave the p2p-network unprompted. Issues caused by these peer unpredictabilities commonly manifest as interruptions in the broadcast, as poor video quality or as increased delay in joining the broadcast. Additionally p2p-streaming faces issues with a phenomena called flash crowd, where more peers try to join the network faster than the network can accomodate them. Unmanaged flash crowd leads to elongated join times and increases the likelyhood of joining failing altogether.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2022-05-02T05:05:40Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-05-02T05:05:40Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "36", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "peer-to-peer", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "p2p", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "multicast", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "P2p-suoratoiston keskeiset saatavuuden ongelmat", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "bachelor thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202205022478", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Bachelor's thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Kandidaatinty\u00f6", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Informaatioteknologian tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Information Technology", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Informaatioteknologia", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Information Technology", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Tietotekniikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Mathematical Information Technology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_7a1f", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "bachelorThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "602", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "vertaisverkot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "suoratoisto", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "tietoliikenneverkot", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "video", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
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