| fullrecord |
[{"key": "dc.contributor.author", "value": "\u00c4rje, Johanna", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2010-06-10T09:13:19Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2010-06-10T09:13:19Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2010", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1131080", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/24379", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Pohjael\u00e4imi\u00e4 k\u00e4ytet\u00e4\u00e4n biologisessa seurannassa, jolla tutkitaan ihmistoiminnan\nvaikutuksia vesist\u00f6jen ymp\u00e4rist\u00f6n tilaan. Perinteisesti pohjael\u00e4imet tunnistetaan manuaalisesti. T\u00e4ss\u00e4 ty\u00f6ss\u00e4 tarkastellaan, miten pohjael\u00e4imi\u00e4 tunnistetaan koneellisesti k\u00e4ytt\u00e4en luokittelumenetelmi\u00e4, jotka ovat tuottaneet hyvi\u00e4 tuloksia planktoneilla. Pohjael\u00e4inten tapauksessa on t\u00e4rke\u00e4\u00e4 saavuttaa mahdollisimman tarkat estimaatit lajien suhteellisille osuuksille. T\u00e4t\u00e4 varten tarkastellaan sekaannusmatriisikorjauksena tunnettua menetelm\u00e4\u00e4 lajiosuuksien estimaateille.\n\nPohjael\u00e4imet ovat vesist\u00f6jen pohjassa el\u00e4vi\u00e4 selk\u00e4rangattomia el\u00e4imi\u00e4, jotka reagoivat nopeasti ymp\u00e4rist\u00f6n muutoksiin. Niiden runsaussuhteiden muutokset kertovat ymp\u00e4rist\u00f6n tilan muutoksista. Biologinen seuranta on biologisten laatutekij\u00f6iden, kuten pohjael\u00e4inten, havainnointia. Biologisessa seurannassa pohjael\u00e4inten havaituista lukum\u00e4\u00e4rist\u00e4 lasketaan useita indeksej\u00e4, joita k\u00e4ytet\u00e4\u00e4n vesist\u00f6jen vertailussa.\n\nKoneellisessa tunnistamisessa tutkittavat kohteet kuvataan tietokoneelle, ja kuvasta segmentoidaan, eli erotellaan, jokainen hahmo muista yksil\u00f6ist\u00e4 ja taustasta. Yksil\u00f6kuvista m\u00e4\u00e4ritet\u00e4\u00e4n yksil\u00f6n ominaisuuksia kuvaavia piirteit\u00e4, joiden avulla hahmot luokitellaan. T\u00e4ss\u00e4 ty\u00f6ss\u00e4 keskityt\u00e4\u00e4n luokittelumenetelmiin.\n\nAineistoon sovellettavat luokittelumenetelm\u00e4t ovat Bayes-luokittelija, p\u00e4\u00e4t\u00f6spuu\nja satunnainen mets\u00e4. Lis\u00e4ksi tarkastellaan v\u00e4hemm\u00e4n k\u00e4ytetty\u00e4 satunnaisen mets\u00e4n sovellusta Bayes-luokittelijaan. T\u00e4m\u00e4n odotetaan parantavan perinteisen Bayes-luokittelijan robustisuutta ja tarkkuutta.\n\nLuokkakohtaiset luokitteluvirheet aiheuttavat harhaa luokittelun tuloksena saataviin lajiosuuksien estimaatteihin. T\u00e4m\u00e4n vuoksi ty\u00f6ss\u00e4 sovelletaan sekaannusmatriisikorjauksena tunnettua menetelm\u00e4\u00e4 n\u00e4iden estimaattien korjaamiseksi.\n\nTutkielmassa kaikilla luokittelumenetelmill\u00e4 saavutetaan eritt\u00e4in hyvi\u00e4 tuloksia.\nBayes-luokittelijan luokitteluvirhe on pienin ja sill\u00e4 saavutettuja tuloksia esitell\u00e4\u00e4n my\u00f6s k\u00e4sikirjoituksessa [10]. \n\nErityisesti lajiosuuksien korjaus tuottaa kiinnostavia tuloksia. Bayes-luokittelija toimii jo itsess\u00e4\u00e4n hyvin, mutta kaikilla muilla luokittelijoilla sekaannusmatriisikorjauksella saadaan luokittelun tuloksia paremmat estimaatit lajien suhteellisille osuuksille. Etenkin satunnaisen Bayes-mets\u00e4n korjatuilla estimaateilla saavutetaan kilpailukykyisi\u00e4 tuloksia Bayes-luokittelijan luokittelun tuloksena saatujen lajiosuuksien estimaattien kanssa.", "language": "", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Johanna \u00c4rje (anjomart) on 2010-06-10 09:13:14.657714. Form: Pro gradu -lomake (1 tekij\u00e4) (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake-1-tekijae). JyX data:", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija@noreply.fi) on 2010-06-10T09:13:19Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201006102027.pdf: 870923 bytes, checksum: a235bfe8521d31efc6185449054ccc87 (MD5)\nlicense.html: 5030 bytes, checksum: 162118017c86089aabc2b46ff9961862 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2010-06-10T09:13:19Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201006102027.pdf: 870923 bytes, checksum: a235bfe8521d31efc6185449054ccc87 (MD5)\nlicense.html: 5030 bytes, checksum: 162118017c86089aabc2b46ff9961862 (MD5)\n Previous issue date: 2010", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "69 sivua", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "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": "Bayes luokittelija", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Tilastollisia luokittelumenetelmi\u00e4 koneelliseen tunnistamiseen : sovellus pohjael\u00e4inaineistoon", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201006102027", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.dcmitype", "value": "Text", "language": "en", "element": "type", "qualifier": "dcmitype", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Matematiikan ja tilastotieteen laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Mathematics and Statistics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Tilastotiede", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Statistics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": "fi", "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4043", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bayesilainen menetelm\u00e4", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "pohjael\u00e4imist\u00f6", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "tunnistaminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "luokitus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
|