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[{"key": "dc.contributor.advisor", "value": "Kataja , Markku", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Puranen, Pietari", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-01-03T09:15:39Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-01-03T09:15:39Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/60844", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Luunmurtuman onnistunut paraneminen vaatii murtuma-alueen luiden pysymist\u00e4\npaikallaan ja oikeassa asennossa koko paranemisen ajan. T\u00e4m\u00e4n pakottamiseksi\nortopedi voi asentaa potilaan luuhun erilaisia metallisia tukirakenteita, yhden vaihtoehdoista ollessa Kischner piikeiksi tai K-piikeiksi kutsutut pitk\u00e4t ja ohuet neulat.\nLuunmurtuman parannuttua piikit tulee poistaa, mutta paranemisen aikana n\u00e4iden p\u00e4\u00e4lle muodostunut luu- ja sidekudos vaikeuttavat piikkien l\u00f6yt\u00e4mist\u00e4 ilman\ntarpeettoman kudosvaurion aiheuttamista potilaalle.\n\nT\u00e4ss\u00e4 tutkielmassa kerron erityisesti n\u00e4iden K-piikkien havaitsemiseen kehitt\u00e4m\u00e4st\u00e4ni, pienikokoisesta metallinpaljastimen prototyypist\u00e4, jonka toiminta perustuu\nanturina k\u00e4ytetyll\u00e4 solenoidilla aikaansaadun, oskilloivan magneettikent\u00e4n piikkeihin indusoimien py\u00f6rrevirtojen havaitsemiseen kyseisen solenoidin induktanssin\nmuutoksen perusteella. Anturisolenoidia k\u00e4ytettiin osana elektronisen oskillaattorin\nv\u00e4r\u00e4htelij\u00e4\u00e4, jolloin induktanssin muutos aiheutti vastaavan muutoksen oskillaattorin taajuudessa. T\u00e4t\u00e4 taajuusmuutosta havainnoitiin Beat Frequency Oscillator\n-piirill\u00e4 (BFO), joka vertaa anturin oskillaattorin taajuutta identtisen referenssioskillaattorin vakiona pysyv\u00e4\u00e4n taajuuteen, tuottaen signaalin, jonka taajuus vastaa\nn\u00e4iden erotusta. Menetelm\u00e4 mahdollistaa anturioskillaattorin pientenkin taajuusmuutosten havaitsemisen erotusoskillaattorin taajuusmuutosten ollessa t\u00e4h\u00e4n suoraan\nverrannollisia.\n\nTutkielmassa esitelty prototyyppi kehitettiin parantamaan aikaisemmin samaan tarkoitukseen valmistetun, mutta erilaisella havaintomenetelm\u00e4\u00e4n perustuvan laitteen\n\n\n\nherkkyytt\u00e4, k\u00e4ytett\u00e4vyytt\u00e4 ja h\u00e4iri\u00f6nsietoa. Prototyypin merkitt\u00e4vimm\u00e4t parannukset aiempaan n\u00e4hden olivatkin oskillaattorien komponenttien, erityisesti niiss\u00e4\nk\u00e4ytettyjen solenoidien suojaus ymp\u00e4rist\u00f6n kanssa tapahtuvan kapasitiivisen kytkeytymisen aiheuttamalta h\u00e4iri\u00f6signaalilta, sek\u00e4 signaalin havainnoimiseen k\u00e4ytettyjen\nlogaritmisten menetelmien mahdollistama herkkyyden parantaminen ja ep\u00e4lineaarisen taajuuserovasteen linearisointi. Kuitenkin nyt valmistettuun prototyyppiin j\u00e4i\nmy\u00f6s joitain parannuskohteita. N\u00e4ist\u00e4 erityisesti oskillaattorien taajuuksien l\u00e4mp\u00f6tilariipuvuuden v\u00e4hent\u00e4minen, taajuusalueen tarkempi suunnittelu kohteiden ominaisuuksien perusteella vasteen voimakkuuden maksimoimiseksi sek\u00e4 laitteiston koon\npienent\u00e4minen elektroniikan paremmalla suunnittelulla ja digitalisoinnilla j\u00e4iv\u00e4t\njatkokehityskohteiksi.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2019-01-03T09:15:39Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-01-03T09:15:39Z (GMT). No. of bitstreams: 0\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "122", "language": "", "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": "laitekehitys", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "metallinpaljastin", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "py\u00f6rrevirrat", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "solenoidi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Pienikokoisen metallinpaljastimen kehitt\u00e4minen kudoksen sis\u00e4isten kohteiden paikantamiseen", "language": "", "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-201901031020", "language": "", "element": "identifier", "qualifier": "urn", "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": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "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": "Soveltava fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Physics", "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_bdcc", "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": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4023", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "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.rights.accessrights", "value": "", "language": null, "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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