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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Multi-Class Classification for Predicting Customer Satisfaction : Application of machine learning methods to predict customer satisfaction at IKEA

Backerholm, Stina, Börjesjö, Malin January 2023 (has links)
Gaining a comprehensive understanding of the features that contribute to customer satisfaction after contact with IKEA’s Remote Customer Meeting Points (RCMPs) is essential for implementing effective remedial measures in the future. The aim of this project is to investigate if it is possible to find key features that influence customer satisfaction and to use these to predict customer satisfaction. The task has been approached as a multi-class classification problem, with the objective of classifying the observations into five distinct levels of customer satisfaction. The study utilized three models, Multinomial Logistic Regression, Random Forest, and Extreme Gradient Boosting, to investigate these possibilities. Based on the methods used and the available data, the results indicate that it is currently not feasible to accurately identify key features or predict customer satisfaction. / Att förstå vilka faktorer som bidrar till kundnöjdhet efter en kontakt med IKEAs RCMPs är avgörande för att kunna genomföra effektiva åtgärder i framtiden. Syftet med detta projekt är att undersöka om det är möjligt att hitta nyckelfaktorer som påverkar kundnöjdhet och använda dessa för att prediktera kundnöjdhet. Uppgiften har angripits som ett multi-klass klassificeringsproblem, med syftet att klas- sificera observationerna i fem olika nivåer av kundnöjdhet. Studien har utvärderat tre olika modeller, Multinomial Logistic Regression, Random Forest och Extreme Gradient Boosting, för att undersöka dessa möjligheter. Baserat på de använda metoderna med tillgängliga data, indikerar resultaten att det för tillfället inte är möjligt att identifiera nyckelfaktorer eller prediktera kundnöjdhet med hög noggrannhet.
2

Det norske Veritas og oljeutvinning til havs – gammel tradisjon i nytt farvann : Erfaringer med halvt nedsenkbare flytende plattformer og offshoreindustri 1968 – 1977

Jensen, Kim Rune January 2013 (has links)
Med fremveksten av oljeutvinning til havs ble det behov for nye metoder for å lete etter olje, i tillegg til å hente den opp. Mobile plattformer ble til i tiden rundt 1950 som et resultat av oljeindustriens vekst, og klasseselskapene gikk aktivt inn for å involvere seg i klassifisering av disse plattformene. Etter kort tid kom problemstillingen om hva en mobil plattform var – et skip eller noe annet? Det norske Veritas involverte seg i den begynnende olje- og gassutvinningen i Nordsjøen ganske tidlig. For selskapet var offshoreindustri et skritt vekk fra det tradisjonelle klassearbeidet. Likevel åpnet industrien flere dører for klasseselskapet, samtidig som det bød på nye utfordringer. Mobile plattformer var noe nytt, men hadde samtidig en forankring i det maritime miljøet. Det norske Veritas prøvde slik å utnytte sin egen lange erfaring fra skip, ved å overføre den til et eget regelverk og en egen klasse for mobile plattformer. Selskapet kjempet slik for å få en kontrollordning på mobile plattformer basert på samme ordning som for skip. Sjøfartsdirektoratet hadde et langt og nært samarbeid med Det norske Veritas. Med opprettelsen av Oljedirektoratet ble klasseselskapet en årsak til uenighet innad i direktoratene, og da spesielt omkring arbeidet med mobile plattformer - en uenighet som ville følge alle aktørene gjennom hele perioden. Spørsmålet om hva en mobil plattform skulle defineres som var også medvirkende. Oppgaven avslutter med rammeavtalen mellom Det norske Veritas og Oljedirektoratet i 1977.
3

An investigation into the feasibility of monitoring a call centre using an emotion recognition system

Stoop, Werner 04 June 2010 (has links)
In this dissertation a method for the classification of emotion in speech recordings made in a customer service call centre of a large business is presented. The problem addressed here is that customer service analysts at large businesses have to listen to large numbers of call centre recordings in order to discover customer service-related issues. Since recordings where the customer exhibits emotion are more likely to contain useful information for service improvement than “neutral” ones, being able to identify those recordings should save a lot of time for the customer service analyst. MTN South Africa agreed to provide assistance for this project. The system that has been developed for this project can interface with MTN’s call centre database, download recordings, classify them according to their emotional content, and provide feedback to the user. The system faces the additional challenge that it is required to classify emotion notwith- standing the fact that the caller may have one of several South African accents. It should also be able to function with recordings made at telephone quality sample rates. The project identifies several speech features that can be used to classify a speech recording according to its emotional content. The project uses these features to research the general methods by which the problem of emotion classification in speech can be approached. The project examines both a K-Nearest Neighbours Approach and an Artificial Neural Network- Based Approach to classify the emotion of the speaker. Research is also done with regard to classifying a recording according to the gender of the speaker using a neural network approach. The reason for this classification is that the gender of a speaker may be useful input into an emotional classifier. The project furthermore examines the problem of identifying smaller segments of speech in a recording. In the typical call centre conversation, a recording may start with the agent greeting the customer, the customer stating his or her problem, the agent performing an action, during which time no speech occurs, the agent reporting back to the user and the call being terminated. The approach taken by this project allows the program to isolate these different segments of speech in a recording and discard segments of the recording where no speech occurs. This project suggests and implements a practical approach to the creation of a classifier in a commercial environment through its use of a scripting language interpreter that can train a classifier in one script and use the trained classifier in another script to classify unknown recordings. The project also examines the practical issues involved in implementing an emotional clas- sifier. It addresses the downloading of recordings from the call centre, classifying the recording and presenting the results to the customer service analyst. AFRIKAANS : n Metode vir die klassifisering van emosie in spraakopnames in die oproepsentrum van ’n groot sake-onderneming word in hierdie verhandeling aangebied. Die probleem wat hierdeur aangespreek word, is dat kli¨entediens ontleders in ondernemings na groot hoeveelhede oproepsentrum opnames moet luister ten einde kli¨entediens aangeleenthede te identifiseer. Aangesien opnames waarin die kli¨ent emosie toon, heel waarskynlik nuttige inligting bevat oor diensverbetering, behoort die vermo¨e om daardie opnames te identifiseer vir die analis baie tyd te spaar. MTN Suid-Afrika het ingestem om bystand vir die projek te verleen. Die stelsel wat ontwikkel is kan opnames vanuit MTN se oproepsentrum databasis verkry, klassifiseer volgens emosionele inhoud en terugvoering aan die gebruiker verskaf. Die stelsel moet die verdere uitdaging kan oorkom om emosie te kan klassifiseer nieteenstaande die feit dat die spreker een van verskeie Suid-Afrikaanse aksente het. Dit moet ook in staat wees om opnames wat gemaak is teen telefoon gehalte tempos te analiseer. Die projek identifiseer verskeie spraak eienskappe wat gebruik kan word om ’n opname volgens emosionele inhoud te klassifiseer. Die projek gebruik hierdie eienskappe om die algemene metodes waarmee die probleem van emosie klassifisering in spraak benader kan word, na te vors. Die projek gebruik ’n K-Naaste Bure en ’n Neurale Netwerk benadering om die emosie van die spreker te klassifiseer. Navorsing is voorts gedoen met betrekking tot die klassifisering van die geslag van die spreker deur ’n neurale netwerk. Die rede vir hierdie klassifisering is dat die geslag van die spreker ’n nuttige inset vir ’n emosie klassifiseerder mag wees. Die projek ondersoek ook die probleem van identifisering van spraakgedeeltes in ’n opname. In ’n tipiese oproepsentrum gesprek mag die opname begin met die agent wat die kli¨ent groet, die kli¨ent wat sy of haar probleem stel, die agent wat ’n aksie uitvoer sonder spraak, die agent wat terugrapporteer aan die gebruiker en die oproep wat be¨eindig word. Die benadering van hierdie projek laat die program toe om hierdie verskillende gedeeltes te isoleer uit die opname en om gedeeltes waar daar geen spraak plaasvind nie, uit te sny. Die projek stel ’n praktiese benadering vir die ontwikkeling van ’n klassifiseerder in ’n kommersi¨ele omgewing voor en implementeer dit deur gebruik te maak van ’n programeer taal interpreteerder wat ’n klassifiseerder kan oplei in een program en die opgeleide klassifiseerder gebruik om ’n onbekende opname te klassifiseer met behulp van ’n ander program. Die projek ondersoek ook die praktiese aspekte van die implementering van ’n emosionele klassifiseerder. Dit spreek die aflaai van opnames uit die oproep sentrum, die klassifisering daarvan, en die aanbieding van die resultate aan die kli¨entediens analis, aan. Copyright / Dissertation (MEng)--University of Pretoria, 2010. / Electrical, Electronic and Computer Engineering / unrestricted

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