Browsing Mastergradsoppgaver i informatikk by Title
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Browsing Mastergradsoppgaver i informatikk by Title
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Now showing items 17-23 of 23
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Aarbakke, Anne Staurland (Master thesis; Mastergradsoppgave, 01-May-2007)[+][-]
Abstract: Images are commonly used on a daily basis for research, information and entertainment. The introduction of digital cameras and especially the incorporation of cameras in mobile phones makes people able to snap photos almost everywhere at any time since their mobile phone is almost always brought with them. The fast evolution in hardware enables users to store large image collection without high costs. Making use of these image collections requires efficient image retrieval techniques. Traditional image retrieval techniques like text-based image retrieval and content-based image retrieval techniques have shortcomings. New techniques or combination of existing techniques must be established to provide users with adequate image retrieval functionality. This thesis describes two systems enabling users to retrieve information such as images, textual information, WAP-links or videos using SMS or MMS. One of the services, M2S is meant for tourists to retrieve information about attractions in Lofoten. M2S uses content-based image retrieval to retrieve the information requested. This service is designed and implemented in cooperation with Telenor R&I. The other system, CAIR is meant for users who want to retrieve images from an image collection using SMS. CAIR uses a context-based image retrieval to retrieve images. This system is designed, but not yet implemented. URI: http://hdl.handle.net/10037/1141 File(s) in this item: 1
thesis.pdf (2.161Mb) -
Hanssen, Øyvind (Master thesis; Mastergradsoppgave, 1994)[+][-]
Abstract: I denne hovedfagsavhandlinga undersøkes avbildningsmekanismer mellom ANSAware applikasjoner og en føderativ omgivelse. Dette gjøres innefor rammen av ODS-gruppas arbeid med samvirkende informasjonssystemer. For å få kunnskap om problemområdet og om hvordan avbildning effektivt kan utføres, utvikles et rammeverk for modellering, design og implementasjon av avbildningsmekanismer. Vi fokuserer spesielt på hvordan man i føderasjonen kan gi inntrykk av ANSAware objekter som persistente. Vi baserer oss på en persistensmodell som innebærer at vi stiller ulike krav til objekt-identitet. Vi trenger bare permanent identitet for noen få objekter. For disse er det behov for mekanismer for transparent forvaltning (aktivisering/passivisering). Vi undersøker to logiske komponenter som samarbeider om avbildning: Objekt-adapter som har ansvaret for forvaltning og objekt-identitet og språkbindinger som representerer programmeringsgrensesnitt for den aktuelle klient-omgivelse og realiserer aksess-transparens ved hjelp av stubs. Vi innfører begrepet proxy-objekt som representerer identifikasjon av objekter i objekt-adapter og presenterer en konseptuell modell for interaksjon med klient. Et gjenbrukbart objekt-orientert rammeverk er realisert. Dette representerer design og delvis implementasjon av objekt-adapter. Denne påbygges med applikasjonsspesifikk software for å bli komplett. En notasjon for definisjon av forvaltning av permanente objekter blir utviklet. Egenskaper ved språkbindinger blir undersøkt. Her gjøres et skille mellom direkte binding hvor klient er i samme prosess og binding via eksplisistt grensesnitt (kanonisk språk). Ei språkbinding til C++ er realisert, og det er skissert et rammeverk for binding til FRIL som er et funksjonelt og objektorientert språk for integrasjon og samvirke mellom ulike informasjonssystemer. Description: Dette er en hovedoppgave URI: http://hdl.handle.net/10037/1248 File(s) in this item: 1
thesis.pdf (2.110Mb) -
Grønvik, Johan (Master thesis; Mastergradsoppgave, Jun-2012)[+][-]
Abstract: The domain of sports analysis is a huge field in sports science. Several different computer systems are available for doing analysis, both expensive and less expensive. Some specialize in specific sports such as football or ice hockey, while others are sports agnostic. However, a common property of most of these systems is that they try to give in-depth and detailed analysis of the sport in question. This thesis proposes and describes a system that provides the user with the ability to annotate interesting happenings during a live sporting event, through a non-invasive mobile device interface. The device permits focus on important happenings by filtering out unnecessary detail. Our system provides corresponding video of the annotations on the same mobile device, thereby facilitating the process of giving video feedback to the involved coaches and players. We have implemented a prototype of the system that enables evaluation of this idea, and through case studies with Tromsø Idrettslag, a Norwegian Premier League football club, we show its usefulness and applicability. URI: http://hdl.handle.net/10037/4262 File(s) in this item: 1
thesis.pdf (38.28Mb) -
Aas, Svein Ove (Master thesis; Mastergradsoppgave, May-2010)[+][-]
Abstract: Existing networked filesystems are usually either client/server - allowing storage only on one node - hard to use, or both. The advanced ones also like to use their own on-disk format, complicating migration both ways. Skynet attempts to remedy this. It is a distributed filesystem with master/slave redundancy that is easy to use, relatively safe for your data and can be easily converted to/from a non-distributed filesystem. It uses an existing filesystem for file storage, takes care of its own maintenance as far as possible, and supports approximate POSIX semantics, with POSIX, eventual and session coherency modes. It favors speed over correctness, where this would rarely be noticed. Part of the project includes a cryptographically secure message-passing middleware for Haskell called Hermes, with distribution transparency and a gossip system. High-level SHA2 and AES bindings are also included. The Hermes portion of the project is complete and usable, the Skynet portion is not. Skynet and Hermes are designed for small-to-medium networks, achieving optimal performance at this size and suffering significant degradation in large networks. They are meant to be used for non-administrated applications in home networks. Skynet offers single-bit security. The network is encrypted and authenticated, but there is no further security inside the network. URI: http://hdl.handle.net/10037/2543 File(s) in this item: 2
skynet.tar.gz (413.6Kb)thesis.pdf (464.4Kb) -
Fjukstad, Bård (Master thesis; Mastergradsoppgave, 15-May-2008)[+][-]
Abstract: This dissertation studies composing a super sensor network from the combination of three functional sensor networks; A Sensor data producing network, a sensor data computing network and a sensor controlling network. The target devices are today labeled as large sensor nodes. The communication are based on an IP network using HTTP as the main protocol. Bonjour is used for service discovery, with some adjustments for technical reasons. This allows for naming and location of available services without centralized servers, and it is implementable in small devices. A super sensor network for meteorological observations is emulated using a computer cluster. The emulated measurements are accessed from stations available from observation collection systems accessible on the Internet. Images from web cameras are one kind of observation type used. The implemented system uses Python for rapid prototyping and for support for multiple operating systems. This dissertation demonstrates that the selected technology and architecture may handle some of the demands in a sensor network, and that the architecture gives new opportunities on how to handle updates and sensor network control. The implemented system also demonstrates that using standard Internet protocols can make access to services in the sensor network easy. A web browser may become the preferred user interface for controlling and accessing all parts of the sensor network, as it has for controlling printers and simple network devices. URI: http://hdl.handle.net/10037/1445 File(s) in this item: 2
source_code.tgz (7.704Mb)thesis.pdf (10.17Mb) -
Nilssen, Kai-Even (Master thesis; Mastergradsoppgave, May-2007)[+][-]
Abstract: I dag er elektronisk post en naturlig måte å kommunisere på. Dessverre er det enkelte brukergrupper som ikke kan utnytte denne teknologien. Vårt fokus er barn i alderen 4-8 år. Symbo prosjektet tar sikte på å gi disse brukerne muligheten til nettopp dette. Målet med dette prosjektet er å lage et symbolbasert språk kalt SymboL. Dette er en samling symboler som gjennom bruk gir et begrenset ordforråd, setningsoppbygning og grammatikk. SymboL skal så benyttes i en applikasjon kalt Symbo, som sender og mottar symbolbasert e-post. I utviklingen av SymboL har vi samarbeidet med barn i alderen 4-8 år. Vi har drevet med lavteknologisk prototypearbeid, for å få de data som ga oss våre kriterier til design av SymboL. Barna har bidratt med informasjon om hvordan symbolene skulle se ut, og hvordan de skulle grupperes. Etter design og implementasjon, ble SymboL testet sammen med applikasjonen Symbo. Barna var også her med og evaluerte både SymboL og Symbo. Det var helt nødvendig for oss å bruke publiserte metoder for utvikling av programvare til barn. Blant annet var bruk av videokamera for å dokumentere vårt arbeid uunnværlig. Vi gjennomførte vårt mål med å gi barna et symbolbasert E-post system der de kunne kommunisere med andre. Barna både likte og mestret denne formen for kommunikasjon. Det var liten tid til å teste SymboL språket skikkelig, men vi fikk indikasjoner om at SymboL kan forbedres. Description: Dette er en hovedoppgave URI: http://hdl.handle.net/10037/1043 File(s) in this item: 3
Symbo.zip (2.227Mb)thesis.pdf (2.234Mb)Video.wmv (95.92Mb) -
Nilsen, Arild (Master thesis; Mastergradsoppgave, Nov-2011)[+][-]
Abstract: To achieve low overhead, traditional cluster monitoring systems sample data at low frequencies and with coarse granularity. However, interactive monitoring requires frequent (up to 60 Hz) sampling of fine-grained data and visualization tools that can explore and display data in near real-time. This makes traditional cluster monitoring systems unsuited for interactive monitoring of distributed cluster applications, as they fail to capture short-duration events, making understanding the performance relationship between processes on the same or different nodes difficult. To address this issue, WallMon was developed, a tool for interactive visual exploration of performance behaviors in distributed systems. For gathering of data, WallMon is centered around an abstraction of collectors and handlers; collectors gathers data of interest, such as CPU and memory usage, and forwards it to handlers in a push-based fashion, while handlers take action upon the data. WallMon captures and visualizes data for every process on every node, as well as overall node statistics. Data is visualized using a technique inspired by the concept of information flocking. WallMon's design is based on the client-server model, and it is extensible through a module system that encapsulates functionality specific to monitoring (collectors) and visualization (handlers). A set of experiments have been carried out on a cluster of 29 nodes with 180 processes per node. Performance results show 7% (of 100) CPU usage at 64 Hz sampling rate when performing process-level monitoring with WallMon. Using WallMon's interactive visualization, we have observed interesting patterns in different parallel and distributed systems, such as unexpected ratio of user- and kernel-level execution among processes in a particular distributed system. URI: http://hdl.handle.net/10037/3991 File(s) in this item: 2
cdrom.zip (489.1Mb)thesis.pdf (26.17Mb)
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