Dissertations / Theses on the topic 'Mobile phone'

Nowadays, GPS Mobile has already become important part of our life. GPS is widely used for citizen and military. For military, they could use GPS to navigate the missile or space flight. For citizen, people use GPS, especially GPS Mobile, to navigate car. GPS also helps people to find their way to home. GPS are widely use on, police, company manage system, agriculture and so on. GPS Mobile is the most familiar device for all of us to use. To combine use GPS Mobile and Google Map, people can get their currently location and shortcut to their destination. Also, we can get information from the Google map, like shopping place, bus station and so on. The main purpose of our project is to help people reach this aim. By using our software, you can find your location on the Google map. When you travel abroad, you can have your own language map on the GPS mobile, easily and quickly. That’s really convenience. The most wonderful part, you can play game with your friend by using our software. What you need to do, it is just send a message to anyone you care about and then you can get their location and show it on the map. So, even it is a far distance between you and your friend. You can have fun together. That is our software Findyourfriendlocation.

Att applicera ansiktsigenkänning direkt på en mobiltelefon är en utmanande uppgift, inte minst med tanke på den begränsade minnes- och processorkapaciteten samt den stora variationen med avseende på ansiktsuttryck, hållning och ljusförhållande i inmatade bilder.

Det är fortfarande långt kvar till ett färdigutvecklat, robust och helautomatiskt ansiktsigenkänningssystem för den här miljön. Men resultaten i det här arbetet visar att genom att plocka ut feature-värden från lokala regioner samt applicera en välgjord warpstrategi för att minska problemen med variationer i position och rotation av huvudet, är det möjligt att uppnå rimliga och användbara igenkänningsnivåer. Speciellt för ett halvautomatiskt system där användaren har sista ordet om vem personen på bilden faktiskt är.

Med ett galleri bestående av 85 personer och endast en referensbild per person nådde systemet en igenkänningsgrad på 60% på en svårklassificerad serie testbilder. Totalt 73% av gångerna var den rätta individen inom de fyra främsta gissningarna.

Att lägga till extra referensbilder till galleriet höjer igenkänningsgraden rejält, till nästan 75% för helt korrekta gissningar och till 83,5% för topp fyra. Detta visar att en strategi där inmatade bilder läggs till som referensbilder i galleriet efterhand som de identifieras skulle löna sig ordentligt och göra systemet bättre efter hand likt en inlärningsprocess.

Detta exjobb belönades med pris för "Bästa industrirelevanta bidrag" vid Svenska sällskapet för automatiserad bildanalys årliga konferens i Lund, 13-14 mars 2008.

Applying face recognition directly on a mobile phone is a challenging proposal due to the unrestrained nature of input images and limitations in memory and processor capabilities.

A robust, fully automatic recognition system for this environment is still a far way off. However, results show that using local feature extraction and a warping scheme to reduce pose variation problems, it is possible to capitalize on high error tolerance and reach reasonable recognition rates, especially for a semi-automatic classification system where the user has the final say.

With a gallery of 85 individuals and only one gallery image per individual available the system is able to recognize close to 60 % of the faces in a very challenging test set, while the correct individual is in the top four guesses 73% of the time.

Adding extra reference images boosts performance to nearly 75% correct recognition and 83.5% in the top four guesses. This suggests a strategy where extra reference images are added one by one after correct classification, mimicking an online learning strategy.

This thesis is the result of a thorough process that started the fall of 2005. It began with a brief study of the possibilities offered by NFC, and continued to look at the technology from the perspective of using the mobile phone as a smartcard for payment and ticketing. The process then continued with a thorough study of existing smartcard standards, communication protocols and technology for realizing a solution. The work continued with an analysis of the problem at hand and exploring the requirements such a system would have to meet. The analysis led to a design which has been implemented into a working prototype. The development process of the thesis has followed the outline given in section 1.5. The evaluation and conclusion steps are carried out in regards to the result of this thesis. They are not the result of an evaluation and conclusion regarding the complete electronic ticketing system. The discussion and conclusion sections will still include elements from the complete system, but they can not be considered results from the design science process. The described system and implementation can be analyzed in many ways, but two important ones are part of the thesis discussion. Section 8.1 provides a discussion of the technical solution and the choices that will guide further development. Section 8.2 looks at the system from a more commercial view. The system is based on an analysis of user needs, and the accuracy of these analyses most likely has impact on the user adoption and commercial success of the system.

The aims of this thesis work were divided into two main areas. The first area was an investigation of the extremely low frequency magnetic fields in urban environment and from electrical devices. The second area was mobile phone provocation studies to investigate skin temperature increase and headaches attributed to mobile phone use. The magnetic flux density was measured along 17 km of pavement in an urban area of Trondheim.

The magnetic flux density in summer was quite small compared to other cities (mean value 0.13 μT). In winter when it snows, the mean value of the magnetic flux density was almost seven times greater (0.90 μT) compared to summer conditions. The two main reason for the increased magnetic flux density in winter are increased power consumption due to electrical indoor heating and electrical heating of the pavement to get rid of snow and ice. The highest recorded measurements above net stations in pavement were higher in Trondheim than in other cites (37 μT). The basic restrictions were not exceeded.

Spectral measurements on electrical devices showed that the spectral distribution of the current drawn to the device does not necessarily reflect the spectral distribution of magnetic flux density around the device. Mapping of the magnetic flux densities around mobile phones was emphasized.

Skin temperature measurements after mobile phone use showed that there was a statistically significant temperature rise on the cheek and on the ear. However, this temperature rise was found to be mainly caused by insulation and impeded convection prevention of convection which the mobile phone device itself causes. There was not a significant additional heating by the RF-radiation emitted.

In a double blind provocation study, all subjects who went through a mobile phone provocation study reported typical headache symptoms at an open selection test for participation in the study. The study consisted of 65 pairs of double blind tests. The result did not give any evidence that RF fields caused any pain or discomfort in the head. Subjects displayed symptoms at both RF-exposure and SHAM-exposure and the result could most likely be explained by negative expectations, i.e. a nocebo effect. There was no statistically significant change in heart rate and/or blood pressure.

This paper presents the findings of a qualitative study designed to describe the experience of HIV medication adherence using a mobile phone application. For the purpose of this qualitative study, nine semi-structured focus group discussions were conducted over a three-month period at an AIDS service organization in Central Texas. The data were analyzed following the principles of thematic analysis. During analysis, four themes were identified and relations between these themes were delineated to reflect the experiences of the 23 participants. Improving adherence to antiretroviral therapy is key in reducing the morbidity and mortality of HIV disease; and daily medication adherence may prevent the occurrence of the development of drug resistant mutant strains of HIV (Mbuagbaw et al., 2011). Adherence to ART may be complex secondary to person, behavioral, and treatment factors (Halkitis, Palamar, & Mukjerjee, 2008); and noncompliance to taking daily HIV medications may be considered a community health issue secondary to risk for viral transmission. The mobile phone application, Care4TodayTM Mobile Health Manager, was the intervention tool; and collection of focus group discussion outcomes over a three-month period with baseline versus end-of-study data determined the feasibility and acceptability of this medication adherence intervention. The greater the intention to engage in a behavior, such as daily adherence to HIV medication regimes, the greater is the likelihood of its performance. The findings suggest that when individuals are offered the necessary resources, such as a mobile phone medication reminder application, they may have greater success in performing the behavior.

The number of different identities and credentials used for authentication towards services on the Internet has increased beyond the manageable. Still, the most common authentication scheme is based on usernames and passwords which are neither secure nor user-friendly. Hence, better solutions for simplified, yet secure authentication, is required in the future. This thesis present an authentication scheme based on a One-Time Password (OTP) MIDlet running on a mobile phone for unified authentication towards any type of service on the Internet. The scheme is described in detail by an analysis and a design model. Based on the analysis and design an implementation of a prototype has been developed using Java. The security aspects of scheme are thoroughly evaluated in a security evaluation which identifies threats, security objectives and possible attacks. The proposed solution offers a strong authentication scheme which can substitute many of the authentication schemes we are using to day. Not only can it replace the standard username/password scheme, but due to its security services it can also replace stronger schemes such as existing OTP and smartcard solutions. Therefore the solution is suitable for many services on the Internet which requires authentication such as Internet banking, corporate intranet, Internet stores and e-Government applications.

Localization is projected to play a critical role in mobile computing applications. Nevertheless, the state of the art is inadequate especially when operating on mobile devices. More specifically, the on-phone GPS sensor has an unacceptable energy consumption and does not operate indoors. Alternate localization techniques, based on WiFi or GSM, alleviate some of the GPS limitations but provide degraded accuracy and assume pre-installed infrastructure. As a result, these solutions need extensive war-driving for collecting location fingerprints and, in many instances, limit services to regions close to drivable paths. Moreover, when infrastructure is scarce or missing, the localization accuracy is poor. Lastly, relying on hardware deployments is costly and raises scalability concerns when targeting wide regions.

To address the shortcomings of current solutions, we propose four new localization systems: (1) CompAcc enables energy-efficient, war-driving-free localization using the phone inertial sensors and digital maps, (2) Escort provides indoor localization by exploiting the phone inertial sensors and social environments where people are mobile, (3) SurroundSense enables indoor logical localization (e.g., inside Target) by sensing the user ambiance through the phone sensors, and (4) EnLoc proposes energy-efficient localization via personalized mobility profiling and predictions.