The Web is increasingly being accessed by portable, multi-touch wireless devices. Despite the popularity of platform-specific (native) mobile apps, a recent study of smartphone usage shows that more people (81%) browse the Web than use native apps (68%) on their phone. Moreover, many popular native apps such as BBC depend on browser-like components (e.g., Webview) for their functionality. The popularity and prevalence of web browsers on modern mobile phones warrants characterizing existing and emerging threats to mobile web browsing, and building solutions for the same. Although a range of studies have focused on the security of native apps on mobile devices, efforts in characterizing the security of web transactions originating at mobile browsers are limited. This dissertation presents three main contributions: First, we show that porting browsers to mobile platforms leads to new vulnerabilities previously not observed in desktop browsers. The solutions to these vulnerabilities require careful balancing between usability and security and might not always be equivalent to those in desktop browsers. Second, we empirically demonstrate that the combination of reduced screen space and an independent selection of security indicators not only make it difficult for experts to determine the security standing of mobile browsers, but actually make mobile browsing more dangerous for average users as they provide a false sense of security. Finally, we experimentally demonstrate the need for mobile specific techniques to detect malicious webpages. We then design and implement kAYO, the first mobile specific static tool to detect malicious webpages in real-time.

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With the diffusion of smartphones in the United States, the news industry is trying to turn this mobile innovation into an effective vehicle for delivering news anytime, anywhere. But does smartphone adoption mean news consumption via smartphones? To provide insight to this question, a national Web-based survey was conducted to explore smartphone adopters vs. non adopter, smartphone news consumers vs. non-consumers, and younger vs. older smartphone news consumers. Smartphone adopters were younger, had higher household incomes, and used news media more often than smartphone non-adopters. Most of the smartphone adopters primarily used their phones as an interpersonal communication device. Unlike smartphone adopters, smartphone news consumers were more likely to be male. Similar to smartphone adopters, they were younger and used news media more often than non-consumers of smartphone news. Moreover, smartphone news consumers used portal news sites more than newspaper, television, or social networking sites. As such, they also expressed higher satisfaction with portal news sites. A complementary relationship was found between smartphone news and traditional and online news media. Predictors of smartphone adoption included age and social pressure; predictors of adopting smartphones for news included news interest, gender, education, and income. In addition, news interest was a significant predictor for the amount of time users spent on smartphone news, while age, income and news interest were significant predictors for the number of times (frequency) users accessed news via smartphones. Even though younger smartphone news consumers showed lower news interests and used traditional news media less often than older smartphone news consumers, they did not spend any less time or access different kinds of news topics any less than their older counterparts. More of the younger than older smartphone news consumers followed health and fitness, science and technology, and entertainment news. / text

Magistro darbe nagrinėjamos mobilios technologijos bei ju naudojimas mokyme. Šio darbo tikslas – aprašyti mobilias mokymui tinkamas technologijas, atlikti ju naudojimo mokyme analize. Pirmiausia aprašomos ir nagrinėjamos mokymui tinkamos mobiliosios technologijos, lyginamos šiu priemoniu galimybės pagal ju sudėtinguma, patoguma vartotojui ir funkciju ivairove. Pateikta praktinio mobiliuju technologiju naudojimo mokyme analizė – atlikta vykdomu Europoje ir pasaulyje mobiliuju technologiju taikymo mokyme projektu ir ju ataskaitu apžvalga. Atlikta Lietuvos moksleiviu nuostatu apie mobilias technologijas ir ju naudojima mokymui anketinė apklausa ir gautu duomenu analizė. / Modern technologies and the usage of them in teaching are being analysed in the Master’s thesis. The aim of this work is to describe mobile technologies suitable for teaching, to have the analysis of their usage in teaching. First of all mobile technologies suitable for teaching are being discussed, the possibilities of these means, having in mind their complexity, convenience for the user and the range of their functions are being compared. Practical analysis of mobile technologies is presented – a review of reports on the projects of mobile technologies which are applied in Europe and in the world is made. The analysis of the attitude of Lithuanian schoolchildren towards modern technologies and their usage in teaching as well as a questionnaire and the analysis of all the data was made.

This essay deals with the influence of leadership on student use of Smart phones as an ICT tool at after school care. I use a qualitative, hermeneutical method that departs from two stories. I also use qualitative interviews with both structured and unstructured questions. My reflections and interpretations are, through the interviews, complemented by my colleagues’ views of the use of Smart phones and how that is affected by how the activities are managed. I have faced a dilemma in my stories where I have to choose between following the school’s rules or help the students that need help with the use of Smart phones. Reflecting on the stories leads me to view my own leadership and style of leadership in a critical light and to view myself in a wider context within a problematic organization with a hierarchical leadership. This leads to other dilemmas that occur in a school organization, where helpful factors to a change can be seen in different perspectives with the open dialogue as an advantage.

This thesis focuses on improving the user experience for computer vision-based Augmented Reality (AR) applications on smartphones. The first part shows our proposed methods to enhance image binarisation. This improves the marker detection results in mobile AR applications. The comparisons of the original ARToolKit binarization method, our proposed histogram-based automatic thresholding and our histogram equalization based thresholding show that the histogram-based automatic thresholding produces a relatively better result under extreme and normal lighting conditions but slightly reduces the ARToolKit framerate. The second part introduces a new fast painterly rendering algorithm which produces an immersive experience for mobile AR users. The proposed algorithm has low complexity and achieves a real-time performance on smartphones. In addition, this study has carried out a preliminary experiment comparing mobile GPU-based image processing algorithms with CPU-based equivalent on smartphones. The result indicates that the GPU-based implementations perform better than the CPU when processing relatively large sized images.

Darbe ištirti vartotojų poreikiai tokiai programai, reikalavimai programai. Išnagrinėtos mobiliems įrenginiams skirtos operacinės sistemos Android ir iOS. Palyginti panašūs produktai. Remiantis surinkta informacija, suprojektuota ir sukurta trijų lentelių duomenų bazė informacijai apie lankytinas vietas saugoti. Suprojektuota ir sukurta mobili aplikacija, kurioje yra galimybė rasti netoliese esančias lankytinas vietas, gauti informaciją apie jas, sudėlioti maršrutą pasirinktoms vietoms aplankyti. / During this work, consumer needs and app requirements were examined. Operating systems Android and iOS were investigated. Similar products were compared. Focusing on collected data, the database for saving information about places to visit was designed and developed. The database consists of three tables. Also, an app which helps finding nearby places of interest, gives information about those places, makes route that would help visiting those places, was designed and developed.

Σκοπός αυτής της διπλωματικής εργασίας ήταν η ανάπτυξη μιας ασφαλούς εφαρμογής για έξυπνο τηλεφωνο (smartphone) με λειτουργικό σύστημα Microsoft Windows Mobile 6 χρησιμοποιώντας το .NET Compact Framework 3.5 (.NET CF) αλλά και η αποτίμηση της απόδοσής της. Αρχικά αξιολογήσαμε την απόδοση των αλγόριθμων AES, DES, MD5, SHA1 που παρέχει το .NET CF. Επειδή το .NET CF 3.5 δεν παρέχει κάποια συνάρτηση ασφαλούς κατακερματισμού, υλοποιήσαμε δύο παραλλαγές αλγόριθμου HMAC. Η πρώτη βασίζεται στον αλγόριθμο MD5 και η δεύτερη στο SHA1. Η αποτίμηση της απόδοσης έγινε για μεγέθη εισόδων 1 ΚΒ, 4 ΚΒ, 32 ΚΒ, 512 ΚΒ και 1 ΜΒ. Από τα αποτελέσματα που προέκυψαν διαπιστώσαμε ότι ο AES είναι πολύ πιο αργός από τον DES. Επίσης ο SHA1 είναι πιο αργός από τον MD5, κάτι το οποίο ισχύει για τον HMAC-SHA1 συγκριτικά με τον HMAC-MD5. Αναπτύξαμε στη συνέχεια μία εφαρμογή για την ασφαλή αποθήκευση αρχείων σε smartphone. H εφαρμογή υλοποιεί για τη διαχείριση κλειδιών κρυπτογράφησης τόσο το κλασσικό πρωτόκολλο, όσο και τις δύο παραλλαγές του πρωτοκόλλου ελεγχόμενης τυχαιότητας, το οποίο έχει προταθεί στη βιβλιογραφία. Ολοκληρώνοντας την εργασία μας, αποτιμήσαμε την απόδοση των τρίων πρωτοκόλλων για διάφορα μεγέθη αρχείων. Τα αποτελέσματα των μετρήσεων μας επιβεβαιώνουν ότι το πρωτόκολλο ελεγχόμενης τυχαιότητας επιτυγχάνει προηγμένα χαρακτηριστικά ασφάλειας με μικρό υπολογιστικό κόστος στην πλατφόρμα Microsoft Windows Mobile 6. / -

Submitted by Kleber Silva (kleberbs@ufba.br) on 2017-05-30T21:13:49Z No. of bitstreams: 1 Tese - Artur kronbauer.pdf: 3711111 bytes, checksum: 0893116dd63db0adde369f66d35d7de9 (MD5) / Approved for entry into archive by Vanessa Reis (vanessa.jamile@ufba.br) on 2017-06-01T12:14:35Z (GMT) No. of bitstreams: 1 Tese - Artur kronbauer.pdf: 3711111 bytes, checksum: 0893116dd63db0adde369f66d35d7de9 (MD5) / Made available in DSpace on 2017-06-01T12:14:35Z (GMT). No. of bitstreams: 1 Tese - Artur kronbauer.pdf: 3711111 bytes, checksum: 0893116dd63db0adde369f66d35d7de9 (MD5) / A onipresença de novas tecnologias associada a diferentes formas de interação, à diversidade de características dos usuários e às interferências contextuais, criam novas barreiras para a avaliação da usabilidade dos aplicativos desenvolvidos para smartphones. As propriedades móveis fornecem maneiras de interação até certo ponto inusitadas, altamente dependente do cenário de interação, o que dificulta a reprodução em laboratório. Um dos desafios nessa área é propor abordagens que permitam realizar testes de usabilidade com a associação de dados quantitativos, contextuais e subjetivos em um mesmo experimento. Este trabalho apresenta um modelo e sua infraestrutura com o objetivo de propor uma nova abordagem que possibilite obter dados estatísticos referentes à usabilidade, contextualizados ao cenário de interação e com interlocuções diretas com os usuários para a obtenção dos seus sentimentos com relação aos aplicativos utilizados. A abordagem proposta permite realizar experimentos por longos períodos de tempo, com a possibilidade da participação de um grande número de usuários e com o potencial para auxiliar a execução de experimentos tanto em cenários reais como em laboratório. Para comprovar a eficiência da abordagem, foram desenvolvidos dois experimentos: o primeiro, com usuários de aplicativos para smartphones, com o objetivo de verificar as potencialidades do processo de coleta e análise dos dados; o segundo, com desenvolvedores de softwares e analistas de banco de dados, com a finalidade de avaliar os procedimentos empregados para realizar o mapeamento das tarefas, a instrumentação dos aplicativos com métricas de rastreabilidade e validar os documentos que descrevem os processos envolvidos na configuração do ambiente de armazenamento e exploração dos dados de usabilidade, capturados durante as interações dos usuários finais.

ROCHA JÚNIOR, Odílio Coimbra. Desenvolvimento de um aplicativo para o manejo de irrigação utilizando a ferramenta “App inventor” na plataforma “Android”. 2015. 67 f. Dissertação (Mestrado em engenharia agrícola)- Universidade Federal do Ceará, Fortaleza-CE, 2015. / Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-06-28T19:44:32Z No. of bitstreams: 1 2015_dis_ocrochajunior.pdf: 3121689 bytes, checksum: e4efd8e1e745a4bd1938851b481c80e4 (MD5) / Approved for entry into archive by José Jairo Viana de Sousa (jairo@ufc.br) on 2016-06-30T22:47:34Z (GMT) No. of bitstreams: 1 2015_dis_ocrochajunior.pdf: 3121689 bytes, checksum: e4efd8e1e745a4bd1938851b481c80e4 (MD5) / Made available in DSpace on 2016-06-30T22:47:34Z (GMT). No. of bitstreams: 1 2015_dis_ocrochajunior.pdf: 3121689 bytes, checksum: e4efd8e1e745a4bd1938851b481c80e4 (MD5) Previous issue date: 2015 / The lack of a proper irrigation management by the majority of producers in irrigated public areas in the state of Ceará is considered the main factor with direct influence on productivity, cost of production, quality of products, and especially in the environmental issue, where the inappropriate use of water from our springs could seriously compromise our future generations. The initiative in the development of tools to assist the producer to carry out a satisfactory irrigation management that is accessible and of easy operation is a goal that should always be set as a priority. This work aims to develop an application for mobile devices, able to use its own database in the realization of the daily irrigation time calculation for each crop on a certain date. Techniques and software development tools were used specificly for the Android mobile platform. The application intends to assist in conducting a management with rational use of water in irrigated areas in the state of Ceará, semi-arid northeast, mitigating the lack of technical assistance specialized in precision farming, using databases with information necessary for the calculation of the need water and subsequent irrigation time recommendation. Among the installed databases, it has historical series of "potential reference evapotranspiration" for the past ten years in representative regions where the eight main irrigation schemes of the Ceará state: Curu-Paraipaba, Pentecostes, Baixo Acaraú, Araras Norte, Jaguaribe Apodi, Morada Nova, Tabuleiros de Russas e Icó-Lima Campos are located and also databases with information on the "crop coefficient" and "coverage percentage" of major crops exploited on the perimeters. This application was developed to present a new approach to irrigation management, making use of the available mobile phones in order to allow users to perform the calculation of the daily irrigation time in any of the irrigated perimeters of the Ceará state. The use of the application in simulation for the Irrigated Perimeter Baixo Acaraú demonstrated a reduction of approximately 26% over the current use of water in irrigation, allowing its use be concluded that provides good irrigation management and could result in an economy of water required to reduce the impact of recurring long and repetitive periods of drought on water resources of the state of Ceará. / A falta de um manejo adequado da irrigação por parte da maioria dos produtores instalados nos perímetros públicos irrigados no estado do Ceará é considerado como o principal fator com interferência direta na produtividade, custo de produção, qualidade dos produtos comercializados e principalmente na questão ambiental, onde o uso inadequado da água de nossos mananciais poderá comprometer seriamente nossas gerações futuras. A iniciativa de desenvolvimento de ferramentas para auxiliar o produtor a realizar um manejo de irrigação satisfatório, que seja acessível e de fácil operação é uma meta que devemos sempre definir como prioritária. Esse trabalho visa o desenvolvimento de um aplicativo para dispositivos móveis, capaz de utilizar uma base de dados própria na realização do cálculo do tempo diário de irrigação para cada cultura em uma determinada data. Foram utilizadas técnicas e ferramentas de desenvolvimento de software, específicas para a plataforma móvel Android. O aplicativo visa auxiliar na condução de um manejo com uso racional de água nos perímetros irrigados localizados no estado de Ceará, semiárido nordestino, mitigando a falta da assistência técnica especializada em agricultura de precisão, utilizando bancos de dados com informações necessárias para o cálculo da necessidade hídrica e posterior recomendação do tempo de irrigação. Entre os bancos de dados instalados, conta-se com as series históricas da “evapotranspiração potencial de referência” dos últimos dez anos nas regiões representativas onde se encontram implantados os oito principais perímetros irrigados do estado do Ceará: Curu-Paraipaba, Pentecostes, Baixo Acaraú, Araras Norte, Jaguaribe Apodi, Morada Nova, Tabuleiros de Russas e Icó-Lima Campos, além dos bancos de dados com informações relativas ao “coeficiente de cultivo” e “Percentual de cobertura” dos principais cultivos explorados nos perímetros. O sistema desenvolvido apresenta uma nova abordagem para o manejo da irrigação, fazendo uso da mobilidade disponível em celulares para permitir que os usuários realizem o cálculo do tempo de irrigação diário em qualquer um dos perímetros irrigados do estado do Ceará. A utilização do aplicativo em simulação para o Perímetro Irrigado Baixo Acaraú, demonstrou uma redução de aproximadamente 26 % em relação a utilização atual de água na irrigação, permitindo concluir-se que o seu uso proporciona um bom manejo de irrigação e poderá resultar em uma economia de água necessária para redução dos impactos recorrentes dos longos e repetitivos períodos de estiagem sobre os recursos hídricos do estado do Ceará.