Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-01T21:30:49Z No. of bitstreams: 1 AnnaGiselleCamaraDantasRibeiro_TESE.pdf: 23598503 bytes, checksum: 4aa3b62cec65945d371ff9ad8c137f86 (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2016-02-16T20:09:04Z (GMT) No. of bitstreams: 1 AnnaGiselleCamaraDantasRibeiro_TESE.pdf: 23598503 bytes, checksum: 4aa3b62cec65945d371ff9ad8c137f86 (MD5) / Made available in DSpace on 2016-02-16T20:09:04Z (GMT). No. of bitstreams: 1 AnnaGiselleCamaraDantasRibeiro_TESE.pdf: 23598503 bytes, checksum: 4aa3b62cec65945d371ff9ad8c137f86 (MD5) Previous issue date: 2014-09-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / O aumento da popula??o mundial, com propor??o maior de idosos, acarreta no aumento do n?mero de indiv?duos com perda visual, sendo a catarata a maior causa de cegueira no mundo. A Catarata ? uma patologia dos olhos que consiste na opacidade parcial ou total do cristalino (lente natural do olho) ou de sua c?psula. Pode ser desencadeada por v?rios fatores, como traumatismo, idade, diabetes mellitus, uso de medicamentos, entre outros. Sabe-se que o atendimento por oftalmologistas no Brasil nas ?reas rurais e mais pobres ? inferior ao necess?rio e muitos pacientes com doen?as trat?veis como a Catarata ficam sem diagn?stico e consequentemente sem tratamento. Neste contexto, esse projeto tem como proposta o desenvolvimento do OPTICA, um sistema de tele-oftalmologia que utiliza smartphones para detec??o de urg?ncias oftalmol?gicas, disponibilizando um aux?lio ao diagn?stico a Catarata utilizando sistemas inteligentes e t?cnicas de processamento de imagens. As imagens ser?o capturadas por um celular com uma lente especial acoplada a c?mera e juntamente com um question?rio com informa??es do paciente ser?o transmitidos de forma segura via a plataforma Sana Mobile (sana.mit.edu) para uma central online de laudos que disp?e de um programa inteligente de auxilio ao diagn?stico a Catarata e de m?dicos oftalmologistas que ir?o analisar as informa??es e emitir o laudo do paciente. Desta forma, o OPTICA permite levar atendendimento oftalmol?gico a popula??o menos favorecida e em ?reas remotas , melhorando a triagem de pacientes graves e aumentando o acesso ao diagn?stico e tratamento. / The increasing in world population, with higher proportion of elderly, leads to an increase in the number of individuals with vision loss and cataracts are one of the leading causes of blindness worldwide. Cataract is an eye disease that is the partial or total opacity of the crystalline lens (natural lens of the eye) or its capsule. It can be triggered by several factors such as trauma, age, diabetes mellitus, and medications, among others. It is known that the attendance by ophthalmologists in rural and poor areas in Brazil is less than needed and many patients with treatable diseases such as cataracts are undiagnosed and therefore untreated. In this context, this project presents the development of OPTICA, a system of teleophthalmology using smartphones for ophthalmic emergencies detection, providing a diagnostic aid for cataract using specialists systems and image processing techniques. The images are captured by a cellphone camera and along with a questionnaire filled with patient information are transmitted securely via the platform Mobile SANA to a online server that has an intelligent system available to assist in the diagnosis of cataract and provides ophthalmologists who analyze the information and write back the patient?s report. Thus, the OPTICA provides eye care to the poorest and least favored population, improving the screening of critically ill patients and increasing access to diagnosis and treatment.

abstract: The widespread adoption of mobile devices gives rise to new opportunities and challenges for authentication mechanisms. Many traditional authentication mechanisms become unsuitable for smart devices. For example, while password is widely used on computers as user identity authentication, inputting password on small smartphone screen is error-prone and not convenient. In the meantime, there are emerging demands for new types of authentication. Proximity authentication is an example, which is not needed for computers but quite necessary for smart devices. These challenges motivate me to study and develop novel authentication mechanisms specific for smart devices. In this dissertation, I am interested in the special authentication demands of smart devices and about to satisfy the demands. First, I study how the features of smart devices affect user identity authentications. For identity authentication domain, I aim to design a continuous, forge-resistant authentication mechanism that does not interrupt user-device interactions. I propose a mechanism that authenticates user identity based on the user's finger movement patterns. Next, I study a smart-device-specific authentication, proximity authentication, which authenticates whether two devices are in close proximity. For prox- imity authentication domain, I aim to design a user-friendly authentication mechanism that can defend against relay attacks. In addition, I restrict the authenticated distance to the scale of near field, i.e., a few centimeters. My first design utilizes a user's coherent two-finger movement on smart device screen to restrict the distance. To achieve a fully-automated system, I explore acoustic communications and propose a novel near field authentication system. / Dissertation/Thesis / Doctoral Dissertation Computer Science 2014

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / A falta de um manejo adequado da irrigaÃÃo por parte da maioria dos produtores instalados nos perÃmetros pÃblicos irrigados no estado do Cearà à considerado como o principal fator com interferÃncia direta na produtividade, custo de produÃÃo, qualidade dos produtos comercializados e principalmente na questÃo ambiental, onde o uso inadequado da Ãgua de nossos mananciais poderà comprometer seriamente nossas geraÃÃes futuras. A iniciativa de desenvolvimento de ferramentas para auxiliar o produtor a realizar um manejo de irrigaÃÃo satisfatÃrio, que seja acessÃvel e de fÃcil operaÃÃo à uma meta que devemos sempre definir como prioritÃria. Esse trabalho visa o desenvolvimento de um aplicativo para dispositivos mÃveis, capaz de utilizar uma base de dados prÃpria na realizaÃÃo do cÃlculo do tempo diÃrio de irrigaÃÃo para cada cultura em uma determinada data. Foram utilizadas tÃcnicas e ferramentas de desenvolvimento de software, especÃficas para a plataforma mÃvel Android. O aplicativo visa auxiliar na conduÃÃo de um manejo com uso racional de Ãgua nos perÃmetros irrigados localizados no estado de CearÃ, semiÃrido nordestino, mitigando a falta da assistÃncia tÃcnica especializada em agricultura de precisÃo, utilizando bancos de dados com informaÃÃes necessÃrias para o cÃlculo da necessidade hÃdrica e posterior recomendaÃÃo do tempo de irrigaÃÃo. Entre os bancos de dados instalados, conta-se com as series histÃricas da âevapotranspiraÃÃo potencial de referÃnciaâ dos Ãltimos dez anos nas regiÃes representativas onde se encontram implantados os oito principais perÃmetros irrigados do estado do CearÃ: Curu-Paraipaba, Pentecostes, Baixo AcaraÃ, Araras Norte, Jaguaribe Apodi, Morada Nova, Tabuleiros de Russas e IcÃ-Lima Campos, alÃm dos bancos de dados com informaÃÃes relativas ao âcoeficiente de cultivoâ e âPercentual de coberturaâ dos principais cultivos explorados nos perÃmetros. O sistema desenvolvido apresenta uma nova abordagem para o manejo da irrigaÃÃo, fazendo uso da mobilidade disponÃvel em celulares para permitir que os usuÃrios realizem o cÃlculo do tempo de irrigaÃÃo diÃrio em qualquer um dos perÃmetros irrigados do estado do CearÃ. A utilizaÃÃo do aplicativo em simulaÃÃo para o PerÃmetro Irrigado Baixo AcaraÃ, demonstrou uma reduÃÃo de aproximadamente 26 % em relaÃÃo a utilizaÃÃo atual de Ãgua na irrigaÃÃo, permitindo concluir-se que o seu uso proporciona um bom manejo de irrigaÃÃo e poderà resultar em uma economia de Ãgua necessÃria para reduÃÃo dos impactos recorrentes dos longos e repetitivos perÃodos de estiagem sobre os recursos hÃdricos do estado do CearÃ. / The lack of a proper irrigation management by the majority of producers in irrigated public areas in the state of Cearà 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 CearÃ, 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 Cearà state: Curu-Paraipaba, Pentecostes, Baixo AcaraÃ, Araras Norte, Jaguaribe Apodi, Morada Nova, Tabuleiros de Russas e IcÃ-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 Cearà state. The use of the application in simulation for the Irrigated Perimeter Baixo Acaraà 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 CearÃ.

Fundação de Apoio a Pesquisa e à Inovação Tecnológica do Estado de Sergipe - FAPITEC/SE / How do Sergipe's youth access journalistic content through smartphones? That is the first question of this essay. To answer it, the chosen scenario for the research was a state school, located in Aracaju, State of Sergipe, where the observation and interviewing process were made with ten high school senior students. The goal was to find out if those digital natives – people who have grown up submerged in digital culture, following up the emergence and development of technologies – are actual journalistic content readers or merely users inserted in the cyberspace. In other words, if those young people are just surfing through content without taking any action or reflecting about it, or if they have a more comprehensive reading, reflecting about what they read, considering the new digital environments created from mobile comunication platforms, in particular the production and flowing of journalistic content in smartphones. Six hypotheses were brought up in the research: 1) Schools offer a favorable environment for using mobile comunication technology – smartphones – for educational and informative purposes; 2) Young people have smartphones as their main source of information, with less use of other tecnologies and media types; 3) Young people don't immerse nor look for new information about what they read daily; 4) The new technologies made possible for the young to take part, create new content and be more critical about what they access; 5) Young people in digital environment are cautious and do not give credibility to every content spread on the internet; 6) School environment has influence and motivates the young to obtain journalystic information. In the course of the research, other questions were made, such as 'what' young people absorbe in the journalistic sphere while using smartphones and 'why' they choose it. For that, the method of approach chosen was the inductive one and the procedure method was the observation of ethnographic inspiration, in order to allow a more in - depth look at the studied object. An observation work of ethnographic inspiration, aiming to make an in-depth look about the study subject possible. The chosen techniques for the data collection were the non-participant direct observation and in-depth semi-structured interviewing. The results confirmed that the smartphone is the main means of reading journalistic content for young people, being a tool that stimulates and facilitates the search for information. It was possible to collect expressions that indicated an active stance of the youngster in this reading, with a critical eye and motivation for discoveries in interaction with other young people. / Como os jovens sergipanos acessam conteúdo jornalístico por meio do smartphone? Essa é a questão inicial desta dissertação. Para respondê-la, o cenário escolhido para a pesquisa foi uma escola estadual, localizada em Aracaju/SE, onde foi realizada a observação e a entrevista com 10 estudantes do 3º Ano do Nível Médio. Buscou-se descobrir se esses jovens nativos digitais – que cresceram imersos na cultura digital acompanhando o surgimento e a evolução das tecnologias – são leitores imersivos em conteúdos jornalísticos ou se são meros usuários inseridos no ciberespaço. Em outras palavras, se esses jovens são apenas transeuntes entre as informações, sem qualquer atuação e reflexão sobre o que consomem ou se esses jovens se aprofundam na leitura, refletem sobre o que leem, considerando os novos ambientes digitais criados a partir de plataformas da comunicação móvel, particularmente a produção e circulação de conteúdos jornalísticos em aparelhos celulares no padrão smartphone. Seis hipóteses foram levantadas na pesquisa: 1) a escola tem ambiente favorável para o uso da tecnologia de comunicação móvel – smartphone – para fins educativos e informativos; 2) os jovens utilizam o smartphone como principal fonte de informação em detrimento de outras tecnologias e meios de comunicação; 3) os jovens não se aprofundam e nem buscam novas informações sobre o que leem no dia a dia; 4) as novas tecnologias possibilitaram jovens mais participativos, criadores de conteúdo e com um olhar mais crítico sobre o que acessam; 5) em ambiente digital, os jovens são cautelosos e não dão credibilidade a todo conteúdo divulgado na internet; 6) o ambiente escolar influencia e motiva os jovens ao consumo de informação jornalística. No decorrer da pesquisa, outras questões foram percebidas, como ‘o que’ os jovens consomem no âmbito jornalístico utilizando o smartphone e o ‘porque’ da escolha desse consumo. Para tanto, o método de abordagem escolhido foi o indutivo e o método de procedimento foi a observação de inspiração etnográfica, com vistas a possibilitar um olhar mais aprofundado sobre o objeto estudado. As técnicas utilizadas para a coleta de dados consistiram na observação direta não participante e na entrevista semiaberta em profundidade. Os resultados confirmaram que o smartphone é o principal meio de leitura de conteúdos jornalísticos para os jovens, sendo uma ferramenta que estimula e facilita a busca por informações. Foi possível recolher nos depoimentos expressões que indicaram uma postura ativa do jovem nessa leitura, com olhar crítico e motivação para descobertas em interação com outros jovens. / São Cristóvão, SE

Augmented Reality (AR) can be described as one of possible steps between real world and fully virtual reality. Into this mixed reality we can make an overlay with virtual objects onto the real world typically by capturing camera images in real-time to produce a new layer to the environment with which we can interact. Mobile Augmented Reality (MAR) is a term used when equipment through which we achieve AR is small in size and typically easy to carry e.g. a smartphone or a tablet. The concept of using AR in facilitating learning and improving its quality seems to attract more attention in the academic world in recent years. One of the areas that receive much attention is AR language learning. In this thesis an experiment on a group of 20 people was conducted to answer the question: “Is MAR language learning system a viable solution for language learning?” For the purpose of the experiment an AR Language Learning Tool was designed for Android smartphones. This AR Language Learning Tool facilitated vocabulary learning by displaying 3D objects along with their spelling and providing audio of pronunciation. Participants were divided into an equal control group and test group. The control group learned new vocabulary through classic flashcards while the test group used the previously designed AR Language Learning Tool. The Vocabulary Knowledge Scale questionnaires were provided for both groups right after learning and one week later. By performing statistical analysis with Student’s t-test on gathered data it was discovered that there is a positive improvement in long term recall rate in the AR Language Learning Tool group when compared with the flashcards learning group. No difference was found in short term recall rate between both groups. Participants also provided feedback about their quality of experience and enthusiasm for new learning methods. Their answers were very positive and provided proof that mobile AR is a viable method of learning vocabulary.

Mobile computing devices, in particular smartphones are powered from Lithium-ion batteries, which are limited in capacity. With the increasing popularity of mobile systems, various text input methods have been developed to improve user experience and performance. Briefly, text input method is a user interface that can be used to compose an electronic mail, configure mobile Virtual Private Network, and carryout bank transactions and online purchases. Efficient energy management in these systems requires an extensive knowledge of where and how the energy is being used. This thesis investigates the energy consumption of text input methods on various smartphones. Hence, the authors modeled the energy consumption profile of text input methods on smartphones and analyze the energy usage benchmarks of the battery. This thesis presents a systematic technique to conduct application specific measurements. The data analysis showed substantial variations in the energy consumptions of various text input methods on a smartphone. / The main objective of this research is to find a systematic and measurement based method to evaluate the energy efficiency of the selected text input methods used on smartphones namely: SwiftKey, Swype, and Zimpl. Using Power Monitor equipment and MATLAB, the energy consumption log files of the text input methods were collected for each of the smartphones, and analyzed. This research introduces an optimized technique to carry-out application specific test on smartphones. It is hoped that the thesis will be beneficial to smartphone battery manufacturers and developers of text input techniques on how to make users’ smartphone battery last longer.

Svenskarna och   internet (2014) points out that the use of smartphones continues to grow,   despite this only 14 percent of the elderly in the age of 60 or more,   interacts with a smartphone daily. The reason why older people do not use   smartphones are thought to be because the technology is difficult and hard. The purpose of this   study was to find shortcomings in usability for older people when interacting   with a smartphone as well as what improvements should be made to increase the   usability. To achieve this purpose five older respondents in the age of 60   years or older were observed and interviewed. Furthermore, a separate model   has been created based on previous research to analyze the results. The analysis   resulted in a revised model with existing shortcomings and pronounced   improvement proposals. The shortcomings found in smartphone user interfaces   are lack of information on how to perform different tasks, which means they   are guessing solutions, another lack is that icons are alike. According to   the study, descriptive texts should be provided to each icon. The   improvements that older people would prefer to increase the usability are   that it should be one gesture to navigate through the phone which is the   dragged gesture, pointed information in a smartphone how they perform their   tasks and icons as well as buttons should be named after performance.   Proposals for future research are to investigate differences between older   novices and older skilled users of smartphones and at what age older people   are getting worse in interacting with smartphones.

In the global market many smartphones vendors struggle to reach more customers. The competition leads to vendors developing technologies that are platform dependent, to keep their customers. This means that customers cannot take advantage of their skills in the integration of other operating systems, which makes them locked-in with their current supplier. Therefore we want to examine the concept of skill transferability and see how knowledge can be transferred to another operating system. To examine this we conducted a test where Android users had to perform tasks on iOS and Windows Phone. These tests were observed to examine whether the knowledge required to perform the task where transferable from Android or not. The results showed that when an operating system is similar to Android it provides more opportunity for the users to use their previous knowledge about their operating system and the technology play a major role in the differences between various ages.

Användningen av smartphones ökar med rasande fart och problemet som app-utvecklare har är att det finns flera olika plattformar. För att nå ut till så många användare som möjligt måste alltså en app tillverkas för varje plattform. Detta kräver dels kunskap i utveckling för respektive plattform men också mycket tid och därmed pengar eftersom varje enskild app måste utvecklas i flera versioner. En lösning på detta kan dock vara så kallade multiplattformsutvecklingsverktyg där utvecklaren kan använda samma kodbas för flera olika plattformar. Men håller dessa verktyg måttet? Denna studie undersöker dels vilka multiplattformsutvecklingsverktyg som finns att tillgå idag samt jämför hur mycket det skiljer i slutresultatet för en likvärdig app tillverkad i tre utav dessa multiplattformsutvecklingsverktyg. Resultatet visar att det skiljer en hel del. Studien avslutas med en diskussion om resultatet och dess trovärdighet samt ger förslag på hur studien skulle kunna vidareutvecklas.

The present thesis deals with the use of mobile technologies in the follow-up to ERP systems. Goal is to analyze the integration of mobile technologies into the corporate environment. The thesis at first analyses the existing state, reasons for and benefits of use of mobile technologies in the corporate sphere with the use of the research methodology of semi-structured interviews. This part is concluded with the author's evaluation of investigated cases and with identification of other related types of solution in practice. The final part of the thesis is dealt with the case study in a Czech company. This part of the thesis starts with an analysis of the current state of information and communication technologies in the company on the basis of consultations and visits to employee workplaces; subsequently it specifies opportunities for improvement of support of selected corporate processes for which possible solutions are proposed in the final part of the thesis. The thesis brings some still unpublished information with regard to the use of mobile technologies in the business environment.