This masters's thesis is studying the possibility of Create a synchronization tool for device running on Android. It is the ability to sync contacts from portable devices in a private cloud, which is here substituted by Directory server. For working with directory, server uses LDAP server and its implementation of OpenLDAP. The first part is aimed at the description of the structure and directory services. Following is analysis and separation requirements. The whole project is completed by proposals and implementation that relate to the safety and advanced synchronization.

This diploma thesis deals with a central user identification and personal data management on the Internet. The first part analyzes questions of a identification process and discusses the requirements for implementation, security and user-friendliness. Subsequently, the process is designed with respect to the defined requirements. A detailed overview of possible attacks to the system and means of protection against them is also included in the thesis. The described methods are as follows: Phishing, Man in the middle, hardware modification and acoustic keypress emissions. A practical design of a identification system is discussed in the second part of the thesis. It consists of two parts: a library implementable to individual Internet services requiring a user identification and a server centrally identificating the users and storing their personal data and passwords. An implementation in Joomla content management system is also described.

This work deals with design of PC remote control, which is able to control computer with operating system Windows and Linux using Wifi connection. There was also created necessary support software for both operating systems. Communication was secured by ciphering algorithm.

Die Arbeit beschäftigt sich mit der Integration von Methoden und Verfahren zur gesicherten Übertragung und zur Authentifizierung. Es werden dies bezüglich Realisierungsmöglichkeiten für die Erweiterung einer bestehenden Applikation aufgezeigt und diskutiert. Die Sicherheitsanforderungen an die Anwendung werden aufgezeigt und bestehende Technologien bezüglich ihrer Verwendbarkeit für eine Authentifizierung in der Anwendung evaluiert. Die Integration der Methoden und Verfahren erfolgt prototypisch in die gewählte Anwendung. Besonderer Wert wird dabei auf die Authentifizierung von Nutzern am System und die verschlüsselte Übertragung von Daten über nicht private Netze gelegt. Die Arbeit gibt einen Einblick in die kryptographischen Grundlagen und verwendeten Verfahren und Standards. Das Anwendungsgebiet wird beschrieben und die Nutzungsstrategie der Anwendung wird dargelegt. Die Integration der Verfahren und Mechanismen in die Anwendung erfolgt unter Berücksichtigung der vorher gesetzten Ziele und der Lösungsansatz wird prototypisch implementiert und diskutiert.

Das Semantic Web, eine Erweiterung des ursprünglichen World Wide Web um eine se- mantische Schicht, kann die Integration von Informationen aus verschiedenen Datenquellen stark vereinfachen. Mit RDF und der SPARQL-Anfragesprache wurden Standards etabliert, die eine einheitliche Darstellung von strukturierten Informationen ermöglichen und diese abfragbar machen. Mit Linked Data werden diese Informationen über ein einheitliches Pro- tokoll verfügbar gemacht und es entsteht ein Netz aus Daten, anstelle von Dokumenten. In der vorliegenden Arbeit werden Aspekte einer auf solchen semantischen Technologien basierenden Datenintegration betrachtet und analysiert. Darauf aufbauend wird ein System spezifiziert und implementiert, das die Ergebnisse dieser Untersuchungen in einer konkreten Anwendung realisiert. Als Basis für die Implementierung dient OntoWiki, ein semantisches Daten-Wiki.

Um die Vision eines Linked Data Webs zu verwirklichen werden effiziente halbautomatische Verfahren benötigt, um Links zwischen verschiedenen Datenquellen zu generieren. Viele bekannte Link Discovery Frameworks verlangen von einem Benutzer eine Linkspezifikation manuell zu erstellen, bevor der eigentliche Vergleichsprozess zum Finden dieser Links gestartet werden kann. Zwar wurden jüngst zeit- und ressourcenschonende Werkzeuge zur Ausführung von Linking-Operationen entwickelt, aber die Generierung möglichst präziser Linkspezifikationen ist weiterhin ein kompliziertes Unterfangen. Diese Arbeit präsentiert EAGLE - ein Werkzeug zum halbautomatischen Lernen solcher Linkspezifikationen. EAGLE erweitert das zeiteffiziente LIMES Framework um aktive Lernalgorithmen basierend auf Methoden der Genetischen Programmierung. Ziel ist es den manuellen Arbeitsaufwand während der Generierung präziser Linkspezifikationen für Benutzer zu minimieren. Das heißt insbesondere, dass die Menge an manuell annotierten Trainingsdaten minimiert werden soll. Dazu werden Batch- als auch aktive Lernalgorithmen verglichen. Zur Evaluation werden mehrere Datensätze unterschiedlichen Ursprungs und verschiedener Komplexität herangezogen. Es wird gezeigt, dass EAGLE zeiteffizient Linkspezifikationen vergleichbarer Genauigkeit bezüglich der F-Maße gernerieren kann, während ein geringerer Umfang an Trainingsdaten für die aktiven Lernalgorithmen benötigt wird. / On the way to the Linked Data Web, efficient and semi-automatic approaches for generating links between several data sources are needed. Many common Link Discovery frameworks require a user to specify a link specification, before starting the linking process. While time-efficient approaches for executing those link specification have been developed over the last years, the discovery of accurate link specifications remains a non-trivial problem. In this thesis, we present EAGLE, a machine-learning approach for link specifications. The overall goal behind EAGLE is to limit the labeling effort for the user, while generating highly accurate link specifications. To achieve this goal, we rely on the algorithms implemented in the LIMES framework and enhance it with both batch and active learning mechanisms based on genetic programming techniques. We compare both batch and active learning and evaluate our approach on several real world datasets from different domains. We show that we can discover link specifications with f-measures comparable to other approaches while relying on a smaller number of labeled instances and requiring significantly less execution time.

Dentro del marco teórico didáctico existen varias investigaciones sobre cómo se debe corregir al alumnado que estudia lenguas extranjeras, pero la mayoría de las investigaciones faltan la perspectiva del alumnado, es decir, el recipiente de la corrección. Por eso, el propósito de la presente investigación ha sido investigar las opiniones de aprendices en las clases de ELE en Suecia en cuanto a la corrección de su producción oral. La investigación se ha desempeñado por un método cuantitativo, por dos encuestas, dirigidas al alumnado del bachillerato al igual que al profesorado de estas clases. Las encuestas contienen las mismas preguntas, pero el enfoque de ambos está en el punto de vista de los aprendices, con el fin de poder comparar las respuestas. Las preguntas tratan de cómo evalúan su propio español, qué método de corrección prefieren, por qué prefieren un método a otro y si sus profesores usan su método preferido. Además, se ha usado Fisher’s exact test con el objetivo de ver si existe alguna correlación entre las variables motivación o competencia y la preferencia por alguna metodología de corrección. El resultado ha revelado que el método más preferido del alumnado es “Las claves metalingüísticas”, es decir, un método en el cual el profesorado da claves metalingüísticas a los estudiantes, para ayudarles a corregirse (Loewen,2007) y la razón más importante por la cual prefiere un método a otro es que quiere saber por qué lo que ha dicho está malo, no sólo que está malo. Las opiniones del alumnado y del profesorado no coinciden en cuanto a qué método prefiere el alumnado, no obstante, sí coinciden en la razón por la cual se prefiere una metodología de corrección a otra. Además, ambos el alumnadoy el profesorado piensan que el profesorado usa el método preferido del alumnado casi siempre. La prueba Fisher’s exact test ha develado que no existe ninguna correlación estadísticamente significativa entre las variables motivación o competencia y la preferencia por algún método de corrección. / Within the didactic theoretical framework there are several investigations on how students who study foreign languages should be corrected, but most investigations lack the perspective of the students, in other words, the recipient of the correction. Therefore, the aim of this study has been investigating the opinions of students regarding the correction of oral errors that the students produce in the classes of SSL (Spanish as a foreign language) in Sweden. The study has been carried out through a quantitative method, through two surveys, addressed to students in high school as well as the teachers of these classes. The surveys contain the same questions, however, the focus of both is on the point of view of the students, in order to be able to compare the answers.The questions involve how the students evaluate their own Spanish, which correction method they prefer, why they prefer a method over another and if their teachers use their preferred method. Furthermore, Fisher's exact test has been used to see if there exists any correlation between the variables motivation or competence and the preference for any of the correction methods. The result has revealed that the most preferred method is “Las claves metalingüísticas”, a method in which teachers give metalinguistic clues to students, to help them correct themselves (Loewen, 2007) and that the most important reason regarding why the students prefer a method is that they want to know why what they have said is incorrect, not only that it is incorrect. The opinions of the students and the teachers do not coincide regarding the method preferred by the students, however, they do regarding the reason why they prefer a method over another. Furthermore, both students and teachers think that the teachers use the student´s preferred method almost always. Fisher’s exact test has revealed that there does not exist any correlation between the variables motivation or competence and the preference for any of the correction methods.

Certificate Transparency provides auditability to the widely used X.509 Public Key Infrastructure (PKIX) authentication in Transport Layer Security (TLS) protocol. Transparency logs issue signed promises of inclusions to be used together with certificates for authentication of TLS servers. Google Chrome enforces the use of Certificate Transparency for validation of Extended Validation (EV) certificates. This thesis proposes a methodology for asserting correct operation and presents a survey of active Logs. An experimental Monitor has been implemented as part of the thesis. Varying Log usage patterns and metadata about Log operation are presented, and Logs are categorized based on characteristics and usage. A case of mis-issuance by Symantec is presented to show the effectiveness of Certificate Transparency.

Sound source localization (SSL) is a broad field, with many important application areas. In outdoor environments SSL systems can, among other things, be used to increase citizens’ safety by detecting and locating abnormal sounds such as gunshots or screams. Localization is a complex field, in the case of an outdoor setting, the sound signal is affected by weather conditions, noise, and objects blocking the propagation path. Furthermore, challenges concerning implementing cost-effective algorithms, robustness, accuracy, and balancing trade-offs, still remain. SSL is a field of intense research, and new studies are continuously published. However, to the best of the authors knowledge, there are no recent reviews of state of the art SSL solutions, applicable in an outdoor urban setting. Hence, this study provides a knowledge base concerning current SSL approaches, intended for the aforesaid environment, and to this end a systematic literature review was performed. The review consisted of a total of 43 studies, published between 2017-2021. From the extracted data, a taxonomy of currently seen design principles was developed. Additionally, both the applied measurement techniques and the positioning methods were defined. It can be seen from the result that classical methods such as direction of arrival and time difference of arrival still are the most used principles in research. However, learning-based approaches have seemingly started to attract more attention. Furthermore, a general description of the SSL approaches has been presented. Thus, the knowledge base provided by this study contains both information on what current state of the art techniques are most commonly adopted as well as the basic ideas behind these principles.

Selected emulsifiers, enzymes, and a fat substitute were incorporated into a standard muffin recipe, and their effects were compared to a full fat counterpart. Physical and sensory data were reported at the 0.01 significance level. Physical tests indicated no significant differences (p>0.01) among crust “L” and “b” values, specific gravity, water activity, and staling rate after 48 hours storage. The control muffin had a significantly (p<0.01) more yellow crumb, was significantly (p<0.01) less firm, and contained less moisture (p<0.01). The versions containing SSL and DATEM were less firm (p<0.01) and retained slightly more moisture (p<0.01) than the other reduced fat muffins. The control muffins and the versions containing SSL and DATEM were significantly (p<0.01) greater in volume than the other reduced fat muffins. Fat and DATEM were found to prolong retrogradation at a significantly (p<0.01) slower rate than in the other versions after 24 hours storage. Sensory results indicated no significant differences (p>0.01) in perceived adhesiveness. The muffins containing only the fat substitute and enzymes were rated with a significantly (p<0.01) darker crust color and (p<0.01) aftertaste than the other versions. The control muffin was significantly (p<0.01) moister, and contained a larger crumb (p<0.01) than the other versions. The control muffin was significantly (p<0.01) less cohesive. The results obtained from the data indicated that there were similarities and differences between the reduced fat versions and the control. / Master of Science