Wikis are a popular collaboration technology. They support the collaborative editing of web pages through a simple mark-up language. Mobile devices are becoming ubiquitous, powerful and affordable. Thus it is advantageous for people to get the benefits of wikis in a mobile setting. However, mobile computing leads to its own challenges such as limited screen size, bandwidth, memory and battery life; they also have intermittent connectivity due to the mobility and the coverage of network. I investigate how wikis can be made mobile; that is how wiki forms of collaborative editing can be achieved through mobile devices such as PDAs and smart phones. A prototype mobile wiki has been created using .NET, which addresses these issues and enables simple collaborative working whilst on and offline through smart mobile devices. A cut down wiki runs on the mobile device. This communicates with a main central wiki to cache pages for off line use. When sitting in a powered cradle eager, downloading and synchronization of pages is supported. During mobile operation, pages are cached lazily on demand to minimize power use and to save the limited and expensive bandwidth. On re-connection, offline edited as well as new pages are synchronized with the main wiki server. Finally a pluggable page rendering engine enables pages to be rendered in different ways to suit different sized screens.

Il est maintenant avéré que les contaminants présents dans les milieux aquatiques peuvent être toxiques à l’état de traces voire d’ultra traces. Il est donc important de développer des méthodes d’analyse performantes et sensibles pouvant atteindre ces niveaux de concentration. Dans cette optique, les techniques chromatographiques couplées à la spectrométrie de masse (GC-MS et LC-MS/MS) sont généralement utilisées pour l’analyse des polluants organiques. Les composés présents dans les milieux aquatiques possèdent des propriétés physico-chimiques très variées, d’apolaires à très polaires. Ainsi, développer une analyse simultanée pour toutes ces molécules représente un challenge analytique. Dans ce travail de thèse, plusieurs étapes du processus analytique ont été évaluées : la préparation de l’échantillon par extraction sur phase solide (SPE), la séparation par chromatographie et la détection par spectrométrie de masse. Une liste de composés modèles couramment retrouvés dans les milieux aquatiques a été établie pour conduire ces essais. Les méthodes d’extraction en phase solide hors ligne et en ligne ont été développées dans une optique d’analyse multirésidus à un niveau de traces. Les méthodes chromatographiques, gazeuse et liquide, couplées à la spectrométrie de masse ont été étudiées pour favoriser une analyse exhaustive et sensible. La dernière partie a consisté à appliquer les méthodes développées pour une approche d’analyse non ciblée. / It is now widely recognized that contaminants present in aquatic environments can be toxic at traces or even ultra-traces level. Therefore, it is important to develop efficient and sensitive analytical methods to reach these levels of concentration. In that respect, chromatographic techniques coupled to mass spectrometry (GC-MS and LC-MS / MS) are commonly used for the analysis of organic pollutants. The substances encountered in aquatic environments display a large range of physico-chemical properties, from apolar to very polar. Thus, developing a simultaneous analysis for all these molecules represents an analytical challenge. In this pHD work, several steps of the analytical process have been investigated: sample preparation by solid phase extraction (SPE), chromatographic separation and the detection by mass spectrometry. A list of model compounds commonly determined in aquatic environments was established to conduct the tests. Solid phase extraction methods, offline and online, were developed in a multiresidue analysis aim at traces level. Chromatographic methods, gaseous and liquid, coupled to mass spectrometry were studied to obtain an exhaustive and sensitive analysis. The last part consisted to apply the developed methods for a non-targeted analysis approach.

Software systems in the automotive domain are generally safety critical and subject to strict timing requirements. Systems of this character are often constructed utilizing periodically executed tasks, that have a hard deadline. In addition, these systems may have additional deadlines that can be specified on cause-effect chains, or simply task chains. They are defined by existing tasks in the system, hence the chains are not stand alone additions to the system. Each chain provide an end-to-end timing constraint targeting the propagation of data through the chain of tasks. These constraints specify the additional timing requirements that need to be fulfilled, when searching for a valid schedule. In this thesis, an offline non-preemptive scheduling method is presented, designed for single core systems. The scheduling problem is defined and formulated utilizing Constraint Programming. In addition, to ensure that end-to-end timing requirements are met, job-level dependencies are considered during the schedule generation. Utilizing this approach can guarantee that individual task periods along with end-to-end timing requirements are always met, if a schedule exists. The results show a good increase in schedulability ratio when utilizing job-level dependencies compared to the case where job-level dependencies are not specified. When the system utilization increases this improvement is even greater. Depending on the system size and complexity the improvement can vary, but in many cases it is more than double. The scheduling generation is also performed within a reasonable time frame. This would be a good benefit during the development process of a system, since it allows fast verification when changes are made to the system. Further, the thesis provide an overview of the entire process, starting from a system model and ending at a fully functional schedule executing on a hardware platform.

The aim of this master thesis is to is to present the company P&P Jewelry Ltd., it's activities and to describe the current way of building brand Lilien Czech Jewelry, as well as an analysis of key markets and on the basis of the results to draft a new strategy of brand building. The first theoretical chapter deals with the specifics of brand building in the offline and online environments. The next part contents presents the company P&P Jewelry Ltd., it's project Lilien Czech Jewelry and markets on which the jewelery is exported. The following chapter focuses on the analysis of the competitiveness of the brand on the most important markets for by using the PEST analysis and the Porter's five forces model. The fourth part analyzes contemporary brand building strategy of the brand Lilien Czech Jewelry. In conclusion of this thesis is analysis of research of customers perception of the brand.

Online/offline signature schemes are useful in many situations, and two such scenarios are considered in this dissertation: bursty server authentication and embedded device authentication. In this dissertation, new techniques for online/offline signing are introduced, those are applied in a variety of ways for creating online/offline signature schemes, and five different online/offline signature schemes that are proved secure under a variety of models and assumptions are proposed. Two of the proposed five schemes have the best offline or best online performance of any currently known technique, and are particularly well-suited for the scenarios that are considered in this dissertation. To determine if the proposed schemes provide the expected practical improvements, a series of experiments were conducted comparing the proposed schemes with each other and with other state-of-the-art schemes in this area, both on a desktop class computer, and under AVR Studio, a simulation platform for an 8-bit processor that is popular for embedded systems. Under AVR Studio, the proposed SGE scheme using a typical key size for the embedded device authentication scenario, can complete the offline phase in about 24 seconds and then produce a signature (the online phase) in 15 milliseconds, which is the best offline performance of any known signature scheme that has been proven secure in the standard model. In the tests on a desktop class computer, the proposed SGS scheme, which has the best online performance and is designed for the bursty server authentication scenario, generated 469,109 signatures per second, and the Schnorr scheme (the next best scheme in terms of online performance) generated only 223,548 signatures. The experimental results demonstrate that the SGE and SGS schemes are the most efficient techniques for embedded device authentication and bursty server authentication, respectively.

La evaluación parcial (EP) de programas es una técnica formal para la especialización y optimización de programas. Un evaluador parcial toma un programa y sólo una parte de sus datos de entrada (los llamados datos estáticos) e intenta llevar a cabo todas las computaciones que sean posibles a partir de tales datos. El evaluador parcial devuelve un programa nuevo, denominado programa residual el cual se ejecuta generalmente de manera más e ciente que el programa original, ya que las computaciones que dependen de los datos estáticos se han realizado en la fase de evaluación parcial de una vez y para siempre [JGS93]. La evaluación parcial es una técnica de optimización de programas basada en semántica la cual ha sido investigada dentro de diferentes paradigmas de programación y aplicada a una amplia variedad de lenguajes. También es conocida como una técnica de transformación de programas fuente-a-fuente para especializar programas con respecto a una parte de sus datos de entrada (por ello también es conocida como especialización de programas). La evaluación parcial ha sido intensamente aplicada en el área de la programación funcional [CD93, JGS93, Tur86] y en programaci ón lógica [Gal93, Kom82b, LS91, PP94], donde ésta es normalmente conocida como deducción parcial. También en lenguajes imperativos como C en [TBC+98], o aplicada a un subconjunto importante de C en [And92] donde reportan la primera implementación autoaplicable de evaluación parcial para un lenguaje imperativo. Y en lenguajes formales como Scheme en [Jør92a, Jør92b] donde generan compiladores a partir de intérpretes. Cuando tenemos un programa sólo con algunos de sus datos de entrada conocidos no podemos ejecutar el programa, sin embargo podemos optimizar el programa computando respuestas tanto como sea posible. La evaluación parcial es una técnica que permite la ejecución parcial de un programa [MS97]. / Arroyo Delgado, G. (2012). Evaluación Parcial Offline Dirigida por Narrowing: Técnicas de Optimización y Aplicaciones [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/17655 / Palancia

La presente investigación tiene como propósito encontrar la relación entre las promociones online a través de Instagram, Facebook y mailing en su relación con la intención de compra en el entorno offline. Para ello, se realizó un análisis mixto de carácter cualitativo y cuantitativo. Con respecto al análisis cualitativo, se realizaron entrevistas a expertos y un focus group al target. También se realizó un análisis cuantitativo bivariado a través de correlaciones mediante encuestas a 150 mujeres jóvenes entre 18 a 24 años, los datos fueron procesados utilizando un análisis de correlaciones. Como resultado se obtuvo que existe una relación más fuerte entre Instagram y la intención de compra y, en el caso de Facebook esta es más débil. Con respecto a la plataforma mailing se encontró que no existe relación con la intención de compra. Dichos resultados son de utilidad para el sector estudiado debido a que se ha podido conocer la opinión sobre qué tipo de red social es la más utilizada. De esta forma, las empresas deberían de comunicar sólo en redes sociales como Facebook e Instagram y descartar otras herramientas que son secundarias para el target, porque aparentemente las mujeres jóvenes no esperan este tipo de información como son las promociones de venta vía mailing. / The purpose of this research is to find the relationship between online promotions through Instagram, Facebook and mailing in relation to the purchase intention in the offline environment. For this, a mixed analysis of qualitative and quantitative character was carried out. With respect to the qualitative analysis, expert interviews and a focus group were conducted on the target. A bivariate quantitative analysis was also carried out through correlations through surveys to 150 young women between 18 and 24 years old, the results were analyzed using correlation analysis. From this, it has been found that there is a stronger relationship on Instagram than on Facebook with the purchase intention, in the case of the mailing it was found that there is no relationship with the purchase intention. These results are useful for the sector studied because it has been possible to know the opinion on what type of social network is the most used. In this way, companies should only communicate on social networks such as Facebook and Instagram and discard other tools that are secondary to the target, because apparently young women do not expect this type of information such as sales promotions via mailing. / Trabajo de investigación

La aparición del ecommerce conlleva a las empresas a implementar estrategias omnicanales, para una mejor atención al consumidor conectado. Esto refiere que el servicio y su información se brinda en el canal online y offline, ambos se conectan e invitan a que exista una intención que culmine en compra. La relación entre el vendedor y el cliente es dinámica en este nuevo mecanismo de compra, ya que se busca que el consumidor tenga una mejor experiencia mediante el acceso a información sobre los productos o servicios en los que está interesado. De esta forma, ocurre un patrón denominado Webrooming el cual engloba la acción de investigar en el canal online sobre un bien y realizar un intercambio de canales, al efectuar la compra en el punto de venta físico. / Ecommerce leads companies to implement omnichannel strategies to give a better serve to the connected consumer. This is related that the service and its information is provided in the online and offline channel, both of which connect and invite an intention that culminates in purchase. The relationship between the seller and the customer is dynamic in this new purchasing mechanism, because it gives the opportunity for the consumer to have a better experience by accessing information about the products or services in which they are interested. In this way, there is a pattern called Webrooming, which encompasses the action of investigating an asset in the online channel and carrying out an exchange of channels, when making the purchase at the physical point of sale. / Trabajo de investigación

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BPL technology is quite widespread nowadays and the public is also somewhat aware of it. This technology can be used as a means of communication without the need to install additional media and thus use the existing infrastructure. In an effort to use the full potential of the technology, BPL communication began to be used to monitor the current state of cables in distribution networks online. Where the technology is already fully implemented, the distributor can use the data to evaluate the current situation. In this way, BPL technology can be used as a diagnostic tool to test the quality of a cable connection on which not only time but also humidity and other external influences could have a significant effect.