Desenvolupament d'una aplicació Android per a Moodle

L'evolució que la tecnologia de les comunicacions sense fils ha experimentat en els darrers anys permet que avui en dia els dispositius mòbils proporcionin una resposta més que acceptable. Ja s'han superat molts dels problemes de mobilitat, d'infraestructura i d'ample de banda que fins ara dificultaven l'ús d'aquests dispositius. Aquest fet ha fomentat l'expansió de diferents sistemes dels que es pot destacar Android, iPhone OS i Windows Mobile/Windows Phone 7. Els dos primers són els que actualment es disputen el lideratge del mercat dels dispositius i aplicacions mòbils i és Android el que ha experimentat el major creixement els darrers anys. Paral·lelament, la constant introducció de programari d'e-learning destinat a activitats de formació no presencial basades en Internet ha permès arribar a milions d'usuaris en diferents àmbits, com ara universitats, empreses i institucions d'arreu del món. D'aquest conjunt de programari destaca Moodle, suite de codi obert que permet crear llocs web de formació en línia de forma senzilla i eficaç.Aquest Projecte de Final de Carrera, emmarcat en l'àrea de Xarxes de Computadors, conjugaaquests tres conceptes mitjançant el desenvolupament d'una aplicació per a dispositius mòbils Android que connecta a un servidor Moodle. La comunicació entre ells utilitza intensivament les xarxes sense fils i fa crides als serveis que aquest ofereix gràcies als Web Services, mètode de comunicacions composat d'un conjunt de protocols i de programari que permet la comunicació entre dos dispositius a través de la xarxa.

Aplicació per gestionar fàbriques de televisors

L'objectiu d'aquest projecte és l'anàlisi, disseny i la seva corresponent implementació d'una solució basada en programari per a poder gestionar un conjunt de fabriques de televisors i monitors en quan a la gestió de l'estoc d'escandall, la gestió de les OF's i la gestió dels FR.

National Alcohol Policy Ireland

The National Alcohol Policy is directed at reducing the prevalence of alcohol-related problems through an emphasis on moderation in alcohol consumption. The importance of a comprehensive alcohol policy was highlighted when Ireland endorsed the European Charter on Alcohol in December 1995 along with 48 other Member States of the WHO European Region. The alcohol-related problems are multidimensional, therefore the solutions most be multi-sectoral. This means that commitment to the National Alcohol Policy must be on the agenda of policy makers in all sectors and at all levels. An Alcohol Policy requires both environmental and individual strategies. There is strong evidence that policies which influence access to alcohol, control pricing through taxation and other public health measures, can have a positive impact on curtailing the health and social burden resulting from drinking (Edwards et al. 1994). However, a key to the effectiveness of such strategies is public support, enforcement and maintenance of the policies. In examining the rationale for a National Alcohol Policy a number of elements have been identified. Research is urgently required to identify attitudes and patterns of alcohol consumption across the population and within sub-groups of the population. Based on sound research, a sensible drinking message of Less is Better should form an educational empowerment programme with regional and local initiatives as a required and integral part of such a campaign. A health education programme in all schools should be part of the core curriculum. The availability and effectiveness of treatment services need to be established. Action to contain the availability of alcohol could be achieved by reducing the number of special exemptions for longer opening hours and controlling access to underage drinking by ID schemes nation-wide. The enforcement of drink driving legislation including random breath testing needs to be continued to reduce alcohol-related traffic accidents. All levels of the Drinks Industry should recognise that people have the right to be safeguarded from pressures to drink. Finally, a National Alcohol Policy could be co-ordinated by a wider National Substance Use Surveillance Unit.This resource was contributed by The National Documentation Centre on Drug Use.

myvideos : creació de repositoris de videos (Moodle)

Amb l'objectiu de fomentar l'ús de recursos audiovisuals, s'ha desenvolupat un bloc de Moodle que permet afegir vídeos codificant-los automàticament al format Flash Video, reduint així l'espai de disc i l'ample de banda necessaris per fer-ne ús. Cada usuari té el seu propi repositori i tots els vídeos afegits com a públics passen a formar part d'un repositori d'accés públic. La darrera versió del programari és disponible a: http://moodle.org/mod/data/view.php?d=13&rid=3977

Gestió de l'ample de banda en xarxes d'àmbit educatiu

En l'article s'analitza prèviament l'estat de l'art de la gestió de l'ample de banda en entorns educatius, presentant en base a diverses classificacions anteriors solucions i experiències proposades. Amb la proposta presentada, mitjançant els experiments de simulació efectuats i els tests en entorns reals es tracta de comprovar-ne el correcte comportament, demostrant la utilitat de la mateixa alhora de fer la gestió de l'ample de banda dels centres.

Multicast extension of unicast charging for QoS Services

In order to successfully deploy multicast services in QoS-aware networks, pricing architectures must take into account the particular characteristics of multicast sessions. With this objective, we propose a charging scheme for QoS multicast services, assuming that the unicast cost of each interconnecting link is determined and that such cost is expressed in terms of quality of service (QoS) parameters. Our scheme allows determining the cost distribution of a multicast session along a cost distribution tree (CDT), and basing such distribution in those pre-existing unicast cost functions. The paper discusses in detail the main characteristics of the problem in a realistic interdomain scenario and how the proposed scheme would contribute to its solution

A quality-based cost distribution charging scheme for QoS multicast networks

This paper presents a new charging scheme for cost distribution along a point-to-multipoint connection when destination nodes are responsible for the cost. The scheme focus on QoS considerations and a complete range of choices is presented. These choices go from a safe scheme for the network operator to a fair scheme to the customer. The in-between cases are also covered. Specific and general problems, like the incidence of users disconnecting dynamically is also discussed. The aim of this scheme is to encourage the users to disperse the resource demand instead of having a large number of direct connections to the source of the data, which would result in a higher than necessary bandwidth use from the source. This would benefit the overall performance of the network. The implementation of this task must balance between the necessity to offer a competitive service and the risk of not recovering such service cost for the network operator. Throughout this paper reference to multicast charging is made without making any reference to any specific category of service. The proposed scheme is also evaluated with the criteria set proposed in the European ATM charging project CANCAN

Minimum interference routing with fast protection

One of the most effective techniques offering QoS routing is minimum interference routing. However, it is complex in terms of computation time and is not oriented toward improving the network protection level. In order to include better levels of protection, new minimum interference routing algorithms are necessary. Minimizing the failure recovery time is also a complex process involving different failure recovery phases. Some of these phases depend completely on correct routing selection, such as minimizing the failure notification time. The level of protection also involves other aspects, such as the amount of resources used. In this case shared backup techniques should be considered. Therefore, minimum interference techniques should also be modified in order to include sharing resources for protection in their objectives. These aspects are reviewed and analyzed in this article, and a new proposal combining minimum interference with fast protection using shared segment backups is introduced. Results show that our proposed method improves both minimization of the request rejection ratio and the percentage of bandwidth allocated to backup paths in networks with low and medium protection requirements

Resource dimensioning aspect of heterogeneous traffic with different service requirements: Integration versus segregation

In this paper, we consider the ATM networks in which the virtual path concept is implemented. The question of how to multiplex two or more diverse traffic classes while providing different quality of service requirements is a very complicated open problem. Two distinct options are available: integration and segregation. In an integration approach all the traffic from different connections are multiplexed onto one VP. This implies that the most restrictive QOS requirements must be applied to all services. Therefore, link utilization will be decreased because unnecessarily stringent QOS is provided to all connections. With the segregation approach the problem can be much simplified if different types of traffic are separated by assigning a VP with dedicated resources (buffers and links). Therefore, resources may not be efficiently utilized because no sharing of bandwidth can take place across the VP. The probability that the bandwidth required by the accepted connections exceeds the capacity of the link is evaluated with the probability of congestion (PC). Since the PC can be expressed as the CLP, we shall simply carry out bandwidth allocation using the PC. We first focus on the influence of some parameters (CLP, bit rate and burstiness) on the capacity required by a VP supporting a single traffic class using the new convolution approach. Numerical results are presented both to compare the required capacity and to observe which conditions under each approach are preferred

Automatic self-configuration of the logical network using distributed software agents

We present a system for dynamic network resource configuration in environments with bandwidth reservation. The proposed system is completely distributed and automates the mechanisms for adapting the logical network to the offered load. The system is able to manage dynamically a logical network such as a virtual path network in ATM or a label switched path network in MPLS or GMPLS. The system design and implementation is based on a multi-agent system (MAS) which make the decisions of when and how to change a logical path. Despite the lack of a centralised global network view, results show that MAS manages the network resources effectively, reducing the connection blocking probability and, therefore, achieving better utilisation of network resources. We also include details of its architecture and implementation

All-Optical Label Stacking: Easing the Trade-offs Between Routing and Architecture Cost in All-Optical Packet Switching

All-optical label swapping (AOLS) forms a key technology towards the implementation of all-optical packet switching nodes (AOPS) for the future optical Internet. The capital expenditures of the deployment of AOLS increases with the size of the label spaces (i.e. the number of used labels), since a special optical device is needed for each recognized label on every node. Label space sizes are affected by the way in which demands are routed. For instance, while shortest-path routing leads to the usage of fewer labels but high link utilization, minimum interference routing leads to the opposite. This paper studies all-optical label stacking (AOLStack), which is an extension of the AOLS architecture. AOLStack aims at reducing label spaces while easing the compromise with link utilization. In this paper, an integer lineal program is proposed with the objective of analyzing the softening of the aforementioned trade-off due to AOLStack. Furthermore, a heuristic aiming at finding good solutions in polynomial-time is proposed as well. Simulation results show that AOLStack either a) reduces the label spaces with a low increase in the link utilization or, similarly, b) uses better the residual bandwidth to decrease the number of labels even more

Applications of stochastic analysis in finance and statistical inference

First: A continuous-time version of Kyle's model (Kyle 1985), known as the Back's model (Back 1992), of asset pricing with asymmetric information, is studied. A larger class of price processes and of noise traders' processes are studied. The price process, as in Kyle's model, is allowed to depend on the path of the market order. The process of the noise traders' is an inhomogeneous Lévy process. Solutions are found by the Hamilton-Jacobi-Bellman equations. With the insider being risk-neutral, the price pressure is constant, and there is no equilibirium in the presence of jumps. If the insider is risk-averse, there is no equilibirium in the presence of either jumps or drifts. Also, it is analised when the release time is unknown. A general relation is established between the problem of finding an equilibrium and of enlargement of filtrations. Random announcement time is random is also considered. In such a case the market is not fully efficient and there exists equilibrium if the sensitivity of prices with respect to the global demand is time decreasing according with the distribution of the random time. Second: Power variations. it is considered, the asymptotic behavior of the power variation of processes of the form _integral_0^t u(s-)dS(s), where S_ is an alpha-stable process with index of stability 0&alpha&2 and the integral is an Itô integral. Stable convergence of corresponding fluctuations is established. These results provide statistical tools to infer the process u from discrete observations. Third: A bond market is studied where short rates r(t) evolve as an integral of g(t-s)sigma(s) with respect to W(ds), where g and sigma are deterministic and W is the stochastic Wiener measure. Processes of this type are particular cases of ambit processes. These processes are in general not of the semimartingale kind.

Dipolo impreso para aplicaciones Wi-fi y caracterización de la ganancia por medio de la celda TEM

Este trabajo recoge el estudio, diseño, fabricación y análisis de dos dipolos de media onda para aplicaciones Wi-fi, con objeto de caracterizar sus respectivas ganancias mediante el uso de dos sistemas de medida distintos, el primero basado en el análisis del balance de enlace entre antenas mediante un analizador de redes y el segundo mediante una celda TEM. Para obtener un correcto funcionamiento de los dipolos, resulta de vital importancia conseguir un buen ajuste de las dimensiones de los mismos durante el desarrollo práctico del proyecto, consiguiendo una máxima transferencia de potencia y un ancho de banda suficientemente amplio para asegurar que las antenas presenten una buena adaptación en la banda de los 2.4 GHz – 2.5 GHz.

Nonparametric estimation of Value-at-Risk

A method to estimate an extreme quantile that requires no distributional assumptions is presented. The approach is based on transformed kernel estimation of the cumulative distribution function (cdf). The proposed method consists of a double transformation kernel estimation. We derive optimal bandwidth selection methods that have a direct expression for the smoothing parameter. The bandwidth can accommodate to the given quantile level. The procedure is useful for large data sets and improves quantile estimation compared to other methods in heavy tailed distributions. Implementation is straightforward and R programs are available.

CAC controlled services sharing a link with connectionless data services in an ATM network: a performance evaluation study

In the B-ISDN there is a provision for four classes of services, all of them supported by a single transport network (the ATM network). Three of these services, the connected oriented (CO) ones, permit connection access control (CAC) but the fourth, the connectionless oriented (CLO) one, does not. Therefore, when CLO service and CO services have to share the same ATM link, a conflict may arise. This is because a bandwidth allocation to obtain maximum statistical gain can damage the contracted ATM quality of service (QOS); and vice versa, in order to guarantee the contracted QOS, the statistical gain have to be sacrificed. The paper presents a performance evaluation study of the influence of the CLO service on a CO service (a circuit emulation service or a variable bit-rate service) when sharing the same link