M.Ing. / Mobile adhoc networks (MANETs) are multihop wireless topologies that have rapidly changing node structure and limited connectivity. Since MANETs are not deployed on a wide scale, the research community still depends on the simulators such as the network simulator (Ns2) to evaluate MANET protocols. The topic of how to accurately model an indoor environment in the MANET research community is explored in this dissertation. We take an empirical and simulative approach to model our mobility pattern. Our mobility model is based on activity patterns drawn from the transport science. A comparison with the random way point is made in order to understand the weighty discrepancy between the two models. Our contribution in this research is three fold: 1. We argue that mobility modelling should be based on activities other than stochastic process that have got no realistic backing; 2. We model our network using by putting up an algorithm and take an empirical approach to model the radio frequency propagation. To show the difference of the two mobility models, the behaviour of the signal strength on the two mobility models is drawn; and 3. Finally an implementation of our mobility pattern and RF measurements in ns2 is done.

Aplicações que demandam uma sincronização entre usuários móveis requerem um mecanismo para a difusão (multicast) de mensagens entre dispositivos móveis. Em alguns casos, o multicast deve ser atômico, isto é, ou todos os elementos do grupo processam a mensagem difundida, ou nenhum deles. O AM2C é um protocolo para multicast atômico em Computação Móvel. Entretanto, o principal problema do AM2C é sua falta de escalabilidade, uma vez que este protocolo faz uma difusão para todas as estações-base na rede fixa. Esta dissertação descreve o projeto, implementação, simulação e avaliação dos protocolos AM2C e iAM2C, onde o segundo protocolo é uma variante escalável do primeiro. As implementações e simulações foram feitas usando o ambiente MobiCS - Mobile Computing Simulator, que é uma ferramenta para o teste e a análise de desempenho de protocolos distribuídos em redes móveis. A dissertação apresenta uma comparação detalhada dos protocolos para diferentes configurações de rede e diversos padrões de migração dos hosts móveis. / Applications that demand some synchronization among mobile users require a mechanism for reliable delivery of multicast messages to a group of mobile hosts. In some cases, the multicast must be atomic, i.e., either all or none of the mobile hosts accept each message. The AM2C is a protocol for atomic multicast in Mobile Computing. However, the main problem of AM2C is its lack of scalability, since it is based on broadcasts to all base stations in the fixed network. This work describes the project, implementation, simulation and evaluation of the protocols AM2C and iAM2C, where the second protocol is a scalable variant of the first. The implementations and simulations were performed using MobiCS - Mobile Computing Simulator, that is a tool for testing and doing performance analysis of distributed protocols in mobile networks. This work presents a detailed comparison of the protocols for different network configurations and various patterns of mobile hosts migrations.

The purpose of this paper is to explore the feasibility of using the mobile computer classroom for increasing the parental involvement via technology with the intent of alleviating both the problems of downward trending performance of students as well as bridging the "digital divide" among parents and other adults.

Ubiquitous computing aims to make computing widely available, easy to use, and completely transparent to the user. Umbilical Cord is intended to be the first step in researching ubiquitous computing at CSUSB. It implements a model scalable network with a client-server architecture that features consistent user interaction and global access to user data. It is based on the Linux operating system which can be leveraged for future research due to the open nature of its source code. It also features a scalable network swap.

The Tango Panopticon project merges art with technology to create a live and synchronous art experience which is just as much about the participants as it is about the observers. The goal of this project is to create a dialogue between observers of the event in the hopes of creating new social connections where there were none before. This goal is achieved by allowing observers to view the event from anywhere around the world on a computer via the internet and participate in a dialogue with other users on the website. The other objective of this project is to create a multimedia internet platform for other art projects to use. Other artists that are interested in hosting their own live synchronous event will be able to use the platform we have created and customize it to the specific needs of their project.

Wireless sensor networks (WSNs) have gained attention in recent years with the proliferation of the micro-electro-mechanical systems, which has led to the development of smart sensors. Smart sensors has brought WSNs under the spotlight and has created numerous different areas of research such as; energy consumption, convergence, network structures, deployment methods, time delay, and communication protocols. Convergence rates associated with information propagations of the networks will be questioned in this thesis. Mobility is an expensive process in terms of the associated energy costs. In a sensor network, mobility has significant overhead in terms of closing old connections and creating new connections as mobile sensor nodes move from one location to another. Despite these drawbacks, mobility helps a sensor network reach an agreement more quickly. Adding few mobile nodes to an otherwise static network will significantly improve the network’s ability to reach consensus. This paper shows the effect of the mobility on convergence rate of the wireless sensor networks, through Eigenvalue analysis, modeling and simulation.

abstract: The mobile crowdsensing (MCS) applications leverage the user data to derive useful information by data-driven evaluation of innovative user contexts and gathering of information at a high data rate. Such access to context-rich data can potentially enable computationally intensive crowd-sourcing applications such as tracking a missing person or capturing a highlight video of an event. Using snippets and pictures captured from multiple mobile phone cameras with specific contexts can improve the data acquired in such applications. These MCS applications require efficient processing and analysis to generate results in real time. A human user, mobile device and their interactions cause a change in context on the mobile device affecting the quality contextual data that is gathered. Usage of MCS data in real-time mobile applications is challenging due to the complex inter-relationship between: a) availability of context, context is available with the mobile phones and not with the cloud, b) cost of data transfer to remote cloud servers, both in terms of communication time and energy, and c) availability of local computational resources on the mobile phone, computation may lead to rapid battery drain or increased response time. The resource-constrained mobile devices need to offload some of their computation. This thesis proposes ContextAiDe an end-end architecture for data-driven distributed applications aware of human mobile interactions using Edge computing. Edge processing supports real-time applications by reducing communication costs. The goal is to optimize the quality and the cost of acquiring the data using a) modeling and prediction of mobile user contexts, b) efficient strategies of scheduling application tasks on heterogeneous devices including multi-core devices such as GPU c) power-aware scheduling of virtual machine (VM) applications in cloud infrastructure e.g. elastic VMs. ContextAiDe middleware is integrated into the mobile application via Android API. The evaluation consists of overheads and costs analysis in the scenario of ``perpetrator tracking" application on the cloud, fog servers, and mobile devices. LifeMap data sets containing actual sensor data traces from mobile devices are used to simulate the application run for large scale evaluation. / Dissertation/Thesis / Doctoral Dissertation Electrical Engineering 2019

This paper aims at giving answers to the question of how and why mobile device usage patterns differ in China, Germany and the United States of America. Triangulation was chosen as the appropriate research method: qualitative date from focus groups is complemented with quantitative date from an online questionnaire. Firstly, a short overview over past research results on psychological differences between people from different cultures is given. Then, qualitative data gathered in focus groups is presented. Quantitative data on mobile device usage patterns from an online questionnaire in the three countries is presented. About 300 questionnaires were completed and evaluated. Many statistically significant effects from the quasi-variable culture could be found. For example, although almost all participants from all three cultures use mobile devices for communication purposes, the usage frequencies of other functions differ strongly. Cultures differ also in the acceptance of autonomous interventions by a technical system. Probable explanations for these differences and their consequences on HMI design are discussed. / Diese Veröffentlichung soll die Frage beantworten, wie und warum sich die Nutzungsmuster von mobilen Endgeräten in China, Deutschland und den USA unterscheiden. Als angemessene Untersuchungsmethode wurde die Triangulation ausgewählt: Qualitative Daten aus Fokusgruppen werden ergänzt durch quantitative Daten aus einem Online-Fragebogen. Zuerst wird ein kurzer Überblick über bestehende Forschungsergebnisse über psychologische Unterschiede zwischen Menschen aus verschiedenen Kulturen gegeben. Anschließend werden qualitative Daten aus Fokusgruppen und quantitative Daten aus einem Online-Fragebogen über Nutzungsmuster von mobilen Endgeräten präsentiert. Mehr als 300 Fragebögen wurden ausgefüllt und ausgewertet. Viele statistisch signifikante Auswirkungen der Quasi-Variable Kultur konnten gefunden werden. Während beispielsweise fast alle Teilnehmer aus allen drei Kulturen mobile Endgeräte für Kommunikationszwecke nutzen, unterscheiden sich die Nutzungshäufigkeiten anderer Funktionen stark. Die Kulturen unterscheiden sich auch in der Akzeptanz von autonomen Eingriffen durch ein technisches System. Mögliche Erklärungen für diese Unterschiede und deren Folgen für die Gestaltung von Mensch-Maschine-Schnittstellen werden diskutiert.

When building information systems that can be accessed through desktop and mobile devices, developers often face the same basic design decisions that depend on a number of still unstructured criteria. Going through the whole decision-making process for every project is inefficient and error-prone, however, a comprehensive set of best practices has not yet been established. We therefore present the foundations of a classification scheme for mobile commerce systems that helps developers to categorize applications according to high-level requirements. After a discussion of the criteria, we suggest implications that can be drawn from it and present examples for their application.

Bei der Entwicklung von mobilen Informationssystemen stehen die Entwickler oft vor immer wiederkehrenden Entwurfsentscheidungen, die von einer Anzahl noch unstrukturierter Kriterien abhängen. Den kompletten Entscheidungsprozess für jedes einzelne Projekt von vorne bis hinten zu durchlaufen ist ineffizient und fehleranfällig, trotzdem gibt es noch keine umfassende Sammlung von „Best Practices“, die diesen Prozess verkürzen könnte. Wir präsentieren daher die Grundlagen eines Klassifikationsschemas für mobile Informationssysteme, das Entwicklern hilft, Anwendungen anhand von Anforderungen auf höherer Ebene zu klassifizieren und entsprechende Architekturentscheidungen zu treffen. Im Anschluss an die Diskussion der vorgestellten Kriterien schlagen wir Erweiterungen des Klassifikationsschemas und Folgerungen, die daraus gezogen werden können, vor.