Herzog, Otthein
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Herzog, Otthein
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Herzog, Otthein
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Item-typ:Veröffentlichung, Konzeptbasierte Argumentation in dynamischen Umgebungen(2010-09-24); ; ; Argumentation systems play an important role when controversial points of views are to be considered in order to make decisions on inconsistent data. In this work a scalable framework for argumentation and decision support is outlined. This framework defines basic arguments and conflicts which refer to conceptual descriptions of the given state of affairs. Based on their meaning and preference relations that adopt specific viewpoints, it is possible to determine efficiently successful explanations depending on these viewpoints. We investigate our approach by examining soccer games, since many observed spatiotemporal behaviours in soccer can be interpreted differently.Dissertation400 381 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Negotiations for agent-based concurrent process scheduling of resources in highly dynamic environments(2021-10-15); ; ; An important and complex process in the mining industry is the material handling process. In this process, trucks must transport materials extracted by shovels to different places at the mine. To enable efficient material handling processes, the decision on the destination of a truck is crucial. Currently, this process is supported by an approach based on centralized systems that apply dispatching criteria. A disadvantage of this approach is not providing a precise dispatching solution because of missing knowledge about potentially changed external conditions and the dependency on a central node. This thesis addresses the improvement of the material handling process in an open-pit mine by utilizing a multiagent system. A multiagent system is a distributed system compound of intelligent agents that have to interact with each other to achieve their own objectives. Besides, they can react to dynamic changes both caused by the environment and in the equipment respective states. The thesis investigates how a multiagent approach can improve the material handling process in an open-pit mine specifically, how agents can negotiate efficiently to organize the activities of the equipment in a dynamic environment. The research is focused on the following three major research questions: 1. How can a material handling process in an open-pit mine be supported more efficiently? 2. Which communication and interaction mechanism among agents allows for generating schedules? 3. How can an agent make an efficient decision during concurrent negotiations in dynamic environments? The developed multiagent system is evaluated by comparing it against other centralized methods. In the evaluation, simulated scenarios based on actual data from a Chilean open-pit mine were used. The results show that the multiagent systems solve the truck dispatching problem in open-pit mines efficiently.Dissertation408 332 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Sensing and Visualizing Social Context from Spatial Proximity(2011-12-02); ; ; The concept of pervasive computing, as introduced by Marc Weiser under the name ubiquitous computing in the early 90s, spurred research into various kinds of context-aware systems and applications. There is a wide range of contextual parameters, including location, time, temperature, devices and people in proximity, which have been part of the initial ideas about context-aware computing. While locational context is already a well understood concept, social context---based on the people around us---proves to be harder to grasp and to operationalize. This work continues the line of research into social context, which is based on the proximity and meeting patterns of people in the physical space. It takes this research out of the lab and out of well controlled situations into our urban environments, which are full of ambiguity and opportunities. The key to this research is the tool that caused dramatic change in individual and collective behavior during the last 20 years and which is a manifestation of many of the ideas of the pervasive computing paradigm: the mobile phone. In this work, the mobile is regarded as a proxy for people. Through it, the social environment becomes accessible to digital measurement and processing. To understand the large amount of data that now becomes available to automatic measurement, we will turn to the discipline of social network analysis. It provides powerful methods, that are able to condense data and extract relevant meaning. Visualization helps to understand and interpret the results. This thesis contains a number of experiments, that demonstrate how the automatic measurement of social proximity data through Bluetooth can be used to measure variables of personal behavior, group behavior and the behavior of groups in relation to places. The principal contributions are: * A methodology to visualize personal social context by using an ego proximity network. Specific episodes can be localized and compared. * method to compare different days in terms of social context, e.g. to support automatic diary applications. * A method to compose social geographic maps. Locations of similar social context are detected and combined. * Functions to measure short-term changes in social activity, based on the distinction between strange and familiar devices. * The characterization of Bluetooth inquiries for social proximity sensing. * A dataset of Bluetooth sightings from an ego perspective in seven different settings. Additionally, some settings feature multiple stationary scanners and Cell-ID measurements. * Soft- and hardware to capture, collect, store and analyze Bluetooth proximity data.Dissertation402 107