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Background: An important factor in approaching the challenges of chronic diseases, requiring long-term management and high costs, is the active participation of the patient in the care process. Objectives: Facing the problem of lacking patient-tailored, comprehensive health management software, the aim of this thesis is to generate ideas for a graphical user interface (GUI) to support stroke patients in the management of their individual care process. The objectives are to prototype a GUI for a patient e-service and to evaluate its usefulness and usability with stroke patients. Methods: A scenario-based, user-centered design method was used to envision ideas for the user interface. Static prototypes were realized with the tool Pencil and for the implementation of a dynamic prototype web programming techniques were used. For the evaluation of the prototypes the methods of focus group discussion and cooperative evaluation were applied. Results: The situation of a representative stroke patient and his interaction with the e-service were described in scenarios. Graphical user interfaces of the involved system views were derived from the scenarios and illustrated with static wireframe prototypes. A welcome screen, a care process timeline overview, and a diary with data sharing functionality were designed. The diary functionality was further examined by implementing a prototypical web application. During the evaluation, feedback for further improvements was gathered, and assumptions about the user information and functionality needs could be verified. Conclusion: The developed prototypes represent a suitable graphical user interface and visualizations to support stroke patients in the management of their care process. An overview of appointments on the welcome screen, a diary to document and monitor health, a timeline overview of all time-related health information and a selected sharing functionality were found to be important features of a personal health system for stroke patients.
In this thesis a software system is proposed that provides transparent access to dynamically processed data using a synthetic filesystem for the data transfer as well as interaction with the processing pipeline. Within this context the architecture for such a software solution has been designed and implemented. Using this implementation various profiling measurements have been acquired in order to evaluate the applicability in different data processing scenarios. Usability aspects, considering the interaction with the processing pipeline, have been examined as well. The implemented software is able to generate the processing result on-the-fly without modification of the original input data. Access to the output data is provided by means of a common filesystem interface without the need of implementing yet another communication protocol. Within the processing pipeline the data can be accessed and modified independently from the actual input and output encoding. Currently the data can be modified using a C/C++, GLSL or Java front end. Profiling data has shown that the overhead induced by the filesystem is negligible for most usage patterns and is only critical for realtime processing with a high data throughput e. g. video processing at or above 30 frames per second where typically no file operations are involved.
Sudden cardiac arrest is a leading cause of death world wide, with about 100.000 to 150.000 cases each year in Germany alone [Weidringer and Sefrin, 2006]. This means that annually one out of 1000 citizens are affected [Bahr, 2007]. At standard conditions the human brain has a relative low ischemic1 tolerance. Therefore after 3 - 5 minutes without therapy, irreversible damage is to be expected. The rate of survival drops 7% - 10% each minute, without resuscitation [Bahr, 2007]. Since the arrival of the organized emergency medical service usually takes more than 5 minutes after the emergency call [Wahlen et al., 2003, Weisfeldt et al., 2010], the instant and adequate resuscitation by bystanders in this period is of vital importance. The advantage of basic life support2 (BLS) by laymen shows a fourfold higher rate of survival, once resuscitation has begun, until the arrival of the emergency medical service [Bahr, 2007].