Browsing by Author "Demirci, Ufuk."

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    An internet based system for monitoring patients and relatives' satisfaction rates in health services
    (Thesis (M.S.)-Bogazici University. Institute of Biomedical Engineering, 2008., 2008.) Demirci, Ufuk.; Güveniş, Albert.
    The aim of the study is to develop an internet based dashboard system for monitoring health key performance indicators (KPI) to improve medical services quality with a benchmarking framework. The study implements "patients and patient relatives' satisfaction rates" of organizations and institutions as a sample KPI. Enterprise Digital Dashboard (EDD) is an effective tool for executives to get a top level view of their corporate. Dashboard systems gather and display KPIs in a centralized system for supporting quality improvement processes. The Ministry of Health of Turkey collects and measures several KPI's in order to improve quality and performance in health-care services. 'Patients and patients relatives' satisfaction rate is one of these KPI's. In this study, we implemented an internet based system for replacing the currently applied paper-based patient satisfaction survey. The collected answers can be measured, benchmarked between hospitals or different departments of the same hospital, and monitored in various dimensions. Our solution has three sub-systems; first system collects survey answers through web forms, second system publishes the survey result as web services, and the last system displays the received KPI values from web services in a dashboard. The new system performs monitoring in various dimensions and benchmarking because the information is stored in a relational database. In current system, only the average satisfaction rate of a hospital is calculated and there is no benchmarking performed on the results. The benchmarking capability of the new solution provides the effective use of the KPI's in quality and performance improvement.|Keywords: key performance indicator (KPI), enterprise digital dashboard (EDD), benchmarking, knowledge management (KM), balanced scorecard (BSC)
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    Reconfiguring sliding-mode controller for underwater vehicles
    (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2004., 2004.) Demirci, Ufuk.; Özçaldıran, Kadri.; Kerestecioğlu, Feza,
    The challenging control problem of underwater vehicles is addressed in this study under excessive sea wave disturbances at shallow submerged operation. The systems are becoming more and more complex with the effect of rapid technological developments. These complex systems require fault tolerant control systems in order to accommodate with the uncertainties caused by faults or environmental changes. In this doctoral dissertation, a novel re-configuring controller is proposed based on sliding mode methodology for fault or disturbance tolerant control. Re-configuring control with sliding mode technique annuls the unwanted effects of system uncertainties caused by faults and environmental effects and avoids the chattering by increasing the robustness of the controller when it is necessary. As a result acceptable performance is obtained in case of system uncertainties and the chattering phenomenon is eliminated for the nominal system situation.