TY - JOUR A1 - Perlitz, Volker A1 - Lambertz, Manfred A1 - Cotuk, Birol A1 - Grebe, Reinhard A1 - Vandenhouten, Ralf A1 - Flatten, Guido A1 - Petzold, Ernst Richard A1 - Schmid-Schönbein, Holger A1 - Langhorst, Peter T1 - Cardiovascular rhythms in the 0.15-Hz band: common origin of identical phenomena in man and dog in the reticular formation of the brain stem? JF - Pflügers Archiv: European Journal of Physiology N2 - Selected examples from experiments in humans and dogs with time series of reticular neurons, respiration, arterial blood pressure and cutaneous forehead blood content fluctuations were analysed using multiscaled time-frequency distribution, post-event-scan and pointwise transinformation. We found in both experiments a “0.15-Hz rhythm” exhibiting periods of spindle waves (increasing and decreasing amplitudes), phase synchronized with respiration at 1:2 and 1:1 integer number ratios. At times of wave-epochs and n:m phase synchronization, the 0.15-Hz rhythm appeared in heart rate and arterial blood pressure. As phase synchronization of the 0.15-Hz rhythm with respiration was established at a 1:1 integer number ratio, all cardiovascular-respiratory oscillations were synchronized at 0.15 Hz. Analysis of a canine experiment supplied evidence that the emergence of the 0.15-Hz rhythm and n:m phase synchronization appears to result from a decline in the level of the general activity of the organism associated with a decline in the level of activity of reticular neurons in the lower brainstem network. These findings corroborate the notion of the 0.15-Hz rhythm as a marker of the “trophotropic mode of operation” first introduced by W.R. Hess. KW - vegetative rhythm KW - cardiovascular-respiratory coordination KW - n:m phase synchronization KW - autogenic training KW - lower brainstem dynamics KW - non-linear analysis Y1 - 2004 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9348 SN - 1432-2013 VL - 448 IS - 6 ER - TY - GEN A1 - Schmalenberg, Falko A1 - Vandenhouten, Ralf T1 - A DFD Based Approach to Model Data Processing Solutions T2 - Wissenschaftliche Beiträge 2016 N2 - This paper introduces procedures, which facilitate the development of as well as the linking between modular data processing processes into different and versatile system solutions. Based on the concept of data flow diagrams (Yourdon 1989), processes and data flows are used. With the ability of a process to harness any amount of in- and outputs with different sources and destinations, it is possible to model any conceivable data processing problem. By aggregating a diagram as a new process, it becomes possible to outsource partial process chains to different abstraction levels. As a result, even very complex solutions can be modeled and explained in a clear way. The introduced uniform termination flow while traversing the graph creates a good readability, which also makes it possible to quickly detect weaknesses. Moreover, this solution is comprehensive and advances the cooperation in teams and development. N2 - In diesem Beitrag wird ein Verfahren vorgestellt, welches die Entwicklung und Verknüpfung modularer Datenverarbeitungsprozesse zu beliebigen, unterschiedlichen Gesamtlösungen ermöglicht. Aufbauend auf dem Konzept der Datenflussdiagramme (Yourdon 1989) kommen Prozesse und Datenströme zum Einsatz. Dabei kann ein Prozess beliebig viele Inputs und Outputs mit unterschiedlichen Quellen und Senken haben und jedes denkbare Datenverarbeitungsproblem modelliert werden. Durch das verschachtelte Modellieren dieser Diagramme und deren Aggregation zu neuen Prozessen können Teilprozessketten auf unterschiedlichen Abstraktionsebenen ausgelagert werden. So lassen sich auch äußerst komplexe Lösungen übersichtlich modellieren, darstellen und erklären. Eine einheitliche Ablaufregel bei der Traversierung macht dieses Verfahren gut lesbar und lässt gegebenenfalls vorhandene Schwachstellen schnell erkennen. Zudem ist es verständlich und fördert die Zusammenarbeit sowie die gemeinsame Entwicklung. Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-5314 SN - 0949-8214 VL - 20 SP - 31 EP - 36 ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Lambertz, Manfred A1 - Langhorst, Peter A1 - Grebe, Reinhard T1 - Nonstationary time-series analysis applied to investigation of brainstem system dynamics JF - IEEE Transactions on Biomedical Engineering (T-BME) N2 - Previous investigations of the dynamic organization of the lower brainstem and its relation to peripheral and other central nervous systems were predominantly performed by linear methods. These are based on time-averaging algorithms, which merely can be applied to stationary signal intervals. Thus, the current concept of the common brainstem system (CBS) in the reticular formation (RF) of the lower brainstem and basic types of its functional organization have been developed. Here, the authors present experiments where neuronal activities of the RF and the nucleus tractus solitarii (NTS, first relay station of baroreceptor afferents) were recorded together with related parameters of electroencephalogram (EEG), respiration, and cardiovascular system. The RF neurons are part of the CBS, which participates in regulation and coordination of cardiovascular, respiratory, and motor systems, and vigilance. The physiological time series, thus acquired, yield information about the internal dynamic coordination of the participating regulation processes. The major problem in evaluating these data is the nonlinearity and nonstationarity of the signals. The authors used a set of especially designed time resolving methods to evaluate nonlinear dynamic couplings in the interaction between CBS neurons and cardiovascular signals, respiration and the EEG, and between NTS neurons (influenced by baroreceptor afferents) and CBS neurons. KW - time series analysis KW - neuron KW - radio frequency KW - electroencephalography KW - cardiology KW - central nervous system KW - relay KW - cardiovascular system KW - nonlinear dynamical system KW - design methodology Y1 - 2000 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9337 SN - 1558-2531 VL - 47 IS - 6 SP - 729 EP - 737 ER - TY - CHAP A1 - Mietzner, Dana A1 - Vandenhouten, Ralf A1 - Hartmann, Frank ED - Tambouris, Efthimios T1 - Collaborative Problem Solving for Regional Development? – A New Approach of Public Participation T2 - Electronic Government and Electronic Participation N2 - In this paper, we present a concept prototype for a socio-technical assistant (s.TAS) as a collaborative problem-solving approach to support the regional development in a selected rural district. The presented concept considers insides from citizen participation as an open government instrument and strongly incorporates collaborative value creation to address regional development issues. The presented approach incorporates citizens and other regional stakeholders (e.g., companies, organizations, associations) as problem-solvers and strongly enables regional stakeholders and the public administration to develop solutions jointly as an ongoing learning process. In this sense, s.TAS addresses participation approaches and elaborates participation to collaboration. For the development of this participatory problem-solving approach, we conducted (1) a broad literature review on participatory approaches and (2) we implemented a qualitative, collaborative research approach with participants from different stakeholder groups. In several workshop rounds, supported by interviews and surveys we developed a concept prototype for the socio-technical assistant s.TAS, which is a technical, smart system, which supports information, communication, participation and collaboration in the selected region. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9177 SN - 978-1-61499-570-8 SP - 19 EP - 26 PB - IOS Press CY - Amsterdam ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Wendlandt, Ole T1 - High-precision Optical Position Measurement in Indoor Environments BT - A method for locating people by capturing multiple optical markers with a mobile device JF - Optik & Photonik N2 - Indoor localization is still a challenge today. Conventional methods based on satellite navigation, like GPS, can only be used outdoors. On the other hand, radio signal architectures, like WiFi or NFC, require high cost infrastructure to be installed inside the building. In collaboration with Ixellence GmbH, the research group for telematics of the University of Applied Science Wildau is developing a new inexpensive solution based on the camera of a mobile device. This approach only requires the availability of multiple identifiable landmarks that can be installed cost-efficiently in an indoor environment. Our investigations show that this method is very accurate and can produce repeatable, robust results. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9305 SN - 1863-1460 VL - 10 IS - 3 SP - 24 EP - 27 ER - TY - JOUR A1 - Vandenhouten, Ralf A1 - Selz, Miriam A1 - Doktor, Michael T1 - Werkzeuge für die gezielte Parodontalbetreuung mit individueller Risikoanalyse JF - PN Parodontologie Nachrichten N2 - Mit neuer Methode lässt sich die Wahrscheinlichkeit einer fortschreitenden Parodontitis abschätzen. Y1 - 2005 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9355 UR - https://media.zwp-online.info/archiv/pub/sim/pn/2005/pn0205/pn0205_08_selz_dexcel.pdf SN - 1613-7191 VL - 2005 IS - 2 ER - TY - CHAP A1 - Metzler, Volker H. A1 - Vandenhouten, Ralf A1 - Krone, Jörg A1 - Grebe, Reinhard T1 - Unsupervised image segementation by stochastic reconstruction T2 - Proceedings of SPIE N2 - To segment complex and versatile image data from different modalities it is almost impossible to achieve satisfying results without the consideration of contextual information. In this approach, image segmentation is regarded as a high- dimensional optimization task, that can be solved by stochastical methods like evolutionary algorithms (EA). Initially, the iterative algorithm is provided with a set of good-quality sample segmentations. An efficient EA-based learning strategy generates a segmentation for a given target image from the provided samples. This two-level process consists of a global image-based optimization whose convergence is enhanced by locally operating pixel-based Boltzmann processes which restrict the search space to reasonable subsets. The stochastic reconstruction extracts the relevant information from the samples in order to adapt it onto the current segmentation problem, which results in a consistent labeling for the target image. The algorithm works unsupervised, because the range of possible labels and their contextual interpretation is provided implicitly by the sample segmentations. To prove the usefulness of the method experimental results based on both, reproducible phantom images and physiological NMR scans are presented. Moreover, an analysis of the basic segmentation and convergence properties is provided. Y1 - 1998 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-9329 SN - 1996-756X VL - 3338 ER -