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Institute
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Altbausanierung spielt in der Baupraxis eine immer wichtigere Rolle, während das Bauvolumen bei den Neubauten abnimmt. Diesem Trend wird im Studiengang Architektur der HTWG Konstanz durch neue Vorlesungen und Seminare vermehrt Rechnung getragen. So wurde im Sommersemester 2003 durch den Lehrbeauftragten Architekten Roger Karbe (Berlin) und Prof. Cengiz Dicleli (FH-Konstanz) das Seminar „Konstruktiver Denkmalschutz“ durchgeführt. Fünf denkmalgeschützte Bauten vom Weltrang, die bereits erfolgreich saniert, modernisiert und zum Teil umgenutzt worden sind, wurden unter konstruktiven und funktionalen Aspekten des Denkmalschutzes untersucht und analysiert. Diese sind der Hamburger Bahnhof, das Alte Museum, der Langhansbau im Schloss Charlottenburg, das Fährhaus auf der Pfaueninsel und Stülers Neues Museum, das zurzeit vom englischen Architekten David Chipperfield wieder hergestellt wird. Häufig werden Überlegungen zum Erhalt und Schutz historischer Bausubstanz zu wenig, zu spät oder gar nicht angestellt. Viele herausragende Gebäude sind deshalb bereits verloren gegangen. Die totale Konservierung historischer Anlagen bietet selten einen sinnvollen Lösungsansatz. Der Verzicht auf jede Veränderung schließt am Ende eine sinnvolle Nutzung aus. Entfallen oder Verändern sich die ursprünglich geplanten Nutzungen, so sollte vor jeder Aufgabe sorgfältig geprüft werden, wie weit bauliche Anlagen für neue Nutzungsanforderungen herangezogen werden können. Das Lehrziel beinhaltet die Einordnung der betreffenden Gebäude in das geschichtliche Umfeld. Danach wird das Hauptaugenmerk auf die konstruktiven Zusammenhänge gelenkt. Dabei werden möglichst alle Rahmenbedingungen erfasst: Grundstückswahl, Baugrund, Bauzeit, Baumaterialien, Baumethoden, technische Ausstattungen und Kostenrelevanz. Vertiefend folgen dann eine Erarbeitung der Wechselwirkung zu den ursprünglichen Nutzungen und die Hinlenkung zur Erkenntnis der speziellen Korrelation zwischen Konstruktion und Funktion auch bei den historischen Bauten. Die zukünftigen Architekten müssen auch lernen, sich und ihren schöpferischen Ansatz selbst kritisch zu hinterfragen. Erst das umfassende Wissen um die geschichtlichen wie kon-struktiven Zusammenhänge ermöglicht ihnen eine eigene Positionierung. Beim Erhalt historischer Gebäude durch einen möglichst schonenden Umgang mit vorhandener Substanz können gleichermaßen wirtschaftliche Interessen der Investoren wie auch die Forderungen des Denkmalschutzes befriedigt werden. Anhand der ausgewählten Bauwerke in Berlin, die alle unter Denkmalschutz stehen, konnten die Architekturstudenten verschiedene Ansätze von erfolgten Umnutzungen und den daraus folgenden Umbauten studieren. Die Bauten bieten einen Abriss der Bau- und Kulturgeschichte Preußens über einen Zeitraum von 100 Jahren vom Ende des 18. bis zum Ende des 19. Jahrhunderts.
Driver assistance systems are increasingly becoming part of the standard equipment of vehicles and thus contribute to road safety. However, as they become more widespread, the requirements for cost efficiency are also increasing, and so few and inexpensive sensors are used in these systems. Especially in challenging situations, this leads to the fact that target discrimination cannot be ensured which in turn leads to a false reaction of the driver assistance system. Typically, the interaction between moving traffic participants is not modeled directly in the environmental model so that tracked objects can split, merge or disappear. The Boids flocking algorithm is used to model the interaction between road users on already tracked objects by applying the movement rules (separation, cohesion, alignment) on the boids. This facilitates the creation of semantic neighborhood information between road users. We show in a comprehensive simulation that with only 7 boids per traffic participant, the estimated median separation between objects can improve from 2.4 m to 3 m for a ground truth of 3.7 m. The bottom percentile improves from 1.85 m to 2.8 m.
The process of restoring our body and brain from fatigue is directly depend-ing on the quality of sleep. It can be determined from the report of the sleep study results. Classification of sleep stages is the first step of this study and this includes the measurement of biovital data and its further processing.
In this work, the sleep analysis system is based on a hardware sensor net, namely a grid of 24 pressure sensors, supporting sleep phase recognition. In comparison to the leading standard, which is polysomnography, the proposed approach is a non-invasive system. It recognises respiration and body move-ment with only one type of low-cost pressure sensors forming a mesh archi-tecture. The nodes implement as a series of pressure sensors connected to a low-power and performant microcontroller. All nodes are connected via a system wide bus with address arbitration. The embedded processor is the mesh network endpoint that enables network configuration, storing and pre-processing of the data, external data access and visualization.
The system was tested by executing experiments recording the sleep of different healthy young subjects. The results obtained have indicated the po-tential to detect breathing rate and body movement. A major difference of this system in comparison to other approaches is the innovative way to place the sensors under the mattress. This characteristic facilitates the continuous using of the system without any influence on the common sleep process.
Das häusliche Umfeld kann vor allem für langfristiges Schlafmonitoring verwendet werden. Gute Patientenakzeptanz erfordert niedrige Nutzer- und Installationsbarrieren. Für die Installation zu Hause sind klassische PSG-Systeme aufgrund von ihrer Komplexität wenig passend. Ziel der Entwicklung ist die qualifizierte Erhebung von Parametern, die einerseits eine hinreichend gute Klassifikation von Schlafphasen erlauben und die andererseits durch nicht-invasive Methoden erfasst werden können.
Basierend auf einer Literaturstudie und der Maßgabe nicht-invasive Methoden zu nutzen, wurden folgende Parameter ausgewählt: Körperbewegung, Atmung und Herzschlag. Diese Parameter können nicht-invasiv durch Matratzendrucksensoren erfasst werden. Die Sensorknoten sind als ein Netz von Drucksensoren implementiert, die mit einem leistungsarmen und performanten Mikrocontroller verbunden sind. Alle Knoten sind über einen systemweiten Bus mit Adressarbitrierung verbunden. Der eingebettete Prozessor ist der Mesh-Netzwerk-Endpunkt, der die Netzwerkkonfiguration, Speicherung und Vorverarbeitung der Daten, externen Datenzugriff und Visualisierung ermöglicht.
Das System wurde getestet, indem Experimente durchgeführt wurden, die den Schlaf verschiedener gesunder junger Personen aufzeichneten. Die erhaltenen Ergebnisse bestätigen die Fähigkeit des Systems, Atemfrequenz und Körperbewegung zu erfassen. Ein wesentlicher Unterschied dieses Systems im Vergleich zu anderen Ansätzen ist die innovative Art, die Sensoren unter der Matratze zu platzieren. Diese Eigenschaft erleichtert die kontinuierliche Nutzung des Systems ohne Einfluss auf den gemeinsamen Schlafprozess.
Um Schlafverhalten langfristig zu untersuchen, wird ein Hardwaresystem mit niedrigen Installationsbarrieren für den Einsatz im häuslichen Umfeld. Erste Ergebnisse weisen auf das Potenzial hin, außer Körperbewegung und Atemfrequenz, auch Herzfrequenz erfassen zu können. Die Werte können weiter verbessert werden, wenn die Sensorabfragefrequenz erhöht wird. Nach der Weiterentwicklung des Systems, soll es mit dem Softwarealgorithmus für die Schlafphasenerkennung verbunden werden.
Sensorlose Positionsregelung eines hydraulischen Proportional-Wegeventils mittels Signalinjektion
(2017)
Es wird eine Methode zur sensorlosen Positionsbestimmung bei elektromagnetisch betätigten Aktoren vorgestellt. Dabei werden basierend auf einer Signalinjektion die positionsabhängigen Parameter bei der injizierten Frequenz bestimmt und daraus über ein geeignetes Modell die Position des Magnetankers ermittelt. Die Eignung des Verfahrens zur sensorlosen Positionsregelung wird an einem bidirektionalen Proportionalventil anhand praktischer Versuche demonstriert.
Um gegen den Klimawandel vorzugehen, ist im Gebäudebestand eine Reduktion der Treibhausemmissionen nötig. Dafür müssen politische Entscheidungsträger, Wohnungsunternehmen und Baufirmen gemeinsam arbeiten, um CO2 Neutralität zu erreichen. Die energetische Sanierung der bedürftigen Gebäude ist mit den konventionellen Methoden bis zum Jahr 2050 nicht zu erreichen. Das Energiesprong Prinzip bietet einen Lösungsansatz, welcher finanziell interessant ist und mit weniger Personalaufwand in großer Menge umgesetzt werden kann. Es wird die Erkenntnis gewonnen, dass die bisher verwendeten konstruktiven Systeme jedoch noch Optimierungsbedarf haben, um den finanziellen Rahmen des Prinzips einzuhalten und den Massenmarkt bedienen zu können. Die Untersuchungen dieser Arbeit ergeben, dass eine im Prozess eingebundene Gebäudeaufstockung in Holzbauweise eine lohnende Ergänzung sein kann. Aus nachhaltigem Baumaterial wird mit verhältnismäßigem Mehraufwand eine größere Rentabilität der Immobilie bewirkt und dem Problem der Wohnungsknappheit in Städten entgegengewirkt.
Dynamic Real-Time Range Queries (DRRQ) are a common means to handle mobile clients in high-density areas where both, clients requested by the query and the inquirers, are mobile. In contrast to the very well-known continuous range queries, only a few approaches, such as Adaptive Quad Streaming (AQS), address the mandatory scalability and real-time requirements of these so-called ad-hoc mobility challenges. In this paper we present the highly decentralized solution Adaptive Quad Streaming Flexible (AQSflex) as an extension of the already existing more theoretical AQS approach. Beside a highly distributed cell structure without data structures and a lightweight streaming communication, we use a multi-cell-assignment on limited pool resources instead of an idealistic unlimited cell-per-server assignment. The described experimental results show the potential of our local capacity balancing scheme for cell handover in a strongly decentralized setting. Leafs of a cell hierarchy define a kind of self-optimizing fuzzy edge for the processing resources in high-density systems without any centralized controlling or cloud component.
This paper presents the goals, service design approach, and the results of the project “Accessible Tourism around Lake Constance”, which is currently run by different universities, industrial partners and selected hotels in Switzerland, Germany and Austria. In the 1st phase, interviews with different persons with disabilities and elderly persons have been conducted to identify the barriers and pains faced by tourists who want to spend their holidays in the region of Lake Constance as well as possible assistive technologies that help to overcome these barriers. The analysis of the interviews shows that one third of the pains and barriers are due to missing, insufficient, wrong or inaccessible information about the
accessibility of the accommodation, surroundings, and points of interests during the planning phase of the holidays. Digital assistive technologies hence play a
major role in bridging this information gap. In the 2nd phase so-called Hotel-Living-Labs (HLL) have been established where the identified assistive technologies
can be evaluated. Based on these HLLs an overall service for accessible holidays has been designed and developed. In the last phase, this service has been implemented
based on the HLLs as well as the identified assistive technologies and is currently field tested with tourists with disabilities from the three participated countries.
Das Businessmodell europäischer Industrieunternehmen befindet sich derzeit im Wandel vom traditionellen Produkthersteller hin zum Anbieter hybrider Leistungsbündel aus Produkten und begleitenden Dienstleistungen. Ein technisch hochentwickeltes Produktportfolio reicht zukünftig nicht mehr aus, um sich im internationalen Wettbewerb zu differenzieren. Innovative Servicekonzepte bieten Herstellern die Möglichkeit, ein Alleinstellungsmerkmal gegenüber ihren Wettbewerbern aufzubauen und diesen Wettbewerbsvorteil nachhaltig abzusichern.
Die ausgewogene Beitragssammlung dieses Herausgeberwerks liefert einen aktuellen Überblick über erfolgreiche Serviceinnovationen und bietet Unternehmen konkrete Leitfäden, diese auch erfolgreich umzusetzen. Durch die Einbindung hochkarätiger Autoren aus Unternehmenspraxis, Hochschulen und Beratung gelingt es auf einzigartige Weise, das gesamte Spektrum innovativer B2B-Dienstleistungen aufzuzeigen.
Sexistischer Werbung, die gegen die Menschenwürde verstößt, kann über die Auffangnorm des § 3 Abs. 1 UWG bekämpft werden. Dennoch zeigt sich die Rechtsprechung zurückhaltend und stattdessen übernimmt der Deutsche Werberat die Deutungshoheit. Die höchstrichterliche Rechtsprechung konnte sich insoweit bislang nicht fortbilden. Gerade in Zeiten des Wertewandels ist eine aktualisierte höchstrichterliche Rechtsprechung aber nicht zuletzt auch für den Rechtsfrieden unerlässlich.
Research on Shadow IT is facing a conceptual dilemma in cases where previously “covert” systems developed by business entities are integrated in the organizational IT management. These systems become visible, are thus not “in the shadows” anymore, and subsequently do not fit to existing definitions of Shadow IT. Practice shows that some information systems share characteristics of Shadow IT but are created openly in alignment with the IT organization. This paper proposes the term “Business-managed IT” to describe “overt” information systems developed or managed by business entities and distinguishes it from Shadow IT by illustrating case vignettes. Accordingly, our contribution is to suggest a concept and its delineation against other concepts. In this way, IS researchers interested in IT originated from or maintained by business entities can construct theories with a wider scope of application that are at the same time more specific to practical problems. In addition, the terminology allows to value potentially innovative developments by business entities more adequately.
Shadow IT risk
(2015)
In this paper, a novel measurement model based on spherical double Fourier series (DFS) for estimating the 3D shape of a target concurrently with its kinematic state is introduced. Here, the shape is represented as a star-convex radial function, decomposed as spherical DFS. In comparison to ordinary DFS, spherical DFS do not suffer from ambiguities at the poles. Details will be given in the paper. The shape representation is integrated into a Bayesian state estimator framework via a measurement equation. As range sensors only generate measurements from the target side facing the sensor, the shape representation is modified to enable application of shape symmetries during the estimation process. The model is analyzed in simulations and compared to a shape estimation procedure using spherical harmonics. Finally, shape estimation using spherical and ordinary DFS is compared to analyze the effect of the pole problem in extended object tracking (EOT) scenarios.
These days, medical applications of shape memory alloys (SMAs) can be found in cardiovascular devices, gastroenterology and urology as well as in the area of orthopedic implants, orthodontic devices and clinical instrumentation. Their functional properties combined with excellent biocompatibility increase the possibility and the performance of minimally invasive surgeries. Overviews of existing applications can be found in [1-2]. Within the medical field, most of the applications with shape memory (SM) material take advantage of the superelasticity of NiTi SMAs. In contradiction to the superelastic or mechanical SM effect, the application described in this study uses the thermal SM effect for a new medical implant. Before explaining the SM driven intramedullary bone nail in detail, a short introduction to the bone elongation technique is given.
The background of this application on based in the medical fact that normally any tissue reacts to an injury with repair and healing processes through multiplication of cells. If after a transverse osteotomy a strain stimulus is activated, for example by tensile stress, this multiplication of cells and new formation of tissue may be continued for any length of time. Due to this mechanism, even considerable loss of bone caused by fractures or congenital defective positions, may be compensated without bone grafts. The technique of callus distraction by means of external fixation or intramedullary nail stimulates the formation of callus in the bone gap. Callus is the repair tissue of the bone generated in the fracture gap in case of bone fracture or osteotomy. The gap to be bridged should not be wider than 1 mm per day [3]. The process starts with the exudation of callus around the ends of the broken bone. At first, callus is more like a fibrous tissue. Later it hardens due to deposition of calcium and eventually it is converted into true bone. Three weeks after severance, the vascular system is formed. An overview of current bone lengthening techniques, also called callus distraction, can be found in [3]. External systems are normally used for the extension of bones, the bone fragments being fixed on rings by wires. The decisive disadvantages of those external systems are primarily the considerable risk of infection due to protruding wires, noticeable discomfort for the patient because of the external rings, a coarse cosmetic result because of scarring, as well as rather long hospitalization.
Therefore, internal bone extension systems are of great interest to orthopedic surgery.
In the past years, algorithms for 3D shape tracking using radial functions in spherical coordinates represented with different methods have been proposed. However, we have seen that mainly measurements from the lateral surface of the target can be expected in a lot of dynamic scenarios and only few measurements from the top and bottom parts leading to an error-prone shape estimate in the top and bottom regions when using a representation in spherical coordinates. We, therefore, propose to represent the shape of the target using a radial function in cylindrical coordinates, as these only represent regions of the lateral surface, and no information from the top or bottom parts is needed. In this paper, we use a Fourier-Chebyshev double series for 3D shape representation since a mixture of Fourier and Chebyshev series is a suitable basis for expanding a radial function in cylindrical coordinates. We investigate the method in a simulated and real-world maritime scenario with a CAD model of the target boat as a reference. We have found that shape representation in cylindrical coordinates has decisive advantages compared to a shape representation in spherical coordinates and should preferably be used if no prior knowledge of the measurement distribution on the surface of the target is available.
Shared Field, Divided Field
(2020)
Short-Term Density Forecasting of Low-Voltage Load using Bernstein-Polynomial Normalizing Flows
(2023)
The transition to a fully renewable energy grid requires better forecasting of demand at the low-voltage level to increase efficiency and ensure reliable control. However, high fluctuations and increasing electrification cause huge forecast variability, not reflected in traditional point estimates. Probabilistic load forecasts take uncertainties into account and thus allow more informed decision-making for the planning and operation of low-carbon energy systems. We propose an approach for flexible conditional density forecasting of short-term load based on Bernstein polynomial normalizing flows, where a neural network controls the parameters of the flow. In an empirical study with 3639 smart meter customers, our density predictions for 24h-ahead load forecasting compare favorably against Gaussian and Gaussian mixture densities. Furthermore, they outperform a non-parametric approach based on the pinball loss, especially in low-data scenarios.
Side Channel Attack Resistance of the Elliptic Curve Point Multiplication using Eisenstein Integers
(2020)
Asymmetric cryptography empowers secure key exchange and digital signatures for message authentication. Nevertheless, consumer electronics and embedded systems often rely on symmetric cryptosystems because asymmetric cryptosystems are computationally intensive. Besides, implementations of cryptosystems are prone to side-channel attacks (SCA). Consequently, the secure and efficient implementation of asymmetric cryptography on resource-constrained systems is demanding. In this work, elliptic curve cryptography is considered. A new concept for an SCA resistant calculation of the elliptic curve point multiplication over Eisenstein integers is presented and an efficient arithmetic over Eisenstein integers is proposed. Representing the key by Eisenstein integer expansions is beneficial to reduce the computational complexity and the memory requirements of an SCA protected implementation.
Side Channel Attack Resistance of the Elliptic Curve Point Multiplication using Gaussian Integers
(2020)
Elliptic curve cryptography is a cornerstone of embedded security. However, hardware implementations of the elliptic curve point multiplication are prone to side channel attacks. In this work, we present a new key expansion algorithm which improves the resistance against timing and simple power analysis attacks. Furthermore, we consider a new concept for calculating the point multiplication, where the points of the curve are represented as Gaussian integers. Gaussian integers are subset of the complex numbers, such that the real and imaginary parts are integers. Since Gaussian integer fields are isomorphic to prime fields, this concept is suitable for many elliptic curves. Representing the key by a Gaussian integer expansion is beneficial to reduce the computational complexity and the memory requirements of a secure hardware implementation.
We consider classes of (Formula presented.)-by-(Formula presented.) sign regular matrices, i.e. of matrices with the property that all their minors of fixed order (Formula presented.) have one specified sign or are allowed also to vanish, (Formula presented.). If the sign is nonpositive for all (Formula presented.), such a matrix is called totally nonpositive. The application of the Cauchon algorithm to nonsingular totally nonpositive matrices is investigated and a new determinantal test for these matrices is derived. Also matrix intervals with respect to the checkerboard ordering are considered. This order is obtained from the usual entry-wise ordering on the set of the (Formula presented.)-by-(Formula presented.) matrices by reversing the inequality sign for each entry in a checkerboard fashion. For some classes of sign regular matrices, it is shown that if the two bound matrices of such a matrix interval are both in the same class then all matrices lying between these two bound matrices are in the same class, too.
This letter introduces signal constellations based on multiplicative groups of Eisenstein integers, i.e., hexagonal lattices. These sets of Eisenstein integers are proposed as signal constellations for generalized spatial modulation. The algebraic properties of the new constellations are investigated and a set partitioning technique is developed. This technique can be used to design coded modulation schemes over hexagonal lattices.
Nowadays, most digital modulation schemes are based on conventional signal constellations that have no algebraic group, ring, or field properties, e.g. square quadrature-amplitude modulation constellations. Signal constellations with algebraic structure can enhance the system performance. For instance, multidimensional signal constellations based on dense lattices can achieve performance gains due to the dense packing. The algebraic structure enables low-complexity decoding and detection schemes. In this work, signal constellations with algebraic properties and their application in spatial modulation transmission schemes are investigated. Several design approaches of two- and four-dimensional signal constellations based on Gaussian, Eisenstein, and Hurwitz integers are shown. Detection algorithms with reduced complexity are proposed. It is shown, that the proposed Eisenstein and Hurwitz constellations combined with the proposed suboptimal detection can outperform conventional two-dimensional constellations with ML detection.
This thesis emphasizes problems that reports generated by vulnerability scanners impose on the process of vulnerability management, which are a. an overwhelming amount of data and b. an insufficient prioritization of the scan results.
To assist the process of developing means to counteract those problems and to allow for quantitative evaluation of their solutions, two metrics are proposed for their effectiveness and efficiency. These metrics imply a focus on higher severity vulnerabilities and can be applied to any simplification process of vulnerability scan results, given it relies on a severity score and time of remediation estimation for each vulnerability.
A priority score is introduced which aims to improve the widely used Common Vulnerability Scoring System (CVSS) base score of each vulnerability dependent on a vulnerability’s ease of exploit, estimated probability of exploitation and probability of its existence.
Patterns within the reports generated by the Open Vulnerability Assessment System (OpenVAS) vulnerability scanner between vulnerabilities are discovered which identify criteria by which they can be categorized from a remediation actor standpoint. These categories lay the groundwork of a final simplified report and consist of updates that need to be installed on a host, severe vulnerabilities, vulnerabilities that occur on multiple hosts and vulnerabilities that will take a lot of time for remediation. The highest potential time savings are found to exist within frequently occurring vulnerabilities, minor- and major suggested updates.
Processing of the results provided by the vulnerability scanner and creation of the report is realized in the form of a python script. The resulting reports are short, straight to the point and provide a top down remediation process which should theoretically allow to minimize the institutions attack surface as fast as possible. Evaluation of the practicality must follow as the reports are yet to be introduced into the Information Security Management Lifecycle.
Foil-air bearings (FABs) are predominantly used for high-speed, oil-free applications. Offering many advantages such as friction loss at high speeds, stability and price, they lack, however, load capacity as well as start-up and coast-down friction wear resistance.
The friction losses of FABs have been studied experimentally by many authors. In order to predict the friction and, consequently, the lifespan of a FAB, the start-up and coast-down regimes are modelled in such a way that allows for accurate, efficient simulation and later optimisation of lift-off speed and wear characteristics. The proposed simulation method applies the Kirchhoff-Love plate theory to the top foil mapping [20]. This system of differential equations is coupled with the underlying compliant foil to simulate the displacement due to the pressure buildup. Consequently, this coupled system allows for simulation from almost zero rounds per minute (rpm) to full speed. The underlying simulation model uses the finite difference method for spatial discretisation and a temporal explicit Runge-Kutta method.
Difficulties to overcome are the smooth combination of various friction regimes across the sliding surfaces as well as the synchronous coupling of Reynolds, deformation and kinematic equations with highly non-linear terms. Introducing an exponential pressure component based on Greenwood and Tripp’s theory avoids impingement between the rotor and foil.
Bei der Auslegung von Trocknungsprozessen empfindlicher biologischer Güter spielt die Produktqualität eine zunehmend wichtige Rolle. Obwohl der Einfluss der Trocknungsparameter auf die Trocknungskinetik von Äpfeln bereits Gegenstand vieler Studien war, sind die Auswirkungen auf die Produktqualität bisher kaum bekannt. Die Untersuchung dieses Sachverhalts und die Entwicklung geeigneter Prozessstrategien zur Verbesserung der Qualität des resultierenden Produkts, waren das Ziel der vorliegenden Arbeit. In einem ersten Schritt wurden zunächst umfangreiche stationäre Grundlagenversuche durchgeführt, die zeigten, dass eine Lufttemperatur im höheren Bereich, eine möglichst hohe Luftgeschwindigkeit und eine niedrige Taupunkttemperatur zur geringsten Trocknungszeit bei gleichzeitig guter optischer Qualität führt. Die Beurteilung dieser Qualitätsveränderungen erfolgte mit Hilfe einer neu eingeführten Bezugsgröße, der kumulierten thermischen Belastung, die durch das zeitliche Integral über der Oberflächentemperatur repräsentiert wird und die Vergleichbarkeit der Versuchsergebnisse entscheidend verbessert. Im zweiten Schritt wurden die Ergebnisse der Einzelschichtversuche zur Aufstellung eines numerischen Simulationsmodells verwendet, welches sowohl die entsprechenden Transportvorgänge, als auch die Formveränderung des Trocknungsgutes berücksichtigt. Das Simulationsmodell sowie die experimentellen Daten waren die Grundlage zur anschließenden Entwicklung von Prozessstrategien für die konvektive Trocknung von Äpfeln, die die resultierende Produktqualität, repräsentiert durch die Produktfarbe und –form, verbessern und gleichzeitig möglichst energieeffizient sein sollten. In einem weiteren Schritt wurde die Übertragbarkeit auf den industriellen Maßstab untersucht, wobei die entsprechenden Prozessstrategien an einer neu entwickelten, kostengünstigen Trocknungsanlage erfolgreich implementiert werden konnten. Das Ziel einer verbesserten Produktqualität konnte mit Hilfe unterschiedlicher instationärer Trocknungsschemata sowohl am Einzelschichttrockner, als auch im größeren Maßstab erreicht werden. Das vorgestellte numerische Simulationsmodell zeigte auch bei der Vorhersage des instationären Trocknungsprozesses eine hohe Genauigkeit und war außerdem in der Lage, den Trocknungsverlauf im industriellen Maßstab zuverlässig voraus zu berechnen.
Simulationsmethoden bei der Entwicklung von Extremleichtbaukomponenten in Faserverbundbauweise
(2018)
SInCom 2015
(2015)
Deep neural networks (DNNs) are known for their high prediction performance, especially in perceptual tasks such as object recognition or autonomous driving. Still, DNNs are prone to yield unreliable predictions when encountering completely new situations without indicating their uncertainty. Bayesian variants of DNNs (BDNNs), such as MC dropout BDNNs, do provide uncertainty measures. However, BDNNs are slow during test time because they rely on a sampling approach. Here we present a single shot MC dropout approximation that preserves the advantages of BDNNs without being slower than a DNN. Our approach is to analytically approximate for each layer in a fully connected network the expected value and the variance of the MC dropout signal. We evaluate our approach on different benchmark datasets and a simulated toy example. We demonstrate that our single shot MC dropout approximation resembles the point estimate and the uncertainty estimate of the predictive distribution that is achieved with an MC approach, while being fast enough for real-time deployments of BDNNs.
This paper presents a bed system able to analyze a person’s movement, breathing and recognize the positions that the subject is lying on the bed during the night without any additional physical contact. The measurements are performed with sensors placed between the mattress and the bed-frame. An Intel Edison board was used as an endpoint that served as a communication node from the mesh network to external service. Two nodes and Intel Edison are attached to the bottom of the bed frame and they are connected to the sensors. First test results have indicated the potential of the proposed approach for the recognition of sleep positions with 83% of correct recognized positions.
The respiratory rate is a vital sign indicating breathing illness. It is necessary to analyze the mechanical oscillations of the patient's body arising from chest movements. An inappropriate holder on which the sensor is mounted, or an inappropriate sensor position is some of the external factors which should be minimized during signal registration. This paper considers using a non-invasive device placed under the bed mattress and evaluates the respiratory rate. The aim of the work is the development of an accelerometer sensor holder for this system. The normal and deep breathing signals were analyzed, corresponding to the relaxed state and when taking deep breaths. The evaluation criterion for the holder's model is its influence on the patient's respiratory signal amplitude for each state. As a result, we offer a non-invasive system of respiratory rate detection, including the mechanical component providing the most accurate values of mentioned respiratory rate.
To evaluate the quality of a person's sleep it is essential to identify the sleep stages and their durations. Currently, the gold standard in terms of sleep analysis is overnight polysomnography (PSG), during which several techniques like EEG (eletroencephalogram), EOG (electrooculogram), EMG (electromyogram), ECG (electrocardiogram), SpO2 (blood oxygen saturation) and for example respiratory airflow and respiratory effort are recorded. These expensive and complex procedures, applied in sleep laboratories, are invasive and unfamiliar for the subjects and it is a reason why it might have an impact on the recorded data. These are the main reasons why low-cost home diagnostic systems are likely to be advantageous. Their aim is to reach a larger population by reducing the number of parameters recorded. Nowadays, many wearable devices promise to measure sleep quality using only the ECG and body-movement signals. This work presents an android application developed in order to proof the accuracy of an algorithm published in the sleep literature. The algorithm uses ECG and body movement recordings to estimate sleep stages. The pre-recorded signals fed into the algorithm have been taken from physionet1 online database. The obtained results have been compared with those of the standard method used in PSG. The mean agreement ratios between the sleep stages REM, Wake, NREM-1, NREM-2 and NREM-3 were 38.1%, 14%, 16%, 75% and 54.3%.
Sliding-mode observation with iterative parameter adaption for fast-switching solenoid valves
(2016)
Control of the armature motion of fast-switching solenoid valves is highly desired to reduce noise emission and wear of material. For feedback control, information of the current position and velocity of the armature are necessary. In mass production applications, however, position sensors are unavailable due to cost and fabrication reasons. Thus, position estimation by measuring merely electrical quantities is a key enabler for advanced control, and, hence, for efficient and robust operation of digital valves in advanced hydraulic applications. The work presented here addresses the problem of state estimation, i.e., position and velocity of the armature, by sole use of electrical measurements. The considered devices typically exhibit nonlinear and very fast dynamics, which makes observer design a challenging task. In view of the presence of parameter uncertainty and possible modeling inaccuracy, the robustness properties of sliding mode observation techniques are deployed here. The focus is on error convergence in the presence of several sources for modeling uncertainty and inaccuracy. Furthermore, the cyclic operation of switching solenoids is exploited to iteratively correct a critical parameter by taking into account the norm of the observation error of past switching cycles of the process. A thorough discussion on real-world experimental results highlights the usefulness of the proposed state observation approach.
Smart factory and education
(2016)
The introduction of cyber physical systems into production companies is highly changing working conditions and processes as well as business models. In practice a growing discrepancy between big and small respectively medium-sized companies can be observed. Bridging that gap a university smart factory is introduced to give that companies a platform to trial, educate employees and access consultancy. Realizing the smart factory a highly integrated, open and standardized automation concept is shown comprising single devices, production lines up to a higher automation system maintaining a community or business models.
Smart factory and education
(2017)
Smart-Future-Living-Bodensee
(2018)
Compliance hat in der Vergangenheit oftmals versagt, der aktuelle „VW-Abgasskandal“ ist nur ein Beispiel. Es muss nicht alles neu erfunden werden, und nicht alles, was Unternehmen in der Vergangenheit im Bereich Compliance taten, ist schlecht. Aber es ist an der Zeit, Compliance neu zu denken. Worauf kommt es wirklich an im Compliance Management 2.0? Meine Antwort lautet, dass Ernsthaftigkeit und Glaubwürdigkeit gefördert werden müssen und gefördert werden können. Wie, das versuche ich im Rahmen von sechs Thesen zu skizzieren.
So is About Urbanity
(2016)
Südstadt Tübingen is a successful military land redevelopment project, in which functional mix and urban diversity have been identified as main goals. In the whole development process, joint building venture has been utilized as important urban development instrument. On one hand, this instrument helps citizens development adaptive and affordable living space and let them find own identity to the new quarter; on the other hand, it is also important to cultivate urban diversity and suitable spatial feeling, mix relationship in living and working conditions, so that the quarters will have very flexible structure to accommodate diversified urban life styles.
Social Compliance
(2016)