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DeLFI 2014 - Die 12. e-Learning Fachtagung Informatik (2014)

Proceedings der Pre-Conference Workshops der 12. e-Learning Fachtagung Informatik (2014)

Systematic Complex Problem Solving in the Age of Digitalization and Open Innovation (2020)

This book constitutes the refereed proceedings of the 20th International TRIZ Future Conference, TFC 2020, held online at the University Cluj-Napoca, Romania, in October 2020 and sponsored by the International Federation for Information Processing. 34 chapters were carefully peer reviewed and selected from 91 conference submissions. They are organized in the following thematic sections: computing TRIZ; education and pedagogy; sustainable development; tools and techniques of TRIZ for enhancing design; TRIZ and system engineering; TRIZ and complexity; and cross-fertilization of TRIZ for innovation management.

3rd Baden-Württemberg Center of Applied Research Symposium on Information and Communication Systems - SInCom 2016 (2016)

Artificial Intelligence (2020)

The TriRhenaTech alliance presents a collection of accepted papers of the cancelled tri-national 'Upper-Rhine Artificial Intelligence Symposium' planned for 13th May 2020 in Karlsruhe. The TriRhenaTech alliance is a network of universities in the Upper-Rhine Trinational Metropolitan Region comprising of the German universities of applied sciences in Furtwangen, Kaiserslautern, Karlsruhe, and Offenburg, the Baden-Wuerttemberg Cooperative State University Loerrach, the French university network Alsace Tech (comprised of 14 'grandes écoles' in the fields of engineering, architecture and management) and the University of Applied Sciences and Arts Northwestern Switzerland. The alliance's common goal is to reinforce the transfer of knowledge, research, and technology, as well as the cross-border mobility of students.

Artificial Intelligence (2019)

The TriRhenaTech alliance universities and their partners presented their competences in the field of artificial intelligence and their cross-border cooperations with the industry at the tri-national conference 'Artificial Intelligence : from Research to Application' on March 13th, 2019 in Offenburg. The TriRhenaTech alliance is a network of universities in the Upper Rhine Trinational Metropolitan Region comprising of the German universities of applied sciences in Furtwangen, Kaiserslautern, Karlsruhe, and Offenburg, the Baden-Wuerttemberg Cooperative State University Loerrach, the French university network Alsace Tech (comprised of 14 'grandes écoles' in the fields of engineering, architecture and management) and the University of Applied Sciences and Arts Northwestern Switzerland. The alliance's common goal is to reinforce the transfer of knowledge, research, and technology, as well as the cross-border mobility of students.

Cryptanalysis of the Light-Weight Cipher A2U2 (2011)

Abdelraheem, Mohamed Ahmed ; Borghoff, Julia ; Zenner, Erik ; David, Mathieu

Secure Wireless Architecture for Communications in a Parcel Delivery System (2020)

Abdolinezhad, Saeed ; Schappacher, Manuel ; Sikora, Axel

The number of use cases for autonomous vehicles is increasing day by day especially in commercial applications. One important application of autonomous vehicles can be found within the parcel delivery section. Here, autonomous cars can massively help to reduce delivery efforts and time by supporting the courier actively. One important component of course is the autonomous vehicle itself. Nevertheless, beside the autonomous vehicle, a flexible and secure communication architecture also is a crucial key component impacting the overall performance of such system since it is required to allow continuous interactions between the vehicle and the other components of the system. The communication system must provide a reliable and secure architecture that is still flexible enough to remain practical and to address several use cases. In this paper, a robust communication architecture for such autonomous fleet-based systems is proposed. The architecture provides a reliable communication between different system entities while keeping those communications secure. The architecture uses different technologies such as Bluetooth Low Energy (BLE), cellular networks and Low Power Wide Area Network (LPWAN) to achieve its goals.

Multi-hop Routing Implementation in Spatially Distributed Wireless Sensor Networks for Large-Scale Environmental Monitoring Applications (2019)

Ahmad, Afzal ; Pasha, Muhammad Adeel ; Schappacher, Manuel ; Belhouichet, Assila ; Masud, Shahid ; Sikora, Axel

With the surge in global data consumption with proliferation of Internet of Things (IoT), remote monitoring and control is increasingly becoming popular with a wide range of applications from emergency response in remote regions to monitoring of environmental parameters. Mesh networks are being employed to alleviate a number of issues associated with single-hop communication such as low area coverage, reliability, range and high energy consumption. Low-power Wireless Personal Area Networks (LoWPANs) are being used to help realize and permeate the applicability of IoT. In this paper, we present the design and test of IEEE 802.15.4-compliant smart IoT nodes with multi-hop routing. We first discuss the features of the software stack and design choices in hardware that resulted in high RF output power and then present field test results of different baseline network topologies in both rural and urban settings to demonstrate the deployability and scalability of our solution.

Time Synchronization for Time Sensitive Networks (2020)

Alkhouri, Kamil ; Sikora, Axel ; Neher, Philipp ; Frick, Frick

Latency Reduction for Narrowband LTE with Semi-Persistent Scheduling (2018)

Amjad, Zubair ; Sikora, Axel ; Hilt, Benoit ; Lauffenburger, Jean-Philippe

The excessive control signaling in Long Term Evolution networks required for dynamic scheduling impedes the deployment of ultra-reliable low latency applications. Semi-persistent scheduling was originally designed for constant bit-rate voice applications, however, very low control overhead makes it a potential latency reduction technique in Long Term Evolution. In this paper, we investigate resource scheduling in narrowband fourth generation Long Term Evolution networks through Network Simulator (NS3) simulations. The current release of NS3 does not include a semi-persistent scheduler for Long Term Evolution module. Therefore, we developed the semi-persistent scheduling feature in NS3 to evaluate and compare the performance in terms of uplink latency. We evaluate dynamic scheduling and semi-persistent scheduling in order to analyze the impact of resource scheduling methods on up-link latency.

Low Latency V2X Applications and Network Requirements: Performance Evaluation (2018)

Amjad, Zubair ; Sikora, Axel ; Hilt, Benoit ; Lauffenburger, Jean-Philippe

Vehicle-to-Everything (V2X) communication promises improvements in road safety and efficiency by enabling low-latency and reliable communication services for vehicles. Besides using Mobile Broadband (MBB), there is a need to develop Ultra Reliable Low Latency Communications (URLLC) applications with cellular networks especially when safety-related driving applications are concerned. Future cellular networks are expected to support novel latencysensitive use cases. Many applications of V2X communication, like collaborative autonomous driving requires very low latency and high reliability in order to support real-time communication between vehicles and other network elements. In this paper, we classify V2X use-cases and their requirements in order to identify cellular network technologies able to support them. The bottleneck problem of the medium access in 4G Long Term Evolution(LTE) networks is random access procedure. It is evaluated through simulations to further detail the future limitations and requirements. Limitations and improvement possibilities for next generation of cellular networks are finally detailed. Moreover, the results presented in this paper provide the limits of different parameter sets with regard to the requirements of V2X-based applications. In doing this, a starting point to migrate to Narrowband IoT (NB-IoT) or 5G - solutions is given.

Latency Reduction in Narrowband 4G LTE Networks (2018)

Amjad, Zubair ; Sikora, Axel ; Lauffenburger, Jean-Philippe

The next generation cellular networks are expected to improve reliability, energy efficiency, data rate, capacity and latency. Originally, Machine Type Communication (MTC) was designed for low-bandwidth high-latency applications such as, environmental sensing, smart dustbin, etc., but there is additional demand around applications with low latency requirements, like industrial automation, driver-less cars, and so on. Improvements are required in 4G Long Term Evolution (LTE) networks towards the development of next generation cellular networks for providing very low latency and high reliability. To this end, we present an in-depth analysis of parameters that contribute to the latency in 4G networks along with a description of latency reduction techniques. We implement and validate these latency reduction techniques in the open-source network simulator (NS3) for narrowband user equipment category Cat-Ml (LTE-M) to analyze the improvements. The results presented are a step towards enabling narrowband Ultra Reliable Low Latency Communication (URLLC) networks.

Entwicklung eines energieautarken Türschildes mit E-Paper-Display und NFC-Konfigurationsschnittstelle (2021)

Angermayr, Andreas ; Mackensen, Elke

Elektronische Türschilder zur Darstellung von Informationen sind insbesondere in öffentlichen Gebäuden zwischenzeitlich weit verbreitet. Die Varianz dieser elektronischen Türschilder reicht vom Tablet-basierten Türschild bis hin zum PC-basierten Türschild mit externem Bildschirm. Zumeist werden die Systeme mit 230 V betrieben. Bei einer großen Summe von Türschildern in öffentlichen Gebäuden kann dies zu einem signifikanten Umsatz an Energie führen. Im Rahmen dieses Papers wird die Entwicklung eines energieautarken arbeiten Türschildes vorgestellt, bei dem ein E-Paper-Display zum Einsatz kommt. Das Türschild lässt sich per Smartphone-App und NFC-Schnittstelle konfigurieren. Es wird insbesondere auf das Low-Power-Hardware-Design der Elektronik und energetische Aspekte eingegangen.

NEXCODE: Next Generation Uplink Coding Techniques (2016)

Baldi, Marco ; Bertinelli, Massimo ; Chiaraluce, Franco ; Closas, Pau ; Garello, Roberto ; Maturo, Nicola ; Navarro, Mònica ; Palomo, Jose Maria ; Paolini, Enrico ; Pfletschinger, Stephan ; Silva, Pedro Freire ; Simone, Lorenzo ; Vilà-Valls, Jordi

Verifikation eines Mikrokontrollersystems durch Emulation auf FPGA und darauf folgende Synthese und Routing in einer 0,35 µm Technologie (2004)

Bau, Daniel

VHDL-Entwurf eines I²C-Interfaces und Emulation mit einem Mikroprozessorkern auf FPGA (2004)

Bau, Daniel

Development of an Electro Physiological Front End with SPI-Bus Connection (2008)

Bau, Daniel

Development of a Physiological Front End with SPI Bus Connection (2008)

Bau, Daniel

Im Rahmen einer Master Thesis wurde ausgehend von einem vorhandenen System On Chip Design, welches eingehende EKG-Datensignale verarbeitet, das bestehende System so erweitert dass es komplett über den standardisierten SPI-Bus steuerbar und auslesbar ist.

Der UMC 0.18 Design Flow am Beispiel eines PDA- Processor -IC s (2009)

Bau, Daniel ; Jansen, Dirk

Development and Automatization of a Biogas Test Bench for a Membrane based in-situ Methanation of Hydrogen (2016)

Bauer, Annika ; Haas, Katharina ; Hochberg, Ulrich ; Zell, Christiane

Sustainable Education in Inventive Problem Solving with TRIZ and Knowledge-Based Innovation at Universities (2018)

Belski, Iouri ; Cavallucci, Denis ; Hentschel, Claudia ; Hiltmann, Kai ; Huber, Norbert ; Koltze, Karl ; Livotov, Pavel ; Shukhmin, Konstantin ; Thurnes, Christian

Accelerated transformation of the society and industry through digi-talization, artificial intelligence and other emerging technologies has intensified the need for university graduates that are capable of rapidly finding breakthrough solutions to complex problems, and can successfully implement innovation con-cepts. However, there are only few universities making significant efforts to com-prehensively incorporate creative and systematic tools of TRIZ (theory of in-ventive problem solving) and KBI (knowledge-based innovation) into their de-gree structure. Engineering curricula offer little room for enhancing creativity and inventiveness by means of discipline‐specific subjects. Moreover, many ed-ucators mistakenly believe that students are either inherently creative, or will in-evitably obtain adequate problem-solving skills as a result of their university study. This paper discusses challenges of intelligent integration of TRIZ and KBI into university curricula. It advocates the need for development of standard guidelines and best-practice recommendations in order to facilitate sustainable education of ambitious, talented, and inventive specialists. Reflections of educa-tors that teach TRIZ and KBI to students from mechanical, electrical, process engineering, and business administration are presented.

Design Criteria For Robust And Secure Next Generation CPV Control Systems (2013)

Benoit, Pascal ; Fey, Simon ; Rohbogner, Gregor ; Kohrs, Robert ; Wittwer, Christof ; George, Dicken ; Wüllner, Johannes ; Gombert, Andreas

The design of control systems of concentrator photovoltaic power plants will be more challenging in the future. Reasons are cost pressure, the increasing size of power plants, and new applications for operation, monitoring and maintenance required by grid operators, manufacturers and plant operators. Concepts and products for fixed-mounted photovoltaic can only partly be adapted since control systems for concentrator photovoltaic are considerable more complex due to the required high accurate sun-tracking. In order to assure reliable operation during a lifetime of more than 20 years, robustness of the control system is one crucial design criteria. This work considers common engineering technics for robustness, safety and security. Potential failures of the control system are identified and their effects are analyzed. Different attack scenarios are investigated. Outcomes are design criteria that encounter both: failures of system components and malicious attacks on the control system of future concentrator photovoltaic power plants. Such design criteria are a transparent state management through all system layers, self-tests and update capabilities for security concerns. The findings enable future research to develop a more robust and secure control system for concentrator photovoltaics when implementing new functionalities in the next generation.

An OMNeT++ Model of the Control System of large-scale Concentrator Photovoltaic Power Plants (2013)

Benoit, Pascal ; Fey, Simon ; Rohbogner, Gregor ; Kreifels, Niklas ; Kohrs, Robert

The communication system of a large-scale concentrator photovoltaic power plant is very challenging. Manufacturers are building power plants having thousands of sun tracking systems equipped with communication and distributed over a wide area. Research is necessary to build a scalable communication system enabling modern control strategies. This poster abstract describes the ongoing work on the development of a simulation model of such power plants in OMNeT++. The model uses the INET Framework to build a communication network based on Ethernet. First results and problems of timing and data transmission experiments are outlined. The model enables research on new communication and control approaches to improve functionality and efficiency of power plants based on concentrator photovoltaic technology.

End-of-life prediction of lithium-ion battery cells based on mechanistic ageing models of the graphite electrode (2018)

Bessler, Wolfgang G.

Simulation-based degradation assessment of lithium-ion batteries in a hybrid electric vehicle (2017)

Bessler, Wolfgang G. ; Weißhar, Björn

CPU-based covert- and side-channels in cloud ecosystems (2015)

Betz, Johann-Wolfram ; Westhoff, Dirk

Covert and Side-Channels have been known for a long time due to their versatile forms of appearance. For nearly every technical improvement or change in technology, such channels have been (re-)created or known methods have been adapted. For example the introduction of hyperthreading technology has introduced new possibilities for covert communication between malicious processes because they can now share the arithmetic logical unit (ALU) as well as the L1 and L2 cache which enables establishing multiple covert channels. Even virtualization which is known for its isolation of multiple machines is prone to covert and side-channel attacks due to the sharing of resources. Therefore itis not surprising that cloud computing is not immune to this kind of attacks. Even more, cloud computing with multiple, possibly competing users or customers using the same shared resources may elevate the risk of unwanted communication. In such a setting the ”air gap” between physical servers and networks disappears and only the means of isolation and virtual separation serve as a barrier between adversary and victim. In the work at hand we will provide a survey on weak spots an adversary trying to exfiltrate private data from target virtual machines could exploit in a cloud environment. We will evaluate the feasibility of example attacks and point out possible mitigation solutions if they exist.

2nd Baden-Württemberg Center of Applied Research Symposium on Information and Communication Systems - SInCom 2015 (2015)

Betz, Johann-Wolfram ; Westhoff, Dirk ; Yushev, Artem ; Sikora, Axel ; Walz, Andreas

Enthält die Artikel: "CPU-based Covert- and Side-Channels in Cloud Ecosystems" von Johann Betz und Dirk Westhoff, S. 19-23 "The overview of Public Key Infrastructure based security approaches for vehicular communications" von Artem Yushev und Axel Sikora, S. 30-35 "Testing Embedded TLS Implementations Using Fuzzing Techniques and Differential Testing" von Andreas Walz und Axel Sikora, S. 36-40

Design and Verification of a Mixed-Signal SoC for Biomedical Applications (2015)

Bhattacharyya, Mayukh ; Dusch, Benjamin ; Jansen, Dirk ; Mackensen, Elke

In this paper an RFID/NFC (ISO 15693 standard) based inductively powered passive SoC (system on chip) for biomedical applications is presented. A brief overview of the system design, layout techniques and verification method is dis-cussed here. The SoC includes an integrated 32 bit microcontroller, sensor interface circuit, analog to digital converter, integrated RAM, ROM and some other peripherals required for the complete passive operation. The entire chip is realized in CMOS 0.18 μm technology with a chip area of 1.52mm x 3.24 mm.

Preface: International Marketing Campaign of the Research Cluster zafh.net (2009)

Bollin, Elmar

Nachhaltigkeitskriterien im Facilitymanagement (2004)

Bollin, Elmar

Prognosegestützte TABS-Steuerung (2013)

Bollin, Elmar

Operation Analysis and Experiences of a Solar-Thermal system Assisting the Air Conditioning of an Office Building at Esslingen Germany (2012)

Bollin, Elmar ; Huber, Klaus ; Scheck, Eva

Erste Ergebnisse und Betriebserfahrungen des Detailmonitorings einer solarthermischen Anlage zur Unterstützung der Kälteversorgung eines Büro- und Verwaltungsgebäudes (2009)

Bollin, Elmar ; Huber, Klaus ; Scheck, Eva

Die Hochschule Offenburg begleitet seit Juli 2006 in Zusammenarbeit mit dem Fraunhofer ISE in Freiburg, die solar unterstützte Klimatisierung der Festo AG & Co. KG in Esslingen im Rahmen des Forschungsvorhabens Solarthermie2000plus. Dabei wurde die bereits bestehende Adsorptionskälteanlage, die bisher mit Gaskesseln und Kompressorenabwärme betrieben wurde, durch eine Solaranlage als dritte Wärmequelle ergänzt.

Adsorption von CO2 und racemischen Wirkstoffen an nanoskaligen Trägern (2014)

Bolten, Dennis ; Staudt, Reiner ; Türk, Michael

Eine neue Prozessidee zur Auftrennung racemischer Wirkstoffe unter Verwendung nanoskaliger AlO(OH)‐Hohlkugeln als Adsorbens und überkritischen Kohlenstoffdioxides (sc‐CO2) als Lösungsmittel wird vorgestellt. Zur Auslegung des Prozesses werden Untersuchungen zur Abscheidung der racemischen Wirkstoffe (RS)‐Flurbiprofen, (RS)‐Ibuprofen, (RS)‐Ketoprofen und den reinen Enantiomeren (R)‐Flurbiprofen, (S)‐Ibuprofen und (S)‐Ketoprofen an AlO(OH)‐Hohlkugeln präsentiert und bewertet. Zudem werden Adsorptionsdaten von gasförmigem CO2 an den Hohlkugeln und kommerziellen AlO(OH)‐Partikeln, die mit einer Magnetschwebewaage ermittelt wurden, verglichen. Abschließend werden erste Ergebnisse von orientierenden Versuchen zur Adsorption von racemischem Flurbiprofen aus sc‐CO2 an den Hohlkugeln vorgestellt.

Firmware update over the air for small microcontrollers (2011)

Braun, Nathan ; Sikora, Axel

KOBRA: Praxisfähige lernbasierte Verfahren zur automatischen Konfiguration von Business-Regeln in Duplikaterkennungssystemen (2021)

Braun, Simone ; Alkhouri, Georges ; Peukert, Eric

Duplikaterkennung, -suche und -konsolidierung für Kunden- und Geschäftspartnerdaten, sog. „Identity Resolution“, ist die Voraussetzung für erfolgreiches Customer Relationship Management und Customer Experience Management, aber auch für das Risikomanagement zur Minimierung von Betrugsrisiken und Einhaltung regulatorischer Vorschriften und viele weitere Anwendungsfälle. Diese Systeme sind jedoch hochkomplex und müssen individuell an die kundenspezifischen Anforderungen angepasst werden. Der Einsatz lernbasierter Verfahren bietet großes Potenzial zur automatisierten Anpassung. In diesem Beitrag präsentieren wir für ein KMU praxisfähige, lernbasierte Verfahren zur automatischen Konfiguration von Business-Regeln in Duplikaterkennungssystemen. Dabei wurden für Fachanwender Möglichkeiten entwickelt, um beispielgetrieben das Match-System an individuelle Business-Regeln (u.a. Umzugserkennung, Sperrlistenabgleich) anzupassen und zu konfigurieren. Die entwickelten Verfahren wurden evaluiert und in einer prototypischen Lösung integriert. Wir konnten zeigen, dass unser Machine-Learning-Verfahren, die von einem Domainexperten erstellten Business-Regeln für das Duplikaterkennungssystem „identity“ verbessern konnte. Zudem konnte der hierzu erforderliche Zeitaufwand verkürzt werden.

Biomedical techniques in the treatment of cardiac atrial septum defects (2016)

Brenner, Corinna ; Brudsche, Markus ; Haber, Tobias ; Jones, Wesley

Sizing of Cardiac Closure Systems Using Carto XP (2018)

Brenner, Corinna ; Haber, Tobias ; Härtig, Johannes ; Melichercik, Juraj ; Ismer, Bruno ; Haas, Nikolaus A.

Percutaneous left atrial appendage occluder devices (2015)

Brenner, Corinna ; Härtig, Johannes ; Melichercik, Juraj ; Ismer, Bruno

Werbung wird erwachsen – Professionalisierung und Versachlichung für eine Trendbranche (2004)

Breyer-Mayländer, Thomas

Regional koordinierte digitale Bildungsprojekte (2019)

Breyer-Mayländer, Thomas

Ganztagsschule in Baden-Württemberg – aktueller Sachstand und Perspektiven (2017)

Breyer-Mayländer, Thomas ; Ritter, Beate

Recent Extracardiac Radiofrequency Ablation (2015)

Brudsche, Markus ; Haber, Tobias ; Perez Escobar, Laura ; Härtig, Johannes ; Melichercik, Juraj ; Ismer, Bruno

Exploring Low-Cost Materials to Make Pattern-Based Lock-Screens Accessible for Users with Visual Impairments or Deafblindness (2020)

Buchweitz, Lea ; Theil, Arthur ; Gay, James ; Korn, Oliver

Nowadays, the wide majority of Europeans uses smartphones. However, touch displays are still not accessible by everyone. Individuals with deafblindness, for example, often face difculties in accessing vision-based touchscreens. Moreover, they typically have few fnancial resources which increases the need for customizable, low-cost assistive devices. In this work-in-progress, we present four prototypes made from low-cost, every-day materials, that make modern pattern lock mechanisms more accessible to individuals with vision impairments or even with deafblindness. Two out of four prototypes turned out to be functional tactile overlays for accessing digital 4-by-4 grids that are regularly used to encode dynamic dot patterns. In future work, we will conduct a user study investigating whether these two prototypes can make dot-based pattern lock mechanisms more accessible for individuals with visual impairments or deafblindness.

Kurzes Tutorium Statistik - Kurzvideos auf YouTube (2015)

Bärtl, Mathias

Lerntrails und Augmented Reality: Technische, organisatorische und konzeptionelle Gestaltungsspielräume (2019)

Bärtl, Mathias

Die Möglichkeit zur digitalen Verbindung geographischer Orte mit Aufgaben, Herausforderungen oder Lernmaterialien hat eine Vielzahl von Anwendungen auch außerhalb der Mathematikbildung inspiriert. Dieser Beitrag stellt eine exemplarische Auswahl solcher Applikationen vor und versucht, die technischen, organisatorischen und konzeptionellen Gestaltungselemente zu systematisieren. Die Ausführungen sollen als Anregung bei der Anlage von Mathematiktrails sowie bei der Weiterentwicklung technischer Lösungen für den Lehreinsatz dienen.

Nutzungsmuster bei digitalen Medien. Jahrestagung der Gesellschaft für Didaktik der Mathematik vom 05. bis 09.03.2018 in Paderborn (2018)

Bärtl, Mathias

Die Erstellung und der Einsatz digitaler Medien basieren häufig auf der Annahme eines idealtypischen Lernprozesses, welcher die effektive Erarbeitung von Inhalten unter Berücksichtigung individueller Vorkenntnisse und Lebensumstände ermöglicht. Erfahrungen Lehrender legen jedoch die Vermutung nahe, dass Studierende selten ein idealtypisches Lernverhalten an den Tag legen. Für den Beitrag „Nutzungsmuster bei digitalen Medien“ wurden Forschungsarbeiten zu digitalen instruktionalen Medien gezielt ausgewertet, um die tatsächlichen Verhaltensweisen beim Lernen und die hiermit verbundenen Wirkungen aufzuzeigen. Aufbauend auf den Erkenntnissen soll eine Diskussion um mögliche Folgerungen für die Lehre angeregt werden.

Fahrzyklen mit einem kommunalen Mehrzweck-Fahrzeug: Dieselantrieb im Vergleich zu parallelem diesel-elektrischem Hybridantrieb (2011)

Böhler, Frank ; Schwarz, Barbara ; Zahoransky, Richard A.

Numerische Simulation der freien Konvektion im quadratischen Behälter (2006)

Bühler, Karl

The flow around interacting rotating spheres of different size (2004)

Bühler, Karl

Freie Konvektion im vertikalen Spalt – Analytische Lösungen und numerische Simulation (2005)

Bühler, Karl

Energetische Betrachtungen zum Rayleigh-Stokes Problem (2005)

Bühler, Karl ; Zierep, Jürgen

Efficient operation scheduling for adsorption chillers using predictive optimization-based control methods (2017)

Bürger, Adrian ; Sawant, Parantapa ; Bohlayer, Markus ; Altmann-Dieses, Angelika ; Braun, Marco ; Diehl, Moritz

Compact modeling of inkjet printed, high mobility, electrolyte-gated transistors (2016)

Cadilha Marques, Gabriel ; Garlapati, Suresh Kumar ; Dehm, Simone ; Dasgupta, Subho ; Aghassi-Hagmann, Jasmin ; Tahoori, Mehdi Baradaran

High mobility, electrolyte-gated transistors (EGTs) show high DC performance at low voltages (< 2 V). To model those EGTs, we have used different models for the below and the above threshold regime with appropriate interpolation to ensure continuity and smoothness over all regimes. This empirical model matches very well with our measured results obtained by the electrical characterization of EGTs.

From silicon to printed electronics: A coherent modeling and design flow approach based on printed electrolyte gated FETs (2018)

Cadilha Marques, Gabriel ; Rasheed, Farhan ; Aghassi-Hagmann, Jasmin ; Tahoori, Mehdi Baradaran

Enhancing students’ learning skills by enriching the lecture ‘mechanics 1 / statics’ in various interactive ways (2015)

Canz, Michael ; Sikorski, Evgenia

Wie man die Vorlesung "Technische Mechanik 1 - Statik" für alle Beteiligten dynamisch gestaltet (2017)

Canz, Michael ; Sikorski, Evgenia

Lehrende nehmen vielfältige Veränderungen, insbesondere bei Studienanfängern wahr: Vorkenntnisse, Aufnahme- und Konzentrationsfähigkeit werden zunehmend heterogener. In der Vorlesung „Technische Mechanik 1“ wurde darauf konstruktiv reagiert, indem der Ablauf und die Struktur verändert wurden. Aufgaben und ihre Lösungen stehen im Mittelpunkt des Unterrichts. Neben der Lehrenden als aktiv Handelnde wird jeder Studierende im Lauf des Semesters in den Ablauf integriert und muss individuelle Lösungen der verteilten Aufgaben präsentieren. Im Vergleich entwickeln die Studierenden durch „Lernen am Modell“ dadurch ihre methodischen und fachlichen Fähigkeiten weiter. Um den Studierenden die Relevanz der behandelten Themenbereiche zu verdeutlichen wurden spezielle Aufgaben mit einem lebensweltlichem Bezug entwickelt. Befragungen zeigen, dass die Studierenden von den vielfältigen interaktiven Lernangeboten profitieren und die entwickelten Kompetenzen auch auf andere Lernsituationen übertragen.

"IT via ERP": A Novel Approach to Teaching IT Fundamentals to Business Administration students by Means of an Open Source ERP System (2016)

Castro Kohler, Mariela ; Hagen, Tobias

First year Business Administration students tend to regard themselves as “non-computer scientists” and often have a lack of motivation about taking IT courses in general, either because they perceive them as too technical, too difficult or somewhat irrelevant. In an attempt to counteract this perception and increase the levels of engagement and willing attendance to class, we decided to flip the traditional lecture model and develop a new teaching and learning approach for the IT Fundamentals course using an open source Enterprise Resource Planning (ERP) system as the platform from which to draw the various underlying IT concepts and through which the relevant competences can be acquired. This paper describes the implementation process of this new contextualized learning framework “IT via ERP” and the changes in the didactical methods to support it.

GradVis: Visualization and Second Order Analysis of Optimization Surfaces during the Training of Deep Neural Networks (2019)

Chatzimichailidis, Avraam ; Pfreundt, Franz-Josef ; Gauger, Nicolas R ; Keuper, Janis

Current training methods for deep neural networks boil down to very high dimensional and non-convex optimization problems which are usually solved by a wide range of stochastic gradient descent methods. While these approaches tend to work in practice, there are still many gaps in the theoretical understanding of key aspects like convergence and generalization guarantees, which are induced by the properties of the optimization surface (loss landscape). In order to gain deeper insights, a number of recent publications proposed methods to visualize and analyze the otimization surfaces. However, the computational cost of these methods are very high, making it hardly possible to use them on larger networks. In this paper, we present the GradVis Toolbox, an open source library for efficient and scalable visualization and analysis of deep neural network loss landscapes in Tesorflow and PyTorch. Introducing more efficient mathematical formulations and a novel parallelization scheme, GradVis allows to plot 2d and 3d projections of optimization surfaces and trajectories, as well as high resolution second order gradient information for large networks.

Mobile learning a new Paradigm of e-Learning in Optics and Photonics (2009)

Christ, Andreas ; Feißt, Markus ; Curticapean, Dan

The developed solution enables the presentation of animations and 3D virtual reality (VR) on mobile devices and is well suited for mobile learning, thus creating new possibilities in the area of e-learning worldwide. Difficult relations in physics as well as intricate experiments in optics can be visualised on mobile devices without need for a personal computer.

Coding Aspects of Secure GNSS Receivers (2016)

Curran, James T. ; Navarro, Monica ; Anghileri, Marco ; Closas, Pau ; Pfletschinger, Stephan

This paper presents an overview of the coding aspects of a GNSS receiver. Coding allows detection and correction of channel-induced errors at the receiver, here the focus is on the mitigation of threats from malicious interferences. Although the effects of interference at different stages of GNSS baseband processing has been deeply analyzed in the literature, little attention was devoted to its impact on the navigation message decoding stage. Theis paper provides an introduction to the various coding schemes employed by current GNSS signals, discussing their performance in the presence of noise in terms of block-error rate. Additionally, the benefits of soft-decoding schemes for navigation message decoding are highlighted when jamming interferences are present. The proposed scheme requires estimating the noise plus interference power, yielding to enhanced decoding performances under severe jamming conditions. Finally, cryptographic schemes as a means of providing anti-spoofing for geosecurity location-based services, and their potential vulnerability are discussed, with particular emphasis on the dependence on the dependence of the scheme on successful navigation message decoding

International Year of Light opens new dimensions in optics and photonics education (2015)

Curticapean, Dan

University for Children – The Magic of Light (2009)

Curticapean, Dan

The University for Children is a very successful event aiming to spark children‧s interest in science, in this particular lecture in Optics and Photonics. It is from brain research that we know about the significant dependence of successful learning on the fun factor. Researchers in this field have shown that knowledge acquired with fun is stored for a longer time in the long-term memory and can be used both more efficiently and more creatively [1], [2]. Such an opportunity to inspire the young generation for science must not be wasted. The world of Photonics and Optics provides us with a nearly inexhaustible source of opportunities of this kind.

Die Macht der Animationen im Unterricht der Naturwissenschaften-eine didaktische Betrachtung (2007)

Curticapean, Dan

Photonics meet digital art (2014)

Curticapean, Dan ; Israel, Kai

The paper focuses on the work of an interdisciplinary project between photonics and digital art. The result is a poster collection dedicated to the International Year of Light 2015. In addition, an internet platform was created that presents the project. It can be accessed at http://www.magic-of-light.org/iyl2015/index.htm. From the idea to the final realization, milestones with tasks and steps will be presented in the paper. As an interdisciplinary project, students from technological degree programs were involved as well as art program students. The 2015 Anniversaries: Alhazen (1015), De Caus (1615), Fresnel (1815), Maxwell (1865), Einstein (1905), Penzias Wilson, Kao (1965) and their milestone contributions in optics and photonics will be highlighted.

Invisible Light: A global infotainment community based on augmented reality technologies (2015)

Curticapean, Dan ; Israel, Kai ; Vauderwange, Oliver ; Wozniak, Peter

Theoretical details about optics and photonics are not common knowledge nowadays. Physicists are keen to scientifically explain ‘light,’ which has a huge impact on our lives. It is necessary to examine it from multiple perspectives and to make the knowledge accessible to the public in an interdisciplinary, scientifically well-grounded and appealing medial way. To allow an information exchange on a global scale, our project “Invisible Light” establishes a worldwide accessible platform. Its contents will not be created by a single instance, but user-generated, with the help of the global community. The article describes the infotainment portal “Invisible Light,” which stores scientific articles about light and photonics and makes them accessible worldwide. All articles are tagged with geo-coordinates, so they can be clearly identified and localized. A smartphone application is used for visualization, transmitting the information to users in real time by means of an augmented reality application. Scientific information is made accessible for a broad audience and in an attractive manner.

Radiative heat transfer in optical fibers with applications to temperature measurement and controlled splicing processes considering the SP1 approximation (2012)

Curticapean, Dan ; Neculae, Adrian

The paper focuses on a numerical model which describes the radial temperature evolution in an optical fiber during the heating and cooling process according to the SP1 approximation. Based on this model, experimental methods for temperature measurement with optical fibers and for splice process optimization can be developed.

Numerical analysis of the diffusive mass transport in brain tissues with applications to optical sensors (2013)

Curticapean, Dan ; Otte, Andreas ; Neculae, Adrian

In the brain-cell microenvironment, diffusion plays an important role: apart from delivering glucose and oxygen from the vascular system to brain cells, it also moves informational substances between cells. The brain is an extremely complex structure of interwoven, intercommunicating cells, but recent theoretical and experimental works showed that the classical laws of diffusion, cast in the framework of porous media theory, can deliver an accurate quantitative description of the way molecules are transported through this tissue. The mathematical modeling and the numerical simulations are successfully applied in the investigation of diffusion processes in tissues, replacing the costly laboratory investigations. Nevertheless, modeling must rely on highly accurate information regarding the main parameters (tortuosity, volume fraction) which characterize the tissue, obtained by structural and functional imaging. The usual techniques to measure the diffusion mechanism in brain tissue are the radiotracer method, the real time iontophoretic method and integrative optical imaging using fluorescence microscopy. A promising technique for obtaining the values for characteristic parameters of the transport equation is the direct optical investigation using optical fibers. The analysis of these parameters also reveals how the local geometry of the brain changes with time or under pathological conditions. This paper presents a set of computations concerning the mass transport inside the brain tissue, for different types of cells. By measuring the time evolution of the concentration profile of an injected substance and using suitable fitting procedures, the main parameters characterizing the tissue can be determined. This type of analysis could be an important tool in understanding the functional mechanisms of effective drug delivery in complex structures such as the brain tissue. It also offers possibilities to realize optical imaging methods for in vitro and in vivo measurements using optical fibers. The model also may help in radiotracer biomarker models for the understanding of the mechanism of action of new chemical entities.

International Day of Light (IDL): a new forum for interdisciplinary learning concepts in optics and photonics (2019)

Curticapean, Dan ; Vauderwange, Oliver ; Heitz, Benjamin

After the successful International Year of Light 2015, the idea of sustainability became increasingly imminent. After a preparatory year on 16 May 2018, the International Day of Light was launched for the first time. This event was celebrated with a public celebration in Paris at the UNESCO headquarters. In this paper we will present our projects dedicated to the International Day of Light in Paris. Together with a group of students from our university, we had the special opportunity to be integrated in the program of the opening ceremony at UNESCO in Paris. With our interdisciplinary projects we have tried to build a bridge between optics, photonics, art and media installations.

Art and Photonics (2019)

Curticapean, Dan ; Vauderwange, Oliver ; Heitz, Benjamin

In this paper we report on our continuous efforts to apply optics and photonics in art. This results in interdisciplinary projects which sometimes lead to concrete art installations. We presented some of these projects at the UNESCO headquarters in Paris, at the opening ceremony of the International Year of Light and the inaugural ceremony of the International Day of Light. Some newer projects, such as “A Maze: Ingenious Pipes” and “The Power of Your Eyes,” are also presented in this paper.

Astronomical events and their impact on knowledge transfer in optics and photonics (2019)

Curticapean, Dan ; Vauderwange, Oliver ; Heitz, Benjamin

We present our twenty years of experience in the live broadcasting of astronomical events, with the main focus on total lunar eclipses. Our efforts were motivated by the great impact and high number of viewers of these events. Visitors from over a hundred countries watched our live broadcasts. Our viewer record was set on July 27, 2018, with the live transmission of the total lunar eclipse from the Feldberg, the highest mountain in the Black Forest, attracting nearly half a million viewers in five hours. An especially challenging activity was the live observing of the Mercury transit on 9 May 2016, which we presented as ‘live astronomy’ with hands-on telescope. The main goal of this event was to awake our students enthusiasm for optics and astronomy. Furthermore, we report on our experiences with the photography of optical phenomena such as polar lights and green flash.

Astronomical events and how to photograph them (2020)

Curticapean, Dan ; Vauderwange, Oliver ; Heitz, Benjamin ; Haiss, Ulrich

Astronomical phenomena fascinate people from the very beginning of mankind up to today. In this paper the authors will present their experience with photography of astronomical events. The main focus will be on aurora borealis, comet Neowise, total lunar eclipses and how mobile devices open up new possibilities to observe the green flash. Our efforts were motivated by the great impact and high number of viewers of these events. Visitors from over a hundred countries watched our live broadcasts. Furthermore, we report on our experiences with the photography of optical phenomena such as polar lights Fig. 1, comet Neowise with a Delta Aquariids meteor Fig. 11, and lunar eclipses Fig. 12.

New Perspectives in Color Vision using Spectroscopy and Nanotechnology: Application to Media Photonics (2017)

Curticapean, Dan ; Vauderwange, Oliver ; Wozniak, Peter ; Javahiraly, Nicolas

This paper summarizes the basic ideas of the actual research work, based on the question, how quantum dots changes the possibilities of color rendering, with the focus on the human visual perception.

The International Year of Light 2015 and its impact on educational activities (2016)

Curticapean, Dan ; Vauderwange, Oliver ; Wozniak, Peter ; Mandal, Avikarsha

Depth Sensor Based Detection of Obstacles and Notification for Virtual Reality Systems (2019)

Curticapean, Dan ; Wozniak, Peter ; Capobianco, Antonio ; Javahiraly, Nicolas

Walking interfaces offer advantages in navigation of VE systems over other types of locomotion. However, VR helmets have the disadvantage that users cannot see their immediate surroundings. Our publication describes the prototypical implementation of a virtual environment (VE) system, capable of detecting possible obstacles using an RGB-D sensor. In order to warn users of potential collisions with real objects while they are moving throughout the VE tracking area, we designed 4 different visual warning metaphors: Placeholder, Rubber Band, Color Indicator and Arrow. A small pilot study was carried out in which the participants had to solve a simple task and avoid any arbitrarily placed physical obstacles when crossing the virtual scene. Our results show that the Placeholder metaphor (in this case: trees), compared to the other variants, seems to be best suited for the correct estimation of the position of obstacles and in terms of the ability to evade them.

Real-time augmented reality overlay for an energy-efficient car study (2017)

Curticapean, Dan ; Wozniak, Peter ; Javahiraly, Nicolas

Our university carries out various research projects. Among others, the project Schluckspecht is an interdisciplinary work on different ultra-efficient car concepts for international contests. Besides the engineering work, one part of the project deals with real-time data visualization. In order to increase the efficiency of the vehicle, an online monitoring of the runtime parameters is necessary. The driving parameters of the vehicle are transmitted to a processing station via a wireless network connection. We plan to use an augmented reality (AR) application to visualize different data on top of the view of the real car. By utilizing a mobile Android or iOS device a user can interactively view various real-time and statistical data. The car and its components are meant to be augmented by various additional information, whereby that information should appear at the correct position of the components. An engine e.g. could show the current rpm and consumption values. A battery on the other hand could show the current charge level. The goal of this paper is to evaluate different possible approaches, their suitability and to expand our application to other projects at our university.

Augmented Reality Based Real-Time Data Visualization Concept for Ultra-Efficient Car Prototype (2017)

Curticapean, Dan ; Wozniak, Peter ; Javahiraly, Nicolas ; Vauderwange, Oliver

For an ultra-efficient car-engineering project, we aim to utilize AR technology for the driver and engineering team. A real-time monitoring of the car’s operational parameters is crucial for best possible fuel efficiency and overall performance.

Automationsgestützte natürliche Gebäudeklimatisierung in Klassenzimmern (2011)

da Costa Fernandes, Jesus Salazar

Forecast based energy optimization for solar photovoltaic and hybrid energy systems (2014)

da Costa Fernandes, Jesus Salazar

A former remote area power supply was converted to a smart cogeneration subnet with combined heat and power to develop and validate a forecast based energy management at the University of Applied Sciences in Offenburg/Germany. Locally processed weather forecasts and forecasted demand profiles are integrated to allow a precise reaction to changes of fluctuating power sources, changes in scheduled demand profiles and to improve the energy efficiency of the supply. The management of the electrical and thermal storages is influenced by the forecasted energy contributions and the forecasted demand. Further approaches should improve the accuracy of forecasting algorithms and integrate parameter models gained of a detailed monitoring to realize predictive controllers.

Bürogebäude mit Zukunft - energetische Bewertung des Solar Info Center (SIC) Freiburg. (2008)

da Costa Fernandes, Jesus Salazar ; Feldmann, Thomas ; Bollin, Elmar

IDB - Simulation and automation assisted information and control tool for sustainable building operation (2005)

da Costa Fernandes, Jesus Salazar ; Feldmann, Thomas ; Bollin, Elmar

Sustainable Aspects force a building manager to continuous observation of actual states and developments concerning building use, energy and media flows.In the presented approach a communication structure was built up to use different software applications and tools in order to optimize the operation of the building.

PHOTOPUR – PV Powered Process Automation of an AOP Based Water Decontamination (2020)

da Costa Fernandes, Jesus Salazar ; García-Munoz, Patricia ; Sarigul, Gamze ; Robert, Didier ; Keller, Nicolas ; Schmidt, Michael ; Bollin, Elmar

The PHOTOPUR project aims to develop a photocatalytic process as a type of AOPs (Advanced Oxidation Processes) for the elimination of plant protection products (PPP) of the cleaning water used to wash sprayers. At INES a PV based energy supply for the photocatalytic cleaning system was developed within the framework of two bachelor theses and assembled as a demonstration unit. Then the system was step by step extended with further process automation features and pushed to a remote operating device. The final system is now available as a mobile unit mounted on a lab table. The latest step was the photocatalytic reactor module which completed the first PHOTOPUR prototype. The system is actually undergoing an intensive testing phase with performance checks at the consortium partners. First results give an overview about the successful operation.

PHOTOPUR - PV Powered Water Decontamination for Wine Growers (2018)

da Costa Fernandes, Jesus Salazar ; Schmidt, Michael ; Bollin, Elmar ; Ziebold, Florian ; Lapp, Simone

An energy oriented design concept was developed within the research project PHOTOPUR which has the development of a PV powered water cleaning system as main focus. During a wine season Plant Protection Products (PPP) are several times sprayed on plants to protect them of undesired insects and herbs or avoid hazardous fungus types. A work package of the project partner INES in Offenburg led to a design introducing energy profiling already in the early beginning of a product design. The concept is based on three pillars respecting first the requirements of the core process making up filtering and cleaning and secondary aspects which run, support, maintain and monitor the system to secure availability and product reliability. The presented paper shows that the results of the design tools guided the developers to assemble a functional model of the water decontamination unit which was manually tested with its concatenated steps of the water cleaning process.

Use of load profiles to optimize microgrids of non-residential environments (2017)

da Costa Fernandes, Jesus Salazar ; Schmidt, Michael ; Feldmann, Thomas ; Bollin, Elmar

Three real-lab trigeneration microgrids are investigated in non-residential environments (educational, office/administrational, companies/production) with a special focus on domain-specific load characteristics. For accurate load forecasting on such a local level, à priori information on scheduled events have been combined with statistical insight from historical load data (capturing information on not explicitly-known consumer behavior). The load forecasts are then used as data input for (predictive) energy management systems that are implemented in the trigeneration microgrids. In real-world applications, these energy management systems must especially be able to carry out a number of safety and maintenance operations on components such as the battery (e.g. gassing) or CHP unit (e.g. regular test runs). Therefore, energy management systems should combine heuristics with advanced predictive optimization methods. Reducing the effort in IT infrastructure the main and safety relevant management process steps are done on site using a Smart & Local Energy Controller (SLEC) assisted by locally measured signals or operator given information as default and external inputs for any advanced optimization. Heuristic aspects for local fine adjustment of energy flows are presented.

Electrical Right and Left Cardiac Atrioventricular and Left Atrial Delay in Cardiac Resynchronization Therapy Responder and Non-responder with Sinus Rhythm (2018)

Dannberg, Gudrun ; Heinke, Tobias ; Kühnert, Helmut ; Heinke, Matthias

Cardiac resynchronization therapy (CRT) with hemodynamic optimized biventricular pacing is an established therapy for heart failure patients with sinus rhythm, reduced left ventricular ejection fraction and wide QRS complex. The aim of the study was to evaluate electrical right and left cardiac atrioventricular delay and left atrial delay in CRT responder and non-responder with sinus rhythm. Methods: Heart failure patients with New York Heart Association class 3.0 ± 0.3, sinus rhythm and 27.7 ± 6.1% left ventricular ejection fraction were measured by surface ECG and transesophageal bipolar left atrial and left ventricular ECG before implantation of CRT devices. Electrical right cardiac atrioventricular delay was measured between onset of P wave and onset of QRS complex in the surface ECG, left cardiac atrioventricular delay between onset of left atrial signal and onset of left ventricular signal in the transesophageal ECG and left atrial delay between onset and offset of left atrial signal in the transesophageal ECG. Results: Electrical atrioventricular and left atrial delay were 196.9 ± 38.7 ms right and 194.5 ± 44.9 ms left cardiac atrioventricular delay, and 47.7 ± 13.9 ms left atrial delay. There were positive correlation between right and left cardiac atrioventricular delay (r = 0.803 P < 0.001) and negative correlation between left atrial delay and left ventricular ejection fraction (r = −0.694 P = 0.026) with 67% CRT responder. Conclusions: Transesophageal electrical left cardiac atrioventricular delay and left atrial delay may be useful preoperative atrial desynchronization parameters to improve CRT optimization.

FEM-Spannungsanalyse an schräggebohrtem Wellenabsatz (2016)

Daryusi, Ali

FEM-Untersuchungen zur optimierten Gestaltung von Profilwellen mit freiem Verzahnungsauslauf (2016)

Daryusi, Ali

Entlastungskerben an Sicherungsringnuten in Profilwellen (2014)

Daryusi, Ali

Bedeutung der Kerbwirkung für den Konsterukteur : numerische Berechnungen mit Creo Simulate und didaktische Vermittlung in der CAE-Lehre (2013)

Daryusi, Ali

FEM-Untersuchungen zur Überlagerung von konstruktiven Mehrfachkerben beim Zusammentreffen von Evolventenzahnwellen mit Sicherungsringnuten (2012)

Daryusi, Ali

Kerbwirkung an torsionsbeanspruchten Zahnwellenverbindungen mit freiem Auslauf (2011)

Daryusi, Ali

Bestimmung des bezogenen Spannungsgefälles bei Zahnwellen mit freiem Auslauf (2012)

Daryusi, Ali

FEM-Berechnung der Stützwirkung an Durchdringungskerben (2016)

Daryusi, Ali

Der hier vorliegende Beitrag beschreibt die mit der Finite-Elemente-Methode (FEM) gewonnenen Untersuchungsergebnisse zur Bestimmung von Stützziffern und Kerbwirkungszahlen bei Getriebewellen. Es handelt sich dabei zum einen um die Kerbüberlagerung einer umlaufenden Halbkreisnut in Kombination mit überlagerter Querbohrung. Da zur Bestimmung der Stützwirkungszahlen die Berechnung der bezogenen Spannungsgradienten in Tiefenrichtung benötigt wird, wurden die Parameter der Kerbgeometrie (der Umlaufnutradius sowie der Querbohrungsdurchmesser) variiert. Als Ergebnis dieser Arbeit wurde festgehalten, dass sich die Formzahl infolge der Durchdringungskerbe im Vergleich zur Formzahl einer Einzelkerbe (z. B. Umlaufnut oder Querbohrung) erhöht und dementsprechend erhöht sich die Kerbwirkungszahl deutlich im Vergleich zu einer Einzelkerbe. Die numerisch erfassten Kerbwirkungszahlen an den erforschten Durchdringungskerben wurden mit analytischen Ansätzen aus der Fachliteratur verglichen. Entsprechende Diagramme und Zahlenwerte werden zur Abschätzung der Kerbwirkungs- und Stützzahlen je nach Belastungsart Torsion, Biegung und Zug/Druck angegeben.

FEM-Analyse an Stäben mit Halbkreisnut und überlagerter Querbohrung zur Überprüfung des Thum‘schen Verfahrens (2017)

Daryusi, Ali

Blickbasierte Analyse einer Baugruppenzeichnung (2018)

Daryusi, Ali

Im Rahmen der Konstruktionsausbildung an der Hochschule Offenburg wird die Lehre im Fach Technische Dokumentation fortlaufend optimiert. In der vorliegenden Laborstudie wurde das visuelle Wahrnehmen von 34 Maschinenbaustudierenden (2w + 32m) im Alter von 19 bis 29 Jahren mithilfe der Eye-Tracking-Technik und einer Videokamera bei der Analyse einer Baugruppenzeichnung beobachtet.

FEM-Untersuchung zur Milderung von Kerbwirkungen durch Entlastungskerben in Zahnwellen mit Sicherungsringnuten (2014)

Daryusi, Ali ; Benz, Christian

FEM-Optimierung der Spannungskonzentration mit Hilfe von Entlastungskerben an Sicherungsringnuten bei Zahnwellen (2014)

Daryusi, Ali ; Benz, Christian

Der Ersatzdurchmesser dh1 nach DIN 5466 unter der Lupe (2014)

Daryusi, Ali ; Jung, Sebastian

Für die Zahnwellenprofile nach DIN 5480 ist es schwierig, das polare Trägheitsmoment des geschwächten Querschnitts aus der Geometrie festzulegen. Dieses ist jedoch zur Berechnung der Nennspannung oder der Verdrehsteifigkeit erforderlich. Unterschiedliche Nennspannungsdefinitionen stehen dem Konstrukteur zur Verfügung. Diese können z.B. bei der Formzahldarstellung zu Missverständnissen führen. In der Praxis hilft man sich in der Weise, dass man dem durch die Formelemente (Keile, Zähne) geschwächten Querschnitt einen Kreis einbeschreibt und die Spannung einer Ersatzwelle mit dem Durchmesser dh1 dieses einbeschriebenen Kreises ermittelt. Die in der DIN 5466 vorhandene Näherungsgleichung zur Berechnung des Ersatzdurchmessers dh1 verzahnter Wellen geht auf Arbeiten von Nakazawa im Jahr 1951 [Nakazawa, Hajime: On the Torsion of the Spline Shafts. The Japan Society of Mechanical Engineers, 1951, S. 651-658 + S. 643-650, Tokyo Torizo Univers. 1951] und später auf [Schöpf, H.-J.: Festigkeitsuntersuchung an Zahnwellen-Verbindungen mit Spannungsoptik und Dauerschwingversuchen. Dissertation der TU München 1976] zurück. Mit diesem imaginären Durchmesser dh1 kann man das polare Flächenträgheitsmoment und Widerstandsmoment ermitteln. Die Ergebnisgenauigkeit dieser Näherungslösung ist für eine treffsichere Festigkeitsberechnung aus heutiger Sicht unbefriedigend. Ziel dieses Aufsatzes ist es, dem Anwender Möglichkeiten und Ergebnisse zur Verfügung zu stellen, die es ihm gestatten, das effektiv wirkende Widerstandsmoment für verzahnte Wellenprofile genauer zu bestimmen. Dabei wird der dafür notwendige Ersatzdurchmesser mit Hilfe von theoretischen Überlegungen und Programmtools (CAD, Matlab und Excel) für den gesamten nach DIN 5480 festgelegten Geometriebereich unter die Lupe genommen.

Empirische Untersuchungen zum visuellen Wahrnehmen beim Lesen und Verstehen technischer Zeichnungen (2016)

Daryusi, Ali ; Köhler, Grit

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