Listen
11 Ergebnisse
Bereich: Suchergebnisse
Publikation Effects of noisy multiobjective test functions applied to evolutionary optimization algorithms(Engineering and Technology Publishing, 2020) Ryter, Remo; Hanne, Thomas; Dornberger, RolfIn this paper we study the effects of noise in multiobjective optimization problems. We consider a test function, which may be affected by noise with different strength and frequency of occurrence. To simplify the analysis, the noise is applied to only one of the objective functions, i.e. one of the objective functions is affected by additional random influences. Three different evolutionary algorithms for multiobjective problems are analyzed in this way: the Covariance Matrix Adaption Evolution Strategy (CMA-ES), the Non-dominated Sorting Genetic Algorithm-II (NSGA-II), and the Particle Swarm Optimization (PSO). The results are presented and analyzed with respect to the resulting Pareto fronts and with respect to the distribution of variable values during the algorithm run. It can be observed that all three algorithms are basically able to derive suitable results. However, only PSO leads to a sparse Pareto front in case of noisy and non-noisy situations while CMA and NSGA-II perform similarly well. In some situations for NSGA-II and more clearly for CMA-ES specific patterns for the variable values (denoted as striae in this paper) can be observed which appear to be partly caused by the noise.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Robotic path planning by Q learning and a performance comparison with classical path finding algorithms(Engineering and Technology, 2022) Chintala, Phalgun Chowdhary; Dornberger, Rolf; Hanne, ThomasQ Learning is a form of reinforcement learning for path finding problems that does not require a model of the environment. It allows the agent to explore the given environment and the learning is achieved by maximizing the rewards for the set of actions it takes. In the recent times, Q Learning approaches have proven to be successful in various applications ranging from navigation systems to video games. This paper proposes a Q learning based method that supports path planning for robots. The paper also discusses the choice of parameter values and suggests optimized parameters when using such a method. The performance of the most popular path finding algorithms such as A* and Dijkstra algorithm have been compared to the Q learning approach and were able to outperform Q learning with respect to computation time and resulting path length.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Optimization of artificial landscapes with a hybridized firefly algorithm(Engineering and Technology Publishing, 2022) Saner, Kevin; Smith, Kyle; Hanne, Thomas; Dornberger, RolfThis paper shows how the metaheuristic Firefly Algorithm (FA) can be enhanced by hybridization with a genetic algorithm to achieve better results for optimization problems. The authors examine which configuration of the hybridized FA performs best during a number of computational tests. The performance of the hybrid FA is compared with that of the regular FA in solving test functions for single-objective optimization problems in two and n-dimensional spaces. The key findings are that more complex optimization problems benefit from the hybrid FA because it outperforms the basic FA. In addition, some useful parameters settings for the suggested algorithm are determined.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Wearables for integrative performance and tactic analyses: opportunities, challenges, and future directions(MDPI, 2020) Lutz, Jonas; Memmert, Daniel; Raabe, Dominik; Dornberger, Rolf; Donath, LarsMicro-electromechanical systems (MEMS) have reduced drastically in size, cost, and power consumption, while improving accuracy. The combination of different sensor technologies is considered a promising step in the monitoring of athletes. Those “wearables” enable the capturing of relevant physiological and tactical information in individual and team sports and thus replacing subjective, time-consuming and qualitative methods with objective, quantitative ones. Prior studies mainly comprised sports categories such as: targeting sports, batting and fielding games as well as net and wall games, focusing on the detection of individual, non-locomotive movements. The increasing capabilities of wearables allow for more complex and integrative analysis expanding research into the last category: invasion sports. Such holistic approaches allow the derivation of metrics, estimation of physical conditions and the analysis of team strategic behavior, accompanied by integrative knowledge gains in technical, tactical, physical, and mental aspects of a sport. However, prior and current researchers find the precise measurement of the actual movement within highly dynamic and non-linear movement difficult. Thus, the present article showcases an overview of the environments in which the wearables are employed. It elaborates their use in individual as well as team-related performance analyses with a special focus on reliability and validity, challenges, and future directions.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Comparison of the behavior of swarm robots with their computer simulations applying target-searching algorithms(Engineering and Technology, 2018) Zhong, Jia; Dornberger, Rolf; Hanne, ThomasThis paper investigates the functionality and quality of the implementation of a search and target surrounding swarm robotic algorithm using physical swarm robots named Kilobots. The implementation was developed and tested in the simulator V-REP, then transferred onto the actually running Kilobots: Ten Kilobots were used for the experiment, where one Kilobot acts as the target and nine Kilobots act as the searchers. The algorithm allows the searchers to swarm out to find the target while avoiding collisions with other searchers, to orbit around other searchers, which are closer to the target, and finally to surround the target once it is found. The results of the implementation using the physical Kilobots are compared with the results of two adjusted computer simulations. Differences between the simulations and the real robot implementation are investigated: Discrepancies regarding the locomotion and the communication capabilities are identified and discussed.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Quantum computing in supply chain management state of the art and research directions(Diponegoro University, 2022) Gachnang, Phillip; Ehrenthal, Joachim; Hanne, Thomas; Dornberger, RolfQuantum computing is the most promising computational advance of the coming decade for solving the most challenging problems in supply chain management and logistics. This paper reviews the state-of-the-art of quantum computing and provides directions for future research. First, general concepts relevant to quantum computers and quantum computing are introduced. Second, the dominating quantum technologies are presented. Third, the quantum industry is analyzed, and recent applications in different fields of supply chain management and logistics are illustrated. Fourth, directions for future research are given. We hope this review to educate and inspire the use of quantum computing in the fields of optimization, artificial intelligence, and machine learning for supply chain and logistics.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Determining information relevance based on personalization techniques to meet specific user needs(Springer, 2018) Thönssen, Barbara; Witschel, Hans Friedrich; Rusinov, Oleg; Dornberger, Rolf04A - Beitrag SammelbandPublikation Using feedback systems thinking to explore theories of digital business for medtech companies(Springer, 2018) von Kutzschenbach, Michael; Schmid, Alexander; Schoenenberger, Lukas; Dornberger, RolfThe rapid innovation of digital technologies poses a significant challenge to the healthcare sector. Digital technologies are transforming stakeholder relationships among established industry actors, including those of manufacturers, hospitals, and patients. To be ahead of competitors and to maintain profitability, medical device technology manufacturers (medtech companies) are urged to shift their business focus from product to customer excellence and thus invest in service offerings, focusing on the costs of alternative value delivery and patient outcomes. Such investments require a systemic and holistic understanding of how these changes in strategy affect the external and internal competitive environment. In this chapter, we propose the use of feedback systems thinking to explore the intended and unintended consequences of shifts in strategy, from sequential value chains to platform-oriented thinking. Taking the perspective of a medtech company in the value chain, we highlight challenges arising from hidden limits to growth that prevent the realization of intended achievements. Based on this, we develop hypotheses for the intended and unintended consequences of investing in digital service offerings. We conclude with a discussion of how systems thinking and modeling can support digital strategy development.04A - Beitrag SammelbandPublikation Java und Objektorientierte Programmierung Ein Leitfaden für Lehre, Unterricht und Selbststudium(Weltbild, 01.09.2010) Dornberger, Rolf; Telesko, RainerDas Buch gliedert sich in drei Teile. Im ersten Teil "Grundlagen der Programmierung" wird der Leser systematisch an das Thema Programmierung herangeführt. Schwerpunkte hier sind die Themen algorithmisches Denken, systematischer Programmentwurf und der Einsatz moderner Softwarekonzepte. Elementare Konzepte von Programmiersprachen (Variablen, Schleifen, Bedingungen, Funktionen/Methoden etc.) werden unter Verwendung von Java veranschaulicht (Demoprogramme sowie Programmierübungen) und einfache Entwicklungswerkzeuge für Java vorgestellt. Im zweiten Teil werden Grundkonzepte der Objektorientierung vorgestellt, Elemente, welche die eigentliche Stärke der Sprache Java ausmachen. Der Leser erlernt schrittweise wesentliche Konzepte wie Klasse, Vererbung, Schnittstelle etc. und übt die Umsetzung anhand vieler Beispiele in Java. Ein Fokus wird dabei auf Grafikoberflächen (GUI), Schnittstellen und nebenläufige Prozesse gelegt. Die Zusammenhänge von objektorientierter Programmierung mit Java und der Unified Modelling Language (UML) wird erklärt und komplexere Entwicklungswerkzeuge für Grafikoberflächen sowie für Computer-aided Software Engineering (CASE) werden vorgestellt. Im dritten Teil wird der Einsatz von Java für komplexere Anwendungen vorgestellt. Aufbauend auf dem im zweiten Teil erarbeiteten soliden Fundament der Java Standard Edition (Java SE 6) für Desktop-Anwendungen wird beispielhaft vorgestellt, wie mit der Java Enterprise Edition (Java EE 5) mehrschichtige, verteilte Unternehmungsanwendungen entwickelt werden können. Verteilte Anwendungen (RMI, Sockets, ...) bis hin zu Servlets und Java Server Pages (mit Java Beans) werden exemplarisch vorgestellt.02 - MonographiePublikation "Vergesslichkeit kann auch positiv sein"(Swiss Professional Media, 21.08.2012) Dornberger, Rolf; Baumann, NathalieRolf Dornberger, Leiter des Instituts für Wirtschaftsinformatik IWI an der Fachhochschule Nordwestschweiz FHNW, über den Umgang mit (zu) vielen Informationen im Arbeitsalltag und den Vorteil des Älterwerdens in dieser Hinsicht. Sich im heutigen Berufsalltag während längerer Zeit konzentriert einer einzigen Tätigkeit zu widmen ist schwierig. Unentwegt blinken Mailankündigungen auf, klingelt das Telefon, bittet jemand spontan um zwei Minuten Gesprächszeit, die dann doch zehn oder mehr Minuten dauert. Es rufen immer mehr Pflichten, welche die tägliche Arbeitszeit in zunehmend kleinere Sequenzen zerlegen. Wie gibt man Gegensteuer?01B - Beitrag in Magazin oder Zeitung