@article{GrabingerHauserMottok, author = {Grabinger, Lisa and Hauser, Florian and Mottok, J{\"u}rgen}, title = {On the perception of graph layouts}, series = {Journal of Software: Evolution and Process}, journal = {Journal of Software: Evolution and Process}, publisher = {Wiley}, doi = {10.1002/smr.2599}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-62973}, abstract = {In the field of software engineering, graph-based models are used for a variety of applications. Usually, the layout of those graphs is determined at the discretion of the user. This article empirically investigates whether different layouts affect the comprehensibility or popularity of a graph and whether one can predict the perception of certain aspects in the graph using basic graphical laws from psychology (i.e., Gestalt principles). Data on three distinct layouts of one causal graph is collected from 29 subjects using eye tracking and a print questionnaire. The evaluation of the collected data suggests that the layout of a graph does matter and that the Gestalt principles are a valuable tool for assessing partial aspects of a layout.}, language = {en} } @inproceedings{StadtlerNitaDuennweber, author = {Stadtler, Timo and Nita, Spyro and D{\"u}nnweber, Jan}, title = {A Parallel Hybrid Genetic Search for the Capacitated VRP with Pickup and Delivery}, series = {34th International Workshop, LCPC 2021, Newark, DE, USA, October 13-14, 2021}, booktitle = {34th International Workshop, LCPC 2021, Newark, DE, USA, October 13-14, 2021}, doi = {10.35096/othr/pub-6985}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-69854}, abstract = {In the realm of parallel computing, optimization plays a pivotal role in achieving efficient and scalable solutions. In this work, we present the parallelization of a hybrid genetic search for solving the Capacitated Vehicle Routing Problem with Pickup and Delivery (CVRPPD).It leverages the synergy between genetic algorithms and parallel computing to address the complex optimization problem. This hybrid algorithm combines a customized version of local search with a genetic algorithm to compute an effective solution. Our implementation makes use of the Message Passing Interface (MPI) for data distribution and parallel execution. In addition, we run multi-threaded processes on NVIDIA graphical processors using the CUDA technology, which further increases the computation speed and consequently minimizes the runtime. Parallelization also allows the best-improvement strategy to be used instead of the rst-improvement strategy while maintaining the same runtime. We store the resulting routes in a bus route database which we created as the basis of an extensive library of optimal routes for our specifc use case of optimizing bus routes in a rural area. The experimental results on real road data show that the parallel implementation of the Hybrid Genetic Search (HGS) achieves significant improvements in runtime over the sequential implementation above a certain problem size. We believe that our implementation of the parallel hybrid genetic search method can have a great in influence on optimization strategies in parallel computing and can also be applied to other subproblems of the VRP.}, language = {en} } @article{Westner, author = {Westner, Markus}, title = {Low-Code/No-Code: Citizen Developers and the Surprising Future of Business Applications}, series = {HMD Praxis der Wirtschaftsinformatik}, journal = {HMD Praxis der Wirtschaftsinformatik}, publisher = {Springer Fachmedien}, address = {Wiesbaden}, issn = {1436-3011}, doi = {10.1365/s40702-024-01106-y}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-74906}, pages = {1067 -- 1069}, language = {en} } @article{AltmannSchleglVolbert, author = {Altmann, Matthias and Schlegl, Peter and Volbert, Klaus}, title = {A low-power wireless system for energy consumption analysis at mains sockets}, series = {EURASIP Journal on Embedded Systems}, journal = {EURASIP Journal on Embedded Systems}, number = {1}, publisher = {Springer Nature}, doi = {10.1186/s13639-016-0041-y}, pages = {18}, abstract = {Introduction: Improving energy efficiency and reducing energy wastage is an important topic of our time. But it is quite difficult to figure out how much of our total electricity bill can be mapped to which device or at what time the device used it. We believe energy efficiency of normal households can be improved, if this kind of transparency would be available. In this article, we present a system for energy measurement at mains sockets to gain a transparent view of energy consumption for each device in a household. It consists of several smart energy measuring devices (SEMDs) that use a low-power radio protocol to dynamically build and connect to a radio network to transfer power usage date to a server. At the server, the data is stored and can be accessed via web interface. Results: Our primary goal was to build a back-end system for an energy metering platform with very low energy consumption. This platform can provide data for a variety of services that enables users (the consumers) to understand and improve their energy consumption behavior and increase overall energy efficiency of their households.}, language = {en} } @article{StrasserWestnerStrahringer, author = {Strasser, Artur and Westner, Markus and Strahringer, Susanne}, title = {Knowledge transfer in IS offshoring}, series = {Journal of Systems and Information Technology}, volume = {21}, journal = {Journal of Systems and Information Technology}, number = {1}, issn = {1328-7265}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-294}, pages = {36 -- 62}, abstract = {Purpose This paper aims to investigate the main tasks, necessary skills, and the implementation of the offshore coordinator's role to facilitate knowledge transfer in information systems (IS) offshoring. Design/methodology/approach This empirical exploratory study uses the classical Delphi method that includes one qualitative and two quantitative rounds to collect data on IS experts' perceptions to seek a consensus among them. Findings The participants agreed, with strong consensus, for a set of 16 tasks and 15 skills. The tasks focused primarily on relationship management and facilitating knowledge transfer on different levels. The set of skills consists of approximately 25 per cent "hard" skills, e.g. professional language skills and project management skills, and approximately 75 per cent "soft" skills, e.g. interpersonal and communication skills and the ability to deal with conflict. Two factors mainly influence implementing the offshore coordinator role: project size and the number of projects to be supported simultaneously. Practical implications The findings provide indications of how to define and fulfill this crucial role in practice to facilitate the knowledge transfer process in a positive way. Originality/value Similarities in previous research findings are aggregated to examine the intermediate role in detail from a consolidated perspective. This results in the first comprehensive set of critical tasks and skills assigned to the competency dimensions of the universal competency framework, demonstrating which and how many competency dimensions are critical.}, subject = {Betriebliches Informationssystem}, language = {en} } @incollection{ScholzKrenkelTerekhovetal., author = {Scholz, Alexander-Wigbert K. and Krenkel, Lars and Terekhov, Maxim and Friedrich, Janet and Rivoire, Julien and K{\"o}brich, Rainer and Wolf, Ursula and Kalthoff, Daniel and David, Matthias and Wagner, Claus and Schreiber, Laura Maria}, title = {Magnetic Resonance Imaging and Computational Fluid Dynamics of High Frequency Oscillatory Ventilation (HFOV)}, series = {Fundamental Medical and Engineering Investigations on Protective Artificial Respiration}, volume = {116}, booktitle = {Fundamental Medical and Engineering Investigations on Protective Artificial Respiration}, editor = {Hirschel, Ernst Heinrich and Schr{\"o}der, Wolfgang and Fujii, Kozo and Haase, Werner and Leer, Bram and Leschziner, Michael A. and Pandolfi, Maurizio and Periaux, Jacques and Rizzi, Arthur and Roux, Bernard and Shokin, Yurii I. and Klaas, Michael and Koch, Edmund and Schr{\"o}der, Wolfgang}, publisher = {Springer}, address = {Berlin, Heidelberg}, isbn = {978-3-642-20325-1}, doi = {10.1007/978-3-642-20326-8_7}, pages = {107 -- 128}, abstract = {In order to better understand the mechanisms of gas transport during High Frequency Oscillatory Ventilation (HFOV) Magnetic Resonance Imaging (MRI) with contrast gases and numerical flow simulations based on Computational Fluid Dynamics(CFD) methods are performed. Validation of these new techniques is conducted by comparing the results obtained with simplified models of the trachea and a first lung bifurcation as well as in a cast model of the upper central airways with results achieved from conventional fluid mechanical measurement techniques like e.g. Laser Doppler Anemometry (LDA). Further it is demonstrated that MRI of experimental HFOV is feasible and that Hyperpolarized 3He allows for imaging the gas re-distribution inside the lung. Finally, numerical results of oscillatory flow in a 3rd generation model of the lung as well as the impact of endotracheal tubes on the flow regime development in a trachea model are presented.}, language = {en} } @inproceedings{RushSchmidRaptis, author = {Rush, Logan and Schmid, Marina and Raptis, Georgios}, title = {Privacy Challenges in Genomic Data: A Scoping Review of Risks, Mitigation Strategies, and Research Gaps.}, series = {Information and Communication Technology: 13th International Symposium, SOICT 2024, Danang, Vietnam, December 13-15, 2024, Proceedings, Part II}, booktitle = {Information and Communication Technology: 13th International Symposium, SOICT 2024, Danang, Vietnam, December 13-15, 2024, Proceedings, Part II}, publisher = {Springer}, address = {Singapore}, doi = {10.1007/978-981-96-4285-4_34}, pages = {416 -- 430}, abstract = {Advances in genomic research have created new privacy challenges. This scoping review analyzes the risks associated with the processing, storage, and sharing of genomic data including epigenetics, and examines current privacy protection strategies. It also attempts to identify research gaps in this area. Using the PRISMA methodology, 37 relevant studies were identified and analyzed. The results of the risk assessment can be grouped into four main themes: Risks posed by processing of functional genomic data, sharing of genomic data, patient (re-)identification, and dividuality, i.e. the extending of privacy risks to blood relatives. The identified risk mitigation strategies were systematically categorized into five classes: pre-release measures, governance, secure data processing and exchange, access restriction and transparency, anonymization and masking. However, there are some important research gaps that still need to be addressed. The current literature neglects to assess the likelihood of potential breaches and tends to focus only on assessing possible scenarios of privacy risks. It also mainly fails to assess the role of contextualized data and the effectiveness of policies and governance systems with respect to privacy risks.}, language = {en} } @article{SteinhauserRaptis, author = {Steinhauser, Stefanie and Raptis, Georgios}, title = {Design propositions for nudging in healthcare: Adoption of national electronic health recordsystems}, series = {Digital Health}, volume = {9}, journal = {Digital Health}, publisher = {Sage}, issn = {2055-2076}, doi = {10.1177/20552076231181208}, pages = {1 -- 12}, abstract = {Objectives: Electronic health records (EHRs) are considered important for improving efficiency and reducing costs of ahealthcare system. However, the adoption of EHR systems differs among countries and so does the way the decision to par-ticipate in EHRs is presented. Nudging is a concept that deals with influencing human behaviour within the research streamof behavioural economics. In this paper, we focus on the effects of the choice architecture on the decision for the adoption ofnational EHRs. Our study aims to link influences on human behaviour through nudging with the adoption of EHRs to inves-tigate how choice architects can facilitate the adoption of national information systems. Methods: We employ a qualitative explorative research design, namely the case study method. Using theoretical sampling,we selected four cases (i.e., countries) for our study: Estonia, Austria, the Netherlands, and Germany. We collected and ana-lyzed data from various primary and secondary sources: ethnographic observation, interviews, scientific papers, homepages,press releases, newspaper articles, technical specifications, publications from governmental bodies, and formal studies. Results: The findings from our European case studies show that designing for EHR adoption should encompass choice archi-tecture elements (i.e., defaults), technical elements (i.e., choice granularity and access transparency), and institutional ele-ments (i.e., regulations for data protection, information campaigns, and financial incentives) in combination. Conclusions: Our findings provide insights on the design of the adoption environments of large-scale, national EHR systems.Future research could estimate the magnitude of effects of the determinants.}, language = {en} } @incollection{Raptis, author = {Raptis, Georgios}, title = {Privacy and Data Protection: Mission Impossible?}, series = {Consumer Health Informatics}, booktitle = {Consumer Health Informatics}, editor = {Wetter, Thomas}, publisher = {Springer International Publishing}, isbn = {978-3-319-19589-6}, doi = {10.1007/978-3-319-19590-2}, pages = {273 -- 280}, abstract = {Medical confidentiality is very important because it builds the fundament of trust between doctors and patients. In modern health services data protection is essential. But there are also other important security objectives, such as integrity and authenticity of medical data and health services, as their breach can potentially lead to life threatening conditions. State of the art security mechanisms are necessary to protect medical data and services and prevent attacks known as "hacking". They should include in particular cryptography, as you can usually rely on mathematics, more than in software security and access control mechanisms. As patients normally cannot assess the security of a service, security audits or certifications of health services should be provided to generate trust and confidence.}, subject = {Gesundheitswesen}, language = {en} } @article{WoltmannVolkDinzingeretal., author = {Woltmann, Lucas and Volk, Peter and Dinzinger, Michael and Gr{\"a}f, Lukas and Strasser, Sebastian and Schildgen, Johannes and Hartmann, Claudio and Lehner, Wolfgang}, title = {Data Science Meets High-Tech Manufacturing - The BTW 2021 Data Science Challenge}, series = {Datenbank-Spektrum}, volume = {45}, journal = {Datenbank-Spektrum}, publisher = {Springer Nature}, doi = {10.1007/s13222-021-00398-4}, pages = {5 -- 10}, abstract = {For its third installment, the Data Science Challenge of the 19th symposium "Database Systems for Business, Technology and Web" (BTW) of the Gesellschaft f{\"u}r Informatik (GI) tackled the problem of predictive energy management in large production facilities. For the first time, this year's challenge was organized as a cooperation between Technische Universit{\"a}t Dresden, GlobalFoundries, and ScaDS.AI Dresden/Leipzig. The Challenge's participants were given real-world production and energy data from the semiconductor manufacturer GlobalFoundries and had to solve the problem of predicting the energy consumption for production equipment. The usage of real-world data gave the participants a hands-on experience of challenges in Big Data integration and analysis. After a leaderboard-based preselection round, the accepted participants presented their approach to an expert jury and audience in a hybrid format. In this article, we give an overview of the main points of the Data Science Challenge, like organization and problem description. Additionally, the winning team presents its solution.}, language = {en} }