@article{VannahmeEhrenwirthSchrag2021, author = {Vannahme, Anna and Ehrenwirth, Mathias and Schrag, Tobias}, title = {Enhancement of a district heating substation as part of a low-investment optimization strategy for district heating systems}, volume = {10}, pages = {53}, journal = {Resources}, number = {5}, publisher = {MDPI}, address = {Basel}, issn = {2079-9276}, doi = {https://doi.org/10.3390/resources10050053}, year = {2021}, abstract = {In an ongoing project, low-investment measures for the optimization of district heating systems are analyzed. The optimization strategies are collected in a catalog, which is the core of a guideline. The application of this guideline is demonstrated using two concrete district heating networks as examples. In this study, the improvement of an analog controlled district heating substation by an electronic controller is investigated. High supply temperatures and heat losses are often a challenge in district heating networks. The district heating substations have a major influence on the network return temperatures. The comparison of the two substation setups with analog and electronic controllers is carried out by laboratory measurement. It can be shown that the return temperatures can be reduced by an average of 20 K in winter and transition, as well as 16 K in summer. The district heating network losses are calculated for one of both specific district heating networks. They are calculated from the ratio of network losses to generated energy. The generated energy is the sum of network losses and consumer demand. The thermal losses of the network can be reduced by 3\%. The volume flow in the heating network can be reduced to a quarter. Therefore, the pumping energy requirement drops sharply since these changes cubically affect the volume flow}, language = {en} } @article{MarzahlAubrevilleBertrametal.2021, author = {Marzahl, Christian and Aubreville, Marc and Bertram, Christof and Maier, Jennifer and Bergler, Christian and Kr{\"o}ger, Christine and Voigt, J{\"o}rn and Breininger, Katharina and Klopfleisch, Robert and Maier, Andreas}, title = {EXACT: a collaboration toolset for algorithm-aided annotation of images with annotation version control}, volume = {11}, pages = {4343}, journal = {Scientific Reports}, publisher = {Springer Nature}, address = {London}, issn = {2045-2322}, doi = {https://doi.org/10.1038/s41598-021-83827-4}, year = {2021}, abstract = {In many research areas, scientific progress is accelerated by multidisciplinary access to image data and their interdisciplinary annotation. However, keeping track of these annotations to ensure a high-quality multi-purpose data set is a challenging and labour intensive task. We developed the open-source online platform EXACT (EXpert Algorithm Collaboration Tool) that enables the collaborative interdisciplinary analysis of images from different domains online and offline. EXACT supports multi-gigapixel medical whole slide images as well as image series with thousands of images. The software utilises a flexible plugin system that can be adapted to diverse applications such as counting mitotic figures with a screening mode, finding false annotations on a novel validation view, or using the latest deep learning image analysis technologies. This is combined with a version control system which makes it possible to keep track of changes in the data sets and, for example, to link the results of deep learning experiments to specific data set versions. EXACT is freely available and has already been successfully applied to a broad range of annotation tasks, including highly diverse applications like deep learning supported cytology scoring, interdisciplinary multi-centre whole slide image tumour annotation, and highly specialised whale sound spectroscopy clustering.}, language = {en} } @article{SanchezMoralesDauthHuberetal.2021, author = {S{\´a}nchez Morales, Eduardo and Dauth, Julian and Huber, Bertold and Garc{\´i}a Higuera, Andr{\´e}s and Botsch, Michael}, title = {High precision outdoor and indoor reference state estimation for testing autonomous vehicles}, volume = {21}, pages = {1131}, journal = {Sensors}, number = {4}, publisher = {MDPI}, address = {Basel}, issn = {1424-8220}, doi = {https://doi.org/10.3390/s21041131}, year = {2021}, abstract = {A current trend in automotive research is autonomous driving. For the proper testing and validation of automated driving functions a reference vehicle state is required. Global Navigation Satellite Systems (GNSS) are useful in the automation of the vehicles because of their practicality and accuracy. However, there are situations where the satellite signal is absent or unusable. This research work presents a methodology that addresses those situations, thus largely reducing the dependency of Inertial Navigation Systems (INSs) on the SatNav. The proposed methodology includes (1) a standstill recognition based on machine learning, (2) a detailed mathematical description of the horizontation of inertial measurements, (3) sensor fusion by means of statistical filtering, (4) an outlier detection for correction data, (5) a drift detector, and (6) a novel LiDAR-based Positioning Method (LbPM) for indoor navigation. The robustness and accuracy of the methodology are validated with a state-of-the-art INS with Real-Time Kinematic (RTK) correction data. The results obtained show a great improvement in the accuracy of vehicle state estimation under adverse driving conditions, such as when the correction data is corrupted, when there are extended periods with no correction data and in the case of drifting. The proposed LbPM method achieves an accuracy closely resembling that of a system with RTK.}, language = {en} } @article{SievertStelzleAubrevilleetal.2021, author = {Sievert, Matti and Stelzle, Florian and Aubreville, Marc and M{\"u}ller, Sarina K. and Eckstein, Markus and Oetter, Nicolai and Maier, Andreas and Mantsopoulos, Konstantinos and Iro, Heinrich and Goncalves, Miguel}, title = {Intraoperative free margins assessment of oropharyngeal squamous cell carcinoma with confocal laser endomicroscopy: a pilot study}, volume = {278}, journal = {European Archives of Oto-Rhino-Laryngology and Head \& Neck}, number = {11}, publisher = {Springer Nature}, address = {Cham}, issn = {1434-4726}, doi = {https://doi.org/10.1007/s00405-021-06659-y}, pages = {4433 -- 4439}, year = {2021}, abstract = {Purpose This pilot study aimed to assess the feasibility of intraoperative assessment of safe margins with confocal laser endomicroscopy (CLE) during oropharyngeal squamous cell carcinoma (OPSCC) surgery. Methods We included five consecutive patients confirmed OPSCC and planned tumor resection in September and October 2020. Healthy appearing mucosa in the marginal zone, and the tumor margin, were examined with CLE and biopsy during tumor resection. A total of 12,809 CLE frames were correlated with the gold standard of hematoxylin and eosin staining. Three head and neck surgeons and one pathologist were asked to identify carcinoma in a sample of 169 representative images, blinded to the histological results. Results Healthy mucosa showed epithelium with uniform size and shape with distinct cytoplasmic membranes and regular vessel architecture. CLE optical biopsy of OPSCC demonstrated a disorganized arrangement of variable cellular morphology. We calculated an accuracy, sensitivity, specificity, PPV, and NPV of 86\%, 90\%, 79\%, 88\%, and 82\%, respectively, with inter-rater reliability and κ-value of 0.60. Conclusion CLE can be easily integrated into the intraoperative setting, generate real-time, in-vivo microscopic images of the oropharynx for evaluation and demarcation of cancer. It can eventually contribute to a less radical approach by enabling a more precise evaluation of the cancer margin.}, language = {en} } @article{MehtaEhrenwirthTrinkletal.2021, author = {Mehta, Kedar and Ehrenwirth, Mathias and Trinkl, Christoph and Z{\"o}rner, Wilfried and Greenough, Richard}, title = {The energy situation in Central Asia}, volume = {14}, pages = {2805}, journal = {Energies}, subtitle = {a comprehensive energy review focusing on rural areas}, number = {10}, publisher = {MDPI}, address = {Basel}, issn = {1996-1073}, doi = {https://doi.org/10.3390/en14102805}, year = {2021}, abstract = {The northern part of the globe is dominated by industrialisation and is well-developed. For many years, the southern part of the world (South Asia, Africa etc.) has been a target of research concentrating on access to energy (mainly electricity) in rural regions. However, the Central Asian region has not been a focus of energy research compared to South East Asia and Africa. Despite plentiful domestically available energy resources, the energy supply in Central Asia is very unevenly distributed between urban and rural areas. Almost half of the total population of Central Asia lives in rural areas and there is a lack of access to modern energy services to meet primary needs. To analyse the energy situation (i.e., electricity, heating, hot water consumption, cooking, etc.) in rural Central Asia, this paper reviews residential energy consumption trends in rural Central Asian regions as compared to urban areas. Furthermore, the paper illustrates the potential of renewable energies in Central Asia. To perform the study, a qualitative comparative analysis was conducted based on a literature review, data, and statistical information. In summary, the presented article discusses the rural energy situation analytically and provides in-depth insights of Central Asian energy infrastructure.}, language = {en} } @article{MehtaEhrenwirthMissalletal.2021, author = {Mehta, Kedar and Ehrenwirth, Mathias and Missall, Siegmund and Degembaeva, Nadira and Akmatov, Kuban and Z{\"o}rner, Wilfried}, title = {Energy Profiling of a High-Altitude Kyrgyz Community: Challenges and Motivations to Preserve Floodplain Ecosystems Based on Household Survey}, volume = {13}, pages = {13086}, journal = {Sustainability}, number = {23}, publisher = {MDPI}, address = {Basel}, issn = {2071-1050}, doi = {https://doi.org/10.3390/su132313086}, year = {2021}, abstract = {The floodplain areas along the Naryn River in Kyrgyzstan are essential as they hold the riparian (local) ecosystems because they provide firewood, pastureland, and areas for recreation and protection against erosion. Due to limited access to adequate, reliable, and sustainable energy services, the rural population usually derived their energy needs from multiple natural energy resources (i.e., firewood, charcoal, agricultural residues, animal dung, and wood branches). This is considered a common and predominant practice in rural Kyrgyzstan. This situation leads to a negative impact on local ecosystem services. In addition to that, the reliance on solid fuels contributes to indoor and outdoor air pollution, which is partially threatening the local ecosystem services. By contrast, the employment of renewable-based energy supply systems would substantially reduce the burden on the environment, which is mainly untapped. To integrate renewable energies, it is important to understand the energy behavior of floodplain communities. In that response, the presented article is the first attempt to capture the energy identity of the floodplain community of Kyrgyzstan based on a quantitative energy-based (on-site) household survey. Furthermore, the present research article synthesizes the driving factors that have a (direct or indirect) impact on the energy and local ecosystem services. In addition, the present article proposes a brief pathway for the sustainable energy transition. The article records the recommendation to integrate renewable energies to preserve the local ecosystems of Kyrgyzstan.}, language = {en} } @article{ObermaierRieblAlBayattietal.2021, author = {Obermaier, Christina and Riebl, Raphael and Al-Bayatti, Ali H. and Khan, Sarmadullah and Facchi, Christian}, title = {Measuring the Realtime Capability of Parallel-Discrete-Event-Simulations}, volume = {10}, pages = {636}, journal = {Electronics}, number = {6}, publisher = {MDPI}, address = {Basel}, issn = {2079-9292}, doi = {https://doi.org/10.3390/electronics10060636}, year = {2021}, abstract = {Speeding up Discrete Event Simulations (DESs) is a broad research field. Promising Parallel Discrete Event Simulation (PDES) approaches with optimistic and conservative synchronisation schemes have emerged throughout the years. However, in the area of real-time simulation, PDESs are rarely considered. This is caused by the complex problem of fitting parallel executed DES models to a real-time clock. Hence, this paper gives an extensive review of existing conservative and optimistic synchronisation schemes for PDESs. It introduces a metric to compare their real-time capabilities to determine whether they can be used for soft or firm real-time simulation. Examples are given on how to apply this metric to evaluate PDESs using synthetic and real-world examples. The results of the investigation reveal that no final answer can be given if PDESs can be used for soft or firm real-time simulation as they are. However, boundary conditions were defined, which allow a use-case specific evaluation of the real-time capabilities of a certain parallel executed DES. Using this in-depth knowledge and can lead to predictability of the real-time behaviour of a simulation run.}, language = {en} } @article{TrappMeyerFacchietal.2011, author = {Trapp, Peter and Meyer, Markus and Facchi, Christian and Janicke, Helge and Siewe, Fran{\c{c}}ois}, title = {Building CPU Stubs to Optimize CPU Bound Systems: An Application of Dynamic Performance Stubs}, volume = {4}, journal = {International Journal on Advances in Software}, number = {1\&2}, publisher = {IARIA}, address = {[s. l.]}, issn = {1942-2628}, url = {https://www.iariajournals.org/software/tocv4n12.html}, pages = {189 -- 206}, year = {2011}, language = {en} } @article{Schneider2007, author = {Schneider, Doris}, title = {"Der Schatz, den es zu heben gilt"}, volume = {2007}, journal = {ekz-Report}, subtitle = {ekz-F{\"u}hrungskr{\"a}ftesaminar: "Betriebswirtschaftliche Steuerung in Bibliotheken mit Hilfe der Kosten- und Leistungsrechnung"}, number = {1}, publisher = {ekz}, address = {Reutlingen}, issn = {1867-3406}, pages = {23}, year = {2007}, language = {de} } @article{DonhauserEndterSchmidtetal.2020, author = {Donhauser, Toni and Endter, Udo and Schmidt, Torben and Franke, J{\"o}rg and Baier, Lukas and Schuderer, Peter}, title = {Echtzeitabbild der Produktion}, volume = {110}, journal = {wt Werkstattstechnik online}, subtitle = {Betriebsbegleitende Materialflusssimulation}, number = {4}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {1436-4980}, doi = {https://doi.org/10.37544/1436-4980-2020-04}, pages = {214 -- 219}, year = {2020}, language = {de} } @article{SelmaierDonhauserLechleretal.2019, author = {Selmaier, Andreas and Donhauser, Toni and Lechler, Tobias and Zeitler, Jochen and Franke, J{\"o}rg}, title = {Simulationsgest{\"u}tzte Produktionsplanung flexibler Fertigungssysteme}, volume = {109}, journal = {wt Werkstattstechnik online}, subtitle = {Konzeptionierung einer Materialflusssimulation mittels Echtzeitdaten f{\"u}r die flexible Serienfertigung}, number = {4}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {1436-4980}, doi = {https://doi.org/10.37544/1436-4980-2019-04}, pages = {242 -- 249}, year = {2019}, language = {de} } @article{DonhauserBaierEbersbachetal.2018, author = {Donhauser, Toni and Baier, Lukas and Ebersbach, Tobias and Franke, J{\"o}rg and Schuderer, Peter}, title = {Simulationsbasierte Optimierung von Fabrikabl{\"a}ufen}, volume = {108}, journal = {wt Werkstattstechnik online}, subtitle = {Implementierung und Test eines Algorithmus zur ereignisbasierten Regelung der Materialfl{\"u}sse}, number = {4}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {1436-4980}, doi = {https://doi.org/10.37544/1436-4980-2018-04-27}, pages = {221 -- 227}, year = {2018}, language = {de} } @article{ErikssonThomassonEkbergetal.2018, author = {Eriksson, Lars and Thomasson, Andreas and Ekberg, Kristoffer and Reig, Alberto and Eifert, Mark and Donatantonio, Fabrizio and D'Amato, Antonio and Arsie, Ivan and Pianese, Cesare and Otta, Pavel and Held, Manne and V{\"o}gele, Ulrich and Endisch, Christian}, title = {Look-ahead controls of heavy duty trucks on open roads — six benchmark solutions}, volume = {2019}, journal = {Control Engineering Practice}, number = {83}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1873-6939}, doi = {https://doi.org/10.1016/j.conengprac.2018.10.014}, pages = {45 -- 66}, year = {2018}, language = {en} } @article{SchneiderVoegeleEndisch2019, author = {Schneider, Dominik and V{\"o}gele, Ulrich and Endisch, Christian}, title = {Model-based sensor data fusion of quasi-redundant voltage and current measurements in a lithium-ion battery module}, volume = {2019}, pages = {227156}, journal = {Journal of Power Sources}, number = {440}, publisher = {Elsevier}, address = {New York}, issn = {1873-2755}, doi = {https://doi.org/10.1016/j.jpowsour.2019.227156}, year = {2019}, language = {en} } @article{LiebhartKomsiyskaEndisch2019, author = {Liebhart, Bernhard and Komsiyska, Lidiya and Endisch, Christian}, title = {Passive impedance spectroscopy for monitoring lithium-ion battery cells during vehicle operation}, volume = {2020}, pages = {227297}, journal = {Journal of Power Sources}, number = {449}, publisher = {Elsevier}, address = {New York}, issn = {1873-2755}, doi = {https://doi.org/10.1016/j.jpowsour.2019.227297}, year = {2019}, language = {en} } @article{LewerenzRaheFuchsetal.2020, author = {Lewerenz, Meinert and Rahe, Christiane and Fuchs, Georg and Endisch, Christian and Sauer, Dirk Uwe}, title = {Evaluation of shallow cycling on two types of uncompressed automotive Li(Ni1/3Mn1/3Co1/3)O2-Graphite pouch cells}, volume = {2020}, pages = {101529}, journal = {Journal of Energy Storage}, number = {30}, publisher = {Elsevier}, address = {Amsterdam}, issn = {2352-1538}, doi = {https://doi.org/10.1016/j.est.2020.101529}, year = {2020}, language = {en} } @article{SchmidVoegeleEndisch2020, author = {Schmid, Michael and V{\"o}gele, Ulrich and Endisch, Christian}, title = {A novel matrix-vector-based framework for modeling and simulation of electric vehicle battery packs}, volume = {2020}, pages = {101736}, journal = {Journal of Energy Storage}, number = {32}, publisher = {Elsevier}, address = {Amsterdam}, issn = {2352-1538}, doi = {https://doi.org/10.1016/j.est.2020.101736}, year = {2020}, language = {en} } @article{LiebhartSatzkeKomsiyskaetal.2020, author = {Liebhart, Bernhard and Satzke, Martin and Komsiyska, Lidiya and Endisch, Christian}, title = {Application of nonlinear impedance spectroscopy for the diagnosis of lithium-ion battery cells under various operating conditions}, volume = {2020}, pages = {228673}, journal = {Journal of Power Sources}, number = {480}, publisher = {Elsevier}, address = {New York}, issn = {1873-2755}, doi = {https://doi.org/10.1016/j.jpowsour.2020.228673}, year = {2020}, language = {en} } @article{AxmannHarmoko2021, author = {Axmann, Bernhard and Harmoko, Harmoko}, title = {The Five Dimensions of Digital Technology Assessment with the Focus on Robotic Process Automation (RPA)}, volume = {15}, journal = {Tehnički glasnik}, number = {2}, publisher = {University North}, address = {Koprivnica}, issn = {1848-5588}, doi = {https://doi.org/10.31803/tg-20210429105337}, pages = {267 -- 274}, year = {2021}, abstract = {In Technology Management, the assessment of new digital technologies is a challenging process. Most assessments are focusing on cost \& benefit. These approaches often fail because main points are neglected. In this paper, the holistic approach of "The Five Dimensions of Digital Technology Assessment" will be described with the example of RPA (Robotic Process Automation). RPA is one of the most promising technologies to save data processing efforts in the office. The Five Dimensions of RPA Assessment is performed by assessing the benefits, technology readiness, usability, company readiness, and the costs that burden the company in the RPA implementation.}, language = {en} } @article{AxmannHarmoko2021, author = {Axmann, Bernhard and Harmoko, Harmoko}, title = {Entwicklung eines Bewertungsinstruments f{\"u}r neue digitale Technologien in KMU}, volume = {116}, journal = {Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, subtitle = {Teil 2: Am Beispiel der K{\"u}nstlichen Intelligenz}, number = {5}, publisher = {de Gruyter}, address = {Berlin}, issn = {2511-0896}, doi = {https://doi.org/10.1515/zwf-2021-0041}, pages = {363 -- 367}, year = {2021}, language = {de} }