@inproceedings{TrostClausHerrmann, author = {Trost, Marco and Claus, Thorsten and Herrmann, Frank}, title = {Employment of temporary workers and use of overtime to achieve volume flexibility using master production scheduling: monetary and social implications}, series = {Proceedings of the 35th ECMS International Conference on Modelling and Simulation (ECMS 2021): May 31st-June 2nd, 2021, United Kingdom}, booktitle = {Proceedings of the 35th ECMS International Conference on Modelling and Simulation (ECMS 2021): May 31st-June 2nd, 2021, United Kingdom}, editor = {Al-Begain, Khalid}, isbn = {978-3-937436-72-2}, doi = {10.7148/2021-0213}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-24906}, abstract = {Flexibility and in particular volume flexibility is an important topic for industrial manufacturing companies. In this context, the harmonization of the available and required capacity is a central task, especially with increasing fluctuations in customer demand. In classical approaches , this is considered only by the use of additional capacities and there are only a few approaches that combine aspects of personnel planning with production planning. Therefore, this article presents a linear optimization model for master production scheduling that includes aspects of personnel requirements planning. It is used to investigate different strategies for the use of overtime and temporary workers in order to achieve different levels of volume flexibility. With regard to the monetary and social impacts, the results indicate that overtime has a stronger influence to achieve volume flexibility than the use of temporary workers. However, both are affected by substantial deficits in human working conditions. But the results also imply a promising potential for improving the social aspects without a significant increase in costs.}, language = {en} } @inproceedings{TrostClausHerrmann, author = {Trost, Marco and Claus, Thorsten and Herrmann, Frank}, title = {Influence of Company Sizes in adapted Master Production Scheduling for Improving Human Working Conditions}, series = {Proceedings of the 34th International ECMS Conference on Modelling and Simulation, ECMS 2020}, booktitle = {Proceedings of the 34th International ECMS Conference on Modelling and Simulation, ECMS 2020}, editor = {Steglich, Mike}, publisher = {European Council for Modelling and Simulation}, isbn = {978-3-937436-68-5}, doi = {10.7148/2020-0287}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-24817}, pages = {287 -- 293}, abstract = {Sustainability is an important topic in production plan-ning and control. This article contributes in particular the to further research on the social dimension. It pre-sents a linear optimisation model for Master Produc-tion Scheduling in order to improve human working conditions. Existing approaches have already identified a considerable potential for improvements. Further-more, this article analyses the influence of the compa-ny size on workload and costs using an application with a high proportion of manual activities. It is demonstrat-ed that human working conditions can be improved independently from the company size without increas-ing costs. In addition, smaller companies tend to have a higher exhaustion and the workload affects the total costs more in smaller companies. Therefore, smaller companies might benefit more from an improvement in human working conditions.}, language = {en} } @inproceedings{TerbrackHerrmannClaus, author = {Terbrack, Hajo and Herrmann, Frank and Claus, Thorsten}, title = {Deviation in Energy Consumption on Aggregate Production Planning Level in Industry Practice}, series = {Proceedings of the 34th International ECMS Conference on Modelling and Simulation (ECMS 2020)}, booktitle = {Proceedings of the 34th International ECMS Conference on Modelling and Simulation (ECMS 2020)}, editor = {Steglich, Mike}, isbn = {978-3-937436-68-5}, doi = {10.7148/2020-0334}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-24804}, pages = {334 -- 340}, abstract = {In this article, we discuss energy consumption of producing firms on aggregate production planning. While almost constant energy consumption can be the case for a producing firm, highly fluctuating energy demand can occur as well. Together with volatile energy supply, e.g. due to renewable energy sources, this combination of fluctuating energy supply and demand can result in planning uncertainty and high energy costs. We propose different case studies in which such high deviation in the electricity consumption of a producing firm occurs due to aggregate production planning without appropriate consideration of energy consumption.}, language = {en} } @inproceedings{Herrmann, author = {Herrmann, Frank}, title = {The Use of Simulation for Manufacturing Applications}, series = {Proceedings of the 12th International Conference on Advances in System Simulation, SIMUL 2020, 18.-22.10.2020 in Porto, Portugal}, booktitle = {Proceedings of the 12th International Conference on Advances in System Simulation, SIMUL 2020, 18.-22.10.2020 in Porto, Portugal}, publisher = {IARIA XPS Press}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-24899}, abstract = {This paper summarizes six presentations in a session of the track "Use of Simulation for Manufacturing Applications". The research work deals with the following key issues of this track: Modelling of process problems in manufacturing; Solutions of planning problems in manufacturing; Simulation of processes in manufacturing. This publication shows that the contributions in this track address research questions that are of high importance for industrial practice as well as current research directions such as stochastic optimization or the efficient search of large solution spaces.}, language = {en} } @inproceedings{MildeGeislingerLindtetal., author = {Milde, Benjamin and Geislinger, Robert and Lindt, Irina and Baumann, Timo}, title = {Open Source Automatic Lecture Subtitling}, series = {Proceedings of Elektronische Sprachsignalverarbeitung (ESSV): Tagungsband der 32. Konferenz, Berlin, 3.-5. M{\"a}rz 2021}, booktitle = {Proceedings of Elektronische Sprachsignalverarbeitung (ESSV): Tagungsband der 32. Konferenz, Berlin, 3.-5. M{\"a}rz 2021}, publisher = {F{\"o}rderverein Elektronische Sprachsignalverabeitung e.V.}, address = {Berlin, Germany}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:18-228-7-2523}, pages = {128 -- 135}, abstract = {We present a fully automatic solution for German video subtitling, with a focus on lecture videos. We rely entirely on open source models and scripts for German ASR, automatic punctuation reconstruction and subtitle segmentation. All training scripts, 1000h of German speech training data, pre-trained models and the final subtitling program are publicly available. It can readily be integrated into lecture video platforms such as Lecture2Go. The automatically generated subtitles can also serve as a basis to make the video material more accessible (e.g. via search, keyword clouds, and the like) or for further manual revision, potentially helping in significantly speeding up manual work. A particular challenge that we observe in lectures are technical terms that are frequent in a particular lecture, but infrequent in a typical language model and that might be out of vocabulary for a general purpose ASR. We approach this challenge by extracting texts from accompanying lecture slides to adapt the language model of our TDNN-HMM based ASR system. We demonstrate the usability of the full system and its generated subtitles and evaluate on a dataset of manually transcribed lectures with an average of 26.3\% WER.}, language = {en} } @inproceedings{HusseinMeyerSickendiekBaumann, author = {Hussein, Hussein and Meyer-Sickendiek, Burkhard and Baumann, Timo}, title = {How to identify elliptical poems within a digital corpus of auditory poetry}, series = {Elektronische Sprachsignalverarbeitung 2019 (ESSV), Tagungsband der 30. Konferenz, Dresden, 3.-8. M{\"a}rz 2019}, booktitle = {Elektronische Sprachsignalverarbeitung 2019 (ESSV), Tagungsband der 30. Konferenz, Dresden, 3.-8. M{\"a}rz 2019}, editor = {Birkholz, Peter and Stone, Simon}, publisher = {TUDpress}, address = {Dresden, Germany}, isbn = {978-3-959081-57-3}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:18-228-7-2579}, pages = {247 -- 254}, abstract = {Ellipses denote the omission of one or more grammatically necessary phrases. In this paper, we will demonstrate how to identify such ellipses as a rhythmical pattern in modern and postmodern free verse poetry by using data from lyrikline which contain the corresponding audio recording of each poem as spoken by the original author. We present a feature engineering approach based on literary analysis as well as a neural networks based approach for the identification of ellipses within the lines of a poem. A contrast class to the ellipsis is defined from poems consisting of complete and correct sentences. The feature-based approach used features derived from a parser such as verb, comma, and sentence ending punctuation. The classifier of neural networks is trained on the line level to integrate the textual information, the spoken recitation, and the pause information between lines, and to integrate information across the lines within the poem. A statistic analysis of poet's gender showed that 65\% of all elliptical poems were written by female poets. The best results, calculated by the weighted F-measure, for the classification of ellipsis with the contrast class is 0.94 with the neural networks based approach. The best results for classification of elliptical lines is 0.62 with the feature-based approach.}, language = {en} } @inproceedings{BaumannMeyerSickendiekHussein, author = {Baumann, Timo and Meyer-Sickendiek, Burkhard and Hussein, Hussein}, title = {How to Identify Speech When Translating Unpunctuated Poetry}, series = {Proceedings of Elektronische Sprachsignalverarbeitung: Tagungsband der 31. Konferenz, Magdeburg, 4.-6. M{\"a}rz 2020}, booktitle = {Proceedings of Elektronische Sprachsignalverarbeitung: Tagungsband der 31. Konferenz, Magdeburg, 4.-6. M{\"a}rz 2020}, publisher = {F{\"o}rderverein Elektronische Sprachsignalverabeitung e.V.}, address = {Magdeburg, Germany}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:18-228-7-2587}, pages = {165 -- 172}, abstract = {A large proportion of (post)-modern poetry contains no or hardly any punctuation. In our contribution, we will investigate how well punctuation information can be recovered for postmodern poetry based on the information contained in the text and speech of free verse poems. We use the world's largest corpus of spoken (post-)modern poetry from our partner lyrikline which contains the corresponding audio recording of each poem as spoken by the original author and features translations for many of the poems. We identify lines that contain a phrase break in the middle of the poetic line, which may already be helpful for philological analysis on one hand, and identify the position of the break in the line on the other hand. We select those poetic lines that contain one or more punctuation characters that typically indicate a phrase break in poetry (.,;:!?/) somewhere in the middle (rather than only at the end of the line) as our target class. We train a neural network (bidirectional recurrent neural network (RNN) based on gated recurrent units (GRU) with attention) that combines audio and textual features to identify the punctuation with the goal of applying it to reconstruct them within a corpus of unpunctuated poems. Our results clearly indicate that speech is helpful for recovering the constituency structure of post-modern poetry that is partially obfuscated by missing punctuation.}, language = {en} } @inproceedings{BaumannSaboo, author = {Baumann, Timo and Saboo, Ashutosh}, title = {Evaluating Heuristics for Audio-Visual Translation}, series = {Proceedings of the Conference of Computational Humanities Research, (CHR2021): November 17-19, 2021, Amsterdam, The Netherlands}, booktitle = {Proceedings of the Conference of Computational Humanities Research, (CHR2021): November 17-19, 2021, Amsterdam, The Netherlands}, editor = {Ehrmann, Maud}, publisher = {CEUR Workshops}, address = {Amsterdam, the Netherlands}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:18-228-7-2592}, pages = {171 -- 180}, abstract = {Dubbing, i.e., the lip-synchronous translation and revoicing of audio-visual media into a target language from a different source language, is essential for the full-fledged reception of foreign audio-visual media, be it movies, instructional videos or short social media clips. In this paper, we objectify influences on the 'dubbability' of translations, i.e., how well a translation would be synchronously revoiceable to the lips on screen. We explore the value of traditional heuristics used in evaluating the qualitative aspects, in particular matching bilabial consonants and the jaw opening while producing vowels, and control for quantity, i.e., that translations are similar to the source in length. We perform an ablation study using an adversarial neural classifier which is trained to differentiate "true" dubbing translations from machine translations. While we are able to confirm the value of matching lip closure in dubbing, we find that the opening angle of the jaw as determined by the realized vowel may be less relevant than frequently considered in audio-visual translation.}, language = {en} } @inproceedings{Baumann, author = {Baumann, Timo}, title = {Coordinating Speech Delivery to Gesture Progress for Deictic Expressions with Incremental Speech Synthesis}, series = {Proceedings of the Timing in Human-Robot Interaction Workshop held in conjunction with the 9th ACM/IEEE International Conference on Human-Robot Interaction (HRI 2014), Bielefeld, 3. March 2014}, booktitle = {Proceedings of the Timing in Human-Robot Interaction Workshop held in conjunction with the 9th ACM/IEEE International Conference on Human-Robot Interaction (HRI 2014), Bielefeld, 3. March 2014}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:18-228-7-1991}, abstract = {This paper presents ongoing work in incremental speech synthesis that enables a system to adapt speech delivery to unforeseen changes in the timing of motor events (e. g. a robot actuator working faster or slower than anticipated) in order to improve the coordination of speech and gestures for deictic expressions.}, subject = {Sprachverarbeitung}, language = {en} } @inproceedings{Herrmann, author = {Herrmann, Frank}, title = {Einstellung von Losgr{\"o}ßenverfahren in der operativen Produktionsplanung und -steuerung}, series = {Betriebliche Anwendungssysteme : Herausforderungen an die Wirtschaftsinformatik; Tagungsband zur AKWI-Fachtagung vom 11. bis 14.09.2011 an der Fachhochschule Worms}, booktitle = {Betriebliche Anwendungssysteme : Herausforderungen an die Wirtschaftsinformatik; Tagungsband zur AKWI-Fachtagung vom 11. bis 14.09.2011 an der Fachhochschule Worms}, editor = {Barton, Thomas and Erdlenbruch, Burkhard and Herrmann, Frank and M{\"u}ller, Christian}, publisher = {Verlag News \& Media}, address = {Berlin}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2348}, pages = {39 -- 50}, abstract = {Durch eine Zusammenfassung von Produktionsauftr{\"a}gen zu Losen werden R{\"u}staufw{\"a}nde zu Lasten von Best{\"a}nden reduziert. F{\"u}r einen m{\"o}glichst guten Ausgleich dieser Kosten existieren in kommerziell verf{\"u}gbaren IT-Systemen f{\"u}r die operativen Produktionsplanung und -steuerung eine Vielzahl von Losgr{\"o}ßenverfahren. Der Beitrag erl{\"a}utert diese kurz und nennt Einstellhinweise unter industriellen Randbedingungen.}, subject = {PPS}, language = {de} } @inproceedings{WindbuehlerOkkesimChristetal., author = {Windb{\"u}hler, Anna and Okkesim, S{\"u}kr{\"u} and Christ, Olaf and Mottaghi, Soheil and Rastogi, Shavika and Schmuker, Michael and Baumann, Timo and Hofmann, Ulrich G.}, title = {Machine Learning Approaches to Classify Anatomical Regions in Rodent Brain from High Density Recordings}, series = {44th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2022): 11-15 July 2022, Glasgow, Scotland, United Kingdom}, booktitle = {44th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2022): 11-15 July 2022, Glasgow, Scotland, United Kingdom}, publisher = {IEEE}, doi = {10.1109/EMBC48229.2022.9871702}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-35296}, pages = {3530 -- 3533}, abstract = {Identifying different functional regions during a brain surgery is a challenging task usually performed by highly specialized neurophysiologists. Progress in this field may be used to improve in situ brain navigation and will serve as an important building block to minimize the number of animals in preclinical brain research required by properly positioning implants intraoperatively. The study at hand aims to correlate recorded extracellular signals with the volume of origin by deep learning methods. Our work establishes connections between the position in the brain and recorded high-density neural signals. This was achieved by evaluating the performance of BLSTM, BGRU, QRNN and CNN neural network architectures on multisite electrophysiological data sets. All networks were able to successfully distinguish cortical and thalamic brain regions according to their respective neural signals. The BGRU provides the best results with an accuracy of 88.6 \% and demonstrates that this classification task might be solved in higher detail while minimizing complex preprocessing steps.}, language = {en} } @inproceedings{SelmairHanfeldClausetal., author = {Selmair, Maximilian and Hanfeld, Marc and Claus, Thorsten and Herrmann, Frank}, title = {Exploring Opportunities}, series = {Simulation Notes Europe (SNE), Special Issue: Simulation in Production and Logistics: Impact of Energetic Factors}, volume = {27}, booktitle = {Simulation Notes Europe (SNE), Special Issue: Simulation in Production and Logistics: Impact of Energetic Factors}, number = {2}, doi = {10.11128/sne.27.tn.10375}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-2007}, pages = {97 -- 103}, abstract = {Motivated by the increasing share of renewable energy in the markets for energy commodities, this study has evaluated the potential for optimizing production planning by taking into account disposable options for procuring energy, in this case electricity. For this purpose, a material flow simulation study extended by an electricity price simulation has been executed to examine possible cost scenarios. Our findings support the notion of a potential for further research in new optimization models involving energy procurement as well as energy trading options}, subject = {Materialflussplanung}, language = {en} } @inproceedings{WulfLindnerStrahringeretal., author = {Wulf, Frederik and Lindner, Tobias and Strahringer, Susanne and Westner, Markus}, title = {IaaS, PaaS, or SaaS? The Why of Cloud Computing Delivery Model Selection}, series = {Proceedings of the 54th Hawaii International Conference on System Sciences, 2021}, booktitle = {Proceedings of the 54th Hawaii International Conference on System Sciences, 2021}, isbn = {978-0-9981331-4-0}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-7913}, pages = {6285 -- 6294}, abstract = {Most large-scale organizations adopted Cloud Computing (CC) on a company level in recent years. Managers now face the challenge to appropriately implement CC "operationally", i.e., for information systems (ISs). We refer to this as post-adoption, addressing the extent of technology usage after adoption. Specifically, managers need to choose among the CC delivery models Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS), and Software-asa-Service (SaaS). We differentiate the determinants of this post-adoption decision for IaaS, PaaS, and SaaS. Based on this analysis, we derive criteria that guide managers' delivery model selection: Adopt 1) IaaS for ISs requiring flexibility and reduced time to market, 2) PaaS to access specialized resources, and 3) SaaS to focus on core competencies. Moreover, we analyze the impact on the CC strategy and postulate them as recommendations: I) acknowledge the interplay between governance and time-to-market, II) realize cost savings on company level, and III) consider strategically important ISs for CC.}, language = {en} } @inproceedings{SchwertsikWestner, author = {Schwertsik, Andreas and Westner, Markus}, title = {Produktorientierte IT-Leistungsverrechnung als Br{\"u}ckenschlag zwischen IT-Leistungserstellung und -verwendung}, series = {Prozesse, Technologie, Anwendungen, Systeme und Management : Tagungsband zur 27. AKWI-Fachtagung vom 07. bis 10.09.2014 an der Oberbayerischen Technischen Hochschule Regensburg / hrsg. von Thomas Barton}, booktitle = {Prozesse, Technologie, Anwendungen, Systeme und Management : Tagungsband zur 27. AKWI-Fachtagung vom 07. bis 10.09.2014 an der Oberbayerischen Technischen Hochschule Regensburg / hrsg. von Thomas Barton}, organization = {Angewandte Forschung in der Wirtschaftsinformatik}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-928}, pages = {78 -- 91}, abstract = {Das vorliegende Paper untersucht anhand einer Fallstudie die Implementierung einer produktorientierten Leistungsverrechnung f{\"u}r IT-Services im Kontext eines international f{\"u}hrenden Industrieg{\"u}terunternehmens. Zun{\"a}chst werden die {\"o}konomischen und regulatorischen Anforderungen, die zur Ein-f{\"u}hrung des Systems gef{\"u}hrt haben, skizziert. Danach wird der Aufbau und Ablauf des Verrechnungsverfahrens geschildert: auf IT-Leistungserstellungs-seite werden die angefallenen Kosten {\"u}ber die Bildung sogenannter modularer „Service-Bausteine" den organisatorisch verantwortlichen Stellen als auch IT-Services zugeordnet. Auf Basis der geplanten Nachfragemenge werden diese IT-Services bepreist und in einem IT-Servicekatalog verzeichnet. Dort k{\"o}nnen sie von den Fachbereichen nachgefragt werden. Im Sinne von Vorteilen werden u.a. eine verursachungsgerechte Kostenverteilung erm{\"o}glicht, Kostentransparenz und -vergleichbarkeit geschaffen sowie das Kostenbewusstsein bei Leistungsempf{\"a}ngern und -erstellern gef{\"o}rdert. Als Nachteil erweist sich der administrative Aufwand zur Durchf{\"u}hrung der Kalkulation und in der Folge eine gewisse Statik des Systems, da unterj{\"a}hrige {\"A}nderungen nur unter Inkaufnahme von Zusatzaufwand nachgesteuert werden k{\"o}nnen.}, subject = {IT-Abteilung}, language = {de} } @inproceedings{SelgradLierKoeferletal., author = {Selgrad, Kai and Lier, Alexander and K{\"o}ferl, Franz and Stamminger, Marc and Lohmann, Daniel}, title = {Lightweight, Generative Variant Exploration for High-performance Graphics Applications}, series = {GPCE'15 : Proceedings of the 2015 ACM SIGPLAN International Conference on Generative Programming: Concepts and Experiences ; October 26-27, 2015, Pittsburgh, PA, USA}, booktitle = {GPCE'15 : Proceedings of the 2015 ACM SIGPLAN International Conference on Generative Programming: Concepts and Experiences ; October 26-27, 2015, Pittsburgh, PA, USA}, editor = {K{\"a}stner, Christian and Gokhāl{\´e}, Anir{\"u}ddhā}, publisher = {ACM}, address = {New York, USA}, isbn = {978-1-4503-3687-1}, pages = {141 -- 150}, abstract = {Rendering performance is an everlasting goal of computer graphics and significant driver for advances in both, hardware architecture and algorithms. Thereby, it has become possible to apply advanced computer graphics technology even in low-cost embedded appliances, such as car instruments. Yet, to come up with an efficient implementation, developers have to put enormous efforts into hardware/problem-specific tailoring, fine-tuning, and domain exploration, which requires profound expert knowledge. If a good solution has been found, there is a high probability that it does not work as well with other architectures or even the next hardware generation. Generative DSL-based approaches could mitigate these efforts and provide for an efficient exploration of algorithmic variants and hardware-specific tuning ideas. However, in vertically organized industries, such as automotive, suppliers are reluctant to introduce these techniques as they fear loss of control, high introduction costs, and additional constraints imposed by the OEM with respect to software and tool-chain certification. Moreover, suppliers do not want to share their generic solutions with the OEM, but only concrete instances. To this end, we propose a light-weight and incremental approach for meta programming of graphics applications. Our approach relies on an existing formulation of C-like languages that is amenable to meta programming, which we extend to become a lightweight language to combine algorithmic features. Our method provides a concise notation for meta programs and generates easily sharable output in the appropriate C-style target language.}, language = {en} } @inproceedings{LierMartinekStammingeretal., author = {Lier, Alexander and Martinek, Magdalena and Stamminger, Marc and Selgrad, Kai}, title = {A High-Resolution Compression Scheme for Ray Tracing Subdivision Surfaces with Displacement}, series = {Proceedings of the ACM on Computer Graphics and Interactive Techniques}, volume = {1}, booktitle = {Proceedings of the ACM on Computer Graphics and Interactive Techniques}, number = {2}, publisher = {The Association for Computers in Mathematics and Science Teaching}, doi = {10.1145/3233308}, pages = {1 -- 17}, abstract = {Subdivision surfaces, especially with displacement, are one of the key modeling primitives used in high-quality rendering environments, such as, e.g., movie production. While their use easily maps to rasterization-based frameworks, they pose a significant challenge for ray tracing environments. This is due to the fact that incoherent access patterns require storing or caching fully tessellated and displaced meshes for efficient intersection computations. In this paper we use a two-tier hierarchy built on a scene's patches. It relies on compressed and quantized bounding volumes on the second tier to reduce the size of the BVH itself. Based on this acceleration structure, we propose a quantized, compact approximation for leaf nodes while being faithful to the underlying patch-geometry. We build on recent advances and present a system that shows competitive performance regarding run-time speed, which is close to full-resolution pre-tessellation methods as well as to previous compression approaches. Ultimately, we provide strong compression of up to a factor of 5: 1 compared to state-of-the-art methods while maintaining high geometrical fidelity surpassing similarly compact approximations and getting close to uncompressed geometry.}, language = {en} } @inproceedings{BockWeiss, author = {Bock, Sebastian and Weiß, Martin Georg}, title = {Non-Convergence and Limit Cycles in the Adam Optimizer}, series = {Proceedings of the 28th International Conference on Artificial Neural Networks, 2019, Munich, Germany, September 17-19}, booktitle = {Proceedings of the 28th International Conference on Artificial Neural Networks, 2019, Munich, Germany, September 17-19}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-490}, pages = {232 -- 243}, abstract = {One of the most popular training algorithms for deep neural networks is the Adaptive Moment Estimation (Adam) introduced by Kingma and Ba. Despite its success in many applications there is no satisfactory convergence analysis: only local convergence can be shown for batch mode under some restrictions on the hyperparameters, counterexamples exist for incremental mode. Recent results show that for simple quadratic objective functions limit cycles of period 2 exist in batch mode, but only for atypical hyperparameters, and only for the algorithm without bias correction. We extend the convergence analysis to all choices of the hyperparameters for quadratic functions. This finally answers the question of convergence for Adam in batch mode to the negative. We analyze the stability of these limit cycles and relate our analysis to other results where approximate convergence was shown, but under the additional assumption of bounded gradients which does not apply to quadratic functions. The investigation heavily relies on the use of computer algebra due to the complexity of the equations.}, subject = {Neuronales Netz}, language = {en} } @inproceedings{StrasserWestner, author = {Strasser, Artur and Westner, Markus}, title = {Knowledge Transfer in IS Offshoring}, series = {Proceedings of the 19th Pacific Asia Conference on Information Systems (PACIS 2015) Singapore, July 5-9}, booktitle = {Proceedings of the 19th Pacific Asia Conference on Information Systems (PACIS 2015) Singapore, July 5-9}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-835}, pages = {1 -- 15}, abstract = {IS offshoring research regarding knowledge transfer processes, roles involved, as well as influencing factors is characterized by its diverse and heterogeneous nature. Covering the last fifteen years of IS offshoring research, this paper provides a consolidated view of the field of study. It presents a generic knowledge transfer process consisting of four stages and five milestones. These stages are characterized and evaluated according to their relevance for knowledge transfer, the types of knowledge transferred, the main activities and methods for transfer and testing, as well as the goals pursued. Furthermore, we aggregate the diverse literature findings relating to individuals who facilitate knowledge transfer processes into a general role. We label this role "offshore coordinator" and present its core tasks and necessary skills. In addition, we identify and cluster core factors that influence success or failure of knowledge transfer. In summary, our study answers calls to discontinue with empirically derived definitions in favor of theory-based conceptualization of the IS offshoring research field with respect to knowledge transfer processes, roles, and success factors. Future studies can build on these results and examine questions with respect to particular characteristics of knowledge transfer processes and their influencing success and failure factors.}, subject = {Betriebliches Informationssystem}, language = {en} }