6 Search Results for "H�lker, Franz"

Document
Short Paper
DOI: 10.4230/LIPIcs.GIScience.2023.63
Calculating Shadows with U-Nets for Urban Environments (Short Paper)

Authors: Dominik Rothschedl, Franz Welscher, Franziska Hübl, Ivan Majic, Daniele Giannandrea, Matthias Wastian, Johannes Scholz, and Niki Popper

Published in: LIPIcs, Volume 277, 12th International Conference on Geographic Information Science (GIScience 2023)

Abstract
Shadow calculation is an important prerequisite for many urban and environmental analyses such as the assessment of solar energy potential. We propose a neural net approach that can be trained with 3D geographical information and predict the presence and depth of shadows. We adapt a U-Net algorithm traditionally used in biomedical image segmentation and train it on sections of Styria, Austria. Our two-step approach first predicts binary existence of shadows and then estimates the depth of shadows as well. Our results on the case study of Styria, Austria show that the proposed approach can predict in both models shadows with over 80% accuracy which is satisfactory for real-world applications, but still leaves room for improvement.
Cite as

Dominik Rothschedl, Franz Welscher, Franziska Hübl, Ivan Majic, Daniele Giannandrea, Matthias Wastian, Johannes Scholz, and Niki Popper. Calculating Shadows with U-Nets for Urban Environments (Short Paper). In 12th International Conference on Geographic Information Science (GIScience 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 277, pp. 63:1-63:6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{rothschedl_et_al:LIPIcs.GIScience.2023.63,
  author =	{Rothschedl, Dominik and Welscher, Franz and H\"{u}bl, Franziska and Majic, Ivan and Giannandrea, Daniele and Wastian, Matthias and Scholz, Johannes and Popper, Niki},
  title =	{{Calculating Shadows with U-Nets for Urban Environments}},
  booktitle =	{12th International Conference on Geographic Information Science (GIScience 2023)},
  pages =	{63:1--63:6},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-288-4},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{277},
  editor =	{Beecham, Roger and Long, Jed A. and Smith, Dianna and Zhao, Qunshan and Wise, Sarah},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.GIScience.2023.63},
  URN =		{urn:nbn:de:0030-drops-189581},
  doi =		{10.4230/LIPIcs.GIScience.2023.63},
  annote =	{Keywords: Neural Net, U-Net, Residual Net, Shadow Calculation}
}
Document
Short Paper
DOI: 10.4230/LIPIcs.GIScience.2023.82
Harnessing the Sunlight on Facades - an Approach for Determining Vertical Photovoltaic Potential (Short Paper)

Authors: Franz Welscher, Ivan Majic, Franziska Hübl, Rizwan Bulbul, and Johannes Scholz

Published in: LIPIcs, Volume 277, 12th International Conference on Geographic Information Science (GIScience 2023)

Abstract
The paper deals with the calculation of the photovoltaic potential of vertical structures. Photovoltaic systems are a core technology for producing renewable energy. As roughly 50% of the population on planet Earth lives in urban environments, the production of renewable energy in urban contexts is of particular interest. As several papers have elaborated on the photovoltaic potential of roofs, this paper focuses on vertical structures. Hence, we present a methodology to extract facades suitable for photovoltaic installation, calculate their southness and percentage of shaded areas. The approach is successfully tested, based on a dataset located in the city of Graz, Styria (Austria). The results show the wall structures of each building, the respective shadow depth, and their score based on a multi-criteria analysis that represents the suitability for the installation of a photovoltaic system.
Cite as

Franz Welscher, Ivan Majic, Franziska Hübl, Rizwan Bulbul, and Johannes Scholz. Harnessing the Sunlight on Facades - an Approach for Determining Vertical Photovoltaic Potential (Short Paper). In 12th International Conference on Geographic Information Science (GIScience 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 277, pp. 82:1-82:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{welscher_et_al:LIPIcs.GIScience.2023.82,
  author =	{Welscher, Franz and Majic, Ivan and H\"{u}bl, Franziska and Bulbul, Rizwan and Scholz, Johannes},
  title =	{{Harnessing the Sunlight on Facades - an Approach for Determining Vertical Photovoltaic Potential}},
  booktitle =	{12th International Conference on Geographic Information Science (GIScience 2023)},
  pages =	{82:1--82:7},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-288-4},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{277},
  editor =	{Beecham, Roger and Long, Jed A. and Smith, Dianna and Zhao, Qunshan and Wise, Sarah},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.GIScience.2023.82},
  URN =		{urn:nbn:de:0030-drops-189777},
  doi =		{10.4230/LIPIcs.GIScience.2023.82},
  annote =	{Keywords: Vertical Photovoltaics, Facades, Southness, Multi-Criteria-Analysis, Shadow}
}
Document
DOI: 10.4230/DagRep.7.7.22
Citizen Science: Design and Engagement (Dagstuhl Seminar 17272)

Authors: Irene Celino, Oscar Corcho, Franz Hölker, and Elena Simperl

Published in: Dagstuhl Reports, Volume 7, Issue 7 (2018)

Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 17272 "Citizen Science: Design and Engagement". In this report, we detail the briefly summarise the content of three invited keynote talks and two invited tutorials. We further outline the findings of five parallel working groups, which met on the first and third day of the workshop, in the areas of: sustainability, measuring success, community engagement, linking and quality.
Cite as

Irene Celino, Oscar Corcho, Franz Hölker, and Elena Simperl. Citizen Science: Design and Engagement (Dagstuhl Seminar 17272). In Dagstuhl Reports, Volume 7, Issue 7, pp. 22-43, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{celino_et_al:DagRep.7.7.22,
  author =	{Celino, Irene and Corcho, Oscar and H\"{o}lker, Franz and Simperl, Elena},
  title =	{{Citizen Science: Design and Engagement (Dagstuhl Seminar 17272)}},
  pages =	{22--43},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2018},
  volume =	{7},
  number =	{7},
  editor =	{Celino, Irene and Corcho, Oscar and H\"{o}lker, Franz and Simperl, Elena},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagRep.7.7.22},
  URN =		{urn:nbn:de:0030-drops-84216},
  doi =		{10.4230/DagRep.7.7.22},
  annote =	{Keywords: Citizen science, Crowdsourcing, Data Analytics, Gamification, Human Computation, Incentives Engineering, Online Community, Open Science}
}
Document
DOI: 10.4230/DagSemProc.09261.30
The New Dutch Timetable: The OR Revolution

Authors: Dennis Huisman

Published in: Dagstuhl Seminar Proceedings, Volume 9261, Models and Algorithms for Optimization in Logistics (2009)

Abstract
On April 14, 2008, INFORMS (The Institute for Operations Research and Management Sciences) announced Netherlands Railways to be the winner of the 2008 Franz Edelman Award. In this extended abstract, we give a short summary of both the paper and the presentation of the winning team.
Cite as

Dennis Huisman. The New Dutch Timetable: The OR Revolution. In Models and Algorithms for Optimization in Logistics. Dagstuhl Seminar Proceedings, Volume 9261, pp. 1-3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{huisman:DagSemProc.09261.30,
  author =	{Huisman, Dennis},
  title =	{{The New Dutch Timetable: The OR Revolution}},
  booktitle =	{Models and Algorithms for Optimization in Logistics},
  pages =	{1--3},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9261},
  editor =	{Cynthia Barnhart and Uwe Clausen and Ulrich Lauther and Rolf H. M\"{o}hring},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.09261.30},
  URN =		{urn:nbn:de:0030-drops-21696},
  doi =		{10.4230/DagSemProc.09261.30},
  annote =	{Keywords: Timetable}
}
Document
DOI: 10.4230/DagSemProc.04441.4
04441 Working Group – Business Models

Authors: Birgitta König-Ries, Franz Lehner, Rainer Malaka, Florian Matthes, Philipp Obreiter, Key Pousttchi, Frank Seliger, Klaus Turowski, and Jari Veijalainen

Published in: Dagstuhl Seminar Proceedings, Volume 4441, Mobile Information Management (2005)

Abstract
This document presents the results from the working group "Business Models" (WG 1) discussing the seminar topic under market aspects. Main objectives were developing a shared view of the field (i.e. matching business, technology and research interests), identifying key players and relations between them (including barriers and lessons learned so far from the 2G/2.5G market), discussing the role of business models and value chains and applying them to P2P-networks. In the concluding round the difference between traditional DB/IS applications and mobile applications is explored.
Cite as

Birgitta König-Ries, Franz Lehner, Rainer Malaka, Florian Matthes, Philipp Obreiter, Key Pousttchi, Frank Seliger, Klaus Turowski, and Jari Veijalainen. 04441 Working Group – Business Models. In Mobile Information Management. Dagstuhl Seminar Proceedings, Volume 4441, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{konigries_et_al:DagSemProc.04441.4,
  author =	{K\"{o}nig-Ries, Birgitta and Lehner, Franz and Malaka, Rainer and Matthes, Florian and Obreiter, Philipp and Pousttchi, Key and Seliger, Frank and Turowski, Klaus and Veijalainen, Jari},
  title =	{{04441 Working Group – Business Models}},
  booktitle =	{Mobile Information Management},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4441},
  editor =	{Margaret H. Dunham and Birgitta K\"{o}nig-Ries and Evaggelia Pitoura and Peter Reiher and Can T\"{u}rker},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.04441.4},
  URN =		{urn:nbn:de:0030-drops-1699},
  doi =		{10.4230/DagSemProc.04441.4},
  annote =	{Keywords: Business Models}
}
Document
DOI: 10.4230/DagSemProc.04441.9
Mobile Business and Services - A systematic, business oriented approach

Authors: Franz Lehner

Published in: Dagstuhl Seminar Proceedings, Volume 4441, Mobile Information Management (2005)

Abstract
In terms of business models, mobile commerce (MC) includes relations between customers, operators, ecommerce providers, payment providers, and other parties. There is a growing number of publications on MC sometimes labeled as research. But most of this work should be better called market studies or benchmarks. They highlight different aspects such as the number of prospective consumers, the estimated market volume, etc which do not really provide deeper insights . Well known sources for this kind of information are Arthur D. Little, Ovum, Durlacher, Merrill Lynch, Gartner, Forrester and others. They all try to estimate the perspectives of the mobile market(s) by using figures on mobile phone penetration, SMS usage, mobile internet access etc. Many of the remaining publications are technically oriented (for an overview see e.g. Prasad et al. 2000, Muller-Veerse 2000, Webb 1999). So what we are generally missing are concepts and guidelines for developing the mobile business, which something the MIS field can undertake. It is the purpose of this paper to contribute to a solution by providing a structured view of the major areas from a business point of view.
Cite as

Franz Lehner. Mobile Business and Services - A systematic, business oriented approach. In Mobile Information Management. Dagstuhl Seminar Proceedings, Volume 4441, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{lehner:DagSemProc.04441.9,
  author =	{Lehner, Franz},
  title =	{{Mobile Business and Services - A systematic, business oriented approach}},
  booktitle =	{Mobile Information Management},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4441},
  editor =	{Margaret H. Dunham and Birgitta K\"{o}nig-Ries and Evaggelia Pitoura and Peter Reiher and Can T\"{u}rker},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.04441.9},
  URN =		{urn:nbn:de:0030-drops-1631},
  doi =		{10.4230/DagSemProc.04441.9},
  annote =	{Keywords: Mobile Business}
}
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