Prof. Dr. Stephen Wittkopf Stephen Wittkopf

Wittkopf, Stephen (Hrsg.). (2007). PLEA 2007: Sun, Wind and Architecture. Singapore: Research Publishing Services Singapore.

Wittkopf, Stephen & Xu, Ran (2014). Reflection from PV facades and roofs - New assessment methods based on annual weather data. Proceedings of EUPVSEC, 2014(29th European PV Solar Energy Conference and Exhibition (Amsterdam)), 3548-3552.

Wittkopf, Stephen (06.12.2012). Solar fraction Charts for urban planning in Singapore. Proceedings of 7th Energy Forum on Solar Building Skins, 2012, 111-117.

Wittkopf, Stephen; Okuda, S & Yang, X. (2012). Equalizing Daylight Distribution Digital Simulation and fabrication of optimized inner reflectors and bottom extractors for a light-duct. Digital Physicality - Proceedings of the 30th eCAADe Conference, (1), 607-612.

Hendarti, R.; Wong, N.; Reindl, T.; Tan, Puayyok; Wittkopf, Stephen & Chan, Weilin (2012). Integration of Solar Photovoltaic and Green Roofs in Tropical Climate. Proceedings of INTA, (4th International Conference (Singapore)), 236-241.

Hendarti, R.; Sun, Weimeng; Wittkopf, Stephen & Wong, N. (2012). A Simulation Study of Thermal Impacts of Greenery on a PV Rooftop. Proceedings of ISES, 2012(1st Solar World Congress (Kassel)), 81-90.

Ng, Poh Khai; Nalani, Mithraranate & Wittkopf, Stephen (2012). Semi-Transparent Building- Integrated Photovoltaic Windows: Potential Energy Savings of Office Buildings in Tropical Singapore. Proceedings of PLEA Conference, 2012(28th International Conference (Lima)), 145-149.

Wittkopf, Stephen; Pandey, Anupama; Huang, Yixiang; Nandar, L.; Ang, K.S; Prasad, D.; Scartezzini, J.-L. & Toh, P.S. (28.03.2010). Building integrated photovoltaic of Singapore`s zero-energy building. Proceedings of International Conference on Applied Energy (ICAE), 2010, 98-104.

Wittkopf, Stephen; Khambadkone, A.M.; He, Q. & Ng, P.K. (27.07.2009). Development of a solar Radiation and BIPV design tool as Energy Plus plug-in for Google Sketch UP. Proceedings of Building Simulation, 2009(11 International IBPSA Conference (Glasgow)), 1989-1996.

Lau, S.S.Y.; Baharuddin, B. & Wittkopf, Stephen (22.11.2007). The use of anidolic lighting System in improving daylight illuminance of high-rise buildings in Hong Kong. Proceedings of PLEA Conference, 2007(24th International Conference (Singapore)), 389-395.

Darula, Stanislav; Kittler, Richard & Wittkopf, Stephen (03.09.2006). Outdoor illuminance levels in the tropics and their representation in Virtual Sky Domes. Architectural Science Review, 2006(3), 301-313.

Wittkopf, Stephen (2006). I3-Eye-Cube: interactive intuitive mixed reality interface for virtual architecture. Proceedings of ASCAAD, 2006(2nd International Conference), 230-236.

Wittkopf, Stephen (2005). Evaluation of Virtual Sky Domes for the prediction of daylight performance with radiosity-based light simulation software. Architectural Science Review, 2005(48(2)), 173-177.

Wittkopf, Stephen (2004). A method to construct Virtual Sky Domes for use in standard CAD-based light simulation software. Architectural Science Review, 2004(47(2)), 275-286.

Wittkopf, Stephen & Foo, E.J (17.09.2003). Discussing image-based modeling Technology for 3D digital archival of physical architecture models. Proceedings of ECAADE, 2003(21th eCAADe Conference (Graz)), 373-380.

Wittkopf, Stephen & Hee, H. (17.09.2003). Design by Grading? Electronic Buildability Design Appraisal Score (eBDDAS) as a Major Design Consideration in Architectural Design in Singapore. Proceedings of ECAADE, 2003(21th eCAADe Conference (Graz)), 111-116.

Wittkopf, Stephen & Foo, E.-J. (30.05.2003). Challenges of using image-based modeling tool within the architectural design process. Proceedings of CAADRIA, 2003(8th International Conference (Bangkok)), 597-612.

Wittkopf, Stephen & Huang, Yixiang (03.05.2003). Web-based computational design Support Tools - Use of lighting and energy Performance Simulation and web-based visualization for energy integrated architectural design. Proceedings of CAADRIA, 2003(8th International Conference (Bangkok)), 308-322.

Wittkopf, Stephen & Foo, E.-J. (03.05.2003). Challenges of using image-based modeling tool within the architectural design process. CAADRIA, 5.

Wittkopf, Stephen; Huang, Yixiang & Boey, M.K. (28.04.2003). Discussing photon-mapping and radiosity-based Rendering algorithms to evaluate qualitative lighting design in contemporary architecture. Proceedings of CAAD Futures, 2003(10th International Conference (Tainan)), 351-360.

Wittkopf, Stephen (21.11.2001). I-light, A Web-based learning System for Architectural Lighting Design. Proceedings of ANZASCA, 99.

Wittkopf, Stephen (10.5.2018). Schön viel Strom produzieren - Das SCCER Kompetenzzentrum für Gebäude und Areale informiert. Haustech, 2018(5), 58-58.

Wittkopf, Stephen & Simon, Axel (20.1.2018). Kopfschütteln und anpacken. Hochparterre: Zeitschrift für Architektur und Design, 2018(Solaris 1), 18-23.

Wittkopf, Stephen (2017). Farbige Solarmodule kommen als Fassadenelemente zum Einsatz. Der schweizerische Hauseigentümer: offizielles Organ des Schweizerischen Hauseigentümerverbandees / Hrsg.: Schweiz. Hauseigentümerverband, Zürich, 2017(Ausgabe Nr 16), 19-19.

Wittkopf, Stephen (31.08.2016). Schön Strom produzieren mit farbigen Solarpanels. 20 Minuten, 1-1.

Wittkopf, Stephen (2016). Schön viel Strom produzieren: Farbige PV-Lösungen. Baurundschau, 2016(04/2016), 100-101.

Knopf, Dietmar & Wittkopf, Stephen (15.03.2015). Unsichtbare Solarmodule. Immobilia, 36-37.

Wittkopf, Stephen & Monika, Gold (2015). Schön viel Strom produzieren. Magazin Hochschule Luzern, 44-45.

Wittkopf, Stephen (13.05.2014). Photovoltaik in neuem Licht. Nachhaltig Bauen in der Zentralschweiz, 2014(1), 4-6.

Wittkopf, Stephen (2013). Planungshilfe für solare Fassaden. Bau und Architektur, 2013(2), 29-30.

Wittkopf, Stephen & Grobe, Lars Oliver (2013). Klimabasierte Tageslichtsimulation als Planungshilfe für solare Fassaden. Intelligent bauen: Fachzeitschrift für vernetztes und nachhaltiges Planen, Bauen und Bewirtschaften, 2013(3), 28-30.

Wittkopf, Stephen (2012). Fotovaltaik in neuem Licht. Electroswiss Bulletin, 5-7.

Wittkopf, Stephen (2012). Building Integrated Photovoltaics - case study, challenges and developments. Technology Primers, Singapore: Roof and Facade, 2-4.

Wittkopf, Stephen (2011). BIPV to AIPV. PV Magazine, Berlin, 12-14.

Wittkopf, Stephen & Basu, R. (2006). Solar power tested as a viable energy source. The Straits Times, 4-4.

Wittkopf, Stephen & Basu, R. (2005). Costly to go green? It`s cheaper than you think! The Straits Times, 3-3.

Wittkopf, Stephen & Tan, C. (2005). Sunny S`pore ripe for solar power. The Straits Times, 3-3.

Wittkopf, Stephen & Basu, R. (2005). Singapore to open its first solar cell manufacturing plant. The Straits Times, 4-4.

Grobe, Lars Oliver; Wittkopf, Stephen & Kazanasmaz, Zehra Tuğçe (2017). High-resolution data-driven models of daylight redirecting components. In Aslıhan Tavil; Oğuz Cem Çelik (Hrsg.), ICBEST Istanbul: Interdisciplinary Perspectives for future building envelopes (S. 84-93). Istanbul: Istanbul Technical University.

Yang, Xiaoming; Grobe, Lars Oliver & Wittkopf, Stephen (2013). Simulation of reflected daylight from building envelopes. In International Building Performance Simulation Association (IBPSA) (Hrsg.), Proceedings of 13th Conference of International Building Performance Simulation Association (S. 3673-3680). Chambery, France: IBPSA.

Wittkopf, Stephen (2012). Envelopes and Solar Energy. Proceedings of Facade 2012 - Conference on Building Envelopes (S. 36-44). Lucerne, Switzerland: European Facade Network.

Wittkopf, Stephen (2012). Singapore Zero Energy Office Building. In BRENET (Hrsg.), Proceedings of 17. BRENET Status Seminar (S. 4-8). Zürich, Switzerland: BRENET.

Ng, Poh Khai; Wittkopf, Stephen & Sun, Weimeng (2011). Modelling the impact of glazing selection on daylighting performance of an office building in Singapore using EnergyPlus. In IBPSA (Hrsg.), Proceedings of 12th Conference of International Building Performance Simulation Association (S. 1161-1167). Sydney, Australia: IBPSA.

Wittkopf, Stephen (2011). Solar Energy Research Institute of Singapore - Annual Report. In Solar Energy Research Institute of Singapore (Hrsg.), Solar Energy Research Institute of Singapore (S. 127-129). Singapore: NUS.

Lipi, M. & Wittkopf, Stephen (2011). Investigation of IR and UV Transmittance of Sunshade Films. In SERIS (Hrsg.), Annual Report, Solar Energy Research Institute of Singapore (SERIS) (S. 3-5). Singapore: NUS.

Wittkopf, Stephen (2011). 2.1 Solar and Energy Efficient Buildings. In SERIS (Hrsg.), Solar Energy Research Institute of Singapore (SERIS) (S. 3-5). Singapore: NUS.

Wittkopf, Stephen & Valliappan, Selvam (2011). BIPV of Singapore`s Zero-Energy Building. In SERIS (Hrsg.), Annual Report, Solar Energy Research Institute of Singapore (SERIS) (S. 3-5). Singapoer: NUS.

Walsh, T.M.; Khoo, Y.S.; Nandar, L. & Wittkopf, Stephen (2011). Singapore Solar Spectrum Measurement. In NUS (Hrsg.), Annual Report, Solar Energy Research Institute of Singapore (SERIS) (S. 2-4). Singapore: NUS.

Wittkopf, Stephen (2010). Analysis of building facade elements. In SERIS (Hrsg.), Annual Report Solar Energy Research Institute of Sinagpore (SERIS) (S. 1-3). Singapore: NUS.

Wittkopf, Stephen; Pandey, Anupama & Nandar, L. (2010). Building Integrated Photovoltaics od Singapore`s Zero-Energy Building. In SERIS (Hrsg.), Annual Report Solar Energy Research Institute of Singapore (SERIS) (S. 2-4). Singapore: NUS.

Wittkopf, Stephen & Grobe, Lars O. (2010). Optical charecterisation of materials and structures for daylighting and PV applications. In SERIS (Hrsg.), Annual Report Solar Energy Research Institute of Singapore (SERIS) (S. 5-7). Singapore: NUS.

Wittkopf, Stephen (2010). Solar and Energy Efficient Buildings. In SERIS (Hrsg.), Annual Report Solar Energy Research Institute of Singapore (SERIS) (S. 3-5). Singapore: NUS.

Wittkopf, Stephen; Pandey, Anupama; Grobe, Lars Oliver & Borsuit, Apiparn (2009). Demonstration and test bedding of four glazing types in daylight test chambers in Singapore. In Glass Performance Days (Hrsg.), Proceedings of Glass Performance Days (S. 1-8). Tampere, Finland: Proceedings of Glass Performance Days.

Wittkopf, Stephen (2009). Solar and Energy Efficient Buildings Cluster. In SERIS (Hrsg.), Annual Report Solar Energy Research Institute of Singapore (SERIS) (S. 3-5). Singapore: NUS.

Tan, TianChong; Wittkopf, Stephen & Fan, Jiang (2008). Photovoltaic Systems in Buidlings. In Building Construction Authority of Singapore (Hrsg.), Green Handbook (S. 1-35). Singapore: BCA.

Wittkopf, Stephen (2007). Building Integrated Photovoltaics. Innovation 7, No. 3 (Sustainable Energy) (S. 20-22). Singapore: Innovation.

Tan, B.K. & Wittkopf, Stephen (2007). Sun, Wind and Architecture. In NUS, Department of Architecture (Hrsg.), Report International Conference on Passive and Low-Energy Architecture (S. 867-869). Singapore: NUS.

Wittkopf, Stephen & Yuniarti, Erika (2006). Towards designing a low energy responsive facade for commercial buildings in Singapore by integrating photovoltaic and anidolic systems. In NUS, Department of Architecture (Hrsg.), Research Report for Centre for Advanced Studies in Architecture (S. 205-207). Singapore: NUS.

Wittkopf, Stephen; Soon, Lay Kuan; Yuniarti, Erika & Grobe, Lars Oliver (2006). Virtual Sky Domes - Making the CIE/ISO Standard General Sky available for CAD-based light simulation software. In International Building Performance Simulation Association (IBPSA) (Hrsg.), Proceedings of Building Performance Simulation Conference (S. 41-48). Toronto, Kanada: International Building Performance Simulation Association (IBPSA).

Wittkopf, Stephen (2005). Building Integrated Photovoltaics in Singapore. In NUS (Hrsg.), Executive Summary Research Report for National Energy Efficiency Committee (S. 2-4). Singapore: NUS.

Wittkopf, Stephen (2004). Web-based Digital Archive of Selected Architecture Students`Projects. In NUS (Hrsg.), CDTLink (Center for Development Teaching and Learning, Singapore) (S. 2-4). Singapore: NUS.

Wittkopf, Stephen (2004). Potential of Building Integrated Photovoltaics in existing urban high rise housing in Singapoer. In NUS, Department of Architecture (Hrsg.), Research Report for Centre for Advanced Studies in Architecture (S. 147-149). Singapore: NUS.

Wittkopf, Stephen (2003). I-Light 2 - Design guide for energy efficient qualitative lighting design in urban housing. In NUS (Hrsg.), Research Report for Centre for Advanced Studies in Architecture (S. 130-135). Singapore: NUS.

Wittkopf, Stephen & Ho, M. (2003). Virtual CAD Models of Public Housing in Singapore. In Wittkopf, Stephen (Hrsg.), Interactive e-Learning Websites for Architecture (S. 12-14). Singapore: NUS, Department of Architecture.

Wittkopf, Stephen & Tay, Y.L. (2003). Parametric intelligence in design – Skyscraper Design teaching. Developing Digital Architecture (S. 179-181). Basel: Birkäuser.

Wittkopf, Stephen & Lee, L.T. (2003). Coexistence of Physical and Virtual Cities – Lighting Design". Developing Digital Architecture (S. 198-201). Basel: Birkhäuser.

Wittkopf, Stephen; Ho, M. M. & Leung, Y.W. (2003). Parametric Design Studies of Public Housing in Singapore. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Websites for Architecture, vol. 7 (S. 3-5). Singapore: NUS.

Wittkopf, Stephen; Leung, Y.W. & Ho, M.M (2003). Advanced Design Optimization of Public Housing in Singapore. In NUS, Department of Architecture (Hrsg.), Interactive e-learning Websites for Architecture, vol.8 (S. 6-8). Singapore: NUS.

Wittkopf, Stephen; Huang, Yixiang; Leow, T.L. & Tay, Y.L. (2002). Light and Energy in Architecture. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Websites for Architecture, vol. 5 (S. 11-13). Singapore: NUS.

Wittkopf, Stephen; Leow, T.L. & Tay, Y.L. (2002). 2nd Interactive Ranking Website - Shophouse Design Teaching. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Websites for Architecture, vol.2 (S. 12-13). Singapore: NUS.

Wittkopf, Stephen; Lui, H.; Tay, Y.L. & Tay, K.S. (2002). Visual Impact of Daylight in Tropical Architecture. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Website for Architecture, vol.4 (S. 5-7). Singapore: NUS.

Wittkopf, Stephen; Tay, Y.L. & Leow, T.L. (2002). 1st Interactive Ranking Website - Skyscraper Design Teaching. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Websites for Architecture, vol. 1 (S. 3-6). Singapore: NUS.

Wittkopf, Stephen; Tay, Y.L. & Leow, T.L. (2002). Computer Aided Architectural Lighting Design. In NUS, Department of Architecture (Hrsg.), Interactive e-Learning Websites for Architecture, vol. 3 (S. 1-3). Singapore: NUS.

Wittkopf, Stephen (2002). First Interactive Ranking Website for Skyscraper Design Teaching. In Kong Hui Yi, NUS, CIT (Centre for Instructional Technology) (Hrsg.), IDEAS - Instructional Development, Enhancement and Support by Centre for Instructional Technology (S. 3-6). Singapore: NUS.

Wittkopf, Stephen; Tan, S.L. & Lai, S.H. (2002). Form Z. Joint Study Program Report. In Chris I. Yessios, comp. Martin Demczyk, Bill Jordan, Harald Gebel (Hrsg.), Joint Study Report 10 (S. 160-164). Singapore: SERIS.

Wittkopf, Stephen (2001). The use of Digital Design Media at the Department of Architecture. In NUS (Hrsg.), CDTL Link, Vol. 5, No.3 (S. 3-5). Singapore: NUS.

Wittkopf, Stephen (2000). Digital Lighting Simulation. Professisonal Lighting Design, no. 4 (S. 44-49). United States: NUS.

Wittkopf, Stephen (1998). CAD in der Architektur Neue Medien – Neue Instrumente. Architektur der fuenfziger Jahre – Die Darmstaedter Meisterbauten (S. 154-157). Stuttgart: Karl Kraemer Verlag.

Küng, Robert; Studer Korevaar, Cyrill; Gürtler Berger, Theresia; Vogler, Benno; Wittkopf, Stephen & Kunz, Stefan (2018). Richtlinie Solaranlagen (Bericht). Kanton Luzern, Bau-, Umwelt- und Wirtschaftsdepartement, Luzern.

Wittkopf, Stephen (2018). Photovoltaik wird bunt - SWISSPANEL SOLAR: Mehrfarbiger Digitaldruck auf Photovoltaik Glas (Pressemitteilung Glas Trösch). Glas Trösch, Bützberg/Basel.

Wittkopf, Stephen; Summermatter, Samuel & Xu, Ran (2015). Design of a photovoltaic sliding shutter: Pilot and Demonstration project (Annual Report 2015 Bundesamt für Energie BFE). NET Nowak Energie & Technologie AG,

Wittkopf, Stephen & Gold, Monika (2015). Coloured pattern for PV modules: Proof-of-concept (Annual Report 2015). Bundesamt für Energie BFE, Ursen.

Wittkopf, Stephen (2015). PV facades: Design and test bedding (Annual Report 2015). Bundesamt für Energie BFE,

Wittkopf, Stephen (2005). Renewable Energies – Potential for Solar Power in Singapore (Research Report Ministry of Environment and Water Resources Singapore).

Wittkopf, Stephen (2004). Daylight Performance of the new National Library Building (Technical Consultancy Report Singapore No. 3). National Library Board, Singapore.

Wittkopf, Stephen (2003). Daylight Assessment Simulation (Technical Consultancy Report Singapore No. 1). CPG Coproration Pte. Ltd., Singapore.

Wittkopf, Stephen (2003). Daylight Assessment of Design Options (Technical Consultancy Report Singapore No. 2). Chao Tse Ann Architects, Singapore.

Wittkopf, Stephen (2003). Singapore Clarke Quay - Daylighting Performance Analysis of Proposed Riverfront and Streetscape Design (Technical Consultancy Report No. 4). Capital and Commercial, Singapore.

Wittkopf, Stephen (2001). I-Light, ein webbasiertes Lernsystem zum Entwerfen mit Licht.. Dissertation, University of Technology - Dept. of Architecture, Darmstadt, Germany, Germany.

Wittkopf, Stephen (21.01.2015). Das Forschungsprojekt Active Interfaces als Beispiel des Nationalen Förderprogramms des Schweizerischen Nationalfonds (SRF2: Kontext) [Radiosendung].

Wittkopf, Stephen; Pandey, Anupama & Nandar, L. (2010). Building Integrated Photovoltaics (BIPV) of Singapore's Zero-Energy Building.

Wittkopf, Stephen & Grobe, Lars O. (2010). Optical characterisation of materials and structures for daylighting and PV applications.

Wittkopf, Stephen (15.11.2023). Zukunft - Wissens- und Innovationstransfer. Innovationsfest 20 Jahre InnoPark Baar, InnoPark Region Zentralschweiz, Baar.

Schregle, Roland & Wittkopf, Stephen (03.09.2020). Kronos: A Visual Analytics Controlling Tool. CARF Luzern 2020, Luzern (Zoom).

Grobe, Lars Oliver; Terwilliger, Michaela & Wittkopf, Stephen (26.08.2020). Designing the colour, pattern and specularity of building integrated photovoltaics. Architecture, Technology and Innovation ATI 2020, Izmir, TR.

Wittkopf, Stephen (19.04.2018). Farbige Photovoltaik für die Gebäudeintegration. Brownbag-Lunch "Sonnenwende": Solarfassaden mit GFT Fassaden AG, Zürich.

Wittkopf, Stephen (20.09.2017). Die Energiefassade. Fallbeispiele. Symposium Bauwerk - Tragwerk- Energie, Kaiserslautern.

Wittkopf, Stephen (05.09.2017). Schön viel Strom produzieren. PV@Universities of Applied Science, Bern.

Wittkopf, Stephen (30.08.2017). Architekturintegrierte Photovoltaik. Forschung und Praxis. Energieapéro Graubünden, Chur/Poschiavo.

Wittkopf, Stephen (30.05.2017). Architekturintegrierte PV: Praxisbezug des Nationalen Forschungsprogramms Energiewende. Solar Update, Olten.

Wittkopf, Stephen (27.04.2017). BIM für die Gebäudehülle? Fachtagung Steildach, Zürich-Regensdorf.

Wittkopf, Stephen (22.03.2017). Schön viel Strom produzieren: Farbige Photovoltaik Fassaden. ZIG Planer Seminar, Hochschule Luzern T&A.

Roeske, Christian & Wittkopf, Stephen (07.03.2017). Farbige PV- Module: Technologien, Typen und Anwendungen. 9 Forum Bauwerksintegrierte Photovoltaik, Bad Staffelstein.

Wittkopf, Stephen (20.10.2016). Energy Challenge 2016- Von der Sonne in den Tank. Transfer Transparent, Hochschule Luzern T&A, Horw.

Wittkopf, Stephen (30.09.2016). Farbige Photovoltaik Fassaden: Produkte und Projekte. Messe Bauen und Wohnen, Luzern.

Wittkopf, Stephen (27.09.2016). Farbige Photovoltaik Fassaden. Innovationsgruppe Plus Energie Gebäude, Neuchatel.

Wittkopf, Stephen (09.05.2016). Architektonische Gestaltung mit Photovoltaik: Neue Anwendungsmöglichkeiten. Energie Apero Luzern, Luzern.

Wittkopf, Stephen (25.04.2016). Interdisziplinäre Forschung für die Energiewende: Fallbeispiel Architekturintegrierte Photovoltaik. Forum Schweizer Energieeffizienzmanagement, Hannovermesse.

Wittkopf, Stephen (23.01.2016). Seminar TC BIPV Standardization. Winter Conference 2016, Orlando, Florida.

Xu, Ran & Wittkopf, Stephen (12.01.2016). Solare Fassaden - Schön viel Strom produzieren. Swissbau 2016, Basel, Schweiz.

Wittkopf, Stephen (12.11.2015). Fassadenintegrierte Photovoltaik. Abend der Wirtschaft, Horw.

Grobe, Lars Oliver; Müllner, Katrin; Meyer, Björn & Wittkopf, Stephen (28.10.2015). A novel data-driven BSDF model to assess the performance of a daylight redirecting ceiling panel at the Calgary Airport Expansion. PLDC 5th Global Lighting Design Convention, Rome.

Wittkopf, Stephen (11.11.2014). Architektonische PV Module von morgen. Abend der Wirtschaft, Luzern, Schweiz.

Wittkopf, Stephen & Krehel, M (04.11.2014). BSDF Measurement with a scanning Goniophotometer. BRDF Workshop, Nürnberg, Germany.

Xu, Ran & Wittkopf, Stephen (22.09.2014). Screened Photovoltaic Façade (Design studies with visually hidden PV modules on architecture facades). EU PVSEC 2014, Amsterdam, Niederlande.

Xu, Ran & Wittkopf, Stephen (22.09.2014). Reflection from PV facades and roofs – New assessment methods based on annual weather data. EU PVSEC 2014, Amsterdam, Niederlande.

Noback, Andreas & Wittkopf, Stephen (02.09.2014). Complex Material Models in Radiance. 13th Radiance Workshop, London.

Schregle, Roland & Wittkopf, Stephen (01.09.2014). Recent Developments in Photon Mapping. 13th International RADIANCE Workshop, London.

Grobe, Lars Oliver; Müllner, Katrin & Wittkopf, Stephen (01.09.2014). Measurement and Modeling of a Daylight Redirecting Component. 13th International Radiance Workshop, London.

Wittkopf, Stephen (03.04.2014). Solare Fassaden – Technik und Architektur. Verband Gebäudehülle, Olten, Switzerland.

Wittkopf, Stephen (14.02.2014). Architektur Integrierte Fotovoltaik AIPV. Fachtagung BE NETZ, Ebikon, Schweiz.

Wittkopf, Stephen (31.01.2014). Solar Facades – Engineering and Architecture. 3rd Workshop BMWi Research Funding Novascope Building Intelligence, Weimar, Germany.

Wittkopf, Stephen (31.01.2014). Solar Facades – Engineering and Architecture. 3rd Workshop BMWi Research Funding Novascape Building Intelligence, Weimar, Germany.

Wittkopf, Stephen (22.01.2014). Solare Fassaden – Technik und Architektur: Architektur integrierte Fotovoltaik. Swiss Bau, Basel, Switzerland.

Xu, Ran & Wittkopf, Stephen (22.01.2014). Solare Fassaden – Technik und Architektur: Visuelle Beurteilung. Swiss Bau, Basel, Switzerland.

Wittkopf, Stephen & Grobe, Lars O. (22.01.2014). Solare Fassaden – Technik und Architektur: Tageslichtlenkung. Swiss Bau, Basel, Switzerland.

Wittkopf, Stephen & Grobe, Lars O. (05.11.2013). Daylight assessment of facade designs. 8th Energy Forum on Solar Building Skins, Brixen, Italy.

Wittkopf, Stephen (27.09.2013). Architekturintegrierte Fotovoltaik. Messe Luzern, Bauen und Wohnen, Luzern, Switzerland.

Wittkopf, Stephen (04.09.2013). Energiewende und Denkmalschutz – Architektur Integrierte Fotovoltaik. Europäische Tage des Denkmals im Kanton Luzern, Luzern, Switzerland.

Wittkopf, Stephen (06.05.2013). Architektur Integrierte Fotovoltaik. Energie Apéro Luzern, Luzern, Switzerland.

Hendarti, R.; Wong, N.; Reindl, T. & Wittkopf, Stephen (12.12.2012). Integration of Solar Photovoltaic in tropical climates. 4th inta conference, Singapore.

Wittkopf, Stephen (06.12.2012). Solar fraction charts for urban planning in Singapore. 7th Energy Forum on Solar Building Skins, Brixen, Italy.

Wittkopf, Stephen (16.11.2012). Solare Gebäudehüllen. Abend der Wirtschaft, Horw, Switzerland.

Ng, P.K.; Mithraratne, N. & Wittkopf, Stephen (07.11.2012). Semi-Transparent Building- Integrated Photovoltaic Windows: Potential Energy Savings of Office Buildings in Tropical Singapore. PLEA 2012 -28th Conference on Passive and Low Energy Architecture, Lima, Peru.

Wittkopf, Stephen (23.10.2012). From building integrated photovoltaics (BIPV) to architecture integrated photovoltaics (AIPV). PV Asia Pacific Conference, Singapore.

Wittkopf, Stephen (12.09.2012). Building envelopes often reflect sunlight to the neighbouring area and cause glare problems. 11th International Radiance Workshop, Copenhagen, Denmark.

Wittkopf, Stephen & Grobe, Lars O. (12.09.2012). Complex fenestration & Radiance – a reality check from a user`s point of view. 11th International Radiance Workshop, Copenhagen, Denmark.

Wittkopf, Stephen (04.09.2012). Solar Energie Fassade. RUAG Mitarbeiterschulung, Sempach, Switzerland.

Wittkopf, Stephen (09.01.2012). Glass Technologies and Zero Energy Buildings. Flat Glass International 2012, Singapore.

Wittkopf, Stephen & Teja Sukardi, J. (30.11.2011). Solar fraction charts for urban planing in Singapore. AuSES: 49th Annual Australian Solar Energy Society`s Conference, Sydney, Australia.

Ng, Poh Khai; Wittkopf, Stephen & Sun, Weimeng (14.11.2011). Modelling the impact of glazing selection on daylighting performance of an office building in Singapore using EnergyPlus. 12th Conference of International Building Performance Simulation Association, Sydney, Australia.

Wittkopf, Stephen (13.10.2011). Von Europa bis Asien - Fenster, Fassaden, Glas und Materialien für neue Märkte in tropischen Megacities. Fenstertage Rosenheim, Rosenheim, Germany.

Hendarti, R.; Wittkopf, Stephen; Wong, N. & Sun, W. (28.08.2011). Simulation study on thermal impact of greenery on a PV roof top. The International Solar Energy Society (ISES) Solar World Congress 2011, University of Kassel, Germany.

Wittkopf, Stephen (22.02.2011). Solar energy in tropical buildings - Case study on Singapore's first Zero-Energy building. 2nd Annual Green Buildings Asia - IBC Asia Conference, Singapore.

Wittkopf, Stephen (01.12.2010). BIPV - Simulation and Measurement. 5th Energy Forum - Solar Architectuer and Solar buildings, Brixen, Italy.

Wittkopf, Stephen (01.11.2010). Solar Energy in tropical buildings. Clean Energy Expo 2010 - Energy for the future, Singapore.

Sun, W.; Ng, P.K. & Wittkopf, Stephen (27.06.2010). Performance evaluation of selected PV arrays in a zero-energy building in Singapore. Renewable Energy 2010, Yokohama, Japan.

Wittkopf, Stephen (10.05.2010). Solar and Energy Efficient Buildings. Career Talk at NTU, Singapore.

Pandey, Anupama; Wittkopf, Stephen; Huang, Yixiang; Nandar, L.; Ang, K.S; Prasad, D.; Scartezzini, J.-L. & Toh, P.S. (21.04.2010). Building integrated photovoltaic of Singapore’s zero-energy building. International Conference on Applied Energy (ICAE), Singapore.

Wittkopf, Stephen (28.03.2010). Gaining insights into the essentials of design, materials and technology to achieve the goal of having 'net-zero building`. 2nd Annual Global Construction Technologies and Building Materials, Doha, Qatar.

Wittkopf, Stephen (21.02.2010). Solar Architecture in tropical Singapore: PV, daylight and built case studies. The China Decision Makers Consultancy - Event BIPV Summit, Shanghai, China.

Wittkopf, Stephen (02.12.2009). Solar Architecture in tropical Singapore - Photovoltaic, daylight and built case studies. 4th Energy Forum on Solar Archicecture and Urban Planning, Bressanone, Italy.

Wittkopf, Stephen (16.11.2009). Multifunctional Photovoltaic Facades. 2nd MPVF workshop, Singapore.

Wittkopf, Stephen (16.11.2009). R&D at Solar Energy Research Institute of Singapore. Clean Energy Expo 2009, Shangri La Hotel, Singapore.

Wittkopf, Stephen & Luther, J. (26.10.2009). Solar and Energy Efficient Buildings - Potential and Technologies. International Green Building Conference - Build Green. The Future is now, Singapore.

Linhart, Friedrich; Wittkopf, Stephen & Scartezzini, J.-L. (02.09.2009). High Performance High Performance integrated lighting systems: Recent achievements within the framework of the "Green Lighting" Project of the ‘Green Lighting’ Project. CISBAT 2009: International Scientific Conference - Renewables in a changing climate, Lausanne, Switzerland.

Linhart, Friedrich; Wittkopf, Stephen & Scartezzini, J.-L. (02.09.2009). High Performance integrated lighting systems. CISBAT 2009: International Scientific Conference - Renewables in a changing climate, Lausanne, Switzerland.

Linhart, Friedrich; Wittkopf, Stephen; Muench, M.Y. & Scartezzini, J.-L. (02.08.2009). Splitting up an Anidolic Daylighting System into small pieces. SPIE: International Society for Optics and Photonics, 2009, San Diego, United States.

Wittkopf, Stephen; Khambadkone, A.M.; He, Q. & Ng, P.K. (27.07.2009). Development of a solar radiation and BIPV design tool as Energy Plus plug-in for Google Sketch Up. Building Simulation 2009 by IBPSA, Glasgow.

Zhou, Z.; Jayashree, K.; Hii, J.C.D.; Schneider, M.; Lu, W. & Wittkopf, Stephen (19.07.2009). Robust Pose Estimation for Outdoor Mixed Reality with Sensor Fusion. HCI: Human - Computer - Interaction International, 2009, San Diego, California.

Wittkopf, Stephen (27.05.2009). Reflexions Energetiques. LAURE Energy Conference, Lausanne, Switzerland.

Wittkopf, Stephen (05.05.2009). Singapore’s first zero-energy building. Civil Engineering Seminar Series, Lausanne, Switzerland.

Wittkopf, Stephen (23.04.2009). Solar Architecture – Teaching and Research. Archizoom, Lausanne, Switzerland.

Wittkopf, Stephen (06.02.2009). Design and performance of a zero-energy building in Singapore. LESO Lunchtime Lecture Series, Lausanne, Switzerland.

Wittkopf, Stephen & Sadasivan, P.K. (04.12.2008). SSLD Web-calculator. Solaris 2008: the 4th International Conference on Solar Radiation and Daylighting, Hong Kong, China.

Wittkopf, Stephen; Pandey, Anupama; Ang, Kian Seng & Poh, P. (22.10.2008). BIPV Design for Singapore Zero-Energy Building. PLEA 2008 – 25th Conference on Passive and Low Energy Architecture, Dublin, Ireland.

Wittkopf, Stephen (20.10.2008). Challenges in Energy Monitoring – Zero Energy Building Singapore. International Built Environment technologies Conference( BETNET), Singapore.

Dee, A.; Grobe, Lars O.; Jacobs, A.; Norford, L.; Wittkopf, Stephen & Yang, X. (10.10.2008). Per-Pixel sky luminance with HDR photography. Ecole d`ingénieurs et d`architectesde Fribourg, Fribourg.

Wittkopf, Stephen (07.10.2008). Solar architectural design achievements and upcoming projects in Singapore. Solar Energy Asia 2008, Singapore.

Wittkopf, Stephen (04.07.2008). BIPV Design for Singapore Zero-Energy Building. Seminar on Zero-Energy Buildings 2008, Singapore.

Wittkopf, Stephen (24.03.2008). Building Integrated Photovoltaic in Singapore. Energy Carta 2008 - Towards Solar Energy in Singapore, Singapore.

Wittkopf, Stephen (03.03.2008). BIPV in Singapore. 10th IEA Task 10 Experts meeting, Langkawi, Malaysia.

Wittkopf, Stephen (22.11.2007). Design and Performance of Zero-Energy Architecture. PLEA 2007, Singapore.

Wittkopf, Stephen; Lau, S.S.Y. & Baharuddin, B. (22.11.2007). The use of anidolic lighting system in improving daylight illuminance of high-rise buildings in Hong Kong. PLEA 2007, Singapore.

Wittkopf, Stephen (04.11.2007). Building Integrated Photovoltaic. Technology Commercialisation Forum, Singapore.

Wittkopf, Stephen (23.10.2007). BIPV in Singapore. Asia-Pacific Regional Seminar on Climate Change and Sustainable Tourism, Singapore.

Wittkopf, Stephen (16.05.2007). Research proposal and paper writing. NParks Seminar Series 2007, Singapore.

Wittkopf, Stephen (27.01.2007). Solar Architecture - Computational Performance Assessment of Facades with Advanced Daylighting and Photovoltaic Devices. ASHRAE, Dallas, U.S..

Wittkopf, Stephen (11.05.2006). Solar Architecture and Interactive Digital Media. Guest lecture, Bosten, U.S..

Wittkopf, Stephen; Zhou, Z. & Teo, Z. (24.04.2006). I3 – EYE CUBE – Interactive intuitive mixed reality interface for Virtual Architecture. 2nd International Conference on Computer Aided Architectural Design, Sharjah, United Arab Emirates.

Wittkopf, Stephen (19.01.2006). Towards Solar Architecture in Singapore. Seminar Energy Conservation in Tropical Climate, Singapore.

Wittkopf, Stephen (13.01.2006). Renewable Energy issues in Singapore. Singapore Futures, Singapore.

Wittkopf, Stephen (30.11.2005). Building Integrated Photovoltaics. Conference Sustainable Energy Asia, Singapore.

Wittkopf, Stephen (30.11.2005). Building Integrated Solar Cells in Singapore. Conference Sustainable energy Asia, Sinagpore.

Wittkopf, Stephen (24.11.2005). Anidolic Integrated Systems: Improvement of Daylight Performance in Buildings. 5th China urban Housing Conference, Hong Kong.

Wittkopf, Stephen (18.11.2005). Solar Architecture: Daylighting for architectural design. Lecture series and events at Department of Architecture, University of Hong Kong, Hong Kong.

Wittkopf, Stephen (17.11.2005). Virtual Sky Domes for Daylight Performance Simulation. Lecture series and events at Department of Architecture, Hong Kong.

Wittkopf, Stephen (24.10.2005). Towards Solar Architecture in Singapore. Symposium Renewable Energies Made in Germany, Singapore.

Wittkopf, Stephen (26.09.2005). Building Integrated Photovoltaics. Conference Designing an Eco-City under the Sun: A Primer on Building integrated PV Architecture, Singapoer.

Wittkopf, Stephen (26.09.2005). Towards Solar Architecture in Singapore. Towards Solar Architecture in Singapore, Singapore.

Wittkopf, Stephen (10.05.2005). PV and daylighting case studies in tropical climates. Conference National Seminar on Energy in Buildings (NSEB), Subang, Malaysia.

Wittkopf, Stephen (07.04.2005). The case for Solar Power. Conference Design and Delivery for Green Building - Stragetic Thinking for Asia, Singapore.

Wittkopf, Stephen (31.01.2005). The Potential of Building Integrated Photovoltaic for Public Housing in Singapore. Energy Seminar Series, Singapore.

Wittkopf, Stephen (14.11.2004). Camera, Light, Action. Graduate Lecture Notes, Shanghai, China.

Wittkopf, Stephen (02.11.2004). Current Research and Application of Solar Cells in Singapore. Symposium on Renewable Energies in Singapore, Singapore.

Wittkopf, Stephen (01.11.2004). Research Project on Building Integrated Solar Cells in Singapore. Conference Renewable Energies Made in Germany, Singapore.

Wittkopf, Stephen (01.11.2003). Computer aided architectural lighting design - Prospects and challenges. ANZAScA 2003, Sydney, Australia.

Wittkopf, Stephen (09.10.2003). Computational Simulation of Play of Brilliance in Architectural Lighting Design. The Expert International Symposium: City Lighting for Tourism, Hangzhou, China.

Wittkopf, Stephen (07.10.2003). Assesment of qualitative lighting design of glass in virtual architecture. Glasstech Asia, Singapore.

Wittkopf, Stephen & Foo, E.-J. (17.09.2003). Discussing image-based modeling technology for 3D digital archival of physical architecture models. The Education an Research in Computer Aided Architectural Design in Europe (eCAADe), Graz, Austria.

Wittkopf, Stephen & Hee, H. (17.09.2003). Design by Grading? Electronic Buildability Design Appraisal Score (eBDAS) as a Major Design Consideration in Architectural Design in Singapore. Education and Research in Computer Aided Architectural Design in Europe (eCAADe), Graz, Austrai.

Wittkopf, Stephen & Foo, E.-J. (03.05.2003). Challenges of using image-based modeling tool within the architectural design process. CAADRIA Conference on Computer-Aided Architectural Design Research in Asia, Rangsit, Thailand.

Wittkopf, Stephen & Huang, Yixiang (03.05.2003). Web-based computational design support tools - Use of lighting and energy Performance Simulation and web-based visualization for energy integrated architectural design. CAADRIA 2003, Rangsit, Thailand.

Wittkopf, Stephen; Hung, T.C. & Boey, M.K. (28.04.2003). Discussing photon-mapping and radiosity-based rendering algorithms to evaluate qualitative lighting design in contemporary architecture. CAAD Futures (International Conference on Computer Aided Architectural Design Futures, Tainan, Taiwan.

Wittkopf, Stephen (21.11.2001). I-Light, A Web-based learning system for Architectural Lighting Design. ANZAScA (5th Annual Conference of the Australian and New Zealand Architectural Science Association, Wellington, New Zealand.

Wittkopf, Stephen (13.06.2001). Digital Laboratories for Architectural Design. The Asia Business Forum 2001, Singapore.

Wittkopf, Stephen; Holler, R. & Huch, B. (20.03.2000). Licht und Raum - Digitale Simulation. Building Performance - Internationaler Kongress für Licht und Elektrotechnik, Klimatechnik und Gebäudeautomation, Frankfurt, Germany.