[{"article_number":"126","license":"https://creativecommons.org/licenses/by/4.0/","ec_funded":1,"file_date_updated":"2021-10-18T10:42:22Z","publisher":"Association for Computing Machinery","department":[{"_id":"BeBi"}],"publication_status":"published","acknowledgement":"We thank the anonymous reviewers for their generous feedback, and Michal Piovarči for his help in producing the supplemental video. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 715767).\r\n","year":"2021","volume":40,"date_updated":"2024-03-28T23:30:47Z","date_created":"2021-08-08T22:01:26Z","related_material":{"link":[{"description":"News on IST Website","relation":"press_release","url":"https://ist.ac.at/en/news/designing-with-elastic-structures/"}],"record":[{"status":"public","relation":"dissertation_contains","id":"12897"}]},"author":[{"first_name":"Christian","last_name":"Hafner","id":"400429CC-F248-11E8-B48F-1D18A9856A87","full_name":"Hafner, Christian"},{"full_name":"Bickel, Bernd","last_name":"Bickel","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87"}],"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"month":"07","project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"quality_controlled":"1","isi":1,"external_id":{"isi":["000674930900091"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"oa":1,"language":[{"iso":"eng"}],"doi":"10.1145/3450626.3459800","conference":{"name":"SIGGRAF: Special Interest Group on Computer Graphics and Interactive Techniques","start_date":"2021-08-09","location":"Virtual","end_date":"2021-08-13"},"type":"journal_article","issue":"4","abstract":[{"text":"Elastic bending of initially flat slender elements allows the realization and economic fabrication of intriguing curved shapes. In this work, we derive an intuitive but rigorous geometric characterization of the design space of plane elastic rods with variable stiffness. It enables designers to determine which shapes are physically viable with active bending by visual inspection alone. Building on these insights, we propose a method for efficiently designing the geometry of a flat elastic rod that realizes a target equilibrium curve, which only requires solving a linear program. We implement this method in an interactive computational design tool that gives feedback about the feasibility of a design, and computes the geometry of the structural elements necessary to realize it within an instant. The tool also offers an iterative optimization routine that improves the fabricability of a model while modifying it as little as possible. In addition, we use our geometric characterization to derive an algorithm for analyzing and recovering the stability of elastic curves that would otherwise snap out of their unstable equilibrium shapes by buckling. We show the efficacy of our approach by designing and manufacturing several physical models that are assembled from flat elements.","lang":"eng"}],"intvolume":" 40","ddc":["516"],"title":"The design space of plane elastic curves","status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9817","oa_version":"Published Version","file":[{"file_name":"elastic-curves-paper.pdf","access_level":"open_access","creator":"chafner","file_size":17064290,"content_type":"application/pdf","file_id":"10150","relation":"main_file","date_created":"2021-10-18T10:42:15Z","date_updated":"2021-10-18T10:42:15Z","success":1,"checksum":"7e5d08ce46b0451b3102eacd3d00f85f"},{"file_size":547156,"content_type":"application/pdf","creator":"chafner","access_level":"open_access","file_name":"elastic-curves-supp.pdf","checksum":"0088643478be7c01a703b5b10767348f","date_updated":"2021-10-18T10:42:22Z","date_created":"2021-10-18T10:42:22Z","relation":"supplementary_material","file_id":"10151"}],"keyword":["Computing methodologies","shape modeling","modeling and simulation","theory of computation","computational geometry","mathematics of computing","mathematical optimization"],"scopus_import":"1","article_processing_charge":"No","has_accepted_license":"1","day":"19","article_type":"original","citation":{"short":"C. Hafner, B. Bickel, ACM Transactions on Graphics 40 (2021).","mla":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” ACM Transactions on Graphics, vol. 40, no. 4, 126, Association for Computing Machinery, 2021, doi:10.1145/3450626.3459800.","chicago":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” ACM Transactions on Graphics. Association for Computing Machinery, 2021. https://doi.org/10.1145/3450626.3459800.","ama":"Hafner C, Bickel B. The design space of plane elastic curves. ACM Transactions on Graphics. 2021;40(4). doi:10.1145/3450626.3459800","ieee":"C. Hafner and B. Bickel, “The design space of plane elastic curves,” ACM Transactions on Graphics, vol. 40, no. 4. Association for Computing Machinery, 2021.","apa":"Hafner, C., & Bickel, B. (2021). The design space of plane elastic curves. ACM Transactions on Graphics. Virtual: Association for Computing Machinery. https://doi.org/10.1145/3450626.3459800","ista":"Hafner C, Bickel B. 2021. The design space of plane elastic curves. ACM Transactions on Graphics. 40(4), 126."},"publication":"ACM Transactions on Graphics","date_published":"2021-07-19T00:00:00Z"},{"year":"2020","acknowledgement":"The FlexMaps Pavilion has been awarded First Prize at the “Competition and Exhibition of innovative lightweight structures” organized by the IASS Working Group 21 within the FORM and FORCE, joint international conference of IASS Symposium 2019 and Structural Membranes 2019 (Barcelona, 7-11 October 2019) with the following motivation: “for its structural innovation of bending-twisting system, connection constructability and exquisite craftmanship”[20]. The authors would like to acknowledge the Visual Computing Lab Staff of ISTI - CNR, in particular Thomas Alderighi, Marco Callieri, Paolo Pingi; Antonio Rizzo of IPCF - CNR; and the Administrative Staff of ISTI - CNR. This research was partially funded by the EU H2020 Programme EVOCATION: Advanced Visual and Geometric Computing for 3D Capture, Display, and Fabrication (grant no. 813170).","publication_status":"published","department":[{"_id":"BeBi"}],"publisher":"Springer Nature","author":[{"full_name":"Laccone, Francesco","first_name":"Francesco","last_name":"Laccone"},{"full_name":"Malomo, Luigi","first_name":"Luigi","last_name":"Malomo"},{"last_name":"Perez Rodriguez","first_name":"Jesus","id":"2DC83906-F248-11E8-B48F-1D18A9856A87","full_name":"Perez Rodriguez, Jesus"},{"first_name":"Nico","last_name":"Pietroni","full_name":"Pietroni, Nico"},{"first_name":"Federico","last_name":"Ponchio","full_name":"Ponchio, Federico"},{"full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd"},{"full_name":"Cignoni, Paolo","last_name":"Cignoni","first_name":"Paolo"}],"date_updated":"2021-03-03T09:43:14Z","date_created":"2021-02-28T23:01:25Z","volume":2,"article_number":"1505","quality_controlled":"1","doi":"10.1007/s42452-020-03305-w","language":[{"iso":"eng"}],"month":"09","publication_identifier":{"eissn":["25233971"]},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"9208","title":"A bending-active twisted-arch plywood structure: Computational design and fabrication of the FlexMaps Pavilion","status":"public","intvolume":" 2","oa_version":"None","type":"journal_article","abstract":[{"text":"Bending-active structures are able to efficiently produce complex curved shapes from flat panels. The desired deformation of the panels derives from the proper selection of their elastic properties. Optimized panels, called FlexMaps, are designed such that, once they are bent and assembled, the resulting static equilibrium configuration matches a desired input 3D shape. The FlexMaps elastic properties are controlled by locally varying spiraling geometric mesostructures, which are optimized in size and shape to match specific bending requests, namely the global curvature of the target shape. The design pipeline starts from a quad mesh representing the input 3D shape, which defines the edge size and the total amount of spirals: every quad will embed one spiral. Then, an optimization algorithm tunes the geometry of the spirals by using a simplified pre-computed rod model. This rod model is derived from a non-linear regression algorithm which approximates the non-linear behavior of solid FEM spiral models subject to hundreds of load combinations. This innovative pipeline has been applied to the project of a lightweight plywood pavilion named FlexMaps Pavilion, which is a single-layer piecewise twisted arch that fits a bounding box of 3.90x3.96x3.25 meters. This case study serves to test the applicability of this methodology at the architectural scale. The structure is validated via FE analyses and the fabrication of the full scale prototype.","lang":"eng"}],"issue":"9","publication":"SN Applied Sciences","citation":{"mla":"Laccone, Francesco, et al. “A Bending-Active Twisted-Arch Plywood Structure: Computational Design and Fabrication of the FlexMaps Pavilion.” SN Applied Sciences, vol. 2, no. 9, 1505, Springer Nature, 2020, doi:10.1007/s42452-020-03305-w.","short":"F. Laccone, L. Malomo, J. Perez Rodriguez, N. Pietroni, F. Ponchio, B. Bickel, P. Cignoni, SN Applied Sciences 2 (2020).","chicago":"Laccone, Francesco, Luigi Malomo, Jesus Perez Rodriguez, Nico Pietroni, Federico Ponchio, Bernd Bickel, and Paolo Cignoni. “A Bending-Active Twisted-Arch Plywood Structure: Computational Design and Fabrication of the FlexMaps Pavilion.” SN Applied Sciences. Springer Nature, 2020. https://doi.org/10.1007/s42452-020-03305-w.","ama":"Laccone F, Malomo L, Perez Rodriguez J, et al. A bending-active twisted-arch plywood structure: Computational design and fabrication of the FlexMaps Pavilion. SN Applied Sciences. 2020;2(9). doi:10.1007/s42452-020-03305-w","ista":"Laccone F, Malomo L, Perez Rodriguez J, Pietroni N, Ponchio F, Bickel B, Cignoni P. 2020. A bending-active twisted-arch plywood structure: Computational design and fabrication of the FlexMaps Pavilion. SN Applied Sciences. 2(9), 1505.","ieee":"F. Laccone et al., “A bending-active twisted-arch plywood structure: Computational design and fabrication of the FlexMaps Pavilion,” SN Applied Sciences, vol. 2, no. 9. Springer Nature, 2020.","apa":"Laccone, F., Malomo, L., Perez Rodriguez, J., Pietroni, N., Ponchio, F., Bickel, B., & Cignoni, P. (2020). A bending-active twisted-arch plywood structure: Computational design and fabrication of the FlexMaps Pavilion. SN Applied Sciences. Springer Nature. https://doi.org/10.1007/s42452-020-03305-w"},"article_type":"original","date_published":"2020-09-01T00:00:00Z","scopus_import":"1","day":"01","article_processing_charge":"No"},{"oa_version":"None","intvolume":" 134","title":"Novel software-derived workflow in extracranial–intracranial bypass surgery validated by transdural indocyanine green videoangiography","status":"public","_id":"7220","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"2","abstract":[{"text":"BACKGROUND:The introduction of image-guided methods to bypass surgery has resulted in optimized preoperative identification of the recipients and excellent patency rates. However, the recently presented methods have also been resource-consuming. In the present study, we have reported a cost-efficient planning workflow for extracranial-intracranial (EC-IC) revascularization combined with transdural indocyanine green videoangiography (tICG-VA). METHODS:We performed a retrospective review at a single tertiary referral center from 2011 to 2018. A novel software-derived workflow was applied for 25 of 92 bypass procedures during the study period. The precision and accuracy were assessed using tICG-VA identification of the cortical recipients and a comparison of the virtual and actual data. The data from a control group of 25 traditionally planned procedures were also matched. RESULTS:The intraoperative transfer time of the calculated coordinates averaged 0.8 minute (range, 0.4-1.9 minutes). The definitive recipients matched the targeted branches in 80%, and a neighboring branch was used in 16%. Our workflow led to a significant craniotomy size reduction in the study group compared with that in the control group (P = 0.005). tICG-VA was successfully applied in 19 cases. An average of 2 potential recipient arteries were identified transdurally, resulting in tailored durotomy and 3 craniotomy adjustments. Follow-up patency results were available for 49 bypass surgeries, comprising 54 grafts. The overall patency rate was 91% at a median follow-up period of 26 months. No significant difference was found in the patency rate between the study and control groups (P = 0.317). CONCLUSIONS:Our clinical results have validated the presented planning and surgical workflow and support the routine implementation of tICG-VA for recipient identification before durotomy.","lang":"eng"}],"type":"journal_article","date_published":"2020-02-01T00:00:00Z","page":"e892-e902","article_type":"original","citation":{"mla":"Dodier, Philippe, et al. “Novel Software-Derived Workflow in Extracranial–Intracranial Bypass Surgery Validated by Transdural Indocyanine Green Videoangiography.” World Neurosurgery, vol. 134, no. 2, Elsevier, 2020, pp. e892–902, doi:10.1016/j.wneu.2019.11.038.","short":"P. Dodier, T. Auzinger, G. Mistelbauer, W.T. Wang, H. Ferraz-Leite, A. Gruber, W. Marik, F. Winter, G. Fischer, J.M. Frischer, G. Bavinzski, World Neurosurgery 134 (2020) e892–e902.","chicago":"Dodier, Philippe, Thomas Auzinger, Gabriel Mistelbauer, Wei Te Wang, Heber Ferraz-Leite, Andreas Gruber, Wolfgang Marik, et al. “Novel Software-Derived Workflow in Extracranial–Intracranial Bypass Surgery Validated by Transdural Indocyanine Green Videoangiography.” World Neurosurgery. Elsevier, 2020. https://doi.org/10.1016/j.wneu.2019.11.038.","ama":"Dodier P, Auzinger T, Mistelbauer G, et al. Novel software-derived workflow in extracranial–intracranial bypass surgery validated by transdural indocyanine green videoangiography. World Neurosurgery. 2020;134(2):e892-e902. doi:10.1016/j.wneu.2019.11.038","ista":"Dodier P, Auzinger T, Mistelbauer G, Wang WT, Ferraz-Leite H, Gruber A, Marik W, Winter F, Fischer G, Frischer JM, Bavinzski G. 2020. Novel software-derived workflow in extracranial–intracranial bypass surgery validated by transdural indocyanine green videoangiography. World Neurosurgery. 134(2), e892–e902.","ieee":"P. Dodier et al., “Novel software-derived workflow in extracranial–intracranial bypass surgery validated by transdural indocyanine green videoangiography,” World Neurosurgery, vol. 134, no. 2. Elsevier, pp. e892–e902, 2020.","apa":"Dodier, P., Auzinger, T., Mistelbauer, G., Wang, W. T., Ferraz-Leite, H., Gruber, A., … Bavinzski, G. (2020). Novel software-derived workflow in extracranial–intracranial bypass surgery validated by transdural indocyanine green videoangiography. World Neurosurgery. Elsevier. https://doi.org/10.1016/j.wneu.2019.11.038"},"publication":"World Neurosurgery","article_processing_charge":"No","day":"01","scopus_import":"1","volume":134,"date_created":"2019-12-29T23:00:48Z","date_updated":"2023-08-17T14:14:23Z","author":[{"full_name":"Dodier, Philippe","first_name":"Philippe","last_name":"Dodier"},{"id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","first_name":"Thomas","last_name":"Auzinger","full_name":"Auzinger, Thomas"},{"full_name":"Mistelbauer, Gabriel","last_name":"Mistelbauer","first_name":"Gabriel"},{"full_name":"Wang, Wei Te","first_name":"Wei Te","last_name":"Wang"},{"full_name":"Ferraz-Leite, Heber","first_name":"Heber","last_name":"Ferraz-Leite"},{"last_name":"Gruber","first_name":"Andreas","full_name":"Gruber, Andreas"},{"first_name":"Wolfgang","last_name":"Marik","full_name":"Marik, Wolfgang"},{"full_name":"Winter, Fabian","last_name":"Winter","first_name":"Fabian"},{"last_name":"Fischer","first_name":"Gerrit","full_name":"Fischer, Gerrit"},{"last_name":"Frischer","first_name":"Josa M.","full_name":"Frischer, Josa M."},{"full_name":"Bavinzski, Gerhard","last_name":"Bavinzski","first_name":"Gerhard"}],"publisher":"Elsevier","department":[{"_id":"BeBi"}],"publication_status":"published","pmid":1,"year":"2020","language":[{"iso":"eng"}],"doi":"10.1016/j.wneu.2019.11.038","quality_controlled":"1","isi":1,"external_id":{"isi":["000512878200104"],"pmid":["31733380"]},"publication_identifier":{"issn":["1878-8750"],"eissn":["1878-8769"]},"month":"02"},{"article_processing_charge":"No","day":"01","scopus_import":"1","date_published":"2020-08-01T00:00:00Z","page":"P1007-1015","article_type":"original","citation":{"ama":"Dodier P, Winter F, Auzinger T, et al. Single-stage bone resection and cranioplastic reconstruction: Comparison of a novel software-derived PEEK workflow with the standard reconstructive method. International Journal of Oral and Maxillofacial Surgery. 2020;49(8):P1007-1015. doi:10.1016/j.ijom.2019.11.011","ista":"Dodier P, Winter F, Auzinger T, Mistelbauer G, Frischer JM, Wang WT, Mallouhi A, Marik W, Wolfsberger S, Reissig L, Hammadi F, Matula C, Baumann A, Bavinzski G. 2020. Single-stage bone resection and cranioplastic reconstruction: Comparison of a novel software-derived PEEK workflow with the standard reconstructive method. International Journal of Oral and Maxillofacial Surgery. 49(8), P1007-1015.","apa":"Dodier, P., Winter, F., Auzinger, T., Mistelbauer, G., Frischer, J. M., Wang, W. T., … Bavinzski, G. (2020). Single-stage bone resection and cranioplastic reconstruction: Comparison of a novel software-derived PEEK workflow with the standard reconstructive method. International Journal of Oral and Maxillofacial Surgery. Elsevier. https://doi.org/10.1016/j.ijom.2019.11.011","ieee":"P. Dodier et al., “Single-stage bone resection and cranioplastic reconstruction: Comparison of a novel software-derived PEEK workflow with the standard reconstructive method,” International Journal of Oral and Maxillofacial Surgery, vol. 49, no. 8. Elsevier, pp. P1007-1015, 2020.","mla":"Dodier, Philippe, et al. “Single-Stage Bone Resection and Cranioplastic Reconstruction: Comparison of a Novel Software-Derived PEEK Workflow with the Standard Reconstructive Method.” International Journal of Oral and Maxillofacial Surgery, vol. 49, no. 8, Elsevier, 2020, pp. P1007-1015, doi:10.1016/j.ijom.2019.11.011.","short":"P. Dodier, F. Winter, T. Auzinger, G. Mistelbauer, J.M. Frischer, W.T. Wang, A. Mallouhi, W. Marik, S. Wolfsberger, L. Reissig, F. Hammadi, C. Matula, A. Baumann, G. Bavinzski, International Journal of Oral and Maxillofacial Surgery 49 (2020) P1007-1015.","chicago":"Dodier, Philippe, Fabian Winter, Thomas Auzinger, Gabriel Mistelbauer, Josa M. Frischer, Wei Te Wang, Ammar Mallouhi, et al. “Single-Stage Bone Resection and Cranioplastic Reconstruction: Comparison of a Novel Software-Derived PEEK Workflow with the Standard Reconstructive Method.” International Journal of Oral and Maxillofacial Surgery. Elsevier, 2020. https://doi.org/10.1016/j.ijom.2019.11.011."},"publication":"International Journal of Oral and Maxillofacial Surgery","issue":"8","abstract":[{"text":"The combined resection of skull-infiltrating tumours and immediate cranioplastic reconstruction predominantly relies on freehand-moulded solutions. Techniques that enable this procedure to be performed easily in routine clinical practice would be useful. A cadaveric study was developed in which a new software tool was used to perform single-stage reconstructions with prefabricated implants after the resection of skull-infiltrating pathologies. A novel 3D visualization and interaction framework was developed to create 10 virtual craniotomies in five cadaveric specimens. Polyether ether ketone (PEEK) implants were manufactured according to the bone defects. The image-guided craniotomy was reconstructed with PEEK and compared to polymethyl methacrylate (PMMA). Navigational accuracy and surgical precision were assessed. The PEEK workflow resulted in up to 10-fold shorter reconstruction times than the standard technique. Surgical precision was reflected by the mean 1.1 ± 0.29 mm distance between the virtual and real craniotomy, with submillimetre precision in 50%. Assessment of the global offset between virtual and actual craniotomy revealed an average shift of 4.5 ± 3.6 mm. The results validated the ‘elective single-stage cranioplasty’ technique as a state-of-the-art virtual planning method and surgical workflow. This patient-tailored workflow could significantly reduce surgical times compared to the traditional, intraoperative acrylic moulding method and may be an option for the reconstruction of bone defects in the craniofacial region.","lang":"eng"}],"type":"journal_article","oa_version":"None","intvolume":" 49","title":"Single-stage bone resection and cranioplastic reconstruction: Comparison of a novel software-derived PEEK workflow with the standard reconstructive method","status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"7218","publication_identifier":{"eissn":["1399-0020"],"issn":["0901-5027"]},"month":"08","language":[{"iso":"eng"}],"doi":"10.1016/j.ijom.2019.11.011","isi":1,"quality_controlled":"1","external_id":{"pmid":["31866145"],"isi":["000556819800005"]},"volume":49,"date_updated":"2023-08-17T14:15:22Z","date_created":"2019-12-29T23:00:47Z","author":[{"full_name":"Dodier, Philippe","last_name":"Dodier","first_name":"Philippe"},{"full_name":"Winter, Fabian","last_name":"Winter","first_name":"Fabian"},{"full_name":"Auzinger, Thomas","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","first_name":"Thomas","last_name":"Auzinger"},{"full_name":"Mistelbauer, Gabriel","first_name":"Gabriel","last_name":"Mistelbauer"},{"last_name":"Frischer","first_name":"Josa M.","full_name":"Frischer, Josa M."},{"last_name":"Wang","first_name":"Wei Te","full_name":"Wang, Wei Te"},{"first_name":"Ammar","last_name":"Mallouhi","full_name":"Mallouhi, Ammar"},{"full_name":"Marik, Wolfgang","last_name":"Marik","first_name":"Wolfgang"},{"full_name":"Wolfsberger, Stefan","first_name":"Stefan","last_name":"Wolfsberger"},{"full_name":"Reissig, Lukas","first_name":"Lukas","last_name":"Reissig"},{"full_name":"Hammadi, Firas","last_name":"Hammadi","first_name":"Firas"},{"first_name":"Christian","last_name":"Matula","full_name":"Matula, Christian"},{"full_name":"Baumann, Arnulf","last_name":"Baumann","first_name":"Arnulf"},{"last_name":"Bavinzski","first_name":"Gerhard","full_name":"Bavinzski, Gerhard"}],"department":[{"_id":"BeBi"}],"publisher":"Elsevier","publication_status":"published","pmid":1,"year":"2020"},{"file_date_updated":"2020-09-15T12:51:53Z","ec_funded":1,"author":[{"full_name":"Zhang, Ran","orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","last_name":"Zhang","first_name":"Ran"}],"related_material":{"record":[{"id":"486","status":"public","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","status":"public","id":"1002"}]},"date_updated":"2023-09-22T09:49:31Z","date_created":"2020-09-14T01:04:53Z","year":"2020","acknowledgement":"The research in this thesis has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO) and the European Research Council grant agreement No 715767 (MATERIALIZABLE). All the research projects in this thesis were also supported by Scientific Service Units (SSUs) at IST Austria.","publication_status":"published","department":[{"_id":"BeBi"}],"publisher":"Institute of Science and Technology Austria","month":"09","publication_identifier":{"issn":["2663-337X"]},"doi":"10.15479/AT:ISTA:8386","supervisor":[{"full_name":"Bickel, Bernd","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","first_name":"Bernd","last_name":"Bickel"}],"degree_awarded":"PhD","acknowledged_ssus":[{"_id":"SSU"}],"language":[{"iso":"eng"}],"oa":1,"project":[{"grant_number":"642841","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design","call_identifier":"H2020"},{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"abstract":[{"text":"Form versus function is a long-standing debate in various design-related fields, such as architecture as well as graphic and industrial design. A good design that balances form and function often requires considerable human effort and collaboration among experts from different professional fields. Computational design tools provide a new paradigm for designing functional objects. In computational design, form and function are represented as mathematical\r\nquantities, with the help of numerical and combinatorial algorithms, they can assist even novice users in designing versatile models that exhibit their desired functionality. This thesis presents three disparate research studies on the computational design of functional objects: The appearance of 3d print—we optimize the volumetric material distribution for faithfully replicating colored surface texture in 3d printing; the dynamic motion of mechanical structures—\r\nour design system helps the novice user to retarget various mechanical templates with different functionality to complex 3d shapes; and a more abstract functionality, multistability—our algorithm automatically generates models that exhibit multiple stable target poses. For each of these cases, our computational design tools not only ensure the functionality of the results but also permit the user aesthetic freedom over the form. Moreover, fabrication constraints\r\nwere taken into account, which allow for the immediate creation of physical realization via 3D printing or laser cutting.","lang":"eng"}],"type":"dissertation","alternative_title":["ISTA Thesis"],"file":[{"relation":"source_file","file_id":"8388","date_updated":"2020-09-14T12:18:43Z","date_created":"2020-09-14T01:02:59Z","checksum":"edcf578b6e1c9b0dd81ff72d319b66ba","file_name":"Thesis_Ran.zip","access_level":"closed","file_size":1245800191,"content_type":"application/x-zip-compressed","creator":"rzhang"},{"file_name":"PhD_thesis_Ran Zhang_20200915.pdf","access_level":"open_access","creator":"rzhang","content_type":"application/pdf","file_size":161385316,"file_id":"8396","relation":"main_file","date_updated":"2020-09-15T12:51:53Z","date_created":"2020-09-15T12:51:53Z","success":1,"checksum":"817e20c33be9247f906925517c56a40d"}],"oa_version":"Published Version","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","_id":"8386","title":"Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability","ddc":["003"],"status":"public","day":"14","has_accepted_license":"1","article_processing_charge":"No","date_published":"2020-09-14T00:00:00Z","citation":{"ama":"Zhang R. Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability. 2020. doi:10.15479/AT:ISTA:8386","ista":"Zhang R. 2020. Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability. Institute of Science and Technology Austria.","apa":"Zhang, R. (2020). Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:8386","ieee":"R. Zhang, “Structure-aware computational design and its application to 3D printable volume scattering, mechanism, and multistability,” Institute of Science and Technology Austria, 2020.","mla":"Zhang, Ran. Structure-Aware Computational Design and Its Application to 3D Printable Volume Scattering, Mechanism, and Multistability. Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:8386.","short":"R. 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A big thank you to Todor Asenov and other Miba Machine Shop team members for their help with fabrication of experimental prototypes. In addition, I would like to thank Scientific Computing team for the support with high performance computing.\r\nFinancial support was provided by the European Research Council (ERC) under grant agreement No 715767 - MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling, which I gratefully acknowledge.","file_date_updated":"2020-09-16T15:11:01Z","ec_funded":1,"date_published":"2020-09-21T00:00:00Z","page":"118","citation":{"ista":"Guseinov R. 2020. Computational design of curved thin shells: From glass façades to programmable matter. Institute of Science and Technology Austria.","apa":"Guseinov, R. (2020). Computational design of curved thin shells: From glass façades to programmable matter. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:8366","ieee":"R. Guseinov, “Computational design of curved thin shells: From glass façades to programmable matter,” Institute of Science and Technology Austria, 2020.","ama":"Guseinov R. Computational design of curved thin shells: From glass façades to programmable matter. 2020. doi:10.15479/AT:ISTA:8366","chicago":"Guseinov, Ruslan. “Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter.” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:8366.","mla":"Guseinov, Ruslan. Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter. Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:8366.","short":"R. Guseinov, Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter, Institute of Science and Technology Austria, 2020."},"day":"21","has_accepted_license":"1","article_processing_charge":"No","keyword":["computer-aided design","shape modeling","self-morphing","mechanical engineering"],"oa_version":"Published Version","file":[{"file_name":"thesis_rguseinov.pdf","access_level":"open_access","creator":"rguseino","content_type":"application/pdf","file_size":70950442,"file_id":"8367","relation":"main_file","date_created":"2020-09-10T16:11:49Z","date_updated":"2020-09-10T16:11:49Z","success":1,"checksum":"f8da89553da36037296b0a80f14ebf50"},{"date_updated":"2020-09-16T15:11:01Z","date_created":"2020-09-11T09:39:48Z","checksum":"e8fd944c960c20e0e27e6548af69121d","file_id":"8374","relation":"source_file","creator":"rguseino","content_type":"application/x-zip-compressed","file_size":76207597,"file_name":"thesis_source.zip","access_level":"closed"}],"status":"public","title":"Computational design of curved thin shells: From glass façades to programmable matter","ddc":["000"],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","_id":"8366","abstract":[{"text":"Fabrication of curved shells plays an important role in modern design, industry, and science. Among their remarkable properties are, for example, aesthetics of organic shapes, ability to evenly distribute loads, or efficient flow separation. They find applications across vast length scales ranging from sky-scraper architecture to microscopic devices. But, at\r\nthe same time, the design of curved shells and their manufacturing process pose a variety of challenges. In this thesis, they are addressed from several perspectives. In particular, this thesis presents approaches based on the transformation of initially flat sheets into the target curved surfaces. This involves problems of interactive design of shells with nontrivial mechanical constraints, inverse design of complex structural materials, and data-driven modeling of delicate and time-dependent physical properties. At the same time, two newly-developed self-morphing mechanisms targeting flat-to-curved transformation are presented.\r\nIn architecture, doubly curved surfaces can be realized as cold bent glass panelizations. Originally flat glass panels are bent into frames and remain stressed. This is a cost-efficient fabrication approach compared to hot bending, when glass panels are shaped plastically. However such constructions are prone to breaking during bending, and it is highly\r\nnontrivial to navigate the design space, keeping the panels fabricable and aesthetically pleasing at the same time. We introduce an interactive design system for cold bent glass façades, while previously even offline optimization for such scenarios has not been sufficiently developed. Our method is based on a deep learning approach providing quick\r\nand high precision estimation of glass panel shape and stress while handling the shape\r\nmultimodality.\r\nFabrication of smaller objects of scales below 1 m, can also greatly benefit from shaping originally flat sheets. In this respect, we designed new self-morphing shell mechanisms transforming from an initial flat state to a doubly curved state with high precision and detail. Our so-called CurveUps demonstrate the encodement of the geometric information\r\ninto the shell. Furthermore, we explored the frontiers of programmable materials and showed how temporal information can additionally be encoded into a flat shell. This allows prescribing deformation sequences for doubly curved surfaces and, thus, facilitates self-collision avoidance enabling complex shapes and functionalities otherwise impossible.\r\nBoth of these methods include inverse design tools keeping the user in the design loop.","lang":"eng"}],"alternative_title":["ISTA Thesis"],"type":"dissertation"},{"oa_version":"Submitted Version","file":[{"file_name":"coldglass.pdf","access_level":"open_access","creator":"bbickel","file_size":28964641,"content_type":"application/pdf","file_id":"13084","relation":"main_file","date_created":"2023-05-23T20:54:43Z","date_updated":"2023-05-23T20:54:43Z","success":1,"checksum":"c7f67717ad74e670b7daeae732abe151"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"8562","intvolume":" 39","status":"public","ddc":["000"],"title":"Computational design of cold bent glass façades","issue":"6","abstract":[{"lang":"eng","text":"Cold bent glass is a promising and cost-efficient method for realizing doubly curved glass facades. They are produced by attaching planar glass sheets to curved frames and require keeping the occurring stress within safe limits.\r\nHowever, it is very challenging to navigate the design space of cold bent glass panels due to the fragility of the material, which impedes the form-finding for practically feasible and aesthetically pleasing cold bent glass facades. We propose an interactive, data-driven approach for designing cold bent glass facades that can be seamlessly integrated into a typical architectural design pipeline. Our method allows non-expert users to interactively edit a parametric surface while providing real-time feedback on the deformed shape and maximum stress of cold bent glass panels. Designs are automatically refined to minimize several fairness criteria while maximal stresses are kept within glass limits. We achieve interactive frame rates by using a differentiable Mixture Density Network trained from more than a million simulations. Given a curved boundary, our regression model is capable of handling multistable\r\nconfigurations and accurately predicting the equilibrium shape of the panel and its corresponding maximal stress. We show predictions are highly accurate and validate our results with a physical realization of a cold bent glass surface."}],"type":"journal_article","date_published":"2020-11-26T00:00:00Z","citation":{"chicago":"Gavriil, Konstantinos, Ruslan Guseinov, Jesus Perez Rodriguez, Davide Pellis, Paul M Henderson, Florian Rist, Helmut Pottmann, and Bernd Bickel. “Computational Design of Cold Bent Glass Façades.” ACM Transactions on Graphics. Association for Computing Machinery, 2020. https://doi.org/10.1145/3414685.3417843.","short":"K. Gavriil, R. Guseinov, J. Perez Rodriguez, D. Pellis, P.M. Henderson, F. Rist, H. Pottmann, B. Bickel, ACM Transactions on Graphics 39 (2020).","mla":"Gavriil, Konstantinos, et al. “Computational Design of Cold Bent Glass Façades.” ACM Transactions on Graphics, vol. 39, no. 6, 208, Association for Computing Machinery, 2020, doi:10.1145/3414685.3417843.","ieee":"K. Gavriil et al., “Computational design of cold bent glass façades,” ACM Transactions on Graphics, vol. 39, no. 6. Association for Computing Machinery, 2020.","apa":"Gavriil, K., Guseinov, R., Perez Rodriguez, J., Pellis, D., Henderson, P. M., Rist, F., … Bickel, B. (2020). Computational design of cold bent glass façades. ACM Transactions on Graphics. Association for Computing Machinery. https://doi.org/10.1145/3414685.3417843","ista":"Gavriil K, Guseinov R, Perez Rodriguez J, Pellis D, Henderson PM, Rist F, Pottmann H, Bickel B. 2020. Computational design of cold bent glass façades. ACM Transactions on Graphics. 39(6), 208.","ama":"Gavriil K, Guseinov R, Perez Rodriguez J, et al. 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Photo of Fondation Louis Vuitton by Francisco Anzola / CC BY 2.0 / cropped.\r\nPhoto of Opus by Danica O. Kus. This project has received funding from the European Union’s\r\nHorizon 2020 research and innovation program under grant agreement No 675789 - Algebraic Representations in Computer-Aided Design for complEx Shapes (ARCADES), from the European Research Council (ERC) under grant agreement No 715767 - MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling, and SFB-Transregio “Discretization in Geometry and Dynamics” through grant I 2978 of the Austrian Science Fund (FWF). F. Rist and K. Gavriil have been partially supported by KAUST baseline funding.","year":"2020","publisher":"Association for Computing Machinery","department":[{"_id":"BeBi"}],"publication_status":"published","ec_funded":1,"file_date_updated":"2023-05-23T20:54:43Z","article_number":"208","doi":"10.1145/3414685.3417843","language":[{"iso":"eng"}],"acknowledged_ssus":[{"_id":"ScienComp"}],"external_id":{"isi":["000595589100048"],"arxiv":["2009.03667"]},"oa":1,"project":[{"grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020"}],"quality_controlled":"1","isi":1,"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"month":"11"},{"day":"21","month":"09","has_accepted_license":"1","article_processing_charge":"No","date_published":"2020-09-21T00:00:00Z","doi":"10.15479/AT:ISTA:8375","project":[{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020"}],"citation":{"short":"R. 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Guseinov, (2020).","mla":"Guseinov, Ruslan. Supplementary Data for “Computational Design of Cold Bent Glass Façades.” Institute of Science and Technology Austria, 2020, doi:10.15479/AT:ISTA:8761.","chicago":"Guseinov, Ruslan. “Supplementary Data for ‘Computational Design of Cold Bent Glass Façades.’” Institute of Science and Technology Austria, 2020. https://doi.org/10.15479/AT:ISTA:8761.","ama":"Guseinov R. Supplementary data for “Computational design of cold bent glass façades.” 2020. doi:10.15479/AT:ISTA:8761","ieee":"R. Guseinov, “Supplementary data for ‘Computational design of cold bent glass façades.’” Institute of Science and Technology Austria, 2020.","apa":"Guseinov, R. (2020). Supplementary data for “Computational design of cold bent glass façades.” Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:8761","ista":"Guseinov R. 2020. Supplementary data for ‘Computational design of cold bent glass façades’, Institute of Science and Technology Austria, 10.15479/AT:ISTA:8761."}},{"publication_status":"published","publisher":"Springer Nature","department":[{"_id":"BeBi"}],"year":"2020","date_created":"2020-01-13T16:54:26Z","date_updated":"2024-02-21T12:45:02Z","volume":11,"author":[{"first_name":"Ruslan","last_name":"Guseinov","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9819-5077","full_name":"Guseinov, Ruslan"},{"full_name":"McMahan, Connor","last_name":"McMahan","first_name":"Connor"},{"full_name":"Perez Rodriguez, Jesus","first_name":"Jesus","last_name":"Perez Rodriguez","id":"2DC83906-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Daraio","first_name":"Chiara","full_name":"Daraio, Chiara"},{"last_name":"Bickel","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","full_name":"Bickel, Bernd"}],"related_material":{"record":[{"id":"8366","relation":"dissertation_contains","status":"public"},{"relation":"research_data","status":"public","id":"7154"}],"link":[{"url":"https://ist.ac.at/en/news/geometry-meets-time/","relation":"press_release","description":"News on IST Homepage"}]},"article_number":"237","file_date_updated":"2020-07-14T12:47:55Z","ec_funded":1,"isi":1,"quality_controlled":"1","project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"external_id":{"isi":["000511916800015"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"oa":1,"language":[{"iso":"eng"}],"doi":"10.1038/s41467-019-14015-2","month":"01","publication_identifier":{"issn":["2041-1723"]},"title":"Programming temporal morphing of self-actuated shells","status":"public","ddc":["000"],"intvolume":" 11","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"7262","file":[{"file_size":1315270,"content_type":"application/pdf","creator":"rguseino","access_level":"open_access","file_name":"2020_NatureComm_Guseinov.pdf","checksum":"7db23fef2f4cda712f17f1004116ddff","date_updated":"2020-07-14T12:47:55Z","date_created":"2020-01-15T14:35:34Z","relation":"main_file","file_id":"7336"}],"oa_version":"Published Version","type":"journal_article","abstract":[{"lang":"eng","text":"Advances in shape-morphing materials, such as hydrogels, shape-memory polymers and light-responsive polymers have enabled prescribing self-directed deformations of initially flat geometries. However, most proposed solutions evolve towards a target geometry without considering time-dependent actuation paths. To achieve more complex geometries and avoid self-collisions, it is critical to encode a spatial and temporal shape evolution within the initially flat shell. Recent realizations of time-dependent morphing are limited to the actuation of few, discrete hinges and cannot form doubly curved surfaces. Here, we demonstrate a method for encoding temporal shape evolution in architected shells that assume complex shapes and doubly curved geometries. The shells are non-periodic tessellations of pre-stressed contractile unit cells that soften in water at rates prescribed locally by mesostructure geometry. The ensuing midplane contraction is coupled to the formation of encoded curvatures. We propose an inverse design tool based on a data-driven model for unit cells’ temporal responses."}],"article_type":"original","publication":"Nature Communications","citation":{"ama":"Guseinov R, McMahan C, Perez Rodriguez J, Daraio C, Bickel B. Programming temporal morphing of self-actuated shells. Nature Communications. 2020;11. doi:10.1038/s41467-019-14015-2","ieee":"R. Guseinov, C. McMahan, J. Perez Rodriguez, C. Daraio, and B. Bickel, “Programming temporal morphing of self-actuated shells,” Nature Communications, vol. 11. Springer Nature, 2020.","apa":"Guseinov, R., McMahan, C., Perez Rodriguez, J., Daraio, C., & Bickel, B. (2020). Programming temporal morphing of self-actuated shells. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-019-14015-2","ista":"Guseinov R, McMahan C, Perez Rodriguez J, Daraio C, Bickel B. 2020. Programming temporal morphing of self-actuated shells. Nature Communications. 11, 237.","short":"R. Guseinov, C. McMahan, J. Perez Rodriguez, C. Daraio, B. Bickel, Nature Communications 11 (2020).","mla":"Guseinov, Ruslan, et al. “Programming Temporal Morphing of Self-Actuated Shells.” Nature Communications, vol. 11, 237, Springer Nature, 2020, doi:10.1038/s41467-019-14015-2.","chicago":"Guseinov, Ruslan, Connor McMahan, Jesus Perez Rodriguez, Chiara Daraio, and Bernd Bickel. “Programming Temporal Morphing of Self-Actuated Shells.” Nature Communications. Springer Nature, 2020. https://doi.org/10.1038/s41467-019-14015-2."},"date_published":"2020-01-13T00:00:00Z","keyword":["Design","Synthesis and processing","Mechanical engineering","Polymers"],"scopus_import":"1","day":"13","has_accepted_license":"1","article_processing_charge":"No"}]