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- Franciscangelis, C., et al.
(författare)
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Vibration measurement on composite material with embedded optical fiber based on phase-OTDR
- 2017
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering Volume 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017; 101683Q (2017). - : SPIE. - 9781510608214
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Konferensbidrag (refereegranskat)abstract
- Distributed sensors based on phase-optical time-domain reflectometry (phase-OTDR) are suitable for aircraft health monitoring due to electromagnetic interference immunity, small dimensions, low weight and flexibility. These features allow the fiber embedment into aircraft structures in a nearly non-intrusive way to measure vibrations along its length. The capability of measuring vibrations on avionics structures is of interest for what concerns the study of material fatigue or the occurrence of undesirable phenomena like flutter. In this work, we employed the phase-OTDR technique to measure vibrations ranging from some dozens of Hz to kHz in two layers of composite material board with embedded polyimide coating 0.24 numerical aperture single-mode optical fiber. © 2017 SPIE.
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| 5. |
- Henningsson, Stefan, et al.
(författare)
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Shaping Information Infrastructure Evolution : Governmental Claims of Architectural Control Points
- 2013
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Ingår i: ECEG 2013 : 13th European Conference on eGovernment - 13th European Conference on eGovernment. - : Academic Conferences International Limited. - 9781909507234 ; , s. 240-247, s. 240-247
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Konferensbidrag (refereegranskat)abstract
- Payments are central for society. Historically, it involved two parties exchanging goods and services for money. Today, payments, with increasing frequency, consist of digital representations of money that are transferred through globally intertwined network. Payments involve many parties such as payers, payment services providers, banks, central banks, telecom operators, mobile handset manufactures, and payees. The digitization of payments that occurs around the world, leads to the emergence of Digital Infrastructure (DI) that is characterized by the number and heterogeneity of included socio‐technical components, relations, and their dynamic and unexpected interactions. DIs are IT solutions that frequently are the shared responsibility of an ecosystem, including private and governmental agencies. In consequence, development of DIs requires approaches that are different from the traditional systems development approaches. It is about modifying (changing and extending) a distributed installed base, shaping the evolution of DIs in desired directions. In this paper we inquiry into the possibilities for actors, such as governments, interested in the DI to influence its evolution towards specific ends. Specifically, through a case study of the payment infrastructure we identify and describe the role of legal and technical architectural control points. These control points are parts of an DI that have particular strategic importance, for example a monopolized gateway or a de jure mandatory standard for behavior or data interchange.
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| 6. |
- Jordan, Ralph, et al.
(författare)
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Decoding of woven convolutional codes and simulation results
- 2000
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Ingår i: [Host publication title missing]. - 0780358570 ; , s. 96-96
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Konferensbidrag (refereegranskat)abstract
- An iterative decoding scheme for woven convolutional codes is presented. It is called pipeline decoding and operates in a window sliding over the received sequence. This exploits the nature of convolutional codes as sequences and suits the concept of convolutional encoding and decoding as a continuous process. The pipeline decoder is analyzed in terms of decoding delay and decoding complexity. Additional interleaving for woven convolutional constructions is introduced by employing a convolutional scrambler. It is shown that some types of interleaving preserve the lower bound on the free distance of the original woven construction. Simulation results for woven convolutional codes are presented
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- Rösevall, John D., et al.
(författare)
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A wireless sensor insole for collecting gait data
- 2014
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Ingår i: Studies in Health Technology and Informatics. - 9781614993926 ; , s. 176-178
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Konferensbidrag (refereegranskat)abstract
- This paper presents the status of the EU project WIISEL - Wireless Insole for Independent and Safe Elderly Living, with the focus on sensors and wireless communications. Pressure and inertial sensors are embedded into insoles and a smartphone collects data utilizing Bluetooth Low Energy..
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