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- Daniel, Ondrej, et al.
(author)
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Blind sub-Nyquist GNSS signal detection
- 2016
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In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. - 1520-6149. ; 2016-May, s. 6575-6579
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Conference paper (peer-reviewed)abstract
- A satellite navigation receiver traditionally searches for positioning signals using an acquisition procedure. In situations, in which the required information is only a binary decision whether at least one positioning signal is present or absent, the procedure represents an unnecessarily complex solution. This paper presents a different approach for the binary detection problem with significantly reduced computational complexity. The approach is based on a novel decision metric which is utilized to design two binary detectors. The first detector operates under the theoretical assumption of additive white Gaussian noise and is evaluated by means of Receiver Operating Characteristics. The second one considers also additional interferences and is suitable to operate in a real environment. Its performance is verified using a signal captured by a receiver front-end.
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| 3. |
- Daniel, Ondrej, et al.
(author)
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Delay-Accuracy Tradeoff in Opportunistic Time-of-Arrival Localization
- 2018
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In: IEEE Signal Processing Letters. - 1070-9908 .- 1558-2361. ; 25:6, s. 763-767
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Journal article (peer-reviewed)abstract
- While designing a positioning network, the localization performance is traditionally the main concern. However, collection of measurements together with channel access methods require a nonzero time, causing a delay experienced by network nodes. This fact is usually neglected in the positioning-related literature. In terms of the delay-accuracy tradeoff, broadcast schemes have an advantage over unicast, provided nodes can be properly synchronized. In this letter, we analyze the delay-accuracy tradeoff for localization schemes in which the position estimates are obtained based on broadcasted ranging signals. We find that for dense networks, the tradeoff is the same for cooperative and noncooperative networks, and cannot exceed a certain threshold value.
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| 4. |
- Daniel, Ondrej, et al.
(author)
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Hybrid Cooperative Positioning in Harsh Environments
- 2015
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In: IEEE Globecom Workshops. - 9781467395267
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Conference paper (peer-reviewed)abstract
- Hybrid cooperative positioning involves the combination of satellite pseudoranges with measurements based on terrestrial radio signals, with the aim to improve both coverage and accuracy. This paper presents a theoretical analysis of hybrid cooperative positioning in low signal-to-noise ratio environments, explicitly accounting for scenarios where receivers can receive signals but cannot decode navigation messages. We propose an extended pseudorange model, suitable for evaluation of measurements made by the receiver in these scenarios, as well as extended cooperation across agents attempting to enable satellite navigation functionality of receivers operating below signal-to-noise ratio threshold required for proper message decoding. The advantages of such extended cooperation are illustrated on a realistic scenario by means of the Cramer-Rao lower bound.
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| 5. |
- Daniel, Philip B, et al.
(author)
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Two conserved regions within the tissue-type plasminogen activator gene promoter mediate regulation by brain-derived neurotrophic factor
- 2007
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In: The FEBS Journal. - : Wiley. - 1742-464X. ; 274:Issue 9, s. 2411-23
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Journal article (peer-reviewed)abstract
- Tissue-type plasminogen activator (t-PA) has recently been identified as a modulator of neuronal plasticity and can initiate conversion of the pro-form of brain-derived neurotrophic factor (BDNF) into its mature form. BDNF also increases t-PA gene expression implicating t-PA as a downstream effector of BDNF function. Here we demonstrate that BDNF-mediated induction of t-PA mRNA requires an increase in t-PA gene transcription. Reporter constructs harboring 9.5 kb of the human t-PA promoter conferred BDNF-responsiveness in transfected mouse primary cortical neurons. This regulation was recapitulated in HEK 293 cells coexpressing the TrkB neurotrophin receptor. t-PA promoter-deletion analysis revealed the presence of two BDNF-responsive domains, one located between −3.07 and −2.5 kb and the other within the proximal promoter. The upstream region was shown to confer BDNF responsiveness in a TrkB-dependent manner when attached to a heterologous promoter. We also identify homologous regions within the murine and bovine t-PA gene promoters and demonstrate that the equivalent upstream murine sequence functions as a BDNF-responsive enhancer when inserted 5' of the human proximal t-PA promoter. Hence, BDNF-mediated induction of t-PA transcription relies on conserved modular promoter elements including a novel upstream BDNF-responsive domain and the proximal t-PA gene promoter.
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| 6. |
- Daniel, Pierre M., et al.
(author)
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An efficient ERR-Cohesive method for the modelling of delamination propagation with large elements
- 2023
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In: Composites Part A: Applied Science and Manufacturing. - : Elsevier BV. - 1359-835X. ; 167
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Journal article (peer-reviewed)abstract
- The accurate modelling of delamination propagation is necessary to numerically assess the behaviour of layered materials during failure. Many available methods present computational limitations for large structures. Conventional cohesive zone modelling implies using a fine mesh, typically smaller than 1.0 mm, since several elements are needed inside the fracture process zone. This article presents an ERR-Cohesive method to model delamination in elements larger than the fracture process zone. The crack propagation is determined with an estimation of the energy release rate by means of the virtual crack closure technique. To progressively open the crack along the element length, a nodal cohesive law is introduced. The novel cohesive formulation allows to smoothly release the interface while dissipating the appropriate amount of energy. Accurate results have been obtained in double cantilever beam, end-notched flexure and mixed-mode bending tests with regular and irregular meshes for element lengths from 2 mm to 8 mm.
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| 7. |
- de Lange, Michiel, et al.
(author)
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Smart Citizens in the Hackable City : On the Datafication, Playfulness, and Making of Urban Public Spaces Through Digital Art
- 2019
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In: CyberParks – The Interface Between People, Places and Technology. - Cham : Springer Nature. - 9783030134174 - 9783030134167 ; , s. 157-166
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Book chapter (peer-reviewed)abstract
- This contribution explores concepts, approaches and technologies used to make urban public spaces more playful and artful. Through a variety of compelling narratives involving play and art it assists in the design of new cyberparks, public spaces where digitally mediated interactions are an inherent part. How can play and interactive art be used to strengthen urban public spaces by fostering citizen engagement and participation? We propose to not only utilise interactive media for designing urban (public) spaces, but also for social innovation for the benefit of citizens. in cyberparks. The contribution connects urbanity, play and games, as well as concepts of active and passive interactive digital art as part of trends towards pervasive urban interaction, gameful design and artification. We position this as an important part of developing human-centred smart cities where social capital is central, and where citizens engaging in play and art are prerequisites for sustainable communities. Using art, play and games to foster citizen engagement and collaboration is a means to develop social technologies and support the development of collective intelligence in cyberparks. This is studied in concrete cases, such as the Ice Castle in Luleå, Sweden and the Ars Electronica in Linz, from a multi-disciplinary stance involving interaction design, digital art, landscape design, architecture, and health proficiencies. We will analyse two cases of gameful design and one case of digital interactive art being used to address urban issues. Rezone the game is an interactive multimedia game developed to tackle vacancy in the city of Den Bosch in the Netherlands. The Neighbourhood is a board game developed to involve various stakeholders in making their neighbourhood using water as a collective resource.
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| 9. |
- Hosseinalipour, Seyed Mostafa, et al.
(author)
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Coriolis and buoyancy effects on heat transfer in viewpoint of field synergy principle and secondary flow intensity for maximization of internal cooling
- 2021
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In: Heat and Mass Transfer/Waerme- und Stoffuebertragung. - : Springer Science and Business Media LLC. - 0947-7411. ; 57:9, s. 1467-1483
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Journal article (peer-reviewed)abstract
- The present investigation emphases on rotation effects on internal cooling of gas turbine blades both numerically and experimentally. The primary motivation behind this work is to investigate the possibility of heat transfer enhancement by dean vortices generated by Coriolis force and U-bend with developing turbulent in the view point of the field synergy principle and secondary flow intensity analysis. A two-passage internal cooling channel model with a 180° U-turn at the hub section is used in the analysis. The flow is radially outward at the first passage of the square channel and then it will be inward at the second passage. The study covers a Reynolds number (Re) of 10,000, Rotation number (Ro) in the range of 0–0.25, and Density Ratios (DR) at the inlet between 0.1–1.5. The numerical results are compared to experimental data from a rotating facility. Results obtained with the basic RANS SST k-ω model are assessed completely as well. A field synergy principle analysis is consistent with the numerical results too. The results state that the secondary flows due to rotation can considerably improve the synergy between the velocity and temperature gradients up to 20%, which is the most fundamental reason why the rotation can enhance the heat transfer. In addition, the Reynolds number and centrifugal buoyancy variations are found to have no remarkable impact on increasing the synergy angle. Moreover, vortices induced by Rotation number and amplified by Reynolds number increase considerable secondary flow intensity which is exactly in compliance with Nusselt number enhancement.
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| 10. |
- Hüllmann, Dino, 1988-, et al.
(author)
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A Realistic Remote Gas Sensor Model for Three-Dimensional Olfaction Simulations
- 2019
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In: ISOCS/IEEE International Symposium on Olfaction and Electronic Nose (ISOEN). - : IEEE. - 9781538683279 - 9781538683286
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Conference paper (peer-reviewed)abstract
- Remote gas sensors like those based on the Tunable Diode Laser Absorption Spectroscopy (TDLAS) enable mobile robots to scan huge areas for gas concentrations in reasonable time and are therefore well suited for tasks such as gas emission surveillance and environmental monitoring. A further advantage of remote sensors is that the gas distribution is not disturbed by the sensing platform itself if the measurements are carried out from a sufficient distance, which is particularly interesting when a rotary-wing platform is used. Since there is no possibility to obtain ground truth measurements of gas distributions, simulations are used to develop and evaluate suitable olfaction algorithms. For this purpose several models of in-situ gas sensors have been developed, but models of remote gas sensors are missing. In this paper we present two novel 3D ray-tracer-based TDLAS sensor models. While the first model simplifies the laser beam as a line, the second model takes the conical shape of the beam into account. Using a simulated gas plume, we compare the line model with the cone model in terms of accuracy and computational cost and show that the results generated by the cone model can differ significantly from those of the line model.
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