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- 实验方案
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Reconfigurable Near-field Enhancement with Hybrid Metal-Dielectric Oligomers
摘要： Tailoring of the near-field properties of the nanostructures is a significant task for the control of radiation of nanoscale light sources as well as for sensing applications. Generally, this task is solved in plasmonic oligomers on the fabrication step by the choice of geometry or by controlling the excitation light during the experiments. Here, the pronounced modification of the near-field pattern in hybrid gold-silicon oligomers by femtosecond laser reshaping by visualizing it with aperture-type near-field optical microscope is demonstrated. This effect correlates with a moderate red-shift of the broadband magnetic dipole resonance of the structure that occurs upon reshaping the gold component of the oligomers. The proposed all-optical near-field reconfiguration approach makes hybrid oligomers a promising platform for on-demand engineering of local field enhancement in metadevices for data recording and sensing.
关键词： near-field tuning,metal-dielectric oligomers,femtosecond laser reconfiguration
更新于2025-09-23 15:23:52
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[IEEE 2018 Conference on Design and Architectures for Signal and Image Processing (DASIP) - Porto, Portugal (2018.10.10-2018.10.12)] 2018 Conference on Design and Architectures for Signal and Image Processing (DASIP) - Low Power Image Processing Applications on FPGAs Using Dynamic Voltage Scaling and Partial Reconfiguration
摘要： The TULIPP project aims to facilitate the development of embedded image processing systems with real-time and low-power constraints. In this paper, several adaptive dynamic runtime techniques for reconfigurable SoCs are described. These methods are used for low power image processing applications on high-performance embedded platforms. Dynamic voltage scaling and dynamic partial reconfiguration target the low-power requirements of the embedded systems while debugging supports the fast development on the hardware side of the system. The proposed techniques were tested and verified using an own developed custom SDSoC image processing library.
关键词： low power,FPGA,image processing,Debugging,Embedded systems,reconfigurable,real-time,Dynamic Voltage Scaling,Dynamic Partial Reconfiguration
更新于2025-09-23 15:22:29
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[IEEE 2018 28th International Conference on Field Programmable Logic and Applications (FPL) - Dublin, Ireland (2018.8.27-2018.8.31)] 2018 28th International Conference on Field Programmable Logic and Applications (FPL) - Time-Shared Execution of Realtime Computer Vision Pipelines by Dynamic Partial Reconfiguration
摘要： This paper presents an FPGA runtime framework that demonstrates the feasibility of using dynamic partial reconfiguration (DPR) for time-sharing an FPGA by multiple realtime computer vision pipelines. The presented time-sharing runtime framework manages an FPGA fabric that can be round-robin time-shared by different pipelines at the time scale of individual frames. In this new use-case, the challenge is to achieve useful performance despite high reconfiguration time. The paper describes the basic runtime support as well as four optimizations necessary to achieve realtime performance given the limitations of DPR on today's FPGAs. The paper provides a characterization of a working runtime framework prototype on a Xilinx ZC706 development board. The paper also reports the performance of streaming vision pipelines when time-shared.
关键词： partial reconfiguration,realtime time-sharing,computer vision
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE Symposium on Computers and Communications (ISCC) - Natal (2018.6.25-2018.6.28)] 2018 IEEE Symposium on Computers and Communications (ISCC) - QoS Guaranteed Batch Scheduling for Optical Switches Based on Unequal Weight Sequence
摘要： Due to the reconfiguration overhead of optical fabrics, batch scheduling method is generally used to schedule an optical packet switch, with a necessary speedup inside the switch to ensure 100% throughput with a bounded packet delay. Existing algorithms take each traffic matrix as a batch, and adopt traffic matrix decomposition techniques to decompose it into the sum of a set of weighted permutation matrices (which are then used as switch configurations). Nevertheless, existing algorithms adopt an equal weight for all switch configurations, meaning that each configuration should be held for the same time duration to transmit packets. We observe that this rigid strategy may limit the flexibility of the scheduling and result in a large speedup requirement due to inefficient time slot utilization. Motivated by this observation, we propose a UWS (Unequal Weight Sequence) algorithm to decompose the traffic matrix. UWS uses a different weight for each switch configuration. It first takes an arithmetic progression as the starting weight sequence, and then adjusts the weights for configurations to ensure 100% throughput with a bounded packet delay (such that QoS can be guaranteed). We theoretically prove that the worst case speedup of UWS will never be larger than that of the best existing ADAPT algorithm. Simulation results indeed demonstrate a speedup improvement of around 15%.
关键词： speedup,Optical switch fabric,scheduling,reconfiguration overhead
更新于2025-09-23 15:22:29
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Advances in Production Research (Proceedings of the 8th Congress of the German Academic Association for Production Technology (WGP), Aachen, November 19-20, 2018) || Concept for Automated Robot Programming Using Image Processing
摘要： The trend towards customized products and the shortening of product lifecycles leads to changing requirements for production systems. Their flexibilization is focus of different approaches, among others regarding possibilities to alter the mechanical configuration. Within, modularization and robotics serve as key enablers, allowing a flexible composition of plant sections as well as a free manipulation of objects. One major challenge is the adaptive robot programming, especially for free positionable plant modules. This paper presents a modular architecture for offline robot programming based on position measurement via image processing, robot path simulation and a novel concept for data management using asset administration shells for standardized data access and exchange. In particular, the concept for localizing objects via two dimensional data codes is described and evaluated.
关键词： Reconfiguration,3D-Image processing,Adaptive control
更新于2025-09-23 15:21:21
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[IEEE 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - Santos, Brazil (2019.12.1-2019.12.4)] 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - Evaluation of Techniques to Reduce the Effects of Partial Shading on Photovoltaic Arrays
摘要： Shading is a harmful effect that decreases the power output of photovoltaic arrays. It can be observed that only a single shaded module is able to drastically reduce the energy production of the photovoltaic array. In addition, when shading reaches a larger number of modules, it becomes even more necessary to use techniques to reduce this effect, because in a series association the less efficient module limits the string current. This paper presents an analysis of six techniques that aim to reduce energy losses in photovoltaic panels operating under partial shading conditions. The techniques are evaluated through computer simulations, with the aid of PSIM? software. Therefore, a comparison is made between these techniques, defining which is the most suitable for each shading profile.
关键词： reconfiguration,photovoltaic modules,partial shading,by-pass diodes
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE Electrical Power and Energy Conference (EPEC) - Montreal, QC, Canada (2019.10.16-2019.10.18)] 2019 IEEE Electrical Power and Energy Conference (EPEC) - Photovoltaic Array Reconfiguration to Reduce Partial Shading Losses using Water Cycle Algorithm
摘要： Partial Shading (PS) increases the power losses in Photovoltaic (PV) arrays significantly. Consequently, PS is considered one of the biggest challenges that face the operation of PV systems. PV arrays dynamic reconfiguration is a promising technique used to reduce PS losses. This paper proposes the Water Cycle Algorithm (WCA) as a new optimization technique for large PV array reconfiguration to reduce PS power losses. The execution time of the proposed algorithm is shorter than the existing algorithms when dealing with large PV arrays under irregular partial shading patterns.
关键词： photovoltaic,partial shading,reconfiguration,water cycle algorithm,optimization
更新于2025-09-23 15:21:01
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Coplanar waveguidea??based ultraa??wide band antenna with switchable filtering of WiMAX 3.5a??GHz and WLAN 5a??GHz signals
摘要： This paper presents a compact single-layer UWB antenna based on a coplanar waveguide structure. The antenna operates within bandwidth from 3 to 10.6 GHz (111.76%). The antenna incorporates two notch-filters, designed to mitigate possible interference with WiMAX and WLAN. This filtering function can be switched on or off, independently for each band, by using pin diodes. This feature allows fast adaptation, supporting spectrum sharing solutions with a compact and planar antenna. The simulated and measured results of the proposed antenna are in good agreement, with the maximum antenna gains dropping after activation of the filtering from 2.5 to ?10 dBi in WiMAX 3.5 GHz band and from 3 to ?8 dBi in WLAN 5 GHz band.
关键词： CPW-feed,notch band,UWB monopole antenna,reconfiguration,PIN diode
更新于2025-09-23 15:19:57
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Novel reconfiguration approach to reduce line losses of the photovoltaic array under various shading conditions
摘要： This paper presents a novel fixed reconfiguration scheme to reduce partial shading conditions in the Photovoltaic (PV) array. The proposed approach is based on Skyscraper (SS) technique, which implies that the physical location of the PV modules in the array is arranged using Skyscraper fashion so that it distributes the shading impacts across the array in order to increase energy yields. Various kinds of partial shading conditions have been taken into account to examine the effects on the proposed approach in 6×6 array. Further, the performance of the proposed arrangement is compared with the other existing array interconnections such as ”series-parallel (SP), total-cross-tied (TCT), bridge-link (BL), honey-comb (HC) and Arrow-SuDoKu (AS)” by obtaining the several parameters like ”global maximum power point (GMPP), the voltage at GMPP, fill-factor, shading losses, efficiency, and possible local peaks (PLP)”. In addition to this, a simple calculation is performed to evaluate the wiring losses for the proposed skyscraper arrangement. Lastly, the outcome of this paper demonstrates that the suggested skyscraper scheme reduces the loss of shading and increases the power production relative to the other array interconnections. Also, in comparison with the Arrow SuDoKu scheme, the proposed scheme is impacted by the minimum wiring loss.
关键词： Photovoltaic Modelling,PV array Interconnections,Static fixed reconfiguration
更新于2025-09-23 15:19:57
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Optical Communications and Networks
摘要： Due to energy and throughput constraints of visual sensing nodes, in-node energy conservation is one of the prime concerns in visual sensor networks (VSNs) with wireless transceiving capability. To cope with these constraints, the energy ef?ciency of a VSN for a given level of reliability can be enhanced by recon?guring its nodes dynamically to achieve optimal con?gurations. In this paper, a uni?ed framework for node classi?cation and dynamic self-recon?guration in VSNs is proposed. The proposed framework incorporates quality-of-information (QoI) awareness using peak signal-to-noise ratio-based representative metric to support a diverse range of applications. First, for a given application, the proposed framework provides a feasible solution for the classi?cation of visual sensing nodes based on their ?eld-of-view by exploiting the heterogeneity of the targeted QoI within the sensing region. Second, with the dynamic realization of QoI, a strategy is devised for selecting suitable con?gurations of visual sensing nodes to reduce redundant visual content prior to transmission without sacri?cing the expected information retrieval reliability. The robustness of the proposed framework is evaluated under various scenarios by considering: 1) target QoI thresholds; 2) degree of heterogeneity; and 3) compression schemes. From the simulation results, it is observed that for the second degree of heterogeneity in targeted QoI, the uni?ed framework outperforms its existing counterparts and results in up to 72% energy savings with as low as 94% reliability.
关键词： visual sensor networks,dynamic reconfiguration,node,3D field-of-view modelling,classification,energy optimization,quality-of-information,reliability analysis
更新于2025-09-23 15:19:57