排序方式: 共有27条查询结果,搜索用时 15 毫秒
1.
Simoens François Meilhan Jérôme Nicolas Jean-Alain 《Journal of Infrared, Millimeter and Terahertz Waves》2015,36(10):961-985
Journal of Infrared, Millimeter, and Terahertz Waves - Sensitive and large-format terahertz focal plane arrays (FPAs) integrated in compact and hand-held cameras that deliver real-time terahertz... 相似文献
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The effect of CdCl2 (44 microM), HgCl2 (3.7 microM), and MeHgCl (2 microM) on the morphology of Aedes albopictus C6/36 cells was studied at the light microscopical level. Treatment times and metal concentrations were in the sublethal range as determined by a fluorometric dye exclusion test. The three metal species had profound effects on the cell morphology. MeHgCl treatment induced the development of a large number of short, actin-supported, tangled filopodia. Both CdCl2 and HgCl2 induced long extensions. Pretreatment with colchicine but not with cytochalasin B prevented formation of these extensions which suggests that they were supported by microtubules. This was confirmed by immunostaining for microtubules. The extensions were relatively stable towards colchicine post-treatment. To authors' knowledge, this effect has not yet been described for heavy metals. The similarity with 20-hydroxyecdysone-treated cells and the occurrence of cytoplasmic feet in insect cells is discussed. 相似文献
3.
Linear Precoders for Bit-Interleaved Coded Modulation on AWGN Channels: Analysis and Design Criteria
Simoens F. Wymeersch H. Moeneclaey M. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2008,54(1):87-99
This paper investigates linear precoding for bit-interleaved coded modulation (BICM) on additive white Gaussian noise (AWGN) channels. Concatenating a linear precoder as an inner encoder with an outer (convolutional) encoder produces a powerful code with a limited decoding complexity. Linear precoders are examined and optimized for two scenarios: using (i) a noniterative decoding strategy and (ii) an iterative decoding strategy under a perfect feedback assumption. The precoder design is based on an information-theoretical approach, on the one hand, and a pair-wise error probability (PEP) analysis, on the other hand. Both approaches render convenient precoder design rules. For a binary phase-shift keying (BPSK) signal set, the optimal precoders that result from these rules are also derived. Numerical results confirm the analytical findings and simulations illustrate the effectiveness of the approach. 相似文献
4.
Bohez Steven Daneels Glenn Van Herzeele Lander Van Kets Niels Decrock Sam Geyter Matthias De Van Wallendael Glenn Lambert Peter Dhoedt Bart Simoens Pieter Latré Steven Famaey Jeroen 《Multimedia Tools and Applications》2018,77(1):597-629
Multimedia Tools and Applications - Recording videos with smartphones at large-scale events such as concerts and festivals is very common nowadays. These videos register the atmosphere of the event... 相似文献
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6.
B. Joveski M. Mitrea P. Simoens I. J. Marshall F. Prêteux B. Dhoedt 《Multimedia Systems》2013,19(5):455-474
Current remote display technologies for mobile thin clients convert practically all types of graphical content into sequences of images rendered by the client. Consequently, important information concerning the content semantics is lost. The present paper goes beyond this bottleneck by developing a semantic multimedia remote display. The principle consists of representing the graphical content as a real-time interactive multimedia scene graph. The underlying architecture features novel components for scene-graph creation and management, as well as for user interactivity handling. The experimental setup considers the Linux X windows system and BiFS/LASeR multimedia scene technologies on the server and client sides, respectively. The implemented solution was benchmarked against currently deployed solutions (VNC and Microsoft-RDP), by considering text editing and WWW browsing applications. The quantitative assessments demonstrate: (1) visual quality expressed by seven objective metrics, e.g., PSNR values between 30 and 42 dB or SSIM values larger than 0.9999; (2) downlink bandwidth gain factors ranging from 2 to 60; (3) real-time user event management expressed by network round-trip time reduction by factors of 4–6 and by uplink bandwidth gain factors from 3 to 10; (4) feasible CPU activity, larger than in the RDP case but reduced by a factor of 1.5 with respect to the VNC-HEXTILE. 相似文献
7.
Stefan Valentin Hermann S. Lichte Holger Karl Guillaume Vivier Sébastien Simoens Josep Vidal Adrian Agustin 《Wireless Personal Communications》2009,48(1):49-68
In future wireless networks devices may cooperate to form logical links. Each of these links may consist of several independent
physical channels which are shared by the cooperating partners. Even without multiple antennas this cooperation provides diversity
in time and space. This so-called cooperation diversity increases the robustness of the link vs. fading and interference. After surveying approaches in cooperation diversity we
focus on optimizing its performance by combining several cooperation schemes and by integrating cooperation into space-time
coding. For multiple scenarios, we further discuss the factors and benefits introduced by user cooperation and how cooperation-aware
resource allocation can be employed to further increase the performance of cooperative networks. When it comes to implementation,
the question arises how cooperation can be integrated efficiently into existing wireless networks. A case study for 802.11-based
WLANs reveals the issues that need to be solved in order to deploy cooperative techniques. We provide an overview of the state
of the art in implementing cooperation approaches, analyze how appropriate these approaches solve the issues, and, where appropriate,
point out their deficiencies. We conclude with a road map for future research necessary to tackle these deficiencies for the
practical implementation of cooperation in next generation mesh, WLAN, WMAN, and cellular standards.
相似文献
Adrian AgustinEmail: |
8.
Steven Latré Pieter Simoens Bart De Vleeschauwer Wim Van de Meerssche Filip De Turck Bart Dhoedt Piet Demeester Steven Van den Berghe Edith Gilon de Lumley 《Computer Networks》2009,53(10):1587-1602
The recent emergence of multimedia services, such as Broadcast TV and Video on Demand over traditional twisted pair access networks, has complicated the network management in order to guarantee a decent Quality of Experience (QoE) for each user. The huge amount of services and the wide variety of service specifics require a QoE management on a per-user and per-service basis. This complexity can be tackled through the design of an autonomic QoE management architecture. In this article, the Knowledge Plane is presented as an autonomic layer that optimizes the QoE in multimedia access networks from the service originator to the user. It autonomously detects network problems, e.g. a congested link, bit errors on a link, etc. and determines an appropriate corrective action, e.g. switching to a lower bit rate video, adding an appropriate number of FEC packets, etc. The generic Knowledge Plane architecture is discussed, incorporating the triple design goal of an autonomic, generic and scalable architecture. The viability of an implementation using neural networks is investigated, by comparing it with a reasoner based on analytical equations. Performance results are presented of both reasoners in terms of both QoS and QoE metrics. 相似文献
9.
Sam Leroux Steven Bohez Elias De Coninck Tim Verbelen Bert Vankeirsbilck Pieter Simoens Bart Dhoedt 《Knowledge and Information Systems》2017,52(3):791-814
Most of the research on deep neural networks so far has been focused on obtaining higher accuracy levels by building increasingly large and deep architectures. Training and evaluating these models is only feasible when large amounts of resources such as processing power and memory are available. Typical applications that could benefit from these models are, however, executed on resource-constrained devices. Mobile devices such as smartphones already use deep learning techniques, but they often have to perform all processing on a remote cloud. We propose a new architecture called a cascading network that is capable of distributing a deep neural network between a local device and the cloud while keeping the required communication network traffic to a minimum. The network begins processing on the constrained device, and only relies on the remote part when the local part does not provide an accurate enough result. The cascading network allows for an early-stopping mechanism during the recall phase of the network. We evaluated our approach in an Internet of Things context where a deep neural network adds intelligence to a large amount of heterogeneous connected devices. This technique enables a whole variety of autonomous systems where sensors, actuators and computing nodes can work together. We show that the cascading architecture allows for a substantial improvement in evaluation speed on constrained devices while the loss in accuracy is kept to a minimum. 相似文献
10.
In recent years, it has been recognized that bit-interleaved coded modulation with iterative decoding (BICM-ID) achieves excellent performance on virtually any channel, provided the signal mapping is carefully designed. In this paper, we introduce multidimensional mapping for BICM-ID, where a group of bits is mapped to a vector of symbols, rather than a single symbol. This allows for more flexibility and potential performance improvements. Our analysis shows that multidimensional mapping leads to an increase in Euclidean distance, thus boosting the performance compared to conventional mapping schemes. We derive a design criterion for optimal mappings and we provide such optimal mappings for BPSK and QPSK constellations. 相似文献