6,835 research outputs found
Elastic-DF: Scaling Performance of DNN Inference in FPGA Clouds through Automatic Partitioning
No full textCustomized compute acceleration in the datacenter is key to the wider roll-out of applications based on deep neural network (DNN) inference. In this article, we investigate how to maximize the performance and scalability of field-programmable gate array (FPGA)-based pipeline dataflow DNN inference accelerators (DFAs) automatically on computing infrastructures consisting of multi-die, network-connected FPGAs. We present Elastic-DF, a novel resource partitioning tool and associated FPGA runtime infrastructure that integrates with the DNN compiler FINN. Elastic-DF allocates FPGA resources to DNN layers and layers to individual FPGA dies to maximize the total performance of the multi-FPGA system. In the resulting Elastic-DF mapping, the accelerator may be instantiated multiple times, and each instance may be segmented across multiple FPGAs transparently, whereby the segments communicate peer-to-peer through 100 Gbps Ethernet FPGA infrastructure, without host involvement. When applied to ResNet-50, Elastic-DF provides a 44% latency decrease on Alveo U280. For MobileNetV1 on Alveo U200 and U280, Elastic-DF enables a 78% throughput increase, eliminating the performance difference between these cards and the larger Alveo U250. Elastic-DF also increases operating frequency in all our experiments, on average by over 20%. Elastic-DF therefore increases performance portability between different sizes of FPGA and increases the critical throughput per cost metric of datacenter inference. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Computer Engineerin
Reduced Complexity Single-Carrier Maximum-Likelihood Detection for Decision Feedback Assisted Space-Time Equalization
Get PDFA novel Decision-Feedback (DF) aided reduced complexity Maximum Likelihood (ML) Space-Time Equalizer (STE) designed for single-carrier multiple antenna assisted receivers is introduced. The proposed receiver structure is based on a recursive tree search, which is capable of achieving ML performance at a moderate computational cost and substantially outperforms the linear benchmarker based on the Minimum Mean-Squared Error (MMSE) criterion. Additionally a further complexity reduction scheme is proposed, which exploits the specific characteristics of both the wide-band channel and the proposed DF-STE
Successive-relaying-aided decode-and-forward coherent versus noncoherent cooperative multicarrier space–time shift keying
No full textAbstract—Successive-relaying-aided (SR) cooperative multi-carrier (MC) space–time shift keying (STSK) is proposed for frequency-selective channels. We invoke SR to mitigate the typical 50% throughput loss of conventional half-duplex relaying schemes and MC code-division multiple access (MC-CDMA) to circumvent the dispersive effects of wireless channels and to reduce the SR-induced interference. The distributed relay terminals form two virtual antenna arrays (VAAs), and the source node (SN) successively transmits frequency-domain (FD) spread signals to one of the VAAs, in addition to directly transmitting to the destination node (DN). The constituent relay nodes (RNs) of each VAA activate cyclic-redundancy-checking-based (CRC) selective decode-and-forward (DF) relaying. The DN can jointly detect the signals received via the SN-to-DN and VAA-to-DN links using a low-complexity single-stream-based joint maximum-likelihood (ML) detector. We also propose a differentially encoded cooperative MC-CDMA STSK scheme to facilitate communications over hostile dispersive channels without requiring channel estimation (CE). Dispensing with CE is important since the relays cannot be expected to altruistically estimate the SN-to-RN links for simply supporting the source. Furthermore, we propose soft-decision-aided serially concatenated recursive systematic convolutional (RSC) and unity-rate-coded (URC) cooperative MC STSK and investigate its performance in both coherent and noncoherent scenarios
Neriene calozonata Chen & Zhu 1989
No full text<i>Neriene calozonata</i> Chen & Zhu, 1989 <p>Figs 13–14, 69</p> <p> <i>Neriene calozonata</i> Chen & Zhu, 1989: 162, f. 12–18 (Df); Song, Zhu & Chen, 1999: 193, f. 108I–J (f); Yin <i>et al</i>., 2012: 519, f. 243a–c (f).</p> <p> <b>Material examined. Hubei:</b> Shennongjia Forestry District, Yanzidong Cave, 31.72°N, 110.47°E, 2000m, 7.viii.1986, J. Chen leg., 2FF (CBEE).</p> <p> <b>Diagnosis:</b> This species is similar to <i>Neriene compta</i> Zhu & Sha, 1986 and <i>Neriene nitens</i> Chen & Zhu, 1991 in having the large atrium opening, similar copulatory grooves which have about one and a half coils, but can be distinguished from the latter two species by the following characters: both spermatheca and turning-point long, slender, significantly curved in <i>N. compta</i> and <i>N. nitens</i>, but just slightly long and curved in <i>N. calozonata</i> (Figs 13, 14 B–C, 47A–C, 49C–E).</p> <p> <b>Description of female:</b> The measurements see Chen & Zhu, 1989. Epigynum (Figs 13A, 14B): In ventral view, atrium opening large. Parmula arising from dorsal wall, semicircular with rounded tip, and with a small semicovered depression on its ventral surface. Vulva (Figs 13B, 14C): Vulva as long as wide; copulatory grooves started mesally, with about one and a half coils; fertilization grooves enter the spermathecae, with about one and a half coils; turning-points situated laterally, pointing towards mesally; spermathecae slender, pointing towards laterally. Female habitus as in Fig. 14A.</p> <p> <b>Male:</b> Unknown.</p> <p> <b>Distribution:</b> China (Hubei) (Fig. 69).</p>Published as part of <i>Li, Jian Yong, Liu, Jie & Chen, Jian, 2018, A review of some Neriene spiders (Araneae, Linyphiidae) from China, pp. 1-90 in Zootaxa 4513 (1)</i> on page 16, DOI: 10.11646/zootaxa.4513.1.1, <a href="http://zenodo.org/record/2607658">http://zenodo.org/record/2607658</a>
An Economic Approach for Domino Effect Management
No full textIn light of possible severe consequences of unintentional and intentional domino effects, an integrated domino effect management framework was introduced in Chap. 5 to prevent and mitigate domino effect risk. In this chapter, an economic approach based on safety economics is developed to obtain the optimal protection strategy. First, we introduce the concepts and approaches used in safety economics (Chen et al. in Saf Sci 14, 2021). Then, a domino effect management approach is developed based on cost–benefit analysis and game theory (Chen et al. in Process Saf Environ Prot 134:392–405, 2020). In this approach, the disproportion factor (DF) is employed in the cost–benefit analysis to determine whether a protection strategy is recommended. Besides, an optimization algorithm called “PROTOPT” is developed to achieve the optimal protection strategy.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Safety and Security Scienc
Possible REE constraints on the depositional and diagenetic environment of Doushantuo Formation phosphorites containing the earliest metazoan fauna
No full textHydrodynamical turbulence by fractal fourier decimation
No full textWe present a systematic numerical investigation of high-resolution 3D isotropic and homogeneous turbulence resolved on a decimated set of Fourier modes. Fractal decimation acts to decrease the effective dimensionality of the flow by allowing triadic interactions only in a set of Fourier modes N(k) proportional to k^DF for large k. While keeping the symmetries of the original 3D Navier-Stokes equations unchanged, a dramatic change in small-scale statistics is detected at decreasing the fractal dimension DF . Already at fractal dimension DF = 2.8, a global self-similar behaviour is observed in the inertial range of scales, the consequence of such transition are the restoration of the scaling symmetry and vorticity distribution that becomes close to Gaussian. We relate the results to the different roles of local vs non-local interactions in the energy transfer range
Neriene calozonata Chen & Zhu 1989
No full textNeriene calozonata Chen & Zhu, 1989 (丽带⁂蛛) Figs 24, 39A Neriene calozonata Chen & Zhu, 1989: 162, figs 12–18 (Df). Neriene calozonata – Yin et al. 2012: 519, fig. 243a–c (f). — Li et al. 2018: 24, figs 21a–i, 22a–f, 23a–e (mf). Material examined CHINA • 3 ♀♀; Chongqing, Wushan County, Guanyang Town, Pingqian Management Station; 31°22′23.87″ N, 109°55′44.24″ E; elev. 1814 m; 22 Jul. 2021; Z. S. Zhang, L.Y.Wang and T.Y. Ren leg.; SWUC-T-LIN-10-01–03. Distribution China (Chongqing).Published as part of Irfan, Muhammad, Wang, Lu-Yu & Zhang, Zhi-Sheng, 2023, Survey of Linyphiidae spiders (Arachnida: Araneae) from Wulipo National Nature Reserve, Chongqing, China, pp. 1-85 in European Journal of Taxonomy 871 on page 33, DOI: 10.5852/ejt.2023.871.2129, http://zenodo.org/record/800704
'Response by the author, Daniel F. Vukovich.'
No full textResponse by the author (Vukovich) to a review of Illiberal China (my 2019 monograph
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