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As more and more cores are integrated on a single chip, memory speed has become a major performance bottleneck. The widening latency gap between high speed cores and main memory has led to the evolution of multi-level caches and using DRAM as the Last-Level-Cache (LLC). The main problem of employing DRAM cache is their high tag lookup latency. If DRAM cache misses, the latency of memory access will...
As a classical ARMA modeling strategy, time series analysis is used widely. But when the model order is high, the computational complexity will be very large. Dynamic??data system can decrease the computational complexity by predigesting two-dimension order searching to one-dimension, but there are some problems, such as complexity of parameter estimate and artificial uncertainty. A modeling strategy...
The High Efficiency Video Coding (HEVC) standard was finalized in early 2013. It provides a far better coding efficiency than any preceding standard but it also bears a significantly higher complexity. In order to cope with the high processing demands, the standard includes several parallelization schemes, that make multi-core encoding and decoding possible. However, the effective realization of these...
Recently, the query on uncertain data attracts much attention and it is great significance for probabilistic reverse k neighbor query on uncertain data based on location-based services (LBS). However, the relevant research is less and immature. Probabilistic reverse k nearest neighbor (PRkNN) requests the query point of reverse k neighbor query and the probability is greater than the given threshold...
In this paper, we investigate cooperative tracking problem for Lipschitz nonlinear multi-agent systems under directed topology. When the relative state information is available, adaptive method is used to construct distributed controllers, under which the system considered in this paper can achieve cooperative tracking. The distinguishing characteristic of our study is that the adaptive protocol is...
Many cryptosystems have weak anti-attack performance facing chosen plaintext attack and chosen cipher-text attack, and generally the solution is cipher block chaining (CBC) that makes the serial operation necessary in encryption process. However, the parallel operation is useful to improve operation speed and is valuable to encrypt large data. Therefore, in view of the computer operating system in...
For multiple aircraft in the fire distribution of the cooperative air combat, on the basis of coordinated air combat attack decision-making metrics, build the warring advantage matrix, establishing the overall advantage function. On this basis, considering the optimal fire distribution strategy, introduce the value of the goal coefficient and vulnerability coefficient of two indicators, according...
In this paper, we study the global finite-time consensus tracking problem for uncertain second-order multi-agent systems subject to input saturation. The communication graphs are allowed to be general directed graphs. An observer-based distributed controller is proposed such that global finite-time consensus tracking is achieved with bounded control inputs. A simulation example is given to illustrate...
In neuroimaging research, brain networks derived from different tractography methods may lead to different results and perform differently when used in classification tasks. As there is no ground truth to determine which brain network models are most accurate or most sensitive to group differences, we developed a new sparse learning method that combines information from multiple network models. We...
The deconvolution technique can improve the spatial resolution of Millimeter and Sub-millimeter Sounding/Imager (MMSI) of FY-4 satellite. In this paper, the technique is applied to the simulated brightness temperature image of a typhoon scene of MMSI, which indicates that the deconvolution technique is feasible to enhance the spatial resolution of MWSI. The typhoon's brightness temperature in the...
This paper investigates the containment control problem for multi-agent systems with nonlinear dynamics under directed graph. Leaders' control inputs are unknown to any of the follower. A distributed adaptive protocol with a finite time unknown input observer is proposed to ensure that the states of the followers asymptotically converge to a convex hull spanned by the dynamic leaders. Compared with...
This paper presents algorithm/hardware co-design for real-time unsupervised spike sorting hardware for reducing power and improving sorting accuracy. We devise an algorithm based on Bayesian decision, which enables high accuracy while using noisy and simple time-domain features. Those simple features significantly reduce computation complexity, memory requirement, and thus the required number of cycles...
The channel nonstationarity caused by the train mobility is measured for the composite high-speed railway (HSR) scenario. The time-varying quasi-stationarity region analysis is based on spectral divergence (SD) metric carried on different frequencies. An obvious transition region is found in composite HSR. Moreover, based on the comparison of different frequencies, we found the apparent discrepancy...
As one of the key research topics in Vehicular Ad Hoc Networks (VANETs), analysis of Signal-to-Interference Ratio (SIR) is always difficult to handle properly. To fully understand the interference characteristics in the dynamic scenario, a performance analysis for the SIR under Rayleigh fading channel is conducted in this paper. To more generally model the dynamic features, the Poisson process and...
The railway fading channel has a significant impact on the design of wireless communication systems for railways. In this paper we present a general stochastic fading channel model based on a large body of measurements performed in railways at 930 MHz. Measurements allow a characterization of the variations of the channel fading behaviors, and the developed empirical model ensures a straightforward...
This paper presents the channel measurements for Massive MIMO communications in indoor scenario at 6 GHz. The channel parameters are jointly estimated using sliding-window SAGE algorithm over the antenna array. The estimated results in delay and angular domains are presented. Considering the large size of antenna array at the transmitter side, the non-stationary phenomenon in the space domain is observed.
With the development of smart grid, power system communication network and intelligent electrical appliance, grid cyber physical system (GCPS) has come to existence. GCPS is a space-time multidimensional heterogeneous system integrated with cyber system and power system. Construction of GCPS greatly improves the sensibility and controllability of system and devices in power systems, providing not...
An important application of air-sea interaction research is in characterizing marine atmospheric boundary layer (MABL) properties, ducting in particular, in order to predict radar and radio communication conditions in the marine environment. This ongoing research project, conducted off the coast of Duck, NC, during October-November of 2015, provided an opportunity to measure EM propagation during...
We consider a three parallel machines scheduling problem with machine-dependent unavailable constraints where the machines are subject to periodic unavailable constraint, tool change constraint, and flexible periodic unavailable constraint, respectively. The objective is to minimize makespan, i.e., the completion time of the last finished job. We present a mixed 0–1 programming model with computational...
In this paper, a text similarity computation method named VSM-Cilin which is based on semantic vector space model is proposed in the background of radio station. VSM-Cilin improved the traditional VSM in the following areas. First, consider the semantic relations between words. Second, use semantic resources to reduce dimension. Third, use inverted index to filter out candidate document set. Forth,...
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