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With the expanding of large computing platforms and the increasing of on chip transistors, power consumption becomes a significant problem. Many methods are proposed in different design levels to solve the problem. In this paper, we introduce asynchronous technique to an IEEE-754 double-precision floating-point multiplier aiming to reduce its power consumption. The control path of the asynchronous...
Partitioning network, especially some DTN, can use Message Ferry(MF) scheme to restore network connection. Message TTL describes the maximum delay tolerance of transmission and messages with out-of-date TTL should be dropped. In this paper, we will study the problem of how to design the ferry's moving route dynamically to get high message delivery ratio under the constraint of message TTL, which we...
One emerging trend of implementing phase locked loop (PLL) based frequency synthesizers is to leverage digital signal processing in the loop filtering for more flexibility, scalability and smaller silicon area. This paper examines the pros and cons of such digital-intensive PLL architecture, and discusses techniques to minimize its overhead in terms of implementation cost and performance degradation...
Based on IEEE 802.15.4, a contention-free period (CFP) adopts guarantee time slot (GTS) mechanism to ensure each device can access the radio channel. However, it is hard to get the authority to access the radio channel due to more competitors access the radio channel simultaneously. To cope with this issue, we proposed a guarantee time slot mechanism to enhance the performance and utilization of using...
We propose a chip-based optical buffer that is continuously tunable by microelectromechanical actuation. The device consists of two identical semiconductor waveguides with a mechanically variable gap in-between, allowing for a change of group delay of over 100% and for extremely broadband operation.
Triple play convergence is now one of the important national strategies in China. Stimulated by the need of building a network that is capable of both Telecom and broadcasting services, an optical transport network (OTN) testbed is planed and deployed in Eastern China from 2009 to 2011. This testbed demonstrates the state of the art technologies in optical transport network design. It also features...
This paper is concerned with the optimal filter problems for networked systems with random transmission delays, while the delay process is modeled as a multi-state Markov chain which incorporates the data losses naturally. By defining an indicator function of the random delay, the optimal filter problems are transformed into the ones of the standard Markov jumping parameter measurement system. We...
This paper discusses stability of neural networks (NNs) with time-varying delay. Delay-fractioning Lyapunov-Krasovskii functional (LKF) method and convex analysis are applied to establish a new stability condition. Two possible cases for the delay are taken into account when the delay interval is equivalently divided into two subintervals. The maximal allowable delay that ensures global asymptotical...
The problem of global robust periodicity is studied for a class of neural networks with norm-bounded parameter uncertainties and multiple time-varying delays. Some linear matrix inequality (LMI) representations of delay-dependent periodicity criteria are presented to guarantee the existence, uniqueness and global asymptotic stability of periodic solution for all admissible parametric uncertainties...
The asymptotic synchronization problem of a class of uncertain and delayed chaotic systems is addressed with adaptive compensation designs in this paper. General uncertainties on systems and time-delays in the coupling network are eliminated by the adaptive control scheme, as well as its circuit realization are proposed. Then, an approach that is based on application of Lyapunov stability theory for...
Dynamical behavior of neutral neural networks with distributed delays is studied by employing suitable Lyapunov functional, delay-dependent criteria to ensure local and global asymptotic stability of the equilibrium of the neural networks. Our results are applied to classical neutral neural networks with time delay and some novel asymptotic stability criteria are also derived. The obtained conditions...
In this paper, we will consider the problems where observation delay is time-varying and design distributed estimators by combining a consensus strategy. The optimal local estimator for every node with time-varying observation delay is first designed, which plays an important role in the distributed estimator design. Then the optimal distributed estimator for any choice of the consensus gain is proposed...
Urban area traffic signal control is a complicated issue. Based on the characteristics of vehicle delay, this paper proposes a method for signal timing and phase optimization. Particle swarm optimization (PSO) is adopted to optimize the multiphase traffic signal timing and phase sequence at the intersection. The optimization objective is to minimize the average vehicle delay of every cycle at the...
In this paper, the problem of quantized feedback stabilization for a class of networked control systems with time delay and packet dropout is investigated. First, a primitive quantizer is applied to the communication channel and the lower bounds of bit rate is given to guarantee convergence of quantization error. Second, dynamic quantization error is represented by quantization range via coordinate...
Embedded memory access time is an important parameter that determines the performance of the memory. To accurately characterize the embedded memory access time across Process, Voltage and Temperature (PVT) variation is always a challenge. In order to get more accurate memory access time data across PVT, the proper implementation of embedded memory access time measurement circuitry and characterization...
The next-generation two-way satellite time and frequency transfer (TWSTFT) is to compare clock difference at the sub-nanosecond level. However, many uncertainties, including ionospheric effects, still have to be much well studied for farther reduction. Now, there is a next-generation TWSTFT technique using dual pseudo-random noise (DPN) codes; it has high precision for clock comparison and can also...
In this paper, a modified k-nearest neighbor (k-NN) method integrating the cluster analysis and principal component analysis is applied to bus arrival time (BAT) prediction using historical bus GPS data. The methodology of the k-NN method based on processed GPS data is presented. To validate the introduced k-NN approach, empirical analysis based on data collected from the bus No. 16 of Beijing public...
Opportunistic mobile networks consist of personal mobile devices which are intermittently connected with each other. Data access can be provided to these devices via cooperative caching without support from the cellular network infrastructure, but only limited research has been done on maintaining the freshness of cached data which may be refreshed periodically and is subject to expiration. In this...
This paper proposes an improved power control approach to address the load sharing problems in islanded microgrids. The proposed method first estimates distributed generation (DG) unit feeder impedances through measuring low order point of common coupling (PCC) harmonic voltages and DG unit line harmonic currents. With the knowledge of feeder impedances, reactive power sharing performance can be enhanced...
With the media-independent pre-authentication (MPA), a mobile node (MN) performs the pre-authentication and pre-configuration to get the new care-of-address (nCoA) as the layer 3 handover before the layer 2 handover, in order to lessen handover delay. However, in reality, the MN may perform the layer 2 handover due to the link going down before completing the layer 3 handover. It will cause the packet...
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