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We discuss our approach to federating dissimilar discrete event simulations, leveraging the strengths and design goals of both, to produce a packet-level detailed network model federated with a component-level detailed input-queuing router model. All existing network simulation tools that we are aware of incorporate a very simplistic model for the flow of packets through a router. The simplistic model...
Incast applications have grown in popularity with the advancement of data center technology. It is found that the TCP incast may suffer from the throughput collapse problem, as a consequence of TCP retransmission timeouts when the bottleneck buffer is overwhelmed and causes the packet losses. This is critical to the Quality of Service of cloud computing applications. While some previous literature...
Mitigation of radiation effects is one of the major problems for space-borne computing platforms. The presented work proposes an approach for building reliable, hardware fault adaptive stream processing platforms for space applications. The proposed concept is based on architecture-to-fault adaptation by run-time hardware reconfiguration. The concept assumes representation of system components in...
The problem of adaptive almost surely asymptotically synchronization for stochastic time delay neural network with Markovian Switching is considered in this paper. By using M-matrix method, a sufficient condition under which the response system adaptive almost surely asymptotically synchronizes with the drive system is obtained. To illustrate the effectiveness of the result proposed in this paper,...
This paper investigates the problem of exponential H∞ synchronization for a class of master-slave systems with both discrete and distributed time-delays, norm-bounded nonlinear uncertainties and Markovian switching parameters. Using an appropriate Lyapunov-Krasovskii functional, some delay-dependent sufficient conditions and a synchronization law which include the master-slave parameters are established...
In this paper, the exponentially synchronization is investigated for stochastic complex networks with both switching topology and time-varying delays via pinning control. The model of complex network is quite general since many factors such as noise perturbations, switching topology and internal and outer time-varying delays are considered. By employing the Lyapunov-Krasovskii functional, the It¡§o...
This paper presents a novel energy-efficient pulse switching protocol for ultra light-weight wireless network applications. The key idea is to abstract a single pulse, as opposed to multi-bit packets, as the information exchange mechanism. Pulse switching is shown to be sufficient for event sensing applications with binary sensing. Event sensing with conventional packet transport can be prohibitively...
In this paper, a new countermeasure against power and electromagnetic (EM) Side Channel Attacks (SCA) on FPGA implemented cryptographic algorithms is proposed. This structure mainly focuses on a critical vulnerability, Early Evaluation, also known as Early Propagation Effect (EPE), which exists in most conventional SCA-hardened DPL (Dual-rail with Precharge Logic) solutions. The main merit of this...
Optimal design of Medium Access Control (MAC) layer is one of the most important challenges in Wireless Sensor Networks (WSNs). Main problems in MAC layer of WSNs include sleep/wakeup scheduling and its overhead, collision and energy used for retransmission of collided frames. In this paper, an asynchronous and adaptive approach is proposed to design an energy-efficient multi-channel MAC protocol,...
Underwater Plasma Sound Source (UPSS) has many advantages and is applied more and more widely, so how to get a bigger bunching wave peak pressure is the focus of current research. In this paper, the principle of directional bunching and dual superposition of UPSS was analyzed, the corresponding experimental system was established based on the self-designed parabolic spherical reflector; 5 kinds of...
In IPTV networks, channel change latency is a major concern for achieving the desired quality of experience at the subscribers. Since IPTV connections are established over limited capacity links, the number of channels available to each subscriber's use, at any given point in time, is strictly limited. As a direct consequence of this limitation, channel change requests need to go through the IP infrastructure,...
This paper presents a novel energy-efficient pulse switching protocol for ultra light-weight wireless network applications. The key idea is to abstract a single pulse, as opposed to multi-bit packets, as the information exchange mechanism. Pulse switching is shown to be sufficient for event and target tracking applications with binary sensing. Target tracking with conventional packet transport can...
The goal is to distribute UTC(CH) in a remote location via TCP/IP. The MC (Master Clock) is locked to UTC(CH) via a combination of IRIG-B and 1-PPS signals. The SC (Slave Clock) is controlled by a PI control loop that tracks the MC. The SC-MC clock offset and the transmission delay are estimated simultaneously by means of a TW (Two-Way) comparison process similar to NTP but based on TCP/IP.
Recent years have seen an increasing interest in the scheduling of mixed-criticality real-time systems. These systems are composed of groups of tasks with different levels of criticality deployed over the same processor(s). Such systems must be able to accommodate additional execution-time requirements that may occasionally be needed. When overload conditions develop, critical tasks must still meet...
An all-digital de-skew clock generator for arbitrary wide range delay is proposed to minimize the instability of the clock settling while achieving fast locking time. The clock skew problem is detrimental in high-speed applications, especially when the skew is longer than multi-cycles. The proposed clock generator was fabricated in a 0.18-μm CMOS technology. The clock generator achieves a measured...
Cognitive radio technology solves the problem of spectrum underutilization by allowing the unlicensed users to opportunistically access available spectrum without affecting the activity of licensed user. Channel assignment and routing in cognitive radio networks is especially challenging in networks where nodes are equipped with only a single transceiver (as is the case in commodity wireless networks...
This paper describes the experience from the world first installation of Smart High Voltage substation with IEC 61850 Process Bus where IEEE 1588 Time Synchronization and dynamic multicast filtering have been used. IEC 61850 is one the 30 standards identified by NIST as key elements for achieving interoperability in the Smart Grid. This paper describes the experience from a high voltage substation...
Targeting the distribution of accurate frequency and time references across Packet Switched Networks (PSNs), the IEEE Std 1588™-2008 (a.k.a. 1588V2 or PTPV2) standard specifies network infrastructure components intended to reduce the impact of network elements located between the Grandmaster clock and Slave clocks. Also referred to as On-Path Supports (OPS), these PTPV2 build-in network components...
Some of the key infrastructure requirements for Smart Grid are the uninterrupted and reliable distribution of network data, information security and distribution of time information among network elements in order to accurately timestamp and correlate different network events. High Availability Seamless Ring (HSR) enabled networks can provide zero recovery time and PTPv2 enabled network can provide...
This paper describes the experience from the world first installation of High Voltage substation with IEC 61850 Process Bus where IEEE 1588 Time Synchronization and dynamic multicast filtering have been used. The authors provide brief introduction to the concept of digital substation and process bus, then provide overview of IEEE 1588 standard for precise time synchronization and finally describe...
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