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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...
As a promising communication paradigm, Cognitive Radio Networks (CRNs) have paved a road for Secondary Users (SUs) to opportunistically exploit unused licensed spectrum without causing unacceptable interference to Primary Users (PUs). In this paper, we study the distributed data collection problem for asynchronous CRNs, which has not been addressed before. First, we study the Proper Carrier-sensing...
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...
During the recent years, broadcasting services and mobile services have started converging and it is expected that this trend will continue with other services. In order to deploy efficient solutions for the transport of MPEG media in an interoperable fashion, especially given the recent increased demand of multimedia delivery in the heterogeneous network environment, MPEG has launched a new standardization...
The highly increasing penetration of single-phase photovoltaic (PV) systems pushes the grid requirements related to the integration of PV power systems to be updated. These upcoming regulations are expected to direct the grid-connected renewable generators to support the grid operation and stability both under grid faulty conditions and under normal operations. Grid synchronization techniques play...
Audio-Video-Bridging (AVB) is a promising new commercially available Ethernet-based standard providing mechanism for audio and video transmission over Ethernet supporting demanding audio and video transmission delay requirements. This paper addresses the applicability of using AVB in a fully-switched Ethernet network that covers safety-related functions in the aeronautics. Avionic systems leveraging...
An approach for cheap and deterministic control communication using Ethernet real-time control communication is presented. Field-programmable gate array (FPGA) technology, i.e Xilinx XC3S500E from the Spartan-3E family, is used to implement the Ethernet communication strategy. The unit is defined in Verilog using Xilinx ISE 11.1 software tools. Data packages are sent at well defined times to avoid...
We study the effect of TCP synchronization on Optical Burst Switched (OBS) networks and its impact on capacity dimensioning. The synchronization of TCP flows appears when a burst with segments from different TCP flows is discarded, making that all TCP flows reduce their transmission rate at the same time, leading to inefficient bandwidth sharing. This paper analyzes the bandwidth capacity that needs...
Powered by cloud computing, Dropbox not only provides reliable file storage but also enables effective file synchronization and user collaboration. This new generation of service, beyond conventional client/server or peer-to-peer file hosting with storage only, has attracted a vast number of Internet users. It is however known that the synchronization delay of Dropbox-like systems is increasing with...
In this paper, we present an approach to bounded optimal planning and flexible execution for a robot team performing a set of spatially distributed tasks related by temporal ordering constraints such as precedence or synchronization. Furthermore, the manner in which the temporal constraints are satisfied impacts the overall utility of the team, due to the existence of both routing and delay costs...
In Wireless Multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content...
This paper describes the current Smart high voltage substation where Merging Units and other protection devices require high-precision time synchronization, and analyzes the time synchronization significant role in the Smart substation. With the expansion of the IEC 61850 standard in Smart substation automation applying, the IEEE 1588 which can achieve sub-microsecond level of accuracy seems to be...
Current VLSI systems-on-Chips (SoCs) integrate billions of transistors and are clocked with multi-gigahertz clock frequencies. As the geometrical dimensions of both devices and wires in theses systems become smaller, the internal communication performance between the SoC's blocks is heavily affected by the on-chip interconnect wire delays. In this paper, we propose a high efficient mesochronous outfit...
Load or communication imbalance prevents many codes from taking advantage of the parallelism available on modern supercomputers. We present two scalable methods to highlight imbalance in parallel programs: The first method identifies delays that inflict wait states at subsequent synchronization points, and attributes their costs in terms of resource waste to the original cause. The second method combines...
A clock skew-compensation and/or duty-cycle correction circuit (CSADC) is indispensably required to maximize the performance of synchronous double edge triggered systems. Most conventional CSADCs adopted a cascade structure that inherits a lower performance property so as to slower the locking procedure, meanwhile the dual loop design results in more power consumption and design complexity. A compact...
A clock-deskewing circuit (CDC) using a dual delay-locked-loop technique is presented. The CDC can synchronize the clocks for a chip-to-chip system without delay measurements and dummy delay elements. Simulated in a 0.18µm CMOS technology, the maximum operating frequency is 1.5 GHz and the cycle-to-cycle clock jitter is 7.74 ps. Total power dissipation of the CDC is 56mW under a 1.8-V supply.
Nonlinear interdependency (NLI) analysis is an effective method for measurement of synchronization among brain regions, which is an important feature of normal and abnormal brain functions. But its application in practice has long been largely hampered by the ultra-high complexity of the NLI algorithms. We developed a massively parallel approach to address this problem. The approach has dramatically...
This paper is concerned with the method of impulsive controller design for linear systems with multiple-packet transmission. First, the mathematic model of respond closed-loop is built in terms of linear impulsive systems description. Second, on the basis of guaranteeing closed loop systems stability, the design method of the impulsive feedback controller and the design procedure are given. Finally,...
Desynchronizing streams of frames through the means of offsets has today become common practice in automotive CAN networks. This is because this traffic shaping strategy is very beneficial in terms of reducing response times especially at high load levels. However, to the best of our knowledge, there is no result available in the literature that allows the response times of frames with offsets to...
In this work, a novel online learning algorithm is presented for the synchronization of Global Positioning System (GPS) signal parameters at the acquisition, or coarse synchronization, stage. The algorithm is based on a Bayesian approach, which has, to date, not been exploited for the acquisition problem. Simulated results are presented to illustrate the algorithm performance, in terms of accuracy...
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