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In this paper, we implemented OpenFlow scheduled bundle in the Open vSwitch software switch and evaluated its performance in SDN testbed networks under different scenarios. The scheduled bundle is a very new mechanism proposed in the OpenFlow protocol for achieving consistent updates among multiple SDN switches. However, this feature has not been supported in any hardware SDN switches or any software...
In this paper, we designed, implemented, and evaluated the performance of software OpenFlow flow counters in a bare metal commodity switch. Normally, flow counters are implemented in hardware for line-rate operations and their number needs to be very large to support a large flow-based SDN network. Although these hardware counters operate very fast, they greatly increase the cost of an OpenFlow switch...
In this work we consider the input-to-state stability property for a switched system containing both delayed input-to-state stable subsystems and delayed unstable (but forward complete) subsystems. Our main approach is based on the Lyapunov-Razumikhin functions. By using the notion of average dwell time, it is demonstrated that for a system switching among subsystems that admit comparable Lyapunov-Razumikhin...
We propose an energy-efficient diffusion strategy where each node performs the combination step in the diffusion LMS strategy only at every L time slots. This proposed strategy reduces the inter-node communication overhead by L-fold, but yields a steady-state network mean-square deviation (MSD) higher than the traditional diffusion LMS strategy. To improve the steady-state network MSD performance,...
Openvswitch is the most popular software implementation of an OpenFlow switch on the Linux system. Its current implementation includes a kernel module and a user space daemon. To connect with an OpenFlow controller and handle all the command message traffic, Openvswitch needs to transfer control messages between the user space and the kernel space of the Linux system frequently. When the amount of...
Wireless sensor networks (WSNs) which powered by batteries are widely used in military, healthcare, and scientific environments. One important challenge for setting WSN is the energy problem. Power management is one of efficient solutions for such problem and must be taken into account at all levels of the WSN. However, the power management may be out of action when the WSN suffers malicious attacks...
Big-Data applications need to shuffle their data over a network in a very large amount. The ability to efficiently allocate network resources to quickly finish the shuffle greatly affects the overall processing speed of Big-Data applications. The recent emergence of software-defined networking (SDN) technology makes it easier for the network to integrate with a Big-Data application. The network can...
This paper presents the key technology used in smart power community with an introduction into the background, concept and characteristics of smart power community. The modeling and simulation of micro-grid system are conducted to identify the proper control strategy to reach its ideal state. Then the load of smart power community is classified and efficient power utilization strategy is proposed.
The emerging cloud computing is developing into a new enable technology for service integration, making essential conditions for the appearance of public clouds, which integrate external services and provide services to third-party users. In contrary with traditional application integration, the service integrated in public clouds has to deal with a larger scale user accesses and monitor the execution...
In this paper, a new optimal space-vector pulse- width modulation (SVPWM) technique is presented for three-phase voltage source inverters. 6 sectors are redivided into 12 ones based on SVPWM, and combining with local over- modulation method, the discontinuous SVPWM strategies called as DSVPWMx including DSVPWMP, DSVPWMN, DSVPWMPN1 and DSVPWMPN3 are proposed. The principle of the new DSVPWMx is developed,...
Multilevel resistance switching characteristics of the thin FeOx-transition layer were studies by controlling the maximum current compliance during set process. It is obtained that the LRS is mainly influenced by the compliance current value, which is nearly independent to the HRS. Moreover, statistics of set and reset electrical parameters show that the possible switching process is localized, and...
Multilevel resistance switching characteristics of the thin FeOx-transition layer were studies by controlling the maximum stopped voltage during reset process. It is obtained that the HRS is mainly influenced by the stopped voltage value, which is nearly independent to the LRS. Moreover, statistics of set and reset electrical parameters show that the possible switching process is localized, and also,...
In this paper, a novel design method has been proposed to realize feed-forward low-distortion unity STF sigma-delta modulators which are the critical blocks in multi-loop SMASH structure. Using the method, a timing-relaxed stable unity STF 2nd-order modulator has been proposed in detail. After that, an extremely high-resolution SMASH 2(3b)-2(3b)-1(2b) has been suggested using the proposed stages....
The memristor is a fundamental circuit element (along with capacitor, resistor and inductor) whose conductance is dependent on the previous functioning history. The concept was postulated almost four decades ago and was actually fabricated only recently. We report the fabrication of memristive junctions using an insulating film of a monolayer of cadmium stearate deposited using the Langmuir-Blodgett...
This paper presents a practical and effective novel approach to solve the Disaster Prevention and Alert (DPA) management problem. The problem is usually caused by the traditional DAC approach in building's Fire Prevention and Fighting (FPF) system. Web-Enabled Interface/Controller (WEIC), Human-Machine Interface (HMI) display and Data Acquisition and Control (DAC) technologies are applied. Techniques...
The objective of this study is to present a valuation methodology that accounts for the possible real options embedded in a KM project investment in order to help firms' managers adjust the future directions of such projects in response to uncertainty.
In this paper, a high-resolution medium-frequency single-loop fourth-order 1-bit sigma-delta modulator is implemented in 0.18 ??m CMOS technology. The modulator has been presented with an oversampling ratio of 50, clock frequency of 31.25 MHz, 312.5 kHz bandwidth, and achieves a peak SNR of 101.7 dB, which is 16.6-bit resolution, 103 dB dynamic range. The whole circuits consume 58.55-mW from a single...
The IEEE 802.11(p)/1609 standard is an emerging technology for vehicular communication networks. It amends the IEEE 802.11-2007 standard and defines a new WAVE operational mode for vehicular environments. The WAVE mode utilizes a combined FDMA/TDMA scheme to manage network bandwidth. In this mode, a node must periodically switch its frequency channel between two different channels over time. Such...
We report an innovative method of fabricating atomic switching junctions using an LB film of cadmium stearate in the gap between an inert electrode and a chalcogenide solid electrolyte. The thickness of the monolayer is about 2.8 nm and it helps ensure a constant gap size maintaining identical characteristics in a large number of switching junctions. We used a new energetic plasma process to create...
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