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In a previous paper [1] we introduced an optimized version of the K-Means Algorithm. Unlike the standard version of the K-Means algorithm that iteratively traverses the entire data set in order to decide to which cluster the data items belong, the proposed optimization relies on the observation that after performing only a few iterations the centroids get very close to their final position causing...
The U.S. Department of Defense with the Joint Aerial Layer Network (JALN) concept as well as public companies like Google with their Loon project and Facebook with their solar-powered UAV concept have all invested significant funds to develop and deploy airborne high capacity backbone systems. These systems are intended to augment ground networks in support of disaster relief, to extend Internet access...
This paper proposes an improved proportionate normalized least mean square (i-PNLMS) control algorithm for a DSTATCOM (Distribution Static Compensator) in a system constituted by a nonlinear load fed from a distorted grid. This algorithm helps in achieving the desired grid currents easily and efficiently, and it shows an inherent tendency to adapt to the system's requirements. The obtained THD (Total...
This paper deals with a solar energy conversion system (SECS) interfaced with three phase grid using a fourth order generalized integrator quadrature signal generator (FOGI-QSG)based control algorithm, which helps to mitigate the power quality problems like power factor correction, load balancing, harmonics elimination and noise cancellation. The perturb and observe (P&O) based maximum power tracking...
This paper utilizes concepts and tools of switching algebra to describe an algorithm for computing all candidate keys of a relational database. Our algorithm starts with a superkey comprising all attributes, and then uses logical inference to reduce it to the set of candidate keys. The essential step in this inference is the construction of the complete sum of a pertinent switching function. Some...
In the past few years, Network on chip (NoC) is presented as the best communication architecture for complex chip. Unlike conventional bus, NoC allows many cores to communicate concurrently, provides more scalability and enhance the system performances. For this reason, we propose a flexible router for NoC architecture. The proposed router implements a minimal routing algorithm to avoid deadlocks...
Formation control problems for linear multi-agent systems with switching and directed topologies are investigated. A consensus based protocol is constructed using local neighboring information. An algorithm consisting of three steps is presented to design the formation control protocol. The stability of the proposed algorithm is proven using the piecewise Lyapunov function theory. It is obtained that...
Some applications of the interconnected embedded systems such as sensor networks rely on all nodes in the network to execute certain tasks simultaneously. To meet this demand for simultaneity, a multi-timer model based fully distributed task synchronization algorithm is proposed in this paper. In this multi-timer model, each node containing an embedded system is characterized by a timer. The microcontrollers...
Various parallel applications require a low-latency interconnection network to achieve high performance and high scalability. Recently proposed random network topologies achieve low latency, but they require each switch to have a large number of routing table entries, e.g., larger than N for an N-node network, for implementing a minimal routing. In this study, we propose the use of a random network...
The most efficient way to save energy in cellular networks is to switch ON/OFF base stations (BSs) dynamically according to the distribution of user equipment (UE) at real time. When a BS is switched ON/OFF, there is a switching energy cost incurred, which is a significant amount and cannot be ignored. By considering this switching cost, we formulate the energy saving problem of BSs in cellular networks...
From the viewpoint of the emerging concept of smart grid, distribution network will require fast power flow solution that must be resolved as efficiently as possible. Presence of distributed generators and power electronic based compensating devices, in modern medium and low voltage distribution networks, additionaly expands requirements for performances of algorithms for power flow calculations which...
Partial update (PU) methods play a critical part in least-mean square (LMS) algorithms with an aim to reducing computational complexity. This paper presented a novel variable step-size PU procedure for LMS algorithms via the performance metric, called error difference indicator. With the aid of such an indicator, the PU procedure can determine the proper step size and works efficiently with a low-cost...
This paper presents a novel Kriging surrogate model based optimization algorithm to solve the constrained optimal operation problem in unbalanced three-phase distribution system, which is a mixed-integer, no-convex and nonlinear programming problem. The objective function is to reduce the power loss and to lower the voltage deviation. Considering that the traditional solving methods, such as GA and...
Data-flow analyses are used as part of many software engineering tasks: they are the foundations of program understanding, refactorings and optimized code generation. Similar to general-purpose languages (GPLs), state-of-the-art domain-specific languages (DSLs) also require sophisticated data-flow analyses. However, as a consequence of the different economies of DSL development and their typically...
The development of network services makes their requirements for bandwidth become higher and more various, which leads to difficulty in Quality of Service (QoS) guarantee. In this paper, an OpenFlow switch featuring Weighted Fair Queuing (WFQ) algorithm is proposed. The system is implemented into NetFPGA 1G board which utilizes Xilinx Virtex II Pro 50 technology. The results have shown that our circuit...
A network topology algorithm based on SNMP was put forward and implemented. This algorithm could confirm the connection between ports and improve the efficiency of discovery through combining the topology discovery of the network layer and the link layer. It could solve the problem of subnet information redundancy and incomplete information of address forwarding table during the discovery. The experimental...
Interference is known to cause the performance degradation of the wireless network. To solve the interference problem, cooperative transmission scheme such as interference alignment (IA) is required. Channel state information (CSI) among IA participation nodes should be essentially obtained to implement IA. By implementing the IA prototype with obtaining the real environment CSI, we can check the...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
Soft sliding mode control (SSMC) strategy is given for discrete-time systems with uncertainties by the reaching law with active disturbance rejection function in this paper. The reason of causing chattering is analyzed and a discrete reaching law with boundary layer is developed. A grayscale algorithm is presented for uncertainties and the estimates of parameters are obtained appropriately. Soft sliding...
This work presents mathematical modeling for the Buck d.c.-to-d.c. converter in continuous conduction mode using analytical solving of its functioning equations. Obtained solutions are validated by numerical simulation in MULTISIM. Upon the obtained equations is derived a design algorithm for the Buck converter, which is validated for an input values set, by numerical simulation, both in MULTISIM...
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