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This paper describes common mode voltage (CMV) of popular pulse width modulation (PWM) methods for driving three-phase voltage source inverter (VSI). Among PWM methods tested, Active zero space vector PWM (AZSVPWM) provides the minimum CMV. However, study on a switching loss and RMS of CMV in AZSVPWM has been ignored. In this paper, not only studying CMV of popular PWM methods, but also, we propose...
In order to enhance the ability of harmonic suppression for multi-pulse converters (MPCs). This paper proposes a novel pulse multiplication method at DC side of MPCs. The presented rectifier consists of a three-phase bridge parallel structure 12-pulse rectifier and a novel double winding tapped inter-phase converter (TIPC). The functions and characteristics of delta-connected autotransformer and ZSBT...
Luo Family Converters (LFCs) are a new series of choppers, which converters fixed D.C voltage magnitude into variable D.C voltage magnitude for high voltage applications. The general requirements of any topology of DC-DC choppers are output voltage regulation, ripple voltage, size, efficiency, and cost. This paper presents a review LFCs based on S-T method for various High energy applications. The...
The inverted pendulum on the cart which has one input and two outputs is an unstable object. Unstable object parameters estimation assumes the active method of identification. The initial angular situation of a pendulum is set, in this case 0.7 radian, and the pendulum corner measurement and the cart position definition is performed further. It gives three numbers — three amplitudes values. Thus,...
The separated control and data planes in software-defined networking (SDN) with high programmability introduce a more flexible way to manage and control network traffic. However, SDN will experience long packet delay and high packet loss rate when the communication link between two planes is jammed by SDN-aimed DoS attacks with massive table-miss packets. In this paper, we propose FloodDefender, an...
Datacenter networks are often structured as multi-rooted trees to provide high bisection bandwidth at low cost. To utilize the available bisection bandwidth, an efficient load balancing algorithm is required. Packet Spraying is known to perform well in symmetric topologies as it provides per-packet load balancing over equal cost paths. However, packet spraying performs poorly in asymmetric topologies...
In datacenter networks, flows can have different performance objectives. We use a tenant-objective division to denote all flows of a tenant that share the same objective. Bandwidth allocation in datacenters should support not only performance isolation among divisions but also objective-oriented scheduling among flows within the same division. This paper studies the Multi-Tenant Multi-Objective (MT-MO)...
Ideally, minimizing the flow completion time (FCT) requires millions of priorities supported by the underlying network so that each flow has its unique priority. However, in production datacenters, the available switch priority queues for flow scheduling are very limited (merely 2 or 3). This practical constraint seriously degrades the performance of previous approaches. In this paper, we introduce...
This paper describes topology and control algorithm of a bidirectional isolated converter with controlled semiconductors at the voltage-fed and current-fed parts. A bidirectional switch connected in series with the transformer winding at the current-fed side features zero-current switching and allows achieving zero-voltage-switching of transistors at the voltage-fed side by utilising leakage inductance...
In this paper we present a correctness proof for Infosoft e-Detailing 1.0 presentation software using Isabelle proof assistant. This work illustrates a method of proving correctness of parallel software using proof assistants. Here we concentrate on the state-based approach for proving a safety property. We also give a comparison of this approach with the correctness proof method that was applied...
Two new nonlinear controllers for voltage source AC-DC converter are presented. The first control algorithm is based on control of the system stored energy and guarantees a global exponential stability of the DC voltage regulation together with decoupled stabilization of the input reactive power on zero level. Second result is a simple feedback linearizing controller, which is developed using a two...
Network functions like load balancers and stateful firewalls which traditionally have been packaged in a single proprietary device are now being virtuahzed in software across multiple physical devices networked together to achieve greater flexibility and scale. A virtualization can become very complex. Separating its definition from the software that implements it allows this complexity to be managed...
The analysis of electromagnetic processes in an electric circuit with the semiconductor converter is presented in the paper. The mathematical model for the analysis of electromagnetic processes in the semiconductor converter with power width regulation of the output voltage has been created. The problem of using the method of multiple parameter modulating function has been solved in the research work.
In opportunistic mobile networks (OppNets), nodes should be in listening state to discover the neighbors for opportunistic message forwarding. While in OppNets, contacts between nodes are sparse, most of nodes' energy is consumed in idle listening state, which highlights the need for energy saving in contact probing. Duty cycle operation can be applied to address this problem. However, it may cause...
In Software Defined Networking (SDN), for performance reasons the control plane consists of multiple SDN controllers that provide a logically centralized network control. To react to traffic changes, the control plane may adapt to improve the performance of the whole network. This adaptation includes the migration of controllers, i.e. the change of their placement, as well as the change of switch...
Bluetooth Low Energy (BLE) is a low-energy personal area wireless network technology that is of increasing importance for large-scale Internet of Things (IoT) deployment. By design, BLE is localized to small regions and to simple network topologies. Moreover, it is not designed for dynamic enforcement of policy and access controls. These limitations are impediments to BLE based IoT service deployment,...
Software Defined Networks (SDNs) are a promising network architecture for future computer networks because they enable more dynamic, fine-grained control over network traffic. OpenFlow is an open standard network protocol that provides specifications for managing network traffic. Permissible (and impermissible) network flows are defined by OpenFlow policies that are translated into network switch...
ISPs face difficulties in optimizing interdomain routing due to the single path routing constraint of BGP. A single best path makes it difficult to optimize routing and is unable to satisfy various application requirements of customers. In this paper, we present a new routing architecture for ISP edge network which breaks this constraint and allows the operator to flexibly assign interdomain paths...
This paper presents a hybrid parallel DC/DC converter to have the advantages of wider zero-voltage switching range, less primary circulating current and higher circuit efficiency. The proposed converter incudes two parallel full-bridge circuits shared the same lagging-leg switches to reduce the switch counts and current stresses of passive components on the secondary side. Half-bridge circuit is connected...
A cooperative strategy for a multirobot system designed to seek multiple sources is proposed in this paper. In the strategy, mobile robots are divided into several groups that simultaneously search different regions. During regional exploration, the robots collect environmental information and share it with one another. This cooperative strategy enables multiple signal sources to be detected more...
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