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Rotary impact screw driver is a tool that can be used during screw-fastening process. In applications where loads used are small, the high torque from impact driver may lead to overturn or cause the screw bit to be disengaged from the screw point. Manual screwing using switch trigger often is a challenge to the users. In this paper, the aim is to ease the screwing process and reduce the problem as...
Modular multilevel converter (MMC) is a promising topology of Voltage Source Converter based High voltage Direct Current (VSC-HVDC) system with many outstanding advantages such as low switching frequency, low voltage distortion and harmonics. Pre-charge process is one of the core issues of MMC based system, especially for the MMC with DC fault blocking capability. In this paper, considering a novel...
Distributed controller architectures in software defined networks raise the issue of switch-controller mapping. In a mapping approach where a switch distributes flow setup requests (traffic) to multiple controllers, a solution that finds the optimal switch-controller mapping and traffic distribution among the controllers for long term performance and responds effectively to network events such as...
In the present paper a bank of local linear observers is designed for an alcoholic fermentation process. The design is based on the respective linear approximants of the mathematical description of the nonlinear process at particular operating points. The target and tolerance operating areas of the process are determined. A residual of the performance of the observers is introduced. A switching mechanism...
Software Defined Networking (SDN) is a new network architecture that separates control plane and data plane. SDN switch models in the literature primarily use queueing theory in two distinct categories: (i) single shared buffer for control plane traffic and data plane traffic, and (ii) buffer with two priorities to isolate control plane and data plane traffic. Several research works have independently...
Many real dynamical processes in control engineering practice can be modelled as a first order plant with saturation at its input. This paper proposes a new solution to control such plants, which is a combination of discrete-time first-order sliding mode (SM) control and discrete-time realization of super twisting control algorithm (STA) that is commonly used in second-order SM. A brief mathematical...
The paper considers the events flow generated with the ergodic semi-Markov processes which are rather adequate formalisms to describe informational-measuring systems under the Von Neumann computer control. Pearson's regression and correlation criteria for estimation of the proximity events flow to the Poisson flow are investigated. It is shown that the procedure used for such criteria calculation...
The reactive model of Software Defined Networking (SDN) invokes controller to dynamically determine the behaviors of a new flow without any pre-knowledge in the data plane. However, the reactive events raised by such flexible model meanwhile consume lots of the bottleneck resources of the fast memory in switch and bandwidth between controller and switches. To address this problem, we propose SoftRing...
This paper presents a concise survey on reaching law based sliding mode control. The goal is to highlight the most important developments related to reaching laws for both continuous time systems and discrete time ones. First, origins of reaching law methodology for continuous time systems are brought up and essential properties of these control methods are discussed. Advances in continuous time reaching...
Software Defined Networking (SDN) introduces a new network architecture offering means of programmability through an externalized centralized control plane. As a result most security research addresses attacks against this central entity. Contrary to that, attacks against the data plane in SDN did not perceive a broad attention in the scientific community so far. In this work we discuss Denial of...
Modern Software Defined Networking (SDN) applications rely on sophisticated packet processing. However, there is a mismatch between control plane requirements and data plane capabilities caused by increasing hardware heterogeneity. To overcome this challenge, we propose TableVisor, a proxy-layer for the OpenFlow control channel that enables the flexible and scalable abstraction of multiple physical...
Scheduling and managing queues with bounded buffers are among the most fundamental problems in computer networking. Traditionally, it is often assumed that all the properties of each packet are known immediately upon arrival. However, as traffic becomes increasingly heterogeneous and complex, such assumptions are in many cases invalid. In particular, in various scenarios information about packet characteristics...
IoT (Internet of Things) devices tend to work intermittently, and the leakage power reduction in the sleeping state is essential. Although giving the reverse body bias to the back gate of transistors is an efficient technique to reduce the leakage power, it has not been commonly used dynamically because of the large timing overhead when a common CMOS process is used. However, recent SOI technologies...
The paper deals with theoretical and practical prerequisites for the systems-on-chip design intended for measurement, processing and output of different kinds of heterogeneous signals. Some problems concerning the basic structure and architecture of these heterogeneous SOCs are investigated, as well as their possible application areas, features and preferences of the used heterogeneous components...
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...
This paper proposes a phase correction strategy for the zero sequence back EMF based sensorless drive under current regulation control (viz., I/f control). The straightforward phase correction process based on the nearest principle might lead to false correction under different load conditions. The proposed strategy can achieve robust phase correction by injecting transitory high frequency (HF) signal...
In software-defined networking (SDN), as data plane scale expands, scalability and reliability of the control plane have become major concerns. To mitigate such concerns, two kinds of solutions have been proposed separately. One is multi-controller architecture, i.e., a logically centralized control plane with physically distributed controllers. The other is control devolution, i.e., delegating control...
software-defined networking (SDN) uses a centralized control plane to manage the whole network. If the scale of the network is large, it is necessary to divide it into multiple domains. Since the network scale becomes larger, the probability of failure occurrences is higher. Therefore, it is important to guarantee the control plane resilience in multi-domain SDN. However, the existing approaches cannot...
Problems of controllability of continuous-discrete linear systems with changes in dimensions of phase space and of control vector are considered. Motion of continuous-discrete system is built. A constructive approach of solution to control problems of such systems is proposed. Necessary and sufficient condition for complete controllability of continuous-discrete linear stationary systems with changes...
Sliding mode control is a well-known regulation method that allows to obtain good robustness with respect to disturbances and model uncertainties. The use of a time-varying sliding hyperplane allows to select its starting position to cross the initial conditions of the system, and then move it toward the desired state. In this way, the sliding mode can be enforced for the whole control process. This...
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