The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes an approach to model switched Ethernet communication within a model- and component-based software development framework for vehicular distributed embedded systems. The paper also presents a method to extract the network timing model from the systems that use switched Ethernet networks. In order to provide a proof of concept, an existing industrial component model and its tool suite,...
Limited travel constrains the widely application of XYZ parallel micro/nano-positioning stage. In this paper, a novel parallel-kinematics micro/nano-positioning stage is proposed with the goal of enlarging the travel range. In order to obtain a large input displacement for actuating the stage, voice coil motors (VCM) are adopted. For a large-travel parallel stage, the cross-axis motion increases the...
Dead-time effect of dual active bridge (DAB) DC-DC converter is usually out of consideration in traditional optimized strategies, causing the deviation of the theoretical and actual results. In this paper, the current stress model of DAB with dead-time effect is given, and combining the transmission power model, a current-stress-optimized strategy is proposed. Meanwhile, the corresponding control...
Cyber network analysts follow complex processes in their investigations of potential threats to their network. Much research is dedicated to providing automated decision support in the effort to make their tasks more efficient, accurate, and timely. Support tools come in a variety of implementations from machine learning algorithms that monitor streams of data to visual analytic environments for exploring...
The area of visualization in cyber-security is advancing at a fast pace. However, there is a lack of standardized guidelines for designing and evaluating the resulting visualizations. Furthermore, limited end-user involvement in the design process leads to visualizations that are generic and often ineffective for cyber-security analysts. Thus, the adoption of the resultant cyber-security visualizations...
The application of machine learning to software fault injection data has been shown to be an effective approach for the generation of efficient error detection mechanisms (EDMs). However, such approaches to the design of EDMs have invariably adopted a fault model with a single-fault assumption, limiting the practical relevance of the detectors and their evaluation. Software containing more than a...
This paper addresses the generation of stochastic models for dependability and performability analysis of complex systems, through automatic replication of template models. The proposed solution is tailored to systems composed by large populations of similar non-anonymous components, interconnected with each other according to a variety of topologies. A new efficient replication technique is presented...
Although federated cloud computing has emerged as a promising paradigm, autonomous orchestration of resource utilization within the federation is still required to be balanced on the basis of workload assignment at a given time. Such potential imbalance of workload allocation as well as resource utilization may lead to a negative cloudburst within the federation. The analytical models found in the...
In this work, we address the problem of reducing the vibrations in the case of a thin flexible beam, with an Euler-Bernoulli configuration thanks to a new type of feedback controller based on a delayed proportional action. The flexible structure is equipped with two piezoelectric patches: one of them works as a sensor and the other as an actuator. Each one of them is bonded on one side of the beam...
A method for the symbolic calculation of the harmonic distortion components of op-amp based memristive amplifiers is presented. The resulting fully-symbolic expressions are obtained by using an analytical model for the Hewlett-Packard memristor. The symbolic harmonic analysis allows us to provide more insight on the memristive transfer of the amplifiers. In addition, numerical evaluations are achieved...
We present a novel input sensitive analysis of a deterministic online algorithm \cite{r_approx16} for the minimum metric bipartite matching problem. We show that, in the adversarial model, for any metric space \metric and a set of n servers S, the competitive ratio of this algorithm is O(\mu_{\metric}(S)\log^2 n); here \mu_{\metric}(S) is the maximum ratio of the traveling salesman tour and the diameter...
Internet scale continues to expand, the IPv6 protocol standard is implemented in the network gradually, make the behavior characteristic of the network become more changeful and more unstable, so it can be more detailed to carry on network situation perception system according to network data stream to become the next research direction. The support of IPv6 Network Situation Awareness system is realized...
This paper examines the accuracy of the zero-order hold (ZOH) model of the digital pulsewidth modulator (DPWM). The influence of the computational delay on the precision of this equivalent DPWM model is discussed in detail. A compensation method is proposed to compensate the deviation of this DPWM model for accurately calculating the stability region with different computational delay and duty-cycle...
This paper presents an analytical model to provide a rapid estimation of the steady-state averaged power loss of a T-type STATCOM with Virtual Zero level Modulation (VZM) to balance the neutral point voltage. A case study is then conducted on a 54kVA rated T-type STATCOM system to investigate the power loss distribution over power devices and variations over switching frequency. A comparison is made...
The modular multilevel converter (MMC), is widely adopted in high voltage applications because of its simplicity and modularity. However, the current and power flow is very complicated. As a result, methods proposed for capacitor reduction, which is required to stored line frequency related circulating energy, all went through complicated mathematical derivation. C. Li proposed a state plane analysis...
This paper proposes a novel three-part hybrid rotor design for a permanent magnet synchronous machine (PMSM). The hybrid rotor can be designed to achieve key desired parameters and obtain extended speed operation by combining simple PM and reluctance rotor designs. An additional degree of freedom in the proposed three-part hybrid rotor is the flexibility to align the magnetizing axis of the reluctance...
The aim of the reduction method is to integrate the reduced model in a multi-physical electric machine optimization procedure and use the obtained model in real-time monitoring of machine critical parts. In this paper, an electric machine thermal model reduction method is proposed. Using the lumped parameter thermal network (LPTN) method, a thermal model is developed in order to represent the thermal...
A highly flexible and reliable control strategy is proposed to achieve bounded voltage and precise current sharing, which is implemented in a reverse-droop-based dc Micro-Grid. To acquire the fast-dynamic response, the reverse droop control is used to replace the V-I droop control in the primary level. In the secondary level, the containment-based controller is proposed to bound the bus voltages within...
A hybrid impedance model of Islanded MicroGrid with Paralleled Inverters Controlled by Droop and PQ Strategies (IMG-PICDPS) is derived, in which the PQ-controlled Inverters (PQ-Invs) are equivalent to Norton's circuits, while the DRoop-controlled Inverters (DR-Inv) to Thevenin's circuits in this paper. An impedance-based stability analysis method is further proposed according to the Nyquist criterion...
In this paper, a novel modeling method of battery pack for an optimal design and effective managements of battery is suggested. The proposed modeling method using single cell information makes an optimal design of battery pack possible by expecting the characteristics of the battery pack before the battery pack is manufactured. Also, the proposed battery pack model can be highly utilized in the battery...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.