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 presents a model predictive control (MPC) of dual-mode z-source inverters with capability to operate in islanded and grid-connected mode. The transition from islanded to grid-connected mode and vice versa can cause significant deviation in voltage and current due to mismatch in phase, frequency, and amplitude of grid voltage and load voltage. This paper proposes a seamless transition from...
Knowledge-intensive processes (KiPs) are driven by knowledge workers utilizing their skills, experiences and expertise. As KiPs are emergent and unpredictable by nature, their operational support is challenging. For coordinating and synchronizing their work, usually, knowledge workers rely on simple task lists like to-do lists or checklists. Though these instruments are intuitive and prevalent, their...
To avoid the stability problem of grid connected inverter caused by the conventional phase locked loop (PLL), the direct power control of voltage source inverter in virtual synchronous reference frame without PLL is investigated considering grid voltage disturbance in the paper. Based on the small signal analysis methods, comparison between conventional PLL and no PLL is made. It can be found that...
With the rapid development of the Internet, especially in recent years, the development of mobile Internet is increasingly rapid. Message push, which is an important way for mobile client to publish information and make communication, plays a significant role in mobile Internet. MQTT protocol is one of the implementation technologies of message push in Android system with low power consumption and...
This paper presents a novel video stitching system for stitching multiple images with 4K and displaying them simultaneously. The key insight of the proposed system can be divided into two stages First, a image of super resolution, such as 16K/32K, and it can be divided evenly into 2×2 or 3×3…etc. Due to the parallelized GPU, we could decode these image simultaneously based on the DXT and JPEG compression...
This paper studies the problem of lag synchronization for a kind of neural networks with mixed delays including discrete and distributed delays via adaptive intermittent control. By using stability analysis method and introducing a piecewise continuous auxiliary function, some global lag synchronization criteria are derived. It is noted that the control periods as well as the control widths in our...
This paper analyzes multi-switching network transmission synchronization (MSNTS) problem among three uncertain chaotic systems with unknown parameters. By constructing the effective switching rules, the definition of MSNTS is given and the synchronization schemes are proposed to reach synchronization between any different states of each derive system and any desired states of every respond system...
In this paper, we apply outer synchronization to identify unknown parameters existing in the node dynamics between two interacted networks. According to the coupling and interacted matrices, we design the corresponding adaptive control schemes and updating laws to achieve the outer synchronization. By the Lyapunov functional theory, we derive two theorems of the appearance of outer synchronization...
This paper proposes a novel universal control for multi-bus AC microgrid with the capability to operate in both grid-connected (GC) and islanded (IS) modes. The control scheme is based on distributed manner, and the leader-follower consensus protocol is designed. Only few leader distributed generators (DGs) receive the correction signals from the unified mode controller, which is installed at the...
Half wavelength AC transmission (HWACT) is a promising technology with unique advantages in the field of large power transmission over long distance. However, there is little study on the grid connection of HWACT, which shall be an important technical point for its engineering application. This paper deals with the point-to-grid connection of an HWACT line. Firstly, the requirements of grid connection...
This paper presents the considerations on NCR (Network Clock Reference) variations which impact on the stability of the satellite interactive system operation. We identified what kinds of factors can influence system performance in timing synchronization aspects. The amount of impacts that each factors can cause to the system operations from the realistic calculations and corresponding solutions are...
Data stored in the database mostly represent current valid state. Nowadays, complex information systems require data evolution management, state monitoring over the time. Temporal definition has been proposed, which is, however, still based on conventional paradigm. Therefore, non-current values are difficult to obtain, manage and evaluate. In this paper, several temporal evolution streams are proposed...
In this note, an adaptive fuzzy logic control (AFLC) strategy based on active sliding mode theory is considered to control a class of chaotic fractional-order systems. The main contribution in this work is the use of a saturation function to eliminate the chattering action in the control and surface signals. The nonlinear fractional order chaotic systems are identified using fuzzy logic sets. Based...
In this paper, we investigate the chaos synchronization of uncertain optical chaotic systems. More precisely, we also present a systematic approach for designing a fractional-order sliding mode controller to achieve a rapid, robust and perfect chaos synchronization. By this robust controller, it is rigorously proven that the associated synchronization error is Mittag-Leffler stable. In a numerical...
Following the recent trend in the development of the renewable energy market, complemented with the future and emerging technologies, the leading role of the grid connected converter is well established. In the future energy market, as an interconnecting element, it will serve to secure reliable power supply with extraordinary power quality characteristics. This paper will aim at presenting the basic...
In this paper, we address the use of multi-layered sliding windows to detect the presence of a wireless network for cognitive radio applications. Although synchronization signals of the Long Term Evolution (LTE) has been used as the reference system, the proposed scheme is generic in principle. Our proposed scheme doesn't require any a priori knowledge of the exact synchronization sequences, so it...
Distributed Denial of Service (DDoS) attacks serve to diminish the ability of the network to perform its intended function over time. The paper presents the design, implementation and analysis of a protocol based upon a technique for address agility called DDoS Resistant Multicast (DRM). After describing the our architecture and implementation we show an analysis that quantifies the overhead on network...
Although a number of asynchronous physical-layer network coding (PNC) schemes have been proposed, synchronous PNC may still be preferred for its simplicity. In this paper we propose a new symbol-level synchronization scheme which reduces the misalignment to less than one hardware clock cycle period. In addition, we prototype the proposed scheme on the Universal Software Radio Peripheral (USRP) platform...
State-machine replication (SMR) is a fundamental technique to implement fault-tolerant services. Recently, various works have aimed at enhancing the scalability of SMR by exploiting partial replication techniques. By sharding the state machine across disjoint partitions, and replicating each partition over independent groups of processes, a Partially Replicated State Machine (PRSM) can process operations...
Localization of wireless networks has remained an active research topic for more than a decade, as it finds more and more applications in numerous scenarios, including environment surveillance, asset tracking, and healthcare monitoring, etc. In this paper, we consider the maximum likelihood localization of a network where some of the nodes are GPS-capable while the others attempt to achieve self localization...
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.