Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
We present CloudShelter, an architecture to protect virtual machines' memory availability from undesired resource contention on the cloud servers. We introduce a new micro-architectural metric: Memory Round Trip Time, to quantify VMs' memory QoS. Using this metric, (1) CloudShelter defines new QoS options for customers when launching VMs. These options can guarantee VMs' memory QoS at different levels...
In order to improve the intelligent operation level of the motor operation mechanism of 126kV vacuum circuit breaker, A control method of PWM rectifier real-time adjusting drive motor speed is proposed. The equations of motion of Brushless DC motor are given, the speed response characteristic of motor is analyzed, and the controllability of motor is studied. The working principle of PWM rectifier...
Food safety is one of the hot issues in all over the world. It is related to national economy and people's livelihood. In recent years, food safety accidents occur in China frequently, so an effective food safety network public opinion early warning model is necessary and imperative. Therefore, the model of Back Propagation neural network based on Analytic Hierarchy Process (AHP-BP) is proposed. The...
This paper presents the design and analysis of high performance flat-type linear permanent magnet gears. A salient pole mover structure and a simple scheme of pole shift are proposed. Totally thirteen topologies (including those of the conventional topology and the twelve new topologies) with different mover structures are given. The corresponding prototypes with a gear ratio of −5.5:1 are optimally...
Permanent Magnet Synchronous Motors (PMSMs) operating among wide speed range needs optimal flux-weakening method to reach to higher speed level. For motors whose critical point locates within the current limit circle, two different flux-weakening algorithms are discussed comparatively in this paper. One is the traditional feedback flux-weakening control strategy, the other is a revised feedback flux-weakening...
A transmission anode flat panel X-ray source with the ZnO nanowire field emitter arrays(FEAs) has been realized. The thickness of the transmission-type flat panel X-ray target has been optimized to maximize the output intensity of X-rays. The EGSnrc-based Monte Carlo codes are utilized to simulate the X-ray intensity and spectrum generated from the target. The simulation results show that the target...
This paper presents a rapid and efficient method which can extract line segments from readings of a 2D laser sensor on a mobile robot in a indoor environment. The method includes two algorithms. One algorithm is called Divide-Region which can divide the readings of laser sensor into several continuous region. The other is called Extract-Line-Segments which can extract line segments from the divided...
This paper introduces a design of Geiger-mode SPAD array chip aiming at unmanned-vehicle LIDAR. In order to reduce the number of afterpulsings, active quenching is adopted to keep the SPAD off for a sufficiently long time after each avalanche. Through theory analysis and simulation, a TDC is shared by a column of SPADs to improve the fill factor of photosensitive parts. The monolithic array chip is...
Though in the era of big data, it remains a challenge to be tackled that the forecasting model with high accuracy and robustness needs to be built using small size samples. One effective tool of addressing this problem is the virtual sample generation (VSG), which can generate a mass of new virtual samples on the basis of small sample sets. The bootstrap method is adopted to feasibly resample the...
Control loop performance assessment and diagnosis have been attracting more and more attention in the academia and industry. Both traditional performance assessment method and minimum variance method often require the process model and provide limited information, which is not particularly convenient for practical applications. Therefore, the method based on data envelopment analysis (DEA)-related...
In this paper, the distributed optimization problem is investigated under a second-order multi-agent system. In the proposed algorithm, each agent solves the optimization via local computation and information exchange with its neighbors through the communication topology. However, in comparison with the existing second-order distributed optimization algorithms, the proposed algorithm is much simpler...
With the development of the modern industrial system, data-driven fault diagnosis methods have attracted more and more attention. Fault diagnosis of complex industrial processes based on one-dimensional adaptive rank-order morphological filter (AROMF) may miss key information because of excessive dimension reduction of process data. To solve this problem, a method combining the kernel independent...
The testing and verification is an important means to ensure the quality of GNSS receivers, which is essential in all stages of R&D. The hardware design and algorithm of high precision GNSS RF record & playback system are introduced in this paper. This system had been applied to acceptance test of Beidou2 high precision receivers and the chips in 2015. The system achieved 16bits(I&Q) bit...
With the rapid development of information security technology, Network Based Intrusion Protecting Devices(NIPD), like firewall and NIDS, holding the function of detecting and blocking network attacks, have become the primary security guard of critical information infrastructure, significantly reduced the security threat of network attack. Regarding these features, attackers are continuously pursuing...
The dual three-phase permanent magnet synchronous motor (DTP PMSM) is running in asymmetrical situations with one or more of its stator phases open circuited. Moreover, the conventional coordinate transformation can not fulfill the decoupling control of DTP PMSM. To tackle these problems, we build the unified model of DTP PMSM in all kinds of open phase fault conditions in the d-q coordinate, and...
The wind power prediction (WPP) is challenging as a large amount of data with complex nonlinear relationship should be fitted by the prediction method. To improve the accuracy, WPP based on the Multilayer Restricted Boltzmann Machine (MRBM), which is a deep learning neural network with strong feature interpretation ability, is presented in the paper. To explore the influencing factors of prediction...
Plane wave ultrasound imaging (PW) with coherent compounding can improve the image quality in terms of contrast, SNR, and lateral resolution compared to the conventional PW method. When the number of PW transmissions is small, the image quality still need improvement. In this paper, we proposed to first estimate the synthetic transmit aperture imaging (STA) data with regularized singular-value decomposition...
This paper presents an approach to steer the receiving field of view (FOV) of ultrasound imaging by linearly combining the RF signals from adjacent elements of a phased array without applying delay to the elements. The motivation is to reduce the number of measurement channels M (the product of number of transmissions, nT, and the number of receiving channels in each transmission, nR) while retaining...
Various spatial compounding techniques have been proposed to improve contrast to noise ratio (CNR) of targets in ultrasound imaging by incoherently averaging sub-aperture images. However, spatial compounding (SC) sacrificed lateral resolution due to the decreased width of the selected sub-aperture. This paper presents the application of combining the SC and modified coherence factor (CF) techniques...
Experience replay is a promising approach to improve the learning efficiency of adaptive dynamic programming. A general model-free adaptive dynamic programming (ADP) approach with the experience replay technology is investigated in this paper to solve the optimal control problems in continuous state and action spaces. Both the critic network and action network are modeled with a feedforward neural...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.