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.
Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
The resonant stability problems of LCL filter have become big challenges for grid-connected inverter in weak grid. This paper takes the effect of non-minimum phase time delay on the ratio between resonance frequency and sampling frequency into account and use it to design the LCL filter. Both LCL resonance frequency and inverter-side inductor and filter capacitor related L1C resonance frequency are...
Antenna selection is a promising solution to reduce the system cost, specially for Massive MIMO systems with large scale antennas. In this paper, we consider the antenna selection problem of uplink in such MIMO system. Exact closed-form expression of this problem based on instantaneous capacity is derived. We first adopt a low complexity method with a dynamic selection coefficient. This method preserves...
Large-scale systems with arrays of solid state disks (SSDs) have become increasingly common in many computing segments. To make such systems resilient, we can adopt erasure coding such as Reed-Solomon (RS) code as an alternative to replication because erasure coding can offer a significantly lower storage cost than replication. To understand the impact of using erasure coding on system performance...
Block traces are widely used for system studies, model verifications, and design analyses in both industry and academia. While such traces include detailed block access patterns, existing trace-driven research unfortunately often fails to find true-north due to a lack of runtime contexts such as user idle periods and system delays, which are fundamentally linked to the characteristics of target storage...
Blast furnace (BF) ironmaking process is a typical complex nonlinear industrial process. Aiming at the problem that the relationship between the operating parameters and the main production indicators in BF ironmaking process mainly depends on the subjective experience of the specialized operators and experts, and is difficult to be inherited and studied later, this paper introduces data mining technology...
In consideration of the harsh environment of underwater acoustic channel and the high reliability transmission requirement, a carrier interleaved underwater acoustic MC-CDMA communication system using complete complementary sequence (MIC-CDMA/CCS) is proposed in this paper. We use OFDM modulation to reduce the complexity of the system, obtain the diversity gain by frequency domain spread spectrum,...
Underwater acoustic channel is a time varying, strong multipath, serious Doppler frequency shift, and high noise interference channel. Aiming at the requirements of strong stability and high reliability to support reliable transmission over long distance, a direct sequence spread spectrum based on single carrier underwater acoustic communication system using dual spread spectrum code (SC-CDMA/DSSC)...
The electromagnetic compatibility (EMC) margin is an important technical index of spacecraft system. In according to the test principle of margin and actual operation case of spacecraft, the paper propose feasible test methods of EMC margin for spacecraft.
As an extension to cloud computing, Mobile Edge Computing (MEC) provides computing capability at close proximity to mobile users to reduce service latency and improve users' quality of experience. In MEC, tiny datacenters, equipped with computing and storage capabilities, are located at the edge of the mobile network. Services in these tiny datacenters are supported by application-specific software...
This work analyzed the autonomic reactivity of real-scene stress. Electrocardiogram (ECG) data were acquired from 16 subjects during the final examinations of a semester and after a long winter holiday. Weak stress and strong stress datasets were constructed from the ECG data of the 16 subjects. Statistical analysis showed that there was significant autonomic reactivity difference between strong stress...
We present a hardware-friendly spatiotemporal compressed sensing framework for video compression. The spatiotemporal compressed sensing incorporates random sampling in both spatial and temporal domain to encode the video scene into a single coded image. During decoding, the video is reconstructed using dictionary learning and sparse recovery. The evaluation results demonstrate the proposed approach...
Unattended object detection is a crucial task in visual surveillance systems. However, it is challenging in handling false alarms and miss detection rate. In this paper, a two-stage method for the unattended object detection is proposed where the first stage tries to detect all possible unattended objects and prevent miss detections by considering attributes of objects such as staticness, foregroundness,...
The selection of virtualized network functions (VNFs) in service provisioning is a critical issue in inter-datacenter elastic optical networks. In this paper, considering load balancing of IT and spectrum resources, we propose two joint balancingfactors, i.e., Global Balancing factor (GB-factor) and Local Balancing factor (LB-factor) for VNFs selection. Then a Joint-Optimization Selection (JOS) algorithm...
In this paper, we set up a model of multi-tenant fairness in data center networks with flexi-grid optical networking and define the fair sharing degree (FSD) as an effective measurement of fairness. A novel max fairness (MF) scheme is proposed to ensure the fairness and minimum bandwidth of tenants. Numeric results demonstrate that the MF scheme achieves 67%–88% FSD reduction and a better stability...
We propose an enhanced Stokes Space based mode division de-multiplexing algorithm by using S0 based layered fitting (SLF) method, which can realize QPSK&16QAM hybrid modulation format de-multiplexing in few mode transmissions. The effectiveness of this method is substantiated through numerical simulations under mode division multiplexed transmission, where the modulation format carried by each...
This paper proposes joint frequency and time domain optimization of static scheduling for advance reservation (AR) requests in elastic optical networks (EONs). We formulate the problem as an integer linear program (ILP) and then propose two scheduling schemes. Simulation results show that compared with ILP, our scheme can achieve the same performance in terms of spectrum utilization with efficient...
A mode conversion-based crosstalk-aware routing, spectrum and mode assignment (MC-CA RSMA) algorithm is introduced in space-division multiplexing elastic optical networks (SDM-EONs) over few-mode fibers. Simulation results show the MC-CA RSMA algorithm can greatly reduce the impact of inter-mode crosstalk on network performance compared with benchmark algorithms.
Cloud radio access network (C-RAN) interconnects thousands of terminal devices to support the services of Internet of Things (IoT) in 5G area. However, centralized access authentication of each terminal has been performed in mobile core network which causes an extremely high operating and capital expenditure of network. Traditional C-RAN cannot provide an authentic mechanism to guarantee the security...
In this paper, we investigate the energy-efficient grooming with distance-adaptive load balancing (EEG-DALB) in flexible bandwidth optical networks. For comparison, an existing energy-efficient approach without grooming and load balancing (EEA-WGLB) is also introduced. Simulation results show that the proposed EEG-DALB achieves better performance in terms of the blocking probability and average power...
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.