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.
With China Remote Sensing career advancement, a large number of independent researches and development satellites have launched. Among a new generation of high-resolution satellites, GaoFen-1 (GF-1) stands out. It sets high spatial resolution (2 m-16 m), multi-spectral and high temporal resolution (4-day) with 60 km-800 km swath in a fusion technology with strategic significance. In order to explore...
Two GF-1 WFV images on August 3, 2015 and October 2, 2015 were selected to extract the cultivated area of paddy rice in Jianhu county of Jiangsu Province. Vegetation indexes were extracted from the original spectrum data in order to extract paddy rice area with Maximum Likelihood Classifier (MLC), Support Vector Machine (SVM) and Classification and Regression Trees (CART). The extraction accuracy...
Agricultural landscape is designated as important landscape components for partly controlling water quality, biodiversity, as well as for their aesthetic role in landscapes. Therefore, the change of agricultural landscape is at the top of the agenda for many policy makers and landscape planners. As a basis for conservation management, sufficient information about landscape structure should be providing...
Crop phenology is a critical component of implementing agricultural activities and providing important indicators for climate related research. The needs for crop phenology estimation not only exist in large scale but also in medium or small scale. In this work, Jianhu County was chosen to test the ability of crop phenology estimation by Moderate Resolution Imaging Spectroradiometer (MODIS) data....
The detection of vehicle seat Strength and fatigue is closely related to the quality of the car and the safety of the passengers, which requires high accuracy including short response time, little overshoot, few oscillations and small steady-state error. The conventional PID controller can not satisfy the requirement of high accuracy because of its fixed parameters. In view of the poor performance...
The antenna subarray formation (ASF) is a promising technique for multiple-input multiple-output (MIMO) receiver. For MIMO wiretap channels, we employ the ASF matrix at the legitimate receiver and propose new alternative optimization (AO) scheme which jointly designs transmit covariance matrix and ASF matrix to maximize the secrecy capacity. Simulation results have shown that the proposed ASF schemes...
Existing quality assessment methods of contrast-distorted images have excellent performance by obtaining information of reference images. However, in actual life, there are not any reference images. To deal with this problem, we propose a simple yet promising no-reference quality assessment algorithm based on the human perception features for contrast-distorted images. First, human visual perception...
In this Letter, we present a simple yet effective no-reference image blur assessment algorithm based on local total variation. Firstly, we calculate a local image blurriness metric by total variation. Then, the average of the largest 1% local total variation is computed. Finally, we obtain the blur score via a five-parameter logistic regression. The performance of the proposed algorithm is evaluated...
Network virtualization is a double-edged sword that facilitates network innovation but may cause information leakage between virtual nodes coexisting on the same substrate node via covert channels. This paper represents the first attempt to consider risk-tolerant coexistence in virtual network embedding. We propose a secure virtual network embedding scheme to mitigate the risk of covert channel attacks...
The dynamic load strength test of bumper system is an important parameter for vehicle passive safety, but different test standards, different test requirements, which caused much trouble to the test authority. So dynamic and energy analysis based on bumper system low-speed collision test is very impotant. Build parameterized model of bumper system, analyse the dynamic characteristics and energy conversion...
The switch reliability test of automobile tail gate is an important parameter for the safety of the car, operation of the driver, convenience of passengers, feature of air dynamics, leak tightness, noises and the shape of the car, but different test standard, different test method, which caused much trouble to the test procedure. To solve the shortcomings of the traditional machines, such as less...
This paper proposes a new protocol CDS, which is based on modification of DSR routing protocol. CDS routing protocol leverages on collaboration to optimize bottleneck and improve the whole performance of transmission path. The simulation result of NS2 indicates that CDS routing protocol outperforms DSR and full path collaborative routing protocol.
Distributed control plane is a promising approach to a scalable software-defined networking (SDN). However, traffic changes could incur load imbalance among individual controllers. Live migration of switches from controllers that are overloaded to those that are underutilized may be a solution to handle peak switch traffic using available control resource. Such migration has to be performed with a...
One of the most fundamental issues in network virtualization is the virtualization of the substrate nodes. Reconfigurable Router (RR) realizes a flexible router architecture based on the idea of hardware virtualization which is performed by component-based processing and reconfiguration. But if the components are incompatible with each other in terms of performance, the RR will get lower performance...
In network virtualization, virtual network embedding is mostly static, which maps each virtual link onto a single predictable path, thus offering a significant advantage for adversaries to eavesdrop or intercept a certain virtual network. However, existing works on multipath embedding just focus on performance and survivability, instead of maximizing the routing unpredictability to avoid link attacks...
With network virtualization more and more popular, how to protect the virtual networks (VNs) from a single substrate link failure is increasingly important. Existing protection schemes like dedicated backup and shared backup, suffer from high resource cost and delayed recovery, respectively. To offer instantaneous recovery with less redundant resource, in this paper, we propose a coding-aware VN mapping...
When MANET is connected into the Internet, the gateways are the entry points of all traffic between the hybrid networks. Usually, a large amount of traffic load may become concentrated in some gateways and congestion occurs. To resolve this problem, this paper proposes a load balancing routing algorithm, called LBRA, in MANET to distribute the traffic load among multiple gateways. Through simulation,...
This paper analyses the properties of raw wind data and proposes a novel wind data pre-processing method. Firstly, the raw wind data are divided into six categories according to their attribute magnitudes. The statistical characteristics of the data reveal that the invalid data can be considered as outliers compared to the valid ones. Then the LOF algorithm and a firstly designed weighted distance...
Noise variation is an important parameter for many image denoising algorithms. This paper proposed a new two-step noise variation estimation algorithm based on image segmentation. In the first step, noisy image was smoothed and segmented by statistical region merge (SRM) algorithm. Then variation of every region was computed, and some regions were selected based on statistical rule to estimate the...
On the tie-line of interconnected power systems, there inevitably exist power fluctuations. Overlarge undulations on tie-lines threaten the stability and security of the system. It is remarkable that when the control areas are larger, the situation becomes more austere. In this paper, based on the practical data of two large interconnected power systems, the stochastic power fluctuations of the tie-line,...
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.