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.
Based on the daily meteorological data of 23 meteorological stations during 1960–2013 across the study area and its surroundings, the spatiotemporal variation of drought frequency of winter wheat is investigated by using the crop water deficit index (CWDI). The results show that during the entire growth period, the sequence of drought frequency is extreme drought > severe drought > moderate...
Cooperative Vehicle Infrastructure System is an important research area of ITS. Evaluation of CVIS aims to evaluate the technical feasibility, economic benefit and the social effects of CVIS. This paper puts forward a comprehensive evaluation method based on Analytic Hierarchy Process (AHP) and Grey Relational Analysis Process (GRAP). It selects parameters which can reflect the performance of traffic...
The sizes of hidden data sources are of great interests to public, researchers and even business competitors. Estimating the size of hidden data sources has been a challenging problem. Most existing methods are derived from the classic capture-recapture methods. Another approach is based on a large query pool. This method is not accurate due to the large variance of the document frequencies of queries...
A network system can be composed of a variety of heterogeneous network, using various transmission media with different topological structure and adopt the corresponding multiple channel access control methods, so the network transmission performance evaluation is very complicated, and the analysis method is based on the original wired communication network, unable to reflect the complex network environment,...
The evaluation and selection for disposition plans of ex-service equipment is a multipurpose process with abundant uncertain factors. The paper builds up the evaluating index system of disposition plans of ex-service equipment, taking a kind of ex-service mobile kitchen trailer as an example, uses analytic hierarchy process method to give weights to the index system, adopts fuzzy comprehensive evaluation...
Egypt has the largest and most significant higher education system in the Middle East and North Africa but it had been continuously facing serious and accumulated challenges. The gap between what is existing and what is supposed to be for the self-regulation and improvement processes is not entirely clear to face these challenges. The effective use of information technology in higher education requires...
This study discusses a design method for controlling a weigh feeder which has been employed to dispense material at a specified rate. In this study, a proportional-integral (PI) control law is designed based on a generalized minimum variance control (GMVC) law. The control performance of the designed control system is evaluated using a minimum variance index. Based on the evaluated control performance,...
Active crop canopy sensors are commonly used to estimate crop nitrogen (N) status in precision N management to improve N use efficiency and reduce negative environmental impacts caused by over-application of N. However, traditional vegetation indices (VI) like normalized difference vegetation index (NDVI) obtained from GreenSeeker sensor can become saturated under medium to high crop biomass conditions,...
One of the steps of geometric modeling is to know the topology and/or the geometry of the objects considered. This paper presents different data structures and algorithms used in this study. We are particularly interested by algebraic structures, eg homotopy and homology groups, the Betti numbers, the Euler characteristic, or the Morse-Smale complex. We have to be able to compute these data structures,...
The coach evaluation system is established in this paper by using fuzzy mathematics model. The necessity and main principles of the coach evaluation system are analyzed. First of all, Delphi method and frequency statistics method are used to determine the indexes of the evaluation system, and then the weight of each index is calculated by Analytic Hierarchy Process (AHP) and literature method. Secondly,...
Leaf area index (LAI) plays a significant role in the structure and the functioning of vegetation. Moderate-resolution remote sensed LAI products can be applied to monitor the crop growth, yield and global change. However, the products must be validated against in-situ observations before being used, which requires the upscaling of in-situ LAI to footprint scale of remote sensing. In this study, a...
The electroencephalogram (EEG) signals were usually contaminated by electromyography (EMG) signals. By using the multivariate empirical mode decomposition (MEMD), we proposed the MEMD-based method to remove EMG artifacts from the EEG signals. Firstly, the EEG signals were decomposed by the MEMD into multiple multivariate intrinsic mode functions (MIMFs) with different frequency bands. Then the power...
Fingerprint biometric is one of the most successful biometrics applied in both forensic law enforcement and security applications. Recent developments in fingerprint acquisition technology have resulted in touchless live scan devices that generate 3D representation of fingerprints, and thus can overcome the deformation and smearing problems caused by conventional contact-based acquisition techniques...
In the traditional fuzzy connectedness (FC) method, the notion of “hanging togetherness” of image elements specified by their fuzzy connectedness is presented sufficiently. However, the segmentation performance is largely determined by the specified fuzzy affinity; and the FC method generally has disadvantages such as sensitive to the noise, difficult to determine an appropriate threshold in the case...
Focus on the risk management for the modern weapon equipment development projects, the intuitionistic fuzzy group decision-making ranking process is proposed in this paper to achieve a further risk ranking for the risks with the same risk exponent, making the ranking results more accurate and scientific. In this process, assessments are made on the risks' occurring possibility and the consequences...
Hubs are the data instances appearing frequently on the nearest neighbours lists. As the hubs of a high-dimensional dataset are close to the centres of clusters or sub-clusters, some of them are selected as the centres of clusters by hub based clustering algorithms. In the process of hub selection, these algorithms rank data instances in terms of their global hubness scores computed upon their nearest...
With the development of sensor network, the number of sensors are increasing now. In order to manage sensor data, W3C has proposed semantic sensor web which unifies sensor network data and produces massive RDF dataset. Linked Sensor Data is a normal dataset of semantic sensor web and links into Linked Open Data based on SSN ontology. HBase is a kind of distributed database and suits for the management...
Video tools developed today, teachers can record lecture videos and upload these lecture videos to e-learning system themselves. However, some students may only do not understand some fragments but they have to waste unnecessary time download entire video, and therefore video scene segmentation is relative importance. In addition, in traditional teaching model, students must listen and transcribe...
Tachycardia is often seen during epileptic seizures, but it also occurs during physical exercise. In order to assess whether focal epileptic seizures can be detected by short term moving window Heart Rate Variability (HRV) analysis, we modified the geometric HRV method, Lorenz plot, to consist of only 30, 50 or 100 R-R intervals per analyzed window. From each window we calculated the longitudinal...
In this study, a framework able to classify online different levels of mental workload induced during a simulated flight by using the combination of the Electroencephalogram (EEG) and the Heart Rate (HR) biosignals has been proposed. Ten healthy subjects were involved in the experimental protocol, performing the NASA — Multi Attribute Task Battery (MATB) over three different difficulty levels in order...
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.