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This paper considers the performance of the return link for the hybrid satellite terrestrial communication systems (HSTCSs) under the terrestrial interference. The hybrid beam models are proposed by considering the equivalent inter-beam interference factor α from adjacent beams and the intra-beam equivalent interference factor β from the terrestrial communication systems (TCSs). We set up the channel...
The primary task in preprocessing image is moving estimation and compensation of image senor, that is to say, correction problem of image background. In this paper, a new method of motion background compensation based on robust regression is proposed. The background motion velocity is calculated by the estimation of the optical flow field model. Then robust iterative weighted least square method is...
Multibeam satellite communication systems (MSC-Ss) have been applied to provide efficiently power and bandwidth utilization for broadband service by employing frequency reuse. However, bandwidth for each beam is divied by frequency reuse which is used to mitigate the adjacent beam interference. Recently researchers resorted precoding as a novel interference mitigation technique to achieve full frequency...
Relay strategies can increase coverage range and improve reliability for power-limited sensors. In this study, cooperative jamming schemes are investigated for security communications in two-hop multi-sensors relay networks where a passive eavesdropper can wiretap the relay channels in both hops. The normally inactive nodes can be used as cooperative jamming sources to confuse the eavesdropper. Artificial...
In this paper, an investigation into the topology structure design and performance analysis the distributed satellite cluster network (DSCN) in space information networks (SINs) at geosynchronous orbit (GEO) is presented. Use of concepts of domains, strong/weak link, hubs, small world, and degree realizability by employing Network Science Theory is examined for a fifteen-node DSCN. The impacts of...
Aiming at product information management in modern enterprise, the warehouse management system in this paper uses the J2EE architecture and is based on B/S mode. It uses SSH, the more popular integrated open-source framework in web application, improves the security and reliability of the system. This paper mainly introduces architecture and database design of the system. The design of user permissions...
In this paper, physical layer security techniques are studied for the downlink of multiuser multi-input multi-output (MIMO) networks. We aim at minimizing the total transmit power such that individual secrecy rate is satisfied for each user. An iterative joint power control and transceiver beamforming algorithm is developed to achieve this goal. The proposed algorithm is realized by solving the two...
In this paper, the quality of service (QoS) metrics and user demand model are established in high altitude platforms (HAPs) broadband communication network. A methodology of mobile base station placement is proposed with QoS and user demand guarantee for the first time. Besides, the HAPs placement optimization framework is established by optimizing the design vector (DV) to maximize network capacity...
Development of strong and smart electric power grids requires better solutions for short-circuit fault current control. Besides system optimization, effective fault current limiting hardware will provide meaningful options for utilities to deal with fault current control. Superconducting fault current limiter (SFCL) has superior properties as a fault current limiting device. An SFCL can have very...
Ruin probability is an important scale of measurement for insurance company, for it can know own compensation ability well, so it is important to research ruin probability's advancing expansion for its stable manage. In this paper, we consider the classical risk model, assuming that the tail of claim-size is second-order regular variation. First we prove the closeness of second-order regular variation,...
To adapt to the demand of agile reengineering of business process in Business Process Management System, a kind of software model which based on message computing is proposed. Aiming at conducting varied modeling of the business process variation type through the message transferred between functional activity and connector, the model is made up by business functional activities and logic calculation...
In order to address the agile adjustment in functional activities in business process reengineering, a variable business process model is proposed to achieve a flexible and variable business process mode. Against the variability characteristics of the business process, variability modeling method is applied to messages which transfer between the functional activities. The logical calculation in messages...
In order to do process mining better in the Business Intelligence environment, the proper process mining model and the right evaluation method to assess the mining results become the key issues. This paper is based on both theoretical and technological achievements in process mining area, putting forward a process mining model under event log mode, providing the analysis process of selecting evaluation...
Silver nanoparticles for metal-enhanced fluorescence (MEF) have been successfully synthesised by pulsed electrodeposition of silver in the anodic aluminium oxide (AAO) templates. X-ray diffraction and scanning electron microscopy indicate that the as-synthesised samples were composed of face-centred cubic Ag nanoparticles and the average nanoparticle size increased with the increasing electrodeposition...
To support agile management, enterprises would face the challenges of designing and executing flexible management model. In this paper, we present a novel Customized Management (CM) model based on given goals. First, the knowledge base is established to store the standardized scenario data involved with business goals with the help of business experts. Then based on such knowledge base, a customized...
In web services-based applications, Web applications can be composed of hundreds of web services. Hence, application system quality depends on the quality of the involved web services. When the service evolves, it may not satisfy anymore the requirements of end user (anyone who use the web service). Any change of a web service, it must be re-tested at the unit level, and re-used to form services-based...
In the current distributed network, the grid computing technology has already been an important technology widely used in resource sharing and resource cooperation. Resource sharing usually participates in the grid activities by joining the Virtual Organization (VO) to achieve the cooperation tasks, so the VO is an important technology, which resources can participate into grid events, collaborative...
The relationship between armature induced voltage and speed of wire-feeding motor in buck chopper PWM speed-control system is analyzed. A pulse-width modulation (PWM) speed-control system based on digital control is used to adjust the speed of wire-feeding motor, which can eliminate the effect of load current on the speed of wire-feeding by sampling armature voltage synchronously at the moment of...
With the continuously increasing of the sorts of the services, as well as the expanding of the current network capacity, Deep Packet Inspection (DPI) has played more and more vital role in the network and the information security. The existing regular expression matching algorithms and the related improvement algorithms already could not satisfy the demands for the high-speed and real-time. This article...
Arc blowing out and current impacting at commuting often occur in variable polarity inverter TIG welding. Equivalent capacitors and inductors of the main circuit slower the current commuting speed and cause arc blowing out. Equivalent resistance of welding arc decreases suddenly and causes current impacting when DCEP (direction current electrode positive) is commuting to DCEN (direction current electrode...
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