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This paper proposes optimum beamforming for a system consisting of a source, a full-duplex (FD) relay, an intended destination, and an eavesdropper. The source and destination are single-antenna nodes, whereas the FD relay is a multi-antenna node. Our objective is to find the optimum receive and transmit beamformers at the relay so that the secrecy rate is maximized. The joint optimization problem...
Traditional internet architecture is challenged and it cannot satisfy the growing demand of todays networks. Information-centric Networks (ICN) is regarding as a promising replacement to meet this trend. The main characteristic in ICN is Content Store (CS), which is used to enable users to retrieve data from nearby nodes instead of remote server. However, with the limited storage capacity of routers,...
In this paper, we consider wireless information and power transfer in a cooperative multi-relay network (MRN) with relay selection. The off-grid relay terminals, which are randomly deployed within a certain cooperating area, help forward the source information to the destination following a decode-and-forward protocol. Adaptive power splitting is employed at each relay that attempts to decode the...
The Alibaba mobile recommendation competition aims at predicting the purchase behavior of users with the real users-commodities behavior data on Alibaba's m-commerce platform. In this paper, we regarded it as binary classification problems for each user/item pair, explored several important factors that closely related to purchase behaviors, extracted useful features from the data set, and made predictions...
In this paper, we study amplify-and-forward (AF) schemes to for multigroup multicast information delivery between long-distance users. The target scenario is a two-hop distributed one-way relay network where the transmitters, relays and receivers are all equipped with a single antenna. Assuming that channel state information (CSI) is perfectly known, our goal here is to design the AF weights at the...
In this paper, we study a cooperative multi-path relay channel (MPRC) in which multiple relay terminals assist in the packet transmissions from a source to the corresponding destination opportunistically. Among the relays that successfully decode the source packet, the best one in terms of the instantaneous relay-destination channel is selected to forward the decoded packet to the destination. Meanwhile,...
Under the background of popularization of higher education, higher education scale expands rapidly in our country, on which condition, the problem of employment of college students has become the focus of social attention. As the main undertaker of cultivating high-quality talents in our country, colleges and universities are also the main body for the education of university students' employment...
Non-repudiation service is widely employed in information exchange and online transaction. It requires that its participants are unable to deny their involvement in specific protocol. At the same time, the service should keep fairness, which means that no one could take any advantages over the other one. Researchers have introduced a trusted third party (TTP) to realize these demands. Protocols are...
In this paper we propose a new approach to depth estimation which combines structured light and passive stereo disparity estimation techniques to generate accurate disparity maps in both textured and textureless areas of a scene. We project a structured light pattern with adaptive colors onto the scene and simultaneously capture stereo images with a pair of cameras. By matching points in the projected...
Active Disturbance Rejection Control (ADRC) technique is proved to be very effective because it does not entirely depend on mathematical model of the plant and it can compensate the internal and external disturbances dynamically. This paper investigates the applications of ADRC in ship motion control and presents the design method of ADRC controller appropriate for both ship course control and ship...
With the development of Web service technology, SOA has so many applications in industries. How to evaluate a domain oriented service becomes an important issue at present. This paper puts forward an extended SOA (exSOA) architecture and a domain expert-based evaluation model for Web service. It evaluates the candidate service by considering the evaluation result from domain expert and the constraint...
With the development of SOA (service-oriented architecture) and SOC (service-oriented computing), the quality of service (QoS) was more and more important than before. How to access, store and measure the QoS in complex network has been a key work for the SOA. An expanded service model supporting QoS is proposed in this paper, and the model supports service publishing, selection based on QoS. In the...
The inputs and outputs of decision making units (DMUs) in conventional CCR model of data envelopment analysis (DEA) are the separate limited data, thus the relative efficiency among decision making units is evaluated at one point of the time axis. But in many real world applications, DMUs have the inputs and outputs which are the continuous functions of a time interval. In this situation, how can...
PMN (Pb(Mg1/3Nb2/3)O3) is used in many high-tech fields due to its dielectric and other advantages, the preparation of PMN by traditional methods exists some problems, such as impurity phase. In this paper a novel mechanochemical method to synthesize PMN was reported, MgO, PbO and Nb2O5 without any purification utilized as raw materials were mixed by ball-milling in advance, and the mixture was characterized...
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