Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：本文主要结合本地新闻发展实际,首先介绍了媒体传播力、引导力、影响力和公信力的概念及其相互关系,其次,从媒体融合发展、体制机制和人才队伍建设等三个方面论述了如何加强新闻媒体传播力、引导力、影响力和公信力建设。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-04-01 Cooperative journals: 《计算机应用研究》
Abstract： In order to ensure the load balance of network storage and to avoid unrecoverable loss in case of node or disk failures, this paper proposed a distributed storage and coding scheme based on balanced data placement strategy, which gave different solutions for large caches and small caches. Firstly, the Maddah scheme is extended to multi-server system, and each file is stored as a unit in the data server by combining balanced data placement strategy to solve the large-scale cache problem. Then, the interference cancellation scheme is extended to the multi-server system. The interference cancellation scheme is used to reduce the peak rate of the cache, and the linear combination of cache segments is proposed by combining balanced data placement strategy so as to solving the problem of small caching. Finally, simulation experiments are carried out in one and two parity check server systems respectively through Linux-based NS2 simulation software. The simulation results show that the proposed scheme can effectively reduce the peak transmission rate. It has achieved better performance comparing with the other two new caching schemes. In addition, although distributed storage limits the ability to combine content from different servers into a single message, resulting in performance loss of coding and caching schemes, it can make full use of the inherent redundancy in distributed storage systems, thereby improving the performance of storage systems.
Subjects: Geosciences >> Space Physics submitted time 2016-05-03
Abstract： Millimeter-wave space-borne antennas with multi-band and multi-polarization have many advances such as high gain,low side-lobe,high beam efficiency and low loss.The operating frequency of the antenna includes 18.7,23.8 and 37.0 GHz.The use of common feed system has significance for saving volume and enhancing structure stiffness.And the ring-loaded corrugated conical horn can cover octave bandwidth.The orthomode transducer(OMT)with new turnstile junction and frequency divider was employed to separate dual polarizations signals and then divide different frequencies into their own receivers,respectively.The cross polarization levels are -32.6,-31.6 and -25.0 dB in 18.7,23.8 and 37.0 GHz,respectively.The side lobe levels are -21,-30 and -30 dB.Due to compact structure and multiple observations for one target,the simulation result demonstrates the design of feed system is suitable to space-borne antennas.
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