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MEASUREMENT OF SCINTILLATION OF RADIOWAVE SIGNALS THROUGH IONOSPHERE

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Journal of Electronics(China) 1989年第3期6卷 282-285页

作者：黄其凡 institute of Standardization and Planning the Ministry of RadioFilm and TelevisionBeijing

A theoretical formula for measuring the power-law spectrum with interferometer is presented inthis paper for the study of *** results of theoretical calculation agree well with *** radio scintillation power-law spectr... 详细信息

关键词： Electromagnetic wave propagation Random media Ionosphere Scintillation

Controlling Spatiotemporal Chaos Using Nonlinear Feedback Functional Method

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Chinese Physics Letters 1997年第11期14卷 823-826页

作者： FANG Jin-qing M.K.Ali FANG Qing China institute of Atomic Energy Beijing 102413 Department of Physics The University of LethbridgeLethbridgeAlberta TlK 3M4Canada Beijing institute of television Technology Beijing 100031

Nonlinear feedback functional method for controlling spatiotemporal chaos is *** a key point,some typical kinds of nonlinear feedback functions are *** efficiency and robustness of the method based on the flexibility ... 详细信息

关键词： Nonlinear nonlinear Chaos

Effect of Rare Earths on Mechanical Properties and Microstructures of Si_3N_4-based Ceramics

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Journal of Rare Earths 2000年第1期18卷 27-29页

作者：穆柏春李明由向群刘秉余谷志刚刘大玮 Department of Material Engineering Liaoning Institute of Technology Jinzhou 121000 China television University Jinzhou Railway Bureau Jinzhou 121000 China Jinzhou Products Quality Testing institute Jinzhou 121000 China

The effects of Y2O3d, La2O3 and Nd2O3 on the mechanical properties and microstructures of Si3N4-hased ceramics were studied. It shows that a significant improvement in mechanical properties can be obtained by adding rare earths oxides in Si3N4. The fracture toughness and the fie-cural strength of Si3N4 added with both Y2O3 and La2O3 are 7. 8 MPa.m1/2 and 962 MPa, respectively. The main reason is that adding rare earths in Si3N4 can improve the microstructure of the material and increase the aspect ratio of β-Si3N4 grain.

关键词： rare earths Si_(3)N_(4) mechanical property microstructure

BRIEFING ON CHINA'S SATELLITE COMMUNICATIONS PROGRESS AND FUTURE

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China Communications 2013年第10期10卷 I0001-I0003页

作者： HAO Weimin China Users Association for Satellite Communications Broadcasting and Television Satellite Communications Committee China Institute of Communications

In *** has been tremendous progress in the area of satellite communications and its applications over the past 40years.A space segment with extensive satellite resources for fixed satellite services has been set up,and it offers high-quality services to customers in China and Asia Pacific.A satellite communications network of certain scale has been established,and it meets various business requirements and plays a complementary and extended role to the terrestrial communications *** is also used as an effective emergency *** present,a large-scale satellite broadcasting and television transmission network is in service,and it has significantly contributed to broadcasting and television coverage in China.

关键词：中国卫星通信讲座卫星固定业务亚太地区空间段

A Unified Model Fusing Region of Interest Detection and Super Resolution for Video Compression

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Computers, Materials & Continua 2024年第6期79卷 3955-3975页

作者： Xinkun Tang Feng Ouyang Ying Xu Ligu Zhu Bo Peng School of Computer and Cyber Sciences Communication University of ChinaBeijing100024China Cable television Technology Research institute Academy of Broadcasting ScienceBeijing100866China

High-resolution video transmission requires a substantial amount of *** this paper,we present a novel video processing methodology that innovatively integrates region of interest(ROI)identification and super-resolution *** method commences with the accurate detection of ROIs within video sequences,followed by the application of advanced super-resolution techniques to these areas,thereby preserving visual quality while economizing on data *** validate and benchmark our approach,we have curated a new gaming dataset tailored to evaluate the effectiveness of ROI-based super-resolution in practical *** proposed model architecture leverages the transformer network framework,guided by a carefully designed multi-task loss function,which facilitates concurrent learning and execution of both ROI identification and resolution enhancement *** unified deep learning model exhibits remarkable performance in achieving super-resolution on our custom *** implications of this research extend to optimizing low-bitrate video streaming *** selectively enhancing the resolution of critical regions in videos,our solution enables high-quality video delivery under constrained bandwidth *** results demonstrate a 15%reduction in transmission bandwidth compared to traditional super-resolution based compression methods,without any perceivable decline in visual *** work thus contributes to the advancement of video compression and enhancement technologies,offering an effective strategy for improving digital media delivery efficiency and user experience,especially in bandwidth-limited *** innovative integration of ROI identification and super-resolution presents promising avenues for future research and development in adaptive and intelligent video communication systems.

关键词： Super resolution region of interest detection video compression

Research on Sarcasm Detection Technology Based on Image-Text Fusion

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Computers, Materials & Continua 2024年第6期79卷 5225-5242页

作者： Xiaofang Jin Yuying Yang YinanWu Ying Xu School of Information and Communication Engineering Communication University of ChinaBeijing100024China Cable television Technology Research institute Academy of Broadcasting ScienceBeijing100053China

The emergence of new media in various fields has continuously strengthened the social aspect of social *** tend to express emotions in social interactions,and many people even use satire,metaphors,and other techniques to express some negative emotions,it is necessary to detect sarcasm in social comment *** sarcasm,the more reference data modalities used,the better the experimental *** paper conducts research on sarcasm detection technology based on image-text fusion *** effectively utilize the features of each modality,a feature reconstruction output algorithm is *** algorithm is based on the attention mechanism,learns the low-rank features of another modality through cross-modality,the eigenvectors are reconstructed for the corresponding modality through weighted *** only the image modality in the dataset is used,the preprocessed data has outstanding performance in reconstructing the output model,with an accuracy rate of 87.6%.When using only the text modality data in the dataset,the reconstructed output model is optimal,with an accuracy rate of 85.2%.To improve feature fusion between modalities for effective classification,a weight adaptive learning algorithm is *** algorithm uses a neural network combined with an attention mechanism to calculate the attention weight of each modality to achieve weight adaptive learning purposes,with an accuracy rate of 87.9%.Extensive experiments on a benchmark dataset demonstrate the superiority of our proposed model.

关键词： Sentiment analysis sarcasm detection feature fusion feature reconstruction

LOOP-SHIFT S&G ADAPTIVE FILTER AND ITS APPLICATION IN SEPARATION OF OVERLAPPED PERIODIC BIOMEDICAL SIGNALS

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Journal of Electronics(China) 1995年第2期12卷 97-104页

作者：朱贻盛李宏志戴辉 Shanghai Jiaotong University Shanghai 200030 television institute Hefei 230026 Chicago University U.S.A.

A Loop-Shift Stop & Go Adaptive Filter(LSSGAF) with applications in period detection and signal separation of overlapped periodic signals is presented. The filter places no constraints on the overlapped forms in frequency domain and requires no priori knowledge except for approximate period range of signals to be separated, therefore it provides for an efficient and feasible method to separate periodic signals overlapped both in time and frequency domains. The convergence conditions of the filter and the requirements of all parameter selections are discussed, meanwhile a rough scanning and channel auto-shut algorithm is proposed to reduce the amount of calculation in the searching stage. Experiments show that the filter can separate all kinds of overlapped periodic signals with different initial phases and different relative magnitudes.

关键词： Adaptive filter Periodic signal Convergence

Research on virtual node placement optimization strategy of cloud platform for information acquisition

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High Technology Letters 2018年第3期24卷 279-286页

作者：帅愉燕 Wei Gaofeng Zhang Zhaoxin Zhang Lizhe School of Computer Science and Technology Harbin Institute of Technology Rongcheng Relay Station Weihai Radio and Television Station Information Security Evaluation Center of Civil Aviation Civil Aviation University of China

A virtual node placement strategy based on service-aware is proposed for an information acquisition platform. The performance preferences and types of services in the information acquisition platform are analyzed as well as a comparison of the running time of services both in virtual node centralized and decentralized placing. All physical hosts are divided into different sub-clusters by using the analytic hierarchy process( AHP),in order to fit service of different performance preferences. In the sub-cluster,both load balance and quality of service are taken into account. Comparing with the heuristic algorithm,the experiment results show that the proposed placement strategy is running for a shorter time. And comparing with the virtual node placement strategy provided by OpenStack,the experiment results show that the proposed placement strategy can improve the execution speed of service in the information acquisition platform,and also can balance the load which improves resources utilization.

关键词： virtual node placement service-aware performance preference analytic hierarchy process (AHP) load balance

Effects of Sc doping on electrical conductivity of BaZrO_3 protonic conductors

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Rare Metals 2012年第1期31卷 71-74页

作者： Guo, Ruisong Wu, Lijun Ren, Jianxun Zhang, Jianfang Jiang, Hong Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Educatton Tianjin University Tianjin 300072 China No.53 institute of China Ordnance Industry Group Jinan 250031 China Guizhou Broadcasting and television College Guiyang 550004 China

BaZr1-xScxO3-0.5x (x=0.07,0.10,0.13,0.16) powders were prepared by solid-state reaction method,and ZnO was used as sintering *** with different amount of ZnO additive were sintered at 1450·C for 6 h in *** cubic perovskite phase proton conductors were *** was measured by electrochemical *** was shown that Sc doping could increase conductivity through enhancing the carrier concentration in the material,but excessive Sc content might decrease the carrier concentration because of its charge *** had an influence on carrier concentration and mobility and affected the electrical conductivity.2 mol% ZnO and 13 mol% ScO1.5 doped sample showed the highest DC conductivity of 3.6×10-3 S·cm-1 tested at 800·C in wet hydrogen atmosphere.

关键词： protonic conductor perovskite carrier concentration mobility