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Temperature-insensitive micro-displacement sensor with spindle-shaped structure single mode fiber

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Optoelectronics Letters 2025年

作者： ZHANG Weihua MU Jinlin WANG Hao WANG Dong YU Haozheng TAO Yipeng Engineering Research Center of Optoelectronic Devices and communication Technology，Ministry of Education， Tianjin Key Laboratory of Film Electronic and communication Devices， School of Integrated Circuit Science and Engineering， Tianjin University of Technology Engineering Infrastructure Department，Autonomous Driving Department Xiaomi EV Company ltd

A temperature-insensitive micro-displacement sensor based on a spindle-shaped single mode fiber (SMF) is presented and demonstrated. The SMF is bent into a balloon-shaped SMF and burned into a spindle-shaped SMF by a flame. Due to the bending of the fiber， part of the incident light leaks from the fiber core into the fiber cladding， which excites higher order cladding modes. Therefore， modal interference occurs. The experimental results show that the maximum sensitivity of the sensors is -203 pm/μm when micro-displacement varies from 0 to 80 μm. The sensors are insensitive to temperature in the range of 20-70℃. In addition， the sensors have the advantages of simple structure， low cost， small volume， high sensitivity and stability， which can be widely used in numerous high-precision industrial measurements and civil engineering structure monitoring fields.

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Performance analysis for MU-MIMO enabled LTE-U networks coexisting with D2D and WiFi network

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Digital communications and Networks 2024年第5期10卷 1289-1296页

作者： Errong Pei Chenkai Ren Wei Li Qimei Chen Bingguang Deng Jiarui Song School of communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing Jinmei communication Co. Ltd Electronic Information School Wuhan University

LTE-Unlicensed(LTE-U) network is a type of cellular communication network operating the unlicensed *** cellular traffic to WiFi or Device-to-Device(D2D) network can lead to interference among *** Multiple-Input Multiple-Output(MIMO) technology in Cellular Base Station(CBS) and WiFi Access Point(WAP) can effectively reduce interference among D2D,WiFi and cellular *** our best knowledge,there is still no literature to explicitly study the characteristics of the traffic offloading in the Multiple-User MIMO(MU-MIMO) enabled network coexisting with D2D and WiFi *** this article,we thoroughly investigate the impact of D2D communication and MU-MIMO enabled WAP and CBS on the performance of the LTE-U *** specifically,we derive the expressions of the downlink rates for cellular users,D2D users,and WiFi users with incomplete Channel State Information(CSI) feedback,and we validate our analysis through Monte-Carlo *** results illustrate the following conclusions.(ⅰ) Increasing the number of WiFi users,the length of CSI feedback,and the quantity of D2D pairs that reuse the channel with a single cellular user can increase the total throughput of the heterogeneous network.(ⅱ) The total throughput decreases when more than two users are offloaded to D2D pairs,and increases as the number of offloaded users increases when less than six users are offloaded to WiFi network.(ⅲ) Simultaneously offloading traffic to D2D pairs and WiFi network can obtain higher total throughput than offloading traffic to only one of them.

关键词： LTE-unlicensed WiFi AP MU-MIMO D2D

Register Allocation Compilation Technique for ASIP in 5G Micro Base Stations

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China communications 2022年第8期19卷 115-126页

作者： Wei Chen Dake Liu Shaohan Liu College of Information and communication Engineering Hainan UniversityHaikou 570228China Ultichip communication Technology Co.ltd. Beijing 100081China

The currently available compilation techniques are for general computing and are not optimized for physical layer computing in 5G micro base *** such cases,the foreseeable data sizes and small code size are application specific opportunities for baseband algorithm ***,the special attention can be paid,for example,the specific register allocation algorithm has not been studied so *** compilation for kernel sub-routines of baseband in 5G micro base stations is our focusing *** applications of known and fixed data size,we proposed a compilation scheme of parallel data accessing,while operands can be mainly allocated and stored in *** on a small register group(48×32b),the target of our compilation scheme is the optimization of baseband algorithms based on 4×4 or smaller matrices,maximizing the utilization of register files,and eliminating the extra register data ***,when data is allocated into register files,we used VLIW(Very Long Instruction Word)machine to hide the time of data accessing and minimize the cost of data accessing,thus the total execution time is *** indicate that for algorithms with small data size,the cost of data accessing and extra addressing can be minimized.

关键词： parallel data access compilation small size matrix 5G micro base stations register allocation algorithm

Cross-Modal Consistency with Aesthetic Similarity for Multimodal False Information Detection

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Computers, Materials & Continua 2024年第5期79卷 2723-2741页

作者： Weijian Fan Ziwei Shi State Key Laboratory of Media Convergence and communication Communication University of ChinaBeijing100024China Software Research Institute China United Network Communication Group Co.Ltd.Beijing100024China

With the explosive growth of false information on social media platforms, the automatic detection of multimodalfalse information has received increasing attention. Recent research has significantly contributed to multimodalinformation exchange and fusion, with many methods attempting to integrate unimodal features to generatemultimodal news representations. However, they still need to fully explore the hierarchical and complex semanticcorrelations between different modal contents, severely limiting their performance detecting multimodal falseinformation. This work proposes a two-stage detection framework for multimodal false information detection,called ASMFD, which is based on image aesthetic similarity to segment and explores the consistency andinconsistency features of images and texts. Specifically, we first use the Contrastive Language-Image Pre-training(CLIP) model to learn the relationship between text and images through label awareness and train an imageaesthetic attribute scorer using an aesthetic attribute dataset. Then, we calculate the aesthetic similarity betweenthe image and related images and use this similarity as a threshold to divide the multimodal correlation matrixinto consistency and inconsistencymatrices. Finally, the fusionmodule is designed to identify essential features fordetectingmultimodal false information. In extensive experiments on four datasets, the performance of the ASMFDis superior to state-of-the-art baseline methods.

关键词： Social media false information detection image aesthetic assessment cross-modal consistency

Research on Two-stage Voltage and Reactive Power Optimization Coordinated Control Method Considering Flexible On-load Tap Changer

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Dianwang Jishu/Power System Technology 2025年第1期49卷 272-283页

作者： Li, Jiaming Huo, Qunhai Yin, Jingyuan Lu, Hao Zhou, Jing Zhu, Meisheng He, Wei Dong, Hongwei Institute of Electrical Engineering Chinese Academy of Sciences Haidian District Beijing 100192 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Shijingshan District Beijing 100049 China Shanghai Jiguang Polytechnic College Baoshan District Shanghai 201901 China Three Gorges Electric Power Co. Ltd. Hubei Province Wuhan 430000 China

With the large-scale integration of distributed photovoltaic (DPV) in the distribution network, voltage exceeding limits and fluctuations are becoming increasingly severe. The voltage and reactive power optimization and coordination control method considering new power quality management devices needs to be further improved to adapt to the new changes in the power grid. This article considers the power quality regulation effect of the new flexible on-load tap changer (OLTC) and proposes a two-stage voltage and reactive power optimization coordinated control method. The first stage is the day before hour level scheduling stage. Based on distributed photovoltaic and load prediction data, the active output results of DPV and the switching results of flexible OLTC taps and capacitor banks are obtained through power flow calculation and iterative optimization. The second stage is the minute-level reactive power optimization stage. Based on the first stage, considering the reactive power output characteristics of flexible OLTC and DPV, adjusting the reactive power output of the equipment while correcting the capacitor bank switching combination in the first stage, further reducing the maximum voltage deviation of each node and making the distribution network voltage distribution more reasonable. An IEEE33 node distribution system simulation model is built in the paper. The proposed two-stage voltage and reactive power optimization coordination control method considering flexible OLTC can improve the DPV absorption level by 9.29% based on the conventional economic optimal goal of 88.07%, while meeting the requirement that the voltage deviation of the entire node is less than 0.1pu During the entire period, the overall economic efficiency improved by 7.8%. The results demonstrate the rationality and effectiveness of the proposed method. © 2025 Power System Technology Press. All rights reserved.

关键词： Quality management

Loading-Balance Relay-Selective Strategy Based on Stochastic Dynamic Program

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Tsinghua Science and Technology 2018年第4期23卷 493-500页

作者： Wei Zhao Lin Zhao Weidong Wu Sigen Chen Shaohui Sun Yong Cao Information and communication Branch Heilongjiang Electric Power Company (LTD) SGCC School of Mathematics Science Heilongjiang University

A Relay-Assisted （RA） network with relay selection is considered as a type of effective technology to improve the spectrum and energy efficiency of a cellular network. However, loading balance of the assisted relay node becomes an inevitable bottleneck in RA network development because users do not follow uniform distribution. Furthermore, the time-varying channel condition of wireless communication is also a major challenge for the RA network with relay selection. To solve these problems and improve the practicability of the RA network, a Loading Balance-Relay Selective （LBRS） strategy is proposed for the RA network in this paper. The proposed LBRS strategy formulates the relay selection of the RA network under imperfect channel state information assumption as a Multistage Decision （MD） problem. An optimal algorithm is also investigated to solve the proposed MD problem based on stochastic dynamic program. Numerical results show that the performance of the LBRS strategy is better than that of traditional greedy algorithm and the former is effective as an exhaustive search-based method.

关键词： relay-assisted network relay selection stochastic dynamic program

Blockchain for Network Slicing in 5G and Beyond:Survey and Challenges

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Journal of communications and Information Networks 2022年第4期7卷 349-359页

作者： Shihan Bao Yacong Liang Hui Xu Department of CICT Mobile communication Technology Co. Ltd.Beijing 100083China

Network slicing has gained popularity as a result of the advances in the fifth generation(5G)mobile *** slicing facilitates the support of different service types with varying requirements,which brings into light the slicing-aware next generation mobile network *** allowing resource sharing among multiple stakeholders,there is a long list of administrative negotiations among parties that have not established mutual *** ledger technology may be a solution to mitigate the above issues by taking its decentralized yet immutable and auditable ledger,which may help to ease administrative negotiations and build mutual trust among *** have been many research interests in this direction which focus on handling various problems in network *** paper aims at constructing this area of knowledge by introducing network slice from a standardization point of view to start with,and presenting security,privacy,and trust challenges of network slicing in 5G and beyond ***,this paper covers distributed ledger technologies basics and related approaches that tackle security,privacy,and trust threats in network slicing for 5G and beyond *** various proposals proposed in the literature are compared and ***,limitations of current work and open challenges are illustrated as well.

关键词： network slicing blockchain beyond 5G security privacy and trust

Faster-than-Nyquist signaling based on filter bank multicarrier modulation with joint optimization

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Journal of Systems Engineering and Electronics 2022年第6期33卷 1208-1223页

作者： CHE Hui PENG Dingxiang GUO Fachang BAI Yong School of Information and communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Ruijie Networks Co. LtdFuzhou 350002China School of Information and communication Engineering Hainan UniversityHaikou 570228China

Multi-carrier faster-than-Nyquist(MFTN)can improve the spectrum efficiency(SE).In this paper,we first analyze the benefit of time frequency packing MFTN(TFP-MFTN).Then,we propose an efficient digital implementation for TFP-MFTN based on filter bank multicarrier *** time frequency packing ratio pair in our proposed implementation scheme is optimized with the SE ***,the joint optimization for the coded modulation MFTN based on extrinsic information transfer(EXIT)chart is *** Monte-Carlo simulations are carried out to verify performance gain of the joint inner and outer code *** results demonstrate that the TFPMFTN has a 0.8 dB and 0.9 dB gain comparing to time packing MFTN(TP-MFTN)and higher order Nyquist at same SE,respectively;the TFP-MFTN with optimized low density parity check(LDPC)code has a 2.9 dB gain comparing to that with digital video broadcasting(DVB)*** with previous work on TFP-MFTN(SE=1.55 bit/s/Hz),the SE of our work is improved by 29%and our work has a 4.1 dB gain at BER=1×10^(-5).

关键词： faster-than-Nyquist filter bank multi-carrier time-frequency packing(TFP) spectrum efficiency(SE) joint optimization

A News Media Bias and Factuality Profiling Framework Assisted by Modeling Correlation

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Computers, Materials & Continua 2024年第11期81卷 3351-3369页

作者： Qi Wang Chenxin Li Chichen Lin Weijian Fan Shuang Feng Yuanzhong Wang School of Computer and Cyber Sciences Communication University of ChinaBeijing100024China State Key Laboratory of Media Convergence and communication Communication University of ChinaBeijing100024China School of Data Science and Intelligent Media Communication University of ChinaBeijing100024China Beijing 797 Audio Co. Ltd.Beijing100016China

News media profiling is helpful in preventing the spread of fake news at the source and maintaining a good media and news *** previous works only extract features and evaluate media from one dimension independently,ignoring the interconnections between different *** paper proposes a novel news media bias and factuality profiling framework assisted by correlated *** framework models the relationship and interaction between media bias and factuality,utilizing this relationship to assist in the prediction of profiling *** approach extracts features independently while aligning and fusing them through recursive convolu-tion and attention mechanisms,thus harnessing multi-scale interactive information across different dimensions and *** method improves the effectiveness of news media *** results indicate that our proposed framework significantly outperforms existing methods,achieving the best performance in Accuracy and F1 score,improving by at least 1%compared to other *** paper further analyzes and discusses based on the experimental results.

关键词： News media profiling factuality bias correlated features