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Hybrid Block Diagonalization Precoding for Multi-User Weighted Sum-Rate Maximization

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China Communications 2024年第8期21卷 127-141页

作者： Su Xiaofeng Jiang Yi Key Laboratory for Information Science of Electromagnetic Waves(MoE) Department of Communication Science and EngineeringFudan UniversityShanghai 200433China

This paper studies large-scale multi-input multi-output(MIMO)orthogonal frequency division multiplexing(OFDM)communications in a broadband frequency-selective channel,where a massive MIMO base station(BS)communicates with multiple users equipped with *** develop a hybrid precoding design to maximize the weighted sum-rate(WSR)of the users by optimizing the digital and the analog precoders *** the digital part,we employ block-diagonalization to eliminate inter-user interference and apply water-filling power allocation to maximize the *** the analog part,the optimization of the PSN is formulated as an unconstrained problem,which can be efficiently solved by a gradient descent *** results show that the proposed block-diagonal hybrid precoding algorithm can outperform the existing works.

关键词： block-diagonal gradient descent hybrid precoding iterative optimization MIMO-OFDM multi-user water-filling power allocation weighted sum-rate maximization

Integrated Framework for Vehicle Interior design Using digital Human Model

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Journal of Computer Science & Technology 2009年第6期24卷 1149-1161页

作者： Moonki Jung Hyundeok Cho Taehwan Roh Kunwoo Lee department of Mechanical and Aerospace Engineering Seoul National University Institute of Advanced Machinery and design Seoul National University

Evaluating the human friendliness of vehicles is essential for designing new vehicles since large numbers of human-machine interactions occur frequently inside vehicles. In this research, we develop an integrated framework for vehicle interior design using a digital human model （DHM）. In this framework, the knowledge-based parametric modelling function of vehicles is implemented using a commercial computer-aided design （CAD） system. The combination of the DHM and the CAD system enables designers into carry out ergonomic evaluations of various human-vehicle interactions and understand the effects of modifications of vehicle design parameters on occupants during designing. Further, the information on human-vehicle interaction obtained using this system can be transmitted to dedicated biomechanical analysis software. By analysing human motions inside vehicles using such software, we can obtain optimized interior design parameters.

关键词： digital human models ergonomics human-centred CAD vehicle interior design

Precise 3D shape measurement of three-dimensional digital image correlation for complex surfaces

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Science China(Technological Sciences) 2018年第1期61卷 68-73页

作者： YAN TianHao SU Yong ZHANG QingChuan CAS Key Laboratory of Mechanical Behavior and design of Materials Department of Modern Mechanics University of Science and Technology of China

Three dimensional-digital image correlation （3D-DIC） is a widely used optical metrology in the experimental mechanics community because of its reliability, practicality, and flexibility. Although the precision of digital image correlation （DIC） has been thoroughly studied theoretically and numerically, verification experiments have seldom been performed, especially fbr complex surfaces with a small field of view （FOV）. In this work, the shape of a 1-yuan coin was measured using 3D-DIC; the shape was complex due to the presence of many fine details, and the FOV was relatively small because the coin diameter was only 25 mm. During the experiment, a novel strategy for speckle production was developed： white paint was simply sprayed onto the surface. Black paint was not used; instead, taking advantage of the reflective nature of the coin surface, polarized light and a Polaroid filter were introduced, and the polarization direction was carefully adjusted, ensuring that the spray pattern was extremely thin and that high-quality speckle images with significant contrast were captured. The three-dimensional coin shape was also successfully determined for comparison using a stylus profiler. The results demonstrate that 3D-DIC provides high precision in shape measurement even for complex surfaces with small FOV. The precision of 3D-DIC can reach 1/7000 of the field of view, corresponding to about 6 ~tm in this experiment.

关键词： three-dimensional digital image correlation(3D-DIC) measurement precision complex surfaces small field of view polarized light polaroid filter

An LSTM Based Forecasting for Major Stock Sectors Using COVID Sentiment

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Computers, Materials & Continua 2021年第4期67卷 1191-1206页

作者： Ayesha Jabeen Sitara Afzal Muazzam Maqsood Irfan Mehmood Sadaf Yasmin Muhammad Tabish Niaz Yunyoung Nam department of Computer Science COMSATS University IslamabadAttock CampusPakistan department of media design and Technology Faculty of Engineering&InformaticsUniversity of BradfordBradfordBD71AZUK department of Smart Device Engineering School of Intelligent Mechatronics EngineeringSejong UniversitySeoulKorea department of Computer Science&Engineering Soonchunhyang UniversityAsan36538Korea

Stock market forecasting is an important research area,especially for better business decision *** stock predictions continue to be significant for business *** short-term stock market forecasting is usually based on historical market data analysis such as stock prices,moving averages,or daily ***,major events’news also contains significant information regarding market *** effective stock market forecasting system helps investors and analysts to use supportive information regarding the future direction of the stock *** research proposes an efficient model for stock market *** current proposed study explores the positive and negative effects of coronavirus events on major stock sectors like the airline,pharmaceutical,e-commerce,technology,and *** use the Twitter dataset for calculating the coronavirus sentiment with a Long Short-Term Memory(LSTM)model to improve stock *** LSTM has the advantage of analyzing relationship between time-series data through memory *** performance of the system is evaluated by Mean Absolute Error(MAE),Mean Squared Error(MSE),and Root Mean Squared Error(RMSE).The results show that performance improves by using coronavirus event sentiments along with the LSTM prediction model.

关键词： Business intelligence decision making stock prediction long short-term memory COVID-19 event sentiment

Examining the use of narrative constructs in data videos

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维普期刊数据库

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Visual Informatics 2020年第1期4卷 8-22页

作者： Ruochen Cao Subrata Dey Andrew Cunningham James Walsh Ross T.Smith Joanne E.Zucco Bruce H.Thomas The School of Information Technology and Mathematical Science University of South AustraliaAustralia department of media University of AdelaideAustralia

Data videos are a highly impactful method of communication and are becoming a prevalent medium for communicating *** the majority of current research focuses on the cinematic aspects of data videos,very little is known about the narrative methodologies *** paper presents our insights derived from an initial exploration of this *** present a taxonomy based on the analysis of 70 existing data videos examining their narrative and visual *** propose that our taxonomy can be used to explain the characteristics or design of data *** this taxonomy,we present our observations,including the trend of popular technologies applied in current data videos,the under-utilization of promising methods,and highlight research opportunities in the field.

关键词： Narrative visualization Data videos Taxonomy Narrative approaches

digital twin-enabled smart facility management: A bibliometric review

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维普期刊数据库

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Frontiers of Engineering Management 2024年第1期11卷 32-49页

作者： Obaidullah HAKIMI Hexu LIU Osama ABUDAYYEH department of Civil and Construction Engineering Western Michigan UniversityKalamazooMI 49008-5316USA

In recent years,the architecture,engineering,construction,and facility management(FM)industries have been applying various emerging digital technologies to facilitate the design,construction,and management of infrastructure *** twin(DT)has emerged as a solution for enabling real-time data acquisition,transfer,analysis,and utilization for improved decision-making toward smart *** research on DT for FM has been undertaken in the past *** paper presents a bibliometric analysis of the literature on DT for FM.A total of 248 research articles are obtained from the Scopus and Web of Science *** is then utilized to conduct bibliometric analysis and visualize keyword co-occurrence,citation,and co-authorship networks;furthermore,the research topics,authors,sources,and countries contributing to the use of DT for FM are *** findings show that the current research of DT in FM focuses on building information modeling-based FM,artificial intelligence(AI)-based predictive maintenance,real-time cyber–physical system data integration,and facility lifecycle asset *** areas,such as AI-based real-time asset prognostics and health management,virtual-based intelligent infrastructure monitoring,deep learning-aided continuous improvement of the FM systems,semantically rich data interoperability throughout the facility lifecycle,and autonomous control feedback,need to be further *** review contributes to the body of knowledge on digital transformation and smart FM by identifying the landscape,state-of-the-art research trends,and future needs with regard to DT in FM.

关键词： digital twin building information modeling facility management semantic interoperability artificial intelligence intelligent monitoring autonomous control feedback

design and implementation of somatosensory interactive game based on Leap Motion

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维普期刊数据库

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Computer Aided Drafting,design and Manufacturing 2016年第4期26卷 37-40页

作者： Lu Ming Tan Xin Zhao Dongfeng Gansu Readers Animation Technology Co. Ltd. School of digital media & design Arts Beijing University of Posts and Telecommunications Mobile media and Cultural Calculation Key Laboratory of Beijing Century SchoolBeijing University of Posts and Telecommunications

Recently, virtual reality and interactive somatosensory technology has become one of the hot issues in the research of computer applications. Leap Motion is a new type of interactive somatosensory devices which bring users senses of immersion efficiently. This paper studies a interactive somatosensory game model based on Leap Motion and implemented with Unity. Based on the two core technology philosophy of Leap Motion, i.e., virtual reality technology and body sense of interactive technology, the design implementation of each sub module of the system and Leap Motion game algorithm are thoroughly addressed. This paper has certain significance for future application of Leap Motion in film, television, and interactive games.

关键词： virtual reality technology unity3D game engine Leap Motion UI design

Spatial distribution characteristics and influence factor analysis of landslides——case study of the Hanwang area in Qinba Mountains

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Earthquake Research Advances 2024年第3期4卷 55-65页

作者： Jikai Zhang Yanbo Cao Wen Fan Wenbo Zheng Zequan Wang Chengcheng He Hongquan Teng School of Geological Engineering and Geomatics Chang’an UniversityXi'an710054China Mine Geological Disasters Mechanism and Prevention Key Laboratory Xi'an710054China China DK Comprehensive Investigate and design Research Institute Co. Ltd.Xi'an710054China Shaanxi Engineering Technology Research Center for Urban Geology and Underground Space Xi'an710068China Shaanxi Hydrogeology Engineering Geology and Environment Geology Survey CenterXi'an710068China Chang'an University Xi'anShaanxiChina

The geological hazards of landslides in Hanwang Town, Ziyang County, Ankang City, Shaanxi Province, have emerged. Yet, the current understanding of the spatial distribution characteristics and influencing factors of landslides in this area remains unclear. Combining the results of remote sensing interpretation and field investigation, seven influencing factors, namely, elevation, slope direction, slope gradient, distance from rivers, distance from faults, engineering geologic lithology, and distance from roads, are selected for the study. The distribution characteristics of landslides in each influencing factor and the influence of the resolution of the digital Elevation Model(DEM) on the results are statistically and analytically analyzed. Furthermore, two highrisk landslides within the study area were subjected to comprehensive analysis, integrating the findings from drilling and other field investigations in order to examine their deformation mechanisms. Based on this analysis,the following conclusions were derived:(1) 34 landslides in the study area, mainly small earth landslides, with a distribution density of 0.42/km~2, threatening 414 people and property of about 55.87 million Yuan.(2)The landslides in the study area easily occur in the <400 m elevation range;the landslides are developed in all slope directions, the gradient is mainly concentrated in the range of 10°–40°, the distribution density of the landslides is higher in the closer distance from the river and the faults(0–200 m), the landslide-prone strata are mainly the softer and weaker metamorphic rocks, and the landslides are mainly around roads.(3) The resolution of the DEM should be selected based on the specific conditions of the study area, the requirements of the investigation, and the scale of the landslide. Opting for an appropriate DEM resolution is advantageous for understanding the patterns of landslides and conducting risk assessments in the region.(4) The Zhengjiabian landslide is a trac

关键词： Landslide Spatial distribution Influence factor Landslide density Deformation mechanism DEM

Survey on digital twins for Internet of Vehicles:Fundamentals,challenges,and opportunities

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digital Communications and Networks 2024年第2期10卷 237-247页

作者： Jiajie Guo Muhammad Bilal Yuying Qiu Cheng Qian Xiaolong Xu Kim-Kwang Raymond Choo School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044China department of Computer Engineering Hankuk University of Foreign StudiesGyeonggi-do17035South Korea Jiangsu Hydraulic Research Institute Nanjing210044China department of Information Systems and Cyber Security University of Texas at San AntonioSan AntonioTX78249-0631USA

As autonomous vehicles and the other supporting infrastructures(e.g.,smart cities and intelligent transportation systems)become more commonplace,the Internet of Vehicles(IoV)is getting increasingly *** have been attempts to utilize digital Twins(DTs)to facilitate the design,evaluation,and deployment of IoV-based systems,for example by supporting high-fidelity modeling,real-time monitoring,and advanced predictive ***,the literature review undertaken in this paper suggests that integrating DTs into IoV-based system design and deployment remains an understudied *** addition,this paper explains how DTs can benefit IoV system designers and implementers,as well as describes several challenges and opportunities for future researchers.

关键词： Internet of vehicles digital twin Simulation Traffic systems