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IEEE Conference on Vehicular Technology (VTC)

作者： Byung-Chul Kim I-Tai Lu System Architecture Design Lab TN Business Samsung Electronics Company Limited Suwon Gyeonggi South Korea Department of Electrical and Computer Engineering Polytechnic University Melville NY USA

Novel space-time-frequency processing schemes for OFDM mobile communication systems are implemented using antenna arrays, tap delay lines and Doppler branches to exploit angular spread, delay spread and Doppler spread... 详细信息

ISBN: (纸本)0780377575

关键词： OFDM Wireless communication Mobile communication Fading Delay effects Antenna arrays Sampling methods Degradation Bit error rate Aperture antennas

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Vibration-modal analysis model for multi-span pipeline with different support conditions

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Computer Modelling and New Technologies 2014年第5期18卷 7-13页

作者： Liu, Jun He, Xing Liu, Qingyou Naibin, Jiang Chen, Huang School of Civil Engineering and Architecture Southwest Petroleum University Chengdu China Modern Design and Simulation Lab for Oil and Gas Equipment's Southwest Petroleum University Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

Vibration characteristics analysis is important in the design of multi-span pipeline with different support conditions. In order to analyze the natural frequency and the vibration modal of the multi-span pipeline, a matrix transfer method is proposed in this paper. With the multi-span pipeline divided into single-span pipes, the transmission formulas for the deflection, angle, bending and shear between two adjacent spans are deduced, in combination with the Krylov function solution of the free vibration equation for the single-span pipe, and the constraint condition between the two adjacent spans of the multi-span pipeline. According to the boundary conditions on the starting and ending spans, the natural frequency equation and the vibration modal function between two adjacent spans of the multi-span pipeline are presented. The FORTRAN program based on the above principle is written, and the natural vibration frequencies and the vibration modals of two typical multi-span pipelines are investigated and compared with the results from ABAQUS. It is shown that the model presented in this paper is efficient in the analysis of multi-span pipeline and has the advantages of high computational efficiency and convenience for engineering practice application.

关键词： Natural frequencies

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Hierarchically characterizing CUDA program behavior

Hierarchically characterizing CUDA program behavior

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IEEE International Workshop/Symposium on Workload Characterization

作者： Zhibin Yu Hai Jin Nilanjan Goswami Tao Li Lizy K. John Service Computing Technologies and System Lab/Cluster and Grid Computing Lab Huazhong University of Science and Technology Wuhan China Intelligent Design of Efficient Architecture Lab University of Florida Gainesville FL USA Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

CUDA has become a very popular programming paradigm in parallel computing area. However, very little work has been done for characterizing CUDA kernels. In this work, we measure the thread level performance, collect the basic block level characteristics, and glean the instruction level properties for about 35 programs from CUDA SDK, Parboil, and Rodinia benchmark suites. In addition, we define basic block vectors, synchronization vectors and thread similarity matrix to capture the characteristics of CUDA programs efficiently. We find that CUDA programs have some unique characteristics at each level compared to sequential programs.

关键词： Graphics processing unit Vectors Kernel Instruction sets Programming USA Councils Educational institutions

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MGSO: Monocular Real-time Photometric SLAM with Efficient 3D Gaussian Splatting

arXiv

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arXiv 2024年

作者： Hu, Yan Song Abboud, Nicolas Ali, Muhammad Qasim Yang, Adam Srebrnjak Elhajj, Imad Asmar, Daniel Chen, Yuhao Zelek, John S. Vision and Image Processing Lab The Faculty of System Design Engineering The University of Waterloo 200 University Avenue West WaterlooON Canada Vision and Robotics Lab Maroun Semaan Faculty of Engineering and Architecture American University of Beirut Riad El Solh Beirut1107 2020 Lebanon

Real-time SLAM with dense 3D mapping is computationally challenging, especially on resource-limited devices. The recent development of 3D Gaussian Splatting (3DGS) offers a promising approach for real-time dense 3D reconstruction. However, existing 3DGS-based SLAM systems struggle to balance hardware simplicity, speed, and map quality. Most systems excel in one or two of the aforementioned aspects but rarely achieve all. A key issue is the difficulty of initializing 3D Gaussians while concurrently conducting SLAM. To address these challenges, we present Monocular GSO (MGSO), a novel real-time SLAM system that integrates photometric SLAM with 3DGS. Photometric SLAM provides dense structured point clouds for 3DGS initialization, accelerating optimization and producing more efficient maps with fewer Gaussians. As a result, experiments show that our system generates reconstructions with a balance of quality, memory efficiency, and speed that outperforms the state-of-the-art. Furthermore, our system achieves all results using RGB inputs. We evaluate the Replica, TUM-RGBD, and EuRoC datasets against current live dense reconstruction systems. Not only do we surpass contemporary systems, but experiments also show that we maintain our performance on laptop hardware, making it a practical solution for robotics, A/R, and other real-time applications. © 2024, CC BY-NC-SA.

关键词： SLAM robotics

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Inline Photometrically Calibrated Hybrid Visual SLAM

arXiv

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arXiv 2024年

作者： Abboud, Nicolas Sayour, Malak Elhajj, Imad H. Zelek, John Asmar, Daniel Vision and Robotics Lab Maroun Semaan Faculty of Engineering and Architecture American University of Beirut Riad El Solh Beirut1107 2020 Lebanon Department of System Design Engineering University of Waterloo 200 University Avenue West WaterlooON Canada

This paper presents an integrated approach to Visual SLAM, merging online sequential photometric calibration within a Hybrid direct-indirect visual SLAM (H-SLAM). Photometric calibration helps normalize pixel intensity values under different lighting conditions, and thereby improves the direct component of our H-SLAM. A tangential benefit also results to the indirect component of H-SLAM given that the detected features are more stable across variable lighting conditions. Our proposed photometrically calibrated H-SLAM is tested on several datasets, including the TUM monoVO as well as on a dataset we created. Calibrated H-SLAM outperforms other state of the art direct, indirect, and hybrid Visual SLAM systems in all the experiments. Furthermore, in online SLAM tested at our site, it also significantly outperformed the other SLAM systems. © 2024, CC BY-NC-ND.

关键词： Lighting

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A reconfigurable routing method for fault-tolerant mesh-based network on chip

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Journal of Information and Computational Science 2013年第1期10卷 157-165页

作者： Liu, Yanhua Ruan, Ying Lai, Zongsheng Sun, Ling Institute of Microelectronics Circuit and System East China Normal University Shanghai 200241 China Jiangsu Provincial Key Lab. of ASIC Design Nantong University Nantong 226019 China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

As the semiconductor industry advances to nano-technology points, Network on Chip (NoC) components are becoming vulnerable to errors during the system operation. Consequently, fault-tolerant techniques for NoC are needed to achieve high reliability. In this paper, we present a fault-tolerant routing method to tolerate faulty routers in a two-dimension (2D) mesh-based NoC. With this method, the system can have a multi-router fault-tolerant capability and the routing path can be dynamically reconfigured to support different situations caused by faulty routers in NoC. Fault-tolerance capability and system performance of the proposed method are evaluated through analysis and simulations. Theoretical analysis and simulation results show that the proposed method can enhance the reliability of system and offer considerable fault-tolerance capability. © 2013 by Binary Information Press.

关键词： Network-on-chip

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Automated simulation for household road traffic noise exposure: Application and field evaluation in a high-density city

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Computers, Environment and Urban systems 2023年第1期104卷

作者： Guo, Mengdi Ni, Michael Y. Shyu, Rong-Juin Ji, John S. Huang, Jianxiang Department of Architecture School of Architecture Tianjin University Tianjin China Department of Urban Planning and Design the University of Hong Kong Hong Kong Special Administrative Region China The University of Hong Kong Shenzhen Institute of Research and Innovation 5/F Key Laboratory Platform Building Shenzhen Virtual University Park No.6 Yuexing 2nd Rd Nanshan Shenzhen518057 China School of Public Health LKS Faculty of Medicine The University of Hong Kong Hong Kong Special Administrative Region China The State Key Laboratory of Brain and Cognitive Sciences The University of Hong Kong Hong Kong Special Administrative Region China Urban Systems Institute the University of Hong Kong Hong Kong Special Administrative Region Hong Kong Department of System Engineering and Naval Architecture National Taiwan Ocean University Keelung Taiwan Vanke School of Public Health Tsinghua University Beijing China Sustainable High Density Cities Lab HKUrban Lab Faculty of Architecture the University of Hong Kong Hong Kong Special Administrative Region Hong Kong

Road traffic noise is a major nuisance and a risk factor of poor health for urban dwellers. A household's exposure to road traffic noise, especially in a high-density city, can be easily modified by the surrounding built environment, i.e., roads, traffic, buildings, and the topography. This leads to high variation in noise exposure between neighboring households. Existing simulation-based studies were limited in accounting for the variation of noise exposure at the household level, which restricted their applications in public health research involving large numbers of participants. This paper describes a novel simulation-based workflow to assess household traffic noise exposure, which consists of 1) a source model to assess road traffic noise levels, 2) a propagation model to simulate noise propagation in complex three-dimensional urban areas, 3) an automation algorithm to process large quantity of simulation runs and data. The workflow has been evaluated using field studies conducted in Sham Shui Po District, Hong Kong, with reasonably good agreements between simulated and measured data. It was then used to assess road traffic noise exposure for a sample of 6158 households enrolled in the FAMILY Cohort, representing Hong Kong's population dwelling in the dense urban areas. Results showed that 83% of sampled households have been exposed to excessive road traffic noise above the World Health Organization (WHO) standard, or 30% above the local standard. The estimated burden of disease is over 45,000 disability-adjusted life-years (DALYs) from both high annoyance and sleep disturbance for households in Hong Kong. The study has contributed to the methodologies and datasets in evaluating noise exposure in high-density cities, which can further support urban noise mitigation policies and planning and population-based health studies in the next steps. © 2023 Elsevier Ltd

关键词： Three dimensional computer graphics

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Mapping food system drivers of the double burden of malnutrition using community-based system dynamics: a case study in Peru

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BMC global and public health 2024年第1期2卷 15页

作者： Carmen Quinteros-Reyes Paraskevi Seferidi Laura Guzman-Abello Christopher Millett Antonio Bernabé-Ortiz Ellis Ballard CRONICAS Center of Excellence in Chronic Diseases Universidad Peruana Cayetano Heredia Lima Peru. Public Health Policy Evaluation Unit School of Public Health Imperial College London London UK. paraskevi.seferidi14@imperial.ac.uk. Department of Design School of Architecture and Design Universidad de los Andes Bogota Colombia. Public Health Policy Evaluation Unit School of Public Health Imperial College London London UK. Comprehensive Health Research Center (CHRC) and Public Health Research Centre National School of Public Health NOVA University Lisbon Portugal. Social System Design Lab Brown School at Washington University in St. Louis St. Louis USA.

BACKGROUND:Peru is facing a double burden of malnutrition (DBM), characterized by the co-existence of undernutrition and overnutrition. Double-duty actions that concurrently target common drivers of undernutrition and overnutrition, while ensuring no unintended side effects, are recommended to effectively address the DBM. To understand these complex common mechanisms and design context-specific double-duty actions, there is a need for participatory systems approaches. This paper provides a case study of applying a community-based system dynamics approach to capture stakeholder perspectives of food system drivers of the DBM in two regions in Peru. METHODS:We implemented a multi-stage community-based system dynamics approach, which included processes for research capacity building for systems approaches, and the designing, piloting, and implementation of stakeholder workshops. A total of 36 stakeholders, representing diverse perspectives, participated in five group model building workshops. Stakeholder views are presented in a causal loop diagram that showcases the feedback mechanisms between key food system drivers of overweight and stunting in Peru. RESULTS:The causal loop diagram highlights that prioritization of undernutrition over overnutrition in the policymaking process, due to Peru's historically high levels of undernutrition, may undermine action against the DBM. It also describes potential mechanisms of unintended impacts of undernutrition policies on the DBM in Peru, including impacts related to within-family distribution and quality of food provided through food assistance programs, and unintended impacts due to regional dynamics. CONCLUSIONS:This paper highlights the importance of a participatory approach to understand local needs and priorities when recommending double-duty actions in Peru and shares practical methodological guidance on applying participatory systems approaches in public health.

关键词： Community-based system dynamics Double burden of malnutrition Double-duty actions Food system Group model building Peru

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