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bandwidth optimization of MEMS Accelerometers in Fluid Medium Environment

SENSORS 2022年第24期22卷 9855-9855页

作者： Xu, Xiang Wu, Shuang Fang, Weidong Yu, Zhe Jia, Zeyu Wang, Xiaoxu Bai, Jian Lu, Qianbo Northwestern Polytech Univ Ningbo Inst Northwestern Polytech Univ Inst Flexible Elect IFE Frontiers Sci Ctr Flexible Elect FSCFEMIIT Key La Xian 710072 Peoples R China Zhejiang Univ State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China Northwestern Polytech Univ Sch Automat Key Lab Informat Fus Technol Minist Educ 127 West Youyi Rd Xian 710072 Peoples R China

There is a constraint between the dynamic range and the bandwidth of MEMS accelerometers. When the input acceleration is comparatively large, the squeeze film damping will increase dramatically with the increase in the oscillation amplitude, resulting in a decrease in bandwidth. Conventional models still lack a complete vibration response analysis in large amplitude ratios and cannot offer a suitable guide in the optimization of such devices. In this paper, the vibration response analysis of the sensing unit of an accelerometer in large amplitude ratios is first completed. Then, the optimal design of the sensing unit is proposed to solve the contradiction between the dynamic range and the bandwidth of the accelerometer. Finally, the results of the vibration experiment prove that the maximum bandwidth can be achieved with 0 similar to 10g external acceleration, which shows the effectiveness of the design guide. The new vibration analysis with the complete model of squeeze film damping is applicable to all sensitive structures based on vibration, not limited to the MEMS accelerometer studied in this thesis. The bandwidth optimal scheme also provides a strong reference for similar structures with large oscillation amplitude ratios.

关键词： bandwidth optimization MEMS accelerometer squeeze film damping amplitude effect

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Computational Framework for Node Placement and bandwidth optimization in Dynamic Fog Computing Environments 19

Computational Framework for Node Placement and Bandwidth Opt...

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19th IEEE-India-Council International Conference (INDICON)

作者： Sheela, S. Chouhan, Dharamendra Kumar, S. M. Dilip Univ Visvesvaraya Coll Engn UVCE Dept Comp Sci & Engn Bengaluru 560001 India

ISBN: (纸本)9781665473507

With the increasing demand of optimal performance for applications hosted over cloud environment, fog computing offers an additional layer of benefits by finding the best position for placing the fog nodes to carry out computational processing of data. However, there are challenges associated with this process of fog node placement. Existing review of literature shows that there are open-end problems associated with available approaches with respect to computational efficiency. Hence, this paper proposes a computational framework for fog node placement and resource allocation using potential features of Reinforcement Learning (RL) emphasizing towards bandwidth optimization. The framework is scripted on Python environment, and the proposed scheme uses Q-Learning for performing predictive operation. Markov modelling is carried out towards framing up the model. The outcome of this proposed work shows better dynamic placement of fog nodes for optimal clustering and bandwidth efficiency on its simulation environment.

关键词： bandwidth optimization Cloud Computing Fog Computing Resource Allocation Reinforcement Learning Node Placement Q-Learning

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Ultra-Thin Metasurface-Based Absorber of Low-Frequency Sound With bandwidth optimization

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FRONTIERS IN MATERIALS 2021年 8卷

作者： Guan, Yi-jun Ge, Yong Sun, Hong-xiang Yuan, Shou-qi Lai, Yun Liu, Xiao-jun Jiangsu Univ Res Ctr Fluid Machinery Engn & Technol Sch Phys & Elect Engn Zhenjiang Jiangsu Peoples R China Nanjing Univ Key Lab Modern Acoust Natl Lab Solid State Microstruct Dept Phys Nanjing Peoples R China Nanjing Univ Collaborat Innovat Ctr Adv Microstruct Nanjing Peoples R China Chinese Acad Sci Inst Acoust State Key Lab Acoust Beijing Peoples R China

We report, both theoretically and experimentally, a type of ultra-thin metasurface-based low-frequency sound absorber with bandwidth optimization. Such a metasurface unit consists of an ultrathin resonator (thickness similar to 1/90 wavelength) with a circular hole on the upper panel and four narrow slits inside a multiple-cavity structure. Eigenmode simulations of the unit show rich artificial Mie resonances, in which a type of monopolar Mie resonance mode can be obtained at 238.4 Hz. Based on the excitation of the monopolar mode, we can realize the near-perfect low-frequency sound absorption with the maximum absorption coefficient and fractional bandwidth of 0.97 and 12.9%, respectively, which mainly arises from the high thermal-viscous loss around the circular hole and four narrow slits of the unit. More interestingly, by combining 4 units with different diameters of the circular hole, we further enhance the fractional bandwidth of the compound unit to 18.7%. Our work provides a route to design ultra-thin broadband sound absorbers by artificial Mie resonances, showing great potential in practical applications of low-frequency noise control and architectural acoustics.

关键词： acoustics absorber low-frequency sound metasurface bandwidth optimization

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Software-defined dynamic bandwidth optimization (SD-DBO) algorithm for optical access and aggregation networks

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PHOTONIC NETWORK COMMUNICATIONS 2016年第2期31卷 251-258页

作者： Zhao, Yongli Yan, Boyuan Wu, Jialin Zhang, Jie Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

The optical access networks and aggregation networks are necessary to be controlled together to improve the bandwidth resource availability globally. Unified control architecture for optical access networks and aggregation networks is designed based on software-defined networking controller, the function modules of which have been described and the related extended protocol solution has been given. A software-defined dynamic bandwidth optimization (SD-DBO) algorithm is first proposed for optical access and aggregation networks, which can support unified optimizations and efficient scheduling by allocating bandwidth resources from a global network view in real time. The performance of the proposed algorithm has been verified and compared with traditional DBA algorithm in terms of resource utilization rate and average delay time. Simulation result shows that SD-DBO algorithm performs better.

关键词： Software-defined network Optical access network bandwidth optimization

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Tracking Loops Design and bandwidth optimization for SINS-aided GPS Receiver

Tracking Loops Design and Bandwidth optimization for SINS-ai...

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IEEE International Conference on Information and Automation (ICIA)

作者： Ma, Long-Hua Huang, Shao-Hui Xu, Ming Zhao, Ji-Zhuang Zhejiang Univ Ningbo Inst Technol Ningbo 315100 Zhejiang Peoples R China Zhejiang Univ Coll Control Sci & Engn Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)9781509041022

With The structural design of the INS-aided (Inertial Navigation System-aided) receiver tracking loops is the main part of implementing an SINS(Strapdown Inertial Navigation System)/GPS Ultra-Tightly Coupled Integrated Navigation System, and the loop bandwidth is the key factor to determine the performance of the tracking loop. Considering satellite signals are easy to be out of locking in high dynamic environment, the INS Velocity Information receiver tracking loops to increase the effective bandwidth of tracking loop is designed in this paper. The Simulation results show that inter-restricted relationship between the thermal agitation noise error and the dynamic stress error in the carrier tracking loop.

关键词： GPS SINS Ultra-Tight Integration INS-aided Tracking loops bandwidth optimization

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Neural Network optimization of Multivariate KDE bandwidth for Buoy Spatial Information

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Journal of Shanghai Jiaotong university(Science) 2024年第5期29卷 773-779页

作者： XU Liangkun XUE Han JIN Yongxing ZHOU Shibo Merchant Marine College Shanghai Maritime UniversityShanghai201306China College of Navigation Jimei UniversityXiamen361021FujianChina

It is one of the responsibilities of the navigation support department to ensure the correct layout position of the light buoy and provide as accurate position information as possible for ship navigation and *** the position deviation of the light buoy is too large to be detected in time,sending wrong navigation assistance information to the ship will directly affect the navigation safety of the ship and increase the pressure on the management ***,mastering the offset characteristics of light buoy is of great significance for the maintenance of light buoy and improving the navigation aid efficiency of light *** density estimation can intuitively express the spatial and temporal distribution characteristics of buoy position,and indicates the intensive areas of buoy position in the *** this paper,in order to speed up deciding the optimal variable width of kernel density estimator,an improved adaptive variable width kernel density estimator is proposed,which reduces the risk of too smooth probability density estimation phenomenon and improves the estimation accuracy of probability density.A fractional recurrent neural network is designed to search the optimal bandwidth of kernel density *** not only achieves faster training speed,but also improves the estimation accuracy of probability density.

关键词： kernel density estimation buoy bandwidth optimization recurrent neural network navigation aid efficiency spatial information

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bandwidth optimization for Real-Time Online and Mobile Applications

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World Conference on Information Systems and Technologies (WorldCIST)

作者： Mansour, Ahmed Mokhtar A. Fouad, Mona A. M. Nile Innovat Free Lancing Cairo Egypt Natl Telecommun Inst Cairo Egypt

ISBN: (纸本)9783319059488;9783319059471

This work proposes a novel algorithm to maximize the utilization of bandwidth for any text based application. The algorithm is used for real-time online text chatting, as well as offline SMS in mobile phones. Text is handled transparently without any modification in the core network. The proposed algorithm is an application of 'A-M' compression framework. Applying such algorithm will save at least 25% and up to 90% of the bandwidth depending on the context of the transferred data. Other applications such as email, web browsing, etc... will also gain from applying such algorithm. This paper demonstrated two types of applications;the real-time text chatting, and the mobile SMS application. The algorithm depends on a pre-defined dictionary of maximum size of 16 Kbyte installed on the client side or on the cloud near each client.

关键词： bandwidth optimization mobile application real-time application network QoS transparent compression

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GLOBAL DYNAMIC bandwidth optimization FOR SOFTWARE DEFINED OPTICAL ACCESS AND AGGREGATION NETWORKS 13

GLOBAL DYNAMIC BANDWIDTH OPTIMIZATION FOR SOFTWARE DEFINED O...

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13th International Conference on Optical Communications and Networks (IEEE ICOCN)

作者： Wu, Jialin Zhao, Yongli Zhang, Jie Zhou, Junwen Sun, Ji Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing Peoples R China

ISBN: (纸本)9781479972197

We propose a global dynamic bandwidth optimization algorithm for software defined optical access and aggregation networks, which can support unified optimizations and efficient scheduling by allocating bandwidth resources from a global network view in real-time. The performance benefits of the proposed algorithm in terms of resource utilization rate, average delay and delay of a single mobile user are verified through network simulation.

关键词： Software-defined Network Optical Access Network bandwidth optimization

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Gain and bandwidth optimization of a Novel Microstrip Patch Antenna 4

Gain and Bandwidth Optimization of a Novel Microstrip Patch ...

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4th International Conference on Advances in Computing and Communications (ICACC)

作者： Chandran, Parvathy P. Viswasom, Sanoj Coll Engn Dept Elect & Commun Thiruvananthapuram Kerala India

ISBN: (纸本)9781479943630

A new slotted microstrip patch antenna with improved bandwidth and gain is proposed. As a method to enhance bandwidth two types of slots, namely a rectangular and a fractal U shaped, are imposed on the patch surface. By cutting a cylindrical slot on the ground plane gain is also improved. Genetic algorithm optimization is used as a means for optimizing gain and bandwidth of the patch antenna. The work is carried for a frequency of 1.6 GHz. High frequency structure simulation (HFSS) Software has been used to simulate and find the optimum design and results. A gain improvement of almost 18.6% and a bandwidth enhancement of about 100% has obtained.

关键词： Microstrip patch antenna Inset feed bandwidth optimization Gain optimization Genetic algorithm optimization

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Surrogate-Model-Aided optimization of the bandwidth for a Planar UWB Inverted-F Antenna 13

Surrogate-Model-Aided Optimization of the Bandwidth for a Pl...

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13th International Conference on Microwave and Millimeter Wave Technology (ICMMT)

作者： Du, Jinxin Roblin, Christophe Yang, Xue-Xia Shanghai Univ Sch Commun & Informat Engn Shanghai 200444 Peoples R China Shanghai Univ Sino European Engn Sch UTSEUS Shanghai 200444 Peoples R China Telecom Paris Dept Commun & Elect F-91120 Palaiseau France Inst Polytech Paris IPP F-91120 Palaiseau France Shanghai Univ Shanghai Inst Adv Commun & Data Sci Key Lab Specialty Fiber Opt & Opt Access Networks Shanghai 200444 Peoples R China

ISBN: (纸本)9781728157337

A new efficient methodology to speed up the optimization of the bandwidth of antenna designs is proposed in this paper. First, the reflection coefficient S-11(f) of the considered antenna is compactly represented by Fourier series. Second, the coefficients of the Fourier series are modeled by using the Least-Angle-Regression-Sampling-based Polynomial Chaos Expansion (LARS-PCE). Lastly, the derived surrogate model serves as an extremely efficient "engine" which can substitute the time-consuming full-wave simulators for the optima seeking. The proposed methodology has been validated on a planar Ultra-Wideband (UWB) Inverted-F Antenna (IFA), whose impedance bandwidth has been increased by more than 18 % compared to the original design and the computational cost is limited.

关键词： bandwidth optimization surrogate model polynomial chaos UWB IFA

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