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Acoustic localization with multi-layer isogradient sound speed profile using TDOA and FDOA Research Article

Dongzhou ZHAN, Sitian WANG, Shougui CAI, Huarong ZHENG, Wen XU,wxu@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 1,   Pages 164-175 doi: 10.1631/FITEE.2100398

Abstract: In the underwater medium, the speed of sound varies with water depth, temperature, and salinity. The inhomogeneity of water leads to bending of sound rays, making the existing localization algorithms based on straight-line propagation less precise. To realize high-precision node positioning in s (UASNs), a multi-layer isogradient (SSP) model is developed using the linear segmentation approximation approach. Then, the sound ray tracking problem is converted into a polynomial root-searching problem. Based on the derived gradient of the signal's Doppler shift at the sensor node, a novel underwater node localization algorithm is proposed using both the and . Simulations are implemented to illustrate the effectiveness of the proposed algorithm. Compared with the traditional straight-line propagation method, the proposed algorithm can effectively handle the sound ray bending phenomenon. Estimation accuracy with different SSP modeling errors is also investigated. Overall, accurate and reliable node localization can be achieved.

Keywords： Underwater acoustic sensor network     Acoustic localization     Sound speed profile     Time difference of arrival(TDOA)     Frequency difference of arrival (FDOA)    

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A performance analysis of multi-satellite joint geolocation Article

Ding WANG,Shuai WEI,Ying WU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 12,   Pages 1360-1387 doi: 10.1631/FITEE.1500285

Abstract: We systematically analyze the performance of multi-satellite joint geolocation based on time differenceof arrival (TDOA) measurements.In scenario 1, only the TDOA measurement errors of the emitting source are considered and the satelliteIn scenario 2, both the TDOA measurement errors and satellite position uncertainties are taken into account

Keywords： Satellite geolocation     Time difference of arrival (TDOA)     Cramer-Rao bound (CRB)     Calibration sources    

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The Regularity of Time of Arrival in 90° Bend Tunnel for Shock Wave due to Explosions From High Explosive

Shen Jun,Li Yongchi,Pang Weibin

Strategic Study of CAE 2006, Volume 8, Issue 3,   Pages 53-57

Abstract: Through collecting data gained from 4 experiments, a formula was proposed which can compute time of arrival

Keywords： internal explosion     shock wave     time of arrival    

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Structural total least squares algorithm for locating multiple disjoint sources based on AOA/TOA/FOA in the presence of system error None

Xin CHEN, Ding WANG, Rui-rui LIU, Jie-xin YIN, Ying WU

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 7,   Pages 917-936 doi: 10.1631/FITEE.1700735

Abstract: Single-station passive localization technology avoids the complex time synchronization and informationAccording to the available measurements including the angle-of-arrival (AOA), time-of-arrival (TOA),and frequency-of-arrival (FOA), the corresponding pseudo linear equations are deduced.

Keywords： Single-station     Structural total least squares     Inverse iteration     Angle-of-arrival (AOA)     Time-of-arrival(TOA)     Frequency-of-arrival (FOA)     Disjoint sources    

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Land use/cover change effects on floods with different return periods: a case study of Beijing, China

Yueling WANG, Xiaoliu YANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 5,   Pages 769-776 doi: 10.1007/s11783-013-0542-z

Abstract: statistical methods was applied to quantify the effect of LUCC on floods in terms of inundation extent, flood arrivaltime and maximum water depth.of analysis Beijing experienced unprecedented LUCC; 2) LUCC can affect inundation extent and flood arrivaltime, and floods with longer return periods are more influenced; 3) LUCC can affect maximum water depth

Keywords： inundation extent     flood arrival time     maximum water depth     shallow flow model    

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Passive source localization using importance sampling based on TOA and FOA measurements Article

Rui-rui LIU, Yun-long WANG, Jie-xin YIN, Ding WANG, Ying WU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 8,   Pages 1167-1179 doi: 10.1631/FITEE.1601657

Abstract: estimator can achieve a high accuracy but involves high calculation burdens, especially when based on time-of-arrivaland frequency-of-arrival measurements for its internal nonlinearity and nonconvex nature.

Keywords： Passive source localization     Time of arrival (TOA)     Frequency of arrival (FOA)     Monte Carlo importance    

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Modeling and Real-time Performance Analysis of Switched Ethernet by Network Calculus

Wang Xiaoxin,Liu Luyuan,Liu Jing,Ma Jinjue

Strategic Study of CAE 2006, Volume 8, Issue 6,   Pages 55-59

Abstract:

The real-time performance of switched Ethernet is a hot research field.switch, a switch model by network calculus is proposed, in which the data flow is divided into real-timeflow and non-real-time flow and the arrival curve, service curve, the max delay and max storage neededThe max delay provides theory direction for transmitting real-time data in switched Ethernet and themax storage provides the theory reference for constructing switch in real-time industrial Ethernet.

Keywords： network calculus     switch     arrival curve     service curve     delay    

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Temperature difference-powered carbon nanotube bearings

Quanwen HOU, Bingyang CAO, Zengyuan GUO

Frontiers in Energy 2011, Volume 5, Issue 1,   Pages 49-52 doi: 10.1007/s11708-010-0111-0

Abstract: simulations are conducted to study the motion of carbon nanotube-based nanobearings powered by temperature differenceWhen a temperature difference exists between stator nanotubes, the rotor nanotubes acquire a higher temperatureThe thermal driving force increases with the increase in temperature difference between the stators,an increase that is nearly proportional to the temperature difference.

Keywords： temperature difference-induced motion     carbon nanotubes     nanobearing     molecular dynamics simulation    

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Analogue Difference Balanced Function and Its Applications

Zhang Wenying,Li Shiqu

Strategic Study of CAE 2004, Volume 6, Issue 3,   Pages 45-52

Abstract:

This paper presents the concept of analogous difference of Boolean function, and call the Booleanfunction an analogue difference balanced function if whose analogous difference is balanced at any nonzero

Keywords： Bent function     perfect nonlinear function     2-radical expansion     analogue difference     analogue auto-correlationfunction     analogue difference balanced function    

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Synthesis of Intermittent-Motion Linkages with Slight Difference in Length Between Links

CHEN Xin-bo, YU Zhen

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1,   Pages 76-79 doi: 10.1007/s11465-005-0007-6

Abstract: In this paper, (1) a new method for realizing intermittent motion, using linkages with a slight difference

Keywords： synthesis     useful     intermittent     intermittent-motion     traditional    

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Comprehensive Utilization of Temperature Difference Energy and Low-Temperature Seawater Resources

Fu Qiang, Wang Guorong, Zhou Shouwei, Zhong Lin, Zhang Li, Yu Xingyong, Yang Pu

Strategic Study of CAE 2021, Volume 23, Issue 6,   Pages 52-60 doi: 10.15302/J-SSCAE-2021.06.007

Abstract:

China has a huge amount of ocean temperature difference energy resourcesseawater to generate electricity; this can help overcome the difficulties regarding the temperature differencetechnical references and application demonstrations for the comprehensive utilization of temperature difference

Keywords： ocean temperature difference energy     low-temperature seawater resources     liquefied natural gas cold energy     comprehensive utilization     temperature difference power generation    

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The Difference Effect of Environmental Regulation on Two Stages of Technology Innovation in China’s Manufacturing

Bao-long Yuan,Sheng-gang Ren,Xing Hu,Xuan-yu Yang

Frontiers of Engineering Management 2016, Volume 3, Issue 1,   Pages 24-29 doi: 10.15302/J-FEM-2016007

Abstract: This paper divides technological innovation into two stages: technology development and technology transfer. Then the authors use the panel data of 28 manufacturing industries during 2003–2012 to test the econometric regression model for the industry of the sub stages, which is a regulation on technological innovation in the environment. The results show that: (1) environmental regulation has a significant role in promoting China’s manufacturing technology research patent achievements, and technology into new products, and this indicated that “Porter hypothesis” in the manufacturing sector has been verified; (2) R&D and transfer expenditure have a positive impact on technological innovation. Finally, the authors put forward the corresponding policy recommendations for industry of the environmental regulation on the impact of technological innovation in phases.

Keywords： environmental regulation     technology innovation     stage difference     manufacturing    

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Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault

Masoud RANJBARNIA, Milad ZAHERI, Daniel DIAS

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 998-1011 doi: 10.1007/s11709-020-0621-8

Abstract: normal fault movement on a transversely crossing shallow shotcreted tunnel are investigated by 3D finite difference

Keywords： urban tunnel     sprayed concrete     reverse fault     normal fault     finite difference analysis    

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A two-echelon （S-1，S） inventory model for repairable items based on markovian arrival process

Chen Tong,Li Fang and Di Peng

Strategic Study of CAE 2015, Volume 17, Issue 5,   Pages 113-119

Abstract: repairable items and single repair facility， and assumes that the item demand occur according to a markovian arrivalprocess （MAP）， the repair time， ship time and procurement time follow the general distribution which

Keywords： （S-1，S） policy；two-echelon inventory；repairable item；markovian arrival process    

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Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 440-447 doi: 10.1007/s11705-017-1626-2

Abstract: Isothermal-isobaric molecular dynamics simulation was used to study the diffusion mechanism of water in polyurethane- -poly( -isopropyl acrylamide) (PU- -PNIPAm) with a hydrophobic PU/hydrophilic PNIPAm mass ratio of 1.4 to 1 at 298 K and 450 K. Here, the experimental glass transition temperature ( ) of PU is 243 K while that of PNIPAm is 383 K. Different amounts of water up to 15 wt-% were added to PU- -PNIPAm. We were able to reproduce the specific volumes and glass transition temperatures (250 K and 390 K) of PU- -PNIPAm. The computed self-diffusion coefficient of water increased exponentially with increasing water concentration at both temperatures (i.e., following the free volume model of Fujita). It suggested that water diffusion in PU- -PNIPAm depends only on its fractional free volume despite the free volume inhomogeneity. It is noted that at 298 K, PU is rubbery while PNIPAm is glassy. Regardless of temperature, radial distribution functions showed that water formed clusters with sizes in the range of 0.2–0.4 nm in PU- -PNIPAm. At low water concentrations, more clusters were found in the PU domain but at high water concentrations, more in the PNIPAm domain. It is believed that water molecules diffuse as clusters rather than as individual molecules.

Keywords： molecular dynamics simulation     amphiphilic block copolymer     free volume     water diffusivity     fujita model    

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Title Author Date Type Operation

Acoustic localization with multi-layer isogradient sound speed profile using TDOA and FDOA

Dongzhou ZHAN, Sitian WANG, Shougui CAI, Huarong ZHENG, Wen XU,wxu@zju.edu.cn

Journal Article

A performance analysis of multi-satellite joint geolocation

Ding WANG,Shuai WEI,Ying WU

Journal Article

The Regularity of Time of Arrival in 90° Bend Tunnel for Shock Wave due to Explosions From High Explosive

Shen Jun,Li Yongchi,Pang Weibin

Journal Article

Structural total least squares algorithm for locating multiple disjoint sources based on AOA/TOA/FOA in the presence of system error

Xin CHEN, Ding WANG, Rui-rui LIU, Jie-xin YIN, Ying WU

Journal Article

Land use/cover change effects on floods with different return periods: a case study of Beijing, China

Yueling WANG, Xiaoliu YANG

Journal Article

Passive source localization using importance sampling based on TOA and FOA measurements

Rui-rui LIU, Yun-long WANG, Jie-xin YIN, Ding WANG, Ying WU

Journal Article

Modeling and Real-time Performance Analysis of Switched Ethernet by Network Calculus

Wang Xiaoxin,Liu Luyuan,Liu Jing,Ma Jinjue

Journal Article

Temperature difference-powered carbon nanotube bearings

Quanwen HOU, Bingyang CAO, Zengyuan GUO

Journal Article

Analogue Difference Balanced Function and Its Applications

Zhang Wenying,Li Shiqu

Journal Article

Synthesis of Intermittent-Motion Linkages with Slight Difference in Length Between Links

CHEN Xin-bo, YU Zhen

Journal Article

Comprehensive Utilization of Temperature Difference Energy and Low-Temperature Seawater Resources

Fu Qiang, Wang Guorong, Zhou Shouwei, Zhong Lin, Zhang Li, Yu Xingyong, Yang Pu

Journal Article

The Difference Effect of Environmental Regulation on Two Stages of Technology Innovation in China’s Manufacturing

Bao-long Yuan,Sheng-gang Ren,Xing Hu,Xuan-yu Yang

Journal Article

Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault

Masoud RANJBARNIA, Milad ZAHERI, Daniel DIAS

Journal Article

A two-echelon （S-1，S） inventory model for repairable items based on markovian arrival process

Chen Tong,Li Fang and Di Peng

Journal Article

Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Journal Article