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MANUFACTURING TECHNOLOGY 2020年第1期20卷 126-132页

作者： Yao, Na Zhang, Zhaoyun Wang, Zhiping Dongguan Univ Technol Dongguan 523808 Guangdong Peoples R China

This paper proposes a control strategy for single-phase off-grid inverter, which integrates the three closed-loop control with the iterative-based RMS algorithm. The inverter circuit is modeled, and simulation experiment and prototype verification are performed on Matlab. The results show that the voltage drop problem caused by an abrupt variation of inverter load is improved greatly owing to the addition of voltage RMS loop. Meanwhile, the application of iterative method enhances the dynamic response performance of the system substantially;and improves the real-timeliness of three closed-loop control. The two complement each other to provide a highly effective, reliable control solution for the single-phase off-grid inverter.

关键词： heavy load Inverter iterative algorithm three-closed loop control

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Equilibrium of the ride-sourcing market considering labor supply 16

Equilibrium of the ride-sourcing market considering labor su...

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16th International Conference on Service Systems and Service Management (ICSSSM)

作者： Xue, Zhaojie Zeng, Shuhui Shenzhen Univ Coll Civil & Transportat Engn Dept Transportat Engn Shenzhen Peoples R China

ISBN: (纸本)9781728119410

Mobile technology has led to more and more app-based ride-sourcing platforms on the market. This paper analyzes the pricing strategies of ride-sourcing platforms by economic model and numerical experiment. We propose an overall model which includes demand, labor supply, and the matching function between demand and supply. The model explicitly considers the interaction between labor supply and driver income, while modeling the market as a system of nonlinear equations. We prove the existence of market equilibrium through the fixed point theorem, and propose an approximate iterative algorithm to obtain the equilibrium. Finally, we use numerical experiments to study the impact of pricing strategies on the ride-sourcing market.

关键词： ride-sourcing market labor supply iterative algorithm market equilibrium

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An Adjustment Method for the Suspender Tension of CFSTTTHAB Based on Influence Matrix of Single Suspender

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ADVANCES IN CIVIL ENGINEERING 2020年第1期2020卷

作者： Wang, Longlin Wang, Hua Li, Litao Hao, Tianzhi Wu, Changxia Southeast Univ Nanjing 211189 Jiangsu Peoples R China Guangxi Transportat Sci & Technol Grp Co Ltd Nanning 530007 Guangxi Peoples R China Xili Shenzhen Univ Town Harbin Inst Technol Shenzhen Shenzhen 518055 Peoples R China

Based on the funding project "a concrete-filled steel tube truss type half-through arch bridge (CFSTTTHAB) with the span of 220 m," in view of the difference of tension between one pair of suspenders, this paper proposed an improved influence matrix method for the tension of a single suspender, which was developed from a conventional influence matrix. A method for adjusting suspender tension at the completed state of construction by using numerical simulation and iterative algorithm was also presented. Finite element numerical model was used to calculate the influence matrix of a single suspender. Moreover, an iterative algorithm was used to solve the adjustment value of suspender tension. Based on the proposed method, by processing several iterations, the difference between the measured and designed suspender tension would be controlled within 6% in the projects of suspender tension adjustment. Finally, the comparison between the measured and designed suspender tension at the completed state of construction proved the feasibility and accuracy satisfaction of the proposed method for engineering requirement.

关键词： Tension Concrete Computer simulation iterative algorithm Bridge

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A Domain Decomposition Charge Simulation Method for Calculation of Power-frequency Electric Field 3

A Domain Decomposition Charge Simulation Method for Calculat...

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3rd IEEE International Electrical and Energy Conference (CIEEC)

作者： Li, Yongming Wang, Xiaowan Zhou, Yue He, Shengyu Xu, Luwen Zou, Anxin Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China State Grid Zhejiang Elect Power Training Ctr Hangzhou 3100015 Peoples R China State Grid Chongqing Elect Power Test & Res Inst Chongqing 401123 Peoples R China

ISBN: (纸本)9781728116754

The distribution of power frequency electric field caused by super-high level power transmission engineering is an important issue in evaluation of electromagnetic environment problem. The calculation of this field around power transmission facilities in complex environment using Charge Simulation Method (CSM) is sometimes out of action for the reason of not enough RAM. This paper put forward a domain decomposition CSM. This method divided the calculation region into several subdomains with some overlapped parts at the border first. Then CSM is applied to these subdomains respectively to get the distribution of simulation charges. The impact of the adjacent domain (boundary problem) is solved by using iterative method. Finally, the distribution of electric field in different domains can be calculated respectively with simulation charges obtained inside its own domain. This method is verified and it is applied to the analysis of power frequency electric field around 500kV transformers in 500kV substation. The results indicate that this method can speed up the calculation and decrease the requirement of RAM. This method provides an effective way to analyze the distribution of power frequency electric field with complex environment.

关键词： charge simulation method overlapping domain decomposition method iterative algorithm power frequency electric field transformer

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Nonparametric estimation of multivariate distribution function for truncated and censored lifetime data

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EUROPEAN ACTUARIAL JOURNAL 2019年第1期9卷 209-239页

作者： Baskakov, Valery Bartunova, Anna European Actuarial & Consulting Serv EURACS IAAC Malaya Filevskaya St 50Ap 80 Moscow 121433 Russia RFTA 4A Pudovkina Str Moscow 119285 Russia

A number of models for generating statistical data in various fields of insurance, including life insurance, pensions, and general insurance have been considered. It is shown that the insurance statistics data, as a rule, are truncated and censored, and often multivariate. We propose a non-parametric estimation of the distribution function for multivariate truncated-censored data in the form of a quasi-empirical distribution and a simple iterative algorithm for its construction. To check the accuracy of the proposed evaluation of the distribution function for truncated-censored data, simulation studies have been conducted, which showed its high efficiency. The proposed estimates have been tested for many years by the IAAC Group of Companies in the actuarial valuation of corporate social liabilities according to IAS 19 Employee Benefits. Apart from insurance, some results of the work can be used, for example in medicine, biology, demography, mathematical theory of reliability, etc.

关键词： Nonparametric estimation Censored and truncated data Multivariate distribution function Survival analysis iterative algorithm

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Free-Space Permittivity Measurement for Inhomogeneous PSV-Coated Si-wafer at Frequencies from 75 GHz to 325 GHz

Free-Space Permittivity Measurement for Inhomogeneous PSV-Co...

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6th IEEE MTT-S International Wireless Symposium (IWS) part of China Microwave Week

作者： Jung, Sohyeon Choo, Moogoong Lee, Jae-Yeong Ahn, In-sung Lee, Kangseop Hong, Wonbin Pohang Univ Sci & Technol POSTECH Pohang 37673 South Korea

ISBN: (纸本)9781728107165

A method to extract dielectric property of inhomogeneous PSV (Passivation)-coated Si-wafer is presented at broadband frequencies from 75 GHz to 325 GHz. Free-space measurement using continuous wave (CW) system is carried out. Numerical iterative algorithm is employed to extract permittivity from complex scattering parameters. Due to scarcity of related previous studies beyond 100 GHz, the discussions on parameters that may affect the results are also described in detail. The calculated permittivity based on the proposed method highly correlates with the analytical values.

关键词： complex permittivity free-space transmission measurement fabry-Perot effect inhomogeneous material iterative algorithm passivation material

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Low-dose photon counting CT reconstruction bias reduction with multi-energy alternating minimization algorithm 15

Low-dose photon counting CT reconstruction bias reduction wi...

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15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine

作者： Lu, Jingwei Zhang, Shuangyue Politte, David G. O'Sullivan, Joseph A. Washington Univ Dept Elect & Syst Engn 1 Brookings Dr St Louis MO 63130 USA Washington Univ Sch Med Elect Radiol Lab Mallinckrodt Inst Radiol St Louis MO 63110 USA

ISBN: (数字)9781510628380

ISBN: (纸本)9781510628380

Photon counting CT (PCCT) is an x-ray imaging technique that has undergone great development in the past decade. PCCT has the potential to improve dose efficiency and low-dose performance. In this paper, we propose a statistics-based iterative algorithm to perform a direct reconstruction of material-decomposed images. Compared with the conventional sinogram-based decomposition method which has degraded performance in low-dose scenarios, the multi-energy alternating minimization algorithm for photon counting CT (MEAM-PCCT) can generate accurate material-decomposed image with much smaller biases.

关键词： photon counting low-dose radiation iterative algorithm spectral x-ray CT alternating minimization

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iterative Constrained Weighted Least Squares Solution for Target Localization in Distributed MIMO Radar 27

Iterative Constrained Weighted Least Squares Solution for Ta...

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27th Iranian Conference on Electrical Engineering (ICEE)

作者： Noroozi, Ali Nayebi, Mohammad Mahdi Amiri, Rouhollah Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781728115085

This paper concentrates on the target localization problem in a distributed multiple-input multiple-output radar system using the bistatic range (BR) measurements. By linearizing the BR measurements and considering the relationship between the nuisance parameter and the target position, a constrained weighted least squares (CWLS) problem is formulated, which is an indefinite quadratically constrained quadratic programming problem. Since the constraint is non-convex, it is a nontrivial task to find the global solution. For this purpose, an improved Newton's method is applied to the CWLS problem to estimate the target position. Numerical simulations are included to examine the algorithm's performance and corroborate the theoretical developments.

关键词： Bistatic range (BR) constrained weighted least squares (CWLS) iterative algorithm target position

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The single-manufacturer single-retailer integrated production-delivery lot sizing model with production capacity under stochastic lead time demand 11

The single-manufacturer single-retailer integrated productio...

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11th CIRP Conference on Industrial Product-Service Systems

作者： Sun, Xuefang Zhang, Renqian Beihang Univ Sch Econ & Management Beijing 100191 Peoples R China

This paper develops an integrated production-delivery lot sizing model in which a manufacturer supplies a product a retailer. The manufacturer produces the product at a finite rate and the production rate is assumed to be smaller than market demand rate. Meanwhile, we assume that the lead time demand is stochastic and that shortages are permitted. The lead time and the reorder point are in this model as decision variables. The objective is to determine the optimal ordering quantity, reorder point, lead time and the delivery number during each production cycle which minimize the expected total cost per unit time of the manufacturer and the retailer by giving an effective iterative algorithm. A numerical example is given as an illustration of this algorithm for the integrated system. (C) 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the scientific committee of the 11th CIRP Conference on Industrial Product-Service Systems

关键词： integrated production-delivery lot sizing model stochastic demand lead time reorder point iterative algorithm

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An iterative Wiener Filter for the Identification of Trilinear Forms 42

An Iterative Wiener Filter for the Identification of Triline...

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42nd International Conference on Telecommunications and Signal Processing (TSP)

作者： Dogariu, Laura-Maria Ciochina, Silviu Benesty, Jacob Paleologu, Constantin Univ Politehn Bucuresti Dept Telecommun Bucharest Romania Univ Quebec INRS EMT Montreal PQ Canada

ISBN: (纸本)9781728118642

Multidimensional system identification problems can be encountered in many important fields, such as big data, machine learning, and source separation. Nevertheless, a large parameter space usually raises additional challenges in terms of system identification. In this context, there is a huge interest in exploiting the methods based on tensor decompositions and modelling. Recently, we focused on bilinear forms (i.e., two-dimensional decomposition), in the framework of identifying spatiotemporal models. Following this approach, we developed several solutions based on the Wiener filter and different adaptive algorithms. In this paper, in order to further exploit the decomposition of the global impulse response, we propose an iterative Wiener filter tailored for the identification of trilinear forms (where third-order tensors are involved). Simulation results indicate the good performance of the proposed solution, as compared to the conventional Wiener approach.

关键词： Wiener filter iterative algorithm trilinear forms tensors system identification

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