Aitken-based Acceleration Estimation Algorithms for a Nonlinear Model with Exponential Terms by Using the Decomposition

Yihong Zhou,Feng Ding,Ahmed Alsaedi,Tasawar Hayat 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.11

This paper studies some parameter estimation algorithms for a class of nonlinear models with exponential terms, i.e., the radial basis function-based state-dependent autoregressive (RBF-AR) models. An Aitken-based multi-innovation stochastic gradient algorithm is presented for the RBF-AR models based on the Aitken method. Inspired by the decomposition-coordination principle of large systems, an Aitken-based hierarchical multi-innovation stochastic gradient algorithm is proposed by combining the decomposition technique with the Aitken method. The effectiveness of the proposed algorithms are validated through two simulation examples.

Temperature Field Reconstruction of Concrete Dams based on Distributed Optical Fiber Monitoring Data

Huawei Zhou,Zhiguo Pan,Zhipeng Liang,Chunju Zhao,Yihong Zhou,Fang Wang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5

Mastering the real temperature distribution of the concrete dam is the basis for solving the problem of temperature control and crack prevention. In this paper, Distributed Temperature Sensing (DTS) technology was applied to temperature monitoring of a higharch dam under construction in southwest China. In order to obtain a more comprehensive temperature distribution of the dam, optical fiber layout principles for arch dams were studied, and horizontal and vertical optical fiber layout schemes were first proposed according to these principles. The real temperature variation processes of the dam were obtained in real time with a line temperature measurement pattern instead of a point temperature measurement pattern. Additionally, a framework of distributed optical fiber data acquisition and remote transmission was proposed. Interconnection of multiple DTS hosts and remote transmission of temperature data were realized. Then, two-dimensional temperature fields of a typical dam block in different ages and longitudinal profiles of dam blocks with embedded fibers were reconstructed based on large amounts of temperature monitoring data and the Kriging difference algorithm. Temperature field reconstruction results showed that the temperature distribution law of the concrete arch dam was in accordance with the actual situation.

Feedback Design of Temperature Control Measures for Concrete Dams Based on Real-Time Temperature Monitoring and Construction Process Simulation

Huawei Zhou,Yihong Zhou,Chunju Zhao,Fang Wang,Zhipeng Liang 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.5

Crack prevention is a significant issue in the construction process of concrete dams. The vast majority of concrete cracks arerelated to temperature variations, and hence, temperature control is a primary method used to prevent cracks. This paper presents anew integrated concept, named Feedback Design (FD) of temperature control measures, which incorporates real-time temperaturemonitoring, temperature field simulation and construction process simulation in a large system to optimize a temperature controlscheme for concrete dams. We used a fiber-optic Distributed Temperature Sensing (DTS) system to monitor the temperaturevariation process of typical dam monoliths in real time. By incorporating a genetic algorithm, neural network algorithm, and finiteelement theory, we proposed an intelligent inversion method to obtain thermal parameters of concrete dams based on the temperaturemonitoring data. Meanwhile, we built a simulation model of a concrete dam’s construction process based on a cycling networktechnique to obtain accurate construction environmental parameters. Finally, we simulated the temperature field of a typical dammonolith based on initial temperature control measures, inversion thermal parameters, and accurate construction environmentalparameters. Temperature variance lines of typical points in the model obtained from the finite element method (FEM) accord wellwith the measured values obtained from the DTS system. We applied the FD approach to the Xiluodu arch dam located in southwestChina to forecast the temperature fields and optimize the temperature control scheme of the dam blocks planned for pouring. The FDapproach has been proven reliable and efficacious.

Method and application of spatial positioning for valid temperature-measuring optical fibers in concrete dams

Huawei Zhou,Chunju Zhao,Zhipeng Liang,Yihong Zhou,Fang Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8

Spatial positioning of Valid Temperature-measuring Optical Fiber (VTOF) is of great significancefor accurately grasping the real temperature distribution of a concrete dam. However, there is barely an effective way to accurately locate the measuring points of optical fiber in concrete dams. A comprehensive data symmetry analysis technique is presented for determining the optimal spatial positioning of valid temperature-measuring optical fibers (VTOFs) in concrete dams. This approach includes a mathematical model to confirm the center of symmetry in monitoring data, which is required to reconstruct the real spatial temperature distribution. This process can identify VTOF locations and verify the reliability of temperature predictions. Experimental validation was conducted using findings from research on a new mathematical model, site measurements from a concrete dam, and corresponding data from distributed optical fibers. These results were successfully applied to the construction of the Baihetan dam; the concrete temperature from 405 pouring blocks in 5 typical dam monoliths was accurately monitored, and the temperature-measuring points of VTOFs were more than 24711. Meanwhile, the optical fiber temperature measurement and temperature field analysis system of Baihetan dam located in southwest China was developed based on accurately acquired temperature measurement data, which provides data basis and engineering application platform support for temperature evolution and temperature field analysis and precise temperature control management of pouring blocks.

Assessment Method of Slope Excavation Quality based on Point Cloud Data

Zhiguo Pan,Yihong Zhou,Chunju Zhao,Chao Hu,Huawei Zhou,Yong Fan 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.3

Slope excavation quality assessment is essential in water conservancy engineering. This study presents a quality assessment method to estimate the excavation quality of a slope based on point cloud data obtained from a 3D Terrestrial Laser Scanner (TLS). A data processing method, which includes coordinate registration, data partitioning, and noise removal, is proposed to organize raw data from the TLS and ensure accurate and available point cloud data of a slope surface. An excavation quality assessment method with seven indicators, namely, slope ratio, slope toe elevation, back break, volume of back break, remained semi-void rate, unevenness, and offset degree, is proposed to analyze the difference between a slope’s as-design excavation appearance and actual construction appearance. The as-design excavation appearance is expressed by the Building Information Modeling (BIM) model of a slope-excavation face, and it is a reference to assess the actual construction appearance. The slope excavation quality of a water conservancy project in southwest China is evaluated with the proposed method and the traditional method. The results demonstratethat the proposed method can estimate the slope excavation quality effectively, rapidly, and accuately, and can provide theoretical data support for subsequent work.

In Vitro and In Vivo Study on the Effect of Lysosome-associated Protein Transmembrane 4 Beta on the Progression of Breast Cancer

Deyou Tao,Junqing Liang,Yihong Pan,Yanting Zhou,Ying Feng,Lin Zhang,Jingjing Xu,Hui Wang,Ping He,Jie Yao,Yang Zhao,Qinjie Ning,Wen Wang,Wei Jiang,Jing Zheng,Xia Wu 한국유방암학회 2019 Journal of breast cancer Vol.22 No.3

Purpose: Although the effect of lysosome-associated protein transmembrane 4 beta (LAPTM4B) on the proliferation, migration, and invasion of breast cancer (BC) cells has already been studied, its specific role in BC progression is still elusive. Here, we evaluated the effect of different levels of LAPTM4B expression on the proliferation, invasion, adhesion, and tumor formation abilities of BC cells in vitro, as well as on breast tumor progression in vivo. Methods: We investigated the influence of LAPTM4B expression on MCF-7 cell proliferation, invasion, adhesion, and tube formation abilities in vitro through its overexpression or knockdown and on breast tumor progression in vivo. Results: Cell growth curves and colony formation assays showed that LAPTM4B promoted the proliferation of breast tumor cells. Cell cycle analysis results revealed that LAPTM4B promoted the entry of cells from the G1 into the S phase. Transwell invasion and cell extracellular matrix adhesion assays showed that LAPTM4B overexpression increased the invasion and adhesion capabilities of MCF-7 cells. More branches were observed in MCF-7 cells overexpressing LAPTM4B under an electron microscope. In comparison with LAPTM4B overexpression, LAPTM4B knockdown decreased the expression of vascular endothelial growth factor-A and significantly inhibited the vasculogenic tube formation ability of tumors. These results were also verified with western blot analysis. Conclusion: LAPTM4B promoted the proliferation of MCF-7 cells through the downregulation of p21 (WAF1/CIP1) and caspase-3, and induced cell invasion, adhesion, and angiogenesis through the upregulation of hypoxia-inducible factor 1 alpha, matrix metalloproteinase 2 (MMP2), and MMP9 expression. This specific role deems LAPTM4B as a potential therapeutic target for BC treatment.

Investigation on fixture design and precision stability of new-type double collect chuck for machining of long ladder shaft gear

Zhipeng Liang,Chunju Zhao,Huawei Zhou,Yihong Zhou 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1

To solve the problems of poor positioning accuracy and non-automatic processing seen in the machining of long ladder shaft gears, a fixture structure scheme with a new type of double collect chuck (DCC) is proposed. The design rationality, clamping stability, and repeat clamping positioning accuracy of the proposed DCC were analyzed and investigated based on theory calculation, simulation analysis, and engineering application tests. First, the clamping performance of DCC was investigated through theory calculation and simulation analysis. The test results showed that the structure of DCC maintained effective clamping and the repeat clamping positioning accuracy was steadily controlled within 0.008 mm. Meanwhile, efficiently automated machining of long ladder shaft gear was realized based on extended design and engineering application of automatic up and down mechanism when the structure of DCC was applied. Furthermore, the machining accuracy of the gear was steadily controlled within DIN8 (DIN5480-2 standard). Additionally, based on extended design and engineering tests, the automatic up and down machining improves production efficiency and machining accuracy. Thus, the novel fixture structure scheme provides a new approach for automatic up and down machining of long ladder shaft gear.