Information Fusion Based on Artifcial Intelligence Method for SINS/ GPS Integrated Navigation of Marine Vessel

Chuang Zhang,Chen Guo,Mu‑Zhuang Guo 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

The approaches of artifcial intelligence (AI)-based has widely been utilized to provide higher positioning precision for ship navigation by integrating the GPS with the SINS. To address the restrictions of complicated and dynamic information resulted from ship irregular motion, this paper proposes a novel ensemble learning technique to replace traditional single neural network. The ensemble learning approach is able to construct the SINS/GPS integrated navigation system model according to the SINS attitude, speed information and accelerometer, gyroscope output data. The proposed method is verifed using ship-mounted experimental data of various trajectories. Experimental results indicate that the proposed algorithm can signifcant improvement in positioning precision under the conditions of SINS and specifc GPS unavailability.

THE MINIMAX PROBLEM OF TWO VECTOR-VALUED FUNCTIONS

Chuang Liang Zhang 경남대학교 수학교육과 2018 Nonlinear Functional Analysis and Applications Vol.23 No.1

In this paper, we study the minimax problem in a partial ordered Hausdorff topological vector space. We obtain a vector form Ky Fan minimax inequality theorem which involves two vector-valued functions. The proof of this theorem don’t use separation theorems and nonlinear scalarization functions. Forthermore, we also use the fixed point theorem of set-valued mappings by Browder [1] to prove some results of minimax problem of two vector-valued functions, and the minimax theorem in [16] is extended to vector form.

A Generative Adversarial Network to Denoise Depth Maps for Quality Improvement of DIBR-Synthesized Stereoscopic Images

Zhang Chuang,Sun Xian-wen,Xu Jiawei,Huang Xiao-yu,Yu Gui-yue,Park Seop Hyeong 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4

Depth map quality is an important factor that aff ects the quality of synthesized stereoscopic images in stereoscopic visual communication systems using the depth image-based rendering (DIBR) technique. This paper proposes a method using a generative adversarial network (GAN) to denoise depth maps corrupted by several types of distortion. The generative network of the proposed GAN builds on convolutional layers, residual layers, and transposed convolutional layers with symmetric skip connections. The discriminative network of the proposed GAN is designed as a convolutional neural network. The generative network for denoising depth maps is trained with cropped depth maps where distortion is applied. Objective and subjective assessment of denoised depth maps and DIBR-synthesized stereoscopic images demonstrate that the proposed GAN eff ectively reduces the distortion in the depth maps and improves the quality of DIBR-synthesized stereoscopic images.

No-Reference Image Quality Assessment Using Independent Component Analysis and Convolutional Neural Network

Chuang Zhang,Jiawei Xu,Xiaoyu Huang,박형섭 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1

As digital images have become a significantly primary medium in a broad area, there is a growing interest in the development of automatic objective image quality assessment (IQA) methods. In this paper, a novel no-reference IQA (NRIQA) algorithm is proposed based on independent component analysis and convolutional neural network. The proposed NRIQA algorithm consists of the following three steps: selection of some representative patches, extraction of the features of the selected image patches, and prediction of the image quality by exploiting the features. Initially, an image is divided into non-overlapping patches and then some patches are selected with the suitable property for assessing the overall image quality. In this paper, we refer to the selected patches as image quality patches. The largest infinity norm of the gradient of each image quality patch is employed as a basis when the image quality patches being selected. Second, we employ independent component analysis (ICA) to extract the features of image quality patches. At the last moment, a convolutional neural network (CNN) is applied to the independent component coefficients of image quality patches to predict the corresponding differential mean opinion score (DMOS). We compared the performance of the proposed NQIRM with other IQMs in terms of PCC, SROCC, and RMSE on the database LIVE2, CSIQ and TID2008/2013. The PCC, SROCC and RMSE values achieve respectively to 0.996, 0.999 and 6.011 on the database TID2013. The performance comparison results show the proposed NRIQM is superior to commonly used IQMs.

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

Chuang Liu,Dawei Zhu,Jia Zhang,Haiyang Liu,Guowei Cai 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6

DC microgrids are considered as prospective systems because of their easy connection of distributed energy resources (DERs) and electric vehicles (EVs), reduction of conversion loss between dc output sources and loads, lack of reactive power issues, etc. These features make them very suitable for future industrial and commercial buildings’ power systems. In addition, the bipolar-type dc system structure is more popular, because it provides two voltage levels for different power converters and loads. To keep voltage balanced in such a dc system, a bidirectional dual buck-boost voltage balancer with direct coupling is introduced based on P-cell and N-cell concepts. This results in greatly enhanced system reliability thanks to no shoot-through problems and lower switching losses with the help of power MOSFETs. In order to increase system efficiency and reliability, a novel burst-mode control strategy is proposed for the dual buck-boost voltage balancer. The basic operating principle, the current relations, and a small-signal model of the voltage balancer are analyzed under the burst-mode control scheme in detail. Finally, simulation experiments are performed and a laboratory unit with a 5kW unbalanced ability is constructed to verify the viability of the bidirectional dual buck-boost voltage balancer under the proposed burst-mode control scheme in low-voltage bipolar-type dc microgrids.

Progressive Orthogonal Optimization Design Method for High Efficiency Axial-flow Blower

Chuang Li,Jianrun Zhang,Wenbin Yu 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.4

To solve the problem of excessive design parameters of flow channel during the comprehensive optimization of the axial-flow blower"s total pressure efficiency and flux, a progressive optimization design method which is based on the importance of structural parameters is proposed. The accurate numerical simulation model of flow channel is built, verified and updated by experiment results. According to the model, progressive orthogonal optimization design is developed as following steps: the first is axial fan design, then the orthogonal design of the structure parameters of entire flow channel is further advanced. This approach is applied to the optimization design of an axial-flow blower in this paper, and the results show that the uniformity of the flow field in the flow channel is significantly increased and the vertexes spreading in the flow channel are obviously reduced, the flux is increased from 0.145m3/s to 0.171m³/s, and the efficiency increased from 45.47% to 58.13%, it indicates that the method can meet the design requirements well while being efficient.

Surface Self-Nanocrystallization of α+β Titanium Alloy by Surface Mechanical Grinding Treatment

Chuang Li,Wenfang Cui,Yusheng Zhang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3

In this work, the heavy deformation was performed on Ti6Al4V alloy by using surface mechanical grindingtreatment (SMGT) in order to obtain surface nanocrystalline layer. The phase structure and microstructuresin the deformation zones were characterized by XRD, SEM and TEM. The nanocrystallization mechanisms ofα and α phase were clarified. The results show that a gradient structure including nano grain, quasi nanograinand micro-grains was achieved within the depth of 500 μm below the surface. The depth of nanocrystallineslayer was at least 20 μm. From the non deformation zone in the center to the heavy deformation zone close totreated surface, dislocation densities gradually increased. The original coarse grains gradually evolved intodislocation cell structures and subgrains through dislocation movement. In the depth of about 20 μm belowthe treated surface, the subgrains began to split into nano-scale grains with high angle grain boundaries bylattice rotation and tilting mechanisms. During SMGT, β phase deformed and refined prior to α phase, andinhibited the generation of twinning in α grain. The coordinated deformation between a and β phase promotedthe formation of nanocrystallines.

Seismic Performance of a New Type Concrete-Filled Precast Concrete Tubular Column

Chuang Du,Yanzhao Li,Chunxiao Zhang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2

To investigate the seismic behaviour of a new type of concrete-filled precast concrete tubular column, five concrete-filled precast concrete tubular columns varying in concrete strength and stirrup ratio were tested under cyclic loading. The behaviours of the failure mode, hysteretic curve, skeleton curve, bearing capacity, deformability, displacement ductility and energy dissipation were studied to evaluate the seismic resistance performance of the columns. The results show that the failure mode of the concrete-filled precast concrete tubular columns was flexural failure, and the hysteretic curve had a plump shuttle shape, which indicates that the concrete-filled precast concrete tubular column has good energy dissipating capacity. The bearing capacity of the specimen was increased with increasing concrete strength of the precast tube. The stirrup ratio has little effect on its bearing capacity, whereas it has a significant effect on the deformation, ductility and energy dissipation. The story drift of the specimens can meet the requirements of the elastic plastic story drift limit value of 1/50 of the code in China, and the ductility coefficient is greater than 3, which demonstrates that the concrete-filled precast concrete tubular column has excellent seismic properties.

Decreased Complete Oxidation Capacity of Fatty Acid in the Liver of Ketotic Cowsa

Xu, Chuang,Liu, Guo-wen,Li, Xiao-bing,Xia, Cheng,Zhang, Hong-you,Wang, Zhe Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.3

Complete oxidation of fatty acid in the liver of ketotic cows was investigated. Serum non-esterified fatty acid (NEFA), beta-hydroxybutyric acid (BHBA) and glucose concentrations were measured using biochemical techniques. Carnitine palmitoyl transferase II (CPT II), 3-hydroxy acyl-CoA dehydrogenase (HAD) and oxaloacetic acid (OAA) concentrations in the liver were detected by ELISA. Serum glucose was lower in ketotic cows than controls (p<0.05). Serum BHBA and NEFA concentrations were higher in ketotic cows than controls (p<0.05). OAA, CPT II, and HAD contents in the liver of ketotic cows were lower than in controls (p<0.05). There were negative correlations between serum NEFA concentration and OAA, CPT II and HAD, but no correlation between serum BHBA concentration and capacity for complete oxidation of fatty acid. Overall, the capacity for complete fatty acid oxidation in the liver of ketotic cows might have been decreased. High serum NEFA concentrations may be unfavorable factors for the pathway of complete oxidation of fatty acid in the liver.

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

Liu, Chuang,Zhu, Dawei,Zhang, Jia,Liu, Haiyang,Cai, Guowei The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6

DC microgrids are considered as prospective systems because of their easy connection of distributed energy resources (DERs) and electric vehicles (EVs), reduction of conversion loss between dc output sources and loads, lack of reactive power issues, etc. These features make them very suitable for future industrial and commercial buildings' power systems. In addition, the bipolar-type dc system structure is more popular, because it provides two voltage levels for different power converters and loads. To keep voltage balanced in such a dc system, a bidirectional dual buck-boost voltage balancer with direct coupling is introduced based on P-cell and N-cell concepts. This results in greatly enhanced system reliability thanks to no shoot-through problems and lower switching losses with the help of power MOSFETs. In order to increase system efficiency and reliability, a novel burst-mode control strategy is proposed for the dual buck-boost voltage balancer. The basic operating principle, the current relations, and a small-signal model of the voltage balancer are analyzed under the burst-mode control scheme in detail. Finally, simulation experiments are performed and a laboratory unit with a 5kW unbalanced ability is constructed to verify the viability of the bidirectional dual buck-boost voltage balancer under the proposed burst-mode control scheme in low-voltage bipolar-type dc microgrids.