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Decomposition of Interference Hyperspectral Images Based on Split Bregman Iteration
( Jia Wen ),( Lei Geng ),( Cailing Wang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.7
Images acquired by Large Aperture Static Imaging Spectrometer (LASIS) exhibit obvious interference stripes, which are vertical and stationary due to the special imaging principle of interference hyperspectral image (IHI) data. As the special characteristics above will seriously affect the intrinsic structure and sparsity of IHI, decomposition of IHI has drawn considerable attentions of many scientists and lots of efforts have been made. Although some decomposition methods for interference hyperspectral data have been proposed to solve the above problem of interference stripes, too many times of iteration are necessary to get an optimal solution, which will severely affect the efficiency of application. A novel algorithm for decomposition of interference hyperspectral images based on split Bregman iteration is proposed in this paper, compared with other decomposition methods, numerical experiments have proved that the proposed method will be much more efficient and can reduce the times of iteration significantly.
Adaptive Fault-tolerant Control of Alien Species Invasion Based on Sliding Mode
Jiawen Li,Yi Zhang,Yingying Nie,Song Yang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
This paper studies the adaptive fault-tolerant control problem for biological systems with the invasion of alien species. Firstly, to overcome the difficulty of dealing with nonlinear terms in the system, the T-S fuzzy method is applied to obtain the T-S fuzzy biological systems. Then, an augmented matrix is developed for the T-S fuzzy system, and a sliding mode observer is constructed to estimate the state vector, sensor faults, sensor failure and external disturbances. In addition, an observer-based adaptive sliding-mode control law is designed to ensure the stability of the closed-loop biological system. Finally, a simulation example is presented to illustrate the effectiveness of the proposed method.
Titanium Dioxide–Graphene–Polyaniline Hybrid for Nonenzymatic Detection of Glucose
Jiawen Du,Yiyang Tao,Zhichen Xiong,Xianglang Yu,Aijuan Xie,Shiping Luo,Xiazhang Li,Chao Yao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.7
A novel titanium dioxide–graphene–polyaniline (TiO2–RGO–PANI) hybrid was prepared by the one-pot method and used as a nonenzymatic electrochemical sensor for glucose detection. The composition and structural morphology of the as-prepared composites were determined by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The characterization results showed that TiO2–RGO–PANI is mainly composed of Ti, O, C and N and their weight percentages are 67.68%, 21.57%, 10.70% and 0.05%, respectively, indicating that the TiO2–RGO–PANI composite catalyst has been successfully prepared and presents a poriferous coral structure. A series of electrochemical tests such as cyclic voltammetry tests declared that TiO2–RGO–PANI composite possessed a low limit of detection (LOD) (7.46 μM), good repeatability, selectivity and stability. In the concentration range of 10–180 μM, the hybrid presented linear diffusion, and the linear equation was Ipa = 0.21338 + 0.01392 (C/mM), the correlation coefficient R2 = 0.9912. In addition, the comparison of the merits of this proposed electrode with some recent nonenzymatic glucose sensors indicates that this highly sensitive TiO2–RGO–PANI complex glucose sensor provides a simple, low-cost, nonenzymatic method for glucose detection, and has promising applications in clinical diagnostics and medical analysis.
Jiawen Xu,Haodong Hong,Zhenyu Wang,Xinhu Sun,Yen Wei,Yu Liu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
Microfluidic devices are critical in lab-on-chip, drug delivery, flexible sensors, etc. However, a formidable challenge remains in fabricating microfluidic channels with complex shapes during design and verification. Herein, we present a facile approach for manufacturing polystyrene (PS) templates by in-suit combining microscale electrohydrodynamic (EHD) printing and mesoscale direct ink writing (DIW). The desired multiscale filament width from 20 μm to > 1 mm could be obtained through appropriate voltage and pressure with continuous printing. The further process parameters for adjusting line width including deposition speed, auxiliary heating for DIW/EHD printing mode were investigated detailly. And we prove the stability and feasibility for producing microfluidics via the method by AFM, EDS and filling test. Based on the solubility of PS in the organic solvent, we can readily reconfigure the existing template by erasing and printing part of the patterns for better remanufacturing. Finally, the LM-filling PDMS microfluidic is experimented to demonstrate the future potential and advantage of the printing technology for fabricating the flexible microfluidic device.
Jiawen Shao,Yuansheng Zheng,Md All Amin Newton,Yong Li,Binjie Xin 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
The formation process of beaded structure electrospun fibers in three cases: spherical collector, bowl-shaped collector, and fold-shaped collector, and the influence of electric field on jet motion and the structural evolution of fiber morphology were investigated systematically in this work. In this study, the electric field simulation was performed with the simulation software; The high-speed camera recorded the jet motion, which was characterized using parameters such as the straight jet length, envelope angle,whipping amplitude, and jet velocity. The SEM technique was employed to measure the collected fiber felt. It is found that the different collector systems will have different electric field distributions in the jet area, thus affecting its jet motion and resultant fiber morphology. Observed results showed that the electrospinning system of the spherical collector produced a stronger electric field on the collector surface, which can fully stretch the fibers and beads, producing a smaller bead structure and fewer beads. When the fold-shaped collector was adopted, its surface electric field intensity decreased, resulting in a change in the jet whip, showing a larger envelope angle and whipping amplitude, and the jet velocity decreased slightly, generating a coarser beaded fiber. The surface electric field intensity decreased again when a bowl-shaped collector was employed, the whipping area of the jet was widened, and the speed of the jet decreased again, resulting in the fiber diameter and the bead diameter increasing. The results indicate that the jet motion can be controlled by changing the collector shape to control the electric field intensity distribution, and the desired fibers with different properties are obtained.ent properties are obtained.
Jiawen Liu,정성재,Akbar Ali,엄석기 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
In this study, the microscopic transport properties of porous gas diffusion media (PGDMs) with capillary meniscus formation are evaluated using a statistical approach for electrochemical applications. The microscopic morphology of PGDM is stochastically modeled using randomly distributed carbon fibers and various meniscus formations. In particular, the meniscus formation of hydrophobic polytetrafl uorethylene (PTFE) agent enables the generation of highly elaborate microstructures in commercial PGDMs. A single-phase three-dimensional 19-velocity lattice Boltzmann method is applied to simulate the microscale mass transfer phenomena within the PGDMs. The mass transport characteristics (i.e., anisotropic permeability, tortuosity, and effective diffusion coefficient) of the PGDM samples with different PTFE content are statistically investigated as a function of untreated porosity (i.e., porosity before PTFE loading) of the PGDMs. The predicted results reveal an inverse relationship between anisotropic permeability and PTFE loading because the addition of PTFE decreases the bulk porosity of the PGDMs. In addition, the electrical and thermal conductivities of PGDMs are statistically estimated in both the in-plane and through-plane directions. The results show that the in-plane electrical and thermal conductivities are greater than those in the through-plane direction because of the carbon-fiber orientation. Moreover, the addition of PTFE has relatively larger effects on the through-plane electrical and thermal conductivities.
Sun, Jiawen,Ma, Zhe,Wang, Dongxu,Dong, Sheng,Zhou, Ting The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-
A numerical model is established to investigate the run-up of a solitary wave after propagating over a triangular saw-tooth-shaped submerged breakwater. A rectangular-shaped submerged breakwater is simulated for comparison. Several factors, including the submerged depth, the lagoon length and the beach slope, are selected as independent variables. The free surface motions and velocity fields of the solitary wave interacting with the submerged breakwater are discussed. The results show that the submerged depth and lagoon length play significant roles in reducing the run-up. The influence of the beach slope is not significant. At the same submerged depth, the triangular saw-tooth-shaped submerged breakwater has only a slightly better effect than the rectangular-shaped submerged breakwater on the run-up reduction. However, a calmer reflected wave profile could be obtained with the rougher surface of the saw-tooth-shaped submerged breakwater. The study conclusions are expected to be useful for the conceptual design of saw-tooth-shaped submerged breakwaters.