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Wang Chunxiao,Wang Yu,Liu Yu,Li Peng,Zhang Xiantang,Wang Fei 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
The Vortex-Induced Vibration (VIV) test system on deepwater riser based on Bare Fiber Bragg Grating (BFBG) sensor technology was designed. Meanwhile, a riser VIV response numerical model was established based on the work-energy principle. The results show that the first-order vibration frequency dominates the vibration of the riser, and as the velocity increases, the dominant frequency of the riser gradually increases under the effect of different top tensions. At the same velocity, as the top tension increases step by step, the dominant frequency and fatigue damage at the same position along the axial length of the riser both gradually decreases. The model test and numerical simulation show a relatively consistent change, maintaining a high degree of agreement. The process control system based on BFBG of model test has excellent performance, and FBG sensors have great advantages in VIV test of a vertical riser in water.
Chunxiao Li,Lu Chen,Min Song,Zhirui Fang,Lusha Zhang,Joel Wake Coffie,Liyuan Zhang,Lulu Ma,Qianyi Wang,Wenjie Yang,Leyu Fang,Shaoxia Wang,Xiumei Gao,Hong Wang 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.8
Acute myocardial infarction (AMI) resultsin irreversible cardiac cell damage or death because ofdecreased blood fl ow to the heart. Apoptosis plays an importantrole in the process of tissue damage after myocardialinfarction (MI), which has pathological and therapeuticimplications. Ferulic acid (FA) is a phenolic acid endowedwith strong antioxidative and cytoprotective activities. Thepresent study aimed to investigate whether FA protectscardiomyocytes from apoptosis by regulating autophagy,which is a cellular self-digestion process, and one of thefi rst lines of defense against oxidative stress. Apoptosis wasinduced by TNF-α (10 ng/mL) and cycloheximide (CHX,5 μg/mL) in rat H9c2 cardiomyocytes. FA-inhibited TNF-α/CHX-induced apoptosis was determined by the quantifi cationof TUNEL-positive cells, and the eff ect was associatedwith decreased ROS production and inhibited caspase3activation. FA treatment enhanced autophagy and increasedautophagy-associated protein expression, leading to an inhibitionof mTOR signaling. When co-treated with 3-methyladenine(3-MA), an autophagy inhibitor, the anti-apoptoticeff ect of FA was attenuated. In an in vivo mouse MI model,FA treatment decreased the apoptotic cell number, reducedinfarct size, and improved cardiac performance, as determinedby histological and echocardiographic assessments. Taken collectively, these results suggest that FA could protectcardiomyocytes from apoptosis by enhancing autophagy.
Chunxiao Wang,Yu-Qiang Wu,Jiang-Bo Yu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
This paper studies the problem of controller design for pure-feedback nonlinear systems with asymmetrictime-varying full state constraints. The mean value theorem is employed to transform a pure-feedback system intoa strict-feedback structure with non-affine terms. For the transformed system, a time-varying asymmetric BarrierLyapunov Function (ABLF) with the error variables is employed to ensure the time-varying constraints satisfaction. By allowing the barriers to vary with the desired trajectory in time, the initial condition requirements are relaxedefficiently. The presented control scheme can guarantee that all signals in the closed-loop system are ultimatelybounded. It is also proved that the tracking error converges to an adjustable neighborhood of the origin even in thepresence of disturbance. The performance of the ABLF-based control are illustrated through two examples.
Chunxiao Wang,Lu Qi,Jia-yun Liu,Jia-li Yu 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7
This paper focuses on an adaptive cross-backstepping control for a class of nonstrict-feedback nonlinear systems affected by time-varying partial state constraints. The nonstrict-feedback nonlinear systems considered in this paper are divided into two strict-feedback nonlinear subsystems. One constrained subsystems and another unconstrained subsystems. In view of the normal backstepping method is only an effective method to control lowertriangular systems, cross-backstepping control is introduced which successfully solves the problem of alternatetime-varying state constraints. For the constrained subsystems, novel time-varying tan-type barrier Lyapunov function (TBLF) is employed in each step of backstepping design to guarantee the boundedness of the fictitious or actual state tracking errors. Besides, proper adaptive laws are designed for the upper bound of uncertain parameters, which successfully neutralize the influence of parametric uncertainties. Based on the stability analysis, it is concluded that the states of the closed-loop system maintain in the predefined time-varying compact sets and the output can be guaranteed to be as close to the desired trajectory as possible. The effectiveness of the proposed technique is illustrated by a constrained hyperchaotic system in two cases.
Color Image Compression Based on Directional All Phase Biorthogonal Transform
Chunxiao Zhang,Chengyou Wang,Baochen Jiang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.1
There are images in which some directional edges other than the vertical or horizontal ones dominate. So the conventional discrete cosine transform (DCT) may not be the best choice for them. Directional DCT framework is able to provide a better coding performance for image blocks that contain directional edges. In addition, the all phase biorthogonal transform (APBT) algorithm can improve the performance of compression. In the light of directional DCT and APBT, directional APBT is proposed and applied to color image coding. Experimental results show that this framework can indeed improve the compression performance of color image remarkably.
Property Studies of Optical Waveguide Formed by keV He-Ion Implanted into a Nd:CNGG Crystal
Chunxiao Yu,Jin-Hua Zhao,Huai-Jin Zhang,Xue-Lin Wang 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6
A planar optical waveguide was formed in a neodymium-doped calcium niobium gallium garnet (Nd:CNGG) crystal by using 500-keV He-ion implantation with a dose of 2 × 1016 ions/cm2 at room temperature. The dark modes were observed by using a prism coupling method, and the refractive index profile was reconstructed using a reflectivity calculation method (RCM). The SRIM2006 code (stopping and range of ions in matters, code 2006) was used to simulate the damage profile in the ion-implanted sample. The photoluminescence spectra of the samples showed fairly good potential for used as a laser waveguide.
Video Compression Algorithm Based on Directional All Phase Biorthogonal Transform and H.263
Chunxiao Zhang,Chengyou Wang,Baochen Jiang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.3
The vertical or horizontal edges don’t dominate in some frames of video sequence, so the conventional discrete cosine transform (DCT) may not be the best choice for those frames. Directional DCT framework behaves better than conventional DCT in coding performance for images where directional edges dominate. In addition, the all phase biorthogonal transform (APBT), which is used in image compression instead of DCT, can also help to improve the performance of compression. In the light of directional DCT and APBT, directional APBT (D- APBT) is proposed and applied to H.263 video coding. Experimental results show that this framework can indeed improve the coding performance remarkably.
Junji Wang,Caoyuan Ma,Chunxiao Li,Xinshang Zhu,Kang Zhao 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10
A structural vulnerability analysis of China mine power grid, which considering the particular of topological structure and the increase gas power generation nodes, is proposed based on complex network theory. According to transmission capacity of weighted network model, this paper analyses the network characteristics, including degree distribution, clustering coefficient and average path length, to prove that the mine power grid is a scale -free network. The node importance, node betweenness, edge weight and edge betweenness are regarded as the index of identification and the remaining load capacity after attack is chosen as evaluation index to analyze the structural vulnerability of mine power grid to have a fault simulation of the mine power grid before and after adding gas power generation nodes. The results of fault simulation show that the model is in line with the actual situation of the China mine power grid, and can better identify and assess the vulnerability of the mine power grid.
Gao Fuxian,Wang Chunxiao,Ji Jianghai,Li Wenjuan 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.3
Background Cervix cancer (CC) is the most common gynecological malignancy and the leading cause of morbidity in women around the world. Objectives In this research, the eff ect of FBXO22 on HPV-associated CC was evaluated. Results The results fi rst illuminated that FBXO22 was highly expressed in HPV + CC patients. FBXO22 knockdown inhibited the proliferation of HPV + CC cells, and promoted autophagy in HPV + CC cells. Finally, FBXO22 regulates the LKB1/ AMPK pathway . Conclusion This research hinted that FBXO22 promotes cell proliferation and inhibits autophagy in HPV-associated CC by inactivating the LKB1/AMPK pathway.