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Yangyang Zhang,Yixiao Qin,Jinpeng Gu,Qianqian Jiao,Feng Wang,Zhenshan Guo,Hao Zhang,Jianjun Wang,Chenghong Mi,Huaipeng Zheng 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
Unsymmetrical complex plate and shell structure is one of the common engineering structures. In practice, more redundant materials exist because of the irrationality of this kind of structure with heavy load and multiple working conditions, and the study of its topology optimization has become an engaging topic. Using the SIMP model, topological results show that one side of the main web is a hollow structure, and the other side of the auxiliary web is a truss structure. According to the topological results and considering manufacturable processing, a new structure is redesigned, the size and shape of the redesigned structure is secondary optimized, and the final structure is obtained. The method in this paper not only meets the performance requirements of the unsymmetrical complex plate and shell structures, but also realizes the topology and lightweight. The effectiveness scientific research value of the proposed method is verified by engineering examples.
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Layout Optimization of Stiffeners in Heavy-Duty Thin-Plate Box Grider
Hao Zhang,Yixiao Qin,Jinpeng Gu,Haibiao Gao,Qianqian Jiao,Feng Wang,Zhenshan Guo,Yangyang Zhang,Chenghong Mi 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.8
The optimization of layout and sizes of the stiffeners in heavy-duty box girder could make this kind of the structure more compact and reasonable, which has certain engineering values. In this study, on the basis of the establishment of parametric finite element model, the function approaching method and gradient search method are combined to form a high-precision optimization algorithm, which makes structural analysis be integrated into the optimization process. The optimization takes the type and location of longitudinal stiffening ribs and the thickness and hole position of transverse diaphragms as design variables, the box girder structural behaviors as constraint conditions, and the total volume as objective function. Finally, the weight is reduced by nearly 7%. More importantly, the new asymmetrical layout of the stiffeners is obtained, the distance between the longitudinal stiffening ribs on the main web and the neutral layer is longer than the distance between the longitudinal stiffening ribs on the secondary web and the neutral layer, and the hole position of transverse diaphragms is close to the secondary web. Compared with the current production of symmetrical layout structure, this layout provides a new idea for the design of stiffeners in the bias-rail box girder.
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Da Xie,Luqing Zhang,Chenghong Gu,Yan Li 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6
Aiming at the DC distribution network based on the droop control, this paper proposes that the intersection of the internal characteristics of the node converter droop control and the external characteristics derived from the parameters of the DC distribution network is the actual node operation point. The quantitative relationship between the droop control characteristic parameters and the converter functions is discussed, and the comprehensive droop control characteristics of the multiconverter node is analyzed. The automatic adjustment method of droop control, containing the secondary adjustment and the third adjustment, is presented, and the power fow algorithm of DC distribution network, which considers the impact of power fow controller, droop control and automatic adjustment method, is derived. Finally, three cases about power fow controller, the secondary adjustment and the third adjustment are used to verify that droop control and its related regulation methods can optimize the operation conditions of DC distribution network.
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Tian Lu,Dingwei Gu,Pinliang Luo,Chenghong Zhang 한국증권학회 2019 Asia-Pacific Journal of Financial Studies Vol.48 No.5
The Chinese peer-to-peer (P2P) lending market is expanding quickly but has a relatively poor level of operation. Using panel-structured data from a leading P2P lending portal in China, we investigate the effects of venture capital (VC) investment on the performance of P2P lending platforms. Specifically, we identify a short-term signaling effect and a long-term governance effect of VC investment on platform performance in terms of transaction volume, and numbers of lenders and borrowers. However, we only find a decrease in average interest rates after venture capitalists’ (VCs’) entry in the long run. Moreover, we verify both the effects of investment from listed VCs, but no signaling effect and a weak governance effect of investment from non-listed VCs. Our analysis provides new insights into how VC investment improves the performance of target firms.
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MAO SHEN,CHENGLIN WU,WENPING JIA,CHENGHONG LI,ZHILI ZHANG,YANGMIN JIN,GUODONG FAN,CAIPING LIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.7
Mesostructured chitosan-coated Fe 3 O 4 nanoparticles (CS-coated Fe 3 O 4 NPs) were synthesizedby a facile one-step solvothermal method via using chitosan as a surface-modi¯cation agent. Subsequently, the surfaces of CS-coated Fe 3 O 4 NPs were successfully conjugated with folic acid(FA) molecules to obtain FA – CS-coated Fe 3 O 4 NPs for improving targeted drug delivery. Themorphology, chemical component and magnetic property of as-prepared composite nanoparticleswere characterized by Fourier transform infrared spectroscopy (FTIR), X-ray di®raction (XRD),dynamic light scattering (DLS), scanning transmission electron microscopy (SEM), transmissionelectron microscopy (TEM), thermal gravimetric analysis (TGA) and vibrating sample magne-tometer (VSM). Furthermore, doxorubicin hydrochloride (DOX) as a model drug was encap-sulated for investigating drug release pattern in vitro. The results show that the magnetizationsaturation value of FA – CS-coated Fe 3 O 4 NPs was about 28.5 emu/g, exhibiting super-paramagnetic properties and mesostructure. DOX could be loaded to FA – CS-coated Fe 3 O 4 NPswith high capacity about 27.9%, and the release rate of DOX could be adjusted by the pH value. This work demonstrates that the prepared magnetic nanoparticles have potential applications inthe treatment of cancer as targeting drug delivery carriers.
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Visualization of Peripheral Pulmonary Artery Red Thrombi Utilizing Optical Coherence Tomography
Cheng Hong,Wei Wang,Nan-shan Zhong,Guang-qiao Zeng,Nuo-fu Zhang 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.5
Optical coherence tomography (OCT) is a new imaging technique capable of obtaining high-resolution intravascular images and has been used in interventional cardiology. However, an application of OCT in pulmonary arteries had seldom been documented. In this case, OCT imaging is performed in peripheral pulmonary arteries and shows mural red thrombi. Subsequently, the red thrombi are aspirated and confirmed by a histological examination. These findings suggest that OCT may be a useful tool to depict peripheral pulmonary artery thrombi.
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