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- 저자 : Dongliang Jiang (검색결과 5 건)
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Calcium phosphate with well controlled nanostructure for tissue engineering
Dongliang Jiang,Jingxian Zhang 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Calcium phosphates comprise a large family of compounds with important biological applications, including osteologic implant coatings, grafts, scaffolds and bone cavity fillings, and vehicles for drug, protein and gene delivery, due to its similarity with the mineral constituents of human bones and teeth. Properties of calcium phosphate, including bioactivity, biocompatibility, solubility, mechanical properties and absorption can be tailored over wide ranges by controlling the particle composition, size, morphology and assembly. For these reasons, it is of great importance to develop synthesis methods focused on the precise control of particle size, morphology, and chemical composition. Herein, we present our approaches related with calcium phosphate with careful size and structural control through template guided process. First, HA nanorods were prepared through hydrothermal method. Phosphate ester was used as the structure directing agent. After hydrothermal treatment, calcium phosphate rods were obtained with well controlled particle size and porosity. Second, sodium salt carboxymethyl cellulose (CMC) was used as the template to guide the formation and assembly of HA nanoparticles. The composites contain nanosized hydroxyapatite with structural features close to those of biological apatites. These composites with special structural features might be attractive for bone tissue engineering applications. Calcium phosphates comprise a large family of compounds with important biological applications, including osteologic implant coatings, grafts, scaffolds and bone cavity fillings, and vehicles for drug, protein and gene delivery, due to its similarity with the mineral constituents of human bones and teeth. Properties of calcium phosphate, including bioactivity, biocompatibility, solubility, mechanical properties and absorption can be tailored over wide ranges by controlling the particle composition, size, morphology and assembly. For these reasons, it is of great importance to develop synthesis methods focused on the precise control of particle size, morphology, and chemical composition. Herein, we present our approaches related with calcium phosphate with careful size and structural control through template guided process. First, HA nanorods were prepared through hydrothermal method. Phosphate ester was used as the structure directing agent. After hydrothermal treatment, calcium phosphate rods were obtained with well controlled particle size and porosity. Second, sodium salt carboxymethyl cellulose (CMC) was used as the template to guide the formation and assembly of HA nanoparticles. The composites contain nanosized hydroxyapatite with structural features close to those of biological apatites. These composites with special structural features might be attractive for bone tissue engineering applications.
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Sketch-based 3D modeling by aligning outlines of an image
Li, Chunxiao,Lee, Hyowon,Zhang, Dongliang,Jiang, Hao Society for Computational Design and Engineering 2016 Journal of computational design and engineering Vol.3 No.3
In this paper we present an efficient technique for sketch-based 3D modeling using automatically extracted image features. Creating a 3D model often requires a drawing of irregular shapes composed of curved lines as a starting point but it is difficult to hand-draw such lines without introducing awkward bumps and edges along the lines. We propose an automatic alignment of a user's hand-drawn sketch lines to the contour lines of an image, facilitating a considerable level of ease with which the user can carelessly continue sketching while the system intelligently snaps the sketch lines to a background image contour, no longer requiring the strenuous effort and stress of trying to make a perfect line during the modeling task. This interactive technique seamlessly combines the efficiency and perception of the human user with the accuracy of computational power, applied to the domain of 3D modeling where the utmost precision of on-screen drawing has been one of the hurdles of the task hitherto considered a job requiring a highly skilled and careful manipulation by the user. We provide several examples to demonstrate the accuracy and efficiency of the method with which complex shapes were achieved easily and quickly in the interactive outline drawing task.
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Bend Deformation Behavior of Silicon Carbide Reticulated Porous Ceramics
Zhu Xinwen,Sakka Yoshio,Tan Shouhong,Jiang Dongliang 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The deformation behavior under three-point bend test was found to depend on the loading uniformity and the macrostructure for SiC reticulated porous ceramics (RPCs). However, this dependence of loading uniformity is alleviated by improved macrostructure with fewer flaws and clogged pores. Even, this dependence becomes less important as the struts become thicker and stronger. The bend result of RPCs with highly uniform macrostructure is in excellent agreement with the GA (Gibson and Ashby) model, but the one with un-uniform macrostructure deviates from the GA model, suggesting that the macrostructure plays an important role in deformation behavior of RPCs under bend.
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Enhanced Strength-Ductility Synergy in Mg-0.5 wt%Ce Alloy by hot Extrusion
Hui Yu,Yu Liu,Ya Liu,Dongliang Wang,Yuling Xu,Binan Jiang,Weili Cheng,Lixin Huang,Weineng Tang,Wei Yu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
The microstructure and mechanical properties of micro-alloyed Mg-0.5 wt%Ce alloys are investigated systemically in this study. It shows that Mg-Ce binary system is very sensitive to extrusion temperature. On the one hand, the high tensile yield strength (TYS) of 343 MPa was obtained by extrusion at 250 °C mainly due to the combined effects of profuse nano-precipitation phase, grain refinement, texture strengthening and high-density dislocation; On the other hand, the excellent elongation of 30% was acquired by extrusion at 300 °C resulting from the elimination of dislocations as well as the modification of texture.
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An Efficient Markov Chain Based Channel Model for 6G Enabled Massive Internet of Things
( Wei Yang ),( Xiaojun Jing ),( Hai Huang ),( Chunsheng Zhu ),( Qiaojie Jiang ),( Dongliang Xie ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.11
Accelerated by the Internet of Things (IoT), the need for further technical innovations and developments within wireless communications beyond the fifth generation (B5G) networks is up-and-coming in the past few years. High altitude platform station (HAPS) communication is expected to achieve such high levels that, with high data transfer rates and low latency, millions of devices and applications can work seamlessly. The HAPS has emerged as an indispensable component of next-generations of wireless networks, which will therefore play an important role in promoting massive IoT interconnectivity with 6G. The performance of communication and key technology mainly depend on the characteristic of channel, thus we propose an efficient Markov chain based channel model, then analyze the HAPS communication system's uplink capability and swing effect through experiments. According to the simulation results, the efficacy of the proposed scheme is proven to meet the requirements of ubiquitous connectivity in future IoT enabled by 6G.
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