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RISS 인기검색어
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- 저자 : Jiaming Tian (검색결과 4 건)
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Kang Yuan,Jiaming Zhang,Junlin Guo,Wan Tian 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.4
The seismic capacity of rural buildings is low and effective execution of the traditional seismic measures is difficult. Therefore, a new type of composite isolation system, which is suitable for rural buildings in frozen earth regions, is proposed in this work. The design parameters and dynamic response characteristics of this system under rare earthquakes were investigated via systematic dynamic elastic-plastic time-history analyses performed on four different types of models. These models were established by the finite element software ABAQUS, and a composite isolation structure, sliding isolation structure, sand cushion isolation structure, and traditional masonry structure were considered. Afterward, the seismic response characteristics and design parameters of the composite isolation system were obtained by comparing the dynamic response analysis results (acceleration, displacement, and bottom shearing force) of each model. The best isolation effect was realized for the composite isolation system, where the seismic energy can be effectively absorbed and the impact of frost heaving on buildings can be eliminated. Furthermore, this effect will improve with decreasing friction coefficient of the sliding layer and increasing seismic intensity. Based on the preset isolation rate of 40%, the design values of the friction coefficient were determined to be 0.1–0.35, which are appropriate for high-seismic-intensity regions.
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Tao Zhang,Jiaming Tian,Shu-Ping Ma 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
This paper studies the problem of designing the unknown input observers (UIOs) for fractional order one-sided Lipchitz nonlinear systems. By introducing a continuous frequency distributed equivalent model and using the matrix generalized inverse approach, sufficient conditions for asymptotic stability of the observer error dynamic systems are presented, which guarantee the existence of the full-order and reduced-order UIOs. All the conditions are obtained in terms of linear matrix inequality (LMI). Furthermore, we show that the obtained results can be applied to a fractional order electrical circuit with the unknown input signal. Two examples are given to demonstrate the applicability of the proposed approach.
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Ji Wanqing,Wu Zhiru,Wen Jiaming,Tang Hengxin,Chen Zhuopeng,Xue Bo,Tian Zhenming,Ba Yueyang,Zhang Ning,Wen Xuejun,Hou Bo 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
The brain vascular basement membrane (brain-VBM) is an important component of the brain extracellular matrix, and the three-dimensional structure of the cerebrovascular network nested with many cell-adhesive proteins may provide guidance for brain tissue regeneration. However, the potential of ability of brain-VBM to promote neural tissue regeneration has not been examined due to the technical difficulty of isolating intact brain-VBM.The present study developed a simple, effective method to isolate structurally and compositionally intact brain-VBM. Structural and component properties of the brain-VBM were characterized to confirm the technique. Seed cells were cocultured with brain-VBM in vitro to analyze biocompatibility and neurite extension. An experimental rat model of focal traumatic brain injury (TBI) induced by controlled cortical impact were conducted to further test the tissue regeneration ability of brain-VBM.Brain-VBM isolated using genipin showed significantly improved mechanical properties, was easy to handle, supported high cell viability, exhibited strong cell adhesive properties, and promoted neurite extension and outgrowth. Further testing of the isolated brain-VBM transplanted at lesion sites in an experimental rat model of focal TBI demonstrated considerable promise for reconstructing a complete blood vessel network that filled in the lesion cavity and promoting repopulation of neural progenitor cells and neurons.The technique allows isolation of intact brain-VBM as a 3D microvascular scaffold to support brain tissue regeneration following TBI and shows considerable promise for the production of naturally-derived biomaterials for neural tissue engineering.
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Chuang Bi,Xingyu Wang,Fangfang Tian,Zhe Qu,Jiaming Zhao 대한치과보철학회 2022 The Journal of Advanced Prosthodontics Vol.14 No.4
PURPOSE. The present study compared the accuracy between digital and conventional implant impressions. MATERIALS AND METHODS. The experimental models were divided into six groups depending on the implant location and the scanning span. Digital impressions were captured using the intraoral optical scanner TRIOS (3Shape, Copenhagen, Denmark). Conventional impressions were taken with the monophase impression material based on addition-cured silicones, Honigum-Mono (DMG, Hamburg, Germany). A highprecision laboratory scanner D900 (3Shape, Copenhagen, Denmark) was used to obtain digital data of resin models and stone casts. Surface tessellation language (STL) datasets from scanner were imported into the analysis software Geomagic Qualify 14 (3D Systems, Rock Hill, SC, USA), and scan body deviations were determined through two-dimensional and three-dimensional analyses. Each scan body was measured five times. The Sidak t test was used to analyze the experimental data. RESULTS. Implant position and scanning distance affected the impression accuracy. For a unilateral arch implant and the mandible models with two implants, no significant difference was observed in the accuracy between the digital and conventional implant impressions on scan bodies; however, the corresponding differences for trans-arch implants and mandible with six implants were extremely significant (P <.001). CONCLUSION. For short-span scanning, the accuracy of digital and conventional implant impressions did not differ significantly. For long-span scanning, the precision of digital impressions was significantly inferior to that of the traditional impressions.
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