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Qiong Gao,Meng-Gang Yang,Jian-Dong Qiao 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.5
The traditional design procedure of a prestressed concrete (PC) cable-stayed bridge is complex and time-consuming. The designers have to repeatedly modify the configuration of the large number of design parameters to obtain a feasible design scheme which maybe not an economical design. In order to efficiently achieve an optimum design for PC cable-stayed bridges, a multi-parameter optimization technique is proposed. In this optimization technique, the number of prestressing tendons in girder is firstly set as one of design variables, as well as cable forces, cable areas and cross-section sizes of the girders and the towers. The stress and displacement constraints are simultaneously utilized to ensure the safety and serviceability of the structure. The target is to obtain the minimum cost design for a PC cable-stayed bridge. Finally, this optimization technique is carried out by a developed PC cable-stayed bridge optimization program involving the interaction of the parameterized automatically modeling program, the finite element structural analysis program and the optimization algorithm. A low-pylon PC cable-stayed bridge is selected as the example to test the proposed optimization technique. The optimum result verifies the capability and efficiency of the optimization technique, and the significance to optimize the number of prestressing tendons in the girder. The optimum design scheme obtained by the application can achieve a 24.03% reduction in cost, compared with the initial design.
상수처리 : 초음파를 이용한 페놀의 분해에 오존의 초기 농도의 영향에 대한 연구
고경원 ( Qiong Yuan Gao ),임명희 ( Myung Hee Lim ),손영규 ( Young Gyu Son ),김지형 ( Jee Hyeong Khim ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-
In this research, the combination of sonolysis and ozonolysis on degradation of phenol as an advanced oxidation process was investigated. Experiments were performed with a probe type ultrasonic system at frequency of 20kHz and power of 225W. Ozone was pre-saturated in distilled water by an ozone generator with different initial ozone concentrations (20mg/L, 39.1mg/L, 60.4mg/L). Compared to linear combination of US and O3, increments of approximately 1.8% and 9.7% of phenol reduction were observed under the US/O3 combination process. Besides, the reaction rate constants of US/O3 seemed to rise with increasing initial concentrations of aqueous ozone. From the kinetic study, the degradation was found to follow the pseudo-first-order kinetic law. And in each case with individual initial ozone concentration, the reaction rate constant of combined system was higher than that of the numeric addition of US and O3 separate system. So the addition of sonolysis had proved to have a synergetic effect on the degradation of phenol with ozonation alone. Both the direct reaction of phenol by O3 and reaction of phenol by hydroxyl radical were supposed to be the main mechanism in this combination process. In addition, an increase of the applied ozone dosage should increase ozone concentration in the liquid phase. At higher ozone concentration, the ozonation time to reach the same efficiency of total phenol removal was smaller than in the case of lower ozone concentration.
New Triterpenoids from the Fruits of Schisandra wilsoniana and Their Biological Activities
Gao, Xue-Mei,Li, Yun-Qi,Shu, Li-Dan,Shen, Yan-Qiong,Yang, Li-Ying,Yang, Liu-Meng,Zheng, Yong-Tang,Sun, Han-Dong,Xiao, Wei-Lie,Hu, Qiu-Fen Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
Investigation of an organic extract of the fruits Schisandra wilsoniana led to the isolation of two new highly oxygenated nortriterpenoids, named schilancidilactones V-W (1-2). Their structures were elucidated by spectroscopic evidence. Compounds 1-2 feature a double bond between C-7 and C-8 compared with related known nortriterpenoids isolated from the genus Schisandra. Compounds 1 and 2 were tested for their anti-HIV-1 activities and cytotoxicity. The results revealed that compounds 1 and 2 showed moderate anti-HIV-1 activities with $EC_{50}$ 3.05 and 2.87 ${\mu}g/mL$, respectively, and compound 1 showed high cytotoxicity against KB and MDA-MB-231 cell with $IC_{50}$ values of 3.18 and 5.22 ${\mu}M$, respectively.
Jiangtao Xu,Qiong Zhang,Zhaoxin Li,Yuhang Gao,Zhiyu Pang,Yina Wu,Geng Li,Dongyong Lu,Lijuan Zhang,Detang Li 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.1
Allergic rhinitis (AR) is an IgE-mediated chronic inflammatory disease of the allergic nasal mucosa. It has a significant effect on quality life; most patients with AR also suffer from sleep disorders, mood disorders, and deterioration in social relationships. As increasing numbers of medicinal plants show productive anti-inflammatory activity against inflammatory diseases, there is growing interest in natural medicinal plant ingredients. To this end, we selected Astragalus polysaccharides (APS) to evaluate its anti-inflammatory effect on ovalbumin-induced AR rats, and we further explored its impact on NLRP3 inflammasome activation and NOD2-mediated NF-κB activation. We found that APS can alleviate the nasal symptom of AR rats and attenuate pathological alterations. APS also reduced the inflammatory cytokine levels. APS not only inhibited the NLRP3 inflammasome activation but also inhibited NF-κB activation by decreasing NOD2 expression and blocking the phosphorylation of NF-κB (p65). In conclusion, APS can effectively improve the inflammatory symptoms of nasal mucosa in AR rats, which may be mediated by the inhibition of NLRP3 inflammasome activation and NOD2-mediated NF-κB activation. These findings indicate that APS has the potential to be used as a therapeutic agent for AR.
Depth-enhanced integral imaging system based on spatial filtering
Yan Xing,Qiong-Hua Wang,Cheng-Gao Luo,Huan Deng,Da-Hai Li 한국정보디스플레이학회 2015 Journal of information display Vol.16 No.2
An integral imaging system enabling an enhanced depth of field is proposed based on spatial filtering. In the proposed system, spatial filtering is used on each elemental image to obtain a depth-enhanced elemental image in the pickup stage, and the obtained elemental images are composed to form an elemental image array for the computational reconstruction in the display stage. A preliminary experiment was carried out, and the experiment results verified the feasibility of the system.
Simulation Studies on the Structural Stability and Properties of Beta Uranium
Yan-Rong Gong,Tao Gao,Guang-Ai Sun,Ben-Qiong Liu,Bo Chen 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.2
The structural stability of beta uranium (-U) is investigated by using the projector augmentedwave (PAW) method based on the density function theory (DFT). Optimized lattice parameters arein agreement with other available data. Especially, the energy per atom and the phonon propertiesmanifest that the model described by using space group No. 102 can be stabilized vibrationallyand energetically. A reasonable agreement with the experimental data for the phonon entropycorresponding to the proper structure has been successfully achieved. Moreover, the thermodynamicfunctions are predicated at elevated temperatures.
He-chuan Song,Yi-du Zhang,Qiong Wu,Han-jun Gao 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
The 3-2-1 constraint principle has been widely applied as the boundary conditions for the finite element method (FEM) to simulate machining deformation of aerospace structure components. However, this principle is inconsistent with the actual contact surface between workpieces and worktables because it provides only three constraint points. These points have rarely been studied in terms of positions and distances. In addition, the applicability of the principle is limited for the workpiece with geometric centers difficult to find or centers without nodes. Therefore, this study proposed a new boundary condition method, low-stiffness spring element constraint method (SECM), drawing on FEM theories and related mechanic theories. With the method proposed this study established the FE model of machining deformation, and then compared the simulation results with both the analytical results and the experimental results of milling and deformation measurements. Good agreement is found between the three results. Finally, this study examined the effect of the three constraint points on simulation of the 3-2-1 principle in terms of point positions and distances. A comparison between SECM and the 3-2-1 principle revealed that SECM is closer to the actual working conditions and more reliable with wider application, which suggests that SECM can replace the 3-2-1 principle as the boundary conditions for the workpiece.