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Research on Video Analysis and Tracking Technology in Swimming Video
Ni An 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.9
This paper proposes the tracking method for swimmer in the video with Kalman filtering prediction. The Kalman initiates the swimmer with feature such as the location of object and the size of its enclosing rectangle which can be got in the detection proceeding, which are used to predict the feature of the tracked simmer in subsequent frames and ascertain the scope for searching the tracked object. The results of experiments show that this method can be used to provide information for controlling cameras and this can help to track the swimmer in the next frames.
Limonoids from the roots of Trichilia sinensis and their cytotoxicities
Zhu-Nian Wang,Wen-Li Mei,Hui-Qin Chen,Jun Wang,Zhu-Nian Wang,Hao Fu Dai 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.12
Six new compounds (1–4, 8, 10), along with six known limonoids (5–7, 9, 11, 12), were isolated from the roots of Trichilia sinensis. Their structures were elucidated on the basis of extensive spectroscopic methods including 1H NMR, 13C NMR, DEPT, HSQC, HMBC, 1H–1H COSY and ROESY experiments, as well as by comparison with the literature. All the compounds were evaluated for cytotoxicities against K562, SGC-7901 and BEL-7402 cell lines. Compounds 2, 7, 10, 11, and 12 showed weak inhibitory activity to the selected cell lines.
Nian Cheng,Weiwei Li,Menghan Zhang,Hangjuan Wu,Shujie Sun,Zhiqiang Zhao,Zhenyu Xiao,Zhuzhu Sun,Wei Zi,Liang Fang 한국물리학회 2019 Current Applied Physics Vol.19 No.1
Employing additive to regulate the morphology of perovskite film is an effective method to enhance both the power conversion efficiency and long term stability of organic-inorganic hybrid perovskite solar cells. Here, we demonstrate that guanidinium thiocyanate (GuSCN) is a suitable additive for methylammonium lead iodide (MAPbI3) perovskite materials. Addition of GuSCN into MAPbI3 can simultaneously enhance the crystallinity, enlarge the crystal size, and reduce the trap density of the perovskite films. As a result, the MAPbI3 perovskite with 10% GuSCN exhibits superior power conversion efficiency of 16.70% compared to the pristine MAPbI3 perovskite solar cell (15.57%). At the same time, the MAPbI3 perovskite solar cell with GuSCN additive shows better stability, power conversion efficiency retains ∼90% of its initial value compared to only ∼60% for pristine MAPbI3 perovskite solar cells after being stored for 15 days without encapsulation
Flame Braze between Aluminum Alloy 5A06 and Low Carbon Steel Q235
Nian-chun LU,Yang LIU,Guo-dong Hao,Yun-tao WANG 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.4
By means of the flame braze, the welding problems on Aluminum alloy(5A06)and low carbon steel Q235) were mainly researched in this paper. The welding technology adopted in this paper is that a hot-dipped Aluminum coating of ZL102 Aluminum alloy was firstly performed on the surfaces of low carbon steel, then the layer of hot-dipped aluminum and aluminum alloy were welded by the shape of the lap joint. Through the analysis of the microstructure and tensile property of welded joint after the experiment, the experimental results expressed that good welded joint can be attained by application of flame brazing. Fracture location of the joint specimens appears in the coating layer by means of tensile test. The results show that the bond strength of the coating layer was less than that of the brazing seams.
Nian, Heng,Cheng, Chenwen,Song, Yipeng The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
This paper develops a coordinated control strategy of the doubly fed induction generator (DFIG) system based on repetitive control (RC) under generalized harmonic grid voltage conditions. The proposed RC strategy in the rotor side converter (RSC) is capable of ensuring smooth DFIG electromagnetic torque that will enable the possible safe functioning of the mechanical components, such as gear box and bearing. Moreover, the proposed RC strategy in the grid side converter (GSC) aims to achieve sinusoidal overall currents of the DFIG system injected into the network to guarantee satisfactory power quality. The dc-link voltage fluctuation under the proposed control target is theoretically analyzed. Influence of limited converter capacity on the controllable area has also been studied. A laboratory test platform has been constructed, and the experimental results validate the availability of the proposed RC strategy for the DFIG system under generalized harmonic grid voltage conditions.
Effect of seismic acceleration directions on dynamic earth pressures in retaining structures
Nian, Ting-Kai,Liu, Bo,Han, Jie,Huang, Run-Qiu Techno-Press 2014 Geomechanics & engineering Vol.7 No.3
In the conventional design of retaining structures in a seismic zone, seismic inertia forces are commonly assumed to act upwards and towards the wall facing to cause a maximum active thrust or act upwards and towards the backfill to cause a minimum passive resistance. However, under certain circumstances this design approach might underestimate the dynamic active thrust or overestimate the dynamic passive resistance acting on a rigid retaining structure. In this study, a new analytical method for dynamic active and passive forces in c-${\phi}$ soils with an infinite slope was proposed based on the Rankine earth pressure theory and the Mohr-Coulomb yield criterion, to investigate the influence of seismic inertia force directions on the total active and passive forces. Four combinations of seismic acceleration with both vertical (upwards or downwards) and horizontal (towards the wall or backfill) directions, were considered. A series of dimensionless dynamic active and passive force charts were developed to evaluate the key influence factors, such as backfill inclination ${\beta}$, dimensionless cohesion $c/{\gamma}H$, friction angle ${\phi}$, horizontal and vertical seismic coefficients, $k _h$ and $k_v$. A comparative study shows that a combination of downward and towards-the-wall seismic inertia forces causes a maximum active thrust while a combination of upward and towards-the-wall seismic inertia forces causes a minimum passive resistance. This finding is recommended for use in the design of retaining structures in a seismic zone.
Nian-Wu He,,Yan Zhao,Ling Guo,Jun Shang,Xing-Bin Yang 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.4
Dietary and medicinal uses of Panax notoginseng have been associated with reduced risk of cancer. This study was designed to investigate the profiles of P. notoginseng saponin extract (PNSE), the major bioactive ingredients in P. notoginseng (Burk.) F.H. Chen, by high-performance liquid chromatography, and, for the first time, the anticancer effect of PNSE in the human colon cancer cell line LoVo was further evaluated. The major saponins present in PNSE were ginsenosides Rg1 (31.1%) and Rb1 (34.4%), and the total content of the eight saponins identified (notoginsenoside R1, ginsenosides Rg1, Re, Rb1, Rc, and Rd, and isomeric ginsenosides Rb2 and Rb3) was 81.7%, indicating that it was a highly purified standardized saponin extract. Furthermore, PNSE was found to have a markedly cytotoxic effect and antiproliferative activity against the LoVo cell line in a dose- and time-dependent manner. Flow cytometry analysis demonstrated that PNSE caused cell cycle arrest at S phase. Moreover, PNSE was found to possess antioxidative capacities in the 1,1-diphenyl-2-picrylhydrazyl free radical scavenging assay and hydroxyl radical scavenging assay in vitro. Taken together, the present results suggest that naturally occurring PNSE may provide significant natural defense against human colon cancer.
Nian, Rui,Kim, Duck Sang,Tan, Lihan,Kim, Chan-Wha,Choe, Woo-Seok Wiley (John WileySons) 2009 Biotechnology progress Vol.25 No.4
<P>The use of polyethylene glycol (PEG) as a refolding additive to a refolding cocktail comprising the molecular bichaperone ClpB and DnaKJE significantly enhances chaperone-mediated refolding of heat-denatured malate dehydrogenase (MDH). The critical factor to affect the refolding yield is the time point of introducing PEG to the refolding cocktail. The refolding efficiency reached approximately 90% only when PEG was added at the beginning of refolding reaction. The synergistic coordination of an inexpensive refolding additive PEG with the ClpB/DnaKJE bichaperone system may provide an economical route to further enhance the efficacy of ClpB/DnaKJE refolding cocktail approach, facilitating its implementation in large-scale refolding processes.</P>