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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 Zhang,Zhongsheng Tan,Minjie Jin 대한토목학회 2015 KSCE Journal of Civil Engineering Vol.19 No.3
By taking the 32.645-kilometer-long Guanjiao tunnel of Qinghai-Tibet railway as the object of research, the technology of disasterprevention and rescue in the high-altitude super-long railway tunnel was studied. Combined methods of fire model test and numericalsimulation, combustion characteristics in the high-altitude super-long railway tunnel were discussed, and the Available SafetyEvacuation Time (ASET) was obtained. From the viewpoint of people's safety evacuation, software called STEPS was used toestablish the personnel evacuation model aimed to simulate the process of the personnel evacuation and analyze the evacuation timeunder different fire scenes at the emergency station. Setting schemes of the emergency station and the cross-passage of Guanjiaosuper-long railway tunnel were determined preliminarily, and it also provided a basis for optimizing the design of safety evacuationfacilities of the super-long railway tunnel.
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.
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.
Nian Shan,정훈,안지영,김지훈,김수형 한국물리학회 2018 Current Applied Physics Vol.18 No.6
Membrane electrode assembly (MEA) in proton-exchange membrane fuel cells (PEMFCs) have been fabricated using electrospray-assisted deposition of platinum-carbon composites on carbon-fiber-based paper substrate, because the technique is versatile, operated in atmospheric pressure, and easy to scale up for commercialization. In this study, we investigate the effects of electrospray-assisted platinum loadings from 0.1 to 0.5 mg cm−2 on the electrochemical performance of PEMFCs. The PEMFCs with platinum loading of 0.3 mg cm−2 generate the highest power density, which is ∼35% higher than that of PEMFCs fabricated by traditional brush-deposited catalyst layers. Relatively high platinum loading (>0.3 mg cm−2) enhances the pressure drop in MEA; therefore, the resulting power density is decreased due to low-reacting gas permeability. We also examine the effect of porous structures on the electrochemical performance of PEMFCs. Brij 58-based surfactant templates create micro- and nano-porous structures in the platinum-carbon composite thin layers via thermal removal. These porous structures in the platinum-carbon composite thin layers increase the reacting gas permeability and simultaneously lower the cell resistance, significantly enhancing the electrochemical performance of PEMFCs with porous structures.
Nian Liu,Guodong Zhang,Yadong Xiao,Zhifang Peng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
Different metal oxide nanostructures including SnO2 nanowires, SnO2 nanoparticles, ZnO nanorods, ZnO nanoparticles, Al2O3 nanoparticles, SiO2 nanoarray, and SnO2–SiO2 core–shell nanoparticles, can be selectively synthesized by Self-propagating High-temperature Synthesis (SHS) method with different reaction systems. This method can be easily applied to synthesize metal oxide nanostructures with high yield and excellent purity from low melting point metals in a very short time at low cost without the need for any sophisticated equipment. The composition of reaction system has a crucial influence on the reaction temperature and morphology of the end products. Compared with nanoparticles, nanowires or nanorods can be obtained at lower reaction temperature. And introducing the chemical containing silicon to the reaction system allows the formation of SiO2 nanoarray and SnO2–SiO2 core–shell nanoparticles.
A unified solution for vibration analysis of plates with general structural stress distributions
Nian Yang,Lu-Yun Chen,Hong Yi,Yong Liu 대한조선학회 2016 International Journal of Naval Architecture and Oc Vol.8 No.6
Complex stress distributions often exist in ocean engineering structures. This stress influences structural vibrations. Finite Element Methods exhibit some shortcomings for solving non-uniform stress problems, such as an unclear physical interpretation, complicated operation, and large number of computations. Analytical methods research considers mainly uniform stress problems, and often, their methods cannot be applied in practical marine structures with non-uniform stress. In this paper, an analytical method is proposed to solve the vibration of plates with general stress distributions. Non-uniform stress is expressed as a special series, and the stress influence is inserted into a vibration equation that is solved through decoupling to obtain an analytical solution. This method has been verified using numerical examples and can be used in arbitrary stress distribution cases. This method requires fewer computations and it provides a clearer physical interpretation, so it has advantages in some qualitative research.