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Zhao, Yu,Shi, Chen-Xiao,Kwon, Ki-Chul,Piao, Yan-Ling,Piao, Mei-Lan,Kim, Nam Elsevier 2018 OPTICS COMMUNICATIONS - Vol.411 No.-
<P><B>Abstract</B></P> <P>We propose a fast calculation method for a computer-generated hologram (CGH) of real objects that uses a point cloud gridding method. The depth information of the scene is acquired using a depth camera and the point cloud model is reconstructed virtually. Because each point of the point cloud is distributed precisely to the exact coordinates of each layer, each point of the point cloud can be classified into grids according to its depth. A diffraction calculation is performed on the grids using a fast Fourier transform (FFT) to obtain a CGH. The computational complexity is reduced dramatically in comparison with conventional methods. The feasibility of the proposed method was confirmed by numerical and optical experiments.</P>
Zhao, Yu,Piao, Mei-lan,Li, Gang,Kim, Nam Optical Society of America 2015 Optics letters Vol.40 No.13
<P>Fast calculation method for a computer-generated cylindrical hologram (CGCH) is proposed. The method consists of two steps: the first step is a calculation of a virtual wave-front recording surface (WRS), which is located between the 3D object and CGCH. In the second step, in order to obtain a CGCH, we execute the diffraction calculation based on the fast Fourier transform (FFT) from the WRS to the CGCH, which are in the same concentric arrangement. The computational complexity is dramatically reduced in comparison with direct integration method. The simulation results confirm that our proposed method is able to improve the computational speed of CGCH.</P>
Zhao, Yu,Hong, Misun,Bonnet Mercier, Nadè,ge,Yu, Guihua,Choi, Hee Cheul,Byon, Hye Ryung American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>A lithium–iodine (Li–I<SUB>2</SUB>) cell using the triiodide/iodide (I<SUB>3</SUB><SUP>–</SUP>/I<SUP>–</SUP>) redox couple in an aqueous cathode has superior gravimetric and volumetric energy densities (∼ 330 W h kg<SUP>–1</SUP> and ∼650 W h L<SUP>–1</SUP>, respectively, from saturated I<SUB>2</SUB> in an aqueous cathode) to the reported aqueous Li-ion batteries and aqueous cathode-type batteries, which provides an opportunity to construct cost-effective and high-performance energy storage. To apply this I<SUB>3</SUB><SUP>–</SUP>/I<SUP>–</SUP> aqueous cathode for a portable and compact 3.5 V battery, unlike for grid-scale storage as general target of redox flow batteries, we use a three-dimensional and millimeter thick carbon nanotube current collector for the I<SUB>3</SUB><SUP>–</SUP>/I<SUP>–</SUP> redox reaction, which can shorten the diffusion length of the redox couple and provide rapid electron transport. These endeavors allow the Li–I<SUB>2</SUB> battery to enlarge its specific capacity, cycling retention, and maintain a stable potential, thereby demonstrating a promising candidate for an environmentally benign and reusable portable battery.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl404784d/production/images/medium/nl-2013-04784d_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl404784d'>ACS Electronic Supporting Info</A></P>
Zhao, Yu,Kwon, Ki-Chul,Erdenebat, Munkh-Uchral,Islam, Md-Sifatul,Jeon, Seok-Hee,Kim, Nam The Optical Society 2018 Applied Optics Vol.57 No.15
<P>The calculation of realistic full-color holographic displays is hindered by the high computational cost. Previously, we suggested a point cloud gridding (PCG) method to calculate monochrome holograms of real objects. In this research, a relocated point cloud gridding (R-PCG) method is proposed to enhance the reconstruction quality and accelerate the calculation speed in GPU for a full-color holographic system. We use a depth camera to acquire depth and color information from the real scene then reconstruct the point cloud model virtually. The R-PCG method allows us to classify groups of object points with the same depth values into grids in the red, green, and blue (RGB) channels. Computer-generated holograms (CGHs) are obtained by applying a fast Fourier transform (FFT) diffraction calculation to the grids. The feasibility of the R-PCG method is confirmed by numerical and optical reconstruction. (C) 2018 Optical Society of America</P>
Online voltage phase synchronization in receiving coils of multi-input wireless power transfer
Zhao, Yu,Yang, Shiyou The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11
In multi-input wireless power transfer (WPT) systems, it is plagued to create a destructive interference between the multiple transmitters to result in a relatively low voltage delivered to the receiving coil and load, due to the phase differences of the received voltages from different transmitters. In this regard, it is essential to synchronize the phases of the received voltages of the receiving coil from different transmitters. However, the existing offline synchronization methodologies rely heavily on an analytical form solution of the received voltage in a receiver. In most engineering application scenarios, such close-form solution is almost impossible. Moreover, the close form solution, even if possible, will vary with the operating conditions and environments. To eliminate these deficiencies of existing synchronization methodologies, an online synchronization methodology is proposed for a multi-input WPT system. In the proposed methodology, the received voltages from different transmitters are determined from a series of online voltage samplings under different offset phases, and a synchronization strategy is then proposed and implemented. A multi-input WPT prototype is developed to test the feasibility of the proposed synchronization methodology. The experimental results have demonstrated that the received voltage is significantly enhanced by applying the proposed online phase synchronization methodology.
A PRACTICAL PARTIAL RESONANT CONVERTER WITH CONSTANT FREQUENCY
Zhao Yu,Z.D.Fang 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
A practical zero voltage switched (ZVS) quasi resonant converter (QRC) utilizing "partial resonance" and magnetic amplifier on secondary with constant frequency will be presented.This converter has been well satisfied the wide range of the rating line voltage AC 220V with -30%-+20% in China. Moreover,it has been used in high stable multiple output in wide range of load by employing Mag-Amp In this paper,circuit design and analysis will be described The circuit diagram and experimental result are also given.
Zhaoyu Ren,Wei Zhang,Mengke Wang,Haifeng Gao,Huimin Shen,Chunping Wang,Taiguo Liu,Wanquan Chen,Li Gao 한국식물병리학회 2021 Plant Pathology Journal Vol.37 No.5
Tilletia laevis Kühn (syn. Tilletia foetida (Wallr.) Liro.) causes wheat common bunt, which is one of the most devastating plant diseases in the world. Common bunt can result in a reduction of 80% or even a total loss of wheat production. In this study, the characteristics of T. laevis infection in compatible wheat plants were defined based on the combination of scanning electron mi- croscopy, transmission electron microscopy and laser scanning confocal microscopy. We found T. laevis could lead to the abnormal growth of wheat tissues and cells, such as leakage of chloroplasts, deformities, disordered arrangements of mesophyll cells and also thickening of the cell wall of mesophyll cells in leaf tissue. What’s more, T. laevis teliospores were found in the roots, stems, flag leaves, and glumes of infected wheat plants instead of just in the ovaries, as previously reported. The abnormal characteristics caused by T. laevis may be used for early detection of this pathogen instead of molecular markers in addition to providing theoretical insights into T. laevis and wheat interactions for breed- ing of common bunt resistance.
Artificial Neural Networks-Based Mission Planning Mechanism for Spacecraft
Zhaoyu Li,Rui Xu,Pingyuan Cui,Shengying Zhu 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.1
The ability to plan and react fast in dynamic space environments is central to intelligent behavior of spacecraft. For space and robotic applications, many planners have been used. But it is difficult to encode the domain knowledge and directly use existing techniques such as heuristic to improve the performance of the application systems. Therefore, regarding planning as an advanced control problem, this paper first proposes an autonomous mission planning and action selection mechanism through a multiple layer perceptron neural network approach to select actions in planning process and improve efficiency. To prove the availability and effectiveness, we use autonomous mission planning problems of the spacecraft, which is a sophisticated system with complex subsystems and constraints as an example. Simulation results have shown that artificial neural networks (ANNs) are usable for planning problems. Compared with the existing planning method in EUROPA, the mechanism using ANNs is more efficient and can guarantee stable performance. Therefore, the mechanism proposed in this paper is more suitable for planning problems of spacecraft that require real time and stability.