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Particle Filter Guided by Iterated Extended Kalman Filter
Junyi Zuo,Yingna Jia 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In particle filter (PF), the resampling step effectively solves the problem of particle degeneracy. However, it introduces the new problem of particle impoverishment. To tackle this problem, a PF Guided by the Iterated Extended Kalman filter (IEGPF) is proposed. Firstly, a maximum likelihood ratio (MLR) is defined to measure how well the particles, drawn from the transition prior density, match the likelihood model. Then, according to the MLR, particles are adaptively divided into two groups. Those in one group are drawn from the transition prior density, while those in the other group are drawn from the Gaussian approximate posterior density, obtained by the iterated extended Kalman filter (IEKF). Compared with traditional sampling strategies, the proposed strategy is more flexible for time-varying system characteristics, e.g., measurement noise variance. Simulation results demonstrate the improved performance of IEGPF over the Sampling Importance Resampling (SIR) PF, the Extended Kalman PF (EPF) and the Unscented Kalman PF (UPF), etc.
An active set SQP-filter method for solving nonlinear programming
Ke Su,Yingna Yuan,Hui An 영남수학회 2012 East Asian mathematical journal Vol.28 No.3
Sequential quadratic programming (SQP) has been one of the most important methods for solving nonlinear constrained optimiza- tion problems. Recently, filter method, proposed by Fletcher and Leyffer, has been extensively applied for its promising numerical results. In this paper, we present and study an active set SQP-filter algorithm for in- equality constrained optimization. The active set technique reduces the size of quadratic programming (QP) subproblem. While by the filter method, there is no penalty parameter estimate. Moreover, Maratos ef- fect can be overcome by filter technique. Global convergence property of the proposed algorithm are established under suitable conditions. Some numerical results are reported in this paper.
An Optical Intense 2D Electric Field Sensor Using a Single LiNO 3 Crystal
Yuanying Zhang,Jiahong Zhang,Yingna Li,Hongyi Lei 한국광학회 2022 Current Optics and Photonics Vol.6 No.2
Based on the linear electro-optic (EO) effect of lithium niobite (LiNbO 3 , LN) crystal, an intense twodimensional (2D) electric field sensor was analyzed, fabricated and experimentally demonstrated. The linear polarized light beam transmits along the optical axis (z-axis) of the LN crystal, and the polarization direction of the polarized light is 45° to the y-axis. The sensor can detect the intensity of a 2D electric field that is perpendicular to the z-axis. Experimental results demonstrated that the minimum detectable electric field of the sensor is 10.5 kV/m. The maximum detected electric field of the sensor is larger than 178.9 kV/m. The sensitivity of the sensor is 0.444 mV/(kV·m −1 ). The variation of the sensitivity is within ±0.16 dB when the sensor is rotated around a z-axis from 0° to 360°. The variation of the sensoroutput optical power is within ±1.4 dB during temperature change from 19 ℃ to 26 ℃ in a day (from 7:00 AM to 23:00 PM) and temperature change from 0 ℃ to 40 ℃ in a controllable temperature chamber. All theoretical and experimental results revealed that the fabricated sensor provides technology for the direct detection of intense 2D electric fields.
AN ACTIVE SET SQP-FILTER METHOD FOR SOLVING NONLINEAR PROGRAMMING
Su, Ke,Yuan, Yingna,An, Hui The Youngnam Mathematical Society 2012 East Asian mathematical journal Vol.28 No.3
Sequential quadratic programming (SQP) has been one of the most important methods for solving nonlinear constrained optimization problems. Recently, filter method, proposed by Fletcher and Leyffer, has been extensively applied for its promising numerical results. In this paper, we present and study an active set SQP-filter algorithm for inequality constrained optimization. The active set technique reduces the size of quadratic programming (QP) subproblem. While by the filter method, there is no penalty parameter estimate. Moreover, Maratos effect can be overcome by filter technique. Global convergence property of the proposed algorithm are established under suitable conditions. Some numerical results are reported in this paper.
Zhang, Jiahong,Zhu, Chuyi,Yang, Xiumei,Li, Yingna,Zhao, Zhengang,Li, Chuan Optical Society of Korea 2018 Current Optics and Photonics Vol.2 No.6
A new approach for identification of a microwave frequency using an integrated optical waveguide chip, combined with a phase modulator (PM) and two microring resonators (MRRs), is proposed, theoretically deduced, and verified. By wavelength tuning to set the PM under the condition of a double side band (DSB), the measurement range can be started from the dc component, and the measurement range and response slope can be adjusted by designing the radius and transmission coefficient of the MRR. Simulations reveal that the amplitude comparison function (ACF) has a monotonic relationship from dc to 32.5 GHz, with a response slope of 5.15 dB under conditions of DSB modulation, when the radius values, transmission coefficients, and the loss factors are designed respectively as $R_1=400{\mu}m$, $R_2=600{\mu}m$, $t_1=t_2=0.63$, and ${\gamma}_1={\gamma}_2=0.66$. Theoretical calculations and simulation results both indicate that this new approach has the potential to be used for measuring microwave frequencies, with the advantages of compact structure and superior reconfigurability.
Microstructure-modified proton exchange membranes for high-performance direct methanol fuel cells
Wang, Manxiang,Liu, Guicheng,Tian, Zhe,Shao, Yingna,Wang, Lei,Ye, Feng,Tran, Minh Xuan,Yun, Yanbin,Lee, Joong Kee Elsevier 2017 Energy conversion and management Vol.148 No.-
<P><B>Abstract</B></P> <P>To lower methanol crossover and volume swelling degree, and to improve proton conductivity, a simple hot-mould-modifying method has been introduced to modify Nafion membrane for the direct methanol fuel cell application. To evaluate effect of the modification on properties of the Nafion membrane and fuel cell performance, a series of measurements of membranes and fuel cells have been carried out. The results show that, compared with the normal membrane, the modified Nafion membrane with regular spindle-type groove array possesses higher proton conductivity and methanol diffusion resistance, and 31.9% better dimensional stability, owing to its larger electrical double-layer capacitance come from the higher contact area between electron-electrode and ion electrolyte, and its more compact internal structure. And also, the direct methanol fuel cell based on the modified Nafion membrane shows 13.3% higher discharge power density and better long-time running performance than the normal one. Furthermore, this hot-mould-modifying method could be introduced into doping/coating-modified membranes reported in the current literature to further modify Nafion membranes, because this method is compatible with the current modifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple hot-mould-modified Nafion membrane is used for direct methanol fuel cells. </LI> <LI> Regular spindle-type groove array is uniformly distributed on the membrane surface. </LI> <LI> Modification lowers methanol crossover, swelling, and improves proton conductivity. </LI> <LI> Power density and long-time running performance of fuel cells are improved visibly. </LI> <LI> This method provides a practicable way for direct methanol fuel cell applications. </LI> </UL> </P>
Xiaoxiao Shan,Yaoqi Zhang,Zhigang Zhang,Miaorui Chen,Yongyu Su,Yingna Yuan,M. Jahangir Alam,He Yan,Lei Shi 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.1
The purpose of this study was to develop a real-time quantitative loop-mediated isothermal amplication (LAMP) method for the rapid, sensitive, and convenient detection of Listeria monocytogenes in food. The LAMP method could amplify the hlyA gene of L. monocytogenes successfully at 63oC with a loopamp real-time turbidimeter. The detection limits of the LAMP for hlyA gene were 6colony forming units (CFU)/tube. A standard curve was generated for L. monocytogenes LAMP by plotting the graph based different log CFU values of L. monocytogenes and time of positivity through real-time monitoring of the amplication. Then, the LAMP method was employed to test 94 retail food samples effectively. Sensitivity in detection of L. monocytogenes by the LAMP was higher than that of PCR and none of the conventional methodpositive samples was missed by the LAMP method.