A Novel Algorithm of Joint Probability Data Association Based on Loss Function

( Hao Jiao ),( Yunxue Liu ),( Hui Yu ),( Ke Li ),( Feiyuan Long ),( Yingjie Cui ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.7

In this paper, a joint probabilistic data association algorithm based on loss function (LJPDA) is proposed so that the computation load and accuracy of the multi-target tracking algorithm can be guaranteed simultaneously. Firstly, data association is divided in to three cases based on the relationship among validation gates and the number of measurements in the overlapping area for validation gates. Also the contribution coefficient is employed for evaluating the contribution of a measurement to a target, and the loss function, which reflects the cost of the new proposed data association algorithm, is defined. Moreover, the equation set of optimal contribution coefficient is given by minimizing the loss function, and the optimal contribution coefficient can be attained by using the Newton-Raphson method. In this way, the weighted value of each target can be achieved, and the data association among measurements and tracks can be realized. Finally, we compare performances of LJPDA proposed and joint probabilistic data association (JPDA) algorithm via numerical simulations, and much attention is paid on real-time performance and estimation error. Theoretical analysis and experimental results reveal that the LJPDA algorithm proposed exhibits small estimation error and low computation complexity.

A new species of gall midge (Diptera: Cecidomyiidae) damaging flower buds of goji berry Lycium barbarum (Solanaceae)

Ke-Long Jiao,Xiao-Yi Zhou,Hai-Li Qiao,Hao Wang,Jun Chen,Bai-Ming Liu,Wen-Jun Bu,Peter Kolesik 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4

Larvae of a previously undescribed gall midge species have been feeding within malformed flower buds of goji berry Lycium barbarum L. (Solanaceae) in China, preventing fruit development and causing damage to the fruit industry. The new species is named Gephyraulus lycantha Jiao & Kolesik, its morphology is described, the COI mitochondrial gene segment is sequenced, and the biology is outlined. In order to taxonomically accommodate the new gall midge, the scope of the genus Gephyraulus is broadened and now encompasses also species that lack dorso-apical sensoria on the female cercus.

Layout Optimization of Stiffeners in Heavy-Duty Thin-Plate Box Grider

Hao Zhang,Yixiao Qin,Jinpeng Gu,Haibiao Gao,Qianqian Jiao,Feng Wang,Zhenshan Guo,Yangyang Zhang,Chenghong Mi 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.8

The optimization of layout and sizes of the stiffeners in heavy-duty box girder could make this kind of the structure more compact and reasonable, which has certain engineering values. In this study, on the basis of the establishment of parametric finite element model, the function approaching method and gradient search method are combined to form a high-precision optimization algorithm, which makes structural analysis be integrated into the optimization process. The optimization takes the type and location of longitudinal stiffening ribs and the thickness and hole position of transverse diaphragms as design variables, the box girder structural behaviors as constraint conditions, and the total volume as objective function. Finally, the weight is reduced by nearly 7%. More importantly, the new asymmetrical layout of the stiffeners is obtained, the distance between the longitudinal stiffening ribs on the main web and the neutral layer is longer than the distance between the longitudinal stiffening ribs on the secondary web and the neutral layer, and the hole position of transverse diaphragms is close to the secondary web. Compared with the current production of symmetrical layout structure, this layout provides a new idea for the design of stiffeners in the bias-rail box girder.

Optimization of Nutrients for Dinactin Production by a Marine Streptomyces sp. from the High Latitude Arctic

Jiao Zhou,Hao He,Xiaolong Wang,Jian Lu,Xiangshan Zhou,Menghao Cai,YuanXingZhang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.4

Streptomyces sp. R-527F, which produces the macrotetrolide antibiotic dinactin, was isolated from the sediments of the Arctic Ocean. In this work, optimization of the nutrients required for dinactin production including medium development and precursor stimulation, were investigated. Optimization of the medium and replacement of polar sea water were achieved using a one factor at a time experiment in conjunction with statistical analysis using methods covering Plackett–Burman design, the steepest descent method and central composite design. Dinactin production in the optimized medium was 160.8 mg/L, which was 47 fold higher than the control. Supplementation of the fermentation with exogenous acetate (1.5 mmol/L), succinate (6 mmol/L), malonate (24 mmol/L) and citrate (6 mmol/L) further enhanced dinactin biosynthesis by 42.7, 122.3, 66.7, and 62.1%, respectively. The precursors, in particular succinate, facilitated sugar use and also increased pH levels. Furthermore, a six-pulse feeding of total 6 mmol/L succinate in a 5 L bioreactor fermentation yielded a maximal production of 279.0 mg/L dinactin, 124.1% higher than that without precursor stimulation. This nutritional regulation process is easy to scale up and holds the potential for adaptation to industrial use. Keywords: arctic actinomycete, fermentation, dinactin

Optimal design of EMI filters for PV system based on parasitic parameter and stability analysis

Jiao Zhang,Wenjie Chen,Bin Zhang,Xiaomei Song,Hao Huang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

Electromagnetic magnetic interference (EMI) issue has become one of the urgent problems to be solved in the photovoltaic (PV) inverter system. Therefore, it should not be ignored. In order to optimize the EMI filter design, high frequency characteristic of a PV system is studied in this paper. A conducted EMI model is proposed. The proposed model take into consider the influences of PV array parameters, DC side cable impedance, inverter parasitic capacitance and the unbalance of AC side impedance. Based upon that model, a passive EMI filter used for the DC side of a PV system is designed and fabricated. And the designing steps have been given thoroughly. To acquire the best performance of the filter, a stabilization analysis based on Routh criterion is also made. Finally, experimental results are presented to verify the efficient of the proposed EMI filter.

The Effects of Puerarin on CYP2D6 and CYP1A2 Activities In Vivo

Jiao Zheng,Bin Chen,Bing Jiang,Ling Zeng,Zhi-Rong Tang,Lan Fan,Hong-Hao Zhou 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.2

Ge-gen (Radix Puerariae) is used in traditional oriental medicine for various medicinal purposes. The drug is the root of a wild leguminous creeper, Pueraria lobata (Willd) Ohwi. It possesses a high content of avonoid derivatives, the most abundant of which is puerarin. Our goal was to find the effect of puerarin on cytochrome P450 enzymes in vivo. The study was conducted in 18 male volunteers of different genotypes (CYP2D6 *1/*1, *1/*10, *10/*10). Plasma was obtained at 6 h after oral administration and urine was collected from 0 to 8 h after probe drug administration. The logarithm value of metabolic rate decrease from -0.0055 ± 0.1887 to -0.1754 ± 0.2411 implied puerarin inhibited activity of CYP2D6. There was no significant relationship between the inhibition with the CYP2D6 genotypes. The paraxanthin/caffeine ratio in the plasma sample at 6th hour was increased by 30 ± 47% (p = 0.003), implied puerarin induced the activity of CYP1A2. While puerarin used together with the substrates of both enzymes, drug interaction worth the attention and at sometimes precautions are needed.

Progress in Preparation of Cellulase from Lignocellulose Using Fungi

Hui Jiao,Xiang-Yang Song,Chenhuan Lai,Hao Fang,Yuqi Song,Junjun Zhu 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.6

Lignocellulosic biomass such as agricultural and forestry waste is the most abundant renewable organic carbon source on earth and can be used to produce source of clean energy such as ethanol. One of the disadvantages of the preparation of ethanol using lignocellulose as raw material is the high cost of production of cellulase. Fungi are capable of effectively degrading lignocellulose and secreting a large amount of cellulase, and have the advantages of ease of preparation, high yield, and full enzyme systems. Therefore, this paper reviews sources of lignocellulose and the biodegradation properties which limit the production of cellulase, proposes micro-organisms capable of degrading lignocellulose and explains the types of cellulase, and the mechanism of action, methods of fermentation optimization, and control are analyzed, and ways to increase the yield of cellulase are described. Finally, research on the effects of inducers on the production of cellulase by fungi is reviewed. The aims of this review are to provide a reference for the efficient production and industrial application of cellulase.

Numerical simulation of a regenerative thermal oxidizer for volatile organic compounds treatment

Xiaowen Hao,Ruixin Li,Jiao Wang,Xinfei Yang 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.4

As regulations governing the control of volatile organic compounds (VOCs) have become increasingly stringent in China, regenerative thermal oxidizers (RTOs) have been more frequently applied in medium- and high-concentration VOCs treatments. However, due to the lack of existing RTO-related research, experience remains a dominant factor for industrial application. This paper thus aimed to establish a model for industrial RTOs, using a transient simulation method and thermal equilibrium model to simulate the internal velocities and temperature distributions of an RTO across multiple cycles. A comparison showed an error of less than 5% between most correlating simulated and experimental measurement points, verifying that the simulation method was accurate. After verification, the velocity and temperature fields inside the RTO were simulated to study the uniformity of temperature and velocity within the packed beds: both fields displayed high uniformity after gas flowed through the honeycomb regenerator. The effects of air volume, VOCs concentrations, and valve switching times on the oxidation chamber temperature, RTO outlet temperature, and thermal efficiency (as well as their averages) were studied. The VOCs removal rate in this study was constantly above 98%, and the average thermal efficiency reached 90%.

An Improved Result on Stability Analysis of Delayed Load Frequency Control Power Systems

Shiyu Jiao,Jianwei Xia,Zhen Wang,Xiangyong Chen,Jing Wang,Hao Shen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4

This paper investigates the stability of power systems with load frequency control considering time delays(constant and time-varying delays). A new criterion for ensuring the stability of the system is proposed on the basisof Lyapunov stability theory and a further strengthened inequality. Finally, taking a single-area load frequencycontrol scheme with the proportional-integral controller as an example, according to the stability criterion obtained,the relationship between the maximum allowable delay and the gain of proportional-integral controller is discussed. Besides, in case studies, the effectiveness of our method is also demonstrated.

Experimental quantum fast hitting on hexagonal graphs

Tang, Hao,Di Franco, Carlo,Shi, Zi-Yu,He, Tian-Shen,Feng, Zhen,Gao, Jun,Sun, Ke,Li, Zhan-Ming,Jiao, Zhi-Qiang,Wang, Tian-Yu,Kim, M. S.,Jin, Xian-Min Springer Science and Business Media LLC 2018 Nature photonics Vol.12 No.12