Direct tracking of noncircular sources for multiple arrays via improved unscented particle filter method

Yang Qian,Xinlei Shi,Haowei Zeng,Mushtaq Ahmad 한국전자통신연구원 2023 ETRI Journal Vol.45 No.3

Direct tracking problem of moving noncircular sources for multiple arrays is investigated in this study. Here, we propose an improved unscented particle filter (I-UPF) direct tracking method, which combines system proportional symmetry unscented particle filter and Markov Chain Monte Carlo (MCMC) algorithm. Noncircular sources can extend the dimension of sources matrix, and the direct tracking accuracy is improved. This method uses multiple arrays to receive sources. Firstly, set up a direct tracking model through consecutive time and Doppler information. Subsequently, based on the improved unscented particle filter algorithm, the proposed tracking model is to improve the direct tracking accuracy and reduce computational complexity. Simulation results show that the proposed improved unscented particle filter algorithm for noncircular sources has enhanced tracking accuracy than Markov Chain Monte Carlo unscented particle filter algorithm, Markov Chain Monte Carlo extended Kalman particle filter, and two-step tracking method.

RANET: A Grasp Generative Residual Attention Network for Robotic Grasping Detection

Qian-Qian Hong,Liang Yang,Bi Zeng 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.12

This paper presents a novel grasp generative residual attention network (RANET) for generating antipodal robotic grasp from multi-modal images with the pixel-wise method. To strengthen the generalization ability of unknown objects, this paper proposed a new structure that differs from the previous grasp generative network in that it additionally integrates a coordinate attention mechanism and a symmetrical skip connection, respectively. Using the coordinate attention module to emphasize meaningful information of the feature map and the symmetrical skip connection to remain more fine-grained details of feature. Moreover, a multi atrous convolution module is included in the structure to capture more high-level information, while a hypercolumn feature fusion method is incorporated for getting the best from the complementation of different layers’ features. Through evaluation on public datasets, the result demonstrates that we achieve 98.9% accuracy on the Cornell dataset which is the state-of-the-art performance with real-time speed(∼ 17 ms), meanwhile, we represent a 93.9% accuracy performance on the Jacquard dataset.

Wireless Powered Asynchronous Backscatter Networks With Sporadic Short Packets: Performance Analysis and Optimization

Yang, Qian,Wang, Hui-Ming,Zheng, Tong-Xing,Han, Zhu,Lee, Moon Ho IEEE 2018 IEEE Internet of things journal Vol.5 No.2

<P>In the fifth generation era, the pervasive applications of Internet of Things and massive machine-type communications have initiated increasing research interests on the backscatter wireless powered communication (B-WPC) technique due to its ultrahigh energy efficiency and low cost. The ubiquitous B-WPC network is characterized by nodes with dynamic spatial positions and sporadic short packets, of which the performance has not been fully investigated. In this paper, we give a comprehensive analysis of a multiantenna B-WPC network with sporadic short packets under a stochastic geometry framework. By exploiting a time-space Poisson point process model, the behavior of the network is well captured in a decentralized and asynchronous transmission way. We then analyze the energy and information outage performance in the energy harvest and backscatter modulation phases of the backscatter network, respectively. The optimal transmission slot length and division are obtained by maximizing the network-wide spatial throughput. Moreover, we find an interesting result that there exists the optimal tradeoff between the durations of the energy harvest and backscatter modulation phases for spatial throughput maximization. Numerical results are demonstrated to verify our analytical findings and show that this tradeoff region gets shrunk when the outage constraints become more stringent.</P>

Upshift of MnBi magnetic properties via process optimizations

Yang Yang,Jong-Woo Kim,Jihoon Park,Hui-Dong Qian,Jung Tae Lim,Oi Lun Li,Chul-Jin Choi 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2

Control of magnetic properties of MnBi by elements doping

Yang Yang,Hui-Dong Qian,Jung Tae Lim,Jihoon Park,Jong-Woo Kim,Chul-Jin Choi 한국자기학회 2020 한국자기학회 학술연구발표회 논문개요집 Vol.30 No.2

NOMA in Downlink SDMA With Limited Feedback: Performance Analysis and Optimization

Qian Yang,Hui-Ming Wang,Ng, Derrick Wing Kwan,Lee, Moon Ho IEEE 2017 IEEE journal on selected areas in communications Vol.35 No.10

<P>In this paper, the performance of non-orthogonal multiple access (NOMA) is investigated and optimized in a downlink space division multiple access network with a multi-antenna base station and randomly deployed users, under a general channel state information (CSI) limited feedback framework. We first propose a dynamic user scheduling and grouping strategy by leveraging limited feedback. Based on that, an analytical framework is proposed to obtain the outage probability of the network in closed form. The diversity order and the impacts of the number of feedback bits on the outage performance of NOMA are analyzed. Furthermore, the net throughput, which captures the network-wide throughput with the uplink feedback cost considered, is maximized by optimizing the number of feedback bits. Numerical results are demonstrated to verify our analytical findings and show that different from the perfect CSI case, there always exists a performance floor of outage probability in the considered network due to limited feedback. Moreover, the optimal number of feedback bits for net throughput maximization increases as the channel coherence time becomes longer.</P>

Immunomodulatory effects of Pseudostellaria heterophylla peptide on spleen lymphocytes via a Ca2+/CaN/NFATc1/IFN-γ pathway

Yang, Qian,Cai, Xixi,Huang, Muchen,Jia, Lee,Wang, Shaoyun Royal Society of Chemistry 2019 Food & Function Vol.10 No.6

<P><I>Pseudostellaria heterophylla</I> has been becoming a popular research topic because of its functionally active components. The immunomodulatory activity of <I>P. heterophylla</I> peptide (PPH) derived from protein hydrolysate and the molecular mechanism underlying its immunomodulatory effect were investigated in this study. Immunomodulatory PPH achieved the highest stimulation index of 1.53 at a concentration of 100 μg mL<SUP>−1</SUP> for 48 h in spleen lymphocytes and promoted the secretions of tumor necrosis factor-α, interferon-γ, and interleukin-10. Moreover, PPH could elevate the intracellular Ca<SUP>2+</SUP> concentration, calcineurin activity and nuclear factor of activated T cell (NFAT) c1 mRNA expression. Meanwhile these effects could be diminished by the treatment of verapamil and cyclosporin A, suggesting that PPH may activate spleen lymphocytes <I>via</I> the Ca<SUP>2+</SUP>/CaN/NFATc1/IFN-γ signaling pathway. These findings demonstrate that the <I>P. heterophylla</I> peptide has the potential to be utilized as a nutraceutical supplement to strengthen the immune system in the human body.</P>

Microstructure and Magnetic Properties of Sn added MnBi Bulk Magnets

Yang Yang,Jung Tae Lim,Jihoon Park,Hui-Dong Qian,Oi Lun Li,Jong-Woo Kim,Chul-Jin Choi 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2

Rare-earth free permanent magnets are current emerging issues of industry for the growing market demands. Among the rare-earth free permanent magnets, MnBi has attracted attention for large magnetocrystalline anisotropy constant (K₁ ≈ 1.6 MJ/m³, at 300 K) and unique positive temperature coefficient of coercivity (Hc). The low-temperature phase (LTP) of MnBi exhibits a saturation magnetization (Ms) of 80 emu/g, and the theoretical maximum energy product (BH)max 17.7 MGOe at room temperature. However, it is a challenge to fabricate MnBi bulk magnets while maintaining the superior magnetic properties of the powder, especially to prevent the reduction of Hc from powder to bulk. The effects of Sn adding on the microstructure and magnetic properties of MnBi bulk magnets have been systematically investigated. As kwon, the pure MnBi bulk magnets are challenging to reach high Hc in previous studies, and a few reference works have been reported about research on fabrication of high Hc MnBi bulks by adding the third element. It was found that the Sn-added MnBi bulk magnets show the increased Hc and the improved squareness, apparently related to restructuring the intergranular phase due to Sn element addition. The Hc of MnBi bulk magnet with 3 wt.% Sn reaches 11.6 kOe, which is 35 % higher than that of the pure MnBi magnet. In the sample of 1 wt.% Sn added MnBi bulk magnet, the Hc was elevated to 10.0 kOe, and the maximum energy product (BH)max was recorded of 7.84 MGOe at room temperature. This makes Sn added MnBi bulk magnet a promising candidate for next-generation rare-earth-free bulk magnets. 〈그림 본문참조〉

Sodium selenite-induced activation of DAPK promotes autophagy in human Leukemia HL60 cells

( Qian Jiang ),( Feng Li ),( Ke Jian Shi ),( Yang Yang ),( Cai Min Xu ) 생화학분자생물학회 (구 한국생화학분자생물학회) 2012 BMB Reports Vol.45 No.3

Autophagy has been suggested as a possible mechanism for non-apoptotic death despite evidence from many species that autophagy represents a survival strategy of cells under stress. From our previous findings that supranutritional doses of sodium selenite induced apoptosis in human leukemia cells, now we show autophagic cell death occurred after selenite exposure in HL60, suggested an alternative mechanism for the potential therapeutic properties of selenite. Additionally, Death-associated Protein Kinase (DAPK) performed a significantly increased expression during this process, concomitantly with gradually decreased phosphorylation at Ser308. We further reveal that the up-regulation of DAPK which depends on selenite-activated ERK had no effect on autophagy. However, activation of DAPK via PP2A-mediated dephosphorylation at Ser308 serves as a new strategy for autophagy induction. In conclusion, these results indicate that PP2A-mediated activated DAPK sensitizes HL60 cells to selenite, ultimately triggers autophagic cell death pathway to commit cell demise. [BMB reports 2012; 45(3): 194-199]

The Effects of Surfactants on the Spinnability, Structure and Properties of Dry-jet Wet Spinning Poly(m-phenylene isophalamide) Fiber

Qianli Liu,Kaikai Cao,Shikai Qi,You Yang,Shuheng Liang,Huihui Gao,Chen Yang,Dazhe Li,Mengjin Jiang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7

The spinnability of semi-dilute poly(m-phenylene isophalamide) (PMIA) spinning dope was regulated by a smallamount of surfactants to make it suitable for dry-jet wet spinning. OP-10 shows the best effect of lowering the surface tensionof PMIA spinning dope among the selected surfactants. The effects of different amounts of OP-10 on surface tension andrheological behavior of PMIA spinning dope were investigated. Results show that when the content of OP-10 reaches0.5 wt.%, the surface tension of the PMIA dope reduces to a minimum. The apparent viscosity of the PMIA dope increaseswith the increment of OP-10 contents. The dynamic viscoelasticity study shows that OP-10 also enhances the elasticity of thePMIA spinning dope. The spinning dope with 0.5 wt.% OP-10 can be smoothly spun by dry-jet wet spinning, and theobtained PMIA filament shows excellent mechanical performance.