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A Trust-based Stable Routing Protocol in Vehicular ad-hoc Networks
Junxia Ma,Chen Yang 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.4
One of the greatest challenges in vehicular ad-hoc networks (VANET) is to establish stable routing. Due to dynamic network , keeping stable routing is a difficult problem. Therefore, trust-based stable routing (TBSR) protocol is proposed in this paper. The node is chosen to be next-hop node until it reaches to trust threshold. To evaluate the node trust, we introduce the node' role trust, interaction printer trust, and recommendation trust. Moreover, the Analytic Hierarchy algorithm is used to coalesce various recommendation opinions from neighbor nodes. The simulation results show that the proposed approach outperforms GPSR (greedy perimeter stateless routing) and OLSR (optimized link-state routing) in terms of throughput, average delay .
Iterative Identification Algorithms for Input Nonlinear Output Error Autoregressive Systems
Feng Ding,Junxia Ma,Weili Xiong 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
This paper focuses on the parameter estimation problems of input nonlinear output error autoregressivesystems. Based on the key variables separation technique and the auxiliary model identification idea, the output ofthe system is expressed as a linear combination of all the system parameters, the unknown inner variables in theinformation vector are replaced with the outputs of the auxiliary model and a gradient based and a least squaresbased iterative identification algorithms are derived. Simulation example is provided to illustrate the effectivenessof the proposed algorithms.
Xinyue Wang,Junxia Ma,Weili Xiong 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3
In this paper, the parameter estimation of bilinear state-space systems with missing outputs is studied. The bilinear model is transformed into a linear time-varying state-space model, and Kalman smoother with a timevarying gain is adopted to estimate missing outputs and unmeasurable states. Under the expectation-maximization (EM) algorithm scheme, an iterative estimation algorithm based on Kalman smoother is derived, in which the unknown parameters, missing outputs, and unmeasurable states can be estimated simultaneously. Two simulation examples, including a numerical example and a three-tank system experiment, are adopted to verify the effectiveness of the proposed algorithm.
Jiayan Duan,Hongwei Ma,Junxia Wang 대한전자공학회 2023 IEIE Transactions on Smart Processing & Computing Vol.12 No.6
In the context of cross-cultural communication, translation between languages has become increasingly important. Based on automatic Chinese–English translation, this study examined the processing of out-of-vocabulary (OOV) words. First, this paper briefly introduces two basic translation models: seq2seq and Transformer. Second, we propose a semantic-based OOV processing method, which replaces OOV words with the most similar words by calculating the semantic similarity of word vectors and then uses the source-language sentences with the replaced words to train a translation model. Compared to the seq2seq model, the Bilingual Evaluation Understudy (BLEU) values of the Transformer model were higher (37.26 for the NIST06 dataset and 30.75 for the NIST08 dataset). After OOV processing, retaining low-frequency OOV words was conducive to the improvement of BLEU scores, which were increased by 0.63 and 0.09 for NIST06 and NIST08 for the Transformer model, respectively. This shows the effectiveness of the OOV processing method. The OOV processing method could be applied to automatic Chinese–English translation.
Liu Kunqi,Wang Junxia,Wu Anhang,Wang Jin,Liu Die,Ma Xiaoling 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.6
In this work, Sr0⋅5Zr2(PO4)3-SmPO4 dual-phase ceramics were prepared via in-situ synthesis process, which is a potential novel nuclear waste form for immobilizing the fission product 90Sr and the trivalent actinide radionuclides in high-level waste (HLW). And the preparation technology, microstructure and chemical durability of Sr0⋅5Zr2(PO4)3-SmPO4 dual-phase ceramics were systematically investigated. It was confirmed that the optimum microwave-sintering temperature (1050 ◦C) and heat preservation time (1.5 h) is estimated by Archimedes method. Besides, the as-prepared samples that were consisted of strontium zirconium phosphate (SrZP) and monazite showed the remarkable densification, in which the two crystalline phases were intermixed well with each other. Meanwhile, the formation and evolution of microstructure was also consistent with the variational rule of Sr0⋅5Zr2(PO4)3/SmPO4, indicating that there was not mutual reaction during the in-situ synthesis process. The PCT and MCC-1 experimental results demonstrated that the elemental normalized leaching rates of tested samples are all at a low level (LRSr ~10 4 g‧m 2‧d 1, LRZr ~10 8-10 6 g‧m 2‧d 1, LRSm ~10 7-10 5 g‧m 2‧d 1 and LRP ~10 4 g‧m 2‧d 1). It is indicated that Sr0⋅5Zr2(PO4)3-SmPO4 dual-phase ceramics possesses excellent chemical durability for HLW disposal.