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Articles by Jing Liu
Total Records ( 5 ) for Jing Liu
  Jing Liu , Jie Ma , Jin-wen Tian , Zhi-wei Kang and Paul White
  In order to reduce the impact of the pulsar direction error on the navigation system performance, a novel X-ray pulsar navigation technique is proposed. Through analyzing the system bias caused by the pulsar direction error, it can be seen that the system bias is slowly time-varying. Based on the analysis result, the augmented state unscented Kalman filter (ASUKF), in which the system bias is treated as the augmented state, is designed here to deal with the system bias and estimate spacecraft’s positions and velocities. The simulation results demonstrate the effectiveness and robustness of the proposed navigation method. The ASUKF-based navigation method for spacecraft is more accurate than the method based on unscented Kalman filter (UKF) in the presence of the pulsar direction error.
  Jing Liu , Ying Miao , Zheng Zhao and Wenbo Zhao
  Protein and peptides are popular supplements in sports nutrition which is most often used to increase the exercise performance of human and animals. The antioxidant capacities and antifatigue properties of whey hydrolysates fermented by Lactobacillus plantarum TUST200209 and its purified whey peptides were studied. The treatment groups were orally administered with high dose (1.5 g/kg/day) and low dose (0.5 g/kg/day) of whey hydrolysates and its purified peptides in Kunming mice for four weeks, respectively. High dose (1.5 g/kg/day) of 0.9% saline (vehicle group) and mixture of whey and Lactobacillus plantarum TUST200209 were used as control. Compared with vehicle group, whey hydrolysates and its purified peptides could significantly prolong the swimming time to fatigue (p<0.05) and increase levels of superoxide dismutase and glutathione peroxidase. Moreover, contents of malondialdehyde in red cell, quadriceps femoris and mitochondria decreased and most of the changes were significant (p<0.05) for the high dose of whey peptides. The high antioxidant capacities were consistent with high antifatigue ability. Compared with vehicle group, the group oral administered high dose of whey peptides demonstrated high levels of glucose, non-esterified fatty acid and liver glycogen (p<0.05). It demonstrated that the whey hydrolysates could significantly alleviate exercise fatigue of the mice induced by free radical, especially for its purified peptides.
  Hui Lu , Ruiyao Niu , Jing Liu and Zheng Zhu
  Task scheduling problem is one of the key technologies for automatic test systems. This study proposes a novel and integrated multicriteria decision mechanism called the chaotic non-dominated sorting genetic algorithm plus analytic hierarchy process (CNSGA-AHP) for the automatic test task scheduling problem (ATSP). This mechanism contains two parts: the multiobjective optimisation algorithm CNSGA and the decision making method AHP. CNSGA hybrids chaotic sequences based on the logistic map and the non-dominated sorting genetic algorithm II (NSGA-II) to avoid becoming trapped in local optima. It is responsible for the search process and obtains a set of compromise solutions. However, getting this set does not completely solve the problem. A best compromise solution still must be chosen out of that set. Thereupon, AHP is used for the final decision making process and chooses a best schedule from the solutions obtained by CNSGA. The applied AHP can handle uncertainty, make the consistency check easily to pass and reduce the workload of decision-makers. A real-world ATSP abstracted from a missile system is applied to verify the effectiveness of CNSGA-AHP. Results show that CNSGA-AHP is very concise and suitable for the ATSP.
  Hui Lu , Xiaoteng Wang and Jing Liu
  As the key element of automatic test systems, the Test Task Scheduling Problem (TTSP) is becoming an increasingly important issue. The TTSP often involves two kinds of constraints. The temporal constraints among tasks are often the net ones and the resource constraints are generated due to the lack of enough resources for each task. The current methods to handle the constraints can be classified into optimization and satisfaction. Most of them suffer much difficulty to solve the constraints in the TTSP. However, the optimization methods are abandoned since the infeasible solutions are not allowed in the TTSP to avoid the accidents. The current satisfaction methods are usually for the tree or chine constraints. In addition, there is seldom research on the temporal and resource constraints together. Hence, the Priority-based (PB) encoding is provided to solve the temporal constraints while the Scheme Choice Rule (SCR) is created to find the corresponding schemes to distribute certain resource to these tasks. The compounding of PB and SCR called PBSCR is embedded into a genetic algorithm and applied to two benchmarks. Empirical results suggest that PBSCR outperforms better than not only the optimization methods but also the satisfaction methods. The efficacy of PBSCR is thereby justified.
  Ming Cong , Xiangji Kong , Yu Du and Jing Liu
  Wafer pre-alignment is one of the most difficult and important part in wafer transmitting system. The key point of alignment is the position identification and information process. It is explored in this paper to use a new algorithm of vision information processing to obtain the special area of wafer edge and then concentrate to some feature points of wafer by which the wafer can be located. The basis principle of algorithm is to integrate least squares regression fitting, weighted means and compromise of wavelet coefficient method together in vision part. Also a new mechanical structure and vision system has been established to process the data and locate wafer. Experimental test is given showing that the system can carry out the alignment of wafer well and accurately by using the proposed algorithm and structure.
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