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Simulation and Analysis for Error from Satellite Capture Segment Anti-spoofing
Liu You-ming,Feng Qi,LIiTing-jun 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9
The anti deception technology of the capture section is put forward, which is based on the idea of three-dimensional space compression domain. In the first part, the acquisition range of the signal is strictly controlled and the difficulty of the attack is increased. Doppler frequency and code phase estimation error are the key factor to affect the performance of the technology. The smaller the estimation error is, the more accurate the position of the real signal can be accurately determined.
Research on Anti-Spoofing and Detection Technology in Satellite Positioning Section
Liu You-ming,Feng Qi,Li Ting-jun 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.8
The detector performance depends on the clock accuracy and the model, the clock parameters estimation error will lead to a decline in the performance of the detectors. Therefore, in order to reach the detector achieves a set of performance, it need to adjust the receiver of the crystal quality. In this paper, the method of detecting the clock states of the satellite navigation receiver is used to detect the receiver. The clock state model of the receiver is established in the static and motion mode, and the time variation of the clock state is analyzed.
Passive Track and Location Method with TDOA for Moving Target
Liu You-ming,Feng Qi,Li Ting-jun 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
Aiming at the problem of passive tracking of moving target, this paper establishes a mathematical model for the multi station time difference location and passive tracking of the moving radiation source and proposes a passive tracking algorithm based on extended Calman filter (Kalman Filter Extended, EKF). At first, the two order constant velocity motion model is established, the initial value and the initial co-variance of the Cal-man filter are used as the initial value and the initial co-variance of the system. The simulation results show that the extended Cal-man filter is used to achieve the real-time results of the time difference location. The positioning accuracy is greatly improved, and the target trajectory is more obvious. The tracking results can be approximate. Finally, the effectiveness of the proposed algorithm is verified by the engineering experiments.
Simulation and Analysis for Error from Satellite Tracking Segment Anti-spoofing
Liu You-ming,Feng Qi,Li Ting-jun 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.8
It is the first and most important step in the detection of satellite navigation deception attack. For the detection of the regenerative deception attack, a method based on carrier phase tracking spectrum analysis is proposed. The simulation experiment results show that this method can be used in the case that the false alarm probability is no more than 0.5%, and the detection probability is almost 100%. The method is not necessary for the transformation of the hardware, the signal processing module in the software receiver can be added to the corresponding processing module, and the detection of the deception attack can be realized.
Clinical Effectiveness of Preoperative Embolization for Cerebellar Hemangioblastoma
Liu, Ai-Hua,Peng, Tang-Ming,Wu, Zhen,Xiao, Xin-Ru,Jiang, Chu-Han,Wu, Zhong-Xue,Li, You-Xiang Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
The cerebellar hemangioblastoma (CHB) has an abundant blood supply and deep anatomical location. Complete surgical resection is generally very difficult. This study investigated the safety and effectiveness of preoperative embolization followed by surgical resection of CHB in a large cohort of patients. A database of 125 CHB patients with surgical resection in Beijing Tiantan Hospital between July 2006 and July 2012 was reviewed. Of those, 46 cases (experimental group) received preoperative embolization, 79 cases (control group) underwent surgery without embolization. Patient demographics, tumor size, duration of surgery, blood loss, blood transfusion, complications and follow-up results were collected and analyzed retrospectively. In the experimental group, the Kamofsky score (KS) was 80-100 in 40 cases (86.9%), 40-70 in 4 cases (8.7%), and below 40 in 2 cases (4.3%). Among 31 cases with follow-up, KS was 80-100 in 27 cases (87.1%), 40-70 in 2 cases (6.5%), and 0 in 2 cases (6.5%). In control group, KS was 80 -100 in 65 cases (82.2%), 40-70 in 6 cases (7.6%), 10-30 in 3 cases (3.8%), and 0 in 3 cases (3.8%). Among 53 cases with follow-up, KS was 80-100 in 44 cases (83.0%), 40-70 in 4 cases (7.5%), 10-30 in 1 case (1.9%), and 0 in 4 cases (7.5%). There were statistically significant differences between the experimental and control groups in tumor size, duration of surgery, amount of intraoperative blood loss and transfusion (p<0.01). However, complications (p=0.31) and follow-up results (p=0.76) showed no significant differences between groups. Selective preoperative embolization of those CHB patients with richer blood supply, higher hemorrhage risk, is safe and effective, and is a reliable adjuvant therapy for complete surgical resection of CHB.
Fu You Fu,Lie Zhao Liu,You Rong Chai,Li Chen,Tao Yang,Ai Fen Ma,Cun Ming Qu,Lin Jiang,Zheng Sheng Zhang,Jia Na Li 한국유전학회 2007 Genes & Genomics Vol.29 No.3
Husk proportion (HP) and lignin content (LC) are two important traits of seed quality of B. napus. Efficient selection of these two traits is an important way to improve the seed quality in meal improvement. A set of recombinant inbred lines (RILs) of B. napus (GH06 × Zhongyou 821) was used for mapping QTLs of HP and LC in a two-year study in different environments. 509 markers (78 SSR markers, 66 RAPD markers and 365 SRAP markers) were mapped on 26 linkage groups with an average length of 73.96 cM. The map covered a total of 1923 cM, and the average distance between two adjacent markers was 3.78 cM. Analysis of variance of LC and HP indicated that. LC might not be significantly affected by environment (F = 2.96 < 3.02) and HP might be affected by genotype × environment interactions. A total of 15 significant QTLs were detected in eight linkage groups with a LOD threshold value of 2.5 (LR ≥ 11.5) by CIM, explaining 4.99-16.14% of phenotype variation. Some QTLs of LC and HP were detected in near regions of the same linkage groups, such as qLCBB05-6-1 and qLCWZ06-6-1, qLCBB05-10-2 and qLCBB06-10-1 and qLCWZ06-10-2, qHPBB05-9-3 and qHPBB06-9-1, qHPBB05-10-4 and qHPBB06-10-2 and qHPBB06-10-3 and qHPWZ06-10-1. This study indicates that the repeatedly detected QTLs of LC and HP might be major-effect QTLs of LC and HP.
Dong-Ming Mo,Liu-Zhu Cao,Li Zhang,Shuang Ye,You-Rong Li 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
We report a set of direct numerical simulation results on Rayleigh-BénardMarangoni (R-B-M) flow of cold water in the cylindrical pools. The heat transfer between the free surface and the environment is considered. The aspect ratio Г of the cylindrical pool varies from 2 to 8. Rayleigh (Ra) and Biot (Bi) numbers are respectively confined in Ra ≤ 10 4 and 0 < Bi ≤ 50. The flow onset critical Ra is determined and the influences of Bi and the density inversion parameter ( mΘ ) on the critical Ra are analyzed. The primary bifurcation flow structures of R-B-M flow are shown and the evolution of the flow structures with Ra and Bi at different mΘ is observed. Furthermore, the heat transfer ability is estimated by Nusselt number. The results indicate that the critical Ra of the flow onset increases with increasing Bi and Θ m . But it decreases with the increase of Г. The primary bifurcation pattern is multicellular flow. With increasing Г, the number of flow cells in multicellular flow increases fast. With increasing Ra, the up-triangular and up-quadrilateral flow structures appear at Г = 4, and finally transits to the up one-torus. With increasing Ra and Г, and decreasing Θ m , average Nusselt number increases monotonically. However, with increasing Bi, it first increases, and then decreases.