<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005">
<channel xmlns:cfi="http://www.microsoft.com/schemas/rss/core/2005/internal" cfi:lastdownloaderror="None">
<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->专题：飞行器设计与结构强度分析技术]]></title>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[GNSS ionospheric tomography with the unequal pixel size considering the geomagnetic effect]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In previous studies, traditional GNSS (global navigation satellite system) ionospheric tomographic methods neglect the influence of geomagnetic field on the ionospheric variations. In this method, a new GNSS tomographic algorithm with the unequal pixel size in the height was proposed to image the ionosphere in the geomagnetic coordinate, which takes into account the influence of electron density variation at different ionospheric heights and the geomagnetic field. Also, a new iterative relaxation factor was established in the proposed GNSS tomographic algorithm to improve the accuracy of the ionospheric electron densities. The performance of GNSS ionospheric tomographic method with unequal pixel size considering geomagnetic effects was evaluated by using the IRI—2007 (international reference ionosphere 2007) model, GNSS measured data, and ionosonde data. For simulation studies, IRI—2007 was used as references, while for GNSS data, the ionosonde data were used as references. The peak ionospheric electron density error, the average absolute percentage error of electron density profile results and the root mean square error were estimated by different GNSS tomographic algorithms. The validity of the tomographic algorithm with the unequal pixel sizes considering the geomagnetic effects is verified.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[HUO Xingliang, LIU Qi, LIU Haojie]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HUO Xingliang, LIU Qi, LIU Haojie</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006007]]></guid><cfi:id>19</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Improved FAHP-neural network health evaluation method for electromagnetic launch system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[It is of great significance to accurately and quantitatively evaluate the health status of electromagnetic emission system before launch. Focusing on the large deviation of health value in evaluating the serial structure of electromagnetic emission system when applying the FAHP(fuzzy analytic hierarchy process) method, which fails to meet the requirement of nonlinear variable weight of the system, an improved FAHP-neural network health assessment method was proposed. The improved method can be calculated by constructing a nonlinear function that can satisfy the serial structure health assessment when calculating the health index of the same-level elements, and the effectiveness of the method was testified from the aspect of mathematics. On the basis of the known prior information and measured data, the neural network model was introduced to solve the nonlinear variable weight requirement of system health evaluation. An improved health evaluation model based on the pulse forming network system of an electromagnetic launch system was established and evaluation experiments were carried out. The results show that the proposed evaluation method has high assessment accuracy, and the results are in line with the actual health status of the system under various health conditions. Compared with the traditional FAHP method, the proposed method can greatly improve the accuracy of evaluation, and have no error and leakage, which verifies the feasibility and practicability of the method.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[ZENG Delin, LU Junyong, ZHENG Yufeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZENG Delin, LU Junyong, ZHENG Yufeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006008]]></guid><cfi:id>18</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Least squares support vector machine for solving reflection model of submarine′s internal and external magnetic field]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For the promotion of submarine′s magnetic silencing ability, it is necessary to monitor the submarine′s permanent magnetic field immediately, and a reflection method of submarine′s internal and external magnetic field based on LS-SVM(least squares support vector machine) was proposed. Combined with internal and external reflection method and LS-SVM theory, an inside-out reflection model of submarine′s magnetic field was established by optimizing the model parameter with CV (cross validation). With the variation in the vertical component of the submarine′s external permanent magnetic field as an object of analysis, the extrapolation answers of simulation and hull experiment agreed well with the standard value. Compared to the RBFNN (radius basis function neural network), the proposed method has better generalization ability and extrapolation accuracy apparently, fits more in engineering facts, and can provide useful guidance in the research for closed-loop degaussing technology.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[LIU Shengdao, HE Baowei, ZHAO Wenchun, ZHOU Guohua]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Shengdao, HE Baowei, ZHAO Wenchun, ZHOU Guohua</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006009]]></guid><cfi:id>17</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Fault tolerance in HPC scientific workflow application]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Scientific workflow technologies in HPC are extensively applied in scientific research and engineering simulation domain. Application such as numerical simulation in complex multi-physics problems and multi-stages data process need software to compose an automatic executable workflow to increase the efficiency. There are lots of exceptions such as resource failure, task configurations errors which may cause the workflow execution to be ceased, therefore robust and continuous execution is important for workflow application. A taxonomy of fault tolerance in workflow was made and some fault tolerance techniques in typical workflow systems were reviewed. A decision-tree based event-condition-action fault tolerance model was proposed, and a non-intrusive extendable framework which was implemented in our HPC scientific workflow system HSWAP was designed. Runtime configurable error recovery strategies were also implemented in our fault tolerance software module. In order to validate our new model and framework, the fault tolerance functions were tested in real engineering simulation project. Results show that fault tolerance plays an important role in increasing workflow execution efficiency.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[LI Yufeng, MO Zeyao, XIAO Yonghao, ZHAO Shicao, DUAN Bowen]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Yufeng, MO Zeyao, XIAO Yonghao, ZHAO Shicao, DUAN Bowen</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006010]]></guid><cfi:id>16</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Recomputation and correction mechanism design for tagged instructions of the RISC-V core]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The reliability of the computer system is significantly compromised by the hardware transient faults which are mainly caused by the cosmic radiation and other environmental factors. To mitigate this undesirable impact and guarantee the correctness of the running programs, a recomputation and correction mechanism for tagged instructions for an open source core named “Humming bird e203”, which is based on the RISC-V instruction set architecture, was proposed. This mechanism adds extra flag bits for each instruction and thus enables flexible recomputation for any tagged instruction at low hardware cost. Besides, it can issue the tagged instruction again automatically if the result of the first recomputation is different from the original one. This majority voting scheme can efficiently rectify most data flow errors caused by transient hardware faults. The experimental results show that with our proposal and the interrupt handler, the average probability at which programs can operate correctly can be increased by 86.67% under the random transient fault insertion.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[DENG Ding, GUO Yang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>DENG Ding, GUO Yang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006011]]></guid><cfi:id>15</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[New method for ocean surface current retrieval by along-track interferometric SAR based on genetic algorithm]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The research on ocean surface current sounding by along-track interferometric SAR is an important role in realizing the globalization and refinement of current information. In order to improve the iteration convergence speed and parameter retrieval accuracy of ocean surface current, the correction coefficient design problem was transformed into scale factor selection problem under constraints of the phase difference between the simulated interference phase and the measured phase difference, and radar, and platform parameter, according to the parameter characteristics of the correction coefficient to construct the constraint relation of the fitness function. The technical method was designed to calculate the correction coefficient by genetic algorithm, which was embedded in the iterative retrieval algorithm to construct a new retrieval method. The results of spaceborne SAR data simulation showed that the RMSE of current direction is better than 10.0°, and the RMSE of current velocity is better than 0.1 m/s, which meets the requirements of ocean surface current retrieval accuracy. The improved ocean surface current retrieval algorithm can reduce the number of iterations by 2 to 3, which effectively improves the retrieval efficiency. The research is of great significance to improving the effectiveness and accuracy of ocean surface current sounding by along-track interferometric SAR.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[ZHAO Xianbin, YAN Wei, WANG Rui, LU Wen]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHAO Xianbin, YAN Wei, WANG Rui, LU Wen</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006012]]></guid><cfi:id>14</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Simplified deep learning model for epilepsy electroencephalogram]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006013]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A simplified deep learning model was proposed to solve the problem of recognition based on the strong randomness and rapid dynamic change of EEG(epilepsy electroencephalogram) signals. The proposed model utilizes one-dimensional convolutional neural network, which simplifies the convolutional layers and pooling layers to improve the efficiency. Based on the overall Keras framework, the RMSProp algorithm was used for the model in the training process, and the algorithm estimated the loss through a predefined objective function. The model design incorporated a batch normalization layer and a global mean pooling layer. The EEG recognition was researched from two aspects based on the proposed model:with empirical mode decomposition, the first three orders, the first five orders, the first seven orders, and the first eight orders of intrinsic mode functions were selected for comparative analysis on the simplified model. Because of deep learning characteristics, the proposed model can directly recognize the original EEG signals without feature extraction. After extracting 7 types of features,it adds three different methods to compare the accuracy. The experimental results show that:the recognition rate of the first three orders of intrinsic mode function reaches the level of 92.1% for the five different types of EEG signals, which is higher than that of other features. The first eight orders′ recognition rate is lower than the original signal, which indicates that data preprocessing will lead to the noise. The proposed simplified deep learning model can effectively deal with the epileptic EEG recognition problem with higher efficiency and better performance.]]></description>
<pubDate>2020/12/2 10:56:12</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[ZHANG Jin, LIU Rong, TIAN Sen, CHEN Sheng, WEI Jianhao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Jin, LIU Rong, TIAN Sen, CHEN Sheng, WEI Jianhao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202006013]]></guid><cfi:id>13</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Review of layerwise theory for composite materials laminated structures and its applications]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Layerwise theory, proposed by Reddy, is a 3D analysis method for accurately analyzing composite laminated plates and shells. Without introducing any deformation and stress hypothesis, layerwise theory, compared with the classical equivalent single layer theories, has greater advantages for static and dynamic responses analysis of thick composite laminated plates and shells, especially for local interlaminar effects analysis. A review and recent research progress of the layerwise theory were presented, and its numerical solutions and applications were demonstrated as well. The basis of layerwise theory and its recent development were introduced. The implementation of layerwise finite element method and its refined models were discussed. The employment of layerwise theories for conducting static and vibration analyses and the damage model analysis of composite laminated plates and shells were outlined. And several future research trends were recommended in the end.]]></description>
<pubDate>2021/6/2 0:00:00</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[SHEN Haijun, LI Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SHEN Haijun, LI Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103001]]></guid><cfi:id>12</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research progress and application of thermal fluid platelet devices]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The platelet technology has been in rapid development because of several features, including the special structure of flow channel, the precise size and location, and can provide solutions to difficult thermal and fluid flow problems. As a result, the platelet technology is a major technological innovation in the history of science and technology. The characteristics and development of platelet fluid devices were briefly introduced. Some typical new applications at home and abroad in recent years, such as platelet injector, platelet transpiration cooling nose-tip, platelet fluid mixer, platelet thruster of high speed ship and platelet muffler were summarized. Finally, the correlation of processing of platelet technology and 3D printing technology was described.]]></description>
<pubDate>2021/6/2 0:00:00</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[YIN Liang, LIU Weiqiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YIN Liang, LIU Weiqiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103002]]></guid><cfi:id>11</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of stochastic chaotic motion on supersonic two-dimensional airfoil]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The stochastic chaotic characteristics of supersonic two-dimensional airfoil were studied by Kapitaniak method. Nonlinear aerodynamics and aerodynamic moments of supersonic two-dimensional airfoil were deduced by the third-order piston theory. The 2 degree of freedom differential equation of motion of the airfoil with pitch cubic nonlinearity under stochastic disturbance was established and written in the form of 4-dimensional state equation. Then the system state equation was reduced to 2-dimensional by using the central manifold method. After that, the combination of the methods of cumulant neglect and non-Gauss truncated was used to obtain the two-dimensional probability density function and the probabilistic time-difference diagram of the system. Therefore, the Kapitaniak method was used to analyze the stochastic chaotic characteristics of the system under different disturbance intensities. Finally, the system response, Poincare cross-section diagram and the largest Lyapunov exponent were used to verify the stochastic chaotic characteristics of the system. The research is very important for the stability, safety and response characteristics of the supersonic two-dimensional airfoil in complex environment.]]></description>
<pubDate>2021/6/2 15:34:17</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[YAN Gai, FANG Mingxia, YANG Yinghao, SHEN Haijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YAN Gai, FANG Mingxia, YANG Yinghao, SHEN Haijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103003]]></guid><cfi:id>10</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Stress characteristics of bi-stable cylindrical shells with anti-symmetric laminated carbon fiber composite]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The bi-stable composite materials can be widely used in the design of variable structures. Using ABAQUS/Standard(version 2018), a finite element analysis of the shell′s snapping process was conducted to simulate the snap-through process and snap-back process of the bi-stable cylindrical shells with anti-symmetric laminated carbon fiber composites. The distribution and trend of the stress on the cylindrical shell during the whole continuous process were discussed to give advice to the design of this type of variable structure. The results show that the stress distribution of the composite cylindrical shells is very different during the snap-through process, the snap-back process and the second stable state. Moreover, the maximum stress moment on the entire cylindrical shell does not overlap with the moment when the maximum load is applied, and has hysteresis.]]></description>
<pubDate>2021/6/2 15:34:17</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[ZHANG Shujie, LI Guoze, ZHOU Yang, SHEN Haijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Shujie, LI Guoze, ZHOU Yang, SHEN Haijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103004]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis method of life shape parameter and fatigue threshold of composite laminates]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Special consideration must be applied in the analysis of fatigue life of composite materials due to its high scattering in mechanical property. The relationship between fatigue life Weibull shape parameter and residual strength shape parameter of M21C open-hole composite laminates were deduced based on the Sendeckyj equivalent static strength model and probability distribution of functions of random variables. The fatigue life shape parameter and fatigue threshold of M21C open-hole composite laminates were obtained through element tests and statistic analysis, which can provide support for the determination of LEF (load enhancement factor) and truncation levels for low loads of M21C composite material system.]]></description>
<pubDate>2021/6/2 15:34:17</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[LI Jiaqian, SHEN Haijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Jiaqian, SHEN Haijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103005]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of chamber pressure on thermal stress for submerged nozzle insert throat]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the influence of chamber pressure on thermo-structural response for the submerged nozzle of solid rocket motor, a simulation was carried out. By means of the commercial fluid software, based on the pressure solver, the flow field of pure gas in the nozzle was conducted and the temperature, pressure, and wall convective heat coefficients were obtained in the nozzle; according to the non-uniform pressure and non-uniform heat transfer coefficients obtained from the above flow field, using the finite element software, the thermo-structural problem of the submerged nozzle was solved at the pressure 6 MPa. Then, the ground firing test of solid rocket motor with the submerged nozzle was carried out, and the proposed numerical method is effective and accurate. By means of the same model and numerical method, the thermo-structural response of the submerged nozzle was solved at the pressure 9 MPa and 12 MPa, and the influence of combustion pressure on the thermal stress of throat insert was obtained. The simulation results show that during the entire operation process of solid rocket motor, the maximum hoop stress of throat insert is 103.9 MPa, which locates on the inner surface, and increases at first and then decreases with time; the hoop tensile stress increases at first and then decreases with the increasing of time for the throat insert, as well; with the increasing of pressure, the convective heat coefficients, the temperature and the hoop tensile stress increases, and the hoop compressive stress decreases for the throat insert.]]></description>
<pubDate>2021/6/2 0:00:00</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[GONG Jianliang, XU Huixiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GONG Jianliang, XU Huixiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202103006]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on design rationale of the shift parameter in nonlinear component of NORX]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[NORX is one of the fifteen candidates selected for the third round of the CAESAR (authenticated encryption:security, applicability, and robustness) competition. And its only nonlinear component is made up of XOR, AND and shift operations. The design rationale of the shift parameter of NORX from the perspective of nonlinear approximation and rotational properties were studied. On the one hand, the nonlinear approximation probability of the shift function is theoretically proved to be a three-valued function. When the shift parameter is 1, this function possesses the best nonlinear property. On the other hand, the rotational probability of the shift function is formulated. And it is proved that the maximal rotational probability is the same for all nonzero shift parameters. From the above results, the NORX has the best nonlinear approximation and rotational properties when the shift parameter takes 1. The results can be of reference to the analysis of NORX and can give theoretical guidance when designing similar ciphers.]]></description>
<pubDate>2021/1/26 15:58:01</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[SHEN Xuan, HE Jun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SHEN Xuan, HE Jun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101009]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Improved channel estimation method for OFDM/OQAM system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In the OFDM/OQAM system, higher pseudo pilot power means more accurate channel estimation. According to this principle, an effective channel estimation method based on the improved preamble structure with higher pseudo pilot power was proposed. On the basis of the previous preamble structure, the preamble structure with highest power was improved and its channel estimation method was proposed. Because of the lack of enough prior knowledge of receipt signal, the channel is unable to be estimated. The pre-decision method was utilized to solve this problem. The error caused by the pre-decision was reduced through iteration, thus the estimation accuracy was improved. Simulation results prove that the proposed preamble structure shows better channel estimation performance and higher spectral efficiency.]]></description>
<pubDate>2021/1/26 15:58:02</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[LIU Yongjin, CHEN Xihong, ZHAO Yu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Yongjin, CHEN Xihong, ZHAO Yu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101010]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimization decision method for task-oriented modular satellite rapid construction]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Making an optimized and practicable satellite assemble plan, which is closely linked to all the various constraints, is a difficult problem. This issue has attracted wide attention all over the world. In linght of this, the problem′s characteristics were analyzed, the mathematical optimization model was established, and an optimization decision method based on genetic algorithm was proposed. A constraint handling method based on penalty function was introduced to deal with the infeasible solutions generated in the iterative optimization process. In order to alleviate the difficulty of the penalty coefficient setting, a mechanism of penalty coefficient self-adaptive adjustment was designed. Some experiments were conducted to validate the correctness and practicability of the proposed algorithm.]]></description>
<pubDate>2021/1/26 15:58:04</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[CHEN Hao, PENG Shuang, DU Chun, WU Jiangjiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Hao, PENG Shuang, DU Chun, WU Jiangjiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101011]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Joint learning of Chinese word segmentation and named entity recognition]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The convolutional structure was introduced into the recurrent neural network to construct a convolutional recurrent neural network. Based on this network, a sequence annotation model for joint learning of Chinese word segmentation and entity recognition was constructed. The model relies on the convolutional recurrent neural network to construct feature-encoding layer, which realizes the joint extraction of local spatial features and long-distance time-dependent features of Chinese character sequences; the improved recurrent neural network was relies on the constructing of tag-decoding layer, which realizes the effective modeling of timing-dependent features in the tag sequences; the unified word segmentation and entity recognition annotation mode relies on the achieving of joint learning of word segmentation information and entity information, which avoids the error propagation problem of traditional pipeline methods. Experimental results on the People′s Daily corpus and Microsoft′s annotated corpus show that the framework has significant performance improvement over traditional statistical models and neural network models, especially when identifying entities with multiple characters, and its effect is significantly better than other methods.]]></description>
<pubDate>2021/1/26 15:58:05</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[HUANG Xiaohui, QIAO Lisheng, YU Wentao, LI Jing, XUE Han]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HUANG Xiaohui, QIAO Lisheng, YU Wentao, LI Jing, XUE Han</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101012]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Construction of vehicle logo dataset in natural scenes and its application]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101013]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As one of the key characteristics of vehicle identity, vehicle logo plays an important role in vehicle monitoring and identification. Due to the complexity of the natural scene, it is still a great challenge to identifying the vehicle logo accurately. At present, there are few open databases and there are many limitations, which lead to the lack of credibility and practicability. In this paper, a new dataset for natural scenes which contains 10 324 images with 67 types of vehicle logos in various acquisition environments was established. Based on this dataset, a vehicle logo recognition method based on target detection and deep learning was proposed. The method includes two major steps:regional positioning of vehicle logo and prediction of vehicle logo type. Experiments show that the proposed method has strong adaptability to complex background, and the overall recognition rate reaches 89.0% in the classification task involving 30 kinds of vehicle logos.]]></description>
<pubDate>2021/1/26 15:58:07</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[ZOU Beiji, LEI Taihang, LIU Shu, LIAO Wangmin, JIANG Lingzi]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZOU Beiji, LEI Taihang, LIU Shu, LIAO Wangmin, JIANG Lingzi</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101013]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimal arrangement for passive troposcatter surveillance system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101014]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To improve the localization accuracy of angle of arrival in passive troposcatter surveillance system, an improved particle swarm optimization was employed to arrange distributed nodes. Geometry dilution of precision was deduced and treated as the evaluation index. Chaos theory was adopted to modulate the position parameters for particle swarm optimization. Adaptive inertia weigh and learning factors were introduced to improve the optimization ability. In order to avoid getting stuck at local optimization and enhance the global exploration ability, swarm optimization based on two subgroups was adopted. The crossover operation and mutation operation were carried out based on two subgroups as well. Simulation results demonstrate that the proposed algorithm can obviously improve the location performance of passive troposcatter surveillance system, and the operating time is less than that of the traversal optimization.]]></description>
<pubDate>2021/1/26 15:58:09</pubDate>
<category><![CDATA[专题：飞行器设计与结构强度分析技术]]></category>
<author><![CDATA[LIU Zan, LIU Xiaopeng, CHEN Xihong, XIE Zedong, LIU Qiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Zan, LIU Xiaopeng, CHEN Xihong, XIE Zedong, LIU Qiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202101014]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
</channel>
</rss>