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A Dorsal Hand Vein Extraction Algorithm For Region Of Interest, Li Qi, Jianjiang Cui, Dingyu Xue, Hongyu Geng 2019 1. School of Information Science &Engineering, Northeastern University, Shenyang 110819, China; ;2. School of Electronic and Information Engineering, University of Science and Technology, Anshan 114051, China;

A Dorsal Hand Vein Extraction Algorithm For Region Of Interest, Li Qi, Jianjiang Cui, Dingyu Xue, Hongyu Geng

Journal of System Simulation

Abstract: The rotation and translation of dorsal hand result in deviation, which brings interference during recognizing valid region when collecting dorsal hand vein image. In order to locate valid recognition area quickly, an extraction algorithm for region of interest based on maximum inscribed circle is proposed in view of the characteristics of the collected image. For the collected dorsal hand vein image, this algorithm calculates the center of the maximum inscribed circle and the center of mass, and the rotation angle of the dorsal hand is calculated. The position of the dorsal hand vein image is corrected and the recognition …


Research On Hwil Simulation Of Rf/Ir Dual-Mode Sensors Based On Compact Antenna, Gao Yang, Ma Jing, Huiyang Qu, Qun Wei, Jindong Fei 2019 1. Science and Technology on Special System Simulation Laboratory, Beijing Simulation Center, Beijing 100854, China; ;

Research On Hwil Simulation Of Rf/Ir Dual-Mode Sensors Based On Compact Antenna, Gao Yang, Ma Jing, Huiyang Qu, Qun Wei, Jindong Fei

Journal of System Simulation

Abstract: The advent of RF/IR dual-mode sensor technology in the more and more completed detecting environment has led to the requirement of simulation tools that are necessary to test dual-mode sensor. The hardware-in-the-loop simulation experiment and test of the radio frequency/infrared composite sensor are carried out.A RF/IR dual-mode simulation method based on the Compact antenna test ranges is proposed here. This system consists of IR simulator, RF simulator, beam-combiner etc. The testing result shows that RF/IR dual-mode simulation system has abilities of IR transmission and RF reflection, and could be used in RF/IR dual-mode sensor simulation.


Simulation And Analysis On The Moving Performance Of Quiet Zone On Compact Antenna Test Range, Liwei Guo, Simin Li, Ma Jing, Peng Lin, Jiang Xing 2019 1. Guilin University Of Electronic Technology, Guilin 541004, China; ;

Simulation And Analysis On The Moving Performance Of Quiet Zone On Compact Antenna Test Range, Liwei Guo, Simin Li, Ma Jing, Peng Lin, Jiang Xing

Journal of System Simulation

Abstract: Compact Antenna Test Range (CATR) is an important equipment for Radar-Cross Section test. In order to generate an approximate Uniform Plane Wave (UPW) illuminating environmentand satisfy far field conditions of antenna measurement, the quiet zone scanning of the compact antenna test range is studied by controlling the phase of the array feeding. When the three-tuple array feed and the 2×2 array feed are simulated and only phase changes, the array feed beam scanning is controlled to realize the quiet zone scanning characteristics.The movement characteristics of the quiet zone for the compact antenna test range is analyzed. The movement of …


Flow Stability Of Hunt Flow Under Low-Intensity Magnetic Field, Dong Shuai, Li Shuang, Xuemin Ye 2019 School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China;

Flow Stability Of Hunt Flow Under Low-Intensity Magnetic Field, Dong Shuai, Li Shuang, Xuemin Ye

Journal of System Simulation

Abstract: The stability of conducting fluid flow in ducts under magnetic field is vital to materials preparation and the design and operation of thermonuclear fusion cooling system. A model of MHD duct flow which is known as Hunt’s flow is simulated by non-normal mode stability analysis in this study.. The amplification and distribution of optimal primary perturbations are obtained by solving iteratively the direct and adjoint governing equations with respect of the perturbation variables. Four modes of perturbations with different symmetries in the space are considered, and the effect of the low-intensity magnetic field is also taken into …


Research On Urban Rail Transit Route Choice Decision Based On The Improved Imperialist Competition Algorithm, Xiaofeng Lian, Ye Lu, Wang Yan, Limin Jia, Huiru Ma 2019 1. School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China; ;

Research On Urban Rail Transit Route Choice Decision Based On The Improved Imperialist Competition Algorithm, Xiaofeng Lian, Ye Lu, Wang Yan, Limin Jia, Huiru Ma

Journal of System Simulation

Abstract: This paper proposes a method of passenger route selection based on the imperialist competition improvement algorithm (FAST-ICA) to improve the efficiency of passenger route selection. Six key factors influencing the choice of passenger route are selected. On this basis, the generalized travel cost function is constructed and the passenger route selection model is established. By improving the imperial competition way in the imperialist competition algorithm (ICA), the weakest imperial groups are quickly divided up in each iteration of ICA algorithm to accelerate the convergence rate. Based on the proposed FAST-ICA algorithm, the problem of passenger choice in different environments …


Research On Fluid Dynamics Simulation Of Welding Pool Based On Sph Method, Benkai Xie, Zhou Qiang, Li Qin, Ruijun Lin 2019 1. College of Logistics, Zhengzhou University of Aeronautics, Zhengzhou 450046, China; ;4. Collaborative Innovation Center for Aviation Economy Development, Zhengzhou 450000, China;

Research On Fluid Dynamics Simulation Of Welding Pool Based On Sph Method, Benkai Xie, Zhou Qiang, Li Qin, Ruijun Lin

Journal of System Simulation

Abstract: In the development of virtual welding training equipment, real-time interactive simulation of weld forming is the key technology. The current simulation method of weld formation is studied in this pape..For the problem of long time computation and no sense of fluid motion in weld simulation process, a simulation method of weld forming simulation based on smooth particle hydrodynamics is proposed. This method includes the calculation of temperature field which can calculate the fluid particle temperature and modify the updating step of fluid particles according to the temperature of fluid particles. This can realize the transformation of fluid particles from …


Image-Based Localization Of User-Interfaces, Riti Gupta 2019 San Jose Statte Universitty

Image-Based Localization Of User-Interfaces, Riti Gupta

Master's Projects

Image localization corresponds to translating the text present in the images from one language to other language. The aim of the project is to develop a methodology to translate the text in image captions from English to Hindi by taking context of the images into account. A lot of work has been done in this field [22], but our aim was to explore if the accuracy can be further improved by consideration of the additional information imparted by the images apart from the text. We have explored Deep Learning using neural networks for this project. In particular, Recurrent Neural Networks …


Adversarial Attack On Neural Machine Translation System, Abijith K. P. 2019 Indian Statistical Institute

Adversarial Attack On Neural Machine Translation System, Abijith K. P.

Master’s Dissertations

Nowadays Deep Neural Network based solutions are deployed to solve numerous tasks. Thus, it has become absolutely important to study the robustness of these systems. Machine Translation is one of the popular applications of Deep Neural Networks. This thesis studies the robustness of Neural Machine Translation systems by generating adversarial examples with the objective to fool the model. Whenever there is a change in the source, i.e. when a word in the input sentence is replaced by an unrelated word, the translation system is supposed to reflect the changes while doing translation. These unwanted invariance learned by the model is …


Simulation Analysis Of Head And Neck Injuries For Aircrew Escape System During Traction Rescue, Bohao Xing, Qianxing Zhou, Xingwei Wang, Yuan Yue 2019 1. School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;;

Simulation Analysis Of Head And Neck Injuries For Aircrew Escape System During Traction Rescue, Bohao Xing, Qianxing Zhou, Xingwei Wang, Yuan Yue

Journal of System Simulation

Abstract: The biomechanical response of human head and neck was studied to safeguard the helicopter aircrew in the traction escape process. A finite element model of human head and neck was established based on the Chinese pilot’s stature standard. The simulation and experiment results were compared to verify the validity of the model. The simulations under different period overload accelerations obtained from manikin traction aircrew escape experiment were performed to analyze the injuries of human head and neck in the processes of one shoulder traction and both shoulders traction. By an analysis of the head impact and acceleration, the simulation …


Airplane Pre-Conditioning Optimizing Control Based On Large-Scale System Theory, Xiuyan Wang, Gewen Zhang, Zhou Chen, Zongshuai Li, Yanmin Liu 2019 1. School of Electronics Information and Automation, Civil Aviation University of China, Tianjin 300300, China;;2. Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;

Airplane Pre-Conditioning Optimizing Control Based On Large-Scale System Theory, Xiuyan Wang, Gewen Zhang, Zhou Chen, Zongshuai Li, Yanmin Liu

Journal of System Simulation

Abstract: Aiming at airplane pre-conditioning optimizing control, a modified OPBM (Output Predicition and Balance Method) was introduced. Taking Boing 737 airplane pre-conditioning as the research subject, the decentralized identification algorithm was adopted for establishing the airplane pre-conditioning large-scale system model; the optimal objective considering the system energy consumption, air conditioning area human comfort, and air quality was proposed; and the global system optimization operating condition model was constructed. The OPBMLF with local feedback was designed to optimize globally airplane pre-conditioning system model. Matlab was used for achieving simulation research, and the results was compared with the real data. The results …


Optimization Simulation Analysis Of Process Parameters On Sunroof Roller Hemming Quality Of Car, Haijiang Liu, Qingqing Xu, Tang Da 2019 School of Mechanical Engineering, Tong Ji University, Shanghai 201804, China;

Optimization Simulation Analysis Of Process Parameters On Sunroof Roller Hemming Quality Of Car, Haijiang Liu, Qingqing Xu, Tang Da

Journal of System Simulation

Abstract: In order to solve the problems of car creep or roll-in and grow or roll-out and wave wrinkling defects in the process of sunroof roller hemming, two quantitative indicators of roller hemming—“coefficient of wave wrinkling” T and “coefficient of creep or roll-in and grow or roll-out” D were put forward in terms of the flange height, roll diameter and distance of TCP-RTP (tool center point-robot target point); a simulation experiment was designed based on orthogonal test; and a finite element model was established. By analyzing the simulation experiment data, the weights and trends of the influence factors on …


Simulation Of Helicopter Anti-Submarine Route Planning, Zhu Zhi, Yonglin Lei, Yifan Zhu 2019 College of Systems Engineering, National University of Defense Technology, Changsha 410073, China;

Simulation Of Helicopter Anti-Submarine Route Planning, Zhu Zhi, Yonglin Lei, Yifan Zhu

Journal of System Simulation

Abstract: Simulation of helicopter anti-submarine tactics not only requires pure theory analysis, but also needs an efficient simulation system support. Current anti-submarine tactics in the search phase include the use of dipping sonar and sonobuoys. A simulation case is designed based on equipment on service; the evaluation of above tactics on helix square, parallel round, and line spread using dipping sonar is presented. The tactics on the circle, square, and triangle using sonobuoys are evaluated as well. It shows that the proposed method can improve the efficiency of simulation application development, so as to meet the requirements of simulation-based military …


Surgery Simulation Of Internal Fixation For Compression Fractures, Xie Cui, Junmei Geng, Li Jian, Junyu Dong 2019 Department of Computer Science and Technology, Ocean University of China, Qingdao 266100, China;

Surgery Simulation Of Internal Fixation For Compression Fractures, Xie Cui, Junmei Geng, Li Jian, Junyu Dong

Journal of System Simulation

Abstract: Virtual surgery simulation provides new means for medical surgery training with realism and immersion. A virtual surgery simulation of internal fixation for compression fractures is designed and implemented. By constructing 3D surgical scene, making deformation animation, adopting multi-level colliders combination and switching method for collision detection, and designing a multi-factors force feedback model to compute the tactile force and mapping the values to the different levels of vibration intensity of the HTC handle, combining with voice guidance and UI visual feedback, a visual, audible and tactile multi-channel surgical experience can be obtained. The system provides a guiding training module …


Pulse Signal Detection Based On Dual Extended Duffing Oscillators, Wenmao Luo 2019 Department of Telecommunications, Nanjing College of Information Technology, Nanjing 210023, China;

Pulse Signal Detection Based On Dual Extended Duffing Oscillators, Wenmao Luo

Journal of System Simulation

Abstract: Because the chaotic oscillator can detect signal under lower SNR than the usual signal detection methods, it has been widely studied. In order to extend the application range of the existing chaotic oscillator to aperiodic pulse signal detection, a detection method based on dual Duffing oscillator is proposed. The method uses the difference between the state variables of two generalized time scale Duffing oscillators to detect signal. By selecting the system parameters rationally, the method can detect aperiodic square pulse while the SNR is as low as -30 dB, and detect signals at lower SNR than existing methods. …


Study On Simulation Technology Of Bi-/Multistatic Sar Radio Echo, Liu Jin, Zhe Liu, Ni Hong, Qingchang Tao 2019 1. Beijing Electro-Mechanical Engineering Institute, Beijing 100074, China; ;2. Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory, Beijing 100074, China; ;

Study On Simulation Technology Of Bi-/Multistatic Sar Radio Echo, Liu Jin, Zhe Liu, Ni Hong, Qingchang Tao

Journal of System Simulation

Abstract: A real-time bi-/multistatic synthetic aperture radar (SAR) radio frequency signal simulation method for three-dimensional scene target is proposed. This method divides scene map with 5*5m resolution and presets ackscattering-coefficient. According to the flight path and geometrical model, the key parameters such as the range between SAR and target and the weighting coefficient of the antenna pattern can be calculated. Then, the real-time simulation of bi-/multistatic SAR echo signal is realized in complex scenes by utilizing fast time-domain convolution. The validity of the method is proved by simulation.


Gpr Modeling Method Based On Kernel Slow Feature Analysis And Time Delay Estimation, Huilai Peng, Weili Xiong 2019 1. College of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China; ;

Gpr Modeling Method Based On Kernel Slow Feature Analysis And Time Delay Estimation, Huilai Peng, Weili Xiong

Journal of System Simulation

Abstract: A Gaussian process regression modeling method based on kernel slow feature analysis is proposed to deal with the time delay and nonlinear characteristics in industrial processes. The time delay in the industrial data is effectively extracted by fuzzy curve analysis and the optimal time-delay in the data is obtained. The model data is reconstructed based on the optimal delay. The method of kernel slow feature analysis is used to extract the nonlinear features of the reconstructed data. The Gaussian process regression model is established based on the extracted features. The effectiveness and performance of the method are verified by …


Gi-Map Tree: Global Illumination Collaborative Real-Time Rendering In Web3d Dynamic Scene, Liu Chang, Jinyuan Jia, Yifan Lu, Zhang Qian, Zhao Lei 2019 1. Tongji University, Shanghai 201804, China; ;2. Nanchang Aviation University, Nanchang 330063, China; ;

Gi-Map Tree: Global Illumination Collaborative Real-Time Rendering In Web3d Dynamic Scene, Liu Chang, Jinyuan Jia, Yifan Lu, Zhang Qian, Zhao Lei

Journal of System Simulation

Abstract: For the dynamic illumination in web-based virtual reality environment, an interactive real-time rendering mechanism that integrates pre-storage, scheduling and optimization based on a collaborative real-time rendering system. The mechanism helps the rendering system to construct a viewpoint-based pre-storage structure, “GI map tree”, to save and organize illumination rendering information on cloud server. With the assist of “GI map tree” and the user's input behavior, a “heat”-based GI map group scheduling algorithm is proposed to improve the transmission efficiency of the rendering system in this mechanism. The experiment results of Web3D application in the Web environment show that the …


Simulation Research On Operation Effect Of Vav Air-Conditioning System With Variable Water Temperature Strategy, Qinglong Meng, Zhibo Zhang, Xiong Cheng 2019 1. School of Civil Engineering, Chang’an University, Xi’an 710061, China;; ;2. School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China;; ;

Simulation Research On Operation Effect Of Vav Air-Conditioning System With Variable Water Temperature Strategy, Qinglong Meng, Zhibo Zhang, Xiong Cheng

Journal of System Simulation

Abstract: Aiming at the problem of coordinated operation between VAV (variable air volume) and variable water temperature in central air conditioning system, a TRNSYS dynamic simulation model of air conditioning system with adjustable air supply and water supply temperature is established, and the accuracy of the model is proved by experiments. By controlling the terminal air volume to simulate the effect of variable water temperature operation on the air conditioning system under different load rates, the optimal water supply temperature of the air conditioning system under different load rates is obtained, and the variable water temperature operation strategy of the …


Synthetic Aperture Ultrasonic Imaging Algorithm Based On Robust Capon Beamforming In Eigenspace, Yecai Guo, Xiaoxing Ji 2019 1. College of Electronic and Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;; ;2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment, Nanjing University of Information Science & Technology, Nanjing 210044, China;;

Synthetic Aperture Ultrasonic Imaging Algorithm Based On Robust Capon Beamforming In Eigenspace, Yecai Guo, Xiaoxing Ji

Journal of System Simulation

Abstract: In order to lower the main lobe width and side lobe amplitude of SAF beams ,improve the robustness of ultrasound imaging algorithm, resolution, contrast in images, a synthetic aperture ultrasonic imaging algorithm based on robust Capon beamforming in eigenspace is proposed. Under the principle of MV, this algorithm firstly uses the Toeplitz to realize the reconstruction of the interference-noise covariance matrix and keep it nonsingular. Secondly, the vector error is constrained by the signal subspace and the elliptic constraint set in feature space. Finally, the optimal weight vector which is used to weight and image the echo data is …


Power Quality Disturbance Recognition Base On Maximum Variance Unfolding, Linlin Che, Yinghui Kong, Zhixiong Chen 2019 College of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China;

Power Quality Disturbance Recognition Base On Maximum Variance Unfolding, Linlin Che, Yinghui Kong, Zhixiong Chen

Journal of System Simulation

Abstract: In view of the complexity of power quality disturbance (PQD), a recognition method of PQD feature extraction method based on maximum variance unfolding (MVU) is proposed and PQD recognition is completed by combining classifier algorithm in this paper. The wavelet energy features of PQD are extracted by wavelet transform to construct the original feature set.For the reason that non-convex quadratic programming is transformed into convex semi-definite optimization problem by kernel function, the MVU method is applied to compress the sample features into 3-dimension features which keep low dimensional structure in high dimensional space and make a rough recognition of …


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