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Parallel　Digital　simulation　for　the　Control　Problem　in　Differential　Algebraic　System

Journal of Systems Engineering and Electronics 1996年第4期7卷 37-46页

作者： Chen Lirong & Liu Degui(beijing institute of computer Application and simulation technology,P.O.Box 3929, beijing 100854, P.R.China) Beijing Institute of Computer Application and Simulation Technology P.O. Box 3929 Beijing 100854 P.R. China

In this paper, a parallel simulation algorithm for the control problem in differential algebraic system is presented. The error of the algorithm is estimated. The stability analysis is made for a model problem and the... 详细信息

关键词： Parallel simulation algorithm Differential algebraic system Stability analysis.

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Some　Techniques　for　Solving　Ordinary　Differential　Equations　with　Discontinuities　in　Real－time　simulation

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Journal of Systems Engineering and Electronics 1996年第3期7卷 69-80页

作者： Xie Yajun Liu Degui & Li Bohu(beijing institute of computer Application and simulation technology,P.O.Box 3929,beijing 100854,P.R.China) Beijing Institute of Computer Application and Simulation Technology P.O. Box 3929 Beijing 100854 P.R. China

This paper discusses some techniques for treating discontinuities of the right-hand functions of ordinary differential equations (ODEs) in real-time digital simulation (RTDS). The numericalexperiments show that these ... 详细信息

关键词： Real-time digital simulation Discontinuity Polishing function.

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Combination Method for Parallel Computation in ODEs

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Journal of Systems Engineering and Electronics 1996年第4期7卷 19-26页

作者： Song Xiaoqiu(beijing institute of computer Application and simulation technology ) Beijing Institute of Computer Application and Simulation Technology P.O. Box 3929 Beijing 100854 P.R. China

In this paper, a 3rd order combination method with three processes and a 4th order combination method with five processes for solving ODEs are discussed. These methods are the Runge-Kutta method combined with a linear... 详细信息

关键词： Software Reliability Numerical analysis Combination method Parallel Computation,ODEs.

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PSVM: a preference-enhanced SVM model using preference data for classification

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Science China(Information Sciences) 2017年第12期60卷 165-178页

作者： Lerong MA Dandan SONG Lejian LIAO Jingang WANG Engineering Research Center of High Volume Language Information Processing and Cloud Computing Applications School of Computer Science and Technology Beijing Institute of Technology College of Mathematics and Computer Science Yan'an University Search Business Department Alibaba Group

Classification is an essential task in data mining, machine learning and pattern recognition *** classification models focus on distinctive samples from different categories. There are fine-grained differences between data instances within a particular category. These differences form the preference information that is essential for human learning, and, in our view, could also be helpful for classification models. In this paper, we propose a preference-enhanced support vector machine(PSVM), that incorporates preference-pair data as a specific type of supplementary information into SVM. Additionally, we propose a two-layer heuristic sampling method to obtain effective preference-pairs, and an extended sequential minimal optimization(SMO)algorithm to fit PSVM. To evaluate our model, we use the task of knowledge base acceleration-cumulative citation recommendation(KBA-CCR) on the TREC-KBA-2012 dataset and seven other datasets from UCI,Stat Lib and ***. The experimental results show that our proposed PSVM exhibits high performance with official evaluation metrics.

关键词： preference SVM classification sampling sequential minimal optimization(SMO)

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Online virtual experiment teaching platform for database technology and application 13

Online virtual experiment teaching platform for database tec...

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13th International Conference on computer Science and Education, ICCSE 2018

作者： Li, Lin Chen, Yufeng Li, Zhongjun Li, Dongni Li, Fengxia Huang, Hua School of Computer Beijing Institute of Technology Virtual Simulation Experimental Teaching Center of College Computer Beijing China

ISBN: (纸本)9781538654958

As the large-scale popularization of virtual experiment teaching, many universities and enterprises have built a batch of virtual experiment resources, which obtained preliminary application. To visualize the abstract concept of data relation and unobservable process of data storage, transmission and processing in the course of database technology and application, we designed and implemented a series of virtual experiment, including evolution of data storage, relational database design and SQL statement operation. The application results show that the virtual experiments are beneficial for both learning and teaching. Moreover, combined with online virtual experiment teaching platform, we complete the sharing and promotion of virtual experiment resources. © 2018 IEEE.

关键词： Virtual reality

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Study on virtualization-based simulation grid

Study on virtualization-based simulation grid

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2010

作者： Liu, Hanbing Su, Hongyi Zhang, Yabin Hou, Baocun Guo, Linqin Chai, Xudong Zhan, Shouyi School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China Beijing Simulation Center Beijing 100854 China

ISBN: (纸本)9780769539621

Firstly, the paper concisely introduces the research background of a new kind of networked modeling and simulation (M&S) platform based on the virtualization technology namely Virtualization-based simulation Grid. Then its connotation and the architecture of platform prototype are presented. Furthermore, some solved key techniques and some typical applications developed by authors are introduced, such as simulation resource virtualization technique, then simulation resource discovery and scheduling technique based on virtualization etc.. It can strengthen the capabilities of current networked M&S platform on dynamical resources sharing on-demand, supporting multi-user, collaboration, fault tolerant and security mechanism thus a new modeling and simulation mode is established. Finally, the conclusion and some further works are given. © 2010 IEEE.

关键词： Virtualization

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A Comparative Research of Thrust simulation and Practice for the Small Solid Rocket Motor 12

A Comparative Research of Thrust Simulation and Practice for...

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12th Asia Conference on Mechanical and Aerospace Engineering, ACMAE 2021

作者： Qin, Xiaoyu Shi, Haoming Wen, Chunyu Liu, Shiyu School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China Beijing Institute of Computer Technology and Applications Beijing100854 China

In practice, it is found that the simulation method applicable to the conventional size rocket motor cannot be directly applied to the design of the small rocket motor. Due to the change of size, the simulated thrust results differ greatly from the actual thrust results. In this paper, the tube grain and star grain are taken as examples to compare the simulated results with the actual experimental results. First, we determine a group of independent variables that can well reflect the changes of the main variables as a pretreatment and then use the zero dimensional interior ballistic algorithm for simulation. Finally, we design and conduct control experiments to draw a conclusion. The theoretical thrust was obtained by simulation and calculation, and the actual thrust was obtained by a lot of experiments. It was found that there were large offsets between the two types of grains, and the specific offsets corresponding to the two types of grains were obtained. The results show that there is a great difference between the simulated result and the actual result, which has a certain guiding significance for the design and research of small solid rocket motor. © Published under licence by IOP Publishing Ltd.

关键词： Rocket engines

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Design of encrypted OFDM system based on DFT-s-OFDM in FPGA

Design of encrypted OFDM system based on DFT-s-OFDM in FPGA

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2023 International Conference on Intelligent Systems, Communications, and computer Networks, ISCCN 2023

作者： Zhang, Chuanwen Shen, Yuefeng Zhang, Jie Wang, Lvda Zhang, Huibin Beijing University of Posts and Telecommunications Beijing China Beijing Institute of Computer Technology and Applications Beijing China

ISBN: (纸本)9781510666238

When designing Orthogonal Frequency Division Multiplex(OFDM) system, high PAPR has become an important factor to be considered due to the superposition of signals on different subcarriers. This paper presents a FPGA scheme of DFTs-OFDM based IM-DDO-OFDM system including the transmitter and the receiver part which can effectively restrain PAPR of signals. Specific encryption sequences and high-order modulation are also introduced in order to promote the system security. The simulation and test results proves that PAPR of transmission signals are effectively reduced compared to the traditional OFDM system. © 2023 SPIE. All rights reserved.

关键词： Peak to average power ratio

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A terrain matching method for irregular military symbols based on the simplification of control points

A terrain matching method for irregular military symbols bas...

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International Workshop on Digital Media and Digital Content Management, DMDCM 2011

作者： Li, Fengxia Zhang, Qingyi Jie, Fei Beijing Key Laboratory of Digital Performance and Simulation Technology School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9780769544137

To realize the real-time rendering for regular and irregular military symbols, it proposed a terrain matching method based on the simplification of control points. The elevation values of the irregular military symbols were obtained primarily in the method. Then the elevation curve was differentiated and smoothed for times. And the final control points were obtained after the merging the initial control points. The corresponding three-dimensional model was generated after plotting on two-dimensional electronic map with the method. Experimental results showed that the model could guarantee real-time matching and obtain better matching results. The military symbols reflected terrain undulation well, thus displayed information of battlefield situation more precisely. © 2011 IEEE.

关键词： Arrays Equations Mathematical model Merging Military computing Process control Solid modeling collision detection irregular military symbols terrain matching

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Design of link layer controller for high speed serial bus

Design of link layer controller for high speed serial bus

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International Conference on Information Science and Engineering (ICISE)

作者： Yu, Yun Wang, Danghui Yang, Ke Feng, Zhihua School of Computer Science and Technology Northwestern Polytechnical University Xian China Beijing Institute of Computer Technology and Applications Beijing China

ISBN: (纸本)9781424480968

This paper designs a link layer controller for a serial bus that based on the IEEE 1394 standard. The design is compatible with the interface of physical-layer chips, and able to work at up to 400Mbps in asynchronous transmission mode. Fig. 1 shows the structure of the controller. Based on the analysis of the function of PHY-interface, Fig. 3 shows the control FSM of the PHY-interface. A speed auto-adaptive and no latency CRC, which could improve the transmission reliability, is proposed and it is implemented as shown in Fig. 4. The communication protocol between the link layer controller and the host CPU is also defined. Finally the link-layer controller is described in verilog HDL, and implemented on FPGA. The experimental results show preliminarily that the controller we designed works well in an asynchronous high speed data transform network systems. © 2010 IEEE.

关键词： Controllers

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