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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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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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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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Multi-target Detection of Metal Parts Based on Improved Deep Learning Algorithms 6

Multi-target Detection of Metal Parts Based on Improved Deep...

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6th International Conference on Artificial Intelligence and Big Data, ICAIBD 2023

作者： Liang, Cuiping Bai, Minsheng Deng, Lixiao Wang, Ying Jiang, Suiping Beijing Institute of Computer Technology and Applications Beijing China Northeastern University Liaoning Shenyang China

ISBN: (纸本)9781665491259

In the traditional industrial production process, the sorting of product parts mainly depends on human eye detection, which has high production cost and low production efficiency. At present, automatic identification of parts has become a major trend of the reform and development of the manufacturing industry. However, current researches of metal parts identification mainly focuses on the identification of common parts, such as bolts, nuts, gaskets, etc.. The number of parts is small, and the identification accuracy still needs to be improved in these researches. Based on the improved two-stage object detection algorithm Faster RCNN and the one-stage object detection algorithms YOLOv3 and YOLOv5s, this paper realized the recognition of 40 types of metal parts. The recognition accuracy of all improved models was more than 97%, of which the lowest was YOLOv3 (97.3%), followed by Faster RCNN, with the recognition accuracy of 98.1%. The recognition accuracy of YOLOv5s model was the highest, reaching 99.4%, and the detection speed reached 179 frames per second. The results showed that the improved YOLOv5s algorithm achieved the highest recognition accuracy and recognition speed in the identification of metal parts, and could meet the needs of industrial scenes. The research in this paper could play an important role in promoting the application of these algorithms in the industrial field. © 2023 IEEE.

关键词： Object detection

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Shift visual cryptography scheme of two secret images

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自然科学进展(英文版) 2003年第6期13卷 457-463页

作者： WANG Daoshun LUO Ping YANG Lu Qi Dongxu Dai Yiqi Department of Computer Science and Technology Tsinghua University Beijing 100084 China Chengdu Institute of Computer Applications Chinese Academy of Sciences Chengdu 610041 China School of Information Science and Technology Zhongshan University Guangzhou 510275 China

A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.

关键词： visual cryptography compound function family minimum threshold scheme

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CDCAT: A Multi-Language Cross-Document Entity and Event Coreference Annotation Tool

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Tsinghua Science and technology 2022年第3期27卷 589-598页

作者： Yang Xu Boming Xia Yueliang Wan Fan Zhang Jiabo Xu Huansheng Ning School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Beijing Engineering Research Center for Cyberspace Data Analysis and Applications Beijing 100083China Research Institute with Run Technologies Company Ltd.Beijing 100192China School of Information Engineering Xinjiang Institute of EngineeringUrumqi 830091China

A tool for the manual annotation of cross-document entity and event coreferences that helps annotators to label mention coreference relations in text is essential for the annotation of coreference corpora. To the best of our knowledge, CROss-document Main Events and entities Recognition(CROMER) is the only open-source manual annotation tool available for cross-document entity and event coreferences. However, CROMER lacks multi-language support and extensibility. Moreover, to label cross-document mention coreference relations, CROMER requires the support of another intra-document coreference annotation tool known as Content Annotation Tool, which is now unavailable. To address these problems, we introduce Cross-Document Coreference Annotation Tool(CDCAT), a new multi-language open-source manual annotation tool for cross-document entity and event coreference, which can handle different input/output formats, preprocessing functions, languages, and annotation systems. Using this new tool, annotators can label a reference relation with only two mouse clicks. Best practice analyses reveal that annotators can reach an annotation speed of 0.025 coreference relations per second on a corpus with a coreference density of 0.076 coreference relations per word. As the first multi-language open-source cross-document entity and event coreference annotation tool, CDCAT can theoretically achieve higher annotation efficiency than CROMER.

关键词： event coreference entity coreference manual annotation tool natural language processing

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A stable satellite routing algorithm based on a-star algorithm in dynamic networks 3

A stable satellite routing algorithm based on a-star algorit...

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2024 3rd International Conference on Electronic Information and Communication Engineering, EICE 2024

作者： Sun, Xiaohui Shen, Yuefeng Zhang, Huibin Beijing University of Posts and Telecommunications Beijing100876 China Beijing Institute of Computer Technology and Applications Beijing100039 China

This paper focuses on solving the routing optimization problem under the dynamic topology of the satellite communication network. With the rapid development of low-earth-orbit (LEO) satellite network communication technology, the dynamically changing topology of satellite networks has brought about frequent link switching and triggered a large number of routing updates. This paper proposes an improved routing algorithm named the Stable A-Star Routing (SASR) algorithm. The SASR algorithm is based on the A-star algorithm and aims to reduce path-switching frequency and enhance path stability by optimizing the path selection strategy. Through detailed simulation experiments and performance evaluation, we verified the performance advantages of the SASR algorithm in terms of the number of path switches, the number of path hops, the route convergence time, and the occurrences of congestion in business under different business volumes, and conducted comparative studies with classic algorithms. The results show that the SASR algorithm offers obvious advantages in key performance indicators. Compared with the Dijkstra algorithm and the A-star algorithm, the average number of path switches can be reduced by 22% and 10%, respectively. It shows more prominent advantages under a larger business volume, providing an efficient and reliable solution for routing optimization under the dynamic topology of satellite communication networks. © Published under licence by IOP Publishing Ltd.

关键词： Satellite communication systems

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