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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Zhang, Qi Tan, Sichao Zhao, Hangbin Wang, Peng Gu, Hanyang Yang, Yunjia School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineer University Harbin Heilongjiang China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9784888983051

In nuclear power plant, the reactor annular downcomer acts as the upstream of the reactor core, and boric distribution inside the downcomer is focused in the ECC situation. The relevant study indicates that the inlet coolant does not flow along annular channel directly, and the current multi primary loops layout makes the fluid mixing of the downcomer far more complex. In this paper, boron transport and mixing phenomenon inside the reactor annular downcomer were analyzed by Laser Induced Fluorescence (LIF) method, a reduziertreduced RPV model was built with transparent material, the boric acid was equivalently simulated by rhodamine B. The single loop and double loops flow mixing tests were respectively performed, the qualitative and quantitative data at cross sections were acquired. For the single loop test, the injected tracer transported along the circumferential position and was constantly diluted by the ambient pure water;meanwhile, a portion of the injection entered the lower space and filled up the annular channel in the same manner. From the time evolution of concentration gradient distribution, the increasement of inlet velocity is favorable to the uniform mixing. For the double loops fluid mixing tests, the tracer solution and pure water were injected into the model simultaneously through two independent entrances. The location of the intersection boundary of the two fluids was affected by the entrance momentum ratio, and the tracer distribution fluctuated remarkably in the lower space of the downcomer. Copyright © 2018-2019 by JSME

关键词： Boric acid

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Data augmentation of SAR sensor image via information maximizing generative adversarial net 4

Data augmentation of SAR sensor image via information maximi...

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4th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2021

作者： Xie, Dan Ma, Jing Li, Yibing Liu, Xinrui College of Information and Communication Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9781665432030

In practical applications, the SAR image dataset is always insufficient and lacks sample diversity. Generative adversarial nets(GANs) have been widely used to address the problem of insufficient data. However, owing to no restriction on input noise, the generated images are highly random and lack diversity. The paper proposes a data augmentation method based on the information maximizing GAN to generate samples purposefully. The proposed method is realized by using information-theoretic to extend the GAN, maximizing the mutual information between the observations and a fixed subset of noise variables. Finally, it finds out a highly semantic and meaningful hidden representation information in the SAR image and thus increases the sample diversity. The experiment results based on the MSTAD data illustrate the proposed method can effectively improve the robustness and accuracy of the classifier especially for the limited training dataset. ©2021 IEEE

关键词： Generative adversarial networks

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The Star Scene Modeling and Generation for Hardware-in-the-loop simulation

The Star Scene Modeling and Generation for Hardware-in-the-l...

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2018 International Conference on Computational, Modeling, simulation and Mathematical Statistics(CMSMS 2018)

作者： Ying ZHANG Hui-jie DU Yu ZHANG Yi-yuan MA Hui-yang QU Science and Technology on Special System Simulation Laboratory Beijing Simulation Center National Key Laboratory of Intelligent Manufacture System Technology for Complicated Products

The star sensor simulation system is used to test the star sensor performance on the ground, which is designed for star identification and spacecraft attitude determination of the spacecraft. The computer star scene based on the astronomical star chat is generated for hardware-in-the-loop simulation of the star sensor simulation system using OpenGL. The results of star scene generation are shown in this paper and applied in the real time star sensor simulation.

关键词： Star scene Modeling simulation Astronomical chat

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D2D communication relay selection strategy based on two-hop social relationship 4

D2D communication relay selection strategy based on two-hop ...

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4th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2021

作者： Wang, Jinling Ma, Jing Li, Yibing Liu, Xinrui College of Information and Communication Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9781665432030

Relay-assisted D2D communication can expand the communication range and improve the spectrum efficiency. However, most relay selection algorithms only consider single-hop information between transmitter and relay. To obtain better communication quality, we propose an Improved Relay Selection Strategy based on the Two-hop Social Relationship which not only considers the social relationship of transmitter-to-relay, but also the social relationship of relay-to-receiver. Besides, we combine the social awareness and channel state information to define the social relationship. The strategy determines the candidate relays according to the maximum D2D communication distance firstly, and then selects the optimal relay among candidate ones based on Two-hop Social Relationship (THSR). The simulation results show that the proposed algorithm can significantly improve the system throughput. ©2021 IEEE

关键词： Transmitters

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Research on Radar Active Deception Jamming Identification Method Based on RESNET and Bispectrum Features 2

Research on Radar Active Deception Jamming Identification Me...

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2nd International Conference on Computer Engineering and Application, ICCEA 2021

作者： Wang, Kunteng Dong, Zeyu Wan, Tao Jiang, Kaili Xiong, Wanan Fang, Xueli University of Electronic Science Technology of China School of Electronic Science and Engineering Chengdu China University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu China Key Laboratory of Complex Aviation Simulation System Beijing China

ISBN: (纸本)9781665426169

In the complex electromagnetic environment of modern electronic warfare, active deception jamming poses a serious threat to radar. This paper proposes the identification of active deception jamming based on residual neural network (RESNET), and studies the bispectral characteristics of the signal and the method of identifying the active deception jamming of RESNET. This algorithm firstly extracts the bispectral features of the jamming signal, and uses the bispectral diagonal slice as the input of RSNET to realize the recognition of active deception jamming. simulation results show that the algorithm has high recognition accuracy, not only has good anti-noise performance, but also has excellent robustness under low JSR. © 2021 IEEE.

关键词： Radar

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A Light Source system of Multi-star Simulator with Adjustable Background and Controllable Magnitude

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空间科学学报 2017年第6期37卷 760-765页

作者： SUN Gaofei LIU Shi ZHANG Guoyu ZHANG Yu LEI Jie MA Yiyuan College of Optoelectronic Engineering Changchun University of Science and Technology Changchun 130022 Optical Measurement and Control Instrumentation Jilin Province Engineering Research Center Changchun 130022 Key Laboratory of Space System Simulation Beijing 100853

A light source of multi-star simulator capable of background adjustment and magnitude control has been *** integrating spheres are employed as the star-point light source and the background light source respectively.A beam splitter prism has been designed to serve as the beam combiner for the star-point and the background light sources,and a mathematical model has been constructed respectively to compute the light flux of the two integrating spheres.A magnitude testing system and a background testing system have been created using low-light illuminometer,luminance meter,and testing instruments to measure the star-point magnitude and the background luminance of the multi-star *** test results suggest that the star-point magnitude is adjustable from0 to+5 m_v,with a simulation precision superior to ±0.026 m_*** maximum background luminance is 3.8×10~5 cd·m^(-2),and the minimum background luminance is6.4×10^(-2)cd·m^(-2).The designed light source system can meet the requirements for simulating the stellar map with a sky background.

关键词： Adjustable background Controllable magnitude Multi-Star simulator Light source

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Research on Energy Storage Capacity Configuration Method and Performance Evaluation in New Energy Base

Research on Energy Storage Capacity Configuration Method and...

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2022 Asia Power and Electrical technology Conference, APET 2022

作者： Zhang, Ruoyu Wang, Liangyou Sun, Changping Le, Bo Wang, Mian Cui, Kangsheng Institute of Science and Technology China Three Gorges Corporation Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Beijing China

ISBN: (纸本)9781665453349

In order to improve the power output stability and frequency stability when large-scale new energy is integrated into the grid, large-scale new energy base must consider the configuration of energy storage systems with a certain capacity. Facing the demand under the background of new energy development, this paper analyzes the positive impact of energy storage to new energy base. The configuration method of energy storage capacity is proposed, and furthermore, the proposed method is used to calculate the capacity of the energy storage system required to be configured in a typical new energy base, and the power suppression and stability improvement effects brought by the energy storage are evaluated. The case analysis results show that the required energy storage capacity of a new energy base is about 10% of its total wind power and photovoltaic capacity. This configuration ratio can basically achieve the stability of the new energy output fluctuation, and at the same time provides the same frequency regulation capability with conventional generator set of equal capacity. © 2022 IEEE.

关键词： Energy storage

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An Architectural Approach for Capability Mapping and Gap Analysis

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Journal of systems science and Information 2013年第1期1卷 86-96页

作者： Kewei YANG Bingfeng GE Qingsong ZHAO Jiang JIANG Science and Technology on Complex Systems Simulation Laboratory National University of Defense Technology College of Information System and Management

To cope with the increasing complexity and constantly changing capability requirements of system-of-systems, an architectural approach for capability mapping and gap analysis is ***, a more specific architecture framework is presented. Secondly, on the basis of the analysis of the semantic relationships between constituent architecture data elements, a capability mapping approach is proposed to manage the relations between capabilities and systems based on the mapping matrixes representing associations of core entities. Then, a four-step capability mapping process for the mapping from capabilities to systems is suggested. Moreover, the capability gap analysis on how to identify and fill the capability gaps is also studied. Finally, an example of specific Net-Centric Warfare mission of Precision Engagement is used to illustrate the feasibility of the approach.

关键词： system-of-systems capability architecture description mapping matrixes core entities gap analysis

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Multibeam antenna pointing measurement based on communication beams for communication satellites

Multibeam antenna pointing measurement based on communicatio...

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62nd International Astronautical Congress 2011, IAC 2011

作者： Chen, Dong Liu, Naijin Ma, Jing China Academy of Space Technology Institute of Telecommunication Satellite Beijing China Second Academy of China Aerospace Science and Industry Corp. National Key Laboratory of Science and Technology on Missile Control System Simulation Beijing China

ISBN: (纸本)9781618398055

With the technical development of the communication satellites and the wide application of multibeam antennas, antenna pointing control problem is becoming increasingly important. The traditional pointing measurement utilizes several beams, which occupies lots of satellite resources. In this paper, a maximum likelihood estimation of the antenna pointing based on communication beams is proposed, which reduce the antenna pointing measurement requirements on satellite. The estimation performance is analyzed which gives the pointing measurement precision and error distribution. The pointing error is composed of calibration error and estimation error, while the pointing error follows normal distribution. simulation results show that the precision improvement slows down due to the calibration error when SNR is greater than 20dB, and the worst precision is better than 0.1°(3δ). Moreover, the performance is largely affected by channel stability when the uncertainty is greater than 1dB(σ) in our simulation. Considering the effects on pointing measurement accuracy of the channel stability, an improved robust method is given in our discussion. It utilizes another beacon beam to calibrate the pointing measurement results, which can eliminate the performance descent due to the channel uncertainty. simulation shows that this improved method is insensitive to the channel stability and can provide a stable pointing measurement performance similar to the traditional method. Copyright©2011 by China Academy of Space technology (CAST). Published by the IAF, with permission and released to the IAF to publish in all forms.

关键词： Calibration

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Affinity Propagation for Hyperspectral Band Selection 2

Affinity Propagation for Hyperspectral Band Selection

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2018 2nd International Symposium on Resource Exploration and Environmental science, REES 2018

作者： Ren, Zhiwei Wu, Lingda Department of Graduate Management Space Engineering University Beijing101416 China Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing101416 China

Because hyperspectral images have the characteristics of high correlation between bands and strong information redundancy, the reduction in dimension of hyperspectral images is an important step in the pre-processing of hyperspectral images. Band selection can preserve the physical meaning of the original data while reducing dimension and has application in many aspects. Affinity Propagation Clustering (AP) is a clustering method proposed by Fray et al. in 2007. AP clusters based on the correlation between data points and treats all data points as potential cluster centers. This paper proposes a band selection method based on AP clustering, which introduces wavelet transform into the calculation of similarity and preference value in clustering algorithm. The dimensionality reduction results are input into the minimum distance classifier for classification, and the classification accuracy was calculated. The dataset is validated by the Indiana Pines dataset. The experimental results verify the effectiveness of the proposed method. © Published under licence by IOP Publishing Ltd.

关键词： Wavelet transforms

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