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International Conference on Information science and Control Engineering (ICISCE)

作者： Menglong Lin Shuanghui Yi Mengmeng Zhang Zhen Shu Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology Changsha China National Key Laboratory for Complex System Simulation Beijing China

In recent years, the development and deployment of the U.S. weapon equipment systems-of-systems (SoS) have yielded rich research results. However, there are still large gaps in the SoS development, joint testing, and design and acquisition of our own equipment SoS. The barriers of these steps have not yet been opened up. This article mainly analyzes the solutions of the U.S. weapon equipment SoS from three aspects, such as capability-based requirement generation and architecture design technology, interconnected-oriented integration test technology, and weapon equipment design and acquisition technology based on complex adaptive systems. We explore key technologies involved in order to form an overall understanding and explore related research approaches.

关键词： Technological innovation Adaptive systems Weapons Agent-based modeling Planning Sustainable development system analysis and design

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Compressive Measurement Identification of Linear Time-Invariant system Application in DC Motor

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Journal of Beijing Institute of technology 2019年第3期28卷 399-409页

作者： Peng Qiu Qian Dong Mingqian Li Guangjie Zhai Xueyan Wang Key Laboratory of Electronics and Information Technology for Space System National Space Science CentreChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Information Science and Technology University Beijing 100192China

In traditional system identification (SI), actual values of system parameters are concealed in the input and output data;hence, it is necessary to apply estimation methods to determine the parameters. In signal processing, a signal with N elements must be sampled at least N times. Thus, most SI methods use N or more sample data to identify a model with N parameters;however, this can be improved by a new sampling theory called compressive sensing (CS). Based on CS, an SI method called compressive measurement identification (CMI) is proposed for reducing the data needed for estimation, by measuring the parameters using a series of linear measurements, rather than the measurements in sequence. In addition, the accuracy of the measurement process is guaranteed by a criterion called the restrict isometric principle. simulations demonstrate the accuracy and robustness of CMI in an underdetermined case. Further, the dynamic process of a DC motor is identified experimentally, establishing that CMI can shorten the identification process and increase the prediction accuracy.

关键词： system identification (SI) compressive sensing (CS) signal measurement linear time-invariant (LTI) system

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Reshaped Weyl fermionic dispersions driven by Coulomb interactions in MoTe2

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Physical Review B 2022年第4期105卷 045143-045143页

作者： Seoung-Hun Kang Sangjun Jeon Hyun-Jung Kim Wonhee Ko Suyeon Cho Se Hwang Kang Sung Wng Kim Heejun Yang Hyo Won Kim Young-Woo Son Korea Institute for Advanced Study Seoul 02455 Korea Department of Physics Chung-Ang University Seoul 06974 Korea Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany Samsung Advanced Institute of Technology Suwon 16678 Korea Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Korea Department of Energy Science Sungkyunkwan University Suwon 16419 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor the shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals.

关键词： Electronic structure First-principles calculations Quasiparticles & collective excitations Topological materials Weyl fermions Scanning electron microscopy Scanning tunneling spectroscopy

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CIBER 4th flight fluctuation analysis: Pseudo-power spectrum formalism, improved source masking and validation on mocks

arXiv

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arXiv 2025年

作者： Feder, Richard M. Bock, James J. Cheng, Yun-Ting Cooray, Asantha Korngut, Phillip M. Matsuura, Shuji Nguyen, Chi H. Takimoto, Kohji Zemcov, Michael California Institute of Technology 1200 E California Blvd 91125 United States Berkeley Center for Cosmological Physics University of California BerkeleyCA94720 United States Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics and Astronomy University of California IrvineCA92697 United States School of Science and Technology Kwansei Gakuin University Hyogo Sanda669-1337 Japan Department of Solar System Sciences Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Center for Detectors School of Physics and Astronomy Rochester Institute of Technology 1 Lomb Memorial Drive RochesterNY14623 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States

Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broad-band intensity mapping measurements. In this paper we detail improvements in methodology for the Cosmic Infrared Background ExpeRiment (CIBER), concentrating on flat field errors and source masking errors. In order to bypass the use of field differences, which mitigate flat field errors but reduce sensitivity, we characterize and correct for the flat field on pseudo-power spectra, which includes both additive and multiplicative biases. To more effectively mask point sources at 1.1 µm and 1.8 µm, we develop a technique for predicting masking catalogs that utilizes optical and NIR photometry through random forest regression. This allows us to mask over two Vega magnitudes deeper than the completeness limits of 2MASS alone, with errors in the shot noise power remaining below © 2025, CC BY.

关键词： Cosmology

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Experimental Demonstration of Delay-Bounded Wireless Network Based on Precise Time Synchronization

arXiv

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arXiv 2022年

作者： Tanaka, Haruaki Yamasaki, Yusuke Yasuda, Satoshi Shiga, Nobuyasu Takizawa, Kenichi Chauvet, Nicolas Horisaki, Ryoichi Naruse, Makoto Department of Information Physics and Computing Graduate School of Information Science and Technology The University of Tokyo Tokyo113-8656 Japan Space-Time Standards Laboratory Electromagnetic Standards Research Center Radio Research Institute National Institute of Information and Communications Technology Koganei184-8795 Japan Sustainable Ict System Laboratory Resilient Ict Research Center Network Research Institute National Institute of Information and Communications Technology Sendai980-0812 Japan

Low latency and reliable information transfer are highly demanded in fifth generation (5G) and beyond 5G wireless communications. A novel delay-bounded wireless media access control (MAC) protocol called Carrier Sense Multiple Access with Arbitration Point (CSMA/AP) was established to strictly ensure the upper boundary of communication delay. CSMA/AP enables collision-free and delay-bounded communications with a simple arbitration mechanism exploiting the precise time synchronization achieved by Wireless Two-Way Interferometry (Wi-Wi). Experimental demonstration and proving the feasibility in wireless environments are among the most critical steps before any further discussion of CSMA/AP and extension to various applications can take in place. In this work described in this paper, we experimentally demonstrated the fundamental principles of CSMA/AP by constructing a star-topology wireless network using software-defined radio terminals combined with precise time synchronization devices. We show that CSMA/AP was successfully operated, even with dynamic changes of the spatial position of the terminal or the capability to accommodate mobility, thanks to the real-time adaption to the dynamically changing environment byWi-Wi. We also experimentally confirmed that the proposed CSMA/AP principle cannot be executed without Wi-Wi, which validates the importance of precise time synchronization. This study paves the way toward realizing delay-bounded wireless communications for future low-latency and highly reliable critical applications. Copyright © 2022, The Authors. All rights reserved.

关键词： Wireless networks

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Fault Detection Method for Insulators Using Improved YOLOv4

Journal of Network Intelligence

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Journal of Network Intelligence 2022年第4期7卷 818-834页

作者： Zhao, Li-Quan Jiang, Zi-Cong Teng, Zi-Ming Jia, Yan-Fei Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University 168 Changchun Road Jilin132012 China Graduate school of Information Science and Electrical Engineering Kyushu University Fukuoka819-0395 Japan College of information and communication Jilin University Changchun130012 China School of Electrical and Information Engineering Beihua University Jilin132013 China

A defective insulator detection method based on improved You Only Look Once version 4 (YOLOv4) is proposed to improve the precision of defective insulator detection. This method designs a dual-branch attention block by simulating the attention process of the human eye, and introduces it into the backbone of YOLOv4 to extract richer information on defective insulator features. To make the output feature map of shallow layer network fuse more different scale features, a path aggregation network has been designed. To improve detection accuracy, the spatial pyramid pooling has been replaced by atrous spatial pyramid pooling. A dynamic non-maximum suppression method is proposed to improve defective insulator detection accuracy. It employs an adaptive threshold control strategy and weighted operation to full use of the predicted box. We compare our method with defective insulator detection methods based on YOLO and R-CNN. Our simulation results show that the proposed method is more accurate than defective insulator detection methods based on YOLO, and has a faster detection speed than methods based on R-CNN. Compared with the defective insulator detection method based on R-CNN that has the highest mean average precision, the mean average precision of the proposed method is lower, but its detection speed is faster. Compared with YOLOv4, its detection speed is slower, but the mean average precision is higher. The proposed method strikes a satisfactory tradeoff between detection speed and mean average precision. © 2022, Taiwan Ubiquitous Information CO LTD. All rights reserved.

关键词： Object detection

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Design and Experimental Validation of Sealing Assembly for Lunar Regolith Volatile Extraction Heating Furnace

Design and Experimental Validation of Sealing Assembly for L...

引用

IEEE International Conference on Robotics and Biomimetics

作者： Hongan Zhang Junyue Tang Yinchao Wang Zixiao Lu Bo Wang Miaoyan Cao Shengyuan Jiang Mechanical Engineering Yanshan University Qinhuangdao P. R. China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin P. R. China Mechatronics Institute Shenyang Aerospace University Shenyang P. R. China National Center for Nanoscience and Technlogy Chinese Academy of Science Beijing P. R. China China Academy of Space Technology Beijing P. R. China

A lunar regolith in-situ analysis payload deploying a mass spectrometer is proposed to exactly detect the water ice of the South Pole of the moon for China future lunar exploration missions. In order to realize the goal, an airtight heating furnace for volatile extraction from lunar regolith is desired. In this paper, sealing methods for lunar regolith volatile in heating furnace to future proposed in-situ sampling and analysis of lunar samples were investigated based on power requirements, furnace closing accuracy requirements, dust tolerance and operation in the Lunar environment. Methods implemented include a balanced metal hollow ring seal, a double channel ferrule tab ring radial seal and a spring energized seal. Comparing the performance of sealing methods under the above conditions, a spring energized seal is selected as the heating furnace seal. The materials and structure of the seal are designed based on the rigidity requirements, leakage rate requirements and working environment requirements. In order to test the sealing performance of seals after repeated sealing in high and low temperature environments, a seal leak detection system was designed. The test results indicate that the seal can meet the sealing performance requirements after repeated sealing at various temperatures.

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Research on the impact of extraterrestrial lava tube environments on human survival and countermeasures

Space Habitation

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space Habitation 2025年第1期1卷

作者： Xingyang She Jiang Wang Weiyang Xu Long Xiao Planetary Science Institute School of Earth Sciences China University of Geosciences Wuhan China Aerospace System Engineering Shanghai Shanghai 201109 China State Key Laboratory of Lunar and Planetary Sciences Space Science Institute Macau University of Science and Technology Macao

Lava tubes, formed by the flow and cooling of volcanic lava, have been discovered on the surfaces of multiple celestial bodies within the solar system. Due to their excellent protection against meteorite impacts, radiation shielding, and stable temperatures, they are considered one of the ideal locations for future extraterrestrial bases. However, achieving long-term human survival in extraterrestrial lava tube environments still faces numerous risks and challenges. The interiors of natural lava tube caves often contain rubble and cracks, requiring pre-treatment work. The vacuum environment is extremely unfavorable for human survival, necessitating sealing and pressurization inside the lava tubes. The caves are in a state of permanent darkness, requiring long-term lighting solutions. While the cave roofs provide shielding from space radiation, they also attenuate radio signals emitted from within. Additionally, long-term survival in enclosed spaces can have negative impacts on both physical and psychological health. Only by comprehensively considering these challenges and adopting appropriate technologies and solutions can humans truly achieve long-term survival and development in extraterrestrial spaces. This paper proposes strategies for utilizing lunar and Martian lava tube caves, focusing on cave treatment and pressurization, lighting and energy supply, communication technologies, and habitation systems, to enable long-term human survival in extraterrestrial environments.

关键词： Lava Tubes Moon Mars Extraterrestrial Bases Risks and Countermeasures

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An Anti-Interference Chaotic Scheme for Cognitive Radio

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Wuhan University Journal of Natural sciences 2020年第5期25卷 435-444页

作者： DUAN Junyi YANG Hua Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuChina Nanjing Institute of Railway Technology Nanjing 210031JiangsuChina School of Electronic Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina

Chaotic sequence has been applied in Cognitive Radio(CR)to exert the enormous potential spectral utilization and enhance the transmission ***,since there is not strict orthogonality between chaotic signals,intra-signal interference(ISI)will be introduced into the ***,an anti-interference orthogonal-frequency-division-multiplexing(OFDM)chaotic modulation named Walsh-sequence chaotic CR(WS-CCR)is proposed for cognitive *** constructing the strictly orthogonal chaotic signal based on Walsh sequence,the ISI component,which is produced by frequency offset in previous CR,can be eliminated during the ***,the chaotic sequence can also be applied to scramble subcarriers to relieve the interference caused by malicious *** approximation method is adopted to obtain the exact performance analysis of WS-CCR over Additive White Gaussian Noise(AWGN)channel and Rayleigh multipath fading *** show that,with subcarriers scrambling by chaotic sequence,anti-interference performance and transmitting security can be signi?cantly improved in ***,due to the absence of ISI component,the bit-error ratio(BER)performance of WS-CCR is better than that of the previous CR system.

关键词： chaotic cognitive radio Walsh-sequence subcarriers scrambling

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Survival of the magnetotactic bacterium Magnetospirillum gryphiswaldense exposed to Earth’s lower near space

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science Bulletin 2022年第13期67卷 1335-1339,M0003页

作者： Jia Liu Wensi Zhang Kuang He Li Liu Chao Wang Yuanda Jiang Shijiao Ma Jiesheng Tian Ying Li Tongwei Zhang Lanxiang Tian Fei He Greig APaterson Yong Wei Yongxin Pan Wei Lin Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China France-China Joint Laboratory for Evolution and Development of Magnetotactic Multicellular Organisms Chinese Academy of SciencesBeijing 100029China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting Techniques(Ministry of Education)College of Marine GeosciencesOcean University of ChinaQingdao 266100China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Electronics and Information Technology for Space Systems National Space Science CenterChinese Academy of SciencesBeijing 100190China State Key Laboratories for Agro-biotechnology College of Biological SciencesChina Agricultural UniversityBeijing 100193China Department of Earth Ocean and Ecological SciencesUniversity of LiverpoolLiverpool L697ZEUK

地球临近空间指海平面之上20~100 km高度区域,具有高辐射、低温、干燥、低气压等极端条件,是一类典型的类火星环境.研究生命在临近空间的存活机制有助于深化对火星宜居性和生命探测的认识.本研究利用自主研发的临近空间天体生物学载荷... 详细信息

地球临近空间指海平面之上20~100 km高度区域,具有高辐射、低温、干燥、低气压等极端条件,是一类典型的类火星环境.研究生命在临近空间的存活机制有助于深化对火星宜居性和生命探测的认识.本研究利用自主研发的临近空间天体生物学载荷和飞行实验平台,将趋磁细菌Magnetospirillum gryphiswaldense MSR-1带入23 km高度区域开展生物暴露实验.结果发现合成磁小体的趋磁细菌经过7小时16分钟的暴露后仍有部分细胞存活,而不合成磁小体的菌株经过暴露后没有检测到存活细胞;临近空间暴露后存活的样品与实验室对照组相比,其磁小体的数量、尺寸和岩石磁学性质等均发生变化.这些结果表明细胞内的磁小体纳米颗粒有助于趋磁细菌抵御临近空间的高辐射等极端环境,为趋磁细菌的起源和早期演化、生命适应类火星极端环境的机制等提供了新认识.鉴于趋磁细菌具有在类火星环境中生存的潜力,这些感磁微生物可以作为天体生物学研究的重要生物类群.

关键词：天体生物学极端环境极端条件生命探测趋磁细菌磁小体临近空间宜居性

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