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High-resolution waveguide array-based astronomical spectrograph with cascaded phase modulation

Chinese Optics Letters 2025年第3期23卷 031301-031301页

作者： Zhong, Yunxian Lin, Dong Xu, Biao Zhu, Zhuangzhuang Tong, Xue Zhong, Qing Feng, Jijun He, Jinping Laboratory of Solar and Space Instruments Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing210042 China Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences CAS Key Laboratory of Astronomical Optics & Technology Nanjing210042 China University of Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Nanjing211135 China Shanghai Key Laboratory of Modern Optical System Engineering Research Center of Optical Instrument and System Ministry of Education University of Shanghai for Science and Technology School of Optical-Electrical and Computer Engineering Shanghai200093 China

Integrated photonic spectrographs could provide a new generation of low-cost, highly integrated, high-performance optical terminal instruments for astronomical observations. However, these spectrographs still face the challenge of high spectral resolution. In this Letter, we demonstrate a cascaded phase-modulated waveguide array (CPMWA) spectrograph, with designed and measured spectral resolutions of 100,000 and 68,000, respectively. A spectral reconstruction method is proposed to minimize the influence of the phase error induced during the chip fabrication process and increase the spectral contrast to 20 dB. This type of spectrograph demonstrates promising potential for high-resolution spectrum observations in astronomy. © 2025 Chinese Optics Letters.

关键词： Spectral resolution

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Dual-Polarized Wideband Wide-Beam Millimeter-Wave Magneto-Electric Dipole Antenna

Dual-Polarized Wideband Wide-Beam Millimeter-Wave Magneto-El...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Gou, Linglong Ma, Jing Shi, Bin Zhu, Zhongbo Peng, Lin Guilin University of Electronic Technology Key Laboratory of Microwave and Optical Wave Application Technology Guangxi Guilin541004 China Beijing Simulation Center The Science and Technology on Special System Simulation Laboratory Beijing100854 China The National Key Laboratory of Science and Technology on Space Microwave Xi'an710100 China

ISBN: (纸本)9798350358971

In this manuscript, a dual-polarized wideband wide beamwidth magneto-electric (ME) dipole antenna for millimeter-wave mobile communication is proposed. As can be seen from the simulation results, this design exhibits excellent performance. Owing to the mutual resonances of the magnetic dipole and the electric dipole, large bandwidths of 64.8% and 59% (18.4 GHz-33 GHz and 17.29 GHz-33.9 GHz) are obtained for the two polarizations, respectively. The isolation between the two ports is greater than 25 dB. By loading metal vias, the antenna's beamwidth is widened to more than 100° through the whole operating band. The antenna size is 5mm×5 mm ×1.72 mm, and this compact structure is quite suitable for using in beam scanning antennas. © 2023 IEEE.

关键词： dual-polarization millimeter-wave (mm-wave) wideband

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Stable Periodic Frequent Itemset Mining on Uncertain Datasets 4

Stable Periodic Frequent Itemset Mining on Uncertain Dataset...

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4th IEEE International Conference on Computer and Communication Engineering technology, CCET 2021

作者： He, Ruimeng Chen, Jinchao Du, Chenglie Duan, Yuxin Northwestern Polytechnical University Department of Computer Science Xi'an China Science and Technology on System Simulation Laboratory Beijing Simulation Center Beijing China

ISBN: (纸本)9781665438902

In recent years, data mining has attracted great attention from the information industry. The main reason is that there is a large amount of data, which can be widely used, and there is an urgent need to convert these data into useful information and knowledge. Frequent itemset mining as an important research basis in data mining research has also been greatly developed. However, most of these frequent itemset mining algorithms only consider the frequency of itemsets and ignore the periodicity of itemsets, which makes the results incomplete. In order to solve the above problem, this paper presents a a stable periodic frequent itemset mining (SPFIM) algorithm on uncertain dataset, by considering both the frequency and periodicity of itemsets. The experimental evaluation on real datasets shows that the SPFIM algorithm is efficient and can find patterns that are not found by traditional algorithms. © 2021 IEEE.

关键词： Data mining

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system of systems complexity and decision making

System of systems complexity and decision making

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2012 7th International Conference on system of systems Engineering, SoSE 2012

作者： Zhang, Yingchao Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781467329750

Complexity in system of systems (SoS) is a key factor in SoS decision making. This paper analyzes the main characteristics of SoS, especially its complexity in terms of monolithic emergence, component systems adaption and uncertainty in SoS evolution. It further discusses the effects of SoS complexity on SoS decision making. In light of SoS complexity, the paper figures out the major problems that need to be addressed in four areas, namely SoS adaption, abnormity analysis in SoS evolution, exploratory analysis of SoS capability and SoS simulation. In conclusion the paper proposes a preliminary SoS decision making model based on the analysis of SoS adaption. © 2012 IEEE.

关键词： system of systems

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A generation algorithm of Latin hypercube sampling based on original sampling points 27

A generation algorithm of Latin hypercube sampling based on ...

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27th European Modeling and simulation Symposium, EMSS 2015

作者： Liu, Zhizhao Li, Wei Yang, Ming Xu, Jun Qing, Duzheng Control and Simulation Center Harbin Institute of Technology Harbin150080 China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China

ISBN: (纸本)9788897999485

In order to utilize original sampling points as many as possible to construct a Latin Hypercube Sampling (LHS), a generation algorithm of LHS is proposed. The original sampling can be an arbitrary sampling and the new sampling is a LHS strictly. As the high structure of LHS, only part of original sampling points can be used for LHS. There are several problems including how to select the reserved original sampling points and generate the new ones if necessary. Matrices are used to describe the original sampling points and the original sampling points are reserved based on an adjacent matrix. The new sampling points are generated by a subtraction rule. Numerical experiments show that the generation algorithm is effective and saves a lot of running time for simulation systems.

关键词： Geometry

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Application of high frequency scattering predication method in MMWSS

Application of high frequency scattering predication method ...

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2012 International Conference on Microwave and Millimeter Wave technology, ICMMT 2012

作者： Nie, J.K. Guo, L.X. Zhao, H. Ma, J. Fei, J.D. School of Science Xidian University Xi'an Shaanxi 710071 China Key Laboratory on Space System Simulation Beijing Simulation Center Beijing 100854 China

ISBN: (纸本)9781467321839

A radiation model of millimeter wave antenna is established in this paper. The electromagnetic field distribution on the seeker antenna is calculated in MMWSS based on PO method. According the numerical results, when target is in the near-field of antenna, the characteristic of echo amplitude has an obvious effect of multi-scattering points effect. © 2012 IEEE.

关键词： Millimeter waves

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A theme-oriented data automatic organization method

A theme-oriented data automatic organization method

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2014 International Conference on Applied sciences, Engineering and technology, ICASET 2014

作者： Cao, Rui Hao, Li Yun Wu, Ling Da Science and Technology on Complex Electronic System Simulation Laboratory Equipment Academy Beijing 101416 China

ISBN: (纸本)9783038351849

In order to automatic organization data according to customers' requirement, and improve the data reusability, an idea of data meta-component is proposed, the definition of data meta-component is present, the model of data meta-component is established. A theme-oriented data automatic organization method is proposed;on the basis of data mete-component, the theme domain data automatic organization is realized by means of nature language processing, semantic query, association analysis, share distribution, and other technologies;experimental results show that this method is feasible and effective. © (2014) Trans Tech Publications, Switzerland.

关键词： Reusability

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Architecture transformation research on joint border defense systems-of-systems 2021

Architecture transformation research on joint border defense...

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2021 5th International Conference on Management Engineering, Software Engineering and Service sciences, ICMSS 2021

作者： Zhang, Mengmeng Yi, Shuanghui Lin, Menglong Chen, Honghui Science and Technology on Information Systems Engineering Laboratory China National Key Laboratory for Complex System Simulation China

ISBN: (纸本)9781450389709

Currently, with the deepening of development and open of China's border, issues of border joint defense become increasingly arduous. Traditional means of cooperation and coordination are far from being able to align requirements;information systems of different joint defense units are difficult to interconnect and interoperate;the previous results of joint defense informatization are difficult to inherit. The main reason is the lack of border joint defense information construction with a top-level design approach. Via the lens of top-level design, this paper establishes a multi-viewpoint architecture framework and transformation process, develops the as-is and to-be joint defense architecture, and finally analyzes transformation principles from the as-is architecture to to-be architecture. This paper mainly explores the architecture transformation mechanisms under the border joint defense scenario. © 2021 ACM.

关键词： Architecture

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NASIL: Neural Network Architecture Searching for Incremental Learning in Image Classification 1

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11th International Symposium on Parallel Architectures, Algorithms and Programming, PAAP 2020

作者： Fu, Xianya Li, Wenrui Chen, Qiurui Zhang, Lianyi Yang, Kai Qing, Duzheng Wang, Rui Beihang University Beijing China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China

ISBN: (数字)9789811600104

ISBN: (纸本)9789811600098

"Catastrophic forgetting" and scalability of tasks are two major challenges of incremental learning. Both of these issues were related to the insufficient capacity of machine learning model and the insufficiently trained weights as the increasing of tasks. In this paper, we try to figure out the impact of the neural network architecture to the performance of incremental learning in the case of image classification. During the increasing of tasks, we propose to use neural network architecture searching (NAS) to find a structure that fits the new tasks collection better. We build a NAS environment with reinforcement learning as the searching strategy and Long Short-Term Memory network as the controller network. Computation operation and connecting previous nodes are selected for each layer in the search phase. For each time a new group of tasks is added, the neural network architecture is searched and reorganized according to the training data set. To speed up the searching, we design a parameter sharing mechanism, in which the same building blocks in each layer share a group of parameters. We also introduce the quantified-parameter building blocks into the NAS, to identify the best candidate during each round of searching. We test our solution in cifar100 data set, the average accuracy outperforms the current representative solutions (LwEMC, iCaRL, GANIL) by 24.92%, 5.62%, and 3.6%, respectively, the more tasks added, the better our solution performs. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Network architecture

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Pin-Tool based execution backtracking 13th

Pin-Tool based execution backtracking

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13th Conference on Advanced Computer Architecture, ACA 2020

作者： Wei, Shuangjian Ji, Weixing Chen, Qiurui Wang, Yizhuo Beijing Institute of Technology Beijing100081 China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing100854 China

ISBN: (纸本)9789811581342

Checkpoint/restart is a common fault tolerant technique which periodically dump state to reliable storage and restart applications after failure. Most of existing checkpoint/restart implementations only handle volatile state and lack of support for persistence state of applications. Even the algorithm specifically designed for file checkpointing may not support complex operations and some need to modify source code. This paper presents a new checkpoint technique, which use dynamic instrumentation to temporarily cache disk operations in memory, and use existing memory checkpoint tool to dump or restore process state at runtime. We show that not only can this method create regular checkpoints for both volatile and persistence state, but also has important applications in execution backtracking. © Springer Nature Singapore Pte Ltd 2020.

关键词： Cache memory

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