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6th Annual IEEE Research and Applications of Photonics in Defense Conference, RAPID 2023

作者： Li, A. Jiahe Zhu, B. Chen Kinzel, C. Ed Almasri, D. Mahmoud Anderson, E. Derek University of Missouri Department of Electrical Engineering and Computer Science ColumbiaMO65211 United States University of Notre Dame Department of Aerospace and Mechanical Engineering Notre DameIN46556 United States

This study explores machine learning for microbolometer design, evaluation, and selection. A neural net predicts material mixtures for a single pixel using a simulation that predicts multispectral responses relative t... 详细信息

ISBN: (纸本)9781665423526

关键词： Temperature sensors

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A WSN Node Fault Diagnosis Model Based on BRB with Self-Adaptive Quality Factor

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computers, Materials & Continua 2023年第4期75卷 1157-1177页

作者： Guo-Wen Sun Gang Xiang Wei He Kai Tang Zi-Yi Wang Hai-Long Zhu School of Computer Science and Information Engineering Harbin Normal UniversitySongbei DistrictHarbin150025China Beihang University School of Automation Science and Electrical Engineering Beijing100191China Beijing Aerospace Automatic Control Institute Beijing100074China Rocket Force University of Engineering Xi’anShaanxi Province710025China

Wireless sensor networks (WSNs) operate in complex and harshenvironments;thus, node faults are inevitable. Therefore, fault diagnosis ofthe WSNs node is essential. Affected by the harsh working environment ofWSNs and wireless data transmission, the data collected by WSNs containnoisy data, leading to unreliable data among the data features extracted duringfault diagnosis. To reduce the influence of unreliable data features on faultdiagnosis accuracy, this paper proposes a belief rule base (BRB) with a selfadaptivequality factor (BRB-SAQF) fault diagnosis model. First, the datafeatures required for WSN node fault diagnosis are extracted. Second, thequality factors of input attributes are introduced and calculated. Third, themodel inference process with an attribute quality factor is designed. Fourth,the projection covariance matrix adaptation evolution strategy (P-CMA-ES)algorithm is used to optimize the model’s initial parameters. Finally, the effectivenessof the proposed model is verified by comparing the commonly usedfault diagnosis methods for WSN nodes with the BRB method consideringstatic attribute reliability (BRB-Sr). The experimental results show that BRBSAQFcan reduce the influence of unreliable data features. The self-adaptivequality factor calculation method is more reasonable and accurate than thestatic attribute reliability method.

关键词： Self-adaptive quality factor belief rule base wireless sensor networks fault diagnosis

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Frequency Tuning Range Enhancement of a Filtering Patch Antenna 6

Frequency Tuning Range Enhancement of a Filtering Patch Ante...

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6th Australian Microwave Symposium, AMS 2025

作者： Ma, Tianchang Dang, Quoc Hung Fumeaux, Christophe Nguyen-Trong, Nghia Chen, Shengjian Jammy The University of Adelaide School of Electrical and Mechanical Engineering AdelaideSA5005 Australia The University of Queensland School of Electrical Engineering and Computer Science BrisbaneQLD4072 Australia Nextwaves Industries Singapore Flinders University College of Science and Engineering TonsleySA5042 Australia

ISBN: (纸本)9798350379969

A recently proposed low-profile frequency-reconfigurable filtering patch antenna is further optimized to achieve a wider frequency tuning range. The design realizes the filtering functionality using four parasitic strips and two lateral stubs. To achieve frequency-reconfigurability, sets of varactor diodes are integrated on the main patch, parasitic strips, and lateral stubs to vary their electrical length. The extension proposed here for the original design integrates thin copper extension lines with the varactor diodes. These lines bridge the parasitic strips, lateral stubs, and the main patch with their respective tuning elements, which reduces the parasitic parallel capacitance to the varactor diodes. As a result, the proposed evolved design shows a 31.5% frequency tuning range, which is 9.6% wider compared to the original design. © 2025 IEEE.

关键词： Varactors

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Novel Use of Non-Combustible Propellant Analogs for Rapid, Safe, and Low-Cost Cryogenic Bipropellant Rocket Engine Testing

Novel Use of Non-Combustible Propellant Analogs for Rapid, S...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Khalimonov, Oleg Ng, Hoi Dick Department of Mechanical Industrial and Aerospace Engineering Gina Cody School of Engineering and Computer Science Concordia University MontrealQCH3G 1M8 Canada

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

This study explores the novel use of safe, non-combustible propellant analogs for preliminary tests before hot-fire rocket engine testing. Originally developed by the Space Concordia team during the testing of their 35kN keralox bipropellant fuel rocket engine "Stewart," this method addresses issues of cost, logistics, and safety in rocket engine testing. For full-scale rocket engines, safety clear zones, noise restrictions, and handling of propellants like kerosene and liquid oxygen pose significant hurdles for low-budget organizations in urban areas. This method utilizes liquid nitrogen as an analog for liquid oxygen and water or other high heat capacity room-temperature liquids as fuel analogs. These "cryo-flow" tests, common in the industry, obtain key parameters without combustion risks. However, these trials struggle with accurately determining feed system performance and potential cavitation due to low system pressure and lack of combustion backpressure. A new variation of this test resolves the aforementioned problem. By adjusting the throat diameter of the engine, the rapid expansion of the inert cryogen in the combustion chamber post-injection achieves gas velocities of Mach 1 at the throat and can be tuned to match the design chamber pressure of combustion. This innovation allows the full engine system to be safely validated at hot-fire run pressures prior to hot-fire testing, reducing both cost and risk. This paper summarizes the concept of operations, the engine design that was validated with this method, the mobile rocket engine test stand, as well as backpressure cryo data compared to hot-fire data. This comprehensive review provides insights into the practicality and effectiveness of using non-combustible propellant analogs, presenting a significant advancement for resource-limited organizations, as well as cost and time savings for large institutions engaged in rocket engine development. © 2025, American Institute of Aeronautics and Astronautics Inc

关键词： Budget control

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Shared-Aperture Patch Antenna for Energy Harvesting and Wireless Communications 6

Shared-Aperture Patch Antenna for Energy Harvesting and Wire...

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6th Australian Microwave Symposium, AMS 2025

作者： Chen, Junyi Nguyen-Trong, Nghia Fumeaux, Christophe Chen, Shengjian Jammy Nextwaves Industries Singapore The University of Queensland School of Electrical Engineering and Computer Science BrisbaneQLD4072 Australia The University of Adelaide School of Electrical & Mechanical Engineering AdelaideSA5005 Australia Flinders University College of Science and Engineering TonsleySA5042 Australia

ISBN: (纸本)9798350379969

A shared-Aperture patch antenna for simultaneous RF energy harvesting and wireless communications is proposed. Diodes are integrated into the antenna to convert RF energy into DC power and the diode-To-Antenna matching is done through antenna geometry optimization. As a result, the design requires no additional rectifier circuit and matching network. The communications mode is designed to be orthogonally polarized to the energy harvesting mode to improve the isolation. © 2025 IEEE.

关键词： PIN diodes

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STaaS: Cost Effective and Scalable Union Mounting in ICP for aerospace Applications

STaaS: Cost Effective and Scalable Union Mounting in ICP for...

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2024 International Conference on Green Energy, Computing and Sustainable Technology, GECOST 2024

作者： Sakthivel, V. Li, Jueying Rama Abirami, K. Min, Dugki Lee, Jae Woo Choi, Eunmi School of Computer Science and Engineering Vellore Institute of Technology Chennai India Konkuk University Department of Computer Science and Engineering Seoul Korea Republic of Curtin University Department of Electrical and Computer Engineering Malaysia Konkuk Aerospace Design - Airworthiness Institute Konkuk University Seoul Korea Republic of Kookmin University Department of Computer Science and Engineering Seoul Korea Republic of

ISBN: (纸本)9798350357905

Cloud computing widely used in various specific areas leads to the emergence of 'Short-Time as a Service' (STaaS) as a cost-effective and scalable way for enterprises and organizations to access and utilize computing resources. Union mounting, a method that enables multiple file systems to be combined into one virtual file system, has been proposed as a strategy to optimize STaaS by allowing resources to be allocated dynamically based on user requirements. This research paper explores the feasibility and benefits of STaaS with the union mounting method, using a project providing a simulation environment on the Industry Cloud Platform (ICP) for the aerospace organization that requires an environment that can automatically and quickly create cluster groups of Cloud In the Loop Simulation (CILS) for Unmanned Aerial Vehicle (UAV) operations. The results demonstrate that STaaS with a union mounting method can provide significant benefits in terms of CILS cluster group creation, performance optimization, and flexibility. Specifically, our proposed research could reduce instance creation time costs by up to 90% compared to the traditional creation method. Overall, STaaS with union mounting method improves the creation time of the CILS cluster group for the aerospace organization requiring flexibility and cost-effectiveness. © 2024 IEEE.

关键词： Antennas

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Study on Paper Drying Rate Based on Lattice Boltzmann Method

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2022年第1期54卷 10-17页

作者： Yan, Yan Jiangli, Pan Jixian, Dong Jian, Sun College of Mechanical & Electrical Engineering Xi’an Polytechnic University Xi’an710600 China College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China College of Mechanical & Electrical Engineering Shaanxi University of Science & Technology Xi’an710021 China

The lattice Boltzmann method and the law of conservation of kinetic energy were used to simulate and analyze moisture transfer during the drying process. The effects of paper porosity, paper basis weight, drying temperature and hot air velocity on the drying characteristic curve were investigated. The results show that porosity has a strong influence on the drying characteristic curve in the constant drying stage but less of an influence in the falling rate drying stage. Different paper basis weights have a significant effect on drying characteristics. The greater the weight is, the longer the drying time is. Increasing the drying temperature and hot air velocity could shorten the drying time, but the effect became weaker as these parameters were increased. These results indicated that the drying efficiency cannot be significantly improved by increasing the temperature and flow rate. © 2022 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Porous materials

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Arbitrary acoustic orbital angular momentum detection using dual-layer metasurfaces

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science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 106-112页

作者： Zhanlei Hao Haojie Chen Yuhang Yin Shan Zhu Yadong Xu Cheng-Wei Qiu Huanyang Chen Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Department of Mechanical and Electrical Engineering Xiamen UniversityXiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China School of Physical Science and Technology and Jiangsu Key Laboratory of Thin Films Soochow UniversitySuzhou 215006China

Orbital angular momentum(OAM),with its unique physical properties and vast application prospects,has attracted widespread attention in various ***,the development of valid and practical acoustic OAM detection methods continues to be a challenging *** this paper,we propose a novel construction method of dual-layer metasurfaces to achieve a doubleconversion process for the waveform reshaping and differentiated focusing of two-dimensional vortex sources with different ***,by utilizing a concise formula,a one-to-one correspondence is established between the OAM of incident vortex waves and different imaging *** fundamental principle of this special conversion relationship is rigorously constrained by the directional compensation of phase and the material parameters of dual-layer metasurfaces with different quadratic phase *** importantly,the highly consistent results between numerical demonstrations and acoustic experiments further confirm the feasibility and effectiveness of the proposed OAM detection *** work provides a new perspective on the precise manipulation for the phase of vortex fields,holding potential applications in super-resolution imaging and the design of acoustic OAM-based devices.

关键词： arbitrary acoustic OAM detection vortex waves dual-layer metasurfaces waveform reshaping differentiated focusing acoustic experiments

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Optimizing Parachute Payload Delivery through Wind Gust Analysis

Optimizing Parachute Payload Delivery through Wind Gust Anal...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Ho, Franklin D.-K. Lomax, John C. Mueller, Mark W. Department of Mechanical Engineering University of California BerkeleyCA94720 United States Department of Electrical Engineering and Computer Science University of California BerkeleyCA94720 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Precision payload delivery methods currently involve a winch to lower a payload attached to a cable or an actuated parachute with a closed-loop control system to adjust the trajectory of the payload. We propose a novel, entirely passive parachute-deployed payload delivery system that overcomes the challenges of wind gusts blowing payloads off-course. Preliminary testing indicates that parachutes are capable of landing two meters from a target, while numerical simulations of ideal conditions show a one-meter precision level. In this paper, we propose statistical analysis and time series analysis of wind behavior to account for the stochastic, gusty nature of wind. We also present methods to study the aerodynamic properties of the parachute-payload system and a kinematic analysis of how the parachute moves horizontally and vertically. We also show the theoretical implementation of in-situ wind velocity measurements by extrapolating drone disturbances during flight. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Stochastic systems

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Undergraduate Research Experience Impact on Retention in an electrical engineering and computer science (EECS) Program

Undergraduate Research Experience Impact on Retention in an ...

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2023 Congress in computer science, computer engineering, and Applied Computing, CSCE 2023

作者： Salmani, Hassan Mosleh, Mohsen Washington, Gloria Department of Electrical Engineering and Computer Science WashingtonDC United States Department of Mechanical Engineering WashingtonDC United States

ISBN: (纸本)9798350327595

Research has demonstrated the positive influence of Undergraduate Research Experience (URE) programs in science, Technology, engineering, and Mathematics (STEM) on students' educational journey and their development as scientists, ultimately aiding them in making informed career choices. However, traditionally, URE programs have primarily targeted junior and senior students who already possess disciplinary knowledge and exhibit a strong inclination to persist in STEM fields. This study aims to examine the effects of involving freshmen in the Industry-Research Inclusion in STEM Education (I-RISE) program, specifically in the disciplines of electrical engineering (EE) and computer science (CS), on student retention. The I-RISE program integrated research opportunities for undergraduate students with mentorship activities, facilitating the acquisition of relevant skills in applied computing and engineering techniques, research methodologies, and the attainment of internships. Analyzing the retention rates of three distinct cohorts of I-RISE participants over a span of three years revealed significantly higher retention rates compared to students who did not partake in the I-RISE program. © 2023 IEEE.

关键词： Mentoring Retention Undergraduate Research Experience

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