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Accelerating Space Commerce, Exploration, and New Discovery conference, ASCEND 2023

作者： Johnson, Wesley L. Grotenrath, Ryan J. Balasubramaniam, Ramaswamy Chan, Hon Mon Smith, James W. Giddens, Patrick A. Fluid and Cryogenic Systems Branch NASA Glenn Research Center ClevelandOH44135 United States Low Gravity Exploration Technology Branch Case Western Reserve University NASA Glenn Research Center ClevelandOH44135 United States Advanced Systems Development Branch NASA Armstrong Flight Research Center EdwardsCA44135 United States Propulsion Research and Technology Branch NASA Marshall Space Flight Center HuntsvilleAL35812 United States

ISBN: (数字)9781624107054

ISBN: (纸本)9781624107054

As the advancement of In-Situ Resource Utilization concepts and systems continue to develop, applicable technology development and maturation continues in parallel. While there are many different ways to use the resources found on other bodies, one of the most prevalent suggested applications is the manufacturing of propellants. One of the key technologies for the eventual use of these propellant production based ISRU systems is the liquefaction and storage of the produced propellants. The most mentioned propellant combinations include oxygen-hydrogen and oxygen-methane. The liquefaction of oxygen in these systems will be different than that on Earth, which mainly revolves around the distillation of air. These systems have been developed conceptually and many of the components have been previously tested or are in development. However, the need to demonstrate the system level operations still exists. The demonstration of a prototypical oxygen liquefaction system using tube-on-tank broad area cooling was completed to better understanding system level operations during liquefaction activities. Demonstration testing included system performance determination, constant liquefaction demonstrations, and transient liquefaction demonstrations. The demonstrations showed the operational capabilities of the tube-on-tank system with an integrated cryocooler. Additional testing explored subsurface vs ullage introduction of the gaseous oxygen flow stream as well as demonstrating a novel fiber optic sensor that measured the temperature gradients along the fluid center line within the tank. © 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Demonstrations

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Molten Salt Shielded Synthesis of Monodisperse Layered CaZnOS-Based Semiconductors for Piezophotonic and x-Ray Detection applications

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SMALL 2022年第12期18卷 e2107437页

作者： Zheng, Yuantian Li, xu Ma, Ronghua Huang, Zefeng Wang, Chunfeng Zhu, Mingju Du, Yangyang Chen, xian Pan, Caofeng Wang, Bohan Wang, Yu Peng, Dengfeng Shenzhen Univ Coll Phys & Optoelect Engn Key Lab Optoelect Devices & Syst Minist Educ & Guangdong Prov Shenzhen 518060 Peoples R China Shenzhen Univ Coll Mat Sci & Engn Shenzhen 518060 Peoples R China Chinese Acad Sci CAS Ctr Excellence Nanosci Beijing Inst Nanoenergy & Nanosyst Beijing Key Lab Micronano Energy & Sensor Beijing 100083 Peoples R China Shenzhen Univ Inst Microscale Optoelect Int Collaborat Lab 2D Mat Optoelect Sci & Technol Shenzhen 518060 Peoples R China

CaZnOS-based semiconductors are the only series of material system discovered that can simultaneously realize a large number of dopant elements to directly fulfill the highly efficient full-spectrum functionality from ultraviolet to near-infrared under the same force/pressure. Nevertheless, owing to the high agglomeration of the high temperature solid phase manufacturing process, which is unable to control the crystal morphology, the application progress is limited. Here, the authors report first that CaZnOS-based fine monodisperse semiconductor crystals with various doping ions are successfully synthesized by a molten salt shielded method in an air environment. This method does not require inert gas ventilation, and therefore can greatly reduce the synthesis cost and more importantly improve the fine control of the crystal morphology, along with the crystals' dispersibility and stability. These doped semiconductors can not only realize different colors of mechanical-to-optical energy conversion, but also can achieve multicolor luminescence under low-dose x-ray irradiation, moreover their intensities are comparable to the commercial NaI:Tl. They can pave the way to the new fields of advanced optoelectronic applications, such as piezophotonic systems, mechanical energy conversion and harvesting devices, intelligent sensors, and artificial skin as well as x-ray applications.

关键词： CaZnOS doping light emission mechanoluminescence molten salt synthesis

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MZ Core: An Enhanced Matrix Acceleration Engine for HPC/ AI applications 24

MZ Core: An Enhanced Matrix Acceleration Engine for HPC/ AI ...

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24th IEEE International conference on High Performance Computing and Communications, 8th IEEE International conference on Data Science and systems, 20th IEEE International conference on Smart City and 8th IEEE International conference on Dependability in sensor, Cloud and Big Data systems and Application, HPCC/DSS/SmartCity/DependSys 2022

作者： Cao, Yasong Wen, Mei Shen, Junzhong Liu, Sheng Wang, Zhi Tang, Minjin Fang, Yahao Yang, Jianchao Yang, Renyu Kang, Yuhan Fei, Jiawei College of Computer National University of Defense Technology Changsha China Hunan Normal University Software Engineering Changsha China

ISBN: (纸本)9798350319934

The convergence of High-Performance Computing (HPC) and Artificial Intelligence (AI) has become a promising trend. Due to the different computation patterns of HPC and AI applications, it's challenging to design an appropriate architecture to balance their demand. To address this, we propose Matrix Zone (MZ), an enhanced Systolic Array-based matrix engine that accelerates General Matrix Multiplication (GEMM) for both HPC and AI applications. We develop a semi-memory hierarchy to reduce on-chip area consumption and a data stitching method to support multi-precision floating-point processing efficiently. We demonstrate that MZ improves performance for both HPC and AI applications significantly. For AI-GEMM tasks, the performance of MZ is 1.80x (FP32), 15.11x (FPI6), and 3.48x (FPI6-FP32) of the TPU-like model on average, respectively. MZ's performance is more than 10.29x (FP32) and 26.37x (FPI6) of the HPC core in Convolutional (CONV) layers on average, and it is 4.66x (FP32) and 20.75x (FPI6) in Fully Connected (FC) layers on average. For HPC-GEMM tasks, the HPC core + MZ is 6.28x and 1.15x faster than that of the HPC core only and the MZ only on average, respectively. The area of MZ is 2.052 square millimeters. © 2022 IEEE.

关键词： Systolic arrays

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GelPixel: A Single-Pixel-Based Tactile sensor

GelPixel: A Single-Pixel-Based Tactile Sensor

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2023 IEEE International conference on Real-Time Computing and Robotics, RCAR 2023

作者： Huang, Binhua Li, xiaoyu Sumari, Putra Ye, Chaoxiang Zhou, Zhenning Yin, Meng Yi, Zhengkun Wu, xinyu Shenzhen Institute of Artificial Intelligence and Robotics for Society Siat Branch Shenzhen518055 China Universiti Sains Malaysia School of Computer Science 11800 Malaysia Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen518055 China

ISBN: (纸本)9798350327182

In this paper, we present the design and development of a novel optical tactile sensor that uses a single-pixel color light-to-frequency converter (TCS3200) and spectral decoding to recognize presses at different positions. This innovative approach overcomes the limitations associated with camera-based sensors, such as increased manufacturing costs and shape restrictions, enabling potential integration as a skin-like layer over a robot's body. Our proposed direct light propagation structure demonstrates enhanced sensitivity and a broader measuring range compared to traditional reflection structures. Using Ecoflex as the elastomer, the sensor's design incorporates a three-layer structure, including an LED layer, an elastomer layer, and a color sensor layer. Experimental results demonstrate that the proposed sensor performs well in localization tasks, achieving over 95% accuracy using multi-target regression for rendering poked positions. This study demonstrates the potential of single-pixel-based tactile sensors in various applications and provides a foundation for further exploration in this area. © 2023 IEEE.

关键词： Tactile sensors

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Arduino-Powered Sonar Radar MOKSH: Design, Implementation, and applications

Arduino-Powered Sonar Radar MOKSH: Design, Implementation, a...

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advanced Computing and Emerging Technologies (ACET), International conference on

作者： Seejal Seejal Harish Kumar Anuradha Taluja Ekta Gandotra P. K. Gupta Computer Science and Engineering Jaypee University of Information Technology Himachal Computer Science and Engineering SDGI University Ghaziabad India Computer Science and Engineering AKTU Lucknow Ghaziabad India Computer Science and Engineering Jaypee University of Information Technology Computer Science and Engineering Mohan Babu University Tirupati

ISBN: (数字)9798350367720

ISBN: (纸本)9798350367737

The Arduino-controlled radar systems constituting the fundamental elements of this RADAR system, an ultrasonic sensor and servo motor are employed. The fundamental operation of the system is to detect objects within the range specified. Attached to the servo motor is an ultrasonic sensor that rotates approximately 180 degrees and provides a graphical representation on the processing IDE software. In addition to providing a graphical representation, the Processing IDE also provides the object's angle, position, and distance. The administration of this system is facilitated by Arduino. The Arduino UNO board is adequate for both interface development and ultrasonic sensor and display device control. We learned about extant navigation and obstacle detection innovations as well as various systems that make efficient use of ultrasonic sensors through our research. This RADAR system is primarily utilized in the fields of object identification, mapping, surveillance, and monitoring, in addition to navigation and positioning. Additionally, these low-cost systems are appropriate for implementation indoors.

关键词： Technological innovation Surveillance Sonar applications Sonar navigation Acoustics Software Radar applications Object recognition Servomotors

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Electro-Mechanical Impedance Measurements in Space Environment with Miniaturized Hardware 18

Electro-Mechanical Impedance Measurements in Space Environme...

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conference on Health Monitoring of Structural and Biological systems xVIII

作者： Nwokocha, Funmilola Hunter, David Rue, Matthew Zagrai, Andrei New Mexico Inst Min & Technol Mech Engn Socorro NM 87801 USA

ISBN: (数字)9781510672093

ISBN: (纸本)9781510672093;9781510672086

Ever growing number of space systems raises a question about their safety and longevity. Over time, the complex space environment influences structural materials and electronics affecting mission objectives and performance. In order to determine the effect of space environment on spacecraft's structural condition, material properties and structural interfaces need to be assessed in space. Hence, it is suggested that active non-destructive measurements are employed to provide structural health information to the spacecraft's operator. Electro-mechanical impedance method is a promising approach to SHM of space structures due to its use of small unobtrusive piezoelectric sensors and lightweight hardware. In laboratory settings, this method typically utilizes bulky and heavy instruments, but for mid-frequency bands, a small and lightweight impedance measurement circuit could be built. A miniaturized impedance measurement analyzer was designed and built for applications requiring very small hardware mass. The development was driven by the intention to utilize the miniaturized analyzer for SHM of space structures in orbit. The impedance analyzer was designed and built from off-the-shelf components to enable impedance measurements in lower kHz frequency band. It was used to measure the impedance of a payload structure resembling a fixed plate. The aim of this measurement was to demonstrate data acquisition and storage by the miniaturized impedance logger and to compare its performance to laboratory scale instruments. The paper further discusses the effect of space environment on structures, describes and validates an analytical model for a fixed-fixed rectangular plate and provides analysis of the potential influence of thermal variation and radiation in space on electro-mechanical impedance signature.

关键词： electro-mechanical impedance space environment piezoelectric sensor radiation fixed plate

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Software and Hardware Cooperative Implementation of the Rafflesia Optimization Algorithm 5th

Software and Hardware Cooperative Implementation of the R...

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5th International conference on Smart Vehicular Technology, Transportation, Communication and applications, VTCA 2022

作者： Fu, Zonglin Pan, Jeng-Shyang Guo, Yundong Snášel, Václav College of Computer Science and Engineering Shandong University of Science and Technology Qingdao266590 China Faculty of Electrical Engineering and Computer Science VŠB-Technical University of Ostrava Ostrava70032 Czech Republic

ISBN: (纸本)9789819908479

With the development of edge technology in the fields of transportation, wireless sensor networks, and the internet of things, more and more intelligent optimization algorithms are implemented in hardware structures. The Rafflesia optimization algorithm (ROA) is a novel intelligent optimization algorithm proposed recently. To observe its performance on hardware, this paper implements the ROA algorithm in a cooperative way of software and hardware, referred to as the FROA algorithm. To convenient testing and accelerated computing, the initialization module, fitness module, and update module of the FROA algorithm are deployed on the advanced RISC machine (ARM) platform and the field programmable gate array (FPGA) platform, respectively. In the experimental part, we test the FROA algorithm on nine different benchmark functions. The results are compared with those implemented in software. The experimental results demonstrate the effectiveness and superiority of the FROA algorithm. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Wireless sensor networks

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Calibration of a Robot's Tool Center Point Using a Laser Displacement sensor

Calibration of a Robot's Tool Center Point Using a Laser Dis...

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2022 International conference on advanced Robotics and Intelligent systems, ARIS 2022

作者： Lin, Chih-Jer Wang, Hsing-Cheng Graduated Institute of Automation Technology National Taipei University of Technology Taiwan

ISBN: (数字)9781665487184

ISBN: (纸本)9781665487184

The conventional tool center point calibration (TCP) method requires the operator to set the actual position of the tool center point by eye. To address this lengthy workflow and low accuracy while improving accuracy and efficiency for time-saving and non-contact calibration, this paper proposes an enhanced automatic TCP calibration method based on a laser displacement sensor and implemented on a cooperative robot with six degrees of freedom. During the calibration process, the robot arm will move a given distance along the x and Y axes and collect the information when the tool passes through the laser during the process to calculate the deflection of the tool, and then continue to move a given distance along the x and Y axes for the second height calibration. After the deflection angle is calculated and calibrated by triangulation, the deflection calibration is completed and the third x and Y axis displacement is performed to find out the exact position of the tool on the x and Y axes. Finally, the tool is moved to a position higher than the laser, and the laser is triggered by moving downward to obtain information to complete the whole experimental process and get the calibrated tool center position. The whole calibration method is firstly verified in the virtual simulation environment and then implemented on the actual cooperative robot. The results of the proposed TCP calibration method can achieve a positioning accuracy of about 0.07 mm, a positioning accuracy of about 0.18 degrees, a positioning repeatability of ± 0.083 mm, and a positioning repeatability of less than ± pm 0.17 degrees. This result meets the requirements of TCP calibration, but also achieves the purpose of simple, economical and time-saving, and it takes only 60 seconds to complete the whole calibration process. © 2022 IEEE.

关键词： Calibration

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RF Sensing -enabled Interference Mitigation for Wi-Fi-based IoT systems: A Deep Learning Approach

RF Sensing -enabled Interference Mitigation for Wi-Fi-based ...

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IEEE conference on Communications and Network Security (CNS)

作者： Lin, ChunChih Li, Gen Zhang, xiaonan Guo, Linke Clemson Univ Holcombe Dept Elect & Comp Engn Clemson SC 29634 USA Florida State Univ Dept Comp Sci Tallahassee FL 32306 USA

ISBN: (纸本)9798350375978;9798350375961

The proliferation of the Internet of Things (IoT) over the 2.4GHz has transformed the way people interact with the world in their daily lives. For emerging applications requiring diverse types of data, using IoT devices from different protocols, such as Wi-Fi, Bluetooth, and ZigBee, for data collection will help fulfill designated objectives. Hence, the increasing use of these IoT devices will form a heterogeneous environment with inevitable wireless coexistence. Due to the dynamic IoT environment, the wireless transmission among heterogeneous IoT devices becomes unknown and notoriously hard to manage, where the network performance is always compromised. This paper leverages the RF sensing information to develop a deep learning-based framework for mitigating the cross-technology interference of the Wi-Fi-based IoT system. Each IoT device can provide detailed Channel State Information (CSI) of the transmission link, by which the gateway uses Generative Adversarial Networks (GAN) for building a detailed environmental RF map. Then, we propose a CSI -inspired gateway topology management strategy to find the optimal gateway location, anticipating reaching the highest network throughput. To enhance the efficiency of the proposed scheme, we also adopt the advanced differentiable augmentation approach to reduce the training data size for gateway deployment. Extensive experimental results have demonstrated both the feasibility and efficiency of our design.

关键词： Wireless local area networks (WLAN)

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Loosely-vs. Tightly-coupled incorporation of nonlinear measurements in tracking applications 62

Loosely-vs. Tightly-coupled incorporation of nonlinear measu...

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62nd Israel Annual conference on Aerospace Sciences, IACAS 2023

作者： Hackmon, Shlomi Sigalov, Daniel Rafael-Advanced Defense Systems Israel

We consider the problem of tracking a single target using a set of sensors with nonlinear measurement models. Two options for utilizing the measurements are addressed. First, is the direct utilization of raw sensor data using a nonlinear fil-Ter such as the Extended Kalman filter (EKF). The second option is based on the conversion of the set of nonlinear observations to a single cartesian measurement and subsequent application of a linear Kalman filter or related algorithm. Nat-urally, both approaches involve approximations. In the former case, there is the inherent approximation of the EKF mechanism. The nonlinearities in the measure-ment model are tackled by the means of linearization about the latest estimate. On the contrary, in the second approach a nonlinear optimization problem needs to be solved and, typically, it can be solved only approximately. Moveover, usually, the measurement noise covariance can not be analytically transformed through a nonlinear function. Thus, in practical cases, it is not a-priori clear which of the two approaches is preferable. We borrow the terminology from the navigation domain, and refer to direct processing of the raw sensor measurements by a nonlinear algo-rithm (mostly EKF) as the tighly coupled (TC) architecture. On the contrary, the setup in which a linear filter is preceded by a nonlinear transformation of the raw data into an effective Cartesian measurement, will be called loosely coupled (LC). In this work we compare, through a numerical study, the TC and LC approaches in a few multisensor scenarios involving nonlinear measurement models, and identify whether one of the approaches should be preferred over its counterpart. © IACAS 2023. All rights reserved.

关键词： Extended Kalman filters

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