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A Survey on Resource Management in Joint Communication and Computing-Embedded SAGIN

IEEE Communications Surveys and Tutorials 2024年第3期27卷 1-1页

作者： Chen, Qian Guo, Zheng Meng, Weixiao Han, Shuai Li, Cheng Quek, Tony Q. S. School of Electronics and Information Engineering Harbin Institute of Technology Harbin China School of Engineering Science Simon Fraser University Burnaby BC Canada Singapore University of Technology and Design Singapore

The advent of the 6G era aims for ubiquitous connectivity, with the integration of non-terrestrial networks (NTN) offering extensive coverage and enhanced capacity. As manufacturing advances and user demands evolve, space-air-ground integrated networks (SAGIN) with computational capabilities emerge as a viable solution for services requiring low latency and high computational power. Resource management within joint communication and computing-embedded SAGIN (JCC-SAGIN) presents greater complexity than traditional terrestrial networks. This complexity arises from the spatiotemporal dynamics of network topology and service demand, the interdependency of large-scale resource variables, and intricate tradeoffs among various performance metrics. Thus, a thorough examination of resource management strategies in JCC-SAGIN is crucial, emphasizing the role of non-terrestrial platforms with processing capabilities in 6G. This paper begins by reviewing the architecture, enabling technologies, and applications in JCC-SAGIN. Then, we offer a detailed overview of resource management modeling and optimization methods, encompassing both traditional optimization approaches and learning-based intelligent decision-making frameworks. Finally, we outline the prospective research directions in JCC-SAGIN. IEEE

关键词： Decision making

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Recommendation of Restaurant Menu Considering Meal History of Family

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2025年第4期145卷 452-458页

作者： Maeda, Yasunari School of Regional Innovation and Social Design Engineering Kitami Institute of Technology 165 Koen-cho Hokkaido Kitami090-8507 Japan

Many healthcare-oriented menu recommendation methods are proposed in previous research. In some previous research, the purchase cost is minimized in addition to the minimization of the healthcare loss under the limit on the purchase cost when there are multiple optimal solutions. But in the previous research, the minimization of the healthcare loss considering meal history has not been studied. In this research, a recommendation method for restaurant menus that minimizes the healthcare loss under the limit on the purchase cost, considering meal history of family is proposed. The proposed method also calculates the minimum purchase cost when there are multiple optimal solutions on the healthcare loss. In the proposed method, the healthcare loss and the purchase cost are minimized by dynamic programming. The effectiveness of the proposed method is shown by some computational examples. In the computational examples, the healthcare loss of the proposed method is confirmed to be smaller than the loss of the empirical recommendation method. Adaptive menu selection examples under cost constraints, considering meal history of family are also confirmed. This research is basic research, and future extended research is required. © 2025 The institute of Electrical Engineers of Japan.

关键词： Dynamic programming

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Microstructure and Mechanical Properties of Friction Stir Welded Al–Mg–Si Alloys Under Variable Parameter Conditions

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Journal of The Institution of Engineers (India): Series D 2024年第2期105卷 1081-1092页

作者： Srivastava, Manu Khan, Nasir Nabi, Shazman Rathee, Sandeep Department of Mechanical Engineering PDPM Indian Institute of Information Technology Design and Manufacturing Jabalpur India Department of Mechanical Engineering Amity University Madhya Pradesh Gwalior India Department of Mechanical Engineering National Institute of Technology Srinagar Jammu and Kashmir India

The current study investigates the variation of mechanical properties and microstructural evolution with varying process parameters for Al–Mg–Si (AA6061-T6) alloys during friction stir welding (FSW) process. The experiments were designed using Taguchi’s technique, with three tool factors being examined—rotational speed (RST), traverse speed (TST), and shoulder diameter (SDT)—at three different levels each. L27 Orthogonal array has been utilized to analyze the effect of these parameters upon mechanical strength. Experimental results were analyzed both quantitatively and qualitatively, with statistical techniques being used for quantitative analysis, and microstructural evolution being used for qualitative analysis. The study found that traverse speed of tool had the most significant effect on ultimate tensile strength, with a contribution of 25.94%, followed by shoulder diameter of tool (25.86%) and rotational speed of tool (20.30%). Furthermore, the study found that the interactions between selected parameters had a significant impact on mechanical strength. Interaction between TST and SDT contributed 14.10%, that between RST*TST contributed 6.51% and the least contribution is between RST and SDT which is around 3.10%. Results of mechanical strength were found to agree with observations related to microstructural analysis for the FSW joints. © The Institution of Engineers (India) 2023.

关键词： Friction stir welding

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Entry Guidance with Terminal Time Constraint Based on Reduced-Order Dynamics

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IEEE Transactions on Aerospace and Electronic Systems 2024年第3期61卷 5949-5961页

作者： Liu, Xu Li, Xiang Zhang, Houjun Zhu, Lu Huang, Hao Beijing Institute of Technology School of Aerospace Engineering Beijing100081 China Beijing System Design Institute of Electro-Mechanic Engineering Beijing100854 China Aerospace System Engineering Shanghai Shanghai201108 China

An entry guidance method that considers the terminal time constraint has been developed for hypersonic glide vehicles. A key insight underpinning this method is that the flight time becomes fixed once the vehicle's longitudinal motion is established. Based on this, an altitude versus velocity profile that satisfies the time-To-go requirement is first generated in the longitudinal guidance. Then, the lateral guidance algorithm formulates a bank reversal logic based on the flight trajectory obtained by integrating reduced-order dynamics. With this logic, the vehicle can reach the desired terminal interface while implementing terminal time control by tracking the longitudinal profile. Simulations results reveal the effectiveness of the proposed scheme in managing the terminal time constraint while satisfying conventional entry requirements. © 1965-2011 IEEE.

关键词： Hypersonic vehicles

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design and assessment of low frequency synchronous demodulator in Dicke radiometer for passive tissue thermometry

Design and assessment of low frequency synchronous demodulat...

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2024 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2024

作者： Arjun, A.K. Arunachalam, Kavitha Department of Engineering Design Indian Institute of Technology - Madras Chennai India

ISBN: (纸本)9798350379693

In this paper we present the design and assessment of a low frequency synchronous demodulator circuit in a single reference Dicke microwave radiometer meant for tissue thermometry. In medical applications, microwave radiometry is used as a non-invasive method to estimate the core-body-temperature (CBT) of a subject by integrating the total noise power emitted by the sub-cutaneous heat source. However, since the method is sensitive to ambient conditions and external noise, a bias cancellation system configuration known as Dicke radiometer is needed. This system configuration requires a synchronous demodulator which allows us to subtract the system bias signal from the noise signal of interest. Towards this goal, we have designed, simulated, fabricated, and tested a low frequency synchronous demodulator circuit. This circuit uses an analog SPDT switch to separate the source and reference signals from the modulated signal, integrates them and then uses a switched capacitor circuit to obtain the differential signal. Preliminary results show the ability to resolve signals with differences in amplitude of few millivolts over the narrow clinical temperature range of 35 to 42 ℃. © 2024 IEEE.

关键词： Noninvasive medical procedures

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BEHAVIOR OF BUILT-UP BEAM USING HOT-ROLLED CHANNEL STEEL SUBJECTED TO CYCLIC LOADINGS

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2023年第806期88卷 666-674页

作者： Zhang, Zilu Kanao, Iori Li, Jun Graduate School of Science and Technology Kyoto Institute of Technology Japan Faculty of Design and Architecture Kyoto Institute of Technology Japan School of Civil Engineering Qingdao University of Technology China

Finite element analysis is conducted on the built-up beam using hot-rolled channel steel subjected to vertical load and cyclic antisymmetric moment. The following were obtained. 1. The separation between channel steels will affect the strength and deformation of the built-up beam. 2. Suitable bolt arrangements can prevent capacity deterioration, HS01.5H and S3H are recommended. 3. The equal arrangement of lateral bracing is proposed. For maximum amplitude is 6θp, the spacing is 10 times beam-width for λy250, and additional bracings are required for λy＞250. © 2023 Architectural institute of Japan. All rights reserved.

关键词： Hot rolling

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Comparative Analysis of Machine Learning Algorithms in Fish Survival Prediction

Comparative Analysis of Machine Learning Algorithms in Fish ...

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2024 IEEE Bangalore Humanitarian technology Conference, B-HTC 2024

作者： Shirwaikar, Rudresh D. D'Souza, Lyzandra Bhangle, Anirudh Santosh Joshi, Sarang Deepak Jathar, Nupur Ajit Alvares, Jonathan Elroy Agnel Institute of Technology and Design Department of Computer Engineering Mapusa India

ISBN: (纸本)9798350344509

This research paper conducts an exploration of prevalent machine learning classification algorithms, emphasizing the refinement of Random Forest models to optimize performance. The initial phase involves a comparative analysis of Random Forest, k-Nearest Neighbors (kNN), Support Vector Machine (SVM), Logistic Regression, and Naive Bayes Classification algorithms across the dataset, resulting in Random forest to be best performed among all with average accuracy of 61%. Subsequently, then we focus on enhancement of the Random Forest algorithm with random train-test split dataset, resulting in an enhanced average accuracy of 65% which is about 4% improvement to the previous accuracy and choosing the best traintest split dataset, along with fine tuning the model, improved the average accuracy to 73% which is about 12% improvement to previous accuracy which is significantly higher showcasing the significance of precise algorithmic tuning. The completion of our investigation lies in the creation of an integrated model which incorporates multiple Random Forest classifier models, each specifically trained for binary class classification, along with a comprehensive model designed for multiclass classification. This combined model excels with a peak accuracy of 82.75% for the best split, demonstrating its strong performance in classification tasks. This research not only contributes to the theoretical understanding of algorithm performance and optimization but also offers practical insights for the application of machine learning in challenging classification scenarios. © 2024 IEEE.

关键词： Classification (of information)

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Force Control and Slip Detection for A Non-Backdrivable Robotic Gripper 6

Force Control and Slip Detection for A Non-Backdrivable Robo...

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6th IEEE International Conference on Artificial Intelligence in engineering and technology, IICAIET 2024

作者： Joshy, Joseph Sebastian, Bijo Thondiyath, Asokan Indian Institute of Technology Madras Department of Engineering Design Chennai India

ISBN: (纸本)9798350389692

Intelligent manipulation systems are now being used to automate various operations, including material handling, advanced manufacturing, food processing, chemical, and medical analysis. Stable grasping is one of the crucial capabilities needed for effective use of intelligent manipulation systems in above applications. High-fidelity force control is needed when grasping objects of different shapes, weights, and stiffness. Existing robotic grippers with large payload capacity are typically nonbackdrivable. Although these systems can limit the maximum grasp force applied to an object through current control, highfidelity force control is not possible at the individual finger level. To this extent, we propose a novel force control framework that takes feedback from Force Sensitive Resistors (FSRs) mounted with deformable pads on each finger of the robotic gripper. The proposed system allows for precise force control, as well as slip detection and counter action, resulting in a stable grasp, even when the object weight is unknown. While this work demonstrates implementation of the proposed techniques on a three-finger Robotiq gripper, they could be applied on any generic robotic gripper with backdrivable or non-backdrivable actuation system. © 2024 IEEE.

关键词： Grippers

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Multi-turn Loop Antenna for Monitoring Internal Brain Temperature

Multi-turn Loop Antenna for Monitoring Internal Brain Temper...

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2024 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2024

作者： Arjun, A.K. Arunachalam, Kavitha Department of Engineering Design Indian Institute of Technology - Madras Chennai India

ISBN: (纸本)9798350379693

design of a multi-turn loop antenna for monitoring the internal brain temperature of a subject using microwave radiometry is presented. The antenna model consists of a 4 turn circular loop of 40 mm diameter in a PTFE dielectric substrate with 80 mm diameter ground plane to reduce electromagnetic interference. The antenna was designed using Ansys HFSS software and has a return loss greater than 10 dB at the center frequency of 2.9 GHz with 10 dB return loss bandwidth of 84 MHz. Further, the volume loss density in human head was computed for different placements of the antenna radially outward from the human head to account for human head hair thickness and an optimal placement was identified. The optimal air gap for brain temperature monitoring was determined as 10 mm. The VLD calculated at 2.9 GHz within the human head model for 10 mm air gap was found to be sufficient for estimating the temperature of human cortex located at a depth of 20 mm. © 2024 IEEE.

关键词： Loop antennas

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Preliminary Numerical Investigation of the Use of Chip Inductor for Eddy Current Testing 1

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Conference and Exhibition on Non Destructive Evaluation, NDE 2022

作者： Santhakumar, Ezhil Arunachalam, Kavitha Department of Engineering Design Indian Institute of Technology Madras Chennai India

ISBN: (数字)9789819726042

ISBN: (纸本)9789819726035

Numerical investigation of the feasibility of using a chip inductor as an eddy current (EC) probe is presented in this work. The electrical behavior of the chip inductor is modeled using finite element method (FEM)-based numerical simulation. Commercially available chip inductors were modeled in MAXWELL, Ansys simulation software and the permeability (μr) of the ferrite core and number of turns in the coil (N) were estimated using parametric sweeps. Numerical simulations were performed for shielded and unshielded chip inductors. EC testing (ECT) of a 10 mm thick Aluminum plate was investigated over 100–1000 kHz based on the material properties of the specimen and the electrical impedance of the chip inductor. Change in the electrical impedance of the shielded chip inductor was analyzed for a 2 mm wide axial defect in the 10 mm plate specimen with varying defect depths. Simulation results indicated reduction in mutual coupling for shielded chip inductor compared to the unshielded model. Numerical simulations suggest the feasibility of broadband excitation for the chip inductor due to the minimum parasitic effects. Based on the simulation study, it is concluded that shielded chip inductor could be used for designing low profile EC probes for non-destructive testing of thin metallic specimens. © Indian Society for Non-destructive Testing 2024.

关键词： Eddy current testing

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