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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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The Relationships Between the Binary Correlation and Accuracy in Logistic Regression for Predicting Employee Attrition

The Relationships Between the Binary Correlation and Accurac...

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International Conference on Computing, engineering, and Design (ICCED)

作者： Imelda Juliana BR. Sibarani Fergyanto E. Gunawan Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia

ISBN: (数字)9798331529376

ISBN: (纸本)9798331529383

This research paper examines the accuracy of the logistic regression method in predicting employee attrition. Employee attrition is of particular interest to human resources departments due to its impact on organizational performance and employee satisfaction. Specifically, this study aims to establish the relationships between various control variables and the binary response variable representing employee attrition. Using the popular IBM HR Analytics Employee Dataset, we assess the contribution of each control variable to prediction accuracy. Additionally, we determine the correlation between each control variable and employee attrition data. For binary control variables, we use the phi correlation, while for non-binary control variables, we employ the point-biserial correlation coefficient. Our results reveal a positive correlation between the value of the correlation coefficient and the improvement in prediction accuracy, highlighting an important principle in building logistic regression models for similar cases.

关键词： Correlation coefficient Measurement Logistic regression Correlation Accuracy Machine learning algorithms Predictive models Reliability engineering Sustainable development Random forests

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ANALYSIS OF CAPILLARY ABSORPTION PHENOMENA OF CEMENT PASTE AND MORTAR BY USING TWO LIQUIDS IMMERSION METHOD

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2022年第792期87卷 171-181页

作者： Kawasaki, Taihei Yifter, Simon Seifu Fujimoto, Satoshi Graduate Program in Architecture and Building Engineering Utsunomiya University Japan Dept. of Engineering Utsunomiya University Japan Ethiopian Institute of Technology in Mekelle Mekelle University Ethiopia Dept. of Architecture and Urban Design Utsunomiya University Japan

Durability of reinforced concrete is correlated to the water content. Since the main cause of water content increase is rainwater supply from the surface, it is important to understand the mechanism of absorption. This paper analyzes the initial absorption of cement mortar caused by the capillary phenomena. Absorption test for two liquids were conducted for various mix proportions under several relative humidity and surface treatments. By using Lucas-Washburn equation, parameters corresponding to pore structure and wettability of pore internal wall were evaluated. It was found that almost any mix proportions of cement mortar have approximately the same internal pore wettability. © 2022 Architectural Institute of Japan. All rights reserved.

关键词： Wetting

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Embodied Co-Reflection: Enhancing Fitness Data Reflection through the Integration of Embodied Interaction and Narrative Feedback

Embodied Co-Reflection: Enhancing Fitness Data Reflection th...

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2025 CHI Conference on Human Factors in Computing Systems, CHI EA 2025

作者： Imai, Atsuhiro Misaki, Daigo Graduate School of Engineering Mechanical Engineering Program Human Interface Lab. Kogakuin University Shinjuku-Ku Tokyo Japan Faculty of Engineering Department of Mechanical Systems Engineering Human Interface Lab. Kogakuin University Shinjuku-Ku Tokyo Japan

ISBN: (纸本)9798400713958

Many fitness trackers monitor physical activity by presenting data such as heart rate and step count in numerical or graphical formats. However, these methods often fail to connect the data with users’ subjective bodily sensations, making it challenging for users to perceive the information as personally relevant. To address this issue, this study proposes a reflective system that integrates embodied interaction with voice narrative feedback. The system utilizes the body as a reference frame for fitness data and presents health information in a story-like format. Results from user studies indicate that the proposed system significantly improves engagement (aesthetic appeal, reward factors) and reduces cognitive load (satisfaction, frustration), showing moderate to large effect sizes. It also strengthens the connection between users and their data. This approach demonstrates the potential to overcome the limitations of traditional fitness trackers, offering a novel and immersive reflective experience in the healthcare and fitness domains. © 2025 Copyright held by the owner/author(s).

关键词： Embodied Interaction Fitness Data Reflection Human-Computer Interaction Large Language Models User Engagement Voice Feedback

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Relationship between Embedment and Compressive Properties with Grain Direction of Hardwood Species

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Zairyo/Journal of the Society of Materials Science, Japan 2024年第8期73卷 669-674页

作者： Takuro, Mori Tagawa, Riho Inoue, Ryo Tanaka, Kei Hiroshima University Graduate School of Advanced Science and Engineering Kagamiyama Higashi-Hiroshima739-8527 Japan Kumamoto University Faculty of Advanced Science and Tchnology Kurokami Chuo-ku Kumamoto860-8555 Japan Oita University Faculty of Science and Technology Architecture Program Dannoharu Oita870-1124 Japan

In general, softwoods are used as the main structural material for wooden structures, while hardwoods are less used. Some hardwoods show superior mechanical performance due to the high density about 1.0 x 103 kg/m3. Therefore, the utilizing hardwoods as structural materials are supposed to more flexible structural design proposals. Studies on the mechanical performance of hardwoods for structural design are not enough, especially as an embedment performance. In this study, it was conducted embedment and compression tests related to the joint performance of wooden structures using three species of hardwoods (Ulin, Buna, and Kuri) and a softwood (Sugi) to investigate the effects of strength performances such as density and woody structure. As a result, hardwoods with higher density showed higher strength performance. Embedment strength relative to compressive strength was 0.94 to 1.49 times higher in the direction parallel to the grain and 3.46 to 5.08 times higher in the direction perpendicular to the grain. About embedment strength, the ring-porous wood, Kuri, showed a similar trend (TR⨫RT, TL⨫RL) to that of a softwood, Sugi, while the diffuse-porous wood, Ulin and Buna, showed different trends (RTRL). © 2024 Society of Materials Science Japan. All rights reserved.

关键词： Hardwoods

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Multiobjective Robust PI Synthesis in Plants with Uncertain Poles

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IFAC-PapersOnLine 2024年第7期58卷 174-179页

作者： Ricardo Massao Kagami Roberto Zanetti Freire Gilberto Reynoso-Meza Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifícia Universidade Católica do Paraná (PUCPR) Brazil Industrial and Systems Engineering Graduate Program (PPGEPS) Universidade Tecnológica Federal do Paraná (UTFPR) Brazil Control Systems Optimization Laboratory (LOSC) PUCPR Brazil

The use of multiobjective optimization procedures for control tuning has been constantly explored, presenting satisfactory results, and generating significant contributions to control engineering. In this way, the field of robust control can benefit significantly from the integration of multiobjective optimization design procedures for robust Proportional-Integral-Derivative (RPID) controller synthesis, enabling innovative solutions to complex control challenges. Due to this fact, this paper explores an approach to utilize multiobjective optimization algorithms in a simplified procedure, considering uncertain systems in the form of interval plants with uncertain poles, the Kharitonov theorem is used to obtain a region of stability as search space for the multiobjective algorithm, being the optimization process performed over a nominal system model. Two numerical cases and a flexible actuator model were used to demonstrate the procedure for RPI synthesis, resulting in robustly stable controllers with optimized performance over error and control signal effort measures.

关键词： Robust control multiobjective optimization robust stability Kharitonov theorem PI controller

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Aerodynamic Effects Compensation on Multi-Rotor UAVs Based on a Neural Network Control Allocation Approach

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IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 295-312页

作者： Sarah P.Madruga Augusto H.B.M.Tavares Saulo O.D.Luiz Tiago P.do Nascimento Antonio Marcus N.Lima Graduate Program of Electrical Engineering Universidade Federal de Campina GrandeCampina Grande-PBBrazil Department of Electrical Engineering Universidade Federal de Campina GrandeCampina Grande-PBBrazil IEEE Department of Computer Systems Universidade Federal da ParaibaJoao Pessoa-PBBrazil

This paper shows that the aerodynamic effects can be compensated in a quadrotor system by means of a control allocation approach using neural ***,the system performance can be improved by replacing the classic allocation matrix,without using the aerodynamic inflow equations *** network training is performed offline,which requires low computational *** target system is a Parrot MAMBO drone whose flight control is composed of PD-PID controllers followed by the proposed neural network control allocation *** a quadrotor is particularly susceptible to the aerodynamics effects of interest to this work,because of its small *** compared the mechanical torques commanded by the flight controller,i.e.,the control input,to those actually generated by the actuators and established at the *** was observed that the proposed neural network was able to closely match them,while the classic allocation matrix could not achieve *** allocation error was also determined in both ***,the closed-loop performance also improved with the use of the proposed neural network control allocation,as well as the quality of the thrust and torque signals,in which we perceived a much less noisy behavior.

关键词： Aerodynamics effects control allocation minidrone multi-rotor UAV neural networks

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Integrating a Small-Scale Adaptive Solar Drying Systems with Nichrome Wire for Processing Dried Moro-Moro Fish

Integrating a Small-Scale Adaptive Solar Drying Systems with...

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2024 IEEE Sustainable Power and Energy Conference, iSPEC 2024

作者： Gulben, Karell Keith P. Salat, Datu Al-Ashari J. Boddie, Basilio Corleone U. Cayme, Liregine Sobretodo Boloron, Nino Louie Reyes Tayactac, Reylina Garcia Mapúa Malayan Colleges Mindanao Mechanical Engineering Program Davao Philippines Mapúa Malayan Colleges Mindanao School of Mechanical Manufacturing and Energy Engineering Mapúa University School of Graduate Studies Intramuros Manila Davao City Philippines Mapúa Malayan Colleges Mindanao Central Mindanao University Bukidnon Philippines School of Mechanical Manufacturing and Energy Engineering Mapúa University School of Graduate Studies Intramuros Manila Philippines

ISBN: (纸本)9798350395075

This study evaluates a small-scale adaptive solar drying system using nichrome wire to enhance the drying process for Moro-moro fish. The nichrome wire's rapid heating accelerates drying, reduces exposure to pests, and mitigates issues like climate variations and uneven drying. Although mechanical dryers exist, their high costs and limited efficiency restrict use. This adaptable system provides a sustainable and effective method of preserving fish by optimizing drying through steady heat and moisture control. © 2024 IEEE.

关键词： Moisture control

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The Influence of Overcharging and Over-Discharging on the Capacity Degradation of Lithium-Ion Batteries

The Influence of Overcharging and Over-Discharging on the Ca...

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Joelton Deonei Gotz Marco Antonio Simões Teixeira Fernanda Cristina Corrêa Emilson Ribeiro Viana Alceu André Badin Milton Borsato Graduate Program in Electrical and Computer Engineering Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil Graduate Program in Informatics (PPGIa) Pontifical Catholic University of Paraná (PUC-PR) Curitiba Brazil Graduate Program in Electrical Engineering Federal Technological University of Paraná (UTFPR-PG) Ponta Grossa Brazil Physics Department Graduate Program in Physics and Astronomy Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil Graduate Program in Mechanical Engineering Federal Technological University of Paraná (UTFPR-CT) Curitiba Brazil

ISBN: (数字)9798331541606

ISBN: (纸本)9798331541613

Lithium-ion batteries (LIB) are the best technology for supplying and storing energy for electric mobility systems. Despite that, this technology is sensitive to abuses that can compromise its lifetime and cause fire and explosion risks. In this context, if LIB is not correctly controlled, some abuses, such as overcharging (OC) and over-discharging (OD), can be observed and provoke a loss of capacity. Therefore, this work presented the application of several experiments in cells, of the NMC type, under OC and the combination of OC and OD. The results indicated that cells charged until 4.4 and 4.5 V and discharged until 3.0 V do not lose capacity for twenty-five cycles, but more cycles should be done to understand the impact over time. On the other side, the cell charged until 4.6 and 4.8 V had its security protection romped in the fourth charging cycle, and the cell charged until 5.0 V had its safety compromised in the first charging cycle. Conversely, cells with a combination of OC and OD were more compromised. In this context, while a cell is submitted only with OC and does not lose capacity, a cell under OC and then under OD had its protection romped in the third charging cycle. Cells under 4.6 V and 4.8 V lost capacity during the second charging cycle. In conclusion, OC provokes a high level of degradation in the cell, but the combination of OC and OD causes even more degradation.

关键词： Degradation Lithium-ion batteries Battery management systems Propulsion Security Reliability Protection Stress Monitoring Predictive maintenance

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Implementation Graph Database Framework for Credit Card Fraud Detection 8

Implementation Graph Database Framework for Credit Card Frau...

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8th International Conference on Computer Science and Computational Intelligence, ICCSCI 2023

作者： Mauliddiah, Nurrahmi Suharjito Computer Science Department BINUS Online Learning Bina Nusantara University Jakarta11480 Indonesia Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta11480 Indonesia

Credit card use is becoming more and more commonplace every day. Financial organizations and credit card customers lose a lot of money because of complicated illegal transactions. Fraudsters constantly stay on top of new technology to quickly perpetrate fraud against customer transaction patterns. We analyze credit card transaction networks and identify suspicious patterns, such as transactions connected to multiple accounts or unusual transaction patterns, transactions made at unusual times, and to monitor credit card transactions in real-time and quickly identify suspicious transactions. TigerGraph is used to analyze data, display results on a dashboard, and send notifications via email. One meth'\ Vc 1``13-od commonly used in anomaly detection is to compare data values against the standard deviation. In this research, we explain the use of TigerGraph as a platform for anomaly detection above the standard deviation, as well as the use of the Louvain algorithm in finding merchant communities used by fraudsters. The data used in this study comes from Sparkov simulation data obtained from Kaggle. Our results show that by using TigerGraph, we managed to achieve a very high accuracy rate of 99.77%, precision 82.84%, recall 72.38%, and f1-score 77,26% in predicting transaction fraud on Sparkov simulation data. This is much better than the results reported in a paper that uses the supervised machine learning method with the AdaBoost algorithm which achieves the highest accuracy of 77%. © 2023 The Authors. Published by Elsevier B.V.

关键词： Alert Credit card fraud detection Dashboard TigerGraph

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