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Articles 4591 - 4620 of 36804

Full-Text Articles in Engineering

การศึกษาเชิงเปรียบเทียบการตัดสินใจผลิตเองหรือจ้างผลิต: กรณีศึกษา ระบบพลังงานแสงอาทิตย์ในโรงงานชิ้นส่วนยานยนต์, เสาวลักษณ์ สระธรรม Jan 2023

การศึกษาเชิงเปรียบเทียบการตัดสินใจผลิตเองหรือจ้างผลิต: กรณีศึกษา ระบบพลังงานแสงอาทิตย์ในโรงงานชิ้นส่วนยานยนต์, เสาวลักษณ์ สระธรรม

Chulalongkorn University Theses and Dissertations (Chula ETD)

การวิจัยครั้งนี้มีวัตถุประสงค์ 1) เพื่อออกแบบระบบผลิตไฟฟ้าเซลล์แสงอาทิตย์แบบติดตั้งบนหลังคา และ 2) เพื่อเปรียบเทียบความคุ้มค่าของโครงการระหว่างการผลิตเองกับการจ้างผลิต กรณีศึกษาโรงงานชิ้นส่วนยานยนต์แห่งหนึ่งในจังหวัดระยอง ในการออกแบบติดตั้งจะวิเคราะห์จากโหลดโปรไฟล์ และพื้นที่ติดตั้งของโรงงาน ส่วนความคุ้มค่าของโครงการจะวิเคราะห์จากต้นทุนเฉลี่ยต่อหน่วยไฟฟ้าตลอดอายุโครงการของทั้งสองรูปแบบ แล้วนำมาเปรียบเทียบกัน ผลการวิจัยครั้งนี้ พบว่าโรงงานเหมาะจะติดตั้งระบบขนาด 329.84 กิโลวัตต์ และมีต้นทุนค่าไฟฟ้าเฉลี่ยต่อหน่วยแบบผลิตเอง และจ้างผลิต 2.91 บาทต่อหน่วย และ 3.11 บาทต่อหน่วย ตามลำดับ และในกรณีนี้หากต้นทุนแผงเซลล์แสงอาทิตย์เพิ่มขึ้นมากกว่าร้อยละ 21 หรือค่าไฟฟ้าผันแปรลดลงมากกว่าร้อยละ 66 หรืออัตราผลตอบแทนขั้นต่ำที่ยอมรับได้เพิ่มขึ้นตั้งแต่ร้อยละ 12 จะทำให้ต้นทุนเฉลี่ยต่อหน่วยไฟฟ้าตลอดอายุโครงการของการผลิตเองมากกว่าการจ้างผลิต ดังนั้นจึงควรเลือกดำเนินโครงการแบบจ้างผลิต ข้อเสนอแนะจะเห็นว่าต้นทุนเฉลี่ยต่อหน่วยไฟฟ้าตลอดอายุโครงการแบบผลิตเองถูกกว่าแบบจ้างผลิตประมาณ 5,324 บาทต่อเดือน ซึ่งไม่มากนักเทียบกับเงินลงทุนโครงการ ดังนั้นการเลือกตัดสินใจควรพิจารณาปัจจัยความเสี่ยงร่วมด้วย เนื่องจากระบบจำเป็นต้องมีความมั่นคงและความต่อเนื่อง ไม่ควรเกิดเหตุไฟฟ้าตก หรือไฟฟ้าดับ ซึ่งการจ้างผลิตจะได้ผู้เชี่ยวชาญในการติดตั้งและดูแลระบบมากกว่า และในงานวิจัยนี้ยังไม่ได้มีการศึกษาในส่วนนี้ ดังนั้นการศึกษาครั้งถัดไปควรพิจารณาปัจจัยความเสี่ยงของระบบ และมูลค่าความเสียหายที่อาจจะเกิดขึ้นจากความเสี่ยงต่างๆ ร่วมด้วย

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Optimal Battery Sizing For An Industrial Factory: A Hybrid Approach Using Particle Swarm Optimization And Load Estimation, Muhammad Hammad Hassan Jan 2023

Optimal Battery Sizing For An Industrial Factory: A Hybrid Approach Using Particle Swarm Optimization And Load Estimation, Muhammad Hammad Hassan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Solar photovoltaic (PV) systems are crucial in addressing global energy demands with clean and renewable electricity. However, the intermittent nature of solar energy requires integrating batteries to ensure a reliable power supply. This study focuses on optimizing battery size for solar PV systems to balance energy storage during high irradiance periods and discharge during low sunlight, thereby enhancing system efficiency and cost-effectiveness. Accurate load forecasting and load estimation, essential for effective energy storage management, is achieved using long short-term memory (LSTM) networks, which excel in handling time series data. Particle Swarm Optimization (PSO) is then employed to determine the optimal …

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Prediction And Root-Cause Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens Jan 2023

Prediction And Root-Cause Analysis For Smart Speaker Intentional Electromagnetic Interference Attacks, Tanner Fokkens

Masters Theses

"Smart home and Internet of Things (IoT) devices have become ubiquitous in homes over the past decade. The smart speaker itself is often the device that interfaces all these devices together. Because of this, the smart speaker can become a point of attack for someone trying to exploit or hack into the smart home devices. In the past few years, it was discovered that smart speakers with microwave electromechanical system (MEMS) microphones are susceptible to intentional electromagnetic interference (I-EMI) attacks by modulating an audio command to a high-frequency carrier signal. This attack allows for command recognition for long-distances and smart …

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A Real-Time Microwave Camera Using Zero-Bias Diode Detector, Liang Liu Jan 2023

A Real-Time Microwave Camera Using Zero-Bias Diode Detector, Liang Liu

Masters Theses

"This thesis presents the design of a microwave camera that utilizes a two-dimensional array of elliptical slot antennas and diode detectors to quickly and accurately locate radiation sources. Unlike traditional scanning techniques like ESM and holography, which rely on mechanical scanning, require a long measurement time, and are prone to mechanical errors, the microwave camera operates quickly and efficiently by using electronic switching to access the output of each detector. This results in a more precise and efficient means of locating radiation sources'--Abstract, p. iii

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Static I-V Based Pim Evaluation For Spring And Fabric-Over-Foam Contacts, Kalkidan W. Anjajo, Yang Xu, Shengxuan Xia, Yuchu He, Haicheng Zhou, Hanfeng Wang, Jonghyun Park, Chulsoon Hwang Jan 2023

Static I-V Based Pim Evaluation For Spring And Fabric-Over-Foam Contacts, Kalkidan W. Anjajo, Yang Xu, Shengxuan Xia, Yuchu He, Haicheng Zhou, Hanfeng Wang, Jonghyun Park, Chulsoon Hwang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Spring Clips and Fabric-Over-Foams (FOFs) Are Widely Used in Mobile Devices for Electrical Connection Purposes. However, the Imperfect Metallic Connections Tend to Induce Passive Intermodulation (PIM), Resulting in a Receiver Sensitivity Degradation, Known as RP Desensitization. Due to the Complexity of the PIM Characterization, there is Not Yet a Way to Evaluate PIM Performance using a Simple Setup for Environments Like Factories. in This Paper, a Current-Voltage (I-V) Behavior-Based PIM Evaluation Method is Proposed and Validated with Various Metallic Contacts and Contact Forces. the Test Results Demonstrated the Feasibility of the PIM Performance Evaluation based on the Measured Static I-V …

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An Adaptive Multiple-Object Tracking Architecture For Long-Duration Videos With Variable Target Density, Joachim Lohn-Jaramillo Jan 2023

An Adaptive Multiple-Object Tracking Architecture For Long-Duration Videos With Variable Target Density, Joachim Lohn-Jaramillo

Dartmouth College Ph.D Dissertations

Multiple-Object Tracking (MOT) methods are used to detect targets in individual video frames, e.g., vehicles, people, and other objects, and then record each unique target’s path over time. Current state-of-the-art approaches are extremely complex because most rely on extracting and comparing visual features at every frame to track each object. These approaches are geared toward high-difficulty-tracking scenarios, e.g., crowded airports, and require expensive dedicated hardware, e.g., Graphics Processing Units. In hardware-constrained applications, researchers are turning to older, less complex MOT methods, which reveals a serious scalability issue within the state-of-the-art. Crowded environments are a niche application for MOT, i.e., there …

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Ocean Vector Wind Measurement Potential From The Global Precipitation Measurement Mission Using A Combined Active And Passive Algorithm, Alamgir Hossan Jan 2023

Ocean Vector Wind Measurement Potential From The Global Precipitation Measurement Mission Using A Combined Active And Passive Algorithm, Alamgir Hossan

Electronic Theses and Dissertations, 2020-2023

Ocean surface vector wind (OVW) is an essential parameter for understanding the physics and dynamics of the ocean-atmosphere system, thereby improving weather forecasting and climate studies. Satellite scatterometers, synthetic aperture radars, and polarimetric microwave radiometers have provided almost global coverage of ocean surface vector wind for the last four decades. Nonetheless, a consistent and uninterrupted long-time data record with the capability of resolving sub-diurnal variability has remained a critical challenge over the years. The Global Precipitation Measurement Mission (GPM) is a satellite mission designed to provide space-based precipitation information on a global scale with complete diurnal sampling. This dissertation presents …

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Acm Web Conference 2023, Usha Lokala, Kaushik Roy, Utkarshani Jaimini, Amit Sheth Jan 2023

Acm Web Conference 2023, Usha Lokala, Kaushik Roy, Utkarshani Jaimini, Amit Sheth

Publications

Improving the performance and explanations of ML algorithms is a priority for adoption by humans in the real world. In critical domains such as healthcare, such technology has significant potential to reduce the burden on humans and considerably reduce manual assessments by providing quality assistance at scale. In today’s data-driven world, artificial intelligence (AI) systems are still experiencing issues with bias, explainability, and human-like reasoning and interpretability. Causal AI is the technique that can reason and make human-like choices making it possible to go beyond narrow Machine learning-based techniques and can be integrated into human decision-making. It also offers intrinsic …

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Worst-Case Electromagnetic Coupling To An Accelerometer Using An Equivalent Circuit And Experimental Co-Characterization Methodology, Mohamed Z.M. Hamdalla, Thomas Ory, Aaron Harmon, Daryl G. Beetner, Victor Khilkevich, John Mcgeehan, John Willits, Anthony N. Caruso, Ahmed M. Hassan Jan 2023

Worst-Case Electromagnetic Coupling To An Accelerometer Using An Equivalent Circuit And Experimental Co-Characterization Methodology, Mohamed Z.M. Hamdalla, Thomas Ory, Aaron Harmon, Daryl G. Beetner, Victor Khilkevich, John Mcgeehan, John Willits, Anthony N. Caruso, Ahmed M. Hassan

Electrical and Computer Engineering Faculty Research & Creative Works

Worst-Case Coupling Estimation to a Complex Printed Circuit Board (PCB) System Typically Requires an Expensive Computational And/or Experimental Approach. Therefore, there is a Strong Need for a Deterministic Approach that Can Accurately Predict the Worst-Case Coupling with the Least Computational and Experimental Cost. This Work Uses a Hybrid Equivalent Circuit Approach Coupled with Experimental Measurements to Simplify Predicting the Worst-Case Coupling to an Accelerometer Board. the Predictions of the Proposed Methodology Are Validated using Experimental Measurements with Excellent Agreement.

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Modified H-Plane Sectoral Horn For Fss Sensing Applications, Logan M. Wilcox, Doyle T. Motes, Kristen M. Donnell Jan 2023

Modified H-Plane Sectoral Horn For Fss Sensing Applications, Logan M. Wilcox, Doyle T. Motes, Kristen M. Donnell

Electrical and Computer Engineering Faculty Research & Creative Works

The Use of Frequency Selective Surfaces (FSSs) as Sensors Has Found Recent Success in the Structural Health Monitoring Realm. FSS Theory Assumes Infinite FSS Dimensions and Planewave Illumination. However, in Practice, an FSS Sensor is Finite, and the Illuminating Field Varies Across the Plane of the Sensor. as Such, it is of Interest to Reduce the Nonuniformity of the Incident Electromagnetic Energy Incident on the Sensor. to This End, This Work Explores the Modification of a Standard H-Plane Sectoral Horn through the Addition of a Ridge to Generate a Uniform Electric Field over a Specified Region of Interest. in Addition …

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Pcb Based Modulated Scatter With Enhanced Modulation Depth, Dylan A. Crocker, Kristen M. Donnell Jan 2023

Pcb Based Modulated Scatter With Enhanced Modulation Depth, Dylan A. Crocker, Kristen M. Donnell

Electrical and Computer Engineering Faculty Research & Creative Works

The Modulated Scatterer Technique (MST) Has Shown Promise for Applications in Microwave Imaging, Electric Field Mapping, and Materials Characterization. Traditionally, MST Scatterers Are Dipoles Centrally Loaded with an Element Capable of Modulation (E.g., a PIN Diode). by Modulating the Load Element State, the Scattered Fields Are Also Modulated. However, Due to the Small Size of Such Scatterers, It Can Be Difficult to Reliably Detect the Response. Increasing the Modulation Depth (MD) of the Scattered Signal May Improve Detectability. This Paper Presents Simulations and Measurements of PCB-Based MST Elements that, through Reactive Loading, Are Designed to Be Electrically Invisible during the …

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Analysis And Modeling Framework Of Common Mode Noise In A Three-Phase Motor System, Manish K. Mathew, Xin Yan, Yuandong Guo, Tanner Fokkens, Li Shen, Daryl G. Beetner, Donghyun Kim Jan 2023

Analysis And Modeling Framework Of Common Mode Noise In A Three-Phase Motor System, Manish K. Mathew, Xin Yan, Yuandong Guo, Tanner Fokkens, Li Shen, Daryl G. Beetner, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic Interference (EMI) Issue is One of the Major Constraints of Power Electronic Converters, Especially for Variable-Speed Systems. in This Work, the Common Mode Noise in a Three-Phase Motor System is Analyzed and Modeled. the Three-Phase Pulse-Width Modulation (PWM) Inverter Creates High Magnitudes of Dv/dt and Di/dt, Resulting in Common Mode Noise and Disturbance Power. in This Paper, the Common Mode Noise and Disturbance Power Modeling Method Are Proposed for Three-Phase Motor Systems. the Proposed Equivalent Circuit Model Comprises Detailed Models for Insulated Gate Bipolar Transistors (IGBTs), EMI Filters, a Three-Phase Motor and a Printed Circuit Board (PCB). the Proposed …

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Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim Jan 2023

Analysis On Extraction Of Potential Radiated Emission Limit Line For Data Center Equipment From 10 Ghz To 40 Ghz, Zhekun Peng, Wei Zhang, Jong Hwa Kwon, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

The Radiated Emission (RE) Potential Limit Line for Router System is Analyzed from 10 GHz to 40 GHz based on CISPR TR 16-4-4 Standard. Statistical Data is Collected for the Limit Line Extraction from Measurement, Numerical Analysis, 3D Full-Wave Simulation and Literature Studies. All the Factors Considered in Limit Line Calculation Are Analyzed for Data Center Equipment Operation. the Result of Extracted Potential Limit Line Shows the Rising Limit Line between 10 GHz and 40 GHz Frequency Band for Potential Future Radiated Emission Limit Line above 40 GHz Targeted for High-Speed Equipment Radiated Emission. This Paper is Not a Standard …

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Challenges And Solutions For Automotive Ota Testing, Jiyu Wu, Yihong Qi, Penghui Shen, Wei Yu, Lie Liu, James L. Drewniak Jan 2023

Challenges And Solutions For Automotive Ota Testing, Jiyu Wu, Yihong Qi, Penghui Shen, Wei Yu, Lie Liu, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

OTA (Over-The-Air) Testing is Essential for Developing Assisted and Autonomous Driving Systems in Vehicles, as It Plays a Crucial Role in the Localization, Perception, and Intelligent Driving Capabilities of ICVs (Intelligent Connected Vehicles). Automotive Antennas, Typically Much Smaller in Size Than the Vehicle itself and Can Be Located in Various Positions, Require Spherical Near-Field Measurement for OTA Testing. While There Are Established Standards for OTA Testing Methods and Uncertainties for Mobile Devices, Base Stations, and Satellite Components, There Are Still Many Challenges in the OTA Testing of Automotive Systems. These Challenges, specifically in SISO (Single Input Single Output) and MIMO …

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Roughness Losses Computation Through The Partial Elements Equivalent Circuit Method, Fabrizio Loreto, Daniele Romano, Giulio Antonini, Albert E. Ruehli, Mauro Lai Jan 2023

Roughness Losses Computation Through The Partial Elements Equivalent Circuit Method, Fabrizio Loreto, Daniele Romano, Giulio Antonini, Albert E. Ruehli, Mauro Lai

Electrical and Computer Engineering Faculty Research & Creative Works

Conductor Loss Caused by Conductor Surface Roughness is a Critical Aspect in the Design of High-Speed Electronic Systems Since It Significantly Affects their Performances. Well-Established Roughness Models Have Been Proposed over the Years but They Have Been Applied Only to the Transmission Line Models of Interconnects. Typically, the Roughness Models Are Used to Modify the Per-Unit-Length Impedance of the Transmission Line Which is Extracted by 2D Model Methods. The Aim of This Work is to overcome This Limitation Thus Making It Possible to Model Roughness Conductors in the Framework of 3D Full-Wave Methods. More Precisely, it is Presented How to …

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A Thermal-Aware Dc-Ir Drop Analysis For 2.5d Ic, Shengxuan Xia, Baris M. Dogruoz, Yansheng Wang, Songping Wu, Siqi Bai, Chulsoon Hwang, Zhonghua Wu Jan 2023

A Thermal-Aware Dc-Ir Drop Analysis For 2.5d Ic, Shengxuan Xia, Baris M. Dogruoz, Yansheng Wang, Songping Wu, Siqi Bai, Chulsoon Hwang, Zhonghua Wu

Electrical and Computer Engineering Faculty Research & Creative Works

With the Trend of Higher Integration, 3D/2.5D IC Solutions Such as CoWoS (Chip-On-Wafer-On-Substrate) Have Become More Popular in Recent Years. Power Integrity (PI) is Always a Critical Part of the Design Especially When the Power Consumption Requirements Are Important Specs for High-Performance Computing. DC-IR Drop is One of the Criteria within Power Integrity Considerations. However, Ordinary Electrical-Only Simulation for DC-IR Drop Will Be an Underestimation Because It Neglects the Copper Conductivity Dropping Due to the Temperature Rising. Thus, an Engineering Solution for Electrical-Thermal Co-Simulation is Important to Help to Provide Both an Accurate PI Analysis and the Proper Mitigations of …

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Near Field Scanning-Based Emi Radiation Root Cause Analysis In An Ssd, Xiangrui Su, Wenchang Huang, Junghee Cho, Joonki Paek, Chulsoon Hwang Jan 2023

Near Field Scanning-Based Emi Radiation Root Cause Analysis In An Ssd, Xiangrui Su, Wenchang Huang, Junghee Cho, Joonki Paek, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

In Modern Portable Electronic Devices, Solid-State Drives (SSDs) Are Commonly Used and Have Been Identified as One of the Dominant Electromagnetic Interference (EMI) Noise Sources that Can Cause RF Desensitization Issues. in This Paper, the EM Emission Source from an SSD Module is Identified and Analyzed using Near Field Scanning and Dipole Moment Source Reconstruction. the Identified Noise Current Path Including the Power Management Integrated Circuit and the Decoupling Capacitor is Validated with the Assistance of Full-Wave Simulation. the Measured Noise Voltage is Used as an Excitation in the Simulation and the Simulated Near Fields Showed a Good Correlation with …

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A Real-Time Microwave Camera Prototype With Zero-Bias Diode Detectors For Emi Source Imaging, Xin Yan, Liang Liu, Victor Khilkevich Jan 2023

A Real-Time Microwave Camera Prototype With Zero-Bias Diode Detectors For Emi Source Imaging, Xin Yan, Liang Liu, Victor Khilkevich

Electrical and Computer Engineering Faculty Research & Creative Works

Emission Source Microscopy (ESM) Could Be Utilized to Localize the Electromagnetic Interference (EMI) Sources that Contribute to the Far-Field Radiation. in Those Cases, the Electrical Field over a Two-Dimensional Plane is Collected by Mechanical Scanning, Resulting in a Long Measurement Time and the Presence of Mechanical Errors. in This Work, a Microwave Camera based on a Two-Dimensional Array of Elliptical Slot Antennas and Diode Detectors is Presented. Multiplexers Are Utilized to Access the Output of Each Detector and the Scanning of the Whole Array Could Be Done Multiple Times Per Second.

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Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim Jan 2023

Reconfigurable Intelligent Surface (Ris) Design For 5g N260 Frequency Band, Reza Yazdani, Manish Kizhakkeveettil Mathew, Zhekun Peng, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, a New Low Profile Reconfigurable Intelligent Surface Design with High Resolution Steering Reflector and Wide Frequency Band Width is Proposed at N260 Frequency Band, Used for 5G New Radio Applications. the Dynamic Reflection Phase and Tunability is Realized by Integrating of Varactor Diode with Each Unit Cell. This Study Presents Design Procedures, Reflection Simulation Verifications, and the Effects of Important Parameters on the Performance of the Proposed Novel Resonant Unit Cell. the Proposed Unit Cell Offers a Dynamic Reflection Phase Range of More Than 270° at a Wide Frequency Bandwidth. Simulation Results of Beam Steering Capability in …

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On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang Jan 2023

On Finding An Equivalent Force To Mimic The Multilayer Ceramic Capacitor Vibration, Yifan Ding, Jianmin Zhang, Mingfeng Xue, Shengyin Ding, Benjamin Leung, Eric A. Macintosh, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

The Multilayer Ceramic Capacitor (MLCC) Can Vibrate Due to the Piezoelectric Effect When There is AC Noise on the Power Rail. the Vibration of the Capacitor Will Generate a Force on the PCB and Thus Cause the PCB Vibration and Audible Problems May Occur. the Work in This Paper Finds an Equivalent Force with Similar Behavior to the MLCC-Generated Force. the Force is Controllable and Knowable and Thus Can Mimic the Capacitor Vibration on the PCB.

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High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim Jan 2023

High-Speed Differential Via Optimization Using A High-Accuracy And High-Bandwidth Via Model, Chaofeng Li, Kevin Cai, Manish Kizhakkeveettil Mathew, Seyedmehdi Mousavi, Muqi Ouyang, Bidyut Sen, Donghyun Kim

Electrical and Computer Engineering Faculty Research & Creative Works

A Physics-Based Equivalent Model of the High-Speed Differential Via Pair with High Accuracy and High Bandwidth is Proposed for the First Time. the Proposed Physics-Based Equivalent Circuit Model of the Differential Via Pair Includes the Effect of Adjacent Ground (GND) Vias. the Proposed Model is Verified using 3D Full-Wave Numerical Simulation Results. in Addition, the Change in Electrical Performance Due to Change in Anti-Pad Radius, the Via Pitch and the GND-Via-To-Differential-Via Distance is Analyzed. based on the Analysis, Electrical Performance of Differential Via Pair Can Be Accurately and Rapidly Optimized with Respect to Design Parameters, such as the Via Pitch, …

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Augmented Genetic Algorithm V2 With Reinforcement Learning For Pdn Decap Optimization, Haran Manoharan, Jack Juang, Hanfeng Wang, Jingnan Pan, Kelvin Qiu, Xu Gao, Chulsoon Hwang Jan 2023

Augmented Genetic Algorithm V2 With Reinforcement Learning For Pdn Decap Optimization, Haran Manoharan, Jack Juang, Hanfeng Wang, Jingnan Pan, Kelvin Qiu, Xu Gao, Chulsoon Hwang

Electrical and Computer Engineering Faculty Research & Creative Works

Genetic Algorithms (GAs) Use Many Hyperparameters, and Tuning These Parameters Can Determine the Optimization Performance. a GA with an Augmented Initial Population Was Proposed for Decap Optimization but It Had Convergence Issues by Getting Stuck in the Local Minimum. This Work Uses a Reinforcement Learning (RL) Approach to Adaptively Tune the Hyperparameters of GA during its Operation. with This Approach, the Agent Tries to Change the Parameters So that the GA Does Not Get Stuck in the Local Minimum. the Proposed Method Combining the RL Agent and Augmented GA Showed Better Performance in Terms of Solution Quality and Time Cost. …

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Passive Testing Of Electrically Small Antennas In Electronic Systems, Bin Xiao, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi Jan 2023

Passive Testing Of Electrically Small Antennas In Electronic Systems, Bin Xiao, Lidong Chi, Fuhai Li, James L. Drewniak, Gang Feng, Yihong Qi

Electrical and Computer Engineering Faculty Research & Creative Works

In This Paper, a Measurement Scheme, Which Eliminates the Interference of the Common Mode Current, for Electrically Small Antennas is Proposed. Firstly, the Causes and Effects of Common Mode Currents Appearing in Passive Testing Are Analyzed. Then, the Influence of Different Outlet Points of Coaxial Cable on the Passive Testing of Antenna is Studied Experimentally and Numerically. According to the Distribution of the Common Mode Currents on the Ground Plane When the Coaxial Cable Feeds the Antenna, the Minimum Current Point is Selected as the Outlet Point of the Coaxial Cable to Reduce the Influence of Common Mode Current. Additionally, …

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Power Supply Induced Jitter (Psij) Modeling, Analysis, And Optimization Of High Bandwidth Memory (Hbm) I/O Interface, Hyunwook Park, Taein Shin, Seongguk Kim, Keeyoung Son, Keunwoo Kim, Boogyo Sim, Hyungmin Kang, Seonguk Choi, Jiwon Yoon, Hyunwoo Kim, Chulsoon Hwang, Joungho Kim Jan 2023

Power Supply Induced Jitter (Psij) Modeling, Analysis, And Optimization Of High Bandwidth Memory (Hbm) I/O Interface, Hyunwook Park, Taein Shin, Seongguk Kim, Keeyoung Son, Keunwoo Kim, Boogyo Sim, Hyungmin Kang, Seonguk Choi, Jiwon Yoon, Hyunwoo Kim, Chulsoon Hwang, Joungho Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Power Supply Induced Jitter (PSIJ) in High Bandwidth Memory (HBM) I/O Interface is Modeled, Analyzed, and Optimized for Different HBM Generations. Precise Models for VDDQ Power Distribution Networks (PDNs), Simultaneous Switching Current (SSC), and Jitter Sensitivities of the Clock and I/O Buffers Are Implemented for PSIJ Estimation. Compared to the SPICE, the Average Error Rate of the Estimated PSIJ is 4.26 %. the Critical Frequency Bands in the Jitter Spectrum Where Large Jitters Occur Are Derived by Comparing the Relative Impact of the Modeled Interface Factors in the Frequency Domain. for the Optimization, On-Chip and On-Interposer Decoupling Capacitor (Decap) Placement …

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Guest Editorial Special Section On The 2022 Ieee International Instrumentation And Measurement Technology Conference, Sergio Rapuano, Kristen M. Donnell, Pawel Niewczas Jan 2023

Guest Editorial Special Section On The 2022 Ieee International Instrumentation And Measurement Technology Conference, Sergio Rapuano, Kristen M. Donnell, Pawel Niewczas

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Cascaded Sapphire Fiber Bragg Gratings Inscribed By Femtosecond Laser For Molten Steel Studies, Dinesh Reddy Alla, Deva Prasad Neelakandan, Farhan Mumtaz, Rex E. Gerald, Laura Bartlett, Ronald J. O'Malley, Jeffrey D. Smith, Jie Huang Jan 2023

Cascaded Sapphire Fiber Bragg Gratings Inscribed By Femtosecond Laser For Molten Steel Studies, Dinesh Reddy Alla, Deva Prasad Neelakandan, Farhan Mumtaz, Rex E. Gerald, Laura Bartlett, Ronald J. O'Malley, Jeffrey D. Smith, Jie Huang

Electrical and Computer Engineering Faculty Research & Creative Works

This research reports a distributed fiber optic high-temperature sensing system tailored for applications in the steel industry and various other sectors. Recent advancements in optical sensor technology have led to the exploration of sapphire crystal fibers as a solution for sensing in harsh environments. Utilizing a femtosecond (fs) laser, cascaded fiber Bragg gratings (FBGs) were meticulously fabricated within a multimode sapphire optical fiber. These FBGs endowed the system with distributed sensing capabilities and underwent rigorous testing under extreme temperatures, reaching up to 1,800 °C. The study delves into the investigation of the FBG reflection spectrum, facilitated by the development of …

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Simulating Multi-Tapered Coaxial Baluns With An Isogeometric Surface Integral Equation Method, Maximilian Nolte, Riccardo Torchio, Sebastian Schops, Albert E. Ruehli Jan 2023

Simulating Multi-Tapered Coaxial Baluns With An Isogeometric Surface Integral Equation Method, Maximilian Nolte, Riccardo Torchio, Sebastian Schops, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

In this contribution we present the numerical analysis of multi-tapered coaxial baluns simulated with an Iso geometric surface integral equation method and demonstrate thereby an application of the work, which completes the studies on electrostatics conducted in [6] with the full-wave case.

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Multiple Uav-Lidar Placement Optimization Under Road Priority And Resolution Requirements, Zachary Osterwisch, Omar Rinchi, Ahmad Alsharoa, Hakim Ghazzai, Yehia Massoud Jan 2023

Multiple Uav-Lidar Placement Optimization Under Road Priority And Resolution Requirements, Zachary Osterwisch, Omar Rinchi, Ahmad Alsharoa, Hakim Ghazzai, Yehia Massoud

Electrical and Computer Engineering Faculty Research & Creative Works

An unmanned aerial vehicle (UAV) integrated with the remote sensing technology of light detection and ranging (LiDAR) can provide accurate and real-time road traffic information. In this paper, we propose to equip UAVs with LiDAR sensors for Intelligent Transportation Systems (ITS) applications. The goal is to find the optimal 3D placement of multiple UAV-LiDAR (ULiDs) for a given road segmentation. We formulate an optimization problem to find the optimal placement such that the road coverage efficiency is maximized. The optimization problem is constrained by notable ULiD specifications such as field-of-view (FoV), point-cloud density, geographic information system (GIS) location, and road …

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Improved Intelligent Ledger Construction For Realistic Iot Blockchain Networks, Charles Rawlins, S. (Sarangapani) Jagannathan Jan 2023

Improved Intelligent Ledger Construction For Realistic Iot Blockchain Networks, Charles Rawlins, S. (Sarangapani) Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

Scalability is essential for next generation blockchain technology to integrate with large mobile networks like Internet of Things (IoT). The IOTA distributed ledger protocol has combined transaction generation and verification to address this, but at the expense of increased reliance on connectivity to resolve conflicts with a novel ledger data structure. Intelligent Ledger Construction (ILC) was proposed as an auditable lightweight reinforcement-learning scheme to address this constraint with proposal of local conflict resolution with machine-learning classification. This effort presents an improved reliability reward model to enhance training for ILC and further reduce adversarial gaming and resource usage. Testing this revision …

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Advances In Fiber-Optic Extrinsic Fabry-Perot Interferometric Physical And Mechanical Sensors: A Review, Chen Zhu, Hongkun Zheng, Lingmei Ma, Zheyi Yao, Bo Liu, Jie Huang, Yunjiang Rao Jan 2023

Advances In Fiber-Optic Extrinsic Fabry-Perot Interferometric Physical And Mechanical Sensors: A Review, Chen Zhu, Hongkun Zheng, Lingmei Ma, Zheyi Yao, Bo Liu, Jie Huang, Yunjiang Rao

Electrical and Computer Engineering Faculty Research & Creative Works

Fabry-Perot Interferometers Have Found a Multitude of Scientific and Industrial Applications Ranging from Gravitational Wave Detection, High-Resolution Spectroscopy, and Optical Filters to Quantum Optomechanics. Integrated with Optical Fiber Waveguide Technology, the Fiber-Optic Fabry-Perot Interferometers Have Emerged as a Unique Candidate for High-Sensitivity Sensing and Have Undergone Tremendous Growth and Advancement in the Past Two Decades with their Successful Applications in an Expansive Range of Fields. the Extrinsic Cavity-Based Devices, I.e., the Fiber-Optic Extrinsic Fabry-Perot Interferometers (EFPIs), Enable Great Flexibility in the Design of the Sensitive Fabry-Perot Cavity Combined with State-Of-The-Art Micromachining and Conventional Mechanical Fabrication, Leading to the Development of …

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