Electrical and Electronics Commons^™

การวางแผนวิทยุของการใช้ระบบ 5g และ 6g ร่วมกันสำหรับการบริการบรอดแบนด์เคลื่อนที่, ศุภชาติ จีนคง

Chulalongkorn University Theses and Dissertations (Chula ETD)

ในอนาคตอันใกล้เทคโนโลยี 6G จะเริ่มเข้ามามีบทบาทสำคัญอย่างมาก 6G มีจุดมุ่งหมายที่จะให้บริการด้วยอัตราข้อมูลที่สูงถึงระดับ Tbps และมี Latency ต่ำมาก ซึ่งการนำเทคโนโลยี 6G เข้ามาใช้งานจะช่วยแก้ปัญหาความคับคั่งของ Traffic ในช่วงเวลาที่มีอุปกรณ์ใช้งานจำนวนมากได้ ในอนาคตจะมีบริการที่ต้องการใช้อัตราข้อมูลที่สูงขึ้นอีกมาก เช่น Virtual Reality (VR) Extended Reality (XR) และ Hologram ซึ่งเป็นบริการที่ต้องการอัตราข้อมูลระดับสูง โดยการนำเทคโนโลยี 6G เข้ามาให้บริการจะสามารถช่วยให้สามารถใช้งานเทคโนโลยีเหล่านี้ได้เพียงพอ วิทยานิพนธ์นี้มีจุดประสงค์ประเมินและเสนอแนวทางการวางแผนวิทยุของระบบ 5G และ 6G ให้ใช้งานร่วมกัน ซึ่งพิจารณาจากอัตราการใช้งานข้อมูลรวมสำหรับบริการบรอดแบนด์เคลื่อนที่ ในพื้นที่ต่าง ๆ อัตราข้อมูลการให้บริการของสถานีฐานทั้ง 5G และ 6G และพื้นที่ครอบคลุมของทั้ง 5G และ 6G ที่คำนวณจากการสูญเสียเชิงวิถี และแสดงตำแหน่งและพื้นที่ครอบคลุมของสถานีฐานบนพื้นที่ที่กำหนด วิทยานิพนธ์นี้แสดงผลการวิเคราะห์บนพื้นที่ตัวอย่าง Dense Urban เทียบเท่าได้กับพื้นที่ศูนย์การค้าย่านสยามสแควร์ และพื้นที่ตัวอย่าง Urban เทียบเท่าได้กับพื้นที่ชุมชนอยู่อาศัยในตำบลบางปู จังหวัดสมุทรปราการ โดยเลือกใช้งานสถานีฐานของ 5G ให้ครอบคลุมพื้นที่ให้บริการทั้งหมด และใช้สถานีฐานของ 6G ในตำแหน่งที่มีผู้คนใช้งานเป็นจำนวนมาก ซึ่งผลลัพธ์ของงานวิทยานิพนธ์นี้สามารถนำไปใช้วิเคราะห์ในการวางพื้นที่ติดตั้งโครงข่ายเบื้องต้น เพื่อตั้งสถานีฐาน 5G และ 6G สำหรับขยายพื้นที่ให้บริการต่อไปในอนาคต

Meltpondnet: A Swin Transformer U-Net For Detection Of Melt Ponds On Arctic Sea Ice, Ivan Sudakow, Vijayan K. Asari, Ruixu Liu, Denis Demchev

Electrical and Computer Engineering Faculty Publications

High-resolution aerial photographs of Arctic region are a great source for different sea ice feature recognition, which are crucial to validate, tune, and improve climate models. Melt ponds on the surface of melting Arctic sea ice are of particular interest as they are sensitive and valuable indicators and are proxy to the processes in the Arctic climate system. Manual analysis of this remote sensing data is extremely difficult and time-consuming due to the complex shapes and unpredictable boundaries of the melt ponds, and that leads to the necessity for automatizing the processes. In this study, we propose a robust and …

Circuit Optimization Techniques For Efficient Ex-Situ Training Of Robust Memristor Based Liquid State Machine, Alex Henderson, Christopher Yakopcic, Cory Merkel, Steven Harbour, Tarek M. Taha, Hananel Hazan

Electrical and Computer Engineering Faculty Publications

Spiking neural network hardware offers a high performance, power-efficient and robust platform for the processing of complex data. Many of these systems require supervised learning, which poses a challenge when using gradient-based algorithms due to the discontinuous properties of SNNs. Memristor based hardware can offer gains in portability, power reduction, and throughput efficiency when compared to pure CMOS. This paper proposes a memristor-based spiking liquid state machine (LSM). The inherent dynamics of the LSM permit the use of supervised learning without backpropagation for weight updates. To carry out the design space evaluation of the LSM for optimal hardware performance, several …

การศึกษาเปรียบเทียบและพัฒนาวิธีการการจัดกลุ่มโหลดสำหรับการจ่ายไฟฟ้าแบบไมโครกริด, จารุพจน์ ถนอมรักษ์

Chulalongkorn University Theses and Dissertations (Chula ETD)

การประยุกต์ใช้ไมโครกริดเป็นการใช้เทคโนโลยีในการพัฒนาระบบจำหน่ายไฟฟ้า มุ่งเน้นการพึ่งพาพลังงานภายในไมโครกริดตนเองเป็นสำคัญ และยังสามารถเพิ่มประสิทธิภาพและสร้างความน่าเชื่อถือให้กับระบบไฟฟ้าซึ่งสามารถประเมินค่าทางเศรษฐกิจได้ การแยกโดดระบบไฟฟ้าไมโครกริดเป็นวิธีหนึ่งที่สามารถป้องกันระบบไฟฟ้าดับอย่างทันท่วงที ซึ่งมีเหตุเนื่องมาจากความผิดพร่องจากกริดไฟฟ้าหลักซึ่งเป็นเหตุให้เกิดไฟฟ้าดับในหลายส่วนของระบบไฟฟ้า วิทยานิพนธ์ฉบับนี้เสนอวิธีการจัดกลุ่มโหลดให้เป็นไมโครกริดเพื่อเป็นระบบไฟฟ้าแบบแยกโดด โดยการดัดแปลงและประยุกต์ใช้ขั้นตอนวิธี การจัดกลุ่มเชิงพื้นที่ตามความหนาแน่นของแอปพลิเคชันที่มีสัญญาณรบกวนบนสายป้อนไฟฟ้า ให้เป็นส่วนหนึ่งในขั้นตอนการกลายพันธุ์ของขั้นตอนวิธีเชิงพันธุกรรม เพื่อให้เกิดประโยชน์ต่อการบริหารโครงข่ายไฟฟ้า ผลลัพธ์จากวิทยานิพนธ์ฉบับนี้แสดงให้เห็นประโยชน์ของขั้นตอนวิธีที่เสนอต่อการจัดกลุ่มไมโครกริด เพื่อให้ได้ตัวประกอบภาระเฉลี่ยของแต่ละกลุ่มไมโครกริดบนสายป้อนไฟฟ้าสูงสุด

Self-Oscillating Induction Heater, Patrick Rice

Dissertations, Master's Theses and Master's Reports

This report develops a control system to keep an induction heater in resonance. When a metallic workpiece is inserted in the air core of the workcoil, the resonant frequency changes. Different workpiece materials affect the resonant frequency and power. This presents a problem since changing the resonant frequency of the circuit while keeping the frequency constant reduces the maximum power of the circuit. Finite element analysis is used to find the circuit parameters of the workcoil and workpiece interaction. A non-linear controller which oscillates based on the resonant frequency of an LC tank is created. Nyquist and describing function analysis …

Robust Control Strategies For Optimal Operation Of Distributed Generation In Smart Microgrids, Chi-Thang Phan-Tan

Theses

The high penetration of PV systems and fast communications networks increase the potential for PV inverters to support the stability and performance of smart grids and microgrids. PV inverters in the distribution network can work cooperatively and follow centralized and decentralized control commands to optimize energy production while meeting grid code requirements. However, there are older autonomous inverters that have already been installed and will operate in the same network as smart controllable ones. This research proposes a decentralized optimal control (DOC) that performs multi-objective optimization for a group of PV inverters in a network of existing residential loads and …

Model-Based Cognitive Communications For Low-Power Wireless Networks, Indika Sanjeewa Abeywickrama Dhanapala

Theses

Our world is increasingly being instrumented with low-power wireless networks that deliver data for diverse application domains such as energy management, health and well-being, security, and other Internet of Things services. As these wireless networks operate in the unlicensed radio spectrum while co-existing with various other communication networks, their communication reliability and energy efficiency are affected by the radio environment. Because of this vulnerability to radio interference, low-power wireless networks may be unable to deliver their application requirements and be inefficiently consuming energy, functioning as a low-dependability network. The situation is exacerbated in indoor environments such as office and residential …

Spray Deposition Of Sustainable Plant Based Graphene In Thermosetting Carbon Fiber Laminates For Mechanical, Thermal, And Electrical Properties, Daniel W. Mulqueen, Siavash Sattar, Thienan Le, Oleksandr G. Kravchenko

Mechanical & Aerospace Engineering Faculty Publications

Graphene has generated substantial interest as a filler due to its exceptional strength, flexibility, and conductivity but faces obstacles in supply and implementation. A renewable, plant-based graphene nanoparticle (pGNP) presents a more accessible filler with the same properties as mineral graphenes. In this study, we examine the effects of pGNP, which was sprayed on a carbon fiber/epoxy prepreg at loadings from 1.1 to 4.2 g/m². The study considered the mechanical, thermal, and electrical properties of pGNP-composite. An even particle dispersion was achieved using a spray application of pGNP in a water/alcohol suspension with the addition of surfactants and …

Recent Advancements In Electrochemical Conversion Of Carbon Dioxide, Nandan Nag, Amit Kumar, Sumit Sharma, Sandeep Kumar, Amit K. Thakur

Civil & Environmental Engineering Faculty Publications

Electrochemical reduction of carbon dioxide into eco-friendly and clean products is a promising approach to eradicate pollution. Although carbon dioxide emission is inhibited by the advent of renewable sources of energy, it is present in the atmosphere and needs to be cleaned. The reduction of carbon dioxide from atmospheric gases can be accomplished by its adsorption and subsequent transportation to electrolytic chambers, where it is reduced to hydrocarbons, organic acids or carbonates. This review focuses on developing a three compartment electrochemical cell to reduce carbon dioxide used as a catholyte. Various factors affecting the electrochemical reduction of carbon dioxide and …

Autonomous Coffee Brewing System, Lillian Gonzalez, Landon Miller, Tyler Moff, Benjamin Vitu

Williams Honors College, Honors Research Projects

Coffee consumers want an affordable, high-quality cup of coffee that takes minimal time to brew and does not excessively contribute plastic to landfills. A fully autonomous system which utilizes whole coffee beans, water, and filters to brew coffee was designed to meet this need. This system accepts user requests which specify the brew’s portion size, water temperature, and brew strength, as well as the time which the system should begin the brewing process. Occasional maintenance to empty the system’s built-in waste receptacle or resupply the system with water, coffee beans, or filters is the only user intervention required. This report …

Garden Bot: Autonomous Home Garden Weed Removal Robot, Brendon Lovejoy, Robert Connolly, Isaac Lucas, Stevan Veselinov

Williams Honors College, Honors Research Projects

With frequent weeding being a tedious chore and an essential task for a successful garden, there is need for an automated method of handling this routine. Existing technologies utilize computer vision, GPS, multiple units and other tools to remove weeds from garden plots. However, these solutions are often complex and expensive, suited for large agricultural plots in contrast to small-scale home gardens. In addition, many of these technologies, along with manual tillers and cultivators suited for home use, are unable to perform weeding within rows of crops in a process known as intra-row weeding. The Garden Bot is an autonomous, …

Autonomous Wildfire Detection System, Matthew Pyle, Nick Garrett

Williams Honors College, Honors Research Projects

According to the National Fire Protection Association Journal, federal wildfire suppression costs in the United States have risen from an annual average of about $425 million from 1985 to 1999 up to $1.6 billion from 2000 to 2019. On average, more than 200,000 acres in the United States are burned per year due to wildfires, with more than 700,000 acres burned in 2020 alone. With the risk of wildfire ever rising, there is a need for better early detection of remote wildfires, as existing methods often include long delays like satellites or rely on human lookout towers. The objective is …

Smart Kettlebell, Cole Russell, Patrick Davis, Ryan Deboer, Isaac Stecker

Williams Honors College, Honors Research Projects

The purpose of design team 08’s senior design project is to create and implement a workout device that will be able to calculate the caloric expenditure, repetitions, and length of a workout. Once the duration of a workout is completed, the user metrics will be communicated from the kettlebell system to a user application via Bluetooth. The caloric expenditure will be used using the data that is provided from the accelerometer. The duration of the workout will be controlled using a push button that is connected to the kettlebell system that will allow for the start and stop of a …

Chemical Clean Automated Loader, Jordyn Bryner

Williams Honors College, Honors Research Projects

TTM Technologies (TTM) is a global printed circuit board (PCB) manufacturer. The work described in this report was completed in the TTM North Jackson, Ohio location. This plant focuses primarily on the manufacturing of rigid and rigid-flex PCBs for the aerospace and defense industry. TTM North Jackson has an ongoing labor dependency issue due to the shortage of workers the nation is facing. To solve this problem, TTM has focused the efforts of their new engineers and interns on automating processes that are labor dependent. The goal is to provide design guidance to be used later by TTM to automate …

Smart Uv-C Disinfectant Module, Nicole Baldy, Luke Rogers, Haitham Saleh

Williams Honors College, Honors Research Projects

The Smart UV Disinfectant device shall sanitize objects which are 18”x14”x8” or smaller and less than 20 lbs. using UV-C light. This device should contain many safety measures to prevent human and animal exposure to the UV-C light and have no public touchpoints to operate the interface. In order to achieve the first objective, this device shall contain a "sanitizing chamber" which completely encloses the object to be sanitized to prevent outside exposure with detection of any lifeforms inside of the chamber; for the second objective, it will contain a wireless interface to an Android application which can be used …

"Demeter" Soil Monitoring System, Ryan Matthews, Rachel Rummer, Temilolu Fayomi, Alex Fuller

Williams Honors College, Honors Research Projects

The purpose of this project is to develop a soil monitoring system that can remotely sense and relay soil conditions back to a user. The deMETER soil probe, Demeter is the Greek goddess of the harvest, is designed to aid hobbyist gardeners, small-scale farms, and nurseries to monitor their dynamic soil conditions and maximize their harvest. The probe is a self-powered system that can monitor the moisture and essential nutrients of the soil profile to determine which areas should receive water and fertilizer. This would significantly cut water and fertilizer waste. The solution will include an embedded system with sensors …

Magic: The Gathering Card Virtualizer, Vincent Garbonick, Jacen C. Conlan, Jaret A. Varn

Williams Honors College, Honors Research Projects

Any well-versed Magic: The Gathering (MTG) player or collector knows how difficult it can be to keep track of all cards in their collection. Some spend hours searching for that one specific card, and others are constantly scouring the internet for how much their collection costs. However, this issue does not only affect casual fans. Resale companies spend hours a day determining the costs of cards, and tournament judges painstakingly check players’ decks to ensure they are not cheating. To assist with these struggles, the design team proposed to create the MTG Card Virtualizer. This device scans MTG playing cards …

Development Of Dc Circuit Breakers For Medium-Voltage Electrified Transportation, Trevor Morgan Arvin

Theses and Dissertations--Electrical and Computer Engineering

Medium-voltage DC (MVDC) distribution is an enabling technology for the electrification of transportation such as aircraft and shipboard. One main obstacle for DC distribution is the lack of adequate circuit fault protection. The challenges are due to the rapidly rising fault currents and absence of zero crossings in DC systems compared to AC counterparts. Existing DC breaker solutions lack comprehensive consideration of energy efficiency, power density, fault interruption speed, reliability, and implementation cost.

In this thesis, two circuit topologies of improved DC circuit breakers are developed: the resonant current source based hybrid DC breaker (RCS-HDCB) and the high temperature superconductor …

Parametric Average-Value Modeling, Simulation, And Characterization Of Machine-Rectifier Systems, Isuje Ojo

Theses and Dissertations--Electrical and Computer Engineering

There are many techniques for modeling and simulation of synchronous machine-rectifier systems. The more common approaches are the detailed and average-value modeling techniques. The detailed simulation technique takes into account the details of the diode switching and is both very accurate and very expensive in terms of computational resources. To alleviate this disadvantage, the average-value modeling technique is often utilized. In this approach, the details of diode switching are neglected or averaged. In that light, the work presented herein proposes a unique saliency-sensitive parametric average-value model (SSPAVM) of the synchronous machine-rectifier system. This model extends existing parametric average-value models to …

Optimal Operation Schedule Of Battery Energy Storage System For Supporting Variable Renewable Energy In Generation System, Chalermjit Klansupar

Chulalongkorn University Theses and Dissertations (Chula ETD)

Variable renewable energy (VRE) generation alters residual demand curves, leading to high operating costs for conventional generators. Additionally, the variable nature of VRE causes a mismatch between electricity demand and generation, resulting in greater expected energy not supplied (EENS) values, which represent a critical component of power generation costs. To alleviate the impact of VRE, utility-scale battery energy storage systems (BESSs) provide ancillary services. The BESSs’ general applications are spinning reserve, regulation, and ramping. This paper proposes a method to determine daily operation schedules for grid-scale BESSs, compensating for the negative impacts of VRE on operating costs, power generation reliability …