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2022

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Full-Text Articles in Engineering

Gauging Student Interest In A Leed Ga Exam Preparation Technical Elective Course, Hailey Lancaster Jun 2022

Gauging Student Interest In A Leed Ga Exam Preparation Technical Elective Course, Hailey Lancaster

Construction Management

Being a LEED Green Associate (LEED GA) demonstrates a fundamental understanding of sustainable building principles and practices. Since green building is at the forefront of construction, there is no better way for Construction Management students to enter the industry prepared in this area than by taking the LEED General Associate exam. This paper is a case study that obtains students’ perspectives on implementing a new Construction Management technical elective course that will prepare students to successfully take and pass the LEED GA exam. A survey was conducted to gauge student familiarity with sustainability, as well as their interest in earning …

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Self-Performing Developers And General Contractors Working Together, Christian A. Blevins Jun 2022

Self-Performing Developers And General Contractors Working Together, Christian A. Blevins

Construction Management

One of the major goals for a general contractor during construction is to make a profit and for the owner, get the project built for the lowest amount possible. Just as general contractors have been opening self-performing divisions within their own company, owners are capable of self-performing certain aspects of a construction job as well. Owners have shown the capability to operate the project management aspect of construction in order to keep control of factors that are important to the owner and then form a joint venture or subcontract the entire construction management aspect of the project. The project management …

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Performance Analyses Of Conventional Hot Mix Asphalt With Waste Additives, Muhammad Naveed, Muhammad Azeem Raza, Raza Mehmood Jun 2022

Performance Analyses Of Conventional Hot Mix Asphalt With Waste Additives, Muhammad Naveed, Muhammad Azeem Raza, Raza Mehmood

Mining Engineering Faculty Research & Creative Works

The continuous increase in traffic volume demands performance enhancement of pavements. Common techniques for this performance improvement utilize modifications in the conventional hot mixture asphalt (HMA) through additives. Utilization of urban waste materials as additives for HMA provides opportunity for effective utilization and disposal of these unwanted materials. In this research, two waste materials, low-density polyethylene (LDPE) and crumb rubber (CR), are tested as additives to HMA for performance enhancement, optimization, and cost effectiveness. Performance evaluations are made through comparing stiffness modulus. Stiffness moduli of conventional and waste-material-modified HMA mixtures are evaluated through creep testing. Further, the effect of asphalt …

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Construction Of Concrete Modular Foundations - Procurement And Quality Control, Jackson M. Runyan Jun 2022

Construction Of Concrete Modular Foundations - Procurement And Quality Control, Jackson M. Runyan

Construction Management

This project details the material procurement and quality control processes throughout the construction of two concrete modular foundations. The project focused on constructing the blocks as they were designed to ensure they meet strength parameters to be used in the High Bay Lab at California Polytechnic State University in San Luis Obispo (Cal Poly) for various testing performed as part of the curriculum for the Architectural Engineering (ARCE) and Construction Management (CM) departments. The complex designs, encompassing one-hundred coupler attachments and a dense rebar cage, required extensive attention and hours of labor and quality control review. This paper will cover …

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Landscape Storage Shed For Transitions-Mental Health Association, Jennifer Casey Knickerbocker Jun 2022

Landscape Storage Shed For Transitions-Mental Health Association, Jennifer Casey Knickerbocker

Construction Management

The purpose of this paper is to outline the process of planning, designing, and constructing a storage shed for the non-profit organization, Transitions-Mental Health Association (T-MHA). This project was developed through a Cal Poly Construction Management course, CM 420, Service and Experiential Learning. The goal of this class is to gain experience through physical construction by building a service project for an organization or person who needs it. For this project, T-MHA asked that a storage chest be built for their landscaper who maintains the on-site garden. Due to multiple change orders by the owner, what was originally going to …

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San Luis Obispo Botanical Garden Children's Learning Center Deck - The Preconstruction, Dakota Reynolds Jun 2022

San Luis Obispo Botanical Garden Children's Learning Center Deck - The Preconstruction, Dakota Reynolds

Construction Management

This project team consisted of three construction management majors and one architectural engineering student. The goal of this project was to build a deck at the San Luis Obispo Botanical Garden, but due to setbacks in design, permitting, and communication with the owner, the group was unable to achieve this goal. The goal then shifted, and this group focused on delivering a preconstruction package that would be given to new students to build the deck. In addition, the architectural engineer will still be a part of this new group to make sure the project runs smoothly. This pre-construction package includes …

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Firstfruits Farm Tractor Shed, Gerardo Martinez, Kiana Dehpanah Jun 2022

Firstfruits Farm Tractor Shed, Gerardo Martinez, Kiana Dehpanah

Construction Management

Preconstruction lays the foundation for the overall outcome of a construction project. This project phase includes a detailed schedule, outlines the scope of work, and provides an overall estimate for the project. Devoting a sufficient amount of time and effort into the preconstruction phase is crucial. Preconstruction is an important component of what makes the entirety of a construction project successful. Preconstruction work also includes finding funders to cover the costs of material. Preconstruction and the construction for a tractor shed were completed for FirstFruits Farm in San Luis Obispo. The construction portion of this project relied on the successful …

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Refining The Construction Communication Cal Poly Technical Elective Course, Anna Dissman Jun 2022

Refining The Construction Communication Cal Poly Technical Elective Course, Anna Dissman

Construction Management

Communication is one of the most necessary parts in what makes a project successful in the construction industry. Normally, successful communication skills are developed through experience over time in this industry. When looking into the Construction Management (CM) program at California Polytechnic State University of San Luis Obispo (Cal Poly), a lack of direct focus on multiple key communication skills is present. Furthermore, a new CM communication technical elective should be taught to focus and reinforce the communication skills needed for careers of future students post graduation. By crafting and distributing a well-thought out survey, new knowledge from the perspectives …

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Cvaf: Service Dog Kennel Construction, Spencer G. Allen Jun 2022

Cvaf: Service Dog Kennel Construction, Spencer G. Allen

Construction Management

The California Veterans Assistance Foundation Service Dog Kennel Construction gave back to our country’s veterans by constructing new kennels for their service dogs. The previous kennel on the veteran residential site needed an upgrade due to the increased number of service dogs at the shelter. A team of two Cal Poly Construction Management students consisting of Spencer Allen and Luke Terrio worked to design, estimate, coordinate, and construct a new kennel structure for the site. The roles were divided on the project between the preconstruction and construction phases. During preconstruction Spencer’s role was to schedule the job and create the …

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Girls Build Summer Academy Leadership Summit, Itzell Ruiz Jun 2022

Girls Build Summer Academy Leadership Summit, Itzell Ruiz

Construction Management

This paper highlights the activities and presentations that will take place during the women in construction leadership summit prior to the Girls Build Summer Academy for high school girls. The leadership summit is a two-day event that will consist of presentations on important leadership and construction topics. The presentations will cover topics such as confidence, safety, leadership assessment activity, tool shop training, emerging trends, career paths, jobsite visit, and a women’s panel. This leadership summit will be implemented in the summer of 2023 and will take place at Cal Poly’s campus in the Construction Innovations Center. The scope of this …

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Expanding On Leadership And Professional Skills For A Girls Build Summer Academy, Claire M. Gress Jun 2022

Expanding On Leadership And Professional Skills For A Girls Build Summer Academy, Claire M. Gress

Construction Management

The construction industry has historically been male-dominated. Despite efforts by organizations and companies to encourage women to join the industry, there has been little progress in encouraging more women to enter the industry and getting them to stay. The construction management program at California Polytechnic State University in San Luis Obispo is developing and hosting a Girls Build Summer Academy to familiarize and encourage high school girls to explore construction as a career path. One segment of this boot camp includes leadership modules that will give the girls confidence and the skills they need to be successful leaders in construction. …

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Design And Preconstruction Services For The Construction Of A Visitor Deck At City Farm Slo, Lane Lagomarsino Jun 2022

Design And Preconstruction Services For The Construction Of A Visitor Deck At City Farm Slo, Lane Lagomarsino

Construction Management

This paper will outline the process of designing and planning the construction of a visitor deck at City Farm of San Luis Obispo, which is a local non-profit. The deck was built for the purpose of providing an area for visitors to observe the agricultural land where City Farm educates the community on ecology, nutrition, and sustainable farming. The construction of the deck was completed by three fourth-year Construction Management majors: Lane Lagomarsino, Eric Cederstrom, and Brett Jones. Each project team member was responsible for their own aspect of the project planning and all members collaborated throughout the entire building …

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Single-Pass Inline Pipeline 3d Reconstruction Using Depth Camera Array, Zhexiong Shang, Zhigang Shen Jun 2022

Single-Pass Inline Pipeline 3d Reconstruction Using Depth Camera Array, Zhexiong Shang, Zhigang Shen

Department of Construction Engineering and Management: Faculty Publications

A novel inline inspection (ILI) approach using depth cameras array (DCA) is introduced to create high-fidelity, dense 3D pipeline models. A new camera calibration method is introduced to register the color and the depth information of the cameras into a unified pipe model. By incorporating the calibration outcomes into a robust camera motion estimation approach, dense and complete 3D pipe surface reconstruction is achieved by using only the inline image data collected by a self-powered ILI rover in a single pass through a straight pipeline. The outcomes of the laboratory experiments demonstrate one-millimeter geometrical accuracy and 0.1-pixel photometric accuracy. …

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Physical Plugging Of Lost Circulation Fractures At Microscopic Level, Chengyuan Xu, Honglin Zhang, Yili Kang, Jingyi Zhang, Yingrui Bai, Juan Zhang, Zhenjiang You Jun 2022

Physical Plugging Of Lost Circulation Fractures At Microscopic Level, Chengyuan Xu, Honglin Zhang, Yili Kang, Jingyi Zhang, Yingrui Bai, Juan Zhang, Zhenjiang You

Research outputs 2022 to 2026

Drilling fluid loss into formation fractures is one of the most common and costly problems encountered during the exploration and development of oil and gas resources. At present, the most extensive solution is to use physical lost circulation materials (LCMs) to form high-strength plugging zone in fractures. However, it is still unclear how the plugging is initiated and formed in the fracture. In this paper, a microscopic visualization experimental device for the formation of plugging zone is used to observe the dynamic plugging performance of spherical materials, flaky materials and fibers in fracture. Experimental results show that the formation of …

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Effects Of Wettability, Lithology, And Permeability On The Optimum Slug Size Of Low Salinity Water Flooding In Carbonates: An Experimental Approach, Hala Khaled Hasan Alshadafan Jun 2022

Effects Of Wettability, Lithology, And Permeability On The Optimum Slug Size Of Low Salinity Water Flooding In Carbonates: An Experimental Approach, Hala Khaled Hasan Alshadafan

Theses

Low salinity water flooding has attracted academic and industry communities due to its relatively simple and applicable technology. One of the drawbacks of applying the IOR/EOR technique is the lack of the availability of low salinity water in large quantities at the reasonable cost required for a technically and environmentally successful project. To overcome this problem, the industry proposed to use produced water/sea water after dilution, and reverse osmosis filter technology to achieve the required salinity. Both techniques are quite costly and might hinder the project's economic success. Low salinity water as slug size followed by high salinity water was …

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Fabrication And Characterization Of Graphene Oxide-Based High-Density Polyethylene / Polypropylene Nanocomposites For Biomedical Applications, Albaina Ali Aldhaheri Jun 2022

Fabrication And Characterization Of Graphene Oxide-Based High-Density Polyethylene / Polypropylene Nanocomposites For Biomedical Applications, Albaina Ali Aldhaheri

Theses

Polymeric nanocomposites have recently become one of the most essential sought-after materials for biomedical applications. Among many others, High-Density Polyethylene (HDPE) is being widely used as a bearing material for the artificial hip and knee joints. However, the weak surface properties of HDPE limit the total artificial hip joints’ survival chances. The addition of polypropylene (PP) improves the surface properties of HDPE composites along with their thermal, chemical, and mechanical properties which are crucial in biomedical applications. Moreover, PP can be easily blended with polyethylene (PE) as it has an almost similar chemical resistance to PE. However, PP is more …

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Monitoring Of Renewable Energy Systems By Iot-Aided Scada System, Ohirul Qays, Musse M. Ahmed, M. A. Parvez Mahmud, Ahmed Abu-Siada, S. M. Muyeen, Liton Hossain, Farhana Yasmin, Momtazur Rahman Jun 2022

Monitoring Of Renewable Energy Systems By Iot-Aided Scada System, Ohirul Qays, Musse M. Ahmed, M. A. Parvez Mahmud, Ahmed Abu-Siada, S. M. Muyeen, Liton Hossain, Farhana Yasmin, Momtazur Rahman

Research outputs 2022 to 2026

With the rapid increase of renewable energy generation worldwide, real-time information has become essential to manage such assets, especially for systems installed offshore and in remote areas. To date, there is no cost-effective condition monitoring technique that can assess the state of renewable energy sources in real-time and provide suitable asset management decisions to optimize the utilization of such valuable assets and avoid any full or partial blackout due to unexpected faults. Based on the Internet of Things scheme, this paper represents a new application for the Supervisory Control and Data Acquisition (SCADA) system to monitor a hybrid system comprising …

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Static Testing Of Hybrid Rocket Engine Using Biomass Waste, Saleh Mohammed Musaed Badi Jun 2022

Static Testing Of Hybrid Rocket Engine Using Biomass Waste, Saleh Mohammed Musaed Badi

Theses

This work investigates experimentally for the first time the performance of two solid biomass wastes as propellants for a Hybrid Rocket Motor based on the combustion and propulsion parameters such as combustion chamber pressure, thrust force, chamber temperature, combustion characteristics, and flame length generated. The main objective of this study is to examine the performance of the proposed biomass fuels (Date stone powder and Jojoba waste powder) in comparison with typical hydrocarbon fuels. To make an accurate comparison, Paraffin Wax-based propellant was used in this study as a reference fuel to compare with biomass performance using the same testing facility …

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Effect Of Biochar On Desiccation Of Marine Soils Under Constant And Cyclic Temperatures, Thellen Kumar Puspanathan, Vihan Shenal Jayawardane, Suvash Chandra Paul, Kong Sih Ying, Sanjay Kumar Shukla, Vivi Anggraini Jun 2022

Effect Of Biochar On Desiccation Of Marine Soils Under Constant And Cyclic Temperatures, Thellen Kumar Puspanathan, Vihan Shenal Jayawardane, Suvash Chandra Paul, Kong Sih Ying, Sanjay Kumar Shukla, Vivi Anggraini

Research outputs 2022 to 2026

Biochar has recently been gaining increasing attention as a stable and sustainable soil amendment material. However, the effect of biochar amendment on the desiccation behaviour of coastal soils has not yet been examined. Consequently, the present study primarily investigated the effect of exposing biochar-amended marine soil (BAS) to constant and cyclic temperatures on its swell–shrink, evaporation and desiccation cracking characteristics. Biochar contents of 1%, 2%, 4% and particle size ranges of PS-1 (600 μm < D ≤ 2000 μm), PS-2 (300 μm < D ≤ 600 μm), PS-3 (D ≤ 75 μm) (D: biochar particle diameter) were employed. It was revealed that the absolute volumetric shrinkage of both unamended and biochar-amended specimens increased as the number of thermal cycles increased. Under continuous heat exposure, 4% (PS-3) BAS in compacted state achieved the maximum reduction in volumetric shrinkage which was 42%. Moreover, under continuous heat exposure, 2% (PS-1) BAS in slurry state achieved the highest reduction in desiccation cracking, which was 73%. The present study highlights the importance of identifying the most effective combination of biochar content and particle size required to achieve a desired outcome, in order to gain the maximum benefit of biochar as an amendment material at the lowest possible cost.

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Consensus Formation On Heterogeneous Networks, Edoardo Fadda, Junda He, Claudia J. Tessone, Paolo Barucca Jun 2022

Consensus Formation On Heterogeneous Networks, Edoardo Fadda, Junda He, Claudia J. Tessone, Paolo Barucca

Research Collection School Of Computing and Information Systems

Reaching consensus-a macroscopic state where the system constituents display the same microscopic state-is a necessity in multiple complex socio-technical and techno-economic systems: their correct functioning ultimately depends on it. In many distributed systems-of which blockchain-based applications are a paradigmatic example-the process of consensus formation is crucial not only for the emergence of a leading majority but for the very functioning of the system. We build a minimalistic network model of consensus formation on blockchain systems for quantifying how central nodes-with respect to their average distance to others-can leverage on their position to obtain competitive advantage in the consensus process. We …

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Who Is Missing? Characterizing The Participation Of Different Demographic Groups In A Korean Nationwide Daily Conversation Corpus, Haewoon Kwak, Jisun An, Kunwoo Park Jun 2022

Who Is Missing? Characterizing The Participation Of Different Demographic Groups In A Korean Nationwide Daily Conversation Corpus, Haewoon Kwak, Jisun An, Kunwoo Park

Research Collection School Of Computing and Information Systems

A conversation corpus is essential to build interactive AI applications. However, the demographic information of the participants in such corpora is largely underexplored mainly due to the lack of individual data in many corpora. In this work, we analyze a Korean nationwide daily conversation corpus constructed by the National Institute of Korean Language (NIKL) to characterize the participation of different demographic (age and sex) groups in the corpus.

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Freed: An Efficient Privacy-Preserving Solution For Person Re-Identification, Bowen Zhao, Yingjiu Li, Ximeng Liu, Hwee Hwa Pang, Robert H. Deng Jun 2022

Freed: An Efficient Privacy-Preserving Solution For Person Re-Identification, Bowen Zhao, Yingjiu Li, Ximeng Liu, Hwee Hwa Pang, Robert H. Deng

Research Collection School Of Computing and Information Systems

Person Re-IDentification (Re-ID) is a critical technology to identify a target person from captured person images by surveillance cameras. However, person Re-ID has triggered great concerns of personal image privacy. Although the law (e.g., GDPR) has stipulated person images are personal private data, there is no an efficient solution to tackle the image privacy concern for person Re-ID. To this end, we propose FREED, the first system solution for privacy-preserving person Re-ID, which supports the state-of-the-art person Re-ID operations on encrypted feature vectors of person images. To handle the encryption of feature vectors effectively and enable person Re-ID operations on …

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Officers: Operational Framework For Intelligent Crime-And-Emergency Response Scheduling, Jonathan David Chase, Siong Thye Goh, Tran Phong, Hoong Chuin Lau Jun 2022

Officers: Operational Framework For Intelligent Crime-And-Emergency Response Scheduling, Jonathan David Chase, Siong Thye Goh, Tran Phong, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

In the quest to achieve better response times in dense urban environments, law enforcement agencies are seeking AI-driven planning systems to inform their patrol strategies. In this paper, we present a framework, OFFICERS, for deployment planning that learns from historical data to generate deployment schedules on a daily basis. We accurately predict incidents using ST-ResNet, a deep learning technique that captures wide-ranging spatio-temporal dependencies, and solve a large-scale optimization problem to schedule deployment, significantly improving its scalability through a simulated annealing solver. Methodologically, our approach outperforms our previous works where prediction was done using Generative Adversarial Networks, and optimization was …

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Taxi Travel Time Based Geographically Weighted Regression Model (Gwr) For Modeling Public Housing Prices In Singapore, Yi’An Wang, Fangyi Cai, Shih-Fen Cheng, Bo Wu, Kai Cao Jun 2022

Taxi Travel Time Based Geographically Weighted Regression Model (Gwr) For Modeling Public Housing Prices In Singapore, Yi’An Wang, Fangyi Cai, Shih-Fen Cheng, Bo Wu, Kai Cao

Research Collection School Of Computing and Information Systems

In this research, a taxi travel time based Geographically Weighted Regression model (GWR) is proposed and utilized to model the public housing price in the case study of Singapore. In addition, a comparison between the proposed taxi data driven GWR and other models, such as ordinary least squares model (OLS), GWR model based on Euclidean distance and GWR model based on public transport travel time, have also been carried out. Results indicates that taxi travel time based GWR model has better fitting performance than the OLS model, and slightly better than the Euclidean distance-based GWR model, however, it is not …

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Aerodynamics And Aeroacoustics Optimization Of Vehicle’S Side Mirror Base And Exhaust Pipe, Moath Nayef Mohamed Zaareer Jun 2022

Aerodynamics And Aeroacoustics Optimization Of Vehicle’S Side Mirror Base And Exhaust Pipe, Moath Nayef Mohamed Zaareer

Theses

This thesis is concerned with studying two different vehicle parts in terms of aerodynamics and aeroacoustics. Two main factors determine the efficiency and luxury of the vehicle, the low aerodynamic forces and low noise emission. The aerodynamic drag coefficient is concerned with how easy a vehicle can travel through the air; the lower the value, the less fuel is needed to move the vehicle forward and less air resistance the vehicle faces. The aerodynamic lift coefficient is related to vehicle ground stability, and the more negative the value is, the higher the vehicle's stability. Moreover, the aeroacoustics is concerned with …

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Using Metal-Organic Frameworks (Mof) To Reduce The Carbon Footprint Of Concrete, Mona Ibrahim El-Hallak Jun 2022

Using Metal-Organic Frameworks (Mof) To Reduce The Carbon Footprint Of Concrete, Mona Ibrahim El-Hallak

Theses

The production of concrete by the construction industry has a massive impact on the environment. The process of manufacturing its main component, cement, releases a considerable amount of anthropogenic carbon dioxide. This thesis is concerned with the production of sustainable and eco-friendly concrete that integrates metal-organic frameworks (MOF) to capture and offset the CO2 emissions emitted during the production of cement. The main objective is to synthesize a MOF capable of capturing CO2 in concrete through accelerated carbonation curing and to assess its impact on concrete performance. Different parameters were examined, including the MOF content, initial curing duration, …

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Numerical Modelling Of Externally-Bonded Fiber Reinforced Polymer Shear-Strengthened Reinforced Concrete Beams Subjected To Fatigue Loading, Nagwa Ibrahim Fares Jun 2022

Numerical Modelling Of Externally-Bonded Fiber Reinforced Polymer Shear-Strengthened Reinforced Concrete Beams Subjected To Fatigue Loading, Nagwa Ibrahim Fares

Theses

An extensive number of existing structures persistently exposed to fatigue loading such as bridges, offshore structures, pavements, and highways, are in urgent need of repairing and strengthening. This may be attributed to the continuous increase in the load requirements, change of the structure’s function, and meeting current load standards. Among the potential methods of rehabilitation and strengthening of existing reinforced concrete structures, the externally bonding fiber reinforced polymers (FRP) composites are gaining massive popularity and becoming a viable and cost-effective method. Shear failure of reinforced concrete (RC) beams is known to be brittle, which occurs without prior sufficient warnings; therefore, …

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Human Detection From Aerial Imagery For Search And Rescue Operations, Namat Ahmad Bachir Jun 2022

Human Detection From Aerial Imagery For Search And Rescue Operations, Namat Ahmad Bachir

Theses

Mountain recreation is becoming more popular with mountaineering, rock climbing, skiing, mountain biking, hiking, and mushroom picking among the most popular sports. Despite this tendency, there is currently limited research available explaining the rise in search and rescue (SAR), as well as the injuries and illnesses that entail SAR aid in tourist-friendly mountain and desert areas. The objective of a search and rescue operation is to scan the farthest area feasible in the shortest amount of time in order to locate a lost or wounded individual. In the past decade, several new and spectacular uses for drones, including search and …

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Deep Learning Based Segmentation And Classification For Improved Breast Cancer Detection, Bita Khosrow Asadi Khosrow Asadi Jun 2022

Deep Learning Based Segmentation And Classification For Improved Breast Cancer Detection, Bita Khosrow Asadi Khosrow Asadi

Theses

Breast Cancer is a leading killer of women globally. It is a serious health concern caused by calcifications or abnormal tissue growth in the breast. Doing a screening and identifying the nature of the tumor as benign or malignant is important to facilitate early intervention, which drastically decreases the mortality rate. Usually, it uses ultrasound images, since they are easily accessible to most people and have no drawbacks as such, unlike in the other most famous screening technique of mammograms where in some cases you may not get a clear scan. In this thesis, the approach to this problem is …

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Thermal Stress Mitigation Of Single-Phase Sinewave Inverter By Using Double Switch H Bridge Configuration, Mohammad Mousa Ahmad Hushki Jun 2022

Thermal Stress Mitigation Of Single-Phase Sinewave Inverter By Using Double Switch H Bridge Configuration, Mohammad Mousa Ahmad Hushki

Theses

The increasing demand for renewable energies and the ongoing advancement in the industry require continuously evolving power converters in terms of efficiency, power density, and reliability. Furthermore, power converters’ applications in harsh and remote environments such as offshore wind turbines demand robust and reliable designs to help reduce operational costs. Power switch failure is a critical reliability issue that leads to the converter going out of service, causing an unscheduled maintenance event. The main reason behind power switch failure is thermal cycling. Therefore, the first part of this thesis attempts to develop an effective double switch H bridge inverter topology …

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