Kim, Taehoon; Kim, Yong-Woo; Cho, Hunhee. (2020). Dynamic Production Scheduling Model Under Due Date Uncertainty in Precast Concrete Construction. Journal Of Cleaner Production, 257.
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Abstract
Precast concrete structures (PCs) are widely used in the construction industry to reduce project delivery times and improve quality. On-time delivery of PCs is critical for successful project completion because the processes involving precast concrete are the critical paths in most cases. However, existing models for scheduling PC production are not adequate for use in dynamic environments where construction projects have uncertain construction schedules because of various reasons such as poor labor productivity, inadequate equipment, and poor weather. This research proposes a dynamic model for PC production scheduling by adopting a discrete-time simulation method to respond to due date changes in real time and by using a new dispatching rule that considers the uncertainty of the due dates to minimize tardiness. The model is validated by simulation experiments based on various scenarios with different levels of tightness and due date uncertainty. The results of this research will contribute to construction project productivity with a reliable and economic precast concrete supply chain. (C) 2020 Elsevier Ltd. All rights reserved.
Keywords
Multiple Production; Demand Variability; Supply Chain; Shop; Management; Minimize; Lines; Precast Concrete Production; Dynamic Simulation; Uncertainty; Production Scheduling; Dispatching Rule
Soltaninejad, Mostafa; Fardhosseini, Mohammad Sadra; Kim, Yong Woo. (2021). Safety Climate and Productivity Improvement of Construction Workplaces Through the 6S System: Mixed-Method Analysis of 5S and Safety Integration. International Journal Of Occupational Safety & Ergonomics, 28(3), 1811-1821.
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Abstract
The purpose of this study is to develop a framework for integrating essential safety practices (visualization, job safety analysis and plan-do-check-act) into 5S steps and validate it. First, 18 interviews with a snowball sample of construction workers, safety representatives, supervisors and site and project managers were conducted. A grounded theory method was utilized to code the interview data. The results revealed that the studied construction companies implement a systematic safety-based methodology to minimize construction work injuries. Second, to validate the proposed framework, a pre-test and post-test study was applied. The case and control groups (26 participants) answered a 6S questionnaire before the 6S system and 1 month after implementation. The results revealed that safety climate and productivity significantly increased for the case group but reduced for the control group during time.
Keywords
5s Method; 6s System; Grounded Theory; Lean Construction; Productivity; Safety Climate; Health; Management; Leadership; Culture; Impact
Launching the Inspire Fund: An early step for CBE’s Office of Research “For a small college, CBE has a broad range of research paradigms, from history and arts, to social science and engineering.” — Carrie Sturts Dossick, Associate Dean of Research Upon taking on the role of Associate Dean of Research, Carrie Sturts Dossick, professor in the Department of Construction Management, undertook listening sessions to learn about the research needs of faculty, staff and students across the College of Built…
In 2021 the College of Built Environments launched the CBE Inspire Fund, designed to support CBE research activities for which a relatively small amount of support can be transformative. The second year of awards have just been announced, supporting five projects across 4 departments within the college as they address topics such as food sovereignty, anti-displacement, affordable housing, and health & wellbeing. This year’s awardees include: Defining the New Diaspora: Where Seattle’s Black Church Congregants Are Moving and Why Rachel…
Assistant Professor, Department of Construction Management
Fred is an Assistant Professor with the Department of Construction Management (CM) at the University of Washington (UW). Prior to joining UW in September 2021, he was an Assistant Professor at Texas State University in San Marcos, TX where he taught and performed research in the areas of concrete materials, durability, and sustainable infrastructure construction. He received his PhD in Civil Engineering from the University of Texas at Austin in 2016.
Dr. Aguayo is interested in research application that contribute to facilitating the implementation of sustainable and novel cement-based systems in infrastructure and building applications such as alternative cement binders, supplementary cementing materials (SCMs), recycled aggregates, and high performing concretes. His research group focuses on evaluating and characterizing deterioration processes in new and existing cementitious materials, while also developing test methods to predict and enhance their performance and durability in the field. He primarily examines durability-related issues in cement-based materials such as corrosion, carbonation, ASR, sulfate attack, and early-age volume changes.
Dr. Aguayo is a well-established researcher with over 13 years of experience and over $1.2M in funded research projects as either PI or Co-PI since 2016. His work has been supported by both private industry and public agencies including LarfargeHolcim, Texas DOT, Minnesota DOT, New Mexico DOT, National Research Road Alliance (NRRA), and the Portland Cement Association (PCA). He is an active member of the American Concrete Institute and ASTM International, and participates in several committees related to concrete durability (ACI 201) and material science of cementitious systems (ACI 236).
Previous studies on construction hazard prevention have shown that almost 50% of construction fatalities and accidents can be linked to decisions made during the design process. To address the influence of upstream design decisions on worker safety, researchers have developed the Prevention through Design (PtD) concept to proactively eliminate safety hazards in the workplace. In response, CBE researchers, Hyun Woo “Chris” Lee, PD Koon Endowed Associate Professor in Construction Management and Dr. Laura Osburn, Senior Research Scientist in Construction Management,…
Julie Kriegh, researcher with the Carbon Leadership Forum and other CBE research centers, and owner of Kriegh Architecture Studios, collaborated with other CBE faculty and external partners to lead a UW CBE studio course in collaboration with Google that developed and delivered a design proposal for a sustainable data center. CBE collaborators included Hyun Woo “Chris” Lee, P.D. Koon Professorship in Construction Management; Jan Whittington, Associate Professor of the Department of Urban Design and Planning, and Director of the Urban…
This winter quarter the College of Built Environments launched its new CBE Inspire Fund. Designed to support CBE research activities for which a relatively small amount of support can be transformative, in mid-February the college awarded the first 6 grants. Projects supported by the CBE Inspire Fund hail from 4 departments within the college and tackling topics such as food systems, mapping cultural spaces, and energy justice. The CBE Inspire Fund is the first research funding opportunity offered by the…
The SHARE Lab (Safety and Health Advancement through Research and Education) has produced two ergonomics best practice booklets and two training videos on the use of 4-wheel carts in the roofing trade. Housed in the Department of Construction Management, the mission of the SHARE Lab is to promote construction safety and health through evidence-based innovative research, education, and practices. For more information, please contact Contact Dr. Ken-Yu Lin, Associate Professor, if you’d like access to the guide book or the…
The Energy and Sustainability in Construction (ESC) Lab promotes energy efficiency and sustainability (EES) in the built environment through the development of sustainable design, innovative project delivery practices, and risk-based financial models for EES investments. Our work focuses on integrating advanced financial analysis, project development, and management strategies to enhance the delivery of energy-efficient buildings and sustainable infrastructure.
Through innovative solutions, the ESC Lab addresses complex challenges in current project development practices that slow the transition toward a more sustainable society. Our research spans a wide range of critical areas, including commercial energy retrofits, community solar projects, green datacenters, healthy commercial buildings, and electric vehicle (EV) charging infrastructure. By tackling these pressing issues, the ESC Lab is at the forefront of driving transformative changes in the built environment.
Financial and Management Questions that Lead to Sustainable Solutions
The ESC Lab targets to help project stakeholders evaluate the risks and rewards of energy efficiency and sustainability (EES) investments by addressing some of the industry’s most pressing financial and management challenges, including:
- What policies, financing mechanisms, and project delivery systems best support the advancement of EES?
- How can we categorize and accurately model the unique risks associated with EES investments?
- What analytical modeling methods can be applied to ensure the effective implementation of EES measures in projects?
- How can we optimize investment strategies to balance environmental benefits with financial returns?
- What best practices can enhance stakeholder engagement and collaboration to drive successful EES project outcomes?
Pursuing Innovative Solutions to Energy Efficiency and Sustainability
The ESC Lab has developed a series of analytical models and evaluation practices that facilitate the effective delivery of energy-efficient commercial buildings and sustainable infrastructure, including:
- Cost and power demand model for electric vehicle (EV) charging infrastructure
- Conceptual cost and carbon estimating model for mass timber structure
- Energy-Related Risk Management in Integrated Project Delivery
- Phased Investment for Energy Retrofit (PIER)
- Energy Retrofit Loan Analysis Model (ERLAM)
- An optimized portfolio analysis for community-based photovoltaic investment
ESC Research Funders and Selected Projects:
- UW Clean Energy Institute: “Equitable Public Electric Vehicle Charging Infrastructure Expansion—From the Tribal Community Perspective”
- King County Metro–Sound Transit–Seattle City Light: “Electrified Mobility Hubs: A Blueprint for the Future of Transit Infrastructure”
- UW Global Innovation Fund: “Mitigating Effects of Future Pandemics with the Use of Risk-Responsive Building Codes: A Developing Country Framework”
- King County Metro: “Evaluation of a Public/Private Partnership (P3) Model for Bus Base Electrification”
- UW CBE INSPIRE Fund: “Investigating the Health Requirements and Risk-Responsiveness Criteria in Office Building Codes for Mitigating COVID-19 and Future Airborne Diseases”
- UW CBE INSPIRE Fund: “Investigating Energy Justice in Washington State in Terms of Photovoltaic (PV) Systems and Electric Vehicle (EV) Chargers”
- Google: “A Proposal to Grow a Greener Data Center with Google”
- UW Population Health: “Economic Impact of Office Workplace Transformation due to COVID-19: How Can Buildings and Surrounding Areas Recover?”
- UW Transportation: “UW Transportation Electrification and Solar Study”
- RERI–LBNL–DOE: “Effect of Energy Benchmarking and Disclosure on Office Building Marketability”
- Pankow–Skanska–Oregon DEQ: “Life Cycle Assessment (LCA) for Low Carbon Construction Commercial Office Building MEP & Interiors Data”
- BE Innovation: “Impact of Energy Benchmarking and Disclosure on the Performance of Office Buildings”
Selected Journal Publications:
- Min, Y. and Lee, H.W. (2024). “Adoption Inequalities and Causal Relationship between Residential Electric Vehicle Chargers and Heat Pumps.” ASCE Journal of Construction Engineering and Management, 04024025.
- Min, Y. and Lee, H.W. (2024). “Quantifying Clean Energy Justice: Impact of Solarize Programs on Rooftop Solar Disparities in the Pacific Northwest.” Sustainable Cities and Society, 105287.
- Shang, L., Dermisi, S., Choe, Y., Lee, H.W., and Min, Y. (2023). “Assessing the Office Building Marketability Before and After the Implementation of Energy Benchmarking and Disclosure Policies – Lessons Learned from Major US Cities.” Sustainability, 15(11), 8883.
- Min, Y. and Lee, H.W. (2023). “Characterization of Vulnerable Communities in Terms of the Benefits and Burdens of the Energy Transition in Pacific Northwest Cities.” Journal of Cleaner Production, 135949.
- Min, Y., Lee, H.W., and Hurvitz, P.M. (2023). “Clean Energy Justice: Different Adoption Characteristics of Underserved Communities in Rooftop Solar and Electric Vehicle Chargers in Seattle.” Energy Research and Social Science, 96(1), 102931.
- Su, S., Li, X., Zhu, C., Lu, Y., and Lee, H.W. (2021). “Dynamic Life Cycle Assessment: A Review of Research for Temporal Variations in Life Cycle Assessment Studies.” Environmental Engineering Science, 38(11).
- Droguett, B. X. R., Huang, M., Lee, H.W., Simonen, K., and Ditto, J. (2020). “Mechanical, Electrical, Plumbing and Tenant Improvements Over the Building Lifetime: Estimating Material Quantities and Embodied Carbon for Climate Change Mitigation.” Energy and Buildings, 226, 110324.
- Ho, C., Lee, H.W., and Gambatese, J. (2020). “Application of Prevention through Design (PtD) to Improve the Safety of Solar Installations on Small Buildings.” Safety Science, 125, 104633.
- Gomez Cunya, L.A., Fardhosseini, M.S., Lee, H.W., and Choi, K. (2020). “Analyzing Investments in Flood Protection Structures: A Real Options Approach.” International Journal of Disaster Risk Reduction, 43(2), 101377.
- Shang, L., Lee H.W., Dermisi, S., and Choe, Y., (2020). “Impact of Energy Benchmarking and Disclosure Policy on Office Buildings.” Journal of Cleaner Production, 250, 119500.
- Shakouri, M., Lee, H.W., and Kim, Y.-W. (2017). “A Probabilistic Portfolio-based Model for Financial Valuation of Community Solar.” Applied Energy, 191(1), 709-726.
- Shakouri, M. and Lee, H.W. (2016). “Mean-Variance Portfolio Analysis Data for Optimizing Community-based Photovoltaic Investment.” Data in Brief, 6(1), 840-842.\
Current and Former Lab Members:
- Abdul-Razak Alidu
- Byungju Jeon
- Chitika Vasudeva
- Yohan Min
- Matt Wiggins
- Novi T.I. Bramono
- Yong-Hyuk Oh
- Chuou Zhang
- Jonghyeob Kim
- Wenqi Zhu
- Julie Knorr
- Zhila Mohammady