December 4, 2018
CIRI’s Iris Tien, assistant professor in the School of Civil and Environmental Engineering at Georgia Institute of Technology, has been chosen to co-lead a Discovery Area Working Group for the City of Atlanta, through the Rockefeller Foundation 100 Resilient Cities (100RC) program. Cities chosen to participate in 100RC are provided the requisite resources to develop a “roadmap to resilience” along physical, social, and economic axes, according to the group’s website. The City of Atlanta’s particular set of challenges revolves around the impact of inadequate transportation infrastructure on other critical infrastructure sectors, as they are interdependent on each other.
Tien’s interdisciplinary background and prior work with CIRI have equipped her to co-lead the 100RC working group, which aims to “strengthen and maintain infrastructure and promote community preparedness.” Tien’s expertise includes analysis of water distribution systems and their connections with read more…
Applegate, C., and Tien, I., “Framework for Probabilistic Vulnerability Analysis of Interdependent Infrastructure Systems,” ASCE Journal of Computing in Civil Engineering, Vol. 33, No. 1, January 2019
Abstract — Critical infrastructure systems are deteriorating and experiencing increased cascading failures. In this paper, we propose a new probabilistic framework read more…
October 30, 2018
The School of Civil and Environmental Engineering’s Iris Tien has just returned from two days of meetings and idea-sharing with some of the nation’s most promising young engineers.
Organized by the National Academy of Engineering, the Frontiers of Engineering symposium gathers what the academy calls “exceptional” engineers from 30 to 45 years old to facilitate “cross-disciplinary exchange and promote the transfer of new techniques and approaches across fields in order to sustain and build U.S. innovative capacity.”
This year’s US Frontiers of Engineering was hosted by MIT Lincoln Laboratory in Lexington, Massachusetts. About 100 outstanding early career engineers met for an intensive 2-1/2 day symposium to discuss cutting-edge developments in four areas: Quantum Computers, the Role of Engineering in the Face of Conflict and Disaster, Resilient and Reliable Infrastructure, and Theranostics.
It’s a highly competitive and prestigious invitation extended to fewer than 100 people this year, according to the academy. It’s also the second consecutive year Tien has participated in the meeting; for 2018, she helped organize the session on resilient and reliable infrastructure. Invited participants for 2018 included three other early career professors from Georgia Tech, as well as rising stars from companies like Medtronic, Microsoft and General Motors.
This is the second Frontiers symposium Tien has attended this year; she attended the Japan-America Frontiers of Engineering earlier this summer.
Probabilistic Framework for Integrating Multiple Data Sources to Estimate Disaster and Failure Events and Increase Situational Awareness
Lee, C., and Tien, I., “Probabilistic Framework for Integrating Multiple Data Sources to Estimate Disaster and Failure Events and Increase Situational Awareness,” ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Vol. 4, No. 4, December 2018
Abstract — As data for monitoring the natural and built environments become increasingly prevalent, integrating information from varied data sources offers a fuller read more…
Smith, S., Kurtis, K., and Tien, I., “Probabilistic Evaluation of Concrete Freeze-Thaw Design Guidance,” Materials and Structures, Vol. 51, No. 5, pp. 124-137, October 2018
Abstract — A novel limit-state function using Powers’ models is developed to assess current freeze-thaw exposure categories and design criteria for concrete placements read more…
September 4, 2018
Two Georgia Tech researchers have won the first-place paper award in infrastructure at Resilience Week 2018 for their work using a variety of data sources to better understand and design infrastructure systems.
It’s the second consecutive year that Iris Tien and one of her students have won a top paper award at the conference, which focuses on making critical infrastructure — like power, water, transportation — and communities more reliable and secure.
The paper by Cynthia Lee and Tien detailed work using data from sensors, crowd-sourcing and other sources to improve what Tien called “situational awareness” for these critical systems.
“The paper showed how different sources of data help us understand these systems better, and how we might design systems with different characteristics that are more resilient,” said Tien, an assistant professor in the School of Civil and Environmental Engineering.
“A key to this is also considering interdependencies between multiple systems.”
The Resilience Week symposium would seem an ideal venue for Tien’s work understanding those interdependencies. The annual gathering of researchers and scientists from public agencies, universities and private industry focuses on uncovering the hidden connections of critical systems to more effectively mitigate the impacts from disaster and improve recovery.
June 27, 2018
Iris Tien has just returned from a gathering of a few dozen of the most promising young engineers from the United States and Japan, thanks to an invitation from the National Academy of Engineering.
The 2018 Japan-America Frontiers of Engineering symposium invited 60 early career engineers for two days of intensive conversations about emerging technology in water treatment, bionics and prosthetics, smart structures and materials, and advanced artificial intelligence.
“It was a great opportunity to bridge across the two countries and see how Japanese and American researchers approach common research challenges,” said Tien, an assistant professor in the School of Civil and Environmental Engineering. She said the conversations allowed the group “to explore how different approaches — e.g., machine learning and systems-level analyses — apply across areas of engineering.”
Saini, A., and Tien, I., “Methodology for Real-Time Prediction of Structural Seismic Risk Based on Sensor Measurements,” Structural Safety, Vol. 73, pp. 54-63, July 2018
Abstract — Current earthquake early warning systems utilize p-wave data to predict the extent of an earthquake threat and issue warnings at a regional scale. In the assessment of read more…
Resilient by Design: The Case for Increasing Resilience of Buildings and Their Linked Food-Energy-Water Systems
Tien, I., “Resilient by Design: The Case for Increasing Resilience of Buildings and Their Linked Food-Energy-Water Systems,” Elementa: Science of the Anthropocene, Vol. 6, No. 18, pp. 1-12, 2018
Abstract — The resilience of buildings and food, energy, and water systems (FEWS) to natural or manmade disruptions are closely linked. The resilience of a building goes beyond the safety of its structural read more…
February 21, 2018
Ph.D. student Ajay Saini has earned the support of the American Society of Civil Engineers for his work on structural reliability and resilience.
The society selected Saini for its O.H. Ammann Research Fellowship in Structural Engineering this year. He said he’ll use the funding to finish his doctoral research with Assistant Professor Iris Tien building a model that optimizes structural reliability in the short and long term, accounting for seismic risks, degradation over time, and the effects of climate change.
“It is great to be recognized by ASCE, and it definitely will help with my professional career,” Saini said. “It is also added responsibility and motivation and a great recognition of the research we are all doing here as a research group at Tech.”
Saini said he became interested in mitigating earthquake risks for structures as an undergraduate, but it wasn’t until he took a class from Tien that he became interested in broader risk assessments. read more…
By John Donovan | December 19, 2017
When the lights went out at Hartsfield-Jackson Atlanta International Airport on Sunday, Dec. 20, 2017, darkness fell quickly over the world of commercial aviation.
Location, Location, Location
“I think that [problem] was kind of highlighted in this instance. [Backup systems] often are located in the same spot,” says Iris Tien, a professor at Georgia Tech who earned her doctorate in civil systems engineering from the University of California, Berkeley. “This just showed this might not be the best design system.” read more…
By Ross Terrell, Tasnim Shamma | December 18, 2017
The blackout at Hartsfield-Jackson Atlanta International Airport on Sunday may have cost more than peace of mind.
Iris Tien, an engineering professor at Georgia Tech, said Georgia Power and airport officials should look at ways to make sure the power units are more equipped to handle an emergency like this.
“Something that comes out of this event and other events we’ve seen is that you need to have not only these functionally separated but these geographically separated back-up as well,” Tien said.
Tien said designing a power grid to withstand a fire looks different than building one to handle a natural disaster like a hurricane.
Georgia Power officials said the investigation into what happened could last through the end of the week. Officials say it will be a lengthy process before the main system is fully repaired.
By David Wickert and J. Scott Trubey | December 18, 2017
The fire that shut down power at Hartsfield-Jackson International Airport was a wake-up call for airports across the country, experts say. Though the airport and Georgia Power are still investigating the cause, aviation experts questioned why the parts of the backup electrical system serving the airport were located so close to the main power system – close enough that both were disabled by a single fire.
“In the 40 years or so the airport has been here, we’ve never had anything like this happen,” airport communications director Reese McCranie said.
Iris Tien, an assistant professor of civil engineering at Georgia Tech, has studied redundant electrical and other systems. She said there needs to be a balance between keeping backup systems close enough to make repairs easy and far enough away to make sure they can’t be compromised along with the main system.
Cost is also a factor.
“You have to be redundant while still being financially feasible,” Tien said.
“The redundant systems we put in place we believe would have covered a power outage,” McCranie said. “Because of yesterday’s power outage, we’re reviewing that very closely. We’re looking at possible remedies.”
Semesters Taught: Fall 2017
Class Size: 30
This course provides in-depth knowledge and application of methods and techniques to use data for the monitoring, assessment, and control of civil and environmental engineering (CEE) systems. The course is divided into three main modules: (1) data collection and monitoring, (2) analytics and learning, and (3) prediction and control. Topics include: (1): sampling, control variables, optimal sensor placement, and value of information; (2): data filtering, regression, classification, and machine learning; and (3): prediction algorithms, control methods, human behavior change, and public policy considerations. The course format combines theoretical foundations and hands-on application of concepts.
Tien, Johansen win Resilience Week top award for paper on vulnerabilities of interdependent infrastructure
October 19, 2017
Iris Tien and Ph.D. student Chloe Johansen won a top award at the Resilience Week 2017 conference for their paper on analyzing the vulnerabilities of interdependent infrastructure.
Using Atlanta’s water and power systems as a case study, Tien and Johansen presented their probabilistic approach to modeling interactions between infrastructure systems including how to identify critical components and weak spots. Their paper won the first-place award in the resilient critical infrastructure category at the conference in September.
“The paper is related to the work I am doing in modeling interdependent critical infrastructure systems. It specifically looks at the City of Atlanta systems where we are able to do some unique validation with real events,” said Tien, an assistant professor in the School of Civil and Environmental Engineering. read more…
Funding Agency: US Department of Transportation (USDOT) #00055082-02B
Probabilistic Multi-Scale Modeling of Interdependencies between Critical Infrastructure Systems for Resilience
Johansen, C., and Tien, I., “Probabilistic Multi-Scale Modeling of Interdependencies between Critical Infrastructure Systems for Resilience,” Sustainable and Resilient Infrastructure, Vol. 3, No. 1, pp. 1-15, 2018
Abstract — The prevalence of aging infrastructure and an increase in cascading failures have highlighted the need to focus on building strong, interdependent infrastructure read more…
Tien, I., and Der Kiureghian, A., “Reliability Assessment of Critical Infrastructure Using Bayesian Networks,” ASCE Journal of Infrastructure Systems, Vol. 23, No. 4, December 2017
Abstract — The authors present a Bayesian network (BN)-based approach for modeling and reliability assessment of infrastructure systems. The BN is a powerful framework read more…
June 23, 2017
The School of Civil and Environmental Engineering’s Iris Tien will travel to Connecticut this fall for two days of meetings and idea-sharing with some of the nation’s most promising young engineers.
Organized by the National Academy of Engineering, the Frontiers of Engineering symposium gathers what the academy calls “exceptional” engineers from 30 to 45 years old to facilitate “cross-disciplinary exchange and promote the transfer of new techniques and approaches across fields in order to sustain and build U.S. innovative capacity.”
It’s a highly competitive and prestigious invitation extended to only 82 people this year, according to an academy news release.
“My research is highly interdisciplinary, and at the symposium, I am looking forward to connecting with colleagues across engineering,” said Tien, an assistant professor in the School.
Algorithms for Bayesian Network Modeling, Inference, and Reliability Assessment for Multistate Flow Networks
Tong, Y., and Tien, I., “Algorithms for Bayesian Network Modeling, Inference, and Reliability Assessment for Multistate Flow Networks,” ASCE Journal of Computing in Civil Engineering, Vol. 31, No. 5, September 2017
Abstract — The Bayesian network (BN) is a useful tool for the modeling and reliability assessment of civil infrastructure systems. For a system comprising many read more…
May 24, 2017
By Fenly Foxen
Wednesday on “Closer Look with Rose Scott and Jim Burress:”
18:01: Dr. Iris Tien, an assistant professor at Georgia Tech’s School of Civil and Environmental Engineering, tells us what lessons can be learned after the reconstruction of the collapsed Interstate 85 bridge
Tien (center) with Jim Burress (left) and Rose Scott (right) after Tien’s interview on Atlanta’s infrastructure on the WABE program “Closer Look with Rose Scott and Jim Burress.” WABE is Atlanta’s NPR station.
Framework for Probabilistic Assessment of Maximum Nonlinear Structural Response Based on Sensor Measurements: Discretization and Estimation
Saini, A., and Tien, I., “Framework for Probabilistic Assessment of Maximum Nonlinear Structural Response Based on Sensor Measurements: Discretization and Estimation,” ASCE Journal of Engineering Mechanics, Vol. 143, No. 9, September 2017
Abstract — A probabilistic framework to draw real-time inferences on the maximum response of an uncertain nonlinear structural system under stochastic excitation based on read more…
Saini, A., and Tien, I., “Impacts of Climate Change on the Assessment of Long-Term Structural Reliability,” ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Vol. 3, No. 3, September 2017
Abstract — Global climate change has triggered studies across various science and engineering fields. This study demonstrates the need to account for climate change in assessing read more…
Mapping Infrastructure Interdependencies for Improved Emergency Management and Resilience Investment Decisions
Funding Agency: Department of Homeland Security (DHS) Award #2015ST061-CIRC01
Funding Agency: National Science Foundation (NSF) Award #1712613
November 14, 2016
The School of Civil and Environmental Engineering recognized excellence in research, teaching and staff support at the School’s annual awards ceremony Nov. 14.
Karen and John Huff School Chair Reginald DesRoches handed out 17 awards to students, faculty and staff along with Ted Russell, chair of the School’s awards committee. The committee decided whom to honor based on the nominations of their colleagues or faculty advisers.
The committee will forward many of the School-level honorees for consideration in the Georgia Tech awards programs this spring.
This year’s winners:
Bill Schutz Junior Faculty Teaching Award
The Colonial Pipeline network’s most recent accident reminds us that our fossil fuel infrastructure is vulnerable
By Matt Smith | November 3, 2016 | Sierra Magazine
Colonial Pipeline fire | Photo courtesy of the Alabaster Fire Department
An explosion that sent a column of smoke towering over the Alabama hills has Southeastern cities bracing for possible price spikes and gasoline shortages for the second time in six weeks.
The Monday afternoon explosion has again shut down the 5,500-mile Colonial Pipeline network, which funnels fuel from Houston to New Jersey—showing the extent to which America’s fossil fuel infrastructure is vulnerable.
“I think the effect may be pretty immediate, given the volume that goes through that pipeline,” said Dr. Iris Tien, an assistant professor of civil engineering at the Georgia Institute of Technology in Atlanta. “One of the shortcomings of our infrastructure is we don’t have a lot of redundancy when it comes to these gas pipelines, so we rely on very few sources for a lot of our supply.” read more…
October 20, 2016
Ph.D. student Chloe Johansen, third from left, brainstorms with her group members on an October morning. Their group is part of the Scheller College of Business’ Technological Innovation: Generating Economic Results program (TI:GER). Johansen is working with two business students and two Emory University law students to commercialize her Ph.D. research. She’s trying to create software to model the behavior and interdependence of infrastructure systems. The group members are, left to right, Scheller MBA student Greg Van Volkenburg, Emory law student Ruohong Yao, Johansen, MBA student Chris Bergman, and law student Victoria Sparks. (Photo: Joshua Stewart)
America’s infrastructure systems are in terrible shape and getting worse.
That’s been the refrain from the American Society of Civil Engineers since its most-recent infrastructure report card found virtually all of the nation’s systems for moving people, energy, commerce, waste are falling apart.
The organization estimates we’ll need to spend $3.6 trillion — with a “t” — by 2020 just to repair or replace what’s failing.
Enter Chloe Johansen, a School of Civil and Environmental Engineering Ph.D. student working in Assistant Professor Iris Tien’s research group.
Johansen, C., Horney, J., and Tien, I., “Metrics for Evaluating and Improving Community Resilience,” ASCE Journal of Infrastructure Systems, Vol. 23, No. 2, June 2017
Abstract — The growing risk of natural and artificial or manufactured hazards combined with a lack of community preparedness have revealed the necessity for comprehensive read more…
August 29, 2016
Iris Tien, left, with Gwinnett County middle school teacher Kathylee McElroy and Jamila Cola after Tien and McElroy won awards for their collaboration on engineering lesson plans for McElroy’s science classes. They’ve been working together for two years through a program made possible by the National Science Foundation Partnerships for Research, Innovation, and Multi-Scale Engineering. Cola is the director of that program.
Georgia Tech’s K-12 outreach program has recognized Assistant Professor Iris Tien for her work helping some Atlanta-area middle school students learn about engineering.
Tien has been working with Northbrook Middle School teacher Kathylee McElroy to incorporate engineering concepts into McElroy’s science lessons. The collaboration won Tien and McElroy 2016 Paul A. Duke GIFT Action Plan Achievement awards earlier this month from Georgia Tech’s Center for Education Integrating Science, Mathematics and Computing (CEISMC).
“It is important to expose students to engineering concepts early, including ideas about risk and hazards, and building civil engineering structures to withstand those hazards,” said Tien, whose work includes risk assessment and decision-making under uncertain conditions. read more…
Tien, I., and Der Kiureghian, A., “Algorithms for Bayesian Network Modeling and Reliability Assessment of Infrastructure Systems,” Reliability Engineering and System Safety, Vol. 156, pp. 134-147, December 2016
Abstract — Novel algorithms are developed to enable the modeling of large, complex infrastructure systems as Bayesian networks (BNs). These include a compression read more…
By Iris Tien | July 19, 2016
A neighborhood on the Westside of Atlanta, an example of the premise that has been stuck in Iris Tien’s mind recently: how the infrastructure civil and environmental engineers build — or the lack thereof in areas like this — influences the surrounding community. (Photo: Iris Tien)
It has been more than a month since the Integrated Network for Social Sustainability (INSS) Conference, organized in part by Serve-Learn-Sustain (SLS) at Georgia Tech, and the topics we discussed still stay with me. As a civil engineer, what has specifically stuck with me, and what I think will continue to color how I think about social sustainability, is the vital role of civil infrastructure in building communities. read more…
Tien, I., Pozzi, M., and Der Kiureghian, A., “Probabilistic Framework for Assessing Maximum Structural Response Based on Sensor Measurements,” Structural Safety, Vol. 61, pp. 43-56, July 2016
Abstract — A probabilistic framework for Bayesian inference combined with extreme values of Gaussian processes is proposed to assess the maximum of the response of an read more…
National Academies Government-University-Industry Research Roundtable (GUIRR): Critical Infrastructure Security
GT in DC | Prepared by Lewis-Burke Associates LLC | February 29, 2016
On February 24, Iris Tien, Assistant Professor at the School of Civil and Environmental Engineering, participated in a panel discussion on threat and impact modeling, at the National Academy’s Critical Infrastructure Security event in Washington, DC. read more…
Detection of Damage and Failure Events of Critical Public Infrastructure Using Social Sensor Big Data
Tien, I., Musaev, A., Benas, D., Ghadi, A., Goodman, S., and Pu, C., “Detection of Damage and Failure Events of Critical Public Infrastructure Using Social Sensor Big Data,” Proceedings of the International Conference on Internet of Things and Big Data (IoTBD 2016), Rome, Italy, pp. 435-440, April 23-25, 2016
Abstract — Public infrastructure systems provide many of the services that are critical to the health, functioning, and security of society. Many of these infrastructures, however, lack continuous physical sensor read more…
2015Semesters Taught: Spring 2018, Spring 2016
Class Size: 20
This course presents fundamental concepts of probability theory, risk analysis, and decision theory through their application to civil engineering systems. It introduces students to the many sources of uncertainty that influence engineering decisions, and provides tools and methods to model and analyze these uncertainties in the context of engineering risk assessment. Emphasis is placed on probabilistic modeling and topics covered include: random variables and functions of random variables, probability distributions for risk analysis in civil and environmental engineering problems, Bayesian methods, and risk-informed decision making.
CRISP Type 1: Multi-Scale Modeling Framework for the Assessment and Control of Resilient Interdependent Critical Infrastructure Systems
Funding Agency: National Science Foundation (NSF) Award #1541074
October 1, 2015
Some of the world’s brightest scholars gather in Saudi Arabia in December to talk about the latest advances in sensing technologies and networks.
The School of Civil and Environmental Engineering’s Iris Tien has been invited to join them. read more…
September 17, 2015
The National Science Foundation has awarded Iris Tien $499,920 for a three-year project that will develop new computer models of infrastructure systems and the connections between them.
The idea is to create a model that can be used for any infrastructure system — water, power, transportation, or communications, for example — and takes into account each component of the system as well as how the system interacts with other infrastructure.
The result will be software that can help utilities make real-time decisions and even automatically adjust how infrastructure operates to account for problems.
“Infrastructure systems are very critical to a functioning society, how we go about our day-to-day lives. They’re critical for the security of our country and for being able to be productive and healthy and safe,” Tien said. “As these systems are subject to more and more hazards of different types, it’s really important for us to be able to model these systems properly and to be able to make decisions about how we manage these systems so they perform better under different adverse conditions.”
Press Release 15-108 | September 14, 2015
Infrastructure must outsmart disruptions to continue delivery of essential goods and services
Americans rely upon critical infrastructure systems to provide services such as clean water, electricity, transportation and healthcare. These systems are becoming increasingly interconnected, while our demands on them and the hazards they face grow.
To address our nation’s critical need for more resilient infrastructure and enhanced services, the National Science Foundation (NSF) has invested $20 million in new fundamental research to transform infrastructure, from physical structures to responsive systems.
Number of COE Women Faculty Puts Tech at the Top Nationally
The relatively low proportion of women in academic science and engineering has been the topic of numerous recent books and reports but as Bob Dylan sang “the times they are a changing.”
Gender diversity has become more valued among college faculty and the College of Engineering has been aggressive in trying to address women’s underrepresentation in the faculty as well as student ranks. The proportion of engineering doctoral degrees earned by women has risen considerably in the past several decades and with it has come opportunities to recruit more women to faculty positions. Today, Tech is the number one producer of women engineers in the country and a leader in female engineering faculty.
Meet some of our “Women in Engineering” faculty members who are changing the world with their research as well as the face of engineering.
Dr. Iris Tien
How would you explain your research?
My research is in creating new ways to model and assess the reliability of complex civil infrastructure systems, including water, energy, communications, and transportation systems. The goal is that flexible and sophisticated models combined with data from a variety of sources will help us make smarter decisions in how we manage these systems so they perform better when bad things happen.
By Amelia Pavlik | February 10, 2015
Iris Tien is an assistant professor in the School of Civil and Environmental Engineering at Georgia Tech. Recently, the Office of Faculty Affairs had the opportunity to learn more about Tien and her time at Tech. Here’s what she said.
Tell us a little about your research.
I develop new ways to model and assess the reliability of civil infrastructure systems, including water, power, and transportation systems. The goal is to help us make smarter decisions in how we design and manage these critical systems, so they perform better under adverse conditions. What can we do, for example, read more…
Funding Agency: Georgia Department of Transportation (GDOT) Project #RF471
Tien, I., and Der Kiureghian, A., “Compression and Inference Algorithms for Bayesian Network Modeling of Infrastructure Systems,” In T. Haukaas, ed., Proceedings of the 12th International Conference on Applications of Statistics and Probability in Civil Engineering, Vancouver, Canada, July 12-15, 2015
Abstract — The Bayesian network (BN) is an ideal tool for modeling and assessing the reliability of civil infrastructure, particularly when the information about the system and its components is uncertain and read more…
Tien, I., Pozzi, M., and Der Kiureghian, A., “A Dynamic Bayesian Network Framework for Risk Assessment of Systems Based on Sensor Measurements,” In T. Haukaas, ed., Proceedings of the 12th International Conference on Applications of Statistics and Probability in Civil Engineering, Vancouver, Canada, July 12-15, 2015
Abstract — In this paper, a framework based the dynamic Bayesian network (DBN) is proposed to dynamically monitor the response of structures to hazards. The methodology enables the probabilistic analysis of read more…
Tien, I., “Bayesian Network Methods for Modeling and Reliability Assessment of Infrastructure Systems,” ASCE Structural Engineering Institute Structures Congress, Portland, OR, April 23-25, 2015
Summer 2018: from left: Ph.D. student Yanjie Tong, Ph.D. student Ajay Saini, Ph.D. student Cynthia Lee, Ph.D. student Chloe Johansen Applegate, PI Tien, Ph.D. Student Yijian Zhang
Celebrating Chloe’s graduation; congratulations, Chloe!
Summer 2017: from left: Ph.D. student Cynthia Lee, Ph.D. student Chloe Johansen, Ph.D. student Ajay Saini, Ph.D. student Yanjie Tong, PI Tien
Fall 2016: from left: Ph.D. student Chloe Johansen, Ph.D. student Cynthia Lee,
PI Tien, Ph.D. student Yanjie Tong, Ph.D. student Ajay Saini
Semesters Taught: Spring 2019, Spring 2017, Spring 2015
Class Size: 15
This course presents a comprehensive and in-depth coverage of modern methods for structural and system reliability assessment. It provides insights and perspectives on the use of probability-based tools and methods for the analysis of the reliability of structures under hazards, and serves to establish a strong starting point for research in the field of structural reliability. Topics include multivariate distribution models; formulation of structural reliability for components and systems; exact solutions; computational reliability methods, including first- and second-order reliability methods, Monte Carlo simulation, and importance sampling; reliability sensitivities; importance measures; and reliability analysis under statistical and model uncertainties.
September 30, 2014
Iris Tien is the newest member of the School of Civil and Environmental Engineering faculty, joining the school this fall after completing her Ph.D. at the University of California, Berkeley. She took a few minutes recently to talk about her work and why it’s important to her.
Q: I was reading a little bit about your background and I saw you started out in medical research when you were an undergrad studying civil engineering. How did that happen?
A: I’m not your most traditional civil engineering person. read more…
Semesters Taught: Fall 2018, Fall 2016, Fall 2015, Fall 2014
Level: Upper-division undergraduate
Class size: 70
This course provides fundamental concepts in the planning, design, and construction of civil engineering projects. It provides an introduction to the topics of project delivery, contracts, engineering economics, cost estimation, bidding, risk analysis, scheduling, project controls, and construction law, and presents tools and techniques for the management and control of resources (e.g., time, money) on construction engineering projects.
Tien, I., and Der Kiureghian, A., “A Compression Algorithm for Inference in Bayesian Network Models of Infrastructure Systems,” ASCE Engineering Mechanics Institute Conference, Evanston, IL, August 4-7, 2013
Tien, I., and Der Kiureghian, A., “Compression Algorithm for Bayesian Network Modeling of Binary Systems,” In G. Deodatis, B. Ellingwood, and D. Frangopol, eds., Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures, New York: CRC Press, pp. 3075-3081, June 2013
Abstract — A Bayesian network (BN) is a useful tool for analyzing the reliability of systems. The BN framework is limited, however, by the size and complexity of the system that can be tractably modeled. Each node in read more…
Inference on Maximum Structural Response Based on Measured Accelerations Using Dynamic Bayesian Network
Tien, I., Pozzi, M., and Der Kiureghian, A., “Inference on Maximum Structural Response Based on Measured Accelerations Using Dynamic Bayesian Network,” In G. Deodatis, B. Ellingwood, and D. Frangopol, eds. Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures, New York: CRC Press, pp. 2481-2488, June 2013
Abstract — A dynamic Bayesian network (DBN) is a useful tool for analyzing uncertain systems that evolve with time. As such, it is useful in structural health monitoring applications where measurements can be read more…
It’s easy to forget that consequences, even unintended ones, sometimes can be positive.
After Hurricane Katrina closed universities in New Orleans, UC officials offered students a chance to spend fall semester of 2005 at various UC campuses, including Berkeley. Their only motive was humanitarian. But the gesture affected students, including at least one at UC Berkeley, in unanticipated ways.
Iris Tien was an undergraduate then. As a resident assistant, responsible for two floors of an eight-floor dormitory, she was responsible for converting dormitory lounges into bedrooms and hosting events to help the New Orleans students feel at home.
Fast forward seven years. As a 24-year-old civil and environmental engineering graduate student in UC Berkeley’s Civil Systems Program, Tien is modeling complex infrastructure — research that might someday be used to determine weak spots in bridges, highways and water systems, including the kinds of levees that broke under the onslaught of Hurricane Katrina.
As the U.S. grapples with declining infrastructure and tight budgets, Tien’s work could prove particularly useful. Last year, the American Society of Civil Engineers reported that the poor condition of our highways, railroads, bridges and transit systems cost $130 billion in 2010 alone. To bring infrastructure back to minimum standards, the U.S. would need to invest $846 billion over nine years, or $94 billion per year. Yet partisan politics is keeping investment at a minimum.
It’s no wonder that Tien’s research on infrastructure cost-saving is getting attention. read more…
By Dick Corten, slideshow by Peg Skorpinksi | March 21, 2012
It was not hard for a good time to be had by all. The atmosphere was convivial, the mood was celebratory, there were plenty of people to talk to, and — always a priority for grad students — there was food. And not only that, the food was good.
The occasion was the Berkeley Distinguished Graduate Fellows Reception, an annual event, held this year in the banner-festooned auditorium of International House read more…
Tien, I., and Aminoff, M., “Using a Wireless Inertial Sensor System to Characterize Gait Abnormalities in Parkinson’s Disease,” Movement Disorders, Vol. 27, Issue Supplement S1, pp. S142, June 2012
By Nicole Freeling | March 15, 2012
To many people, graduate student research is a little-known corridor in the halls of higher education. To some it is perceived as a mysterious side nook in the ivory tower, where esoteric research is conducted for obscure ends.
On March 14, a delegation of 20 graduate students and deans traveled to Sacramento to give lawmakers a very different perspective: that of graduate student research as central not only to the future of the University of California, but to that of the state and the nation as well. read more…
Impact of Online Marketing Channels on Customer Purchase Visits: Aggregate- and Individual-Level Models
Tien, I., and Jamal, Z., “Impact of Online Marketing Channels on Customer Purchase Visits: Aggregate- and Individual-Level Models,” HP Labs Technical Report, August 2011
This is a series of profiles featuring interviews with some of this year’s crop of summer interns at HP Labs.
We continue the series with an interview with Iris Tien who was recruited by the Services Research Lab.
A Bay Area native, Iris Tien gets to stay with her parents in Cupertino while interning at HP Labs’ Palo Alto campus. “It’s good, actually!” she assures us, “plus I get to bike to work about twice a week.” Usually, Tien lives over in Berkeley, where she’s entering her fourth year as a PhD student in Systems Engineering at the University of California. She attended UC Berkeley as an undergraduate, too, majoring in Civil and Environmental Engineering. When she’s not crunching numbers, Tien enjoys playing basketball and tennis, listening to opera, and making jewelry.
HP: What have you been working on during your internship?
I’ve been working with Zainab Jamal and Fereydoon Safai in HP’s Services Research Lab as part of the Marketing Optimization Project. Specifically, I’ve been looking at HP customer data and relating it to how HP spends its online marketing resources. I’m interested in understanding how the channels through which people arrive at the HP Shopping site – like search, coupons or email — impact what different customers do.
HP: Can you tell us what you’ve found out?
Well, a lot of this is proprietary, but read more…
Characterization of Gait Abnormalities in Parkinson’s Disease Using a Wireless Inertial Sensor System
Tien, I., Glaser, S., and Aminoff, M., “Characterization of Gait Abnormalities in Parkinson’s Disease Using a Wireless Inertial Sensor System,” 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Buenos Aires, Argentina, pp. 3353-3356, August 31-September 4, 2010
Abstract — Gait analysis is important in diagnosing and evaluating certain neurological diseases such as Parkinson’s disease (PD). In this paper, we show the ability of our wireless inertial sensor system to read more…
Tien, I., Glaser, S., Bajcsy, R., Goodin, D., and Aminoff, M., “Results of Using a Wireless Inertial Measuring System to Quantify Gait Motions in Control Subjects,” IEEE Transactions on Information Technology in Biomedicine, Vol. 14, No. 4, pp. 904-915, July 2010
Abstract — Gait analysis is important for the diagnosis of many neurological diseases such as Parkinson’s. The discovery and interpretation of minor gait abnormalities can aid in early diagnosis. We have used an read more…
Structural Health Monitoring and Evaluation of Human Gait to Assist in the Diagnosis of Parkinson’s Disease
Tien, I., and Glaser, S., “Structural Health Monitoring and Evaluation of Human Gait to Assist in the Diagnosis of Parkinson’s Disease,” Proceedings, 7th International Workshop on Structural Health Monitoring, Stanford, CA, September 9-11, 2009
Abstract — The human body is a complex structure, and its structural health can be monitored using sensors. A system using wireless inertial measurement units for data acquisition and the monitoring of human read more…
Detecting and Quantifying Gait Abnormalities in Parkinson’s Patients Using Wireless Inertial Measurement Units
Tien, I., “Detecting and Quantifying Gait Abnormalities in Parkinson’s Patients Using Wireless Inertial Measurement Units,” Center for Information Technology Research in the Interest of Society Open House, Berkeley EECS Annual Research Symposium, Berkeley, CA, February 2009
Tien, I., “Quantifying Diagnosis of Neurological Conditions,” Scientific Colloquium for Healthcare, Engineering and Medicine, UC Davis Medical Center, Davis, CA, May 2008
Nathaniel Butler and Audra Nemir, graduate students in Environmental Engineering, and Iris Tien, graduating CEE undergraduate entering the Civil Systems program in fall 2008, received National Science Foundation Scholarships. Nathaniel’s adviser is Professor James Hunt. Audra’s adviser is Professor Lisa Alvarez-Cohen. Iris’s adviser with be Professor Steven Glaser.
Congratulations, Nathaniel, Audra, and Iris!
Two graduating CEE seniors, Iris Tien and Jenna Wong, were awarded Chancellor’s Fellowships. Chancellor’s Fellowships are given to exceptional students of outstanding achievement who are entering a Berkeley doctoral program. Iris will enter the Civil Systems program and Jenna will enter the Structural Engineering, Mechanics and Materials program.
Congratulations, Iris and Jenna!
Tien, I., “Quantifying Diagnosis of Neurological Conditions,” Center for Information Technology Research in the Interest of Society Open House, Berkeley EECS Annual Research Symposium, February 2008
The University of California, Berkeley is one of the world’s premier research universities, maintaining a dynamic environment in which top-notch researchers create and freely disseminate the very best scholarly contributions and scientific discoveries. Berkeley is consistently rated among the very best institutions for the quality and breadth of its research enterprise, the scholarly distinction of its faculty, and the excellence of its Ph.D. programs.
Berkeley researchers — many of them leading experts in their fields — are dispersed among more than 130 academic departments and more than 80 interdisciplinary research units. The Berkeley research enterprise spans the full spectrum of the discovery process — from basic research that fuels remarkable, and sometimes unforeseen, breakthroughs to applied, late-stage projects that offer actionable solutions to real-world problems.
Cranz, G., Wendover, J., Tien, I., Gillem, M., and Norman, J., “Chapter 9: A Post-Occupancy Evaluation of the Temporary Home of the College of Environmental Design on the UC Berkeley Campus,” Designing for Designers: Lessons Learned from Schools of Architecture, Fairchild Books, September 2007
Cranz, G., and Tien, I., “Post-Occupancy Evaluation of the San Francisco Public Library,” Annual Conference of the Association for Applied and Clinical Sociology, San Jose, CA, October 26-28, 2006
If your department were a car, what car would it be?
Iris Tien, CEE sophomore
A pickup truck because it’s very practical and can carry around a bunch of construction materials.
By Jina Lee | March 8, 2003
Two young talented musicians, both Phillips Academy seniors, captivated the packed audience in the Cochran Chapel last Friday night with their passionate performances. The concert also showcased the results of the hard work and dedication of the orchestras and ensembles over the course of the term. read more…
By Michelle Ku | September 1, 1999
For a new sixth or seventh grader, life at a middle school can be a frightening prospect. But the Cupertino Union School District is taking steps to quell these fears.
This year, all four middle schools are implementing WEB–Welcome Every Body–an orientation program that helps students transition and acclimate themselves from elementary school to the middle school environment. read more…