Phd Dissertation

Human-centered computing and the future of work : lessons from mechanical turk and turkopticon, 2008-2015

Publication Date

June 30, 2015

Areas of Expertise

Abstract

Online labor markets such as Amazon Mechanical Turk (AMT), Uber, and TaskRabbit are contributing to rapid changes in the nature of work for hundreds of thousands of workers. These markets create significant new economic opportunities, but most currently treat workers as second-class citizens. Take-home pay is often low compared to similar work in traditional employment arrangements, and workers have limited means of influencing market design or management practice. This makes it hard for workers to create reliable livelihoods from the opportunities these markets present. This dissertation uses AMT, an online labor market for small information tasks, as a case through which to examine the consequences of treating workers as second-class citizens, to argue that future platform designs and management practices should treat workers as central stakeholders, and to develop theory and method for doing so. The central argument of the dissertation is that workers’ concerns should be more substantively and systematically addressed in the design and operation of online labor markets. Five messages elaborate this argument. First, in online labor markets, some workers are casual or transient, while others are professionals, providing significant and reliable value to customers and relying on income earned in the market to meet basic needs. Second, workers who rely on income earned through online labor markets should be considered first-class stakeholders, alongside customers and shareholders. Third, workers in online labor markets are rarely the narrowly self-interested profit maximizers of classical economic theory. Workers can be better understood as “situatedly rational” actors: human beings with incomplete information and finite cognitive capabilities whose actions and preferences are shaped by many factors, including rules, norms, and expectations. Fourth, online labor markets are not monolithic, perfectly competitive markets but parts of polycentric economic systems composed of complexly interlinked action situations characterized by imperfect competition and incomplete information. Fifth, institutions supporting crowd work research should develop an interdisciplinary practice-oriented agenda to understand the consequences of current online labor market designs and practices, and to develop new designs and practices that incorporate workers who rely on market income as central stakeholders.

Suggested Citation
MICHAEL SILBERMAN (2015) Human-centered computing and the future of work : lessons from mechanical turk and turkopticon, 2008-2015. PhD Dissertation. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/17uq3m8/alma991017757829704701.

published journal article

Multi-stage charging and discharging of electric vehicle fleets

Transportation Research Part D: Transport and Environment

Publication Date

May 1, 2023

Author(s)

Matthew Dean, Felipe De Souza, Krishna Murthy Gurumurthy, Kara Kockelman

Abstract

Fleets of electric vehicles will likely shift electricity demand, and the effect of upstream charging emissions will come from generation sources that are dispatched in response. This study proposes a multi-stage charging and discharging problem to translate low-cost energy transactions into vehicle dispatch decisions. A day-ahead charging optimization problem minimizes electricity purchases and marginal emissions damages, with energy transactions becoming targets in an optimization-based dispatch strategy for an on-demand shared autonomous electric vehicle (SAEV) fleet. The framework was tested for Austin, Texas, using an agent-based simulator. Fleets can schedule charging to lower daily power costs (averaging 15.5% or $0.79/day/SAEV) while reducing health damages from generation-related pollution (2.8% or $0.43/day/SAEV). Fleet managers can increase profits ($8 per SAEV per day) by adopting a multi-stage charging and discharging strategy that can serve more passengers per day than price-agnostic dispatch strategies.

Suggested Citation
Matthew D. Dean, Felipe Augusto de Souza, Krishna Murthy Gurumurthy and Kara M. Kockelman (2023) “Multi-stage charging and discharging of electric vehicle fleets”, Transportation Research Part D: Transport and Environment, 118, p. 103691. Available at: 10.1016/j.trd.2023.103691.

working paper

Real-time Vehicle Reidentification System for Freeway Performance Measurements

Abstract

Computational resources in the traffic operation field as well as the bandwidth of field communication links, are often quite limited. Accordingly, for real-time implementation of Advanced Transportation Management and Information Systems (ATMIS) strategies, such as vehicle reidentification, there is strong interest in development of field-based techniques and models that can perform satisfactorily while minimizing computational and communication requirements in the field. The ILD (Inductive Loop Detector)-based Vehicle ReIDentification system (ILD-VReID) is an example of a currently applied approach. Although ILDs are not without limitations as a traffic sensor, they are widely used for historical reasons and the sunken investment in the large installed base makes their use in this research highly cost-effective. Therefore, this dissertation develops a new vehicle reidentification algorithm, RTREID-2, for real-time implementation by adopting a PSR (Piecewise Slope Rate) approach that extracts features from raw vehicle signature data. The results of cases studies indicate that RTREID-2 is capable of accurately providing individual vehicle tracking information and performance measurements such as travel time and speed. The potential contributions of RTREID-2 are: application to square and round single loop configurations, and reduced computational requirements because re-estimation or transferability of the speed models used in the previously developed approach is not necessary. As a consequence, RTREID-2 is free of site-specific calibration and transferability issues. A freeway corridor study also demonstrates that RTREID-2 has the potential to be implemented successfully in a congested freeway corridor, utilizing data obtained from both homogenous and heterogeneous loop detection systems. A real-time vehicle classification model, which is based on the PSR approach, was also developed on the part of RTREID-2. The classification model can successfully classify vehicles into 15 classes using single loop detector data without any explicit axle information. The initial results also suggest the potential for transferability of the vehicle classification approach and are very encouraging. To investigate real-time freeway performance measurement in a realworld setting, the design of a RTPMS (Real-time Traffic Performance Measurement System) that is based on RTREID-2 is also presented in this dissertation. A simulation of RTPMS is conducted to evaluate its feasibility. The simulation results demonstrate the potential of implementing RTPMS in real world applications.

Phd Dissertation

Network surveillance supported object-based and task-based time-bounded fault tolerance schemes and their incorporation into a timeliness-guaranteed kernel

Abstract

Real-time fault tolerance (RTFT) is a core technology for increasing the reliability of computer-based safety-critical applications such as space applications, factory automation systems, etc. In recent years, the real-time computing market has started showing explosive growth. In order to realize highly robust real-time fault tolerant computing stations, several component techniques are necessary. Among the most significant include (a) a scaleable RTFT scheme, (b) a network surveillance (NS) scheme, (c) a timeliness-guaranteed kernel that supports both the RTFT and the NS schemes. This dissertation attempts to make a significant step forward towards the goal of realizing ultra-reliable computer-based safety-critical systems. As a first step in this direction, the following new technologies have been devised: (i) the primary-shadow time-triggered message-triggered object (TMO) replication (PSTR) scheme which provides time-bounded recovery from faults in TMO structured systems, (ii) the supervisor-based network surveillance (SNS) scheme which is effective in a variety of point-to-point networks and is amenable to fault detection latency bound analysis. Second, it was observed that even though a few promising component technologies that addressed certain specific requirements of real-time fault tolerant computing stations have been established, little efforts were made to integrate these technologies. Only such integrated technologies can meet the diverse demands that are imposed by safety-critical applications. This dissertation attempts to establish guidelines for such integration. The following integrated schemes have been devised: (i) the PSTR scheme and the SNS scheme, (ii) the distributed recovery block (DRB) scheme established earlier and the SNS scheme, (iii) the adaptable DRB scheme established earlier and the SNS scheme. Third, convincing demonstrations of the validity and potential utility of the devised schemes would facilitate their use in real-world applications. A timeliness-guaranteed kernel developed earlier was extended to support all the devised schemes. A TMO-structured defense application supported by the newly extended kernel was also made fault-tolerant. Finally, the performance analyses of the RTFT and NS schemes, even though of great importance, have been scarcely practiced. We have analyzed the performance of the devised schemes and obtained some tight time bounds. The modeling and analysis techniques presented would serve as useful guides to system engineers.

Suggested Citation
Chittur Subbaraman (1997) Network surveillance supported object-based and task-based time-bounded fault tolerance schemes and their incorporation into a timeliness-guaranteed kernel. PhD Dissertation. UC Irvine. Available at: https://uci.primo.exlibrisgroup.com/permalink/01CDL_IRV_INST/1go3t9q/alma991035092938504701.

policy brief

Understanding the Causes and Consequences of Local Growth Control

Abstract

In California, there has been a growing concern about rising housing cost burdens. Declining housing affordability, particularly in job-rich areas, can lead to lengthy commutes and pose significant challenges to achieving sustainable transportation and development patterns. It may also cause disproportionate impacts on vulnerable population groups by pushing members of these group to areas where jobs and other amenities are limited. Although no single factor can fully explain the rise of this critical issue, local growth control measures (e.g., growth moratoriums, density restrictions, and public facilities requirements) and other strict land use regulations have been criticized for constraining the housing supply and adding to jobs-housing imbalances. It is important to understand what motivates local growth control actions, as well as how these controls may affect land use, housing, and transportation.

Suggested Citation
Jae Hong Kim, Nene Osutei and Nicholas Marantz (2020) Understanding the Causes and Consequences of Local Growth Control. Policy Brief. UC ITS. Available at: https://doi.org/10.7922/g2ht2mmh.

published journal article

Airport congestion when carriers have market power

American Economic Review

Publication Date

November 1, 2002

Author(s)

Abstract

This paper analyzes airport congestion when carriers are nonatomistic, showing how the results of the road-pricing literature are modified when the economic agents causing congestion have market power. The analysis shows that when an airport is dominated by a monopolist, congestion is fully internalized, yielding no role for congestion pricing under monopoly conditions. Under a Cournot oligopoly, however, carriers are shown to internalize only the congestion they impose on themselves. A toll that captures the uninternalized portion of congestion may then improve the allocation of traffic. The analysis is supported by some rudimentary empirical evidence.

Suggested Citation
Jan K Brueckner (2002) “Airport congestion when carriers have market power”, American Economic Review, 92(5), pp. 1357–1375. Available at: 10.1257/000282802762024548.

published journal article

An Agent-based Cooperative Lane-Changing System with Payments

Procedia Computer Science

Abstract

Traffic advisories to travelers are based upon traffic state information at the link level. However, with the advances in automotive technology, sensing equipment, and the Internet of Things (IoT), we can leverage more granular information. Research shows that faster and more accurate travel paths can be obtained by using lane data rather than link data. For vehicles to be able to change lanes to improve their travel times, operationally, they would need to enter into Peer-to-Peer negotiations with surrounding vehicles, where they can trade their position in time and space in exchange for monetary benefits. Our work is an exploration of this idea. We propose an agent-based optimization framework for this system, which minimizes both travel time and the “envy” induced among drivers when they are assigned paths that are inferior to their peers. Numerical results from running our optimization on an illustrative off-ramp network show that the proposed model converges to both envy-free and system optimum traffic states, even at a net zero budget, meaning this system can be used by transportation agencies without exacting tolls or giving subsidies.

Suggested Citation
Riju Lavanya, Daisk Nam and R. Jayakrishnan (2024) “An Agent-based Cooperative Lane-Changing System with Payments”, Procedia Computer Science, 238, pp. 785–790. Available at: 10.1016/j.procs.2024.06.092.

published journal article

Improved path flow estimator for Origin–Destination trip tables

Transportation Research Record

Publication Date

January 1, 2005

Author(s)

Piya Chootinan, Anthony Chen, Will Recker
Suggested Citation
Piya Chootinan, Anthony Chen and Will Recker (2005) “Improved path flow estimator for Origin–Destination trip tables”, Transportation Research Record, 1923(1), pp. 9–17. Available at: 10.1177/0361198105192300102.

conference paper

Discovering fine-grained RRC state dynamics and performance impacts in cellular networks

Proceedings of the 20th annual international conference on Mobile computing and networking - MobiCom '14

Publication Date

January 1, 2014

Author(s)

Sanae Rosen, Haokun Luo, Qi Alfred Chen, Z. Morley Mao, Jie Hui, Aaron Drake, Kevin Lau
Suggested Citation
Sanae Rosen, Haokun Luo, Qi Alfred Chen, Z. Morley Mao, Jie Hui, Aaron Drake and Kevin Lau (2014) “Discovering fine-grained RRC state dynamics and performance impacts in cellular networks”, in Proceedings of the 20th annual international conference on Mobile computing and networking - MobiCom '14. ACM Press, pp. 177–188. Available at: 10.1145/2639108.2639115.

research report

Route-based Freight Activity Metrics along the California State Highway System through a Pilot Multi Sensor Fusion System

Abstract

This research project investigates the integration of point detector data to enhance vehicle tracking for heavy-duty trucks in Southern California. Leveraging a combination of automated license plate readers (ALPR) and inductive signature data, we aim to enhance the accuracy of vehicle monitoring, addressing limitations of traditional telematics data, such as sampling bias and data quality issues. Our research draws upon a dataset from sites deployed in the Freight Mobility Living Laboratory (FML2) testbed, enabling a comprehensive analysis of truck activity. Employing a Bayesian Logit model and principal component analysis, we developed an innovative framework aimed at improving truck tracking accuracy across key routes by matching inductive signatures. Findings indicate that integrating these advanced data sources leads to more accurate classifications and tracking of freight vehicles, ultimately contributing to better-informed planning and environmental sustainability efforts by Caltrans, the California Air Resources Board, and local agencies. By focusing on critical highways like I-710 and SR-60, we identify significant opportunities for optimizing freight mobility and addressing the increasing pressures on transportation infrastructure in urban settings. This research highlights the importance of innovative data integration techniques in developing effective traffic management strategies that meet the evolving demands of urban freight operations.

Suggested Citation
Stephen G. Ritchie, Andre Y.C. Tok, Tanjeeb Ahmed and Mingqi Yao (2024) Route-based Freight Activity Metrics along the California State Highway System through a Pilot Multi Sensor Fusion System. Final Report PSR-23-03 TO 073. PSR / ITS-Irvine. Available at: https://www.metrans.org/assets/research/route%20based%20freight%20activity%20metrics%20along%20the%20california%20state%20highway%20system%20through%20a%20pilot%20multi%20sensor%20fusion%20system.pdf.