working paper

A Model of Household Interactions in Activity Patterns

Publication Date

May 1, 1989

Working Paper

UCI-ITS-WP-89-9, UCI-ITS-AS-WP-89-1, UCTC 15

Abstract

Time is an important aspect of the activity patterns of individuals. An activity pattern can be described by means of a time-space diagram (Hagerstrand, 1970), that describes, for each moment within a given time interval, the location and type of activity of an individual. These time-space patterns are the result of various decisions and events experienced by that individual. In this paper, we will focus on the time dimensions of the space-time activity patterns of individuals. More specifically, we will focus attention on the allocation of time to a number of out-of-home activities. Other aspects, such as the timing and scheduling of activities are outside the scope of this paper.

Suggested Citation
Leo J.G. van Wissen (1989) A Model of Household Interactions in Activity Patterns. Working Paper UCI-ITS-WP-89-9, UCI-ITS-AS-WP-89-1, UCTC 15. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/1j36k4h3.

conference paper

Adaptive estimation of signals of opportunity

27th international technical meeting of the satellite division of the institute of navigation, ION GNSS 2014

Publication Date

January 1, 2014

Author(s)

Zaher Kassas, V. Ghadiok, T.E. Humphreys
Suggested Citation
Z.M. Kassas, V. Ghadiok and T.E. Humphreys (2014) “Adaptive estimation of signals of opportunity”, in 27th international technical meeting of the satellite division of the institute of navigation, ION GNSS 2014, pp. 1679–1689.

conference paper

Advances in modelling network dynamics incorporating behavioural considerations

Travel Behaviour research in an Evolving World, selected papers from the 12th International Conference on Travel behavior Research

Publication Date

January 1, 2012

Author(s)

Andre de Palma, R. (Jay) Jayakrishnan, Karthik C Konduri
Suggested Citation
Andre de Palma, R Jayakrishnan and Karthik C Konduri (2012) “Advances in modelling network dynamics incorporating behavioural considerations”, in R.M. Pendyala and C.R. Bhat (eds.) Travel Behaviour research in an Evolving World, selected papers from the 12th International Conference on Travel behavior Research. Lulu. com, pp. 367–372.

published journal article

A mathematical programming formulation of the household activity rescheduling problem

Transportation Research Part B: Methodological

Suggested Citation
Li Ping Gan and Will Recker (2008) “A mathematical programming formulation of the household activity rescheduling problem”, Transportation Research Part B: Methodological, 42(6), pp. 571–606. Available at: 10.1016/j.trb.2007.11.004.

book/book chapter

Multiple imputation methodology for missing data, non-random response, and panel attrition

Publication Date

January 1, 1998

Author(s)

Suggested Citation
David Brownstone (1998) “Multiple imputation methodology for missing data, non-random response, and panel attrition”, in Theoretical foundations of travel choice modeling. Elsevier, pp. 421–449. Available at: 10.1016/b978-008043062-1/50019-1.

conference paper

Circuit inspired modeling method for irrigation

2018 21st euromicro conference on digital system design (DSD)

Publication Date

August 1, 2018

Author(s)

Davit Hovhannisyan, Ahmed Eltawil, Mohammad Al Faruque, Fadi Kurdahi
Suggested Citation
Davit Hovhannisyan, Ahmed Eltawil, Mohammad Al Faruque and Fadi Kurdahi (2018) “Circuit inspired modeling method for irrigation”, in 2018 21st euromicro conference on digital system design (DSD). IEEE, pp. 328–335. Available at: 10.1109/dsd.2018.00064.

research report

Review current methods for allocating average weekday mobile source emissions to weekend days

Abstract

This report provides a review of the California Air Resources Board’s current method for adjusting estimated emissions from on-road motor vehicles. These estimates are a critical feature of CARB’s air quality modeling efforts, which are an important tool for maintaining and improving California’s air quality. The central approach of the method adjusts “average weekday” emissions estimates using fac- tors derived from measurements of diurnal and day-of-week variations in multi-class vehicle ac- tivity provided by Caltrans from automated vehicle classifer (AVC) data. The diurnal factors are used to adjust the inputs to the Direct Travel Improvment Model (DTIM), which provides gridded, hourly estimates that are assumed to represent general spatio-temporal emissions patterns on an average weekday. The day-of-week factors are used to adjust the average weekday county-wide emissions estimates produced by EMFAC, CARB’s tool for estimating emissions from on-road ve- hicles. The day specific spatio-temporal DTIM patterns are then used to produce hourly, gridded emissions from the county-wide EMFAC totals. The body of this report begins with a review the general methodology in the context of the broader model. It continues with a review of the SAS programs that compute the diurnal and day-of-week factors from Caltrans AVC data. We conclude with some recommendations for how the method might be improved over the near-term and long term.

Suggested Citation
Craig R Rindt, James E Marca and Will W Recker (2012) Review current methods for allocating average weekday mobile source emissions to weekend days. Final Report. Available at: https://escholarship.org/uc/item/4vd249bf.

published journal article

The impact of plug-in vehicles on greenhouse gas and criteria pollutants emissions in an urban air shed using a spatially and temporally resolved dispatch model

Journal of Power Sources

Publication Date

December 1, 2011
Suggested Citation
Ghazal Razeghi, Tim Brown and G. Scott Samuelsen (2011) “The impact of plug-in vehicles on greenhouse gas and criteria pollutants emissions in an urban air shed using a spatially and temporally resolved dispatch model”, Journal of Power Sources, 196(23), pp. 10387–10394. Available at: 10.1016/j.jpowsour.2011.08.043.

working paper

Part-Time Operators in Public Transit: Experiences and Prospects

Publication Date

April 1, 1985

Working Paper

UCI-ITS-WP-85-3

Areas of Expertise

Abstract

Most U.S. transit agencies have begun to use part-time operators as a means to reduce operating cost. This report, based on five case studies, evaluates the cost savings and organizational impacts associated with this change. Results indicate that cost savings have been small but significant in situations where peak service expansion occurred. But where the schedule was static, contract protections for existing operators have made it difficult to use part-time labor, and hence savings were small or insignificant. We find that in transit agencies with highly peaked schedules, part-time operators (PTOs) save money for two reasons: they improve schedule efficiency (the ratio of hours-paid to hours-worked), and their wages and fringe benefits are lower than those of full time operators. In agencies with relatively flat schedules the only savings is from lower wages and fringes, and it is possible that this kind of “two-tier” wage system may be bargained away over time. We find that for agencies with flat or static schedules, it may be more effective to concentrate on alternative strategies such as absenteeism control and extraboard staffing which may be more beneficial and easier to implement. On the organizational side, we find no unusual costs associated with use of PTOs. They have proven to be as reliable, or even more so, than full time operators; they have not created unusual supervisory costs, and there have been relatively few problems between part-time and full-time operators. We also find that instead of creating a permanent force of PTOs, as had been anticipated, most of the PTOs that were hired really wanted full-time work.

Suggested Citation
Kenneth M. Chomitz, Genevieve Giuliano and Charles A. Lave (1985) Part-Time Operators in Public Transit: Experiences and Prospects. Working Paper UCI-ITS-WP-85-3. Institute of Transportation Studies, Irvine. Available at: https://escholarship.org/uc/item/1jm5106j.

published journal article

Business Churning and Neighborhood Instability: Is There a Link?

International Regional Science Review

Publication Date

January 12, 2023

Author(s)

Jae Hong Kim, Kevin Kane, Young-An Kim, John R. Hipp

Abstract

Much of the work concerning economic dynamism has focused on its aggregate-level implications, while there have been rising concerns about business displacement at the community or neighborhood level. In this article, we analyze this important (restructuring) process using detailed establishment-level business information and explore how it manifests itself across space within the Los Angeles—Long Beach—Santa Ana, CA Urbanized Area. We also investigate the association between business churning and neighborhood-level housing vacancy rates to understand the implications of dramatic changes in the business landscape. We find that housing vacancies are more likely to increase in urban neighborhoods with a higher establishment death rate, while the creation of new businesses can mitigate the association to some extent. We also detect substantial variation across decades not only in the spatial distribution of business churning but also in its association with housing vacancy rates, suggesting the evolving nature of business dynamics and their implications.

Suggested Citation
Jae Hong Kim, Kevin Kane, Young-An Kim and John R. Hipp (2023) “Business Churning and Neighborhood Instability: Is There a Link?”, International Regional Science Review, p. 01600176221145873. Available at: 10.1177/01600176221145873.