There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Customer satisfaction, customer retention, and market share

Research in transportation, urban design, and planning has examined associations between physical environment variables and individuals' walking and cycling for transport. Constructs, methods, and findings from these fields can be applied by physical activity and health researchers to improve understanding of environmental influences on physical activity. In this review, neighborhood environment characteristics proposed to be relevant to walking/cycling for transport are defined, including population density, connectivity, and land use mix. Neighborhood comparison and correlational studies with nonmotorized transport outcomes are considered, with evidence suggesting that residents from communities with higher density, greater connectivity, and more land use mix report higher rates of walking/cycling for utilitarian purposes than low-density, poorly connected, and single land use neighborhoods. Environmental variables appear to add to variance accounted for beyond sociodemographic predictors of walking/cycling for transport. Implications of the transportation literature for physical activity and related research are outlined. Future research directions are detailed for physical activity research to further examine the impact of neighborhood and other physical environment factors on physical activity and the potential interactive effects of psychosocial and environmental variables. The transportation, urban design, and planning literatures provide a valuable starting point for multidisciplinary research on environmental contributions to physical activity levels in the population.

Environmental correlates of walking and cycling: Findings from the transportation, urban design, and planning literatures

Accessibility evaluation of land-use and transport strategies: review and research directions

Highway Capacity Manual改訂の動向--テイラ-教授の講演より

http://www.its.uci.edu/its/personnel/recker/A75.pdf

Freeway safety as a function of traffic flow

http://www.its.uci.edu/its/personnel/recker/A41.pdf

An analysis of the severity and incident duration of truck-involved freeway accidents.

The authors argue that for the cross-sectional multiattribute approach to choice modeling, the multinomial logit is theoretically and empirically superior to the more commonly used regression appro...

The Multinomial, Multiattribute Logit Choice Model:

The household activity pattern problem of analyzing/predicting the optimal path of household members through time and space as they complete a prescribed agenda of out-of home activities is posed as a variant of the pickup and delivery problem with time windows. The most general case of the model includes provision for vehicle transfer, selective activity participation, and ridesharing options. A series of examples are solved using generic algorithms. The model is purported to remove existing barriers to the operationalization of activity-based approaches in travel behavior analysis.

The Household Activity Pattern Problem: General Formulation and Solution

/pdf/a-model-of-complex-travel-behavior-part-ii-an-operational-1acrdfit2m.pdf

Wilfred W. Recker

Papers

Freeway safety as a function of traffic flow

An analysis of the severity and incident duration of truck-involved freeway accidents.

The Multinomial, Multiattribute Logit Choice Model:

The Household Activity Pattern Problem: General Formulation and Solution

A model of complex travel behavior: Part II—An operational model