Urban Transportation Networks: Equilibrium Analysis With Mathematical Programming Methods

The relationship between investment in information technology (IT) and its effect on organizational performance continues to interest academics and practitioners. In many cases, due to the nature of the research design employed, this stream of research has been unable to identify the impact of individual technologies on organizational performance. This study posits that the driver of IT impact is not the investment in the technology, but the actual usage of the technology. This proposition is tested in a longitudinal setting of a healthcare system comprising eight hospitals.Monthly data for a three-year period on various financial and nonfinancial measures of hospital performance and technology usage were analyzed. The data analysis provides evidence for the technology usage-performance link after controlling for various external factors. Technology usage was positively and significantly associated with measures of hospital revenue and quality, and this effect occurred after time lags. The analysis was triangulated using three measures of technology usage. The general support for the principal proposition of this paper that "actual usage" may be a key variable in explaining the impact of technology on performance suggests that omission of this variable may be a missing link in IT payoff analyses.

http://gkmc.utah.edu/7910F/papers/loadPDF_objectIDValue%3D12736.pdf

Performance Impacts of Information Technology: Is Actual Usage the Missing Link?

Key features of one automated intelligent vehicle/highway system (IVHS) are outlined, it is shown how core driver decisions are improved, a basic IVHS control system architecture is proposed, and a design of some control subsystems is offered. Some experimental work is summarized. A system that promises a threefold increase in capacity is outlined, and a four-layer hierarchical control architecture that decomposes this problem into more manageable units is proposed. >

Smart cars on smart roads: problems of control

This survey reviews the forty-year history of research on transportation revenue management (also known as yield management). We cover developments in forecasting, overbooking, seat inventory control, and pricing, as they relate to revenue management, and suggest future research directions. The survey includes a glossary of revenue management terminology and a bibliography of over 190 references.

/pdf/revenue-management-research-overview-and-prospects-4c380nxyp4.pdf

Revenue Management: Research Overview and Prospects

With this article we use an alternative form of the discrete choice model to analyze the distribution of maritime shipments among US ports. We model the distribution as a function of the characteristics that describe each shipment and each port. We assume that vessel schedules are fixed in the short-term and examine the assignment to ports for exports of various commodity-types as a function of geographic location, port characteristics, and characteristics of vessel schedules. We find that the most significant characteristic of a port is its location. We show also how the market share predicted for a port can be expected to vary with each commodity-type and each carrier, and we show how the choice process varies for discretionary cargo.

A disaggregate analysis of port selection

Contents: Introduction; Demand Theory; Transportation Supply; Urban Passenger Travel Demand; Choice Analysis; Trip Distribution Analysis; Mode and Route Choice; Intercity Passenger Travel Demand; The Demand for Air Transportation; and Commodity Transport Demand.

Transportation demand analysis

In this paper are presented the results of a multinomial logit model used to explain the selection of a port for each shipment exported from the US in December 1999. The model is estimated for combined shipments, and one model is estimated for each of four commodity types (bulk, foods, fabrics, manufactured). Results are compared across commodities to find the significance of the distance in either direction, the frequency of sailings, and the average size of vessels sailing along a route. Results of the estimation do not match those that would be expected. Potential reasons are given for such variations, along with numerous methods by which the modelling could be improved. Methods for improvement suggested include structuring of the model to represent more accurately the competitive scenario of each port, constraining the choice set for each shipments from characteristics of the carrier, and the commodity.

A disaggregate analysis of factors influencing port selection

Airline hubbing : some implications for airport economics

This paper examines the full costs, defined as the sum of private and social costs, of a high-speed rail system proposed for a corridor connecting Los Angeles and San Francisco in California. The full costs include infrastructure, fleet capital and operating expenses, the time users spend on the system, and the social costs of externalities, such as noise, pollution, and accidents. Comparing these full costs to those of other competing modes contributes to the evaluation of the feasibility of high-speed rail in the corridor. The paper concludes that high-speed rail is significantly more costly than expanding existing air service, and marginally more expensive than auto travel. This suggests that high-speed rail is better positioned to serve shorter distance markets where it competes with auto travel than longer distance markets where it substitutes for air.

Adib Kanafani

Papers

A disaggregate analysis of port selection

Transportation demand analysis

A disaggregate analysis of factors influencing port selection

Airline hubbing : some implications for airport economics

The Full Cost of High-Speed Rail: An Engineering Approach