Introduction: Renal dynamic study is a well-established and popular test in routine practice of nuclear medicine. The test is non-invasive, rapid and unique in evaluation of the kidney function. In despite of its clinical values, the parameters derived from renogram are physiologically meaningless. That is due to the fact that renogram is not the true kidney function. From mathematical po...

This paper shows a scheme of urban transport management aimed at solving the externalities due to road trac. In this scheme both private and public transport modes are managed by a planning authority having control of some decision variables: road pricing, transit ticket prices, and the service characteristics of transit. The multimodal transport system is subject to some constraints: physical...

The paper set out to investigate the effectiveness of the removals in transit (RIT) system in facilitating trade. The study wanted to establish whether the Removals in Transit system currently being used in Zimbabwe is effective enough, that is whether acquittals of entries are being done in the system properly or fraudulently. A sample size of 200 Zimbabwe Revenue Authority (ZIMRA) employees a...

Passenger information is vital for developing a user-friendly public transportation system. Websites are rapidly gaining popularity for public transport information dissemination, particularly due to their anytime-anywhere availability and their suitability for the multimodal applications and multilingual interface. Internet-based Passenger Information Systems (PIS), therefore, have become comm...

Seamless integration of ride-sharing and public transit may offer fast, reliable, and affordable transfer to and from transit stations in suburban areas thereby enhancing mobility of residents. We investigate the potential benefits of such a system, as well as the ride-matching technology required to support it, by means of an extensive computational study.

We are exploring ways to capture the temporal and spatial dimensions of the use of public transit. Specifically, we are investigating how different land uses affect the spatial and temporal demand for public transit services. Spatially, the availability of new data collection technology in public transit allows us to examine transit demand at the individual stop level. Our hypothesis, however, ...

Users of mass transit systems such as those of buses and trains normally rely on accurate route maps, stop locations, and service schedules when traveling. If the route map, service schedule, or stop location has errors it can reduce the transit agency’s ridership. In this paper, the problem of deriving transit systems by mining raw GPS data is studied. Specifically, we propose and evaluate nov...

For public transit operators in the U.S., neither fare increases nor fare reductions have been successful in boosting revenues. A different kind of strategy is needed, one that can produce more revenue for transit operators than it costs. This article argues that deep discount group pass (DDGP) programs can accomplish this goal. DDGP programs provide groups of people with unlimited-ride transit...