Case study analysis of the impacts of electronic commerce on the strategic management of container shipping companies

Despite the prevalence of its use, very little is understood about the role of electronic commerce (EC) practice on the strategic management of container shipping companies. Four case studies were undertaken to assess the main uses, motivations, barriers and strategic relevance of EC in the container shipping industry between 1992 and 2002. The cases studies included one large, one medium and one small deep-sea container line, and one medium-sized feeder line. The research found that despite pressing technical and managerial barriers, the need to improve internal economies provided the most fertile grounds for EC use in 1992 and EC was seen as a tactical tool to achieve these goals. By 2002, customer-oriented motivations became critical to the increased relevance of EC and to its perception as a business necessity.     

The Wheel Shimmy Problem: Its Relationship to Wheel and Road Irregularities

The equations of motion are derived for a single wheel steerable pneumatic tire system. Included in this system are a built-in wheel wobble and wheel-tire irregularities which produce oscillation of the normal load. Special emphasis is placed on the dynamic characterization of the tire cornering force and aligning torque. The results show that the built-in wheel wobble causes a steady shimmy which is large when the wheel rotation frequency is close to the natural shimmy frequency. The results also show that a normal load oscillation which has a frequency approximately twice the natural shimmy frequency causes a decrease in shimmy stability.     

Anti-Skid Braking of a Tractor-Semitrailer Truck

This paper describes a study of anti-skid braking and the effects of such braking on the handling behavior and braking performance of a tractor-semitrailer truck. The truck, represented by a digital computer model having fourteen degrees of freedom, is taken to be in a cornering maneuver that involves braking and driver steering. Conventional braking or one of three types of anti-skid braking is used in the maneuver. The results show that the effects of anti-skid braking on the handling behavior and braking performance of the truck are beneficial. The results also show that the behavior of the wheels and the handling behavior and braking performance of the truck depend on the type of anti-skid braking used.