A vector autoregressive model was developed for a sample of container carrier time charter rates. Although the series of time charter rates are themselves found non-stationary, thus precluding the use of many modeling...A vector autoregressive model was developed for a sample of container carrier time charter rates. Although the series of time charter rates are themselves found non-stationary, thus precluding the use of many modeling methodologies, evidence provided by co-integration tests points to the existence of stable long-term relationships between the series. An assessment of the forecasts derived from the model suggests that the spec-ification of these long-term relationships does not improve the accuracy of long-term forecasts. These results are interpreted as a corroboration of the efficient market hypothesis.展开更多
The mega-size containership viability was analyzed by considering different service networks for different ship sizes:hub-and-spoke and multi-port-calling (MPC) networks for mega-size containerships and conventional s...The mega-size containership viability was analyzed by considering different service networks for different ship sizes:hub-and-spoke and multi-port-calling (MPC) networks for mega-size containerships and conventional ships.A model was proposed,which quantifies the economies of scale in operating large con- tainerships and constructs models for ship routing under different service networks.A sensitivity analysis was conducted to test the effect of feeder costs and the results analyzed to determine optimal containership size with respect to different operational scenarios.Throughout model applications for Asia-Europe and Asia-North America trades,the mega-size containership is competitive in all scenarios for Asia-Europe,while it is viable for Asia-North America only when the feeder costs are low.展开更多
Ship and offshore structure often work in very severe environment.Therefore routine inspection and maintenance are essential to keep ship structure and equipment in good state,and can decrease the possibility of sea p...Ship and offshore structure often work in very severe environment.Therefore routine inspection and maintenance are essential to keep ship structure and equipment in good state,and can decrease the possibility of sea pollution and safety problems.Besides that,the activity of inspection and maintenance is also directly connected with cost control and condition assessment.Current inspection is still mainly based on paper and pen,so it is rather time-consuming for transferring inspection data from paper to computer system,and more diffcult to make calculation based on the inspection records.In this paper,the concept of information integration model and inspection support system using mobile device is introduced.The structuralized data in the information integration model offer much convenience to data transferring.The inspection support system consists of one headquarter management subsystem and one inspector handling subsystem.A mechanism of data exchange between the two subsystems is developed based on standard inspection workflow.The headquarter subsystem works on computer,and the inspector subsystem is mobile application instead of paper and pen.Versatile tests and platform experiments are carried out to demonstrate and confirm the feasibility and validity.展开更多
文摘A vector autoregressive model was developed for a sample of container carrier time charter rates. Although the series of time charter rates are themselves found non-stationary, thus precluding the use of many modeling methodologies, evidence provided by co-integration tests points to the existence of stable long-term relationships between the series. An assessment of the forecasts derived from the model suggests that the spec-ification of these long-term relationships does not improve the accuracy of long-term forecasts. These results are interpreted as a corroboration of the efficient market hypothesis.
文摘The mega-size containership viability was analyzed by considering different service networks for different ship sizes:hub-and-spoke and multi-port-calling (MPC) networks for mega-size containerships and conventional ships.A model was proposed,which quantifies the economies of scale in operating large con- tainerships and constructs models for ship routing under different service networks.A sensitivity analysis was conducted to test the effect of feeder costs and the results analyzed to determine optimal containership size with respect to different operational scenarios.Throughout model applications for Asia-Europe and Asia-North America trades,the mega-size containership is competitive in all scenarios for Asia-Europe,while it is viable for Asia-North America only when the feeder costs are low.
基金the Open Fund of State Key Laboratory of Structural Analysis for Industrial Equipment(No.S08201)
文摘Ship and offshore structure often work in very severe environment.Therefore routine inspection and maintenance are essential to keep ship structure and equipment in good state,and can decrease the possibility of sea pollution and safety problems.Besides that,the activity of inspection and maintenance is also directly connected with cost control and condition assessment.Current inspection is still mainly based on paper and pen,so it is rather time-consuming for transferring inspection data from paper to computer system,and more diffcult to make calculation based on the inspection records.In this paper,the concept of information integration model and inspection support system using mobile device is introduced.The structuralized data in the information integration model offer much convenience to data transferring.The inspection support system consists of one headquarter management subsystem and one inspector handling subsystem.A mechanism of data exchange between the two subsystems is developed based on standard inspection workflow.The headquarter subsystem works on computer,and the inspector subsystem is mobile application instead of paper and pen.Versatile tests and platform experiments are carried out to demonstrate and confirm the feasibility and validity.
