00634484

Component

http://onlinepubs.trb.org...trr/1993/1383/1383-004.pdf

https://scholar.google.co...lton&publication_year=1993

Numerous queueing models are available that are appropriate for modeling wharf crane operations. When used correctly, the models provide an excellent way to assess the efficiency of container port operations. The majority of queueing theory applications assume that exponential distributions adequately describe the service and arrival processes, primarily because of the tractable solutions that result. Regardless of the assumption's simplifying effect, its suitability should be questioned before applying it to any analysis. The appropriateness of the exponential distribution for analyzing service, interarrival, and backcycle processes at container port wharf cranes is determined, and suitable distributions should the exponential distribution prove inappropriate are investigated. Interarrival and service times were recorded for all tractors servicing wharf cranes for a total of more than 30 hr at two United States ports. The formation of the data set used for the analysis, the testing procedure used to determine the most appropriate distribution, and the results of the analysis are described. It is shown that service times, interarrival times, and backcycle times used in queueing analysis should not always be modeled as exponential distributions, contrary to popular belief.

This paper appears in Transportation Research Record No. 1383, Issues in Marine and Intermodal Transportation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01405146

English

p. 24-30

1993

Transportation Research Record

0309054532

References (4) ; Tables (6)

Case studies; Container terminals; Exponential distributions; Port operations; Queuing theory; Service time

Freight Transportation; Highways; Marine Transportation; Planning and Forecasting

TRIS, TRB

Aug 17 1993 12:00AM

• ASSESSING HAZARDOUS MATERIALS EMERGENCY RESPONSE CAPABILITY: METHODOLOGICAL DEVELOPMENT AND APPLICATION
• CANADA'S NATIONAL CAPITAL REGION GOODS MOVEMENT STUDY
• ESTIMATING ANNUAL WATERWAY TONNAGE FROM LOCK DATA: METHODOLOGY
• INTERMODAL CONTAINER PORTS: APPLICATION OF AUTOMATIC VEHICLE CLASSIFICATION SYSTEM FOR COLLECTING TRIP GENERATION DATA
• METHODOLOGY FOR PLANNING EFFICIENT INVESTMENTS ON INLAND WATERWAYS
• MULTIMODAL TRANSPORTATION AND IMPACTS OF POLICY: GRAIN TRANSPORTATION MODEL
• PASSENGER-ONLY FERRY SERVICE BETWEEN VASHON ISLAND AND SEATTLE, WASHINGTON
• RISK UNCERTAINTY IN THE TRANSPORT OF HAZARDOUS MATERIALS
• TRUCK TRAVEL IN THE SAN FRANCISCO BAY AREA
• USING MARGINAL COSTS TO EVALUATE DRAYAGE RATES IN RAIL-TRUCK INTERMODAL SERVICE