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Manufacturing Systems: Modeling and Simulation
Published in Naim A. Kheir, Systems Modeling and Computer Simulation, 2018
The team should develop a detailed functional specification for the required elements of the simulation. The functional specification completely defines all inputs to and outputs from the simulation, describes each of the simulation components, and defines all control logic for the model. The functional specification is intended to eliminate any confusion between the project team and the end customers about expectations and deliverables. Included in the functional specification are the system description, project scope, objectives, data and related accuracy estimates, and control logic. It would be ideal to have the functional specification fixed and agreed upon before beginning the project, but realistically, the document will evolve during the project as details and improved data and understanding become available.
Temporal stability of shipment size decisions related to choice of truck type
Published in Transportmetrica A: Transport Science, 2023
Abel Kebede Reda, Jose Holguin-Veras, Lori Tavasszy, Girma Gebresenbet, David Ljungberg
where d is the trip distance (km); δ = (δ1, δ2, … δn) is a vector of binary variables representing commodity classes, type of activities at the trip ends, trip characteristics (whether it starts/ends at a port location), the specialist body trucks required to transport the shipments and data collection year. The binary variable representing the data collection year has an essential implication of whether time-dependent patterns in shipment size decisions will be detected. The η is an error term, assumed to be normally distributed with . The functional specification provides consistent representation of the problem. The marginal contribution of the binary variables to the shipment size is represented with the interaction terms (i.e. between the trip distance and the binary variables).