Q2. What are the future works mentioned in the paper "A survey of literature on automated storage and retrieval systems" ?
Except for those general issues, further detailed research can also be advised for each of the following issues. A further digression on the over—automated warehouse: some evidence.
Q3. What are the common heuristics used in cluster analysis?
As common in cluster analysis, both attribute vectors related to storage locations of an order and similarity measures, based on, for example, the boundaries of the area in which the crane needs to travel to reach all locations of an order, are used in formulating heuristics.
Q4. What methods have been proposed in the literature to deal with one or more design issues?
In order to deal with one or more design issues for AS/RSs, methods ranging from simulation, analytical models, artificial intelligent approaches (e.g., Knapp and Wang, 1992; Chincholkar et al., 1994; Hsieh et al., 1998) to experimental approaches (e.g., Lim et al., 1996) have been proposed in the literature.
Q5. What are the common types of cycles to be addressed?
For the sequencing problem of unit load AS/RSs, the two common types of cycles to be addressed are single command and dual command cycles (see also Section 3).
Q6. What are the drawbacks of this dynamic approach?
Important drawbacks of this dynamic approach are the facts that LP solution techniques need to be implemented in the AS/RS control system and that computation times may be too high to be of practical value.
Q7. What other approaches to find solutions to the dynamic sequencing problem?
XXX INSERT TABLE 7 XXXOther approaches to find solutions to the sequencing problem include neural networks (e.g., Wan and Yih, 1997), expert systems (e.g., Linn and Wysk, 1990a and 1990b), artificial intelligence (e.g., Seidmann, 1988), genetic algorithms (e.g., Krishnaiah Chetty et al., 2003) and the Taguchi method (e.g., Lim et al., 1996).
Q8. What is the only paper discussing exclusively AS/RSs?
To their knowledge, Sarker and Babu (1995) is the only paper discussing exclusively AS/RSs, however, this paper only reviews some design aspects of AS/RSs while focussing on travel time models.
Q9. What are the travel time models for miniload AS/RSs?
it can be concluded that travel time models for both square-in-time and rectangular racks have been developed for unit-load AS/RSs operating under most common storage assignment policies and two sequencing heuristics derived from practice.