| Author | Tzen, Ya-juei Jeffrey |
| Call Number | AIT Diss. no. IE-88-01 |
| Subject(s) | Warehouses--Data processing
|
| Note | A Dissertation Submitted in Partial Fulfillment of the
Requirements for the Degree of Doctor o f Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. IE-88-01 |
| Abstract | Storage and retrieval policies for unitload, miniload and
person - on- board automated storage and retrieval systems are
studied. Existing policies are reappraised and new policies
developed.
In the case of a single command unitload system, differences
in space utilization arc shown to be crucial for judging storage
policies . The turnover- based storage policy , claimed to be
optimal in the literature , can be significantly improved using a
class design methodology based on a dynamic programming approach.
A reduction of more t h an 2 0 % in travel time ca n be ac hi eve d by
the props d approach wit h an increment of less t h a n 5% in
inventory cost.
An effective s l:orage policy and an efficient interleaving
rule are essential f or operating a dual command unitload system.
The importance of space utilities in designing a storage policy
under dual command mode is verified. Interleaving under dedicated
Storage is formulated as a minimum cost flow problem. Efficient
heuristics are recommended for interleaving under randon1ized and
class- based storage .
Operational problems of the mini load and person· on - board
systems are analyzed and shown to be similar . Principles and
algorithms are provided for locating it ems in the mini load and
person- on - board systems . Some of these principles and algorithms
are tested using a simulation study and a real life case study.
It become::: clear that., in comparison with a randomized policy, a
combination of efficient retrieval and storage can reduce up to
80% of the picking machine travel time in a person- on- board
system. |
| Year | 1988 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. IE-88-01 |
| Type | Dissertation |
| School | School of Engineering and Technology |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Industrial Engineering (IE) |
| Chairperson(s) | Oudheusden, Dirk L. van
; |
| Examination Committee(s) | Awate, Prakash G. ;Clarke Harry R. ;Fujiwara, Okitsugu ;Tabucanon, Mario T. ;Vilas Wuwongse ;Kusiak, Andrew ; |
| Scholarship Donor(s) | The Government of Japan ; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1988 |