Abstract Unattended Workflow Interactions

Kulzhabayev, Alibek Abstract Unattended Workflow Interactions., 2012 Master thesis thesis, Albert-Ludwigs University of Freiburg. [Thesis]

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English abstract

Recent studies in the domain of digital preservation have demonstrated the principle feasibility of the migration-by-emulation approach. The migration-by-emulation approach is a method aimed to recreate original environments of the obsolete digital objects and using such environments, to automatically convert large amounts of digital artifacts, from obsolete formats into up-to-date formats. However, there are some issues hindering the creation of fast and reliable migration workflows. We studied a large number of migration workflows, and we provide an abstract description of the migration workflow based on that study. In such a description the mechanism to automatically handle unsuccessful migration workflows is also provided. Since we consider unattended migrations of a numerous digital objects, an approach of an execution of the migration worfklow for each digital object that is being migrated is not time-efficient. The abstract description of the migration workflow provided in this thesis, describes the process to repeat certain part of the migration workflow, according to the number of digital objects to be migrated. That allows to migrate large number of digital objects within one migration worfklow execution, which would increase the speed of such an execution. Moreover, we implemented a feature to create stages, which in this case serve as identifiers of the mentioned repeatable part of the migration workflow. By using the abstract description of the migration workflow and the feature to create stages, a user can choose or rearrange certain parts of the multi-format migration workflow, allowing the user to select the output formats needed. Such a workflow migrates a digital object from one format to several different ones. In this thesis, hindrances to create fast and reliable migration workflows are analyzed, and methods to optimize them are designed and implemented. About 3,35 times execution speed acceleration on 50 sample digital objects of such optimized migration workflows is observed in comparison with the ones that were created without our optimization method.

Item type:	Thesis (UNSPECIFIED)
Keywords:	Digital preservation, abstract, format migration, migration workflow, interactions, unattended migration, reliability
Subjects:	L. Information technology and library technology > LZ. None of these, but in this section.
Depositing user:	Alibek Kulzhabayev
Date deposited:	04 Apr 2012
Last modified:	02 Oct 2014 12:21
URI:	http://hdl.handle.net/10760/16791

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