Beyond OAIS : towards a reliable and consistent digital preservation implementation framework

Current work in digital preservation (DP) is dominated by the "Open Archival Information System" (OAIS) reference framework specified by the international standard ISO 14721:2003. This is a useful aid to understanding the concepts, main functional components and the basic data flows within a DP system, but does not give specific guidance on implementation-level issues. In this paper we suggest that there is a need for a reference architecture which goes beyond OAIS to address such implementationlevel issues - to specify minimum requirements in respect of the policies, processes, and metadata required to measure and validate repository trustworthiness in respect of the authenticity, integrity, renderability, meaning, and retrievability of the digital materials preserved. The suggestion is not that a particular way of implementing OAIS be specified, but, rather that general guidelines on implementation are required if the term 'OAIS-compliant' is to be meaningful in the sense of giving an assurance of attaining and maintaining an operationally adequate or better level of long-term reliability, consistency, and crosscompatibility in implemented DP systems that is measurable, verifiable, manageable, and (as far as possible) futureproofed

Proposals to introduce regulations for mandatory training for governors and clerks to the governing body and for local authorities to provide a clerking service for governing bodies

"This consultation document outlines the proposals to introduce regulations to make specific governor training and clerk to the governing body training mandatory and to set out the scope and content of that training. It also outlines the proposals to introduce a requirement in regulations that all local authorities in Wales must provide a clerking service for governing bodies if requested" - inside front cover

Quantum measurement in a family of hidden-variable theories

The measurement process for hidden-configuration formulations of quantum mechanics is analysed. It is shown how a satisfactory description of quantum measurement can be given in this framework. The unified treatment of hidden-configuration theories, including Bohmian mechanics and Nelson's stochastic mechanics, helps in understanding the true reasons why the problem of quantum measurement can succesfully be solved within such theories.Comment: 16 pages, LaTeX; all special macros are included in the file; a figure is there, but it is processed by LaTe

Process performance measurement support : a critical analysis

Design development processes, within engineering disciplines, lack the necessary mechanisms in identifying the specific areas where improved design development performance may be obtained. In addition, they lack the means to consider and align the goals and respective performance levels of related development activities with an organisation's overall goals and performance levels. Current research in organisational performance behaviour, formalised through performance frameworks and methodologies, has attempted to identify and focus upon those critical factors which impinge upon a wealth creation system while attempting to, simultaneously, remain representative of organisational functions, processes, people, decisions and goals. Effective process improvements remain conditional upon: the ability to measure the potential performance gains which may result from an improvement initiative; the ability to understand existing process dynamics and in turn understand the subsequent impact of some change to a system/process; and, the ability to identify potential areas for improvement. The objective of this paper is to discuss some of the management techniques, which are purported to support various process performance concerns and perspectives, and present the major factors that remain unsupported in identifying, measuring and understanding design process performance

Efficient Constellation-Based Map-Merging for Semantic SLAM

Data association in SLAM is fundamentally challenging, and handling ambiguity well is crucial to achieve robust operation in real-world environments. When ambiguous measurements arise, conservatism often mandates that the measurement is discarded or a new landmark is initialized rather than risking an incorrect association. To address the inevitable `duplicate' landmarks that arise, we present an efficient map-merging framework to detect duplicate constellations of landmarks, providing a high-confidence loop-closure mechanism well-suited for object-level SLAM. This approach uses an incrementally-computable approximation of landmark uncertainty that only depends on local information in the SLAM graph, avoiding expensive recovery of the full system covariance matrix. This enables a search based on geometric consistency (GC) (rather than full joint compatibility (JC)) that inexpensively reduces the search space to a handful of `best' hypotheses. Furthermore, we reformulate the commonly-used interpretation tree to allow for more efficient integration of clique-based pairwise compatibility, accelerating the branch-and-bound max-cardinality search. Our method is demonstrated to match the performance of full JC methods at significantly-reduced computational cost, facilitating robust object-based loop-closure over large SLAM problems.Comment: Accepted to IEEE International Conference on Robotics and Automation (ICRA) 201