It is widely recognized that production rules in database systems can be used to automatically maintain derived data such as views. However, writing a correct set of rules for eeciently maintaining a given view can be a dii-cult and ad-hoc process. We provide a facility whereby a user deenes a view as an SQL select expression, from which the system automatically derives set-oriented production ...

Kent içi toplu ulaşım gelişmekte olan ülkelerde genel olarak lastik tekerlekli sistemler üzerinden yürütülmektedir. Lastik kent operasyonlarında en temel modeller, özkaynak modeli ve belirli bileşenlerin piyasadan satın alındığı modellerdir. Türkiye’de hizmeti sağlama görev, yetki sorumluluğu belediyelerdedir. Belediyeler, sistemlerin işletilmesi konusunda artan personel maliyetleri, yükselen f...

We develop a methodology for analyzing the performance and stability of a server that maintains a multilevel data structure to service a set of access operations for (key,value) records. A subset of the operations executed by the server (e.g., insert and delete) require the multilevel data structure be reorganized so that the server can execute all subsequent requests eeciently. We study how of...

In this paper, the authors identify key entities and relationships in the operational management of metadata catalogs that describe digital collections, and they draft a data model to support the administration of metadata maintenance for collections. Further, they consider this proposed model in light of other data schemes to which it relates and discuss the implications of the model for libra...

Intelligent question-answering (QA) systems have witnessed increased interest in recent years, particularly their ability to facilitate information access, data interpretation or decision support. The wind energy sector is one of the most promising sources renewable energy, yet turbines regularly suffer from failures and operational inconsistencies, leading downtimes significant maintenance cos...

New wind turbine technologies and designs are being explored in order to reduce the cost of energy from offshore farms. Two potential routes a lower X- Rotor Concept (XRC) Multi-Rotor System (MRS) turbines. A key saving for both Novel concepts included this paper is operation maintenance (O&M) costs savings. The major component replacement conventional horizontal axis, XRC MRS turbines examined...

In the last few decades, several initiatives and approaches are set up to support maintenance procedures for railway industry in adopting principles of Industry 4.0. Contextualized technologies such as Augmented Reality (AR) overlay can integrate virtual information on physical objects improve decision-making action-taking processes. Operators work a dynamic working environment requiring both h...