This paper presents a formal framework for implementing a query refinement method. The method uses general principles of facet analysis. Two key notions are advanced and discussed: diversity and focus. Diversity refers to the information needs of a querying user; it is captured by the notion of ‘facet’. A focus refers to how diversity is captured from the documents as organized by the user; it ...

This paper describes a new class of adaptive mesh surface for terrain analysis. The novelty of the contribution resides in the control of the mesh. We use a variance-bias criterion to select the optimal areas for the triangular facets of the mesh.In this way the mesh adapts itself to o er the best tradeo between increasing the facet area to minimise the noise variance and deccreasing the facet ...

background and aims:  using methods such as pulsed radiofrequency (prf) and nerve blocks are among the methods used in pain clinics to treat facet-originating low back pain. this study compares two methods of pulsed radiofrequency and facet joint block (fjb)regarding pain recovery and improving disability of patients suffering from facet-originating low back pain. material and method: 50 patien...

Models are the central assets in model-driven engineering (MDE), as they actively used all phases of software development. built using metamodel-based languages, and so objects models typed by a metamodel class. This typing is static, established at creation time, cannot be changed later. Therefore, MDE closed fixed with respect to class conform to, fields have, well-formedness constraints must...

BACKGROUND Many decompression procedures involve complete or partial facetectomy. Spinal fusion usually stabilizes the motion segment after complete facetectomies. However, problems with fusion, such as adjacent-level degeneration, have increased interest in motion- preservation technologies. Facet arthroplasty may become an important posterior motion-preservation device, but its biomechanical ...

BACKGROUND AND PURPOSE Transforaminal corticosteroid injections can be performed in the management of cervical radiculopathy but carry the risk of catastrophic complications. This study compares the efficacy of transforaminal and facet corticosteroid injections at 4 weeks' follow-up. MATERIALS AND METHODS We randomly assigned 56 subjects to receive CT-guided transforaminal (15 men, 13 women; ...

BACKGROUND Lumbar facet joints are a well recognized source of low back pain and referred pain in the lower extremity in patients with chronic low back pain. Conventional clinical features and other non-invasive diagnostic modalities are unreliable in diagnosing lumbar zygapophysial joint pain. Controlled diagnostic studies have shown the prevalence of lumbar facet joint pain in 27% to 40% of t...

BACKGROUND The role of injections of therapeutic substances into the back as treatment for low back pain is unclear. Facet joint injections are widely used despite the absence of evidence of sustained benefit. We hypothesise that facet joint injections might facilitate engagement with physiotherapist-led, best usual care (a combined physical and psychological programme) and is a clinically and ...