Predicate encryption is an advanced form of public-key encryption that yield high flexibility in terms of access control. In the literature, many predicate encryption schemes have been proposed such as fuzzy-IBE, KP-ABE, CP-ABE, (doubly) spatial encryption (DSE), and ABE for arithmetic span programs. In this paper, we study relations among them and show that some of them are in fact equivalent ...

The fracture field and permeability distribution model of comprehensive working face goaf was integrated upon the theoretical examination to investigate law gas migration accumulation characteristics, this has been applied mathematical in goaf. ANSYS FLUENT numerical simulation software used obtain characteristics its influencing factors analyze applicability solving features proliferation usin...

The recovery of top coal in the caving face directly impacts efficiency mining resources. geological conditions and parameters are well known to be significant influences on coal. This study focused 9-301 working face, which is located a thick seam with large dip angle. seam’s angle, direction, mode interval were analyzed using PFC2D simulation. Field trials also carried out. results numerical ...

Despite the recent developments in structural health monitoring, there remain great challenges for accurately, conveniently, and economically assessing the in-service performance of the main cables for long-span suspension bridges. A long-term structural health monitoring technique is developed to measure the tension force with a conventional sensing technology and further provide the in-servic...

Thick coal seam no. 3, block V, Lupeni mine was mined by longwall top caving (LTCC). After the mining, ground surface underwent continuous subsidence, but since 2008, three sinkholes have appeared on with important dimensions, atypical for geo-mining conditions in this basin. This article is a synthesis of study meant to decipher geo-mechanical phenomenon that led emergence these and highlighti...

Fragmentation analysis is an essential part of the optimization process in any mining operation. The costs loading, hauling, and crushing rock are strongly influenced by size distribution blasted rock. Several direct indirect methods used to analyse or predict fragmentation, but none entirely applicable fragmentation assessment sublevel caving mines, mainly because limitations imposed undergrou...

IMPORTANCE The Stroke Prognostication using Age and the NIH Stroke Scale index, created by combining age in years plus a National Institutes of Health (NIH) Stroke Scale score of 100 or higher (and hereafter referred to as the SPAN-100 index), is a simple risk score for estimating clinical outcomes for patients with acute ischemic stroke (AIS). The association between this index and response to...