Dynamic Management of Equi-Join Results for Multi-Keyword Searches

Cost Based Multi-Way Equi-Join Optimization in MapReduce

MapReduce is a prominent programming model above shared nothing architecture for processing big data with a parallel, distributed algorithm on a cluster. Join is an important operation is very inefficient in MapReduce. In this work, a time cost based evolution model is proposed for multi-way join by considering the time cost calculation. A multi-way join consists of start pattern joins and chai...

Keyword Join: Realizing Keyword Search for Information Integration

Information integration has been widely addressed over the last several decades. However, it is far from solved due to the complexity of resolving schema and data heterogeneities. In this paper, we propose out attempt to alleviate such difficulty by realizing keyword search functionality for integrating information from heterogeneous databases. Our solution does not require predefined global sc...

Threshold Privacy Preserving Keyword Searches

diagnostic and developmental potentials of dynamic assessment for writing skill

این پایان نامه بدنبال بررسی کاربرد ارزیابی مستمر در یک محیط یادگیری زبان دوم از طریق طرح چهار سوال تحقیق زیر بود: (1) درک توانایی های فراگیران زمانیکه که از طریق برآورد عملکرد مستقل آنها امکان پذیر نباشد اما در طول جلسات ارزیابی مستمر مشخص شوند; (2) امکان تقویت توانایی های فراگیران از طریق ارزیابی مستمر; (3) سودمندی ارزیابی مستمر در هدایت آموزش فردی به سمتی که به منطقه ی تقریبی رشد افراد حساس ا...

Preliminary results on multi-body dynamic simulation of a new test rig for wheel-rail contact

The ability to perform rolling contact fatigue (RCF) experiments in wheel–rail material is provided by a new small–scale test rig, manifesting the actual dynamic behaviour of the railway system. In this paper, a multi-body dynamics (MBD) model is proposed, simulating the vibration behaviour of the prescribed rig. The new testing facility is modelled using a three-dimensional model of the vehicl...