Internet forums are important platforms where users can request and exchange information with others. For example, the Trip Advisor Travel Board is a place where people can ask and share travel tips. Due to the richness of information in forums, researchers are increasingly interested in mining knowledge from them. Tried to mine business intelligence from […]
MERGING AND DISTANCE BROWSING
The information retrieval R-tree (IR2- tree) which is the state of the art for answering the nearest neighbor queries defined explains an alternative solution based on the inverted index. the IR2-tree combines the Rtree with signature files. Next, we will review what is a signature file before explaining the details of IR2-trees. Our discussion assumes […]
THE SPATIAL INVERTED INDEX
A spatial database manages multidimensional objects (such as points, rectangles, etc.), and provides fast access to those objects based on different selection criteria. The importance of spatial databases is reflected by the convenience of modeling entities of reality in a geometric manner. For example, locations of restaurants, hotels, hospitals and so on are often represented […]
System Adversary Model and Preliminaries
The basic idea of blind vector transformation protocol is allowing two untrusted parties to transform two vectors into the blind ones by following a series of private and identical steps, e.g., adding a random vector, shuffling in the same order. Since the transformation follows the same step, the matching results (e.g. the number of matched […]
Proposed Privacy Preserving and Fairness Aware Friend Matching Protocol
Mobile online social networks have gained tremendous momentum in the recent years due to both the wide proliferation of mobile devices such as smartphones and tablets as well as the ubiquitous availability of network services. Moreover, the positioning technologies such as GPS, and Wireless localization techniques for mobile devices have made both the generation and […]
Sophisticated Attack On Queuing Mechanisms
Queueing mechanisms are major mechanisms used in variety of computer and communications systems. Their major objective is to control the system operation when it is under heavy traffic load in order to provide good and fair performance to the various users. Since these system are responsible for the resource allocation and taking care of the […]
Sybil defender Is Efficient and Scalable To Large Social Networks
One promising way to defend against sybil attacks in social networks is to leverage the social network topologies. Decentralized algorithms, SybilGuard and SybilLimit to determine whether a suspect node is Sybil or not. SybilGuard and SybilLimit both rely on the assumption that social networks are fast mixing (explained later), and the number of attack edges […]
A sybil defense Mechanism that leverages the network topologies
Distributed systems are vulnerable to sybil attacks , in which an adversary creates many bogus identities, called Sybil identities, and compromises the running of the system or pollutes the system with fake information. The sybil identities can “suppress” the honest identities in a variety of tasks, including online content ranking, DHT routing, file sharing, reputation […]
Supporting real attribute values with small precisions
we have been witnessing much interest in uncertain data management in many application areas such as data cleaning , sensor networks , information extraction , etc. Much research effort has been devoted to several aspects of uncertain data management, including data modeling , skyline queries, top-k queries, nearest neighbor search , spatial queries , XML […]
Dynamic Programming Algorithm for Attributelevel Model
Aggregate (or aggr for short) queries, in particular SUM queries, are crucial for many applications that need to deal with uncertain data . Let us give two motivating examples from the medical and environmental domains. Effect of the number of uncertain tuples using the synthetic data, the response time of the three algorithms vs. the […]
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