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Extra info for Web-Age Information Management: 17th International Conference, WAIM 2016, Nanchang, China, June 3-5, 2016, Proceedings, Part II

Example text

Location table contains many attributes like grid id, grid position, grid AQD and user position, which is the form of ([i, j] , [ Xs , Ys , Xt , Yt ] , Dij , [uk , xk , yk ]). Grid position denotes coordinates of points of left-bottom and right-up. User position denotes a list of k positions which have the most queries. Fig. 4. Hierarchical structure The hierarchical algorithm is as Algorithm 1. First, through the mapping methods, the algorithm maps the real location into a grid, matchs grid id where the real user located in with grid id in location table, and obtains AQD Du which the grid id is matchable (Line 1).

361– 372 (2014) 3. : Detecting anomalies in dynamic rating data: a robust probabilistic model for rating evolution. In: KDD 2014, pp. 841–850 (2014) 4. : Shilling attacks against recommender systems: a comprehensive survey. Artif. Intell. Rev. pp. 1–33 (2012) 5. : Unsupervised shilling detection for collaborative filtering. Assoc. Adv. Artif. Intell. (2007) 6. : Lies and propaganda: detecting spam users in collaborative filtering. In: IUI 2007: Proceedings of the 12th International Conference on Intelligent User Interfaces, pp.

Before outsourcing, the owner represents the images as compact binary codes through aforementioned BPBC. Then the owner generates the searchable secure index using the BuildIndex algorithm. We first perform a pseudo-random permutation π(·) on p. After that, the permutated vector p¯ is extended into p˜ that is (c + r)-bit. By choosing t out of r dummy dimensions, the corresponding entries in p˜ are set to 1. And p˜ is further split into two ddimensional points p˜a and p˜b in such a way: for j = 1 to c + r, if the j-th bit of S is 1, p˜a [j] and p˜b [j] are set to two random numbers so that their sum is equal to p˜[j], that is p˜[j] = p˜a [j] + p˜b [j]; if the j-th bit of S is 0, p˜a [j] and p˜b [j] are set to the same value as p˜[j], that is p˜[j] = p˜a [j] = p˜b [j].

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