Differential evolution (DE) is a population-based optimization algorithm. The members of population in DE are called parameter vectors. Due to more real-world optimization problems become increasingly complex. Algorithms with more ability and efficiency for searching potential solution are also increasing in demand. Thus, in this paper, an improved DE is proposed for solving large scale global ...

In this paper, a consistent pattern with the optimal coordinated design of PSS and SSSC controller to improve the damping of low frequency oscillations is shown. In this design, sensing and signal transmission time delays are considered as effectiveness parameters. The design problem has been considered an optimization problem and biogeography-based optimization (BBO) algorithm is used for sear...

This is the 8th year that IR group of Tsinghua University (THUIR) participates in TREC. This year we focus on Web track, which contains two tasks, namely ad hoc and diversity. On ad hoc task, we improved the efficiency of our distributed retrieval system TMiner to handle terabytes of Web data. Then three studies have been done, namely page quality estimation, ranking feature analysis, and model...

Due to the ability simultaneously interrogate multiple tags with a far operating distance, radio frequency identification (RFID) has been widely used in modern farms improve management efficiency. In smart farm applications, how quickly locate and search some specified items (e.g., animals) is critical problem, for which tag searching can be solve problem. While there are works on searching, th...

There are proposed method of acceleration of large string search in database of learning management system.

We present a linear-space data structure that maintains a dynamic set of n points with coordinates of real numbers on the plane to support orthogonal range counting, as well as insertions and deletions, in O(( lgn lg lgn )) time. This provides faster support for updates than previous results with the same bounds on space cost and query time. We also obtain two other new results by considering t...

Phrase browsing interfaces based on hierarchies of phrases extracted automatically from document collections offer a useful compromise between automatic full-text searching and manually-created subject indexes. The literature contains descriptions of such systems that many find compelling and persuasive. However, evaluation studies have either been anecdotal, or focused on objective measures of...

As cloud computing becomes prevalent, more and more sensitive data is being centralized into the cloud by users. To maintain the confidentiality of sensitive user data against untrusted servers, the data should be encrypted before they are uploaded. However, this raises a new challenge for performing search over the encrypted data efficiently. Although the existing searchable encryption schemes...