The inverted-pendulum system is a favorite example system and lecture demonstration of students and educators in physics, dynamics, and control. This system is a simple and valuable laboratory representation of an unstable mechanical system. This paper traces the early history of the inverted-pendulum system, and also compares several of the early treatments from the literature between 1960 and...

This paper focuses on the important problem of semanticaware search in textual (structured, semi-structured, NoSQL) databases. This problem has emerged as a required extension of the standard containment keyword based query to meet user needs in textual databases and IR applications. We provide here a new approach, called SemIndex, that extends the standard inverted index by constructing a tigh...

We address the problem of positional indexing in the natural language domain. The positional inverted index contains the information of the word positions. Thus, it is able to recover the original text file, which implies that it is not necessary to store the original file. Our Positional Inverted Self-Index (PISI) stores the word position gaps encoded by variable byte code. Inverted lists of s...

There has been a s ubstantial amount of research on high performance inverted index because most web and search engines use an inverted index to execute queries. Documents are normally stored as lists of words, but inverted indexes invert this by storing for each word the list of documents that the word appears in, hence the name “inverted index”. This paper presents the crucial research findin...

A design of inverted index based on web document comprehending is induced and the algorithm is presented by combining the inverted index and the web documents understanding technology. Experimental results show that less time is cost than the traditional inverted index to query in the documents with the same size.

A recent note by Merrilees [15] concludes that Divisia index numbers as employed in our studies of productivity change [ l l , 141 represent a new perspective on the analysis of productivity. Merrilees concludes further that Divisia index numbers are appropriate for the explanation of productivity change, but that they should not be used for measurement. In this note we examine and reject both ...

Today, two classes of indexing methods enjoying wide applicability are the Inverted Index and the Superimposed Coding based Signature File (SC-SF). The former is most efficient in query processing but utilizes extra storage of size comparable to that of the textbase, whereas the latter is most efficient in storage utilization. The present study builds upon the results obtained in previous resea...

Reorganising the index of a search engine based on access frequencies can significantly reduce query evaluation time while maintaining search effectiveness. In this paper we extend access-ordering and introduce a variant index organisation technique that we label accessreordering. We show that by access-reordering an inverted index, query evaluation time can be reduced by as much as 62% over th...