this paper aims at determining isfahan provincial industries orientation as well as relating the comparative advantage indexes and their changes with the province’s industrial characteristics. therefore, applying “factor analysis”, “principal components analysis” and “numerical taxonomy analysis” methods, the paper calculates the determining indexes of the province’s industrial development and ...

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background: groundwater nitrate pollution is an important environmental problem in water resources management. in this regard, specific measures aiming at prevention of water pollution will be helpful to managers and decision-makers. identification of aquifers’ vulnerable areas and determination of groundwater protection zones using most widely used models, such as drastic and cd, are one of th...

Index data structures, such as B trees and hash tables, are commonly used in database implementations. A database implementor typically works with a high-level view of indexes as mappings from keys to values. Using this high-level view, he is able to build up complex abstractions such as transactions, without needing to know exactly how indexes work ‘under the hood’. This high-level intuition b...

Index data structures such as B+ trees and hash tables are used widely as the core of databases andfile systems. In a world where concurrent systems are common as servers and largely increasing aspersonal computers, we need a way to make sure concurrent implementations do not contain bugs.We use the fact that multiple implementations share a common high-level specification and use<l...

Most operations of the relational algebra or SQL require a sorted stream of tuples for efficient processing. Therefore, processing complex relational queries relies on efficient access to a table in some sort order. In principle, indexes could be used, but they are superior to a full table scan only, if the result set is sufficiently restricted in the index attribute. In this paper we present t...

Since 1981, when Lamport introduced the remote user authentication scheme using table, a plenty of schemes had been proposed with table and without table using. Recently Das, Saxena and Gulati have proposed A dynamic ID-based remote user authentication scheme. They claimed that their scheme is secure against ID-theft, and can resist the reply attacks, forgery attacks, and insider attacks and so...

Two methods have been developed for identifying locations in watersheds where vegetative buffers would yield greater benefit for reducing agricultural nonpoint source pollution. The methods were compared and contrasted to evaluate the degree to which they identified the same or different locations within a watershed. The two methods included the terrain analysis-based topographic index, TI, (Qi...

Vector quantization (VQ), which has been widely applied in speech and image coding, provides an efficient technique for signal compression due to its excellent rate-distortion performance. However, it requires expensive encoding time to find the closest codeword to the input vector. This paper proposes a fast encoding method to speed up the closet codeword algorithm by accounting the occurrence...