This work should give an overview of various shadow techniques used in real-time rendering. Proper shadows are a crucial part of realistic looking scenes and therefore a huge research field in computer graphics. We will focus on the two major shadowing techniques shadow volumes and shadow mapping, including most popular rendering approaches, whereby the most practical approaches should be point...

Abstract:  The precision of conventional sampling designs is not usually satisfactory for estimating parameters of clump and rare populations. Many of fish species live in school and disperse all over a vast area like a sea so that they are rare compare to their habitats. Theory of a class of sampling designs called adaptive sampling designs has rapidly grown during last decade which solved the...

Abstract:  The precision of conventional sampling designs is not usually satisfactory for estimating parameters of clump and rare populations. Many of fish species live in school and disperse all over a vast area like a sea so that they are rare compare to their habitats. Theory of a class of sampling designs called adaptive sampling designs has rapidly grown during last decade which solv...

In this paper we explore three approaches to assigning Gene Ontology semantic classifications to abstracts from the PubMed database: lexical lookup, information retrieval and machine learning. To evaluate the approaches we use two “gold” standards derived from the yeast genome database (SGD). While evaluation provides insights into the three approaches, it also reveals the difficulties in const...

background nursing teachers have difficulties fulfilling multiple roles expectations and balancing the various dimensions of their roles that may lead to role strain. in order to lack of culturally and academically proper scale in iran to measure role strain in nursing teachers, localizing a foreign scale in this field is necessary. objectives the objective of this study was psychometric evalua...

In the context of ridge regression, the estimation of ridge (shrinkage) parameter plays an important role in analyzing data. Many efforts have been put to develop skills and methods of computing shrinkage estimators for different full-parametric ridge regression approaches, using eigenvalues. However, the estimation of shrinkage parameter is neglected for semiparametric regression models. The m...

Given a null geodesic γ0(λ) with a point r in (p, q) conjugate to p along γ0(λ) , there will be a variation of γ0(λ) which will give a time-like curve from p to q. This is a well-known theory proved in the famous book[3]. In the paper we prove that the timelike curves coming from the above-mentioned variation have a proper acceleration which approaches infinity as the time-like curve approaches...