Osvaldo Gervasi

Computational Science and Its Applications - ICCSA 2006

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Computational Science and Its Applications – ICCSA 2004

Human face detection plays an important role in applications such as video surveillance, human computer interface, face recognition, and face image database management. The face recognition by a CCD camera has the merit of being linked with other recognition systems such as an iris recognition to implement a multimodal recognition system. This paper is concerned with a new approach to face recognition that is automatically distinguished from moving pictures. Based on the research about recognition of color image by a CCD camera, we first find the proper value of color images in order to distinguish the tone of skin from other parts of face. Then, we look for the skin color among the regions of skin color converting RGB into Y , Cb, Cr to find skin parts of face. This new method can be applied to real-time biometric systems. We have developed the approach to face recognition with eigenface, focusing on the effects of eigenface to represent human face under several environment conditions. Finally an error rate is compared when face recognition is processed with facial features through the PCA (principal component analysis).

Computational Science and Its Applications – ICCSA 2012

The neoclassical production function assumes that economic growth depends on exogenous factors of production centred on capital, labour and technology. However, residual variables, notably social capabilities and knowledge, are neglected. This study seeks to highlight that, in fact, they are key variables for understanding the economic growth and recent structural changes of an industrial cluster, both in technical and organizational terms. In this work, the peculiarity of knowledge and in particular of tacit knowledge form a crucial element in the social capabilities that are associated with enlarging knowledge learning processes and network diffusion. The aim of this research is to analyse the key role that knowledge and innovations play in the local wedding system of Bari in Puglia. They are the decisive factors in the survival of firms in a global market for the creation of competitive advantage and provide a basis for continuous innovation. The relationship between innovation and knowledge is discussed in the theoretical part of the paper, while the empirical aspect remains based upon results of consumer and producer surveys. The objective is to show how innovation, including demand-driven, can influence companies’ behaviours.

Computational Science and Its Applications – ICCSA 2013

The smart phone usage and multimedia devices have been increasing yearly and predictions indicate drastic increase in the upcoming years. Recently, various wireless technologies have been introduced to add flexibility to these gadgets. As data plans offered by the network service providers are expensive, users are inclined to utilize freely accessible and commonly available Wi-Fi networks indoors. LTE (Long Term Evolution) has been a topic of discussion in providing high data rates outdoors and various service providers are planning to roll out LTE networks all over the world. The objective of this presentation is to compare usefulness of these two leading wireless schemes based on LTE and Wireless Mesh Networks (WMN) and bring forward their advantages for indoor and outdoor environments. We also investigate to see if a hybrid LTE-WMN network may be feasible. Both these networks are heterogeneous in nature, employ cognitive approach and support multi hop communication. The main motivation behind this work is to utilize similarities in these networks, explore their capability of offering high data rates and generally have large coverage areas. In this work, we compare both these networks in terms of their data rates, range, cost, throughput, and power consumption. We also compare 802.11n based WMN with Femto cell in an indoor coverage scenario, while for outdoors; 802.16 based WMN is compared with LTE. The main objective is to help users select a network that could provide enhanced performance in a cost effective manner. More information can be found at http://www.iccsa.org/invited-speakers Neoclassical Growth Theory, Regions and Spatial Externalities

Computational Science and Its Applications – ICCSA 2010

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COMPCHEM: Progress Towards GEMS a Grid Empowered Molecular Simulator and Beyond

Foundations and structure of the building blocks of GEMS, the ab initio molecular simulator designed for implementation on the EGEE computing Grid, are analyzed. The impact of the computational characteristics of the codes composing its blocks (the calculation of the ab initio potential energy values, the integration of the dynamics equations of the nuclear motion, and the statistical averaging of microscopic information to evaluate the relevant observable properties) on their Grid implementation when using rigorous ab initio quantum methods are discussed. The requests prompted by this approach for new computational developments are also examined by considering the present implementation of the simulator that is specialized in atom diatom reactive exchange processes.

A comparison of time‐dependent and time‐independent quantum reactive scattering—Li+HF→LiF+H model calculations

Reactive scattering probabilities are computed over a wide range of collision energies for a model system based on the Li+HF→LiF+H reaction using both grid based time‐dependent and time‐independent quantum mechanical methods. The computations are carried out using a fixed Li–F–H angle which is chosen to be that at which the barrier to the chemical reaction is lowest. The calculated reaction probabilities for this system display many sharp features as a function of energy which are ascribed to scattering resonances. The time‐independent calculations have been carried out on a very dense energy grid, thus permitting detailed comparison between time‐independent and time‐dependent methods (in the latter case, a single computation of the wave packet dynamics provides information on the energy dependence over a given energy range). The results show that the time‐dependent calculations are capable of reproducing even the sharpest resonance features computed using the time‐independent method. The time‐dependent techniques are conceptually very simple and therefore easily implemented. The results presented also demonstrate that the grid based time‐dependent quantum mechanical methods used here are able to describe threshold energy dependence of reaction probabilities where the exit channel kinetic energy is effectively zero. The nature of some of the resonance structures are investigated by computing the time‐independent continuum wave functions at the ‘‘resonance’’ energies thus mapping out the nodal structure of the wave functions. The good agreement between time‐independent and time‐dependent methods is shown to be maintained when a centrifugal barrier is added to the potential to simulate the effect of nonzero orbital angular momentum.

On the structuring of the computational chemistry virtual organization COMPCHEM

The first moves to structure the COMPCHEM Grid virtual organization of the computational chemistry community are discussed. A tool based on a credit system developed to guarantee its sustainability is presented.

A quasiclassical trajectory test for a potential energy surface of the Li+HF reaction

A three‐dimensional quasiclassical trajectory study of the Li→HF→LiF+H reaction has been performed on a recently proposed analytical potential energy surface (PES) fitted to ab initio points. The results of the calculations are compared with the experiment. Previous related work on a semiempirical PES is noted.

SIMBEX: a portal for the a priori simulation of crossed beam experiments

The architecture and the computational kernels of Simulation of Crossed Molecular Beam Experiments, an Internet portal managing the simulation of elementary bimolecular processes as those occurring in crossed beam apparatuses, is discussed. The construction of this portal is our contribution to project 003/001 of the COST in Chemistry action D23 (METACHEM: Metalaboratories for complex computational applications in chemistry). The portal is specifically designed to support the collaborative efforts of various Computational Chemistry and Computer Science European laboratories aimed at building an a priori molecular simulator based on a Grid infrastructure. Such an environment makes use of free-software packages and was implemented using Web technologies.