Non invasive classification system of scoliosis curve types using least-squares support vector machines

Objective To determine scoliosis curve types using non invasive surface acquisition, without prior knowledge from X-ray data. Methods Classification of scoliosis deformities according to curve type is used in the clinical management of scoliotic patients. In this work, we propose a robust system that can determine the scoliosis curve type from non invasive acquisition of the 3D back surface of the patients. The 3D image of the surface of the trunk is divided into patches and local geometric descriptors characterizing the back surface are computed from each patch and constitute the features. We reduce the dimensionality by using principal component analysis and retain 53 components using an overlap criterion combined with the total variance in the observed variables. In this work, a multi-class classifier is built with least-squares support vector machines (LS-SVM). The original LS-SVM formulation was modified by weighting the positive and negative samples differently and a new kernel was designed in order to achieve a robust classifier. The proposed system is validated using data from 165 patients with different scoliosis curve types. The results of our non invasive classification were compared with those obtained by an expert using X-ray images. Results The average rate of successful classification was computed using a leave-one-out cross-validation procedure. The overall accuracy of the system was 95%. As for the correct classification rates per class, we obtained 96%, 84% and 97% for the thoracic, double major and lumbar/thoracolumbar curve types, respectively. Conclusion This study shows that it is possible to find a relationship between the internal deformity and the back surface deformity in scoliosis with machine learning methods. The proposed system uses non invasive surface acquisition, which is safe for the patient as it involves no radiation. Also, the design of a specific kernel improved classification performance.

Single-feed dual-frequency dual-polarized slotted square microstrip antenna

A novel dual frequency dual-polarized square microstrip patch antenna embedded with a slot is presented. The proposed antenna offers tunability of the frequency ratio between the two frequencies by adjusting the slot dimensions. This configuration also provides a size reduction up to -51 and 35% for the two modes as compared to a square micro strip patch antenna

Macrocyclic molecular square complex of zinc(II) self-assembled with a carbohydrazone ligand

A novel N4O coordination mode offers carbohydrazone ligands as a building block for interesting frameworks through self-assembly. Bridging mode of oxygen of bis(2-benzoylpyridine ketone) carbohydrazone (H2L) with metal centers facilitates the formation of the macrocyclic molecular square [Zn(HL)]4(BF4)4 · 10H2O, offers wide range of applications for carbohydrazones.

INVESTIGATIONS ON SLOT-LOADED SQUARE MICROSTRIP PATCH ANTENNAS FOR COMPACT DUAL FREQUENCY DUAL POLARIZED OPERATIONS

The thesis is the outcome of the experimental and theoretical investigations carried out on a novel slotted microstrip antenna.The antenna excites two resonance frequencies and provides orthogonal polarization. The radiation characteristics of the antenna are studied in detail. The antenna design is optimized using IE3D electromagnetic simulation tool. The frequency-Difference Time-Domain (FDTD) method is employed for the analysis of the antenna.The antenna can be used for personal and satellite communication applications.

Compact dual-polarised square microstrip antenna with triangular slots for wireless communication

Design of a dual linearly-polarised microstrip patch antenna, excited by two orthogonal microstrip feed lines, is presented. A reduction in patch size of 35% is obtained when compared to a square patch operating at the same frequency. The polarisations are oriented at +45 and - 45 with an isolation of more than 36 dB between the ports. Unlike earlier designs, the proposed structure provides better gain.

Strip-loaded hollow dielectric H-plane sectoral horn antennas for square radiation pattern

The radiation characteristics of a new type of hollow dielectric H-plane sectoral horn antenna are presented. Metallic strips of optimum length are loaded on the H-walls of the sectoral horns. The effects of strip loading for producing square patterns in the H plane are discussed.

Square Wave Voltammetric Determination of Various Pharmaceuticals

Cochin University of Science & Technology

On the relationship between the Method of Least Squares and Gram-Schmidt orthogonalization

The method of Least Squares is due to Carl Friedrich Gauss. The Gram-Schmidt orthogonalization method is of much younger date. A method for solving Least Squares Problems is developed which automatically results in the appearance of the Gram-Schmidt orthogonalizers. Given these orthogonalizers an induction-proof is available for solving Least Squares Problems.

Application of the european customer satisfaction index to postal services. Structural equation models versus partial least squars

Customer satisfaction and retention are key issues for organizations in today’s competitive market place. As such, much research and revenue has been invested in developing accurate ways of assessing consumer satisfaction at both the macro (national) and micro (organizational) level, facilitating comparisons in performance both within and between industries. Since the instigation of the national customer satisfaction indices (CSI), partial least squares (PLS) has been used to estimate the CSI models in preference to structural equation models (SEM) because they do not rely on strict assumptions about the data. However, this choice was based upon some misconceptions about the use of SEM’s and does not take into consideration more recent advances in SEM, including estimation methods that are robust to non-normality and missing data. In this paper, both SEM and PLS approaches were compared by evaluating perceptions of the Isle of Man Post Office Products and Customer service using a CSI format. The new robust SEM procedures were found to be advantageous over PLS. Product quality was found to be the only driver of customer satisfaction, while image and satisfaction were the only predictors of loyalty, thus arguing for the specificity of postal services

Visión de la calidad y el riesgo en instituciones de salud con programas de formación médica en Colombia

Este tuvo como objetivo describir la tendencia que tuvieron los resultados de los indicadores de calidad técnica y gerencia del riesgo: infecciones intrahospitalarias, mortalidad hospitalaria y reingreso hospitalario desde el año 2006 al 2010 y establecer si existieron diferencias entre las Instituciones de salud, con y sin convenios docente asistenciales tanto públicas y privadas de 11 ciudades de Colombia. Este estudio encontró que posterior a la promulgación de la ley 30 de 1992, el número de programas de medicina se incrementó considerablemente en la última década. Esta situación llevó a considerar dos cosas: primero que el número de Instituciones de práctica en el país puede ser insuficiente ante la gran cantidad de nuevos estudiantes de medicina, con algún grado de hacinamiento en los sitios de práctica y segundo que esa situación puede tener algún efecto sobre la calidad de la atención y el resultado de los indicadores medidos. Se evidenciaron importantes deficiencias técnicas en el reporte obligatorio de la información por parte de los hospitales, donde solo un 10% de ellas cumplieron con el reporte completo de los indicadores desde el año 2006; encontrando que se registra solamente un 65% del total de la información que debería estar publicada. En cuanto al análisis estadístico de los datos, se utilizó el chi cuadrado de tendencias, que no arrojó diferencias estadísticamente significativas de los indicadores en los periodos analizados entre las instituciones con y sin convenios docentes; pero sí evidenció diferencias entre la suma de mínimos cuadrados de dos de los indicadores.

Adobe Photoshop : Adjustment and Fill Layers

Find out more about Photoshop Adjustment and Fill Layers with this share of video tutorials.

Relationship between siblings and psychological adjustment in adolescents:

This study evaluated the effect of parent-child relationship quality (acceptance and differential treatment) over dimensions of the quality of sibling relationships (warmth and conflict) and psychological adjustment in 69 adolescent sibling dyads. The effects of parent-child relationships were evaluated both at the individual and dyadic levels. In older siblings, the father-child relationship had a significant effect on both their perception of warmth in the sibling relationship and psychological adjustment. In younger siblings, there was a significant dyadic effect of the older sibling’s perceived acceptance by mother on their perception of warmth in the sibling relationship. Results are analyzed based on the literature and questions for future research are proposed.

Religion, Marketing and Market: An Adjustment in the Language of Faith

O presente trabalho se propõe fazer uma análise de categorias sociais que a primeira vista não tem proximidade, na verdade, podem, inclusive, parecer antagônicas. Trata-se das relações entre Religião, Marketing e Mercado. O trabalho se apóia num referencial teórico mais próximo das ciências sociais, todavia, considera a Religião, em sua expressão institucional –a igreja– como um empreendimento social, uma empresa dos tempos modernos. Procura demonstrar que, para aderir ao mundo moderno, plasmado pela idéia de competição e consumo da sociedade capitalista, a religião reorganizou sua linguagem para atender as exigências desses tempos, já considerados Pós-modernos. A análise é feita a partir do caso brasileiro que, como muitos paises da América Latina, acomodam no seu tecido social, as mais recentes expressões da religião cristã, em especial, os grupos evangélicos que pululam as periferias das grandes cidades desse  continente americano.