44 research outputs found
Forensic Dental Age Estimation of North Indian Children Using Three Radiological Scoring Methods
Get PDFAlthough believed to be reliable in children, dental age estimations have reportedly shown variations in their accuracy levels, indicating regional differences. The present paper aims to study the error threshold of the Nolla, Demirjian and Willems methods for age estimation of North Indian children.
Digital orthopantomograms of 168 children aged 3-15 years were analyzed for the three methods. Demirjian dental age was found to be closest to the mean chronological age, as indicated by the p-value of paired t-test. The error range for the Willems and Demirijian methods was ±5 years with 87.5% of cases showing error within the range of ±2 years, and it was ±6 years with 84.5% of cases showing error within ±2 years using the Nolla method. The mean absolute error for the Nolla, Demirjian and Willems methods was 1.09, 1.10 and 0.97 years, respectively.
The Willems method was better suited for dental age estimation of the studied population, though none of the methods precisely estimated the age of the participants. Wide variations in age estimates of varied population groups may be due to differences in statistical methods or genetic factors. Thus, comparison of the methods for different populations by the same researcher is suggested to reduce certain biasness (statistical methodology) in the study
Operational strategies for HVDC transmission in smart grids: the security versus markets dilemma
No full textOver the last decades, the European transmission system has made many profound changes in the network and has focused on three main concepts: i) flexibility, ii) integration, and iii) sustainability to increase the technological innovations, and to improve the market design. The currently used methodby transmission system operators (TSOs) is trying to accomplish these requirements, but it is important to realize that each TSO has its own grid protocols and standards. Consequently, all major TSOs in the interconnected meshed European transmission system are facing a huge difficulty in maintaining a strong operational coordination to work together as a one single European technical market model. In order to guarantee the highest security of electricity supply, it is necessary to structure a stable, reliable and secure analytical AC framework that takes into consideration the stochastic nature of system in-feeds in the daily operational planning. In this thesis it is analyzed how incorporation of smart technologies such as HVDC transmission can be used as a smart grid solution to improve the power system security and lower the risk in different adjacent areas/zones. The proposed risk-based security assessment (RBSA) methodology based on Monte-Carlo sampling is employed to investigate the security of the system and to quantify the expected system risk. It is shown that the market optimal HVDC power set-points may result in unnecessarily high risk when subjected to the unavoidable uncertainty of inputs(fluctuations in load and RES) inherent to day-ahead forecasting. A detailed comparison of market optimal versus security optimal HVDC power set-point is presented. It is proposed to properly adapt the HVDC set-points with respect to the actual operating situation, which can be quite different from the day-ahead point forecast. Moreover, it is shown that by being able to adapt HVDC set-points in realtime operation, further more serious and more costly remedial actions such as active re-dispatch and load shedding, can be avoided. Furthermore, a study with two HVDC transmission lines is performed to show the necessity of coordinated control of the HVDC lines, and how this can reduce the stress in the network by acting as a tool to shift generation.Electrical Engineering | Sustainable Energy Technolog
The City as Medusa, Grandma and Whore in Arundhati Roy's The Ministry of Utmost Happiness
No full textThe paper assesses the city of Delhi as it is perceived and depicted in The Ministry of Utmost Happiness, the second novel of Booker-prize winning author, political essayist and writer-activist Arundhati Roy and the ways in which it challenges a hegemonic perception of urban spaces and through these spaces, the perception of a developing nation in an age of neoliberal capitalism and globalization in the free market. The paper underscores the various metaphors, figurative allusions and the shifting personas the city acquires and the gendering and transitioning it undergoes at the hands of the author. Likewise, the paper attempts an understanding of the city as a many-layered, living, breathing entity with surprises and secrets, celebrations and heartbreaks, as much a character and as human with an intimate and intense subject status as any of the inmates inhabiting it. It looks at the city space as an empowering and enabling agency offering shelter, variety, anonymity and opportunity to those who seek it and the cityscape as frequently alienating, ruthless and indifferent, foregrounding the juxtaposition of these two sharply contrasting images and the symbolic significance of them
Orthodontic and prosthodontic management of an adult patient with unilateral cleft lip and palate
No full textCleft lip and palate is a common congenital malformation. Individuals born with this type of deformity, face number of challenges such as facial esthetics, hearing impairment, anatomical deformities to name a few. These patients require various treatments involving a multidisciplinary team such as prosthodontists, orthodontists, cosmetic dentists and surgeons. This report describes a case of orthodontic and prosthetic rehabitilation of an adult patient with unilateral cleft lip and palate
A subspace approach to blind space-time signal processing for wireless communication systems
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