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Inward-Inclined Implant Platform for the Amplified Platform-Switching Concept: 18-Month Follow-up Report of a Prospective Randomized Matched-Pair Controlled Trial

Canullo, Luigi; Rosa, Jose Carlo; Pinto, Vicente Souza; Francischone, Carlos Eduardo; Goetz, Werner
Fonte: QUINTESSENCE PUBLISHING CO INC; HANOVER PARK Publicador: QUINTESSENCE PUBLISHING CO INC; HANOVER PARK
Tipo: Artigo de Revista Científica
Português
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Purpose: This prospective randomized matched-pair controlled trial aimed to evaluate marginal bone levels and soft tissue alterations at implants restored according to the platform-switching concept with a new inward-inclined platform and compare them with external-hexagon implants. Materials and Methods: Traditional external-hexagon (control group) implants and inward-inclined platform implants (test group), all with the same implant body geometry and 13 mm in length, were inserted in a standardized manner in the posterior maxillae of 40 patients. Radiographic bone levels were measured by two independent examiners after 6, 12, and 18 months of prosthetic loading. Buccal soft tissue height was measured at the time of abutment connection and 18 months later. Results: After 18 months of loading, all 80 implants were clinically osseointegrated in the 40 participating patients. Radiographic evaluation showed mean bone losses of 0.5 +/- 0.1 mm (range, 0.3 to 0.7 mm) and 1.6 +/- 0.3 mm (range, 1.1 to 2.2 mm) for test and control implants, respectively. Soft tissue height showed a significant mean decrease of 2.4 mm in the control group, compared to 0.6 mm around the test implants. Conclusions: After 18 months, significantly greater bone loss was observed at implants restored according to the conventional external-hexagon protocol compared to the platform-switching concept. In addition...

Análise, desenvolvimento e controle de uma plataforma de movimentos com 6 graus de liberdade; Analysis, development and control of a platform of movements with 6 degrees of freedom

Breganon, Ricardo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 19/05/2014 Português
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Nos últimos anos, tem havido grande interesse em estudar manipuladores paralelos, aplicados principalmente em simuladores de voo, com seis graus de liberdade. O interesse em estruturas cinemáticas paralelas é motivado por sua alta rigidez e excelente capacidade de posicionamento em relação às estruturas cinemáticas seriais. Além disso, como os atuadores são posicionados em uma base, eles podem ser aplicados em cargas pesadas e ainda apresentam baixo consumo de energia, tendo em vista que vários atuadores atuam simultaneamente no mesmo corpo. A presente tese apresenta o projeto de três controladores, sendo eles, o controlador H infinito com realimentação de saída, o controlador PID e o controlador Fuzzy, com isto, esta metodologia poderá ser empregada na construção de um futuro simulador de voo. O modelo dos atuadores foi obtido através de uma entrada degrau de tensão nos motores, medindo os seus deslocamentos através dos encoders acoplados, individualmente, a cada um dos respectivos eixos dos motores. Sabendo-se a relação de transmissão do mecanismo de movimento entre o motor e cada haste dos atuadores obtém-se o deslocamento de cada haste a partir da rotação de cada motor medida pelo correspondente encoder e com isso obtém-se o modelo matemático de cada atuador em conjunto com seu sistema de transmissão. Entretanto...

Conception and implementation of a Tiny Smart Environment Platform

Souza, Luiza de
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
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Nos últimos anos, tem-se realizado muita pesquisa e desenvolvimento na área de Ambient Assisted Living (AAL). Entretanto, até 2012, não existia nenhuma definição dos requisitos de sistema para AAL, muito menos um padrão para as plataformas desenvolvidas. As soluções que já foram desenvolvidas não são amplamente aceitas fora do escopo de seus projetos e podem ser divididas em dois grandes grupos. O primeiro deles é composto por plataformas universais e flexíveis, entretanto essas mesmas plataformas são muito complexas e de difícil compreensão. O segundo grupo engloba os sistemas monolíticos, que foram desenvolvidos para um problema específico e por esse motivo implementam apenas funcionalidades básicas. Devido ao problema de se encontrar uma plataforma que fosse, ao mesmo tempo, de fácil compreensão e suficientemente flexível e universal, se optou pela concepção e desenvolvimento de uma nova solução, que foi chamada de Tiny Smart Environment Platform (TinySEP). TinySEP é uma plataforma compacta que utiliza dois conceitos de engenharia de software: driver model e signal slot model. Ela permite que um único sistema seja capaz de se adaptar aos diversos cenários e às necessidades de cada um dos seus usuários...

Photoelastic Analysis of the Influence of Platform Switching on Stress Distribution in Implants

Pellizzer, Eduardo Piza; Falcon-Antenucci, Rosse Mary; Perri de Carvalho, Paulo Sergio; Santiago, Joel Ferreira; Dantas de Moraes, Sandra Lucia; de Carvalho, Bruno Machado
Fonte: Allen Press Inc Publicador: Allen Press Inc
Tipo: Artigo de Revista Científica Formato: 419-424
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The aim of this study was to evaluate the stress distribution of platform switching implants using a photoelastic method. Three models were constructed of the photoelastic resin PL-2, with a single implant and a screw-retained implant-supported prosthesis. These models were Model A, platform 5.0 mm/abutment 4.1 mm; Model B, platform 4.1 mm/abutment 4.1 mm; and Model C, platform 5.00 mm/abutment 5.00 mm. Axial and oblique (45 degrees) loads of 100 N were applied using a Universal Testing Machine (EMIC DL 3000). Images were photographed with a digital camera and visualized with software (AdobePhotoshop) to facilitate the qualitative analysis. The highest stress concentrations were observed at the apical third of the 3 models. With the oblique load, the highest stress concentrations were located at the implant apex, opposite the load application. Stress concentrations decreased in the cervical region of Model A (platform switching), and Models A (platform switching) and C (conventional/wide-diameter) displayed similar stress magnitudes. Finally, Model B (conventional/regular diameter) displayed the highest stress concentrations of the models tested.

Platform Switching: Biomechanical Evaluation Using Three-Dimensional Finite Element Analysis

Tabata, Lucas Fernando; Rocha, Eduardo Passos; Ricardo Barao, Valentim Adelino; Assuncao, Wirley Goncalves
Fonte: Quintessence Publishing Co Inc Publicador: Quintessence Publishing Co Inc
Tipo: Artigo de Revista Científica Formato: 482-491
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Purpose: The objective of this study was to evaluate, using three-dimensional finite element analysis (3D FEA), the stress distribution in peri-implant bone tissue, implants, and prosthetic components of implant-supported single crowns with the use of the platform-switching concept. Materials and Methods: Three 3D finite element models were created to replicate an external-hexagonal implant system with peri-implant bone tissue in which three different implant-abutment configurations were represented. In the regular platform (RP) group, a regular 4.1-mm-diameter abutment (UCLA) was connected to regular 4.1-mm-diameter implant. The platform-switching (PS) group was simulated by the connection of a wide implant (5.0 mm diameter) to a regular 4.1-mm-diameter UCLA abutment. In the wide-platform (WP) group, a 5.0-mm-diameter UCLA abutment was connected to a 5.0-mm-diameter implant. An occlusal load of 100 N was applied either axially or obliquely on the models using ANSYS software. Results: Both the increase in implant diameter and the use of platform switching played roles in stress reduction. The PS group presented lower stress values than the RP and WP groups for bone and implant. In the peri-implant area, cortical bone exhibited a higher stress concentration than the trabecular bone in all models and both loading situations. Under oblique loading...

Implant Platform Switching: Biomechanical Approach Using Two-Dimensional Finite Element Analysis

Tabata, Lucas Fernando; Assuncao, Wirley Goncalves; Ricardo Barao, Valentim Adelino; Sousa, Edson Antonio Capello; Gomes, Erica Alves; Delben, Juliana Aparecida
Fonte: Lippincott Williams & Wilkins Publicador: Lippincott Williams & Wilkins
Tipo: Artigo de Revista Científica Formato: 182-187
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In implant therapy, a peri-implant bone resorption has been noticed mainly in the first year after prosthesis insertion. This bone remodeling can sometimes jeopardize the outcome of the treatment, especially in areas in which short implants are used and also in aesthetic cases. To avoid this occurrence, the use of platform switching (PS) has been used. This study aimed to evaluate the biomechanical concept of PS with relation to stress distribution using two-dimensional finite element analysis. A regular matching diameter connection of abutment-implant (regular platform group [RPG]) and a PS connection (PS group [PSG]) were simulated by 2 two-dimensional finite element models that reproduced a 2-piece implant system with peri-implant bone tissue. A regular implant (prosthetic platform of 4.1 mm) and a wide implant (prosthetic platform of 5.0 mm) were used to represent the RPG and PSG, respectively, in which a regular prosthetic component of 4.1 mm was connected to represent the crown. A load of 100 N was applied on the models using ANSYS software. The RPG spreads the stress over a wider area in the peri-implant bone tissue (159 MPa) and the implant (1610 MPa), whereas the PSG seems to diminish the stress distribution on bone tissue (34 MPa) and implant (649 MPa). Within the limitation of the study...

Influence of various implant platform configurations on peri-implant tissue dimensions: an experimental study in dog

Baffone, Gabriele M.; Botticelli, Daniele; Pantani, Fabio; Cardoso, Leandro Carvalho; Schweikert, Michael T.; Lang, Niklaus P.
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 438-444
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AimTo evaluate the influence (i) of various implant platform configurations and (ii) of implant surface characteristics on peri-implant tissue dimensions in a dog model.Material and methodsMandibular premolars and first molars were extracted bilaterally in six Labrador dogs. After 3 months of healing, two implants, one with a turned and a second with a moderately rough surface, were installed on each side of the mandible in the premolar region. on the right side of the mandible, implants with a tapered and enlarged platform were used, while standard cylindrical implants were installed in the left side of the mandible. Abutments with the diameter of the cylindrical implants were used resulting in a mismatch of 0.25 mm at the tapered implant sites. The flaps were sutured to allow a non-submerged healing. After 4 months, the animals were sacrificed and ground sections were obtained for histometric assessment.ResultsAll implants were completely osseointegrated. A minimal buccal bone resorption was observed for both implant configurations and surface topographies. Considering the animals as the statistical unit, no significant differences were found at the buccal aspect in relation to bone levels and soft tissue dimensions. The surface topographies did not influence the outcomes either.ConclusionsThe present study failed to show differences in peri-implant tissue dimensions when a mismatch of 0.25 mm from a tapered platform to an abutment was applied. The surface topographies influence a neither marginal bone resorption or peri-implant soft tissue dimension.To cite this article:Baffone GM...

Photoelastic comparison of single tooth implant-abutment-bone of platform switching vs conventional implant designs

Rossi, Fabiana; Zavanelli, Adriana Cristina; Zavanelli, Ricardo Alexandre
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 124-130
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Objectives: The maintenance and stability of peri-implantar soft tissue seem to be related to the crestal bone around the implant platform and different implant designs connections might affect this phenomenon. The aim of this study was to evaluate by photoelastic analysis the stress distribution in the cervical and apical site of implant-abutment interface of conventional implant joints (external hex, internal hex and cone morse) and compare to the novel platform switching design. Materials and methods: It was fabricated photoelastic models using five different implant-abutment connection, one set of external hex (Alvim Ti, Neodent, Curitiba, Brazil), one set of internal hex (Full Osseotite, Biomet 3i, Florida, USA), one cone morse set (Alvim CM, Neodent, Curitiba, Brazil), and two sets of internal hex plus platform switching concept (Alvim II Plus, Neodent, Curitiba, Brazil) (Certain Prevail, Biomet 3i, Florida, USA). These models were submitted to two compressive loads, axial from 20 kgf (load I) and another (load II), inclined 45° from 10 kgf. During the qualitative analysis, digital pictures were taken from a polariscope, for each load situation. For the quantitative analyses in both situations of load, the medium, minimum and maximum in MPa values of shear strain were determined in the cervical and apical site. The Kruskal-Wallis test was used to compare the results between the different systems and between cervical and apical site were compared using Mann-Whitney U test. Results: The results from qualitative analysis showed less concentration of strain in the cervical area to the internal hex plus platform switching (Certain Prevail)...

Using multiple abstraction levels to speedup an MPSoC virtual platform simulator

Moreira, João; Klein, Felipe; Baldassin, Alexandro; Centoducatte, Paulo; Azevedo, Rodolfo; Rigo, Sandro
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 99-105
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Virtual platforms are of paramount importance for design space exploration and their usage in early software development and verification is crucial. In particular, enabling accurate and fast simulation is specially useful, but such features are usually conflicting and tradeoffs have to be made. In this paper we describe how we integrated TLM communication mechanisms into a state-of-the-art, cycle-accurate, MPSoC simulation platform. More specifically, we show how we adapted ArchC fast functional instruction set simulators to the MPARM platform in order to achieve both fast simulation speed and accuracy. Our implementation led to a much faster hybrid platform, reaching speedups of up to 2.9 and 2.1x on average with negligible impact on power estimation accuracy (average 3.26% and 2.25% of standard deviation). © 2011 IEEE.

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Ferraz, Cacilda Cunha; Anchieta, Rodolfo Bruniera; de Almeida, Erika Oliveira; Freitas, Amilcar Chagas; Ferraz, Fábio Cunha; Machado, Lucas Silveira; Rocha, Eduardo Passos
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 256-263
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Purpose: To evaluate the stress distribution in peri-implant bone by simulating the effect of an implant with microthreads and platform switching on angled abutments through tridimensional finite element analysis. The postulated hypothesis was that the presence of microthreads and platform switching would reduce the stress concentration in the cortical bone. Methods: Four mathematical models of a central incisor supported by an implant (5.0mm×13mm) were created in which the type of thread surface in the neck portion (microthreaded or smooth) and the diameter of the angled abutment connection (5.0 and 4.1mm) were varied. These models included the RM (regular platform and microthreads), the RS (regular platform and smooth neck surface), the SM (platform switching and microthreads), and the SS (platform switching and smooth neck). The analysis was performed using ANSYS Workbench 10.0 (Swanson Analysis System). An oblique load (100N) was applied to the palatine surface of the central incisor. The bone/implant interface was considered to be perfectly integrated. Values for the maximum (σmax) and minimum (σmin) principal stress, the equivalent von Mises stress (σvM), and the maximum principal elastic strain (e{open}max) for cortical and trabecular bone were obtained. Results: For the cortical bone...

Ambiente de simulação de manipuladores paralelos : modelagem, simulação e controle de uma plataforma Stewart; Simulation environmental for parallel manipulator : modeling simulation and control of Stewart platform

Fabian Andres Lara Molina
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 02/09/2008 Português
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O presente trabalho recopila e aplica conceitos concernentes à modelagem dos manipuladores paralelos, desta maneira é proposta um ambiente de simulação para manipuladores paralelos aplicada à Plataforma Stewart. O manipulador paralelo de seis graus de liberdade - Plataforma Stewart é utilizado em aplicações que requerem alto desempenho de posicionamento: alta rigidez, alta razão capacidade de carga - peso do manipular, alta exatidão no movimento. Entre as aplicações nas quais se tem utilizado a Plataforma Stewart estão: simuladores de vôo, manipuladores cirúrgicos, máquinas ferramentas CNC, sistemas de locomoção bípedes, etc. São enfatizados aspectos concernentes à modelagem cinemática e dinâmica deste manipulador. A partir do modelo é proposta a simulação e controle de posição no espaço das juntas em MATLAB - SimulinkTM. A validação da simulação é feita mediante um estudo de casos.; The present work involves and applies parallel manipulator design concepts; therefore it is proposed a parallel manipulator design methodology applied to Stewart Platform. In this research project, it is modeled, simulated and analyzed the six degrees of freedom parallel manipulator - Stewart Platform. This system is used on applications with high position performance: high stiffness...

Cross platform 3D rendering engines and mobile devices/smartphones

Beernaert, Leander Edward Bessa
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Dissertação de Mestrado
Publicado em 07/11/2011 Português
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Dissertação de mestrado em Engenharia Informática; Now more than ever, we live in a cross platform technological world. We are surrounded by various platforms, each with their own set of advantages and drawbacks. We’ve come to a point where we cannot delay the transition of software from one platform to another. This has become increasingly more visible with the "rise of the smartphones". Their evolution has sparked quite an interest and due to their ubiquitous nature and, CPU and GPU performance, they prove to be very interesting and useful computing devices. The aim of this dissertation is to port the 3D rendering engine, Curitiba, currently being developed on Windows, to the second and third most popular platforms: Mac OS X and iOS (iPhone and iPad), respectively, and create one unified project. Due to incompatibilities presented by the wxWidgets toolkit (2.8.x) on Mac OS X (10.6 and greater), we ported Curitiba to the GNU/Linux platform first since it’s also POSIX compliant. Sadly, the Android platform had to be left out because, at the time, it lacked the support for C++’s STL and Exceptions. Throughout this dissertation we shall cover all the challenges faced to transform Curitiba into a cross platform software and the development of the resulting unified project. Our secondary objective is to replace the traditional keyboard and mouse interactions in a 3D rendering engine by implementing new interaction models which make use of the touch screen and/or the sensors available on the iOS platform.; Agora mais que nunca...

Personalization platform for multimodal ubiquitous computing applications

Santos, Pedro Emanuel Albuquerque e Baptista dos
Fonte: Faculdade de Ciências e Tecnologia Publicador: Faculdade de Ciências e Tecnologia
Tipo: Dissertação de Mestrado
Publicado em //2013 Português
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Dissertação para obtenção do Grau de Mestre em Engenharia Informática; We currently live surrounded by a myriad of computing devices running multiple applications. In general, the user experience on each of those scenarios is not adapted to each user’s specific needs, without personalization and integration across scenarios. Moreover, developers usually do not have the right tools to handle that in a standard and generic way. As such, a personalization platform may provide those tools. This kind of platform should be readily available to be used by any developer. Therefore, it must be developed to be available over the Internet. With the advances in IT infrastructure, it is now possible to develop reliable and scalable services running on abstract and virtualized platforms. Those are some of the advantages of cloud computing, which offers a model of utility computing where customers are able to dynamically allocate the resources they need and are charged accordingly. This work focuses on the creation of a cloud-based personalization platform built on a previously developed generic user modeling framework. It provides user profiling and context-awareness tools to third-party developers. A public display-based application was also developed. It provides useful information to students...

Innovation, Openness, and Platform Control

Parker, Geoffrey; Van Alstyne, Marshall
Fonte: Cambridge, MA; Alfred P. Sloan School of Management, Massachusetts Institute of Technology Publicador: Cambridge, MA; Alfred P. Sloan School of Management, Massachusetts Institute of Technology
Tipo: Trabalho em Andamento
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We explore innovation, openness, and the duration of intellectual property protection in markets characterized by platforms and their ecosystems of complementary applications. We find that competition among application developers can reduce innovation while competition among platforms can increase innovation. Developers can be better off submitting to platform control as opposed to producing for an unsponsored platform. Although a social planner would open a platform sooner and to a greater degree than would a private platform sponsor, a platform sponsor’s ability to control downstream innovation gives it reason to behave more like a social planner. However, if platforms are to perform this role, platform sponsors need longer duration rights than application developers. Results can inform antitrust and intellectual property regulation, technological innovation, competition policy, and intellectual property strategy.; The National Science Foundation, Cisco Systems Inc, and The Microsoft Corporation

A study of a Gough-Stewart platform-based manipulator for applications in biomechanical testing.

Ding, Boyin
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2014 Português
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This thesis investigates the development and application of a robotic system for in-vitro biomechanical testing to study the mechanisms leading to human joint injury and degeneration in an ethical and safe manner. Six degree of freedom (6-DOF) robotic-based systems, in particular Gough-Stewart platform-based systems, have been increasingly used in applications of biomechanical testing where 6-DOF mobility, large load capacity, and high stiffness and positioning accuracy are required from the testing machine. This study proposes a novel Gough-Stewart platform-based manipulator with ultra-high stiffness and accuracy for use in biomechanical testing and investigates its mechanism and control. Not only restricted to biomechanical testing, the proposed manipulator concept can also be applied to other robotic-based applications, particularly those requiring ultra-high accuracy positioning under large external loads (e.g machining). Four main features of the proposed manipulator are individually studied in this thesis: namely, stiffness and control of a non-collocated actuator-sensor mechanism, active preload control using actuation redundancy for backlash elimination, adaptive velocity-based load control of human joints for unconstrained testing...

WIRELESS SENSOR NETWORK PLATFORM FOR HARSH INDUSTRIAL ENVIRONMENTS

El Kouche, AHMAD
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
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Wireless Sensor Networks (WSNs) are popular for their wide scope of application domains ranging from agricultural, medical, defense, industrial, social, mining, etc. Many of these applications are in outdoor type environments that are unregulated and unpredictable, thus, potentially hostile or physically harsh for sensors. The popularity of WSNs stems from their fundamental concept of being low cost and ultra-low power wireless devices that can monitor and report sensor readings with little user intervention, which has led to greater demand for WSN deployment in harsh industrial environments. We argue that there are a new set of architectural challenges and requirements imposed on the hardware, software, and network architecture of a wireless sensor platform to operate effectively under harsh industrial environments, which are not met by currently available WSN platforms. We propose a new sensor platform, called Sprouts. Sprouts is a readily deployable, physically rugged, volumetrically miniature, modular, network standard, plug-and-play (PnP), and easy to use sensor platform that will assist university researchers, developers, and industrial companies to evaluate WSN applications in the field, and potentially bring about new application domains that were previously difficult to accomplish using off the shelf WSN development platforms. Therefore...

Usability of an internet-based platform (Next.Step) for adolescent weight management

Sousa,Pedro; Fonseca,Helena; Gaspar,Pedro; Gaspar,Filomena
Fonte: Sociedade Brasileira de Pediatria Publicador: Sociedade Brasileira de Pediatria
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2015 Português
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OBJECTIVE: The current study evaluates the usability perception of an e-therapeutic platform (supported by electronic processes and communication), aiming to promote the behavior change and to improve the adolescent health status through increased and interactive contact between the adolescent and the clinical staff. METHODS: This was a correlational study with a sample of 48 adolescents (12-18 years) who attended a Pediatric Obesity Clinic between January and August of 2012. Participants were invited to access, during 24 weeks, the e-therapeutic multidisciplinary platform (Next.Step) in addition to the standard treatment program. A usability questionnaire was administered and the platform performance and utilization indicators were analyzed. RESULTS: The users' perception of satisfaction, efficiency, and effectiveness regarding the Next.Step platform was clearly positive. However, only 54.17% of the enrolled adolescents accessed the platform, with a mean task-completion rate of 14.55% (SD = 18.853). The higher the number of the platform consulted resources, the greater the tendency to enjoy the platform, to consider it exciting and quick, to consider that the time spent in it was useful, to consider the access to information easy...

Institutionalized elderly rehabilitation Improving balance ability with a platform technology

Pimentel, Maria Manuela da Silva; Mendes, Eugénia; Novo, André; Preto, Leonel
Fonte: Instituto Politécnico de Bragança Publicador: Instituto Politécnico de Bragança
Tipo: Conferência ou Objeto de Conferência
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Ageing is associated with a decrease in the functionality of all organic systems. One factor that affects the quality of life in the elderly is the decrease of balance that sometimes leads to falls and consequently the fear of falling. In this sense, it is essential to try to mitigate this progressive degeneration. Platform technology can be used to improve balance in elderly and thus enable them a better quality of life and well-being. To investigate whether an exercise program, using platform games, improve balance in a group of institutionalized elderly. A quasi-experimental study was design in which it was used a sociodemographic questionnaire, nine of the ten tests of Fullerton Balance Advanced Scale to assess balance and the Falls Efficacy Scale (FES) to assess fear of falling. The exercises program where performed on the platform, and applied in 10 minutes session three times a week for two months. 20 elderly were included, 70% women, with an average age of 82.20 ± 4.92 years, 55% are widowed, 35% single and 10% are married. Results of the Fullerton Balance Advanced Scale evaluation showed that 17 elderly improved balance and 3 elderly decreased. Fear of falling results showed a statistically significant increase (Z = -2.875; p = .004) from the first to the second assessment moment (67.20 ± 12.07 vs 70.25 ± 12.94). The exercise program set up with the technology platform has improved balance and decreased fear of falling in the elderly who participated in this study. Platform games can be used in rehabilitation of elderly to improve balance and reduce fear of falling.

Origin, structure and exposure history of a wave-cut platform more than 1 Ma in age at the coast of northern Spain: A multiple cosmogenic nuclide approach

Alvarez-Marrón, Joaquina; Hetzel, R.; Niedermann, S.; Menéndez, R.; Marquínez, J.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 918459 bytes; application/pdf
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19 pages, 9 figures, 4 tables.-- Available online Mar 19, 2007.; Along the Asturian coast of northern Spain an uplifted wave-cut platform extends for not, vert, similar 100 km east–west. The steep cliff which bounds the gently seaward-dipping platform to the north increases in height from 30 m in the west to 100 m in the east and reflects the overall eastward increase in platform elevation. The southern edge of the 2–4 km-wide platform runs along the foothills of the Cantabrian Mountains, as constrained by a high-resolution digital elevation model. The marine platform, which was carved into deformed Paleozoic bedrock with abundant quartzite beds, is largely covered by weathered marine and continental sediments. Quartzite samples from flat bedrock outcrops which are currently not covered by sediment or soil yield cosmogenic nuclide concentrations (21Ne, 10Be and 26Al) that demonstrate a long and complex exposure history, including periods of burial with partial or complete shielding from cosmic rays. The combination of multiple cosmogenic nuclides yields a minimum age of 1–2 Ma for the platform. Taking into account (i) the horizontal and vertical extent of the platform, (ii) the high resistance to erosion of the quartzitic bedrock...

A selection framework for derivative products: Development of an impact metric and platform value assessment methodology

Alvaro, Arciniegas
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
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In today’s product development environment, most companies develop product platforms due to the time and cost advantages that are reaped on subsequent development efforts. Many Research and Development (R&D) efforts conclude with the establishment of a platform that anticipates certain technologies and/or markets. However, when a new unanticipated market or technology arises, firms often struggle to assess these opportunities. Most tools to date focus on the upfront decisions while the product platform is under development. There is little work that examines these decisions with the added constraint of a preexisting platform. This work proposes a new methodology derived from existing tools that address platform development, specifically, the development of derivative products given the constraints of existing platforms and new opportunities that were not identified during the development of the original platforms. The methodology estimates the impact of making a change in a specific part of the platform in order to integrate new technologies and develop new derivative products, using information theory and coupling indices that capture different aspects of a platform and are combined to extract the most relevant characteristics of each tool. This estimation is fed into a Real Options decision tree model that establishes the value of the opportunity conducting simulations for certain scenarios of markets to pursue...