ABSTRACT
In vehicular ad hoc networks (VANets), a precise localization system is a crucial factor for several critical safety applications. The global positioning system (GPS) is commonly used to determine the vehicles' position estimation. However, it has unwanted errors yet that can be worse in some areas, such as urban street canyons and indoor parking lots, making it inaccurate for most critical safety applications. In this work, we present a new position estimation method called cooperative vehicle localization improvement using distance information (CoVaLID), which improves GPS positions of nearby vehicles and minimize their errors through an extended Kalman filter to execute Data Fusion using GPS and distance information. Our solution also uses distance information to assess the position accuracy related to three different aspects: the number of vehicles, vehicle trajectory, and distance information error. For that purpose, we use a weighted average method to put more confidence in distance information given by neighbors closer to the target. We implement and evaluate the performance of CoVaLID using real-world data, as well as discuss the impact of different distance sensors in our proposed solution. Our results clearly show that CoVaLID is capable of reducing the GPS error by 63%, and 53% when compared to the state-of-the-art VANet location improve (VLOCI) algorithm.
ABSTRACT
To boost active learning in undergraduate students, they were given the task of preparing blogs on topics of clinical biochemistry. This "experiment" lasted for 12 teaching-semesters (from 2008 to 2013), and included a survey on the blogs' usefulness at the end of each semester. The survey (applied in the 2008-2010 period) used a Likert-like questionnaire with eight questions and a 1-to-6 scale, from "totally disagree" to "fully agree." Answers of 428 students were analyzed and indicated overall approval of the blog activity: 86% and 35% of the responses scored 4-to-6 and 6, respectively. Considering the survey results, the high grades obtained by students on their blogs (averaging 8.3 in 2008-2010), and the significant increase in average grades of the clinical biochemistry exam after the beginning of the blog system (from 5.5 in 2007 to 6.4 in 2008-2010), we concluded that blogging activity on biochemistry is a promising tool for boosting active learning. © 2016 by The International Union of Biochemistry and Molecular Biology, 45(3):205-215, 2017.
Subject(s)
Biochemistry/education , Blogging , Education, Medical, Undergraduate , Problem-Based Learning , Students/statistics & numerical data , Biochemistry/classification , Humans , Internet , Surveys and QuestionnairesABSTRACT
Defeitos anatômicos no rebordo alveolar são problemas estéticos comuns na Odontologia. Existem modalidades de tratamentos que se destinam a re-solver esses problemas. E entre eles o enxerto de matriz dérmica acelular. Esse trabalho tem o objetivo de mostrar, através de relato de caso clínico, um enxerto de matriz dérmica acelular (Alloderm) em um paciente que apresentava defeito alveolar na região anterior da maxila. Concluímos que a matriz dérmica acelular pode ser usada para resolver problemas estéticos com sucesso.
Anatomics defects on alveolar ridge are commons esthetics problems in dentistry. There are treatment's modalities that try to resolve them, between theses there is accelular dermal matrix graft. This work has the purpose to show, throught a case relate, an accelular dermal matrix graft (Alloderm) in a patient that presents an alveolar defect on anterior region af maxilla. We concluded that accelular dermal matrix can be used to resolve esthetic problems successfully.
Subject(s)
Humans , Male , Adult , Acellular Dermis , Esthetics, Dental , Surgery, Oral , Tissue TransplantationABSTRACT
En la actualidad una de las cirugías más populares para miopía alta es el procedimiento de Lasik, en la cual, la capa de Bowman es preservada. Nosotros estudiamos 9 ojos de 8 pacientes con ultrasonido biomicroscópico a quienes se les realizó la técnica de Lasik. Todos los pacientes fueron mayores de 20 años de edad, con un equivalente esférico promedio de -9.69 dioptrías. A la exploración con ultrasonido biomicroscópico las características de la córnea fueron similares tanto en el examen pre y postoperatorio, el grosor corneal promedio preoperatorio fue de 562 micras y en el post operatorio de 470 micras, la profundidad de la cámara anterior no presentó cambios significativos. La profundiad de la ablación promedio calculada en el preoperatorio fue de 90 micras y en post operatorio fue de 74 micras