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Ramos, Barbara Couto,da Silva Izar, Bruna Raquel,Pereira, Jessica Lourdes Costa,Souza, Priscilla Sena,Valerio, Claudia Scigliano,Tuji, Fabricio Mesquita,Manzi, Flavio Ricardo Korean Academy of Oral and Maxillofacial Radiology 2016 Imaging Science in Dentistry Vol.46 No.1
Panoramic radiographs are a relatively simple technique that is commonly used in all dental specialties. In panoramic radiographs, in addition to the formation of real images of metal objects, ghost images may also form, and these ghost images can hinder an accurate diagnosis and interfere with the accuracy of radiology reports. Dentists must understand the formation of these images in order to avoid making incorrect radiographic diagnoses. Therefore, the present study sought to present a study of the formation of panoramic radiograph ghost images caused by metal objects in the head and neck region of a dry skull, as well as to report a clinical case in order to warn dentists about ghost images and to raise awareness thereof. An understanding of the principles of the formation of ghost images in panoramic radiographs helps prevent incorrect diagnoses.
Silva, William P P,Stramandinoli-Zanicotti, Roberta T,Schussel, Juliana L,Ramos, Gyl H A,Ioshi, Sergio O,Sassi, Laurindo M Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.11
Objective: This article concerns evaluation of the sensitivity, specificity and accuracy of FNAB for pre-surgical diagnosis of benign and malignant lesions of major and minor salivary glands of patients treated in the Department of Head and Neck Surgery of Erasto Gartner Hospital. Methods: This retrospective study analyzed medical records from January 2006 to December 2011 from patients with salivary gland lesions who underwent preoperative FNAB and, after surgical excision of the lesion, histopathological examination. Results: The study had a cohort of 130 cases, but 34 cases (26.2%) were considered unsatisfactory regarding cytology analyses. Based on the data, sensitivity was 66.7% (6/9), specificity was 81.6% (71/87), accuracy was 80.2% (77/96), the positive predictive value was 66,7% (6/9) and the negative predictive value was 81.6% (71/87). Conclusion: Despite the high rate of inadequate samples obtained in the FNAB in this study the technique offers high specificity, accuracy and acceptable sensitivity.
Fernando Ramos-Quintana,Victor Hugo Zarate-Silva,Juan Alvarez 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2005 International Journal of Assistive Robotics and Me Vol.6 No.2
This paper describes an initiative to introduce mechanisms oriented to create motivational attitudes for developing applied research in the undergraduate level, instead of focusing such efforts only in the graduate level. An important part of these efforts are carried out under the framework of several robotics projects, in particular walking robots and simulated and real soccer robots. Along with this, a curriculum to assure long term technical goals has been specially designed. Thus, the projects should provide the necessary ingredients to encourage the students to develop autonomous behaviors and maintain persistent motivational attitudes by interacting with attractive technical challenges.<BR> We have adopted formal learning models that help to develop cognitive skills for solving problems, such as Problem Based Learning (PBL). In a first step, during four semesters of the years 2002 and 2003, the PBL model, along with projects in soccer robots, has been applied in the undergraduate and graduate level. Since 2004 these efforts have been focused on the undergraduate level. And, we have already witnessed some key results; the students have acquired interesting motivational attitudes in applied research projects in robotics; they have developed cognitive skills for solving problems; and they have got successful participations in international robotics competitions.
Influence of the Adhesive, the Adherend and the Overlap on the Single Lap Shear Strength
da Silva, Lucas F.M.,Ramos, J.E.,Figueiredo, M.V.,Strohaecker, T.R. The Society of Adhesion and Interface 2006 접착 및 계면 Vol.7 No.4
The single lap joint is the most studied joint in the literature in terms of both theory and practice. It is easy to manufacture and the lap shear strength is a useful value for strength assessment and quality control. Simple design rules exist such as the one present in standard ASTM 1002 or in a recent paper by Adams and Davies. The main factors that have an influence on the lap shear strength are the type of adhesive, i.e. ductile or brittle, the adherend yield strength and the overlap length. The overlap increases the shear strength almost linearly if the adhesive is sufficiently ductile and the adherend does not yield. For substrates that yield, a plateau is reached for a certain value of overlap corresponding to the yielding of the adherend. For intermediate or brittle adhesives, the analysis is more complex and needs further investigation. In order to quantify the influence of the adhesive, the adherend and the overlap on the lap shear strength, the experimental design technique of Taguchi was used. An experimental matrix of 27 tests was designed and each test was repeated three times. The influence of each variable could be assessed as well as the interactions between them using the statistical software Statview. The results show that the most important variable on the lap shear strength is the overlap length followed by the type of adherend.
Bárbara Couto Ramos,Bruna Raquel da Silva Izar,Jéssica Lourdes Costa Pereira,Priscilla Sena Souza,Claudia Scigliano Valerio,Fabrício Mesquita Tuji,Flávio Ricardo Manzi 대한영상치의학회 2016 Imaging Science in Dentistry Vol.46 No.1
Panoramic radiographs are a relatively simple technique that is commonly used in all dental specialties. In panoramic radiographs, in addition to the formation of real images of metal objects, ghost images may also form, and these ghost images can hinder an accurate diagnosis and interfere with the accuracy of radiology reports. Dentists must understand the formation of these images in order to avoid making incorrect radiographic diagnoses. Therefore, the present study sought to present a study of the formation of panoramic radiograph ghost images caused by metal objects in the head and neck region of a dry skull, as well as to report a clinical case in order to warn dentists about ghost images and to raise awareness thereof. An understanding of the principles of the formation of ghost images in panoramic radiographs helps prevent incorrect diagnoses.
Santos Ingrid Garcia,Ramos de Faria Fernanda,da Silva Campos Marcio José,de Barros Beatriz Álvares Cabral,Rabelo Gustavo Davi,Devito Karina Lopes 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.2
Purpose: The objective of this study was to assess the fractal dimension, lacunarity, trabecular microarchitecture parameters, and cortical linear measurements in the mandibles of male and female individuals to identify differences between them. Materials and Methods: In total, 116 cone-beam computed tomography scans of healthy individuals of different ages (57 men and 59 women, aged between 20 and 60 years) were selected. The following bone parameters were measured: 1) buccal, lingual, and basal cortical bone thickness in 5 standard parasagittal sections (the midline, the left and right sides of the lower lateral incisors, and the left and right sides of the lower canines); 2) the bone volume fraction of 10 sequential axial sections from each patient by creating a volume of interest in the area between the lower canines; and 3) fractal dimension and lacunarity using grayscale images of the same region of the volume of interest in the anterior mandible. Spearman correlation coefficients and the Mann-Whitney test were used. Results: A significant and positive correlation was found between age and cortical thickness, especially in the region of the central incisors. Significant differences between sexes in terms of fractal dimension, lacunarity, and bone volume were found. Women revealed lower fractal dimension values and higher lacunarity and bone volume ratio values than men. Conclusion: Fractal dimension, lacunarity, trabecular bone volume, and cortical thickness were different between men and women of different ages.
On the rate of convergence of uniform approximations for sequences of distribution functions
João Lita da Silva,Luís Pedro Ramos 한국통계학회 2014 Journal of the Korean Statistical Society Vol.43 No.1
In this paper, we develop uniform bounds for the sequence of distribution functions ofg(Vn + μn), where g is some smooth function, {Vn, n ≥ 1} is a sequence of identicallydistributed random variables with common distribution having a bounded derivative and{μn} are constants such that μn → ∞. These bounds allow us to identify a suitablesequence of random variables which is asymptotically of the same type of g(Vn + μn)showing that the rate of convergence for these uniform approximations depends on theratio of the second derivative to the first derivative of g. The corresponding generalizationto the multivariate case is also analyzed. An application of our results to the STATIS-ACTmethod is provided in the final section.
Patricia Garcia da Silva,Luana Martins Schaly Oliveira,Nayanne Rodrigues de Oliveira,Fabio Ataides de Moura Junior,Maura Regina Sousa Silva,Deibity Alves Cordeiro,Cibele Silva Minafra,Fabiana Ramos do 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.1
Objective: This study aimed to assess the effect of pelleted and expanded sorghum-based feeds prepared with different moisture levels and particle size of ingredients on metabolizable energy, ileal digestibility of amino acids and broiler performance. Methods: The experiment was performed with 720 male broiler chicks of the Cobb strain, with treatments of six replications, with 15 birds each; they were arranged in a completely randomized design and 2×2×2 factorial scheme (pelleted or expanded feed processing, 0.8% or 1.6% moisture addition in the mixer, and particle size of 650 or 850 microns). Results: Higher pellet quality (pellets, % and pellet durability index [PDI]) was obtained in expanded diets and inclusion of 1.6% moisture. The particle size of 850 microns increased the PDI of final diet. All studied treatments had no significant effect on weight gain and broiler carcass and cut yields. Lower feed conversion occurred for birds fed pelleted feed at 42 d. The highest apparent metabolizable energy (AME) and apparent metabolizable energy corrected to zero nitrogen balance (AMEn) values of feed in the initial rearing phase (10 to 13 days) were observed in birds fed pelleted feed or for feed prepared with 1.6% moisture. The highest ileal digestibility coefficients of amino acids were obtained with the consumption of pelleted feed prepared with a particle size of 650 microns and 1.6% moisture. Conclusion: Pelleted feed prepared with a milling particle size of 650 microns and 1.6% moisture provided increased ileal digestibility of amino acids and AMEn in the starter period. However, the expanded feed improved pellet quality and feed conversion of broilers at 42 days of age. We conclude that factors such as moisture, particle size and processing affect the pellet quality, and therefore should be considered when attempting to optimize broiler performance.