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Search Results: 1 - 10 of 82524 matches for " Rui Miguel Soares Silva "
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Probabilistic Key Management Practical Concerns in Wireless Sensor Networks
Rui Miguel Soares Silva,Nuno Sidónio A. Pereira,Mário Serafim Nunes
Journal of Networks , 2008, DOI: 10.4304/jnw.3.2.29-37
Abstract: The subject of Key Management in Wireless Sensor Networks has gained increased attention from the security community around the world in the last years. Several proposals were made concerning the peculiarities of resource constrains inherent to sensor devices. One of the most accepted proposals is based on random distribution of keys among the sensor nodes, which was followed by some variants in order to increase its security. In this paper we introduce the mathematical concepts behind this class of proposals through a step-by-step mathematical analysis. This leads to some practical concerns about its applicability to real world applications where the technological constrains strictly compromise the mathematical theoretical models. We demonstrate that the number of communication links needed to assure near 100% network connectivity, is in fact, impractical in nowadays applications.
Partial and Total Ideals of Von Neumann Algebras
Nadish de Silva,Rui Soares Barbosa
Mathematics , 2014,
Abstract: A notion of partial ideal for an operator algebra is a weakening the notion of ideal where the defining algebraic conditions are enforced only in the commutative subalgebras. We show that, in a von Neumann algebra, the ultraweakly closed two-sided ideals, which we call total ideals, correspond to the unitarily invariant partial ideals. The result also admits an equivalent formulation in terms of central projections. We place this result in the context of an investigation into notions of spectrum of noncommutative $C^*$-algebras.
Does 3D Ultrasound Enhance the Diagnosis of Bladder Tumours in Patients with Haematuria?
Miguel Silva-Ramos,Nuno Louro,Rui Versos,Victor Cavadas
ISRN Urology , 2012, DOI: 10.5402/2012/158437
Early Iron Age gold buttons from South-Western Iberian Peninsula. Identification of a gold metallurgical workshop
Monge Soares, António M.,Valério, Pedro,Silva, Rui J. C.,Cerqueira Alves, Luis
Trabajos de Prehistoria , 2010,
Abstract: Early Iron Age gold buttons from Castro dos Ratinhos, Fortios and Outeiro da Cabe a were analysed by conventional EDXRF, Micro-PIXE, SEM-EDS and Optical Microscopy. EDXRF results point out to a rather homogeneous alloy composition throughout all the analysed buttons. PIXE microanalyses show that all the button components (disk, tab and peripheral grooved decorated rod) have the same alloy composition. PIXE and SEM-EDS microanalyses, supplemented with optical microscopy characterization, show the absence of chemical composition differences between distinct components and joining zones, suggesting that no solder had been applied, i.e. that a partial melting/solid state diffusion process had been used for the welding of button components. Finally, the noticeable similar compositions together with the use of the same welding process and the very similar artefact typologies suggest that those small gold treasures could be interpreted as the result of the work of a single metallurgical workshop, probably located somewhere in the South-Western Iberian Peninsula. Botones de oro pertenecientes a la primera Edad del Hierro, procedentes de Castro dos Ratinhos, Fortios e Outeiro da Cabe a (Portugal), fueron analizados por EDXRF y Micro-PIXE. Los resultados de los análisis por EDXRF mostraron una composición similar en todos los botones, independientemente de su procedencia. Por otra parte, los microanálisis por PIXE permitieron verificar que los componentes soldados de cada botón (disco, presilla y cordón exterior) tienen la misma composición química. Además de eso, las áreas de soldadura fueron estudiadas mediante Micro-PIXE, SEM-EDS y posterior análisis metalográfico por microscopia óptica de reflexión. Estos análisis permitieron comprobar la ausencia de soldaduras en las zonas de unión de estos componentes, lo que nos permite concluir que debe haber tenido lugar un proceso de fusión parcial y de difusión en estado sólido para unir los componentes de estos botones. La gran semejanza en la composición química, junto a la presencia del mismo tipo de soldadura y tipologías similares, nos sugiere que todas estas piezas fueron resultado del trabajo de un mismo artesano-joyero, cuyo taller se encontraría localizado en el sudoeste de la Península Ibérica.
Pharmaceutical consultation as a tool to improve health outcomes for patients with type 2 diabetes
Arnaldo Zubioli,Maria Angélica Rafaini Covas Pereira da Silva,Raquel Soares Tasca,Rui Curi
Brazilian Journal of Pharmaceutical Sciences , 2013,
Abstract: This study develops and evaluates a pharmaceutical consultation program (PCP) to improve treatment for Type 2 diabetes patients (T2DP) and reduce risk factors for diabetic complications with possible application in other chronic diseases. We recruited T2DP receiving conventional medical treatment but with fasting glycemia >140mg/dl and/or glycated hemoglobin >7%. The PCP includes strategies obtained from Dader's method, the PWDT (Pharmacist's Workup of Drug Therapy method) model of pharmaceutical care, the SOAP (Subjective data, Objective data, Assessment, and Plan of care) method, and concepts based on a nursing care model. The PCP evaluated lifestyle, pharmacotherapy and monitoring it using laboratory tests, vital signs, and anthropometry. These procedures were repeated every 4 months for 1 year. Data obtained in each consultation were used to provide patient education focusing on healthy lifestyles and medications. Fifty patients completed the PCP. There were reductions in glycemia (P<0.0001), glycated hemoglobin (P=0.0022), cholesterolemia (P=0.0072), triacylglycerolemia (P=0.0204) and blood pressure (P<0.0001). Increased concordance with drug treatment and correction of drug-related problems contributed to improved treatment. We can therefore conclude that our PCP was suitable for improving health outcomes in T2DP by reducing risk factors for diabetic complications. Neste estudo, desenvolvemos e avaliamos um programa de consulta farmacêutica (PCF) visando melhorar o tratamento de pacientes diabéticos tipo 2 (PDT2) e reduzir os fatores de risco de complica es diabéticas com possibilidade de aplica o em outras doen as cr nicas. Para alcan ar este propósito, PDT2 recebendo tratamento médico convencional, apresentando glicemia de jejum > 140 mg/dl e/ou hemoglobina glicada >7% foram selecionados. O PCF inclui estratégias obtidas a partir do método de Dader, do modelo de cuidados farmacêuticos PWDT (Pharmacist's Workup of Drug Therapy method), do método SOAP (Subjective data, Objective data, Assessment, and Plan of care) e conceitos baseados em um modelo de cuidados em enfermagem. O PCF avaliou o estilo de vida, farmacoterapia e seu monitoramento através de exames laboratoriais, sinais vitais e antropometria. Estes procedimentos foram repetidos a cada 4 meses durante 1 ano. Os dados obtidos em cada consulta possibilitaram oferecer educa o focada no estilo de vida e uso de medicamentos. Para os 50 pacientes que concluiram o PCF houve redu o da glicemia (P < 0.0001), hemoglobina glicada (P = 0.0022), colesterolemia (P = 0.0072), triacilgliceridemia (P=
Adrenalectomía transperitoneal laparoscópica: experiencia inicial
Palacios,Alberto; Lima,Estêv?o; Massó,Pedro; Versos,Rui; Autorino,Ricardo; Ramos,Miguel; Soares,José; Marcelo,Filinto;
Archivos Espa?oles de Urología (Ed. impresa) , 2006, DOI: 10.4321/S0004-06142006000900007
Abstract: objetives: since the first published report in 1992, laparoscopic adrenalectomy has been widespread and it is now accepted as the standard treatment option in most of benign diseases of the adrenal gland. aim of the present study is to describe our initial experience with laparoscopic adrenalectomy. methods: between may 2001 and december 2005, 15 patients were submitted to laparoscopic adrenalectomy for benign diseases of the adrenal gland. we analyzed patients characteristics (sex, age, initial diagnosis), operative and perioperative results (operative time, blood loss, time to first oral intake) and complications. results: mean operative time was 143 minutes. blood loss was minimal. mean hospital stay was 90 hours. there was no need for open conversion and complication rate was low. conclusions: laparoscopic surgery of the adrenal gland is a safe and effective option which offers quality of life benefits to the patients.
Síndrome de Brown-Séquard por hérnia discal cervical a duplo nível: caso clínico e revis o da literatura Síndrome de Brown-Séquard por hernia discal cervical en nivel doble: caso clínico y revisión de la literatura Brown-Séquard syndrome by double level cervical disc herniation: case report and review of the literature
Jorge Miguel Silva Ribeiro Olliveira Alves,Paulo Peixoto,Nuno Ferreira,Rui Martins
Coluna/Columna , 2012, DOI: 10.1590/s1808-18512012000300014
Abstract: Descri o do caso clínico de um paciente com síndrome de Brown-Séquard por hérnia de disco cervical em duplo nível, 40 anos, do sexo masculino, sem história de patologia prévia da coluna cervical; teve início insidioso de paresia nos membros direitos, associada à diminui o da sensibilidade dolorosa e térmica do hemicorpo esquerdo, após mergulho que ocasionou trauma indireto da coluna cervical. A RM da coluna cervical mostrou hérnias discais paramedianas direitas nos níveis C4-C5 e C5-C6 com compress o da metade direita do cord o medular e hiperintensidade em T2. Foi realizada descompress o por via anterior e artrodese dos níveis afetados. O paciente recuperou-se parcialmente dos déficits neurológicos, após um longo programa de reabilita o funcional. O tratamento cirúrgico e um programa de reabilita o precoce s o da maior importancia para a recupera o neurológica de paciente com síndrome de Brown-Séquard por hérnia de disco cervical. Descripción del caso clínico de un paciente con síndrome de Brown-Séquard por hernia de disco cervical en nivel doble, 40 a os, del sexo masculino, sin historial de patología previa de la columna cervical; tuvo inicio insidioso de paresia en los miembros derechos, vinculada con la disminución de la sensibilidad dolorosa y térmica del hemicuerpo izquierdo, después de zambullida que ocasionó traumatismo indirecto de la columna vertebral. La RM de la columna cervical mostró hernias discales paramedianas derechas, en los niveles C4-C5 y C5-C6, con compresión de la mitad derecha del cordón medular e hiperintensidad en T2. Se realizó descompresión por vía anterior y artrodesis de los niveles afectados. El paciente se recuperó, parcialmente, de los déficits neurológicos, después de un programa prolongado de rehabilitación funcional. El tratamiento quirúrgico y un programa de rehabilitación precoz son de máxima importancia para la recuperación neurológica del paciente con síndrome de Brown-Séquard por hernia de disco cervical. This article presents a case in which Brown-Séquard syndrome resulted from a double level cervical disc herniation. A 40-year-old man without previous history of cervical pathology, presented with insidious right arm and leg paresis associated with associated with decreased pain and thermal sensitivity in the left hemibody after diving which caused indirect trauma of the cervical spine. Magnetic resonance imaging of the cervical spine showed double level disc herniation in C4-C5 and C5-6 with compression of the right half of spinal cord and hyperintensity in T2-weighted images. After a complete decompressi
Does 3D Ultrasound Enhance the Diagnosis of Bladder Tumours in Patients with Haematuria?
Miguel Silva-Ramos,Nuno Louro,Rui Versos,Victor Cavadas,Filinto Marcelo
ISRN Urology , 2012, DOI: 10.5402/2012/158437
Abstract: Purpose. Bladder cancer is a frequent cause of haematuria in elderly patients, and bladder ultrasound (US) is a valuable tool in diagnosing these malignancies. We examined the accuracy of 3D bladder US in diagnosing bladder tumors in patients with haematuria. Patients and Methods. Twenty-one patients observed in the emergency department for haematuria underwent a kidney and bladder US. Patients with normal or uncertain bladder US findings underwent a 3D US and a cystoscopy. Results. In 5 (23.8%) patients, the 3D US detected bladder tumours not seen in 2D US. All these patients were found to have bladder tumours on cystoscopy. Another 5 (23.8%) patients with uncertain findings on 2D US had normal 3D US and cystoscopy. 3D US showed a sensitivity of 83.3% and a specificity of 100% with a positive predicted value and negative predictive values of 100% and 93.8%, respectively. Conclusion. 3D US was more sensitive than 2D US in diagnosing bladder tumours in patients with haematuria. 1. Introduction Gross haematuria can be a very distressing and frightening symptom and usually leads patients to seek immediate medical care. The cause of haematuria should be thoroughly evaluated and in adults should be regarded as a sign of malignancy until proven otherwise. Ultrasound (US) is one of the initial examinations performed and is very useful in detecting kidney and bladder lesions. The sensitivity of US in detecting bladder tumours (BT) is variably reported to range from 26% to over 80% [1, 2]. However, this rate is much lower in patients with tumours smaller than 5?mm or for tumours located on the bladder dome or anterior wall [2]. Similarly, specificity is decreased in the presence of coexisting focal cystitis, bladder trabeculations, and haematuria with clots. For this reason, a significant number of bladder US are normal or inconclusive, and cystoscopy is necessary to discard the presence of a bladder tumour [3]. Three-dimension US imaging has recently become a widely available feature in many ultrasound machines. This technology permits the acquisition and storage of a dataset, selected from a specific region of interest. This dataset can be further analysed, either by multiplanar display, surface rendering, or volume calculation. As there is a considerable contrast gradient between the bladder lumen and its wall, the surface rendering algorithm can usually display with sufficient detail the surface of the bladder, revealing a cystoscopic-like image, enhancing the characterization of bladder wall abnormalities [4]. In this study, we examined the value of 3D US
Tratamento cirúrgico de recidivas de hérnias discais lombares: que resultados?
Silva, Pedro Alberto Pinto da;Pereira, Paulo Miguel Silva;Pinto, Patrícia Maria Polónia;Vaz, Rui Manuel Cardoso;
Coluna/Columna , 2011, DOI: 10.1590/S1808-18512011000100001
Abstract: objectives: concerning treatment for recurrent lumbar disc herniation, especially in surgery, several aspects remain controversial. this work aims to define preoperative characteristics that influence the subjective and objective results of surgery. methods: we selected patients undergoing surgery for recurrent lumbar disc herniation over a period of ten years; we reviewed the medical records and reassessed the patients subjectively (degree of satisfaction, pain visual analogue scale, stanford score) and objectively (oswestry disability index, zurich questionnaire). a statistical analysis of these data was carried out. results: the total number was 55 patients, predominantly male. the complication rate was 7.3%. eleven patients (20%) needed a third surgery. a large majority (91.5%) of patients said they were satisfied with the surgical treatment. there was a favorable average variation of the oswestry index (-46.27%), confirmed by other scales; 81.6% of active patients resumed previous work activity. significant predictors of functional outcome were found and also the need of a third surgical procedure for the return to work activity. conclusions: surgical treatment for recurrent lumbar disc herniation allows a favorable outcome in symptomatic and functional terms in all tests. some preoperative variables can help predict patients less susceptible to improvement.
Tratamento cirúrgico da rizartrose: trapezectomia com ou sem ligamentoplastia versus prótese total
Santos, Claudia;Pereira, Manuel Alexandre;Silva, Luis Fernando Nunes Pires;Claro, Rui Miguel Teixeira;Trigueiros, Miguel Nuno Albuquerque Cardoso;Silva, Joaquim César Ferreira da;
Revista Brasileira de Ortopedia , 2011, DOI: 10.1590/S0102-36162011000100015
Abstract: objective: the aim of this study was to review cases that underwent surgical treatment using two techniques: trapeziectomy with or without ligamentoplasty and arthroplasty with implant. methods: fifty-two hands that were surgically treated for rhizarthrosis between 1995 and 2008 were evaluated: 32 cases of trapeziectomy with or without ligamentoplasty (group a) and 20 with implant arthroplasty (group b). the mean follow-up for group a was 72 months and for group b, 23 months. there were no significantly different results with regard to pain, activities of daily living, mobility or strength. in the radiographic evaluation, it was found that the scaphometacarpal height was better preserved in group b. the mean time taken to achieve recovery was 10 weeks in group a and 4.5 in group b. four cases with complications were recorded: one case of algoneurodystrophy in group a and two cases of dislocation and one case of fracture of the trapezium in group b. results: the results from prostheses were better than the results from the traditional treatment for rhizarthrosis using trapeziectomy with or without ligamentoplasty because of the rapid recovery that prostheses provide. conclusion: however, prostheses should be applied carefully, because there is a potential for complications relating to the implants.
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