This study was conducted to determine the indications, safety, efficacy, and complication rate associated with performing corpectomy achieve anterior decompression of neural elements or for removing lesions.Between 1987 1998, 185 patients underwent cervical treatment degenerative spondylitic disease (81 cases), ossification posterior longitudinal ligament (16 correction postoperative kyphosis (31 trauma (39 tumor (10 infection (eight cases). Ninety-nine presented myelopathy, 48...

Heterotopic pregnancy is defined as intrauterine and extrauterine entity coexisting simultaneously which has been on the rise in recent years with development of assisted reproductive techniques. We report 4 cases heterotopic pregnancy, three them resulting from technologies a spontaneous case. also describe methods used for diagnosis, therapies behavior perinatal outcome.

Many scientific and engineering applications require to perform a large number of arithmetic operations that must be computed in an efficient manner using high precision dynamic range. Commonly, these are implemented on personal computers taking advantage the floating-point computations operational frequencies. However, most common software architectures execute instructions sequential way due von Neumann model and, consequently, several delays introduced data transfer between program memory...

This work presents an architecture to compute matrix inversions in a hardware reconfigurable FPGA with single-precision floating-point representation, whose main unit is the processing component for Gauss-Jordan elimination. consists of other smaller arithmetic units, organized maintain accuracy results without need internally normalize and de-normalize data. The implementation operations whole take advantage resources available Virtex-5 FPGA. performance resource consumption are...

This study describes a transversal (TV) ultrasound-guided erector spinae plane (ESP) block technique over the transverse process of T12. And evaluates distribution dye and affected nerves branches compared to longitudinal (LNG) approach T12 in canine cadavers. Secondly, it also compares de anatomy dimensions processes with T9 T5. For this double-masked, cadaveric experimental study, 12 adult Beagle cadavers were injected 0.6 mL/kg dye/contrast. Spread was evaluated by computed tomography...

Computation of floating-point transcendental functions has a relevant importance in wide variety scientific applications, where the area cost, error and latency are important requirements to be attended. This paper describes flexible FPGA implementation parameterizable library for computing sine, cosine, arctangent exponential using CORDIC algorithm. The novelty proposed architecture is that by sharing same resources algorithm can used two operation modes, allowing it compute cosine or...

Currently, both the market and academic communities have required applications based on image video processing with several real-time constraints. On other hand, detection of moving objects is a very important task in mobile robotics surveillance applications. In order to achieve an alternative design that allows for rapid development real time motion systems, this paper proposes hardware architecture background subtraction algorithm, which implemented FPGAs (Field Programmable Gate Arrays)....

Particle Swarm Optimization (PSO) algorithms have been proposed to solve engineering problems that require find an optimal point of operation. There are several embedded applications which requires online optimization with a high performance. However, the PSO suffers on large execution times, and this fact becomes evident when using Reduced Instruction Set Computer (RISC) microprocessors in operational frequencies low comparison traditional personal computers (PCs). This paper compares two...

High computational cost for solving large engineering optimization problems point out the design of parallel algorithms. Population based algorithms provide capabilities that can be explored by their implementations done directly in hardware. This paper presents a hardware implementation Particle Swarm Optimization using an efficient floating-point arithmetic which performs computations with high precision. All architectures are parameterizable bit-width, allowing designer to choose suitable...

For complex new product development (NPD) projects, traditional planning techniques have failed in realistic planning. Consequently, project performance has poor results, despite the dissemination of management knowledge. This research aims to investigate relationship between complexity and team seniority as parameters for NPD project, exploring effect on performance. The applies a system dynamics model simulating influence these performance, particularly relating schedule scope dimensions....

Floating-point operations are an essential requisite in a wide range of computational and engineering applications that need good performance high precision. Current advances VLSI technology raised the density integration fast enough, allowing designers to develop directly hardware several floating-point commonly implemented software. Until now, most research has not focused on tradeoff among cost size logic area, associated with level precision, parameters very important variety such as...

This paper shows the hardware implementation of a sensor fusion technique applied to both an ultrasonic and infrared sensors, for estimating distance, using FPGA. Sensor is natural application stochastic filtering area (such as Kalman filters), being extensively in different areas such mobile robotics, signal processing, bioengineering, among others. permits combine information provided by improving estimate measured variable, well its uncertainity. The sensors have previously been...

This work describes a hardware architecture for implementing sequential approach of the Extended Kalman Filter (EKF) that is suitable mobile robotics tasks, such as self-localization, mapping, and navigation problems. As algorithm computationally intensive, commonly it implemented in Personal Computer (PC)-based platform to be employed on larger robots. In order allow development small robotic platforms, those required many current state art research (for instance microrobotics area), size,...

This paper presents and discusses the results of an ongoing R&D project aiming to design build a fully automated prototype specialized spherical robotic welding system for repairing hydraulic turbine surfaces eroded by cavitation pitting and/or cracks produced cyclic loading. The has embedded vision sensor built acquire range images laser scanning over blade's surface produce 3D models locate damaged spots be registered in coordinate into robot controller, enabling repair flaws...