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Selecting regions of interest for the diagnosis of alzheimer's disease in brain SPECT images using welch's t-test

10th International Work-Conference on Artificial Neural Networks, IWANN 2009

作者： Salas-Gonzalez, D. Górriz, J.M. Ramírez, J. López, M. Álvarez, I. Segovia, F. Puntonet, C.G. Dept. of Signal Theory Networking and Communications University of Granada Granada 18071 Spain Dept. of Computer Architecture and Computer Technology University of Granada Granada 18071 Spain

ISBN: (纸本)3642024777

This paper presents a computer-aided diagnosis technique for the diagnosis of Alzheimer type dementia. The proposed methodology is based on the selection of voxels which present a Welch's t-test between both classes, Normal and Alzheimer images, greater than a given value. The mean and standard deviation of intensity values are calculated for selected voxels. They are chosen as feature vectors for two different classifiers: support vector machines with linear kernel and classification trees. The proposed methodology reaches an accuracy greater than 98 % in the classification task. © 2009 Springer Berlin Heidelberg.

关键词： computer aided diagnosis

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computer aided diagnosis of alzheimer disease using support vector machines and classification trees

Computer aided diagnosis of alzheimer disease using support ...

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15th International Conference on Neuro-Information Processing, ICONIP 2008

ISBN: (纸本)3642030394

This paper presents a computer-aided diagnosis technique for improving the accuracy of the early diagnosis of the Alzheimer type dementia. The proposed methodology is based on the combination of support vector machine learning with linear kernels and classification trees. The classification tree technique allows to choose wisely the most discriminant set of voxels in the images. Thus, the classification tree produces a considerably improvement upon considering the support vector machine classifier only. © 2009 Springer Berlin Heidelberg.

关键词： computer aided diagnosis

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Selecting regions of interest for the diagnosis of alzheimer using brain SPECT images

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6th International Symposium on Neural Networks, ISNN 2009

作者： Salas-Gonzalez, Diego Górriz, Juan M. Ramírez, Javier Álvarez, Ignacio López, Míriam Segovia, Fermín Puntonet, Carlos G. Dept. of Signal Theory Networking and Communications University of Granada Granada 18071 Spain Dept. of Computer Architecture and Computer Technology University of Granada Granada 18071 Spain

ISBN: (纸本)3642015123

This paper presents a computer-aided diagnosis technique for improving the accuracy of the early diagnosis of the Alzheimer type dementia. The proposed methodology is based on the selection of those voxels which present a greater difference between normals and Alzheimer's type dementia patients. The mean value of the intensities of the selected voxels are used as features for different classifiers. The proposed methodology reaches an accuracy of 89% in the classification task. © 2009 Springer Berlin Heidelberg.

关键词： computer aided diagnosis

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Analysis of brain SPECT images for the diagnosis of alzheimer disease using first and second order moments

Analysis of brain SPECT images for the diagnosis of alzheime...

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3rd International Work-Conference on the Interplay Between Natural and Artificial Computation, IWINAC 2009

作者： Salas-Gonzalez, D. Górriz, J.M. Ramírez, J. López, M. Álvarez, I. Segovia, F. Puntonet, C.G. Dept. of Signal Theory Networking and Communications University of Granada 18071 Granada Spain Dept. of Computer Architecture and Computer Technology University of Granada 18071 Granada Spain

ISBN: (纸本)3642022669

This paper presents a computer-aided diagnosis technique for improving the accuracy of the early diagnosis of the Alzheimer type dementia. The proposed methodology is based on the selection of the voxels which present greater overall difference between both modalities (normal and Alzheimer) and also lower dispersion. We measure the dispersion of the intensity values for normals and Alzheimer images by mean of the standard deviation images. The mean value of the intensities of selected voxels is used as feature for different classifiers, including support vector machines with linear kernels, fitting a multivariate normal density to each group and the k-nearest neighbors algorithm. The proposed methodology reaches an accuracy of 92 % in the classification task. © 2009 Springer Berlin Heidelberg.

关键词： computer aided diagnosis

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A didactic test system for thermal characterization of electric and electronic devices

A didactic test system for thermal characterization of elect...

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3rd International Multi-Conference on Society, Cybernetics and Informatics, IMSCI 2009

作者： Luna-Rodriguez, Juan-J. Santiago-Chiquero, Isabel-P. Garrido-Pacha, Jose-I. Alvarez-Ruiz, Jose-A. Varo-Martinez, Marta Martinez-Jimenez, Pilar Dept. of Computer Architecture Electronics and Electronic Technology Rabanales Campus Leonardo da Vinci Building University of Cordoba 14071-Córdobe Spain Building University of Cordoba 14071-Córdobe Spain

ISBN: (纸本)1934272795

The thermal characterization of electric and electronic devices is an important topic during the training of future electric and electronic engineers, especially in technology subjects. In the industry and accredited laboratories, the thermal tests are carried out with environmental screening process and testing systems into special chambers. However, these test systems are not usually available for didactic purposes due to mainly their acquisition and maintenance cost. Consequently, a new test system for thermal characterization in didactic laboratories has been designed. This new system is simple, intuitive, and economically viable for universities and formation centres. Students, among other aspects, can analyze how temperature affects some specific parameters of various passive and active components. In this work a didactic thermal test system is presented and its use for laboratory practicals in the studies of Industrial Technical Engineering is discussed.

关键词： Thermoelectric equipment

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Parallelization of the nearest-neighbour search and the cross-validation error evaluation for the kernel weighted k-nn algorithm applied to large data dets in matlab

Parallelization of the nearest-neighbour search and the cros...

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2009 International Conference on High Performance Computing and Simulation, HPCS '09

作者： Rubio, Gines Guillen, Alberto Pomares, Hector Rojas, Ignacio Paechter, Ben Glösekötter, Peter Torres-Ceballos, C.I. University of Granada Dept of Computer Architecture and Technology C/ Periodista Daniel Saucedo sn 18071 Granada Spain Centre for Emergent Computing School of Computing Napier University United Kingdom Dept. of Electrical Engineering and CS University of Applied Sciences Muenster Germany

ISBN: (纸本)9781424449071

The kernel weighted k-nearest neighbours (KWKNN) algorithm is an efficient kernel regression method that achieves competitive results with lower computational complexity than Least-Squares Support Vector Machines and Gaussian Processes. This paper presents the parallel implementation on a cluster platform of the sequential KWKNN implemented in Matlab. This implies both the parallelization of the k nearestneighbour search and the evaluation of the crossvalidation error on a large distributed data set. The results demonstrate the good performances of the implementation. © 2009 IEEE.

关键词： Nearest neighbor search

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Shape optimization of shell roofs subjected to strong wind using multigrid method and variable complexity model

Journal of Structural and Construction Engineering

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Journal of Structural and Construction Engineering 2009年第636期74卷 297-304页

作者： Yamashita, Takuzo Kumagai, Tomohiko Ogawa, Toshiyuki Mjyamura, Tomoshi Ohsaki, Makoto Dept. of Archi. and Build. Eng. Tokyo Institute of Technology Japan Dept. of Computer Science College of Engineering Nihon University Japan Dept. of Architecture and Architectural Engineering Kyoto University Japan

Shape optimization of shell roofs subjected to strong wind is camed out to mimmize the maximum vertical displacement. The three dimensional (3D) fluid flow analysis is performed to obtain highly precise dynamic wind load. To reduce the large computational cost of the 3D analysis, the multignd method is employed to solve the pressure Poisson equation. The objective function of the optimization problem is expected to have strong nonlineanty. Employing Response Surface Model (RSM), the objective function is approximated as a smooth function so that computational cost of the optimization is reduced. Analyses for several experimental points are required to generate RSM. It is not practical to perform 3D analyses for all experimental points due to huge computational cost. Vanable Complexity Model (VCM) is useful for generating RSM. VCM is the method combining a high-fidelity model and a low-fidelity model. As the method of generating RSM, two kinds of methods are employed;(1) VCM (2) 3D analyses for all the experimental points. Optimized shapes are obtained by both methods. Although the value of the objective function of (1) is slightly larger than that of (2), the computation for (1) is much faster than that for (2).

关键词： Shape optimization

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In-flight contingency management for unmanned aerial vehicles

In-flight contingency management for unmanned aerial vehicle...

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作者： Pastor, Enric Royo, Pablo Santamaria, Eduard Prats, Xavier Barrado, Cristina Technical University of Catalonia Barcelona Spain Computer Architecture Dept. Avda. del Canal Olímpic 15 08860 Castelldefels Spain Castelldefels School of Technology Avda. del Canal Olímpic 15 08860 Castelldefels Spain

ISBN: (纸本)9781563479717

Contingency analysis and reaction is a critical task to be carried out by any airplane to guarantee its safe operation in a non-segregated airspace. Pilot's reactions to any kind of incidences that may occur in-flight, like engine malfunctions, loss of electrical power, hydraulic failure, unexpected weather, etc, will determine the fate of the flight. Nowadays, contingency reactions are mainly driven by the airplane manufacturer, with pre-analyzed contingency scenarios covered in the airplane documentation, and by ICAO's rules as defined in the way flight plans should be prepared and landing alternatives implemented. Flight dispatching is the set of tasks related to flight preparation, such as load and balance, meteorology study and briefing, operational flight planning, contingency analysis and planning, etc. However, managing contingencies on a UAS is a much more complex problem basically due to the automated nature of the vehicle and the lack of situational awareness that pilot's in command should face. It is well known from the short history of UAS accidents that many of them are directly imputable to pilot errors when trying to manage an unexpected contingency. In this paper we will introduce an structured approach to automate contingency reactions in UAS. Our objective is to classify the contingency sources and up to a certain level abstract their impact on the system operation. Contingencies can be related to four wide aspects of the UAS operation: the flight itself, the mission, the payload, and the awareness systems. depending on the level of severity the contingency reaction may involve changing or canceling mission objectives to canceling the flight itself. In this way, the response to the contingency can be selected from a predefined limited catalog of automated reactions that may reconfigure the UAS operation in all aspects. This structured approximation is only possible because the contingency management is built upon a highly capable architecture call

关键词： Iterative methods

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An architecture for the seamless integration of UAS remote sensing missions

An architecture for the seamless integration of UAS remote s...

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作者： Pastor, E. Barrado, C. Royo, P. Lopez, J. Santamaria, E. Prats, X. Technical University of Catalonia Barcelona Spain Computer Architecture Dept. Avda. del Canal Olímpic 15 08860 Castelldefels Spain Castelldefels School of Technology Avda. del Canal Olímpic 15 08860 Castelldefels Spain

ISBN: (纸本)9781563479717

Unmanned Aerial Systems (UAS) are slowing becoming efficient platforms that can be applied in scientific/commercial remote sensing applications. UAS may offer interesting benefits in terms of cost, exibility, endurance, etc. On the other side, the complexity of developing a full UAS-system is currently limiting its practical application. Currently, only large organizations like NASA or NOAA have enough budget and infrastructure to develop such applications. Nowadays, UAS technology offers feasible technical solutions for airframes, flight control, communications, and a wide set of multi-spectrum sensors. However, the generalized development of remote sensing applications are still limited by the absence of systems that support the development of the actual UAS sensing mission. This paper introduces a flexible and reusable hardware/software architecture designed to facilitate the development of UAS-based remote sensing applications. This exibility is organized into an user-parameterizable UAS Service Abstraction Layer (USAL). The USAL defines a collection of standard services are their interrelations as a basic starting point for further development by users. Functionalities like enhanced flight-plans, a mission control engine, data storage, communications management, etc. are offered. Additional services can be included according to requirements but all existing services and inter-service communication infrastructure can be exploited and tailored to specific needs. The overall USAL architecture is demonstrated by means of a wild land fire remote sensing application currently being developed to support fire fighters in the Mediterranean area. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： NASA

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Mission formalism for UAS based navaid flight inspections

Mission formalism for UAS based navaid flight inspections

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作者： Santamaria, Eduard Pérez, Marc Ramírez, Jorge Barrado, Cristina Pastor, Enric Technical University of Catalonia Barcelona Spain Computer Architecture Dept. Avda. del Canal Olímpic 15 08860 Castelldefels Spain Castelldefels School of Technology Avda. del Canal Olímpic 15 08860 Castelldefels Spain

ISBN: (纸本)9781563479809

In previous work UAS have been proposed as the platform of choice for performing Navaid Flight Inspections. It is expected that the use of these platforms will significantly reduce time and monetary costs, but a number of issues must be addressed for UAS to become a real alternative. An important requirement for flight inspection missions is to minimize their impact on other air traffic. In this paper we focus on provisioning UAS with a level of operational agility comparable to that provided by a human on-board pilot. Planning to avoid conflicts, the unmanned vehicle must be able to momentarily interrupt and later on resume the inspection operations in an automated manner. In this paper we analyze the operational requirements for a specific inspection mission and design a flight plan for its execution. Afterwards, a flight plan specification formalism, that will enable us to perform the inspection mission in a highly automated manner, is presented. Finally, we demonstrate how the flight plan design is translated to a suitable representation using this formalism and how the required operational agility is achieved. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Inspection

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