Three Dimensional Research Papers - Academia.edu (original) (raw)

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- Physics, Homogenization, High Frequency, Classical Physics
- by Juan C Miñano
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- Mechanical Engineering, Optics, Ray Tracing, Applied Optics
- by Andrei Shkel and +2
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- Silicon Wafer, Three Dimensional
- by Charles Watters
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- Sociology, Psychiatry, Anthropology, Social Policy
- by Douglas Loy
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- Sol Gel Process, CHEMICAL SCIENCES, Three Dimensional, Chemical Properties
- by Emeka Nkenke
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- Dentistry, Nonparametric Statistics, Cleft Palate, Face
- by David Mason
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- Mechanical Engineering, Chemical Engineering, Two Phase Flow, Powder technology

This paper presents a model for the three-dimensional (3D) dynamic response of endmills while considering the actual fluted cross-sectional geometry and pretwisted shape of the tools. The model is solved using the spectral-Tchebychev (ST) technique. The bending and the coupled torsional-axial behavior of four different fluted endmills is compared to finite element model (FEM) predictions and experimental results obtained using modal testing under free-free boundary conditions. For the first eight modes, including six bending and two torsional/axial modes, the difference between the 3D-ST and experimental natural frequencies is shown to be 3% or less for all four tools tested during this study. For the same modes, the 3D-ST and FEM predictions agree to better than 1%. To demonstrate its application, the 3D-ST model for the fluted section of a commercial endmill is coupled to the spindle–holder to predict the tool-point dynamics using receptance coupling substructure analysis (RCSA) with a flexible connection. The coupled model is validated through experiments.► Models for 3D dynamics of endmills, with actual cross-sectional geometry and twist are presented. ► Spectral-Tchebychev technique is used for deriving the tool models. ► Extended receptance coupling substructure analysis technique is integrated. ► Predicted tool tip response is validated with experiments.

- by O. B. Ozdoganlar and +3
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- Modal Analysis, Manufacturing Engineering, Natural Frequency, Finite Element Model
- by Stacey Kessler and +1
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- Marketing, Psychology, Cognitive Science, Applied Social Psychology
- by victoria pavlou
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- Creativity, Child Development, Art and Design Education, Three Dimensional
- by Pawel Pazera
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- Dentistry, Dental Implants, Computer assisted orthopaedic surgery, Humans
- by Michel Cara
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- East Africa, Multidisciplinary, Mid Ocean Ridge, Continental Tectonics
- by Tomislav Suligoj
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- Low Cost Technology, Silicon on Insulator, Silicon Oxide, Silicon Wafer
- by Tony Schmitz
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- Engineering, Technology, Physical sciences, Three Dimensional
- by Mohini Sain
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- Engineering, Kinetics, Modeling, Heat Transfer
- by Håkan Ahlström
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- Magnetic Resonance Imaging, Evaluation, Humans, Image Reconstruction

A method is presented for the recovery of optical flow. The key idea is that the local spatial structure of optical flow, with the exception of surface boundaries, is usually rather coherent and can thus be appropriately approximated by a linear vector field. According to the proposed method, the optical flow components and their first order spatial derivatives are computed

- by alessandro verri
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- Mathematics, Computer Science, Computer Vision, Linear Algebra
- by Bruno Maresca
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- Biology, Macrophages, Medicine, Humans
- by Meheboob Alam
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- Engineering, Shock Waves, Mathematical Sciences, Physical sciences
- by Philippe Bekaert
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- Information Systems, Computer Science, Motion Capture, Real Time
- by Chineng Mo
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- Materials Science, Field emission, Numerical Simulation, Current Density
- by Aeid Abdulrazeg
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- Materials Science, Finite Element, Multidisciplinary, Finite Element Analysis
- by Joris C R Van Acker
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- Materials Engineering, Materials Science, Image Processing, X-ray imaging

Three dimensional object extraction and recognition (OER) from LIDAR data has been an area of major interest in photogrammetry for quite a long time. However, most of the existing methods for automatic object extraction and recognition from LIDAR data are just based on the range information and employ parametric methods and object’s vagueness behaviour is basically neglected. Thus, these methods do not take into account the extraction and recognition complexities and may fail to reach a satisfied reliability level in complex situations. In this paper a novel approach based on the following strategies is formulated and implemented: (a) for a more comprehensive definition of the objects, information fusion concept is utilized, i.e., object’s descriptive components such as 3D structural and textural (ST) information are automatically extracted from first/last rang and intensity information of LIDAR data and simultaneously fed into the evaluation process, (b) for a more realistic expres...

- by Farhad Samadzadegan
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- Fuzzy Logic, Recognition, LiDAR, Region growing
- by George Barakos
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- Engineering, Computation Fluid Dynamics, Aircraft, Three Dimensional

... School of Engineering Springfield, Massachussetts Drag Reduction and Wake Minimization on Marine Vehicles ,,P. ,3 1991 By: , Craig A. Hunter Pasquale Delore Walter M. Presz, Jr. Final Report Office of Naval Research Grant... more

- by Walter Presz
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- Control, Fluid Dynamics, Mixing, Models
- by Edward Araujo Júnior
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- Ultrasound, Adolescent, Fetal development, Pregnancy
- by roy Butterfield
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- Civil Engineering, Geotechnique, Three Dimensional, Géotechnique
- by Kostadin Ivanov
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- Kinetics, Parallel Processing, Level Of Detail (LOD), Nuclear power
- by Ben Ausdenmoore
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- Neuroscience, Cognitive Science, Algorithms, Image Analysis
- by Bálint Kiss
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- Mechanical Engineering, Motion Planning, Robotic, Mechanical systems
- by Laurent Mugnier
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- Mechanical Engineering, Computer Vision, Image Analysis, Optical Flow
- by franco quercioli
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- Optics, Medical Imaging, Fiber Optics, Telecommunications
- by Vesa Välimäki
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- Engineering, Computational Complexity, Mesh generation, Optimization
- by Joohwan Kim
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- Mechanical Engineering, Electrochemistry, Liquid Crystals, Polymers
- by luca businaro
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- X Rays, Three Dimensional, Electrical And Electronic Engineering
- by Mark Lessard
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- EM, Electron Tomography, Mitochondria, Confocal Microscopy
- by andy jones
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- Climate Change, Multidisciplinary, Nature, Climate Model

This paper deals with the theoretical analysis of ultra refraction properties of slab photonic crystals. Strong angular dispersions induced by wavelength variations have been experimentally observed near the Γ–M and Γ–K directions around λ = 1320 nm with negative and positive signs, respectively. An interpretation of these phenomena using three-dimensional plane wave method (3D-PWM) and finite-difference time-domain (3D-FDTD) calculations is presented. Equifrequency surfaces are obtained from PWM calculations and group velocities of Bloch waves excited in the patterned medium are predicted as a function of the incident wave wavelength and wavevector orientation. FDTD calculations have been performed to evaluate the influence of the finite size of the structure and to estimate the photonic crystal coupling losses for various configurations. This theoretical approach allows identifying Bloch waves responsible for the observed properties.

- by Andreea Lupu
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- Photonic Crystal, Silicon on Insulator, Theoretical Analysis, Optical physics
- by Adam Curtis and +1
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- Photography, Electron Microscopy, Biomaterials, Tissue Engineering
- by Yoshinari Kameda
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- Motion estimation, Human Body, Three Dimensional, Image Sequence
- by Luc Avérous and +1
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- Engineering, Electron Microscopy, Image Analysis, Scanning Electron Microscopy
- by Philip Muscarella
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- Earth Sciences, Algorithms, Forecasting, Data Assimilation
- by Enrico Spacone
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- Engineering, Mechanical Engineering, Materials Science, Structural Engineering
- by Steve Curtis
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- Engineering, Genetics, Artificial Intelligence, Control Theory

— Today’s growing number of security threats to computers and networks also increase the importance of log inspections to support the detection of possible breaches. The investigation and assessment of security incidents becomes more and more a dai-ly business. Further, the manual log analysis is essentially in the context of developing signatures for intrusion detection systems (IDS), which allow for an automated defense against security attacks or incidents. But the analysis of log data in the context of fo-rensic investigations and IDS signature development is a tedious and time-consuming task, due to the large amount of textual data. Moreover, this task requires a skilled knowledge to differentiate between the important and the non-relevant information. In this paper, we propose an approach for log resp. audit data representation, which aims at simplifying the analysis process for the secu-rity officer. For this purpose audit data and existing relations between audit events are ...

- by Sebastian Schmerl
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- Computer Science, Computer Forensics, Data Analysis, Computer Security