Infoscience
(66.951 recursos)
Repository of the publications, research reports, PhD Theses, Ms Theses, semester works, lectures, etc., of the Facultés, Laboratories and Researchers at the EPFL.
Mostrando recursos 1 - 20 de 288
1.
SEAM - Wegmann, Alain
Déscription de la méthode SEAM
3.
Pesticide transport in an alluvial plain - Mermoud, A.; Meiwirth, K.
Poster presented at the XXXIst Congress of the French Group of Pesticide, Lyon, May 15-17, 2001
6.
Climate change and hydropower production in the Swiss Alps: quantification of potential impacts and related modelling uncertainties - Schaefli, Bettina; Hingray, Benoît; Musy, André
This paper addresses two major challenges in the field of climate change impact analysis on water resources systems: i) incorporation of the largest possible range of potential climate change scenarios and ii) quantification of related modelling uncertainties. The developed methodology of climate change impact modelling is presented and illustrated through an application to a hydropower plant in the Swiss Alps that uses the discharge of a highly glacierized catchment. The potential climate change impacts are analysed in terms of system performance for the control period (1960 1989) and for the future period (2070 2099) under a range of...
7.
HIGH ASPECT RATIO SiLICON NANOFABRICATION (HARSiN) TECHNOLOGY - Hibert, C; OBrien, J; McCarthy, B; Kelleher, A. M.; ONeill, B.; Hughes, V
A simplified process to fabricate high aspect ratio nanostructures in silicon combining electron beam lithography and deep reactive ion etching (DRIE) is presented. A stable process (HARSiN) has been developed without the need for complicated resist/hard mask processing or complex dry etch technologies. This is achieved using commercially available ZEP520A resist from Nippon Zeon Co., Ltd which allows high resolution ebeam imaging (?50nm) as well as affords high plasma etch resistance to a continuous room temperature carbon/fluorine DRIE Si etch chemistry developed in this work. Using this simplified lithography/etch process sequence, high aspect ratio (>14:1) silicon nanometer structures are reported...
9.
Design and implementation of deformation algorithms for computer assisted orthopedic surgery: application to virtual implant database and preliminary results - Zheng, G; Nolte, LP; Vangenot, C; Di Ventuto, C; Marti, G; Sagbo, S
Fractures around the joints are more common cases in routine trauma surgery where the surgeons have to bend the osteosynthesis plates to fit geometrical boundaries of the specific patient. This is a complicated, time consuming, and technically demanding procedure. The average time for bending a single plate requires as long as twenty minutes. This paper presents the first trial to design and implement the deformation algorithms for computer assisted orthopedic surgery system to assist surgeons in this procedure. Our preliminary results are presented.
10.
Image-guided Surgical Microscope - Caversaccio, M; Pappas, I; Marti, G; Garcia, J
We present an image-guided surgical microscope system using augmented reality image overlays added onto one of the views of the operating microscope. With this system, segmented objects, outlines of risk regions, access pathways or 3D objects, previously extracted from preoperative tomographic images can be directly displayed as augmented reality overlays on the microscope image.
11.
Image-guided Surgical Microscope - Caversaccio, M; Pappas, I; Marti, G; Kowal, J; Malik, P; Garcia, J
We present an image-guided microscope system using augmented reality image overlays added onto one of the views of the operating microscope. With this system, segmented objects, outlines of risk regions or access pathways, previously extracted from preoperative tomographicimages can be directly displayed as augmented reality overlays on the microscope image.
12.
Fast coarse-to-fine elastic registration of medical data - Marti, G
In this work, we present a new approach for the nonrigid registration of medical data. The presented technique can also be applied for modelbased segmentation.
13.
The Effect of Mobility on Cooperation in Ad Hoc Networks - Buttyan, Levente; Hubaux, Jean-Pierre; Felegyhazi, Mark
Ad hoc networks are expected to be used in many different situations. A common characteristic among these situations is that the nodes have to cooperate with each other. This problem is particularly crucial, if each node is its own authority. Reckoning the relevance of this issue, several groups of researchers have proposed different incentive mechanisms, in order to foster cooperation between the nodes, notably for packet forwarding. However, the need for these incentives was not formally justified. In this paper, we address the problem of cooperation without incentive mechanisms and propose a simple model based on game theory. We investigate...
14.
A Power Independent Detection Method for UltraWide Band (UWB) Impulse Radio Networks - El Fawal, Alaeddine; Le Boudec, Jean-Yves
We propose a detection method for pulse level synchronization in the presence of Inter-User Interference (IUI),in particular in the Near-far scenario. Further, we investigate concurrent transmissions using the same time hopping code.
15.
Wireless Operators in a Shared Spectrum - Hubaux, Jean-Pierre; Felegyhazi, Mark
So far, cellular networks have been operated in ``private" frequency bands. But recently, several researchers and legislators have argued in favor of a more flexible and more efficient management of the spectrum, leading to the possible coexistence of several network operators in a shared frequency band. In this paper, we study this situation in detail, assuming that mobile devices can freely roam among the various operators. Free roaming means that the mobile devices measure the signal strength of the pilot signals (i.e., beacon signals) of the base stations and attach to the base station with the strongest pilot signal. We...
16.
Better Relational Queries using For-comprehensions - Dubochet, Gilles
For-comprehensions, an operator to apply expressions on selected elements of sets or lists, can replace most of SQL as a query language. I present my current and future work on integrating for-comprehensions for database access in general-purpose programming languages without compromising on performance.
17.
Optic-flow-based Navigation for Ultralight Indoor Aircraft - Floreano, D.; Zufferey, J.C.
The goal of this project is to develop an autonomous microflyer capable of navigating within houses or small built environments using vision as main source of information. Flying indoor implies a number of challenges that are not found in outdoor autonomous flight. These include small size and slow speed for maneuverability, light weight to stay airborne, low-consumption electronics, and smart sensing and control to fly in textured environment.
18.
Surface micromachining of Ceramic-MEMS based on SU-8 micromoulding of Polyureasilazane - Brugger, J; Fakhfouri, V
Chemical inertness and corrosion resistance make ceramic materials appropriate for Micro Electro-Mechanical Systems (MEMS) when aiming for sensing applications at high temperature or in harsh environment. Besides the usual fabrication techniques, such as powder-injection moulding, applied for macro structures, new methods were recently developed based on the use of liquid precursors for engineering of ceramic MEMS. Microinjection and photopolymerisation of e.g. Polyureasilazane (a precursors for SiC and Si-C-N) has been successfully used to form ceramic microstructures. Here, we describe a novel surface micromachining process based on high-aspect ratio micro-moulds made of SU-8 (thickness: 500um, width: 100-1000um) for lateral structuring of...
20.
Development of actuators using PVDF piezoelectric polymer - Brugger, J; Salvadori, M C; Wiederkehr, R S
Piezoelectricity is the propriety of materials that relates mechanical deformation as a function of applied voltage and vice-versa. The advantage of using these materials as actuators is the fast response and low power consumption when compared with traditional actuators. The piezoelectric polymers are emerging as actuators because they are lightweight, flexible and cheaper then PZT ceramics. But to reach high displacements it is necessary to glue two layers of the material with opposite polarization (bimorph) or bond it with a non piezoelectric surface (unimorph). In this presentation it will be shown a sequence of fabrication of a bimorph actuator using...
1.
