Institut supérieur de l'aéronautique et de l'espace

About: Institut supérieur de l'aéronautique et de l'espace is a based out in . It is known for research contribution in the topics: Mars Exploration Program & Seismometer. The organization has 445 authors who have published 644 publications receiving 8049 citations. The organization is also known as: ISAE SUPAERO & National Higher French Institute of Aeronautics and Space.

Study into causes of damage to carbon epoxy composite material during the drilling process

Abstract: There is increasing interest from industry in the machining of composite materials, especially the drilling of thick composite panels and of multi-material assemblies. Damage to laminates due to drilling has an influence on the resistance of plates to the various stresses applied to the structure. The present paper aims firstly to highlight the different defects generated by drilling thick carbon epoxy plates at the entry, on the wall and on the whole exit. Following this, the main aim of this work is the observation in the real time of the initiation and the propagation of such defects. This enables to understand and to show the causes of these defects and then allow operating procedures to be proposed that are likely to reduce such damage.

Moving Average Convergence Divergence Filter Preprocessing for Real-Time Event-Related Peak Activity Onset Detection : Application to fNIRS Signals

Abstract: Real-time solutions for noise reduction and signal processing represent a central challenge for the development of Brain Computer Interfaces (BCI). In this paper, we introduce the Moving Average Convergence Divergence (MACD) filter, a tunable digital passband filter for online noise reduction and onset detection without preliminary learning phase, used in economic markets analysis. MACD performance was tested and benchmarked with other filters using data collected with functional Near Infrared Spectoscopy (fNIRS) during a digit sequence memorization task. This filter has a good performance on filtering and real-time peak activity onset detection, compared to other techniques. Therefore, MACD could be implemented for efficient BCI design using fNIRS.

Learning from Concept Mapping and Hypertext: An Eye Tracking Study.

Abstract: Introduction Hypertexts are non-linear documents providing free access to different text sections by clicking on hyperlinks. Learning from hypertexts relies on comprehension processes that consist in establishing coherence between the consulted sections and constructing a mental representation of the overall semantic organization (Foltz, 1996). Selecting text sections by clicking on hyperlinks, maintaining coherent reading paths and extracting a structure of hypertext materials can be very demanding and imposes additional processes that could hamper the relevant processes of comprehension (Antonenko & Niederhauser, 2010; DeStefano & LeFevre, 2007; Niederhauser, Reynolds, Salmen, & Skolmoski, 2000). Pre-structured concept maps are relevant guiding tools for learners because they are explicit spatial overviews of the contents' semantic organization and may thus limit learners' disorientation (for a review see Amadieu & Salmeron, 2014). While pre-structured concept maps limit some ineffective cognitive processes, they do not promote deep and active elaboration processes based on prior background knowledge. For instance, learners are less active and tend to navigate passively, respecting the structure imposed by the pre-structured map (Amadieu, van Gog, Paas, Tricot, & Marine, 2009). Concept mapping can be seen as an alternative to pre-structured maps. Concept mapping requires that learners structure themselves a spatial overview of the semantic organization. Learners have to identify the main concepts from learning materials, and to organize them in a coherent manner by creating a spatial arrangement of concepts and links between the concepts to indicate the semantic relations. Coherence formation in learning from concept mapping is similar to coherence formation in learning from multiple representations, which requires the local structure of a single representation to be processed (intra-representational or local coherence formation) and to integrate the different representations (inter-representational or global coherence formation) to construct a deep understanding of the contents (Seufert, 2003). Global coherence formation is often considered as being an active learning task supporting elaboration (Karpicke & Blunt, 2011). Even though concept mapping is theoretically efficient for learning, empirical results are not clear cut (Hilbert & Renkl, 2009; Redford, Thiede, Wiley, & Griffin, 2012; Stull & Mayer, 2007) and the efficiency of this learning task seems to depend on several factors such as addition of heuristic examples (Hilbert & Renkl, 2009), or learners' perceptions toward concept mapping (Tseng, Chang, Lou, Tan & Chiu, 2012). Because concept mapping frequently implies both building of a map and reading of textual material and because learners have to manage these two tasks, the temporal organization of the learning sequence including mapping and reading merits being studied. Therefore, designing an instruction that imposes a specific sequence, i.e., processing textual material first vs. constructing a concept map first, could lead to different learning performance. This point was investigated in the current study in a hypertext-learning environment. A second factor considered in the present study was prior domain knowledge that can support both concept mapping and hypertext reading. The study investigated the on-line processes underpinning concept mapping with a hypertext. Cognitive requirements of concept mapping: extraneous or germane cognitive processing? Concept mapping may not be as efficient for learning as expected (e.g., Redford, Thiede, Wiley, & Griffin, 2012) and may even turn the learner away from learning (Stull & Mayer, 2007). Indeed, Stull and Mayer (2007) showed that concept mapping could impair content integration in contrast to studying already completed concept maps. The activity of constructing concept maps may induce extraneous processing, leaving less resources in working memory for essential processing. …

Flight trial demonstration of seamless aeronautical networking

Abstract: This article presents the in-flight demonstration of a new integrated aircraft communications system combining legacy and future radio technologies. This system, developed and validated under real environmental conditions during flight trials, integrates all the aeronautical service domains within a common IPv6-based aeronautical network. The flight trials were held within the framework of the European SANDRA project at Oberpfaffenhofen, Germany, in June 2013. The presented outcomes emphasize the flexibility and scalability of the developed network and demonstrate the seamless service coverage of the given architecture across different airspace domains.