The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform

Mohamed Younis - One of the best experts on this subject based on the ideXlab platform.

  • A Cognitive Scheme for gateway protection in wireless sensor network
    Applied Intelligence, 2008
    Co-Authors: Waleed Youssef, Mohamed Younis
    Abstract:

    In wireless sensor networks, sensor readings are gathered at a gateway for processing and forwarding to a remote command center. The potential closeness of the gateway to dangerous events, e.g. fires, exposes it to damage and thus risks making the network dysfunctional. Therefore, protecting the gateway by repositioning it away from safety-hazardous spots is critical for the operation of the network. However, moving the gateway too far from the sensors that report on active events would have negative effect on the network performance, e.g. throughput and energy consumption. Therefore, balancing the gateway safety and network performance goals will be necessary. In this paper, we present GRISP, a novel Gateway Relocation algorithm for Improved Safety and Performance. GRISP employs an evolutionary neural network model to assess the safety of the gateway at the various locations. The model is then used to direct the search in an area of interest for a safer position that would enhance or at least maintain an acceptable level of network performance. In addition, GRISP guides the gateway during the move by finding safe paths leading to the new location. Our experimental validation results demonstrate the effectiveness of GRISP.

Jean-pierre Desclés - One of the best experts on this subject based on the ideXlab platform.

  • FLAIRS Conference - Reasoning in Natural Language in using Combinatory Logic and Topology An example with aspect and temporal relations
    2010
    Co-Authors: Jean-pierre Desclés
    Abstract:

    We are studying how Curry’s Combinatory Logic can be used for giving an adequate analysis of different gram matical problems such as diatheses, tenses and aspects, and lexical analyses by formal representations of meanings of verbal predicates and prepositions. The paper intends to show how Combinatory Logic can solve on the one hand, the formal representations of tenses and aspects in natural languages with the help of the topology of intervals and, on the other hand, the problem of the synthesis of a lexical predicate from a formal description of its meaning by means of a semantic Cognitive Scheme (SCS). We want to explain, in following an example, how can be explained the “natural” inference between two utterances like John took the Mary’s pen. > Now, John has got the pen.

  • FLAIRS Conference - Ontologies, Semantic Maps, and Cognitive Scheme.
    2007
    Co-Authors: Jean-pierre Desclés
    Abstract:

    What are specific relations between Web-semantic and ontology (Uschold, 2005)? What is an ontology of a domain? What are the relations between texts relative to a domain and an ontology of this domain? How to build an ontology from texts (Aussenac-Gilles et al., 2005)? In our approach of these questions, we consider that there are different levels of ontologies: (i) ontology of a domain; (ii) ontology of relations that leads to a “semantic map” for structuring the ontology of a domain; (iii) general ontology, or “upper ontology”, that gives formal semantic representations of concepts, definitions by combining semantic primitives and inference rules. The aim of this paper is to introduce, for further discussions, clear and formal distinctions between three levels of “ontology”: the ontology specific to a domain with first-level-concepts and classes of instances; secondlevel-concepts of a semantic map relative to a “notion” (as cause, action, localization of events in space or in time, meeting between different peoples ...); third-level-concepts of a general ontology where are interpreted the second and first levels concepts by means of Schemes (l-expressions with types) and different (functional) types of objects. We plane also to explain how these levels are articulated between them. We start with the notion of Frege’s concept, viewed as an application operation (in an applicative language) of an operator (a mathematical function) from a domain of operands into {true, false}, concepts being opposite to objects or absolute operands. We introduce the notions of “typical” and “atypical” instances of a firth-level-concept by the way developed in the framework of the Logics of Determination of Objects (LDO) in considering “intension “ and “extension” of a concept (Descles, 2002; Pascu, 2006). We introduce a “typical object” associated to each concept, this typical object is interpreted as an abstract representation (and mental) of the concept, viewed as object. We introduce also determinative operations acting on objects and generating instances from the typical object. This logical framework gives a better flexibility for building an ontology of a domain where many typical objects inherit all properties of a concept but there are also atypical objects that cannot inherit all properties of a concept. A semantic map, defined for a specific notion – “cause”, “action” and so on ..., is a structured set of second-level-concepts where to each concept ‘f’ of the semantic map is associated a class of linguistic markers or

Albert B. Hood - One of the best experts on this subject based on the ideXlab platform.

  • Cognitive Development of Students in China and the USA: Opposite Directions?:
    Psychological Reports, 1998
    Co-Authors: Li-fang Zhang, Albert B. Hood
    Abstract:

    “Universality” has been claimed as one of the major characteristics for theories of Cognitive development. Based in part on the work of Piaget and Kohl-berg, Perry developed a Cognitive Scheme of p...

  • Cognitive Development of Students in China and the USA: Opposite Directions?
    Psychological Reports, 1998
    Co-Authors: Li-fang Zhang, Albert B. Hood
    Abstract:

    “Universality” has been claimed as one of the major characteristics for theories of Cognitive development. Based in part on the work of Piaget and Kohl-berg, Perry developed a Cognitive Scheme of phases of intellectual development along which students in the USA move during their college years. An inventory designed to assess the Perry's stages of Cognitive development of Chinese students was constructed, modeled after several American inventories. Based on responses by 808 Chinese students, Cognitive development seemed to proceed in the direction opposite from that of the U.S. students at least during the first three undergraduate years. Explanations include the current environment in Chinese education.

Waleed Youssef - One of the best experts on this subject based on the ideXlab platform.

  • A Cognitive Scheme for gateway protection in wireless sensor network
    Applied Intelligence, 2008
    Co-Authors: Waleed Youssef, Mohamed Younis
    Abstract:

    In wireless sensor networks, sensor readings are gathered at a gateway for processing and forwarding to a remote command center. The potential closeness of the gateway to dangerous events, e.g. fires, exposes it to damage and thus risks making the network dysfunctional. Therefore, protecting the gateway by repositioning it away from safety-hazardous spots is critical for the operation of the network. However, moving the gateway too far from the sensors that report on active events would have negative effect on the network performance, e.g. throughput and energy consumption. Therefore, balancing the gateway safety and network performance goals will be necessary. In this paper, we present GRISP, a novel Gateway Relocation algorithm for Improved Safety and Performance. GRISP employs an evolutionary neural network model to assess the safety of the gateway at the various locations. The model is then used to direct the search in an area of interest for a safer position that would enhance or at least maintain an acceptable level of network performance. In addition, GRISP guides the gateway during the move by finding safe paths leading to the new location. Our experimental validation results demonstrate the effectiveness of GRISP.

Chen Qi-mei - One of the best experts on this subject based on the ideXlab platform.

  • Cooperative Diversity Spectrum Cognitive Scheme Based on Game Theory
    2009 WRI International Conference on Communications and Mobile Computing, 2009
    Co-Authors: Ye Zhihui, Shen Keqin, Chen Qi-mei
    Abstract:

    Wireless spectrum environment Cognitive is significant for improving spectrum efficiency, and cooperative diversity can enhance capacity of system and quality of service. A kind of cooperative diversity spectrum Cognitive Scheme based on game theory is proposed, which utilizing cooperate Cognitive for data merging, along with exciting mechanism to spur selfish nodes in networks to be willing to provide cooperation. Simulations show that the performance of the Cognitive radio networks is optimized.