Thematic Annotation: extracting concepts out of documents

Contrarily to standard approaches to topic annotation, the technique used in this work does not centrally rely on some sort of -- possibly statistical -- keyword extraction. In fact, the proposed annotation algorithm uses a large scale semantic database -- the EDR Electronic Dictionary -- that provides a concept hierarchy based on hyponym and hypernym relations. This concept hierarchy is used to generate a synthetic representation of the document by aggregating the words present in topically homogeneous document segments into a set of concepts best preserving the document's content. This new extraction technique uses an unexplored approach to topic selection. Instead of using semantic similarity measures based on a semantic resource, the later is processed to extract the part of the conceptual hierarchy relevant to the document content. Then this conceptual hierarchy is searched to extract the most relevant set of concepts to represent the topics discussed in the document. Notice that this algorithm is able to extract generic concepts that are not directly present in the document.Comment: Technical report EPFL/LIA. 81 pages, 16 figure

Reinforced concrete frame structure of shopping centre

Předmětem diplomové práce bylo navrhnout vybrané prvky železobetonové montované skeletové konstrukce jednopodlažního nákupního centra. Vybral jsem si nejvíce zatěžovaný rám na zadané konstrukci, kde jsem předpokládal nejvíce namáhané prvky, které jsem následně navrhnul. Veškeré podklady a výpočty jsou doloženy v části B2 statický výpočet mé diplomové práce.The point of my diploma thesis was design elements of reinforced concrete frame structures mounted single – storey mall.I choose the most exposed to the specified longitudinal frame structure, where I assumed the most highly stressed elements, which I subsequently designed. All documents and calculations are illustrated in part B2 of my diploma thesis.

INTRODUCING RESET PATTERNS: AN EXTENSION TO A RAPID DIALOGUE PROTOTYPING METHODOLOGY

This paper exposes the Rapid Dialogue Prototyping Methodology [1, 2, 3], a methodology allowing the easy and automatic derivation of an ad hoc dialogue management system from a specific task description. The goal of the produced manager is to provide the user with a dialogue based interface to easily perform the target task. In addition, reset patterns, an extension of the prototyping methodology allowing a more flexible interaction with the user, are proposed in order to improve the efficiency of the dialogue. Reset patterns are justified and theoretically validated by the definition of an average gain function to optimize. Two approaches to such an optimization are presented, focusing on a different aspect of the gain function. Eventually, experimental results are presented and a conclusion is drawn on the usefulness of the new feature

Explicit Trade-off and Prospective Analysis in Electronic Catalogs

We consider example-critiquing systems that help people search for their most preferred item in a large electronic catalog. We analyze how such systems can help users in the framework of four existing example-critiquing approaches (RABBIT, FindMe, Incremental Critiquing, ATA and AptDecision). In a second part we consider the use of several types of explicit passive analysis to guide the users in their search, specially in either underconstrained or overconstrained situations. We suggest that such a user-centric search system together with the right explicit passive analysis makes the users feel more confident in their decision and reduces session time and cognitive effort. Finally we present the result of a pilot study

Rapid Dialogue Prototyping Methodology

The objective of this document is to present a rapid dialogue prototyping methodology developed at the Artificial Intelligent Laboratory - Ecole Polytechnique Fédérale de Lausanne. Concretely, the rapid dialogue prototyping methodology is decomposed into 5 consecutive main steps: (1) producing the task model; (2) deriving the initial dialogue model; (3) using a Wizard-of-Oz experiment to instantiate the initial dialogue model; (4) using an internal field test to refine the dialogue model; and (5) using an external field test to evaluate the final dialogue model

Explicit Passive Analysis in Electronic Catalogs

We consider example-critiquing systems that help people search for their most preferred item in a large catalog. We compare 6 existing approaches in terms of user or system-centric, implicit or explicit use of preferences, assumptions used and their behavior in underconstrained and overconstrained situations. We consider several types of explicit passive analysis to guide the users in their search, that is, information offered to the user about his current search but without any action taken by the system. We suggest that such a user-centric system together with the right analysis makes the users feel more confident in their decision and reduces session time and cognitive effort. We have implemented a prototype to evaluate the impact of explicit passive analysis in (1) a query-building and (2) a preference-based approach

Tool for robust stochastic parsing using optimal maximum coverage

This report presents a robust syntactic parser that is able to return a "correct" derivation tree even if the grammar cannot generate the input sentence. The following two step solution is prop osed: the finest corresponding most probable optimal maximum coverage is generated first, then the trees from this coverage are glued into one resulting tree. We discuss the implementation of this method with the SLP toolkit and libkp library

Performance Analysis and Optimization of IEEE 802.11 Protocol in Wireless Ad Hoc Networks

作为新一代无线通信网络的核心技术之一，无线自组织网络技术已成为当前信息技术领域的一大研究热点。作为无线自组织网络的关键技术，媒体接入控制（MediumAccessControl，MAC）协议决定着无线信道的使用方式，并负责为节点分配无线通信资源，其性能的优劣直接影响无线信道的利用率和网络的整体性能。其中，IEEE802.11的MAC协议是目前无线自组织网络的测试系统和实际应用中使用最多的MAC协议之一，也是许多无线自组织网络MAC协议的研究基础。因此，系统研究IEEE802.11的性能并加以针对性的改进，具有极为重要的理论意义和广泛的应用价值。 IEEE802.11MAC协议以分布式协调功能...As one of the essential technologies of next generation mobile communication system, wireless Ad Hoc network has become the focus in the field of current information technologies. As the key component of wireless Ad Hoc networks, Media Access Control (MAC) protocols determine the usage mode of wireless channels and allocate radio resource for nodes, which can directly influence the efficiency of w...学位：工学博士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007015387