- Détails du magazine
- Format
- Magazine
- eISSN
- 1314-4081
- ISSN
- 1311-9702
- Première publication
- 13 Mar 2012
- Période de publication
- 4 fois par an
- Langues
- Anglais

#### Chercher

- Accès libre

First Order Perturbation Bounds of the Discrete-Time LMI-Based H∞ Quadratic Stability Problem for Descriptor Systems

Pages: 3 - 12

#### Résumé

In this paper we propose an approach to obtain first order perturbation bounds for the discrete-time Linear Matrix Inequalities (LMI) based H∞ quadratic stability problem for descriptor systems. Applying the considered approach we are able to compute tight first order perturbation bounds for the LMIs’ solutions to the H∞ quadratic stability problem for discrete-time descriptor systems. In the paper we present an approach to compute the estimates of the individual condition numbers of the considered LMIs. To illustrate the performance and applicability of the results obtained we present a numerical example

#### Mots clés

- Discrete-time descriptor systems
- first order perturbation bounds
- H∞ Quadratic Stability Problem
- LMI based design

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Algorithm for Multiple Model Adaptive Control Based on Input-Output Plant Model

Pages: 13 - 33

#### Résumé

An algorithm for multiple model adaptive control of a time-variant plant in the presence of measurement noise is proposed. This algorithm controls the plant using a bank of PID controllers designed on the base of time invariant input/output models. The control signal is formed as weighting sum of the control signals of local PID controllers. The main contribution of the paper is the objective function minimized to determine the weighting coefficients. The proposed algorithm minimizes the sum of the square general error between the model bank output and the plant output. An equation for on-line determination of the weighting coefficients is obtained. They are determined by the current value of the general error covariance matrix. The main advantage of the algorithm is that the derived general error covariance matrix equation is the same as this in the recursive least square algorithm. Thus, most of the well known RLS modifications for the tracking timevariant parameters can be directly implemented. The algorithm performance is tested by simulation. Results with both SISO and MIMO time variant plants are obtained.

#### Mots clés

- Multiple model adaptive control
- input-output model
- PID controllers
- time variant plants

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Analysis of a Vector Space Model, Latent Semantic Indexing and Formal Concept Analysis for Information Retrieval

Pages: 34 - 48

#### Résumé

Latent Semantic Indexing (LSI), a variant of classical Vector Space Model (VSM), is an Information Retrieval (IR) model that attempts to capture the latent semantic relationship between the data items. Mathematical lattices, under the framework of Formal Concept Analysis (FCA), represent conceptual hierarchies in data and retrieve the information. However, both LSI and FCA use the data represented in the form of matrices. The objective of this paper is to systematically analyze VSM, LSI and FCA for the task of IR using standard and real life datasets.

#### Mots clés

- Formal concept analysis
- Information Retrieval
- latent semantic indexing
- vector space model

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Insurance Dynamics – A Data Mining Approach for Customer Retention in Health Care Insurance Industry

Pages: 49 - 60

#### Résumé

Extraction of customer behavioral patterns is a complex task and widely studied for various industrial applications under different heading viz., customer retention management, business intelligence and data mining. In this paper, authors experimented to extract the behavioral patterns for customer retention in Health care insurance. Initially, the customers are classified into three general categories - stable, unstable and oscillatory. To extract the patterns the concept of Novel index tree (a variant of K-d tree) clubbed with K-Nearest Neighbor algorithm is proposed for efficient classification of data, as well as outliers and the concept of insurance dynamics is proposed for analyzing customer behavioral patterns

#### Mots clés

- Insurance dynamics
- K-d tree
- KNN
- Novel Index tree
- Customer retention

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A Fuzzy Approach for Bidding Strategy Selection

Pages: 61 - 69

#### Résumé

The goal of this work is to explore the applicability of fuzzy logic in multiagent systems for choosing the best bidding strategy in electronic auction. To find the multi-criterion ordering, agents use a fuzzy algorithm ARAKRI2 with direct aggregation operators MaxMin and MinAvg. The key difference between this new approach and known from the literature solution FTNA is in the lack of weighted coefficients. Despite the difference both algorithms give results that are similar. Therefore, the proposed approach can successfully solve the task for multi criteria selection of bidding strategy.

#### Mots clés

- Software agents
- bidding strategy selection

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Some Applications of Intuitionistic Fuzzy Sets for the Determination of a Sociometric Index of Acceptance

Pages: 70 - 77

#### Résumé

A simple use of intuitionistic fuzzy sets to determine and process the information describing the level of acceptance of people in a social group (e.g., pupils in a school class) is presented in the paper. An algorithm of processing linguistic assessments is given that leads to aggregated opinions and conclusions in the form of linguistic evaluation.

#### Mots clés

- Sociometry
- index of acceptance
- intuitionistic fuzzy sets
- linguistic evaluations

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Open Access to Resource Management through Web Services

Pages: 78 - 96

#### Résumé

The paper investigates the capabilities for open access to resource management in multimedia networks through Parlay X Web Services. Resource management allows the network operator to provide Quality of Service (QoS) to user sessions and to apply advanced charging. The study is based on the analysis of Policy and Charging Control (PCC) functions defined for evolved packet systems The PCC comprises flow-based charging including charging control and online credit control, gating control, and Quality of Service Control (QoS) control. The required functionality for open access to QoS management and advanced charging is identified. Parlay X Web Services are evaluated for the support of PCC and some enhancements are suggested. Implementation aspects are discussed and Parlay X interfaces are mapped on IMS control protocols. Use Cases of Parlay X Web services for PCC are presented.

#### Mots clés

- Open service access
- IP multimedia subsystem
- Quality of service
- Policy control
- Charging