1,721,286 research outputs found
A case-based reasoning with the feature weights derived by analytic hierarchy process for bankruptcy prediction
No full textCase-based reasoning (CBR) is a methodology for problem solving and decision-making in complex and changing business environments. Many CBR algorithms are derivatives of the k-nearest neighbor (k-NN) method, which has a similarity function to generate classification from stored cases. Several studies have shown that k-NN performance is highly sensitive to the definition of its similarity function. Many k-NN methods have been proposed to reduce this sensitivity by using various distance functions with feature weights. This paper proposes an analogical reasoning structure for feature weighting using a new framework called the analytic hierarchy process (AHP)-weighted k-NN algorithm. The paper also introduces AHP methodology for assigning relative importance in case indexing and retrieving. The AHP model is a methodology effective in obtaining domain knowledge from numerous experts and representing knowledge-guided indexing. The proposed AHP weighted k-NN algorithm has been shown to achieve classification accuracy higher than the pure k-NN algorithm. This approach is applied to bankruptcy prediction involves the examination of several criteria, both quantitative (financial ratios) and qualitative (non-financial variables). (C) 2002 Elsevier Science Ltd. All rights reserved
Line-of-sight guidance laws for formation flight
No full textTwo-dimensional formation guidance laws for formation flight using only line-of-sight angle information are addressed. The main idea is to use the line-of-sight angles to two nearby vehicles to maintain the formation position of the current vehicle. Such a formation guidance law is useful because measurement of the line-of-sight angles does. not require data communication between the vehicles. We propose two methods of using the line-of-sight angle information for formation guidance: the angle information is used to control the flight-path angle and the velocity of the formation vehicle. Approach guidance and formation guidance of the two leading vehicles are also proposed. Stability of the proposed formation guidance laws is analyzed by using the Jacobian at the equilibrium point. Multiple-vehicle formation flight is simulated to verify the guidance laws proposed
A robust stereo disparity estimation using adaptive window search and dynamic programming search
No full textDoped fibre length and pump power of gain-flattened EDFAs
No full textA simple method for determining the doped fibre length and the pump power of gain-flattened EDFAs has been proposed on the basis of average inversion of the erbium ions with maximum gain flatness. The difference between the obtained and the desired gains to achieve the output power per channel of -5 -5dBm while maintaining the maximum gain flatness was <+/-0.3dB
Investigation into hydromechanical reverse redrawing assisted by separate radial pressure - process development and theoretical verification
No full textHigh-quality cups with a deep drawing ratio of more than four cannot be simply drawn by conventional drawing and redrawing. A special technology is required to form cups of a high deep drawing ratio. In the present study, after the conventional mechanical deep drawing process, subsequent hydromechanical reverse redrawing with controlled radial pressure has been developed. In order to increase the deep drawing ratio by mon than four, the radial pressure is controlled independently of the chamber pressure and thus an optimum forming condition can be determined by varying the radial pressure. The process has been verified by a rigid-plastic finite element (FE) analysis considering all the external force boundary conditions induced by the hydrostatic pressure. The pressure distribution on the sheet is calculated numerically from the simplified Navier-Stokes equation. Through the experiment and the FE analysis, it has been shown that hydromechanical reverse redrawing assisted by separate radial pressure, developed in the present study, helps to increase the drawability of cylindrical cups, and thus it is useful when forming long cups
Substituted Aluminum Metal Gate on high-K Dielectric for low work-function and Fermi-Level Pinning Free
No full textDopant-free FUSI PtxSi metal gate for high work function and reduced Fermi-level pinning
No full text10.1109/LED.2005.857711IEEE Electron Device Letters2611796-798EDLE
Usability-based caching of query results in OLAP systems
No full textIn this paper we propose a new cache management scheme for online analytical processing (OLAP) systems based on the usability of query results in rewriting and processing other queries. For effective admission and replacement of OLAP query results, we consider the benefit of query results not only for recently issued queries but for the expected future queries of a current query. We exploit semantic relationships between successive queries in an OLAP session, which are derived from the interactive and navigational nature of OLAP query workloads, in order to classify and predict subsequent future queries. We present a method for estimating the usability of query results for the representative future queries using a probability model for them. Experimental evaluation shows that our caching scheme using the past and future usability of query results can reduce the cost of processing OLAP query workloads effectively only with a small cache size and outperforms the previous caching strategies for OLAP systems. (C) 2002 Elsevier Inc. All rights reserved
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