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A Cost Analysis of Software Reliability Testing Model
Wee, Nam-Sook 漢城大學校 2002 論文集 Vol.26 No.1
With the advancements in software engineering techniques, software testing cost has become the dominant factor for the high cost of large-scale software. We develop a software reliability testing model and analyze the minimal total expected cost so that the management can plan ahead testing activity from a cost-benefit perspective. Our model account for the average cost per each testing activity and the damage cost per failure with the future cost discounted. Our model assumes that the total number of errors in the software has a Poisson distribution with known mean λ and failure rate is i.i.d with known distribution G. We investigate the important structural properties of the cost function in this framework.
A New Metric for A Class of 2-D Parametric Curves
Wee, Nam-Sook,Park, Joon-Young Society for Computational Design and Engineering 1998 한국CDE학회 논문집 Vol.3 No.2
We propose the area between a pair of non-self-intersecting 2-D parametric curves with same endpoints as an alternative distance metric between the curves. This metric is used when d curve is approximated with another in a simpler form to evaluate how good the approximation is. The traditional set-theoretic Hausdorff distance can he defined for any pair of curves but requires expensive calculations. Our proposed metric is not only intuitively appealing but also very easy to numerically compute. We present the numerical schemes and test it on some examples to show that our proposed metric converges in a few steps within a high accuracy.
A FAST METHOD FOR GENERATING OFFSET CURVES IN CAD/CAM
WEE, NAM-SOOK 漢城大學校 1998 論文集 Vol.22 No.3
A fast method of computing the offset curves of a planar shape by using the medial axis transform is discussed. The medial axis transform is constructed by decomposing the domain into simpler subdomains, called fundamental domains, and the offset curves have only to be computed for such fundamental domains. This differentiate our method from the conventional ones which use the Voronoi diagram. Our method works well for the shape whose boundary consists of free form curves such as polynomial or rational splines, and it also avoids expensive trimming processes. As a result our method is fast and robust.