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Element Free Galerkin Method applying Penalty Function Method
Choi, Yoo Jin,Kim, Seung Jo 한국산업정보응용수학회 1997 한국산업정보응용수학회 Vol.1 No.1
In this study, various available meshless methods are briefly reviewed and the connection among them is investigated. The objective of meshless methods is to eliminate some difficulties which are originated from reliance on a mesh by constructing the approximation entirely in terms of nodes. Especially, focusing on Element Free Galerkin Method(EFGM) based on moving least square interpolants(MLS1). a new implementation is developed based on a variational principle with penalty function method were used to enforce the essential boundary condition. In addition , the weighted orthogonal basis functions are constructed to overcome disadvantage of MLSI.
Video Traffic Modeling Based On Geo(Y)/G/∞ Input Processes
( Sang Hyuk Kang ),( Ba Ra Kim ) 한국산업응용수학회(구 한국산업정보응용수학회) 2008 한국산업정보응용수학회 Vol.12 No.3
With growing applications of wireless video streaming, an efficient video traffic model featuring modem high-compression techniques is more desirable than ever, because the wireless channel bandwidths are ever limited and time-varying. We propose a modeling and analysis method for video traffic by a class of stochastic processes, which we call `Geo(Y)/G/∞ input processes`. We model video traffic by Geo(Υ)/G/∞ input process with gamma-distributed batch sizes Υ and Weibull-like autocorrelation function. Using four real-encoded, full-length video traces including action movies, a drama, and an animation, we evaluate our modeling performance against existing model, transformed-M/G/∞ input process, which is one of most recently proposed video modeling methods in the literature. Our proposed Geo(Υ)/G/∞ model is observed to consistently provide conservative performance predictions, in terms of packet loss ratio, within acceptable error at various traffic loads of interest in practical multimedia streaming systems, while the existing transformed-M/G/∞ fails. For real-time implementation of our model, we analyze G/D/1/K queueing systems with Geo(Υ)/G/∞ input process to upper estimate the packet loss probabilities.
Fine Segmentation Using Geometric Attraction-Driven Flow And Edge-Regions
( Joo Young Hahn ),( Chang Ock Lee ) 한국산업응용수학회(구 한국산업정보응용수학회) 2007 한국산업정보응용수학회 Vol.11 No.2
A fine segmentation algorithm is proposed for extracting objects in an image, which have both weak boundaries and highly non-convex shapes. The image has simple background colors or simple object colors. Two concepts, geometric attraction-driven flow (GADF) and edge-regions are combined to detect boundaries of objects in a sub-pixel resolution. The main strategy to segment the boundaries is to construct initial curves close to objects by using edge-regions and then to make a curve evolution in GADF. Since the initial curves are close to objects regardless of shapes, highly non-convex shapes are easily detected and dependence on initial curves in boundary-based segmentation algorithms is naturally removed. Weak boundaries are also detected because the orientation of GADF is obtained regardless of the strength of boundaries. For a fine segmentation, we additionally propose a local region competition algorithm to detect perceptible boundaries which are used for the extraction of objects without visual loss of detailed shapes. We have successfully accomplished the fine segmentation of objects from images taken in the studio and aphids from images of soybean leaves.
Approximate Conversion of Rational Bezier Curves
Lee, Byung-Gook,Park, Yunbeom 한국산업정보응용수학회 1998 한국산업정보응용수학회 Vol.2 No.1
It is frequently important to approximate a rational Be′zier curve by an integral, i.e., polynomial one. This need will arise when a rational Be′zier curve is produced in one CAD system and is to be imported into another system, which can only handle polynomial curves. The objective of this paper is to present an algorithm to approximate rational Be′zier curves with polynomial curves of higher degree.