Browsing by Author "CHEN, CS"

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A NEW FAST ONE-PASS THINNING ALGORITHM AND ITS PARALLEL HARDWARE IMPLEMENTATION
(1990-07-01)
CHEN, CS
;
TSAI, WH
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資訊科學與工程研究所
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Institute of Computer Science and Engineering
Distributed admission control for supporting isochronous traffic in DQDB MANs
(1995)
YUANG, MC
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CHEN, CS
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資訊工程學系
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Department of Computer Science
ESTIMATING PIT-EXCAVATION VOLUME USING CUBIC SPLINE VOLUME FORMULA
(1991-05-01)
CHEN, CS
;
LIN, HC
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土木工程學系
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Department of Civil Engineering
Current methods used for estimating the volume of pit escavation assumes that the ground profile between the grid points is linear (based on the trapezoidal rule), or nonlinear (based on Simpson's 1/3 and 3/8 formulas). Generally speaking, the nonlinear profile formulas provide better accuracy than the linear profile formulas. However, all the methods mentioned have a common drawback: The joints (grid points) of any two straight lines (the trapezoidal rule), quadratic polynomials (Simpson's 1/3 formula), or cubic polynomials (Simpson's 3/8 formula) form sharp corners. Consequently, these models may not describe the ground profile well. In this paper, formulas based on an extension of the cubic spline polynomial are presented. The grid of this new method is constructed by choosing the variational points of the ground profile and then dividing the pit's area into rectangles of unequal size. Therefore, the new formulas can be used for estimating the excavation volume of a pit divided into a grid with unequal intervals. Further, due to the characteristics of the cubic spline polynomial, a curve modeled by this polynomial can match the ground profile well. The new formulas should provide better accuracy than the other methods mentioned.
SOLVING CIRCULAR CURVE USING NEWTON-RAPHSON METHOD
(1992-02-01)
CHEN, CS
;
HWANG, LS
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交大名義發表
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土木工程學系
;
National Chiao Tung University
In highway, railway, canal, and pipeline locations, the horizontal curves employed at points of change in direction are arcs of circles. A circular curve can be described by seven principal elements: (1) Radius of the curve; (2) deflection angle between tangents; (3) tangent distance; (4) external distance; (5) middle ordinate; (6) long chord; and (7) length of curve. In conventional surveying, the radius of the curve is given, and the deflection angle between the tangents is measured; all other elements can be calculated. However, these two elements sometimes are unknown in the fieldwork. In this case, a new method must be considered. In this paper, a numerical solution called the Newton-Raphson's method is presented. Using this method, the radius of a curve and the deflection angle between the tangents can be calculated so long as two of the other principal elements are given. To be convenient for actual use, a computer program is included.
UNIFIED ARRAY ARCHITECTURE FOR DISCRETE COSINE TRANSFORM, SINE TRANSFORM AND THEIR INVERSES
(1995-10-12)
GUO, JI
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CHEN, CS
;
JEN, CW
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電控工程研究所
;
Institute of Electrical and Control Engineering
A unified array design for the discrete cosine transform, discrete sine transform and their inverses based on a new general formulation is presented. The presented design provides the flexibility to adaptively select different types of transforms in transform coding according to the characteristics of images for minimising the bit rate as much as possible.