**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**383

# Search results for: dilatation curve

##### 383 The Control Vector Scheme for Design of Planar Primitive PH curves

**Authors:**
Ching-Shoei Chiang,
Sheng-Hsin Tsai,
James Chen

**Abstract:**

**Keywords:**
PH curve,
hodograph,
Bézier curve.

##### 382 Comparison of the Distillation Curve Obtained Experimentally with the Curve Extrapolated by a Commercial Simulator

**Authors:**
Lívia B. Meirelles,
Erika C. A. N. Chrisman,
Flávia B. de Andrade,
Lilian C. M. de Oliveira

**Abstract:**

**Keywords:**
Distillation curve,
petroleum distillation,
simulation,
true boiling point curve.

##### 381 Thermo-Mechanical Processing of Armor Steel Plates

**Authors:**
Taher El-Bitar,
Maha El-Meligy,
Eman El-Shenawy,
Almosilhy Almosilhy,
Nader Dawood

**Abstract:**

The steel contains 0.3% C and 0.004% B, beside Mn, Cr, Mo, and Ni. The alloy was processed by using 20-ton capacity electric arc furnace (EAF), and then refined by ladle furnace (LF). Liquid steel was cast as rectangular ingots. Dilatation test showed the critical transformation temperatures Ac_{1}, Ac_{3}, M_{s} and M_{f} as 716, 835, 356, and 218 °C. The ingots were austenitized and soaked and then rough rolled to thin slabs with 80 mm thickness. The thin slabs were then reheated and soaked for finish rolling to 6.0 mm thickness plates. During the rough rolling, the roll force increases as a result of rolling at temperatures less than recrystallization temperature. However, during finish rolling, the steel reflects initially continuous static recrystallization after which it shows strain hardening due to fall of temperature. It was concluded that, the steel plates were successfully heat treated by quenching-tempering at 250 ºC for 20 min.

**Keywords:**
Armor steel,
austenitizing,
critical transformation temperatures,
dilatation curve,
martensite,
quenching,
rough and finish rolling processes,
soaking,
tempering,
thermo-mechanical processing.

##### 380 Approximating Maximum Speed on Road from Curvature Information of Bezier Curve

**Authors:**
M. Y. Misro,
A. Ramli,
J. M. Ali

**Abstract:**

**Keywords:**
Speed estimation,
path constraints,
reference
trajectory,
Bezier curve.

##### 379 Parametric Transition as a Spiral Curve and Its Application in Spur Gear Tooth with FEA

**Authors:**
S. H. Yahaya,
J. M. Ali,
T.A. Abdullah

**Abstract:**

**Keywords:**
Bézier-like cubic function,
Curvature continuity,
Cshapedtransition curve,
Spur gear tooth.

##### 378 Determination the Curve Number Catchment by Using GIS and Remote Sensing

**Authors:**
Abouzar Nasiri,
Hamid Alipur

**Abstract:**

In recent years, geographic information systems (GIS) and remote sensing using has increased to estimate runoff catchment. In this research, runoff curve number maps for captive catchment of Tehran by helping GIS and also remote sensing which based on factors such as vegetation, lands using, group of soil hydrology and hydrological conditions were obtained. Runoff curve numbers map was obtained by combining these maps in ARC GIS and SCS table. To evaluate the accuracy of the results, the maximum flow rate of flood which was obtained from curve numbers, was compared with the measured maximum flood rate at the watershed outlet and correctness of curve numbers were approved.

**Keywords:**
Curve number,
GIS,
Remote sensing,
Runoff.

##### 377 Accurate Dimensional Measurement of 3D Round Holes Based on Stereo Vision

**Authors:**
Zhiguo Ren,
Lilong Cai

**Abstract:**

This paper present an effective method to accurately reconstruct and measure the 3D curve edges of small industrial parts based on stereo vision. To effectively fit the curve of the measured parts using a series of line segments in the images, a strategy from coarse to fine is employed based on multi-scale curve fitting. After reconstructing the 3D curve of a hole through a curved surface, its axis is adjusted so that it is parallel to the Z axis with least squares error and the dimensions of the hole can be calculated on the XY plane easily. Experimental results show that the presented method can accurately measure the dimensions of round holes through a curved surface.

**Keywords:**
Stereo Vision,
3D Round Hole Measurement,
Curve Fitting,
3D Curve Reconstruction,
Least Squares Error.

##### 376 Solving 94-bit ECDLP with 70 Computers in Parallel

**Authors:**
Shunsuke Miyoshi,
Yasuyuki Nogami,
Takuya Kusaka,
Nariyoshi Yamai

**Abstract:**

**Keywords:**
Pollard’s rho method,
BN curve,
Montgomery
multiplication.

##### 375 Generating Arabic Fonts Using Rational Cubic Ball Functions

**Authors:**
Fakharuddin Ibrahim,
Jamaludin Md. Ali,
Ahmad Ramli

**Abstract:**

^{1}continuity. The conditions considered are known as the G

^{1}Hermite condition. A simple application of the proposed method is to generate an Arabic font satisfying the required continuity.

**Keywords:**
Continuity,
data interpolation,
Hermite condition,
rational Ball curve.

##### 374 Proposed Developments of Elliptic Curve Digital Signature Algorithm

**Authors:**
Sattar B. Sadkhan,
Najlae Falah Hameed

**Abstract:**

**Keywords:**
Elliptic Curve Digital Signature Algorithm,
DSA.

##### 373 Detection of Keypoint in Press-Fit Curve Based on Convolutional Neural Network

**Authors:**
Shoujia Fang,
Guoqing Ding,
Xin Chen

**Abstract:**

**Keywords:**
Keypoint detection,
curve feature,
convolutional neural
network,
press-fit assembly.

##### 372 Choosing between the Regression Correlation, the Rank Correlation, and the Correlation Curve

**Authors:**
Roger L Goodwin

**Abstract:**

**Keywords:**
Bayesian estimation,
regression model,
rank
statistics,
correlation,
correlation curve.

##### 371 Cost and Productivity Experiences of Pakistan with Aggregate Learning Curve

**Authors:**
Jamshaid ur Rehman,
Shahida Wizarat

**Abstract:**

**Keywords:**
Cost,
Inflection Point,
Learning Curve,
Minima,
Maxima,
and Productivity

##### 370 Preparing the Curve Number (CN) and Surface Runoff Coefficient (C) Map of the Basin in the Aghche Watershed, Iran

**Authors:**
Ali Gholami,
Ebrahim Panahpour,
Amir Hossein Davami

**Abstract:**

**Keywords:**
Aghche Watershed,
Curve Numbers (CV),
Land UseChanges,
Surface Runoff Coefficient(C) Map,
W indicator

##### 369 On the Determination of a Time-like Dual Curve in Dual Lorentzian Space

**Authors:**
Emin Özyılmaz

**Abstract:**

**Keywords:**
Classical Differential Geometry,
Dual Numbers,
DualFrenet Equations,
Time-like Dual Curve,
Position Vector,
DualLorentzian Space.

##### 368 ROC Analysis of PVC Detection Algorithm using ECG and Vector-ECG Charateristics

**Authors:**
J. S. Nah,
A. Y. Jeon,
J. H. Ro,
G. R. Jeon

**Abstract:**

**Keywords:**
Vectorcardiogram (VCG),
Premature Ventricular
contraction (PVC),
ROC (receiver operating characteristic) curve,
ECG

##### 367 The Study of Relative Efficiency in Growth Curve Model

**Authors:**
Nan Chen,
Baoguang Tian

**Abstract:**

In this paper, some relative efficiency have been discussed, including the LSE estimate with respect to BLUE in curve model. Four new kinds of relative efficiency have defined, and their upper bounds have been discussed.

**Keywords:**
Relative efficiency,
LSE estimate,
BLUE estimate,
Upper bound,
Curve model.

##### 366 A Bathtub Curve from Nonparametric Model

**Authors:**
Eduardo C. Guardia,
Jose W. M. Lima,
Afonso H. M. Santos

**Abstract:**

This paper presents a nonparametric method to obtain the hazard rate “Bathtub curve” for power system components. The model is a mixture of the three known phases of a component life, the decreasing failure rate (DFR), the constant failure rate (CFR) and the increasing failure rate (IFR) represented by three parametric Weibull models. The parameters are obtained from a simultaneous fitting process of the model to the Kernel nonparametric hazard rate curve. From the Weibull parameters and failure rate curves the useful lifetime and the characteristic lifetime were defined. To demonstrate the model the historic time-to-failure of distribution transformers were used as an example. The resulted “Bathtub curve” shows the failure rate for the equipment lifetime which can be applied in economic and replacement decision models.

**Keywords:**
Bathtub curve,
failure analysis,
lifetime estimation,
parameter estimation,
Weibull distribution.

##### 365 A Simple Method for Tracing PV Curve of a Radial Transmission Line

**Authors:**
Asfar Ali Khan

**Abstract:**

**Keywords:**
Power Transfer,
PV Curve,
Voltage Stability.

##### 364 Application of Generalized NAUT B-Spline Curveon Circular Domain to Generate Circle Involute

**Authors:**
Ashok Ganguly,
Pranjali Arondekar

**Abstract:**

In the present paper, we use generalized B-Spline curve in trigonometric form on circular domain, to capture the transcendental nature of circle involute curve and uncertainty characteristic of design. The required involute curve get generated within the given tolerance limit and is useful in gear design.

**Keywords:**
Bézier,
Circle Involute,
NAUT B-Spline,
Spur Gear.

##### 363 Position Vector of a Partially Null Curve Derived from a Vector Differential Equation

**Authors:**
Süha Yılmaz,
Emin Özyılmaz,
Melih Turgut,
Şuur Nizamoğlu

**Abstract:**

In this paper, position vector of a partially null unit speed curve with respect to standard frame of Minkowski space-time is studied. First, it is proven that position vector of every partially null unit speed curve satisfies a vector differential equation of fourth order. In terms of solution of the differential equation, position vector of a partially null unit speed curve is expressed.

**Keywords:**
Frenet Equations,
Partially Null Curves,
Minkowski Space-time,
Vector Differential Equation.

##### 362 An Approach to Polynomial Curve Comparison in Geometric Object Database

**Authors:**
Chanon Aphirukmatakun,
Natasha Dejdumrong

**Abstract:**

**Keywords:**
Bezier curve,
Said-Ball curve,
Wang-Ball curve,
DP curve,
CAGD,
comparison,
geometric object database.

##### 361 Dynamic Voltage Stability Estimation using Particle Filter

**Authors:**
Osea Zebua,
Norikazu Ikoma,
Hiroshi Maeda

**Abstract:**

**Keywords:**
normalized PV curve,
optimal filtering method particle filter,
voltage stability.

##### 360 An Attack on the Lucas Based El-Gamal Cryptosystem in the Elliptic Curve Group Over Finite Field Using Greater Common Divisor

**Authors:**
Lee Feng Koo,
Tze Jin Wong,
Pang Hung Yiu,
Nik Mohd Asri Nik Long

**Abstract:**

Greater common divisor (GCD) attack is an attack that relies on the polynomial structure of the cryptosystem. This attack required two plaintexts differ from a fixed number and encrypted under same modulus. This paper reports a security reaction of Lucas Based El-Gamal Cryptosystem in the Elliptic Curve group over finite field under GCD attack. Lucas Based El-Gamal Cryptosystem in the Elliptic Curve group over finite field was exposed mathematically to the GCD attack using GCD and Dickson polynomial. The result shows that the cryptanalyst is able to get the plaintext without decryption by using GCD attack. Thus, the study concluded that it is highly perilous when two plaintexts have a slight difference from a fixed number in the same Elliptic curve group over finite field.

**Keywords:**
Decryption,
encryption,
elliptic curve,
greater common divisor.

##### 359 Developing of Fragility Curve for Two-Span Simply Supported Concrete Bridge in Near-Fault Area

**Authors:**
S. Shirazian,
M.R. Ghayamghamian,
G.R. Nouri

**Abstract:**

**Keywords:**
Fragility curve,
Seismic behavior,
Time historyanalysis,
Transportation Network.

##### 358 Implementation and Analysis of Elliptic Curve Cryptosystems over Polynomial basis and ONB

**Authors:**
Yong-Je Choi,
Moo-Seop Kim,
Hang-Rok Lee,
Ho-Won Kim

**Abstract:**

**Keywords:**
Elliptic Curve Cryptosystem,
Crypto Algorithm,
Polynomial Basis,
Optimal Normal Basis,
Security.

##### 357 A Hybrid Particle Swarm Optimization-Nelder- Mead Algorithm (PSO-NM) for Nelson-Siegel- Svensson Calibration

**Authors:**
Sofia Ayouche,
Rachid Ellaia,
Rajae Aboulaich

**Abstract:**

**Keywords:**
Optimization,
zero-coupon curve,
Nelson-Siegel-
Svensson,
Particle Swarm Optimization,
Nelder-Mead Algorithm.

##### 356 Efficient Hardware Implementation of an Elliptic Curve Cryptographic Processor Over GF (2 163)

**Authors:**
Massoud Masoumi,
Hosseyn Mahdizadeh

**Abstract:**

A new and highly efficient architecture for elliptic curve scalar point multiplication which is optimized for a binary field recommended by NIST and is well-suited for elliptic curve cryptographic (ECC) applications is presented. To achieve the maximum architectural and timing improvements we have reorganized and reordered the critical path of the Lopez-Dahab scalar point multiplication architecture such that logic structures are implemented in parallel and operations in the critical path are diverted to noncritical paths. With G=41, the proposed design is capable of performing a field multiplication over the extension field with degree 163 in 11.92 s with the maximum achievable frequency of 251 MHz on Xilinx Virtex-4 (XC4VLX200) while 22% of the chip area is occupied, where G is the digit size of the underlying digit-serial finite field multiplier.

**Keywords:**
Elliptic curve cryptography,
FPGA implementation,
scalar point multiplication.

##### 355 Novel Method for Elliptic Curve Multi-Scalar Multiplication

**Authors:**
Raveen R. Goundar,
Ken-ichi Shiota,
Masahiko Toyonaga

**Abstract:**

**Keywords:**
elliptic curve cryptosystems,
multi-scalar multiplication,
addition chains,
Fibonacci sequence.

##### 354 On-line Lao Handwritten Recognition with Proportional Invariant Feature

**Authors:**
Khampheth Bounnady,
Boontee Kruatrachue,
Somkiat Wangsiripitak

**Abstract:**

This paper proposed high level feature for online Lao handwritten recognition. This feature must be high level enough so that the feature is not change when characters are written by different persons at different speed and different proportion (shorter or longer stroke, head, tail, loop, curve). In this high level feature, a character is divided in to sequence of curve segments where a segment start where curve reverse rotation (counter clockwise and clockwise). In each segment, following features are gathered cumulative change in direction of curve (- for clockwise), cumulative curve length, cumulative length of left to right, right to left, top to bottom and bottom to top ( cumulative change in X and Y axis of segment). This feature is simple yet robust for high accuracy recognition. The feature can be gather from parsing the original time sampling sequence X, Y point of the pen location without re-sampling. We also experiment on other segmentation point such as the maximum curvature point which was widely used by other researcher. Experiments results show that the recognition rates are at 94.62% in comparing to using maximum curvature point 75.07%. This is due to a lot of variations of turning points in handwritten.

**Keywords:**
Handwritten feature,
chain code,
Lao handwritten recognition.