H. Lin ·W. Chen ( ) ·G. Wang State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou, China, 310027 [email protected] Abstract Curve reconstruction that generates a piece of centric curve from a piece of planar stripshaped point cloud is a fundamental problem in reverse engineering. In this paper, we present a new curvereconstruction algorithm based on an interval B-spline curve. The...

We extend the notion of an invalid-curve attack from elliptic curves to genus 2 hyperelliptic curves. We also show that invalid singular (hyper)elliptic curves can be used in mounting invalid-curve attacks on (hyper)elliptic curve cryptosystems, and make quantitative estimates of the practicality of these attacks. We thereby show that proper key validation is necessary even in cryptosystems bas...

The standard derivation of the accelerationist Phillips curve relates expected real wage in ation to the unemployment rate and invokes a constant price markup and adaptive expectations to generate the accelerationist price in ation formula. Blanch ower and Oswald (1994) argue that microeconomic evidence of a low autoregression coe cient in real wage regressions invalidates the macroeconomic Phi...

Intersection points of curves are the basic elements for many algorithms in the CAD/CAM area. In most circumstances, the key property of an intersection point is the behavior of the curves in a neighborhood of that intersection point. This paper presents the classi3cation of intersection pointsfiom the differential geometric point of view in terms of the movement ofparticles along curves. The m...

Space filling curves (SFCs) are widely used in the design of indexes for spatial and temporal data. Clustering is a key metric for an SFC, that measures how well the curve preserves locality in moving from higher dimensions to a single dimension. We present the onion curve, an SFC whose clustering performance is provably close to optimal for cube and nearcube shaped query sets, irrespective of ...

equitable distribution of health system resources has been a serious challenge for long ago among the health policy makers. conducted studies have mostly ever had emphasis on equality rather than equity. in this paper we have attempted to examine both equality and equity in resources distribution.this is an applied and descriptive study in which we plotted lorenz and concentration curves to des...

background: one of the important aspects of equity in health is equality in the distribution of resources in this sector. the present study aimed to assess the distribution of hospital beds in shiraz in 2014.   methods: in this retrospective cross-sectional study, the population density index and fair distribution of beds were analyzed by lorenz curve and gini coefficient, respectively. descrip...

background: carpet weaving is an occupation that requires sufficient and appropriate lighting. the lighting in carpet weaving workshops affects the productivity and the physical and mental health of workers. therefore, the evaluation of the illumination and the identification of work stations requiring lighting modifications will be helpful in promotion of the health and safety of workers in ca...

in this paper, we study spacelike dual biharmonic curves. we characterize spacelike dual biharmonic curves in terms of their curvature and torsion in the lorentzian dual heisenberg group . we give necessary and sufficient conditions for spacelike dual biharmonic curves in the lorentzian dual heisenberg group . therefore, we prove that all spacelike dual biharmonic curves are spacelike dual heli...