Cover Image, Volume 120, Number 1, January 2019

The Story of the 120-Cell, Volume 48, Number 1

O ne of the most beautiful objects in mathematics is the regular polytope in R4 whose boundary consists of 120 dodecahedral cells. This 120-cell is a rarity among rarities because it lives in three very special worlds. Its home is among the regular polytopes in R4, but it also lives in the remarkable sphere S3 and in the quaternions H. And if this is not enough, the 120-cell encodes the symmetr...

IJCIM Volume 7 Number 1: January - April 1999

The Morse code is an international communication language that is simple, speedy, and low cost. The automatic recognition of Morse code is difficult because maintaining a stable typing rate is not easy. In this paper, a suitable adaptive automatic recognition method, the variable degree variable step size Least-Mean-Square algorithm, is provided and its procedure is divided into three modules: ...

First Monday , Volume 15 , Number 1 - 4 January 2010

Spam becomes a problem as soon as an online communication medium becomes popular. Twitter's behavioral and structural properties make it a fertile breeding ground for spammers to proliferate. In this article we examine spam around a one–time Twitter meme — " robotpickuplines ". We show the existence of structural network differences between spam accounts and legitimate users. We conclude by hig...

Cover Vol 16, No 1, February 2019

Variational PDE Models in Image Processing, Volume 50, Number 1

14 NOTICES OF THE AMS VOLUME 50, NUMBER 1 I mage processing, traditionally an engineering field, has attracted the attention of many mathematicians during the past two decades. From the point of view of vision and cognitive science, image processing is a basic tool used to reconstruct the relative order, geometry, topology, patterns, and dynamics of the three-dimensional (3-D) world from two-di...