Moderate-density parity-check codes from projective bundles

New constructions for moderate-density parity-check (MDPC) codes using finite geometry are proposed. We design a parity-check matrix for the main family of binary codes as the concatenation of two matrices: the incidence matrix between points and lines of the Desarguesian projective plane and the incidence matrix between points and ovals of a projective bundle. A projective bundle is a special collection of ovals which pairwise meet in a unique point. We determine the minimum distance and the dimension of these codes, and we show that they have a natural quasi-cyclic structure. We consider alternative constructions based on an incidence matrix of a Desarguesian projective plane and compare their error-correction performance with regards to a modification of Gallager’s bit-flipping decoding algorithm. In this setting, our codes have the best possible error-correction performance after one round of bit-flipping decoding given the parameters of the code’s parity-check matrix

Frank Tolar Retrospective (Exhibition Catalogue)

Born in 1940, Frank Tolar was a talented and accomplished Southeastern artist. He taught at various institutions including the Art Department, North Carolina A&T University, Greensboro; the School of Architecture, The University of Tennessee Knoxville; and The School of Architecture, University of North Carolina, Charlotte

The Grizzly, October 4, 2018

We Ought to Listen : Professors Gather with Students to Watch Kavanaugh-Ford Hearings • Where\u27s the Money?: Students Reflect on Their Unpaid and Paid Summer Internship Experiences • How Students Feel About Tuition Increases (Badly): Paying for School can be Stressful • Where Does Your Tuition Go? • Students Investing Real Money • Opinions: A Look Back at the 2008 Financial Crisis; Real Cost of Applying to Medical Schools; Division I Athletes Should Not be Paid • Hunter Tabbed for Associate ADhttps://digitalcommons.ursinus.edu/grizzlynews/1603/thumbnail.jp

The Grizzly, October 11, 2018

Student Athletes Distressed by Possible NCAA Violations • Clinica de Migrantes Screens on Campus • Externship Deadline is Rapidly Approaching • Ursinus\u27 Website Receives a New Makeover • Sigma Rho Lambda: Past, Present, Future • Finding Truth: 12 Angry Jurors • Opinions: Juuls Shouldn\u27t be Marketed to Teenagers; Family Separations a Lingering Problem • Ursinus Mourns Loss of Coach Racich • Men\u27s Golf Flourishes in its Opening Matcheshttps://digitalcommons.ursinus.edu/grizzlynews/1604/thumbnail.jp

The Grizzly, September 13, 2018

Reim Time? Not Until After 8 P.M. • Welcoming the New Chaplain and Director of Religious and Spiritual Life • Pre-plated Portions Prove Perplexing, Promising? • Ursinus is Crafting a Values Statement • IDC, But They Do: Professors Weigh In On the IDC • Return of the Ursinusaur • Opinion: Betsy DeVos\u27 Proposed Changes Would be Harmful; Elon Musk is Not That Great • Massive First-Year Football Class Adjusts to Life at Ursinus • Field Hockey Aims to Regain Centennial Conference Supremacyhttps://digitalcommons.ursinus.edu/grizzlynews/1936/thumbnail.jp

The Grizzly, October 25, 2018

New Discriminatory Act Policy Draws Criticism • Radium Girls Will Take the Stage this November • Good and Bad News on Campus Safety • Dr. Tristan Ashcroft Receives Teaching Excellence Award • L.A.X. Strives to Meet the Need for Representation of Latin American Culture on Campus • Meet Quinn Gilman-Forlini • Opinion: The Romanoffs : Death Knell for Streamable Prestige TV • Highlights from the Annual Securities and Fire Safety Report • Fresh-faced UC Women\u27s Rugby Team Continues to Show Improvement • He\u27s Good: Senior Kirk Cherneskie Nails Transition from Linebacker to Kickerhttps://digitalcommons.ursinus.edu/grizzlynews/1605/thumbnail.jp

The Grizzly, February 7, 2019

Dean Nolan Recalls her 33 Year Career at Ursinus • Berman Exhibits Spotlight Opioid Crisis, Patriarchy • Senior Alumni Award: Its History and Value • Rhiannon Giddens to be 2019 Commencement Speaker • Inclusive Community Grant Awardees Announced • Externship Profile: Christopher Karmilowicz Explores the World of Finance • Opinions: U.S. Should Keep its Hands Off Venezuela; The Opioid Crisis: Widespread and Institutional • Men\u27s Hoops Upsets #10 Swarthmore; Williams Jr. Earns CC Player of the Week • Konstanzer Joins 1,000 Point Clubhttps://digitalcommons.ursinus.edu/grizzlynews/1611/thumbnail.jp

The Grizzly, November 15, 2018

Mythbuster: Student Writer Takes on Medusa and Marginalization • Voter Registration Status Causes Issues for Student Voters on Election Day • Members of the Ursinus Community Gather to Remember Victims of the Tree of Life Shooting • What do UC Political Clubs Think About the Recent Elections? • Why Myrin is Full of Government Documents • Opinions: Choosing Classes Needs to be Less Confusing; We Need to Better Recognize World War I Veterans • Fall Sports Seniors Complete Final Seasons • McDaid Makes Ursinus Cross Country History • Q&A with Mike Moronesehttps://digitalcommons.ursinus.edu/grizzlynews/1608/thumbnail.jp

The Grizzly, April 25, 2019

Coffee Shop and Brew Pub Aims to Open Second Location Near UC • In Memory of Dorinda Ma, 1993-2018 • New History Professor Makes Her Mark • Ursinus Student\u27s Internship Takes Her to Yellowstone • Sesquicentennial Celebration Continues with Minerva Term • Ursinus\u27 First Pride Festival • Opinions: Restructuring the Tax Process Might Benefit Americans; Notre Dame Tragedy Speaks to the Necessity of Historical Preservation • UC Golf Ready to Make Noise in CC • The History! With an Exclamation Point! Award: Alex Mumme • Baker and Lyons Reflect on UC Careershttps://digitalcommons.ursinus.edu/grizzlynews/1620/thumbnail.jp

The Grizzly, March 7, 2019

Chair of History Department Featured in Forbes • David Perry Shines Spotlight on College Problems • Book Club Brings Students and Faculty Together • Ariana Brown Reads at Ursinus • Student Worker Profile: Wismer Workers • Senior Feature: Paul Cottam • Opinions: America Could use a Universal Basic Income; New Housing Process Could be a New Mess • The That was the Coolest Lax Goal I\u27ve Ever Seen Award: Bobby McClure • Athlete Spotlight: Peter DeSimone • UC Swim Teams Complete Outstanding Seasons; Women Win 6th Straight Championshiphttps://digitalcommons.ursinus.edu/grizzlynews/1615/thumbnail.jp