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Shaun Viguerie Honors Project

Shaun Viguerie H'12 has completed an Honors project entitled "ISTAT: Online Interface for Hypothesis Testing." An Honors project is a year-long endeavor that culminates with a long Honors thesis and an oral examination by a committee of three examiners. Here is a description of his project: "This honors project involved the creation of an online statistical software application (called ISTAT) for hypothesis testing. The package has a user-friendly interface, and is able to work with data from a variety of different sources. Designed for student use, it supports hypothesis tests commonly covered in introductory statistics courses. The core functionality of the application lies in JavaScript libraries, making it easily extendable. By utilizing many modern web technologies, the project demonstrates the improving capabilities of the web as a platform for complex applications." Shaun's advisor for this project was Professor David Eck.

Posted 13 April 2012

A Mathematical Model of T Cell Exhaustion Caused by HBV/HDV

On Wednesday, November 9th at 4:30pm, Hobart Mathematics Major Yaoxin Liu '12 will discuss his summer research project in Napier 201. In patients with chronic hepatitis B infection, the immune system becomes exhausted, losing its effectiveness over time. Co-infection with another virus, Hepatitis Delta, reduces the amount of HBV in the blood, and so may relieve the exhaustion. During the Summer Research Program last summer, Yixiao Sha, Yaoxin Liu and Prof. Jonathan Forde developed an ordinary differential equation model of the interactions of these two viruses and the immune system to study the effect of a second infection on immune exhaustion. Sha, Liu and Forde started by studying the four dimensional model with only HBV infection, and then added the second virus, HDV. They also analyzed various steady states and their stability for both systems. All the stability conditions are found for the four dimensional system with only HBV infection. For the five dimensional system with HDV, numerical simulations show the existence of positive steady states representing chronic coinfection. The model suggests that co-infection does not reduce the exhaustion level, but increases damage due to general inflammation. (Refreshments will be served beforehand.)

Posted 4 November 2011

Graph Theory Article Published

An article by Professor Erika King and her students, Trevor Gionet and Yixiao Sha, has been published in the journal Discrete applied Mathematics. The article, which is titled "A revision and extension of results on 4-regular, 4-connected, claw-free graphs," corrects a classification of 4-connected, claw-free, well-covered graphs that was published in 1995.

Posted 2 June 2011

Department Prizes 2011

Every Spring, the Department of Mathematics and Computer Science awards several prizes to students in recognition of excellence in mathematics or computer science. These prizes have been endowed at various times in the history of the department, and they carry (small) cash awards in addition to the recognition.

Prizes awarded in Spring 2011 were as follows:

  • The Robert L. Beinert Prize, awarded to a graduating Senior to recognize excellence in Mathematics, to Zhiyou Cao '11.
  • The John S. Klein Prize, awarded to a graduating Senior to recognize excellence in Computer Science, to Reynaldo Kelly '11.
  • The Glen M. Lee Prize, awarded for the first time in 2011, to the Hobart Senior who has displayed the greatest proficiency in Mathematics and Athletics, to Kyle Whitaker '11.
  • The William Ross Proctor Prize, awarded to the William Smith sophomore who have achieved the highest rank in mathematics in their first two years at the Colleges, to Yanfen Wu '13
  • The Irving Bentsen Prize, awarded to the second year student at Hobart College who has the most outstanding record in mathematics and computer science, to Samuel Heinle '13 and Alexander Kittelberger '13.

Posted 30 April 2011

Students Elected to Phi Beta Kappa

ΦBK (Phi Beta Kappa) is a national academic honor society, founded in 1776, and currently having chapters at 280 American colleges and universities. According to its web site, "Phi Beta Kappa celebrates and advocates excellence in the liberal arts and sciences. Its campus chapters invite for induction the most outstanding arts and sciences students at America's leading colleges and universities."

In 2011, the following mathematics students were selected by Zeta of New York, the HWS chapter of ΦΒΚ, for membership:

  • Yaoxin Liu (H'12)
  • Jessica Tarantino (WS'12)
  • Sarah Tarantino (WS'12)

It is noteworthy that all three students were elected to membership as Juniors, which is considered a singular honor.

Posted 30 April 2011

Sigma Xi Nominees

Sigma Xi (www.sigmaxi.org) is an international scientific research society, founded in 1886 to "honor excellence in scientific investigation and encourage a sense of companionship and cooperation among researchers in all fields of science and engineering."

Each year, students who have done research in mathematics or computer science and who are in their last year at the Colleges are nominated by the Department of Mathematics and Computer Science for student membership in Sigma Xi.

For 2011, the nominees are:

  • Max Beckett (H'11)
  • Reynaldo Kelly (H'11)
  • Yixiao (Selena) Sha (WS'12)

(Selena, who is in the 3-2 Engineering program, was nominated as a Junior because she will be moving on to Columbia University next Fall to complete the engineering program.)


Posted 30 April 2011

VIREOS at NYC-WIC

Marcela Melara '12 attended the New York Celebration of Women in Computing (NYC-WIC) in Albany, NY on April 8, along with Professor Stina Bridgeman and two other students (Yanfen Wu '13 and Kathryn Middleton). At the conference, Marcela gave a presentation based on a paper that she had co-authored with Professor Marc Corliss: "VIREOS: An Integrated, Bottom-Up, Educational Operating Systems Project with FPGA Support," SIGCSE Technical Symposium on Computer Science Education, March 2011. The paper report on work done by Marcela and Professor Corliss in the Summer of 2010.

Posted 14 April 2011

Using FPGAs to Create a Complete Computer System

On Thursday, April 7th, at 4:15PM, in Napier 101, Marcela Melara (WS '12) will give a talk on computer systems and FPGAs. An FPGA is a programmable soft-processor that can be used to implement complex digital circuits such as a processor for a computer. Marcela will describe some work she has done implementing a basic yet complete computer system on an FPGA for an architecture called Larc. A major task of this project was to add support for essential hardware devices such as a monitor, a keyboard and a small hard drive. Furthermore, she added architectural support for running an operating system called VIREOS, which includes support for a file system and timesharing, among other features. (Refreshments will be served beforehand.)

Posted 5 April 2011

Article Published

Trevor Gionet (Hobart College '12) and Yixiao Sha (William Smith College '12) worked on a summer research project in 2010 with Professor Erika King. The goal of the project was to find a more efficient way of proving a theorem characterizing 4-regular, claw-free, well-dominated graphs, which was originally proved by Prof. King using roughly 350 pages. However, during their first week of research, Yixiao and Trevor discovered a graph that was omitted from a characterization by Michael D. Plummer originally used to prove Prof. King's theorem. Thus their research was redirected to revise Plummer's characterization.

Trevor and Yixiao were able to complete Plummer's characterization, revise a result in a paper that used that characterization, and prove a case of Prof. King's theorem. They wrote an article with Prof. King entitled "A revision and extension of results on 4-regular, 4-connected, claw-free graphs", that includes their results. The paper was recently accepted into the journal Discrete Applied Mathematics.

Posted 15 March 2011

Department Prizes

Each Spring, the Department of Mathematics and Computer Science awards several prizes to recognize students for their academic achievements. The prizes for 2010 went to the following students:
  • The Robert L. Beinert Prize, awarded to a graduating Senior to recognize excellence in Mathematics, to Christine Luongo '10 and Katelyn Tyson '10.
  • The John S. Klein Prize, awarded to a graduating Senior to recognize excellence in Computer Science, to Joshua Davis '10, Robert Hendry '10, and Sara Young.
  • The Abigail Mosey Prize, awarded to a graduating Senior or generosity in helping others to learn and appreciate mathematical ideas, to Lisa Maticic '10.
  • The Catharine Adele Rippey '35 Prize, awarded to a William Smith student to recognize excellence in Mathematics, to Katelyn Tyson '10 and Christine Luongo '10.
  • The William Ross Proctor Prize, awarded to the William Smith students who have achieved the highest rank in mathematics in their first two years at the Colleges, to Jing Luo '12 and Marcela Melara '12.
  • The Irving Bentsen Prize, awarded to the second year student at Hobart College who has the most outstanding record in mathematics and computer science, to Yaoxin Liu '12.

The Department also nominated six seniors for student membership in the Sigma Xi Scientific Research Society: Joshua Davis, Robert Hendry, Alexander Kridler, Christine Luongo, Katelyn Tyson, and Sara Young.

We also note that the following Mathematics and Computer Science majors were inducted into the Phi Beta Kappa honor society in Spring 2010: Daisy Bird, Joshua Davis, Robert Hendry, Christine Luongo, and Sara Young. In addition, two Mathematics minors were inducted into ΦΒΚ as Juniors in Spring 2009: Emma Daley and Desislava Byanova.

For more information about departmental prizes and lists of past recipients, see the departent's prize page.

Posted 1 March 2011