Proposals

Below are some proposals for talks from the past (and current). By clicking on the ID number, more details are shown. By default, these are sorted chronologically (recent first) and by then by last name. The data can be sorted by alternate means by using the links at the top right, each allowing ascending or descending orders.

Displaying 301-320 of 471 results.
ID: 256
Year: 2009
Name: Donald Peterson
Institution: Iowa State University
Subject area(s): Encryption, Number Theory
Title of Talk: The 1/P Pseudo-Random Number Generator

Abstract: Seemingly suitable for encryption, the 1/P pseudo-random number generator quickly outputs a long, well-distributed sequence of digits from a small seed. However, without any prior knowledge of the seed, it can be determined and the sequence can be predicted both forwards and backwards by careful examination of 2|P| + 1 digits of the sequence. This article examines how to develop the generator, and more importantly given a small bit of any sequence, how to predict the remaining sequence.
ID: 255
Year: 2009
Name: Joel Haack
Institution: University of Northern Iowa
Subject area(s): history of mathematics, mathematics education
Title of Talk: A Survey of MAA Study Tours and the Iowa Section

Abstract: Highlights of the MAA Study Tours, with special attention to the participation of members of the Iowa Section.
ID: 254
Year: 2009
Name: Mariah Birgen
Institution: Wartburg College
Subject area(s): Teaching, Calculus
Title of Talk: Calculus for the 21st Century

Abstract: There are several deep issues with the way we have been delivering calculus to this generation of students. First is the issue of the audience. With the extreme growth in pre-health science majors, the majority of students in our first semester calculus courses are Biology majors who are taking the course because it is required for the MCAT. They are not particularly excited to be there and are not afraid to share that opinion with the rest of the class. Second, which is tied to the first, is the issue of AP calculus. Many students coming to college who do want to study in the mathematical sciences are not in that first semester calculus course because they have AP credit. Thus, we often do not see OUR students until after that critical first semester in college. Additionally, the AP calculus curriculum is not equivalent to the material we deliver in college, so the students are always lacking, especially in sequences and series. The last issue has to do with engineering. The fundamental reason calculus is the first mathematics course taught to STEM (science, technology, engineering, and mathematics) majors in College is because of the space race. As a nation, we sent a majority of our mathematically talented and gifted students into engineering for decades. However, Wartburg does not have an engineering College and neither do most of our liberal arts college kin. We do have a small number of engineering science majors every year, but they are dwarfed by the health sciences students who are probably not taking calculus based physics until their third or fourth year at Wartburg. <p> Our new applied calculus
ID: 252
Year: 2009
Name: Elgin Johnston
Institution: Iowa State University
Subject area(s): Math education, out reach
Title of Talk: A Teachers Circle for Middle School Math Teachers

Abstract: Last year I partnered with Jean Krusi, an Ames Middle School Mathematics teacher, and Gail Johnston, ISU Mathematics Lecturer, to organize and run a Teachers Circle for Middle School Mathematics Teachers. We followed up with a one week Teachers' Circle workshop in June 2009. This talk will describe our experience and supply good references for those interested in trying something like this in their own areas.
ID: 248
Year: 2008
Name: Carl Cowen
Institution: Indiana University--Purdue University Indianapolis
Subject area(s):
Title of Talk: Rearranging the Alternating Harmonic Series

Abstract: The commutative property of addition is so familiar to all of us as school children that it comes as a shock to those studying college level mathematics that NOT all 'natural extensions' of the law are true! One of the first instances that we see the failure of an extended commutative law of addition is in infinite series. Often in the introduction to infinite series in calculus, one sees Riemann's Theorem: A conditionally convergent series can be rearranged to sum to any number. Unfortunately, the usual proof of this theorem does not indicate what the sum of a given rearrangement is. In this talk, we will examine the best known conditionally convergent series, the alternating harmonic series, and show how to find the sum of any rearrangement in which the positive terms and the negative terms are each in their usual order.
ID: 247
Year: 2008
Name: Carl Cowen
Institution: Indiana University--Purdue University Indianapolis
Subject area(s):
Title of Talk: Connections Between Mathematics and Biology

Abstract: Dr. Rita Colwell, a research microbiologist and former Director of the National Science Foundation, regards the mathematical sciences as the backbone for US Scientific and Engineering research. Many scholars see the next few decades as a time of intensive progress in the biological sciences. Dr. Colwell sees mathematics as being an integral part of the progress in biology, not a traditional view, but a forward looking one. In this talk, Carl Cowen will outline some of the research areas in the emerging collaborations between mathematical and biological scientists. In addition, Cowen, who began his study of the mathematics of neuroscience in 2002-03 at the Mathematical Biosciences Institute at Ohio State University, and who worked in 2003-04 as a junior post-doc in the lab of Prof. Christie Sahley in the Purdue University Biology Department, will illustrate the connection between mathematics and neuroscience with a discussion of the Pulfrich phenomenon, an experiment that helps illuminate how the brain processes visual images. There are few mathematical or biological prerequisites for this discussion.
ID: 246
Year: 2008
Name: Patsy Fagan
Institution: Drake University
Subject area(s):
Title of Talk: Activities to Nspire College Algebra and Calculus

Abstract: This hands-on workshop will present activities for a College Algebra and Calculus class. This is for the novice user of the TI-Nspire CAS handheld. This is a repeat of the earlier session.
ID: 245
Year: 2008
Name: Patsy Fagan
Institution: Drake University
Subject area(s):
Title of Talk: Activities to Nspire College Algebra and Calculus

Abstract: This hands-on workshop will present activities for a College Algebra and Calculus class. This is for the novice user of the TI-Nspire CAS handheld.
ID: 244
Year: 2008
Name: Elgin Johnston
Institution: Iowa State University
Subject area(s):
Title of Talk: Running a Math Circle

Abstract: For the last ten years I have been running a Math Circle for local middle and high school students. I will talk a little about the organization of the circle, how the circle is conducted, and about the mathematics we investigate.
ID: 243
Year: 2008
Name: Monica Meissen
Institution: Clarke College
Subject area(s):
Title of Talk: Using Artificial Intelligence in the Teaching of Algebra and Precalculus

Abstract: Clarke College has been using software developed by Hawkes Learning to teach their Elementary Algebra, Intermediate Algebra and Precalculus courses with great success, especially during the current academic year. In addition to giving a demonstration of the software, Monica will describe how using Hawkes' products has helped with student placement and success in the classroom.
ID: 242
Year: 2008
Name: Palle Jorgensen
Institution: University of Iowa
Subject area(s): Analysis
Title of Talk: Matrix functions

Abstract: When I was little my father, for reasons unbeknownst to me, told me about low-pass and high-pass filters. He was a telephone engineer and worked on filters in signal processing. The 'high' and 'low' part of the story refers to frequency bands. Not that this meant much to me at the time. Rather, I was fascinated by the pictures of filter designs in the EE journals stacked up on the floor. And it was only many years later I came across this stuff in mathematics: quadrature mirror filters and all that; yet the visual impression still lingered. The talk will cover some of this math, especially wavelets: Subband filters define operators in Hilbert space which satisfy all kinds of abstract relations, and they are terribly useful. They are used in math and in signal processing. Matrix functions from math are called poly-phase matrices by engineers, and they are scattering matrices in other circles, and quantum gates in physics. In fact a lot of the things we do in math are known and used in other fields, but under different names, and known in different ways.
ID: 240
Year: 2008
Name: James Freeman
Institution: Cornell College
Subject area(s): Teaching College
Title of Talk: Calculus: The 800 lb Gorilla in the Curriculum---Ideas from Cornell

Abstract: Even though there has been over 30 years of trying to keep the 800 lb gorilla (calculus) from dominating the room (collegiate level mathematics curriculum), the gorilla is still with us. Whether it is arguing about what and how calculus material is taught; what to do with over-prepared (high school calculus) and under-prepared students; and how to keep calculus from dominating the mathematics major in the zero sum game of available courses in most schools in Iowa, we all must deal with the gorilla. In this presentation, we will discuss two different answers to these questions currently being tried at Wartburg and Cornell and hopefully get a lively discussion going on what everyone is doing to control the gorilla. Cornell is following the lead of Grinnell and replaced our 4 sequence calculus offering with a two course sequence which covers several variable calculus in the second course.
ID: 239
Year: 2008
Name: Mariah Birgen
Institution: Wartburg College
Subject area(s): Teaching College
Title of Talk: Calculus: The 800 lb Gorilla in the Curriculum---Ideas from Wartburg

Abstract: Even though there has been over 30 years of trying to keep the 800 lb gorilla (calculus) from dominating the room (collegiate level mathematics curriculum), the gorilla is still with us. Whether it is arguing about what and how calculus material is taught; what to do with over-prepared (high school calculus) and under-prepared students; and how to keep calculus from dominating the mathematics major in the zero sum game of available courses in most schools in Iowa, we all must deal with the gorilla. In this presentation, we will discuss two different answers to these questions currently being tried at Wartburg and Cornell and hopefully get a lively discussion going on what everyone is doing to control the gorilla. Wartburg is teaching a calculus sequence consisting of an applied calculus followed by a foundations of calculus course.
ID: 238
Year: 2008
Name: Le Gui
Institution: University of Iowa
Subject area(s): 94A12
Title of Talk: Digitalization in the signal processing

Abstract: In real life when we store and transmit analog audio or video signals, we first obtain a digital representation of the signal. This process is called Digitalization or Analog-to-Digital (A/D) conversion and consists of two steps: sampling and quantization. In the "sampling" step we restrict time to a discrete sample of the continuous times. In the "quantization" step we discretize the real values of the time-discrete sample of the first step. We will discuss different quantization methods based on binary expansion or Beta-expansion and compare their "accuracy." "Accuracy" means that we can re-construct a good approximation of the original signal from its digitalization. Or "can you hear me now?"
ID: 237
Year: 2008
Name: Fengrong Wei
Institution: University of Iowa
Subject area(s): biomathematics
Title of Talk: variable selection in high dimensional regression

Abstract: My research work studies statistical regression models for data sets with a small sample but huge number of variables. For example, we may wish to study the same 5000 genes in only 200 individuals with the goal of predicting whether they will develop a certain rare cancer. A classical linear regression for the cancer outcome in terms of the 5000 genes does not work with only 200 data points because the associated linear equations are not full rank. We might choose 200 of the genes and do a regression, but there are over 10^363 such choices. My work uses "penalty functions" add to the linear equations which will make the problem solvable. Theoretically, we can show that the result have the "oracle" property which means it will give us the baseline true model with probability going to 1.
ID: 236
Year: 2008
Name: Fengrong Wei
Institution: University of Iowa
Subject area(s):
Title of Talk: variable selection in high dimensional regression

Abstract: My research work studies statistical regression models for data sets with a small sample but huge number of variables. For example, we may wish to study the same 5000 genes in only 200 individuals with the goal of predicting whether they will develop a certain rare cancer. A classical linear regression for the cancer outcome in terms of the 5000 genes does not work with only 200 data points because the associated linear equations are not full rank. We might choose 200 of the genes and do a regression, but there are over 10^363 such choices. My work uses "penalty functions" add to the linear equations which will make the problem solvable. Theoretically, we can show that the result have the "oracle" property which means it will give us the baseline true model with probability going to 1.
ID: 235
Year: 2008
Name: Martha Waggoner
Institution: Simpson College
Subject area(s):
Title of Talk: Geometer's Sketchpad and Undergraduate Research

Abstract: We were able to purchase 12 student copies of Geometer's Sketchpad to be used by our pre-service teachers for their undergraduate research projects through a faculty development grant from the Simpson academic dean's office. In this talk, we will look at the variety of topics in geometry and computer aided design that our students worked on and how Geometer's Sketchpad helped the students in visualization, conjecture and proof.
ID: 234
Year: 2008
Name: Neil Martinsen-Burrell
Institution: Wartburg College
Subject area(s): Applied Math, Geometry
Title of Talk: The Ping and the Pong: Echolocating for fun and profit

Abstract: Table tennis is the world's most popular sport. Little is known about the physical parameters of the game. In an effort to understand the basic flow of the game, we constructed an echolocation system that could find the location and time of the "ping" and the "pong" based on recordings from 4 microphones placed around the room. Such information can be used to approximately calculate the speeds at which the ball travels in a game of table tennis.
ID: 233
Year: 2008
Name: Russell Goodman
Institution: Central College
Subject area(s):
Title of Talk: Leading a Book Discussion in a Liberal Arts Mathematics Class

Abstract: One of the purposes of Central College
ID: 232
Year: 2008
Name: Dan Willis
Institution: Loras College
Subject area(s): Preservice Teachers
Title of Talk: Math for Elementary Teachers

Abstract: The speaker will survey some of the available research on the mathematics content needs of elementary school teachers and future teachers. He will also discuss the impact this research has had on the development of a two-course 8-credit sequence "Math for Elementary Teachers I/II" at Loras College. This new two-course sequence is a program requirement for all Elementary Education majors at Loras College.