Tzu-Yi Chen

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The historical context surrounding the birth of the DARPA High Productivity Computing Systems (HPCS) program is important for understanding why federal government agencies launched this new, longterm high performance computing program and renewed their commitment to leadership computing in support of national security, large science, and space requirements(More)
We examine students' commonsense understanding of computer science concepts before they receive any formal instruction in the field. Specifically, we asked students on the first day of a CS1 class to describe in English how they would arrange a set of numbers in ascending, sorted order. We repeated the experiment with students in an introductory economics(More)
We examine students' commonsense understanding of computer science concepts before they receive any formal instruction in the field. For this study, we asked students on the first day of a CS1 class to describe in English how they would arrange a set of numbers in ascending, sorted order; we then repeated the experiment asking students to sort a list of(More)
Ordering the columns of a nonsymmetric sparse matrix can reduce the fill created in its factorization. Minimum-degree is a popular heuristic for ordering symmetric matrices; a variant that can be used to order nonsymmetric matrices is called column minimum degree. In this paper we describe the design of a multithreaded approximate column minimum degree(More)
We evaluate the effectiveness of neural networks as a tool for predicting whether a particular combination of preconditioner and iterative method will correctly solve a given sparse linear system Ax = b. We consider several scenarios corresponding to different assumptions about the relationship between the systems used to train the neural network and those(More)
This paper reports a multinational , multi-institutional study to investigate Computer Science students' understanding of software design and software design criteria. Student participants were recruited from two groups: students early in their degree studies and students completing their Bachelor degrees. Computer Science educators were also recruited as a(More)
Since logical statements naturally occur in programming and other computing work, educators may hope that all beginning computing students can employ basic logical thinking even if they are not familiar with the formalized mathematical notation. However, Herman and others found that even after being taught logic, students can still fail to correctly apply(More)
This paper reports a multinational , multi-institutional study to investigate Computer Science students' understanding of software design and software design criteria. Students were recruited at two levels: those termed 'first competency' programmers, and those completing their Bachelor degrees. The study, including participants from 21 institutions over(More)
What measurable effect do the language and paradigm used in early programming classes have on novice programmers' ability to do design? This work investigates the question by using data collected from 136 "first competency" students as part of a multi-national, multi-institutional study of students' approach to and attitudes toward design. Analysis of a(More)