Lester I. McCann

Learn More
Zebra fish and pearl danios were either cross-reared or raised with conspecifics and tested as adults for species preference over 4 days. Subjects were then placed with conspecifics by group for 30 days and retested over 2 days. Initial testing showed less preference (species identification) for conspecifics by cross-reared subjects and less conspecific(More)
The relative contributions of social and stimulus factors in development of rat dietary preferences were examined. Investigation of odor-alone effects revealed that weak odors resulted in preference for familiar-odor diets, but only at longer exposure times. Shorter exposure to strong odors also produced differences in diet preference. When odor and(More)
Division is the most intellectually challenging of the basic operators of relational algebra. Although its utility is unquestioned, its presentation by many textbooks, and therefore by many instructors, leaves much to be desired. This paper examines the standard approaches used to express division in relational algebra and SQL, explains the derivation of(More)
This paper presents an object–oriented approach to the problem of finding optimal binary search trees. We show that object–oriented techniques produce a solution that is an improvement over those created procedurally and that is well within the reach of our undergraduate students. Combining the study of optimality with that of object–oriented design helps(More)
Numerous studies tout the effectiveness of guided lecture notes in improving the quality of student in-class notes, and subsequently improving student performance on quizzes and exams. We have extended this idea, producing electronic 'guided slides' for use in a first semester discrete mathematics course taught for undergraduate computer science students.(More)
The efficiency of Internet search engines has made it trivial for students to find implementations of standard algorithms. This fact has led computer science educators to be more creative with their assignments to encourage students to create their own implementations. Unfortunately, excessive creativity can obscure learning objectives, particularly for(More)
  • 1