i-manager's Journal on Mathematics (JMAT)


Volume 2 Issue 3 July - September 2013

Article

Pairing Figure Skating and Mathematics

Diana Cheng* , Tetyana Berezovski**
* Assistant Professor, Towson University, Maryland, USA.
** Associate Professor, St. Joseph's University, Pennsylvania, USA.
Cheng, D., and Berezovski, T. (2013). Pairing Figure Skating and Mathematics. i-manager’s Journal on Mathematics, 2(3), 1-6. https://doi.org/10.26634/jmat.2.3.2456

Abstract

In light of the Winter Olympic Games, a modeling problem is presented in the context of pair’s figure skating. Prospective and in-service high school teachers used related rates to solve the problem that involved differentiating the Pythagorean theorem and a trigonometric equation. Student work is analyzed and discussed.

Article

Some Characterization of Curves of Constant Breadth According to Bishop Frame in E3 Space

Hülya Gün Bozok* , Handan Öztekin**
* Department of Mathematics, Osmaniye Korkut Ata University, Osmaniye, Turkey.
** Department of Mathematics, Firat University, Elazig, Turkey.
Bozok, H.G., and Öztekin, H. (2013). Some Characterization of Curves of Constant Breadth 3 According to Bishop Frame in E3 Space. i-manager’s Journal on Mathematics, 2(3), 7-11. https://doi.org/10.26634/jmat.2.3.2457

Abstract

In this paper, some characterizations of curves of constant breadth according to Bishop frame in E are presented.

Research Paper

Applied Mathematical Statistical Modeling to Determine the Validity and Reliability of Independent Instructional Measures

James Edward Osler II* , Mahmud A. Mansaray**
* North Carolina Central University.
** Research Analyst, Department of Research, Evaluation and Planning, North Carolina Central University.
Osler, J. E., II. and Mansaray, M.A. (2013). Applied Mathematical Statistical Modeling to Determine The Validity And Reliability of Independent Instructional Measures. i-manager’s Journal on Mathematics, 2(3), 12-31. https://doi.org/10.26634/jmat.2.3.2458

Abstract

Most universities and colleges in United States and elsewhere use student ratings of instruction for summative (e.g. faculty promotion, etc.) and formative (e.g. instructional improvement, etc.) evaluation purposes. This research examines the reliability and validity of the rating instrument used to evaluate teaching effectiveness and student learning outcomes. The sample consisted of 7,919 students of Historic Black College and University [HBCU] who completed the 2012 spring semester. Student Ratings of Instruction [SRI] survey (a measurement instrument used by students to assess instruction in courses in which they are currently enrolled) was used. The application of the Cronbach's Alpha Reliability Model, in the study helps to find strong internal reliability [consistency] of the rating instrument used to comprehensively assess teaching quality. At the same time, the application of Principal Component Factor Analysis with Varimax Rotation also finds strong construct validity of the assessment tool used to evaluate faculty.

Research Paper

Another Locus Property of the Thomson Cubic

Mikhail Goldenberg* **
* Department of Mathematics, The Ingenuity Project Baltimore Polytechnic Institute 1400 W, Cold Spring Lane Baltimore.
** Adjunct Professor, Department of Mathematics, Towson University, York Road Towson.
Goldenberg, M., and Kaplan, M. (2013). Another Locus Property of The Thomson Cubic. i-manager’s Journal on Mathematics, 2(3), 32-37. https://doi.org/10.26634/jmat.2.3.2459

Abstract

Generalizing the concept of the symmedian point of a triangle we introduce the point called quasi-symmedian point and prove that the locus of quasi-symmedian points is the Thomson cubic.

Article

Collections Of Statements Related To Point-Set Domination Numbers In Graphs

D. R. Robert Joan*
Assistant Professor, M.Ed. Department, M.E.T. College of Education, Chenbagaramanputhoor, Tamilnadu, India.
Joan, D.R.R. (2013). Collections of Statements Related to Pointset Domination Numbers in Graphs. i-manager’s Journal on Mathematics, 2(3), 38-49. https://doi.org/10.26634/jmat.2.3.2460

Abstract

Let G be a connected graph. A set D V(G) is a point-set dominating set (psd-set) of G if for every set S V – D, there exists a vertex v D such that the subgraph induced by S {v} is connected. The point-set domination number γ (G) p of G is the minimum cardinality of a psd-set. This paper provides a comprehensive treatment of point set domination in graphs. First introduce the point-set domination number of a graph G, and determine this number for various known graphs. The relationship between set domination number with r point set domination number, point-set domination number and also few results regarding point-set are given as statements. Also In this paper the investigator say about global set-domination number γ and global point-set domination number γ of a graph G and determine these sg pg numbers for various known graphs and obtain some bounds for the graph G of diameters 3 and 4 in terms of γ. Finally the concept of the strong point-set domination number of a graph G is introduced, and its exact value is determined for some known graphs.