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Issue 9, Volume 4, September 2007
Print ISSN: 1790-1979
E-ISSN: 2224-3410







Title of the Paper: Usability Issues of Web-Based Assessment System for K-12 and Implementation of PAS System


Authors: Yongchul Yeum, Wongyu Lee

Abstract: Web-Based Assessment (WBA) System for K-12 needs to support the educational assessment according to the process-oriented learning and instruction. Usability issues of the Web-Based Assessment (WBA) System for K-12 refer to how to make questions efficiently, and how to control the access to the final Html test files from unauthorized people. In this paper, we study the usability issues of the antecedent WBA system and additional attributes based on PBA model (offline paper-based assessment); changing the current test class, applying Html access key value, and using studentís school identification such as individual name, class, an examinee's number for logging into the WBA system. Finally, we design and implement web-based online evaluation system, called PAS (PBA-based Assessment System), according to the usability issues discussed in this study. As a result, an instructor can make assessments more frequently and conveniently.

Keywords: Examinations and Tests via Internet, Web-Based Assessment System, Usability and Accessibility

Title of the Paper: Experimental Measuring System with Rotary Incremental Encoder


Authors: Dorina-Mioara Purcaru, Elena Niculescu, Ion Purcaru

Abstract: The output signals of the rotary incremental encoder are used for motion sense discrimination, angular displacement and rotational speed measurement of the encoder shaft. The angular displacement can be measured with different resolutions. This paper presents an experimental system that enables the study of the rotary incremental encoder: working modes and methods for resolution improvement, displacement and speed measurement, sense discrimination. It is an intelligent measuring system that consists in one rotary incremental encoder, an IBM-PC compatible computer, an intelligent interface (with 80C552 microcontroller), a mechanical subsystem and a driving module. This experimental system is very useful in higher education and research activities because it illustrates how the same sensor can measure different physical variables, it enables the application of different knowledge (about sensors, signal conditioning and processing, microcontrollers, computers, analogue and digital circuits, motors and their electric control etc.), a soft method for resolution improvement and sense discrimination can be studied and verified, an industrial application of the rotary incremental encoders can be studied step by step. Many experimental results are presented to highlight the usefulness of this experimental measuring system.

Keywords: Rotary incremental encoder, education, measuring system, displacement, resolution, industrial application.

Title of the Paper: Online Pair-Programming for Learning Programming of Novices


Authors: Soojin Jun, Seungbum Kim, Wongyu Lee

Abstract: The purpose of this study is to determine the effects of online pair programming for novices. This paper describes two system designs for online pair programming: real-time synchronous pair programming and non-real-time asynchronous pair programming. An experiment was conducted to test the feasibility of online pair programming, using Squeak eToys as an educational programming language. Nebraska of Squeak eToys, a toolkit for building remote interactions with morphic (object-oriented and visual) projects in Squeak eToys, was used for sharing learnersí screens and input devices, such as the keyboard and mouse. In this experiment, the following were compared: co-located pair programming, distributed pair programming, and individual programming, through the statistical analysis of their task scores; and a number of creative ideas and their scores in the final test, using T-test, ANOVA F-test, and post-comparison. The results showed that distributed pair programming is not significantly different from co-located pair programming, and that pair programming is more effective than individual programming. In addition, based on the studentsí sentiments and class observations, several suggestions are given herein, such as environments or teaching methods in online pair programming. The importance of communication, authority control, and peer pressure in online pair programming is also discussed in this paper. In conclusion, the results of this experimental research show that educators can be helped in designing effective learning systems for online pair programming.

Keywords: Programming Learning, Pair Programming, Squeak, Novices, On-line Learning

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