ICACT 2018
http://repository.kln.ac.lk/handle/123456789/18944
2024-03-29T13:39:20ZAn Initial Study on Understanding the Effect of Questions Structure on Students' Exam Performance
http://repository.kln.ac.lk/handle/123456789/19014
An Initial Study on Understanding the Effect of Questions Structure on Students' Exam Performance
Wijesinghe, S.; Irosha, K.P.C.; Rupasinghe, T.
The main challenge in evaluating students’ performance is creating effective assessments which appraises students’ learning rather than their memory power and the practice. According to education theories, creative and carefully designed assessments can clearly evaluate the degree of learning in students. “Scaffolding” which refers to the degree to which a question guides the student through the problem-solving process is a widely used method in aiding students’ learning and conceptual understanding and assessing students’ performance in Science and Technology education. The objective of the current study was to understand the impact of exam question structure on the performance of first year undergraduates specifically focusing on understanding the effect of scaffolded questions. In the current Sri Lankan science education context, there is only a limited number of research studies that are available which provides an insight into the relationship between students’ performance and question features. Current study which was designed to address this issue was conducted as a part of the Chemistry for Technology course at the Faculty of Computing and Technology, University of Kelaniya, Sri Lanka. In this study, two different structures of the same questions were given to students as a part of an in class quiz. First one was a direct question and the second version (scaffolded question) included the same question in a step by step manner and in the latter version, students had to answer several steps to solve the problem. Marks obtained for the two versions were averaged and compared to investigate whether there is any significance of the structure of the questions towards the performance of students. Average mark for the scaffolded question was 82(±20) and the direct question was 71(±35). According to the results, it was clear that the students meet a considerable difficulty in the understanding the direct questions and the scaffolding of questions results in an increase of the performance of students. According to preliminary data, it can be concluded that scaffolding of questions preferentially assist students performance at examinations and surface features such as the structure of the question can play a key role in students’ performance at the examinations. Further studies are currently being conducted to understand whether there is any specific correlation between the improvement in performance as a consequence of scaffolding with the gender, school district and students’ English literacy.
2018-01-01T00:00:00ZTechnology Enabled Formative Assessment in Medical Education
http://repository.kln.ac.lk/handle/123456789/19013
Technology Enabled Formative Assessment in Medical Education
Youhasan, P.; Sanooz, A.R.M.
Technology enabled assessment is a novel pedagogical approach which has emerged into Medical educational practice. The main aim of formative assessment is to drive learning through constructive feedback. Kahoot is a free, real-time, game based, Web2.0 learning platform which is widely accepted to conduct formative assessment. The aim of this study was to explore the students’ perception on using Kahoot as a formative assessment tool at Eastern University Sri Lanka. A total number of 61 third year medical students participated in this cross sectional descriptive study following a pharmacology formative assessment conducted via Kahoot. The student perceptions on Kahoot experience was evaluated by a selfadministered questionnaire which consisted 10 perception statements. The participants asked to rate the statements by using 5-point Likert scale, ranging from 1 (Strongly disagree) to 5 (Strongly agree). Descriptive statistics was computed to present students’ perception. This study revealed that most of the students (83.6%) felt happy with Kahoot experience in conducting the formative assessment and (95.1%) of them recommended Kahoot for formative assessment in future. Majority of the participants (>90%) agreed or strongly agreed that Kahoot increases the focus on subjects, provides fun during learning, motivates to learn and is an effective method for active learning and providing feedback. The general outcome shown in this study derived from the students gives Kahoot a place as a tool to enhance the learning and to provide feedback. The free availability, feasibility, the technical simplicity and the enjoyable attitude from the students towards this application make this as a practical tool in Technology Enabled Assessment.
2018-01-01T00:00:00ZVoltage Sag Compensation using Dynamic Voltage Restorers: A Performance Analysis
http://repository.kln.ac.lk/handle/123456789/19012
Voltage Sag Compensation using Dynamic Voltage Restorers: A Performance Analysis
Senevirathne, K.M.P.C.B.; Ariyawansa, K.A.; Abeynayake, P.G.; Dampage, U.
Voltage sags are considered to be one of the most severe and frequent power disturbances occurring in the power system. The electronic devices used today are very sensitive to power quality, any disturbance in the power supply will negatively affect end user equipment. In order to overcome these voltage sags, implementation of a dynamic voltage restorer (DVR) has been proposed to compensate for voltage sags. Hence this technology can provide power regulation as well as power quality improvement. Electric vehicle (EV) batteries, connected in a vehicle-to-grid (V2G) system, act as the power source to the DVR, offering feasibility as well as mobility in delivering energy, thereby making it an ideal choice for energy storage used for improving power quality. This paper presents a simulation, using MATLAB, on the performance of a Dynamic Voltage Restorer (DVR) which utilizes energy from the batteries of Electric Vehicles (EV) as its power source.
2018-01-01T00:00:00ZInvestigation of the Degradation Processes Effect on the Properties of the Industrial Cutting Tool used in Packaging Process
http://repository.kln.ac.lk/handle/123456789/19011
Investigation of the Degradation Processes Effect on the Properties of the Industrial Cutting Tool used in Packaging Process
Voloshyna, A.; Romaniuk, S.
The paper investigates the metal structure carbide inhomogeneity of the cutting tool made from high-alloy steel, used in industrial process of packaging candies, after its service life period. The chemical composition of steel is current: C - 2.2%, Si - 0.4%, Mn - 0.35%, Cr - 12.12%, Fe - 84.8%, Mo - 0.12%. The increased content of carbon and chromium leads to the formation of an amount of special doped carbides in the composition structure. Accordingly to the X-ray diffraction analysis, it was detected that the type of carbides conforms to Cr7C3. The amount of carbides and their size were determined with the computer program ThixometPro. As indicated by the metallographic analysis of the separate zones of the tool, the size and the number of special doped carbides differ in the images of the metal structure. Therefore, the structure of the middle part and at the edge of the operating surface were comparatively analyzed. The total amount of carbides in the middle part of the tool structure equals 14.4% of the metal matrix and reaches 8.15% at the edge of the operating surface. The structural inhomogeneity and the presence of large doped carbides were detected in the middle zone, wherein, the share of small carbides is 20.8% of the total volume of the carbide phase. There is a lack of large special carbides and the area of 69.2% carbides is not exceeding 4.75 µm at the distance up to 100 µm from the edge of the working surface. Moving further from the edge, the area and volume of carbides increase. The carbide inhomogeneity along the cross-section occurs as a result of doped carbides crushing under the stresses action during the service life. From the working surface edge to the depth dispersed carbides are lining up at an angle of 45º, forming centers of crack initiation. In virtue of the analysis, it is recommended to apply an additional hardening by the PVD method to stabilize the operating surface layer under the deformation.
2018-01-01T00:00:00Z