Jun 4, 2020   4:46 a.m. Lenka
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Ing. Jakub Mačina
Identification number: 52628
University e-mail: qmacina [at] stuba.sk
External colleague - Faculty of Informatics and Information Technologies (STU)

Final thesis

Basic information

Basic information about a final thesis

Type of thesis:
Diploma thesis
Thesis title:
Recommendation of New Questions in Online Student Communities
Written by (author): Ing. Jakub Mačina
Thesis supervisor:
Final thesis progress:
Final thesis was successfully defended.

Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:English

Slovak        English

Title of the thesis:Recommendation of New Questions in Online Student Communities
Student’s performance in Massive Open Online Courses (MOOCs) is enhanced by participation in discussion forums or recently emerging Community Question Answering (CQA) systems. Nevertheless, the problem is low engagement of students in question answering which leads to many unanswered questions in discussion tools. The goal of the master’s thesis is to propose a new approach for a routing of new questions for CQA systems employed in educational settings. Existing approaches for question routing recommends new questions only to a few experts, which is not suitable in MOOCs because participation in discussions positively influences student’s learning outcomes. We proposed a novel approach for question routing which models along user’s expertise for a given question also user’s willingness to answer a question. The predictions based on these two models are combined and the list of recommended users is optimized by a workload constraint. Furthermore, we incorporated non-QA data from the course for user modelling, such as student’s grades and activity in the course, which help in routing new questions to greater part of the student community. The proposed question routing approach was fine-tuned and evaluated by the offline experiment and the online experiment which measured total impact on the student community. Online experiment was conducted using A/B test in CQA system used by a course at the EdX platform. The proposed question routing method outperformed a baseline question routing method commonly used on the open Web by 4.96% in click-through rate and by 5.30% in S@10.
Key words:
Recommender systems, Machine Learning, User Models

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