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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1611 Survey on Study Partners Recommendation for Online Courses Snehal D.Nanaware1, Prof. Mrs. G. J. Chhajed2 1Student of Computer Engineering, Pune University VPKBIET, Baramati, India 2 Assistant Professor of Computer Engineering, Pune University VPKBIET, Baramati, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Massive open onlinecourses(MOOCs)providefree learning occasion for worldwide learners. In MOOCs each student or learner complete interaction with the course material takes on the web. The xMOOCs can eliminate teacher student interaction and involve limited student student interaction. The xMOOCs use automated testing to check students understanding. Thestudentscanfaceproblemduring learning process like they could not be solved any problem or difficulties by discussing with classmates. The task of study partner recommendation for students based on both content information and social network information they help for improving the completion rate. By analyzing the content of messages posted by learners in course discussion, help to investigate the learner behavior features. The proposed topic model used to measure learners course knowledge responsiveness and to compute similarity over topics among learners. The recommendation of study partner depends on the high topic similarity and high relationship strength to target learner. The recommendation will help to improve the chance to solve problems which encounter during learning process and keep their learning interest. Key Words: MOOCs, xMOOCs, Topic Model, Behavior Model, Recommendation. 1. INTRODUCTION Massive Open Online Courses (MOOCs) is an open courses provide free learning occasion for worldwide learners without barriers to entry, cost education criteria. Currently, there are two different types of MOOCs: cMOOCs and xMOOCs. The c in cMOOC stands for connectivist in which learning happens within a network and the learners use digital platforms such as social media platforms like blogs, wikis for making connections with course content. The learners can create and construct knowledge bythemselves. The xMOOCs help to eliminate teacher-student interactions and involve limited student-student interactions. xMOOCs focus on targeted short- length videosratherthanfull-length lectures and use automated testing to check understanding of students as they work through the content. Millions of different professional backgroundsandmotivationslearners can gather together from different countries in the same classroom. In MOOCs the learners can face problem like low compilation rate with large enrollment. The Many reasons can cause the low completion rate such as insufficient time for learners and language barrier for non-native speaking learners. Researchers in higher education eld try to use social network analysis to help solve problems which occur in there higher education[5]. Thesemethodsfocusedonhow to improve teaching quality by importing social networking into traditional teaching classrooms or analyzing relationship between students in the same class. The aim of this topic is to provide methods to recommending study partners for students in the same xMOOCs course. To establish a behaviour model which describe learners behavior features by analyzing theircourseactivitiessuchas posts and comments[11]. A topic model with term dictionary which helps to compute the similarity over topics among courses. A social network for all active students constructed through communication among learners in the course forum. Torecommendedstudy partners with high topic similarity and high relationship strength to the target learner.Therecommendationwill help to improve the chance to solve problems which learners encounter during the learning process and then keep their learning interest. 2. METHODS OF FRIEND RECOMMENDATION Recommendation systems can be divided into two areas: object recommendation and link recommendation [15]. To recommend study partners to a course learner is similar to recommend a friend to a user in social network. A “friends- of-friends” (FOF) method is most widely used in link recommendation. There are three main methods in the friend recommendation system. 2.1 Collaborative Filtering Based : Collaborative filtering (CF) recommendation suggests items for people based on users who are alike with them. The friends-of-friends method canbaseontheideasin collaborative filtering. The reason why one person adds a new friend is complicated. For example, one may accept a new friend because there sameschool orsamecityorsimilar interests and so on. CF-based friend recommendations system based on personality matching. A CF-based framework offers a list of friends to the user by leveraging
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1612 on the preference of like-minded users, with a given small set of people that the user has already labeledasfriends[13]. Collaborative Filtering is the process of filtering items using the opinions of peoples. This filtering is done by using profiles. Collaborative filtering techniques collect data from profiles, and determine the relationships among the data according to similarity models. The data in the profiles include user preferences, user behavior patterns, or item properties. Advantages: 1. Collaborative filtering not requires contents to be analyzed. 2. Collaborative filtering Algorithms does not spend time on developing language, analyzing document, it focus on the clustering algorithms. Disadvantage: 1. Setting threshold for rating if the value of rating is greater than the threshold. 2. The rarely-rated entities are adjusted by pulling them closer to an expected mean. The collaborative filtering algorithms are categorized as: 1. Memory based Recommendation: Memory based Recommendationbased ondata atthetimeof making memory based learning. In memory based learning users are divided into groups based on their interest. If new user comes into system then todetermineneighborsofusers to make predictions. Memory based recommendation uses sample of user item database to make predictions[12]. Fig. 1 Block Diagram Memory based Recommender system Advantages: 1. Selected neighbours are combined with rating to make prediction. 2. Recommendation Based on the users interest. Disadvantages: 1. The rating must be accurate for making prediction 2. Model based collaborative filtering: Model based collaborative filtering is a two stage processfor recommendations. 1. In the first stage model is learned offline 2. A recommendation is generated for a new user based on learned model. The model based collaborative filtering basedonMDPbased algorithms and latent semantic models. A) MDP based collaborative filtering: Recommendations are viewed as a sequential optimization problem in MDP based collaborative filtering algorithms. It uses Markov decision processes(MDP)model forgenerating recommendations. B) Latent semantic collaborative filtering models: Latent semantic collaborative filtering models used latent class variables in a mixture model to discover the user communities and prototypical interest. The decomposition of user preferences performs using overlapping user communities. Latent semantic collaborativefilteringmodels technique achieves high accuracy and scalability ascompare to memory based methods[9]. 3. Hybrid collaborative filtering techniques: The hybrid collaborative filtering system is combined with other recommendations techniques like content based filtering. Content based recommendation system based on the content of textual information like URLs, logs, item description and profiles. Demographic recommendation system based on userprofile informationsuchasoccupation, gender to make recommendations Utility based recommenders and knowledge based recommendation system based on knowledge about how a particular object satisfies user needs. A) Hybrid recommenders combining collaborative filtering algorithms: Hybrid collaborative filtering recommendations is combination of memory based collaborative filtering algorithms and model based collaborative filtering algorithms. The performance Hybrid collaborative filtering algorithms is better that than memory based and model based collaborative filtering algorithms.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1613 B)HybridRecommenders IncorporatingCFand Content- Based Features: The content boosted collaborative filtering algorithm is based on naive bayes classifier. The classifier classifies content and fills in the missing values of rating matrix with the predictions of the content predictors. The boosted collaborative filtering recommendation performance is better than memory based and model based collaborative filtering algorithms. 2.2 Content Based Recommendation : A content-based recommendation approach analyze a set of documents of items previously rated by a user, and build a model or profile of user interests based on the features user. The profile of user represents user interests, adopted to recommend new interesting items. The recommendation process consists in matching up the attributes of the user profile and the attributes of a content object[6]. CONTENT ANALYZER:- Item descriptions coming from Information Source are processed, that extracts features from unstructured text to produce a structured item representation, stored in the repository PROFILE LEARNER :– To collect data of user and generalize this data, in order to construct the user profile. The user interest check starting from items liked or disliked in the past. FILTERING COMPONENT – In this module the user profile suggest relevant items by matching the profile representation against that of items to be recommended. Fig. 2 Architecture of a Content-based Recommender system Advantage: 1. User independence. 2. Content transparency. Disadvantage: 1. Limited content analysis 2. Content-based recommenders have no inherent method for finding something unexpected. 2.3 Graph Based Recommendation: Graph based recommendation approach is based on friends local features or global features of graph such as common neighbor, Jaccards coefficient, shortest path, and Katz coefficient in the graph. This method helps to predict users home locations based on users social graph, profile and compared several local similarity measures[4]. The relationship between learners represented byweighted directed graph. The simple network of learners is – Fig.3 Simple network graph In graph the student C and D connected directly to neighbor E, and student A and B are in-direct neighbor of E. Unlikethe FOF recommendation node E is connected by A's both friends and user B is the best recommendationbecauseof its strong connection with user D. Advantages: 1. Recommendation based on the network graph so no need to any techniques. Disadvantages: 1. The weight and score depend on the graph. 2. Constructing the graph for each user must be needed.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1614 III. LATENT DIRICHLET ALLOCATION (LDA) MODEL:- Latent Dirichlet allocation (LDA) is a topic model that generates topics based on word frequency from a set of documents. LDA is particularly useful for findingreasonably accurate mixtures of topics within a given document set. Fig.4 Graphical presentation of LDA Figure makes clear, this model is not a simple Dirichlet- multinomial clustering model. In such a model the innermost plate would contain only Wn . the topic node would be sampled only once for each document; and the Dirichlet would be sampled only once for the whole collection[7]. Iv. CONCLUSION The study partner recommendation inxMOOCscourseshelp students to finish their learning process, improve the course completion rate create learners interest. The LDA model with term dictionary can producequality andrelevantfriend recommendations than LDA model, in addition to provide individuals behavior feature and understanding of course concept. The primary issue leading to not high enough recommendation accuracy is due to the lack of more specific behavior data of students. V. REFERENCES [1] Bin Xu,and Dan Yang, “StudyPartenersRecommendation for same xMOOCs Learners”,Research article, 2015. [2] ] X. Chen, M. Vorvoreanu, and K.Madhavan,Miningsocial media data for understanding students learning experiences”, IEEE Transactions on Learning Technologies, no. 3, pp. 246259, 2014. [3] J. Jiang, C. Wilson, X. Wang et al, Understanding latent interactions in online social networks”,ACMTransactionson the Web, vol. 7, no. 4, article 18, 2013. [4] J. Naruchitparames, M. H. Gunes, and S. J. Louis, Friend recommendations in social networks using genetic algorithms and network topology,inProceedingsoftheIEEE Congress of Evolutionary Computation (CEC 11), pp. 22072214, June 2011. [5] Z. Du, L. Hu, X. Fu, and Y. Liu, Scalable and explainable friend recommendation in campus social network system, in FrontierandFutureDevelopmentofInformationTechnology in Medicine and Education, vol. 269 of Lecture Notes in Electrical Engineering, pp. 457466, Springer, Amsterdam,The Netherlands, 2014. [6] L. Bian and H. Holtzman, Online friend recommendation through personality matching and collaborative filtering, in Proceedings of the 5th International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM11), pp. 230235, IARIA, 2011.IEEE Trans.on Neural Sys. and Rehab. Eng., 10(4):209-218. [7] D. Liben-Nowell and J. Kleinberg, The link prediction problem for social networks, in Proceedingsofthe12thACM International Conference on Information and Knowledge Management(CIKM 03), pp. 556559, November 2003. [8] D. Xu, P. Cui,W. Zhu, and S. Yang, Find you from your friends: graph-based residence location prediction forusers in social media, in Proceedings of the IEEE International Conference on Multimedia and Expo (ICME 14), pp. 16, Chengdu, China, July 2014. [9] M. Manca, L. Boratto, and S. Carta, Producing friend recommendations in a social bookmarkingsystem bymining users content, in International Conference on Advances in Information Mining and Management (IMMM 13), 2013. [10] Z. Wang, J. Liao, Q. Cao, H. Qi, and Z. Wang, Friend book: a semantic-based friend recommendation system for social networks, IEEE Transactions on Mobile Computing, 2014. [11] G. Balakrishnan and D. Coetzee,“Predicting student retention in massive open online courses using hidden markov model” [Ph.D.thesis], 2013. [12] C. G. Brinton,M. Chiang, S. Jain, H. Lam, Z. Liu, and F.Wong, “Learning about social learning in MOOCs: from statistical analysis to generative model”, IEEE Transactions on Learning Technologies, 2014. [13] A. Anderson, D. Huttenlocher, J. Kleinberg, and J. Leskovec,”Engaging with massive online courses”, in Proceedings of the ACMInternational Conference on WorldWideWeb (WWW14),pp. 687698, 2014. [14] D. J. Hruschka and J. Henrich, “Friendship, cliquishness, and the emergence of cooperation”, Journal of Theoretical Biology, vol. 239, no. 1, pp. 115, 2006. [15] Z. Du, L. Hu, X. Fu, and Y. Liu,” Scalable and explainable friend recommendation in campus social network system”, in Frontier and Future Development of Information Technology in Medicine and Education, vol. 269 of Lecture Notes in Electrical Engineering, pp. 457466, Springer, Amsterdam,The Netherlands, 2014.
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