Christo Dichev

Christo Dichev
Winston-Salem State University | WSSU · Department of Computer Science

About

113
Publications
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2,720
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Publications

Publications (113)
Article
Full-text available
The majority of user models in gamification are based on user’s gamer personality. However, the motivations driving individuals’ learning behavior differ from their motivations when playing. There is no evidence that learners’ experiences in gamified activities are described by these models. Thus, an alternative model capturing learners’ motivation...
Conference Paper
Full-text available
Gamification is increasingly advocated as a solution to motivational challenges across learning activities. However, given a particular learning activity, the question of how to choose relevant motivational affordances and how to incorporate them within the activity in order to evoke the desired motivational effect remains an open problem. To addre...
Article
Gamification in education primarily aims at increasing learners’ motivation to engage in given learning activities and thereby promote desired learning behaviors. Despite its potential and the increasing number of gamified systems their success is still limited due to the fact that gamifying learning is a challenging process. Part of the challenge...
Conference Paper
Gamification in education still lacks systematic studies assessing its impact on learning. This poster will present the design of our empirical studies on the effect of various combination of game elements on student motivation and engagement in CS courses.
Conference Paper
Having to compete harder than ever for students' attention against cool social media sites, mobile apps, video games, messaging, etc., instructors are struggling to find new ways to motivate and engage learners. Gamification offers a promising framework for educational interventions that can increase students' motivation and engagement. This BOF wi...
Conference Paper
Full-text available
Although many CS courses require extensive practice, a large number of students show low motivation for engaging in non-graded, self-directed learning activities. To address this problem, we developed OneUp - a highly configurable course gamification platform that enables instructors to tailor the gamification features to fit their preferences. Thi...
Article
Gamification of education is still evolving. It lacks systematic studies assessing its effect in different learning contexts. Creating gamified courses is still difficult, since there is a lack of sufficient understanding of how to gamify learning and appropriate software support is missing. As a response to these challenges, we developed OneUp ̶ a...
Conference Paper
Two faculty teams worked to develop significant content that could be presented in a variety of contexts to students with interests in many areas. This poster reports on the opportunities and the challenges encountered.
Conference Paper
Data Science, often described at the intersection of computer science, statistical thinking and analysis, and subject matter expertise, has seen an exponential growth in the past few years. Courses (and entire programs) have been appearing at such a fast rate at most institutions of higher education, as well as some high schools, that comparisons b...
Conference Paper
The low performance and drop-outs in Computer Science classes are frequently attributed to lack of engagement and motivation. Meanwhile, gamification - the application of game design principles and game mechanics to a non-game context -- increasingly attracts the interest of educators due to its potential to foster motivation and behavioral changes...
Conference Paper
Participants in this Birds-of-Feather session will share thoughts and experiences in offering an introductory course in this exploding field. It will be the third consecutive year that these facilitators will conduct a SIGCSE session on a first course in Data Science. The interest in the field has increased greatly over the years, and attendees of...
Article
Full-text available
The growing importance of data competency implies that adequate Data Science course offerings should be available to all students regardless of their interests, backgrounds and intended major. This paper describes the design and implementation of a course targeted at a non-technical audience and centered on data science literacy, with a focus on co...
Conference Paper
Full-text available
Gamification of education is still evolving. It lacks systematic studies assessing its effect in different contexts. Creating a gamified course is still time-consuming and design limited. As a response to these challenges, we developed OneUp Learning ̶ a customizable platform aimed at facilitating the process of gamifying learning activities and en...
Article
Full-text available
Gamification of education is a developing approach for increasing learners’ motivation and engagement by incorporating game design elements in educational environments. With the growing popularity of gamification and yet mixed success of its application in educational contexts, the current review is aiming to shed a more realistic light on the rese...
Conference Paper
There is good evidence that students learn better when given more opportunity to practice skills using related problems. However, this requires a sufficient supply of automatically graded problems to enable instant feedback. This can be achieved through automating the process of problem generation. While a few dynamic problem generation systems exi...
Conference Paper
In this poster the authors report on experiences in teaching an introductory course in Data Science at two different institutions. Their approaches were informed by the aims of their NSF-funded project: to provide insight on learning goals, central data science topics, content modules, and a framework for implementing a flipped classroom approach t...
Conference Paper
The use and analysis of large quantities of data have become ubiquitous in nearly every discipline. We began a discussion of the role of data science across disciplines, and the role of computing in data science programs, at SIGCSE 16. The session was well attended and the discussion was valuable. Since then, more work has been done and more people...
Conference Paper
Full-text available
In this paper we present work-in-progress on developing an educational game for teaching Stacks as part of a Data Structures course. We first present a review of the published related work and then describe our approach to the development of the Stack game. As an essential part of the design, we discuss in detail the requirements to the game. We al...
Conference Paper
The paper presents a statistical exploration of the use of resources in Bulgarian educational site UCHA.SE based on the user logs and information on students’ interactions stored directly in the site database. This research aims at revealing gaps between the demand and supply that suggest possible improvement of the content and help identifying gro...
Conference Paper
Data Science programs are emerging in many areas and are related to many disciplines. This includes sciences, social sciences, business, journalism, history, and any other area dealing with massive amounts of data. People may understand that the quantity of data now available has changed the nature of research and has begun to impact the way studen...
Conference Paper
Full-text available
The presented here instructional model is based on two premises derived from psychological and learning theories. The first is that students take greater control on their own learning, which implies active learning where the instructor acts as a mentor. The second is that the learning environment enables interplay between the extrinsic forces actin...
Chapter
As part of the EC FP7 project “AComIn: Advanced Computing for Innovation”, which focuses on transferring innovative technologies to Bulgaria, we have applied educational data mining to the most popular Bulgarian K-12 educational web portal, UCHA.SE. UCHA.SE offers interactive instructional materials—videos and practice exercises—for all K-12 subjec...
Conference Paper
Full-text available
As Data Science gains in importance in industry, government and society, the creation of appropriate courses and teaching activities is necessary for building up a competent workforce. In this paper, we describe our experience of the development of a low-level undergraduate introductory Data Science course. The course is without prerequisites and m...
Conference Paper
In this poster the authors report the approaches for presenting Data Science topics in Flipped Classroom mode, incorporating topics in Data Science into existing courses as well as in stand-alone courses. It provides an insight on listing of learning goals, central data science topics, content modules, and a framework for implementing a flipped cla...
Book
This book constitutes the refereed proceedings of the 17th International Conference on Artificial Intelligence: Methodology, Systems, and Applications, AIMSA 2016, held in Varna, Bulgaria in September 2015. The 32 revised full papers 6 poster papers presented were carefully reviewed and selected from 86 submissions. They cover a wide range of topic...
Conference Paper
Full-text available
This paper presents a follow-up of a systematic mapping study of the empirical research on applying gamification to education, covering the period July 2014-June 2015. Its goal is twofold: to complement the previous survey by reviewing the papers published within the last year and to identify the shifts and emerging trends in this research field by...
Conference Paper
This paper presents a study on two aspects of Computer Science and Information Technology Open Educational Resources (CS/IT OER) conducted in the CS OER Portal, a reference repository of CS/IT open educational resources. The first aspect focuses on the scope, scale and progress of CS/IT OER development. Here we present a statistical characterizatio...
Article
Full-text available
The world is embracing an open education model. The success of this process implies an adequate awareness, an assumption that is inconsistent with recent reports and statistical facts. Despite major advances in recent years, Open Educational Resources (OER) are still not in the mainstream of Computer Science course development. Motivated by the nee...
Article
Full-text available
While gamification is gaining ground in business, marketing, corporate management, and wellness initiatives, its application in education is still an emerging trend. This article presents a study of the published empirical research on the application of gamification to education. The study is limited to papers that discuss explicitly the effects of...
Article
Full-text available
This paper addresses the challenges of teaching rapidly evolving academic disciplines and argues about the necessity of incorporating self-directed learning in areas where knowledge and skills change fast. We propose a teaching method, which aims at increasing students' engagement and involvement in the learning process. To foster self-directed lea...
Article
Full-text available
Gamification - the use of game design elements in non-game contexts - has seen rapid adoption in various areas in recent years. Its application in education is particularly promising, due to its potential to shape user behavior in desirable directions through increasing user motivation and engagement. This work-in-progress paper presents a course g...
Article
Full-text available
Learning is a goal driven social activity determined by motivational factors. To be able to efficiently gamify learning for improved student motivation and engagement, the educators have to understand the related aspects studied in games, motivational psychology and pedagogy. This will help them to identify the factors that drive and explain desire...
Conference Paper
Full-text available
The CS OER Portal was created with the goal of improving the findability and increasing the use of open educational resources in Computer Science. In this paper we describe the portal's design principles which exploit the domain specificity of the hosted content and are focused on enhancing the search and navigation in the portal. Distinctive retri...
Conference Paper
Full-text available
This paper addresses the problem of improving the findability of open educational resources (OER) in Computer Science. It presents a domain-specific OER reference repository and portal aimed at increasing the low OER use. The focus is on enhancing the search and navigation capabilities. A distinctive feature is the proposed query-by-navigation meth...
Article
Full-text available
Online learning is one of the fastest growing trends in Technology- Enhanced Learning (TEL). Technology in combination with an instruction that addresses the cognitive and social processes of knowledge construction could offer more diverse and effective online learning opportunities than their face-to-face counterparts. In this review we attempt to...
Article
Full-text available
The growing number of digital libraries providing open educational resources (OER) requires effective resource discovery mechanisms to optimally exploit the benefits of their openness. This paper discusses the OER repositories role and presents a study aimed at understanding how educators find OER by seeking answers to questions such as: what propo...
Article
Full-text available
Open content and open access to resources are important factors in the innovation of Computer Science education. This paper presents a study aimed at gaining an understanding of the needs of Computer Science educators in terms of Open Educational Resources (OER): what kind of resources they need, when they need them, how they use them, and what are...
Conference Paper
In this paper we propose a "find similar" method intended to extend the searching capabilities of digital collections targeting educational and academic domains. Given a document, the described algorithm finds similar documents that may be of interest to the user. It exploits the metadata typical for the participatory web. In the adopted model, doc...
Chapter
Full-text available
Availability and open access to resources is an important factor in educational development, but not a sufficient solution by itself. Open educational practices need to be fostered by an appropriate supportive environment including discoverable and shareable content, combined with tools for adaptation and redistribution. Although a number of open c...
Chapter
Full-text available
This paper focuses on the visualization and presentation of story This paper focuses on the visualization and presentation of story maps and suchlike narrative information in TM4Book, a Topic Maps-based semantic annotation tool for creative writing and textual maps and suchlike narrative information in TM4Book, a Topic Maps-based semantic annotatio...
Conference Paper
Full-text available
In this paper we propose an ontological framework for tools facilitating creative writing and story reading. It is based on an ontology implemented as a topic map and employs linguistic analysis methods for discovering conceptual entities in the text. Copyright © 2011, Association for the Advancement of Artificial Intelligence. All rights reserved.
Chapter
Collaborative tagging systems demonstrate the potential to generate collectively built organization structures forming the basis for social navigation and shared knowledge. The effectiveness of these systems for finding and re-finding information depends not only on the created tag structures but also on the ability to identify similar users. In th...
Conference Paper
Full-text available
This paper presents a new type of digital repositories based on a hybrid organizational structure that leverages the potential of domain specific collaborative tagging in combination with a taxonomy-driven classification. It is exemplified in Linked Course - a repository prototype for collaborative development, sharing and reuse of learning resourc...
Article
Collaborative tagging systems demonstrate the potential to generate collectively built organization structures forming the basis for social navigation and shared knowledge. The effectiveness of these systems for finding and re-finding information depends not only on the created tag structures but also on the ability to identify similar users. In th...
Conference Paper
Full-text available
This article investigates the effectiveness of community generated tags as social descriptors of resources uncoordinatedly annotated by community members. Our goal is to demonstrate practically that the aggregated tags applied to resources by the entire community define reasonably well resource meaning. This would allow using them for calculating s...
Conference Paper
Full-text available
Current collaborative tagging systems do not allow community members to easily view available data related to their communities. In this paper, we present our study on community formation centered around common interests, utilizing data from del.icio.us. We propose an approach to clustering tags and users based on their similarity. We also report s...
Conference Paper
This paper presents an approach to increasing the reusability of online course repositories by collecting and annotating learning content using consensually agreed vocabularies. It proposes support to courseware authors focused on two aspects: (i) providing means for creating ontological structures (to be used as a skeleton for structuring course r...
Conference Paper
Full-text available
The main objective of this work is to exploit the relationship between the information findability problem and a subject-based organization of information. Identification of a subject is involved when one wants to say something about that subject or when he or she tries to comprehend what was said by others about it. An example of this type of dual...
Conference Paper
This tutorial will provide the participants with substantial knowledge about topic maps, their concepts, their application, and how to develop topic maps. Designing an ontology is an integral and important aspect of every Topic Map application. Practical examples will be used in applying ontology modeling based on task requirements. Furthermore, a...
Conference Paper
Full-text available
Recent approaches to enhancing the quality of Web searches are based on associating metadata with the resources on the Web. Various metadata standardization initiatives have been created, including Dublin Core, and more recently the Semantic Web standards. Topic Maps are a Semantic Web technology for semantic annotation of resources, involving topi...
Conference Paper
Full-text available
The authors of topic map-based learning resources face major difficulties in constructing the underlying ontologies. In this paper we propose two approaches to address this problem. The first one is aimed at automatic construction of a "draft" topic map for the authors to start with. It is based on a set of heuristics for extracting semantic inform...
Article
Full-text available
The TM4L environment enables the development and use of ontology-aware courseware based on the Semantic Web technology Topic Maps. In this paper we discuss its features in the light of authoring support, giving illustrative examples to highlight its use. Keywords: Ontologies, digital libraries, courseware, Topic Maps. ACM Classification Keywords: H...
Conference Paper
In this paper we address the issue of defining and using views in information seeking tasks in the context of topic-centered learning repositories. We propose an extension of the topic maps model with views and an approach for a view-based retrieval that improves the search of relevant resources. We have implemented this extension in the educationa...
Conference Paper
Full-text available
In this paper we discuss the support for personalization in TM4L – an environment for building and using Topic Maps-based learning repositories. Our approach is based on the idea of using different views to access a learning collection depending on the context of its use. We propose an extension of the Topic Map model with contexts and discuss its...
Article
Full-text available
In this article, we describe TM4L, an environment for building, maintaining and using standards-based, ontology-aware e-learning repositories. It is based on the idea that concept-driven access to learning material implemented as a topic map can bridge the gap between a learner and targeted knowledge. One of the driving goals of this work is to inc...
Conference Paper
Full-text available
Task information support on the Web is not always an easy and straightforward process. Much of the information is inaccurate, biased, out-of-date, or just not thorough enough. The Internet has emerged as an active resource for the average student. It has also provided a universal, yet independent, platform for educators for over a decade now. Conve...
Article
Full-text available
Ontologies are a key technology for achieving person-alization in the educational hypermedia. In this paper we discuss some common problems the authors of Topic Map-based learning content experience in building subject ontologies, i.e. in structuring and articulating the conceptual model of the intended online learn-ing material. The discussed prob...
Article
Full-text available
In this paper we discuss the contextual support provided in TM4L - an environment for building and using Topic Maps-based learning repositories. We propose an extension of the Topic Maps model with contexts and an approach for contextual retrieval of information. Our approach is based on defining context primitives and a simple language for express...
Conference Paper
Full-text available
In this paper we examine some problems related to capturing the structure and the topic name space of learning content in the context of topic map authoring. We demonstrate that the use of traditional course taxonomies as ontological resources is problematic. Based on these findings and on the results of a locally conducted study, we propose an emp...
Conference Paper
Full-text available
This paper explores the idea of using contexts to support more efficient information search in Topic Maps-based digital libraries. The notion of context is perceived as abstraction of grouping of domain concepts and resources based on the existing semantic relationships between them. The proposed model of context is used for context representation...
Conference Paper
Full-text available
TM4L is an e-learning environment providing editing and browsing support for developing and using topic maps-based digital course libraries. The TM4L functionality is enhanced by an interactive graphical user interface that combines a hierarchical layout with an animated view, coupled with context sensitive features. This paper discusses the visual...
Article
Full-text available
In this paper we propose a computational framework ori-ented towards e-learning applications and information seeking tasks. The notion of context is perceived as an ab-straction referring to "locality of connections" based on the existing semantic relationships between concepts. Its utili-zation is demonstrated within a context-aware information su...
Article
Full-text available
This paper presents a framework of context-centered digital course libraries founded on the Topic Maps paradigm and used for developing an authoring environment for building such libraries. We explore the idea of using contexts to support more efficient information search. The notion of context is perceived as abstraction of grouping of domain conc...
Article
Full-text available
In this paper we discuss the educational and research benefits of applying an innovative technology - Topic Maps - for organizing and retrieving online information in the context of Web-based courseware. Topic maps offer a standards-based approach to encoding expert’s domain and instructional knowledge, i.e. to building educational ontologies and c...