Malinka Ivanova

Technical University of Sofia | TU · Faculty of Applied Mathematics and Informatics

The design of analog circuits is a complex and repetitive process aimed at finding the best design variant. It is characterized by uncertainty and multivariate approaches. The designer has to make different choices to satisfy a predefined specification with required parameters. This paper proposes a method for facilitating the design of analog ampl...

The tremendous rise of electrical energy demand worldwide has led to many problems related to efficient use of electrical energy, consequently posing difficult challenges to electricity consumers of all levels—from households to large companies’ facilities. Most of these challenges could be overcome by the accurate prediction of electricity demand....

The manufacturing processes and the control systems for automatic production lines mainly are evaluated through usage of statistical methods as recently machine learning algorithms are also used. The aim of the paper is to present an approach for control measurement systems evaluation, based on a combination of statistical techniques like attribute...

The aim of the paper is to present a two-step method for facilitating the design of analog amplifiers taking into account the bottom–top approach and utilizing machine learning techniques. The X-chart and a framework describing the specificity of analog circuit design using machine learning are introduced. The possibility of libraries with open mac...

Learning performance is related to students’ learning activities during a learning process. Their learning behavior could lead to successful course accomplishment or not, to better or worse final marks. Seminar practices have their impact on development of some students’ competences like: topics analysis, discussion and presentation and the planned...

The paper presents an approach for predicting the power dissipation in electronic circuits through utilization of support vector machine, which is an algorithm from controlled machine learning. Three predictive models are created, outlining the power dissipation at different values of power supply and load resistance. The models are evaluated consi...

The chapter discusses the current state of science education in Bulgaria, taking into account some factors like: geographical location, population, cultural characteristics, technological development, economics, educational system, and international collaboration. The performed exploration shows that the science education in Bulgaria, following the...

Todays, learning analytics is a vital component in the concept of intelligent education. Analytical tools give many benefits for educators and enable a smart educational process. Our research hypothesis is that learning analytics will provide essential information for achieving adaptable learning paths, better learning performance, and as a result...

The paper presents an exploration of the role of mobile technology for the realization of personalized learning and for improvement the students’ learning performance within an intelligent educational environment. The two of the created predictive models show the patterns and anomalies in students’ learning behavior and their learning performance....

The paper presents an analysis and summary of the current research state concerning the application of machine learning and fuzzy logic for solving problems in electronics. The investigated domain is conceptualized with aim the achievements, trending topics and future research directions to be outlined. The applied research methodology includes a b...

Fuzzy logic is successfully used in the area of control systems where different problems are decided in flexible way leading to more efficient systems’ performance. Such approach is suitable when the modeled system is complex and some parameters cannot be defined precisely. In this paper a fuzzy model of improved cooling water control system utiliz...

Machine learning proposes innovative methods for students' learning analysis and new ways for modeling the learning process and its realization. Learning analytics takes advantage of this fact and processes data according to accepted or emerging algorithms that leads to creation of analytical and predictive models. Learning performance is connected...

Utilization of machine learning in electronics and in computer-aided design is in progress, giving an opportunity the electronic circuits to be studied in a new way that also contributes to automation of some engineering tasks. In this paper, a novel methodology for analysis and design of Gm-C filters is presented. It is based on applying classific...

The paper presents a novel method and conceptual architecture for implementation of fuzzy-classification expert system in the domain of rehabilitation methods for cerebral palsy. The expert system includes two blocks: Fuzzy block utilizing fuzzy algorithms for multi-criteria decision making and Machine learning block based on algorithms for tree cl...

Nowadays, a big part of eLearning applications is web-based, designed with integrated interactive multimedia objects and extensive information exchange among clients and servers. This requires appropriate security measures to be taken to protect users, infrastructure and databases from a variety of threats and attacks. The paper presents the develo...

The aim of the paper is to explore the relationship between students’ creative ability and learning performance through solving classification problems. The data is gathered via survey tool that is online delivered to students from College of Energy and Electronics at Technical University of Sofia. Dataset is used for decision-making models creatio...

Modelling in support of decision making in business intelligence (BI) starts with exploring the BI systems, driven by artificial intelligence (AI). The purpose why AI will be the core of next-gen analytics and why BI will be empowered by it are determined. The role of AI and machine learning (ML) in business processes automation is analyzed. The be...

The goal in this paper is to present a method for predictive analysis of Operational Transconductance Amplifiers behavior in frequency domain applying regression algorithms. The exploration is performed applying linear regression, additive regression and transformed regression algorithms for solving regression tasks and linear and logistic regressi...

Abstract. In this chapter, we address security and privacy aspects in TeSLA, from a technical standpoint. The chapter is structured in three main parts. Firstly, we outline the main concepts underlying security in TeSLA, with regards to the protection of learners' data and the architecture itself. Secondly, we provide an empirical analysis of a spe...

The paper treats an application of predictive modeling in the field of mobile learning. A methodology to facilitate the realization of a model predicting the most utilized research topics that are close to the term mobile learning is developed. The constructed model is based on machine learning technique and fuzzy logic method and it predicts the i...

eLearning is fast progressing scientific field proposing novel and specific approaches in a range of domains. It is well established practice in universities, schools and organizations for delivering interactive, adaptive and flexible training, taking advantage of contemporary and emerging technologies. Informatics is a continuously evolving scienc...

The Covid-19 pandemic led to an unprecedented situation, when education worldwide moved online, leading to what is called Emergency Remote Teaching. Finalized one month after the suspension of face-to-face activities in schools and universities, this paper aims to capture the actions taken in Romania for the continuity of education in online enviro...

Computer-aided design and manufacturing is related to usage of a wide variety of technologies for performance of engineering tasks like: analysis, planning, design, simulation, diagnostics, optimization, producing. The integration of CAD /CAM and AR system play an important role in achieving proper understanding of the 2D and 3D graphical objects m...

Machine learning proposes innovative methods for students' learning analysis and new ways for modeling the learning process and its realization. Learning analytics takes advantages from this fact and processes data according to accepted or emerged algorithms that leads to creation of understandable analytical and predictive models. Learning perform...

Open Educational Resources (OERs) contributes to ways for knowledge sharing and reusing among given scientific and academic societies. The students and teachers have rapid and unlimited access to content, prepared for different purposes and digital formats. Many projects have been started to extend and improve the existing digital collections. A fe...

Learning analytics is a new evolving research area that deals with data generated during students’ interactions with an online learning environment. The collected and analysed information chunks regarding their behaviour, performance and preferences could be used for improvement and optimization of teaching, learning and assessment. The aim of the...

In this chapter, we address security and privacy aspects in TeSLA, from a technical standpoint. The chapter is structured in three main parts. Firstly, we outline the main concepts underlying security in TeSLA, with regards to the protection of learners’ data and the architecture itself. Secondly, we provide an empirical analysis of a specific depl...

The paper presents a review and analysis concerning the contemporary state of the Internet of things in the context of the global legal challenges that stay in front of the main participants in the processes of manufacturing, delivering and utilization of content and services. The key recommendations regarding the enhancement of existing legislatio...

Trust in eAssessment is an important factor for improving the quality of online-education. A comprehensive model for trust based authentication for eAssessment is being developed and tested within the score of the EU H2020 project TeSLA. The use of biometric verification technologies to authenticate the identity and authorship claims of individual...

Personal Learning Environments (PLE) as an approach to technology enhanced learning emphasizes the shift of control and ownership from the educator or the designer of a learning environment to the user or the learner. While more and more private data is created and shared on the Internet, more and more enterprises, government agencies and marketers...

The learning process consists in memorizing knowledge, knowledge analysis and organization, knowledge application in practice. Its enhancement is still a challenging issue that provokes a wide variety of approaches. This paper suggests a solution for the enhancement of the learning process in different courses through students’ self-testing and sel...

Trust in eAssessment is an important factor for improving the quality of online-education. A comprehensive model for trust based authentication for eAssessment is being developed and tested within the scope of the EU H2020 project TeSLA. The use of biometric verification technologies to authenticate the identity and authorship claims of individual...

For online and blended education institutions, there is a severe handicap when they need to justify how the authentication and authorship of their students are guaranteed during the whole instructional process. Different approaches have been proposed in the past but most of them only depend on specific technological solutions. These solutions in or...

SPSS-16.0 и Excel, като конкретно е приложена демографска статистика, честотно разпределение, изведени са средните стойности по отделните фактори и направени някои корелации. В изработената обучителна програма на първо място са заявени теми, свързани с овладяването на комуникативни умения, умения за работа с агресивни родители, умения за разговори...

The increasing use of web services, the proved advantages of service-oriented architectures and continuously appliedattacks to them require utilization of given secure mechanisms that ensure the security at different levels. The aim of thepaper is to summarize the existing threats and attacks to web applications and web services. Contemporary secur...

This work is performed in the scope of the TeSLA (An Adaptive Trust-based e-assessment System for Learning) project with the aim to investigate existing problems and solutions in e-assessment implemented in the engineering education, to present an overview of the best existing practice and to propose a blended assessment model consisting of offline...

This was a paper in plenary sesion of the Conference Ëducational Technologies 2016. The aim of this paper is to present the research work of Technical University of Sofia for e-assessment processes in blended learning environment according to the frame of TeSLA project. In the focus of TeSLA project is design and development of an adaptable e-asses...

Massive Open Online Courses (MOOCs) initiatives involve a huge amount of learners over the world proposing achievement of new knowledge or advancing in a given subject. A wide variety of MOOCs platforms hosting free courses are established offering different technology tools in support of teaching and learning. The paper presents a comparison of MO...

Massive Open Online Courses (MOOCs), as a new educational trend, attract worldwide a huge number of learners giving them appropriate knowledge according to personal needs. Learners are stimulated to be active participants and facilitated to create distributed learning communities through: sharing opinions and setting preferences; analyzing, annotat...

Massive Open Online Courses (MOOCs), as a new educational trend, attract worldwide a huge number of learners giving them appropriate knowledge according to personal needs. Learners are stimulated to be active participants and facilitated to create distributed learning communities through: sharing opinions and setting preferences; analyzing, annotat...

In spite of the fast development of eLearning and distance learning in our countries (Romania and Bulgaria), the MOOC (Massive Open Online Courses) phenomenon is not popular enough among educational actors: teachers, researchers, students, lifelong learners or policy makers. More specifically MOOCs are not integrated in the area of higher education...

The paper explores the features of different learning environments realized through multimedia, hypermedia and transmedia. Also, the students' opinion is gathered to understand their point of view about the role of multimedia support in their learning and about their vision of a contemporary multimedia application. A model of an effective multimedi...

Open Educational Resources and Massive Open Online Courses as e-bricks for Smart Cities Authors: Carmen Holotescu, Gabriela Grosseck, Laura Malita Nowadays when more than half of the world's population lives in urban areas, when information and (mobile) communication technologies are real catalysts for innovations in all domains, there are a lot of...

Right now the open education is reality, distributing high quality free for use knowledge over the world. Open Educational Resources (OERs) are shared in a wide variety of forms and sizes - from a learning instruction to open courses and virtual laboratories. An initiative, starting in 2001 with an announcement of Massachusetts Institute of Technol...

Intelligent Tutoring is applied as a supportive tool in decision making, problem solving, knowledge receiving. Adding computer vision for affect recognition leads to the adaptation of tutor behavior not only to the cognitive level of a student but also to his emotional state that could improve quality of learning. In this paper the current research...

A wide variety of educational practices are supported through Augmented Reality (AR) technology achieving high level of engagement and motivation that are central concepts in different learning theories. AR is adopted in classroom sessions as well as in outdoor activities using desktop, web-based or mobile applications. It is a suitable supplementa...

The use of hashtags in Twitter messages is growing among the educational community for various reasons. Exploring and understanding how hashtags can facilitate learning and self-learning organization is the main aim of this paper. Several online available tools for hashtags management are examined and their recognition and utilization can assist kn...

This paper presents the results of an exploratory study examining bachelor degree students’ experiences of learning with a new generation learning management system Edu 2.0 combined with Web 2.0 applications. The authors discuss students’ perceptions of formal and informal activities within this environment as captured through a collection of surve...

Purpose ‐ The aim of this paper is to identify the main social competencies that future engineers need to become recognized professionals. In the paper the key competencies for contemporary engineers are examined and the focus is given on the importance of social competencies for professional development. A competency research model is developed ta...

Enhancement of e-learning systems by using semantic web technologies is one of the main trends in modern e-learning. In resent years many research projects have been developing to study ontologies as a tool for giving intelligence to e-learning solutions. The aim of this paper is to explore a wide range of resent ontology-based e-learning approache...

The activities of teachers in social networks have a certain place in their personal advancement and professional progress. Studying the organization of Personal Learning Networks (PLN) could support the optimization of teachers' efficacy and productivity. For this purpose, an analysis is performed after a literature review and taking into consider...

The paper presents an investigation focused on directions for a course library list forming based on the collective intelligence of the most influential Twitter users. Our main aim is to answer the question whether and how Twitter posts may be used to facilitate the learning process. Billions of messages and users are tracked, extracted and analyze...

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This paper presents the results of an exploratory study examining bachelor degree students’ experiences of learning with a new generation learning management system Edu 2.0 combined with Web 2.0 applications. The authors discuss students’ perceptions of formal and informal activities within this environment as captured through a collection of surve...

In this paper the experience gained at using low-cost interactive marker augmented reality (AR) technology during course Computer graphics is presented. The preliminary exploration of AR technology adoption for learning enhancing and understanding of spatial spaces is done and several benefits are identified and analyzed via a model. Software and t...

This paper presents the results of an exploratory study examining bachelor degree students’ experiences of learning with a new generation learning management system Edu 2.0 combined with Web 2.0 applications. The authors discuss students’ perceptions of formal and informal activities within this environment as captured through a collection of s...

The Semantic Web technologies have been used in many educational projects over the last few years. As ontologies are the best known knowledge representation mechanism, allowing both humans and machines to model and work with knowledge, their usage in eLearning systems is of great importance for achieving a high quality learning and authoring proces...

In this paper the experience gained at using low-cost interactive marker augmented reality (AR) technology during course Computer graphics is presented. The preliminary exploration of AR technology adoption for teaching support and learning enhancement is done and several benefits are identified, summarized and analyzed via a model. Two learning sc...

The paper explores the possibilities for automation of the authoring process in the Web 2.0 platform. The cloud computing strategy that incorporates various computer technologies is discussed from the point of view of the educators/authors. The authoring process as the sequence of actions that the authors perform utilizing applications and services...

The development of Personal Learning Environments (PLEs) is in the scope of research groups and educators aiming to propose suitable mechanisms for the organization of self-controlled and self-directed learning, providing students with tools and services for access to content and human intelligence inside and outside the educational institutions. T...

The Google Wave is a communication, collaboration and rich media document creation platform that is in focus of educators and researchers, because of its capable to be harnessed for educational purposes. The paper discusses characteristics of Google Wave those facilitate creation of personalized learning spaces accessible to students anywhere and a...

The paper explores the functionalities of eight start pages and considers their usefulness when used as a mashable platform for deployment of personal learning environments (PLE) for self-organized learners. The Web 2.0 effects and eLearning 2.0 strategies are examined from the point of view of how they influence the methods of gathering and captur...

Main objective of the presented work deals with design, modelling and characterization of new micro machined GaAs and GaN based hot plate thermal converters, which are considered to operate with high temperature metal oxide gas sensors, that can analyse various gases, such as CO, H2, NOx and hydrocarbons. The thermal and mechanical properties of Ga...

The paper presents the results of an exploratory study that examines the experiences bachelor degree students gained from learning with a learning management system from new generation Edu 2.0. The main functional characteristics and available social tools of Edu 2.0 are examined in the context of students learning support. A model of Learning area...

The building of Personal Learning Environment (PLE) that supports learner to set learning goals and to manage learning is related to creative and innovative activities. But more challenging is the forming of Professional Learning Network (PfLN) that can be used for facilitation of knowledge absorption, assimilation and dissemination not only in for...

The aim at this paper is to describe and analyze the experience gained in deployment of learning ePortfolio using Web 2.0 tools and services in a social-oriented network like Ning. The functionalities of social software for learning enhancement and for facilitating and stimulating the active participation and communication of each learner are explo...

The knowledge is defined as combination and organization of data and information in given context and Knowledge Management (KM) provides capturing, storing and reusing of knowledge objects. In Web 2.0 world the knowledge is represented in form of microcontent object and KM 2.0 proposes creation, sharing and leveraging the microknowledge in a collab...

The paper describes the experience gained in building the reusable multimedia course in electronics. Teaching electronics for electrical engineering has been very much limited to traditional classroom instruction environment and multimedia is one approach for creating engaging and attractive content. The same content can frequently be reused in dif...

This paper explores the functionalities of the start pages and considers their usefulness for deployment as learning and research environments for self-organized learners. The start pages' comparative analysis is done according to created criteria, focused on availability of the authoring, syndicated information, communication, collaboration and ne...

The purpose of ultrawideband /UWB/ amplifier is to amplify the signal with little distortion and little additional noise. The design of efficient UWB amplifiers is a process that requires precise report on conditions and networks of signal propagation. Very important is defining of the amplifier parameter: ratio of the signal-to-noise /SNR/, which...

This paper describes a project started at the Technical University of Sofia Research & Development Laboratory "E-Learning Technologies" and examines implementation of Learning Design in Shareable Content Object Reference Model (SCORM), open source based e-learning environment ATutor. For increasing the quality of the e-learning courses and to impro...

Digital learning object repositories are the catalogues of the e-learning era. They are the fundamental first step in knowledge discovery and object exchange. They provide the foundation for eLearning, eWork and eCommerce in the knowledge market. This is why nowadays they are of priority interest. In Technical University – Sofia (TUS) arise a need...

The present paper describes a project started at the Technical University of Sofia Research & Development Laboratory "E-Learning Technologies" aimed at a Learning Design Module (LDM) development as a part of authoring tool in open source based Shareable Content Object Reference Model (SCORM) – compliant e-learning environment. The design methodolog...

In the paper is proposed developed Service-Oriented Architecture (SOA) to support the processes of managing Learning Design (LD) and their supporting materials, including also repositories and editing tools. The Architecture resuscitates developed Learning Design Module (LDM) and gives it full functionality as integrates it with open source-based S...

In the paper the new possibilities of eLearning 2.0 management systems for knowledge production, experience sharing and communication are presented. The Web 2.0 effects and mechanisms for knowledge capturing and construction are discussed. Reviews of seven new generation learning systems are done with aim one of them to be selected for knowledge bu...