Ana Sovic Krzic

Ana Sovic Krzic
University of Zagreb Faculty of Electrical Engineering and Computing

Doctor of Engineering

About

52
Publications
8,404
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305
Citations
Additional affiliations
December 2006 - present
University of Zagreb
Position
  • PostDoc Position

Publications

Publications (52)
Article
Full-text available
RoboCupJunior is a project-oriented competition for primary and secondary school students that promotes robotics, computer science and programing. Through real life scenarios, students are encouraged to engage in robotics in order to help people. One of the popular categories is Rescue Line, in which an autonomous robot has to find and rescue victi...
Article
Contribution: Understanding pupils’ conceptualization of robots and programming can help teachers to avoid a disconfirmation experience by selecting more appropriate educational tools, robot designers in improving the robot design, and researchers in further improvement of the field. Background: Human–robot interaction (HRI) is affected by the ac...
Article
Full-text available
An image or volume of interest in positron emission tomography (PET) is reconstructed from gamma rays emitted from a radioactive tracer, which are then captured and used to estimate the tracer’s location. The image or volume of interest is reconstructed by estimating the pixel or voxel values on a grid determined by the scanner. Such an approach is...
Article
Full-text available
The quality of a teaching method used in a classroom can be assessed by observing the facial expressions of students. To automate this, Facial Expression Recognition (FER) can be employed. Based on the recognized emotions of students, teachers can improve their lectures by determining which activities during the lecture evoke which emotions and how...
Chapter
Educational robots are recognized in English language teaching (ELT). Working on the development of the concept Robot-Assisted Language Learning in Croatia, this study aimed to get insight into pupils’ perspectives, thus investigate perceptions, ideas, and preferences for such implementation. This kind of input could be used while designing future...
Chapter
This study reasons that the sounds robots produce consequentially bring up the noise level in the classroom that might not benefit learning, and the perception of such sounds can impact the acceptability of the robot. Therefore, the consequential sounds of six different educational robots were studied on affective sound quality, and perception rela...
Preprint
Full-text available
As implied by many and explicitly stated by Florida (2002), „human creativity is the ultimate economic resource.“ However, just like human knowledge, which is one of the preconditions for creativity to occur, creativity does not happen out of thin air. It has its foundations, triggers and constituents. The aim of this conceptual paper is to discuss...
Conference Paper
In this paper, an educational robot that can be controlled and programmed over the internet and a simple computer game of marbles are presented. The robot was made from Fischertechnik set and controlled with Arduino Uno, connected over the cloud using mBlock 5. The robot and most of the game were prepared before the workshops with students. Student...
Conference Paper
Full-text available
As implied by many and explicitly stated by Florida (2002), „human creativity is the ultimate economic resource.“ However, just like human knowledge, which is one of the preconditions for creativity to occur, creativity does not happen out of thin air. It has its foundations, triggers and constituents. Consequently, it can be developed and fostered...
Conference Paper
Full-text available
As social media grows, more and more users are disseminating hate speech through their posts. This often comes as a consequence of feeling a false security and anonymity in virtual environment. To stop hate speech spreaders, researchers started developing machine learning systems that automatically detect spreaders of hate speech based on the conte...
Chapter
In this paper we present a method for automatic assessment of the correctness of a solution for a task solved in the visual programming language for Lego Mindstorms EV3. The first step in the proposed method is to translate the solution into its textual representation using image pattern matching and optical character recognition. The second step i...
Conference Paper
In this work in progress paper we present an example of innovative practice in organizing informal STEM education workshops with young children. The workshops were divided into two learning scenarios, unplugged programming and hands-on robot play. Unplugged programming encourages understanding of the core concepts of programming such as algorithms...
Chapter
In this paper, a pilot study of using robots in teaching native language is presented. The goal of the study is to find activities with educational robots that can be used in everyday classes. Robots were used as a tool to check the understanding of the read stories in two activities: as actors in a role play and as vehicles in a race. The technica...
Chapter
In this paper we present our experience in organizing a robotic summer camp for pupils from 9 to 15 years old. During the camp, participants had to solve a number of robot construction and programming tasks, designed in a way that encouraged them to develop their creative thinking and problem solving skills, like creating a robot from a pre-defined...
Article
Full-text available
Shortcomings of the correlation coefficient (Pearson's) as a measure for estimating and calculating the accuracy of predictive model properties are analysed. Here we discuss two such cases that can often occur in the application of the model in predicting properties of a new external set of compounds. The first problem in using the correlation coef...
Preprint
An image or volume of interest in positron emission tomography (PET) is reconstructed from pairs of gamma rays emitted from a radioactive substance. Many image reconstruction methods are based on estimation of pixels or voxels on some predefined grid. Such an approach is usually associated with limited resolution of the reconstruction, high computa...
Conference Paper
Full-text available
For a number of years, various games have been used as an educational tool at different academic levels, especially in primary education. However, only recently games that teach coding and algorithmic thinking or even broader, computational thinking, emerged. Initiatives like Hour of Code and similar online activities or block-based programming gam...
Article
In this paper, L1 minimization refers to finding the minimum L1-norm solution to an overdetermined linear system y = X·p. The underdetermined variant of the same problem has recently received much attention, mainly due to the new compressive sensing theory that shows, under wide conditions, the minimum L1-norm solution is also the sparsest solution...
Conference Paper
Full-text available
This paper presents our experiences from workshops with gifted primary school students (grades 2–4) especially in programming with robotics sets (Lego Mindstorms EV3) and other technology. As a part of extracurricular enriched program at the Center for Gifted Child Development in Zagreb, Croatia, we organized a number of robotics and ICT workshops....
Article
Full-text available
Actual economic crisis initiated numerous debates on fiscal policy of the European Union (EU) and unrealistic convergence demands placed upon the Member States, where the emphasis is on fiscal criteria: The budget deficit should not exceed 3% of Gross Domestic Product (GDP) and the public debt must be less than 60% of GDP. The aim of this article i...
Conference Paper
Full-text available
Riverbed topography is characterized by different bedforms, such as ripples, dunes, standing waves and antidunes. Geometrical properties of bedforms are dependent on hydraulic flow conditions and on characteristics of riverbed material. Occurrence of the bedforms can significantly influence the drag component of resistance to flow and therefore pre...
Article
This paper focuses on pattern matching in the DNA sequence. It was inspired by a previously reported method that proposes encoding both pattern and sequence using prime numbers. Although fast, the method is limited to rather small pattern lengths, due to computing precision problem. Our approach successfully deals with large patterns, due to our im...
Article
Full-text available
We present a novel method for restoration of images of nanostructures obtained with a soft-ray microscope that uses a 46.9 nm soft x-ray laser microscope for illumination. To suppress the noise and to preserve the image sharpness, we develop a method based on pixel adaptive zero-order modeling of the observed object. Neighboring areas of each pixel...
Article
'SUZA - from school to science and the academic community' is the official popularization program for science, technology, engineering and mathematics at University of Zagreb, Faculty of electrical engineering and computing. Volunteers in the program are professors, researchers and students from the Faculty. Although, the program is relatively new,...
Article
Image sharpness assessment is a very important issue in image acquisition and processing. Novel approaches in no-reference image sharpness assessment methods are based on local phase coherence (LPC), rather than edge or frequency content analysis. It has been shown that the LPC based methods are closer to human observer assessments. In this paper,...
Article
Compact representation of signals and images is a key for many applications. Compactness is often achieved through linear transforms with good energy concentration property. We present an adaptive wavelet filter bank with fixed number of vanishing moments, plus additional local adaptation. Proposed adaptation method is conducted at each sample acco...
Article
Full-text available
We present advanced techniques for the restoration of images obtained by soft x-ray laser microscopy. We show two methods. One method is based on adaptive thresholding, while the other uses local Wiener filtering in the wavelet domain to achieve high noise gains. These wavelet based denoising techniques are improved using spatial noise modeling. Th...
Conference Paper
Full-text available
In this paper, we present five different approaches of teaching 8-years-old children basic concepts of programming and fundamentals of computing. Using mechanical calculators, children learn some of the basic computer architecture and functionality concepts like the accumulator, counter and register shifting. The marble adding machine teaches binar...
Conference Paper
Many microscopy images, or 3D depth maps can be represented using piecewise constant models. They usually contain noise due to sensor imperfectness. In this paper, an improved separable denoising method based on the relative intersection of confidence intervals rule is proposed. The method uses median averaging and is robust to outliers and differe...
Conference Paper
In this paper, the relative intersection of confidence intervals (ICI) rule is used to adaptively determine window sizes around each observed point in purpose of denoising. The relative ICI rule defines neighbourhoods of similar statistical properties for every signal sample. If we calculate a mean value on each window, it corresponds to the zero-o...
Conference Paper
Classroom interactivity is today considered to be one of the most important preconditions for successful lecturing. It is also often considered to be the main drawback of learning from lecture captures. In this article, the issue of live lecture and lecture capture interactivity is addressed from the aspect of students' question posing. During seve...
Article
Besides many advantages of wavelet transform, it has several drawbacks, e.g. ringing, shift variance, aliasing and lack of directionality. Some of them can be eliminated by using wavelet packet transform, stationary wavelet transform, complex wavelet transform, adaptive directional lifting-based wavelet transform, or adaptive wavelet filter banks t...
Conference Paper
Full-text available
Spectral analysis and wavelet analysis of successive flood waves on the basis of measured water levels help to understand hydrological processes and to improve hydrological modeling. In this paper, we compare Fourier transform, short time Fourier transform and continuous wavelet transforms to describe behavior of River Sava. Urban, agricultural and...
Conference Paper
Sparse representation of signals is the key for many applications, such as denoising, compression, or compressive sensing. In this paper, we propose an original adaptive wavelet filter bank that, for a class of signals, provides better compaction of information. Previously reported 1D and 2D point-wise adaptive wavelets were based on minimization o...
Article
Denoising is an important issue in signal processing. Noise, caused by sensors or by quantization effects during digitalization or compression, can significantly influence the processing results. Hence, removing the noise, or extracting the signal with minimal distortion is a valuable objective for many applications. In this paper, we propose a nov...
Article
Full-text available
In this paper, an adaptive separable 2D wavelet transform is proposed. Wavelet transforms are widely used in signal and image processing due to its energy compaction property. Sparser representation corresponds to better performance in compression, denoising, compressive sensing, sparse com-ponent analysis and many other applications. The proposed...
Conference Paper
Full-text available
Students of the first year of master program “Electronic and Computer Engineering” of the Faculty of Electrical Engineering and Computing of Zagreb University are challenged to leverage their theoretical knowledge with real-life assignments they are likely to be involved with after the graduation.
Article
With the online resources becoming common, one can ask what the limitations are when applied to online examinations. Standardised multiple‐choice questions (MCQs) test are commonly used either as a tool to enable student self‐examination or as a tool to test large number of students in a more efficient way. However, the means of delivery and what o...

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