<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD v1.0 20120330//EN" "JATS-archivearticle1.dtd">
<article xmlns:xlink="http://www.w3.org/1999/xlink">
  <front>
    <journal-meta>
      <journal-title-group>
        <journal-title>J. Jebeile, “Explaining with Simulations: Why Visual Representations Matter.” Perspectives on
Science</journal-title>
      </journal-title-group>
      <issn pub-type="ppub">1063-6145</issn>
    </journal-meta>
    <article-meta>
      <article-id pub-id-type="doi">10.1162/POSC_a_00273</article-id>
      <title-group>
        <article-title>Virtual Laboratory as Custom E-learning Implementation and Design Solution</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Bohdan Sus</string-name>
          <email>bnsuse@gmail.com</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Ilona Revenchuk</string-name>
          <email>ilona.revenchuk@nure.ua</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Oleksandr Bauzha</string-name>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Sergiy Zagorodnyuk</string-name>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>Taras Shevchenko National University of Kyiv, Kyiv 01033, Ukraine Kharkiv National University of Radio Electronics</institution>
          ,
          <addr-line>Kharkiv 61166</addr-line>
          ,
          <country country="UA">Ukraine</country>
        </aff>
      </contrib-group>
      <pub-date>
        <year>2019</year>
      </pub-date>
      <volume>26</volume>
      <issue>2</issue>
      <fpage>282</fpage>
      <lpage>291</lpage>
      <abstract>
        <p>Carrying out high-quality training in the conditions of quarantine restrictions puts forward new actual tasks for carrying out practical laboratory works and activities. Model of Implementation Online-Education Systems for Educational Process Supporting at the high education institutions and schools has been discussed. The problem of the development software of virtual laboratory work is relevant, because preparing high-quality virtual laboratory work is a time-consuming task for the natural sciences. E-learning laboratory work are mainly remote and should be integrated with Learning Management System for more effective learning process. A set of three hierarchical models with learning objectives, level of complexity and specificity have been taking into account in the implemented Learning Management System. Learning objectives in the cognitive, affective and sensory domains are related with Blooms taxonomy.</p>
      </abstract>
      <kwd-group>
        <kwd>1 Online Education Systems</kwd>
        <kwd>E-learning</kwd>
        <kwd>Supporting Technology</kwd>
        <kwd>Learning Management System</kwd>
        <kwd>Virtual Learning Environment</kwd>
        <kwd>Virtual Classes</kwd>
        <kwd>Virtual Laboratory</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body>
    <sec id="sec-1">
      <title>1. Introduction</title>
      <p>
        In e-learning, important attention is paid to interactivity, which provides feedback to the student's
learning in automatic mode [
        <xref ref-type="bibr" rid="ref3">3</xref>
        ]. However, in most cases, the emphasis is on learning materials
available on the Internet, rather than on communication between teachers and students.
      </p>
      <sec id="sec-1-1">
        <title>3. Assessment Tools</title>
      </sec>
      <sec id="sec-1-2">
        <title>4. Authoring Tools</title>
      </sec>
      <sec id="sec-1-3">
        <title>5. Learning Content</title>
      </sec>
      <sec id="sec-1-4">
        <title>Management Systems (LCMS)</title>
      </sec>
      <sec id="sec-1-5">
        <title>Management System</title>
        <p>(MS)</p>
      </sec>
      <sec id="sec-1-6">
        <title>1. Student</title>
      </sec>
      <sec id="sec-1-7">
        <title>Management System</title>
      </sec>
      <sec id="sec-1-8">
        <title>2. Knowledge</title>
      </sec>
      <sec id="sec-1-9">
        <title>Management System</title>
      </sec>
      <sec id="sec-1-10">
        <title>3. Competency</title>
      </sec>
      <sec id="sec-1-11">
        <title>Management System</title>
      </sec>
      <sec id="sec-1-12">
        <title>4. Human Resource</title>
      </sec>
      <sec id="sec-1-13">
        <title>Information System</title>
      </sec>
      <sec id="sec-1-14">
        <title>5. Enterprise Resource</title>
      </sec>
      <sec id="sec-1-15">
        <title>Planning System</title>
      </sec>
      <sec id="sec-1-16">
        <title>Online Education</title>
      </sec>
      <sec id="sec-1-17">
        <title>Systems</title>
      </sec>
      <sec id="sec-1-18">
        <title>1.Online Education</title>
      </sec>
      <sec id="sec-1-19">
        <title>2. Integrated Online</title>
      </sec>
      <sec id="sec-1-20">
        <title>Education Systems</title>
      </sec>
      <sec id="sec-1-21">
        <title>3.Online Education</title>
      </sec>
      <sec id="sec-1-22">
        <title>Systems</title>
      </sec>
      <sec id="sec-1-23">
        <title>4.E-learning</title>
      </sec>
      <sec id="sec-1-24">
        <title>5. Standards</title>
      </sec>
      <sec id="sec-1-25">
        <title>Specifications</title>
        <p>The term e-learning is very frequently using as a equivalent for online education. E-learning
contains a number of processes and applications, as instance Virtual laboratories and classrooms,
Web-based and computer-based learning, digital collaboration. Learning content or information is
mostly delivered over the Internet. Therefore, e-learning covers all systems where it is possible to
support it.</p>
        <p>
          For instance one of the models for online education is Jigsaw [
          <xref ref-type="bibr" rid="ref4">4</xref>
          ] and the other is many so different
Hub Models.
        </p>
        <p>The various online education systems must be able to share data and be integrated according to
these models. This is relevant for large-scale education systems. Besides content, an integrated
learning system - ILS includes tools for making tests, notes, reports, and student files that help to
identify and evaluate a monitoring progress of learning via students competences and needs.</p>
        <p>
          For example, a number of standard specifications have been developed within the "IMS project" to
facilitate the growing requirements for data exchange and integration. To specify and describe the
metadata of IMS training resources, the uniform method was developed [
          <xref ref-type="bibr" rid="ref5">5</xref>
          ].
        </p>
        <p>
          Teachers and developers use the CCT tool to create content for online training courses. This tool is
used to develop learning materials such as drawings, simulations, animations, text, slides, graphics,
audio, video and assessments. Copyright development tools can also be classified as a subset of CCT.
Software applications that use a metaphor (algorithm or book) to create online courses by
nonprogrammers are described in [
          <xref ref-type="bibr" rid="ref6">6</xref>
          ].
        </p>
        <p>Workflow management procedures for collaboration within a common environment are provided
in the LCMS. This computer program is used to service from a central interface to create tutorials and
publications, modify and edit content, organize, and delete. It is used for blended learning and the
online learning process, creating learning materials and content. As a modular building material for
elearning content, the Learning Object is used. It is a media-independent, reusable, piece of
information. To increase efficiency, learning objects are stored in a data warehouse such as LCMS
and organized by a metadata classification system. In general, more attention is paid to the creation,
development, and management of content for online courses, but less attention is paid to the control of
students' experience in content management systems.</p>
      </sec>
    </sec>
    <sec id="sec-2">
      <title>2. LMS and Management System</title>
      <p>A course management system (CMS), a virtual learning environment (VLE), a virtual learning
system (VLS), a learning platform, or an e-learning portal are commonly referred to as LMS. The
determining factor is the software that supports the administration of courses in the learning
environment, the development and administration of courses, assessment of the level of knowledge in
full-time, online learning, or blended learning. In an educational institution, it can be integrated with
other software systems and tools. Institutions use LMS software to plan the learning process,
implement and evaluate, and support the organization of learning. Important elements are supporting
the access of teachers and students, monitoring student learning and assessing the learning process.</p>
      <p>Besides this, the software provides educational content and resources according to the standards or
templates during course preparation. Conducting and monitoring student activities during training,
such as teamwork, discussion, tasks, assessments is centralized. All these activities will control by the
virtual environment of LMS that provides user data protection.</p>
      <p>To identify patterns that may suggest ways to make the learning process more effective for
students, all typical information about the learning process in the learning system can be analyzed.
LMS Administrator and teachers have access to information about student activities and it helps to
improve their educational schedules and more effectively develop delivery guidelines and courses, to
make communication and collaboration, and improve the clear and understanding system for student
assessment.</p>
      <p>The most popular LMS software is Moodle, Desire2Learn, Blackboard by Angel and WebCT,
Instructure Canvas, Sakai and Pearson LearningStudio.</p>
      <p>Each LMS is different and it gives to users different possibilities for implementation such as
content-oriented, activity-oriented, network-oriented, linear, and branching. Some systems realize
asynchronous instruction, while others provide only synchronous directions.</p>
      <p>Some LMS deliver content to students by the means of the mobile technologies, others are using
only web-application. That is why organizations need to identify the approaches used and choose the
most effective to promote learning at their institutions. Then, they should explore the LMS tools and
features and how they will be used. So, selecting a convenient LMS depends on different components.</p>
      <p>Between two systems LMS and LCMS a few key exceptions, LMS is a system for managing
somebody and LCMS is a system for handling content creation, but both of them create a learning
environment.</p>
      <p>Software for the learning environment is developed as a comprehensive solution. For an
educational institution, this can make it easier to study online. However, in some cases, the ability to
track online courses that have not been created in this particular learning environment may be lacking.
The learning management system interface allows students to register and attend courses while
staying in that environment during the study. The program part contains sections for both self-study
and the academic model of a multi-week course. In this case, the group can perform the tasks weekly
with the help of the seminar teacher. The possibility of creating additional courses for the teacher is
provided in most learning environments.</p>
      <p>Software for commercial services, rent-based training programs and placement of educational
institutions. learning process management is provided by the LSP organization. An effective student
management system (SMS) is crucial for all educational institutions. Banner and PeopleSoft are
examples of such commercial SMS systems. These are the major systems of the educational
institution. It is used to manage critical information about organizations such as courses, faculty,
students and applications, admission, exams, testing, and payment. The national systems LADOK
(Sweden), STADS (Denmark), FS and MSTAS (Norway) are widespread in Scandinavian
universities.</p>
      <p>Human Resource Information Systems (HRIS) and Enterprise Resource Planning (ERP) systems
are either used by corporations and companies. These systems do not contain data on students but
employees. They contain important information about their employees and have the same functions as
SMS. There are many different types of LMS, or LCMS, to manage the learning process and course
content delivery. That way one is the important question is how to choose effective LMS or LCMS
according to the organization's needs. The main rule is to know how LMS will be deliver training
materials to students, and then compare your organization's needs with LMS opportunities by the
LMS functionality.</p>
      <p>For choosing LMS it is necessary to take into account some points.</p>
      <p>
        It is LMS free or commercial. Each of these has minuses and pluses [
        <xref ref-type="bibr" rid="ref6">6</xref>
        ].
      </p>
      <p>Ability of LMS to scale up or down quickly and easily. It means that LMS is hosted on an
organization’s servers, or as a Software-as-a-Service (SaaS) offering, which is hosted on the vendor’s
servers and is accessible from anywhere (the data is stored in “the cloud”). It depends on which type
of LMS will be used - commercial or non-commercial. A locally installed LMS offers users the ability
to individualize and customize their LMS. Therefore, if an organization already has an IT staff in
place that can administer the system, handle support and customization and scalability concerns, a
locally hosted LMS can be powerful. If not, a SaaS hosted platform may make more sense.</p>
      <p>Ability to create learning content in LMS without using LCMS is very important. Because, some
LMS is a tool for sharing and distribute program content, which should be created in the LCMS or
another additional application.</p>
      <p>Ability to integrate LMS with other applications your organization already uses, depending on
your organization’s needs.</p>
      <p>According to this information, you can use the matrix for LMS choosing (table2).</p>
      <p>First, you need to know the way your organization plans to organize online training and e-learning
- and also concentrate on how much flexibility you’ll need in the future. The other one is personal
teachers/staff knowledge and skills for using and support LMS or LCMS. Let discuss conditions for
teachers/staff learning and development for using all LMS or LCMS functionalities in the further.</p>
      <p>Explore the ratings, experience, skill sets, qualifications, customer support and background of the
LMS/LCMS providers during the selection process. Another important thing from LCMS/LMS
providers is customer support services 24/7. If you will have access to help, you need to get the
maximum advantage of your LCMS / LMS.</p>
      <p>There are many aspects to the adaptability and support of LMS / LCMS. The price first depends on
the technical specification requirements for implementing the LCMS / LMS strategy in the long run,
how often and / or regularly you need to update the LCMS / LMS or possibly adapt to the future
needs of your organization and how much it will cost.</p>
      <p>For understanding these all moments, the good way will be to use a trial version of the software.
How well the features and features fit into your learning and development, whether they need
scalability and usability, is easy to determine with a demo version.</p>
      <p>An LMS and/or LCMS system may be required to effectively organize the learning process and
the LMS / LCMS tracking function. It includes an analysis of student data, with the ability of the
effectiveness estimation of learning and determine changes or corrections in the course.
 The process of choosing the best LMS / LCMS for your company's training needs can take a
lot of time and money. Therefore, you need to know the answer to the questions in Table 2.
 Good service providers who have worked in your area are important because they know the
ways and topics of effective content delivery for a specific audience.
 Modern development of educational technologies testifies to the high popularity of online
teaching and learning. Many companies provide full-featured e-Learning and design web portal
services given the significant growth of educational technologies.
 The e-Learning contains:
 Virtual laboratory as Custom eLearning implementation and design solution for virtual class.
 Game-based learning - involving learners in interactive e-learning lessons, creating
coursebased game content.
 Streaming video - Video simplifies the study of difficult-to-understand topics.
 Virtual Classes - Virtual classes make it easy to learn at a convenient time for geographically
separated students.
 Online assessment - online assessment encourages students to test their level of knowledge in
the comfort of their apartment.</p>
    </sec>
    <sec id="sec-3">
      <title>3. Virtual laboratory as a design solution for virtual class</title>
      <p>LMS
+
+
+
+
+
+
+
+
+
+</p>
      <p>LCMS
+
1
+
+
+
+
+
+</p>
      <p>
        In STEM (Science, Technology, Engineering and Mathematics) education, work with simulators
and virtual laboratory work (VLW) occupies a leading place. Gaining experience with original
equipment is essential for students [
        <xref ref-type="bibr" rid="ref7">7</xref>
        ]. In fact, conducting an experiment and obtaining the result
without the aid of hardware laboratory equipment and devices allow essentially specialized computer
applications VLW.
      </p>
      <p>A VLW may have the characteristics of a virtual simulator in case the interactive model of such a
laboratory installation includes virtual instruments and controls, as well as appropriate mathematical
modeling tools that reproduce a practical experiment with a given accuracy. Appropriate computer
support of laboratory activity in the educational process is provided for conducting modern classes in
classrooms and laboratories, as well as for improving students' independent learning activities
[8,9,10,11,12].</p>
      <p>There are several projects for the development of remote laboratory work in the field of natural
sciences[13, 14, 15, 16]. A remote laboratory is a distributed computing environment that allows
students to conduct experiments, interacting with real devices, tools and mechanisms using a special
telecommunications platform [17, 18]. Laboratory activities are an integral part of the educational
process in higher education institutions in the study of natural sciences. Conducting laboratory work,
the student not only acquires fundamental knowledge but also acquires the necessary skills, which is a
requirement for its formation as a competent specialist [19, 20].</p>
      <p>Electronic laboratory work is used in different parts of the world. In particular, the use of
electronic laboratory work in medicine is considered in [21]. The research describes the practice with
medical devices using data exchange in cloud environments, the use of servers and real-time data
visualization. The main purpose of the examination is to consider ways to help students gain access to
virtual tools in the classroom. This goal includes the development, testing, implementation and
dissemination of training modules, teaching methods, didactical approaches based on the use of
virtual devices in natural sciences, such as chemistry, electronics, biology and physics. Students
mastering learning skills in a virtual laboratory (a striking example is the TEALSIM environment),
which uses not only virtual tools but also dynamic models of physical laws [22,23].</p>
      <p>Elements of gamification with modeling of dynamics of physical processes are realized in
laboratory work on materials science. The main objectives of the study are to ensure the highest
standards of e-learning. VLW is implemented at IT education classes for students of technical
disciplines. To achieve the main objectives of the study a special virtual simulator was implemented;
The main steps of the work include the following actions:
• choose an adequate measurement algorithm in the virtual simulator;
• create a software system of mathematical calculations and modeling for VLW.</p>
      <p>These steps have been successfully implemented and presented in developed VLW. Examples of
created VLW, simulations of virtual physical measurements were presented in [24]. As a result of our
study, some VLWs with adaptive algorithms were created. As an example, we will discuss VLW's
state-of-the-art electronic chip design technology. It provides the bulk lifetime measurement of charge
carriers in Silicon by the method of conductivity modulation.</p>
      <p>With this software, the operator can easily modify and update not only the product but also
existing elements specifically designed for this work and create new laboratory activities. Despite the
fundamental differences in these operating systems, the project functions on each of them. Unity user
interface is presented in fig. 2.
This virtual laboratory practice has been developed in the development environment “Unity”.</p>
      <p>In most cases, the amount of investigation efforts that can be determined by the tracking system
depends on ratings, feedback and gradual progression, current status, visibility, tables of leaders of
collective responsibility groups. This VLW combined with Moodle as one of the popular university
education systems. In fig. 3. a screenshot of measurements from electron microscopy is presented.
During the research in the virtual laboratory, there is the possibility of interactive interaction with
devices. The panels and buttons of the device, and other available elements, when activated, cause
interactive software scripts. To develop a virtual laboratory, a popular software tool for developing
three-dimensional 3D-animated images Unity was chosen [25].</p>
      <p>The control panel of the videographer is shown in fig. 4.</p>
      <p>The screen displays a photo of the silicon surface obtained using an electron microscope. The
virtual lab allows the student to work with this image as if the operator were working with the image
on a real installation. The contrast of the image can be changed by the student. The student has also
the opportunity to increase the selected area of the sample within certain limits. In the virtual
laboratory practice, many images of real sample surfaces were introduced. During the laboratory
work, the student must measure the dimensions of the pyramid on the surface of the sample of the
solar battery. This action is shown in fig. 4.</p>
      <p>A graphic scale can be overlayed on the photo of the sample. Having this scale, a photo and
knowing the angle of inclination of the specimen, it is possible to investigate the surface irregularities
with satisfactory accuracy. This operation is used in industry to control the quality of electronic
products, which determines the importance.</p>
      <p>An electron microscope is a complex setup that includes a fairly large number of multiple types of
equipment. And complex equipment always requires strict compliance with directions for operating.
Failure to follow the directions in most cases will cause the destruction of the equipment in physical
world. Therefore, the user of the software must strictly follow the instructions that will ensure
uninterrupted operation of the equipment and avoid damages when working with complex and
highvoltage devices. Safety precautions warn of dangerous factors for human life and health. Therefore,
the emphasis in the algorithm is made on anticipating the wrong steps of the student, warning about
the danger of performing or not performing certain actions with the equipment.</p>
    </sec>
    <sec id="sec-4">
      <title>4. The Algorithm of the development and verification of the Finite-State</title>
    </sec>
    <sec id="sec-5">
      <title>Machine in Laboratory Works</title>
      <p>The use of interactive algorithms with interdisciplinary teaching significantly improves the quality
of virtual works in natural sciences. This must first be taken into account when designing them to
expand the ways of virtual laboratory work at every step. The next important component is the
methods of evaluating the results, as well as the presence of self-control. During laboratory work
relating to the means of the experimental process, students must perform conscious choice
assignments. It is especially important to plan the interactive conditions of the experiment and the list
of virtual devices with the with the possibility of update software library. The model of the virtual
electronic laboratory using adaptive scenarios is presented in fig.5.</p>
      <p>Methods of visual intercommunication, methods of modeling and data acquisition have been also
realized for virtual laboratory development. Tasks are performed in real-time, with the illustration of
complex processes and interactive analysis of additional data.</p>
      <p>At any step of the process, the student can investigate the measurements from the current dataset.</p>
      <p>Each element of the virtual device can interchange data with other elements of the VLW and
external programs by the means of network technologies.</p>
      <p>To study the technical features of original laboratory devices with limited physical access, VLW
can also be a fine training tool.</p>
      <p>In the usual case, finite-state machines are processors that are represented in the form of
mathematical models of actually existing or possible discrete devices. The gathering of such
mathematical models and computational tasks that can be resolved using these models is the case of a
study of discrete mathematics, the theory of automatons. The implementation of the logic of
converting information by digital machines can be hardware, for example, by the means of integrated
circuits, as well as software, using programming languages or specific software, including CAD
software - Computer-Aided Design.</p>
      <p>In the course “Applied Theory of Finite-State Machines”, students are asked to construct a control
machine system based on the digital Moore finite-state machine that will complete some task of
hardware control. The algorithm for developing and checking the operability of the control automaton
is presented in fig.6.</p>
    </sec>
    <sec id="sec-6">
      <title>5. Conclusion</title>
      <p>VLW as a custom eLearning implementation and design solution for the virtual class are based on
real experimental setups. The developed software algorithm provides effective use of adaptive
scenarios in online courses of IT and natural sciences laboratories. Virtualization-based experiments
conducted in the virtual laboratory with a combination of STEM technology and computer graphics
improve the transparency and systematicity of complex processes and phenomena and the involve of
the author's computer models in the learning process.</p>
      <p>The integration process of Moodle with VLW and a variety of other programs with functional
together as a system is further very useful to meet various needs of a website for eLearning, including
developing courses using authoring tools and make it available through Moodle with the internal
course booking system.</p>
    </sec>
    <sec id="sec-7">
      <title>6. References</title>
    </sec>
  </body>
  <back>
    <ref-list>
      <ref id="ref1">
        <mixed-citation>
          [1]
          <string-name>
            <given-names>D. J.</given-names>
            <surname>Keegan</surname>
          </string-name>
          , “
          <article-title>On defining distance education</article-title>
          .”
          <string-name>
            <surname>Distance Education</surname>
            <given-names>ISSN</given-names>
          </string-name>
          :
          <fpage>0158</fpage>
          -
          <lpage>7919</lpage>
          ,
          <fpage>1475</fpage>
          -
          <lpage>0198</lpage>
          , Volume-
          <volume>1</volume>
          , Issue-1,
          <string-name>
            <surname>March</surname>
          </string-name>
          (
          <year>2006</year>
          ),
          <fpage>13</fpage>
          -
          <lpage>36</lpage>
          , DOI: 10.1080/0158791800010102
        </mixed-citation>
      </ref>
      <ref id="ref2">
        <mixed-citation>
          [2]
          <string-name>
            <given-names>D.</given-names>
            <surname>Keegan</surname>
          </string-name>
          , “
          <article-title>Concepts: Problems in defining the field of distance education</article-title>
          .”
          <source>American Journal of Distance Education ISSN: 0892-3647</source>
          ,
          <fpage>1538</fpage>
          -
          <lpage>9286</lpage>
          , Volume-
          <volume>2</volume>
          , Issue-2,
          <string-name>
            <surname>January</surname>
          </string-name>
          (
          <year>2009</year>
          ),
          <fpage>4</fpage>
          -
          <lpage>11</lpage>
          , DOI: 10.1080/08923648809526619
        </mixed-citation>
      </ref>
      <ref id="ref3">
        <mixed-citation>
          [3]
          <string-name>
            <given-names>D.</given-names>
            <surname>Sewart</surname>
          </string-name>
          ,
          <string-name>
            <given-names>D.</given-names>
            <surname>Keegan</surname>
          </string-name>
          ,
          <string-name>
            <given-names>B.</given-names>
            <surname>Holmberg</surname>
          </string-name>
          , “
          <article-title>Distance education: International perspectives</article-title>
          . ”
          <year>2020</year>
          . URL:https://books.google.com.ua/books?hl
          <article-title>=en&amp;lr=&amp;id=OujyDwAAQBAJ&amp;oi=fnd&amp;pg=PT7&amp; ots=Tl2D99Oz_J&amp;sig=PCh7apz6xYcx4INPJegCFm9eiZE&amp;redir_esc=y#v=onepage&amp;q&amp;f=false</article-title>
        </mixed-citation>
      </ref>
      <ref id="ref4">
        <mixed-citation>
          <article-title>[4] Jigsaw model for online education systems</article-title>
          ,
          <year>2020</year>
          . URL: https://jigsawinteractive.com/solutions/education/
        </mixed-citation>
      </ref>
      <ref id="ref5">
        <mixed-citation>
          [5]
          <string-name>
            <given-names>IMS</given-names>
            <surname>Global</surname>
          </string-name>
          ,
          <year>2020</year>
          . URL: www.imsproject.org
        </mixed-citation>
      </ref>
      <ref id="ref6">
        <mixed-citation>
          [6]
          <string-name>
            <given-names>LMS</given-names>
            <surname>Selection</surname>
          </string-name>
          <article-title>Guide 2020</article-title>
          . URL: https://mindflash.com/resource-center?postType=literature
        </mixed-citation>
      </ref>
      <ref id="ref7">
        <mixed-citation>
          [7]
          <string-name>
            <given-names>V.</given-names>
            <surname>Potkonjak</surname>
          </string-name>
          ,
          <string-name>
            <given-names>M.</given-names>
            <surname>Gardner</surname>
          </string-name>
          ,
          <string-name>
            <given-names>V.</given-names>
            <surname>Callaghan</surname>
          </string-name>
          ,
          <string-name>
            <given-names>P.</given-names>
            <surname>Mattila</surname>
          </string-name>
          ,
          <string-name>
            <given-names>C.</given-names>
            <surname>Guetl</surname>
          </string-name>
          ,
          <string-name>
            <given-names>V.M.</given-names>
            <surname>Petrović</surname>
          </string-name>
          and
          <string-name>
            <given-names>K.</given-names>
            <surname>Jovanović</surname>
          </string-name>
          ,:
          <article-title>“Virtual laboratories for education in science, technology, and engineering: A review</article-title>
          .
          <source>” Computers &amp; Education ISSN: 03601315</source>
          , Volume-
          <volume>95</volume>
          , (
          <year>2016</year>
          ),
          <fpage>309</fpage>
          -
          <lpage>327</lpage>
          , DOI: 10.1016/j.compedu.
          <year>2016</year>
          .
          <volume>02</volume>
          .002
        </mixed-citation>
      </ref>
    </ref-list>
  </back>
</article>