A RESEARCH OF AESTHETIC MOBILE LEARNING INTERFACES FOR PRIMARY EDUCATION - sersc
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International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 A RESEARCH OF AESTHETIC MOBILE LEARNING INTERFACES FOR PRIMARY EDUCATION Nor Fatin Farzana Zainuddin, Zuriana Abu Bakar, Noor Maizura Mohamad Noor Faculty of Ocean Engineering Technology and Informatics, Universiti Malaysia Terengganu, Terengganu, Malaysia. Abstract Aesthetics is an important element that able to influence people attraction. Aesthetics is a branch of philosophy that are dealing with the nature of art, beauty, and taste. Aesthetics also assign as the study of sensory or sensory-emotional values, sometimes called judgments of sentiment and taste. Meanwhile, aesthetics refers to how attractive the mobile are to the user going through it. As a result, visual appearance is important in deciding the aesthetic of mobile application interfaces. Hence, aims of this paper is to construct a model that can satisfy the aesthetic need of the mobile learning interface by the literature review. This study focuses on the mobile learning interfaces because the aesthetic of the interfaces could draw student’s attention to the content of the learning modules and inspire students explore more on the learning materials. The objectives of this research are to design mobile learning interfaces based on the aesthetic design principles selected, which are balance, simplicity, equilibrium, unity and consistency, to develop a model for measuring aesthetic mobile learning interfaces by the several key elements design. In order, to construct an aesthetic measuring model for mobile interfaces, this study will employ the key element design. The expected findings of this research is the model of an aesthetic mobile learning interface that could be use as the standard guidelines in mobile learning interface design. Keywords: Aesthetics, Interface Design, Mobile Learning I. INTRODUCTION Although aesthetics is a word that is not so popular among public, but it is the important elements that able to influence people’s attraction. The aesthetic in mobile interface design is extremely challenging. Due to the importance of aesthetic in mobile interface design success, this research aims to study aesthetic area in mobile learning. The fast technology growth of mobile learning interfaces design is a key factor driving researchers and designers incorporated the technology into key element of design mobile interfaces. The mobile learning interfaces for this study including main pages, learning pages and exercise pages that are designed according to the selected elements and principles design. The design principles considered in the current study are balance, equilibrium, symmetry, sequence, rhythm, order and complexity [1]. Thus, this paper will study aesthetics domain in designing mobile applications for education sectors to determine which interfaces are more aesthetic for mobile learning. The paper will discuss in the following sections. Section II will explain several of the key element of aesthetic mobile interface learning design that will be used in this research, secondly Section III will discuss the review framework of this paper. Afterwards, discusses of mobile interface learning design on the aesthetic in the context of education will explain in Section IV. Finally, the conclusion of this paper is present in Section V. II. RESEARCH BACKGROUND In order to have better understanding on a study that discussed in this paper, an explanation of aesthetics, interface design, and learning mobile are present as in the following subsections. A. Aesthetics Approaching the definition of the term aesthetics, this paper will use a definition, which is take as a point of reference for many researchers. International Standard ISO 9241-11 has defined aesthetics as the Aesthetics, a branch of philosophy that deals with the nature of beauty and taste, as well as the philosophy of art [2]. It examines subjective and sensory-emotional values, or sometimes called judgments of sentiment and taste [2].The aesthetics of the design must consider several key elements as follow [3]: ISSN: 2005-4238 IJAST 823 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 i. Learnability : How easily first time user complete basic task. ii. Efficiency : How quickly user perform basic task once they have learned the design. iii.Satisfaction : How pleasant the experience of using the design was. iv. Ease of use : How relevant and attract the user to used. v. Simplicity : How to minimize redundancy of searching. vi. Readability : How easily user to read. Due to increasing deployment of the mobile technologies, a number of researchers have focused on the aesthetics challenges of mobile learning interfaces [3]. Which are focus on a number of aesthetic interfaces area that related to the mobile learning such as mobile context, connectivity, small screen size, different display resolution, limited processing capability and power and data entry methods for mobile users. All of this limitation will give impact on the usability of mobile application thus will further be discuss in this paper. B. Interface Design Interaction design is relate with interface design as both are correlated together to ensure that there is interaction between user and the interface and it is a part of system development process [4]. An important area for designing interface of applications is the design for user to access the digital information. Besides that, it is important to provide connection between the user and the application because application is in digital environment, this process allows user to perform task and increase the involvement of users in the application. Besides that, interaction design is one of the subject in Human Computer Interaction (HCI) because HCI studies the human interaction with any product or technology [5]. Therefore, interaction design also a phase that use user’s experience in designing the interface design of the product. Hence, it is a process where they need to define whether that product is easy to learn or use and avoid ambiguous features. The design that involves in interaction design such as quality experience, cognition, ergonomics, perception, and semantic need to integrate in design process. Some of the operations that involves need usability testing to ensure that it can support user interaction [6][7][8]. Interaction design is an important phase in the system development as it provides significant interaction between user and the product based on user experience. C. Mobile Learning (m-learning) M-Learning systems and environments are design in taking into account a set of technological and pedagogical aspects [9], and should be design considering HCI and usability concepts and methodologies. HCI offers a core of concepts and methodologies that constitute a step ahead in the design of interactive systems [10]. M-Learning is based on computers, devices and screens and is fundamentally interactive and, for this reason, User interface design (UID) is a key element in the design of interactive m-learning systems that take into account user needs and characteristics. Sub criteria becomes a key factor in the user’s ability to acquire knowledge in a satisfactory manner. Thus, m-learning really need user interface design criteria and their sub criteria to design an interface. III. REVIEW FRAMEWORK This study focuses on topic regarding aesthetic area in mobile applications development specifically for primary education. Therefore, the academic journals and papers in various databases such as Google Scholar, IEEE Explorer had been referred for this research. The academic journals and papers used in this study are according to the published paper within 2004 to 2017. Fig. 1 shows the review method that has been used in this paper: Fig. 1. Research Review Framework ISSN: 2005-4238 IJAST 824 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 IV. DOMAIN AESTHETICS DESIGN INTERFACE FOR MOBILE IN LEARNING A. Education The wide used of technology have cause higher education institution to incorporated technology in their learning curricula. Most convenient tools adopted learning environment is mobile phone [11] because it brings out a new way of learning in order to gain ideal learning advantages [12]. M-learning decorate more flexible environment for computer-based assessment compare with traditional assessment that using paper and pencil. Due to the high number of mobile applications and diversity of user, hence it is important to test the aesthetic of the applications. This can ensure that the applications are able to boost learner’s learning outcomes when participates in learning activities. Besides that, any application should have a good interaction design to support interaction between user and the applications. Thus, aesthetic testing can ensure that the interaction design and interface design are well perform in order to support the application. Based on Rabail Tahir and Fahim Arif, 2014 [13] studies, they found out that the most important element in UID of m-learning is efficiency, navigation, engagement, readability and cognitive load for limited split attention. M-learning must ensure that the interface designs are the causes for the user attention engage in. While NGO, D. C. L., & Byrne, J. G. (2001) [14] studies concerned in balance, simplicity, equilibrium, user friendly and consistency. The features provided in the application must be consistent to avoid user from getting confused and visibility of the features must be present clearly. According Thompson, Braddy, & Wuensch, (2008) [15]stated that there are three aesthetic factor involves which is graphical design, navigation and organization. This finding almost similar with [16] studies, as both points out flexibility and minimal action are important in m-learning aesthetic testing. In m-learning UID, it is important to make sure that the user interface or content are adaptable to the learner [17] studies on the aesthetic for E-Book and APP (mobile application) in learning environment found that the most Graphical Design element that received the highest score is aesthetics followed by intention of use, convenience, user satisfaction and task-technology fit. Similar studies also done by Jou, M., Tennyson, R. D., Wang, J., & Huang, S. Y. (2016). [18] on determining aesthetic of mobile E-Book application. They had identified the main elements involves in determining the aesthetic of E-Book application and categorize it into four principles which is visibility, ease, efficiency and enjoyment. The categorization of the principle is made through heuristic evaluation of several author on interface principles and applied into their research. They also found out that visibility principle is relate with user’s personal perception while others principles is related to user’s previous experience. The interface attributes that provides important impact to the user area of unit aesthetics, action and friendliness of the m-learning application. Table 1- 4 in section V, shows the detail for each element including interface attributes. Overall, in m-learning application, the main factor should be consider during aesthetic testing are flexibility, consistency, aesthetics, visibility, affordance, minimal action, user friendly, intention of use, ease-of-use, convenience, learnability, user satisfaction and task - technology fit. This can ensure user perceived aesthetic of the applications and it purpose. B. Design interface for mobile learning This study applies seven design principles for designing mobile interface learning, which are balance, equilibrium, simplicity, unity, density, proportion and economy study. Figure 2 until Figure 8 shows seven mobile interfaces for each design principle applied in this study. The balance can be define as the distribution of the weight in a picture [19]. It also achieve an equal weight of screen element, which are left, right, top and bottom. Equilibrium was computed as the difference between center of mass of displayed elements and physical center of the screen [19]. Besides that, the equilibrium is stabilization or midway centre of element through centering the layout itself. Others, simplicity is a singleness form and a combination of the elements. The simplicity in screen design is achieved by optimizing the number of elements on a screen and minimizing the alignment points [20][21][22]. The unity reacts coherence, a totality of elements that constitute visually one piece. With unity, the elements seem to dovetail so completely that they are seen as one thing. Unity in screen design is achieved by using similar sizes and leaving less space between elements of a screen than at the margins [23] the density is the extent to which the screen is covered with objects. Density is achieved by restricting screen density levels to an optimal percentage ISSN: 2005-4238 IJAST 825 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 [19]. A measure of density, derived by Tullis, is the percentage of character positions on the entire frame containing data.[22][24]. What constitutes beauty in one culture is not necessarily considered the same by another culture, but some proportional shapes have passed the test of time and are found in abundance today. The economy stands for careful and discreet use of display elements to get the message across in the simplest possible way. It is achieved by using as few sizes as possible [24]. Fig. 2. shows the application of design principle balance by using four (4) boxes and text. Fig. 2. Mobile Interface Design using Balance Design Principle Fig. 3. shows the application of design principle equilibrium by balancing the left and right that center their layout itself. Fig. 3. Mobile Interface Design using Equilibrium Design Principle Fig. 4. shows the application of design principle simplicity by applying minimum number of element in interfaces. Fig. 4. Mobile Interface Design using Simplicity Design Principle ISSN: 2005-4238 IJAST 826 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 Fig. 5. shows the application of design principle unity by displaying the element in one page. Fig. 5. Mobile Interface Design using Unity Design Principle Fig. 6. shows the application of design principle density by optimum the space of design. Fig. 6. Mobile Interface Design using Density Design Principle Fig. 7. shows the application of design principle proportion that relates to the difference scale of object. Fig. 7. Mobile Interface Design using Proportion Design Principle Fig. 8. shows the application of design principle economy study by displaying elements to get the message across in the simplest possible way. ISSN: 2005-4238 IJAST 827 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 Fig. 8. Mobile Interface Design using Economy Study Design Principle V. FINDINGS AND DISCUSSION Based on the literature reviews, aesthetic area are shown in Table 1, Table 2 and Table 3. There are many area emphasized by different authors, which is from design element and design principle. Even though the issues are various, similar terms such as navigation, graphical design, simplicity, and organization that brings the same meaning for design interface. Table- I: Literature in the field of aesthetic judgement based on design elements/principles Author(s)/Year Elements Jiang, Wang, Measured five (5) design elements Tan, Yu (2016) - unity, complexity, intensity, novelty, interactivity Lazard et al., Measured four (4) design (2016) principles - simplicity, diversity, colorfulness, craftsmanship Reinecke et al., Measured two (2) design (2013) principles - colorfulness and visual complexity Reinecke, Measured ten (10) design Bernstein (2011) principles - information density, navigation, accessibility of functions, guidance, structure, colorfulness, saturation, image-to-text ratio, support, help-text Zain, Tey, Goh Measured six (6) design elements (2008) drawn from Ngo et. al. (2000) - balance, equilibrium, symmetry, simplicity, sequence, rhythm, order, complexity Moustakis, Measured five (5) design Litos, Daviligas, principles - content, navigation, Tsironis (2004) design and structure, appearance and multimedia, uniqueness From Table 1, it can be seen that, the most aesthetic element for aesthetic design based on elements/principles are complexity, simplicity and colorfulness. ISSN: 2005-4238 IJAST 828 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 Table- 2: Literature review of element/principle based on mobile design interface Author (s) / Element Year Maziar,Chui Yin UID principle Wong (2012) 6 factors - consistency, flexibility, learnability, minimal action, minimal memory load, and user guidance Khan UID elements. Mobile design Kalimullah* , guidelines, UU principles, mobile Donthula health guidelines, inclusive design Sushmitha guidelines1 (2017) Rabail Tahir and UI Design criteria (User Interface) Fahim Arif - Input, Cognitive Load, (2014) Customization / Personalize, Screen Design, Layout, Learning potential, Feedback, User Control, Navigation/Orientation, Help/support, Error, Interactivity, Time required, Engagement, Readability. Mi, Na Specifically, a set of preliminary Cavuoto, Lora user requirements (59 items) was A. extracted from existing standards, Benson, guidelines, and user requirements Kenneth regarding mobile handheld device Smith-Jackson, accessibility. The initial set of 59 Tonya user requirements was Nussbaum, re-organized into 44 statements in Maury A. (2014) six general categories: mechanical controls, display, speech and general operation controls, audio feedback controls, touch-operated controls, and others. Punchoojit UI design patterns LHongwarittorr Customization/Personalize, n N (2017) Screen Design, Layout, Learning potential, Feedback, User Control, Navigation/Orientation, Help/support, Error, Interactivity, Time required, Engagement, Readability. Table 2 shows that the most aesthetic review for mobile design interfaces based on UID are learnability, readability and navigation. ISSN: 2005-4238 IJAST 829 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 Table- 3: Literature review based on website interface Authors Yea Organizatio Content Navigatio Graphical Purpos Simplicit r n Utility n Representation e y Belanche, 2012 1 1 1 1 1 Casaló, & Guinalíu Lee & 2012 1 1 Kozar Cyr, Head, 2010 1 & Larios Djamasbi, 2010 1 1 Siegel, & Tullis Dastidar 2009 1 1 1 1 Thompson, 2008 1 1 1 1 Braddy, & Wuensch Tarafdar & 2008 1 1 1 Zhang Braddy, 2008 1 Meade, & Kroustalis Djonov 2007 1 1 1 Maurer & 2007 1 1 1 Liu Tan & Wei 2007 1 1 1 1 1 TOTAL 6 3 8 7 6 3 % 54.55 27.27 72.73 63.64 54.55 27.27 Ranking 3 4 1 2 3 4 From Table 3, the most aesthetic review for website design which are navigation, graphical representation, and purpose. As a result, for overall literature review, the important of interface mobile design based on UI Design Criteria are Navigation, Graphical Design, and Readability such as the Table- 4: Main criteria and sub criteria on mobile interface UI Design Sub criteria Guidelines Criteria Cognitive Content Use appropriate Load /concept language Use appropriate content Efficiency Aesthetic Simple, attractive (Graphical Colors and organized Design) Font design style/Size Use bright colors for Menu children Buttons Use appropriate font Icons style and size Provide proper menu for touch screen Provide colorful and animated buttons Icons must be relevant to information they ISSN: 2005-4238 IJAST 830 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 present Learning Ease to learn Ease of learning Potential Education Appropriate value educational content Suitability Suitability for all users and learner control. Engagement Motivation Endeavor to learn engagement Provide interesting rewards. Readability Ease of readability Provide appropriate text size, spacing etc. Navigation/ Ease to Ease of orientation Orientation navigate Ease of navigation (Learnabilit Clear and consistent y) navigation Navigation Provide clear keys navigation buttons. Main menu/ Provide main menu start screen for navigation Clear main menu/start page link Hierarchal Hierarchal menu for menus easy navigation Scrolling Scrolling may be difficult for children Allow scroll and view, when a lot of information is present. V. CONCLUSION This study aims to present an element or principle of aesthetic that are balance, simplicity, proportion, density, equilibrium, unity, economy study and consistency of mobile application interfaces design, hence that other researchers and practitioners can take into consideration in designing mobile interfaces application in education sectors. On the other hand, this study will provided practitioners to determine which more aesthetic domain should be take into account when they want to do a testing and measuring the aesthetic level for mobile applications. Besides that, to attract student by mobile learning also popular nowadays. Mobile devices such as tablets are now children's posh interactive toys and it is a favorable toy for the parents to acquire for their children Osman, Talib, Sanusi, Tan, & Alwi, (2012) as propose by Alsubaie, M. Alaithan, M. Boubaid and N. Zaman (2018) in their paper [25]. The design principle review by this paper can contribute to the game mobile learning interfaces. ISSN: 2005-4238 IJAST 831 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 VI. FUTURE WORK For future work, aesthetic design are recommend to other researchers that can explore more about aesthetic issue in others sectors. From there, aesthetic issues from different angle and perspective could be identified. Other than that, based on this research other designer can implement the selected design principle for primary education m-learning interfaces. ACKNOWLEDGMENT This paper is support by a grant from the Fundamental Research Grant Scheme (FRGS), and the Ministry of Higher Education (MOHE) vot number 59542. REFERENCES 1. D. C. L. NGO and J. G. Byrne, “Another look at a model for evaluating interface aesthetics,” Int. J. Appl. Math. Comput. Sci., vol. 11, no. 2, pp. 515–535, 2001. 2. K.-C. Hou and C.-H. Ho, “a Preliminary Study on Aesthetic of Apps,” pp. 1–12, 2012.. 3. K. Kalimullah and D. Sushmitha, “Influence of Design Elements in Mobile Applications on User Experience of Elderly People,” Procedia Comput. Sci., vol. 113, pp. 352–359, 2017. 4. L. Brady and C. Phillips, “Aesthetics and usability: A look at color and balance,” Usability News, vol. 5, no. 1, pp. 2–5, 2003. 5. R. Harrison, D. Flood, and D. Duce, “Usability of mobile applications: literature review and rationale for a new usability model,” J. Interact. Sci., 2013. 6. S. R. Klemmer, B. Hartmann, and L. Takayama, “How bodies matter: Five themes for interaction design,” in Proceedings of the Conference on Designing Interactive Systems: Processes, Practices, Methods, and Techniques, DIS, 2006. 7. L. Alben, “Defining the criteria for effective interaction design,” in Interactions, 1996. 8. A. Henderson, “Interaction design: beyond human-computer interaction,” Ubiquity, 2002. 9. J. Zimmerman, J. Forlizzi, and S. Evenson, “Research through design as a method for interaction design research in HCI,” in Conference on Human Factors in Computing Systems - Proceedings, 2007. 10. C. Lallemand, G. Gronier, and V. Koenig, “User experience: A concept without consensus? Exploring practitioners’ perspectives through an international survey,” Comput. Human Behav., 2015. 11. 37–41. http://doi.org/10.1037/a0022390 Tuma, J. M., & Pratt, J. M. (1982). Clinical child psychology practice and training: A survey. \ldots of Clinical Child & Adolescent Psychology, 137(August 2012) et al., “Innovations in Education and Teaching International Rethinking PhD learning incorporating communities of practice Rethinking PhD learning incorporating communities of practice,” Innov. Educ. Teach. Int., 2009. 12. S. Kujala, V. Roto, K. Väänänen-Vainio-Mattila, E. Karapanos, and A. Sinnelä, “UX Curve: A method for evaluating long-term user experience,” Interact. Comput., 2011. 13. R. Tahir, “A MEASUREMENT MODEL BASED ON USABILITY METRICS FOR MOBILE LEARNING USER INTERFACE FOR CHILDREN,” Int. J. E-Learning Educ. Technol. Digit. Media, 2015. 14. D. C. L. Ngo, “Measuring the aesthetic elements of screen designs,” Displays, 2001. 15. L. F. Thompson, P. W. Braddy, and K. L. Wuensch, “E-recruitment and the benefits of organizational web appeal,” Comput. Human Behav., 2008. 16. H. R. Abachi and G. Muhammad, “The impact of m-learning technology on students and educators,” Comput. Human Behav., 2014. 17. D. F. O. De Paula, B. H. X. M. Menezes, and C. C. Araújo, “Building a quality mobile application: A user-centered study focusing on design thinking, user experience and usability,” in Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2014. 18. M. Jou, R. D. Tennyson, J. Wang, and S. Y. Huang, “A study on the usability of E-books and APP in engineering courses: A case study on mechanical drawing,” Comput. Educ., 2016. 19. J. M. Zain, M. Tey, and G. Y. Soon, “Using Aesthetic Measurement Application (AMA) to measure aesthetics of web page interfaces,” in Proceedings - 4th International Conference on Natural Computation, ICNC 2008, 2008. 20. W. O. Galitz, “The essential guide to user interface design,” SIGCHI Bull., 1997. 21. A. Blair-Early and M. Zender, “User interface design principles for interaction design,” Design Issues. 2008. ISSN: 2005-4238 IJAST 832 Copyright ⓒ 2020 SERSC
International Journal of Advanced Science and Technology Vol. 29, No. 6s, (2020), pp. 823-833 22. M. Taylor and P. Rodgers, “Applying graphical design techniques to graph visualisation,” in Proceedings of the International Conference on Information Visualisation, 2005. 23. Z. (Jack) Jiang, W. Wang, B. C. Y. Tan, and J. Yu, “The Determinants and Impacts of Aesthetics in Users’ First Interaction with Websites,” J. Manag. Inf. Syst., 2016. 24. D. C. L. Ngo, L. S. Teo, and J. G. Byrne, “Evaluating Interface Esthetics,” Knowl. Inf. Syst., 2002. 25. A. Alsubaie, M. Alaithan, M. Boubaid, and N. Zaman, “Making learning fun: Educational concepts & logics through game,” in International Conference on Advanced Communication Technology, ICACT, 2018. 26. (Ismail, Ahmad, Kamaruddin, & Ibrahim, 2016)Brady, L., & Phillips, C. (2003). Aesthetics and usability: A look at color and balance. Usability News, 5(1), 2–5. 27. Harrison, R., Flood, D., & Duce, D. (2013). Usability of Mobile Applications: Literature Review and Rationale for A New Usability Model. 28. Klemmer, S. R., Hartmann, B., & Takayama, L. (2006). How bodies matter: five themes for interaction design. Proceedings of the 6th Conference on Designing Interactive Systems, (ACM). 29. J. G. B. David Chek Ling Ngo Lian Seng Teo, “A Mathematical Theory of Interface Aesthetics,” Vis. Math., 2000. 30. C. Salimun, H. C. Purchase, D. R. Simmons, and S. Brewster, “Preference ranking of screen layout principles,” in Proceedings of the 24th BCS Interaction Specialist Group Conference, 2010, pp. 81–87. 31. Wang, C.-M., & Huang, C.-H. (2015). A study of usability principles and interface design for mobile e-books. Ergonomics,(May),1– 13. 32. D. C. L. Ngo, L. S. Teo, and J. G. Byrne, “Modelling interface aesthetics,” Inf. Sci. (Ny)., vol. 152, no. SUPPL, pp. 25–46, Jun. 2003. 33. R. Parizotto-Ribeiro and D. N. Hammond, “What is Aesthetics anyway ? Investigating the use of the design principles,” Aesthetic Approaches to Human-Computer Interact. Proc. Nord. 2004 Work., pp. 37–40, 2004. ISSN: 2005-4238 IJAST 833 Copyright ⓒ 2020 SERSC
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