Chotikakamthorn, Nopporn

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Chotikakamthorn, Nopporn
Alternative Name
Chotikakamthorn, N.
Chotikakamthornb, Nopporn
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Email
nopporn.ch@kmitl.ac.th

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    Item type:Publication,
    Using tangible user interfaces in computer-based training systems for low-functioning autistic children
    (2012-02-01)
    Sitdhisanguan, Karanya
    ;
    Chotikakamthorn, Nopporn
    ;
    Dechaboon, Ajchara
    ;
    Out, Patcharaporn
    In this paper, the design of a computer-based training (CBT) system for low-functioning autistic children is addressed. The emphasis is on ease-of-use and learning efficiency of CBT systems with different interaction styles, namely the WIMP (Window Icon Menu Pointing Device) and TUI (Tangible User Interface) interaction styles. Two WIMP-based CBT systems with different pointing devices were involved in the study. The first system applied a standard computer mouse as a pointing device, while the second one employed a touch screen instead. For the TUI-based CBT system, a tabletop setting was adopted. Based on the known characteristics of TUI and children with autism, as well as related cognitive and learning theories, the benefits of TUI for low-functioning autistic children have been investigated. Elementary skill teaching was chosen as a case study for performance evaluation of these CBT systems. Empirical results show that the touch-based and TUI-based systems offered much better ease-of-use performance than that of the mouse-based system. Regarding learning efficacy, experimental results show that the TUI-based system achieved higher skill improvement, as compared with the WIMP-based system and a non-computer training method. Some guidelines and suggestions for the design of a TUI-based system for children with autism are summarized. © 2011 Springer-Verlag London Limited.
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    Electronic document data hiding technique using inter-character space
    (1998-12-01)
    Chotikakamthorn, Nopporn
    In this paper, the problem of hiding data in electronic document for adding captions or fingerprints is considered. A new data hiding scheme, which utilizes difference in character-to-character space for data embedding, is presented. Coding and enhancing techniques are proposed as a means to alleviate effects of noise and distortions, possibly arise during document copying or scanning process. Experimental results using documents written in Thai and English are provided to demonstrate its practical applicability. The method's weakness and future work are also discussed.
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    Query decomposition method for multi-keyword search in P2P systems
    (2015-01-01)
    Chotikakamthorn, N.
    ;
    Jitnupong, T.
    A problem of multi-keyword search in a structured peer-to-peer (P2P) distributed computing system is considered. Methods have been developed to employ term-set indexing in a P2P system. Such an approach is an attempt to avoid excessive communication cost incurred by intersection operations in a single-term indexing method. In addition to limiting the maximum term-set size, index pruning was proposed to avoid exponential growth of the term-set index size. However, to obtain a global search result, query decomposition and query result intersection operations are still needed when the number of query terms exceeds the maximum term-set size. With index pruning employed, how a multiterm query is decomposed and affects the quality of retrieval results in terms of recall and precision is shown. A near-optimal query decomposition method is proposed to alleviate such a problem. Results from the simulation demonstrate the improvement gained by the proposed method.
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    Assessing the Effectiveness of Smartphone Usage to Interact with Learning Materials in Independent Learning Outside of Classrooms among Undergraduate Students
    (2021-03-01)
    Vongjaturapat, Sununthar
    ;
    Chotikakamthornb, Nopporn
    ;
    Yimyamc, Panitnat
    Clearly, the smartphone is increasingly playing a greater role in everyday life, thus providing opportunities to evaluate how well the use of the smartphone meets the requirements of undergraduate students in independent learning outside of a classroom setting. This study used the task-technology fit (TTF) model to explore the effectiveness of smartphone usage to interact with learning materials in independent learning outside of classrooms, the need for smartphone support, and the fit of devices to tasks as well as performance. First, the study used interviews, observation, and survey data to identify what are the most important constructs of smartphones that stimulate students to interact with learning materials in independent learning outside of classrooms. Based on the findings from the exploratory study and Task Technology Fit theory, we postulated the Navigation design, Ergonomic design, Content support, and Capacity as the essential dimension of the smartphone construct. Then, we proposed a research model and empirically tested hypotheses with the structural model analysis. The results reveal a significant positive impact of task and technology on TTF for smartphone usage to interact with learning materials in independent learning outside of classrooms; it also confirmed the TTF and performance have a direct effect on actual use.
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    On-Chain Verifiable Credential with Applications in Education
    (2024-07-01)
    Chotikakamthorn, Nopporn
    ;
    Mi San, Aye
    ;
    Sathitwiriyawong, Chanboon
    A verifiable credential (VC) has been standardized and applied in vari-ous domains, including education. Due to its immutability, blockchain has been considered and used for credential issuance and verification. Most existing methods, however, are not compatible with the W3C VC stan-dard. In this paper, an on-chain VC issuance and verification method has been described. The method is based on the standard VC data model and applicable to any credential type. It decomposes a VC document into a VC template and the corresponding value array(s). This allows a VC to be issued on-chain in the Bitcoin BTC network, which has a limited data-embedding capacity. The proposed method reduces blockchain resource consumption due to the reusability of a VC template. In addition, it allows the use of a concise VC fingerprint format instead of a full VC for credential exchange. Two issuance modes, namely the full on-chain and partial on-chain, are proposed targeting different use cases. The proposed method has been applied for issuing and verifying two learning credential types. The method was evaluated on the Bitcoin Testnet to measure time and space complexities. With the reduced-size VC fingerprint, the proposed method can embed a VC on a traditional paper-based credential as a compact-sized QR code. The proposed method ofiered faster VC issuance and verification than an existing standard-based verifiable credential method.
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    Alternative formulation of Bayesian-based digital matting technique
    (2006-10-09)
    Chotikakamthorn, N.
    An alternative formulation to the original Bayesian-based digital matting technique is described. With the new formulation, a user does not need to choose an image-dependent noise variance parameter, as in the original method. An iterative algorithm that avoids exhaustive search is provided. Performance comparison with the original method is given. © The Institution of Engineering and Technology 2006.
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    A COMPARATIVE STUDY OF FOREARM AND HAND MUSCLE USAGE DURING HANDWRITING PRACTICE USING HANDWRITING TOOL
    (2022-01-01)
    Vongjaturapat, Sununthar
    ;
    Chotikakamthorn, Nopporn
    The foundation of education is learning how to write and is considered an essential skill. The early years of education are dedicated to learning how to hold a pencil and how to form letters and words. This research aims to investigate whether there are differences in muscle activity usage between various digital handwriting tools and a standard pencil. We compare the electromyogram of five muscles: upper trapezius (TRAP), biceps brachii (BB), extensor digitorum communis (EDC), flexor digitorum superficialis (FDS), and first dorsal interosseous (FDI) during elementary school’s practice of forming letters and words. Five types of (digital) handwriting devices were used. The results showed that using Chromebooks, indicating a trend of increasing in TRAP and BB muscle activities. However, using Chromebook, indicating a trend of reducing in FDI muscle activity. Moreover, when practicing forming letters and words with iPad Pro and Livescribe pens, subjects had the lowest TRAP and BB muscle activity. When using a pencil, it indicated a trend of increasing EDC, FDS and FDI muscle activities. The findings also suggest that a Boogie Board Sync, without line space on the black screen of slate, may create difficulty in controlling their strokes on the surface properly, strokes beautification and their aesthetics, and these may ultimately affect muscle activity. Thus, this study indicated a potential lower energy consumption and lower health risks with the digital handwriting technology. Therefore, for preventing long-term negative effects on fine motor skills development digital handwriting tools may be a suitable interface solution for learning environments
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    Item Response Time Analysis Using Ex-Gaussian Distribution for Disengagement Detection in Online Low-Stakes Tests
    (2026-01-01)
    Chotikakamthorn, N.
    This study addresses the problem of detecting disengagement in online low-stakes tests used in blended learning within higher education. The detection method was developed based on an analysis of item responses and associated response times. The method applied the ex-Gaussian mixture model to response times, rather than the conventional lognormal model. The mixture component with the smallest Gaussian mean was chosen to represent the response times distribution of early correct responses. The selected mixture component was used to obtain the model’s mode, which then served as the threshold for classifying item responses into early and subsequent response groups. Based on the two classified groups, descriptive statistics and graphical visualizations were introduced to support manual inspection and provide insight into item- and person-level characteristics. A test statistic for disengagement detection was formulated based on the distribution of the number of early responses. Drawing on prior knowledge of the success probabilities associated with disengaged responses, two detection boundaries were defined to classify item-preknowledge and rapid-guessing behaviors. Unlike existing model-based methods for rapid guessing and item preknowledge behavior detections, the proposed non-parametric method does not require prior knowledge of item or person parameters, nor does it involve modeling or estimating such characteristics. The method’s performance was assessed using both real and simulated data, and results for true positive rates and false positive rates were reported under various test conditions. The findings indicate that the method’s performance improves with an increasing number of test items and a higher proportion of disengaged responses. Simulation results further demonstrated the method’s robustness to measurement error and small variations in response times, in contrast to the person-level adaptation of the NT10 and CUMP methods, whose performance varied significantly under the same conditions.
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    Analysis of Factor Influencing the Tablet Acceptance for Library Information Services: A Combination of UTAUT and TTF Model
    (2015-09-02)
    Vongjaturapat, Sununthar
    ;
    Chaveesuk, Singha
    ;
    Chotikakamthorn, Nopporn
    ;
    Tongkhambanchong, Sakesan
    Increasingly, powerful mobile technology, like the tablet, empowers learners to seek information in mobile learning scenarios virtually anywhere and anytime. It is important for the academic library to look at how students use their tablets for library information seeking tasks to fully understand the nature of the patron's task and the need for the tablet. This study investigates the function of mobile technology based on the information seeking task, with particular reference to the appropriateness of tablet characteristics for the information seeking task in a library online database, downloading and reading from the screen, the effect of the patron's perception on their behavioural intention (BI) to use the tablet, and a measure of the patron's acceptance. Adapting the unified theory of acceptance and use of technology (UTAUT) model requires re-specification to suit a specific information system. The re-specific model introduces new constructs and new measuring instruments. New constructs were used for exogenous predictors of the UTAUT variables as well as including integration variables namely technology characteristics and task characteristics that were explicitly contained in the task-technology fit (TTF) model. These extensions and integrations of UTAUT have been valuable in expanding our understanding of technology adoption and extending the boundaries of the theory. Our research found that TTF and performance expectancy (PE) have a direct effect on actual use (AU). In addition, we also found a significant effect of the TTF on PE which in turn influences BI to accept the tablet for library information seeking tasks. This shows the importance of TTF. Besides, the results showed that interaction with library search systems revealed the strongest effect among the exogenous variables, which ultimately determines the AU of the tablet for library information seeking tasks.