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On-Chain Verifiable Credential with Applications in Education
(2024-07-01)
Chotikakamthorn, Nopporn
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Mi San, Aye
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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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Using Mozilla Hubs for Online Teaching: A Case Study of An Innovation Design Method Course
(2023-01-01)
Poolsawas, Banyapon
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Chotikakamthorn, Nopporn
During the Covid-19 pandemic, video conferencing platforms such as Zoom Online, MS Team Meeting, and Google Meets have been primary remote teaching tools. 3D immersive and non-immersive social platforms such as Mozilla Hubs have been studied as alternative tools for organizing remote teaching. This study aimed to assess the usability of Mozilla Hubs when applied to remote teaching and compared it to that of the widely used Zoom platform. An undergraduate course on innovation design methods was selected as the case study. Students enrolled in this course were divided into two groups. Distance learning was conducted through the Zoom platform for the first group of students. In contrast, the other group participated in the course activities through the Mozilla Hub platform within a non-immersive setting. The students in the Hubs group were requested to participate in the Hub pre-training class a week before the first week of the course's lecture. Six everyday tasks requiring student interaction with each of the two platforms were selected for the study. Usability was measured in terms of efficiency and ease of use. The time taken to complete each of the selected tasks was used to measure the efficiency of each platform. The System Usability Scale (SUS) questionnaire was used to measure ease of use. For most tasks, both platforms yielded comparable results regarding task efficiency. The only exception is for the room transition task, where the results differed between the two platforms depending on whether the teleport or 3D navigation methods were chosen by students in the Hubs group in order to complete the task. Discussion on the factors affecting the efficiency of the room transition task was provided. Using the SUS questionnaire, it was found that both platforms yielded comparable SUS scores of 68.91 and 70.66 for the Zoom and Mozilla Hubs platforms, respectively. Similar ease-of-use results were due to the offering of the Hubs pre-training class to the students using the Mozilla Hubs platform.
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A COMPARATIVE STUDY OF FOREARM AND HAND MUSCLE USAGE DURING HANDWRITING PRACTICE USING HANDWRITING TOOL
(2022-01-01)
Vongjaturapat, Sununthar
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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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Blockchain-based Learning Credential Revision and Revocation Method
(2020-10-07)
San, Aye Mi
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Chotikakamthorn, Nopporn
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Sathitwiriyawong, Chanboon
Many blockchain-based learning credential systems have been proposed to reduce fraud and improve verification efficiency. In addition to a method for issuing and verifying credentials, a solution is needed to support the revision and revocation of an issued credential record. For the case of learning credentials, depending on how a revocation policy affects credential use that occurred before the revocation date, an additional mechanism may be needed for credential revision. Current digital learning credential methods offer only a revocation mechanism. So they do not fully meet such unique requirement in the education context. In this paper, a blockchain-based method for learning credential revision and revocation is proposed. It makes use of the revision and revocation addresses assigned to each batch of issuing credentials. To revise (revoke) one or more credentials, the proposed method stores the revision (revocation) list as a message in the OP_RETURN field of the revision (revocation) transaction, with the revision (revocation) address as one of its outputs. The concept of a local credential id has been introduced to allow a revision (revocation) list to be efficiently stored on a blockchain system. It is based entirely on a blockchain system and does not require any centralized authority. It is also applicable to most blockchain systems. A comparative study of the proposed method against existing credential revocation methods is also provided.
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Blockchain-based Learning Credential Verification System with Recipient Privacy Control
(2019-12-01)
San, Aye Mi
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Chotikakamthorn, Nopporn
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Sathitwiriyawong, Chanboon
Various forms of learning credentials play an important role in society. For example, a degree certificate is usually required to apply for many jobs. Currently, paper-based learning credentials such as diploma or degree certificates are still widely used. However, proof of such credentials' authenticity has become increasingly more difficult in recently years due to availability of low-cost desktop publishing tools. Recently, a blockchain-based digital certificate issuing and verification system has been proposed to address these problems. However, existing blockchain-based certification verification solutions have a few shortcomings in common. One of them is the lack of mechanism to control the amount of information and anonymity exposed during the verification process. This paper proposed a blockchain-based learning credential verification system, where a} {credential recipient can control the amount of credential-related information to be exposed during the verification process. The proposed solution makes use of a Merkle tree to encode causal relationship among pieces of information the credential is composed of. The abstract data model built on top of the binary Merkle tree has been proposed so that a recipient can choose to disclose part of the credential information, including the recipient profile. This means it is possible for credential verification to be performed anonymously. This can be achieved without increasing blockchain transaction cost and complexity. Example of use case scenarios that require such anonymous verification are described.
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Evaluation of mobile phone interaction with large public displays
(2017-09-05)
Pattanakimhun, Patchara
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Chinthammit, Winyu
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Chotikakamthorn, Nopporn
Large public displays are widely used in public spaces for serving information. The flow of the information is largely a one-way passive communication due to a lack of user-content interaction, which in some ways limits its effectiveness as an information display system. We propose a use of mobile phones as a tool to interact with a public display. Our proposed mobile-public display user interaction uses a mobile phone to control and retrieve information from a public display. In this paper we present results of a usability test of our proposed interaction, which indicated that there was a strong correlation between the information retrieval performances and the participant's level of engagement with the mobile phone.
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Interactive public display using mobile web client
(2017-07-01)
Pattanakimhun, Patchara
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Chotikakamthorn, Nopporn
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Chinthammit, Winyu
Large public displays are widely used in public spaces for serving information. Most of them lack user-content interaction due partly to the fact that a touch screen is not suitable. With nearly universal adoption of mobile smartphone devices worldwide, its use as a tool for interacting with a public display is a viable option. Lack of standard interaction methods, protocols, and wide-spread used mobile applications for this purpose is a problem that prevents its adoption. In this paper, we address these problems by proposing a method with a mobile phone device as a tool for interaction with a public display system. The method is based on a standard web client, preinstalled on all smartphone devices, thus avoiding the problem as mentioned. Standard mobile gestures were employed for ease of use. The problem of establishing a connection and getting control of the public display is addressed. Three pairing methods have been described and evaluated. The results and discussion are provided.
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Handwriting rearrangement for Thai calligraphy
(2017-02-23)
Tonmaithong, Karun
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Annanab, Supawan
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Chotikakamthorn, Nopporn
In this paper we propose a new algorithm to rearrange handwriting for Thai online handwriting beautification. First, we segment the line into the right group (Line of tone level, Line of upper level, Line of body level and Line of lower level). Then we calculate the center point of each character by x average and y average value. After that we find the moving path that includes two perpendicular marks at the end of the path. Finally, we adjust Thai handwriting by moving the character up or down along the Moving line. The text's position is changed into the middle point of the Moving line.
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Near point light source location estimation from shadow edge correspondence
(2015-09-23)
Chotikakamthorn, Nopporn
The problem of near point light source location estimation is considered. The approach described here is based on a relationship between the cast shadow edge, the shadow-casting surface, and the light source. Given an optical-depth image pair available from an RGB-D camera, a method for near point light source location estimation is described. The method can be applied to a shadow-casting object with arbitrary and unknown geometry. Exhaustive multidimensional search is avoided by the proposed iterative one-dimensional search algorithm. Experimental results with real images are included.
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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
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Chaveesuk, Singha
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Chotikakamthorn, Nopporn
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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.

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