• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.1
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• pp.145-150
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• 2010

In this paper, the performance of cognitive radio network is analyzed in terms of Erlang capacity. To improve the Erlang capacity with respect to primary user (PU) and secondary user (SU) traffic, we propose an efficient radio resource management scheme utilizing the buffer for new SUs and interrupted SUs. Markov model is developed, and analyzed to derive the performances of the proposed spectrum sharing scheme in both primary system and secondary system. To determine the Erlang capacity region, the blocking probability, the forced termination probability and the non-completion probability are calculated. Simulation results provide insight into the advantages of the buffer utilization. It is observed that the supportable traffic loads of PU and SU can be increased significantly according to the buffer length.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.209-214
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• 2010

In this paper, We analyzes the image along the platform (Open Eye), through prevention of dementia or stroke patients and cognitive rehabilitation for the proposed system. This way through the camera image according to user's movement gained OpenCV image processing library, which is based on motion analysis, a part of this rehabilitation is to apply to cognitive rehabilitation. Therefore, this paper proposes a new image analysis system has been exposed to the elderly or stroke patients with dementia, their hand gestures through which patients can detect the image of the cognitive rehabilitation to help them in the analysis of the image analysis system is proposed.

• Korean Journal of Cognitive Science
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• v.12 no.4
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• pp.1-9
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• 2001

Mobile Internet can be used anytime and anyplace thanks to the portability of mobile phones and wireless connectivity to the Internet. Therefore Mobile Internet users can be in various contexts compared with Wire Internet users in stationary contexts. In this research out of various context attributes, we selected physical context attributes of hands feet and eyes and studied how these affect the performance of Internet use and user\\` satisfaction. For this research we made control1ed experiments in performing the given task in each attribute and measured the task accuracy and the subjective satisfaction. The experiments indicated that each attribute doesn\\`t affect the accuracy and satisfaction when it is given individually but when two of more context attributes are given simultaneously in context of disturbance of eyes and motion of legs the accuracy and satisfaction declines. This suggests that the subjects need more attention for the physical context of two or more factors than one factor because of the attention capacity limit. As the result, the attention capacity for the task shrinks.

• Management & Information Systems Review
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• v.37 no.4
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• pp.157-174
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• 2018

The purpose of this study is to examine service acceptance process of Internet-Only Bank centered on perceived usefulness, confirmation, service satisfaction, adoption intention. this study examine relation of perceived usefulness, confirmation, service satisfaction based on previous studies. And we examine the effect of Internet-Only Bank satisfaction on adoption intention. Also, we studied the relationship between perceived usefulness, confirmation, service satisfaction according to Internet-Only Bank services providers. The following are main results of this study. First, perceived usefulness, confirmation have significant effects on service satisfaction. Second, service satisfaction of Internet-Only Bank have a positive effect on adoption intention of Internet-Only Bank. Third, The relationship between perceived usefulness, confirmation and service satisfaction is differ depending on Internet-Only Bank services providers. Based on these findings, in this study examined the significant influence of Internet-Only Bank. Through this study, we propose to marketing practitioners the need for a splitted strategy based on Internet-Only Bank services providers.

• Journal of Internet of Things and Convergence
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• v.10 no.1
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• pp.69-75
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• 2024

This paper proposes an innovative cognitive IoT framework specifically designed for fog computing (FC) in the context of industrial Internet of Things (IIoT). The discourse in this paper is centered on the intricate design and functional architecture of the Cognitive IoT platform. A crucial feature of this platform is the integration of machine learning (ML) and artificial intelligence (AI), which enhances its operational flexibility and compatibility with a wide range of industrial applications. An exemplary application of this platform is highlighted through the Predictive Maintenance-as-a-Service (PdM-as-a-Service) model, which focuses on real-time monitoring of machine conditions. This model transcends traditional maintenance approaches by leveraging real-time data analytics for maintenance and management operations. Empirical results substantiate the platform's effectiveness within a fog computing milieu, thereby illustrating its transformative potential in the domain of industrial IoT applications. Furthermore, the paper delineates the inherent challenges and prospective research trajectories in the spheres of Cognitive IoT and Fog Computing within the ambit of Industrial Internet of Things (IIoT).

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.9-15
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• 2010

Cognitive radio is a technology, which automatically recognizes and searches for temporally and spatially unused frequency spectrum, then actively determines the communication method, bandwidth, etc. according to the environment, thus utilizing the limited spectrum resources efficiently. In this paper, with the imperfect sensing of misdetection and false alarm, we quantitatively investigate the effects of primary and secondary user's queue on the primary and secondary users' spectrum usage through the analysis of continuous time Markov Chain. With the queue primary user's spectrum usage improved up to 18%, and the secondary user's spectrum usage improved up to 50%.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.1-8
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• 2010

Wireless multimedia service through the access to mobile telephone network or data network is a vital part of contemporary life, and the demand for frequency spectrum for new services is expected to explode as the ubiquitous computing proliferate. Cognitive radio is a technology, which automatically recognizes and searches for temporally and spatially unused frequency spectrum, then actively determines the communication method, bandwidth, etc. according to the environment, thus utilizing the limited spectrum resources efficiently. In this paper, we investigate the effects of imperfect sensing, misdetection and false alarm, on the primary and secondary users' spectrum usage through the analysis of continuous time Markov Chain. We analyzed the effects of the parameters such as sensing error, offered load on the system performance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.4
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• pp.31-36
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• 2021

Colour properties can be classified based on hue, brightness, and saturation, and the characteristics of colour perception vary by colour property. In terms of colour perception, surrounding colours are viewed together rather than independently, and the characteristics of the original colour perception may vary depending on the colour characteristics of the surrounding. Thus far, research on colour perception and sensibility has focused on a monotonic environment, which is different from colour perception in real life. As such, a fundamental study on colour perception considering surrounding colours must be conducted. In this study, a psychophysical experiment was conducted, and the results were analysed to study the colour perception characteristics by edge brightness, Edge brightness was set as a variable based on the visual traits that are most sensitive to brightness, and the experiment was conducted using the Munsell colour system to specify the stimulus colour. Based on the analysis of the experimental outcomes, this study reveals the significance of fundamental research data on the visual and perceptual characteristics of colour perception with regard to edge brightness and provides directions for future research.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.193-199
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• 2007

인터넷 쇼핑이 점차 대중화되어가면서 다양한 형태의 인터넷 쇼핑몰이 등장하고 있다. 현재 인터넷 쇼핑몰에 사용되는 상품이미지는 움직임이 없는 정적인 JPEG 이미지부터 빠르게 움직이는 동적인 GIF 이미지까지 다양한 형태를 이루고 있다. 이러한 상품이미지의 움직임 속도에 따라 사용자가 인지하는 쇼핑몰 사이트의 가격대와 상품의 가격대가 다를 것으로 예상했으며 사이트의 상품이미지의 지배적인 움직임 속도가 오프라인 상점을 연상하는데 영향을 미칠 것으로 추측하였다. 실험은 같은 상품 이미지를 동적인 움직임 정도에 따라 세 가지로 분류하여 사용자로 하여금 예상되는 쇼핑몰의 가격대를 매기도록 하였고, 어떤 오프라인 상점을 연상하는지 조사한 결과 사용자들은 정적인 상품 이미지를 사용하는 쇼핑몰 페이지를 고가의 인터넷 쇼핑몰로, 동적인 상품이미지를 사용하는 쇼핑몰 페이지를 저가의 인터넷 쇼핑몰로 인식하였다. 또한 상품 이미지의 움직임과 오프라인 상점의 가격대별 연상이 어느 정도 상관관계가 있는 것으로 밝혀졌다. 이 연구를 통해 동적인 상품이미지와 정적인 상품이미지가 쇼핑몰의 가격대인지 형성에 미치는 역할을 알아보고 가격 관련 사용자 경험에 시사하는 바를 살펴보았다.

• Journal of Digital Convergence
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• v.11 no.5
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• pp.385-394
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• 2013

Recently, as the healthcare market is globalized, the importance of the information on the Internet has been recognized. In this study, the analysis by research model with hypothesis that benefit sought factors of health tourism have a positive effect on behavioral intention of destination selection through tourism brand equity by internet information was carried out. As a result of analysis, benefit sought factors like as health and beauty did not have a positive effect on brand cognition and perceived quality but benefit sought factors like as service and nature had a positive effect on brand cognition and perceived quality. However, benefit sought like as experience did not have a positive effect on brand cognition and perceived quality. And brand equity like as brand cognition and perceived quality had a positive effect on behavioral intention. Thus, according to the results of these hypotheses, policies that foster health tourism in Jeju region will be followed based on product development that considering the importance of the existing service and cognition.