• Journal of the Korea Society of Computer and Information
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• v.26 no.6
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• pp.97-105
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• 2021

In this paper, we propose BCON, a service that allows individuals to store personal contents safely, and reliably guarantee their ownership of contents, certifying their identities with DIDs(Decentralized identifiers). DID technology, which supports decentralized identification service based on a blockchain that cannot forgery or alter data, allows users to selectively provide their information, controlling personal information and reinforcing their sovereignty over their identity. BCON stores information about the content specified by a user on the blockchain and Authenticates the user's identity based on DID technology. It also provides functions for the user to safely upload and download the user's content to a distributed database. BCON consists of the content service verifier, the content storage service, the content management contract, and the user application, administrating rhe DID registry for Authority management.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.520-522
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• 2004

최근 급속히 증가하고 있는 Digital Content의 생성과 활용으로 인해 인터넷 기반의 Digital Content 유통이 활성화 되고 있다. 하지만 URL의 한계와 Content의 불법복제 및 무단변형과 같은 역기능이 나타남으로써 양질의 콘텐트 생산 유통이 저해되고 있다. 따라서 본 논문에서는 URN 기반의 DOI 식별체계와 Digital Content 보호를 위한 PKI 기반의 공개키 알고리즘, 그리고 콘텐트 제공자의 저작권을 보호하기 위한 Digital Watermarking과 DRM기술을 접목한 강인한 Digital Content 유통모델을 제안하고자 한다.

• Journal of the Korean Society of Clothing and Textiles
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• v.33 no.7
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• pp.1014-1024
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• 2009

The cultural content industry can be stimulated by the production of content based on Korean traditional culture such as Korean court culture. At present, the use of royal costumes of various Korean dynasties for content creation is rare. Less than ten government-supported projects managed by the Korea Culture & Content Agency (KOCCA) are related with Korean royal costumes. Only a handful of tourism-related cultural products (e.g., souvenirs and theme parks) are related to this subject. Fortunately, there are many events that demonstrate traditional court ceremonies; however, there is a need for more investment in academic research to ensure accurate reproduction. There are a number of issue in utilizing traditional royal costumes to produce cultural content that include: a lack of understanding the importance of Korean royal costumes, discrepancies of the content produced based on the historical context, a lack of public knowledge or support, and the lack of the historical accuracy of reproduced content. In order to benefit the most from royal costumes, this article suggests recreating the costumes as a source for further content creation, the development of a database to store information by design features and itemized topics, along with the active support of the government.

• Journal of Biosystems Engineering
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• v.40 no.2
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• pp.137-144
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• 2015

Purpose: The high energy requirement of extraction of oil from jatropha seed and reduction of loss in oil content between whole seed and kernel of jatropha necessitate seed shelling. The purpose of this study is to develop and evaluate the performance of a jatropha seed shelling machine based on seed moisture content. Methods: A shelling machine was designed and constructed for jatropha seed. The components are frame, hopper, shelling chamber, concave, and blower with discharge units. The performance evaluation of the machine was carried out by determining parameters such as percentage of whole kernel recovered, percentage of broken kernel recovered, percentage of partially shelled seed, percentage of unshelled seed, machine capacity, machine efficiency, and shelling efficiency. All of the parameters were evaluated at five different moisture levels: 8.00%, 9.37%, 10.77%, 12.21%, and 13.68% w.b.). Results: The shelling efficiency of the machine increased with increase in seed moisture content; the percentage of whole kernel recovered and percentage of partially shelled seed decreased with increase in moisture content; and percentage of broken kernel, machine efficiency, and percentage of unshelled seed followed a sinusoidal trend with moisture content variation. Conclusion: The best operating condition for the shelling machine was at a moisture content of 8.00% w.b., at which the maximum percentage of whole kernel recovered was 23.23% at a shelling efficiency of 73.95%.

• Journal of Intelligence and Information Systems
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• v.14 no.1
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• pp.101-115
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• 2008

Combining collaborative filtering with some other technique is most common in hybrid recommender systems. As many recommended items from collaborative filtering seem to be similar with respect to content, the collaborative-content hybrid system suffers in terms of quality recommendation and recommending new items as well. To alleviate such problem, we have developed a novel method that uses a diversity metric to select the dissimilar items among the recommended items from collaborative filtering, which together with the input when fed into content space let us improve and include new items in the recommendation. We present experimental results on movielens dataset that shows how our approach performs better than simple content-based system and naive hybrid system.

• ETRI Journal
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• v.29 no.2
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• pp.169-178
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• 2007

With the advent of ubiquitous computing environments, it has become increasingly important for applications to take full advantage of contextual information, such as the user's location, to offer greater services to the user without any explicit requests. In this paper, we propose context-aware active services based on context-aware middleware for URC systems (CAMUS). The CAMUS is a middleware that provides context-aware applications with a development and execution methodology. Accordingly, the applications based on CAMUS respond in a timely fashion to contextual information. This paper presents the system architecture of CAMUS and illustrates the content recommendation and control service agents with the properties, operations, and tasks for context-aware active services. To evaluate CAMUS, we apply the proposed active services to a TV application domain. We implement and experiment with a TV content recommendation service agent, a control service agent, and TV tasks based on CAMUS. The implemented content recommendation service agent divides the user's preferences into common and specific models to apply other recommendations and applications easily, including the TV content recommendations.

• Journal of the Semiconductor & Display Technology
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• v.6 no.2 s.19
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• pp.53-57
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• 2007

In this paper, a new content-based color image retrieval method is proposed, in which both the color content and the spatial relationship of image have been taken into account. In order to represent the spatial distribution information of image, a disorder matrix, which has the invariance to the rotation and translation of the image content, has been designed. This is based on multi-resolution color-spatial information. We present our algorithm in the following section, and then verified the search results with comparison to other methods, such as color histogram, wavelet histogram, correlogram and wavelet correlogram. Experimental results with various types of images show that the proposed method not only achieves a high image retrieval performance but also improve the retrieval precision.

• The Journal of Korean Association of Computer Education
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• v.6 no.4
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• pp.31-36
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• 2003

In the past few years, enormous improvements have been obtained in the field of content-based image retrieval (CBIR). This paper presents a comprehensive survey on the current CBIR systems and some of their challenging technical aspects, which stand as an obstacle on its way to become successful. Furthermore, we have focused on the current state of semantic image retrieval and also we have suggested future promising directions for further research.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.4
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• pp.912-917
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• 2004

The increase of illegal usage and conflict in digital content market would diminish motivation of creators for their work, furthermore break down digital content market on cyber-space. Watermarking technology support to the legal users by the protection technique based on the digital content copyright protection method(DRM). Most of previous digital watermarking have embeded to the content. In this paper, we propose a wavelet based watermarking method which is used for implementing in the frequency domain.

• The Journal of the Korea Contents Association
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• v.12 no.4
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• pp.1-9
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• 2012

The purpose of this study is to present a methodology to effectively produce the e-learning contents in two platform types of PC based and mobile based platforms. Currently, the compatibility problem of flash technology widely used in the e-learning content production of existing PC based platform not supporting flash in some mobile platforms is being created while the condition of accompanying inconvenience in learning due to small screen and difference of input interface is being created in case of using the contents for PC even in case of the mobile platforms in which flash is supported. Considering this situation, this study is presenting a content development methodology that can provide services in both platform types based on standard technologies such as HTML 5. In conclusion, the methodology proposed in this study separates the content and the view of learning contents while supporting to enable content implementation using various forms of views based on the content database that has been constructed to show very efficiently characteristics in the content reuse and the multi platform support categories.