• Journal of Korea Multimedia Society
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• v.10 no.5
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• pp.569-582
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• 2007

Digital watermarking technique for copyright protection and prevention of illegal copy and distribution can provide the reliable transaction to both buyer and seller in e-commerce through the cryptographic protocol such as 'Buyer-seller watermarking protocol'. Recently there has been researched about some cryptographic protocols for watermarking system but there has no yet mentioned about the implementation of practical watermarking technique in protocol. This paper presents the watermark embedding technique based on POCS in buyer-seller watermarking protocol. The proposed method designs the robust convex set based on EZW and the invisible convex set using PSNR and then projects into two sets until the convergence condition is satisfied. Experimental results verified that BER of watermark that is embedded by the proposed method has lower 0.02-0.10 than BER of the conventional method.

• Journal of Service Research and Studies
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• v.4 no.2
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• pp.1-10
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• 2014

According to recent trends in technological advances and globalization, medical device industry may improve the constitution to meet worldwide medical equipment management system. Also it is holding a strand of mitigation to reach the level of international regulation. In addition, recent legislation tends are to stay limited ranges of industry regulations at least and take as open attitude for integration of new technologies combined medical devices. A greater environmental risk is not likely to work in medical technology, Combinded medical device is used as close to zero risk in most of the human body, which is classified as Class 1. Even medical device such as little or no risk in handling, it is possible to minimize the unnecessary administrative power and a waste of time to occur. For the medical device may be improving people's choices and access, medical equipment operator is expanding to include dealers, because this will be exalted to particular area of the business of the company. In this paper, we investigate the legal prerequisites for the establishment of a medical device. And propose improved regulations in topics in order to facilitate the repair and distribution markets for fair trade.

• Food Science and Preservation
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• v.16 no.5
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• pp.669-674
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• 2009

We prepared puffed instant Nuroong-gi samples using a microwave and investigated the physicochemical characteristics of the products. The quality of Nuroong-gi prepared using a microwave was compared with that of noodles prepared in a steam cooker and pressure cooker in terms of moisture content, color, water binding capacity ratio, viscosity, sedimented volume of insoluble solids, turbidity, and sensory evaluation. The moisture content of Nuroong-gi prepared in a microwave was similar to that of steam cooker and pressure cooker samples. The color (lightness) of steam cooker-prepared noodles was greater than that of noodles cooked using other modes. The water binding capacity ratio fell with increasing microwave cooking time. The viscosity of noodles prepared using a microwave was higher than that of pressure cooker samples and lower than that of steam cooker noodles. The sedimented volume of insoluble solids and turbidity increased with a rise in cooking temperature. Nuroong-gi prepared in a microwave scored higher in sensory evaluation tests than did steam cooker or pressure cooker samples. These results indicate that Nuroong-gi preparation using a microwave is very efficient.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.5
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• pp.1-7
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• 2020

We can build regular customer relationships combining SNS (social networking service) with shopping mall like offline trade. A customer who once purchased is registered as reaular and the relationship continues afterward. The registered regular customer get sthe information about objective product shipment and besides it, he contacts with a story of frams, growth of vegetables, sows to harvests. Consumer can purchase with one click necessary foods as he looks at timeline. Sellers give information about news. discounts to customers. Besides it, food storages, recipes can be given to consumers. The good point here is that selling and promoting can be performed within one account. This is better than link is provided for selling an promoting separately. Like this, besides personal connections using SNS, categorization function gives consumers on line shopping mall service. Once the consumer purchase, he is registered as regular. Besides, the consumers who do not know each other, can share information, suggest products, spread the news.

• Information Systems Review
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• v.12 no.1
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• pp.1-22
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• 2010

Demands onenterprise applications are changing drastically in terms of service and value. Currently enterprises have started to view these applications as service systems, as they combine technology with organizational networks designed to deliver services that satisfy the needs of customers and marketing operations. Social networking is playing a crucial role in this direction and provides organizations with the critical data that enable to build strong relationships with their customers and partners. Enterprises have started using this concept, by integrating social networking services with their enterprise applications such as CRM. In this paper, we combine an open source social networking engine with a CRM (Customer Relationship Management) application to constitute a social CRM system. This can bring the customers closer to the enterprise and facilitate better communication with them. Social Networking Analysis constructs were used to analyze the effectiveness of service system. In the current competitive and economically challenging conditions, salespeople needs to quickly and effectively establish meaningful communication with customers. Our approach can address this issue, by handling the changing customer demands in minimal time, and increases service quality and business value.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.7
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• pp.1405-1414
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• 2011

This paper analyzes the impact of the change in telecommunication regulation on network investment such as the integration of telecommunication service. The integration of telecommunication service plays a role of separating the behavior regulation from entrance regulation and reducing a entrance constraints. Therefore, it is expected that the market spill over effect is high through the improvement of behavior regulation such as interconnection regulation, facilities provisions, retail price regulation, bundling, number portability of VoIP. This paper discusses the critical factor affecting the decision making process in respect of the firm level and analyzes the impact path guiding investment and innovation. Finally, the paper proposes the guideline for telecommunications policy.

• Korean Journal of Microbiology
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• v.45 no.1
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• pp.69-73
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• 2009

Proteases are degradative enzymes which hydrolyze a peptide bond between amino acids and they are abundantly applied to commercial field. In order to investigate optimal medium compositions of carbon and nitrogen source for enzyme production, modified STY medium containing 0.15% yeast extract were used as basal medium. When galactose was used as carbon source, enzyme activity showed 1.3 higher than that of glucose. For nitrogen source addition of casamino acids to basal medium in place of tryptone showed lowest activity, whereas addition of malt extract showed maximal activity. The optimum temperature and pH of extracellular protease were found to be $35^{\circ}C$ an pH 8.5.

• The Journal of the Korea Contents Association
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• v.17 no.4
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• pp.510-519
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• 2017

Our world is communicating by digital network that transcends time and space. In such world of rich technology, people are longing for humanity and analog esthetic. 'Art' stimulates analog esthetic and 'design' is a good and easy tool to show personal esthetic preferences. This study is about the convergence of digital and analog art focusing on the researcher's artwork series. The series is derived from series. They are made by cut and deconstructed pieces from the original series. I assembled these pieces into another creation by using graphic editing programs. I looked into the succession cases of art and design collaborations and developed various design products with the assembled artwork images. Through this, I want to communicate more familiarly with the world widely connected to network viewers. There are already many fine artists making their artworks into design products. Collaboration with cultural art and commercial product provides win-win effect to artist, company, and consumer. It also creates innovative products and values. In this study, I try to design products from various fields using my artwork images, and research about how to promote the artist and art products effectively to the world.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.111-118
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• 2023

The purpose of this study is to study jewelry designs presented to general consumers who seek new products and diversity. We would like to present a modular jewelry design with a structure and combination method that is distinct from jewelry in a multimodal replacement method that allows various product modules sold in the past to be worn interchangeably. Problems are likely to occur when a number of existing rather small parts are manufactured in a complex combination method, and difficulties may follow when consumers replace decorative parts and lose them in the process of assembling small fixture parts. Therefore, in order to reduce these problems, we try to make it different from jewelry products made with a simple and simple design so that it can be easily replaced and worn without the need for other coupling parts, and produced using the latest 3D printer (Rapid Prototyping). In this study, based on the experience and know-how gained while engaging in field work, it was possible to make a real object and focused on minimizing problems during the production process, and through this, time and economic loss can be reduced. The purpose of the study is to produce improved jewelry products by expressing more sophisticated and differentiated shapes by using 3D programs (CAD).

• The Journal of Korean Academy of Prosthodontics
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• v.49 no.3
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• pp.191-196
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• 2011

Purpose: In this study, we evaluated the bond-strength between a few metal ceramic-alloys and veneered-porcelain and found if the bond strength of metal-ceramic alloy with lower gold content than the presently used gold alloy was high enough. Materials and methods: For this study, after plasticizing porcelain only for gold alloy, metal specimen was fabricated using Ni-Cr alloy and gold alloy with different gold content. Three point flexural test were performed to measure their bond-strength. Results: The bonding strength of Group 1 to porcelain was $40.62{\pm}3.32$ MPa, which was the highest (P<.05). In sequence of decreasing value, Group 2 (75%) was $37.47{\pm}1.57$ MPa, Group 3 (52%) $35.85{\pm}1.48$ MPa, Group 4 (51.5%) $35.04{\pm}1.34$ MPa, Group 5 (32%) $33.17{\pm}1.62$ MPa, Group 6 (10%) $30.75{\pm}1.21$ MPa. Bonding strength of Group 3 and Group 4 to porcelain did not show statistically significant difference with comparison to that of Group 5 (Duncan's test, P>.05), while there was a significant difference between that of Group 2, Group 3 and Group 4 and that of Group 6 (Duncan's test, P<.05). The bonding strength between gold alloy and porcelain increased according to the content of gold. In all experimental groups showed higher value than 25 MPa, which is the least value recommended by ISO 9693. Conclusion: In all groups, bonding strength was higher than 25 MPa, which is the least value of ISO9693. Therefore, it is considered that metal gold alloy with low gold content is clinically usable.