• 디지털콘텐츠학회 논문지
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• 제17권2호
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• pp.81-88
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• 2016

일반적인 빈발패턴 탐사 방법은 항목의 빈발도만을 고려한다. 그러나 유용한 정보를 추출하는 데 있어 빈발도와 더불어 고려해야 하는 것은 빈발항목이 아니더라도 연관된 항목이 주기적으로 함께 발생한다면 시기나 시간에 따라 관심의 중요도가 변화하는 것을 고려해야 한다. 즉, 시간에 따라 사용자가 요구하는 서비스의 중요도는 다르므로 각 서비스 항목에 대한 중요도의 값을 고려하여 마이닝 하는 방법이 필요하다. 본 논문에서는 서비스 온톨로지 기반으로 가중치를 이용한 서비스 빈발 패턴을 추출하는 마이닝 기법을 제안한다. 제안하는 기법은 시공간 상황을 기반으로 서비스의 중요도를 고려한 가중치를 부여하여 연관 서비스를 발견한다. 새롭게 탐사되는 서비스는 저장되어 있는 서비스 규칙과의 새로운 조합을 통해 사용자에게 최적의 서비스 정보를 제공할 수 있는 기반이 된다.

• 디지털산업정보학회논문지
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• 제5권4호
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• pp.263-272
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• 2009

Nowadays, lots of software that have similar functions is being produced. Hence it is getting more important to select the best and suitable software for each individual or company. Moreover, there are few trustworthy materials regarding to the objective procedure and criteria for the best evaluation of the software quality. To overcome these problems, benchmarking has been carried out. However, benchmarking is also confronting the limit of quality evaluation verification due to the difficult of the objectification of the major test items. To solve these problems, some others try to evaluate the quality of software using objective criteria of evaluation based on ISO/IEC standards. Nevertheless, this method using these defined evaluation items and criteria may result in not very reliable outcome. Therefore, this paper offers the evaluation items reflected in the characteristics of each software in order to prove the validity of the proposed method. Moreover, the objective and quantitative criterion which analyzes and reflects the organization characteristics using AHP methodology is applied to the experiment and performance evaluation. Hence we expect that the proposed method provides the needs of the re-establishment of software quality evaluation criteria and the improvement of process in terms of management.

• 디지털융복합연구
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• 제13권1호
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• pp.257-262
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• 2015

해킹과 같은 사이버 공격의 약 75%가 애플리케이션의 보안 취약점을 악용하기 때문에 안전행정부에서는 코딩 단계에서부터 사이버 공격을 막을 수 있고 보안취약점을 제거할 수 있는 시큐어 코딩 가이드를 제공하고 있다. 본 논문에서는 안행부가 제시한 시큐어 코딩 가이드 7개의 항목들에 대해 AHP기법을 사용하여 우선순위를 찾고 중요도 분석을 하였다. 그 결과 '에러 처리'가 가장 중요한 항목으로 결정되었다. 현재 소프트웨어 감리에 시큐어 코딩에 관한 항목이 없는데, 이 분석 결과는 소프트웨어 개발 과정 중 감리 기준으로 유용하게 사용될 것이다.

• 디지털융복합연구
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• 제15권4호
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• pp.489-497
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• 2017

본 연구는 사회복지관에서 사례관리를 실천할 때 기본적으로 수행해야할 사례관리활동의 목록을 과학적 방법에 기반하여 개발하는 데 목적을 두었다. 이를 위하여 먼저 문헌조사와 전문가들의 내용타당도를 확보하여 89개의 예비항목을 개발하였다. 체계표집방식을 활용하여 전국의 사회복지관 127개소를 무작위로 선정하고, 각 기관에서 현재 사례관리를 수행하고 있는 실무자 277명을 대상으로 척도의 타당화를 확인하였다. 탐색적 요인분석, 신뢰도, 타당도 분석을 통하여 최종적으로 11요인의 61개 항목으로 구성된 사례관리활동목록을 개발하였다. 개발된 사례관리활동목록을 바탕으로 실천전략을 제시하였다.

• 디지털산업정보학회논문지
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• 제15권3호
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• pp.129-137
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• 2019

Recommendation systems help users by suggesting items such as products, services, and information. However, most research on recommendation systems has not considered people's moods although the appropriate contents recommended to people would be changed by people's moods. In this paper, we propose a situation-based recommendation system which exploits people's mood. The proposed scheme is based on the fact that the mood of a user is changed frequently by the surrounding environments such as time, weather, and anniversaries. The environments are defined as feature identifications, and the rating values on items are stored as feature identifications at a database. Then, people can be recommended diverse items according to their environments. Our proposed scheme has some advantages such as no problem of cold start, low processing overhead, and serendipitous recommendation. The proposed scheme can be also a good option as of assistance to other recommendation systems.

• ETRI Journal
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• 제27권5호
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• pp.595-607
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• 2005

The widespread use of the Internet has led to the problem of intellectual property and copyright infringement. Digital rights management (DRM) technologies have been developed to protect digital content items. Digital content can be classified into static content (for example, text or media files) and dynamic content (for example, VOD or multicast streams). This paper deals with the protection of a multicast stream on set-top boxes connected to an IP network. In this paper, we examine the following design and architectural issues to be considered when applying DRM functions to multicast streaming service environments: transparent streaming service and large-scale user environments. To address the transparency issue, we introduce a 'selective encryption scheme'. To address the second issue, a 'key packet insertion scheme' and 'hierarchical key management scheme' are introduced. Based on the above design and architecture, we developed a prototype of a multicasting DRM system. The analysis of our implementation shows that it supports transparent and scalable DRM multicasting service in a large-scale user environment.

• 산업기술연구
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• 제33권A호
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• pp.81-88
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• 2013

In this paper, we study the current situation of digital divide caused by accessibility disparity to information in Korea. We investigate leading causes and classes of people of digital divide, and also investigate phenomena which arise from such digital divide. In the investigation, we survey related works and additionally carry out questionnaire study in which we make questionnaire items ourselves. Finally, we discuss various measures to resolve digital divide in Korea based on the study results.

• Educational Technology International
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• 제20권1호
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• pp.1-24
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• 2019

The purpose of this study is to determine priorities for designing digital citizenship education based on the key indicators of importance-performance. Survey data were collected from 283 university students in South Korea and analyzed with Importance-Performance Analysis to diagnose the current level of digital citizenship and draw their needs for educational treatment. The results showed that for all the factors except the Technical Skills (TS), the level of importance was significantly higher than that of performance. Another finding indicated that in the Importance-Performance matrix all the factors were located in the first quadrant (i.e. maintaining the current state) and the third quadrant (i.e. low demands for improvement). Specifically, two items located in the second quadrant where urgent treatment is required could have to do with the increasingly active participation in socio-political issues raised in South Korea. This study offered a window into what to focus on when designing digital citizenship education based on the systematic analysis of the needs for digital citizenship education in South Korea.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅲ
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• pp.1419-1422
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• 2003

Multimedia contents what we call Digital Items include various types of resources such as music, speech, text, video, graphics, and so on. The current Adaptation QoS described in the ISO/IEC 21000-7 CD-Part 7: Digital Item Adaptation, however, lacks adaptation methods for audio signals. The goal of this paper is to provide adaptation methods that are necessary to deal with audio signals. Two operations are introduced in order to adapt audio items. One method is to make use of the functionality of Fine Grain Scalability, and the other is intended to drop the channel of audio output channel. This paper provides a DIA description tool that associates the operators with the corresponding values of the constraint and the utility. Furthermore, the operations are evaluated and compared to alternative solutions.

• 한국항행학회논문지
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• 제13권3호
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• pp.432-437
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• 2009

급속한 통신의 발달로 지식과 정보가 디지털화 되고 유통이 활발히 이루어지고 있으나 디지털자산의 오남용 및 보안문제가 빈번히 발생되고 있다. 본 논문에서는 콘텐츠의 오남용사례와 콘텐츠 보호기술을 분석하며 이를 통해 온라인상의 콘텐츠 오남용 방지를 위한 보호기술을 위한 중요 항목을 제안한다. 본 중요 항목은 기술기준 수립을 위한 중요 요소로 활용 될 수 있을 것으로 기대된다.