• Journal of Korean Library and Information Science Society
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• v.45 no.4
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• pp.45-65
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• 2014

The purpose of this research is to examine the characteristics and current status of OASIS, a web archive, developed and operated by the National Library of Korea. From December 2013 to November 2014, an analysis of a numerical growth and subject distribution of 55,581 websites archived at OASIS shows many problems in quality, including an overwhelming proportion of 'Social Science' and its subclass 'Politics', consequential lack of balance in subject distribution, lack of authority or scholarly value of some contents, unclear application of selection criteria for personal creators/publishers, and inaccurate and overlapping statistics. Despite an impressive growth in quantity, immediate improvement of selection policies and quality control is needed.

• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.221-228
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• 2007

It is more important how to maintain and develop the company than starting any business. The matter of trust building in the early stage of start up company is a main cause to make or break business performance. This study analyzes the primary factor to the influence of matter of trust formation in the early stage of starting business at internet shopping mall. Also, We are here concerned with the strategies on the building brand to shopping mall of e-company and the increasing sales. To accomplish the aim of this paper is examined a concept of trust, consumer's purchase behavior and the factor of trust formation from the basis of preceding research, It was found from the result of an hypothesis testing for positive analyze that information quality, web design and shopping convenience influence factors to the initial trust.

• The Journal of the Korea Contents Association
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• v.11 no.2
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• pp.446-456
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• 2011

The purpose of the study is to understand the characteristics of consumers and to provide useful information for the wine vendors to make future sales strategy and a marketing plan according to the origin of the imported wine thorough the factors influencing consumer preferences and purchase intentions. The questionnaires were distributed to consumers who had purchased wine and 224 was collected then analysed. As a result, the origin of the wine had a significant effects on quality and risk perception when consumers evaluate products. Also, the origin of the wine had a significant on consumer's purchase intention.

• The Journal of the Korea Contents Association
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• v.8 no.8
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• pp.1-8
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• 2008

Overlay Multicast is an effective method for optimal utilization of system resources and network bandwidth without a need for hardware customization. It is an effective method of providing Personal Internet Broadcasting Service for better Quality of Service to many users. In this paper, we propose a multicast tree that uses Local Swap method. In order to prove the effectiveness of the new technique suggested here, using the proposed method and personal internet broadcasting service, information is abstracted, compared and analyzed under various overlay multicast algorithm conditions. We have proved that the suggested local swap technique is more effective by comparing it with other existing techniques in various methods such as using various overlay based multicast algorithm simulation.

• Electronics and Telecommunications Trends
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• v.18 no.2 s.80
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• pp.79-88
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• 2003

무선인터넷 서비스는 이동통신 사업자들에게 강력한 추가수익원으로 떠오르고 있으며, 활성화를 위하여 장기적이고 효율적인 정책대안 수립이 절실한 시점이다. 본 연구에서는 무선인터넷 산업의 현실을 올바로 파악하고자 하는 노력의 일환으로 무선인터넷 사용자들에 대하여 설문조사를 수행하였으며, 그 결과를 무선인터넷 이용환경, 이용실태, 평가 등 세 부분으로 나누어 서술하였다. 무선인터넷은 엔터테인먼트용 콘텐츠의 이용도가 높아 여가생활에 도움을 주고 있지만, 실생활에는 아직 큰 도움이 되지 못한다는 평가를 얻었다. 그리고 통신요금에 대한 불만이 가장 높은 것으로 나타나, 무선인터넷 서비스 확산에 큰 장애요인으로 떠올랐다. 그리고 정액제에 대한 높은 선호를 확인함으로써 통신요금 체계도 무선인터넷 확산에 걸림돌이 되고 있는 것으로 판단하였다. 한편 본 조사에서는 전자우편의 이용횟수, 무선인터넷 및 음성통화의 하루평균 이용시간, 통신요금 및 정보이용료 지출액 등에서 여성의 활용도가 활발한 것으로 나타나 이동통신 서비스 확산에서 여성의 역할이 부각되었다. 결론적으로 우리나라는 무선인터넷 서비스 확산을 위한 하드웨어적인 준비는 거의 완료되었으나 요금수준 및 체계, 통신품질, 콘텐츠 등 소프트웨어 측면에서의 준비는 다소 미비한 것으로 판단되며, 해당 분야에 대한 집중적인 연구와 투자가 필요한 시점으로 생각된다.

• Journal of Science Education
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• v.34 no.2
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• pp.225-236
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• 2010

The purpose of this study is to analyze and evaluate the Cyber Home Learning contents of Earth science area in the basic course of the $10^{th}$ grade. For this purpose, we applied the 'Cyber Home Study Content Quality Control Tool' presented in Elementary Secondary Education e-Learning Quality Management Guidelines (Ver.2.0)' of Korea Education & Research Information Service(2008). The results of Cyber home learning contents analysis are as follow: First, it was presented that the study guide introduced the contents which should be studied for one class, properly. And it was not analyzed that the diagnosis assesment was not completed in the initiative study; Second, it was possible to study choosing the contents fitting the learner's level of learning in the main study, it was comprised of about 10 minutes. Third, it was performed without feedback for incorrect answers in the learning assessment, just the number of wrong questions. And the learning arrangement present the important contents learned in that class, summarizing and arranging again. The results of evaluating the contents in Cyber Home Learning are as follows: First, in evaluation section of instructional design, many text materials which were so difficult for learners to read were explained, being provided. Besides, the systematic structures leaves much to be desired, in view of learners' learning experience, contents, and environment. And in evaluation section of learning contents, the error of contents caused the learning contents not to appear, the amount of learning in each section was found too much. Second, in evaluation section of the strategy for Teaching and Learning, when we mention the strategy of Self Directed Learning, the environment to make learners search for information free and self-study possible was not possessed well. And in evaluation section of interaction, it was found that a simple click caused the learning to go on. Third, in evaluation section of evaluating, it was evaluated that there was wanting in consistency in learning aims, contents, evaluation contents.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.5
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• pp.231-240
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• 2015

Medical imagery require to protect the privacy with preserving the quality of the original contents. Therefore, reversible watermarking is a solution for this purpose. Previous researches have focused on general imagery and achieved high capacity and high quality. However, they raise a distortion over entire image and hence are not applicable to medical imagery which require to preserve the quality of the objects. In this paper, we propose a novel reversible watermarking for medical imagery, which preserve the quality of the objects and achieves high capacity. First, object and background region is segmented and then predicted error histogram-based reversible watermarking is applied for each region. For the efficient watermark embedding with small distortion in the object region, the embedding level at object region is set as low while the embedding level at background region is set as high. In experiments, the proposed algorithm is compared with the previous predicted error histogram-based algorithm in aspects of embedding capacity and perceptual quality. Results support that the proposed algorithm performs well over the previous algorithm.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.837-841
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• 2009

언제, 어디서나 컴퓨터 사용과 통신이 가능한 유비쿼터스 환경의 구축과 개발은 부존자원이 부족한우리나라의 산업 전략에 부합하며 현재 우리나라가 보유한 정보통신 관련기술의 우위를 바탕으로 성장할 가능성이 큰 분야로써 정부가 미래의 10대 성장 동력으로 선정한 분야의 한가지 이다. 배전시스템에서의 이 분야 기술 개발의 핵심내용은 유비쿼터스 기술을 활용한 고 신뢰도의 배전계통 운용 및 높은 수준의 전기품질 관리체제 구축 그리고 이를 통한 관련 산업 즉, 전력거래, 전력시장 유지 및 운영을 위한 핵심 세부 콘텐츠와 부가서비스의 창출을 위한 기반 인프라의 개발 및 구축에 있는데, 이 기반기술의 중심에 배전시스템이 있으므로 이를 고 신뢰, 고품질 기반의 시스템으로 지능화하는 것이 필요하다. 따라서 본 논문에서는 태양광, 풍력 등의 분산전원이 계통에 연계되는 장래의 스마트배전시스템에 대하여, 기존의 배전계통의 전압조정방안과 비교, 분석하여 기술적인 적합여부를 종합적으로 평가하고자 한다.

• Journal of Broadcast Engineering
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• v.25 no.4
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• pp.560-568
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• 2020

In recent years, as network technology develops, the usage of streaming services by users is increasing. However, the complexity of streaming services is also increasing due to various terminal environments. Even when streaming the same content, it is necessary to re-encode the content according to the type of service. In order to solve the complexity and latency of the streaming service, Moving Picture Experts Group (MPEG) has standardized the Common Media Application Format (CMAF). In addition, as content transmission using a communication network becomes possible, the Republic of Korea's Ultra High Definition (UHD) broadcasting standard has been enacted as a hybrid standard using a broadcasting network and a communication network. The hybrid service enables various services such as transmitting additional information of contents or providing user-customized contents through a communication network. The Republic of Korea's UHD transmission standard utilizes MPEG Media Transport (MMT), and Mobile MMT is an extension of MMT to provide mobile network-specific functions. This paper proposes a method of inserting CMAF contents suitable for various streaming services using signaling messages of MMT and Mobile MMT. In addition, this paper proposes a model for content insertion system in heterogeneous network environment using broadcasting and communication networks, and verifies the validity of the proposed technology by checking the result of content insertion.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.192-195
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• 2010

영상 정보의 정확성을 필요로 하는 다양한 서비스 및 여러 학문 분야의 적용성으로 인해 물리적인 한계성을 극복할 수 있는 고해상도 영상처리 기법의 요구가 대두되고 있다 뿐만 아니라, 인터넷 상의 디지털 콘텐츠 중의 하나인 동영상 UCC의 제작환경이 보편화됨으로써 비전문적인 제작으로 인한 다양한 형태의 해상도 저하 및 영상의 왜곡 현상이 발생하여 고품질의 영상을 추구하는 사용자들의 요구를 충족시키지 못하고 있다. 이러한 문제점을 해결하기 위한 압축 동영상의 개선 된 영상 정보를 획득하기 위한 연구가 이루어지고 있지만 다음과 같은 문제점이 있다. 기존의 방법은 일반적으로 저역 통과 필터 기법과 정규화 영상 복원 방식으로 구분되어 연구되고 있으며, 저역 통과 기법은 계산량 측면에서 장점이 있으나, 영상과 양자화 정도에 따라 적응적이지 못한 단점이 있다. 또한 정규화 복원 방식은 압축 영상의 시각적으로 불편한 현상의 완화 정도를 결정하는 정규화 매개변수를 일괄적으로 모든 화소에 적용해, 화소의 위치에 대한 적응도가 낮고 정규화 매개 변수 선택 시 원 영상에 대한 정보를 알고 있다는 가정을 사용했으므로 실제 사용이 불가능하며, 영상들 사이의 불균일로 인해 적응적으로 처리하지 못하는 단점이 있다. 본 연구에서는 이러한 문제점을 극복할 수 있도록 압축 정보 활용을 통한 POCS 방식을 사용한 coding artifact 제거 방식에 대해 기술한다.