• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.308-315
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• 2016

With the advancement in the area of cloud storage services as well as a tremendous growth of social networking sites, permission for one web service to act on the behalf of another has become increasingly vital as social Internet services such as blogs, photo sharing, and social networks. With this increased cross-site media sharing, there is a upscale of security implications and hence the need to formulate security protocols and considerations. Recently, OAuth, a new protocol for establishing identity management standards across services, is provided as an alternative way to share the user names and passwords, and expose personal information to attacks against on-line data and identities. Moreover, OwnCloud provides an enterprise file synchronizing and sharing that is hosted on user's data center, on user's servers, using user's storage. We propose a secure Social Networking Site (SSN) access based on OAuth implementation by combining two novel concepts of OAuth and OwnCloud. Security analysis and performance evaluation are given to validate the proposed scheme.

• 한국멀티미디어학회논문지
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• 제23권9호
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• pp.1201-1209
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• 2020

Based on the risk factor evaluation for the file format, this paper defines the procedures for presenting the long-term preservation plan for that format and the technical information registry necessary for building the system. This is a procedure to perform a risk assessment for the format, evaluate the risk, and select a long-term preservation strategy based on the information registered in the registry and information on the external signature and internal signature of the electronic record. We also reviewed the criteria for selecting appropriate long-term preservation strategies in the process and provided the criteria for adopting each detailed strategy of migration and emulation, which are long-term preservation strategies. And we implemented this process as a long-term preservation decision support system. This system can be used to provide guidelines for the maintenance, management, service and long-term preservation of information resources of electronic records in public institutions such as National Archives of Korea and Libraries.

• 한국IT서비스학회지
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• 제13권4호
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• pp.309-324
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• 2014

This case study focuses on the preparing a guide for the plan to the companies that want to build a business document system for the centralized services under the cloud computing. Total 3 Operating companies with regard to cloud computing issues are introduced for this purpose. Analyzing the usage and development direction of the selected companies were performed to set up plans. Through this in-depth needs of the user's point of view for the management of business documents, The necessary improvements in the process of collaboration and document sharing were derived. Business documents centralized service plans were proposed based on cloud computing models. Practical experiences of the companies were helpful to present the details of the operational strategy and operational plans. Especially with minimal staff input and verification process, Sample method for the automatic generating of the new document file name is introduced. A test bed before operating the enterprise-wide system were presented with information that is to be considered when building systems.

• 한국정보처리학회논문지
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• 제6권2호
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• pp.315-325
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• 1999

Indexing techniques for distributed resources have much effect on an information service system based on distributed environment like digital library. There is a centralized indexing technique, a distributed technique, and a mixed technique for distributed indexing techniques. In this paper, we propose new distributed indexing technique using EIF(extended Inverted File) structure that mix the centralized technique and t도 distributed technique. And we propose management techniques using EIF structure and retrieval technique using EIF structure. This distributed indexing technique proposed is able to fast process retrieval request and reduce network overload and select servers relevant to query terms. This paper investigated performance of a proposed distributed indexing technique.

• 한국인터넷방송통신학회논문지
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• 제24권1호
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• pp.89-95
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• 2024

요즘 기업의 경쟁력은 조직이 축적한 조직의 지식들을 모든 조직원들이 잘 공유하고 활용하는 능력에 달려있다. 이것을 증명이라도 하듯이 지금 세상은 LLM(거대언어모델)의 기반의 생성형 AI 기술을 이용한 쳇GPT서비스에 대해 집중하고 있다. 하지만, 쳇GPT 서비스를 업무에 적용하기에는 아직 환각성 문제가 많아 어려운 상태이다. 이 문제를 해결하기 위해 sLLM(경량거대언어모델) 기술이 대안으로 제시되고 있다. sLLM을 구성하기 위해서는 기업데이터가 필수적으로 필요하다. 기업데이터는 조직의 ERP Data와 조직이 보존하고 있는 기업의 오피스 문서 지식 데이터이다. ERP Data는 sLLM과 직접 연결하여 활용할 수 있으나 오피스 문서는 파일 형태로 저장되어 있어서 데이터 형태로 변환하여야 sLLM과 연결하여 활용할 수 있다. 뿐만 아니라 파일 형태로 저장되어져 있는 오피스 문서들을 조직을 지식 정보로 활용하기에는 기술적 제약 사항이 너무 많다. 본 연구는 오피스 문서를 파일 형태가 아닌 DB 형태로 저장하는 방법을 제시함으로서 기업이 기 축적 된 오피스 문서를 조직의 지식 시스템으로 잘 활용할 수 있게 하고, 기업의 sLLM에 오피스 문서를 데이터 형태로 제공하여 AI 기술과 접목하여 기업 경쟁력을 향상 시키는데 기여하고자 한다.

• 방송공학회논문지
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• 제23권4호
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• pp.549-558
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• 2018

360 VR(Virtual Reality) 비디오와 같이 고품질의 비디오를 기존 케이블 망에서 IPTV 또는 OTT(Over the Top) SettopBox과 같은 저사양 미디어 서비스 기기를 통해 저지연 라이브 스트리밍 서비스를 할 수 있도록 MPEG DASH(Dynamic Adaptive Streaming over HTTP) 기반의 스트리밍 서버를 설계하고 구현하였다. 또한, 서버 응답 지연 시간을 줄이기 위해 스트리밍 영상 파일(MPD, Segment Files)을 메모리상에 캐싱 하여 서비스 할 수 있는 관리 프로세스를 설계하고 적용하였다. 그리고 실험을 통해 bitrate가 50,000kbps 이상이고, 8K@60P 급의 고품질 분할 영상 스트리밍을 지원하는 것을 확인하였다

• Asia pacific journal of information systems
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• 제14권3호
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• pp.93-120
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• 2004

The current study investigates major factors which influence the acceptance of mobile internet services based on the theoretical backgrounds of the technology acceptance model(TAM) and the flow theory. This research extended the Davis' TAM model(1989) by including the flow concept as another major factor towards the intention to use the mobile device in order to explain the acceptance of divers mobile services. According to the marketing studies(Ghani & Desphande, 1994; Novak, Hoffman & Yung, 2000), flow is regarded a psychological state in which one is absorbed in something he or she is doing, and is known to be widely adopted in explaining one's acceptance in the area of game, sports, and even hobby. This study developed a research model to explain the use of mobile services employing usefulness, ease of use and flow as major research variables, and collected 221 survey responses from the high school students who had experiences with such mobile services as game and audio file download. The results of the current research indicates that usefulness and flow influence the intension to use mobile services, but the effect of ease of use did not appear significant to the intention to use. It was also found that flow affects both usefulness and ease of use, and then ease of use next influences usefulness.

• 융합보안논문지
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• 제12권3호
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• pp.85-92
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• 2012

기존의 보안 관리 수준을 측정하기 위한 방법들이 다양하지만 IT 자산을 중심으로 한 평가만이 이루어지고 있는 관계로 조직 전반에 걸친 분석이 이루어지지 못했다. 따라서 본 논문에서는 보안 관리 수준 점검을 손쉽게 할 수 있도록 웹 기반 보안 관리 수준 분석 도구에 대해 제시한다. 본 도구의 경우는 전사적 정보 보호 관리 방법론인 ISO 27001의 보안통제 항목들을 기반으로 설문 내용을 구성하였다.

• 디지털융복합연구
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• 제12권10호
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• pp.253-258
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• 2014

최근 스마트폰 사용이 증가하면서 빅 데이터 서비스를 제공하는 클라우드 컴퓨팅 기술이 발달하고 있으며, 빅 데이터 서비스를 제공받으려는 사용자 또한 증가하고 있다. 빅 데이터 서비스 중 하둡 프레임워크는 데이터 집약적인 분산 어플리케이션을 지원하는 하둡 파일 시스템과 하둡 맵리듀스로 서비스를 제공하고 있으나, 하둡 시스템을 이용하는 스마트폰 서비스는 데이터 인증시 보안에 매우 취약한 상태이다. 본 논문에서는 스마트폰 서비스를 제공하는 하둡 시스템의 초기 과정의 인증 프로토콜을 제안한다. 제안 프로토콜은 하둡 시스템의 안전한 다중 데이터 처리를 지원하기 위해서 대칭키 암호 기술과 함께 ECC 기반의 알고리즘을 조합하였다. 특히, 제안 프로토콜은 사용자가 하둡 시스템에 접근하여 데이터를 처리할 때, 초기 인증키를 대칭키 대신 타원 곡선 기반의 공개키를 사용함으로써 안전성을 향상시켰다.

• 보건행정학회지
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• 제22권1호
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• pp.29-48
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• 2012

The purpose of this study is to analyze medical expenses by decedents in their last year of life and compare them with those by survivors during the year 2008. This study is conducted firstly in Korea, except some studies focusing on medical cost of decedents from specific diseases. To study this, national health insurance(NHI) claims data was used with medicaid claims data. The study group(decedents) was selected from the insurance entitlement file who were dropped out from January to December of 2008. The control group(survivors) was selected from the entitlement file by stratified sampling with keeping age-sex composition of the study group. The medical expenses of decedents during one year before death were measured and compared with those of survivors by sex and age. And the medical expenses were analyzed by causes of death, and also the expenses were examined by each item of medical services. On average, the medical expense amounted to 11 million Korean Won per decedent during their last year of life in 2008. The medical expense per decedent was 9.3 higher than that of survivor. The death-related expense of under the age 35 was about 16 million Won, compared with 4 million Won in the case of over the age 95, in average. The death-related expense is higher in younger ages. This means that more medical resources are put in to save life in younger ages. Total death-related expenditure took 8.3 percent in total NHI expenditures. Of the death-related medical expenses, the largest one was injection-related cost which shares twenty five percent, and the second largest one was hospitalization charges, and then the third one was surgery cost. The results of this study suggested that we should pay attention to the medical expenses in the last of year of life when we study health care expenditure in Korea. In addition, we have to deliberate health care policy to cope with medical expenditures before death in more efficient way.