• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.496-498
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• 2002

최근 멀티미디어 메타데이터의 국제 표준인 MPEG-7 표준화 활동이 활발히 이루어짐과 함께 메타데이터를 이용한 멀티미디어 컨텐츠 서비스가 이동환경에서 중요한 응용분야로 자리 매김 할 것으로 예상된다. 이런 에러 경향이 큰 매체들은 안정적인 비디오 전송을 위해 에러에 강간한 여러 기법들이 연구되어 왔다. 본 논문은 MPEG-7 멀티미디어 메타데이터를 에러 발생율이 높은 이동 환경에서 안정적인 전송을 위한 에러 강건화 방법을 처음으로 시도한다.

• Korean journal of communication and information
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• v.19
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• pp.155-184
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• 2002

Mobile phone users have diversified human factors: their channel orientations are different, and the degrees of unwillingness to communicate vary. We examined the effect of human factors on the use of mobile phone, such as the diversity of mobile phone use, the appropriateness of mobile phone, and the aversion to mobile phone as well as the interpersonal communication network through mobile phone. For our sample we surveyed college students and their family members who are older than 400. We found that the more social presence a mobile phone user gets through the mobile phone, and the more familiar to the mobile phone he/she is, (1) the more diversified is the use of mobile phone service, (2) the higher is the level of acceptance of the mobile phone as an interpersonal communication media, and (3) the lower is the level of aversion to the mobile phone. In contrast, those who have some level of aversion to the face-to-face communication, seem to form very limited interpersonal communication network through mobile phone. Their use of mobile phone is also very limited.

• Journal of Korea Multimedia Society
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• v.13 no.1
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• pp.93-101
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• 2010

A USB flash drive is a portable storage device. For its promising moderate price, portability and high capacity USB flash drive users are increasing rapidly. Despite these advantages USB flash drives have critical problems as well. Such as personal information data leakage due to easy loss of the portable device. As these personal information leakage incidents increases various security measure solutions are produced and distributed. Despite these security measures and solutions it is not enough to perfectly protect personal data leakage. Hence the necessity of a more concrete, secure, user-friendly security measure solution is required. In this paper we provide you with portable USB flash drive security solution analysis and provide you with the latest secure, user-friendly security measure solutions.

• Journal of Soil and Groundwater Environment
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• v.14 no.6
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• pp.101-107
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• 2009

Carboxymethyl cellulose (CMC) as stabilizer is expected to facilitate in-situ delivery of zero-valent iron (ZVI) nanoparticles in a contaminated aquifer because it increases dispersity of ZVI nanoparticles. This work investigated the transport of CMC-stabilized ZVI nanoparticles (CMC-Fe) using column breakthrough experiments. The ZVI nanoparticles (100 mg/L Fe) were transportable through sand porous media. In contrast, non-stabilized ZVI nanoparticles rapidly agglomerate in solution and are stopped in sand porous media. At pH 7 of solution approximately 80% CMC-Fe were eluted. When the pH of solution is below 5, 100% CMC-Fe were eluted. These results suggest that the mobility of CMCFe was increased as pH decreases. In the mobility test under different ionic strengths using $Na^+$ and $Ca^{2+}$ ions, there was no signigficant difference in the mobility of CMC-Fe. Also, in the experiments of effect of clay and natural organic mater (NOM) on the mobility of ZVI, there was no significant difference in the mobility of CMC-Fe not only between 1 and 5% clay, but 100 and 1000 mg/L NOM. The results from this work suggests that the CMC-Fe nanoparticles could be easily delivered into the subsurface over a broad range of ionic strength, clay and NOM.

• Journal of the Speleological Society of Korea
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• v.35 no.36
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• pp.13-31
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• 1993

관광지리학의 대부분의 논문에서는 관광과 교통의 관련성을 설명함과 동시에 그 중요성을 지적하고는 있지만, 그 관계를 중점적으로 다룬 논문은 미약한 실정이다. 제야신도(1975)는 기계적 교통수단이 거주지와 관광대상지 간의 왕복이동 매체로서의 필요성을 지적하였고, P. Lavery(1977)는 교통로와 리크레이션의 형태, 교통로와 접근가능성, 리크레이션 자원으로서의 교통로, 교통로의 관리 등 교통과 관광의 관련성에 대하여 논하였고, 임한수(1992)는 교통이 관광 성장의 원인이자 결과이며, 접근성은 관광지의 개발과 성장에 지대한 영향을 준다는 것을 지적하였다.(중략)

• The Journal of the Korea Contents Association
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• v.10 no.7
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• pp.88-97
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• 2010

Recently the more convenient services are provided to people in the city in line with the change of city paradigm and the recent development of ubiquitous. For example, Information on bus arrivals an effective advertisement the combination of high technology and departures through smart-phones. However, in respect of the mobile advertisement, because of difficulties such as the means of transferring the mass storage data or the burden of communication charges. there need means to improve such difficulties. This study has been conducted aiming to overcome such difficulties. This study suggests the strategic differentiation plan through the analysis of the media characteristics such as real time service information when in traveling, U-Bus business model in the category of mobile advertisement, etc. and also the concrete system establishment plan from the operation center via network to the delivery of the advertisement through vehicle terminals. In respect that this study suggests the implications as a practical business model through the fusion of high technology and diverse media. It has great significance.

• Journal of Global Scholars of Marketing Science
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• v.7
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• pp.127-146
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• 2001

Attitude toward the advertising is widely used in studies of traditional mass media advertising. As internet marketing becomes more important, attitude toward the website will gain parallel status in evaluating effectiveness. And also, studies on relationship among attitude toward the website, attitude toward the advertising, attention to the commercial, attitude toward the brand, & purchase intention was needed. This study sets a hypothetical model about the relationship among attitude toward the website, attitude toward the advertising, attention to the commercial, attitude toward the brand, & purchase intention. And to testify this model, 10 hypotheses were set. The results of the analysis, all variables were related significantly.

• Journal of Digital Contents Society
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• v.9 no.1
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• pp.41-51
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• 2008

In a circumstance that the development of mobile media through the on-line consumer desire in the era of Web 2.0 has promoted extension of personal mobile media on the part of consumers, this study examined consumer trends depending on use of e-learning contents through mobile media. In connection with tendencies through mobile prosumers' consumption patterns and use of mobile educational contents, I analyzed user demands based on characteristics of personal media centering around a communities of e-learning portals. Direction of e-learning technological development calls on mobile communication companies to open their networks and share platform following digital convergence. E-learning contents should be produced in a custom-made way for the personal media. This study is aimed at contributing for advancement of e-learning contents consumers' user convenience implicating examination into consumer demands which are necessary to invigorate e-learning contents.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2003.12a
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• pp.625-633
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• 2003

무선랜은 현재 무선 네트워크에서 매우 중요한 역할을 차지하며, 앞으로의 차세대 무선 통합네트워크에서 또한 그 비중이 매우 높아 질 것이다 특히 핫스팟과 같은 공중망서비스의 확산으로 무선 인터넷 등의 차세대 정보 컨텐츠 산업의 중요한 매체로 부각되고 있다. 이에 부합하여 무선랜 서비스에 있어 사용자의 프라이버시(Privacy) 및 접근제어(Access Control), 인증(Authentication), 과금(Accounting), 빌링(Billing) 등의 다양한 보안 문제가 중요한 이슈로 대두되고 있다. 본 논문에는 공중 무선랜에서의 이동성이 고려된 인증 모델을 여러 국제 표준에 맞추어 제안하고, 그에 대한 검증 결과를 함께 제시한다. 제안된 모델은 상호 연동성 및 호환성을 보장하기 위해 Diameter를 기반 기술로 사용하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.610-612
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• 2003

본 논문은 무선 셀룰러 시스템 환경에서 일정구간을 이동하는 지하철, 기차와 같이 규칙적인 이동 패턴을 보이는 운송 매체에 탑승한 사용자들의 이동성을 지원하기 위해 PGLT(Profile­based Group Location Tracking) 기법을 제안한다. 최근 무선 통신 기술의 발전으로 인한 이동 사용자(Mobile Terminal, MT)의 급증은 시그널링 트래픽의 증가로 이어져 결국 위치 관리 비용까지 높아지게 되었다. MT들이 동시에 새로운 등록 영역으로 이동할 때 GLT(Group Location Tracking) 위치 관리 기법에서는 기존 IS­41의 각 사용자들의 개별적인 위치 갱신 요청 대신에 그룹을 이용한 위치 갱신 요청으로써 위치 관리 비용을 줄였다. 그러나 본 논문에서 제안하는 PGLT 기법은 GLT 기법을 향상시킨 기법으로서, 사용자들의 규칙적인 이동 패턴 특성을 살린 프로파일 정보를 이용하여 그룹에 대한 위치 갱신 비용까지도 줄일 수 있다. MSRP­VLR(Mobility Scheduler on Regular Path)과 RMB(Regular path Movement Buffer)를 이용하여 일정구간을 이동하는 TV(Transportation Vehicle)가 위치 갱신 요청을 하면, MSRP­VLR은 이동 경로에 대한 프로파일 정보를 보내어 TV의 RMB에 저장함으로써 그 경로를 이동 시 그룹에 대한 위치 갱신 요청을 할 필요가 없게 된다. 따라서 PGLT 기법은 GLT 기법의 그룹 위치 갱신 비용을 줄임으로써 일정구간을 이동하는 TV에 탑승한 많은 사용자들에 대한 위치 관리 비용을 현저히 줄일 수 있다.