• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.13-15
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• 2005

P2P(Peer-to-Peer) 시스템은 대용량의 데이타를 공유하는데 유용하며, 네트워크 구조에 따라 중앙 집중형, 구조적 분산형, 그리고 비구조적 분산형으로 분류된다. 이 중 Gnutella와 같은 비구조적 분산형 P2P 시스템은 확장성과 신뢰성 측면에서 장점을 갖지만, 참여하는 노드의 수가 증가함에 따라 원하는 자원을 액세스하는 비용도 증가하는 문제를 가진다. 데이터 중복을 이용해 이러한 문제를 해결할 경우 중복된 데이타들의 일관성 유지를 위한 기법이 필요하다. 본 논문에서는 특정 노드가 갱신한 데이타를 중복된 사본을 저장하고 있는 다른 노드에 전파하기 위한 하이브리드 push/pull 기반의 갱신 전파 기법을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.397-399
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• 2003

CDN(Content Delivery Network)은 기존의 중앙 집중형 구조를 갖는 multimedia streaming 서비스의 서버 과부하 문제와 서버 주위의 네트웍 전송 속도 급감 문제를 해결하기 위해 서버와 클라이언트 사이에 컨텐츠 캐시 역할을 하는 edge server를 둠으로써 원래 서버로의 요청을 분산 처리하는 컨텐츠 전송 기술이다. 그러나 여전히 대규모 전송이 필요할 경우 원하는 수준만큼의 scalability를 보장할 수 없다. 이에 대한 근본적인 해결방법으로 본 논문에서는 P2P 기반의 CDN 시스템 구축을 위한 첫 단계로서 참여 노드간의 네트워크 토폴로지와 전송 성능간의 관계를 분석해보고자 한다. 이를 위해 다양한 구조의 전송 성능을 평가할 수 있는 환경을 구축하였으며 이를 이용하여 설러 구조에서의 전송 성능 측정 결과를 제시하여 최적의 P2P 전송 네트워크를 결정할 수 있도록 한다.

• Korean journal of communication and information
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• v.63
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• pp.53-75
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• 2013

This study looks into Dooriban movement, which problematizes the ways in which social movements are carried out in everyday settings in modern Korea. Contrary to traditional social movements, Dooriban movement led by active/independent participants -who are locally situated and culturally sensitized- showed a new way of engaging with political power. Making use of qualitative methodology such as in-depth interviews and participant observation, this research examines the implications of emergent cultural practices that redefine and reconfigure the working mechanisms of social movements in Korea today.

• Journal of The Korean Association For Science Education
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• v.30 no.2
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• pp.192-205
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• 2010

We have investigated the recognition for the gifted science education program of middle school students being educated at the local center for the gifted. We developed a questionnaire that includes items for contents of the program, learning environments, participation attitude, effects of the program and improvements, and consists of it5-point Likert items and related descriptive items. 161 students at the local centers for the gifted responded to the questionnaire. The total score was 3.70 on a 5-point Likert scale. The score of effects of the program was highest, learning environments was the lowest. Most of the students referred that the participation of the programs help their schoolwork because of schoolwork preparations & review, learning the process of the solving problem and principle. On the contrary, difficult contents and long lesson hours interrupted their schoolwork. Students recognized that the programs are mainly composed of students' self-activities and the role of teachers is subsidiary. The programs have a good effect on them to increase interest in science and creative thinking. It is necessary that the program be improved in lesson hours, contents of the program, school facilities, and full service.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.5
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• pp.146-156
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• 2021

A smart city refers to an intelligent city solving problems arising from the concentration its population using IT technology. Various services such as safety, transportation, environment, education, and medical care are provided in a smart city. Still, the degree of service experienced by the residents is lower compared to the technological maturity. Hence, the service acceptance intention factor needs to be improved. In this study, User Characteristic and Service Characteristic variables were identified separately to improve the awareness and experience of smart services among citizens of the smart city and analyze the intention of easy service acceptance. Based on the results, the present study is expected to improve citizen's quality of life and form a happy society. This improvement in citizens and society is achieved by drawing active participation from citizens and investments from the government and private enterprise through solving various problems in the city.

• Ecology and Resilient Infrastructure
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• v.5 no.1
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• pp.35-44
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• 2018

Social, economic and environmental problems caused by rapid urbanization have been recently overcome by various civic participation projects. Local governance and resident - led partnership through field - based cooperative operating systems from urban regeneration to village projects are considered success factors. Among these, the village greening project which directly affects the residents and requires spontaneity requires the role and cooperation of the various participating actors due to the sharing of public space and private space. Social capital plays a key role in the sustainability and participation of the above - mentioned business as a relational capital centered on trust and participation, network and norms. Therefore, empirical research is needed. In this study, basic research was carried out to build a formation model of social capital in participation - type greening project expanding urban green space system to living area. We analyzed the elements of participation, the components of business progress, and the factors of social capital formation through literature review and in - depth interviews with participating experts. The purpose of this study is to provide basic data of social capital formation model for analyzing sustainability and activation strategies in the future.

• Korean Journal of Environment and Ecology
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• v.12 no.2
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• pp.156-162
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• 1998

The disposition of ecotourism was surveyed form October 5 to 22 in 1996. 600 persons were participated from 5 big cities including Seoul in Korea. Of those individuals, 48% were males, 52% were females, 50％ of respondents reported that they had gone as far as college, and 38% were 20 years of age. Most percentage of respondents (72%) were not satisfied from their leisure behavior in their daily life, 60% of respondents had a chance to visit outdoor recreation areas per month. The most respondents(75%) didn't hear the concept of ecotourism, but they recognized necessity of the ecotourism development. There was a tendency in the sample for high disposition of ecotourism subjects to be more likely to intend to interest in environmental problems, and participate to environment movement. They were very interested in ecotourism. The differences existed in ecotourists' dispositions of ecotourism, according to their scio-economic characteristics. The potentional ecotourists' intentions of visiting eco-park had strong relationships with the disposition of ecotourism.

• Korean Journal of Construction Engineering and Management
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• v.12 no.3
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• pp.22-30
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• 2011

In the planning phase of domestic urban environment maintenance and improvement projects, a particular problem is the increase in service expenses and project cost with the establishment of plans under circumstances that exclude the residents or have incomplete consent from them and the public organization. This delays the promotion of the project. This study aims to resolve such problems by proposing a measure to introduce a privatepublic consultative body for residents and the relevant departments of the public sector, to encourage them to participate and establish plans together from the beginning. This is expected to contribute to the smooth promotion of the project, as it would remove the conflicting factors that are expected to be generated in the project implementation phase before they could emerge.

• Journal of The Korean Association of Information Education
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• v.25 no.5
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• pp.825-834
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• 2021

This study analyzed learners' satisfaction and in-depth interviews with teachers after operating a software practical curriculum as a real-time video class for fifth and sixth graders in elementary school. The correlation between learner's presence, class overall, interaction, and real-time video class satisfaction showed that the positive correlation between presence, class overall, interaction, and satisfaction with real-time video classes was somewhat high. There were some differences in the real-time video class participation environment and real-time video class satisfaction, but it was not found to be statistically significant. In the case of teachers, it was difficult to respond to problems occurring in each student's individual environment, interactions between students, and individual feedback problems for a sluggish student. To solve this problem, opinions such as preliminary guidance and verification of real-time video class connection environment, error support for sluggish students and individual class participation environment, and feedback on individual tasks using LMS were suggested.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.04a
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• pp.175-180
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• 2000

분산 가상 환경은 고속 통신망과 컴퓨팅 환경의 고급화로 응용 분야를 넓혀 가고 있으며, 보다 현실감 있는 상호작용으로 인해 만남과 대화, 협력 작업, 상거래, 오락 등의 인간의 사회적 활동을 지원하는 새로운 수단으로 자리잡고 있다. 가상 도시와 같은 대규모의 가상 환경에는 공원이나 거리, 건물의 로비 등과 같은 개방적인 공간과 사무실과 같은 업무 공간, 그리고 쇼핑몰과 같은 상거래 공간들이 공존하게 되므로 접근 제어와 보안이 보다 중요한 문제로 대두된다. 따라서, 이 논문에서는 분산 가상 환경내의 모든 사물들을 객체로 인식하고, 객체에 대한 역할을 기반으로 하는 접근 제어 모델을 제안하고, 제안한 모델을 기반으로 접근 제어 관리자를 설계하였다. 설계된 접근 제어 관리자는 가상 환경내 공간의 객체 뿐만 아니라 공간 자체도 하나의 객체로 인식하여 접근 제어를 하였다. 또한, 대규모 공간에서의 중요한 특징인 관리의 용이성과 동적인 변경을 가능하게 하기 위해, 역할을 기반으로 참여자와 객체를 연결하고, 객체가 갖고 있는 행위까지를 제어할 수 있었다.