• Journal of Korea Multimedia Society
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• v.3 no.3
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• pp.280-289
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• 2000

This paper presents an efficient method to provide seamless communication in mobile wireless networks. The goal of seamless communication is to provide disruption free service to a mobile user. A disruption in service could occur due to active handoffs. There are many user applications that do not require a total guarantee for disruption free service but would also not tolerate very frequent disruptions. This paper proposes an extended staggered multicast that provides a probabilistic guarantee for disruption free service. The proposed multicast forecasts the direction and velocity for a mobile host. It is possible that data packets for a mobile host are multicasted to not all neighbor cells but a par\ulcorner of neighbor cells those the mobile host will be handoff potentially on the basis of these information. Therefore, the extended staggered multicast significantly reduces the static network bandwidth usage also provides a probabilistic guarantee for disruption free service.

• The Journal of the Korea Contents Association
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• v.18 no.6
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• pp.374-384
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• 2018

This study examined the effects of clarification training on conversational breakdowns and repair strategies of 3 school aged children with ASD. Clarification training provided to the participants during playing the barrier games. The results found that the occurrence of conversational breakdown was decreased in terms of overall and types. The occurrence and appropriateness rates of repair strategies were increased among all participants. Based on the results, 'clarification training' used in this study can be an effective method to train children with ASD for appropriate repair strategies in conversation.

• Journal of Korea Multimedia Society
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• v.15 no.10
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• pp.1185-1195
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• 2012

In the general recording method of mobile broadcasting, all incoming broadcasting streams after recording time will be saved regardless of its content. In this case, as such that viewers do not want to record, commercial advertisement, are saved together. In order to solve these problems, the proposed method checks if the contents such as advertisements are exist in the target stream by analysing the splicing in incoming MPEG-2 TS streams and, if splicing happened, excludes incoming stream after the splicing in the recording process. In the proposed method, first the splice in the recording stream is verified using the related flags of adaptation field in the TS packet and, if judged to cause a splice, the time of splicing is to be estimated by evaluating the value of splice_countdown filed. In this way, the proposed algorithm provides the seamless recording method by estimating the time of splice and excluding the contents after the splicing. To evaluate the proposed seamless recording method, the simulation was carried out by modifying the software of the existing mobile broadcasting terminal.

• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.138-152
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• 2018

The purpose of this study is to investigate that effect of the social support to individual desire of reemployment and satisfaction to reemployed works of career interrupted women. We surveyed about 400 career interrupted women living in Seoul who quit their job within 3 years, analyzed collected data with empirical analysis, and applied structural equation analysis to verify the assumed model for this study. The results of this study showed that social supports influence career interrupted women's individual desire of reemployment, satisfaction to their work, and self-esteem. And the results also showed that the desire of reemployment performs a parametric role between social supports and satisfaction of reemployment. As a consequence, this study showed importance of social supports to reemployment of career interrupted women and satisfaction to their reemployment, therefore, can be helpful to build public policies to promote social manage of women resources.

• The Journal of the Korea Contents Association
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• v.17 no.9
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• pp.310-323
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• 2017

The purpose of this study is to provide necessary data and information in order to support economic activity of career interrupted woman by analysis the differences between seeking work need on individual characteristic and re-employment need of job-seeking activities. This study includes the result of reviewing a prospective study and an enpinical analysis based on the theoretical background of career interrupted woman, vocational education, individual characteristic and re-employment need to achieve its goal. The collected data from 150 career interrupted women who had a vocational education was analyzed by one-way analysis of variance, T-verification and SPSS 12.0v program. In summary of this study, re-employment need would be different by individual characteristic, seeking work need and job-seeking activities. It shows that the method of re-employment should be provided as considering the individual characteristic of career interrupted woman. Therefore, this study suggests the necessity of suited education and improved system for individual characteristic of career interrupted woman.

• Journal of Korea Society of Industrial Information Systems
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• v.14 no.3
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• pp.50-57
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• 2009

We propose a network node search scheme to address the network fragmentation due to high node mobility in the VANET. VANET is very similar to MANET in that a multi-hop ad-hoc network is configured by wireless communication between vehicles without any network infrastructure. However, high speed mobility, high node density, and frequent topology change induce frequent network fragmentation so that overall network traffic can be increased. In this paper, new broadcasting protocol called an adaptive relay node search protocol is proposed to decrease the network fragmentation. It reduces the network fragmentation and network traffic by researching nodes outside the dangerous area only in case of network fragmentation. Simulation results show that the proposed protocol decreases network fragmentation by up to 39.9% and increase informed rate by up to 41.9% compared to the existing broadcasting protocol.

• The Journal of the Convergence on Culture Technology
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• v.9 no.6
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• pp.779-787
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• 2023

Previous research regarding budget analysis has been mostly limited to describing annual changes in defense budgets relative to total budgets without a theoretical background. More empirical defense budget research is needed with better data. This study conducts an empirical analysis of national defense expenditures using Punctuated Equilibrium Theory (PET). The purpose of this study is to examine trends in the Republic of Korea's (ROK) functional defense budgets (total defense budget, force operation budget, force improvement budget) and to identify and analyze radical points of change in the defense budget using punctuated equilibrium theory. This study also explores trends and punctuations in the national defense budgets using annual defense budget data from the ROK for every year from 1998 to 2017. This study finds that from 1998 to 2017 the spending pattern of the total defense budget in the ROK was characterized by 19 years of stable growth and a one-time punctuation (5.0%). The force operation budget exhibited stable growth in eighteen years and was punctuated twice (10%). The force improvement budget was punctuated five times.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.123-125
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• 2022

외항상선 해기사 수급차질 현황을 진단하고 현 상황 지속 시 해기단절 상황을 추정한 후 해기전승을 위하여 향후 10년간 외항상선해기사 연평균 7,500명 유지, 1항·기사와 2항·기사 이직률 30% 감소, 선·기장과 3항·기사 이직률 10% 감소 및 승무경력단절 해기사 복귀 인원 연 80명의 목표를 제시한 후 이를 달성하기 위한 추진전략 및 추진과제를 제시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.128-130
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• 1999

본 논문에서는 사용자 호스트와이 단절된 상태를 고려한 이동 에이전트 시스템 구현에 대해 논한다. 기존의 이동 에이전트 시스템에서는 사용자의 호스트와 단절 혹은 연결된 상태에서 부여된 태스크의 수행 결과를 사용자에게 전달하는데 있어서 비용이 상당히 많거나 불가능하며, 또한 일방적인 통보 형식이므로 전달한 결과에 대해 동적으로 사용자와 상호 작용할 수 없다. 본 논문에서 제안하는 시스템은 사용자 호스트와의 연결 상태에 상관없이 사용자에게 결과를 전달하고 전달한 결과에 대해 사용자와 동적으로 상호 작용하도록 구현하였다. 시스템은 IBM의 이동 에이전트 시스템인 AWB(Aglets Workbench)를 확장하였으며, 자바 메일 패키지(Java Mail Package)를 이용하여 작업 수행 결과를 사용자의 호스트나 개인 휴대 통신 기기 등을 통해 사용자에게 전다하고 사용자의 호스트가 수행 결과를 사용자의 호스트나 개인 휴대 통신 기기 등을 통해 사용자에게 전달하고 사용자의 호스트가 이동 에이전트 시스템에 재접속하면 결과에 대해 상호 작용할 수 있도록 구현하였다. 이러한 시스템은 단절(disconnection) 상태에서도 수행이 가능한 이동 에이전트의 장점을 보다 더 증가시킨다.

• The KIPS Transactions:PartC
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• v.16C no.4
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• pp.521-526
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• 2009

Disruption/Delay Tolerant Network(DTN) is a technology for interconnecting partitioned networks. These days, DTN, especially routing in DTN, draws significant attention from the networking community. In this paper, we investigate DTN routing strategies for highly partitioned ad hoc networks where Unmanned Aerial Vehicles (UAVs) perform store-carry-forward functionality for improved network connectivity. Also we investigate UAV trajectory control mechanisms via simulation studies.