• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.697-699
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• 2004

오늘날 무선 통신 기술의 급속한 발전과 이동 단말의 소형화, 고성능화가 실현됨에 따라 이동 중 데이터 통신이 가능하도록 하기 위해서는 이동 단말의 이동성을 효율적으로 관리하는 것이 매우 중요하다. 본 논문에서는 IETF에서 개발한 Mobile IPv6를 기반으로 지역적 이동성 기능을 제공하기 위하여 이동 노드의 기능을 강화한 방안을 구현하고 실측을 통하여 성능을 분석하였다. 본 논문에서 구현한 방안은 이동 단말이 외부 도메인 내에서 핸드오프 시 바인딩 메시지를 지역 내에서 처리하여 자신의 위치를 갱신하는 시간을 감소시킴으로써 Mobile IPv6보다 패킷 손실을 줄이고 TCP 처리율을 높임을 알 수 있었다.

• Electronics and Telecommunications Trends
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• v.17 no.6 s.78
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• pp.99-107
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• 2002

이동전화시장에 대한 규제여부를 논의할 때 가장 중요한 요인으로 이동전화시장의 경쟁상황을 들고 있다. 대부분의 이동망 비규제를 주장하는 측의 논리는 이동전화시장은 복수사업자체제로 치열한 경쟁이 전개되고 있기 때문에 고정망에서와 같은 강력한 규제가 대칭적으로 적용되어서는 안된다는 점을 강조하고 있다. 본 고에서는 이러한 주장의 타당성을 검토하고 합리적인 이동망 시장 규제대안을 모색해보기 위해서 이동전화 시장구조를 살펴보고 세분화된 이동전화 시장 내에서의 경쟁상황을 검토하였다. 아울러 본 고에서는 이러한 분석을 바탕으로 세분화된 이동전화 시장상황에 적합한 정책 및 규제 대안을 제안하였다.

• Information and Communications Magazine
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• v.20 no.5
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• pp.595-607
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• 2003

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.157-165
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• 2016

Among high-tech products, the mobile phone has experienced a rapid rate of innovation and a shortening of its product life cycle. The shortened product life cycle poses major challenges to those involved in the creation of forecasting methods fundamental to strategic management and planning systems. This study examined whether the best model applies to the entire diffusion life span of a mobile phone. Mobile phone sales data from a specific mobile service provider in Korea from March of 2013 to August of 2014 were analyzed to compare the performance of two S-shaped diffusion models and two non-linear regression models, the Gompertz, logistic, Michaelis-Menten, and logarithmic models. The experimental results indicated that the logistic model outperforms the other three models over the fitted region of the diffusion. For forecasting, the logistic model outperformed the Gompertz model for the period prior to diffusion saturation, whereas the Gompertz model was superior after saturation approaches. This analysis may help those estimate the potential mobile phone market size and perform inventory and order management of mobile phones.

• Journal of Distribution Research
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• v.11 no.4
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• pp.31-48
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• 2006

This study was motivated by a recent channel conflict on subsidies for mobile handset between a service provider and a handset manufacturer in the mobile communication market. In this study, we have developed a two-person non-zero sum game for the channel conflict on subsidies for mobile handset, and derived its optimal strategic game solution. As a result, we have found that, between the service operator and the handset manufacturer, one who has high level of market leadership in his own market has a power to affect the optimal strategic game solution. We have also found that, when the service operator and the handset manufacturer have relatively high level of market leadership in their own market, there exist both of potential channel conflict and cooperation. The result of this study may provide an effective reference for a solution of similar channel conflicts.

• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.221-227
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• 2010

This research dealt with the psychological structure where customers get attached to mobile telecommunication service. As a result, first, product group innovativeness had a meaningful influence on the customers' having trust and positive affects in mobile telecommunication service. Second, when the trust of the customers using mobile telecommunication service was high, the affection towards the service was proportionately positive. Third, although the affection of love was strong when the customers highly trusted the mobile telecommunication service he is using, it did not have a meaningful influence on the attachment of relationship. Fourth, when the customers gained a positive affection towards the mobile telecommunication service, the attachment of love and relationship was stronger. These research results mean that the effects which customers' mobile telecommunication innovativeness have should be considered importantly as a factor of influence on customers' service attachment.

• The Journal of Society for e-Business Studies
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• v.17 no.2
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• pp.63-72
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• 2012

The Korean telecommunications market has been expanding swiftly, these days, to be saturated. In this environment, the upcoming mobile telecommunication market, where 4G service was introduced this year, is becoming more substitutive and competitive. Thus, the demand forecasting of 4G service is very difficult, while it is critical to market success. This paper adopts a multi-generation diffusion model to capture the diffusion and substitution patterns for two successive generation of technological services, i.e., 3G and 4G mobile telecommunications services. The three parameters, i.e., the coefficient of innovation, the coefficient of imitation, and the coefficient of market potential, used in the multi-generation diffusion model based on Norton and Bass[11] are obtained by inference from similar substitutive relations between older and newer telecommunication services to 3G and 4G services. The simulation results show that the Bass type multi-generation model can be successfully applied to the demand forecasting of newly introduced 4G mobile telecommunication service.

• The Journal of Society for e-Business Studies
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• v.17 no.2
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• pp.115-127
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• 2012

The diffusion of the mobile telecommunication service in a country could be affected by the diffusions of the services in her neighbor countries. Previous studies on the diffusions of the telecommunication service among countries have been mainly focussed on the comparison after individual diffusion estimation. However, it would be natural to think the diffusion of the mobile telecommunication service in one country could affect to and be affected by the diffusion of the mobile telecommunication service in her neighbor country. In this study, we have applied the multinational diffusion model to model the crossnational effect in the diffusion of the mobile communication service in China, Korea, U.S., Japan, and Hong Kong. Among these 5 countries China is the latest country to adopt the mobile communication service, and we were interested in whether the diffusion of the mobile communication service in Korea, U.S., Japan, or Hong Kong has affected the diffusion of the mobile communication service in China or not. In our application result, the diffusion of the mobile communication service in China has been affected significantly by those in all of the 4 neighbor countries.

• The KIPS Transactions:PartA
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• v.14A no.6
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• pp.333-340
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• 2007

In multi agent systems, various inter agent communication models have been proposed, and, especially, there are several group communication schemes proposed so far, where some schemes guarantees transparent communication among the agents. However, in mobile agent environments, we require new group communication schemes that consider topology changes caused by mobile agent migrations. Also, these group communication schemes should be secure in order for them to be practical. In this paper, we propose a secure group communication scheme using the hierarchical overlay ring structure of mobile agents. The proposed scheme uses the ring channel in order to cope adaptively with the change of ring topology. The ring channel has basic information for construction of the ring and is managed only by the mobile agent platforms. Therefore, each mobile agent need not directly handle the ring channel and it can perform group communication without any consideration on the change of the ring topology.

• Journal of Internet Computing and Services
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• v.18 no.2
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• pp.113-121
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• 2017

As the industrial structure of the mobile telecommunications market is transforming into the ICT ecosystem centered on smartphones, the regulatory system conforming to the new ICT environment has become the main subject of discussion in key developed countries. The EU segmented the mobile phone service into wholesale and retail. Simultaneously, the EU appraised mobile telecommunication carriers' market domination in segmented markets to continuously improve the scheme to promote competition in the telecommunications market. In Korea, also, there is discussion about adopting the EU scheme to segment the mobile phone market definition more finely and taking measures to appraise the market domination in accordance with object appraisal criteria. As such, this study analyzes whether the current criteria for appraising the wholesale termination rate market domination under the ICT's domestic mobile telecommunication ecosystem is adequate and presents the rational improvement measures reflecting the theoretically suggested evaluation factors.