• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.500-503
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• 2008

Vehicular Ad hoc Networks have attracted extensive attentions in recent years for their promises in improving safety and enabling other value-added services. Security and privacy are two integrated issues in the deployment of vehicular networks. Privacy-preserving authentication is a key technique in addressing these two issues. We propose a hash chain based authentication protocol that preserves the user privacy. We show that the our scheme can efficiently authenticate users. Name of Our protocol is

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 춘계종합학술대회
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• pp.605-609
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• 2001

최근 정보화시대의 남한은 유.무선분야의 통신서비스 및 통신인프라에 있어 세계적 수준에 도달한 반면, 북한의 통신인프라는 기본적 전화수요조차 충족하지 못하는 남한의 '70년대와 유사한 낙후된 상황에 있다. 정보통신분문의 남북한 교류.협력은 경제, 사회 모든 분야에서 교류·협력의 중심부문으로서 남북통합의 기본토대를 마련한다는 점에서 매우 중요하다. 따라서 남북한 통합에 대비 통신망 구축을 위한 인프라로서 위성통신망은 망구축이 용이하고, 언제라도_ 남북한 전지역의 서비스가 가능하다는 장점을 가지고 있어 북한지역의 통신인프라구축에 있어 최적의 대안이 될 수 있다.

• Journal of Information Processing Systems
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• 제14권3호
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• pp.645-654
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• 2018

Information and communication technology (ICT) is increasingly recognized as an important driver of economic growth, innovation, employment and productivity and is widely accepted as a main feature of development. During the last couple of decades, ICT sector became the most innovative service sector that affected the living standards of human beings all over the world. In the beginning of the $21^{st}$ century, some of the Asian countries made reforms in the ICT sector and spent an enormous amount for the progress of this sector. On the other hand, developed countries in the European Union (EU) faced different crises which badly affected the dissemination of this sector. Consequently, EU countries lost their hegemony in the field of information technology and resultantly, some of the emerging Asian countries like China, India, and South Korea got supremacy over the EU in this field. Currently, these countries have a strong IT infrastructure, R&D sector, IT research centers working for the development of ICT. Moreover, this paper investigates reasons for the shifting of the balance of digital power from Europe to Asia.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 춘계종합학술대회
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• pp.50-55
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• 2000

그동안 미국은 세계시장경제질서에 있어서 우위를 점해오면서, 탈규제, 민간자율과 공개경쟁을 강조해 왔으며, 이는 표준화활동에 있어서도 다양하고 통합되지 않은 표준화체계로 이어졌다. 그러나, 1990년대 이후 WTO 무역장벽협정(TBT)의 체결로 국제표준의 위상이 강화되고, 세계정보통신시장에서 선도적 표준화 활동이 국가경쟁력 우위로 이어진다는 인식이 확산되었으며, 특히 EU의 통합과정에서 EU공동체간의 단일화된 기술규격의 제정과 이의 WTO를 통한 제외국에의 강요로부터 미국의 경제상 타격이 계속되자 기존의 민간중심 표준화활동에 정부지원의 필요성을 느끼게 되었다. 따라서 미국은 국내뿐만 아니라, 국제사회에서의 우위를 계속하여 유지하기 위한 하나의 방법으로 표준화활동의 강화 특히 정부의 표준화활동 지원을 통한 국가차원의 접근에 중점을 두게 되었다. 이에 따라 1996년 2개의 법률이 개정되었는데, 그 하나가 연방 전기통신법(Telecommunication Act of 1996)이고, 다른 하나는 NRC(National Research Council)의 1995년 보고서 "Standards, Conformity Assessment, and Trade into the 21 Century"에 따라 개정된 NTTAA(National Technology Transfer and Advancement Act)이다. 본고에서는 미국의 표준화활동의 제도적 기반으로서 이상의 법률 기타 이들의 실행계획을 검토하고 우리나라 정보통신 표준화에 있어서 정부의 적극적 제도적 정비의 필요성을 제언하고자 한다. 제언하고자 한다.

• 대한임베디드공학회논문지
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• 제3권4호
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• pp.218-228
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• 2008

The convergence of broadcasting and telecommunication services is being accelerated by broadband networks, digital broadcasting and Web2.0. This paper describes the definition and service characteristics of IPTV as a representative of broadcasting and telecommunication convergence services. Especially, the changes of infrastructure and technology for IPTV2.0 are addressed in terms of the service features of mobility, intelligence and participation. IPTV2.0 shall be characterized by the open IPTV service based on Web2.0 and the mobile IPTV service over the heterogeneous networks employing various wireless/wired access technologies. The IP Multimedia Subsystem (IMS) and Service Delivery Platform (SDP) technologies are increasingly considered to support the personalization and openness. The mobility management technology is being evolved to provide QoS-guaranteed mobile communication services to users at anytime and anywhere. IPTV2.0 services and platforms are also anticipated to be core components to achieve knowledge-based ubiquitous society. IPTV2.0 contents are required to be integrated with the enhanced metadata to efficiently support search, selection, convergence and delivery of the contents. Moreover, those contents shall be enhanced to provide the scalable services which is adaptable to the network status and user preferences. Therefore, the networking technologies for IPTV2.0 should tightly cooperate with application services and adaptive contents. Those technologies will be developed to construct the ubiquitous content service platform considering the evolution of networks and various converged services.

• International Journal of Internet, Broadcasting and Communication
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• 제9권2호
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• pp.1-10
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• 2017

The high costs of electric vehicle supply equipment (EVSE) and installation are currently a stumbling block to the proliferation of electric vehicles (EVs). The cost-effective solutions are needed to support the expansion of charging infrastructure. In this paper, we develope EV charging system based on the big data analysis of the power consumption patterns. The developed EV charging system is consisted of the smart EV outlet, gateways, powergates, the big data management system, and mobile applications. The smart EV outlet is designed to low costs of equipment and installation by replacing the existing 220V outlet. We can connect the smart EV outlet to household appliances. Z-wave technology is used in the smart EV outlet to provide the EV power usage to users using Apps. The smart EV outlet provides 220V EV charging and therefore, we can restore vehicle driving range during overnight and work hours.

• Journal of Information Technology Applications and Management
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• 제22권3호
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• pp.115-128
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• 2015

Although the telecommunications service industry has become a basic infrastructure component of the information and communication technology (ICT) industry, it is now losing its reputation as a cash cow due to achieving a saturation of service subscribers, especially in South Korea. With the exception of improving network speeds, network operators are experiencing difficulties in creating new innovations. Therefore, new innovations for the telecommunications service industry should be identified in conjunction with government policies for industry promotion. To examine the innovative capabilities of a specific industry, innovation system theories were used as a framework for research. However, existing innovation systems are limited with regard to explaining the openness of relationships and user participation which are general properties of the ICT industry. Moreover, as sources of innovative activity, additional values such as financial support and collaboration are more appropriate. This study presents a new innovation system based on innovation values. We analyze the telecommunications service industry and prioritize the importance of telecommunication policies within South Korea. An in-depth interview with experts based on the innovation system framework is conducted first. Next, innovation factors derived from the interview are applied within an analytic hierarchy process (AHP), leading to a prioritization of innovation factors for the telecommunications service industry.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
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• pp.54-68
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• 1995

In this paper, we develop detailed algorithms for implementing the so-called Limited Column Generation procedure for Local Access Telecommunication Network (LATN) Design problem. We formulate the problem into a tree-partitioning problem with an exponential number of variables. Its linear programming relaxation has all integral vertices, and can be solved by the Limited Column. Generation procedure in just n pivots, where n is the number of nodes in the network. Prior to each pivot, an entering variable is selected by detecting the Locally Most Violated (LMV) reduced cost, which can be obtained by solving a subproblem in pseudo-polynomial time. A critical step in the Limited Column Generation is to find all the LMV reduced costs. As dual variables are updated at each pivot, the reduced costs have to be computed in an on-line fashion. An efficient implementation is developed to execute such a task so that the LATN Design problem can be solved in O(n$^{2}$H), where H is the maximum concentrator capacity. Our computational experiments indicate that our algorithm delivers an outstanding performance. For instance, the LATN Design problem with n = 150 and H = 1000 can be solved in approximately 67 seconds on a SUN SPARC 1000 workstation.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제14권4호
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• pp.295-304
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• 2014

Communication infrastructure supports wide variety of mobile services such as photo and file sharing, location tracking, social network services and instant messaging. However, instances like power-loss and natural disasters disrupt these communication infrastructures unable to render support to these mobile services. Delay-tolerant networks (DTNs) offer a solution to these problems at hand. By utilizing mobility and opportunistic contacts among mobile devices, a plausible communication network can be establish and enable support to mobile applications. This paper presents an energy-efficient, reliable message delivery routing scheme with message prioritization rules for DTN. It uses the context information of nodes (mobile devices) such as the contact history (location and time of contact), speed/velocity, moving direction to determine the best forwarders among nodes in the network. The remaining energy of the nodes is also used to determine the message types a node can deliver successfully. The simulation results show that proposed approach outperforms Epidemic and Prophet routing schemes in terms of delivery ratio, overhead ratio, delivered messages per types and remaining energy.

• 한국문헌정보학회지
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• 제39권1호
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• pp.147-166
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• 2005

이 연구의 목적은 보편적 서비스의 개념과 범위를 재정립하고 남북한 통일과정에서 한국의 보편적 서비스정책 개발을 통해 통일과정에서 남북한의 정보격차를 줄이는 데 있다. 연구의 기본 전제는 잘 발달된 보편적 서비스정책이 통일과정에서 남북한 주민들의 정보자원에 대한 평등한 접근을 가능하게 함으로써 궁극적으로 한반도의 내적(사회 문화적) 통합에 기여할 것이라는 점이다. 이 연구를 위한 개념적 틀은 사회자본(Social Capital) 이론과 혁신 확산(Diffusion of Innovations) 이론이다. 이 연구는 정책분석(Policy Analysis) 기법, 특히 질적 정책분석방법을 사용하고 있으며, 분석의 신뢰성을 높이기 위해 트라이앵귤레이션을 사용하고 있다. 정책분석을 위한 데이터는 정보화 관련 법령, 정책문건, 및 남북한간의 주요 합의문 등이다. 본 연구는 한국의 보편적 서비스의 내용 및 주요 특징을 규명 하고 남북한 사이의 정보통신 정책과 정보통신 기반 구축을 위한 협력에서 상당한 기능성을 보여주고 있으며, 다섯가지 영역에서 정책 제언을 하고 있다: 1) 보편적 서비스범위의 재정립, 2) 남북한의 통합된 정보통신 기반구축, 3) 정책도구의 개발, 4) 정부 조직의 재구성, 5) 남북한 통일을 위한 참여적 보편적 서비스 모델의 창출