• 경영과학
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• 제26권1호
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• pp.21-35
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• 2009

There is a controversy on Internet pricing, flat-rate vs. usage-based. This study gives a comparative analysis between flat-rate and two-part tariff which is realistic alternative of usage-based pricing. In a basic economic model, two-part tariff based on ISP's cost structure satisfies allocative efficiency and relatively expand the number of subscribers. But the characteristics of Internet service like consumers' uncertainty on cost, measurement cost of traffic and network externality induce increase of cost or decrease of marginal utility. The analysis shows that small impact of these can make flat-rate more efficient.

• 한국음향학회지
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• 제15권1호
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• pp.93-101
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• 1996

본 논문에서는 전화가입자에게 보다 향상된 여러 가지 음성 서비스를 제공하기 위한 음성 처리 시스템을 구현하였다. 음성 신호처리만을 수행하는 전용 보드를 개발하고 하나의 마스터 보드가 여러 장의 DSP(Digital Signal Processing) 보드를 제어하여 음성의 저장과 재생기능을 수행하는 시스템을 다중 보드 구성에 적합한 방식인 VME버스를 사용하여 하드웨어를 구성하였다. 마스터 보드로서는 CPU30 보드를 사용하였고 DSP 보드로는 음성 입출력을 위한 전용 하드웨어인 SPM(Signal Processing Module) 보드를 제작하여 시스템 성능 평가를 하였다.

• 디지털산업정보학회논문지
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• 제5권4호
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• pp.249-262
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• 2009

HSDPA(High Speed Downlink Packet Access) service has begun nationwide network service since the year 2007 and will be leading technology in mobile service technologies in domestic. But the ARPU(Average Revenue Per Use) from HSDPA has not increased, despite of increasing in subscribers with HSDPA service. It's important to understand why the incresing subscriber with hsdp didn't cause the increasing of its usage. The purpose of this study is to examine factors affecting the intention to adopt and to use HSDPA which refer to the new 3.5 generation communication service, and we are to analyze the relation between the two intentions based on previous studies about technology acceptance.

• 기술사
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• 제34권5호
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• pp.69-72
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• 2001

The national 2G-3G roaming is emerging as one of essential and important issues In Korea in connection with the recent granting of 3G licenses. Accustomed to the current seamless coverage and superb quality of 2G networks, many subscribers have very high expectations of an equal or better service provisioning by 3G networks. However, it is very unlikely for 3G operators to successfully build their networks as comprehensive as the current 2G networks in the beginning of network implementation and commercial launch. Therefore,3G operators are seriously considering the national 2G-3G roaming in Korea. In this paper. 1 would like to discuss and present a technical implementation scheme and problems that need to be solved fer successfully realizing the national 2G-3G roaming.

• Journal of Information Technology Applications and Management
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• 제22권4호
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• pp.59-76
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• 2015

The study on Wholesale pricing of MVNO using two way interconnection charge system is rare. This paper considers MVNO possessing its own facilities and subscribers. While previous studies focus on wholesale provision by MNO, this paper employs another approach from existing MVNO model. This paper introduces two way interconnection charge system by recognizing that mobile network interconnection is important to complete the call from MNO to MVNO as well as the call from MVNO to MNO. Also it is interesting to analyze wholesale pricing when there is brand loyalty between MNO and MVNO. This paper analyzes retail pricing and wholesale pricing under duopoly competition and drives social optimal solutions using linear city model.

• 전기학회논문지
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• 제58권5호
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• pp.1035-1040
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• 2009

We propose a new encoder/decoders based on an tune able wavelength converter(TWC) and an arrayed waveguide grating(AWG) router for large capacity optical CDMA networks. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC) and the generalized multi-wavelength Reed-Solomon code(GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.292-295
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• 2008

We propose a PON repeater system which transports multiple PON channels at the same time over the physical limit of the standard E-PON reach. To increase the physical reach up to 60km, we used the O-E-O (optic-electric-optic) signal regeneration on an active remote terminal which is placed between a central office and passive remote nodes. Also, by incorporating the well-established WDM technology to aggregate multiple E-PON channels, we successfully increased the split ratio (the number of subscribers per fiber core) to over 256.

• 전자통신동향분석
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• 제34권3호
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• pp.106-113
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• 2019

Mobile traffic is one of the most important indexes of the growth of the mobile communications market, and it has a close relationship with subscribers' service usage patterns, frequency demand and supply, network management, and information communication policy. The purpose of this paper is to understand mobile data usage in Korea and to suggest the optimal steps for establishing the frequency supply and demand system by researching the traffic trends that reflect the characteristics of radio resources in the mobile communications field. To achieve this goal, attempts were made to increase the possibility of policy use by analyzing and forecasting mobile traffic trends, and to improve the accuracy of the research through the verification of the existing prediction results. The paper ends with a discussion of the necessity of a frequency management system based on data science.

• 정보보호학회논문지
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• 제13권4호
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• pp.109-127
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• 2003

본 논문은 GSM(유럽형 2세대 이동통신) 시스템과 UMTS(유럽형 3세대 이동통신) 시스템 사이의 키 일치 관점에서의 핸드오버를 알아보기 위해 GSM 시스템과 UMTS 시스템의 네트워크 구조를 분석하고, 무선구간에서의 안전한 통신을 위해 필요한 각 시스템의 인증과 키 일치(AKA)과정을 분석하였다. 서비스를 이용하고자 하는 이동통신 가입자가 위치해 있는 시스템에서 인증과 키 일치가 이루어지는 과정을 가능한 여러 가지 경우로 나누어 분석하고, 핸드오버 시 무선 구간에서 안전하게 사용자 데이터를 주고받기 위해 키 일치가 이루어지는 과정을 CS-Domain과 PS-Domain으로 나누어 분석하였다.

• 디지털콘텐츠학회 논문지
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• 제19권4호
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• pp.837-844
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• 2018

최근 클라우드 기술은 물리적인 네트워크를 구축하지 않고, 동적으로 논리적인 네트워크를 구축할 수 있게 만들 수 있다는 특징으로 인해 각광받고 있다. 최근의 클라우드 분야의 연구에도 불구하고, 가입자가 공개적으로 VNF를 이용한 서비스를 제공 받을 수 있는 NFV 환경의 특성으로 공격의 타겟이 될 수 있기 때문에 가짜 VNF에 대한 식별과 개체 간의 통신 암호화에 대한 연구가 필요하다. 따라서 본 논문에서는 가짜 VNF를 탐지하고, VNF 간의 상호 인증을 통해서 통신 구간의 보안성을 향상시킬 수 있는 Virtual PKI를 이용한 보안 메커니즘을 제안한다. 그리고 NFV 환경에서 DDoS 공격에 대한 공격의 탐지율을 향상시키기 위한 다수의 인공지능 알고리즘을 비교 분석함으로써 공격탐지에 효과적인 인공지능 알고리즘을 도출하였다.