• 전기학회논문지P
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• 제60권3호
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• pp.161-166
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• 2011

In this paper, for analysing the major factors giving the effect to the quality of HD level video on the multicasting service, we tried this test experiment on the College school network similar to the real service network environment. We measure the video quality distortion on the multicasting HD level video according to generating and increasing the broadcasting traffic on the situation that apply the QoS technique to the test network and not apply the QoS technique and then find out the threshold value of network factors giving the effect to the video quality distortion on the multicasting HD level video service. This paper can be used for guaranteeing the constant video quality and reducing the video quality distortion on the multicasting HD level video service.

• 한국경영과학회지
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• 제25권1호
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• pp.15-26
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• 2000

We consider an open tandem queueing network with population constraint and constant service times. The total number of customers that may be present in the network can not exceed a given value k. Customers arriving at the queueing network when there are more than k customers are forced to walt in an external queue. The arrival process to the queueing network is assumed to be arbitrary. It is known that the queueing network with population constrant and constant service times can be transformed into a simple network involving only two nodes. In this paper, the departure process from the queueing network is examined using this simple network. An approximation can be calculated with accuracy. Finally, validations against simulation data establish the tightness of these.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 춘계학술대회
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• pp.383-386
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• 2012

본 연구는 관광서비스로서 소셜네트워크 서비스(SNS)에 대한 관광객의 수용결정요인에 대하여 분석하였다. 세부적으로 관광객의 소셜네트워크 서비스에 대한 수용결정요인이 지각된 가치, 만족, 지속적 이용의도 등에 미치는 영향을 분석하였다.

• 한국콘텐츠학회논문지
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• 제8권2호
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• pp.67-73
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• 2008

최근 이동통신의 급격한 발전으로 인해 IP를 기반으로 한 네트워크에서 제공되던 멀티미디어 서비스가 이동단말기에서도 가능케 되고 있다. 셀룰러 망에서는 다양한 멀티미디어 서비스를 제공하기 위해 SIP(Session initiation Protocol)를 호 설정 프로토콜로 사용하는 추세이다. 그러나 높은 비트 에러율, 좁은 대역폭을 사용하는 셀룰러 망에서 기존 SIP RTI(Retransmission Time Interval : 재전송 타임 간격) 값은 오히려 네트워크 성능을 저하시키고 호 설정 시간을 지연시킨다. 본 논문에서는 시뮬레이터 NS-2를 이용하여 셀룰러 망에서의 호 설정 시간을 최소화하는 적합한 SIP RTI 값을 찾아 성능을 향상하였고 그 값을 적용하여 SIP를 이용한 홈 네트워크를 설계, 구현하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.172-175
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• 2003

In this paper we propose a method fur the evaluation of the quality of service for VoIP services in NGN. Specifically, let us anatomize the elements of delay of a voice connection in the network in an end-to-end manner and investigate expected value at each point. We extract the delay time in each element in the network such as gateway, network node, and terminal equipment, and estimate an upper bound fur the tolerable delay in each element.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 춘계학술대회
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• pp.819-822
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• 2012

소셜네트워크 서비스(SNS)에 대한 관광객의 관계 지향성을 조직지식보급, 상호작용수단제공, 핵심서비스 성과, 조직공헌 인지 등으로 분류한 후 이들 요인들이 관계가치, 관계몰입, 충성도 등에 미치는 영향을 분석하였다. 또한 이들 요인들 간의 구조적 관계를 통합적으로 연구하고자 하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(3)
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• pp.189-192
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• 2000

This paper presents a new DR(Dead Reckoning) algorithm in client-server-based networked virtual environment using network delay estimation. In the algorithm, a new update packet is sent to server (or client) whenever the difference of current real value and tracking value after network delay is larger than threshold. To confirm the proposed algorithm, a test network game was implemented. Through iterative field tests, we knew that this algorithm provides fair service and stability.

• 전자통신동향분석
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• 제33권1호
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• pp.111-122
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• 2018

In this review, several new technologies considered when providing an open service environment in a mobile communication network are described. Recently, 3GPP developed some standards related to IoT services for opening a service platform in an SCS environment based on the OSA concept in a 3GPP LTE system. Similarly, the development of a new framework is underway to allow a plurality of services to commonly use an API environment in which a service provider or client accesses a 5G mobile communication system. Extending the existing LTE SCEF concept, the standardization of the northbound API is applied in the 5G CAPIF environment. Therefore, it is possible to construct a framework that facilitates access from outside, and takes advantage of the common management of various open service environments. An open service platform environment is expected to play an important role in transforming a network with simple connectivity services into a variety of new service markets, or into a service environment that can create added value.

• 융합보안논문지
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• 제10권2호
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• pp.51-57
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• 2010

본 논문은 이동 애드혹 네트워크 내에서 발생하는 기본적인 트랜잭션 메시지에 의미를 부여하고 추가적인 트랜잭션 메시지를 정의하며 확신성 요소를 추가하여 보다 나은 서비스를 제공하는 노드 선택의 기준이 될 수 있는 확장된 신뢰도 평가 기법을 제안하고, 이를 시뮬레이션하여 제안한 신뢰도 평가 기법의 효용성을 보인다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1826-1834
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• 2011

The traffic realizes that people come and go. The mobility is on the basis of location and time. The physical means for the traffic is composed of roads, vehicles and fuel. The current traffic services place emphasis on the physical elements. In the near future, with the current elements, the railroad service is considerably improved of through intangible factors including the customized customer services that the mobile-social network service is newly applied. The intangible things are connected to the increase of the time value for customers.