• Asia pacific journal of information systems
• /
• 제16권3호
• /
• pp.229-241
• /
• 2006

In this paper, we develop three stage non-cooperative game models to analyze the alliance strategies of companies in internet markets where network effects are present. Regardless of its market share, an internet company's strategic alliance appears to be a superior strategy. The analysis also identifies profit sharing structures in the internet market where a smaller and unknown company is enforced to split its own profits with a larger and well-known company. It is shown that the amount of profit sharing grows as the size of network effects becomes larger.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제5권4호
• /
• pp.626-648
• /
• 2011

Energy consumption of wireless access networks is in permanent increase, which necessitates development of more energy-efficient network management approaches. Such management schemes must result with adaptation of network energy consumption in accordance with daily variations in user activity. In this paper, we consider possible energy savings of wireless local area networks (WLANs) through development of a few integer linear programming (ILP) models. Effectiveness of ILP models providing energy-efficient management of network resources have been tested on several WLAN instances of different sizes. To cope with the problem of high computational time characteristic for some ILP models, we further develop several heuristic algorithms that are based on greedy methods and local search. Although heuristics obtains somewhat higher results of energy consumption in comparison with the ones of corresponding ILP models, heuristic algorithms ensures minimization of network energy consumption in an amount of time that is acceptable for practical implementations. This confirms that network management algorithms will play a significant role in practical realization of future energy-efficient network management systems.

• 응용통계연구
• /
• 제24권2호
• /
• pp.307-313
• /
• 2011

본 연구에서는 인터넷 트래픽 자료를 예측하는데 사용되는 Holt-Winters, FARIMA, AR-GARCH 모형을 트래픽 예측에 적용하여 각 모형을 성능을 비교하고자 한다. 각 시계열 모형에 대해 소개하고, 트래픽 자료의 특성인 장기기억 특성을 설명하는데 적합한 모형을 알아보기 위해 실제 트래픽 자료에 적용하여 예측 성능을 비교하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제11권5호
• /
• pp.2453-2467
• /
• 2017

Wireless communication is a telecommunication technology, which enables wireless transmission between the portable devices to provide wireless access in all types of environments. In this research, the measurements and various empirical models are analysed and compared in order to find out a suitable propagation model to provide guidelines for cell planning of wireless communication systems. The measured data was taken in urban region with low vegetation and some trees at 900 MHz frequency band. Path loss models are useful planning tools, which permit the designers of cellular communication to obtain optimal levels for the base station deployment and meeting the expected service level requirements. Outcomes show that these empirical models tend to overestimate the propagation loss. As one of the key outputs, it was observed that the calculations of Weissberger model fit with the measured data in urban environment.

• 한국통신학회논문지
• /
• 제37권3B호
• /
• pp.212-218
• /
• 2012

인터넷 웜은 컴퓨터 네트워크를 이용하여 자기 자신을 자동으로 복제해서 전파하는 프로그램이다. 컴퓨터간의 네트워크 연결이 증가함에 따라 인터넷 웜은 급격해 확산되었고 큰 위협으로 남아있다. 코드 레드, 님다, 슬레머 같은 인터넷 웜의 특성과 이들의 활동을 억제하는 방법을 찾기 위해서 웜이 전파되는 특성을 연구하려는 많은 시도가 있었다. 네트워크 특징들이 인터넷 웜 전파에 미치는 영향은 모델의 간단성과 유사성 때문에 주로 의학계에서 사용되는 전염병 전파 모델을 이용하여 모델링이 되었다. 이런 의학계 모델링은 널리 사용되면서 여러 개선된 모델들이 다양하게 제안되었다. 우리는 이전의 제안된 모델들의 문제점을 분석한 후 통계적 방법을 사용하여 정확도를 높이는 새로운 방법의 웜 전파 모델링을 제안한다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1998년도 추계종합학술대회 논문집
• /
• pp.23-26
• /
• 1998

IP multicasting efficiently delivers a single datagram to multiple hosts. Its benefits have been demonstrated over the past six years on MBONE. Now, as the number of subnets in the MBONE are increased, the MBONE can no longer be managed as a single, flat routing domain. Its routing scalability must be improved. In this paper, to solve problem of routing scalability, serveral new multicast models for the internet are explained.

• 정보학연구
• /
• 제4권3호
• /
• pp.125-138
• /
• 2001

B2B전자시장에서의 비즈니스 모델은 매우 다양하고, 자료이동에 이용되는 통신망에 따라서도 구분되기도 한다. 또한 내부의 조직적인 자료 통신망은 전자시장에서의 구매자-판매자 관계에 대해 대조적인 영향을 미친다. 통신망은 구매자와 판매자사이에 더욱 짧은 거래에 의해 특징화된 전자시장을 조장하기 위해 이용된다. 그러나 상거래 관계를 강화하기 위한 통신망의 사용과 새로운 거래 파트너에 형성하는 비용 증가로 여러 가지 어려움이 많이 있다. 이에 따라 B2B전자시장에 대한 인식의 폭이 매우 높아지고 있음에 따라 본 논문은 B2B전자시장의 이론적인 접근과 논리적 근거들을 바탕으로 B2B전자시장에 적합한 비즈니스 모텔들을 알아보고자 한다.

• Journal of Information Technology Applications and Management
• /
• 제10권1호
• /
• pp.1-17
• /
• 2003

As the increase of internal users, there are many enterprises and organizations that regard the internal as the great ■marketing superhighway■. But the entrance of too many e-Business enterprises and shopping sites makes them to compete each other Consequently many sites are created and disappeared in the cyberspace. Although fascination and speculation surrounds the impact of the e-Business on business models via benefit-based concept, there is little evidence underlying all this speculation. This article provides on such data set. It reports on critical Issues that e-Business enterprises found salient as they browsed through e-Business model infrastructure on the world wide web, internet-based. We gathered domestic e-Business enterprise's kinds of business model during 2000∼2002 via KMAC's (Korea Management Association Consultants) K-WPI and K-WPC. We classified e-Business models as shopping mall, auction, community. value-chain, collaboration, information brokerage, advertising, Internet service, marketing that we had identified from the existing literature on business models. This study translated these models to the e-Business model context and explored their relative salience. The results suggest that e-Business manager need to think more about how they perform on the issues known to affect decision making for designing e-Business models. We offer advice for enhancing the effectiveness of business models.

• 대한인간공학회지
• /
• 제22권1호
• /
• pp.17-29
• /
• 2003

This study was initiated to develop a methodology for devising Korean virtual models for apparel shopping at internet shopping site. The data base for this study was the Korean National Anthropometric Survey in 1997. The subjects were 493 women and 626 men in 20's. The researchers also measured 88 males and females in age 20's to suggest back and front depth proportions which are not available from the survey. The virtual models' figure types were classified by the heights, drop value and bust(chest) girth. It was evaluated whether it is needed to separate figure type with bust(chest) girth. The body sizes of virtual models were suggested for side view model and front view model in 13cm height. Four female virtual models were suggested for front view and side view. Eight male virtual models were suggested for front view and side view. Each virtual model's height, breadth and depth proportions were calculated. Shoulder breadth. Bust(chest) breadth, waist breadth, hip breadth and proportions were calculated for front view model. The bust(chest) depth, waist depth, abdomen depth, hip depth and proportions were calculated for side view model. Height proportions were suggested for female and male virtual models.

• 인터넷정보학회논문지
• /
• 제4권4호
• /
• pp.45-51
• /
• 2003

일반적으로 퍼지객체지향자료모형에서 속성값은 퍼지집합을 표현한다. 만일 퍼지객체지향자료모형에서 속성값을 구간값 퍼지집합으로 표현할 수 있다면, 퍼지객체지향자료모형에서 사용하는 속성값을 더 유연하게 표현하는 것이 가능하다. 퍼지객체지향자료모형의 상속구조에 나타나는 프레임내에 있는 속성값을 구하기 위해 구간값 퍼지집합을 사용하는 우선순위 논리곱연산을 이용하여 계산한다. 이 방법은 속성값의 소속정도가 기존의 퍼지집합이 아닌 구간값 퍼지집합으로 표현하는 지식정보처리분야에서 사용할 수 있다.