• The Journal of Information Systems
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• v.24 no.1
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• pp.67-94
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• 2015

Recently, the popularity of Social Network Service (SNS) along with the spread of smart phone, personal computer and tablet PC helps personal network to construct new forms of services in cyberspace. As such, SNS plays a significant role in constructing diverse online networks and there is a growing interest on SNS at societal level. In this vein, the purpose of the research was to find the factors affecting the continuance intention to use social network services. The major findings are summarized as follows. First, "System Quality", "Contents Quality", "Personal Innovativeness", "Self-Efficiency", "Honor Benefit" has significant effects on "Relationship Quality". Yet, "Economic Benefit" is not statistically significant on "Relationship Quality". Second, "Relationship Quality" has a significant effect on "Continuous Usage Intention". Last, our research discovered the relationship between exogenous variables which would serve as valuable inputs in the development of strategic guideline and plan for SNS companies and related services.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.366-368
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• 2012

Network Coding approach to IP tracback was proposed by Sattari et al. [5] in order to reduce number of packets required to trace the source of a single attack scenario. In this paper, we analysis and point out limitations and problems of their proof for benefit of network coding to IP traceback.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.3B
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• pp.240-247
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• 2011

In this paper, we made cost & benefit analyses of both WLAN-based and WiBro-based wireless networks for U-City(Ubiquitous City). We obtained basic data for cost analysis such as the number of network equipments through cell design and cell-coverage analysis. Also we made benefit analysis considering technical features of WLAN and WiBro networks. By cost & benefit analysis, we have reached conclusions that WiBro-based wireless network has earlier BEP(Break-Even Point) and larger NPV(Net Present Value) than WLAN-based network, and that WiBro is more efficient wireless network for U-City.

• 제어로봇시스템학회:학술대회논문집
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• 1997.10a
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• pp.1557-1560
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• 1997

In this paper, we have built an experimental magnetic levitation system for a possible use of control education. We have give a mathermatical model of the nonlinear system and have shown the stability region of the linearized system when it is controlled by a PD controller. We also proposed a neural network control system which uses a neural network as a feedforward controller thgether with a conventional feedback PF controller. We have generated a desired output trajectory, which was designed for the benefit of the generalization of the neural network controller, and trained the desired output trajectory, which was desigend for the benefit of the generalization of the neural netowrk controller, and trained a neural network controller with the data of the actual input and the output of the system obtained by applying the desired output trajectroy. A good tracking performance was observed for both the desired trajectiories used and not used for the neural network training.

• 한국사회정책
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• v.20 no.2
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• pp.195-232
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• 2013

Child care cash benefit policy in Korea started in 2009 limited to the those under 2 years old in the poverty group entitled to National Basic Living Security Act and the near poor group (100,000 won a month). However, in 2013 the coverage has been expanded to everyone under 5 (200,000 won for those between babies in their first year, 150,000 won for the second year and 100,000 won for those between 2 to 5 years old) regardless of the household income level. The policy change between year 2012 and year 2013 requires a rapid increase in child care budget - 760% increase. This paper examines this exceptional expansion in child care cash benefit using policy network analysis. We found that local election as well as general election immediately effect the interaction between policy actors and the types of networks. This suggest that policy actors recognize child care cash benefit to be more directly related to the election result compared with child care services. Also conflictive interaction between the parties and government bodies with budget restraint also facilitated the diversification on the child care cash benefit discussion. The policy making process of child care cash benefit was led to policy adoption immediately after the presidential election suggesting that policy formation process and the policy adoption had an close relationship in the Korean child care cash benefit policy process.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06d
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• pp.285-290
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• 2008

이동통신 서비스를 이용해 인터넷의 콘텐츠를 다운로드 받으면 통신비용이 자료의 양에 비례하여 사용자에게 부과된다. 각 Peer가 콘텐츠의 일부를 3G 채널 등을 이용하여 유료로 다운로드 받고 비용이 부과되지 않는 ad hoc 채널에서 콘텐츠의 나머지 부분을 다른 Peer와 교환하여 전체 콘텐츠를 구성하면 사용자에게 부과되는 비용을 절감할 수 있다. 본 논문은 각 사용자가 가지고 있는 일부의 콘텐츠를 교환하여 전체 콘텐츠를 구성하는 방법인 benefit value를 설명하고, benefit value 값이 변경되지 않아 전송횟수가 증가하는 현상을 benefit bitmap으로 해결할 수 있는 방법을 제안한다. 시뮬레이션 결과에 따르면 1Mbyte 파일을 5개의 Peer가 나누어 다운로드 받아 패킷을 512 byte와 1024 byte 크기로 교환했을 때, benefit bitmap을 사용하면 benefit value와 비교해 패킷 송신을 위한 버퍼의 크기가 100인 경우 약 22%, 버퍼가 3000인 경우 약 10% 정도 전송시간을 단축할 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.10
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• pp.684-690
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• 2014

In this work we investigate the benefit of multicast in the delivery of video data over the mobile MBMS network. In order to quantify the benefit in a practical aspect, this work proposes an analytic framework that employs a combined statistical and queuing model, where a queuing model represents the behavior of user's access to the video service and the statistical model captures the popularity of the video contents, via which we draw out a more realistic intuition for the expected benefit from multicast. Finally, we present results of numerical experiment that illustrates the validity of the proposed work.

• International conference on construction engineering and project management
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• 2005.10a
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• pp.780-785
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• 2005

This paper aims to consider an overall benefit-duration optimization (OBDO) problem for the sake of maximizing owner's economic benefits, whilst considering influences of schedule compression incurred opportunity income on the profitability of a large-scale construction project. Unlike previous schedule optimization models and techniques that have focused on project duration or cost minimization, with greater weight on contractors' interests, OBDO facilitates owner's economic benefits through overall benefit-duration optimization. In this paper, the objective function of OBDO model is formulated. An example is illustrated to prove the feasibility and practicability of the overall benefit-duration optimization problem. The significance of employing OBDO model and future research work are also described.

• Management Science and Financial Engineering
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• v.16 no.3
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• pp.85-93
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• 2010

Given an undirected network with a set of source-sink pairs, we are assumed to get a benefit if a pair of source and sink nodes are connected. The k-edge survivability of a network is defined as the total benefit secured after arbitrarily selected k edges are destroyed. The problem of computing k-edge survivability is known to be NP-hard and has applications of evaluating the survivability or vulnerability of a network. In this paper, we consider the k-edge survivability problem restricted to ring networks and develop an algorithm to solve it in O($n^3$|K|) time where n is the number of nodes and K is the set of source-sink pairs.

• Proceedings of the IEEK Conference
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• summer
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• pp.294-301
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• 2004

This paper presents a combination of optimization concept and congestion control for multicast communications to bring best benefit for the network. For different types of Internet services, there will be different utility functions and so there will be different ways to choose on how to control the congestion, especially for real time multicast traffic. Our proposed algorithm OMCC brings the first implementation experiment of utility-based Multicast Congestion Control. Simulation results show that OMCC brings better network performances in multicast session throughput while it still keeps a certain fairness of unicast and multicast sessions, and thus, provides better benefit for all network participants.