• 한국멀티미디어학회논문지
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• 제17권8호
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• pp.988-994
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• 2014

Software Defined Network (SDN) is a new technology in computer network area which enables user to centralize control plane. The security issue is important in computer network to protect system from attackers. SYN flooding attack is one of Distributed Denial of Service attack methods which are popular to degrade availability of targeted service on Internet. There are many methods to protect system from attackers, i.e. firewall and IDS. Even though firewall is designed to protect network system, but it cannot mitigate DDoS attack well because it is not designed to do so. To improve performance of DDOS mitigation we utilize another mechanism by using SDN technology such as OpenFlow and sFlow. The methodology of sFlow to detect attacker is by capturing and sum cumulative traffic from each agent to send to sFlow collector to analyze. When sFlow collector detect some traffics as attacker, OpenFlow controller will modify the rule in OpenFlow table to mitigate attacks by blocking attack traffic. Hence, by combining sum cumulative traffic use sFlow and blocking traffic use OpenFlow we can detect and mitigate SYN flooding attack quickly and cheaply.

• 대한전기학회논문지:전력기술부문A
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• 제53권6호
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• pp.324-333
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• 2004

This paper discusses the development of an educational web-based power flow program for undergraduate students. The interaction between lectures and users can be much enhanced via the web-based programs which result in the student's learning effectiveness on the power flow problem. However the difficulties for developing web-based application programs are that there can be the numerous unspecified users to access the application programs. To overcome the aforementioned multi-users problem and to develope the educational web-based power flow program, we have revised the system architecture, the modeling of application programs, and database which efficiently and effectively manages the complex data sets related to the power flow analysis program. The developed application program is composed of the physical three tiers where the middle tier is logically divided into two kinds of application programs. The divided application programs are interconnected by using the Web-service based on XML (Extended Markup Technology) and HTTP (Hyper Text Transfer Protocol) which make it possible the distributed computing technology Also, this paper describes the method of database modeling to handle effectively when the numerous users change the parameters of the power system to compare the results of the base case.

• 대한전자공학회논문지TC
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• 제41권2호
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• pp.31-40
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• 2004

Diff-Sew는 개별적으로 구분된 다른 트레픽에 대해서 다른 종류의 네트워크 서비스를 제공하기 위한 메카니즘이며 이용자들에게 양질의 서비스를 제공하기 위한 방법을 제시하고 있다. DS는 토큰 버켓 방법을 사용하여 고정된 호스트들에게 제공되기 때문에 이동성을 가지는 서비스나 개별적인 트레픽에 대한 차등적인 서비스를 제공할 방안이 존재하지 않는다 본 논문에서는 트래픽컨테이너(TC)를 위해서 WFQ 방법과 변방 노드들과 경계 라우터들 내부에서 제어가 가능한 AggF(Aggregate Flow)를 모니터링하여 스케쥴링하는 방법을 제시한다. 이 방법은 트래픽 비율(traffic rate)을 유동적으로 제어가 가능하며 대역폭의 효율적인 이용성을 제공하고 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.931-932
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• 2006

This paper proposes a task modeling architecture -.uFlow-.for home service robots that facilitates the developmental process and let developers implement their services with ease and efficiency.

• 융합보안논문지
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• 제7권2호
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• pp.119-128
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• 2007

1999년 인터넷 뱅킹 서비스가 국내에 처음 도입된 이후 다수의 사용자들에게 인터넷 뱅킹 서비스는 없어서는 안 될 중요한 서비스로 자리 매김하게 되었다. 인터넷 사용자에게 편리함을 제공하는 것은 물론 은행 업무의 효율성을 가져다준 인터넷 뱅킹은 그 중요성이 더욱더 커져갈 것이다. 이로 인해 인터넷 뱅킹을 악용하는 사례가 발생하고 있으며, 특히 컴퓨터 해킹을 통해서 불법적 계좌 이체를 하거나 사용자 정보를 도용하는 등 그 피해의 유형 및 규모가 점점 증가하고 있는 추세이다. 본 논문은 인터넷 뱅킹 서비스를 구성하고 있는 전체적인 요소들(Components) 을 분석하고 서비스 흐름(Service Flow)에 따른 해킹 위협을 구조적으로 분석한다. 이를 통하여 현 인터넷 뱅킹 서비스의 근본적인 문제점을 지적하고 인터넷 뱅킹 서비스의 해킹 위협을 최소화하기 위한 방안을 제시하고자 한다.

• 지식경영연구
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• 제19권2호
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• pp.21-45
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• 2018

With the widespread use of smartphones and the development of information technology, an online service called SNS(social network service) has emerged, and as an increasing number of people began to use SNS, extensive research has been conducted on SNS. SNS is an important factor for adolescents who are developing social skills that help them to adapt to the society, and for adults who are stepping into the society. The present study investigates the effects of information search, self-disclosure, interaction, and playfulness, all of which are motivational factors for SNS use, on flow in SNS, and empirically analyzes the degree of these variables influence according to flow in SNS and individual's personal nature(extrovert, introvert). The analysis results showed that information search, self-disclosure, interaction, and playfulness were positively correlated with flow in SNS, and flow in SNS was positively correlated with social skills. The degree of influence varied depending on the individual's personal nature(extrovert, introvert). These findings may provide important insights for researchers studying SNS, SNS managers, and company officials using SNS.

• 한국정보시스템학회지:정보시스템연구
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• 제30권1호
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• pp.1-20
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• 2021

Purpose The purpose of this study is to deduct the motivative factors such as perceived value, trust, innovative resistance and flow from the pervious studies and to examine the effect of the motivative factors in the continued use of convenient payment service. Design/methodology/approach This study made a design of the research model by integrating the factors deducted from the Value-based Adoption Model and the Innovative Resistance Model with the factors deducted from the Flow Theory. Findings Results showed that perceived value had a significant effect on trust and innovative resistance. Moreover, trust had a significant effect on flow and continued use. Finally, innovative resistance and flow had a significant effect on continued use. However, the research model in this study was derived from a behavioral point of view, therefore, this model needs to combine the various factors of related fields.

• 한국콘텐츠학회논문지
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• 제15권5호
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• pp.674-683
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• 2015

재미는 누구나 느끼고 싶어 하는 인간의 기본적 욕구이지만, 교육과 재미를 접목시킨 연구는 스포츠와 게임 분야를 제외하고는 극히 제한적이었다. 따라서 본 연구는 실제 교육 현장에서 나타난 재미에 초점을 두고, 이를 통해 학습효과를 높일 수 있다는 전제 하에서 출발하였다. 특히, 본인의 의사와 상관없이 의무교육으로 이루어지는 교육에서 재미가 더 필요할 것으로 판단하고, 의무적으로 2주간의 직무교육을 받고 있는 사회복무요원을 연구 대상으로 선정하였다. 실제 사회복무요원 직무교육에서 나타난 재미요인이 학습효과에 어떠한 영향을 미치는지를 파악하기 위해 몰입, 학습만족 간의 인과관계를 구조방정식 모형을 통해 증명하였다. 이를 통해 재미와 교육의 접합점을 찾고 재밌는 교육이 학습 효과와 실제 관련이 있는지, 나아가 사회복무요원에 한정하지 않고 모든 비자발적 성향을 지닌 학습자에게 재밌는 교육의 필요성을 강조할 수 있는 기회가 될 것이다.

• ETRI Journal
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• 제24권1호
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• pp.43-55
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• 2002

This paper proposes a flow-based admission control algorithm through an Asynchronous Transfer Mode (ATM) based Multi-Protocol Label Switching (MPLS) network for multiple service class environments of Integrated Service (IntServ) and Differentiated Service (DiffServ). We propose the Integrated Packet Scheduler to accommodate IntServ and Best Effort traffic through the DiffServ-aware MPLS core network. The numerical results of the proposed algorithm achieve reliable delay-bounded Quality of Service (QoS) performance and reduce the blocking probability of high priority service in the DiffServ model. We show the performance behaviors of IntServ traffic negotiated by end users when their packets are delivered through the DiffServ-aware MPLS core network. We also show that ATM shortcut connections are well tuned with guaranteed QoS service. We validate the proposed method by numerical analysis of its performance in such areas as throughput, end-to-end delay and path utilization.

• 대한전기학회논문지:전력기술부문A
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• 제52권10호
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• pp.571-576
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• 2003

XML Web Service based on internet can cause problems on transmission speed and data error. Also system analysis results simulated by several different research groups can hardly have reliability because of error data that come from improperly managed files. In order to solve this problems, algorithm sever using XML Web Service is shared on the internet so widely that various application programs based on basic analysis module with a united IO can be developed. And also XML Dataset DB is interacted with XML Web Service, which prevents propagation of error data. It causes to improve reliabilityon the load flow analysis result and solve the problems on data error or transmission speed that can possibly come from internet.