• Journal of KIISE:Information Networking
• /
• v.31 no.5
• /
• pp.438-449
• /
• 2004

With the growing deployment of network and internet, the importance of security is also increased. But, recent intrusion detection systems which have an important position in security countermeasure can't provide proper analysis and effective defence mechanism. Instead, they have overwhelmed human operator by large volume of intrusion detection alerts. In this paper, we propose an efficient alert analysis system that can produce high level information by analyzing and processing the large volume of alerts and can detect large-scale attacks such as DDoS in early stage. And we have measured processing rate of each elementary module and carried out a scenario-based test in order to analyzing efficiency of our proposed system.

• Journal of KIISE:Computer Systems and Theory
• /
• v.33 no.9
• /
• pp.626-633
• /
• 2006

The wireless sensor networks are sensing, computing and communication infrastructures that allow us to monitor, instrument, observe, and respond to phenomena in the harsh environment. Sensor operating systems that run on tiny sensor nodes are the key to the performance of the distributed computing environment for the wireless sensor networks. Therefore, sensor operating systems should be able to operate efficiently in terms of energy consumption and resource management. In this paper, we present an efficient memory allocation scheme to improve the time and space efficiency of memory management for the sensor operating systems. Our experimental results show that the proposed scheme performs efficiently in both time and space compared with existing memory allocation mechanisms.

• The Journal of Bigdata
• /
• v.4 no.1
• /
• pp.1-10
• /
• 2019

As FTA is spreading, it is becoming more and more necessary to improve the accuracy and reliability of the country of origin information at the domestic trading stage in preparation for the actual surveys expected to surge in the near future. However, there are many problems in collecting and managing information related to origin. It is pointed out that the shortage of export-oriented profits and the incentive for issuance of FTA-related profits, as well as the lack of information on the distribution and management of origin information of domestic manufacturing companies are also pointed out as important causes. In this paper, we propose a method to improve the efficiency of management and circulation of smooth FTA origin (comprehensive) certificate of Korean companies and to improve reliability through manipulation prevention by building prototype of origin information management system based on private block chain Hyperledger. The block chain, called Distributed Ledger or Trusted Internet, provides a technical infrastructure that enables various related companies to distribute origin information with high reliability and immediate distribution in the supply chain, but research on its application is still in the beginning stage.

• Proceedings of the KAIS Fall Conference
• /
• 2012.05a
• /
• pp.100-103
• /
• 2012

본 연구는 복강경 위절제환자의 임상적 건강관리에 영향을 미치는 요인을 규명하고자 시도하였다. 자료수집은 2012년 1월 16일부터 2월 16일까지 수도권 지역의 종합병원 외과에 내원한 환자 201명을 설문 및 면접조사를 하였다. 연구결과로는 첫째, 수행성과 효율성은 유의한 양의 상관관계를 나타내었다(r=0.24, p<.01). 둘째, 건강실천정도는 선정된 변수들에 의해 42.7% 설명되었다. 효율성이 0.25로 가장 영향력이 있는 변수였으며 유의한 것으로 나타났다(p=.02). 이러한 결과를 토대로 복강경 위절제술환자의 건강실천정도를 높이기 위해서는 이전의 건강관련행위 분석과 건강증진 생활양식을 행하였을 때의 성취감을 통해 향상시킬 수 있을 것으로 본다.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1992.04a
• /
• pp.13-18
• /
• 1992

구조물의 동적실험을 통하여 얻은 하중과 거동에 대한 시간기록을 분석하여, 구조계의 동 특성계수들을 추정하는 기법에 대하여 연구하였다. 실험과정 및 해석모형과정의 오차를 고려하기 위하여, 하중기록과 구조거동기록간의 관계를 추계론적 자동회기 및 이동평균모형(Stochastic Auto-Regressive and Moving-Average (ARMAX) Model)음 사용하여 모형화하였다. 미지의 ARMAX 계수행렬들은 순차적 예측오차기법을 사용하여 추정하였으며, 계수추정기법의 효율성을 증진시키기 위하여, Exponential Data Weighting, Global Data Weighting 및 Square Root Estimation 기법을 활용하였다. 다중거동측정계의 예제해석을 통하여 이의 효율성을 분석하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 1999.10c
• /
• pp.664-666
• /
• 1999

Mobile IP 기술에 의해 시간 및 장소의 제한을 받지 않고 사용자가 원격지 또는 이동 중에도 정보를 처리할 수 있는 환경이 제공된다. 패킷 필터링 기술 같은 경우에는 패킷의 출발지, 목적지 주소뿐만 아니라 패킷의 이동 방향도 고려하므로 Mobile IP의 동작이 방해를 받게 될 수가 있다. 이러한 문제점을 해결하기 위해 나온 것이 역 터널링 기법인데 이 경우는 효율성이 떨어지므로 상황에 따라 역 터널링을 수행하는 선택적 역터널링 기법에 나오게 되었다. 효율성을 증진시킨 선택적 역 터널링 기법은 외부 네트워크의 보안 정책에 위배되는 패킷 전송이 이루어질 수도 있으므로 새로운 보안 정책이 절실히 요구된다. 본 논문에서는 선택적 역 터널링시 외부 에이전트가 패킷 필터링 기능을 갖는 기법에 대해 제안한다. 이 기법을 적용함으로써 이동노드가 선택적 역 터널링시 외부 네트워크의 보안 정책에 부합되게 행동할 수 있도록 하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.466-469
• /
• 2017

SI 프로젝트가 대형화되고 장기화 되면서 투입 인력과 구축 비용의 단위가 점점 커짐에 따라서 프로젝트의 복잡성과 위험요소가 증가하고 있다. 이에 따라 프로젝트 수행에 대한 종합적인 점검과 평가로 프로젝트에 대한 신뢰성과 안전성을 증진시키고, 각종 위험 및 역기능을 최소화 할 수 있는 프로젝트 관리에 대한 전문성이 요구되고 있다. PMO(Project Management Office)는 프로젝트의 수행을 일관성 있게 관리하고, 성공적인 완료를 위하여 지원, 감독, 통제 등의 제반 활동을 수행하는 조직이다. PMO의 도입은 사업관리 효율을 향상시키는 방법 중 하나로 인식되고 있는데, 특히 과거 프로젝트의 성공이나 실패에 대한 지식을 효과적으로 전달한다거나, 프로젝트 팀에게 프로젝트 수행과 관련된 지원 서비스를 제공한다는 점에서 효율적인 방법으로 인식 되고 있다. 본 연구에서는 성공적인 SI 프로젝트가 되기 위해서 프로젝트 내에서 PMO의 역할에 대해서 분석 및 연구하였다.

• Journal of Digital Convergence
• /
• v.15 no.6
• /
• pp.457-466
• /
• 2017

The present study is to observe changes of health promoting behaviors of obese women by applying 8 weeks of motion-beat on rhythm exercise program. The effects of the obese women's motion-beat in rhythm exercise were summarized in the following conclusions: For changes in their health promoting behaviors, according to the application of motion-beat to the eight-week rhythm exercise, it was noted that the application of motion-beat was effective in the factor of stress management. Therefore, since the exercise applying motion-beat maximizes fun and interest, it has been developed as a program on sports for all, appropriate and efficient for obese women, and it is expected that positive changes in health promoting behaviors can be suggested as a measure for the facilitation of their continuous participation in the exercise.

• Magazine of the Korea Concrete Institute
• /
• v.6 no.3
• /
• pp.201-214
• /
• 1994

The fracture process zone in concrete is a region ahead of a traction-free crack, in which two major mechanisms, microcracking and bridging, play important roles. The toughness due to bridging is dominant compared to toughness induced by microcracking, so that the bridging is dominani: mechanism governing the fracture process of concrete. Fracture mechanics does work for concrete provided that the fracture process zone is being considered, so that the development of model for the fracture process zone is most important to describe fracture phenomena in concrete. In this paper the bridging zone, which is a part of extended rnacrocrack with stresses transmitted by aggregates in concrete, is modelled by a Dugdale-Barenblatt type model with linear tension-softening curve. Two finite element techniques are shown for the analysis of progressive cracking in concrete based on the discrete crack approach: one with crack element, the other without crack element. The advantage of the technique with crack element is that it dees not need to update the mesh topology to follow the progressive cracking. Numerical results by the techniques are demonstrated.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.13 no.4
• /
• pp.27-37
• /
• 1993

An efficient method to solve the minimum weight design problem for frame structures subjected to stress and displacement constraints is presented. The different cross-sectional shapes are conside red in order to apply engineering design in which usually required custom fabrication. To increase the efficiency of the optimization process, the structural response quantities(nodal forces, displacements) are linearized with respect to cross-sectional properties or their reciprocal, based on first order Taylor series expansion, while cross-sectional dimensions are considered as design variables. Numerical examples are performed and compared with other methods to demonstrate the efficiency and reliability of approximation method for frame structural optimization with different cross-sectional shapes. It is shown that the number of finite element analysis is greatly reduced and it leads to a highly efficient method of optimization of frame structures.