• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.349-353
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• 2010

본 연구에서는 통계분석방법 가운데 하나인 의사결정분석방법을 활용하여 소방방재청 국가화재정보시스템의 2007년부터 2009년까지 강원지역에서 발생한 화재발생 데이터를 대상으로 화재발생에 대한 유형을 분석하였다. 이와 같은 분석결과는 체계적이고 효율적인 소방정책을 수립하기 위한 기초 자료로 활용될 수 있을 것으로 사료된다. 변수선정은 NFDS의 변수들 가운데 화재유형분석에 영향을 줄 것으로 판단되는 변수들만을 대상으로 요인변수들을 발화환경, 화재원인, 진화요인 등 3개의 그룹으로 분류하였으며, 목적변수로는 화재피해와 화재건수를 선정하였다. 또한 NFDS의 제공 데이터들 이외에도 분석의 신뢰도와 정확도를 높이고자 통계청에서 제공하는 2007년과 2008년 외부데이터를 포함시켰다. 분석방법은 대분류 차원의 화재유형별 분석을 수행하고자 인명피해, 재산피해, 화재건수 등 3개의 목적변수를 대상으로 변수들의 영향력을 고찰하였다.

• The Korean Journal of Applied Statistics
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• v.34 no.6
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• pp.937-944
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• 2021

The problem of selecting variables is addressed in partial linear regression. Model selection for partial linear models is not easy since it involves nonparametric estimation such as smoothing parameter selection and estimation for linear explanatory variables. In this work, several approaches for variable selection are proposed using a fast forward selection algorithm, least angle regression (LARS). The proposed procedures use t-test, all possible regressions comparisons or stepwise selection process with variables selected by LARS. An example based on real data and a simulation study on the performance of the suggested procedures are presented.

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.1
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• pp.21-29
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• 2003

It is very important to reduce the computational time in estimating the parameters of vision control algorithm for robot's position control in real time. Unfortunately, the batch estimation commonly used requires too murk computational time because it is iteration method. So, the batch estimation has difficulty for robot's position control in real time. On the other hand, the Extended Kalman Filtering(EKF) has many advantages to calculate the parameters of vision system in that it is a simple and efficient recursive procedures. Thus, this study is to develop the EKF algorithm for the robot's vision control in real time. The vision system model used in this study involves six parameters to account for the inner(orientation, focal length etc) and outer (the relative location between robot and camera) parameters of camera. Then, EKF has been first applied to estimate these parameters, and then with these estimated parameters, also to estimate the robot's joint angles used for robot's operation. finally, the practicality of vision control scheme based on the EKF has been experimentally verified by performing the robot's position control.

• Journal of Korea Water Resources Association
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• v.36 no.3 s.134
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• pp.423-436
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• 2003

The objective of this study is to propose an automatic parameter estimation scheme considering runoff components of Tank model. It estimates model parameters by Powell's automatic algorithm based on the runoff component separation of the observed hydrograph by using digital filter method. The selected study areas are the 4 main dam sites on the Han River. The simulated flows are compared with the observed flows depending on whether runoff component consideration or not. As a result, the estimated model parameters from classical Powell's method only can relatively well simulate the time variation of total runoff, but gives poor runoff component simulations. Therefore, it can be concluded that the proposed automatic parameter estimation scheme in this study Is more reliable and objective.

• Informatization Policy
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• v.19 no.3
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• pp.64-93
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• 2012

This paper attempts to empirically verify the theoretical assumption that ICT factors actually affect national economic development. To this end, this study uses a research model, 'balance model of supply-demand', which consists of IT supply, IT demand and IT policy dimensions. Also, this paper employs several socio-economic factors such as 'size of population', 'consumer price increase', 'national transparency', and 'education'as the moderating variables. The result through the panel data analysis finds it statistically relevant to relate the ICT capacity to each country's economic growth. Also, the study finds that moderating variables were highlighted as important elements of national development: these variables actually moderate the ICT capacity's effects on each surveyed nation's economic growth. Finally, this paper suggests policy implications that nations should consider when developing national informatization policies to drive national economic growth.

• Journal of Convergence for Information Technology
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• v.11 no.10
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• pp.250-257
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• 2021

The author tried to verify the mediating effect of the variable, perceived behavioral control, in the relationship between the independent variables(cosmetics-related variables, consumer's preference, advice & inducement), and the dependent variable(purchasing behavior), through AMOS structural equation modeling. As a result of analyzing the mediating effect in the impact relationship between latent variables, it was found that PBC(perceived behavior control) plays a mediating role in the impact relationship between CQ(cosmetics quality) and PB(purchasing behavior). Author found that the higher the quality of cosmetics and the greater the perceived behavior control in domestic cosmetics purchasing behavior, the more likely it will lead to purchasing behavior. In this context, while efforts are being made to improve cosmetic quality, measures to increase perceived behavior control, which can be said to be autonomy in purchasing behavior, should be sought.

• Proceedings of the Korea Society for Simulation Conference
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• 2005.05a
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• pp.45-49
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• 2005

본 연구는 시뮬레이션 반응변수가 입력 인자의 선형 1차식으로 표현된 경우에 인자의 파라미터를 효과적으로 추정하기위해 사용될 수 있는 분산감소기법을 제안하였다. 이 기법은 하나의 실험설계에 공통난수와 대조난수를 동시에 사용하는 Schruben과 Margolin의 방법과 시뮬레이션하는 도중에 얻어지는 통제변수를 활용하는 기법을 결합하는 방법으로 시뮬레이션의 효율성을 개선하고자 하였다. 시뮬레이션 결과 제안된 기법은 주어진 모형의 평균 반응치를 추정한 데는 S-M 기법보다 효과적이었으며 인자의 다른 파라미터를 추정하는 데는 S-M 기법과 비슷한 성과를 보이고 있다. 만일 시뮬레이션 과정에서 반응변수와 상관성이 높은 통제변수들을 선택할 수 있는 경우에는 제안된 기법이 S-M 기법보다 보다 파라미터 추정에 효과적일 것으로 판단된다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.2
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• pp.151-156
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• 2017

Communication performance requirements are described as QoS parameters in multimedia communication Protocols including SCTP. One of the important QoS parameters is the reliability of the transfer. As a QoS parameter, the reliability defines error detection, report and correction mechanisms. Including SCTP, conventional error control mechanisms, however, do not consider the integrated viewpoint of multimedia data. In this paper, I have designed and proposed the multimedia oriented error control method based on multimedia characteristics. The proposed scheme should have the reduction effect of the communication resources such as frame buffer, procesing power and bandwidth as well as satisfy the requirements of users.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.7
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• pp.827-838
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• 1999

멀티미디어 통신에서 통신 성능에 관련된 요구 사항들은 QoS 매개 변수들로서 서술된다. QoS매개 변수들에서 중요한 매개 변수 중의 하나가 전송 신뢰성이다. QoS 매개 변수로서의 신뢰성은 오류 감지, 보고 그리고 정정 기법으로 정의된다. 하지만 기존의 오류 제어 기법들은 멀티미디어 데이타의 통합된 관점을 고려하지 않았다. 그래서 우리는 MEC(multimedia-oriented error control)라고 명명된 오류 제어 기법을 제안하였다. 1 본 논문에서는 MEC기법의 성능을 조사 하였다. 성능평가 결과는 MEC기법이 기존의 오류 제어 기법보다도 낮은 전송지연(lower delay)과 호손율(blocking probability) 을 갖는다는 것을 볼 수 있었다. 결국 제안된 MEC기법은 수송 프로토콜에게 유연성과 높은 성능을 갖도록 해준다.Abstract Communication performance requirements are described as QoS parameters in multimedia communication. One of the important QoS parameters is the reliability of the transfer. As a QoS parameter, the reliability defines error detection, report and correction mechanisms. Conventional error control mechanisms, however, do not consider the integrated viewpoint of multimedia data. So we have proposed the MEC(multimedia-oriented error control). 1 In this paper, we have investigated the performance evaluation of the MEC. The results show that the MEC mechanism provides lower transfer delay and blocking probability than those of the conventional error recovery mechanism. Therefore, the proposed MEC mechanism makes the transport protocol have the flexibility and high performance.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.287-287
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• 2011

동시 계수 도플러 넓어짐 양전자 소멸 분광법으로 n, p형 Cz-Si의 시료에 양성자를 0, 4 MeV 에너지와 조사량의 변화에 의한 결함을 측정하였으며, 고체 구조 특성에 대하여 조사하였다. 양전자와 전자의 쌍소멸로 발생하는 511 keV 감마선 스펙트럼의 수리적 해석 방법인 S-변수와 W-변수를 사용하여, 구조 변화를 측정하였다. 양성자 조사에너지의 세기에 따라 결함이 증가하였으며, 양성자의 조사량의 변화에 대하여는 큰 변화가 없었다.