• The KIPS Transactions:PartD
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• v.11D no.7 s.96
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• pp.1483-1490
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• 2004

To accomplish a project successfuly, we have to estimate develpment effort accurately. But, development effort is different to software size and operation environment. Usually, we made use of function point for estimating development effort. In this paper. we make use of 789 project data. It is related to development projects in 1990`s. We investigate the variable affecting development effort. Also, we exedcute multiple liner regression analysis for looking linear relation about variables. We find the regression equation for multistage by dividing PDR that influ-enced development effort step by step.

• Korean Journal of Remote Sensing
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• v.18 no.2
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• pp.71-79
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• 2002

This research presents particulate distribution map of tidal flats of Hampyung bay using reflectance which extracted from satellite data and field survey data during same periods. The spectrum of particulate composition obtained from Landsat TM data was analysed and 7 scenes of satellite image were classified with ISODATA and K-MEANS methods. The results of unsupervised classification were estimated with in-situ data. The classification accuracy of ISODATA and K-MAMS methods were 84.3% and 85.7%. For validation of classified results of multi-temporal satellite images, TM image of May 1999(reference data), which was classified with field survey data was compared with classified results of multi-temporary satellite data.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.627-630
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• 2001

본 연구에서는 MPEG 시스템의 동기화 방식에 대해 조사하고, 이를 바탕으로 특정 어플리케이션 개발에 적용 할 오디오/비디오 동기화 시스템을 구현하고자 한다. 먼저 비디오 신호와 오디오 신호를 각각 MPEG-1 시스템의 비디오 압축 방식과 G.722 팡대역 음성 부호화 방식을 이용하여 부호화하고, 부호화된 두 미디어간의 동기화를 위해 시간 정보를 삽입하여 최종적으로 하나의 비트스트림으로 다중화 하고, 다중화된 비트스트림으로부터 오디오/비디오 신호를 각각 분리하여 재생할 수 있음을 보였다.

• Electronics and Telecommunications Trends
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• v.11 no.1 s.39
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• pp.29-47
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• 1996

본 고는 전자통신시스템 및 단말기의 소형화 및 고기능화를 위하여 대두되고 있는 다중칩 모듈(Multichip Module; MCM)중 Laminate기술을 기본으로 하며 대량생산이 가능한 Multichip Module-Laminate(MCM-L)기술에 대하여 논하고 있다. 본 내용에는 전기 및 열특성을 결정하는 기판재료, Laminate에서의 Via 및 Pad의 한계, MCM의 성능과 관련된 시험방법 등이 있으며, 마지막으로, 통신 및 타분야의 MCM 응용사례를 조사분석하고 향후 MCM의 기술발전방향을 예측해 보았다.

• Journal for History of Mathematics
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• v.18 no.4
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• pp.125-134
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• 2005

In this paper we introduce the historical development of the theories for the planar domains. Also we deal with the representative domains of the planar domains and study the properties of the new representative domains.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.11
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• pp.911-918
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• 2014

In this paper, a selective activation strategy of cohesive elements using user subroutine UMPC was studied as an efficient solution for the added compliance problem in cohesive zone model crack propagation analyses. The cohesive elements were inserted between every bulk elements in region where cracks were expected to initiate and propagate, but initially not activated by tying the cohesive nodes using multi-point constraints. During analyses, the cohesive elements for which specified criterion was met were selectively activated by releasing the constraints. The effect of initial cohesive stiffness and the release criterion on the crack propagation behavior was carefully investigated.

• The Korean Journal of Applied Statistics
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• v.26 no.4
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• pp.635-647
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• 2013

Imputation is a commonly used method to handle missing survey data. The performance of the imputation method is influenced by various factors, especially an outlier. The removal of the outlier in a data set is a simple and effective approach to reduce the effect of an outlier. In this paper in order to improve the precision of multiple imputation, we study a imputation method which reduces the effect of outlier using various weight adjustment methods that include the removal of an outlier method. The regression method in PROC/MI in SAS is used for multiple imputation and the obtained final adjusted weight is used as a weight variable to obtain the imputed values. Simulation studies compared the performance of various weight adjustment methods and Monthly Labor Statistic data is used for real data analysis.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.171-172
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• 2013

우울은 군대 내 발생되는 극단적인 사고 중 하나인 자살의 주요 원인으로 제시되어 왔다. 본 연구는 군인들의 우울, 불안 및 자아존중감의 수준을 파악하고, 우울의 영향요인을 탐색하고 이들을 예측하는데 주로 사용해 왔던 다중회귀분석 방법과 효과적인 의사결정방법으로 알려진 회귀나무모형의 효과성을 비교해보고자 하였다. 방법: 횡단적 조사연구이며, 우울측정에는 CES-D, 불안측정은 SAI, 자아존중감은 Rosenberg(1965)의 도구를 사용하였다. 연구대상자는 강원도 전방 부대 근무 중인 군인이며, 534부가 회수되었다. SPSS/WIN 18.0을 이용하여 위계적 다중회귀분석과 회귀나무모형을 실시하였다. 결과: 대상자들의 우울, 불안 및 자아존중감의 정도는 각각 $10.7({\pm}9.8)$, $38.5({\pm}10.2)$과 $31.7({\pm}5.2)$이었다. 대상자의 23.6%(126명)가 경한 우울을 나타내었다. 다중회귀분석에 의한 우울 영향요인은 불안, 자아존중감과 복무기간이었으며, 우울에 대하여 62.0%의 설명력을 가지고 있었다. 또한 회귀나무모형에서는 높은 불안과 불안이 다소 낮더라도 전역 후 진로가 불확실한 집단이 우울 위험군일 것으로 예측되었다. 결론: 본 연구 대상자들의 우울의 주요 영향요인은 불안으로 나타났다. 군대 내에서 적용할 수 있는 불안 조절 방법 개발이 필요할 것으로 보인다. 또한 일부 요인에서 차이가 있어, 반복 연구가 필요하지만, 주요 변인인 불안을 예측했다는 점에서 보면 다중회귀분석과 회귀나무모형은 군인들의 우울을 예측에 유용한 방법으로 보인다.

• Spatial Information Research
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• v.17 no.3
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• pp.351-359
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• 2009

Nowadays, a precision multiple-beam epoch sounder is a depth-sounding apparatus, which is widely used especially for the mapping of bottom of the sea in the coastal area and the bed of river. However, there has been no attempt to verify the accuracy of the depth-sounding apparatus with the data obtained through the actual measurement. As a consequence, the efficient and systematic evaluation of the survey results cannot be performed. In this paper, the accuracy of the multiple beam echo sounder is analyzed by comparing the in-situ measurements and reference data. The test results show that the highest level of accuracy, indicated by IHO, can be achieved even though the magnitude of error increases with the depth of water.

• The Journal of Natural Sciences
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• v.18 no.1
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• pp.1-8
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• 2007

An efficient sampling method of computer simulation is reviewed. Using the method, several thermodynamic states can be investigated at a time in a single simulation. It is due to the ability of the method to explore the relevant parts of configuration space equally for every state being investigated. The method can be used in simulations of complex systems such as biopolymers which are still greatly hampered by the multi-minima problem. In this article I present a brief theoretical review of the method and illustrate how to realize it in the simulations.