• The Optical Journal
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• s.85
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• pp.32-34
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• 2003

디지털카메라의 국내시장은 2003년 60만대, 디지털프린팅 시장은 800억 규모로 예측되고 있다. 현재 디지털 카메라 시장의 성장세는 경기 하강과도 상관 없이 상승곡선을 이어나가고 있는데 디지털 카메라의 성장은 곧 출력을 비롯한 이미징 활용분야의 성장을 의미하며, 향후에도 지속적인 성장발전을 계속 할 것으로 큰 기대를 모으고 있다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.6B
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• pp.543-550
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• 2009

The traditional simple extrapolation type short term quantitative rainfall forecast can not realize the evolution of rainfall generating weather system. To overcome the drawback of the linear extrapolation type rainfall forecasting model, the history of a weather system from sequential weather radar information and a polynomial regression technique were used to generate forecast fileds of x-directional, y-directional velocities and radar reflectivity which considered the nonlinear behavior related to the evolution of weather systems. Results demonstrated that test statistics of forecasts using the developed model is better than that of 2-CAPPI forecast. However there is still a large room to improve the forecast of spatial and temporal evolution of local storms since the model is not based on a fully physical approach but a statistical approach.

• The korean journal of orthodontics
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• v.27 no.3 s.62
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• pp.473-479
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• 1997

This author tried to find if the size of the frontal sinus can be used as a diagnostic aid to predict the manldibular growth pattern in growing Patients in lateral cephalogram utilizing the fact the the frontal sinus completes its growth in earlier stage but the mandible continues to grow until later. At this study, the 228 samples were divided into 3 groups as skeletal Class I, II, III malocclusions and three indicies(ANB, APDI, Wits) were measured which indicate the mandibular body length and the antero-posterior relationship of maxilla and mandible to evaluate their relations with frontal sinus. And results were obtained as followings 1. The size of frontal sinus is highly related to ANB, APDI, Wits and mandilar body length.(p<0.001) 2. the size of the frontal sinus of the Cl III malocclusion group was on the lateral cephalogram larger than Cl I and Cl II group.

• Journal of Korean Society of Transportation
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• v.30 no.5
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• pp.43-59
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• 2012

It is generally assumed about trip distribution estimation model that growth factor model's estimation accuracy is higher than that of other models in short-term and that gravity model's estimation accuracy is higher than that of other models in long-term. For validation of such assumptions, this study compares estimation accuracies of each estimation model using 3year(1988, 1992, 2004) O-D tables from Daegu city. Each estimation model's accuracy were compared by mid-size and large-size zone as well as short-term and long-term target years. The results show that the trip distribution estimation model selection by usual assumption is not always right.

• Journal of Digital Convergence
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• v.16 no.5
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• pp.137-143
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• 2018

Korea's air passenger traffic has been growing steadily. In this paper, we propose a forecasting model of air passenger demand to ascertain the growth trend of air passenger transportation performance in Korea. We conducted a simulation based on System Dynamics with the demand as a dependent variable, and international oil prices, GDP and exchange rates as exogenous variables. The accuracy of the model was verified using MAPE and $R^2$, and the proposed prediction model was verified as an accurate prediction model. As a result of the demand forecast, it is predicted that the air passenger demand in Korea will continue to grow, and the share of low cost carriers will increase sharply. The addition of the Korean transportation performance of foreign carriers in Korea and the transportation performance of Korean passengers due to the alliance of airlines will provide a more accurate forecast of passenger demand.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.129-132
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• 2012

본 연구는 건축물의 초기화재성상의 주요인자인 화재성장율 예측을 위하여, 일본 송산(松山)모델을 사용하여 예측값을 도출한 결과, 화재성장율은 $0.0144t^2$로 나타났다. 또한 이를 실규모실험(ISO-9705)와 FDS 해석값과 비교한 결과, $Q_{peak}$을 고려한다면 신뢰할 수 있다고 판단 할 수 있지만 약100초 이상의 결과에서는 환기인자 등에 관한 변수에 대한 고려가 필요할 것으로 판단된다.

• KDI Journal of Economic Policy
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• v.19 no.3
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• pp.139-194
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• 1997

80년 이후 최근까지의 우리나라 통화정책과 관련하여 세 가지 질문을 던지고 그에 대한 답을 찾고자 하는 것이 본 논문의 목적이다. 첫 번째 질문은, '중간표적으로 이용되어온 M2의 물가와 산출량에 대한 예측력은 어떻게 변하여왔는가' 하는 것이다. 본 논문에서는 Granger인과성 검정과 VAR을 이용한 예측오차분산분해를 통하여 시간의 흐름과 함께 M2의 예측력이 약화되어왔음을 보일 것이다. 두 번째 질문은, '그렇다면 그 원인은 무엇인가' 하는 것이다. 본 논문에서는 통화수요함수의 장기적 안정성에 대한 공적분 검정을 통하여 90년까지의 표본에서 발견되던 안정성에 대한 증거가 96년까지의 표본에서의 사라짐을 보이고, 이같은 통화수요함수의 안정성 상실을 M2의 예측력 약화의 원인인 것으로 해석할 것이다. 본 논문의 마지막 질문은, 'M2타깃팅의 실제 운영이 인플레이션 및 성장률 안정과 일관되게 추진되어 왔는가' 하는 것이다. 본 논문에서는 통화정책의 반응함수 추정을 통하여 80년 이후 우리나라의 통화정책이 기간에 따라 정책목표가 변화되어 왔음을 보일 것이다. 85년 이전에는 인플레이션의 안정이 추구되었으나 86년에서 92년까지의 기간에는 경기부양이 중점적으로 추구되었던 것으로 보이고, 최근에 이르러서는 인플레이션 안정과 성장률 안정이 비교적 균형되게 추구되고 있는 것으로 평가된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.1067-1071
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• 2005

오늘날 기업들이 급격한 환경변화에 능동적으로 대처하고 지속적인 기업의 성장과 발전을 이루기 위해서는 물류유통과 수요예측에 대한 전반적인 이해와 이를 바탕으로 한 전반적인 시스템이 구축되어야한다. 기업의 성장을 위하여 지속적인 물류유통과 수요예측과 결정이 있어야 한다. 또한 이에 대한 공통적인 적용사항을 규칙 기반으로 한 시스템인 설계되어야한다. 그래서 본 논문에서는 규칙을 기반으로 기업의 물류유통/수요예측을 위하여 데이터마이닝 기법을 적용한 검색 기법을 제시하고자 한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.38 no.2
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• pp.161-169
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• 2011

Longitudinal serial cephalometric films in the every second year from fifty girls were used for the analysis of growth pattern of maxillary alveolar bone (MAE). Six parameters regarding MAB height were measured and were compared with stature and chronological age. Descriptive analysis. correlation coefficient test and linear regression analysis were done for the statistical analyses. 1. The height of MAE increased until 14 years although growth velocity was gradually decreased. which was different with stature growth pattern. 2. The correlation coefficients between chronological age and MAB height were high and had no statistical differences with those of stature and MAB height. In addition. the correlation coefficients between chronological age groups within each parameter of MAB were very high. 3. The growth amount of MAB could be predicted using linear regression analysis on the basis of chronological age data. The growth pattern between MAE and statue was quite different because of the growth pattern difference between skeletal and neuronal system. Therefore. growth pattern of Korean MAB must be considered in dental treatment of youth. Also. close relationship between chronological age and MAB height would be useful when clinicians want to predict growth amount of MAE for the dental implant treatment.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.1
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• pp.9-18
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• 2015

Software Reliability Growth Models (SRGMs) are useful for determining the software release date or additional testing efforts by using software failure data. It is not appropriate for a SRGM to apply to all software. And besides a large number of SRGMs have already been proposed to estimate software reliability measures. Therefore selection of an optimal SRGM for use in a particular case has been an important issue. The existing methods for selecting a SRGM use the entire collected failure data. However, initial failure data may not affect the future failure occurrence and, in some cases, it results in the distorted result when evaluating the future failure. In this paper, we suggest a method for selecting a SRGM based on the evaluation goodness-of-fit using partial data. Our approach uses partial data except for inordinately unstable failure data in the entire failure data. We will find a portion of data used to select a SRGM through the comparison between the entire failure data and the partial failure data excluded the initial failure data with respect to the predictive ability of future failures. To justify our approach this paper shows that the predictive ability of future failures using partial data is more accurate than using the entire failure data with the real collected failure data.