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의료기관을 대상으로 한 보건통계조사의 적정표본설계 방법론에 관한 연구
황정남 한국보건통계학회 1987 보건정보통계학회지 Vol.12 No.1
This study contains a detailed description of the sample survey design, estimating techniques by survey method and quality control devices related to medical facilities survey for health statistics. Thus it is a research of the technical structure of undertaking. It is also a result of the result of the research of how the structure of the study were put into place; the inicial purpose and objective, the available target population, the theoritical background of the sampling, the constraints and characteristic of the medical facilities survey, the determination of unit cost for survey, the balancing of contrasting requirements, efforts to optimize the sampling plan including use of new pattern of controlled selection, a scheme for gradual introduction of an increasing number of medical facilities with data validation and basic formal model for the sampling. In the practical sample design abour medical facilities, as with most large-scale sample survey, the designs and sample selection process may be complicated by in complete frame, non-response and measurement problem. However, it may apear unlikely that practically important non sampling bias will result in from the estimation procedure refered in this study This may require futher research on the effect of the hospital sample survey according to various purposes.
황정남,진원배 동국대학교 재료과학연구소 1981 材料科學硏究所 論文集 Vol.1 No.-
本 硏究에서는 對稱 및 非對稱 電荷變換에 대한 Rapp와 Francis의 理論을 유효 이온화 에너지와 충격인자를 사용하여 개량하였으며, 理論式을 Perel 및 C.N. Whang의 實驗結果와 비교해 본 결과 잘 일치함을 알 수 있었다. 대칭 전하 변환과정에서 입자이온의 에너지가 증가함에 따라 단면적이 감소하며, 비대칭 변환과정에서 입사이온의 속도가 증가함에 따라 단면적이 감소한다. A modified Rapp and Francis theory for the symmetric and antisymmetric charge transfer is developed, using an effective ionization potential and modified impact parameter. The theoretical values are in good agreement with experimental results. The σ_10 for Li^++Li decrease with increasing Li^+ ion energy, and the non resonance σ_10 for Li^++Cd shows the expected abiabatic increase with increasing velocity.
이온 공간 전하에 의한 Mylar 박막의 열자격 전류 극대치의 온도 위치 변화
황정남,김현정 연세대학교 교육대학원 1984 연세교육과학 Vol.25 No.-
Thermally stimulated current curves from ion injected mylar film using liquid contact charging method show two peaks at about 350 K (peak A) and 380 K (peak B). Peak A is found to be due to ionic spice charge polarization. Activation energy and escape frequency for peak B is found to be (2.54±0.21) eV and (4.17±0.16)×1032 sec-1, respectively. And TSC intensities are increased with increasing the concentration of ions, while TSC peak temperature are decreased. These results are in good agreement with theoretical values.
다항 회귀 분석을 이용한 3차원 비석 데이터 내 글자 새김 추출법
허의주(Eui-Ju Jeo),최강선(Kang-Sun Choi) 대한전자공학회 2019 전자공학회논문지 Vol.56 No.3
본 논문에서는 다항 회귀 분석을 이용한 3차원 데이터에서의 비석 내 글자 새김 추출법을 제안한다. 비석의 거친 표면 특성으로 인해, 기존의 방법들이 글자 새김 뿐 아니라 많은 잡음이 함께 오검출되는 문제가 있다. 제안하는 방법에서는 이와 같이 검출된 영역을 새김 후보 영역으로 판단하고, 각 영역에 대해 획에 의한 새김인지를 자세히 판별함으로써 잡음 영역을 제거해 나가게 된다. 금석문은 보통 음각으로 새겨져 운하(canal)와 같은 형태를 가지는데, 이러한 운하의 단면 모양은 대칭적인 2차 곡선의 생김새와 유사하다. 따라서 제안하는 방법에서는 각 새김 후보 영역 내 여러 점 위치에서 해당 점을 포함한 단면 모양을 얻고, 이를 다항 회귀 분석을 통해 2차 곡선으로 근사화한 후, 단면과의 RMSE 오차를 계산한다. 이후 새김 후보 영역 내 얻어진 평균 오차가 큰 경우 잡음으로 판단하여, 제거함으로써 정확도가 높은 새김만을 추출하게 된다. 실험을 통해 제안하는 방법이 고르지 않은 거친 표면에서도 금석문을 명확하게 추출함을 보였고, F1 score 성능 비교를 통해 기존에 제안된 방법들보다 평균 22% 우수한 성능을 가지는 것을 확인하였다. In this paper, we propose a method to extract reliefs carved on stone monuments by analyzing 3-D scan data using polynomial regression. Due to the rough surface properties of the monument, conventional methods extract not only reliefs of characters, but also even a lot of noisy dents. The reliefs are usually engraved and shaped like a canal. The cross-sectional shape of this canal can be approximated with a symmetrical quadratic curve. In the proposed method, the regions including reliefs and noises are initially obtained using the conventional methods. The regions are regarded as relief candidate regions. For each candidate region, several cross sections of the region are reconstructed. Then, we evaluate how well the cross section is approximated by a quadratic curve in terms of root mean square error (RMSE). If the average RMSE obtained in the candidate region is large, it is classified as noise and removed. The remaining regions with low average RMSE are extracted as relief. Experimental results show that the proposed method clearly extracts the relief from the uneven rough surface, and the performance of the proposed method is 22% higher than that of the conventional methods in terms of F1 scores.
鄭鴻倍,康勝彦,黃正男 光云大學校 1984 論文集 Vol.13 No.-
In this study,Li? ions are implanted into PET, using small low energy C-W type accelerator in order to investigate trap level, activation energy, escape frequency, and kinetic order for ionic trap in polymers. The TSC curve showed two peaks at about 345K and 375K. An ionic TSC peak occurs at about 375K, and the activation energy, escape frequency for this trap are 2.06 eV and 4.5×?? ??, respectively. Shallow surface traps are found to be created due to ionization during Li? implantation. And the value ΔT?/ΔT is 0.54, which means that the mechanism of ionic trap is 2 nd kinetic order process.