• Proceedings of the KSME Conference
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• 2001.06b
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• pp.204-209
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• 2001

The more sophisticated patterns of propagation model is presented in this paper, which includes three different source characteristics (spherical, cosine and dipole). The spherical, cosine and dipole radiation characteristics compared, and sound event level and the maximum sound level are calculated by experiment and calculation. It is shown that patterns of propagation have dipole characteristics for low speed range (below about 150Km/h) at electric multiple system. We know that push-pull high speed system has cosine characteristics of noise propagation at low speed range (below about 200Km/h).

• Nuclear Medicine and Molecular Imaging
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• v.43 no.4
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• pp.323-329
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• 2009

Purpose: Radioimmunoassay (RIA) was usually performed by the batch assay. To improve the efficiency of RIA without increase of the cost and time, random assay could be a choice. We investigated the possibility of the random assay using automatic dispenser by assessing the agreement between batch assay and random assay. Materials and Methods: The experiments were performed with four items; Triiodothyronine (T3), free thyroxine (fT4), Prostate specific antigen (PSA), Carcinoembryonic antigen (CEA). In each item, the sera of twenty patients, the standard, and the control samples were used. The measurements were done 4 times with 3 hour time intervals by random assay and batch assay. The coefficient of variation (CV) of the standard samples and patients' data in T3, fT4, PSA, and CEA were assessed. ICC (Intraclass correlation coefficient) and coefficient of correlation were measured to assessing the agreement between two methods. Results: The CVs (%) of T3, fT4, PSA, and CEA measured by batch assay were 3.2$\pm$1.7%, 3.9$\pm$2.1%, 7.1$\pm$6.2%, 11.2$\pm$7.2%. The CVs by random assay were 2.1$\pm$1.7%, 4.8$\pm$3.1%, 3.6$\pm$4.8%, and 7.4$\pm$6.2%. The ICC between the batch assay and random assay were 0.9968 (T3), 0.9973 (fT4), 0.9996 (PSA), and 0.9901 (CEA). The coefficient of correlation between the batch assay and random assay were 0.9924(T3), 0.9974 (fT4), 0.9994 (PSA), and 0.9989 (CEA) (p<0.05). Conclusion: The results of random assay showed strong agreement with the batch assay in a day. These results suggest that random assay using automatic dispenser could be used in radioimmunoassay.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2009.11a
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• pp.135-136
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• 2009

• Proceedings of the Membrane Society of Korea Conference
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• 1997.10a
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• pp.90-93
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• 1997

1. 서론 : 본 연구에서는 수처리용으로 사용되는 PE 중공사 분리막을 HDPE/LP 혼합계의 열유도 상분리법을 이용하여 제조하고 PE의 MPR(Melt Flow Rate), 희석제 함량, 방사조건 등이 중공사 분리막의 물성변화에 미치는 영향을 투수 계수를 중심으로 검토하였다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.225-226
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• 2006

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2002.10a
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• pp.195-199
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• 2002

SAR(Synthetic Aperture Radar) 영상은 경사촬영을 수행하므로 지형의 기복에 따른 영향을 많이 받는다. 따라서 SAR영상을 이용하여 여러 가지 정보들을 추출하여 이용하기 위해서는 전처리 과정으로서 지형의 기복에 따른 여러 가지 왜곡들을 보정해야 한다. 이에 본 연구에서는 RADARSAT SAR 영상을 이용하여 궤도모델링, 정사보정을 수행하고 역산란계수, 국부입사각 계산 등을 통해 지형기복에 따른 방사왜곡보정을 수행하였다.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05d
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• pp.229-234
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• 1996

방사성폐기물 영구처분장과 같은 대규모 지하 원자력시설의 운영중 안전성 평가를 위하여 지하 구조물의 지진 취약도 해석기법을 제안하였다. 지상구조물에 대해 적용되고 있는 Zion 방법을 모체로 하였으며 지하구조물의 특성 및 기술현황을 반영하였다. 지하구조물의 파괴양상은 구조물의 크기 및 형태, 수평 지압의 크기, 암반의 특성 등 많은 요인에 의해 달라진다. 처분동굴의 개념설계 결과에 대한 지진취약도 분석결과 수평지압계수의 영향이 매우 크며, 벽체부 또는 천정부에서의 숏크리트의 압축파괴가 가장 취약한 것으로 밝혀졌다.

• Proceedings of the Membrane Society of Korea Conference
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• 1993.04a
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• pp.36-37
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• 1993

상전이 공정에 의해 제조된 기체분리용 중공사막은 1차적으로 방사원액의 조성과 내.외부응고제의 조성, 중공사 방사조건 그리고 후처리 과정에 의해서 전체적인 구조가 결정되어진다. 특히 기체 분리에 이용되는 Nonprous Membrane의 경우 Dense Skin의 Thickness와 Pinhole의 유무에 따라 투과성과 선택성에 커다란 영향을 미친다. 따라서 최근에는 Dense Skin의 초박막화와 Pinhole이 없는 비대칭막 제조등 폭넓은 연구가 이루어지고 있다. 본 연구에서는 CO$_2$ Gas 분리용 Polyetherimide 중공사막을 제조하여, 중공사막 제조조건과 후처리 조건에 따른 $CO_2/N_2$ Gas의 분리계수를 측정하였다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2010.10a
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• pp.395-396
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• 2010

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.28 no.1
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• pp.93-98
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• 2010

Recently, as digital photogrammetry bas been widely used in various fields including construction, it is also being applied to several industries. It is essential for interior orientation to determine accurate focal length of camera, lens distortion, location of principal point in order to apply high quality digital camera to digital photogrammetry. In this study we conducted interior orientation for zoom lens camera with regular time and zoom factors and analyzed change of radial distortion parameters and location of principal point to evaluate interior orientation stability. As a result, radial distortion parameters($k_1,k_2$) are converged into zero by increasing zoom factors. There are correlation between the change of location of point and zoom factors. The displacement of $x_p$, $y_p$ increase as zoom factors rise high.