• 제목/요약/키워드: 2-D & 3-D Analyses

검색결과 1,116건 처리시간 0.029초

Optical Design for UVOMPIS and Design Concept of the Mirror Holder

  • Park, Woojin;Chang, Seunghyuk;Pak, Soojong;Han, Jimin;Ahn, Hojae;Lee, Sunwoo;Kim, Geon Hee;Lee, Dae-Hee
    • 천문학회보
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    • 제45권1호
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    • pp.66.3-66.3
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    • 2020
  • We present the optical design of Linear Astigmatism Free - Three Mirror System (LAF-TMS) D200 for UVO-Multiband Polarizing Imager System (UVOMPIS). LAF-TMS D200 is the off-axis wide-field telescope with EPD = 200 mm, F/2, and Field of View (FoV) = 2° × 4°. Its optical mirrors are optimized to freeform surfaces for high-quality optical performance over a wide FoV. The proposed mirror holder consists of four aluminum optomechanical modules that have applied for LAF-TMS D150 which is a prototype of the LAF-TMS system. It can accurately mount mirrors and also can sustain from vibration environments. As a feasibility study, quasi-static, modal, harmonic, and random vibration analyses have been performed to LAF-TMS D150 optomechanical structure under the qualification level of the Soyuz-2/Fregat launch system. We evaluate the vibration analysis results in terms of von Mises stress and Margin of Safety.

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학령전기 아동 발화 단어의 선율 특성 분석 (An Analysis of Tonal Characteristics in Pre-school Children's Word Utterance)

  • 이수연;정현주
    • 말소리와 음성과학
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    • 제7권2호
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    • pp.85-94
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    • 2015
  • This study is to investigate the characteristic of tonal elements in word utterance of 30 pre-school children. For the analyses, 240 utterances of 4 syllable words were processed to extract acoustic values and then the data was transformed into tonal height in order to examine the contour. The results show that the mean pitch of a note is $C4{\frac{1}{2}}(271.17Hz)$ and high and low pitched notes are $C5{\frac{1}{2}}(452.57Hz)$ and $G{\sharp}3{\frac{1}{2}}(192.54Hz)$. The pitch patterns of the 4 syllables measured at the frication and aspiration portion are $E4{\frac{1}{2}}-F4-B3{\frac{1}{2}}-A3$ and F4-E4-B3-A3. The pitch patterns of consonant clusters are $B3{\frac{1}{2}}-D4-B3{\frac{1}{2}}-A3{\frac{1}{2}}$ and $A{\sharp}3{\frac{1}{2}}-C4-A3-D4{\frac{1}{2}}$. The analyses of tonal elements in this study provide evidentiary data on tonal height helpful for developing melodic contour.

Stock Excess Return, R&D intensity and Market Concentration: A Study of IT Firms in India

  • Sahu, Santosh K.;Narayanan, K.
    • Asian Journal of Innovation and Policy
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    • 제4권2호
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    • pp.200-216
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    • 2015
  • This paper empirically investigates the role of R&D intensity on market concentration of firms using four key market valuation variables, namely (1) market share, (2) labor intensity, (3) firm age and, (4) firm's market value. The empirical tests use database at firm level for the Indian IT sector from 1999 to 2013 from the CMIE Prowess database. The results of the regression analyses partially support our hypothesis that R&D intensity positively influences firm's market value measure by the H-index. The test results are consistent with the hypotheses that R&D spending is more valuable for firms with larger market shares, higher labor intensity, and firms that are diversified.

Isolation and Biological Activities of an Alkaloid Compound (3-methylcanthin-5, 6-dione) from Picrasma quassiodes (D. Don) Benn.

  • Yin, Yu;Lee, Seok-Ki;Wang, Myeong-Hyeon
    • Natural Product Sciences
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    • 제17권1호
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    • pp.5-9
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    • 2011
  • An alkaloid, 3-methylcanthin-5, 6-dione, was isolated from the stem of Picrasma quassioides (D. Don) Benn. and characterized by comprehensive analyses of its 1D and 2D NMR spectra. It was also evaluated for its cytotoxic activity in vitro against three human cancer cell lines (MDA-MB-231, HT-29 and NCI-N87), using MTT assays. We found that 3-methylcanthin-5, 6-dione exhibited significant anti-inflammatory activity via inhibiting NO production induced in LPS-stimulated murine macrophage RAW264.7 cells. The antioxidant activity of 3-methylcanthin-5, 6-dione was measured by DPPH free radical scavenging assays, hydroxyl radical scavenging assays and reducing power assays. Our results showed that 3-methylcanthin-5, 6-dione has significant biological activities.

2D 및 3D 디지털 이미지 분석과 함께 Moir$\acute{e}$ Tophography 분석을 이용한 화장품의 가슴 탄력개선 효과 평가 (Assessment of the Breast-Firmming Effects of a Cosmetic Preparation with Moir$\acute{e}$ Tophography in Combination with 2D and 3D Digital Image Analyses)

  • 서영경;유미애;류자현;김소정;조성아;남개원;조준철;부용출;고재숙
    • 대한화장품학회지
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    • 제38권4호
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    • pp.289-296
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    • 2012
  • 외과적으로 가슴의 볼륨 측정은 석고법, 가슴 X선 사진을 이용한 가슴의 볼륨을 산출하는 방법과 MRI, 3차원 측정 시스템 등을 이용한 측정 방법들이 주로 이용되었다. 그러나 최근 화장품 영역에서 가슴 볼륨 증가 및 탄력개선 제품의 증가로 효능평가가 필요하나 외과적 방법들의 적용은 어려운 실정이다. 그리하여 본 연구는 화장품 영역에서 최초로 등고선 사진을 이용하여 가슴 탄력개선을 평가하였다. 또한 가슴둘레 측정, 디지털 이미지 분석, 3차원 가슴이미지 분석 값과의 상관성을 비교하였고 등고선 사진평가를 가슴의 탄력을 평가하는 새로운 방법으로 제안하고자 하였다. 본 연구는 병력조사 및 피부 상태 진단을 통해 건강한 여성 피험자 30명이 시험에 참여하였다. 피험자로 하여금 제품사용 전과 2주, 4주, 8주 후 시점에서 가슴둘레 측정, 유두점의 각도와 거리 분석, Moire's Topography를 이용한 scoring, 3D가슴측정을 실시하여 가슴확대 및 탄력개선 정도를 평가하였다. 평가 결과 디지털 이미지를 분석결과 유두점의 각도(Angle)는 시점별로 증가하는 경향을 보였으나 유의성은 없었다. 유두점으로부터 밑가슴까지의 길이(Length)는 시점별로 유의하게 증가하였다(p < 0.05). 또한, 유두점으로부터 밑가슴까지의 높이는 4주 후, 8주 후 시점에서 통계적으로 유의하게 증가하였다(p < 0.05). Moire's Topography Score 평가 결과 각 시점별로 유의하게 개선하였다(p < 0.05). 3차원 가슴 부피 분석 값은 각 시점별로 증가하는 경향을 보였으나 통계적 유의성은 없었다. 상관성 분석결과 Moir$\acute{e}$ tophography score는 디지털 이미지 분석 값 중 길이, 높이와 유의한 상관성이 있었고 3차원 부피 분석 값과 유의한 상관성이 관찰되었다. 따라서 Moire's Topography Score 평가는 이미지 분석과 3차원 부피분석 평가법과 더불어 화장품에 의한 탄력 및 처짐 개선을 평가하는 데 중요한 평가방법으로 사용될 것으로 사료된다.

Comparison of 3D Volumetric Subtraction Technique and 2D Dynamic Contrast Enhancement Technique in the Evaluation of Contrast Enhancement for Diagnosing Cushing's Disease

  • Park, Yae Won;Kim, Ha Yan;Lee, Ho-Joon;Kim, Se Hoon;Kim, Sun-Ho;Ahn, Sung Soo;Kim, Jinna;Lee, Seung-Koo
    • Investigative Magnetic Resonance Imaging
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    • 제22권2호
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    • pp.102-109
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    • 2018
  • Purpose: The purpose of this study is to compare the performance of the T1 3D subtraction technique and the conventional 2D dynamic contrast enhancement (DCE) technique in diagnosing Cushing's disease. Materials and Methods: Twelve patients with clinically and biochemically proven Cushing's disease were included in the study. In addition, 23 patients with a Rathke's cleft cyst (RCC) diagnosed on an MRI with normal pituitary hormone levels were included as a control, to prevent non-blinded positive results. Postcontrast T1 3D fast spin echo (FSE) images were acquired after DCE images in 3T MRI and image subtraction of pre- and postcontrast T1 3D FSE images were performed. Inter-observer agreement, interpretation time, multiobserver receiver operating characteristic (ROC), and net benefit analyses were performed to compare 2D DCE and T1 3D subtraction techniques. Results: Inter-observer agreement for a visual scale of contrast enhancement was poor in DCE (${\kappa}=0.57$) and good in T1 3D subtraction images (${\kappa}=0.75$). The time taken for determining contrast-enhancement in pituitary lesions was significantly shorter in the T1 3D subtraction images compared to the DCE sequence (P < 0.05). ROC values demonstrated increased reader confidence range with T1 3D subtraction images (95% confidence interval [CI]: 0.94-1.00) compared with DCE (95% CI: 0.70-0.92) (P < 0.01). The net benefit effect of T1 3D subtraction images over DCE was 0.34 (95% CI: 0.12-0.56). For Cushing's disease, both reviewers misclassified one case as a nonenhancing lesion on the DCE images, while no cases were misclassified on T1 3D subtraction images. Conclusion: The T1 3D subtraction technique shows superior performance for determining the presence of enhancement on pituitary lesions compared with conventional DCE techniques, which may aid in diagnosing Cushing's disease.

말기암환자에서 혈중 비타민 D 농도와 생존기간과의 관련성 (Relationship between Vitamin D Level and Survival in Terminally III Cancer Patients)

  • 최선영;최윤선;황인철;이준영
    • Journal of Hospice and Palliative Care
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    • 제18권2호
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    • pp.120-127
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    • 2015
  • 목적: 국내 말기암환자를 대상으로 혈중 vitamin D 농도를 측정하고, 생존기간과의 관련성에 대하여 확인해 본다. 방법: 2012년 5월부터 15개월 동안, 국내 일개 병원의 말기암환자 96명을 대상으로 후향적 의무기록 조사를 시행하였다. Vitamin D 결핍에 영향을 미치는 요인들을 파악하기 위해 단순 로지스틱 회귀분석과 다중 로지스틱 회귀분석을 실시하였고, vitamin D가 생존기간에 미치는 영향을 파악하기 위해 다변수 분석으로 Cox's proportional hazard regression analysis를 실시하였다. 결과: 대상자의 평균 연령은 $67.06{\pm}13.77$세였고, 모든 대상자가 ECOG PS 3점 이상이었으며 혈중25(OH)D 농도는 평균 $8.60{\pm}7.16ng/ml$였다. 3명(3.1%)만이 vitamin D 충분상태(혈중 25(OH)D 농도${\geq}30ng/ml$)였으며, 5명은 vitamin D 상대적결핍상태(혈중 25(OH) 농도 20~30 ng/ml)였고, 13명(13.5%)은 vitamin D 결핍(혈중 25(OH)D 농도 10~20 ng/ml), 75명(78.1%)은 vitamin D 중증결핍상태(혈중 25(OH)D<10 ng/ml) 였다. 혈중 빌리루빈 농도가 1.2 mg/dl 이상인 경우 vitamin D 중증결핍과 관련이 있었다(Odds ratio, OR=5.041; P=0.039). 혈중 빌리루빈 농도가 높을수록 혈중 vitamin D 농도가 낮았으며, 고빌리루빈혈증인 환자는 vitamin D 중증결핍에 속할 위험이 더 크고(OR=18.476, P<0.05), 중앙생존기간도 유의하게 짧았다. Vitamin D 중증결핍인 경우 추정된 중앙생존기간은 짧았으나 통계적 유의성은 없었다. 다변량 분석결과에서 vitamin D 중증결핍은 사망의 위험인자가 아니었다. 결론: 말기암환자에서 혈중 vitamin D 결핍은 매우 심각하였으나, vitamin D 중증결핍이 생존기간에 영향을 미치지는 않았다.

Isolation and Identification of Anthocyanins from Purple Sweet Potatoes

  • Lee, Lan-Sook;Chang, Eun-Ju;Rhim, Jong-Whan;Ko, Byoung-Seob;Park, Sang-Won
    • Preventive Nutrition and Food Science
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    • 제2권2호
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    • pp.83-88
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    • 1997
  • Anthocyanin pigments of purple sweet potato roots (Ipomoea batatas L.) were extracted with 0.5% TFA (Trifluoroacetic acid) in 95% EtOh, and further isolated an purified by Amberlite XAD-7 and ODS column chromatography, and final preparative HPLC. Among nine anthocyanins isolated, the structure of three major anthocyanins were identified as 3-O-(6-O-trans-caffeyl)-2-O-(6-O-trans-caffeylglucopyranosyl)-$\beta$-D-glucopyranosyl-5-O-($\beta$-D-glucopyranosyl)-peonidin, 3-O-(6-O-trans-caffeyl)-2-O-(6-O-trans-feruloyl-glucopyranosyl)-$\beta$-D-glucopyranosyl-5-O-($\beta$-D-glucopyranosyl)-peonidin, and 3-O-(6-O-trans-caffeyl)-2-O-(6-O-p-hydroxylbenzoylglucopyranosyl)-$\beta$-D-glucopyranosyl)-peonidin, by using UV-visible absorption spectra, $^1$H-NMR and FAB-MS analysis.

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굴착방법과 초기지압 조건을 고려한 하중분배율의 산정 연구 (A Study on the Estimation of Load Distribution Factors Considering Excavation Methods and Initial Stress Conditions)

  • 박연준;유일형
    • 터널과지하공간
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    • 제21권3호
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    • pp.192-204
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    • 2011
  • 본 연구에서는 시공단계를 정확하게 고려하여 3차원 해석을 수행하고, 이와 동일한 결과를 나타내는 2차원 해석 결과를 얻고자 천단변위를 기준으로 하여 하중분배율을 결정하였다. 2차원 해석 결과와 3차원 해석 결과에서 천단변위의 총량에는 차이가 있어, 이를 극복하고자 각 단계에서의 천단변위 값을 총 변위량으로 나눈 '천단변위비'를 비교 대상으로 정하였다. 또한 숏벤치 공법이나 미니벤치 공법의 경우에서처럼 상하 반단면 분할굴착에서 벤치의 길이가 짧은 경우에는 하부 반단면의 굴착이 완료된 후에도 굴진면의 지지효과가 사라지지 않는 상황이 발생한다. 이러한 상황을 해석에 반영하고자 4번째 하중분배계수를 도입하여 굴진면 전진 효과를 구현하도록 하였다. 그 결과 전단면 굴착, 상하 반단면 분할굴착, 벤치 길이의 변화 및 초기 응력 상태 등을 고려한 다양한 경우에 대하여 합리적으로 하중분배율을 결정하는 방법을 제시하였다.

Static and quasi-static slope stability analyses using the limit equilibrium method for mountainous area

  • Hosung Shin
    • Geomechanics and Engineering
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    • 제34권2호
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    • pp.187-195
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    • 2023
  • Intensive rainfall during the summer season in Korea has triggered numerous devastating landslides outside of downtown in mountainous areas. The 2D slope stability analysis that is generally used for cut slopes and embankments is inadequate to model slope failure in mountainous areas. This paper presents a new 3D slope stability formulation using the global sliding vector in the limit equilibrium method, and it uses an ellipsoidal slip surface for static and quasi-static analyses. The slip surface's flexibility of the ellipsoid shape gives a lower FS than the spherical failure shape in the Fellenius, Bishop, and Janbu's simplified methods. The increasing sub-columns of each column tend to increase the FS and converge to a steady value. The symmetrical geometric conditions of the convex turning corners do not indicate symmetrical failure of the surface in 3D analysis. Pseudo-static analysis shows that the horizontal seismic force decreases the FS and increases the mass volume at the critical failure state. The stability index takes the FS and corresponding sliding mass into consideration to assess the potential risk of slope failure in complex mountainous terrain. It is a valuable parameter for selecting a vulnerable area and evaluating the overall risk of slope failure.