• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.76-77
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• 2022

본 논문에서는 다시점에서의 자세 추정 결과를 정합하여 3D 볼류메트릭 데이터 시퀀스의 3D 자세 추정 결과의 떨림을 줄이는 방법을 제안한다. 볼류메트릭 모델을 중심으로 원을 그리며 일정 각도 간격의 시점에서 본 모델을 평면에 투사한다. 투영하여 얻은 2D 영상에 대해 Openpose를 이용하여 2D 자세 추정을 진행한 뒤, 2D 관절 정보를 정합하여 3D 관절 위치를 국한한다. 각도 간격에 따라 다른 3D 관절의 떨림의 정도를 수치화하여 표로 나타내고, 안정적인 결과를 위한 최소 조건을 확인하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.646-651
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• 2003

Quantitative performance test on the conventional 2D-PIV and the hybrid angular 3D-PIV (Stereoscopic PIV) was carried out. LES Data sets on an impinging jet which are provided on the webpage(http://www.vsj.or.jp/piv) for the PIV Standard Project were used for the generation of virtual images. The generated virtual images were used for the 2D-PIV and 3D-PIV measurements. The measurement results showed that the results obtained by 2D-PIV on average values are closer to the LES data than those obtained by 3D-PIV, but the turbulent properties obtained by 2D-PIV are largely underestimated than those obtained by 3D-PIV.

• Computers and Concrete
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• 제18권3호
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• pp.319-336
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• 2016

In this study, both two- and three-dimensional (2D and 3D) finite-volume-based models were developed to analyze the heat transfer mechanisms through the porous structures of cellular concretes under steady-state heat transfer conditions and to investigate the differences between the 2D and 3D modeling results. The 2D and 3D reconstructed pore networks were generated from the microstructural information measured by 3D images captured by X-ray computerized tomography (X-CT). The computed effective thermal conductivities based on the 2D and 3D calculations performed on the reconstructed porous structures were found to be nearly identical to those evaluated from the 2D cross-sectional images and the 3D X-CT images, respectively. In addition, the 3D computed effective thermal conductivity was found to agree better with the measured values, in comparison with the 2D reconstruction and real cross-sectional images. Finally, the thermal conductivities computed for different reconstructed porous 3D structures of cellular concretes were compared with those obtained from 2D computations performed on 2D reconstructed structures. This comparison revealed the differences between 2D and 3D image-based modeling. A correlation was thus derived between the results of the 3D and 2D models.

• 대한수학회보
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• 제56권3호
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• pp.649-658
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• 2019

In this paper, we prove some congruences involving the generalized Catalan numbers and harmonic numbers modulo $p^2$, one of which is $$\sum\limits_{k=1}^{p-1}k^2B_{p,k}B_{p,k-d}{\equiv}4(-1)^d\{{\frac{1}{3}}d(2d^2+1)(4pH_d-1)-p\({\frac{26}{9}}d^3+{\frac{4}{3}}d^2+{\frac{7}{9}}d+{\frac{1}{2}}\)\}\;(mod\;p^2)$$, where a prime number p > 3 and $1{\leq}d{\leq}p$.

• 한국식품조리과학회지
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• 제13권2호
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• pp.173-178
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• 1997

HPLC를 이용하여 표고(동고, 화고), 팽이, 양송이, 목이, 석이, 운지, 영지버섯에 존재하는 비타민 D$_2$와 비타민 D$_3$의 양을 측정했다. HPLC는 external standard 방법을 이용하였다. 검화, 추출, 건조, 거름, 과정을 거친 시료 20 ${\mu}\ell$를 HPLC에 투입해 비타민 D$_2$와 비타민 D$_3$의 양을 측정했다 버섯들 중에 비타민 D$_2$와 비타민 D$_3$의 양이 가장 많은 것은 목이버섯(167.8$\mu\textrm{g}$/100g) 이었으며 가장 적은 것은 양송이로(7.2$\mu\textrm{g}$/100g)로 분석 됐다. 버섯에 존재하는 비타민 D의 함량이 연구자에 따라 많은 차이가 있는데 이는 버섯의 수확시기, 재배조건, 재배종자, 건조 조건에 기인한 것으로 보인다.

• 한국산학기술학회논문지
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• 제14권11호
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• pp.5385-5391
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• 2013

온라인을 기반한 제품의 구매가 활성화 됨에 따라, 소비자들의 제품 디자인에 대한 사실적이고 정확한 정보를 요구하고 있다. 본 연구에서는 제품의 형상정보(3D mesh)와 색/질감정보(image)를 이용하여 텍스쳐 맵핑된 실사적 3차원 모델을 생성하는 효율적인 방법을 제안한다. 3 차원 형상정보에 대응하는 이미지 상의 텍스쳐 좌표 관계를 구하기 위해 오브젝트 좌표계와 카메라 좌표계 사이의 변환행렬, 카메라의 초점거리, 카메라 CCD 와 프레임상의 이미지 사이의 종횡비를 파라미터로 하는 2D-3D 정합을 수행한다. 이러한 2D-3D 정합에 있어 발생하는 연산의 복잡도와 비선형도를 낮추기 위하여, 카메라 내부파라미터 검정단계, 임의의 회전행렬에 대한 임시적 최적 이동 벡터 (TOTV), 회전행렬에 대한 비선형 최적화 단계로 접근한다. 제안하는 방법의 유용성을 시현하기 위해 3차원 컬러 측정기로는 색외관을 획득하기 힘든 메탈릭 페인트 재질로 이루어진 제품에 적용한 구현결과를 보인다.

• Journal of Microbiology and Biotechnology
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• 제32권6호
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• pp.740-748
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• 2022

As circ_UBE2D2 has been confirmed to have targeted binding sites with multiple miRNAs involved in septic acute kidney injury (SAKI), efforts in this study are directed to unveiling the specific role and relevant mechanism of circ_UBE2D2 in SAKI. HK-2 cells were treated with lipopolysaccharide (LPS) to construct SAKI model in vitro. After sh-circ_UBE2D2 was transfected into cells, the transfection efficiency was detected by qRT-PCR, cell viability and apoptosis were determined by MTT assay and flow cytometry, and expressions of Bcl-2, Bax and Cleaved-caspase 3 were quantified by western blot. Target genes associated with circ_UBE2D2 were predicted using bioinformatics analysis. After the establishment of SAKI rat model, HE staining and TUNEL staining were exploited to observe the effect of circ_UBE2D2 on tissue damage and cell apoptosis. The expression of circ_UBE2D2 was overtly elevated in LPS-induced HK-2 cells. Sh-circ_UBE2D2 can offset the inhibition of cell viability and the promotion of cell apoptosis induced by LPS. Circ_UBE2D2 and miR-370-3p as well as miR-370-3p and NR4A3 have targeted binding sites. MiR-370-3p inhibitor reversed the promoting effect of circ_UB2D2 silencing on viability of LPS-treated cells, but shNR4A3 neutralized the above inhibitory effect of miR-370-3p inhibitor. MiR-370-3p inhibitor weakened the down-regulation of NR4A3, Bax and Cleaved caspase-3 and the up-regulation of Bcl-2 induced by circ_UB2D2 silencing, but these trends were reversed by shNR4A3. In addition, sh-circ_UBE2D2 could alleviate the damage of rat kidney tissue. Circ_UBE2D2 mitigates the progression of SAKI in rats by targeting miR-370-3p/NR4A3 axis.

• Clinics in Shoulder and Elbow
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• 제23권3호
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• pp.119-124
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• 2020

Background: This study was performed to compare glenoid version and inclination measured using two-dimensional (2D) images from computed tomography (CT) scans or three-dimensional (3D) reconstructed bone models. Methods: Thirty patients who had undergone conventional CT scans were included. Two orthopedic surgeons measured glenoid version and inclination three times on 2D images from CT scans (2D measurement), and two other orthopedic surgeons performed the same measurements using 3D reconstructed bone models (3D measurement). The 3D-reconstructed bone models were acquired and measured with Mimics and 3-Matics (Materialise). Results: Mean glenoid version and inclination in 2D measurements were -1.705° and 9.08°, respectively, while those in 3D measurements were 2.635° and 7.23°. The intra-observer reliability in 2D measurements was 0.605 and 0.698, respectively, while that in 3D measurements was 0.883 and 0.892. The inter-observer reliability in 2D measurements was 0.456 and 0.374, respectively, while that in 3D measurements was 0.853 and 0.845. Conclusions: The difference between 2D and 3D measurements is not due to differences in image data but to the use of different tools. However, more consistent results were obtained in 3D measurement. Therefore, 3D measurement can be a good alternative for measuring glenoid version and inclination.

• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.479-486
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• 2016

In this paper, the algorithm which can convert a 2D image into a 3D Model will be discussed. The 2D picture drawn by a user is scanned for image processing. The Canny algorithm is employed to find the contour. The waterfront algorithm is proposed to find foreground image area. The foreground area is segmented to decompose the complex shapes into simple shapes. Then, simple segmented foreground image is converted into 3D model to become a complex 3D model. The 3D conversion formular used in this paper is also discussed. The generated 3D model data will be useful for 3D animation and other 3D contents creation.

• 방송공학회논문지
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• 제17권2호
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• pp.400-410
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• 2012

최근 3D 영화를 시작으로 TV, 휴대전화, PC 게임 등 다양한 분야에서 3D 영상을 접할 수 있다. 3D 영상은 기존의 2D 영상에서 볼 수 없었던 깊이감이라는 새로운 정보를 제공하여 영상의 실감을 극대화 할 수 있지만, 시각피로 혹은 영상의 왜곡과 같은 단점도 가지고 있다. 본 연구는 3D 디스플레이에서 대상의 깊이에 따라 달라지는 크기지각의 예측함수를 개발하였다. 실험 1에서 참가자들은 물리적으로 고정된 크기의 3D 사각형을 관찰하면서, 그 크기와 동일하게 2D 사각형의 크기를 조절하는 과제를 수행하였다. 반대로, 실험 2에서 참가자들은 물리적으로 고정된 크기의 2D 사각형을 관찰하면서, 3D 사각형의 크기를 조절하는 과제를 수행하였다. 실험 1과 2에서 모두 3D 사각형의 깊이에 따라 크기지각이 선형적으로 변화함을 관찰하였으며, 두 실험에서 획득한 깊이와 크기지각의 선형함수는 동일하였다. 본 연구에서 획득한 예측함수는 깊이에 따라 대상의 크기가 어떻게 지각되는지를 미리 예측할 수 있으므로 3D 영상제작에서 매우 유용할 것이다.