• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.170-171
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• 2019

본 논문은 건물일체형 태양광 발전(Building Integrated PV:BIPV)의 에너지 수급에 대한 특징과 보다 효율적인 시스템 설계 및 최대 에너지 수급기법에 대해 기술한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1103-1106
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• 2004

Window Frame 방향성 추출법을 보완한 Extended Window Frame을 제시하고, 높은 보완성을 필요로 하는 곳에 사용할 수 있도록 하기 위해서 지문의 중심점으로부터 매칭 된 각각의 특징점까지 이르는 선상에 있는 융선을 추적하는 방법을 이용한 검증 방법을 제안한다. 제안된 검증 방법의 성능을 비교하기 위해서 방향성을 추출하는 방법, 특징점을 추출하는 방법을 기존의 여러 가지 방법들로 구현하고 그 결과를 비교, 분석한다.

• Investigative Magnetic Resonance Imaging
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• v.13 no.1
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• pp.81-87
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• 2009

Purpose : We sought to evaluate enhancement of plaque with gadolinium-based contrast agent by magnetic resonance imaging (MRI) in comparison with histopathology, namely lipid-rich and macrophage-rich components that were two representative characteristics of plaque vulnerability using atherosclerotic rabbit aorta in order to determine which histopathologic component is relevant to the enhancement. Materials and Methods : New Zealand white rabbit (n=4, weight 3.0 to 3.5 kg, all male) was used for animal model of atherosclerosis. Atherosclerotic aortic lesions were induced by high-cholesterol diet and double balloon injury. T1-weight axial images were acquired before and after gadolinium-based contrast agent using a 3-T MRI. MR images and the matched histopathological sections (n=35) were divided into 4 quadrants or 3 (n=130). Enhancement ratio (ER, ER=SIpost/SIpre) on MRI was calculated for each quadrant and compared with histopathology in regard to lipid-rich and macrophage-rich areas. Results : Lipid-rich quadrants were 72 and fibrous quadrants were 58. The number of quadrants which had macrophage-rich areas was 105 and that of quadrants which did not have macrophage-rich areas was 25. ER was significantly higher in lipid-rich quadrants than in fibrous quadrants (mean ER 2.25c$\pm$0.41 vs. 2.72$\pm$0.65, p=0.013). ER poorly correlated with macrophage-rich areas when lipid-component was controlled (correlation coefficient -0.203, p=0.236). Conclusion : Lipid-rich plaques showed stronger enhancement than fibrous plaques using a standard gadolinium-based extracellular contrast agent. Macrophage infiltration did not correlate with degree of enhancement. Further study is warranted that account for optimal time of imaging after contrast injection using various plaque models from early to advanced stages and all possible parameters associated with contrast enhancement.

• Journal of the Korean Society of Radiology
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• v.16 no.2
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• pp.87-94
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• 2022

In this study, 61 patients who underwent coronary angiography from March 2018 to August 2019 were divided into Group I (Radial, n=34 patients) and Group II (Femoral, n=27 patients), and compared and analyzed methods using radial and femoral arteries when coronary angiography was performed. As a result of comparative analysis, Catheter usage was reduced in the examination using radial artery, and in the abnormal shape of blood vessels, Loops arterial abnormalities were more in the radial artery (20.6% vs, 0%, p<0.05), and it was found that the abnormal shape of the radial vessels increased with age. 60s, 70s, 80s, 90s or older (0%, 18.2%, 25.0%, 100%)

• Journal of the Korean Society of Radiology
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• v.81 no.5
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• pp.1234-1238
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• 2020

Calcium pyrophosphate dihydrate (CPPD) crystal deposition disease is characterized by chondrocalcinosis, which mainly affects the knees, wrists, pelvis, and rarely, the spine. According to previous reports, CPPD crystal deposits display heterogeneous enhancement on MRI. When combined with inflammation of the surrounding soft tissue, strong enhancement by CPPD crystal deposition may appear similar to imaging features of other conditions such as infectious spondylitis. In these conditions, CT plays an important role in differential diagnosis. Here, we present a case of CPPD crystal deposition disease in the ligamentum flavum of the cervical spine that showed intense enhancement on MRI.

• Journal of the Korean Society of Radiology
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• v.81 no.5
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• pp.1239-1245
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• 2020

Reversible cerebral vasoconstriction syndrome (RCVS) is a clinical and radiological syndrome with primary features that include hyperacute onset of severe headache and segmental vasoconstriction of the cerebral arteries, which resolve within 3 months. Vessel wall enhancement has been reported in some cases of RCVS; however, its pathophysiological and diagnostic implications remain unclear. We review a case of RCVS in a patient with transient vessel wall enhancement on contrast-enhanced fluid-attenuated inversion recovery images, focusing on the pathophysiological and diagnostic implications.

• The Korean Journal of Applied Statistics
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• v.12 no.1
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• pp.153-163
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• 1999

경제학분야에서 소득분배의 불균형 정도에 대한 척도로 널리 이용되는 Lorenz curve를 소개하고, 변환에 의한 Lorenz curve기법을 도입하여 통계학의 주요 주제인 모집단의 분포에 대한 추정에 적용할 수 있는지 조사한다. 여러 특정분포에 대한 변환된 Lorenz curve의 특징을 제시하고 예제로 Hodgkin’s disease 데이터를 이용하여 Q-Q 플롯과 새로 제시한 변환된 Lorenz curve를 비교한다.

• Journal of architectural history
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• v.30 no.2
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• pp.55-70
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• 2021

The Sacheonwangsa temple was established in 670 under the leadership of Myeongnyang in response to the invasion of the Tang Dynasty. At this time, Geumdang hall stylobate was constructed, which was about 30% smaller than the reconstruction. Due to the wartime situation, the construction of wooden buildings did not seem to have been achieved. The Sacheonwangsa temple was reconstructed in 679 as a symbol of the Hoguk(護國) temple. The size of the Geumdang Hall stylobate was planned as an important module for the entire temple. The stylobate fasad was designed at intervals of Tangju(撑柱), just like the JuKhan(柱間) plan of wooden architecture. There is a possibility that eight Devas may have been decorated in Front fasad. When the Sacheonwangsa Temple was rebuilt, the Geumdang Hall was added by the ChayangKhan(遮陽間) and an Ikrang(翼廊) was installed next to it. These changes affect the material and form of the stylobate. It was changed to a durable stone post-lintel style stylobate and the intervals of Tangju(撑柱) in Front fasad was also adjusted. As the highest-quality stylobate in East Asia at the time, the Geumdang Hall stylobate is considered to have taken Silla's architectural skills to the next level.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.7
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• pp.239-244
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• 2018

Both arterial dissection and atherosclerosis are major causes of cerebral infarction and appear to be occlusion or stenosis in magnetic resonance angiography(MRA) and computed tomographic angiography(CTA). But there are differences in treatment because they have different mechanisms. Recently, as high resolution magnetic resonance image(HR-MRI) develops, the image of blood vessel wall can be confirmed non-invasively. Though HR-MRI has become a very useful method for patients with suspected arterial dissection, differential diagnosis of the two diseases has not yet been fully established due to differences in the findings according to stages of arterial dissection and atherosclerosis. We investigated the differences between vertebral artery dissection and atherosclerosis through HR-MRI in two patients and confirmed the diagnosis by CTA follow-up. In addition to the previously established diagnostic criteria, we determined that the long and severe stenosis and recanalization suggest arterial dissection. Characteristics of arterial dissection confirmed by HR-MR and additional studies will be helpful for the treatment.

• Investigative Magnetic Resonance Imaging
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• v.14 no.2
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• pp.151-155
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• 2010

Primary hepatic lymphoma is extremely rare, representing less than 1% of all extranodal lymphomas. We report MR imaging features and pathologic correlation of a case of primary hepatic lymphoma. MR images showed a large lobulated mass with gradual contrast enhancement, resembling intrahepatic cholangiocarcinoma. However, both hepatobiliary phase image obtained 20 minutes after injection of hepatocyte specific contrast agent and diffusion-weighted image demonstrated characteristic three layered pattern representing viable lymphoma in the outer layer, tumor necrosis in the middle layer and necrotic hepatic parenchyma in the center.