• Hip & pelvis
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• 제30권4호
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• pp.219-225
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• 2018

Purpose: Ischiofemoral impingement (IFI)-primarily diagnosed by magnetic resonance imaging (MRI)-is an easily overlooked disease due to its low incidence. The purpose of this study was to evaluate the usefulness of false profile view as a screening test for IFI. Materials and Methods: Fifty-eight patients diagnosed with IFI between June 2013 and July 2017 were enrolled in this retrospective study. A control group (n=58) with matching propensity scores (age, gender, and body mass index) were also included. Ischiofemoral space (IFS) was measured as the shortest distance between the lateral cortex of the ischium and the medial cortex of lesser trochanter in weight bearing hip anteroposterior (AP) view and false profile view. MRI was used to measure IFS and quadratus femoris space (QFS). The receiver operating characteristics (ROC), area under the ROC curve (AUC) and cutoff point of the IFS were measured by false profile images, and the correlation between the IFS and QFS was analyzed using the MRI scans. Results: In the false profile view and hip AP view, patients with IFI had significantly decreased IFS (P<0.01). In the false profile view, ROC AUC (0.967) was higher than in the hip AP view (0.841). Cutoff value for differential diagnosis of IFI in the false profile view was 10.3 mm (sensitivity, 88.2%; specificity, 88.4%). IFS correlated with IFS (r=0.744) QFS (0.740) in MRI and IFS (0.621) in hip AP view (P<0.01). Conclusion: IFS on false profile view can be used as a screening tool for potential IFI.

• 대한수학회지
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• 제11권2호
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• pp.97-119
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• 1974

• 한국물환경학회지
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• 제24권2호
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• pp.147-155
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• 2008

Because of increased nonpoint source runoff potential at highland agricultural fields of Kangwon province, effective agricultural management practices are required to reduce the inflow of sediment and other nonpoint source pollutants into the water bodies. The watershed-scale model, Soil and Water Assessment Tool (SWAT), model has been used worldwide for developing effective watershed management. However, the SWAT model simulated sediment values are significantly affected by the number of subwatershed delineated. This result indicates that the SWAT estimated watershed characteristics from the watershed delineation process affects the soil erosion and sediment behaviors. However, most SWAT users do not spend time and efforts to analyze variations in sediment estimation due to watershed delineation with various threshold value although topography falsification affecting soil erosion process can be caused with watershed delineation processes. The SWAT model estimates the field slope length of Hydrologic Response Unit (HRU) based on average slope of subwatershed within the watershed. Thus the SWAT ArcView GIS Patch, developed by using the regression relationship between average watershed slope and field slope length, was utilized in this study to compare the simulated sediment from various watershed delineation scenarios. Four watershed delineation scenarios were made with various threshold values (700 ha, 300 ha, 100 ha, and 75 ha) and the SWAT estimated flow and sediment values were compared with and without applying the SWAT ArcView GIS Patch. With the SWAT ArcView GIS Patch applied, the simulated flow values are almost same irrespective of the number of subwatershed delineated while the simulated flow values changes to some extent without the SWAT ArcView GIS Patch applied. However when the SWAT ArcView GIS Patch applied, the simulated sediment values vary 9.7% to 29.8% with four watershed delineation scenarios, while the simulated sediment values vary 0.5% to 126.6% without SWAT ArcView GIS applied. As shown, the SWAT estimated flow and sediment values are not affected by the number of watershed delineation significant compared with the estimated flow and sediment value without applying the SWAT ArcView GIS Patch.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.1923-1931
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• 2014

시장에서 공급자와 고객의 가치창출은 학계와 산업계에서 중요한 비즈니스 전략으로 인식되고 있지만 이 현상에 대한 체계화된 연구가 부족하다. 본 연구에서는 해외 저널 및 국내 저널을 포함한 기존의 문헌에 대한 탐색적 연구 및 귀납적 추리를 바탕으로 가치연구의 발전 동향을 시기별, 주제별로 정리하였고 공급자와 고객의 가치창출 현상의 연구를 위한 자원 및 역량 기반 연구체계를 구축하였다. 가치 연구의 연구동향에 대해 주제별로 살펴본 결과 2004년 이전에는 크게 제품 및 서비스의 가치에 대한 연구와 고객과의 관계가치에 대한 연구로 나눌 수 있었고 2004년 이후 각각은 서비스 지배적 논리 및 관계의 효용, 네트워크 및 공급자 체인상의 관계로 발전하였다. 자원과 역량 기반 관점에서 기존의 문헌들을 연구한 결과 4가지의 자원(재무적 자원, 지식 자원, 효율성 자원, 지적 재산 자원)과 4가지의 역량(관계 역량, 협력 역량, 혁신 역량, 관리 역량)을 도출하였고 이를 기반으로 한 연구체계를 수립하였다.

• Imaging Science in Dentistry
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• 제45권3호
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• pp.147-151
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• 2015

Purpose: The aim of this study was to investigate the effects of metal artifacts on the accurate diagnosis of root fractures using cone-beam computed tomography (CBCT) images with large and small/limited fields of view (FOVs). Materials and Methods: Forty extracted molar and premolar teeth were collected. Access canals were made in all teeth using a rotary system. In half of the teeth, fractures were created by the application of mild pressure with a hammer. The teeth were then randomly put into a wax rim on an acryl base designed in the shape of a mandible. CBCT scans were obtained using a Newtom 5G system with FOVs of $18cm{\times}16cm$ and $6cm{\times}6cm$. A metal pin was then placed into each tooth, and CBCT imaging was again performed using the same fields of view. All scans were evaluated by two oral and maxillofacial radiologists. The specificity, sensitivity, positive predictive value, negative predictive value, and likelihood ratios (positive and negative) were calculated. Result: The maximum levels of sensitivity and specificity (100% and 100%, respectively) were observed in small-volume CBCT scans of teeth without pins. The highest negative predictive value was found in the small-volume group without pins, whereas the positive predictive value was 100% in all groups except the large-volume group with pins. Conclusion: The specificity of CBCT decreased with the presence of a pin in the large-volume group, but not in the small-volume group.

• Journal of Information Processing Systems
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• 제18권2호
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• pp.223-234
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• 2022

The evaluation of the print quality of 3D printing has traditionally relied on manual work using dimensional measurements. However, the dimensional measurement method has an error value that depends on the person who measures it. Therefore, we propose the design of a new print quality measurement method that can be automatically measured using the field-of-view (FOV) model and the intersection over union (IoU) technique. First, the height information of the modeling is acquired from a camera; the output is measured by a sensor; and the images of the top and isometric views are acquired from the FOV model. The height information calculates the height ratio by calculating the percentage of modeling and output, and compares the 2D contour of the object on the image using the FOV model. The contour of the object is obtained from the image for 2D contour comparison and the IoU is calculated by comparing the areas of the contour regions. The accuracy of the automated measurement technique for determining, which derives the print quality value was calculated by averaging the IoU value corrected by the measurement error and the height ratio value.

• 대기
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• 제27권4호
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• pp.483-498
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• 2017

Sky view factor can quantify the influence of complex obstructions. This study aims to evaluate the best available SVF method that represents an urban thermal condition with land cover in complex city of Korea and also to quantify a correlation between SVF and mean air temperature; the results are as follows. First, three SVF methods comparison result shows that urban thermal study should consider forest canopy induced effects because the forest canopy test (on/off) on SVF reveals significant difference range (0.8, between maximum value and minimum value) in comparison with the range (0.1~0.3) of SVFs (Fisheye, SOLWEIG and 3DPC) difference. The significance is bigger as a forest cover proportion become larger. Second, R-square between SVF methods and urban local mean air temperature seems more reliable at night than a day. And as the value of SVF increased, it showed a positive slope in summer day and a negative slope in winter night. In the SVF calculation method, Fisheye SVF, which is the observed value, is close to the 3DPC SVF, but the grid-based SWG SVF is higher in correlation with the temperature. However, both urban climate monitoring and model/analysis study need more development because of the different between SVF and mean air temperature correlation results in the summer night period, which imply other major factors such as cooling air by the forest canopy, warming air by anthropogenic heat emitted from fuel oil combustion and so forth.

• 대한전자공학회논문지SD
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• 제39권4호
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• pp.104-111
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• 2002

본 논문에서는 multi-view 영상 디코딩 알고리듬을 구현하는 디코더의 구조를 제안하였다. 현재까지 multi-view 영상 처리를 위한 하드웨어 구조에 관한 연구는 이루어지지 않았다. 제안한 multi-view) 영상디코더는 3 단계 파이프라인 방식으로 동작하며, 매 클럭마다 디코드된 영상의 화소 값을 추출한다. Multi-view 영상 디코더는 3 부분으로 구성된다. 노드의 값을 반복적으로 전송하는 Node Selector, 4개의 노드 값으로부터 각 화소의 값을 추출하는 Depth Extractor와 주어진 시점과 화소의 깊이 값으로부터 영상평면에 투영되는 위치를 생성하는 Affine Transformer로 구성되어 있다. 제안된 구조는 MAX+PLUS II 설계 툴로 설계되었고 시뮬레이션을 수행하였으며, 동작 주파수는 30㎒이다. 제안된 구조를 갖는 디코더로 영상을 실시간으로 복원할 수 있다.

• 한국농촌건축학회논문집
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• 제25권2호
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• pp.43-50
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• 2023

This study is an architectural and landscaping analysis view to rural landscape paintings painted by Vincent van Gogh in the late 19th century. The purpose of this research is to discover the expressive techniques of Western art that Van Gogh's landscape paintings have, and to understand the characteristics of the architectural object in his landscape paintings from February 1888 to April 1889 in Arles, southern France. The method of this study is to analyze the landscape paintings of Van Gogh painted during 15 months in Arles. Among the total paintings in Arles, 47% of the paintings he made were landscapes. The following conclusions have three views. First, Vincent van Gogh was born into a Protestant family in the Netherlands and become an artist in his late twenties. While living in Arles, he painted prolific landscapes. Farming, farmers, and rural area related to normal living are the main subjects of paintings. It can be seen as showing the view that everyday life is sublime and should be included as a unitary value. Second, Gogh's rural landscape paintings were painted with linear and aerial perspective with other the expressive techniques, and plane painting structure that leads to two dimension. Third, from an architectural point of view, Van Gogh's paintings depicted simple vernacular architecture such as traditional rural house, mas, thatched houses, and mills in southern France. This means the normal value of the rural landscape through the eyes of the painter.

• 한국콘텐츠학회논문지
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• 제16권8호
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• pp.470-476
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• 2016

최근 공연예술은 창의적 융복합의 실험적 사고와 다양성을 추구하는 집단지성의 새로운 정착을 추구한다. 이러한 의미로 예술가의 수평적 창작구조 개념과 대중의 개체소통을 이해하고, 융복합의 사례에 적합한 작품 $\ll$시선$\gg$을 분석하였다. 분석결과. 첫째, 공연예술 융복합은 장르별 예술가의 경험적 사고와 통시성으로 접근하고, 작품결과의 해석과 가치는 수평적 관계구조로 공유된다. 둘째, 작품 $\ll$시선$\gg$의 시적이미지의 역동적인 소통과 의미로 표현되었다. 셋째, 융복합의 실험적 창조와 집단지성의 개체소통능력은 새로운 융복합의 가치로 표현되었다. 결국 융복합적 사고의 소통은 집단지성의 실험적 창조를 가능케 하고, 관계 구조는 공연예술의 융복합적 해석과 표현의 유의미한 전이로 확장됨을 결론지었다.