• Journal of radiological science and technology
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• v.38 no.4
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• pp.437-442
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• 2015

Accurate volume measurement of the prostate is a significant role in determining the result of diagnosis and treatment of benign prostate hyperplasia. The purpose of this study was to determine, when measuring prostate volume by TRUS, whether location is more accurately determined by transaxial or longitudinal scanning. With reference to the patient's image, it was produced six prostate model. It compares the actual volume and the measurement volume, and find the optimal measurement position of each specific model. Prostate volume measured by TRUS closely correlates with prostate phantom volume. There was no significant difference(p = .156). To measure the accurate volume of prostate with focal protrusion, its length should be measured exclude the protrusions.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.1411-1414
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• 2005

볼륨 데이터는 시뮬레이션 통해 생성되거나 고성능 측정 장비를 이용해 측정된 값으로 구성되는 고차원 데이터의 한 형태로서 다양한 자연과학과 공학분야에서 폭넓게 활용되고 있다. 최근에는 각 분야에서 생성되는 계산 데이터의 용량이 점점 더 증가하고 있기 때문에 이런 대용량의 볼륨 데이터를 효과적으로 처리하기 위한 기법들에 관한 연구가 수행되고 있으며, 특히 대용량 볼륨 데이터 압축 기법에 대한 필요성이 증가하고 있다. 본 논문에서는 Daubechies 웨이블릿 변환과 zerobit 인코딩 스킴을 응용한 새로운 볼륨 데이터 압축 기법을 제안한다. 이 방법은 기존의 압축 방법에 비해 복원 데이터의 손실이 낮기 때문에 정밀한 영상을 요구하는 대용량 데이터 압축에 유용하게 사용될 수 있다.

• The KIPS Transactions:PartA
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• v.9A no.1
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• pp.83-92
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• 2002

The segmentation of target objects from three dimensional volume images is an essential step for visualization and volume measurement. In this paper, we present a method to detect the surface of objects by improving the widely used levoy filtering for volume visualization. Using morphological operators we generate completely closed surfaces and selectively segment objects using the volume growing algorithm. The presented method was applied to 3-D artificial sphere images and angiocardiograms. We quantitatively compared this method with the conventional levoy filtering using artificial sphereimages, and the results showed that our method is better in the aspect of voxel errors. The results of visual comparison using angiocardiograms also showed that our method is more accurate. The presented method in this paper is very effective for segmentation of volume data because segmentation, visualization and measurement are frequently used together for 3-D image processing and they can be easily related in our method.

• Journal of the Korea Computer Graphics Society
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• v.24 no.2
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• pp.29-40
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• 2018

Direct volume rendering (DVR) is a commonly used method to visualize inner structures in 3D volumetric datasets. However, conventional volume rendering on a 2D display lacks depth perception due to dimensionality reduction caused by ray casting. In this work, we investigate how emerging Virtual Reality (VR) can improve the usability of direct volume rendering. We developed real-time high-resolution DVR system in virtual reality, and measures the usefulness of volume rendering with improved depth perception via a user study conducted by 38 participants. The result indicates that virtual reality significantly improves the usability of DVR by allowing better depth perception.

• The Journal of the Korea Contents Association
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• v.7 no.4
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• pp.206-212
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• 2007

To evaluate the HU value of the IV catheter fragment of CT on the accuracy and size in the peripheral vein. Pilot study of profile and table functions on PC by software was calculated of HU value of IV catheter fragment. This study demonstrates the utility of volume rendering technique to localize a small, subtle IV catheter, which can easily be reformatted of MDCT reformations. IV catheter fragment optimal image described as threshold range. Volume rendering of HU using a MDCT is an excellent method for evaluation the IV catheter fragment in three dimension.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.528-530
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• 2000

최근 객체지향 소프트웨어 개발이 일반화되면서 품질 좋은 객체지향 소프트웨어의 개발을 돕기 위한 목적으로 객체지향 소프트웨어 복잡도 척도에 관한 연구들이 다양하게 행해져 왔다. 대부분의 연구가 구조적 복잡도 측정에 중점을 두어 프로그램 크기와 관련된 요인들을 측정하는 척도들이 제시되었다. 한편 소프트웨어 개발이나 복잡도 측정에 대하여 인지 심리 이론을 적용하여, 인간의 단기 기억의 한계 7$\pm$2와 제어 논리 처리에 3$\pm$1을 고려한 연구들이 많이 행해졌다. 본 논문에서는 프로그램 볼륨과 복잡도의 관계를 조사하기 위해 13개 척도의 값을 추출한 후 통계적 분석을 수행하고, 인지 심리 이론과의 관계를 파악해 보았다.

• Progress in Medical Physics
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• v.20 no.4
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• pp.208-215
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• 2009

This study is to compare the accuracy of evaluation regarding the volume of the prostate, which three-dimensional volume rendering was produced the shape of protrusion, by measuring two kinds of craniocaudal length from the top of the protrusion and from the exclusion of the protrusion as the starting points. For the imaginary protrusion prostate models, total of 10 models were roughly made by using devils-tongue jelly and changing each of the 10 ml of capacity from 10 ml to 100 ml. For the protrusion prostate models aimed at estimating the real volume, through 64 cannel computed tomography (CT) and 3.0 tesla magnetic resonance image (MRI) were conducted by planimetry technique from three-dimensional volume rendering. And then we performed to evaluate on significance of these volumes by wilcoxon signed rank test. Also the obtained volumes data by ellipsoid volume formula were measured the volume of protrusion prostate models two times with each method using the two kinds of craniocaudal length from top of the protrusion and from exclusion of the protrusion as the starting points. Finally, the significance of differences using wilcoxon signed rank test was evaluated between the real volume by planimetry technique and the measured volume by ellipsoid volume formula from three-dimensional volume rendering. The average of the protrusion length on the models was $0.90{\pm}0.18\;mm$ in CT and was $0.75{\pm}0.11\;mm$ in MRI. There were not statistically significant difference between MRI and CT from the volume of protrusion prostate models (p=0.414). In MRI (p=0.139) and CT (p=0.057), there were not statistically significant difference between the real volume by planimetry technique and the measured volume by ellipsoid volume from exclusion of the protrusion as the starting points. While, there were statistically significant difference between the real volume by planimetry technique and the measured volume by ellipsoid volume from top of the protrusion as the starting points in MRI (p=0.005) and CT (p=0.005). For the accurate measurement of the protrusion prostate models, the craniocaudal length of the prostate should be measured from the exclusion of the protrusion as the starting points.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.06a
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• pp.1077-1082
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• 2005

It's important that the measurement of ship's draft, cargo tank level & volume is relative to ship's stability and fee. In this paper, the corrected level and volume technique is introduced.

• Journal of the Korea Computer Industry Society
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• v.2 no.3
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• pp.377-388
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• 2001

Software metrics provide effective methods for characterizing software. Metrics have traditionally been composed through the definition of an equation, but this approach restricted within a full understanding of every interrelationships among the parameters. This paper use fuzzy logic system that is capable of uniformly approximating any nonlinear function and applying cognitive psychology theory. First of all, we extract multiple regression equation from the factors of 12 software complexity metrics collected from Java programs. We apply cognitive psychology theory in program volume factor, and then measure program volume complexity to execute fuzzy learning. This approach is sound, thus serving as the groundwork for further exploration into the analysis and design of software metrics.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.118-120
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• 2006

최신 GPU는 일반 CPU보다 10배 이상 빠른 연산능력을 갖추고 있는데다가 사용자가 직접 프로그래밍 할 수 있기 때문에 이를 이용한 고속 볼륨 렌더링 알고리즘에 대한 연구가 활발하게 진행되고 있다. 그러나 스트림 프로세싱에 특화 돼있는 GPU의 특성상 early ray termination과 empty space skipping을 구현하는 것이 쉽지만은 않다. 특히 지금까지 제안됐던, 프록시 도형(proxy geometry)을 사용하는 볼륨 렌더링 알고리즘은 empty space skipping은 비교적 효율적으로 구현하지만 early ray termination의 지원은 상대적으로 미비했다. 본 논문에서는 스텐실 버퍼와 OpenGL 확장(extension)을 이용한 2-Pass 알고리즘을 통해서 early ray termination과 empty space skipping을 동시에 구현하는 방법을 제시하고, 그 성능을 측정했다.