• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.2773-2779
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• 2013

The purpose of this study was to evaluate of the usefulness and to develop new auxiliary equipment that can bending angle of the bone of the knee various depending on the thickness of the thigh of the human. The subjects agreed for research purposes and were selected from normal person who do not have past knee-related diseases and grouped thin group A and thick group B for the thigh. We set in order to obtain images in the axial direction of the bones of the knee, $35^{\circ}$ to increase by $5^{\circ}$ angle of knee flexion, $45^{\circ}$, to $55^{\circ}$, and we performed combinations of 9 tests by incident angle X-ray per each angle, $40^{\circ}$, $50^{\circ}$ and $60^{\circ}$. As a result, we have developed an Merchant auxillary equipment of X-ray table integral type in radiographic images which was easy to use and could take images of various integral knee joint angles adjusting different body types. Using the auxiliary equipment, in the case of X-ray incident angle $50^{\circ}$ and $60^{\circ}$ with the knee flexion angle of $40^{\circ}$ in group A, and in group B, Knee flexion angle of $45^{\circ}$ and $35^{\circ}$, the X-ray incident angle at $60^{\circ}$, excellent images were derived. Future, it would be very useful in the examination of patients with a variety of body types.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04b
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• pp.1237-1240
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• 2001

최근 제품의 초소화와 반도체의 고집적화로, 작은 크기로 많은 리드를 제공하기 위해, 부품 밑면에 격자형태로 볼이 배열되어 있는 BGA나 CSP부품들이 최근 많이 이용되고 있다. 하지만, BGA는 한번 PCB에 장착되면, 볼 외관검사가 원천적으로 불가능하므로, 부품을 장착하기 전에 볼 품질의 검사와 부품의 정밀한 위치 및 각도의 측정이 요구된다. 본 논문에서는 BGA부품의 위치 및 각도를 추출하기 위한 방법과 볼을 검사하기 위한 알고리즘을 소개한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.607-610
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• 2003

지문 정합을 할 때 특징점 사이의 거리와 각도가 유사한 순서대로 있는가를 비교하는 알고리즘을 제안한다. 한 점에서 가장 가까운 특징점을 찾고 다시 찾은 점에서 가장 가까운 특징점을 찾는데 이러한 세 개의 특징점들 사이의 거리와 끼인 각도를 기본 요소로 하여 이들의 순차를 특징점 배치도로 정의하여 등록지문에도 유사한 순차가 있는지를 검사한다. 정합 시에 특징점 사이의 거리, 각도 순차가 있는가를 검사하기 때문에 중심점을 찾지 않아도 되며 지문의 이동, 회전에 영향을 받지 않는다.

• Journal of Broadcast Engineering
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• v.26 no.6
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• pp.790-798
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• 2021

In this paper, we propose a method to improve the accuracy of positioning by adding angle and distance validation to the existing Bluetooth-based positioning method using the angle of arrival. In the existing positioning method, an error occurs in the positioning value due to a multipath phenomenon induced in a non-visible distance environment. The proposed method derives the maximum and minimum angles of arrival that can be measured in consideration of the moving speed of the positioned device, and then examines whether the measured angle of arrival exceeds the range of the maximum and minimum angles of arrival. The accuracy of positioning is improved by conducting a distance validation check to see if the location of the device to be positioned and the distance to the positioning device exceed the effective distance. A simulation was conducted to analyze the positioning performance between the proposed method and the existing method, and it was confirmed that the positioning performance was improved through angle and distance validation compared to the existing method in a situation where the positioning error increased through the simulation results.

• The Journal of Korean society of community based occupational therapy
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• v.7 no.1
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• pp.17-24
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• 2017

Objective : The purpose of this study was to estimate the reliability of cervical range of motion measurement in healthy adults using smart phone application and goniometer that can be easily applicated in clinical setting. Methods : The cervical range of motion was measured as the flexion, extension, right rotation, left rotation, right lateral flexion, and left lateral flexion. To measure the reliability of intra-rater and inter-rater reliability, the same examiner performed two measurements and the other examiner performed once, total measurement were performed three times. The order of tests was randomized and two examiners didn't know the results of measurements. Results : Thirty healthy adults were participated. The result of this study shows that there were are no significant differences in all movements except the right lateral flexion in comparison of average angle of smart phone application and goniometer. The intra-rater reliability of smart phone application and goniometer showed ICC as .841~.958 and the inter-rater reliability showed ICC as .720~.944 for all movements. Conclusion : These results suggest that smart phone application and goniometer have proven to be reliable in measuring the cervical range of motion. Smart phone application can be used as a useful tool in clinical setting due to fast and accurate measurements of cervical range of motion.

• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.2
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• pp.185-191
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• 2012

Typically, a wedge is involved to generate effectively high inspection angle in pipe weld inspection using phased array ultrasonic technique. But the usage of this wedge for weld or access limited area can cause coverage limitation for the examination volume because of the wedge front length. Therefore, the shear wave phased array probe which can generate high inspection angle without wedge is essentially necessary. In this paper, the shear wave phased array ultrasonic probe which can generate high inspection angle designed by modeling and manufactured from the modelling result. And this shear wave probe tested whether it can detect and sizing for EDM test block that contains various depth. As results, the experimental results show that the designed shear wave phased array probe can detect and size with reliable accuracy. Therefore if this phased array probe apply in field inspection, it is expected that it show more reliable inspection result for plant structure having access limitation.

• Journal of the Korean Society for Nondestructive Testing
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• v.31 no.5
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• pp.536-542
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• 2011

Dissimilar metal welds in nuclear power plant are known as very susceptible to PWSCC flaws, and periodically inspected by the qualified inspector and qualified procedure during in-service inspection period. According to field survey data, the majority of their DMWs are located on tapered nozzle or adjacent to a tapered component. These types of configurations restrict examination access and also limit examination volume coverage. Additionally, circumferential scan for axially oriented flaw is very difficult to detect located on tapered surface because the transducer can't receive flaw response from reflector for miss-orientation. To overcome this miss-orientation, it is necessary adapt skewed ultrasonic transducer accomodate tapered surface. The skewed refracted longitudinal ultrasonic transducer designed by modeling and manufactured from the modelling result for axial flaw detection. Experimental results showed that the skewed refracted longitudinal ultrasonic transducer get higher flaw response than non-skewed refracted longitudinal ultrasonic transducer.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.2
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• pp.247-252
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• 2014

Purpose: This study was to investigate the properties and the location of neural reorganization following eccentric viewing training. Methods: 14 subjects with normal vision took part in eccentric viewing training. The measurements of the light sensitivity and multifocal electroretinogram were performed before and after the training. Results: The measurements of the light sensitivity and multifocal electroretinogram for pre-eccentric viewing training and post-eccentric viewing training showed the significant difference (p<0.047 and p<0.028, respectively). Conclusions: The retinal outer plexiform layer is unable to regenerate. However, the neural reorganization in the retinal outer plexiform layer is able to take place following eccentric viewing training.

• Journal of the Korean Society of Radiology
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• v.12 no.4
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• pp.525-532
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• 2018

This study is filmed by applying the axial angle variation of the X-ray tube instead of the patient's position change during the perimetric examination of the ribs. A Reference image with the rib oblique examination using a chest phantom and experimental images applied with a six-phase variation in the axial angle by increasing $5^{\circ}$ tube angle each from $5^{\circ}{\sim}30^{\circ}$ from the vertical incident direction of the chest phantom to the right horizontal axis were obtained. For the quantitative comparative evaluation of the images, SNR and CNR were calculated for regions of interest in the experimental images based on the reference image. Also, the left-right rib ratio in the reference image and the left-right rib ratio in the experimental images are measured and compared. As a result of the study, the experimental images with a tube angle of $25^{\circ}$ were best shown in the measurements of the SNR, CNR and left-right rib ratio compared to the reference image with a standard examination method. The modified rib examinations will consider useful, if it is difficult to maintain the patient's examination position.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.1
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• pp.19-26
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• 2004

In this paper, we suggest a 3D vision inspection method which use only one camera. If we have the database of pattern and can recognize the object, and also estimate the rotated shape of the parts, we can inspect the parts using only one image. We used the 3D database and the 2D geometrical pattern matching, and the rotation transition theory about the algorithm. As the results, we could have the capability of the recognition and inspection of the rotated object through the estimation of rotation an81e. We applied our suggested algorithm to the inspection of typical IC and capacitor, and compared our suggested algorithm with the conventional 2D inspection method and the feature space trajectory method.