• Journal of the Korean Society of Radiology
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• v.7 no.4
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• pp.271-275
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• 2013

Shoulder bone scan everyday life, sports activities at the side of the shoulder joint, or applying strong force in the lateral occurs. Mainly on upper arm abduction, temple, other rotational dislocation of the shoulder joint gahaejyeo as useful for observing the presence or absence of lesions is used. Shoulder PA oblique projection prevent distortion of the image due to the angle and the most useful diagnostic radiological investigate shooting angle. Shoulder blade body and the acromion and coracoid process Y-view is formed characters. $10^{\circ}$ angle between the shoulder blades and the acromion is the obstruction. $20^{\circ}{\sim}25^{\circ}$ to the Y-view of the humerus head looks superimposed, the position of the shoulder joint and seemed appropriate. $35^{\circ}$ of the humerus head superimposed on the Y-view, but above the humerus head and shoulder joints were distorted. When $45^{\circ}$ elevation observed on the side of the best has come Y-view also acromion and coracoid process is finished.

• Explosives and Blasting
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• v.35 no.1
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• pp.18-26
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• 2017

In Analysis of Fragmentation of rock blasted, The photo analysis method has been mainly used and these image acquisitions are mainly obtained by digital image from the front of the crushed rock. However, Image analysis is basically advantage of the image of planar shooting not front shooting but There is no way to take a photograph of huge plane rock slope. Thus, Unavoidably It is resolved by distorting or extending the image filmed at the front as well as adjusting it similar to its angle of plane shooting. Lately, With advancing unmanned aerial vehicle, It can simply image the fragment conditions of blasted rock of a high-definition digital image and Through it, It can acquire the most planar image to angle which accumulate cataclastic rock and also can make image analysis. In this study, It has been confirmed that tolerance value of analysis result of image filmed flatly is markedly lower than the existing front filmed image.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.16 no.1
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• pp.103-112
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• 1986

The purpose of this study was to investigate the numbers and causes of retakes in 300 complete mouth radiographic surveys made by 75 senior dental students. According to radiographic techniques and film holding methods, they were divided into 4 groups: Group Ⅰ: Bisecting-angle technique with patient's fingers. Group Ⅱ: Bisecting-angle technique with Rinn Snap-A-Ray device. Group Ⅲ: Paralleling technique with Rinn XCP instrument (short cone) Group Ⅳ: Paralleling technique with Rinn XCP instrument (long cone) The most frequent cause of retakes, the most frequent tooth area examined, of retakes and average number of retakes per complete mouth survey were evaluated. The obtained results were as follows: Group Ⅰ: Incorrect film placement(47.8%), upper canine region, and 0.89 Group Ⅱ: Incorrect film placement (44.0%), upper molar region, and 1.12. Group Ⅲ: Incorrect film placement (79.2%), upper molar region, and 2.05 Group Ⅳ: Incorrect film placement (67.7%), upper molar region, and 1.69. The average number of retakes per complete mouth survey of paralleling technique (Group Ⅲ＋Ⅳ) was higher than that of bisecting-angle technique (Group Ⅰ ＋ Ⅱ) (p<0.01). There was no difference between Group Ⅰ and Group Ⅱ, and between Group Ⅲ and Group Ⅳ in the average number of retakes per complete mouth survey (p>0.05).

• Journal of radiological science and technology
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• v.31 no.2
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• pp.171-175
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• 2008

The aim of this study is to assess the dose reduction of eye lens and availability of bismuth garments resulting from the use of radioprotective bismuth garments to shield the eyes of patients undergoing head CT. Rando phantom and TLDs were used to determine the amount of dose reduction by bismuth shielding of the eye in the following simulated CT scans : (a) scanning of the head including orbits, (b) scanning of the whole head, and (c) $20^{\circ}$ angled scanning of the head excluding orbits. The average dose reduction of eye lens was 43.2%, 36.0% and 1.4% for the three CT scans listed above. Significant reduction in the eye lens dose was achieved by using superficial orbital bismuth shielding during head CT scans. However, bismuth shields should not be used for the patients when their eyes are excluded from the primarily exposed region.

• Journal of the Korean Association of Geographic Information Studies
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• v.8 no.4
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• pp.123-133
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• 2005

This study has made photographing respectively by changing the converging angle by use of d7 $metric^5$ that is a measurement digital camera. And also in order to minimize the errors happened at the relative orientation, we have sorted out the round target that the relative orientation is automatically on the programming and have calculated RMSE by carrying out the bundle adjustment. We think that such a study could be used as very important basic data necessary in deriving the optimal photographic conditions by the close-range digital photogrammetry and in judging such a degree.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.54-55
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• 2017

VR영상은 하나의 카메라가 아닌 여러 대의 카메라로 촬영한 영상을 이어 붙여 만든다. 각각의 카메라로 촬영된 영상은 FOV에서 광원이 서로 다르기 때문에 각 영상의 밝기는 서로 일치하지 않는다. 이러한 밝기 차이는 각 영상을 하나의 VR 영상으로 스티칭 하였을 때 더욱 이질적으로 느껴진다. 본 논문에서는 각각의 카메라 영상이 서로 다른 광원에 의하여 밝기 차이가 발생하였을 때 이를 보상하기 위한 알고리즘을 제안한다.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.24 no.2
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• pp.371-379
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• 1994

본 연구는 비규격화시켜 촬영한 두장의 방사선 사진을 일반 영상처리 프로그램으로 기하학적 보정을 하여 디지탈 공제 촬영술을 시행한 결과를 개인별로 제작된 필름유지장치를 이용하여 규격화 시켜 촬영한 두장의 방사선사진을 디지탈 공제 촬영술을 시행한 결과와 비교하여 일반 영상처리 프로그램의 임상적 유용성을 평가해보고자 시행하였다. 19명의 자원자를 대상으로 하여, 각 환자에서 4매의 하악구치부 치근단 사진을 촬영하였다. 그중 2매는 XCP 필름 유지장치만으로 평행촬영법으로 촬영하였고, 나머지 2매는 교합제에 인상재를 부가하여 개인별로 제작된 XCP필름 유지장치를 이용하여 표준화시켜 역시 평행촬영법으로 촬영하였다. 기하학적 보정은 "Adobe Photoshop"과 "NIH Image" 프로그램으로 시행하였다. 특히 "Adobe Photoshop"의 임의영상회전 기능과 "IH Image"의 공제시술시 중첩된 사진을 투명하게 보여주는 기능, 병진기능을 활용하였다. 두 사진의 유사성을 측정하기 위해 공제된 사진의 계조도의 표준편차를 구하였다. 표준화군의 평균 표준편차가 기하학적 보정군의 평균 표준편차보다 약간 낮았으나, 통계적으로 유의성이 있는 차이를 보이지는 않았다. 위의 결과로 미루어보아, 하악구치부 에서 XCP필름 유지장치로 평행촬영한 비표준화방사선사진을 "Adobe Photoshop"과 "NIH Image" 프로그램을 이용하여 기하학적 보정을 할 수 있으리라 사료된다.

• 한국지형공간정보학회:학술대회논문집
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• 2003.09a
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• pp.207-210
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• 2003

본 연구에서는 측량용 디지털 카메라인 Rollei사에서 제조한 d7 metric과 d7 $metrics^5$를 이용하여 촬영거리와 수렴각을 4m와 $30^{\circ}$로 일정하게 유지하고, 촬영방향을 다르게 하여 촬영하였으며, 또한 표정장업 시 일어나는 오차를 최소화 하기 위해 프로그램상에서 자동적으로 상호표정이 되는 원형타켓을 사용하였으며, 광속조정법을 실시하여 RMSE를 산출하였다. 이러한 연구는 근접사진측량으로 대상물을 측정할 시 촬영여건이 불가피하게 대상물의 중심방향에서 촬영이 어려울 경우 정확도를 평가하는데 이용될 것이라 사료된다.

• Journal of the Korean Society of Radiology
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• v.9 no.6
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• pp.331-335
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• 2015

Consideration of Glenohumeral joint's image with the Changed Body angle of the Glenohumeral joint's Oblique Position in Erect Position. Glenohumeral joint's of Grashey method is a shoulder oblique method available to view the shoulder joint. Grashey method projects AP view of the Glenohumeral joint's so that the Humerus head's subluxation or joint degeneration can be easily visualized. However in this view, the patients, erect position, have to keep their body obliquely. Oblique position is will be needed to get the good quality Glenohumeral joint's view. Therefore, we thought of examining a method which shows the Glenohumeral joint's well by angling the patient one side upward in erect position. For this study, total 20 subject with no history of neurological or psychiatric illness, were recruited for examinations. They consisted of 13 mails and 7 femails, Statistic group analysis was performed with ANOVA test. Score of the evaluation of the expects were $30^{\circ}$ at $0.40{\pm}0.499$, $35^{\circ}$ at $1.34{\pm}0.657$, $40^{\circ}$ at $1.84{\pm}0.573$, $45^{\circ}$ at $0.76{\pm}0.649$, and they were significant(P<0.05). The degree of $40^{\circ}$ views were shown to yield good quality shoulder oblique images.

• Aerospace Engineering and Technology
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• v.7 no.1
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• pp.223-228
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• 2008

In order to acquire the images requested by users, it is very important to calculate mission schedule parameters such as imaging execution time and attitude tilt angle accurately. These parameters are based on orbit prediction. This paper describes the accuracy of orbit propagation for image planning. The orbit prediction data from PSS and MAPS has a certain discrepancy due to different orbit propagator. It is necessary for mission planner to confirm this value during mission planning phase. The pointing error which means the difference between target center and real image received is calculated and analyzed using KOMPSAT-2 image data.