• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.811-813
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• 2005

주어진 영상에서 인체를 찾고 그 자세를 인식하기 위해 자세나 조영 조건의 변화에 됨 민감한 방법으로 구성요소에 기반한 접근이 있다. 본 논문에서는 10개의 구성요소와 그들간의 유연한 연결로 구성된 인체모델을 사용한다. 각 구성요소는 기하학적, 명시적, 다른 구성요소와의 연결요소에 대한 정보로 구성되어 있다. 인체구성요소 사이의 계층적 연결은 일반-상세 탐색으로 시간효율적인 인체 매칭을 가능케 한다. 본 논문에서는 새로운 인체를 찾을 때마다 인체 구성요소를 갱신함으로써 자세 및 조명 변화에 보다 적응적으로 자세를 추정하는 방법을 제안한다.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.1
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• pp.15-24
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• 1996

This paper presents a new method for visual servoing to control the pose(position and orientation) of the robotic manipulators for grasping the 3-D moving object whose initial pose and moving informations are unknown by using the stereo camera. The stereo camera is mounted on the end-effector of robotic manipulator. In order to track the current pose of robotic manipulator to the desired pose, we use the image Jacobian, which is described by the differential transform, relating the change in image feature point to the change in the object's pose with respect to the camera. In this paper the simple PD controller is adopted for the robotic manipulator to track the desired pose. Finally, the effectiveness of the proposed method is confirmed by some computer simulations.

• The Journal of Korean Society for Radiation Therapy
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• v.14 no.1
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• pp.85-88
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• 2002

I. 목적 : arm-up holder는 흉부 및 복부 질환 치료의 환자고정에 유용하게 사용하고 있으나 손잡이 부분과 어깨가 닿는 부분까지 거리 때문에 동일한 자세를 유지하는데 불편함이 있다. 특히 긴장을 많이 하거나 기력이 없는 환자는 방사선 치료 시 자세의 불안정으로 인하여 치료의 정확성이 떨어질 수 있다. 이에 본원에서는 현재 사용하고 있는 arm-up holder에 팔의 지지를 위한 보조기구를 제작하여 유용성을 평가하였다. II. 대상 및 방법 : 기존의 arm-up holder에 어깨받침대를 부착하여 개선된 arm-up holder를 제작하였다. 실험을 위하여 기존의 arm-up holder를 사용하는 환자그룹과 개선된 arm-up holder를 사용하는 그룹으로 구분하여 자세 변화를 평가하였다. 두 그룹의 환자를 대상으로 모의 치료를 실시한 후 치료실에서 L-gram 을 2회 씩 촬영하여 치료하고자 하는 portal film과 isocenter의 변화를 측정했다. 각 그룹 당 10명씩의 환자를 선정하여 반복 조사하였다. III. 결과 : 개선된 arm-up holder를 사용한 그룹의 isocenter 의 변화는 최대 2mm, 최소 0.5mm 평균 1.2mm 이다. 기존의 arm-up folder를 사용한 그룹과 비교하여 평균변화는 약 2배로 나라났고, 최대 변화는 2.5배의 오차범위가 측정되었다. IV. 결론 : 현재 사용하고 있는 arm-up holder는 흉부 및 복부의 사방향 방사선 치료 시 팔에 의한 방사선 감약을 예방할 수 있는 유용한 고정용구이다. 하지만 팔을 올리고 있는 자세는 환자에게 불편함을 야기 시키며 이로 인한 치료의 정확성을 감소시킬 수 있다. 따라서, 기존의 arm-up holder에 보조기구를 제작하여 사용함으로써 환자의 불편함을 개선하고, set-up 의 안정성과 재현성을 향상시킬 수 있었다.

• Bulletin of the Korean Space Science Society
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• 2001.11a
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• pp.20-20
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• 2001

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.275-276
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• 2016

In this paper, we were implemented the application to induce correct posture by recognizing the incorrect posture of the user. Implemented system uses kinect sensors to determine the user's position information, it has been developed posture determination algorithm that can determine the four wrong posture and correct posture. In addition to PC in order to improve the user convenience and accessibility, to implement real-time monitoring application that can determine the user's position in the smartphone. For the system of performance evaluation of and promote the attitude determination experiment to target the five college students, the experimental results sensitivity and specificity of it it was found that the attitude determination performance is excellent at 0.956.

• The Korean Journal of Nuclear Medicine Technology
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• v.16 no.1
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• pp.91-95
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• 2012

Purpose: In this study, we evaluated the ejection fraction (EF) according to the difference of patient position in Gated Blood Pool (GBP) scan. Material and Methods: The analysis was performed to 80 patients ($51.2{\pm}17.4$ years old) who examined GBP scan in Department of nuclear medicine, National Cancer Center from March 2011 to August 2011. We divided the patients into two groups; one group received conventional position (raise left arm up supine) and supine position (group 1) and the other group received conventional position and left arm back down supine position (group 2). To observe the change EF according to patient position difference, the image was reconstructed and analyzed by Xeleris (GE, USA). We measured body mass index (BMI) of patients. Result: In group 1, EF error less than 3% occurred at a rate of 72.5% (29 of the 40 patients). In group 2, EF error less than 3% occurred at a rate of 79% (32 of the 40 patients). The patient's BMI did not affect ejection fraction. Conclusion: The EF error of left arm back down supine position closer to conventional position than in supine position shows the results.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.100-105
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• 2021

본 논문에서는 뉴럴넷 기반 렌더링 비교 방식을 사용하여 가구 조립 설명서에 표기된 부품의 자세를 추정하는 방법을 제안한다. 제안하는 방법은 부품의 자세를 임의로 가정한 후, 가정한 자세로 투사한 부품의 영상과 설명서의 부품 영상을 비교하여 두 영상의 부품을 일치시키는 자세 변화를 추정하는 방식으로 진행된다. 또한, 설명서에 반복적으로 모델을 적용하여 부품의 자세를 점차적으로 정확하게 보정하는 방식을 사용하였으며, 네트워크의 구성 및 자세 추정에 사용되는 목표 함수를 다양하게 실험하여 성능을 비교하였다. 본 연구에선 IKEA 의 Stefan 의자 조립 설명서의 부품 데이터셋으로 실험을 진행하였으며, 해당 데이터셋에 대하여 제안하는 방법이 정확하게 자세를 보정함을 확인하였다.

• The Journal of Korean Society for Radiation Therapy
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• v.27 no.2
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• pp.175-181
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• 2015

Purpose : To evaluate Contralateral Breast Doses with Supine and Prone Positions for tangential Irradiation techniques for left-sided breast Cancer Materials and Methods : We performed measurements for contralateral doses using Human Phantom at each other three plans (conventional technique, Field-in-Field, IMRT, with prescription of 50 Gy/25fx). For the measurement of contralateral doses we used Glass dosimeters on the 4 points of Human Phantom surface (0 mm, 10 mm, 30 mm, 50 mm). For the position check at every measurements, we had taken portal images using EPID and denoted the incident points on the human phantom for checking the constancy of incident points. Results : The contralateral doses in supine position showed a little higher doses than those in prone position. In the planning study, contralateral doses in the prone position increased mean doses of 1.2% to 1.8% at each positions while those in the supine positions showed mean dose decreases of 0.8% to 0.9%. The measurements using glass dosimeters resulted in dose increases (mean: 2.7%, maximum: 4% of the prescribed dose) in the prone position. In addition, the delivery techniques of Field-in-field and IMRT showed mean doses of 3% higher than conventional technique. Conclusion : We evaluated contralateral breast doses depending on different positions of supine and prone for tangential irradiations. For the phantom simulation of set-up variation effects on contralateral dose evaluation, although we used humanoid phantom for planning and measurements comparisons, it would be more or less worse set-up constancy in a real patient. Therefore, more careful selection of determination of patient set-up for the breast tangential irradiation, especially in the left-sided breast, should be considered for unwanted dose increases to left lung and heart. In conclusion, intensive patient monitoring and improved patient set-up verification efforts should be necessary for the application of prone position for tangential irradiation of left-sided breast cancer.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.5
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• pp.402-409
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• 2018

In this paper, we propose a lunar landing scenario of a robotic lunar landing mission and implements an optimal landing trajectory at the powered descent phase based on the proposed scenario. The change of attitude of the lunar lander in the power descent phase affects not only the amount of fuel used but also sensor operation of image based navigation. Therefore, the attitude angular velocity is included in the cost function of the optimal control problem to minimize the unnecessary attitude change when the optimal landing trajectory generates at powered descent phase of the lunar landing. The influence of the change of attitude angular velocity on the optimal landing trajectory are analyzed by adjusting the weight of the attitude angular velocity. Based on the results, we suggest the proper weight to generate the optimal landing trajectory in order to minimize the influence of the attitude angular velocity.

• Journal of the Korean Society of Radiology
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• v.5 no.2
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• pp.59-66
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• 2011

There is a difficulty because of classifying the anatomical structure in the neck CT scan by the beam hardening artifact no more than disease and it including the 6, 7 number cervical spine and intervertebral disk. In case of enforcing the neck CT scan cause of the inner diameter of beam artifact tried to be inquired by the image evaluation according to the change of the image evaluation according to the direction of the shoulder joint applying the variation method of a posture and location and Kernel value and it was most appropriate, the lion tax and Kernel value try to be searched for through an experiment. Somatom Sensation 16 (Siemens, Enlarge, Germany) equipment was used in a patient 30 people coming to the hospital for the neck CT scan. A workstation used the AW 4.4 version (GE, USA). According to a direction and location of the shoulder joint, the patient posture gave a change to the direction of the shoulder joint as the group S it gave a change as three postures and placed the both arms comfortably and helps a group N and augmented unipolar left in the wealthy merchant and group P it memorized the both hands and ordered the eversion and drops below to the utmost and enforced a scan. By using a reconstructing method as the second opinion, it gave and reconstructed the Kernel value a change based on scan data with B 10 (very smooth), B 20 (smooth), B 30 (medium smooth), B 40 (medium), B 50 (medium sharp), B 60 (sharp), and B 70 (very sharp). By using image data which gave the change of the examination posture and change of the Kernel value and are obtained, we analyzed through the noise value measurement and image evaluation of. The outside wire eversion orders the both hands and the examination posture is cost in the neck CT scan with the group P it drops below to the utmost. And in case of when reconstructing with B 40 (medium) or B 50 (medium sharp) being most analyzed into the inappropriate posture and Kernel value and applying the Kernel value to a clinical, it is considered to be very useful.