• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.443-444
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.9-10
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• 2009

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.329-330
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• 2010

• Radiation Oncology Journal
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• 제12권1호
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• pp.117-121
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• 1994

연구목적 : 국소재발을 줄이면서 합병증을 최소화하기 위한 방법으로 제안된 수술중 방사선 치료(IORT)는 육안으로 치료 범위를 확인 할 수 있는 이점이 있으나 조사 선축의 각도와 치료과 치료면의 거리 등이 조금만 틀려도 조사야의 선량에 차이가 있을 뿐 아니라 조사방사선의 동질성(Homogeneity)에도 영향을 미치게 된다. 직장암의 경우 조사 부위가 대부분에서 3차적인 경사면을 가진 골반벽이 됨으로 치료 cone의 정확한 Set-up은 적절한 gantry의 회전과 치료대(treatment couch)의 tilting이 조화되어야만 가능하다. gantry의 회전은 어느 기계에서나 가능하나 치료대의 tilting은 대부분에서 불가능함으로 영남대학교 의료원 치료 방사선과에서는 상하로의 tilting이 30$ ^{\circ} $까지 가능할 뿐 아니라 기존 치료대에 장착과 탈거가 5분이내에 쉽게 될수 있는 치료대를 개발하기 위함. 재료 및 방법 : IORT 치료대는 2cm 두께의 bekelite로 2cm 두께의 sponge를 leather로 싸서 수술대에 피나 기타용액이 스며들지 못하게 하였고 전체의 무게가 45kg을 넘지 않도록 하여 치료대의 양끝에 장착할 경우, 치료대의 수평이 유지되도록 하였다. 상하 경사각은 30$ ^{\circ} $를 유지토륵 하였고 lithotomy position에서도 side handle을 사용하여 경사각 조절이 가능토록 하였다. 결과 및 결론 : 1992년 9월부터 1993년 3월까지 여러번의 수정을 거친 후 대장 직장암의 IORT에 사용하고 있으며, 3차원적인 골반벽에의 정확한 접근(approach)이 가능할 뿐 아니라 기존 방사선 치료대에 장착과 탈거가 5분 이내에 가능하며, 상하 경사각 30$ ^{\circ} $ 정도로의 조절이 수술이나 마취에 전혀 영향을 주지 않는 상태에서 자유로이 조절 되므로 향후 대장직장암의 IORT에 크게 공헌할 수 있을 것으로 사료됨.

• 대한물리의학회지
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• 제11권3호
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• pp.49-54
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• 2016

PURPOSE: This study was implemented to measure the muscle activity of muscles surrounding shoulder during push-up exercise according to the slope angle. METHODS: This study has research subject consisting of 25 normal male adults without neurologic or musculoskeletal injury in shoulder part. EMG was used as a tool for measuring muscle activity and four muscles including upper trapezius (UT), middle trapezius (MT), Lower Trapezius (LT), and Serratus Anterior (SA) were chosen for measuring the muscle activity of muscles surrounding shoulder. Tilting table slope was set at $0^{\circ}$, $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ and push-up motion was performed three time for each case to use the average value. The measured value was used after generalization process to create %RVC value where the measured value was standardized by using $0^{\circ}$ as a standard. RESULTS: There was a difference of muscle activity according to the tilting table slope during push-up exercise. In UT, MT, and SA, there was no significant $0^{\circ}$ and $30^{\circ}$, $45^{\circ}$ and $60^{\circ}$. But there was significant $30^{\circ}$ and $45^{\circ}$. LT was significant difference between $45^{\circ}$ and $60^{\circ}$ (p<.05). CONCLUSION: There are cases where push-up exercise should be selectively implemented due to shoulder problems. According to this results between $0^{\circ}$ and $30^{\circ}$, push up will be able to more effectively exercise. Applying proper angle of tilting table for push-up to patients who have difficulties in performing motions along with physical consumption can deliver effective and easy exercise program.

• 대한기계학회논문집A
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• 제29권6호
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• pp.795-803
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• 2005

This paper studies the observability of calibration system with a measurement operator. The calibration system needs a simple digital indicator to measure the mobile table movements with respect to the MC coordinate. However, it yields the concern about the poor parameter observability due to measuring only a part of the movements. We uses the QR-decomposition to find the optimal calibration configurations maximizing the linear independence of rows of an observation matrix. The number of identifiable parameter is examined by the rank of the observation matrix, which represents the parameter observability. The method is applied to a 6-axis MC with parallel tilting table and the calibration results are presented. These results verify that all necessary kinematic parameters are observable and the calibration system has robustness to the noise using optimal calibration configurations.

• 대한방사선기술학회지:방사선기술과학
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• 제44권4호
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• pp.367-373
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• 2021

A quality assurance of computed tomography(CT) have done seven items that were water attenuation coefficient, noise, homogeneity, spatial resolution, contrast resolution, slice thickness, artifact using by standard phantom. But there is no quality assurance items and methods for CT simulator at domestic institutions yet. Therefore the study aimed to access the CT dose index(CTDI), table tilting, image distortion, laser accuracy, table movement accuracy and CT seven items for CT simulator quality assurance. The CTDI at the center of the head phantom was 0.81 for 80 kVp, 1.55 for 100 kVp, 2.50 for 120 mm, 0.22 for 80 kVp at the center of the body phantom, 0.469 for 100 kVp, and 0.81 for 120 kVp. The table tilting was within the tolerance range of ±1.0° or less. Image distortion had 1 mm distortion in the left and right images based on the center, and the laser accuracy was measured within ±2 mm tolerance. The purpose of this study is to improve the quality assurance items suitable for the current situation in Korea in order to protect the normal tissues during the radiation treatment process and manage the CT simulator that is implemented to find the location of the tumor more clearly. In order to improve the accuracy of the CT simulator when looking at the results, the error range of each item should be small. It is hoped that the quality assurance items of the CT simulator will be improved by suggesting the quality assurance direction of the CT simulator in this study, and the results of radiation therapy will also improve.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.333-334
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• 2010

• 한국기계가공학회지
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• 제13권1호
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• pp.39-44
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• 2014

Techniques of tool posts are developing such that variable machining is possible using only one machine for the complication of a product's shape and to reduce the machining time. In order to develop a mill turret with a variable machining function with the mounting of mill turret units on a B-axis tilting table, we determine the static/dynamic stability of the structure of the mill turret. To this end, a static structural analysis and a modal analysis were conducted. From the results of the static structural analysis, the maximum stress was found to be less than the allowable stress. By the comparing the results of the modal analysis of the excitation frequencies of the mill turret, there were no resonance regions found. Therefore, the mill turret with the B-axis tilting facility is shown to have good structural integrity.

• 한국정밀공학회지
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• 제15권3호
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• pp.150-156
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• 1998

In this paper, a 3-DOF(Degree Of Freedom) rigid body model is developed for dynamic analysis of a hydrostatic table. The dynamic coefficients, stiffness and damping constant of each pad are calculated from the mass flow continuity condition. The validity of this model is examined in theoretical and experimental method. The dynamic behavior when mass unbalances and local variations of stiffness and damping of pads present is analyzed for real applications of hydrostatic table. Since the theoretical and experimental results show goof agreement. it can be said that the 3-DOF rigid body model is useful for the dynamic model of the table. The analysis reveals that the pitching motion is the dominant mode of vibration, It also reveals that unbalanced loads can increase amplitude of tilting motion and reduce natural frequencies and damping capacity of the hydrostatic table.