• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.29-32
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• 2018

본 논문에서는 IR-UWB(Impulse-Radio Ultra Wideband) 레이더와 서보 모터를 이용한 실내 환경의 물체 위치(거리, 각도) 탐지 방법을 제안한다. 기존의 카메라나 적외선을 사용한 기술은 비용이 비싸고 장애물이 있을 시 측정이 어려워 정확도가 떨어지는 단점을 가지고 있다. 반면 IR-UWB 레이더는 저 전력, 저 가격, 소형으로 구현이 가능하고 광대역을 사용하여 투과성이 좋다는 장점을 가져 실내 환경의 물체 움직임 탐지에 적합하다. 하지만 IR-UWB 레이더를 이용한 물체 탐지 시 각도 측정 없이 거리만을 측정하기 때문에 물체의 정확한 위치를 탐지할 수 없다. 이러한 점을 보완하고자 레이더를 모터 위에 설치하고 모터를 180 도 회전시키는 방법을 사용함으로써 넓은 측정 범위를 가짐과 동시에 물체의 위치를 보다 정확히 탐지해내는 결과를 보였다.

• Journal of the Korean Society for Nondestructive Testing
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• v.29 no.5
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• pp.421-426
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• 2009

The emissivity is different because the emitted angle changes according to the position of the infrared thermography camera and object. Because of this, the temperature distribution expressed when measuring the temperature by using the infrared thermography system is not the accuracy temperature. Although the real surface temperature is constant, the temperature measured by using infrared thermography camera have error in accordance with the value of emissivity. In this paper, the temperatures of the round cylindrical object and the flat square object that heated to the equal temperature were measured by infrared thermography camera. The emissivity calibration formula and correction table are made with the affect of the view angle and emission angle form the surface temperature value. The error of measured temperature values are corrected by using the emissivity calibration formula and correction table, and apply to defect detection of the nuclear power plant pipe. From the calibration method, reliability surface temperature values were obtained.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.8 no.3
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• pp.197-203
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• 2014

In this paper, we develop an attachable head of bed(HOB) monitoring system, which can prevent ventilator associated pneumonia(VAP), and analyze the performance of the developed HOB monitoring system. The main purpose of the HOB monitoring system is to support visible HOB display for keeping patients' position effectively and collect data for analysis of the relation between HOB elevation and patients' symptom. The HOB monitoring system is developed in attached-type and uses an FIR filter with heuristic logic to remove the unwanted noise. The optical encoder is used for the performance analysis of the developed HOB monitoring system.

• Journal of Digital Convergence
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• v.16 no.8
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• pp.301-309
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• 2018

The purpose of this study was to investigate the immediate effect of lumbar support and ischial pad on neck, trunk angle and chest expansion for stroke patients using wheelchair. Fifteen stroke patients were measured repeatedly when a lumbar support using(L support), a Ischial pad using(I Pad), a Lumbar support with ischial pad using(L With I), and non using it(Non using). The measurement of the neck and trunk angle was confirmed using a mobile phone camera, and chest expansion was performed using a tapeline. L With I increased significantly in neck and trunk angle and lower chest expansion than non using. This study shows that simultaneous use of lumbar support and ischial pad for stroke patients using wheelchair can increase the neck and trunk angle, chest expansion immediately. Future studies will need to identify more long-term changes by continuing intervention with more subjects.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.2
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• pp.165-170
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• 2012

This paper contains the test method to obtain aerodynamic hinge moments acting on the control surface of air vehicle wing. During the flight, hinge moments make difference between actual control surface angle and control angle which is measured by sensor of actuator. The hinge moments can be obtained by using this difference. Static ground load test and calibration test were conducted to obtain torsional stiffness of control surface actuation system. This results are used to calculate hinge moments. In addition, the mechanical errors of actuation system such as slip angle of mounting point and backlash could be estimated. Using flight test results, this experimental measurement method of hinge moment acting on control surface is conducted. The results of this method are similar to those of numerical simulation method, and the validity of this method is proved.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.6
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• pp.123-130
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• 2014

In this study, a vision-based displacement measurement system is developed to accurately measure the displacement of a structure with locating the camera at arbitrary position. The previous vision-based system brings error when the optical axis of a camera has an angle with the measured structure, which limits the applicability at large structures. The developed system measures displacement by processing the images of a target plate that is attached on the measured position of a structure. To measure displacement regardless of the angle between the optical axis of the camera and the target plate, planar homography is employed to match two planes in image and world coordinate systems. To validate the performance of the present system, a laboratory test is carried out using a small 2-story shear building model. The result shows that the present system measures accurate displacement of the structure even with a camera significantly angled with the target plate.

• Journal of the Korea Convergence Society
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• v.11 no.5
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• pp.81-86
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• 2020

The Purpose of this study is analysis characteristic of grasping power with each different shoulder horizontal angle. Twenty female university students with no shoulder dysfuction participated subject in three different positions of shoulder horizontal flexion with standing posture, shoulder 0° flexion, elbow 90° flexion, forearm 90° pronation, different positions is followed : shoulder 0° horizontal adduction shoulder 40° horizontal adduction, shoulder 40° horizontal abduction. The One-way repeated ANOVA test was used to determine the different in grip strength on three shoulder horizontal positions. On the average, in the hand grip strength, the horizontal neutral position is higher than horizontal adduction position with significant value. In particular, shoulder horizontal aduction was measured lowest grip strength between three positions.

• The korean journal of orthodontics
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• v.2 no.1
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• pp.29-34
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• 1971

저자는 교정환자 치료에 흔히 사용되는 Light wire torquing auxiliary의 반경의 크기 및 교합면에 대한 spur 각도의 증감에 따라 Light wire torquing auxiliary 애서 발생되는 힘이 어떻게 변화하는 가를 Dentiform typodont 위에서 측정 관찰하여 아래와 같은 결과를 얻었다. 1) Light wire torquing auxiliary circle의 반경의 크기가 감소할 수록 발생되는 힘의 크기는 증가하였으나, 반경의 크기에 반비례하지는 않았다. 즉, Light wire torquing auxiliary circle의 반경을 20 mm.에서 10mm.로 하였을때 발생되는 force는 2배로 나타나지는 않았다. 2) 교합 평면에 대한 spur의 각도가 감소할 수록 force는 증가하였다. 이때 교합 평면에 대한 spur의 각도를 감소시킨 상태에서 교합 평면과 치아가 이루는 각도를 증가시켜 줌으로써 항속적인 힘의 증가를 나타냈다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2465-2467
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• 2003

최근 광섬유와 일반 통신 선로 사이의 인터페이스인 레이저 펌프(laser pump)와 같은 광 부품의 수요가 늘어나고 있다. 그러나 대부분의 광 부품 조립은 수작업으로 이루어지고 있기 때문에 한명의 전문가가 하루에 조립할 수 있는 광 부품의 수는 많지 않다. 따라서 이러한 광 부품의 대량생산을 위해서는 광 부픔 제작 과정의 자동화가 이루어져야 한다. 본 논문에서는 980nm 레이저 펌프 조립 과정에서 광섬유 끝단 렌즈의 각도 조절을 자동화하기 위한 비젼 기반의 앵글 튜닝 알고리듬을 제안한다. 제안된 알고리듬은 입력된 영상으로부터 광섬유 끝단 렌즈의 하단 영역의 넓이를 이용하여 광섬유의 각도를 측정하고, 광섬유를 회전시키면서 변화하는 각도 값을 이용하여 광섬유를 원하는 각도로 튜닝 한다.

• Journal of the Korean Society of Radiology
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• v.10 no.6
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• pp.435-442
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• 2016

This study was an investigation of the anode heel effect caused by changing the angle of the x-ray tube. We established the following conditions for experimental measurements: 70 kV, 30 mAs, focus-detector distance of 100cm, and a collimator setting of $35{\times}43cm^2$. The measurement points were set up at the center of the collimator and extended to each side in intervals of 3.5cm, with points A1, A2, A3, A4, A5, A6 on the anode side and points C1, C2, C3, C4, C5, C6 on the cathode side. We measured the entrance surface dose from point A6 to point C6 with each point perpendicular to an x-ray tube. And we did the same when measuring different angles of the x-ray tube from 15 to 30 degrees for every point on the anode and cathode sides. Using perpendicular x-ray tube, we found that the entrance surface dose of the A5 point was three times higher than that of the C5 point. Thus, we conclude that if the anode side is placed near highly radiosensitive organs, then there will be less radiation exposure when using a perpendicular x-ray tube. When imaging using x-ray tube angles, an angle to the cathode side can reduce the gap of the entrance surface dose on both the anode and cathode sides. When imaging areas where there are differences in thickness between the upper and lower sides, the angle to the cathode side that is closer to the thicker area can reduce the gap of the entrance surface dose and capture a higher quality image.