• Journal of IKEEE
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• v.26 no.2
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• pp.249-256
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• 2022

The prosthetic leg is a device that performs walking instead of a amputated lower limb, and require a change in locomotion mode by providing the user's intention to respond to a discontinuous locomotion environment. Research has been conducted to detect the users' intentions through biomechanical features inside the socket that directly contacts the cut site in demand for natural locomotion mode changes without external control equipment. However, there is still a need for a sensor system that is suitable for the internal environment of the main body and socket of the cut site. Accordingly, this paper proposed a film-type sensor system that is suitable for the main body characteristics of the cut site, is not affected by the temperature and humidity conditions inside the socket, and is easy to manufacture in various sizes. The proposed sensor is manufactured base on Velostat film and takes into account the pressure measurement characteristics that vary with size. Through the experiment, the change in the internal pressure of the socket due to the intentional posture performance of the wearer was measured, and the possibility of detecting the intention to change the locomotion mode was confirmed.

• Journal of Aerospace System Engineering
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• v.17 no.2
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• pp.94-102
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• 2023

A nylon wire holding and release mechanism (HRM) has been widely used for deployable applications of CubeSat owing to its simplicity and low cost. In general, structural safety of solar panel with an HRM has been designed by performing structural analysis under a launch environment. However, previous studies have not performed thermal analysis for HRM in an on-orbit environment. In this study, Launch and Early Orbit Phase (LEOP) thermal analysis was performed to evaluate thermal stability of the mechanism in the orbital thermal environment of the pogo pin-based HRM applied to CubeSat. In addition, the effectiveness of the thermal design and performance of the pogo pin-based HRM were verified through a thermal vacuum test.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.345-350
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• 2002

바이오테크놀로지(BT, biotechnology)는 21세기의 첨단과학기술로서 생명공학, 생물공학, 생물이용기술 등으로 불리우고 있으며(일농기학회, 2000), 이 중 실용화되고 있는 기술중의 하나가 식물조직의 배양기술이다(백, 1993), 현재 우리나라에서는 나리, 호접란 등의 우량묘 대량증식을 위하여 조직배양기술을 이용하고 있으나 배양공정의 대부분이 인력에 의존하고 있고 배양묘 생산에 소요되는 비용의 약 60% 정도가 노동비용에서 발생되고 있다(정, 1995). 따라서 배양묘 생산의 여러 과정 중에서 수작업에 의한 작업부분을 로봇 화하여 배양묘 생산비용을 절감하려는 연구개발이 활발히 수행되고 있으며, 이중 주목을 받고 있는 것은 배양기에서 증식된 소식물체의 적출, 절단, 이식과 같은 추후의 증식과정이다 이 공정은 노동집약적일 뿐만 아니라 공정의 수작업에 따른 절단의 불균일성, 품질저하, 조작의 미숙련성, 잡균오염의 위험성 등의 문제점이 로봇화로 해결 가능하기 때문이다. (중략)

• Journal of the Korean Society for Precision Engineering
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• v.13 no.1
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• pp.123-130
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• 1996

The procedure on the design of a new tungsten cabide throw-away cutting tool system for deep grooving or cut-off machining is suggested. For relieving the maximum stress level at the corner radius of the blade holder, the finite element method is used. Also the pulling test device is proposed for measuring the holding force of the insert between the blade holder and the insert considering the materials in contact and configuration parameters of the holder.

• ICROS
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• v.21 no.2
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• pp.31-38
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• 2015

의족은 선천적 또는 후천적으로 하지의 일부를 상실한 사람의 신체를 대신하는 보조기구이며, 의족의 가장 이상적인 목표는 사람의 신체를 온전히 대체하는 것이다. 기존의 수동 의족은 신체의 구조적인 해석과 기계적인 에너지 보존을 통하여 절단 환자의 움직임을 보조하는 선에서 그쳤지만, 최근에는 로봇 공학과 반도체 공학 등 다양한 기술의 발전에 따라 의족에서도 동력을 사용하여 근육의 역할을 대신하기 위한 시도가 이루어지고 있다. 본 기술 논문에서는 하지 절단 환자를 보조하기 위한 동력 의족을 사람의 신체와 비교하여 어떤 기구적인 제약조건을 가지고 있는지 설명하고, 정상인의 보행과 동력 의족의 구동 알고리즘을 비교함으로써 동력 의족에서 사용하고 있는 유한 상태 제어기의 한계점에 대해 언급한다. 마지막으로 근전도를 활용한 동력 의족을 통해 새로이 시도되고 있는 의지적 제어에 대해 소개하고, 동력 의족의 연구가 앞으로 나아갈 방향을 제시한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.5748-5755
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• 2015

Scribing is cutting process to determine production amount and characteristic of LED chip. So it is an important process for fabrication of LED chip. Mechanical process and conventional scribing process with laser source has several problems such as thermal deformation, decreasing of material strength and limitation of cutting region. To solve these problems, internal laser scribing process that generates void in wafer and derives self-crack has been researched. However, studies of sapphire wafer cutting by internal laser scribing process for fabrication of LED chip are still insufficient. In this paper, cutting parameters were determined to apply internal laser scribing process for sapphire wafer for fabrication of LED chip. Then, foundation of cutting condition was established to set up internal laser scribing system through investigation of cutting characteristics by several experiments.

• Korean Journal of Applied Biomechanics
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• v.18 no.3
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• pp.51-59
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• 2008

The objective of this study is to kinematically analyze forehand & backhand strokes of abscission handicap wheelchair table tennis athletes. The participant of this study were picked out of national athletes who have abscission handicap. Forehand stroke movement was expected to show a throw like motion. However, external rotation and internal rotation of the right arm created a backswing and an impact. Backhand stroke was expected to show a push like motion, and as expected, proximal part of the body didn't participate in the stroke motion, but the distal part, the right arm, rotated internally to backswing and external rotated to impact to form a push like motion. Forehand swing was expected to show throw like motion according to the Link Segmental System principle. However, abscission handicap athlete didn't show clear linking structure connecting proximal and distal parts. Successful strokes were dependant only on the angle of arm rotation.

• Journal of the Korea Society of Computer and Information
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• v.27 no.4
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• pp.27-36
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• 2022

In this paper, to improve the conditions of the fish processing site, we propose a method to predict the cutting point of fish according to the target weight using AI machine vision. The proposed method performs image-based preprocessing by first photographing the top and front views of the input fish. Then, RANSAC(RANdom SAmple Consensus) is used to extract the fish contour line, and then 3D external information of the fish is obtained using 3D modeling. Next, machine learning is performed on the extracted three-dimensional feature information and measured weight information to generate a neural network model. Subsequently, the fish is cut at the cutting point predicted by the proposed technique, and then the weight of the cut piece is measured. We compared the measured weight with the target weight and evaluated the performance using evaluation methods such as MAE(Mean Absolute Error) and MRE(Mean Relative Error). The obtained results indicate that an average error rate of less than 3% was achieved in comparison to the target weight. The proposed technique is expected to contribute greatly to the development of the fishery industry in the future by being linked to the automation system.

• Proceedings of the Korean Nuclear Society Conference
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• 2001.05a
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• pp.365-365
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• 2001

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.24 no.3 s.202
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• pp.43-49
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• 2006