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이주경(Ju-Kyoung Lee),이종항(Jong-Hang Lee),박철우(Cheol-Woo Park),조웅식(Woong-Sick Cho) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.11
Micro-EDM technology for the manufacture of miniature parts is used to make a micro hole. Two electrode shaping methods, mechanical electrode grinding and WEDG technique, have been studied. In this study, an electrode shaping method by using previously machined hole is introduced in order to obtain an optimal holemaking condition. Key factors such as applied voltage, capacitance, feedrate, and hole-dimension have an influence on the fabricating error of electrode shaping, which are taper ratio of a hole, electrode form accuracy, and electrode surface. Therefore, we try to investigate the optimal fabricating of electrode shaping from various experiments. Results from experiments, it was able to minimize the electrode fabricating error as voltage increases, and also applied feedrate and capacitance decreases.
이동엽(Dong-Yeop Lee),이주경(Ju-Kyoung Lee),박미르(Mir Park),최재명(Jae Myeong Choi) 한국디지털콘텐츠학회 2022 한국디지털콘텐츠학회논문지 Vol.23 No.10
3D content can produce high-quality content through the development and convergence of various technologies, and production time has been greatly reduced. However, in order to produce high-quality content, it takes a lot of time to create it through modeling, rendering, and animation processes that give it a sense of reality. In addition, in a web environment, a transmission delay may occur when a large amount of 3D data is transmitted. Therefore, this study proposed a method to improve loading speed by processing water, land, and altitude data, which are the main components of the 3D map, to improve web 3D GIS rendering performance. In addition, performance was analyzed using a Web Worker after measuring FPS for each number of 3D objects.
3D 프린팅 방식 유연 촉각센서의 접촉력 측정 알고리즘 개발
정경화(Kyeong-Hwa Jeong),이주경(Ju-Kyoung Lee),이석(Suk Lee),이경창(Kyung-Chang Lee) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.6
Flexible tactile sensors can provide valuable feedback to intelligent robots regarding the environment around them. This is especially important when robots such as, service robots share a workspace with humans. This paper presents a contact force measurement algorithm of a flexible tactile sensor. This sensor is manufactured by a direct-writing technique, which is one 3D printing method, using multi-walled carbon nano-tubes. An analog signal processing circuit has been designed and implemented to reduce noise contained in the sensor output. In addition, a digital version of the Butterworth filter was implemented by software running on a microcontroller. Through various experiments, characteristics of the sensor system have been identified. Based on three traits, an algorithm to detect the contact and measure the contact force has been developed. The entire system showed a promising prospect to detect the contact over a large and curved area.
신유영(Yu-Yeong Sin),김슬기(Seul-Ki Kim),이주경(Ju-Kyoung Lee),이석(Suk Lee),이경창(Kyung-Chang Lee) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.5
This paper introduces a resistance scanning-type flexible tactile sensor for intelligent robots and presents the output characteristics of the sensor via signal processing. The sensor was produced via the lamination method using multi-walled carbon nanotubes (a conductive material), an insulator, and Tango-plus (an elastic material). Analog and digital signal processing boards were produced to analyze the output signal of the sensor. The analog signal processing board was made up of an integrator and an amplifier for signal stability, and the digital signal processing board was made up of an IIR filter for noise removal. Finally, the sensor output for the contact force was confirmed through experiments.