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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.
임효준(Hyo Joon Lim),이주경(Ju Kyoung Lee),황준현(Jun Hyeon Hwang),이경창(Kyung Chang Lee),이석(Suk Lee) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.6
Unlike household refrigerators, commercial refrigerators are composed of separate indoor and outdoor units. The outdoor unit of most commercial refrigerators is designed to run at a fixed speed, which results in low energy efficiency and loud fan noise. Moreover, it cannot respond flexibly to changing thermal load in the indoor unit. Inverter type outdoor units can address such problems through speed changes based on information obtained from the indoor unit. However, using two units from different manufacturers is often not a viable solution. If condition changes in the indoor unit can be detected without communication between the two units, it is possible to adjust the speed of the outdoor unit. This paper attempts to analyze the signal from the outdoor unit when the condition of the indoor unit changes by varying the thermal load.
서지원(Ji Won Seo),이주경(Ju Kyoung Lee),이석(Suk Lee),이경창(Kyung Chang Lee) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.2
In this paper, we design a gripping force control system using tactile sensor to prevent slip when gripper tries to grasp and lift an object. We use a flexible tactile sensor for measuring uniplanar pressure on grippers finger and develop an algorithm to detect the onset of slip using the sensor output. We also use a flexible pressure sensor to measure the normal force. In addition, various signal processing techniques are used to reduce noise included in the sensor output. A 3-finger gripper is used to grasp and lift up a cylindrical object. The tactile sensor is attached on one of fingers, and sends output signals to detect slip. Whenever the sensor signal is similar to the slip pattern, gripper force is increased. In conclusion, this research shows that slip can be detected using the tactile sensor and we can control gripping force to eliminate slip between gripper and object.
3D 프린팅 방법으로 제작된 유연 촉각센서의 출력 특성 분석
진승호(Seung Ho Jin),이주경(Ju Kyoung Lee),이석(Suk Lee),이경창(Kyung Chang Lee) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.2
Flexible tactile sensors can provide valuable feedback to intelligent robots about the environment. This is especially important when the robots, e.g., service robots, are sharing the workspace with human. This paper presents a flexible tactile sensor that was manufactured by direct writing technique, which is one of 3D printing method with multi-walled carbon nano-tubes. The signal processing system consists of two parts: analog circuits to amplify and filter the sensor output and digital signal processing algorithms to reduce undesired noise. Finally, experimental setup is implemented and evaluated to identify the characteristics of the flexible tactile sensor system. This paper showed that this type of sensors can detect the initiation and termination of contacts with appropriate signal processing.
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.
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.
정종만(Jong Man Joung),강병권(Byoung-Gwon Kang),허정훈(Jung-Hoon Hur),이주경(Ju kyoung Lee),이춘권(Chun-Kwon Lee) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
주상변압기의 상 불균형 및 상태 이상을 3축 진동 센서를 이용하여 추정하고 이를 주파수 특성에 기반하여 각 상태를 분류하였다. 이를 위하여 3차원 공간에 3축 주파수 고조파 특성값들에 대하여 벡터 밀도기반 클러스터링 기법을 사용하였다.