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DED 금속 3차원 프린팅의 레이저 파워 피드백 제어에 따른 적층 물성 연구
김지언(ChiYen Kim),김지성(JiSung Kim),이호(Ho Lee),박민규(MinKyu Park),김성욱(SungWook Kim),신성선(SeongSeon Shin),황준호(JunHo Hwang),김현덕(HyunDeok Kim) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.2
This study conducted a comparative analysis of laser power feedback control by measuring the melting pool size and temperature in the Directed Energy Deposition (DED) of SUS316L, to identify the effect of a conventional melting pool monitoring system on 3D metal printing performance. In the study, a CLAMIR was used on a developing 3D metal printer to control the laser beam power by measuring the size and temperature of the melting pool using an IR camera. Test parts were built from same CAD model but under different conditions, specifically, with CLAMIR on and off. The parts were investigated three ways: by 3D scanning to measure geometric errors, CT scanning to look into pore creation and distribution, and tensile tests to analyze mechanical performance.
미분탄 화염 영상 분석을 통한 취입랜스 최적 제어 기법 개발
김지언(Chiyen Kim),이민철(Mincheol Lee),백준영(Junyoung Baek),정도영(Doyoung Jeong),안영진(Youngjin Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.
황선민(Hwang Sun Min),김지언(Kim chiyen),이민철(Lee Min Cheol) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.1
The surgical robot instrument looks like a long cylinder with small diameter which is suitable to small invasive surgery able to decrease the amount of healthy tissue damaging. The shape of the surgical robot instrument restricts the power transmission and so only the cable-driven mechanism is adoptable to the robot However cable has elastic characteristic and pulleys have inertia and friction, cable-driven mechanism becomes higher nonlinear system‘ This paper applies a robust motion control algorithm to overcome the nonlinearity problem. To overcome the nonlinearity of the robot, this paper uses a sliding mode control with sliding perturbation observer (SMCSPO), as robust control algorithm. This controller uses not only state observer but also perturbation observer which involves the system nonlinearities in the surgical robot instrument. Therefore this paper proposes to use the controller which adopts two observers specialized to nonlinear system as the surgical robot instrument. In this paper, the control ecnamrofrep of the proposed algorithm is evaluated by the simulation applied to a three-degree-of-freedom (DOF) surgical robot instrument. The results show high accuracy and good performance.
3차원 프린팅을 이용한 무선전력전송의 안테나 설계 특성 규명
김지성(Ji-Sung Kim),박민규(Min-Kyu Park),이호(Ho Lee),김지언(Chiyen Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.8
The 3D printing of electronics has been a major application topics in additive manufacturing technology for a decade. In this paper, wireless power transfer (WPT) technology for 3D electronics is studied to supply electric power to its inner circuit. The principle of WPT is that electric power is induced at the recipient antenna coil under an alternating magnetic field. Importantly, the efficiency of WPT does rely on the design of the antenna coil shape. In 3D printed electronics, a flat antenna that can be placed on the printed plane within a layer of a 3D printed part is used, but provided a different antenna response compared to that of a conventional PCB antenna for NFC. This paper investigates the WPT response characteristics of a WPT antenna for 3D printed electronics associated with changes in its design elements. The effects of changing the antenna curvature and the gap between the wires were analyzed through experimental tests.
Chaima Fekiri(페키리샤이마),Ho-Chan Kim(김호찬),Chiyen Kim(김지언),In Hwan Lee(이인환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Carbon nanotubes have great potential in electronic and sensory applications due to their excellent electrical and mechanical properties. They have been used in various fields of research to reinforce matrix materials to enhance their mechanical, thermal, and electrical properties. On the other hand, a significant interest in the printed electronics had become evident in the past few years where additive manufacturing is utilized for the extrusion of the sensing material. In this study, we developed a fully printed flexible piezoresistive tactile sensor using multi-walled carbon nanotubes (MWCNT) as fillers for a polymeric matrix (PDMS). The sensing part is a 3-dimensional disc printed with direct ink process on top of a silver ink electrode which was also extruded using the same process. Compared to our previously reported design, this design allowed the decrease of the initial electrical resistance of the sensor without modifying the preparation process of the MWCNT-PDMS composite.
허정훈(Heo Jung Hun),황선민(Hwang Sun Min),김지언(Kim chiyen),이민철(Lee Min Cheol) 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.1
군집 로봇 시스템에서는 다수 다종의 무인로봇이 동시에 주어진 과제를 수행하므로, 각자의 로봇들은 주위의 다른 로봇들과 협조하여야만 주어진 일을 효율적으로 수행할 수 있다. 따라서 개개의 로봇은 서로의 위치를 파악하면서 과제를 수행하여야 한다. 본 논문에서는 다수의 UGV/UAV가 서로 충돌을 피하연서 최적의 경로를 따라 이동할 수 있도록 하는 여러가지 기동간 군집로봇 제어 알고리즘을 소개하고 장단점을 비교하며 지역탐색이나 구조, 무인전투체계등의 응용방안에 대해 제안한다.