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박종성(Jongsung Park),정규원(Kyuwon Jeong) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.3
The ultra-precision stage is demanded for some industrial fields such as semiconductor lithography, ultra-precision machining, and fabrication of nano structure. A new stage was developed for those applications in order to obtain nano meter resolution. This stage consists of symmetric double parallelogram mechanism using flexure hinges. The mechanical properties such as strength of the flexures and deformations along the applied force were analyzed using FEM. The stage is actuated by a piezoelectric actuator and its movement was measured by a ultra-precision linear encoder. In order to improve positioning performance, a PID controller was designed based on the identified second order transfer function. Experimental results showed that this stage could be positioned within below 5 ㎚ resolution irrespective of hysteresis and creep by the controller.
박종성 ( Jongsung Park ),김동수 ( Dong-su Kim ),김지관 ( Ji-kwan Kim ) 한국센서학회 2020 센서학회지 Vol.29 No.3
In this study, we fabricated and evaluated graphene composite based 3D scaffolds and planar films. The hybrid composite was prepared by mixing a calculated amount of graphene nanopowder and polydimethylsiloxane in tetrahydrofuran solution. The hybrid composite is easy to manufacture into various forms using direct printing technology or a pressing method. A 3D scaffold structure was prepared at ambient temperature with a flow rate of 240 mm/min. The nozzle pressure was maintained at 350 kPa by adjusting the viscosity of the composite material. The planar film was prepared at different thicknesses using a roll-to-roll equipment. The prepared hybrid nanocomposites were evaluated to investigate their electrical properties according to temperature and mechanical deformation. The obtained results were consistent with each other. Therefore, it can be used effectively as sensors through shape definition.
박종성(Jongsung Park),임철현(Cheolhyun Lim),김우람(Wooram Kim),박병욱(Byungwook Park),이진석(Jin-seok Lee),이석호(Sukho Lee) 한국태양광발전학회 2020 Current Photovoltaic Research Vol.8 No.1
In this study, we predict the generation of end-of-life photovoltaic modules when Feed in Tariff applied, in Republic of Korea. Based on the installation of photovoltaic modules, we prepared three different senarios in order to estimate the generation of end-of-life photovoltaic modules. The senarios are i) early worn-out, ii) mid worn-out and iii) late-worn out senario. We selected the mid worn-out senario to estimated the amount of end-of-life photovoltaic modules in this study. Establishment of the end-of-life module generation scenario predicted generation of end-of-life photovoltaic module, and forecasted generation amount of end-of-life module to which Feed in Tariff was applied in consideration of installed photovoltaic modules installed by Feed in Tariff support. The generation of Feed in Tariff-applied end-of-life modules increased from 2021 to 2025 compared to without Feed in Tariff, and since then, the Feed in Tariff-applied end-of-life modules were generated as waste modules during the relevant period (2021 ~ 2025).
박종성(Jongsung Park),정규원(Kyuwon Jeong) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The ultra-precision positioning system is demanded for some industrial fields, such as semiconductor lithography and fabrication of the nano structure. In this paper, the ultra-precision stage which consists of flexure hinges, piezoelectric actuator, and ultra-precision linear encoder, is designed and developed. From the step responses of the system, the system transfer function of the ultra-precision stage system was derived using system identification tool and reduced second order model system. In order to have robustness for the system uncertainty and external disturbances, the weighting functions were selected and the H∞ controller was designed using them. For the designed controller, the simulation was performed and the designed stage system was applied.
박종성(Jongsung Park),정규원(Kyuwon Jeong) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The ultra-precision positioning system is demanded for some industrial fields, such as semiconductor lithography and fabrication of the nano structure. In this paper, the ultra-precision stage which consists of flexure hinges, piezoelectric actuator, and ultra-precision linear encoder, is designed and developed. From the step responses of the system, the system transfer function of the ultra-precision stage system was derived by a second order model system. In order to have robustness for the system uncertainty and external disturbances, the weighting functions were selected and the H∞ controller was designed using them. For the designed controller, the simulation was performed and the designed stage system was applied. Experimental results found that this stage could be controlled below 5㎜ resolution and irrespective of hysteresis and creep by this designed controller.