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표면 알킬기를 갖는 실리콘 나노입자의 One-Pot 용액환원 합성
윤태균 ( Tae Gyun Yoon ),조미경 ( Mi Kyung Cho ),선양국 ( Yang Kook Sun ),이정규 ( Jung Kyoo Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
Silicon nanoparticles have attracted a great deal of scientific interests due to its intense photoluminescence in the visible spectral region and its potential applications in biological fluorescence maker, RGB (red, green, blue) display, photonics and photovoltaics etc. Practical applications making use of optical and physicochemical properties of Si nanoparticles requires an efficient synthetic method which allows easy modulation of their size, size distribution as well as surface functionalities etc. In this study, a one-pot solution reduction scheme is attempted to prepare alkyl-terminated Si nanoparticles (<10 nm) with Si precursors, (Octyl)SiCl3 or mixture of(Octyl)SiCl3 and SiCl4, containing alkyl-groups using Na(naphthalide) as reducing agent. The surface capping of Si nanoparticles with octyl-groups as well as Si nanoparticle formation was achieved in one-pot reaction. The hexane soluble Si nanoparticles with octyl-termination were in the range of 2-10 nm by TEM and some oxide groups (Si-O-Si) was present on the surface by EDS/FTIR analyses. The optical properties of Si nanoparticles measured by UV-vis and PL evidenced that photoluminescent Si nanoparticles with alkyl-termination was successfully synthesized by solution reduction of alkyl-containing Si precursors in one-pot reaction.
윤태균(Tae Gyun Yoon) 한국항공우주학회 2017 한국항공우주학회 학술발표회 논문집 Vol.2017 No.4
도립진자(Inverted Pendulum)란 질량 중심이 회전 중심의 연직 위에 존재하는 진자로써, 예로부터 여러 가지 제어 이론들을 테스트하고 검증하는데 있어서 널리 이용되어 왔다. 본 연구에서는 도립진다 자체의 제어와 기존 PID 제어기가 갖고 있는데 외란에 대한 한계를 관측기(Disturbance Observer) 이론과 접목하여 그 한계를 극복함을 목표로 한다. 본 연구에서는 외란이 여러 가지 파동 함수들의 중첩으로 형성 되었다고 가정하고, 시뮬레이션을 통하여 외란의 극복 가능성을 확인하였다. Inverted pendulum is a pendulum that has its center of mass above its center of rotation. Inverted pendulum has been widely used as a benchmark for testing control algorithms. The first goal of this research is to control the inverted pendulum itself against various disturbance existing in real world by using the PID control algorithm. Furthermore, to address the limitation of PID control under various disturbance, we suggest to combine it with disturbance observer. In this research, control plant and disturbance are implemented for simulation, and disturbances are assumed to superposition of many wave functions.
베트남 기후 및 경제적 여건을 고려한 건물에너지 패키지 적용에 따른 건물에너지 절감효과 분석
윤태균(Yun Tae Gyun),신재윤(Shin Jae Yoon),강석표(Kang Seok-pyo) 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.5
Due to the construction industry, the increase in energy demands from the population, and economic growth in Vietnam, the need for energy efficient buildings has increased. An analysis of Vietnam’s regulations and standards related to building energy shows that Vietnam’s current technology level is similar to Korea in the 1980s, so it needs to upgrade its technology. Using Korea’s advanced energy efficient building technology, it will be possible to satisfy Vietnam’s need for energy efficient buildings. In a prior study, the baseline data were calculated using a building energy simulation program with Vietnam’s weather data and input values provided by the most recent Vietnam building energy standards (QCVN 09:2017:BXD). Then, the optimized input combination of building energy packages was derived to achieve energy savings of 60% by integrating the building energy simulation program (Energyplus) with a programming language (Python). Vietnam’s climate characteristics vary by region, so simulations were run with three sets of weather data (Northern: Hanoi, Central: Da Nang, Southern: Ho Chi Minh). As a result, the optimized input combination could reduce building energy usage by about 55% compared to the baseline model. In this study, building energy savings were analyzed using simulated data by modeling a real example building in Vietnam before the building energy package was installed.