栗谷 理氣之妙의 現實 代案的 性格

박창용 栗谷학회 2001 율곡학연구 Vol.4 No.-

출력피드백에 의한 비매칭 불확실성이 있는 비선형계의 제어

박창용,성열완,권오규,Park, Chang-Yong,Sung, Yul-Wan,Kwon, Oh-Kyu 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8

In this paper, we design output feedback nonlinear dynamic control law by using state feedback nonlinear dynamic compensator and PI observer and show that the controller can stabilize globally and asymptotically a class of nonlinear systems with mismatched uncertainties. We also show that it is possible for a nonlinear system to use the output of PI observer in place of state variables in case that the nonlinear dynamic control law is used, similarly as in the linear system. The effectiveness of the proposed control law is demonstrated by a numerical simulation.

Thermal Decomposition of Tetrapyrazino[2,3-b]Indoloporphyrazine Films

박창용,이영희,황정욱,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Copper and metal-free tetrapyrazino[2,3-b]indoloporphyrazine films are prepared by vacuum thermal evaporation (TE) and Langmuir-Blodgett (LB) techniques. The spectroscopic properties of the thermally evaporated and Langmuir-Blodgett tetra(5-n-amyl-8-tert-butyl-2,3-pyrazino [2,3-b]indolo)porphyrazinato copper(II) and tetra(5-n-amyl-8-tert-butyl- 2,3-pyrazino[2,3-b]indolo)porphyrazine films have been investigated and compared using UV-vis, X-ray photoelectron spectroscopy (XPS), matrix-assisted laser desorption ionization time of flight (MALDI-TOF) techniques. UV-vis spectroscopy confirms decomposition of the tetrapyrazino[ 2,3-b]indoloporphyrazine``s main macrocyclic ring structure, as evidenced by the disappearance of the Q band. MALDI-TOF measures lower masses with a broader distribution for the thermally evaporated films compared to the LB films, which is caused by thermal decomposition of the tetrapyrazino[2,3-b]indoloporphyrazine molecules. This results from thermal decomposition of the phthalocyanine rings.

Fabrication and characterization of tetrapyrazinoindoloporphyrazinelangmuir-blodgett films

박창용,이영희,안수현,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

We have fabricated tetrapyrazinoindoloporphyrazine mono and multilayer films on polycrystalline gold and quartz substrates using the Langmuir-Blodgett (LB) way. XPS indicates that the atomic ratios of C, N and O for the LB films are similar to the theoretical ratios for the tetrapyrazinoindoloporphyrazine. Atomic force microscopy (AFM) reveals that the surface roughness of LB multilayer are higher than that of the LB monolayer due to aggregation of the phthalocyanine molecules in the multilayer films. The thicknesses of the tetrapyrazinoindoloporphyrazine LB monolayer are 12, 10 and 7A. In the case of 11-multilayer LB films, the thicknesses are 146, 115 and 150A. The 11-multilayer LB films are only 12, 10.5 and 21 times thicker than the monolayer LB films. This result is consistent with the surface roughness data showing aggregation of tetrapyrazinoindoloporphyrazine in multilayer LB films. UV-vis spectroscopy indicates a blue shift of the Q band of the LB films compared with the tetrapyrazinoindoloporphyrazine solution due to interaction between stacked phthalocyanine rings.

Fabrication of cobalt oxide nanostructures on graphite felt using intense pulsed light (IPL) Technique as electrode for flexible supercapacitors

박창용,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

슈퍼커패시터는 매우 빠른 충·방전 속도, 우수한 수명, 높은 안정성을 가지고 있을 뿐만 아니라 높은 출력밀도를 가지고 있어 기존 전통적인 커패시터와 배터리의 결점을 보완 할 수 있는 차세대 에너지 저장소자로 각광받고 있다. 전극 활물질로 연구되고 있는 금속산화물의 경우 기존 제작 과정에 있어 고온, 고에너지가 요구되어, 시간·비용적 저효율의 제작 공정을 가지고 있다. IPL 기술은 제논램프(xenon lamp)에서 400 nm ~ 800 nm 범위의 가시광선 영역의 복합 파장을 펄스 형태로 방출하는 것으로 상온·상압 조건에서 수 밀리초 (millisecond) 광조사를 통해 쉽고 빠르게 금속산화물을 합성할 수 있다. Graphite felt는 전기전도성, 전기화학적 안정성을 갖고 있을 뿐만 아니라 높은 다공성과 좋은 유연성 또한 갖고 있어 잘 휘어지는 의사커패시터(pseudo capacitor) 기판에 적합하다. 이에 본 연구에서는 극단파 백색광(IPL) 기술을 사용하여 잘 휘어지는 graphite felt 기판 위에 코발트산화물의 나노구조체를 합성하였다. 전극의 표면은 주사전자현미경(Field Emission Scanning Electron Microscope, FE-SEM)을 이용하여 분석하였다. 전기화학적 특성은 Cyclic Voltammetry (CV), Galvanostatic chargedischarge measurement 을 이용하여 확인 하였으며, X선회절분석법(X-ray Diffraction)을 통하여 합성된 코발트 산화물의 결정 구조를 분석하였다.

북미 냉동/냉장 쇼케이스 관련 연구 소개

박창용 대한설비공학회 2011 설비저널 Vol.40 No.6

Vapor sensing properties of ω-(N-pyrrolyl) alkanethiol-protected gold nanoparticle films

박창용,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

금 나노입자는 우수한 광학적 특성, 높은 전기전도성 등으로 인해, organic photovoltaics, sensor probes, drug delivery, electronic conductor 등 첨단 분야에서 응용되어 지고 있다. 뿐만 아니라 금은 화학적으로 8족의 원소들 중 가장 안정한 금속이며, 산화에 대한 큰 저항성을 가지고 있다고 알려져 왔으나 1970년대 말, 금 나노입자가 높은 분산도로 담지되면 다양한 반응에 활성을 가지는 것으로 밝혀져 현재 다양한 분야에서 연구되어 오고 있다. 특히, 금 나노입자는 센서 소재로서 높은 민감도와 넓은 선택도, 그리고 빠른 가역성을 가지고 있어서 다양한 가스를 검출하는 센서로 폭넓게 사용되어 왔다. 금 나노입자를 사용한 센서 시스템은 일반적으로 전기적 저항 측정에 기반을 두고 있으며 유기용매 기체에 노출되었을 때 전기적 저항이 변화한다고 알려져 있다. 이러한 저항값의 변화는 금 나노입자의 유전 상수값 및 금 나노입자 사이의 거리와 밀접한 관련을 지닌다. 본 연구에서는 리간드의 주쇄 길이를 달리한 피롤과 메틸기를 말단기로 가지는 금 나노입자를 각각 4가지를 합성하여 포토 리소그래피를 사용하여 패턴된 IDA전극 위에 필름 형태로 제작한 후 유기용매 기체에 노출시켰을 때 센싱 특성을 관찰하여 비교하고 분석하였다.

Change of Thermal Conductivity and Cooling Performance for Water Based Al2O3-Surfactant Nanofluid with Time Lapse

박창용,김만배,박홍근 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.1

An experimental research was performed to study the effect of time lapse on the change of water-Al2O3 nanofluid thermal conductivity and its convection heat transfer. The size of Al2O3 nanoparticle size was 20 nm and 70 nm, and initial volumetric concentration range was from 0.5% to 3%. A surfactant was added to the nanofluid and the change of thermal conductivity and convection heat transfer was also measured. The surfactant was Sodium Dodecyl Benzene Sulfonate (SDBS) and its mass fractions in the nanofluid were from 0.5% to 3.0%. Thermal conductivity of water and nanofluid was measured by the transient hot wire method. The accuracy of the measurement method was confirmed by the measurement error with 0.92% for distilled water at 20 ∘ ∘C. The thermal conductivity of the nanofluid without SDBS increased up to 11.3% and the enhancement decreased with time lapse. The reduction of thermal conductivity enhancement with the time lapse could be retarded by the addition of SDBS and its effect became higher with the increase of its mass fraction. The convection heat transfer characteristics of the nanofluid was measured in a small cooling system. Compared with pure water, nanofluid convection heat transfer could be enhanced but higher pressure drop also occurred. Compared with the convection heat transfer enhancement for the nanofluid without SDBS, the addition of SDBS decreased the enhancement at the initial stage of the experiment, but it could retard the reduction of convection heat transfer with time lapse.

Sythesis of PNIPAm-grafted silica Particles

박창용,이영호,오성근 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.1

최적 TiO2 전극 두께 및 광산란 증가에 의한 염료감응형 태양광전지의 효율 개선

박창용,권현규,우증연 한국반도체디스플레이기술학회 2014 반도체디스플레이기술학회지 Vol.13 No.2

In this study, the performance of dye-sensitized solar cells with different thickness of the photelectrode film was simulated by using the electron-diffusion differential model. Through this simulation, the relationships between the thickness of the photoelectrode film and the performances (open-circuit voltage, short-circuit current density, and overall photoelectric-conversion efficiency) of cells were understood and the performances with different thickness of the photoelectrede film were also examined. For considering the refractive index in the liquid electrolyte and exploring the scattering effect of titanium dioxide particles with different sizes using the Mie light-scattering theory, the highest scattering effect of each particles was found out and the optimal size of the titanium dioxide particle was determined for light scattering in the photoelectrode film of dye-sensitized solar cell. Through experiment, the mixed titanium dioxide cell was better than the single titanium dioxide cell and generated a higher overall conversion efficiency because the optimal titanium dioxide particles in the phoelectrode film as light scattering.