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압전감지기와 압전작동기를 이용한 보구조물의 자유진동제어에 대한 유한요소 모형화
송명관,한인선,김선훈,최창근 한국전산구조공학회 2003 한국전산구조공학회논문집 Vol.16 No.2
본 연구에서는 판형태의 압전감지기와 압전작동기가 접착되어 있는 보형태의 스마트구조물의 자유진동제어에 대한 유한요소모형화 방법을 제안한다. 압전재료의 직접압전효과와 역압전효과에 대한 구성방정식을 고려하고 변분원리를 이용하여 스마트보유한요소의 운동방정식을 유도한다. 이러한 2절점 보 유한요소근 등매개변수요소로서 Timoshenko 보이론을 기초로 한다. 따라서, 보형태의 스마트구조물을 제안하는 스마트보 유한요소에 의하여 해석함으로써 전압이 작용되는 압전작동기에 의한 구조물의 제어와 전압을 측정하는 압전감지기에 의한 구조물의 모니터링에 대한 수치적인 시뮬레이션이 가능해진다 이러한 스마트보유한요소와 Constant-gain feed back control 기법을 이용하여 압전감지기와 압전작동기를 이용한 보구조물의 자유진동제어에 대한 유한요소 모델을 제안한다 In this study, the method of the finite element modeling for free vibration control of beam-type smart structures with bonded plate-type piezoelectric sensors and actuators is proposed. Constitutive equations for the direct piezoelectric effect and converse piezoelectric effect of piezoelectric materials are considered. By using the variational principle, the equations of motion for the smart beam finite element are derived. The proposed 2-node beam finite element is an isoparametric element based on Timoshenko beam theory. Therefore, by analyzing beam-type smart structures with smart beam finite elements, it is possible to simulate the control of the structural behavior by applying voltages to piezoelectric actuators and monitoring of the structural behavior by sensing voltages of piezoelectric sensors. By using the smart beam finite element and constant-gain feed back control scheme, the formulation of the free nitration control for the beam structures with bonded plate-tyPe Piezoelectric sensors and actuators is proposed.
송명관,김세경,윤현식,권순조 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.5
The inflammatory response is an indispensable bodily reaction, but excessive inflammation is known to result in diseases such as atopic disease, bronchitis, rheumatoid arthritis, and inflammatory bowel disease. Ceramide is the basic structure of sphingolipids and ceramides have been industrially used in functional cosmetics as anti-aging agents, as well as for moisturizing skin and calming skin irritation. It also has been recently used in medicinal fields as an anti-inflammatory as well as for atopic and skin wound healing, and for skin barrier restoration. In this study, we used genetically modified Saccharomyces cerevisiae to produce ceramides. Ceramide mixture was produced by gene manipulation that amplifies the original yeast gene. To investigate their anti-inflammatory effects, nitric oxide (NO) concentrations in cell culture supernatant were measured by using the Griess reaction and the expression levels of pro-inflammatory markers, cyclooxygenase-2 (COX-2) and tumor necrosis factor-α (TNF-α), were determined by using qRT-PCR. When cells were treated with the ceramide mixture, cell viability was not reduced, but NO production was inhibited. In addition, expressions of COX-2 and TNF-α were inhibited. Based on these results, we conclude that ceramide biosynthesized from recombinant yeast can effectively reduce the expression of inflammatory enzymes and cytokines. We expected that ceramides biosynthesized in genetically modified yeast is a novel preventive or therapeutic agent for inflammatory diseases without the risk of foreign gene introduction.
송명관,신인애,류태인,갈영순,진성호,이명진 한국화상학회 2008 한국화상학회지 Vol.14 No.4
Poly(p-phenylenevinylene) (PPV)-based copolymer, poly[2-(4'-perfluorodecyl‐1H,1H,2H,2H-dimethylsilylphenyl)-1,4-phenylenevinylene-co-2-(3,7-dimethyloctyloxy)-5‐methoxy‐1,4‐phenylenevinylene] (p-RFSiPh-PPV-co-OC1C10-PPV) have been synthesized by a Gilch polymerization method. Newly synthesized copolymer is highly soluble in common organic solvents. The defect-free uniformly thin films easily formed onto the indium-tin oxide (ITO)-coated glass substrate. The resulting copolymer had high molecular weights with narrow polydispersity and high thermal stability up to 400℃. Double layer organic light-emitting diode (OLED) with an ITO/PEDOT/Polymer/Al configuration was fabricated by using the p-RFSiPh-PPV-co-OC1C10-PPV. The maximum EL emission and brightness of p-RFSiPh-PPV-co-OC1C10-PPV were observed at 588 nm and 1,640 cd/m2 at 9.6 V, respectively.
송명관,박진수,김열호,Anwarul Karim,진성호,Ryang So Ree,조영래,제갈영순,이재욱 한국고분자학회 2011 Macromolecular Research Vol.19 No.7
A new series of phenothiazine-based polymeric electrolytes were developed to obtain a high power conversion efficiency (PCE) of dye-sensitized solar cells (DSSC_s). Phenothiazine-based click polymers were synthesized using Cu(I)-catalyzed click reaction methods. The resulting polymers were soluble in common organic solvents and had a reasonable molecular weight. The thermal properties, emission spectra, and energy band gap of synthesized click polymers were also investigated. The polymer electrolytes were composed of iodide and triiodide redox species embedded in phenothiazine-based click polymers or polyacrylonitrile (PAN) as a polymer matrix. DSSCs were fabricated with a configuration of SnO_2:F/TiO_2/N719 dye/polymer electrolyte/Pt devices using these click polymers or PAN as an electrolyte components and compared photovoltaic performance. The maximum PCE of the phenothiazine-based click polymers as polymer electrolytes for DSSCs was obtained 5.30% (at 1 sun). These enhanced click polymers are expected to find applications as an electrolyte component in DSSCs in the future.
Highly transparent and conductive AgNW electrode for versatile applications
송명관 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Highly flexible transparent conducting electrodes are especially desired for the development of next generation flexible optoelectronic devices. However, indium tin oxide (ITO) films are currently adopted in those industries, the issues of cost and flexibility drive to develop alternatives. There are several emerging materials that have shown promise for the replace-ment of ITO such as carbon nanotubes (CNTs), graphene, metal nanowires, and metal mesh electrodes. Among these materials, metal nanowires have been attracting increasing attention because of its effective combination of electrical and optical properties.