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Norbornene Dialkyl Ester가 첨가된 PVC의 물성 연구
윤대희 ( Dae Hee Yun ),고태원 ( Tae Won Ko ),우제완 ( Je Wan Woo ) 한국공업화학회 2014 공업화학 Vol.25 No.6
In this study, we observed changes in the physical properties of norbornene dialkyl ester applied to a PVC. The PVC specimens were prepared by blending PVC, norbornene dialkyl ester and stabilizers. Then, the hardness, tensile strength, elongation, tearing strength, transmittancy, haze and yellowness index of these specimens were measured, and were compared with DOP. The hardness of compounds except dicyclohexyl-5-norbornene-2,3-dicarboxylate (DCHN) were an equal to or higher than that of DOP. The tearing strength and tensile characteristic of DCHN could not be analyzed due to its high hardness. Tensile properties such as the tensile strength and elongation were improved for six compounds except diisononyl- 5-norbornene-2,3-dicarboxylate (DINN). All compounds measured showed better tearing strength and transmittancy than those of DOP. Also all norbornene derivatives except DDN showed good haze indices. The yellowness index of DON and DPN showed similar values as DOP.
Phenothiazine과 2,1,3-Benzothiadiazole을 포함한 Copolymer의 합성 및Side-chain 치환에 따른 Photovoltaic 특성 연구
윤대희 ( Dae Hee Yun ),유한솔 ( Han Sol Yoo ),성기호 ( Ki Ho Seong ),임정호 ( Jeong Ho Lim ),박용성 ( Yong Sung Park ),우제완 ( Je Wan Woo ) 한국공업화학회 2014 공업화학 Vol.25 No.5
In this study, three kinds of polymers based on phenothiazine-benzothiadiazole were synthesized by a Suzuki coupling reaction, and the various side-chains were substituted at the nitrogen of phenothiazine. The optical and electrochemical properties of synthesized polymers were analyzed. The results indicate that their absorption ranged from 300 to 700 nm, and alsoconfirmed the ideal highest occupied molecular orbital (HOMO) energy level was about -5.4 eV with low band-gap energy. Photovoltaic devices were fabricated using a photoactive layer composed of a blended solution of the polymer and PC71BMin ortho-dichlorobenzene The device with P2HDPZ-bTP-OBT containing the branched side-chain and long chain showed the best performance; the maximum power conversion efficiency of this device was 2.4% (with VOC : 0.74 V, JSC : 6.9 mA/cm2,FF : 48.0%).
박영철,윤정현,윤대희,차일환,Park, Young-Cheol,Yun, Jeong-Hyeon,Youn, Dae-Hee,Cha, Il-Whan 한국음향학회 1996 韓國音響學會誌 Vol.15 No.2
본 논문에서는 일차원 밀폐함 내의 광대역 소음을 제어하기 위한 에너지 밀도(energy density)제어 알고리듬의 성능을 평가한다. 주파수 영역에서 최적 능동 소음 제어 필터를 설계할 경우 종종 시간 영역에서 물리적으로 실현할 수 없는 결과를 얻게 된다. 이런 문제를 피하기 위해 본 논문에서는 시간 영역에서 문제를 해석한다. 이러한 접근 방법은 항상 물리적으로 실현 가능한 최적 제어기를 얻을 수 있게 해준다. 능동 소음 제어 시스템의 성능을 예측하기 위해 실시간 모의 실험 결과로부터 음압을 최소화 하는 것보다 에너지 밀도를 최소화 하는 것이 광대역 소음의 전역적인 감쇠(global attenuation)에 있어서 향상된 결과를 얻을 수 있음을 확인할 수 있다. 또한 특정 지점에서, 검출된 에너지 밀도를 최소화할 경우 밀폐함 내에 있는 위치 에너지를 최소화하는 방법에서 얻을 수 있는 결과와 유사한 정도의 소음 전역 감쇠를 얻을 수 있었다. 그리고 음압 자승 제어 방법과는 달리 에너지 밀도 제어 방법은 일차원 음장에서 사용하는 경우 오차 센서의 위치에 영향을 받지 않음을 알 수 있다. 본 논문은 또한 에너지 밀도 제어 알고리듬의 실제 구현시에 일반적으로 사용되는 두 개의 센서를 사용하는 구현 기술을 살펴보고, 이 기술이 큰 성능 저하 없이 에너지 밀도 제어 알고리듬을 구현할 수 있음을 보인다. The performance of the energy density control algorithm for controlling a broadband noise is evaluated in a one-dimensional enclosure. To avoid noncausality problem of a control filter, which often happens in a frequency domain optimization, analyses presented in this paper are undertaken in the time domain. This approach provides the form of the causally constrained optimal controller. Numerical results are presented to predict the performance of the active noise control system, and indicate that imp개ved global attenuation of the broadband noise can be achieved by minimizing the energy density, rather than the squared pressure. It is shown that minimizing the energy density at a single location yields global attenuation results that are comparable to minimizing the potential energy. Furthermore, unlike the squared pressure control, the energy density control does not demonstrate any dependence on the error sensor location for this one-dimensional field. A practical implementation of the energy-based control algorithm is presented. Results show that the energy density control can be implemented using the two sensor technique with a tolerable margin of performance degradation.
Benzothiadiazole-benzodithiophene을 기반으로 한 D/A구조의 공액 고분자 합성 및 광전변환 효율 특성 개선 연구
성기호 ( Ki Ho Seong ),윤대희 ( Dae Hee Yun ),우제완 ( Je-wan Woo ) 한국공업화학회 2013 공업화학 Vol.24 No.5
In this study, the push-pull structure polymer for organic photo voHaics (OPVs) was synthesized and characterized. The poly{4,8-didodecyloxybenzo[1,2-b;3,4-b]dithiophene-alt-5,6-bis(octyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole} (PDBDT-TBTD) was synthesized by Stille coupling reaction using the benzothiadiazole (BTD) derivative as an electron acceptor and benzodithiophene (BDT) derivative as an electron donor. The structure of monomers and polymers was identified by 1H-NMR and GC-MS. The optical, physical and electrochemical properties of the conjugated polymer were identified by GPC, TGA, UV-Vis and cyclic voltammetry. The number average molecular weight (Mn) and initial decomposition temperature (5% weight loss temperature, Td) of PDBDT-TBTD were 6200 and 323 ℃, respectively. The absorption maxima on the film was about 599 nm and the optical band gap was about 1.70 eV. The structure of device was ITO/PEDOT : PSS/PDBDT-TBTD : PC71BM/BaF2/Ba/Al. PDBDT-TBTD and PC71BM were blended with the weight ratio of 1:2 which were then used as an optical active layer. The power conversion efficiency (PCE) of fabricated device was measured by solar simulator and the best PCE was 2.1%.
Push-pull 구조의 공액 고분자 합성 및 Phenothiazine의 질소 원자에 치환된 Side-chain에 따른 유기박막태양전지로의 특성 연구
성기호 ( Ki Ho Seong ),윤대희 ( Dae Hee Yun ),우제완 ( Je Wan Woo ) 한국공업화학회 2014 공업화학 Vol.25 No.6
In this study, a new series of conjugated polymer 3-(5-(5,6-bis(octyloxy)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen- 2-yl)-10-(4-(octyloxy)phenyl)-10H-phenothiazine (P1) and 3-(5-(5,6-bis(octyloxy)-7-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol- 4-yl)thiophen-2-yl)-10-(4-((2-ethylhexyl)oxy)phenyl)-10H-phenothiazine (P2) were synthesised and organic photovoltaics (OPVs) properties were characterized. The push-pull structure polymer consisted of phenothiazine derivative as an electron donor and benzothiadiazole derivative as an electron acceptor. The aliphatic chain substituted aromatic ring was substituted at the position of N in phenothiazine for the electron-rich and improved solubility. Excellent thermal stabilities of P1 and P2 were confirmed by measured Td values as 321.9 and 323.7 ℃, respectively and the degrees of polymerization were 4,911 (P1) and 5,294 (P2). The maximum absorption wavelength of P1 and P2 were 549 and 566 nm, respectively. The device was fabricated and the OPVs property was measured. As a result, the power efficiency of conversion for P1 and P2 were 0.96 and 0.90%, respectively.