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이원문,박성수,진영읍,송수희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
The optical properties of PBDT-DT-FQx (80°C), PBDT-DT-FQx (from 50°C to 80°C) showed λ<sub>max</sub> at 546~567 nm in CB solution and at 576~579 nm in thin film state, E<sub>g</sub><sup>opt</sup> at 1.86 eV. Polymer (from 50°C to 80°C) showed more bathochromic shifted absorption band in both solution and film state and it means that polymer (from 50°C to 80°C) had more regioregular orientation than polymer (80°C). Polymer (80°C) and polymer (from 50°C to 80°C) showed a highest occupied molecular orbital (HOMO) energy level of -5.43 eV, -5.45 eV and lowest unoccupied molecular orbital (LUMO) energy level of -3.57 eV, -3.59 eV. Polymer (80°C) and polymer (from 50°C to 80°C), which had same back bone and alky side chain, showed similar J<sub>sc</sub> and V<sub>oc</sub>. The FF, however, increased 0.69 to 0.71 and the both polymers, polymer (80°C) and polymer (from 50°C to 80°C), had higher FF compare to the counter polymer, which polymerized at 110°C, with FF of 0.62.
A Study on Characteristics of Polymer According to the Alkyl Chain Position
이원문,박성수,진영읍,송수희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
PBDTT-DbiT-DFQx (in) and PBDTT-DbiT-DFQx (out) had completely dissolve in common solvent. Polymer (in) and polymer (out) indicated λ<sub>max</sub> at 538~547 nm in CB solution and at 555~564 nm in thin film state, E<sub>g</sub><sup>opt</sup> at 1.86~1.90 eV. Polymer (out) showed shoulder peak in solution state and the peak intensity enhanced in film state. The shoulder peak in long wavelength happened because of π-π<sup>*</sup> intermolecular transitions and it was caused by aggregation of the side chain. These polymers showed a highest occupied molecular orbital (HOMO) energy level of -5.21, -5.29 eV and lowest unoccupied molecular orbital (LUMO) energy level of -3.35, -3.39 eV, respectively. Polymer (in) showed better V<sub>oc</sub> and FF compared to polymer (out) because of good π-π stacking and effective side chain orientation. Under optimized conditions, the efficiency of Polymer (in) was achieved 4.07% of power conversion efficiencies, V<sub>oc</sub> of 0.67 V, Jsc of 9.83 mA/cm2, FF of 0.62%.
Classification and Compensation of DC Offset Error and Scale Error in Resolver Signals
이원,문종주,임원상,박준호,김장목 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
This study proposes a classification and compensation algorithm of two non-ideal output signals of a resolver to reduce position errors. Practically, a resolver generates position errors because of amplitude imbalance and quadrature imperfection between the two output signals of the resolver. In this study, a digital signal processor system based on a resolver-to-digital converter is used to reconstruct the two output signals of the resolver. The two output signals, “sin” and “cos,” can be represented by a unit circle on the xy-plot. The classification and compensation of the errors can be obtained by using the radius and area of the circle made by the resolver signals. The method computes the integration of the areas made by the two resolver output signals to classify and compensate the error. This system cannot be applied during transient response given that the area integration during the transient state causes an error in the proposed method. The proposed method does not need any additional hardware. The experimental results verify the effectiveness of the proposed algorithm.