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( Changbo Hou ),( Shuai Guo ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.7
Phase-generated carrier (PGC) demodulation algorithm is the main demodulation methods in Fiber-optic interferometric sensors (FOISs). The conventional PGC demodulation algorithms are influenced by the carrier phase delay between the interference signal and the carrier signal. In this paper, an automatic carrier phase delay synchronization (CPDS) algorithm based on orthogonal phase-locked technique is proposed. The proposed algorithm can calculate the carrier phase delay value. Then the carrier phase delay can be compensated by adjusting the initial phase of the fundamental carrier and the second-harmonic carrier. The simulation results demonstrate the influence of the carrier phase delay on the demodulation performance. PGC-Arctan demodulation system based on CPDS algorithm is implemented on SoC. The experimental results show that the proposed algorithm is able to obtain and eliminate the carrier phase delay. In comparison to the conventional demodulation algorithm, the signal-to-noise and distortion ratio (SINAD) of the proposed algorithm increases 55.99dB.
Changbo Jiang,Xiaojian Liu,Yu Yao,Bin Deng 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
To improve our current understanding of tsunami-like solitary waves interacting with a row of vertical slotted piles on a sloping beach, a 3D numerical wave tank based on the CFD tool OpenFOAM® was developed in this study. The Navier-Stokes equations were employed to solve the two-phase incompressible flow, combining with an improved VOF method to track the free surface and a LES model to resolve the turbulence. The numerical model was firstly validated by our laboratory measurements of wave, flow and dynamic pressure around both a row of piles and a single pile on a slope subjected to solitary waves. Subsequently, a series of numerical experiments were conducted to analyze the breaking wave force in view of varying incident wave heights, offshore water depths, spaces between adjacent piles and beach slopes. Finally, a slamming coefficient was discussed to account for the breaking wave force impacting on the piles.
Construction of Chromosome Segment Substitution Lines (CSSLs) in Cotton
Changbo Dai,Yujuan Jia,Qing-Lian Wang,Myeong-Hyeon Wang 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
Most traits of crop are quantitative, which are controlled by polygenes. Finely mapping ofquantitative trait loci (QTLs) is very important for cotton genetic improvement. Chromosome segment substitution lines (CSSLs) containing only one or a few segments of donor chromosome introgressed into a recipient genetic background can be used for QTL fine mapping and map-based cloning. In this study, the Gossypium. hirsutum variety ‘ZM36’ and Gossypium. barbadense ‘Hai1’ were respectively used as recurrent and donor parent to produce a segment substitution lines populations, including the BC4F2:3 and BC4S2:4 generations, by using microsatellite marker-assisted selection (MAS). We obtained 283 SSR marks by taking about the average 5 cM distance selection marks on this map, and these marks were carried to the molecular examination with to two populations. The results showedthat recurrent parent genetic background already to restore the very high degree through the high generation of backcross.
Inheritance Characters Analysis of Chromosome Segment Substitution Lines (CSSLs) in Cotton
Changbo Dai,Yujuan Jia,Qing-Lian Wang,Myeong-Hyeon Wang 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
Chromosome segment substitution lines (CSSLs), in which each line carries a single or a few defined chromosome segment of donor genome and has a pure genetic background from a recurrent genotype, is a fundamental approach to conduct the QTL mapping in order to improve the mapping precision. In the present study, variety ‘ZM36’ (Gossypium. hirsutum) and ‘Hai1’ (Gossypium. Barbadense) were used as recurrent and donor parent to produce a segment substitution lines populations, respectively. The results indicated that most of fiber quality traits, yield-related traits and verticillium wilt traits fit the normal distribution in the Kolmogorov-Smirnov test. In 133 lines of BC4S2:3 generation fiber length longer the recurrent parent has 37, micronaire lower than the recurrent parent has 58, Fiber strength over than the recurrent parent has 34. In 199 individuals of BC4S2:4 generation fiber length longer the recurrent parent has 37, micronaire lower than the recurrent parent has 36, Fiber strength over than the recurrent parent has 49. Fiber length had significantly positive correlation with fiber strength and negative correlation with micronaire, seed index had significantly positive correlation with boll weight and negative correlation with lint percentage, lint percentage had negative correlation with fiber length and strength.
이창보(Changbo Lee),배중면(Joongmyeon Bae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Optimization of cathode properties for intermediate temperature-operating SOFC (IT-SOFC) is carried out by using composite-type electrode structure in this study. Composite cathode may lower cathode overpotential by enhancing mixed ionic-electronic conductivity. In this study, particularly, LSM/YSZ, LSF/YSZ, LSCF/CGO, and PSC/CGO were selected as cathode materials. LSM/YSZ composite cathode showed the best performance of about 0.9Ω㎠ at 700℃. It is inferred that the resistance is mainly affected by the reactivity between cathode and electrolyte which can cause the formation of resistive phases. Area specific resistance (ASR) characteristics were not changed significantly with decreasing sintering temperature of cathode, because reaction sites were increased even with worse adhesion of cathode on electrolytes.
이창보(Changbo Lee),백승욱(Seungwook Baek),배중면(Joongmyeon Bae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Optimization of cathode properties for intermediate temperature-operating solid oxide fuel cell(IT-SOFC) is carried out by using La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>Co<SUB>1-x</SUB>Mn<SUB>x</SUB>O<SUB>3-δ</SUB>(LSCM) cathode structure in this study. However, cobaltcontained cathode materials cause undesirable reactions making resistive phases with YSZ electrolyte. By adopting Ce<SUB>0.9</SUB>Gd<SUB>0.1</SUB>O<SUB>2-δ</SUB>(CGO) interlayer between LSCM and YSZ, cathode performance is remarkably improved about three times. And also, in thermal cycling tests, CGO-layered sample is hardly degraded even after fifth measurement. In this study, La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>Co<SUB>0.4</SUB>Mn<SUB>0.6</SUB>O<SUB>3-δ</SUB> cathode on CGO-layered YSZ showed the best performance of 0.14Ω㎠ at 700℃.
Ye, Changbo,Chen, Weiyang,Zhu, Beizuo,Tang, Leiming Electronics and Telecommunications Research Instit 2021 ETRI Journal Vol.43 No.5
Herein, we estimate the direction of arrival (DOA) of non-Gaussian signals for nested arrays (NAs) by implementing the fourth-order difference co-array (FODC) and successive methods. In particular, considering the property of the fourth-order cumulant (FOC), we first construct the FODC of the NA, which can obtain O(N<sup>4</sup>) virtual elements using N physical sensors, whereas conventional FOC methods can only obtain O(N<sup>2</sup>) virtual elements. In addition, the closed-form expression of FODC is presented to verify the enhanced degrees of freedom (DOFs). Subsequently, we exploit the vectorized FOC (VFOC) matrix to match the FODC of the NA. Notably, the VFOC matrix is a single snapshot vector, and the initial DOA estimates can be obtained via the discrete Fourier transform method under the underdetermined correlation matrix condition, which utilizes the complete DOFs of the FODC. Finally, fine estimates are obtained through the spatial smoothing-Capon method with partial spectrum searching. Numerical simulation verifies the effectiveness and superiority of the proposed method.
금속지지체형 고체산화물 연료전지의 단전지 특성 및 전산해석
이창보(Changbo Lee),배중면(Joongmyeon Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Newly structured metal-supported solid oxide fuel cell was fabricated and characterized by impedance analysis and galvanodynamic experiment. Using a cermet adhesive, thin ceramic layer composed of anode(Ni/YSZ) and electrolyte(YSZ) was joined with STS430 metal support of which flow channel was fabricated. La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>Co<SUB>0.4</SUB>Mn<SUB>0.6</SUB>O₃ perovskite oxide was used as cathode material. Single cell performance was increased and saturated at operating time to 300hours at 800℃ because of cathode sintering effect. The sintering effect was reinvestigated by half cell test and exchange current density was measured as 0.005A/㎠. Maximum power density of the cell was 0.09W/㎠ at 800℃. Numerical analysis was carried out to classify main factors influencing the single cell performances. Compared to experimental Ⅳ curve, simulated curve based on experimental parameters such as exchange current density was in good agreement.
Jiang, Changbo,Liu, Xiaojian,Yao, Yu,Deng, Bin The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
To improve our current understanding of tsunami-like solitary waves interacting with a row of vertical slotted piles on a sloping beach, a 3D numerical wave tank based on the CFD tool $OpenFOAM^{(R)}$ was developed in this study. The Navier-Stokes equations were employed to solve the two-phase incompressible flow, combining with an improved VOF method to track the free surface and a LES model to resolve the turbulence. The numerical model was firstly validated by our laboratory measurements of wave, flow and dynamic pressure around both a row of piles and a single pile on a slope subjected to solitary waves. Subsequently, a series of numerical experiments were conducted to analyze the breaking wave force in view of varying incident wave heights, offshore water depths, spaces between adjacent piles and beach slopes. Finally, a slamming coefficient was discussed to account for the breaking wave force impacting on the piles.