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이영서 ( Young Seo Lee ),강신우 ( Shin Woo Kang ),이희곤 ( Hee Gon Lee ),안태식 ( Tae-sik Ahn ) 한국항행학회 2021 韓國航行學會論文誌 Vol.25 No.4
무인항공기에 적용되는 비행제어컴퓨터는 safety-critical 구성품으로, 내결함성을 확보함으로써 운용의 신뢰성을 높이기 위해 다중화 구조로 설계되고 있다. 이러한 다중화 구조가 적용된 비행제어컴퓨터는 각각의 독립적인 연산/제어 장치가 동일한 시점에 동일한 작업을 수행할 수 있도록 설계되어야 하며, 이를 위해 각 연산/제어 장치 간의 작업 동기화를 위한 동기화 알고리즘이 포함되어야 한다. 본 논문에서는 무인기에 적용되는 이중화 비행제어컴퓨터간의 동기화를 위한 소프트웨어 설계 방법을 제안한다. 제안하는 동기화 방법은 고장률 감소를 위해 최소의 하드웨어 리소스만을 사용하여 동기화할 수 있도록 설계하였고, 동기화에 사용되는 하드웨어 타이머의 동작 방식을 고려하여 설계함으로써 타이머 동작에 따른 동기화 오차를 최소화 할 수 있도록 설계하였다. A flight control computer(FLCC) applied to an unmanned aerial vehicle(UAV) is a safety-critical item, and which is designed in a multiple structure to increase the reliability of operation by securing fault tolerance. These FLCC of multiple structure should be designed so that each independent processing/control components can perform the same operation at the same time. And for this reason, a synchronization algorithm for synchronizing the operation between FLCCs should be included in an operational flight program. In this paper, we propose a software design method for synchronization between dual FLCCs applied to UAVs. The proposed synchronization method is designed to synchronize using only the minimum hardware resources to reduce a failure rate. In addition, the proposed synchronization method is designed to minimized synchronization errors due to a timer operation by designing in consideration of operation characteristics of the hardware timer used for the synchronization.
이영한(Young Han Lee),김용국(Yong Guk Kim),김홍국(Hong Kook Kim),이미숙(Mi Suk Lee),김도영(Do Young Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In this paper, we propose a super wideband extension algorithm for ITU-T G.729.1, which extends the bandwidth from 7.2 ㎑ to l4 ㎑ with a bit-rate increase of 4 kbit/s for the improved decoded quality of music signals. The proposed extension algorithm is based on th spectral band replication (SBR) technique employed in the 3GPP HE-AAC+ codec. In order to fulfill the ITU-T requirements for the super wideband extension of G.729.1, we modify the SBR technique so the proposed algorithm can work with a lower delay. It is shown from the listening tests on speech and music signals that a super wideband extension version of ITU-T G.729.l employing the proposed bandwidth extension algorithm provides better quality than G.722.lC operated at a bit-rate of 24 kbit/s, which is one of ITU-T requirements for the G.729.l super wideband extension.
이영이,Jung Bong Kim,Ho Sun Lee,Young-A Jeon,Sok Young Lee,Chung Kon Kim 한국작물학회 2012 Korean journal of crop science Vol.57 No.1
The objective of this study was to rapidly evaluate fatty acids in a collection of millet (Panicum miliaceum subsp. miliaceum) of different origins so that this information could be disseminated to breeders to advance germplasm use and breeding. To develop the calibration equations for rapid and nondestructive evaluation of fatty acid content, near-infrared reflectance spectroscopy (NIRs) spectra (1104-2494 nm) of samples ground into flour (n=100) were obtained using a dispersive spectrometer. A modified partial least-squares model was developed to predict each component. For foxtail millet germplasm, our models returned coefficients of determination (R2) of 0.89, 0.89, 0.89, and 0.92 for palmitic acid, oleic acid, linoleic acid, and total fatty acids, respectively. The prediction of the external validation set (n=10) showed significant correlation between references values and NIRs values (r2=0.64, 0.90, 0.79, and 0.89 for palmitic acid, oleic acid, linoleic acid, and total fatty acids, respectively). Standard deviation/standard errors of cross-validation (SD/SECV) values were close to 3 (2.62, 2.40, 1.85, and 2.23 for palmitic acid, oleic acid, linoleic acid, and total fatty acids, respectively). These results indicate that these NIRs equations are functional for the mass screening and rapid quantification of the oleic and total fatty acids characterizing millet germplasm. Among the samples, IT153514 showed an especially high content of fatty acids (48.14 mg g-1), whereas IT123909 had a very low content (34.44 mg g-1).