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한국 폐자원에너지 산업의 R&D 효율성과 영향요인 분석
김주호,심종호,박중구 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.4
The growth of the Waste-to-Energy (WTE) industry is attracting attention as a powerful means of reducing greenhouse gasemissions; the Korean government is supporting various efforts such as increasing R&D investment. Despite the importanceof the WTE industry, the analysis of R&D efficiency remains insufficient. This study analyzes the R&D efficiency of theKorean WTE industry and its determinants. After R&D activities are separated into input and output, R&D efficiency isanalyzed with regard to whether R&D input contributes to increased R&D output using multiple regression and logisticregression methodologies based on the survey of Korean WTE firms. In the results of analysis, the introduction of new productsand services was positively affected by R&D manpower and education-training. In addition, the redesign of products andprocesses was positively affected by R&D expenditure, R&D manpower, education-training, and the reward system. The policyimplication is that education and training for R&D manpower should be provided to improve R&D efficiency, and there shouldbe investment in basic and applied research and development research should be expanded to gain global competitiveness.
수동 선배열 소나의 저주파 간섭 신호에 대한 독립성분분석 알고리즘 비교
김주호,이종현,정명준,Kim, Juho,Ashraf, Hina,Lee, Chong-Hyun,Cheong, Myoung Jun 한국음향학회 2019 韓國音響學會誌 Vol.38 No.2
In this paper, we proposed an application method of ICA (Independent Component Analysis) to passive line array sonar to separate interferences from target signals in low frequency band and compared performance of three conventional ICA algorithms. Since the low frequency signals are received through larger bearing angles than other frequency bands, neighboring beam signals can be used to perform ICA as measurement signals of the ICA. We use three ICA algorithms such as Fast ICA, NNMF (Non-negative Matrix Factorization) and JADE (Joint Approximation Diagonalization of Eigen-matrices). Through experiments on real data obtained from passive line array sonar, it is verified that the interference can be separable from target signals by the suggested method and the JADE algorithm shows the best separation performance among the three algorithms. 본 논문에서는 수동 선배열 소나의 저주파 영역에서 수신된 표적 신호로부터 간섭신호를 분리해 내기 위해 독립성분분석 알고리즘을 적용하는 방안을 제안하고 기존 알고리즘들의 성능을 비교해 보았다. 저주파 대역 신호의 경우 비교적 넓은 방위로부터 수신되기 때문에 인접 빔 신호를 관측신호로 활용하여 독립성분분석을 수행할 수 있다. 신호분리에 사용한 독립성분분석 알고리즘은 FastICA(Fast Independent Component Analysis), NNMF (Non-negative Matrix Factorization), JADE (Joint Approximation Diagonalization of Eigen-matrices)이다. 실측 선배열 수동소나신호를 이용하여 독립성분분석을 수행한 결과 제안한 방법으로 간섭신호분리가 가능함을 확인하였으며, JADE 알고리즘의 신호 분리 성능이 가장 우수한 것으로 나타났다.