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이상연,여욱현,김준규,조성균,S.Y. Lee,U.H. Yeo,(J.G. Kim,S.K. Jo 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.3
With the increasing demand for seafood and technological advancement in aquaculture, the industry has continuously grown. On the other hand, digital twins have been actively applied to various industries. Aquaculture deals with live aquatic animals that are sensitive to growth environment management. Hence, applying a digital twin to smart aquaculture may lead to a substantial economic benefit because it enables the optimization of different variables. We analyze the status of digital twin development in agriculture. The services of the aquafarm digital twin are divided into 1) data management, 2) optimization, and 3) intelligence. Standardization related to the aquafarm digital twin is also discussed. Based on the analyses, the development stage of aquafarm digital twin is defined, and directions of technology development are suggested.
박철훈(C. H. Park),함상용(S. Y. Ham),홍두의(D. E. Hong),김준규(J. K. Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
Most of spindles for machine tool are supported by ball bearings, and there are problems in the limits of high speed and high power as well as the cumbersome maintenance due to the short life time. In order to overcome these problems of the conventional spindles, the high speed spindle with magnetic bearings is developed in this study. Magnetic bearings for 60,000 rpm class high-speed spindle are designed, and high speed spindle with magnetic bearings are fabricated. Based on the running test up to 60,000 rpm, it is verified that the spindle is stably supported by the magnetic bearings, and the magnitude of the unbalance response at 60,000 rpm is less than 3 μm.