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CNC 자동선반을 이용한 SCM415강의 소형 깊은 내경홀가공 특성 연구
최철웅,김진수 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.4
Small-scale production is increasing, and the manufacturing industry is gradually changing into a smartmanufacturing industry. Therefore, research on securing optimal cutting conditions for factors affecting machiningprecision during cutting is very important. Therefore, the purpose of this study is toAfter machining the inner diameter hole of SCM415 steel with a cermet tool on a CNC automatic lathe, thesurface roughness, dimensional accuracy, and dimensional straightness are measured according to the feed rate toanalyze the machining characteristics and suggest optimal cutting conditions. The test material was cut using acermet tool for secondary cutting after a round bar with a diameter of 20 mm was mounted on a CNC automaticlathe. The cutting length was fixed at 0.5 mm, and the cutting speed was fixed at 3200 rpm. When the feed ratewas changed to 0.05, 0.1, and 0.15 mm/rev, the respective surface roughness during the 15th test was measured. Consequently,The lower the feed rate, the better is the surface roughness. In addition, the optimum cutting conditions forSCM415 steel were observed to be the most ideal cutting conditions than the condition of 0.05 mm/rev at a cuttingspeed of 3,200 rpm and a feed rate of 0.1 mm/rev.
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Development of PKNU3: A small-format, multi-spectral, aerial photographic system
최철웅,이은경 대한원격탐사학회 2004 大韓遠隔探査學會誌 Vol.20 No.5
Our laboratory originally developed the compact, multi-spectral, automatic aerialphotographic system PKNU3 to allow greater flexibility in geological and environmental data collection.We are currently developing the PKNU 3 system, which consists of a color-infrared spectral cameracapable of simultaneous photography in the visible and near-infrared bands; a thermal infrared camera;two computers, each with an 80-gigabyte memory capacity for storing images; an MPEG board that cancompress and transfer data to the computers in real-time; and the capability of using a helicopterplatform. Before actual aerial photographic testing of the PKNU3, we experimented with each sensor.We analyzed the lens distortion, the sensitivity of the CCD in each band, and the thermal response of thethermal infrared sensor before the aerial photographing. As of September 2004, the PKNU3development schedule has reached the second phase of testing. As the result of two aerial photographictests, R, G, B and IR images were taken simultaneously; and images with an overlap rate of 70% usingthe automatic 1-s interval data recording time could be obtained by PKNU3. Further study is warranted toenhance the system with the addition of gyroscopic and IMU units.We evaluated the PKNU 3 system as a method of environmental remote sensing by comparing eachchlorophyll image derived from PKNU 3 photographs. This appraisement was backed up with existingstudy that resulted in a modest improvement in the linear fit between the measures of chlorophyll and theRVI, NDVI and SAVI images stem from photographs taken by Duncantech MS 3100 which has samespectral configuration with MS 4000 used in PKNU3 system.
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최철웅,문성용,윤호섭,라성주,한종석,최상덕,이우범 國立 麗水大學校 環境問題硏究所 2002 環境硏究論文集 Vol.5 No.-
This study was performed to characterize the seasonal fluctuation of water quality and sediment environment from April, 2001 to November, 2001 in Gamak bay. Which was a productive area, but recently its fisheries conditional have been deteriorated because of increasing waste-water from municipal area, industry and autochthonous pollution by farm industry. In the survey of seawater quality, DO and COD concentrations were lowest in bottom layer at summer, but DIN and DIP contents were higher than those in surface layer. Eutrophication indices mean that eutrophication area move from south to north entrance via northern-west inner area with seasonal change from summer to autumn. In the survey of sediment environment, ignition loss(IL), chemical oxygen demand(COD), DIN and Dip were in the range of 3.8~15.7%, 10.3~60.6mg/g-dry, 5.053~1.810mg/ℓ and 0.065~0.324mg/ℓ , respectively. COD in sediment were highest at winter and spring. And, they were higher than sediment standard in the south inner area, which mean heavily polluted conditions with organic constituents.
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