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김원일,이윤경,우성문,최상봉 경남대학교 신소재연구소 1997 論文集 Vol.8 No.-
본 논문은 전자기식 센서의 용접선 검출 특성에 관한 연구이다. 센서의 검출 성능에 영향을 미치는 설계 인자를 실험을 통하여 결정하고 센서를 제작하였다. 제작된 와전류식 전자기 센서를 용접선에 가로지르는 방향으로 주사하여 센서의 용접선 검출능력을 확인하였다. 그리고, 냉간 압연강판 및 스테인레스 스틸, 알루미늄, 구리와 같은 다양한 재료에 대해 용접선 검출 능력을 확인한 결과 냉간 압연강판에서의 검출 능력은 가장 양호하게 나타났고 고합금강 및 비철금속에 대해서도 용접선 검출 가능성을 확인하였다. 또한, 높이 방향 제어용 센서로써의 가능성도 확인하였다. This study is a work on weld line detecting characteristriic of electromagnetic sensor arc welding. Design parameters which effect on sensor performance were determined by experiments. Then a proper electromagenetic sensor of eddy current type was made by using the determined design parameters. Detecting ability of weld line on butt joint in sheet metal was confirmed by scanning the sensor across the weld line. Experiments were also performed on a variety of materials as cold rolled steel, stainless steel, aluminum, and copper and the detecting abilities were compared with each other. Experimental results have shown that the detecting ability on butt joint of sheet metal is good and the sensor can also be used for height control.
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金元鎰,金敬年 경남대학교 신소재연구소 1994 論文集 Vol.4 No.-
본 연구는 선반작업에 있어서 工具形象과 作業條件의 變化에 대하여 표면거칠기의 形成因子를 규명하기 위한 것이다. SNMG120404, SNMG1408과 DNMG150404, DNMG150408의 공구형상이 사용되었고, 절삭속도와 이송과 같은 작업조건이 변화되었다. 즉 절삭속도는 150, 200, 250m/min, 이송은 0.05, 0.1, 0.3mm/rev로 변화시켰다. 周波數分析 結果에 의하면, 표면거칠기는 移送에 가장 큰 영향을 받았으며 바이트의 떨림은 표면거칠기 뿐만 아니라 파상도에도 영향을 미치고 있었다. 아울러 主軸의 떨림은 표면거칠기에 약간의 영향을 미쳤으며 工具形象은 표면거칠기에 영향을 미치지 않았다. This study is to evaluate components of surface roughness in turning with respect to the tool configuration and the changes of working condition. Tool configurations of SNMGEB4.04, SNMGI20408 and DNMG 150404, DNMG150408 are used, and working conditions such as cutting speed and feed are adopted. The changes of cutting speed and feed are 150, 200, 250m/min and 0.05, 0.1, 0.3 mm/rev, respectively. From the results obtained by frequency analysis with spectrum, it is noted that the surface roughness was influenced most significantly by the feed, and the vibration of bite had an effect on both the surface roughness and the surface waviness. It is also observed that the vibration of the spindle had little influence on the suraface roughness and the tool configuration was not the components of the surface roughness
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김원일,왕덕현,이윤경,이재만,신경오 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-
다방향 적층구조 중합체 목합재료의 드릴가공시 발생하는 적층분리 현상에 대해서 절삭속도 및 이송속도의 변화시키면서 실험적 연구를 진행하였다. 드릴가공시 발생되는 재료거동의 탄성파의 변형을 시편의 측면에서 음향방출신호로 측정하였으며, 광학현미경과 전자현미경으로 적층분리된 측정값과 표면거칠기 측정에서 얻은 결과를 얻어 비교하였다. 음향방출 신호로 측정한 결과와 공구현미경의 실제측정값 및 표면거칠기에서 적층분리가 발생한 지점이 거의 일치함을 확인하였다. 본 실험결과 드릴공구로 사용된 소결합금 공구는 이송속도가 낮고 절삭속도를 큰 경우 적층분리 현상을 억제하여 양호한 가공면을 얻을 수 있었다. An experimental study on the delamination phenomena during drilling of laminate polymer composites, was conducted according t o the change of cutting speed and feed rate. The analysis of acoustic emission signals was in good agreement with measured values by optical microscopy. And also the surface roughness characteristics of workpiece in drilling was accumulated and compared. It was found that the delamination location measured by AE signals and real measurement values by tool microscope are almost same. The better surface and prevention of delamination was obtained by the slight increase of cutting speed and the decrease of feed rate when sintered tool was used.
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김원일,이재명,강종표 한국산업안전학회 1997 한국안전학회지 Vol.12 No.4
From the experimental study of wire-cut Electric Discharge Machining for alloyed steel and tungsten carbide, the characteristics such as hand drum form has been observed and evaluated for various conditions. Hand drum form can be improved when gap voltage and spark cycle become smaller, their thickness become thinner, wire tension become larger and number of cutting is done so many times. When wire-cut 60㎜ thickness tungsten carbide in normal condition, Hand drum form becomes larger due to the low conductivity inducing cobalt composite rising by electrolysis.
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Simultaneous detection of major pathogens causing bovine diarrhea by multiplex real-time PCR panel
김원일,조용일,강석진,허태영,정영훈,김남수 한국임상수의학회 2012 한국임상수의학회지 Vol.29 No.5
Bovine diarrhea is a major economical burden to the bovine industry in Korea. Since multiple infectious agents can be involved in bovine diarrhea, differential diagnosis is essential for effective treatment. Therefore, a panel of two multiplex real-time PCR assays which can simultaneously detect six major bovine enteric pathogens [i.e., bovine viral diarrhea virus (BVDV), bovine coronavirus (BCoV), group A bovine rotavirus (BRV), Salmonella spp., Escherichia coli (E. coli) K99^+, and Cryptosporidium parvum] was developed and applied to test 97 fecal samples collected from cattle farms in Korea. In addition, microscopic examination was also preformed on the samples to detect Coccidium oocyst. The estimated sensitivity of the multiplex PCR was 0.1 TCID_(50) for BVDV, BCoV and group A BRV, 5 and 0.5 CFU for E. coli K99^+ and Salmonella, respectively, and 50 oocysts for Cryptosporidium. The amplification efficiency of the multiplex PCR ranged between 0.97 and 0.99 for each pathogen. Among 97 samples, 36 samples were positive for at least one of the 6 major pathogens and 6 samples were simultaneously positive for 2 pathogens by the multiplex PCR assay. Coccidium oocysts were also detected in 48 samples, which were all collected from over 1 month old calves. In conclusion, the multiplex real-time PCR panel can be a useful tool for fast and accurate diagnosis of calf diarrhea associated with BVDV, BCoV, group A BRV, E. coli K99^+, Salmonella, and/or Cryptosporidium and Coccidium may be an important target which needs to be included in the multiplex PCR panel in the future.
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토양중 카드뮴과 납의 Phytoextraction 을 위한 식물재배 연구
김원일,정구복,문광현 한국환경농학회 2000 한국환경농학회지 Vol.19 No.3
중금속 오염토양에 대한 식물복원법(phytoremediation)중 phytoextraction을 적합한 식물종의 탐색을 위하여 비식용식물인 섬유류 3종, 화훼류 3종 및 수목류 5종을 대상으로 Cd과 Pb을 각각 15, 100 ㎎ ㎏^(-1) 으로 조절하여 처리한 토양에서 pot 재배한 후 식물중에 흡수된 함량 및 그 흡수량을 조사하였다. 식물의 건물생산량은 양황철, 물푸레나무, 사철나무 등 수목류가 섬유류 및 화훼류보다 높게 나타났다. 식물의 부위별 Cd 및 Pb함량은 줄기와 잎보다 뿌리에서 높았고, 식물별 Cd 함량은 채송화, 메리골드, 목화, 아마 순으로 높았으며 Pb 함량은 대마 및 아마에서 높게 나타났다. 식물의 Cd 및 Pb 총 흡수량은 양황철, 사철나무, 물푸레나무, 영산홍 순으로 높게 나타났다. 식물의 Cd 및 Pb 총 흡수량은 시험후 토양에 잔류한 Cd, Pb 함량과 고도의 부의 상관을 보였다. 식물의 건물생산량 및 흡수량을 볼 때 양황철, 사철나무, 물푸레나무 및 영산홍 등이 토양정화식물로의 가치가 있다고 생각된다. In order to select more proper plants for phytoextraction at the heavy metal polluted areas, 11 species of non-edible plants were cultivated at the cadmium(Cd) and Lead(Pb) treated soils and analyzed the content of the absorbed Cd and Pb in each part of plants. Plants include three fibers(Linum usitatissimum, Cannabis sativa, Gossypium spp.), three flowers(Calendula officinalis, Rhododendron lateritium, Portulaca grandiflora), and five trees(Pinus thunbergii, Magnolia kobus, Populus nigra x P. maximowiczii, Euonymus japonica, Fraxinus rhynchophylla). Yield of tree species were higher than that of fiber and flower species. Cd and Pb were highly accumulated in root rather than leaves and stems. The Cd content of plants was in the order Portulaca grandiflora > Calendula officinalis > Gossypium spp. > Linum usitatissimum, Pb was Cannabis sativa > Linum usitatissimum > Fraxinus rhynchophylla. Total absorbed Cd by each plant was in the order Populus nigra x P. maximowiczii > Euonymus japonica > Rhododendron lateritium, but Pb was Populus nigra x P. maximowiczii > Rhododendron lateritium > Euonymus japonica. Total absorbed Cd and Pb contents in plants were negatively correlated with the residual Cd and Pb in the treated soils. It was estimated that Populus nigra x P. maximowiczii, Euonymus japonica, Fraxinus rhynchophylla, and Rhododendron lateritium were the most effective species for phytoextraction in the polluted area considering yield and heavy metal uptake.
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