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RISS 인기검색어
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- 저자 : 박흥식(Park Heung Sik) (검색결과 203 건)
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실험계획법을 이용한 엔드밀 가공시 주축 진동에 대한 정량적 분석 및 수학적 모형
박흥식,이상재,배효준,진동규,김영희,Park, Heung-Sik,Lee, Sang-Jae,Bae, Hyo-Jun,Jin, Dong-Kyu,Kim, Young-Hee 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
End-milling have been widely used in aircraft, automobile part and moulding industry. However, various working factors such as spindle speed, feed rate and depth of cut in end-milling have an effect on spindle vibration. There it is demanded the quantitative analysis of spindle vibration in order to get the optimum surface roughness. This study was carried out to analyze an influence of working factors on spindle vibration by design of Experiment. The results are shown that mathematical model of regression equation for an influence of working factors on vibration acceleration of spindle in end-milling by regression analysis is presented.
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박흥식,김영희,전태옥,조연상,문병주,Park, Heung-Sik,Kim, Yeong-Hui,Jeon, Tae-Ok,Jo, Yeon-Sang,Mun, Byeong-Ju 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
The fractal-based method for describing rubbed surface texture has aroused great interest. The determination of rubbed surface topography is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe topography of the rubbed surface, the wear test was carried out with annular surfaces of wear testing specimens in dry friction. furthermore, the relation between the fractal dimensions and the frictional conditions are also investigated and fractal descriptors was applied to rubbed surface with image processing. Fractal dimension can be determined by sum of intensity difference of image surface pixel. Fractal dimension increased according as the applied load and sliding distance increase. Topography of the rubbed surface can be effectively obtained by fractal dimensions.
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박흥식,우규성,조연상,전성재,Park, Heung-Sik,Woo, Kyu-Sung,Cho, Yon-Sang,Jun, Sung-Jae 한국트라이볼로지학회 2007 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.23 No.1
It necessarily follows that wear particles are generated through a friction and wear in a mechanical moving system. The wear particles are relative to the failure and the life of machine elements directly. To analyze the wear particle, its shape characteristics were calculated quantitative values such as diameter, roundness and fractal parameters by digital image processing. In this study, the histograms of shape parameters of wear particles were used for the purpose of analyzing the distribution of wear particles in various conditions. We consider that the histogram of shape parameter can be effectively represented to study a wear mechanism.
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박흥식,최진우,이형곤,PARK Heung-Sik,CHOI Jin-Woo,LEE Hyung-Gon 한국수산과학회 2000 한국수산과학회지 Vol.33 No.1
Benthic environments and composition of macrobenthic fauna around the marine fish culture cages were studied to clarify the effect of fish farming near Tongyong from August, 1995 to february, 1996. Sediment grain size and bottom dissolved oxygen under the fish cages were similar to that of a control site, but organic content was higher under the cages. Fewer species were found under the fish cages than under the control site, but conspicuously higher density was obtained under cages. Capitella capitals, Nebalia bipes were dominant infauna, and Asterina pertinifera and Astelias amurensis were dominant epifauna under the fish cage whereas Lumbrineris longifolia and Anphioplus sp. dominated in the control site. Diversity index showed seasonal variation under the fish cages, but showed little variation at the control site. The benthic fauna under the fish cages showed different community structures from the control site. As results, the fish culture cages affected the benthic environment and the community structure of benthic fauna by input of the organic content and biological effects such as dead shells.
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천수만 조하대 연성저질에 서식하는 저서동물 우점종의 분포 양상과 저서 환경
박흥식,강래선,이재학,Park Heung-Sik,Kang Rae-Seon,Lee Jae-Hac 한국수산과학회 2006 한국수산과학회지 Vol.39 No.2(특별호)
Dominant species of macrobenthos were analyzed based on differentiation of three distinct methods: the density based method, the biomass based method and LeBris method, by considering the frequency of occurrence using quantitative data collected over 5 years (1993-1998) at 21 stations in Chonsu Bay. Sedimentary environments as well as species composition and diversity showed the spatial and temporal distribution patterns. The ranks of dominant species as determined by the density based method were more similar to the results by the LeBris method than to those from the biomass based method. Considering the temporal variation, LeBris method were more efficient than any other methods for the determination of dominant species in Chonsu Bay. Lumbrineris longifolia, Theora fragilis, and Moerella jedoensis were recognized by all three methods. A one-way analysis of variance indicated spatial distributions patterns among most of the dominant species. These species showed positive correlations to sedimentary parameters such as mean grain size. However, T. fragilis and Paraprinospio pinnata showed the temporal patterns in their distribution, and were also correlated to the benthic environment, organic content and dissolved oxygen. Some dominant species, e.g., T. fragilis, S. scutata, G. gurjanovae proved to be useful benthic indicators based on the environmental variations determinated by long-term benthic ecological monitoring in Chonsu Bay.
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천수만 조하대 연성저질의 저서환경과 저서동물 군집의 시${\cdot}$공간적 양상
박흥식,임현식,홍재상,PARK Heung-Sik,LIM Hyun-Sig,HONG Jae-Sang 한국수산과학회 2000 한국수산과학회지 Vol.33 No.3
본 조사는 천수만의 저서환경과 저서동물의 시${\cdot}$공간적인 분포를 알아보기 위해 실시하였다. 계절별 표${\cdot}$저층간의 수온차이는 나타나지 않았으며, 여름철 방조제 부근에서 발생한 방류의 영향으로 표층 염분도가 감소하는 양상을 보였다. 저층용존산소의 경우 방조제 부근에서 감소하였으며, 빈산소 수괴가 형성되었다. 입도 조성의 경우 만입구보다는 방조제 부근에서 더욱 세립한 것으로 나타났으며, 유기물 함량의 경우도 만 입구에서 감소하였다. 조사 기간 중 총 311종, 769$ ind./m^2$의 저서동물이 채집되었다. 다모류가 종 수와 서식밀도에서 높은 비중을 차지하였다. 종 수는 방조제 부근에서 만 입구로 갈수록 증가하는 공간적인 양상을 보였으며, 서식밀도는 여름철 가입에 따른 계절적인 양상을 나타냈다. 이 시기에 Lumbrineris longifolia, Theora fragilis등 기회종이 대규모로 가입되었다. 집괴분석에 의해 공간적으로 5개 군집으로 나누어졌다. 방조제 부근은 주로 기회종으로 구성되었으며, 만 중앙부는 Stemaspis scutata, Paraprionospio pinnata, 만 입구는 Mediomastus califomiensis, Nephtys polybranchia 등이 우점종으로 나타났다. 결과적으로 천수만은 계절별 환경변화 공간적 차이가 종조성에 영향을 주고 있는 것으로 보이며, 시공간적으로 저서 생태계의 안정성에 영향을 미치는 것으로 보인다.
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