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타워크레인 시스템의 변위저감을 위한 인공신경망 입력성형기
박영균(Yeong-Gyun Park),성윤경(Yoon-Gyung Sung) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
These paper presents an Input Shaping Command with Artificial Neural Network based on nonlinear system of variable parameter of Tower Crane system. The system of the paper has first-order dynamic response, and the Neural Network has been trained using the PSO algorithm as a data set by the UMZVF Shaper’s solution, which is robust in first-order response. Using Neural Network Input Shaper, UMZVF Shaper and AOF-UMZV Shaper are used to simulate the residual deflection with Mini-Tower Crane.
분자선증착법으로 성장된 AlGaN 에피층의 표면 형상 분석
김제원,최인훈,박영균,김용태,Kim, Je-Won,Choe, In-Hun,Park, Yeong-Gyun,Kim, Yong-Tae 한국재료학회 1999 한국재료학회지 Vol.9 No.9
분자선증착법으로 (0001) 사파이어 기판 위에 $Al_xGa_1-_xN$ 에피층을 AlN 몰비를 변화시키면서 성장시켰다. AlN 몰비는 0.16에서 0.76까지 변화시켰으며 X선의 회절 실험과 Rutherford backscattering spectroscopy 방법을 이용하여 AlN 몰비를 결정하였다. $Al_xGa_1-_xN$ 에피층의 깊이 방향의 조성 변화를 관찰하였으며 스퍼터 시간에 대해 각 원소가 일정한 원자 농도를 가짐을 알 수 있었다. AlN 몰비의 증가에 따른 표면 특성의 변화를 관찰하기 위하여 atomic force microscopy 측정을 수행하였다. 표면에서의 입자 모양이 AlN 몰비가 변화함에 따라 원형에서 침상형태로 변화함을 알 수 있었다. 표면 입자에 대한 root mean square 값과 average roughness 값을 구하였으며 AlN 몰비를 바꿈에 따라 나타나는 변화를 관찰하였다. Structural properties of $Al_xGa_1-_xN$ epilayers grown on (0001) sapphire substrate by plasma induced molecular beam epitaxy are investigated in the range of AlN molar fraction from 0.16 to 0.76. The AlN molar fraction estimated by X-ray diffraction agrees well with that of Rutherford backscattering spectroscopy, showing a good linear relationship. The uniform Auger electron microscopy depth profile and linear dependence of average atomic concentration of all the constituents of AlGaN epilayers on AlN molar fraction imply that the epitaxial growth of $Al_xGa_1-_xN$ layers with variation of AlN molar fraction is well controlled without the compositional fluctuation in depth of the epilayer. It is observed by atomic force microscopy that the surface grain shape of $Al_xGa_1-_xN$ epilayer changes from roundish to coalesced one with increasing AlN molar fraction.
강수기 양자강 하구 주변 표층해역의 해양환경과 식물플랑크톤 군집 분포 특성
윤양호(Yang Ho Yoon),박종식(Jong Sick Park),노일현(Il Hyeon Noh),박영균(Yeong Gyun Park),김동영(Dong Yeung Kim),서호영(Ho Young Soh),황두진(Doo Jin Hwang),정순범(Sun Beom Jeong),김용주(Yong Ju Kim),신형호(Hyeong Ho Shin) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.14 No.2
We investigated the characteristics of the marine environment and phytoplankton community of surface in the adjoining sea of Yangtze river of the East China Sea in June 2005. According to the analysis of a T-S diagram, three characteristic of water masses were identified. We classified them into the mixed water mass by the Chinese continental coastal waters and Taiwan/Tsushima warm current, Chinese continental coastal waters and Taiwan/Tsushima warm current. The first water mass was characterized by high water temperature, low salinity, low density and very high Chl-a concentration. The second one was characterized by high water temperature, low salinity, low density and high Chl-a concentration and the last one was characterized by low water temperature, high salinity, high density and low Chl-a concentration. The phytoplankton community identified a total of 95 species belonging to 43 genera. The dominant species was 3 species, that is, mainly centric diatom, Skeletonema costatum in the Chinese continental coastal waters. The others one, one dinoflagellates, Prororcentrum donghaiense and one silicoflagellates, Dictyocha speculum var. otonaria in warm current regions. Standing crops of phytoplankton and Chl-a concentration were very high with ranged from 5.9 x 103 cells/L to 1.1 x 106 cells/L, and 2.90 ㎍/L to 26.40 ㎍/L, respectively. Phytoplankton productivity in the East China Sea was controlled by the discharge of Yangtze river waters which include a high concentrations of nutrients.
고집적 소자에 적용되는 저저항 텅스텐 박막에서 응력의 RF power 의존성
이창우,고민경,오환원,우상록,윤성로,김용태,박영균,고석중,Lee, Chang-U,Go, Min-Gyeong,O, Hwan-Won,U, Sang-Rok,Yun, Seong-Ro,Kim, Yong-Tae,Park, Yeong-Gyun,Gho, Seok-Jung 한국재료학회 1998 한국재료학회지 Vol.8 No.11
Si 기판의 온도를 200에서 $500^{\circ}C$까지 변화시켜가면서 고집저 소자의 금속배선으로 응용되고 있는 저저항의 텅스텐 박막을 플라즈마 화학증착 방법에 의해 제작하였다. 이렇게 증착된 텅스텐 박막의 비저항은 $H_2/WF_6 $ 가스의 분압비에 따라 매우 민감하게 작용하는 것을 알 수있다. 플라즈마 밀도가 $0.7W/\textrm{cm}^2$ 이하에서는 박막내에 존재하는 잔류응력이 $2.4\times10^9dyne/\textrm{cm}^2$ 이하이다. 그러나 1.8에서 $2.7W/\textrm{cm}^2$로 증가함에 따라 잔류응력은 $8.1\times10^9$에서 $1.24\times10^{10}dyne/\textrm{cm}^2$로 갑자기 증가하는데 이는 박막을 증착할 때에 플라즈마 밀도가 증가하면 이온이나 radical bombardment 의 영향 때문이다. Controlling the wafer temperatures from 200 to$500^{\circ}C$, low resistive tungsten thin films used for VLSI metallization are deposited by PECVD method. Resistivities of plasma deposited tungsten thin films are very sensitive to the $H_2/WF_6 $ partial pressure ratios. Residual stress behaviors of the films as a function of plasma power density were also studied. At the power density under the $0.7W/\textrm{cm}^2$, residual stress of W film is about $2.4\times10^9dyne/\textrm{cm}^2$. When the power density is. however, increased from 1.8 to $2.7W/\textrm{cm}^2$, residual stress is suddenly increased from $8.1\times10^9$ to $1.24\times10^{10}dyne/\textrm{cm}^2$ ue to the ion or radical bombardment at high power density.
2005년 봄 한국서남해역 수도수도의 식물플랑크톤 군집분포 특성
윤양호(Yang Ho Yoon),박종식(Jong Sick Park),서호영(Ho Yong Soh),정순범(Sun Beom Jeong),김용주(Yong Ju Kim),노일현(Il Hyeon Noh),박영균(Yeong Gyun Park) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2
We carried out a study on the distribution of phytoplankton community, such as species composition, dominant species, standing crops and chlorophyll a in the Sudo Strait where located the southern parts of West Sea of Korea(Yellow Sea) in spring 2005. The phytoplankton community in the surface waters was a total of 64 species belonging to 38 genera. Standing crops of phytoplankton fluctuated between 14.0 x 103 cells/L and 48.5 x 103 cells/L. Dominant species were one species of centric diatom, Paralia sulcata with dominance 77.7%. Chlorophyll a concentration fluctuated between 1.95 ㎍/L and 5.17 ㎍/L in neap tide (3.58 ± 0.87㎍/L, Mean ±SD), 1.61 ㎍/L and 4.22 ㎍/L in spring tide (3.18 ± 0.60 ㎍/L). The distribution of phytoplankton community and biomass in the Sudo Strait of southern part of West Sea of Korea was controlled by the high concentration of seston weight and tidal currents.