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고속열차의 지하정거장 통과 시 발생하는 공기역학적 영향에 대한 전산유체해석 연구
임광만(K.M. Lim),김영매(Y.M. Kim),방명석(M.S. Bang),권혁빈(H.B. Kwon) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.4
Dong-tan Station, shared by high-speed railway and urban express railway, is a very complicated underground station having 6 tracks together with barrier and shafts between them, therefore it seems very hard to investigate the aerodynamic effects including the pressure variation and train gust in the station when a high-speed train runs through it. In this study, the aerodynamic effects on the structures and platform passengers when a high-speed train runs through an underground station have been studied using Computational Fluid Dynamics. STAR-CCM+ has been employed for numerical simulation based on Navier-Stokes equation and 2-equation turbulence model and moving mesh scheme supported by STAR-CCM+ has also been used to represent the relative motion between a train and station. Based on the simulation results, the unsteady flow fields in the underground station induced by the high-speed train have been analyzed and the pressures on the PSDs and pressure variation at the platform have quantitatively assessed.
PSC-beam 교량에서 철도소음 예측 및 저감방안 연구
임광만(Kwang-Man Lim),엄기영(Ki-young Um),조국환(Kook-Hwan Cho) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The down town passage segment which follows in the straight line which follows recently in high speed of the railway and rail construction is increasing. Also according to quality of life improvement of the citizens whom follows in national income increase the resident demand only becomes larger day by day about a environmental creation which is comfortable and house environmental etc. Demand of the citizens is not the problem of today yesterday about like this railway mean of transportation and with the fact that continuously will increase in future. This study is to predict and reduce railway noise from the conventional PSC-beam bridges which passes through urban areas under the government strateges of speed and weight increases of railway. The purpose of this study is to recommend a proper noise prediction method for designing pleasant roadside environments. The railway design including existing line reconstructions should minimize curved alignment to increase train speed to 180~200km/hr under the government's long-term planing such as the 4th Comprehensive National Development Plan (2000~2020) National Intermodal Transportation Plan (2000~2019) and National Railroad Network Establishment Plan (2006~2015) Since the PSC-beam bridges are mainly used for bridge structures urban areas noise measurements were performed and analyzed to recommend the noise prediction methods for each type and speed of train respectively.
합성(合成) 추출(抽出) 수지(樹脂)를 이용(利用)한 백금용액(白金溶液)으로부터 알루미늄과 철(鐵)의 분리(分離)
임광일,한동혁,황인성,한춘,이진영,김준수,박형규,Lim, Gwang-Il,Han, Dong-Hyuk,Hwang, In-Sung,Han, Choon,Lee, Jin-Young,Kim, Joon-Soo,Park, Hyung-Kyu 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.3
수지합성 시 추출제의 고른 분산과 균일한 입자를 만들어 알루미늄과 철의 추출량을 증가시키고자 반응 개시제인 benzoyl peroxide(BPO)의 첨가법을 변화시킨 결과 세 번 나누어 첨가한 3pot의 성능이 가장 우수하였다. D2EHPA를 이용하여 합성한 수지의 경우 Fe와 Pt간에 Fe는 100% 추출되었으며, Al과 pt간의 분리실험에서 99.9%의 Al이 추출되었다. 수입되는 $P_{204}$ 수지 역시 Fe와 Pt간의 분리실험에서 100%의 Fe가 추출되었으며 Al과 Pt간의 분리실험에서는 98.9%의 Al이 추출되는 것을 확인하였다. 합성수지와 $P_{204}$내 추출제 함량은 각각 61.8, 60%이며, 이러한 차이가 추출효율에 차이를 가져오는 것으로 판단된다. 한편 두 수지 모두 $55^{\circ}C$까지는 Al과 Fe의 추출효율이 증가하나, 그 이상의 온도에서는 영향이 없는 것으로 확인되었다. FT-IR분석 결과 추출제에 따른 고유의 피크를 $1000cm^{-1}$에서 확인할 수 있었으며 합성한 추출 수지와 $P_{204}$ 수지 모두 $2900cm^{-1}$에서 가교 폴리스틸렌의 특징적인 피크를 확인하였다. For the separation of aluminum and iron from platinum mixtures, extraction resins were synthesized and separation efficiencies were compared with those by commercial one, $P_{204}$. During synthesis, the suspension polymerization method was adopted with D2EHPA as an extractant. Also, benzoyl peroxide as a starter was divided into 3parts and injected for the uniform size and dispersion of resin particles. Comparison tests resulted in 100% separation of Fe and Pt for both synthetic and $P_{204}$ resins. In case of Al and Pt, synthetic and $P_{204}$ resin gave extraction efficiencies of 99.9% and 98.9%, respectively. Difference in extractant contents of synthetic resin(61.8%) and $P_{204}$(60%) was considered to give differences in separation efficiencies of aluminum and iron elements. For both resins, separation efficiencies of Al and Fe increased up to $55^{\circ}C$. According to FT-IR analyses of both resins, specific peaks of D2EHPA and crosslinked polystyrene were identified at the wavenumber of $1000cm^{-1}$ and $2900cm^{-1}$ respectively.
폐신문지(廢新聞紙)(ONP)로부터 부유선별(浮遊選別)을 이용한 잉크분리(分離)시 초음파처리(超音波處理) 효과(效果)
임광일,황인성,김정운,유광석,안지환,한춘,Lim, Gwang Il,Hwang, In Sung,Kim, Joung Woon,You, Kwang Suk,Ahn, Ji Whan,Han, Choon 한국자원리싸이클링학회 2012 資源 리싸이클링 Vol.21 No.5
재생률이 높은 폐신문지(old newspaper, ONP)를 부유선별법을 이용하여 탈묵을 진행하였을 시, 해리시간, 초음파처리에 따른 백색도, 잔류잉크농도(effective residual ink concentration, ERIC), 수율의 효과를 규명하였다. 또한 부유선별시 pH, 포수제에 따른 백색도, ERIC과 수율의 효과도 규명하였다. 해리시간이 증가할수록 백색도와 ERIC이 증가함을 보였으나 수율의 차이는 없었다. 해리시간이 30분일 때 백색도 58% ERIC 182.9 ppm이였고, 해리를 더 진행하더라도 백색도의 증가를 볼 수 없었다. 단 해리 된 ONP를 초음파발생장치를 이용하여 초음파처리를 했을 경우 단 2분의 해리시간으로도 58%이상의 백색도를 얻을 수 있었다. 초음파처리를 20분간하고, pH 11에서 포수제로 등유을 사용했을 때 백색도가 59.32%로 가장 높았다. In this study, the sonication method was applied to remove ink from old newspaper(ONP) using flotation. Results indicated increased whiteness and effective residual ink concentration (ERIC) with longer disintegration. Therefore 58% of whiteness and 182.9 ppm ERIC were obtained for 30 minutes of disintegration time without the change in yield. Longer disintegration than 30 minutes had no effects on whiteness without the application of ultra-sonication. On the other hand, higher than 58% of whiteness was achieved in 2 minutes of disintegration when the ultra-sonication was applied. The highest whiteness (59.32 %) was obtained by applying sonication for 20 minutes and froth flotation with kerosene as a collector under the alkaline condition (pH 11).
Design and Implementation of Digital Signal Processor and Development System
임광일,이우선,신인철,이태원,Lim, Kwang Il,Lee, Woo Sun,Shin, In Chul,Rhee, Tae Won The Institute of Electronics and Information Engin 1986 전자공학회논문지 Vol.23 No.6
A real-time microprogrammable digital signal processor is designed and implemented using the bit-slice logic, a parallel multiplier, 74 series TTLs and MOS memories. A microinstruction set for the processor is defined and an application program development system is constructed. For its performance evalution, a digital filter and FFT are implemented with this digital signal processor. It is proved that this processor is faster than commrcially available single chip digital signal processors such as \ulcornerD 7720, AMI 2811, enabling very high speed digital signal processing.
열차의 위치 정보 취득을 위한 네트워크 RTK 적용 가능성 연구
이은수(Lee, Eun Soo),임광만(Lim, Kwang Man),방명석(Bang, Myung-Seok) 한국지적정보학회 2014 한국지적정보학회지 Vol.16 No.2
본 연구는 토탈스테이션, RTK, 네트워크 RTK 측량 방법으로 철로위 부착 타겟 및 철로 간이 차량의 위치를 취득하였고 이에 대한 정확도 분석을 수행하였다. 철로위 부착 타겟 위치 취득 실험의 경우, 좌표를 이용한 절대 비교와 길이를 이용한 상대비교에서 토탈스테이션, Stop & Go RTK 및 네트워크 RTK 결과는 각각 최대 ±0.020m, ±0.010m 이내의 차이를 보였다. 철로 간이 차량 위치 취득 실험의 경우, 토탈스테이션 결과 도면과 연속 네트워크 RTK 결과 도면을 중첩하여 도해 분석을 수행한 결과, 최대 약 3cm 이내의 차이를 보였다. 네트워크 RTK 신호 지연율을 0.02초로 가정할 경우 시속 300km의 열차는 약 1.7m의 정확도로 열차의 위치 정보를 취득할 수 있다고 판단한다. This study acquired position data from the targets on the railway and temporary railway vehicles using total station, RTK and network RTK measurement methods and analyzed their accuracy. According to a test on the acquisition of the position data from the targets on the railway, total station, Stop & Go RTK and network RTK results didn’t exceed ±0.020m and ±0.010m each in coordinates-based absolute comparison and length-based relative comparison. In a test on the acquisition of position data from temporary railway vehicles, the drawings of total station and continuous network RTK were overlapped, and schematic analysis was conducted. Then, difference reached up to less then 3cm. When assumed that the network RTK signal latency is 0.02 sec., it is considered that a train travelling at 300km/h would be able to get train position data with 1.7m accuracy.
통계적 방법과 인지실험을 통한 한국어 초성파열음의 음소단위 분석에 관한 연구
조철우,이우선,이규호,김종안,임광일,이태원,Jo Cheol-Woo,Lee Woo-Sun,Lee Cyu-Ho,Kim Jong-Ahn,Lim Gwang-Il,Lee Tae-Won 한국음향학회 1989 韓國音響學會誌 Vol.8 No.5
본 논문에서는 한국어의 규칙합성에 관한 연구중 파열음의 함성 파라미터를 추정하기 위하여 사용한 통계적 방법과 인지실험에 의한 방법에 관하여 기술하고 있다. 합성기로는 직렬 포만트 합성기를 구성하여 사용하였고 통제적 분석에 사용된 음성시료는 9개의 초성 파열음과 8개의 모음으로 구성되는 72개의 독립 CV형태를 갖는 단음절을 만일 화자를 통하여 수집하였다. 음성의 분석은 시간 및 주파수 평면에서 파라미터의 변화를 중심으로 행하였으며, 인지실험을 통한 파라미터 추정방법을 통하여 독립적으로 포만트 파라미터의 변화에 관하여 조사하였다. This paper describes a statistical methods and perception test for extracting the parameters to be used for the synthesis-by-rule of Korean plosives. Formant synthesizer is chosen for the synthesis of the phonemes. Speech materials for the analysis consists of 72 CV monosyllables from the single male speaker. The analysis is done mainly focused on the variation of parameters in time and frequency domain, then perception tests are executed to estimate the effects of variations of the formant transitions.