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노병준,최유진,Kopp, Charles M, 대한기계학회 1985 大韓機械學會誌 Vol.25 No.3
최근에는 온라인 시스템(on-line system)에 의하여 난류의 신호를 직접 신호분석기에서 받아 분석하여 컴퓨터에 의해 데이터를 처리하고, 풀롯터(plotter)에 의해 도시함으로서 유동의 특성을 통계학적인 방법으로 해석해 나가고 있다. 본 해설에서는 온라인시스템에 의한 난류의 통계 학적 측정방법과 기본적인 이론 및 측정도시에 예를 제시하고자 한다.
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Cross Jet의 亂流流動에 對한 實驗的 考察 : 2nd Report: for the structure of two cross jet flows
盧秉俊 全北大學校 1983 論文集 Vol.25 No.-
This experimental study was effectuated as second investigation on the cross jet using a circular section nozzle. The measurement and the analysis of the cross jet flows in the axial direction give following results. (1) Visualization shows that the 45°cross jet flows exactly to the axial direction and it represented an axisymmetric velocity distribution profile. The structure of the complete mixed flow region was appeared like a singe jet flow. (2) The increase of the vertical width of the mixed flow was larger than the horizontal one. The momentum flow rate and the inertia force developed by the jet flows oriented to 22.5° caused a little increase of the horizontal width of the jet section. The minimum width of the mixed flow section existed at X/X_0=1.30. (3) The intensity of turbulence was axisymmetrically distributed and its profile was shown as a singe jet. (4) The velocity of the mixed flow along the centerline increases linearly before X/d??12, but it abruptly decreases in the region of 12<X/d<20 and it slowly decrease after X/d=20. The maximum velocity was formed at X/X_0=1.07∼1.12 independent upon the variation of the velocity. (5) The momentum variation showed a little decrease according to the increase of the axial distance because of the gradient of the back pressure from cross jet flow and the decay of the mean velocity caused by the increase of turbulence.
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盧秉俊 전북대학교 공업기술연구소 1975 工學硏究 Vol.4 No.-
The condition, in pneumatic conveyance of granular solids, that is impossible to convey has been experimented with emphasis on the blockade of pipe line in case of low pneumatic conveyance velocity. The blockade has various factors, of them the pneumatic conveyance velocity and supply quantity of granular solids are regarded as the most important ones. And then, on the base of that, this has been experimented and examined. According to the results, the positions of the blockade point have been changed depending upon the variation of Fr. No. and the ratio of mixture. So it is believed that, as the specific weight is in the range of 1.23 g/㎤-1.44 g/㎤ and the supply quantity of testing materials has 40 g/sec.-80 g/sec. ranges. the limit of Fr. No. (limit velocity) is as follow.
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盧秉俊,鄭材鍊,姜永準 전북대학교 공업기술연구소 1983 工學硏究 Vol.13 No.-
In this report, a free axisymmetric turbulent jet issuing from V-shaped slit(with an angle 30˚) in the axial direction has been studied. The structure of the flow behind the full mixed flow region show a single free jet velocity distribution profiles. Comparing the mean velocity distribution profiles with those calculated by the empirical equation of H. Schilichtin and Abramovich. They coincide well in the region of Ū/Ū_max ≧ 0.2, but they almost become a constant value at the region of Ū/Ū_max < 0.2. the velocity variation was examined along center line, after X/a=21, this mean velocity distribution decreases linearly. The distribution of fluctuating velocity and the intensity of turbulence also symmetrically distributed along the center line, and according to the Z the values are apparently varied in the central part but not in the outer sides. Finally behind the full mixed flow region, the distribution profiles represent a very classical single jet form.
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액막형 동축노즐의 2상 난류분사의 미립화 특성에 관한 실험적 연구
노병준,강신재,오제하 대한기계학회 1995 대한기계학회논문집 Vol.19 No.6
In this study, a liquid sheet type co-axial nozzle has been used to investigate the turbulent atomization characteristics which could result in the experimental data to be used in designing a jet nozzle with high performance. Image processing technique and immersion sampling method were employed to measure droplet size. In atomizing characteristics, droplet size distributions and absolute droplet sizes, SMD(Sauter Mean Diameter) have been investigated in the wide ranges of flow field depending upon the air-water mass ratios. And the comparisons between the present data and the semi-empirical curves have been conducted semi-empirical correlation for SMD has been derived in the present analysis.
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노병준,강신재,한윤봉,오제하 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
본 연구에서 개발된 액적크기 측정용 자동 영상처리 시스템은 분무노즐로부터 얻어지는 액적의 크기를 저가의 구성장비로 상세하게 측정된 자료로서 제공할 수 있었다. 본 시스템의 정확도는 액적의 평균직경에 대하여 3%이내의 오차를 가지고 있어 만족할 만한 신뢰도로서 결과를 얻을 수 있었다. 그리고 한장의 영상처리에 소비되는 전체시간은 약 25초 이었다. 그러나 이 처리시간은 고속전산기의 발달로 보다 단축될 것으로 기대된다.
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노병준,강신재,오제하 全北大學校 1992 論文集 Vol.34 No.-
The purpose of this study is to investigate the atomizing characteristics by taking advantage of a liquid film type coaxial nozzle. Air and water are utilized as working fluids and the mass ratio air/water has been controlled to characterize the atomization, diffusion and development of mixing process. By way of a photographic technique, conventional developing structures and diffusion angles have been analyzed systematically with variations of mass ratios. The turbulent flow components of the atomized particles were measured by a two channel LDV system and the data were treated by an on-line measurement equipment. The non-dimensional distributions of the mean flow components followed a remarkable similarity and the trubulent random data showed higher order levels and dispersions depending upon the mass ratios. Throughout the photographic investigation, the spreading angles decreased because the axial inertia moment was relatively higher than the lateral one with respect to the increase of mass ratio. But the mixing flow was found to diffuse linearly in a certain limit region. And the atomizing characteristics, that is, the distributions of particle diameters did not show particular differences. It may be expected that these fundamental results can be used as reference data in studying the atomizations, breakup and diffusions.
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노병준 대한교통학회 2021 대한교통학회 학술대회지 Vol.85 No.-
본 연구는 1) 운수회사 위험운전 분석과 2) 도심 내 교통사고 예측을 목표로 한다. 먼저, 운수회사 위험운전 분석에는 데이터 큐브 모델링을 활용한 다차원 분석을 활용하며, 운수회사에 등록단 차량의 위험행동 정보, 법규위반정보, 업체규모 등의 정보를 활용하여 데이터 큐브를 구성하고, 분석을 수행한다. 도심 내 교통사고 예측부 에서는 상업용차량 및 프로브차량의 DTG 정보 및 도로기하구조정보를 활용하여 교통사고 예측, 심각도 추정, 원인 분석의 일련의 과정을 수핸한다. 먼저, DTG로부터 획득한 위험운전 정보 및 교통사고 이력정보를 활용하여, 격자단위의 예측 모델을 구성한다. 도심 교통사고의 예측을 위해 합성곱 신경망(Convolutional Neural Network, CNN) 모델을 활용하였으며, 일차적으로 교통사고의 유무를 예측한 후 이를 기반으로 계층적 깊은 신경망 (Hierarchical Deep Neural Network, DNN)을 활용하여 교통사고의 위험심각도를 예측하였다. 마지막으로, 교통사고 요인 파악을 위하여 해당 cell의 도로기하구조등의 정보를 활용한 의사결정트리를 바탕으로 정성적인 원인 분석을 수행하였다.
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