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영상처리에 의한 블랭크 가공품의 치수측정을 위한 형상요소 추출법에 관한 연구
조연상,전성재,구현호,박흥식 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
In the design process of a press product, the reverse engineering is a necessary process. Therefore, the method of measurement must be constructed for a blank shape. In order to measure a blank shape, the vision system with non-distortion ren was constructed, and the image processing, the shape recognition and the element extraction module was made with the Visual C++ language. For the shape recognition, the distance-angle function with a shape characteristics ware used and, for the shape of element extraction, the slop function with a element characteristics was used. In this study, the shape of the rectangular gage block and circular product with a simple shape was recognized and elements in the polygon were extracted by using this system.
조연상 한국지방재정학회 2010 한국지방재정논집 Vol.15 No.2
Personnel expenditures account for a large, inflexible amount of the budgets of local government. Various attempts have been made to decrease personnel expenditures (wages and salaries) in the local governments. However, no attempts have been made to discover the most rational or efficient size of budget, nor to find the determining factors of personnel expenditures. This article is focused on finding the determining factors of personnel expenditures in lower tier governments in Korea. To find the determining factors of personnel expenditures, I tested the regression analysis model which is composed of per capita personnel expenditures and per capita area, and then investigated outliers from the regression line. In the course of testing outliers, I found that 'the congestion costs' and 'the remote place costs' had influenced the size of personnel expenditures in lower tier governments. Using the adjusted regression analysis model in which 'the congestion dummy variables' and 'the remote place dummy variables' were included, I could prove that this model was a good fit.
조연상,배명호 한국트라이볼로지학회 2019 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.35 No.1
The differential planetary gear reducer as a main component of the concrete mixer driving mechanism requires a strong torque to mix concrete compounds. As this component is currently dependent on imports, it is necessary to develop it by conducting a study on vibration analysis and the resonance problem. The noise and vibration of a concrete mixer reducer increase owing to the transmission error of planetary gears, and the damage of components occurs owing to the problems in design and production. In this study, the tooth-passing frequency is calculated to evaluate the noise and vibration of a mixer reducer, and a fast Fourier transform (FFT) analysis is conducted through a vibration test using an acceleration sensor. The vibration of the reducer is measured at three points of input and output of the shaft and planetary gear housing with fixed and variable revolutions per minute. The operating conditions of gears and bearings are evaluated by performing the FFT analysis, and the resonance problem is verified. The results show that No. 1 pinion and ring gears revolve disproportionately. The amplitude values appear high, and the wear of tooth faces occur in tooth-passing frequencies and harmonic components of No. 1 and No. 2 pinion-ring gears. Therefore, we conclude that design changes in the reducer and a correction of tooth profiles are required.
조연상,김영희,박흥식 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
The fractal dimension aims to quantitatively define the irregular characteristics of the shape in nature. It can be useful in describing morphological characteristics of various wear particles. This paper was undertaken to diagnose failure condition for sliding members in lubrication using fractal dimension. The experiments were undertaken to analyze the shape of wear particles and to diagnose failure condition for sliding members in lubrication using the image processing and the fractal parameters. It was possible to diagnose wear mechanism, friction, and damage state of machines through analysis of shape characteristics for wear particle in driven condition using fractal parameters.