Papers by Keyword: COG

Abstract: In order to study the frequency characteristic of body oscillation in the anterior-posterior (AP) direction during upright stance, 10 subjects were exposed to the motion platform with specific posture and followed the tracks of the passive motion stimulus, sinusoidal waveform, with the increasing frequencies (0.05-1.2Hz). By measuring the displacement of the center of gravity (COG), the bode diagram between the motion of platform and body’s COG was obtained. Results showed that the mean cut-off frequency (COF) is 0.5 Hz, the mean resonance frequency (RF) is 0.316 Hz and the bandwidth of the body oscillation is 0.1-0.5 Hz in AP direction. In a conclusion, this study reaches the frequency response of human dynamic balance under passive motion stimulus by using COG values, proposes a method based on the COF values to evaluate the balance ability, and provides data support for the research of balance ability in the medical community.

Abstract: This paper presents a novel sub-pixel corner detection algorithm for camera calibration. In order to achieve high accuracy and robust performance, the pixel level candidate regions are firstly identified by Harris detector. Within these regions, the center of gravity (COG) method is used to gain sub-pixel corner detection. Instead of using the intensity value of the regions, we propose to use corner response function (CRF) as the distribution of the weights of COG. The results of camera calibration experiments show that the proposed algorithm is more accurate and robust than traditional COG sub-pixel corner detection methods.

Abstract: This paper deals with the numerical simulation of the new technology of gaseous fuel utilization on the sintering process of iron ore. The proposed methodology is to partially replace the solid fuel(coke breeze) by steelworks gases. A multiphase mathematical model based on transport equations of momentum, energy and chemical species coupled with chemical reaction rates and phase transformations is proposed to analyze the inner process parameters. A base case representing the actual industrial operation of a large sintering machine is used with thermocouples inserted into the sintering bed to record the inner bed temperatures and compare with model predictions in order to obtain model validation and parameters adjustment. Good agreement of the temperature pattern was obtained for the base case and thus, the model was used to predict four cases of fuel gas utilization: a) 2% of the wind boxes inflow from N01-N15 wind boxes of natural gas(NG), b) same condition with coke oven gas(COG), c) same condition with blast furnace gas(BFG) and d) mixture of 50% COG and 50% BFG. The model predictions indicated that for all cases, except only BFG, the sintering zone is enlarged and the solid fuel consumption is decreased about 8kg/t of sinter product. In order to maximize the steelworks gas utilization it is recommended the use of mixture of COG and BFG with optimum inner temperature distribution

Abstract: With the rapid development of iron and steel industry, high temperature coking has become an important application of coal. H2S of coke oven gas(COG) and its combustion products --SO2 has aroused more and more concern for the negative effects on environment and human health. The total coke production is about 335.53 Mt in 2007, and the caused SO2 emission is reported at about 181.19 kt. In reference to future development objectives and pollution control technologies of coking industry, the future reduction potential of SO2 emissions from coking is analyzed on the basis of coking technological progress, process improvement and industrial restructuring. It shows that the potential of SO2 emissions reduction will be 90.35 kt by 2010, and it will amount to 252.49 kt by 2015, which will be a good support to the energy-saving and emission-reduction targets of the country.