• Journal of Korean Society of Transportation
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• v.24 no.3 s.89
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• pp.17-27
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• 2006

Car following model is a theory that examines changes of condition and interrelationship of acceleration deceleration. headway, velocity and so on closely based on the hypothesis that the Posterior vehicle always follows the preceding vehicle. Car following mode) which is one of the research fields of microscopic traffic flow was first introduced in 1950s and was in active progress in 1960s. However, due to the limitation of data gathering the research depression was prominent for quite a while and then soon was able to tune back on track with development in global positioning system using satellite and generalization of computer use. Recently, there has been many research studies using reception materials of global Positioning system(GPS). Introducing GPS technology to traffic has made real time tracking of a vehicle position possible. Position information is sequential in terms of time and simultaneous measurement of several vehicles in continuous driving is also practicable. Above research was focused on judging whether it is feasible to overcome the following model research by adopting the GPS reception device that was restrictively proceeded due to the limitation of data gathering. For practical judgment, we measured the accuracy and confidence level of the GPS reception devices material by carrying out a practical experiment. Car following model is also being applied in simulations of traffic flow analysis, but due to the difficulty of estimating parameters the basis of the above result. it is our goal to produce an accurate calibration of car following model's parameters that is suitable in this domestic actuality.

• The Journal of the Korea Contents Association
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• v.8 no.8
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• pp.196-205
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• 2008

The purpose of this study was to examine the relationship of participation in jazz dance to body image and mental health in an attempt to make a contribution to the spread of jazz dance. The subjects in this study were 183 people who were selected by purposive sampling from a population of Seoul and Gyeonggi province residents who were at the Western age of 18 and up. The selected people took general education courses at colleges, attended cultural centers or fitness clubs, or learned dance for all. One instrument used in this study to assess their body image was Jourard and Secord(1954)'s Body Cathexis Scale, which was modified into six factors and 39 items. The other was Kim Gwang-il, et. al.(1978)'s 46-item inventory, which translated Rickles and Rock(l976)'s SCL-90 with 90 items to suit Korean circumstances. That inventory was modified into 31 items and four factors. For data handling, factor analysis, reliability analysis, regression analysis and path analysis were utilized. The findings of the study were as follows: 1. The extent of jazz dance participation had an impact on their body image. Those who performed jazz dance more frequency had a better image about their health and the lower part of the body. 2. The level of jazz dance participation exerted an influence on their mental health. A longer participation term led to more interpersonal sensitivity, and a higher participation frequency was followed by more somatization. 3. Concerning the causal relationship of participation in jazz dance to body image and mental health, the participation frequency affected health, the image of the lower part of the body and somatization in the firsthand manner, and the image of the lower part of the body had a firsthand impact on interpersonal sensitivity, hostility, anxiety and depression. Accordingly, the image of the lower part of the body played a crucial role as a parameter in the relationship between the jazz dance participation frequency and mental health.