The evolution of the car has triggered research and development to meet the needs of consumer throughout the world. Structural design of the car has changed with time. This paper examines the structural design of the cars from 1900 to the 2000 to understand the structural design evolution. The data source is the Cars and Automobiles magazine, which published from 1900 - 2000. It defines the car structure as a mechanical system, the functional system of the car and the components of the car. The main structure of the car, which was used for designing a car in the history, its evolution with time and the parts of the car were discussed. The data were analysed with qualitative and quantitative methods. The most important result of the research was that the evolution of the structural design of the car from 1900 to 2000 includes design and conceptual thinking, significant-scale and quantity changes of the components, and the use of highly innovative materials. The high-quality materials at that time made the deceleration of the structure relatively slow.
There are some studies on the physiological characteristics of the knee joint, but few studies that compare the flexion characteristics of the normal knee and the opposite limb in children and adults, the reasons for these differences, whether they are structural, and whether they are permanent. We conducted tibial tuberosity translation tests to examine the knee motion characteristics of children and adolescents and compare these with those of adults. The subjects were the same age children and adolescents and we conducted the tests with and without brace and side differences. The results were as follows. When compared with those in adults, the children and adolescents had slightly greater translation displacement of the tibial tuberosity. With the brace, as in adults, the translation displacement of the tibial tuberosity of the children and adolescents increased significantly with phase angle. In contrast, there was no significant difference among phase angle and translation of the tibial tuberosity of the adults. With the brace, the human motion characteristics of the children and adolescents were similar to those of adults and were very similar to those of adults with the brace. The differences between the adult and the children and adolescents patters of knee fibular ligament motion suggests little influence on the knee joint structure at the early stage and it is subject to the impact of the bracing conditions to become an adult. d2c66b5586