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This paper describes modeling and simulation of automotive forward collision warning and avoidance system using CASE(Computer-Aided Systems Engineering) tool. The system is composed or many sensors, a controller, warning devices, brakes and etc. The system was modeled by one activity chart, fourteen state charts and one module chart. Rear-end collision scenarios was generated by Simulink and used to support Stalemate model. The resulting model was used to evaluate the correctness of function and behavior of the system. A simulator for the system has been designed and used to validate the model under realistic operating conditions in the laboratory. To model and simulate the system's functionality and behavior brings clarity to system design early in the system development.
This paper describes a simulation of secondary motion of piston assemblies using PISDYN by Ricardo. Motions of the piston, pin, rod and skirt are separately calculated, by integrating equations of motion for individual components and dynamic degrees of freedom. The effects of engine speed at full load and pin offsets on the piston assembly secondary motions, forces and friction were investigated in parametric study for 4-cylinder gasoline engine. Results show that lateral displacement and friction loss of the piston increase as a function of engine speed. The lateral motion of the piston is affected by the change in pin offset. The minimum friction loss for the condition of 4800rpm WOT occurs at a pin offset of 1.6mm.
Aging society is rapidly progressing. According to the population projections prepared by the National Statistical office, the aging of the population of Korea would be dramatic and probably imprecedented in its speed. In the year 1960, the population aged 65 years and over showed only 3.3% of the total population. In 1990, it becomes 4.7%. According to the above projections, however, it will rise to 6.4% in the year of 2000 and to 12.5% in the year 2020. The old age dependency ratio was only definitely become the first population and social problem in Korea. The present paper describes the demographic aspects of the aging process of Korea and its implications in the fields of economic support of the aged population and of family structure, and the increase of the social security. One of the Korean solutions of aging problems is a capability of domestic care of old parents by their grown-up sons and daughters. But, today, it is not absolutely sure whether such a model can still be effective in the face of the rise of individualism, the enhancement of the status of women and the process of westernization. Finally, the paper presents some of the alternations of how to face and solve the problems of population aging. It discusses a possibility of extending retirement age, initiation of saving in earlier ages, ways of becoming self-independent in economic and social life among the aged, smoother intergenerational transfer of wealth, etc. At the same time, the paper cites some merits of the aging society, particularly low mortality which together with low fertility makes best utilization of human resources.
We study the relations between strong isoperimetric inequalities and Gromov hyperbolicity on planar graphs, and give an alternative proof for the following statement: if a planar graph of bounded face degree satisfies a strong isoperimetric inequality, then it is Gromov hyperbolic. This theorem was formerly proved in the author’s paper from 2014  using combinatorial methods, while geometric approach is used in the present paper.
현재 K-water는 부단수 관내부 탐사장비를 도입하여 누수탐사 및 관상태 조사 그리고 위치탐사를 수행하고 있다. 누수 탐사는 누수지점을 정확히 확인할 수 있는 탐사기법으로 신속한 사고를 복구 가능케 함으로써 복구비용 절감 및 피해 확산을 방지하고 있다. 또한, 도로구간 등 굴착확인이 곤란한 지점과 GIS 불탐구간 등 어려운 여건에서도 누수 여부 확인 등 정밀한 진단이 가능하게 되었다. 그리고 관상태 조사로 노후관 상태 조사를 실시함으로써 구간별 적정 개량공법 및 사업비를 선정하여 합리적 의사 결정을 지원하고 있다. 또한 위치가 불명확한 관로의 위치탐사를 실시하여 사고 발생 시 대규모 단수피해를 사전에 방지하고 안정적인 시설물 유지관리에 기여하고 있다.