제안 방법

• Based upon the method of a life cycle cost comparison, this paper compares the cost of low-pressure sodium lamp with that of fluorescent lamp. For this study, we represent a sample tunnel through computer simulation and thereby estimate the number of light bulbs needed for a certain degree of roadway illumination.
• For this research we used the method of comparing the cost of low-pressure sodium lamp and that of fluorescent lamp in terms of cost efficiency. The number of needed light bulbs is determined through simulation for each lighting system to embody the same road illumination inside the tunnel.
• Also will there be specular reflection and diffused reflection according to the materials. For this study, we apply 25% reflection rate for the concrete surface inside the tunnel and 60% for white tiles on the side-wall.
• Based upon the method of a life cycle cost comparison, this paper compares the cost of low-pressure sodium lamp with that of fluorescent lamp. For this study, we represent a sample tunnel through computer simulation and thereby estimate the number of light bulbs needed for a certain degree of roadway illumination. Then we project the cost for initial installment and its maintenance cost needed for tunnel lighting and thus suggest a method of calculating the life cycle cost of the alternative lighting systems.
• The degree of drivers’ adaptation to brightness when they approach to a tunnel is determined by the brightness required for the entrance lighting. The design of entrance lighting is based on the concept of outside brightness, the designed speed in the tunnel, the length of tunnel, and the kind of road surface. We posit the outside brightness as 5000 cd/m2.
• The simulation of lighting can be used to analyze and appraise the distribution plan of illumination and brightness before the lighting system is actually installed. It can also become a foundational information for decision making process on any new investments for lighting system.
• This study suggests the method of using simulation test to estimate the cost, Life Cycle Cost, for keeping each lighting lamp during a certain period. LCC consists of the initial installation cost and maintenance cost in a certain period.
• We need to analyze and compare the estimation of the whole LCC for each alternative lighting. With the aid of sensitivity analysis of each cost element, we could arrive at the more concrete, objective analysis about the cost efficiency.