As a system complexity increases and technology innovation progresses rapidly, leasing the equipment is considered as an important issue in many engineering areas. In practice, many engineering fields lease the equipment because it is an economical way to lease the equipment rather than to own the equipment. In addition, as the maintenance actions for the equipment are costly and need a specialist, the lessor is responsible for the maintenance actions in most leased contract. Hence, the lessor should establish the optimal maintenance strategy to minimize the maintenance cost. This paper proposes two periodic preventive maintenance policies for the leased equipment. The preventive maintenance action of policy 1 is performed with a periodic interval, in which their intervals are the same until the end of lease period. The other policy is to determine the periodic preventive maintenance interval minimizing total maintenance cost during the lease period. In addition, this paper presents two decision-making models to determine the preventive maintenance strategy for leased equipment based on the lessor’s preference between the maintenance cost and the reliability at the end of lease period. The structural properties of the proposed decision-making model are investigated and algorithms to search the optimal maintenance policy that are satisfied by the lessor are provided. A numerical example is provided to illustrate the proposed model. The results show that a maintenance policy minimizing the maintenance cost is selected as a reasonable decision as the lease term becomes shorter. Moreover, the frequent preventive maintenance actions are performed when the minimal repair cost is higher than the preventive maintenance cost, resulting in higher maintenance cost.

The purpose of this study is to investigate changes in the rental Hanbok market and consumer during the past 10 years. This study was done by analyzing internet news about rental Hanbok and in-depth interview. The results provide basic data that can be used to understand the rental Hanbok market. Results showed the followings: First, the rental Hanbok market has expanded and consists of two types of rental Hanbok; ceremonial and experiential. The experiential Hanbok is new but a big part in rental Hanbok market. It is not existed until 2007 but it accounted for more than 60% of internet news about rental Hanbok in 2016. Second, there is a significant difference in consumer behavior between the two types of rental Hanbok. Ceremonial Hanbok showed consistent consumer behavior between 2006 and 2016. Consumer want to get benefits such as TPO(occasion suitability), economy, exhibition, trendy and exceptionality through renting Hanbok. On the other hand, experiential Hanbok, consumers are motivated by having unique, conformity and sharing memories. Based on these results, different sets of information reveal the unique features of the two types of rental Hanbok. And also needed to develop new designs and marketing strategies for them.

The government has been operating the long-term care insurance since 2008. In June 2010, the government manual wheelchairs, electric beds, manual beds, mattresses prevent pressure ulcers, mobile tub, bath lifts, including six items were changed to rental-only item. For the successful settlement of welfare equipment rental system, The efforts to prevent inconvenience of welfare equipment user's and improvement of the system for the activation is needed. The main object of this study is to identify the factors affecting satisfaction of welfare equipment rental and seek to proposals of revitalizing equipment rental system.