Kazuhito Haruki

Job shop configuration with queueing networks and simulated annealing

A novel method for equipment planning is proposed for job type production systems, and computer experiment results obtained with a semiconductor fab model are given. The production system is modeled as an open queueing network (QN). The number of servers in the shops are then optimized by simulated annealing. The experiment demonstrated that the process considered is far faster than configuring the job shops manually, and that the configuration obtained is optimum, thus resolving the disadvantages of the traditional method. An advantage of the approach presented is that a wider range of parameter (e.g. product mix) optimization can be handled with the same combination of QN and annealing.<<ETX>>

Development of recyclability evaluation tool

In this paper, a new method of recyclability evaluation is proposed and an embedded tool to apply it is also presented. In this method, the recyclability of a product is given by summing up recyclabilities of all units to which the product is manually disassembled. The recyclability of a unit is calculated, if all names and amounts of materials of which the unit is composed are known. The recyclability of disassembled unit, consisted of multiple numbers, is judged by the grounds of tramp element in metals and compatibility of plastics. Recyclability of a long-lifetime product can be estimated from recyclabilities of units, which are modeled as probabilistically distributed degradation of materials.

A framework of eco-design support

Although there are several methods and tools to support environmentally-conscious design (eco-design) from various viewpoints, the images of integrated design support systems are few. In this paper, a framework of an eco-design support is proposed to make an integrated system image clear, as follows: (1) requirements of eco-design support are clarified; (2) environmental targets are derived; (3) a configuration of an eco-design support system which consists of tools is described; and (4) relations between tools and design processes are described. In addition, the recyclability evaluation tool which is newly implemented in the system is described.

Study of inverse supply chain (3). - study of promotion issues on inverse supply chain

We investigated the inverse supply chain (ISC) systems in the Japanese market for 10 selected industrial products. As a result, it was found that the existing systems maintain characteristics unique to specific product and specific industry. ISCs are constructed by combination of multiple chains such as products reuse, parts reuse, horizontal material recycling and cascade material recycling. In order to promote the development of ISCs, it is important: to clarify the way the multiple chains should be (methods of recovery, reuse, recycling and disposal of end-of-life products).