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Article
Publication date: 1 June 2004

Hiroaki Sandoh, Nobuko Igaki and Toshio Nakagawa

The present study deals with an optimal inspection policy for a scale where the inspection for a scale is conducted when the elapsed time since the previous inspection or…

Abstract

The present study deals with an optimal inspection policy for a scale where the inspection for a scale is conducted when the elapsed time since the previous inspection or adjustment reaches T (> 0) for the purpose of detecting its uncalibrated or inaccurate state and where its uncalibrated state can also be detected empirically or accidentally. The design variable under such a policy is T (> 0). The expected cost per unit of time is formulated as an objective function to be minimized. The conditions under which an optimal inspection scheduled time T exists are then clarified. Numerical examples are presented to illustrate the theoretical underpinnings of the proposed formulation. The proposed model is also compared with the conventional one to show that the proposed model can reduce the cost.

Details

Journal of Quality in Maintenance Engineering, vol. 10 no. 2
Type: Research Article
ISSN: 1355-2511

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Article
Publication date: 1 December 1998

Hiroaki Sandoh, Hiroyuki Hirakoshi and Toshio Nakagawa

This study proposes a new modified discrete preventive maintenance policy where failures of a system can be detected only by inspections and be fixed by minimal repairs…

Abstract

This study proposes a new modified discrete preventive maintenance policy where failures of a system can be detected only by inspections and be fixed by minimal repairs. The maximum number of minimal repairs allowed to the system is, however, a prespecified integer, N. Under the proposed policy, inspections are conducted at times T, 2T, ...(T>0) to detect and fix failures by minimal repairs, and the whole system is preventively replaced by a new one when the cumulative number of failures detected becomes equal to an integer, k or more. The expected cost per unit time is formulated under the proposed maintenance policy. The existence of an optimal integer k=k* which minimizes the expected cost is then shown. Numerical examples are also presented to illustrate the theoretical underpinnings of the proposed formulation.

Details

Journal of Quality in Maintenance Engineering, vol. 4 no. 4
Type: Research Article
ISSN: 1355-2511

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Article
Publication date: 1 September 2005

Hiroaki Sandoh and Takeshi Koide

To make a theoretical comparison between two scale‐inspection and warranty policies for weight‐quality, one practical and the other theoretically grounded.

Abstract

Purpose

To make a theoretical comparison between two scale‐inspection and warranty policies for weight‐quality, one practical and the other theoretically grounded.

Design/methodology/approach

Comparison is made in a Stackelberg game framework considering the consumer's as well as the manufacturer's viewpoint.

Findings

The practical policy is more profitable for the manufacturer than the theoretical policy in many cases.

Research limitations/implications

The study confines itself to scale‐inspection and warranty policies, but the underlying approach used in this paper can also be applied to other topics.

Practical implications

The proposed model can also provide a lower bound for the warranty.

Originality/value

The study compares a practical policy with a theoretical one from both the consumer's and manufacturer's point of view.

Details

International Journal of Quality & Reliability Management, vol. 22 no. 7
Type: Research Article
ISSN: 0265-671X

Keywords

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Article
Publication date: 1 April 2000

Akemi Murahara and Hiroaki Sandoh

At a store of chain retailers in Japan, a manager must select some new products from the list offered by the head office and, at the same time, he must determine which…

Abstract

At a store of chain retailers in Japan, a manager must select some new products from the list offered by the head office and, at the same time, he must determine which products should be replaced by the new products he selects. For the purpose of supporting such a decision, the authors have already proposed a new brand monitoring strategy for a certain category at a retail store and provided its mathematical model. Reviews their model emphasizing its practical aspects, and applies their model to actual data on grocery products collected from a convenience store with a discussion on the characteristics of their model.

Details

Marketing Intelligence & Planning, vol. 18 no. 2
Type: Research Article
ISSN: 0263-4503

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Article
Publication date: 1 December 2004

Toshio Nakagawa, Kazumi Yasui and Hiroaki Sandoh

There exist some reliability models whose performances increase by partitioning them into parts. Such a typical model is the basic inspection policy in which an operating…

Abstract

There exist some reliability models whose performances increase by partitioning them into parts. Such a typical model is the basic inspection policy in which an operating unit is checked at suitable times for a finite time span and its failure is detected. This paper applies the concept of the basic inspection policy to five models: back‐up for hard disk, checkpoint for double modular redundancy, job partition, garbage collection, and network partition. The performances of each model are analytically evaluated.

Details

Journal of Quality in Maintenance Engineering, vol. 10 no. 4
Type: Research Article
ISSN: 1355-2511

Keywords

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Article
Publication date: 1 September 2001

Hiroaki Sandoh and Nobuko Igaki

The present study proposes two types of periodical inspection policies for a scale which weighs products in the final stage of manufacturing some specific products, such…

Abstract

The present study proposes two types of periodical inspection policies for a scale which weighs products in the final stage of manufacturing some specific products, such as chemical products. The scale is inspected at time iT(i=1,2, … ). Under ModelI, an inspection operation involves detection of a scale malfunction or inaccuracy as well as an adjustment activity. Under ModelII, an inspection is conducted only to detect a scale malfunction. If a scale malfunction is detected, an adjustment activity follows. For each model, the fraction defective and the long‐run average cost are formulated. We then examine the existence of an inspection interval Tα which makes the fraction defective under a prespecified value α (0< α <1). An economical inspection interval T* minimizing the long‐run average cost is also discussed.

Details

Journal of Quality in Maintenance Engineering, vol. 7 no. 3
Type: Research Article
ISSN: 1355-2511

Keywords

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