Showing papers by "Hiroshi Morita published in 2003"
TL;DR: In this article, the authors developed a method for identifying the economies of scope by using data envelopment analysis, which involves the use of non-parametric production frontiers and does not require cost information on inputs and outputs.
36 citations
TL;DR: In this paper, an alternative approach to eliminate the non-zero DEA slacks while keeping the original DEA frontier unchanged is presented. But the approach is limited to the case of data envelopment analysis (DEA).
13 citations
01 Jan 2003
TL;DR: The newly proposed method can deal with the situation when FDEFs do not exist and may deem those extreme efficient DMUs which are not located on any FDEF as inefficient.
Abstract: Constrained facet analysis is used to evaluate decision making units (DMUs) which have non-zero slacks in data envelopment analysis (DEA) by requiring a full dimensional efficient facet (FDEF). The current paper shows that the FDEF-based approach may deem those extreme efficient DMUs which are not located on any FDEF as inefficient. Using strong complementary slackness condition (SCSC) solutions, this paper develops an alternative method for the treatment of non-zero slack values in DEA. The newly proposed method can deal with the situation when FDEFs do not exist.
1 citations
01 Jan 2003
TL;DR: In this article, the authors developed an approach for characterizing and measuring supply chain efficiency and achieving best practice. But, the efficiency of a supply chain cannot be characterized directly by the performance of supply chain members.
Abstract: An appropriate performance measurement system is the key to effective supply chain management. Two hurdles are present in measuring the performance of supply chain as a whole. One is the existence of multiple measures that characterize the performance of individual supply chain members. The other is the existence of conflicts between supply chain members with respect to specific measures. As a result, the efficiency of a supply chain cannot be characterized directly by the performance of supply chain members. The current study develops an approach for characterizing and measuring supply chain efficiency and achieving best practice. Models are provided to define the supply chain efficiency and to measure the performance of a supply chain as well as supply chain members. It is shown that a supply chain as a whole has potential to achieve more cost savings and a better performance through coordination and information sharing based upon our linear programming problems.
1 citations
01 Jan 2003
TL;DR: In this article, the authors show that the scale and congestion depend on the different technology assumption, and that the congestion is associated with the non-zero slack values, while the scale component depends on the input disposability and returns to scale (RTS) assumptions, respectively.
Abstract: DEA inefficiency can be characterized by scale and congestion components. We show that the scale and congestion depend on the different technology assumption. The scale component and congestion component depend on the input disposability and returns to scale (RTS) assumptions, respectively. It is also shown that the congestion is associated with the non-zero slack values.