objective: to determine the epidemiology and pattern of emergency operating room workload in nemazee hospital affiliated with shiraz university of medical sciences, shiraz, iran. methods: all surgical emergency operations which were performed in nemazee hospital, shiraz, iran were collected over twelve months (september 2007 to september 2008). the data obtained included indications, presenting...

Many operations managers have realized the potential of guanxi to facilitate business transactions. Likewise, operations management researchers have looked at the negative impact caused by the bullwhip effect on excess inventory and the impact of the bullwhip effect on business performance. To date, however, no empirical research has integrated these research streams. Therefore, we draw on both...

In this study we explore the implications of using recycled versus virgin materials for the supply chain structure and supplier relationships as well as the broader effects on operations strategy. We focus our study on the corrugated cardboard industry, where vertical integration is common, and non-integrated firms are both customers and competitors of integrated firms. These multiple supplier/...

In portfolio optimization problems, the minimum expected investment risk is not always smaller than the expected minimal investment risk. That is, using a well-known approach from operations research, it is possible to derive a strategy that minimizes the expected investment risk, but this strategy does not always result in the best rate of return on assets. Prior to making investment decisions...

Empirical evidences show that Japan-based companies moved their major operations to the USA due to the currency appreciation of Japanese Yen in 1980s. However, the multinational firms moving their operations abroad still face both the risk of foreign price and the risk of foreign exchange rate. According to the purchasing power parity (PPP) and interest rate parity (IRP), the foreign exchange r...

Consider a mass customizer who produces multiple variants of a product in make-to-order fashion, and who also produces some standard variants as make-to-stock. We evaluate pricing and production issues from a joint marketing and operations perspective. Marketing determines prices while operations chooses between three production strategies as it sets capacity. A key result is that under the log...

Hybrid energy systems (HES) have been proposed to be an important element to enable increasing penetration of clean energy. This paper proposes a methodology for operations optimization to maximize their economic value based on predicted renewable generation and market information. A multienvironment computational platform for performing such operations optimization is also developed. To compen...