This paper presents an integer programming formulation for integrating maintenance planning tasks in the railway rolling stock circulation problem. This is a key problem in railway rostering planning that requires to cover a given set of services and maintenance works with a minimum amount of rolling stock units. An additional objective is to limit the number of empty rides. The constraints of ...

This paper examines the pricing of options by approximating extensions of the Black{Scholes setup in which volatility follows a separate diiusion process. It generalizes the well{known binomial model, constructing a discrete two{ dimensional lattice. We discuss convergence issues extensively and calculate prices and implied volatilities for European{ and American{style put options. A Deutscher ...

We consider an inventory distribution system consisting of one warehouse and multiple retailers. The retailers face random demand and are supplied by the warehouse. The warehouse replenishes its stock from an external supplier. The objective is to minimize the total expected replenishment, holding and backlogging cost over a finite planning horizon. The problem can be formulated as a dynamic pr...

  Length composition data (fork length) of kawakawa (Euthynnus affinis ), landed between April 2003 to March 2005 in Coastal Waters of Hormozgan province in Iran ( Persian Gulf and Sea of Oman) , were monthly used to estimate the p opulation parameters and for the assessment of the stock. The growth parameters of von Bertalanffy equation were estimated as L∞: 87.66 cm, K: 0.51 per year and t0: ...

The images for Figs 2, 3 and 5 appear incorrectly. Please view the correct Figs 2, 3 and 5 here. Fig 2. Unicredit stock log-return, r t , series (blue line, left axis) and the filtered regime of volatility s t|t (red line, right axis). access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any med...

Whether China continues its business-as-usual investment-driven, environment-polluting growth pattern or adopts an investment and innovation-driven, environmentally sustainable development holds important implications for both national and global environmental governance. Building on a Ramsey-Cass-Koopmans growth model that features endogenous technological change induced by R&D and knowledge s...

Fateme Derakhshan-Panah was born in Hamedan (Iran) in 1987. She received her B.S. in Pure Chemistry (2009) and M.S. in Organic Chemistry (2011) from Bu-Ali Sina University, Iran. She is currently working towards her Ph.D. under the supervision of Professor M. A. Zolfigol. Her research interest is organic methodology especially the application of solid acids and ionic liquids in organic synthesis.

In this paper, we develop integrated retail shelf space allocation and inventory models for a single item with a stock dependent demand. The integrated models are developed for a supply chain operating under vendor-managed inventory (VMI) and consignment stock (CS) agreement. More precisely, the supplier is responsible for initiating orders on behalf of the retailer and decides about the size o...

E. R., set. 6, the child of a dock labourer, was admitted into the Children's Hospital, under my care, with the following history: For the last six months she had been gradually losing her voice, and her breathing had become bad. She had no cough in the daytime, but at night would get attacks of dyspnoea and coughing. She never had suffered from croup, but three years ago had a sharp attack of ...