Results 151 to 160 of about 2,075 (191)

Template-based re-optimization of rolling stock rotations

Public Transport, 2017
Rolling stock, i.e., the set of railway vehicles, is among the most expensive and limited assets of a railway company and must be used efficiently. We consider in this paper the re-optimization problem to recover from unforeseen disruptions. We propose a template concept that allows to recover cost minimal rolling stock rotations from reference ...
Ralf Borndörfer, Boris Grimm, Markus Reuther, Thomas Schlechte   +3 more
openaire   +1 more source

Re-Optimization of Rolling Stock Rotations

2014
The Rolling Stock Rotation Problem is to schedule rail vehicles in order to cover timetabled trips by a cost optimal set of vehicle rotations. The problem integrates several facets of railway optimization, such as vehicle composition, maintenance constraints, and regularity aspects. In industrial applications existing vehicle rotations often have to be
Ralf Borndörfer, Julika Mehrgardt, Markus Reuther, Thomas Schlechte, Kerstin Waas   +4 more
openaire   +1 more source

Timetable Sparsification by Rolling Stock Rotation Optimization

2018
Rolling stock optimization is a task that naturally arises by operating a railway system. It could be seen with different level of details. From a strategic perspective to have a rough plan which types of fleets to be bought to a more operational perspective to decide which coaches have to be maintained first. This paper presents a new approach to deal
Ralf Borndörfer, Matthias Breuer, Boris Grimm, Markus Reuther, Stanley Schade, Thomas Schlechte   +5 more
openaire   +1 more source

Different rotational stocking management on Brachiaria brizantha structural characteristics

2014
M.L.P. Lima, E.G. Ribeiro, F.F. Simili, L.C. Roma Junior, J.M.C. Silveira, A. Giacomini, A.E. Versesi Filho   +6 more
exaly   +2 more sources

A comparison of continuous and rotational grazing on veld at two stocking rates

Journal of the Grassland Society of Southern Africa, 1991
Two rotational grazing procedures, a four-paddock system with a 10-day period of stay and an eight-paddock system with a 5-day period of stay, were compared with continuous grazing on veld. The trial was conducted 40 km south of Bulawayo in Zimbabwe, over the six-year period 1975-81.
D.L., Barnes, R.P., Denny
openaire   +2 more sources

Cutting Stock with Rotation: Packing Square Items into Square Bins

2020
In the square packing problem, the goal is to place a multi-set of square-items of various sizes into a minimum number of square-bins of equal size. Items are assumed to have various side-lengths of at most 1, and bins have uniform side-length 1. Despite being studied previously, the existing models for the problem do not allow rotation of items.
Shahin Kamali, Pooya Nikbakht
openaire   +1 more source

The study of style rotation in chinese stock market

Proceedings of the 3rd International Conference on Business and Information Management, 2019
Many academic studies on stock markets provide evidence of style rotation and methods of style investing. However, most of the researches are based on U.S. Domestic equity mutual funds. In this paper, we present that the existence of this phenomenon in Chinese stock markets and propose a new index, named stock market characteristics index (SMCI) to ...
openaire   +1 more source

Setting safety stocks for stable rotation cycle schedules

International Journal of Production Economics, 2014
Abstract In the process industries, specialized equipment and production processes often necessitate the manufacture of products in a pre-determined sequence to minimize changeover time and to simplify scheduling complexity; these types of schedules are referred to as pure rotation schedules, or product wheels, where the circumference of the wheel is
Rappold, James A., Yoho, Keenan D.
openaire   +2 more sources

Mathematical optimization of rolling stock rotations

2017
We show how to optimize rolling stock rotations that are required for the operation of a passenger timetable. The underlying mathematical ptimization problem is called rolling stock rotation problem (RSRP) and the leitmotiv of the thesis is RotOR, i.e., a highly integrated optimization algorithm for the RSRP. RotOR is used by DB Fernverkehr AG (DBF) in
openaire   +1 more source

Stock Selection, Style Rotation

Journal of Empirical Finance, 2002
Using US data from June 1984 to July 1999, we show that the impact of firm-specific characteristics like size and book-to-price on future excess stock returns varies considerably over time. The impact can be either positive or negative at different times. This time variation is partially predictable.
Lucas, A., van Dijk, R., Prof. Kloek, T.
openaire   +1 more source