A bi-objective mathematical model is developed to simultaneously consider the quay crane and yard truck scheduling problems at container terminals. Main real-world assumptions, such as quay cranes with non-crossing constraints, quay cranes’ safety margins and precedence constraints are considered in this model. This integrated approach leads to better efficiency and productivity at container te...

Modifying the proof of a theorem of Wilkie, it is shown that if a one dimnsional set S is definable in an O minimal expansion of the ordered field of the reals, and if it is regularly exponentially near to many integral points, then there is an unbounded set, which is R definable without parameters, and which is exponentially near to S.

In this article we will describe some of the main developments in interest-rate modelling since Black & Scholes’ (1973) and Merton’s (1973) original articles on the pricing of equity derivatives. In particular, we will focus on continuoustime, arbitrage-free models for the full term structure of interest rates. Other models which model a limited number of key interest rates or which operate in ...

The aim of this paper is to develop an integrated model for reducing dope in copper production process. Dope is referred to as any material formed as spillage, splash, etc. which is the result of pots transportation. Complex constrains such as transportation priority, cranes conflict, cycle stages, copper grade, and cranes failures must be considered. In order to consider the aforementioned con...

In the paper, the ultrasonic sensor checking device union PLC communication function was introduced, which was applied to anti-collision protect system of multiple bridge cranes stride over the same rack in the railroad service workshop. The hardware and software system were designed which could communicate directly between FX2N series PLC and FREQROL series frequency transformers. PLC uses FX2...

This work addresses the Quay Crane Scheduling Problem under availability constraints, whose main goal is to determine the work schedules of the quay cranes allocated to a container vessel in order to carry out its transhipment operations (loading and unloading operations). An Estimation of Distribution Algorithm with shaking procedure is proposed to solve it. The position of the tasks and the o...

This study investigates the problem of scheduling gantry cranes, which are the main handling equipment in railway container terminals. Since the gantry cranes share two common tracks, some interference constraints are considered for the scheduling problem. The scheduling problem is formulated as an integer programming model. In the view of the high computational complexity, a Particle Swarm Opt...

T HE Sandhill Crane (Grus canadensis) nests on the low, wet coastal tundra near the mouth of the McConnell River (60” 50’ N, 94” 25’ W) , on the western shore of Hudson Bay. During studies of geese and jaegers we have made many casual observations of cranes. Although adult cranes are conspicuous due to their large size and loud calls, the nests and young are very difficult to locate. Since the ...