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...

scheduling is an important subject of production and operations management area. in flow-shop scheduling, the objective is to obtain a sequence of jobs which when processed in a fixed order of machines, will optimize some well defined criteria. the concept of transportation time is very important in scheduling. transportation can be done by robots. in situations that robots are used to transpor...

The quay crane scheduling problem (QCSP) is a global and all ports around the world seek to solve it, get an acceptable time of unloading containers from vessels or loading therefore reducing docking in terminal. This paper proposes three solutions for QCSP port Tripoli-Lebanon, two exact methods which are mixed integer linear programming dynamic algorithm, obtain optimal solution one heuristic...

Pressure-diameter curves of the esophagus were obtained to define its mechanical properties. The mucosal contribution to the strength of the esophagus was negligible until the outer diameter almost doubled, suggesting that small intraluminal pressures are held by the muscle layer alone. For larger deformations mucosal contribution increased and at failure the mucosa held over one-half of the fa...

background and objectives: operating room (or) scheduling is key to optimal operating room productivity. the significant uncertainty associated with surgery duration renders scheduling of surgical operation a challenging task. this paper proposes a novel computational stochastic model to optimize scheduling of surgeries with uncertain durations. the model considers various surgical operation co...

The globalization of production and service enterprises increased the complexity of supply chain systems and processes. The complexity of supply problems leaded to the development of new shipment strategies. The optimal design of supply chain is an important success factor of the economical operation of enterprises. Within the frame of this paper the author compare the costs of the direct shipm...

AGV (Automated Guided Vehicles) as one of the most intelligent technologies is widely applied in warehousing operations with a high speed development logistic fields. Automated material systems have proved that they would improve effectiveness loading, unloading and handling company well reducing labor cost strengthening working safety. AGV, part automated systems, preforms powerful actions ful...

The feasible solutions of the traveling salesman problem with pickup and delivery (TSPPD) are commonly represented by vertex lists. However, when the TSPPD is required to follow a policy that loading and unloading operations must be performed in a last-in-first-out (LIFO) manner, we show that its feasible solutions can be represented by trees. Consequently, we develop a novel variable neighborh...

We investigated the histopathological and immunohistochemical effects of loading on cartilage repair in rat full-thickness articular cartilage defects. A total of 40 male 9-week-old Wistar rats were studied. Full-thickness articular cartilage defects were created over the capsule at the loading portion in the medial condyle of the femur. Twenty rats were randomly allocated into each of the 2 gr...