objectives: the aim of this research is to compare cognitive flexibility and adjustment between two groups of students with developmental coordination disorder (dcd) and typically developing students. methods: for this purpose, 50 students with dcd and 50 typically developing students were chosen among 12 primary schools. the developmental coordination disorder questionnaire (dcd-q), adjustment...

one effective method for improving the performance of supply chain is making coordination among members of supply chain. this paper studies the subject of coordination of supply chain by using an insurance contract. the supply chain consists of one-manufacturer and one-retailer that the retailer is faced with potential demand and returning of goods from customer. acceptance of goods returned is...

With the intensive integration of photovoltaic (PV) sources into low-voltage distribution networks (LVDN), nodal voltage limit violations and fluctuation problem cause concerns on safety operation a power system. The intermittent, stochastic, fluctuating characteristics PV output leads to frequent fast voltages. To address violation problem, this paper proposes distributed regulation method bas...

A distribution system was designed and operated by considering unidirectional power flow from a utility source to end-use loads. The large penetrations of distributed generation (DG) into the existing distribution system causes a variety of technical problems, such as frequent tap changing problems of the on-load tap changer (OLTC) transformer, local voltage rise, protection coordination, excee...

controller design and optimization problems, with more than one objective, are referred as multiple objectives or multiple attributed problems. in this paper, a novel method is proposed for designing optimum pid controller that is called genetic multiple attributed decision making method (gmadm). this method is newer than the previous methods and in this paper some options are considered that h...

although many mathematics-based and heuristic approaches have been recently developed on optimally allocation of tcscs for lines overloads reduction and buses voltage stability enhancement during fault conditions, the works on the tcscs efficiency to achieve the abovementioned goals are rare. this idea that tcscs can surely enhance the system’s security must be comprehensively investigated. in ...

Metal-oxide surge arresters have dynamic characteristics that are significant for overvoltage coordination studies involving fast front surges. Several models with acceptable accuracy have been proposed to simulate this frequency-dependent behavior. Difficulties arise in the calculation and adjustment of the model parameters: in some cases iterative procedures are required, in others the necess...

In this paper in order to ensure that protection of the system remains reliable even after introduction of DG is studied key Protection Challenges of the DN with DG and established rules for the design and coordination of protective relays in a power system. Such as Differential Protection Schemes, A Balanced Combination of Different Types of DG Units for Grid Connection, Inverter Controller De...

This paper introduces an adaptive sequential droop control strategy for PV inverters to mitigate voltage rise problems in PV-rich LV distribution networks. To facilitate the effective coordination of (Q?V and P?V) inverters, multiple areas with strong coupling nature systems are identified based on ?-decomposition technique. The parameters tuned adapted, a consensus among within each area. prop...

damping of a full-scale cable with a pair of passive–on magnetorheological (mr) dampers was tested. a cable of 215.58m long with the first mode frequency of 0.658hz was tensioned horizontally in cable prefabrication factory. two mr dampers were attached to the cable in an angle in the plane perpendicularly to the cable axis in 5m length from the cable anchorage. the applied voltage level was 0v...