The Ultra-Wideband (UWB) indoor positioning method is widely used in areas where no satellite signals are available. However, during the measurement process of UWB, collected data contain random errors. To alleviate effect errors on accuracy, an improved adaptive sparrow search algorithm (IASSA) based (SSA) proposed this paper by introducing three strategies, namely, two-step weighted least squ...

Web services are provided as reusable software components in the services-oriented architecture. More complicated composite can be combined from these to satisfy user requirements represented a workflow with specified Quality of Service (QoS) limitations. The consists tasks where many considered for each task. Searching optimal combination and optimizing overall QoS limitations is Non-determini...

Augmented Downhill Simplex Method (ADSM) is introduced here, that is a heuristic combination of Downhill Simplex Method (DSM) with Random Search algorithm. In fact, DSM is an interpretable nonlinear local optimization method. However, it is a local exploitation algorithm; so, it can be trapped in a local minimum. In contrast, random search is a global exploration, but less efficient. Here, rand...

  The clustering problem under the criterion of minimum sum of squares is a non-convex and non-linear program, which possesses many locally optimal values, resulting that its solution often falls into these trap and therefore cannot converge to global optima solution. In this paper, an efficient hybrid optimization algorithm is developed for solving this problem, called Tabu-KM. It gathers the ...