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In this paper, after applying Response Surface Methodology (RSM) for Robust Parameter Design, we take into account two equations representing the mean and variance responses. Then, the control factors are determined such that these two objective functions are close to their ideal values. In this regard, the Lp method is used and its sensitivity analysis is accomplished through a numerical example for the larger- the better case. Moreover, in this study the impact of ignoring uncontrollable noise factors in estimation of the optimum points are investigated.

Location theory is an interstice field of optimization and operations research. In the classic location problem, the goal is finding the location of one or more facilities such that some criteria such as transportation cost, the sum of distances passed by clients, total service time and cost of servicing are minimized. In this paper, we consider the goal location problem. In the goal location problem, the ideal is locating the facility in the distances ri, from the i-th client. However, in the most instances, the solution of this problem doesn’ t exist. Therefore, we consider the minimizing of distances between clients and ideal point. The minimizing sum of square errors and minimizing absolute errors under Lp norm are considered as the objective function. We use the Weiszfeld like, Gauss-Newton and imperialist competitive algorithms for solving the problem. Then we compare the results which obtained by these methods for some test problems.

Background and Purpose: Lipoid Proteinosis (LP) is a rare hereditary progressive disorder caused by a disorder of collagen metabolism. In LP, hyaline deposits in mucous membrane of true vocal folds causes hoarseness. The studies on the laryngeal and voice features of patients with LP are rare. To the best of our knowledge, this is the first research to study acoustic and perceptual voice features in two Iranian children with LP.Materials and Methods: Two children (siblings) were assessed. The main voice complaint was hoarseness. Voice samples were recorded and acoustically analyzed by Praat. Furthermore, perceptual voice assessment was performed according to the GRBAS scale.Results: Acoustic measurement represented increase in f0, jitter, and shimmer in both children. Furthermore, mean scores of the GRBAS for all voice parameters were more than 60. Conclusion: Current study is the first research that describes the voice features of Persian subjects with LP. Comprehensive understanding of the etiology in voice problems helps speech and language pathologists to provide appropriate clinical services considering the nature of pathological condition to clients.

In this paper, optimization of a linear objective func-tion with fuzzy relational inequality constraints is in-vestigated where the feasible region is formed as the in-tersection of two inequality fuzzy systems and Dombi family of t-norms is considered as fuzzy composition. Dombi family of t-norms includes a parametric family of continuous strict t-norms, whose members are increas-ing functions of the parameter. This family of t-norms covers the whole spectrum of t-norms when the param-eter is changed from zero to in nity. The resolution of the feasible region of the problem is  rstly investigated when it is de ned with max-Dombi composition. Based on some theoretical results, a necessary and su cient condition and three other necessary conditions are de-rived for determining the feasibility. Moreover, in order to simplify the problem, some procedures are presented.