The quadratic penalty function is considered for finding the weighted analytic center ofa polytope.By an-alyzing the properties of the penalty function,an exterior central path is introduced.It is shown that the exter...The quadratic penalty function is considered for finding the weighted analytic center ofa polytope.By an-alyzing the properties of the penalty function,an exterior central path is introduced.It is shown that the exterior cen-tral path has some similar properties as the interior one in a line ar programming case,If the starting point is close to the path,by following the path with an appropriate step,a polynomia1 algorithm is derived.Usually,the starting point is not in the polytope,the method can be seen as an infeasible interior point one.It is also discussed how to get an appropriate starting point.展开更多
Background： Eating disorders （EDs） are serious illnesses associated with medical complications and have been increased, especially among societies with an excessive concern about weight, shape, or appearance. This ...Background： Eating disorders （EDs） are serious illnesses associated with medical complications and have been increased, especially among societies with an excessive concern about weight, shape, or appearance. This study aimed to investigate the prevalence of EDs among the individuals attending weight management centers and its associated factors. Methods： A cross-sectional study was carried out among individuals attending four weight management centers in Tanta, Gharbia Governorate, Egypt during the period from July to December 2016. Precoded interview questionnaires were used to identify the following data： sociodemographic characteristics and medical history of depression or psychological disorders and the Eating Attitude Test （EAT-40） was used to assess the attitudes, behavior, and traits associated with the EDs. Results： A total of 400 participants （I 12 males and 288 females） were included in the study. According to EAT-40 questionnaires, the prevalence of positive and negative EDs was 65.0% （n = 260） and 35.0% （n = 140）, respectively. EDs were more likely reported by females, married singles, rural residents, those with higher education, and nonworking or part-time working patients, those who were overweight or obese, and who were suffering from depression or any psychological problems. Logistic regression analysis revealed that the independent predictors of EDs were age （adjusted odds ratio [OR]： 1.06）, nonworking （adjusted OR： 2.32） or part-time working （adjusted OR： 2,18）, increased body weight （adjusted OR： 2.66 for overweight and adjusted OR： 1.24 for obese）, and having a history of depression or any psychological problem （adjusted OR： 2.76）. Factor analysis of EAT-40 revealed four factors （eating behavior, diet-related lifestyle, weight concern, and food preoccupation） that were responsible for 33.2% of the total variance. Conclusions： EDs are prevalent among individuals attending the weight management centers in a northern city in Egypt. Specific management strategies are warranted to address this commonly prevalent disease.展开更多
文摘The quadratic penalty function is considered for finding the weighted analytic center ofa polytope.By an-alyzing the properties of the penalty function,an exterior central path is introduced.It is shown that the exterior cen-tral path has some similar properties as the interior one in a line ar programming case,If the starting point is close to the path,by following the path with an appropriate step,a polynomia1 algorithm is derived.Usually,the starting point is not in the polytope,the method can be seen as an infeasible interior point one.It is also discussed how to get an appropriate starting point.
文摘Background： Eating disorders （EDs） are serious illnesses associated with medical complications and have been increased, especially among societies with an excessive concern about weight, shape, or appearance. This study aimed to investigate the prevalence of EDs among the individuals attending weight management centers and its associated factors. Methods： A cross-sectional study was carried out among individuals attending four weight management centers in Tanta, Gharbia Governorate, Egypt during the period from July to December 2016. Precoded interview questionnaires were used to identify the following data： sociodemographic characteristics and medical history of depression or psychological disorders and the Eating Attitude Test （EAT-40） was used to assess the attitudes, behavior, and traits associated with the EDs. Results： A total of 400 participants （I 12 males and 288 females） were included in the study. According to EAT-40 questionnaires, the prevalence of positive and negative EDs was 65.0% （n = 260） and 35.0% （n = 140）, respectively. EDs were more likely reported by females, married singles, rural residents, those with higher education, and nonworking or part-time working patients, those who were overweight or obese, and who were suffering from depression or any psychological problems. Logistic regression analysis revealed that the independent predictors of EDs were age （adjusted odds ratio [OR]： 1.06）, nonworking （adjusted OR： 2.32） or part-time working （adjusted OR： 2,18）, increased body weight （adjusted OR： 2.66 for overweight and adjusted OR： 1.24 for obese）, and having a history of depression or any psychological problem （adjusted OR： 2.76）. Factor analysis of EAT-40 revealed four factors （eating behavior, diet-related lifestyle, weight concern, and food preoccupation） that were responsible for 33.2% of the total variance. Conclusions： EDs are prevalent among individuals attending the weight management centers in a northern city in Egypt. Specific management strategies are warranted to address this commonly prevalent disease.
