Four Search Method Obtaining the Conjugating Direction Along the Negative Gradient Directions

2021 ◽  
Author(s):  
Dongxia Hu ◽  
Xiaoli Yin ◽  
Chunming Li
Keyword(s):  
Search Method ◽  
Negative Gradient

scholarly journals A nonmonotone line search method for stochastic optimization problems

Filomat ◽  
2018 ◽  
Vol 32 (19) ◽  
pp. 6799-6807
Author(s):  
Natasa Krejic ◽  
Sanja Loncar
Keyword(s):  
Objective Function ◽  
Line Search ◽  
Optimization Problems ◽  
Search Method ◽  
Nonmonotone Line Search ◽  
Unconstrained Optimization Problems ◽  
Convergence Results ◽  
Line Search Method ◽  
Upper Density ◽  
Negative Gradient

A nonmonotone line search method for solving unconstrained optimization problems with the objective function in the form of mathematical expectation is proposed and analyzed. The method works with approximate values of the objective function obtained with increasing sample sizes and improves accuracy gradually. Nonmonotone rule significantly enlarges the set of admissible search directions and prevents unnecessarily small steps at the beginning of the iterative procedure. The convergence is shown for any search direction that approaches the negative gradient in the limit. The convergence results are obtained in the sense of zero upper density. Initial numerical results confirm theoretical results and show efficiency of the proposed approach.

The methods of a research of processes of spontaneous socialization based on post-nonclassical approach

2020 ◽  
Vol 22 (10) ◽  
pp. 4-8
Author(s):  
Raschetina S.A.
Keyword(s):  
Social Reality ◽  
Social Situation ◽  
Search Method ◽  
Detailed Design ◽  
The Social ◽  
The Cross

The detailed design implemented according to a grant of the Russian Federal Property Fund is focused on the solution of the cross-disciplinary humanitarian problem connected with the analysis of purposeful and sponta-neous processes of socialization of the child, and specif-ic characteristics of the social and pedagogical activity aimed at harmonization of the relations "the child - so-ciety" in modern unstable public conditions. The frag-ment of a research of processes of spontaneous sociali-zation of the child connected with the estimated dis-course presented in a social situation of its development is reflected in article. In it short characteristic of the post-nonclassical methodology focused on the analysis of chaotic conditions of social reality and essence of the person who acts as the language personality who is not existing "to language" is presented. Possibilities of post-nonclassical methodology in a research of a phenome-non purposeful - spontaneous socialization of the child are characterized. In article the specifics of the social and pedagogical activity aimed at harmonization of the relations "the child - society are disclosed from a posi-tion of post-nonclassical approach", the place of a re-search method in its structure is revealed.

Enhanced Google-Based Semantic Category Search

2015 ◽  
Vol 1 (4) ◽  
pp. 398
Author(s):  
Mohammed Adeeb ◽  
Ahmed Sleman ◽  
Sumaya Abdullah ◽  
Belal Al-Khateeb
Keyword(s):  
Search Engines ◽  
Semantic Category ◽  
Search Method ◽  
Research Directions ◽  
The Social ◽  
Category Search

Recently search services have been developed rapidly especially when the social internet appeared. It can help web users easily find their documents. So that it is very difficult to find a best search method. This paper aims to enhance the quality of the search engines results and this can be done by adding a second level category search that is able to search for the keyword and its synonyms, which enables the search engines to get more users queries related results. The proposed method showed promising results that will open further research directions

Automatic Mining of Quantitative Association Rules with Gravitational Search Algorithm

2017 ◽  
Vol 27 (03) ◽  
pp. 343-372 ◽  
Author(s):  
Umit Can ◽  
Bilal Alatas
Keyword(s):  
Association Rules ◽  
Optimization Problems ◽  
Search Algorithm ◽  
Fitness Function ◽  
Optimization Algorithms ◽  
Gravitational Search Algorithm ◽  
Search Space ◽  
Search Method ◽  
Quantitative Association Rules ◽  
Gravitational Search

The classical optimization algorithms are not efficient in solving complex search and optimization problems. Thus, some heuristic optimization algorithms have been proposed. In this paper, exploration of association rules within numerical databases with Gravitational Search Algorithm (GSA) has been firstly performed. GSA has been designed as search method for quantitative association rules from the databases which can be regarded as search space. Furthermore, determining the minimum values of confidence and support for every database which is a hard job has been eliminated by GSA. Apart from this, the fitness function used for GSA is very flexible. According to the interested problem, some parameters can be removed from or added to the fitness function. The range values of the attributes have been automatically adjusted during the time of mining of the rules. That is why there is not any requirements for the pre-processing of the data. Attributes interaction problem has also been eliminated with the designed GSA. GSA has been tested with four real databases and promising results have been obtained. GSA seems an effective search method for complex numerical sequential patterns mining, numerical classification rules mining, and clustering rules mining tasks of data mining.

scholarly journals Role of social integration in the protection against depression in the Chilean elderly population

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
L de Albuquerque Araújo ◽  
N Bello Escamilla ◽  
V Sabando Franulic
Keyword(s):  
Mental Health ◽  
Older Adults ◽  
Social Integration ◽  
Old Age ◽  
Protective Factor ◽  
Depression Scale ◽  
Mental Illnesses ◽  
National Study ◽  
Close Relatives ◽  
Negative Gradient

Abstract Chile has improved survival however this process occurs under a framework of socioeconomic and gender inequalities, which results in an impact of mental health, especially in vulnerable groups. The objective was to determine the association between depression and social integration in Chilean older adults. Cross-sectional study from the National Study of Dependence in Old Person 2010. The risk of depression was amount with Geriatric Depression Scale (>5). The social integration were quantity as frequency of meeting with close relatives (child, partner, daughter/ son-in-law, grandchildren); with other relatives (brother, brothers-in-law, nephews or other relatives) and with friends and neighbors in the last 12 months in 5 categories (never visit; less frequently; 1-2 times a month; 1-2 times a week; every day or almost). Logistic regression models considered the sampling design of the survey to identify association with odd ratio (OR) (never as reference category), adjustment for sex, age, ethnicity, household income, education, housing arrangement and chronic diseases (p ≤ 0,5). Total of 4179 older adults 25,3% reported risk of depression, the significative association with close relatives was in daily or almost frequency OR:0.42 (95%CI 0.27-0.67), 1-2 times a week OR: 0,57 (95%CI 0,33-0,99), 1-2 times/month OR: 0,56 (95%CI 0,99); other relatives were lower frequency OR: 0.54 (95%CI 0.38-0.78); 1-2 times/month OR; 0.50 (95%CI 0.31-0.81); 1-2 times/week OR:0.35 (95%CI 0.22-0.55); daily or almost OR:0.27 (95%CI 0.18-0.42). And meeting with friends and neighbors in the same frequency order were OR: 0.66 (95%CI 0.44-0.99); OR:0.43 (95%CI 0.26-0.73); OR:0.4 (95%CI 0.25-0.62); OR: 0.32 (95%CI 0.21-0.47). There is a negative gradient between depression and the frequency of meeting with friends, neighbors and family, independent of sociodemographic and health characteristics. Social integration must be promoted as a protective factor of mental health in elderly. Key messages Depression is one of the most common mental illnesses in old age and we found a negative gradient between the frequency of meeting friends, neighbors and family and the possibility of depression. It seems essential for public health to have strategies that address social life in old age to strengthen quality of live and mental health.

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