Autor: Arora, R. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Branch and bound algorithm for discrete multi- level linear fractional programming problem
Autorzy:: Arora, R.
Gupta, K.
Tematy:: linear fractional programming problem
bilevel programming
multilevel programming
discrete variables
integer solution
branch and bound cut
programowanie dwustopniowe
programowanie wielopoziomowe
zmienne dyskretne; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/406478.pdf Link otwiera się w nowym oknie
Opis:: An algorithm is proposed to find an integer solution for bilevel linear fractional programming problem with discrete variables. The method develops a cut that removes the integer solutions which are not bilevel feasible. The proposed method is extended from bilevel to multilevel linear fractional programming problems with discrete variables. The solution procedure for both the algorithms is elucidated in the paper.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Fuzzy goal programming technique for multi-objective indefinite quadratic bilevel programming problem
Autorzy:: Arora, R.
Gupta, K.
Tematy:: bilevel programming
indefinite quadratic programming
multi-objective programming
pay-off matrix
Taylor series approximation
LINGO 17.0; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1403683.pdf Link otwiera się w nowym oknie
Opis:: Bilevel programming problem is a non-convex two stage decision making process in which the constraint region of upper level is determined by the lower level problem. In this paper, a multi-objective indefinite quadratic bilevel programming problem (MOIQBP) is presented. The defined problem (MOIQBP) has multi-objective functions at both the levels. The followers are independent at the lower level. A fuzzy goal programming methodology is employed which minimizes the sum of the negative deviational variables of both the levels to obtain highest membership value of each of the fuzzy goal. The membership function for the objective functions at each level is defined. As these membership functions are quadratic they are linearized by Taylor series approximation. The membership function for the decision variables at both levels is also determined. The individual optimal solution of objective functions at each level is used for formulating an integrated pay-off matrix. The aspiration levels for the decision makers are ascertained from this matrix. An algorithm is developed to obtain a compromise optimal solution for (MOIQBP). A numerical example is exhibited to evince the algorithm. The computing software LINGO 17.0 has been used for solving this problem.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 3.

Tytuł:: Perception of dental practitioners regarding the use of antioxidants in oral health
Autorzy:: Randhawa, R.K.
Gupta, N.
Bansal, M.
Arora, V.
Gupta, P.
Thakar, S.
Tematy:: perception
dental health
antioxidant
free radical
mouth cancer
oral health; Pokaż więcej
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Powiązania:: https://bibliotekanauki.pl/articles/875829.pdf Link otwiera się w nowym oknie
Opis:: Background. Free radicals play a key role in the development of several pathological conditions. Therefore, antioxidants (AOs) are the first line of defense against free radical damage and are critical for maintaining optimum health and wellbeing. Objectives: To assess the perception of dental practitioners regarding use of antioxidants in oral health. Method. A cross-sectional questionnaire study was conducted among 296 dental practitioners in Tricity (Chandigarh, Mohali, Panchkula, India). A self-structured close-ended questionnaire was used to assess the perception of dentists regarding the use of antioxidants in their patients. It consisted of 12 questions with dichotomous response and five point likert scale ranging from strongly agree to strongly disagree. Descriptive statistics were used to summarize the data, followed by the Chi-square test to check significant differences between the responses. Correlation between responses were analysed through the Spearman’s rank correlation. Statistical analysis was done using Statistical Package for Social Sciences version 20 (Illinois, Chicago, USA). Results. A statistically significant difference was observed between genders, with females 181 (61%) having more knowledge than males 115 (39%) regarding the use of antioxidants in their clinical practice. It has been found that dental professionals in academics prescribes more antioxidants to their patients than the private practitioners. Postgraduates 76 (77.6%) had a higher level of knowledge than graduates 86 (43%). Conclusions. Knowledge about antioxidants should be highlighted in the health sciences curriculum. It is recommended to expand the use of antioxidants in oral health to bring down the burden of chronic diseases like periodontitis and catastrophic diseases like precancerous lesions and oral cancer.
Dostawca treści:: Biblioteka Nauki