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A note on some inequalities for the $b$-numerical radius and $b$-norm in 2-Hilbert space operators
Akram Babri Bajmaeh,Mohsen Erfanian Omidvar 강원경기수학회 2019 한국수학논문집 Vol.27 No.1
In this paper, the definition $b$-numerical radius and $b$-norm is introduced and we present several $b$-numerical radius inequalities. Some applications of these inequalities are considered as well.
Sharpening lower bound in some inequalities for frames in Hilbert spaces
Fahimeh Sultanzadeh,Mahmood Hassani,Mohsen Erfanian Omidvar,Rajab Ali Kamyabi Gol 강원경기수학회 2021 한국수학논문집 Vol.29 No.4
This paper aims to present a new lower bound for some inequalities related to Frames in Hilbert space. Some refinements of the inequalities for general frames and alternate dual frames under suitable conditions are given. These results refine the remarkable results obtained by Balan et al. and Gavruta.
TRIPLE CENTRALIZERS OF C<sup>*</sup> -ALGEBRAS
Davarpanah, Seyed Mohammad,Omidvar, Mohsen Erfanian,Moradi, Hamid Reza The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.4
In this paper, we extend the concept of double centralizer to triple centralizer and we show that, the triple centralizer is a $C^*$-algebra. Some algebraic properties are investigated.
Zare, Sajad,Baneshi, Mohammad R.,Hemmatjo, Rasoul,Ahmadi, Saeid,Omidvar, Mohsen,Dehaghi, Behzad F. Occupational Safety and Health Research Institute 2019 Safety and health at work Vol.10 No.1
Background: In both developed and developing countries, noise is regarded as the most common occupational hazard in various industries. The present study aimed to examine the effect of sound pressure level (SPL) on serum cortisol concentration in three different times during the night shift. Methods: This case-control study was conducted among 75 workers of an industrial and mining firm in 2017. The participants were assigned to one of the three groups (one control and two case groups), with an equal number of workers (25 participants) in each group. Following the ISO 9612 standard, dosimetry was adopted to evaluate equivalent SPL using a TES-1345 dosimeter. The influence of SPL on serum cortisol concentration was measured during the night shift. The serum cortisol concentration was measured using a radioimmunoassay (RIA) test in the laboratory. Repeated measure analysis of variance and linear mixed models were used with ${\alpha}=0.05$. Results: The results indicated a downward trend in the serum cortisol concentration of the three groups during the night shift. Both SPL and exposure time significantly affected cortisol concentration (p < 0.0001, p < 0.0001). Conversely, age and body mass index had no significant influence on cortisol concentration (p = 0.360, p = 0.62). Conclusion: Based on the obtained results, increasing SPL will lead to enhancement of serum cortisol concentration. Given that cortisol concentration varies while workers are exposed to different SPLs, this hormone can be used as a biomarker to study the effect of noise-induced stress.
Sajad Zare,Mohammad R. Baneshi,Rasoul Hemmatjo,Saeid Ahmadi,Mohsen Omidvar,Behzad F. Dehaghi 한국산업안전보건공단 산업안전보건연구원 2019 Safety and health at work Vol.10 No.1
Background: In both developed and developing countries, noise is regarded as the most common occupational hazard in various industries. The present study aimed to examine the effect of sound pressure level (SPL) on serum cortisol concentration in three different times during the night shift. Methods: This caseecontrol study was conducted among 75 workers of an industrial and mining firm in 2017. The participants were assigned to one of the three groups (one control and two case groups), with an equal number of workers (25 participants) in each group. Following the ISO 9612 standard, dosimetry was adopted to evaluate equivalent SPL using a TES-1345 dosimeter. The influence of SPL on serum cortisol concentration was measured during the night shift. The serum cortisol concentration was measured using a radioimmunoassay (RIA) test in the laboratory. Repeated measure analysis of variance and linear mixed models were used with a ¼ 0.05. Results: The results indicated a downward trend in the serum cortisol concentration of the three groups during the night shift. Both SPL and exposure time significantly affected cortisol concentration (p < 0.0001, p < 0.0001). Conversely, age and body mass index had no significant influence on cortisol concentration (p ¼ 0.360, p ¼ 0.62). Conclusion: Based on the obtained results, increasing SPL will lead to enhancement of serum cortisol concentration. Given that cortisol concentration varies while workers are exposed to different SPLs, this hormone can be used as a biomarker to study the effect of noise-induced stress.