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Shirali, Gholamabbas,Shekari, Mohammad,Angali, Kambiz Ahmadi Occupational Safety and Health Research Institute 2018 Safety and health at work Vol.9 No.3
Background: Safety culture, acting as the oil necessary in an efficient safety management system, has its own weaknesses in the current conceptualization and utilization in practice. As a new approach, resilience safety culture (RSC) has been proposed to reduce these weaknesses and improve safety culture; however, it requires a valid and reliable instrument to be measured. This study aimed at evaluating the reliability and validity of such an instrument in measuring the RSC in sociotechnical systems. Methods: The researchers designed an instrument based on resilience engineering principles and safety culture as the first instrument to measure the RSC. The RSC instrument was distributed among 354 staff members from 12 units of an anonymous petrochemical plant through hand delivery. Content validity, confirmatory, and exploratory factor analysis were used to examine the construct validity, and Cronbach alpha and test-retest were employed to examine the reliability of the instrument. Results: The results of the content validity index and content validity ratio were calculated as 0.97 and 0.83, respectively. The explanatory factor analysis showed 14 factors with 68.29% total variance and 0.88 Kaiser-Meyer-Olkin index. The results were also confirmed with confirmatory factor analysis (relative Chi-square = 2453.49, Root Mean Square Error of Approximation = 0.04). The reliability of the RSC instrument, as measured by internal consistency, was found to be satisfactory (Cronbach ${\alpha}=0.94$). The results of test-retest reliability was r = 0.85, p < 0.001. Conclusion: The results of the study suggest that the measure shows acceptable validity and reliability.
Hadi Shirali,Mehdi Rafizadeh,Faramarz Afshar Taromi 한국고분자학회 2015 Macromolecular Research Vol.23 No.8
A series of novel random copolymers of poly(butylene succinate-co-ethylene terephthalate) were synthesized and characterized in terms of thermal and mechanical properties, crystallinity and biodegradability. The composition and microstructure of the prepared copolyesters were characterized by 1H NMR and 13C NMR, respectively. It was seen that the PBS sequence length decreases with ethylene terephthalate content. All copolymers are semi-crystalline and crystallinity and crystallite size decrease slightly with the comonomer content up to 10%, but the introduction of 20% comonomer leads to decrease the crystallinity up to 29%. The melting temperature of copolyesters decreases with the comonomer content according to the Baur’s equation that indicates only PBS blocks crystallize and crystallite size is decreased with the comonomer content. It was also investigated that the elastic modulus also decreases slightly with the comonomer content. However, the elongation at break increases by 500% due to the decrease in crystallite size and crystallinity. Incorporating non-biodegradable aromatic comonomer has a little effect on copolyester degradability because of the randomness and lower crystallite size.
Gholamabbas Shirali,Mohammad Shekari,Kambiz Ahmadi Angali 한국산업안전보건공단 산업안전보건연구원 2018 Safety and health at work Vol.9 No.3
Background: Safety culture, acting as the oil necessary in an efficient safety management system, has its own weaknesses in the current conceptualization and utilization in practice. As a new approach, resilience safety culture (RSC) has been proposed to reduce these weaknesses and improve safety culture; however, it requires a valid and reliable instrument to be measured. This study aimed at evaluating the reliability and validity of such an instrument in measuring the RSC in sociotechnical systems. Methods: The researchers designed an instrument based on resilience engineering principles and safety culture as the first instrument to measure the RSC. The RSC instrument was distributed among 354 staff members from 12 units of an anonymous petrochemical plant through hand delivery. Content validity, confirmatory, and exploratory factor analysis were used to examine the construct validity, and Cronbach alpha and test-retest were employed to examine the reliability of the instrument. Results: The results of the content validity index and content validity ratio were calculated as 0.97 and 0.83, respectively. The explanatory factor analysis showed 14 factors with 68.29% total variance and 0.88 Kaiser-Meyer-Olkin index. The results were also confirmed with confirmatory factor analysis (relative Chi-square = 2453.49, Root Mean Square Error of Approximation = 0.04). The reliability of the RSC instrument, as measured by internal consistency, was found to be satisfactory (Cronbach a = 0.94). The results of test-retest reliability was r ¼ 0.85, p < 0.001. Conclusion: The results of the study suggest that the measure shows acceptable validity and reliability.
Hadi Shirali,Mehdi Rafizadeh,Faramarz Afshar Taromi 한국고분자학회 2016 Macromolecular Research Vol.24 No.10
New nanocomposites of poly(butylene succinate-co-ethylene terephthalate)/nano hydroxyapatite were synthesized using two-step in situ polycondensation. The composition, microstructure, morphology and dispersion of nanoparticles in the nanocomposites were studied using proton nuclear magnetic resonance (1H NMR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that presence of nano hydroxyapatite catalyzes the reaction and there is a chemical bond between nanoparticles and polymer which leads to a good particle dispersion but it doesn’t affect molecular sequence length. Nanocomposites’ thermal properties evaluated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), showed that crystallinity and crystallite size slightly decrease with the nanoparticles weight fraction. Moreover, the elastic modulus slightly increases and tensile strength and elongation at break decrease with the nanoparticles weight fraction according to dynamic mechanical thermal analysis (DMTA) and tensile analysis. Introducing nano hydroxyapatite increases the hydrolytic degradability dramatically because of the presence of hydrophilic nanoparticle and lower crystallite size.
Advanced Persian/Arabic Anti-SMS-Spam System by Using CAPTCHA
Mohammad Shirali-Shahreza 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Following the development of the Internet, spams become one of the greatest problems in the Internet. Along with the expansion of the Internet, mobile phones are expanding. So the spams are also born on the mobile phones as SMS spams. SMS (Short Message Service) is one of the popular services in mobile phones which is the transfer and exchange of short text messages between mobile phones. So there is needed to create Anti-Spam systems also for the mobile phones. We have been proposed an Anti-SMS-Spam system by using CAPTCHA (Completely Automatic Public Turing Test to Tell Computer and Human Apart) systems for Persian and Arabic users in our previous paper. CAPTCHA systems are used to distinguish between human users and computer programs automatically. In this paper we improve our previous method by applying some changes to that method. These changes increase the resistance of this method to hackers’attacks and make the method free for the receiver.
Foreign Policy Alignment with the War on Terror: The Case of Japan's Foreign Aid Program
John P. Tuman,Jonathan R. Strand,Majid Shirali 동아시아연구원 2017 Journal of East Asian Studies Vol.17 No.3
Many scholars have suggested that Japan aligned its foreign policy with the US War on Terror. Part of Japan’s alignment is said to have involved disbursement of foreign aid to support the US in Afghanistan and Iraq, and with other security interests associated with the War on Terror. To date, however, there has been little empirical study of this question. Employing a data set on Japanese aid to 133 countries between 1995 and 2008, we examine the War on Terror and Japanese ODA. We find that Japanese aid was aligned with some security interests in the War on Terror, but the effects were mixed.