Developing a Multi-objective Mathematical Model for Dynamic Cellular Manufacturing Systems

This paper is in search of designing the cellular manufacturing systems (CMSs) under dynamic and flexible environment. CM is proper for small-to-medium lot production environment that helps the companies to produce variable kind of productions with at least scraps. The most important benefits of CM are decline in material handling, reduction in work-in-process, reduction in set-up time, increment in flexibility, improved quality, and shorter lead time. In this research A multi-objective mixed integer model is presented that considers some real-world critical conditions same as costs of multi-period cell formation and production planning , human resource assignment to cells and balancing workload of cells. This model groups the parts and machines concurrently with labor assignment This study aims to 1) minimize various costs including reassignment cost of human resource, the batch inter-cell material handling cost, constant and variable cost of machines, relocation and purchase cost of machines, 2) minimize cell load variation and 3) maximize utilization rate of human resource. The model is complicate, so it is verified with Lingo 8. 0. Soft ware. Since particle swarm optimization approach less than many other metaheuristic approaches have been applied to solve multi-objective CMS problems so far, we utilize this method to solve our model. The results are presented at the last part

The Effectiveness of the Anteroom (Vestibule) Area on Hospital Infection Control and Health Staff Safety: A Systematic Review

The emergence of SARS-CoV2 in 2019 showed again that the world's healthcare system is not fully equipped and well-designed for preventing the transmission of nosocomial respiratory infections. One of the great tools for preventing the spread of infectious organisms in hospitals is the anteroom. Several articles have investigated the role of the anteroom in disease control but the lack of a comprehensive study in this field prompted us to provide more in-depth information to fill this gap. Also, this study aimed to assess the necessity to construct an anteroom area for hospital staff members at the entrance of each ward of the hospital, and specify the equipment and facilities which make the anteroom more efficient. Articles were identified through searches of Scopus, Web of Sciences, PubMed, and Embase for studies published in English until May 2020 reporting data on the effect of the anteroom (vestibule) area in controlling hospital infections. Data from eligible articles were extracted and presented according to PRISMA's evidence-based data evaluation search strategy. Also, details around the review aims and methods were registered with the PROSPERO. From the database, 209 articles were identified, of which 25 studies met the study criteria. Most studies demonstrated that an anteroom significantly enhances practical system efficiency. The results showed that the equipment such as ventilation system, high-efficiency particulate absorption filter, hand dispensers, alcohol-based disinfection, sink, mirror, transparent panel, UVC disinfection, and zone for PPE change, and parameters like temperature, door type, pressure, and size of the anteroom are factors that are effective on the safety of the hospital environment. Studies demonstrated that providing an anteroom for changing clothing and storing equipment may be useful in reducing the transmission of airborne infections in hospitals. Since the transmission route of SARS-CoV2 is common with other respiratory infectious agents, it can be concluded that a well-designed anteroom could potentially decrease the risk of SARS-CoV2 transmission during hospitalization as well.publishedVersio

A New Image Analysis Based Method for Measuring Electrospun Nanofiber Diameter

In this paper, a new image analysis based method for electrospun nanofiber diameter measurement has been presented. The method was tested by a simulated image with known characteristics and a real web. Mean (M) and standard deviation (STD) of fiber diameter obtained using this method for the simulated image were 15.02 and 4.80 pixels respectively, compared to the true values of 15.35 and 4.47 pixels. For the real web, applying the method resulted in M and STD of 324 and 50.4 nm which are extremely close to the values of 319 and 42 nm obtained using manual method. The results show that this approach is successful in making fast, accurate automated measurements of electrospun fiber diameters

Magnetized Chitosan Hydrogel and Silk Fibroin, Reinforced with PVA: A Novel Nanobiocomposite for Biomedical and Hyperthermia Applications

Herein, a multifunctional nanobiocomposite was designed for biological application, amongst which hyperthermia cancer therapy application was specifically investigated. This nanobiocomposite was fabricated based on chitosan hydrogel (CS), silk fibroin (SF), water-soluble polymer polyvinyl alcohol (PVA) and iron oxide magnetic nanoparticles (Fe3O4 MNPs). CS and SF as natural compounds were used to improve the biocompatibility, biodegradability, adhesion and cell growth properties of the nanobiocomposite that can prepare this nanocomposite for the other biological applications such as wound healing and tissue engineering. Since the mechanical properties are very important in biological applications, PVA polymer was used to increase the mechanical properties of the prepared nanobiocomposite. All components of this nanobiocomposite have good dispersion in water due to the presence of hydrophilic groups such as NH2, OH, and COOH, which is one of the effective factors in increasing the efficiency of hyperthermia cancer therapy. The structural analyzes of the hybrid nanobiocomposite were determined by FT-IR, XRD, EDX, FE-SEM, TGA and VSM. Biological studies such as MTT and hemolysis testing proved that it is hemocompatible and non-toxic for healthy cells. Furthermore, it can cause the death of cancer cells to some extent (20.23%). The ability of the nanobiocomposites in hyperthermia cancer therapy was evaluated. Also, the results showed that it can be introduced as an excellent candidate for hyperthermia cancer therapy

Fabrication of conducting elastomeric composite fibres

Conducting elastomeric fibres provide essential building blocks for strain sensor textiles. In this thesis, a number of strategies are studied leading to the fabrication of conducting elastomeric composite fibres for strain sensing applications. To reach this goal, fibres are required that are not only highly electrically conducting but also possess outstanding mechanical properties to permit integration into larger assembled structures such as textiles. It is, however, a challenge to retain the high stretchability of an elastomer when used in polymer composites. Likewise, the high conductivity of organic conductors is typically compromised when used as filler in composite systems. In this thesis, it is demonstrated that it is possible to mitigate these undesirable effects and achieve elastomeric fibre composites with high electrical conductivity and more importantly, attain mechanical properties that are useful for strain sensing applications..

Strain-responsive polyurethane/PEDOT:PSS elastomeric composite fibers with high electrical conductivity

It is a challenge to retain the high stretchability of an elastomer when used in polymer composites. Likewise, the high conductivity of organic conductors is typically compromised when used as filler in composite systems. Here, it is possible to achieve elastomeric fiber composites with high electrical conductivity at relatively low loading of the conductor and, more importantly, to attain mechanical properties that are useful in strain-sensing applications. The preparation of homogenous composite formulations from polyurethane (PU) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) that are also processable by fiber wet-spinning techniques are systematically evaluated. With increasing PEDOT:PSS loading in the fiber composites, the Young\u27s modulus increases exponentially and the yield stress increases linearly. A model describing the effects of the reversible and irreversible deformations as a result of the re-arrangement of PEDOT:PSS filler networks within PU and how this relates to the electromechanical properties of the fibers during the tensile and cyclic stretching is presented. Conducting elastomeric fibers based on a composite of polyurethane (PU) and PEDOT:PSS, produced by a wet-spinning method, have high electrical conductivity and stretchability. These fibers can sense large strains by changes in resistance. The PU/PEDOT:PSS fiber is optimized to achieve the best strain sensing. PU/PEDOT:PSS fibers can be produced on a large scale and integrated into conventional textiles by weaving or knitting. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Tube-MPC for a class of uncertain continuous nonlinear systems with application to surge problem

summary:This paper presents a new robust adaptive model predictive control for a special class of continuous-time non-linear systems with uncertainty. These systems have bounded disturbances with unknown upper bound, as well as constraints on input states. An adaptive control is used in the new controller to estimate the system uncertainty. Also, to avoid the system disturbances, a $H_{\infty }$ method is employed to find the appropriate gain in Tube-MPC. Finally, a surge avoidance problem in centrifugal compressors is solved to show the efficiency and effectiveness of the proposed algorithm

بررسی تاثیر هوش معنوی بر کارآیی کارکنان سلامت بخش اورژانس مرکز آموزشی تحقیقاتی و درمانی پورسینا، دانشگاه علوم پزشکی گیلان

Introduction: Spiritual intelligence leads to understanding between people, calmness, and management of changes. The spiritual intelligence of emergency personnel May affects the correct performance of emergency procedures. This type of intelligence exists in all people, but due to the challenging working conditions of medical staff in the emergency department and the need to do the best work at the best time, it Can be more important. The objective of this study was to evaluate the effect of spiritual intelligence on efficacy of health personnel in the emergency department. Methods: This study was a descriptive cross-sectional study that was performed on 83 medical personnel working in the emergency department of Poursina educational, research and therapeutic center, in Rasht, Iran, in 2021. The sampling method was census. The data were collected using a tool that consisted of demographic characteristics and King's questionnaire. Data were analyzed using SPSS24 software and descriptive statistical methods (frequency, percentage, mean and standard deviation) and Kolmogorov-Smirnov, independent T-test, Pearson test and analysis of variance. The significance level was considered P <0.05. Results: The mean age of the research participants was 29.15±7.39 years and 47 (56.6%) of participants were female. The findings of the present study showed that people with higher spiritual intelligence had better occupational efficiency than others (P<0.001), but there was no statistically significant relationship between spiritual intelligence with age, sex, marital status, and education. Conclusion: Medical personnel who had higher spiritual intelligence were more efficient than others. Apart from the effect of spiritual intelligence on reducing people's stress, improving the spiritual intelligence of personnel in critical departments such as emergency can increase their efficiency, especially in difficult situations that require management.مقدمه: هوش معنوی باعث تفاهم بین افراد، ایجاد آرامش و مدیریت تغییرات می­شود. هوش معنوی کارکنان اورژانس نسبت به انجام درست اقدامات اورژانسی، تاثیرگذار است. این نوع از هوش در تمام افراد وجود دارد ولی به علت حساسیت شغلی کارکنان اورژانس و ضرورت انجام بهترین کار در بهترین زمان دارای اهمیت بیشتری است. هدف از انجام این مطالعه، بررسی تاثیر هوش معنوی بر کارآیی کارکنان سلامت بخش اورژانس بود. روش مطالعه: مطالعه از نوع توصیفی مقطعی بود که روی 83 نفر از کارکنان سلامت بخش اورژانس مرکز آموزشی تحقیقاتی و درمانی پورسینای رشت در سال 1400 انجام شد. روش نمونه­گیری به صورت سرشماری بود. ابزار گردآوری اطلاعات در این مطالعه شامل، مشخصات دموگرافیک و پرسشنامه کینگ (King) بود. داده­ها با استفاده از نرم­افزار SPSS24 و روش های آماری توصیفی (فراوانی و درصد، میانگین و انحراف معیار)  و آزمون کلموگروف اسمیرنوف، T مستقل، پیرسون و آنالیز واریانس تحلیل شد و سطح معنی­داری 05/0>P تلقی شد. یافته ها: میانگین سنی افراد مورد بررسی 39/7±15/29 سال و 47 نفر (6/56%) زن بود. یافته های مطالعه حاضر نشان داد که افرادی که از هوش معنوی بالاتری برخوردار هستند، کارایی بهتری نسبت به دیگر افراد دارند (001/0>P). اما هوش معنوی با سن، جنس، تاهل و سطح تحصیلات ارتباط معنی­دار آماری نداشت. نتیجه­گیری: کارکنان درمانی که از هوش معنوی بالاتری برخوردارند، کارایی بهتری نسبت به دیگران دارند. جدای از تاثیر هوش معنوی بر کاهش استرس، ارتقای هوش معنوی کارکنان بخش های حیاتی بیمارستان مانند اورژانس، می­تواند باعث افزایش کارایی آنان به خصوص در شرایط سخت و نیازمند مدیریت شود

The Effectiveness of the Anteroom (Vestibule) Area on Hospital Infection Control and Health Staff Safety: A Systematic Review

The emergence of SARS-CoV2 in 2019 showed again that the world's healthcare system is not fully equipped and well-designed for preventing the transmission of nosocomial respiratory infections. One of the great tools for preventing the spread of infectious organisms in hospitals is the anteroom. Several articles have investigated the role of the anteroom in disease control but the lack of a comprehensive study in this field prompted us to provide more in-depth information to fill this gap. Also, this study aimed to assess the necessity to construct an anteroom area for hospital staff members at the entrance of each ward of the hospital, and specify the equipment and facilities which make the anteroom more efficient. Articles were identified through searches of Scopus, Web of Sciences, PubMed, and Embase for studies published in English until May 2020 reporting data on the effect of the anteroom (vestibule) area in controlling hospital infections. Data from eligible articles were extracted and presented according to PRISMA's evidence-based data evaluation search strategy. Also, details around the review aims and methods were registered with the PROSPERO. From the database, 209 articles were identified, of which 25 studies met the study criteria. Most studies demonstrated that an anteroom significantly enhances practical system efficiency. The results showed that the equipment such as ventilation system, high-efficiency particulate absorption filter, hand dispensers, alcohol-based disinfection, sink, mirror, transparent panel, UVC disinfection, and zone for PPE change, and parameters like temperature, door type, pressure, and size of the anteroom are factors that are effective on the safety of the hospital environment. Studies demonstrated that providing an anteroom for changing clothing and storing equipment may be useful in reducing the transmission of airborne infections in hospitals. Since the transmission route of SARS-CoV2 is common with other respiratory infectious agents, it can be concluded that a well-designed anteroom could potentially decrease the risk of SARS-CoV2 transmission during hospitalization as well