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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of School Administration
- نوع مقاله: Journal Article
- کلمات کلیدی: Phenomenology,Educational quality,Lived experiences,school management excellence program
- چکیده: این مطالعه با هدف واکاوی ادراکات و تجارب مدیران و دبیران مدارس متوسطه شهر سنندج از برنامه تعالی مدیریت مدرسه انجام شد. با عنایت به ضرورت اطلاع عمیق از نحوه برداشت و تجارب زیسته مشارکت کنندگان از ماهیت برنامه تعالی مدیریت مدرسه، سازوکارهای اجرایی، آثار و نتایج و همچنین آسیبهای احتمالی آن، از روش پدیدارشناسی برای انجام پژوهش حاضر بهره گرفته شد. مشارکت کنندگان در این مطالعه 29 نفر از مدیران و دبیران مدارس دوره اول متوسطه در شهر سنندج بودند که به صورت هدفمند انتخاب و با آنها مصاحبه صورت گرفت و یافتههای حاصل با استفاده روش تحلیل دادههای کیفی کلایزی تحلیل گردید. یافتههای پژوهش نشان داد که درک و برداشت مشارکتکنندگان از ماهیت و کم و کیف برنامه تعالی بسته به رویکرد انتقادی و یا محافظه کارانه و بعضاً ستایشگرانه آنها متفاوت است که نهایت در یک مفهوم فراگیر، سه مضمون سازماندهنده سطح دو و سیزده مضمون سازماندهنده سطح یک صورتبندی گردید. براین اساس باوجود اینکه از نظر آنان برنامه تعالی مدیریت مدرسه از نظر ماهیت و ساختار دارای اشکالاتی است اما آثار و نتایجی مثبت و آسیبها و پیامدهایی نیز بر آن مترتب می باشد. این یافته نشان داد که علیرغم مزایایی چون نظمپذیری و فراهم کردن بستری اجرای یکنواخت دستورالعمل طرح تعالی در مدارس، به دلیل ماهیت خطی و تبعیت اجرای چنین برنامه ای از رویکردی تمرکزگرایانه، اجرای آن به شکل فعلی در مدارس بروز آسیبهایی را در نظام آموزش و پرورش اجتناب ناپذیر خواهد کرد.
- چکیده انگلیسی: As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
Keywords: School Management Excellence Program, Educational Quality, Lived Experiences, Phenomenology
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
Keywords: School Management Excellence Program, Educational Quality, Lived Experiences, Phenomenology
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach,s.- انتشار مقاله: 19-01-1399
- نویسندگان: Nematollah Azizi,Hoshyar Fathi,Zahra Hosseini
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of School Administration
- نوع مقاله: Journal Article
- کلمات کلیدی: Phenomenology,Educational quality,Lived experiences,school management excellence program
- چکیده: این مطالعه با هدف واکاوی ادراکات و تجارب مدیران و دبیران مدارس متوسطه شهر سنندج از برنامه تعالی مدیریت مدرسه انجام شد. با عنایت به ضرورت اطلاع عمیق از نحوه برداشت و تجارب زیسته مشارکت کنندگان از ماهیت برنامه تعالی مدیریت مدرسه، سازوکارهای اجرایی، آثار و نتایج و همچنین آسیبهای احتمالی آن، از روش پدیدارشناسی برای انجام پژوهش حاضر بهره گرفته شد. مشارکت کنندگان در این مطالعه 29 نفر از مدیران و دبیران مدارس دوره اول متوسطه در شهر سنندج بودند که به صورت هدفمند انتخاب و با آنها مصاحبه صورت گرفت و یافتههای حاصل با استفاده روش تحلیل دادههای کیفی کلایزی تحلیل گردید. یافتههای پژوهش نشان داد که درک و برداشت مشارکتکنندگان از ماهیت و کم و کیف برنامه تعالی بسته به رویکرد انتقادی و یا محافظه کارانه و بعضاً ستایشگرانه آنها متفاوت است که نهایت در یک مفهوم فراگیر، سه مضمون سازماندهنده سطح دو و سیزده مضمون سازماندهنده سطح یک صورتبندی گردید. براین اساس باوجود اینکه از نظر آنان برنامه تعالی مدیریت مدرسه از نظر ماهیت و ساختار دارای اشکالاتی است اما آثار و نتایجی مثبت و آسیبها و پیامدهایی نیز بر آن مترتب می باشد. این یافته نشان داد که علیرغم مزایایی چون نظمپذیری و فراهم کردن بستری اجرای یکنواخت دستورالعمل طرح تعالی در مدارس، به دلیل ماهیت خطی و تبعیت اجرای چنین برنامه ای از رویکردی تمرکزگرایانه، اجرای آن به شکل فعلی در مدارس بروز آسیبهایی را در نظام آموزش و پرورش اجتناب ناپذیر خواهد کرد.
- چکیده انگلیسی: As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
Keywords: School Management Excellence Program, Educational Quality, Lived Experiences, Phenomenology
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated that despite the advantages such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach, this program essentially opposes with the spirit learning processes in schools as an important cultural institutions.
Keywords: School Management Excellence Program, Educational Quality, Lived Experiences, Phenomenology
As a phenomenological study this paper aims to analyze the perceptions and experiences of principals and teachers of secondary schools in Sanandaj from the school management excellence program. Given the need for in-depth information on how participants perceived and experienced the nature of the School Management Excellence Program, its implementation mechanisms, effects and outcomes, as well as its potential harms, a qualitative phenomenological approach was applied to conduct the study. Participants including 29 principals and teachers of high schools who were purposefully selected and interviewed and the findings were analyzed using qualitative data analysis method. The findings showed that participants' perceptions of the nature and scope of the excellence program vary depending on their critical or conservative and sometimes praiseworthy approach which ultimately formulated in a comprehensive concept, three themes organizing level two and thirteen topics organizing level one. Accordingly, despite the fact that in their opinion, the school management excellence program has some problems in terms of nature and structure, but it also has both positive and negative effects and consequences. This finding indicated such as orderliness and providing a platform for uniform implementation of high school instruction guidelines, due to the linear nature and compliance of such a program with a centralized approach,s.- انتشار مقاله: 19-01-1399
- نویسندگان: Nematollah Azizi,Hoshyar Fathi,Zahra Hosseini
- مشاهده
- جایگاه : پژوهشی
- مجله: Geopersia
- نوع مقاله: Journal Article
- کلمات کلیدی: Zagros basin,Pabdeh Formation,Stable oxygen and carbon isotope,limestone–marl alternations
- چکیده:
- چکیده انگلیسی: Rhythmical alternations between limestone and marls characterize the Pabdeh Formation, southwestern Iran. Three intervals of these rhythmites were studied using sedimentary, petrography and geochemical parameters analysis, to unravel the possible mechanisms responsible for the origin of these rhythmites. The microfacies analysis reflects calm deep-water sedimentation that were interrupted by sporadic traction currents from shallow-marine. The geochemical analysis indicates the primary difference between limestones and marls in interval 1. However, for the intervals 2 and 3, there is no significant difference in the geochemical results between intercalated lithologies. The isotope data (δ18O and δ13C) for limestones and marl rhythms compared with Eocene marine calcite show post depositional alteration. Limestone–marl alternations in the interval 1, therefore, originated from the cyclic changes in siliciclastic input by shallow-water derived currents (probably turbidity currents). However, for the intervals 2 and 3, although the field observations (such as extensive lateral continuity of individual beds and sharp contact between different lithologies) and some of the sedimentological parameters such as existence of the microfossils with similar preservation quality, suggest the primary rhythm as a major mechanism, the geochemical data do not strongly support this conclusion.
- انتشار مقاله: 17-02-1397
- نویسندگان: Zahra Hosseini Asgarabadi,Saeed Khodabakhsh,Hassan Mohseni,Nasrollah Abbassi,Galen Halverson,Thi Hao Bui
- مشاهده
- جایگاه : پژوهشی
- مجله: Rostaniha
- نوع مقاله: Journal Article
- کلمات کلیدی: Factor analysis,Cluster analysis,Hybrid,morphologic characters,Wild roses
- چکیده:
جنس رز در ایران بسیار متنوع است و هیبریدهای طبیعی آن شناسایی شدهاند اما تا کنون هیچ رقمی از آن در کشور تولید نشده است. به منظور استفاده بهینه از منابع ژنتیکی در کشور و ایجاد ارقام با صفات مطلوب، تشخیص روابط گونهها و شناسایی هر گونه تنوع در میان گونههای مختلف بخش Caninae جنس مذکور، ابتدا جمعآوری و مطالعه 45 جمعیت از هفت گونه متعلق به این جنس در 13 استان ایران انجام گرفت. به منظور گروهبندی جمعیتها از روش آماری WARD استفاده شد و نمودار رستهبندی آنها براساس متغیرترین فاکتورها برای تمامی گونهها و بخشها ترسیم شد. آنالیز خوشهبندی صفات کمی و کیفی نشان داد، تفاوت معنیداری بین خصوصیات مورد مطالعه وجود دارد. نتایج خوشهبندی گونههای بخش Caninae طبقهبندیهای قبلی را تایید کرد. همچنین، نتایج آنالیز فاکتور جمعیتهای R. elymaticaنشان داد که وجود مو روی دمگل، فرم کاسبرگ، طول هیپانتیوم، قاعده و فرم دمبرگ بیشترین ارتباط را با یکدیگر نشان میدهند. دو گروه اصلی در R. boissieri به دلیل اختلاف شرایط اکولوژیک بین جمعیتها مشخص شده است. آنالیز خوشهای دو گروه اصلی را در جمعیتهای جنسR. orientalis نشان داد. برخی از صفات کمی و کیفی توانست جمیتهای مختلف گونه R. canina را از هم جدا کند، اما برخی مناطق مانند پلور، کرند و سیاه بیشه بیشترین تنوع را برای ایجاد هیبریدهای بینگونهای نشان دادند. در نهایت، نتایج بررسی گونههای بخش Caninae نشان داد کهR. canina و R. pulverulentaبیشترین تنوع را داشتند که این مسئله میتواند به دلیل ساختار کروموزومی ویژه در Caninae باشد.- چکیده انگلیسی: The genus Rosa has a wide variety in Iran and although some natural hybrids have been found in different regions of the country, but no cultivars have been established so far. In order to optimize use of genetic resources in the country and to create varieties with desirable traits, inter-species relationships and identification of diversity, 45 populations from seven species in section Caninae collected from 13 provinces of Iran, were studied. To group the species, 61 qualitative and quantitative characters using the most suitable method of cluster analysis (WARD) were used and their ordination diagram based on the most variable factors for each species and sections were drown. Cluster analysis of quantitative and qualitative characters showed significant differences between characters. The results of classification confirmed previous taxonomy grouping. Factor analysis of R. elymatica populations showed that the hair on pedicels, sepal form, hip length, prickle base and prickle form possessed the highest correlation. Two main groups were formed in R. boissieri based on ecological difference between them.Cluster analysis of R. orientalis also showed two main groups. Moreover, the results indicated that some populations of R. canina such as Polour, Karand, and Siahbishe (Iran), that showed the most variations in qualitative and quantitative characters, could be used to produce interspecific hybrids.Overall, the results of this study revealed that, R. canina and R. pulverulenta showed the highest variety in thesection Caninae that is due to the combination of some unusual features in section.
- انتشار مقاله: 07-12-1397
- نویسندگان: Parisa Koobaz,Zahra Sadat Hosseini,Mahboobeh Khatamsaz,Maryam Jafarkhani Kermani
- مشاهده
- جایگاه : پژوهشی
- مجله: Rostaniha
- نوع مقاله: Journal Article
- کلمات کلیدی: Factor analysis,Cluster analysis,Hybrid,morphologic characters,Wild roses
- چکیده:
جنس رز در ایران بسیار متنوع است و هیبریدهای طبیعی آن شناسایی شدهاند اما تا کنون هیچ رقمی از آن در کشور تولید نشده است. به منظور استفاده بهینه از منابع ژنتیکی در کشور و ایجاد ارقام با صفات مطلوب، تشخیص روابط گونهها و شناسایی هر گونه تنوع در میان گونههای مختلف بخش Caninae جنس مذکور، ابتدا جمعآوری و مطالعه 45 جمعیت از هفت گونه متعلق به این جنس در 13 استان ایران انجام گرفت. به منظور گروهبندی جمعیتها از روش آماری WARD استفاده شد و نمودار رستهبندی آنها براساس متغیرترین فاکتورها برای تمامی گونهها و بخشها ترسیم شد. آنالیز خوشهبندی صفات کمی و کیفی نشان داد، تفاوت معنیداری بین خصوصیات مورد مطالعه وجود دارد. نتایج خوشهبندی گونههای بخش Caninae طبقهبندیهای قبلی را تایید کرد. همچنین، نتایج آنالیز فاکتور جمعیتهای R. elymaticaنشان داد که وجود مو روی دمگل، فرم کاسبرگ، طول هیپانتیوم، قاعده و فرم دمبرگ بیشترین ارتباط را با یکدیگر نشان میدهند. دو گروه اصلی در R. boissieri به دلیل اختلاف شرایط اکولوژیک بین جمعیتها مشخص شده است. آنالیز خوشهای دو گروه اصلی را در جمعیتهای جنسR. orientalis نشان داد. برخی از صفات کمی و کیفی توانست جمیتهای مختلف گونه R. canina را از هم جدا کند، اما برخی مناطق مانند پلور، کرند و سیاه بیشه بیشترین تنوع را برای ایجاد هیبریدهای بینگونهای نشان دادند. در نهایت، نتایج بررسی گونههای بخش Caninae نشان داد کهR. canina و R. pulverulentaبیشترین تنوع را داشتند که این مسئله میتواند به دلیل ساختار کروموزومی ویژه در Caninae باشد.- چکیده انگلیسی: The genus Rosa has a wide variety in Iran and although some natural hybrids have been found in different regions of the country, but no cultivars have been established so far. In order to optimize use of genetic resources in the country and to create varieties with desirable traits, inter-species relationships and identification of diversity, 45 populations from seven species in section Caninae collected from 13 provinces of Iran, were studied. To group the species, 61 qualitative and quantitative characters using the most suitable method of cluster analysis (WARD) were used and their ordination diagram based on the most variable factors for each species and sections were drown. Cluster analysis of quantitative and qualitative characters showed significant differences between characters. The results of classification confirmed previous taxonomy grouping. Factor analysis of R. elymatica populations showed that the hair on pedicels, sepal form, hip length, prickle base and prickle form possessed the highest correlation. Two main groups were formed in R. boissieri based on ecological difference between them.Cluster analysis of R. orientalis also showed two main groups. Moreover, the results indicated that some populations of R. canina such as Polour, Karand, and Siahbishe (Iran), that showed the most variations in qualitative and quantitative characters, could be used to produce interspecific hybrids.Overall, the results of this study revealed that, R. canina and R. pulverulenta showed the highest variety in thesection Caninae that is due to the combination of some unusual features in section.
- انتشار مقاله: 07-12-1397
- نویسندگان: Parisa Koobaz,Zahra Sadat Hosseini,Mahboobeh Khatamsaz,Maryam Jafarkhani Kermani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Teaching Language Skills
- نوع مقاله: Journal Article
- کلمات کلیدی: Sociocultural Theory,beliefs,Indirect corrective feedback,Gradual corrective feedback,Cognitive theory
- چکیده:
- چکیده انگلیسی: Corrective feedback has received significant attention in English language teaching, and its role has been highly substantial. Considering the importance of corrective feedback in EFL classes, this study aimed at finding the effects of indirect and gradual CF on Iranian EFL learners' grammatical development and their beliefs toward CF. Twenty EFL learners, meeting the criterion of being lower-intermediate in their proficiency, participated in this study and were divided randomly into two groups of indirect and gradual CF. An Oxford Placement Test, Aljaafreh and Lantolf's (1994) regulatory scale, error correction test, writing tasks, and Corrective Feedback Belief Scale were used as data collection instruments. The indirect group received indirect CF based on cognitive theory and the gradual group received feedback based on Aljaafreh and Lantolf's (1994) regulatory scale for four sessions. The findings obtained from Mann-Whitney U tests revealed that the gradual group which received CF based on sociocultural theory was better able to overcome the problems related to simple present and present progressive tenses than the indirect group which received indirect CF based on cognitive theory. The findings also indicated that all learners, both gradual and indirect, preferred receiving CF and both groups always preferred to be corrected and likewise, both groups considered the teacher as the main provider of CF. The results of this study suggest that gradual feedback based on learners’ ZPD was more effective in improving EFL learners’ grammar development. In conclusion, these findings support the idea that social interaction is a prerequisite for cognitive development.
- انتشار مقاله: 24-08-1398
- نویسندگان: Mahmood Dehqan,Zahra Hosseini Bay
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optoelectronical Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanoparticles,Temperature,Optical Absorption Cross Section
- چکیده:
- چکیده انگلیسی: In this paper, the temperature dependence on optical absorption cross section of the core shell bimetallic nanoparticles (NPs) is investigated in quasi static approximation. Temperature dependence of the plasmon resonance is important issue because of recent applications of NPs of noble metal for heat treating of cancer and the computer chips. The effect of temperature on surface plasmon resonance and spectral properties of spherical core-shell NPs are studied by using the Drude Lorentz model. As temperatures increases, the spectrum can be expanded, and thus it causes to expand plasmon resonance absorption and a weak red shift in core-shell NPs. In addition, the temperature dependent absorption cross section of the material depends on the type, structure and geometry of the NPs. The high sensitivity of surface plasmon resonance peaks causes that core shell NPs be completely suitable for medical and optical biosensor applications.
- انتشار مقاله: 22-06-1395
- نویسندگان: Seyyedeh Zahra Hosseini Minabi,Alireza Keshavarz,Abdolrasoul Gharaati
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Net Present Value,meta-heuristic algorithm,resource constraint,preemptive,Multi-objective Project Scheduling
- چکیده:
- چکیده انگلیسی: The aim of a multi-mode resource-constrained project scheduling problem (MRCPSP) is to assign resource(s) with the restricted capacity to an execution mode of activities by considering relationship constraints, to achieve pre-determined objective(s). These goals vary with managers or decision makers of any organization who should determine suitable objective(s) considering organization strategies. We also introduce the preemptive extension of the problem which allows activity splitting. In this paper the preemption multi-mode resource-constrained project scheduling problem (P-MMRCPSP) with Minimum makespan and the maximization of net present value (NPV) has been considered. Since the considered model is NP-Hard, The performance of our proposed model is evaluated by comparison with two well-known algorithms; non-dominated sorting genetic algorithm (NSGA II), multi-objective imperialist competitive algorithm (MOICA). These metaheuristics have been compared on the basis of a computational experiment performed on a set of instances obtained from standard test problems constructed by the ProGen project generator, where, additionally, cash flows were generated randomly with the uniform distribution. Since the effectiveness of most meta-heuristic algorithms significantly depends on choosing the proper parameters. A Taguchi experimental design method (DOE) was applied to set and estimate the proper values of GAs parameters for improving their performances. The computational results show that the proposed MOICA outperforms the NSGA-II.
- انتشار مقاله: 04-02-1394
- نویسندگان: Javad Hasanpour,Mohammad Ghodoosi,Zahra Sadat Hosseini
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optimization in Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Net Present Value,meta-heuristic algorithm,resource constraint,Preemption,Multi-objective Project Scheduling
- چکیده:
- چکیده انگلیسی: In this paper, a novel mathematical model for a preemption multi-mode multi-objective resource-constrained project scheduling problem with distinct due dates and positive and negative cash flows is presented. Although optimization of bi-objective problems with due dates is an essential feature of real projects, little effort has been made in studying the P-MMRCPSP while due dates are included in the activities. This paper tries to bridge this gap by studying tardiness MMRCPSP, in which the objective is to minimize total weighted tardiness and to maximize the net present value (NPV). In order to solve the given problem, we introduced a Non-dominated Ranking Genetic Algorithm (NRGA) and Non-Dominated Sort Genetic Algorithm (NSGA-II). Since the effectiveness of most meta-heuristic algorithms significantly depends on choosing the proper parameters. A Taguchi experimental design method was applied to set and estimate the proper values of GAs parameters for improving their performances. To prove the efficiency of our proposed meta-heuristic algorithms, a number of test problems taken from the project scheduling problem library (PSPLIB) were solved. The computational results show that the proposed NSGA-II outperforms the NRGA.
- انتشار مقاله: 14-05-1392
- نویسندگان: Zahra Sadat Hosseini,Javad Hassan Pour,Emad Roghanian
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Rehabilitation Sciences and Research
- نوع مقاله: Journal Article
- کلمات کلیدی: risk factors,Prevalence,Teaching,Faculty,Voice disorders
- چکیده:
- چکیده انگلیسی: Voice disorder is a multifactorial impairment. Several studies have shown that there is a direct relationship between voice problems and voice-related jobs. Therefore, professional voice users, including teachers, are at high risk of voice disorders, which threatens the employment positions. Also, the investigation of voice impairments among faculty members seems essential. The purpose of this study is to assess the prevalence of voice disorders in faculty members, its impact on the physical, emotional, and functional status of this job group, with and without voice disorders, and the correlation of voice disorders with some risk factors.
Methods
The participants of this study were 114 university teaching faculty members of Mashhad University of Medical Sciences, with a mean age of 43.95±0.98 years. The current cross-sectional descriptive-analytical study used a demographic questionnaire and Voice Handicap Index (VHI) as the data collection instruments. In the present study, based on VHI test results, participants with a total VHI score greater than 14.5 are considered to have voice disorders.
Results
The prevalence of voice disorders among university teaching faculty members was 27.19%. There was a significant correlation between allergy and voice disorders (P= 0.04). Significant differences were also found between the two study groups in terms of the total score of the VHI and its subscales (P <0.001).
Conclusions
Considering the 27.19% prevalence of voice disorders among university teaching faculty members and its effect on the total VHI score, our results confirm that education, prevention, and treatment programs are critical to lessen the frequency of voice disorders related to teaching. However, it has been found that this job group with voice disorders is four times more likely to have allergies than those without voice disorder, which indicates the importance of controlling this problem.- انتشار مقاله: 22-06-1399
- نویسندگان: Zahra Ghayoumi-Anaraki,Hamid Heidarian-Miri,Shahryar Zainaee,Shima Rahmani,Fatemeh Haresabadi,Mahsa Effati,Seyede-Zahra Hosseini
- مشاهده