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Issue Info: 
  • Year: 

    1393
  • Volume: 

    8
Measures: 
  • Views: 

    583
  • Downloads: 

    0
Keywords: 
Abstract: 

با این که مفهوم بهره وری همیشه مورد بحث بوده، اما اغلب در آن ابهام وجود داشته و درک آن مشکل بوده است. در عمل، این همان فقدان دانشی است که نتیجه نادیده گرفته شدن نفوذ بهره وری در فرآیندهای تولیدی توسط برخی می باشد. هدف از این مقاله بحث در مورد معنی اصلی بهره وری و همچنین ارتباط آن با واژه های مشابه دیگر است که می تواند در مباحث تعاون نیز بکار برده شود. یافته ها نتیجه بررسی بهره وری بر اساس ادبیات دهه گذشته می باشد. مقاله توضیح می دهد که چگونه محققان ابهام مفهوم بهره وری را توضیح داده و یک واژه شناسی جدید برای آن ارائه می نمایند.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1386
  • Volume: 

    14
Measures: 
  • Views: 

    927
  • Downloads: 

    0
Abstract: 

تحقیقات انجام شده نشان می دهد که مورفولوژی استخوان بستگی به بارهای مکانیکی وارد به آن دارد، فرآیندی که این وابستگی را کنترل می کند «نوسازی» نامیده می شود. با توجه به پیروی استخوان از اصول بهینه سازی، در این مقاله از روش بهینه سازی ساختاری LEVEL Set برای مدلسازی همزمان فرآیند های نوسازی داخلی و خارجی استخوان پروکسیمال فمور استفاده شده است. همچنین برای بررسی اثر وجود تخلخل و در نتیجه دانسیته ظاهری متغیر در شکل استخوان اسفنجی مدلساری ها در دو مرحله، مرحله اول با فرض دانسیته ثابت و مرحله دوم با فرض دانسیته متغیر برای استخوان، انجام شده است که نتایج حاصله نشاندهنده یکسان بودن تقریبی هندسه خارجی استخوان و تفاوت قابل ملاحظه ای در هندسه داخلی و وزن آن در دو مرحله مدلسازی است. در نهایت برای اثبات درستی روش، نتایج حاصله با نتایج تجربی حاصل از تصویربرداری اشعه ایکس و برخی از مقالات ارایه شده در این زمینه مقایسه شده است.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2022
  • Volume: 

    53
  • Issue: 

    4
  • Pages: 

    273-285
Measures: 
  • Citations: 

    0
  • Views: 

    118
  • Downloads: 

    16
Abstract: 

This study was performed to evaluate the effect of adding a mixture of peppermint, thyme and rosemary essential oils (EOs) in a ratio of (3:1:2), respectively, to the diet, on growth PERFORMANCE, rumen and blood parameters of fattening lambs. Twenty-one Mehraban lambs with an average weight of 29.80 kg were randomly allocated to one of three diets: 1) control, 2) base diet+1.25ml of EOs and 3) base diet+2.5ml of EOs. Daily weight gain was greater in the groups receiving the EOs than in the control, although this increase was mainly due to the interactions of treatment over time. Feed consumption and feed conversion ratio compared to the control did not altered. The total concentrations of VFAs and acetate in the groups receiving EOs decreased (P<0.05), while the concentration of propionate increased (P<0.05) at the LEVEL of 2.5ml of EOs and isovalerate increased (P<0.05) in both LEVELs of EOs compared to the control. Total population of protozoa, rumen pH and ammonia nitrogen concentration were not affected by treatments. Glucose concentration increased at high LEVEL of EOs (P<0.05). Concentrations of urea, cholesterol, triglycerides, creatinine, total protein and albumin did not altered. The number of red blood cells, hemoglobin, hematocrit, number and percentage of white cells including lymphocytes and eosinophils were not affected by treatments but the percentage of monocytes decreased (P<0.05) at low LEVEL of the EOs. The results of this experiment showed that the addition of mixture of EOs to the diet did not have a significant effect on PERFORMANCE parameters and immune system of lambs, although it reduced the total concentration of VFA and acetate and increased the concentration of propionate.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    24
  • Issue: 

    3 (68)
  • Pages: 

    156-164
Measures: 
  • Citations: 

    0
  • Views: 

    886
  • Downloads: 

    0
Abstract: 

Background and Aims: Lasers with different characteristics have been used to stimulate orthodontic tooth movement. Considering the contradictory findings in this regard, this study was designed to assess the effect of low LEVEL laser therapy (LLLT) on the rate of orthodontic tooth movement.Materials and Methods: In this randomized clinical trial study, 12 patients (4 boys and 8 girls; average age: 16.9±3.4) with extracted upper first premolars and required canine retraction into extraction site were included. While in both sides canines were retracted by NiTi coil spring, one side was exposed to GaAlAs laser (890 nm). LLLT was done (on the buccal and palatal mucosa by slow movement of probe) at the beginning of the first month. Impression and cast fabrication performed at the beginning of retraction, one and two months later. The amount of retraction on the cast was measured with the aid of a reference plaque fabricated on the rogae using a digital caliper. Data were analyzed using paired sample T-test and one-sample Kolmogorov-Simirnov test.Results: There was no significant difference in the amounts of canine movement between laser exposed and control sides (P>0.05).Conclusion: The energy dose of laser used in this study (72 J per each tooth) was not appropriate for increasing dental movement.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2022
  • Volume: 

    48
  • Issue: 

    1
  • Pages: 

    49-62
Measures: 
  • Citations: 

    0
  • Views: 

    91
  • Downloads: 

    9
Abstract: 

In order to properly understand the subsurface structures, the issue of inversion of geophysical data has received much attention from researchers. Since accurate reconstruction of the shape and boundaries of the mass using gravimetric data is very important in some issues, it is important to use an effective and efficient method that has a high ability to draw and reconstruct the boundaries of a mass. In recent years, the LEVEL set method introduced by Asher and Stein has been widely used to solve this problem. From the expansion of the LEVEL set function in some bases of the problem, the effective number of parameters is greatly reduced and an optimization problem is created which its behavior is better than the least squares problem. As a result, the LEVEL set parameterization method will be presented for the reconstruction of inversion models. A common advantage of the parametric LEVEL set method is the careful examination of the boundary for optimum sensitivities, which significantly reduces the dimensional problem, and many of the difficulties of traditional LEVEL set methods, such as regularization, reconstruction, and basis function. LEVEL set parameterization is performed by radial basis functions (RBF),which causes an optimal problem with an average number of parameters and high flexibility,and the computational and optimization process for Newton's method is more accurate and smooth. The model is described by the zero contour of a LEVEL-set function, which in turn is represented by a relatively small number of radial basis functions. This formulation includes some additional parameters such as the width of the radial basis functions and the smoothness of the Heaviside function. The latter is of particular importance as it controls the sensitivity to changes in the model. In this algorithm adaptively chooses the required smoothness parameter and tests the method on a suite of idealized Earth models. In this evolutionary approach, the reduction gradient method usually requires many iterations for convergence, and the functions are weakened for low-sensitivity problems. Although the use of Quasi-Newton methods to improve the LEVEL set function increases the degree of convergence, they are computationally challenging, and for large problems and relatively finer grids, a system of equations must be solved in each iteration. Moreover, based on the fact that the number of underlying parameters in a parametric approach is usually much less than the number of pixels resulting from the discretization of the LEVEL set function, we make a use of a Newton-type method to solve the underlying optimization problem. In this research, the algorithm is used to investigate its strengths and weaknesses for applying geophysical gravity data, coding and programming, and it is tested using several two-dimensional synthetic models. Finally, the method is tested on gravity data from the Mobrun ore body, north east of Noranda, Quebec, Canada. The results of this study show that the application of the optimization algorithm of the LEVEL set function will lead to a relatively more accurate and realistic detection of mass boundaries. It shows that the tested mass has spread from a depth of 10 meters to a depth of 160 meters.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1390
  • Volume: 

    -
  • Issue: 

    1
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    264
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    23
  • Issue: 

    1 (62)
  • Pages: 

    21-26
Measures: 
  • Citations: 

    0
  • Views: 

    813
  • Downloads: 

    0
Abstract: 

Background and Aims: Lasers with different characteristics have been used to stimulate orthodontic tooth movements and to inhibit the pain during tooth movements. Considering the contradictory finding in this respect, the effect of low LEVEL laser therapy (LLLT) was evaluated on the pain during orthodontic tooth movement.Materials and Methods: In this randomized clinical trial study, 12 patients were included with extracted upper first premolars and required canine retraction into extraction site. While in both sides canines were retracted by Niti coil spring, one side was exposed to GaAlAs laser (890 nm). LLLT was done on the buccal and palatal mucosa by slow movement of probe. The patients were asked about their pain on both sides 2 days after beginning of retraction. Pain measurement was evaluated with VAS.Results: Pain perception in LLLT side was significantly decreased (P=0.007).Conclusion: Based on the results, single irradiation of GaAlAs laser (12 J energy per tooth) can decrease pain perception.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1989
  • Volume: 

    16
  • Issue: 

    -
  • Pages: 

    191-202
Measures: 
  • Citations: 

    1
  • Views: 

    133
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

Motahari Mozhgan | RAFIEI EHSAN | Dehghanian Danoosh | Bourbourshirazi Mahmoudi Mozhdeh

Issue Info: 
  • Year: 

    2022
  • Volume: 

    17
  • Issue: 

    4
  • Pages: 

    358-368
Measures: 
  • Citations: 

    0
  • Views: 

    335
  • Downloads: 

    0
Abstract: 

Introduction: Teeth loss and its consequences, such as mental discomfort, most often negatively affects one's health and well-being. Dental implants were introduced in an attempt to raise patients' satisfaction and improve health and quality of life in all dimensions. Hence, this study was performed to check the impact of implantation on the oral health indices in patients who were candidates for implant treatment in Isfahan city. Materials & Methods: In this analytical cross-sectional study, the lifestyle quality of 73 patients who were referred to Isfahan’, s Islamic Azad Dental University (Khorasgan) and its affiliated private centers, was assessed using the OIDP index before and after their implant treatment between 2019 and 2020. Also, data analysis was done using Independent ttest, Paired t-test and analysis of variance ANOVA test (α,= 0. 05). Results: In the current study, the most common problem and with the most effect on oral satisfaction quality were teeth lost and extractions, respectively. Majorly, the effects were evident on the eating habits (83. 6%), satisfaction of communication with others (68. 5%) and quality of smile (64. 4%). In the questionnaire, an attenuated score of OIDP was recorded, before the implant treatment compared to that of post-treatment, which was statistically meaningful (p value < 0. 05). Conclusion: According to the current study data, we can conclude that implant treatment can have a positive effect on the patients' lifestyle quality.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2024
  • Volume: 

    15
  • Issue: 

    4
  • Pages: 

    253-268
Measures: 
  • Citations: 

    0
  • Views: 

    13
  • Downloads: 

    0
Abstract: 

Background and Aim: Image brightness heterogeneity is one of the major challenges in computer image processing that can lead to inaccurate results in image segmentation. Despite the existence of numerous segmentation methods, few studies have been conducted on the effect of brightness heterogeneity and the selection of the best color channels in segmentation. In this paper, different color spaces have been used for automatic detection of skin lesions. Methods: In this study, the LSE (LEVEL Set Evolution) segmentation method along with intensity smoothing has been used for computer recognition of skin lesions. First, the brightness heterogeneity is reduced and a more uniform image is created. Then, the proposed segmentation divides the image domain into distinct regions. This method results in more accurate recognition of skin lesions. Results: The proposed method has been tested on 200 dermoscopic images from the known PH2 dataset using different color channels. The results show that this method performs better than other methods. Accuracy of 97%, sensitivity of 98%, specificity of 99% and Dice coefficient of 92% have been obtained. Conclusion: This method has the ability to accurately isolate and diagnose lesions and can help doctors in the treatment process of skin lesions.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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