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In this study, the influence of Furfurylation on practical properties of beech plywood investigated. Furfurylation of beech layers were performed by impregnation and heat catalyze up to 30% and 70% weight percent gain. Plywood specimens made by 2 resins (Urea Formaldehyde and Methylene Diphenyl Diisocyanate). Practical properties of furfurylated specimens investigated and compared to untreated specimens. Modulus of rupture (MOR), modulus of elasticity (MOE), shear strength, water absorption and thickness swelling were determined. Results revealed that by increasing the furfurylation level, modulus of elasticity (MOE), water absorption and thickness swelling (dimensional stability) improved. But modulus of rupture (MOR) just increased up to 30% furfurylation and decreased in higher levels of furfurylation. Furfurylation had a negative effect on shear strength of bond line and decreased by increasing the furfurylation level.

The current research aims at studying the conceptual relationship between the science and technology documents through the comparison of vocabularies that are used within the patents and the papers in the field of Autonomous Underwater Vehicles (AUV). The research method is descriptive. To perform the research, the patents were retrieved from Google Patents and Lens websites, and the papers from IEEE Explore database. A hybrid keyword-class method was used to conduct the search. It means that the search query was consisted of "Autonomous Underwater Vehicle" keyword and “H” class. The titles and the abstracts of the patents and the papers were automatically indexed through a semi-automatic method. This resulted in 195 keywords for patents and 114 ones for papers. Co-occurrence matrices of these two sets of keywords were created through RavarMatrix software. The hierarchical maps of keywords were drawn by SPSS. Findings show that 65 percent of papers’ keywords are those that occurred within the patents but 23 percent of patents’ keywords are similar to the papers’. The structural comparison of patents and papers clustering’s also revealed that the structural proximity between patents and papers vocabularies is equal to zero. The other finding showed that the similarity between the members of ego networks of prominent keywords is for two cases zero and for others fewer than 15 percent except for the keyword “data”. It may be concluded that the science is affected by technology in the field of AUV.

The purpose of the present study was to analyze the interdisciplinary relations of “Library Science and Information Science”. For this purpose the subject categories of citing and cited journals of these fields were investigated in JCR database during the period of 1987-1997 and 2003-2013, and through the comparsion of obtained results the impact of information technology on the development of “LIS” interdisciplinarity was investigated. Methedology of the research was co-citation analysis of journals in scientometrics studies. Also the research was performed using the conventional techniques of scientometrics including Bradford law, Ward hierarchical clustering approach in statistical software SPSS, and the new measure including Proximity index. Research community includes citing and cited journals of 56 “LIS” journals during 1987-1997 and 83 journals during 2003-2013 in Journals Ctiation Report (JCR) database. The results showed that “LIS” has been influenced by other subject categories more than affecting them. For example, the number of journals which “LIS” cited from 1758 (in the first period) has increased to 5303 (in the second period). Co-occurrence matrix of core citing and cited subject categories was analyzed, and three main clusters in the first period and seven clusters in the second period were drawn. In general, the amount and quality of co-occurrence of subject categories in clusters showed that the domain and variety of affecting and affected subject categories were expanded in the second period. Structural similarity of clusters for affecting and affected subject categories calculated. Results showed that structural similarity of clusters in the second period was %10 higher than in the first period. Also, the Structural similarity of affecting clusters of “LIS” was more than affected clusters. Assessment of difference between subject categories groups by ANOVA and Tukey Post hoc tests showed that there were differences between all numbers of citing and cited groups.

Introduction: Today, scientific collaboration has a rising trend in scientific journals. Therefore, the aim of ‎the current study was to analyze the co-authorship network among authors of the Journal of ‎Health Information Management (JHIM).‎ Methods: The present applied and descriptive study was conducted through social networks analysis ‎approach. In the present study, 568 articles published in the JHIM from 2006 to 2014 were ‎studied. The data were analyzed using UciNet software and SPSS software. Results: The findings revealed that a large amount of the articles were the results of the collaboration ‎of three main authors. In addition, 25% ‎of the authors were the most influential individuals in ‎producing journal papers. These authors mostly collaborated with authors of ‎lower rank. The ‎authors were divided into 3 categories of outstanding, active, and non-active.‎ Conclusion: It can be concluded that co-authorship has had a rising trend in the JHIM. As the results ‎revealed, the number of articles with ‎multiple authors has increased. It seems that the ‎increasing of outstanding authors should be one of the policies of this journal.‎

Background: The metabolic syndrome and periodontitis coincide with systemic inflammation and glucose tolerance disorder, which indicate the common pathophysiologic pathway of these diseases. The main goal of this study was to determine the effects of the metabolic syndrome on the periodontal indices of hemodialysis (HD) patient. Materials and Methods: In this descriptive-analytical study, 75 persons were selected by the simple method, 50 of them were HD patients, and 25 of them were healthy people. They were divided into three groups each of which included 25 persons. The periodontal conditions of the selected persons were determined by radiography, gingival index, probing pocket depth, and bleeding index. Then, the periodontal indices of the patients suffering from metabolic syndrome and the persons not affected by metabolic syndrome were compared. At the end, the data were analyzed by SPSS software (version 20) using Mann–Whitney and Kruskal–Wallis tests at the meaningful level of α = 0.05. Since the condition of the unilateral variance test could not be provided for this study, the Kruskal–Wallis test was used. To complete the test, the Mann–Whitney test was used in the binary form among the groups being studied. Results: The obtained results showed a meaningful difference among the groups under study (P < 0.001). The results of the test showed a meaningful difference among the obtained indices of the groups being studied in the binary form (P < 0.001) too. Conclusion: The results of the present study revealed when the severity of chronic systemic disease increased the health of the periodontal tissues would decrease.

The purpose of this paper is to present a fast, economical and practical method for mathematical modeling of aerodynamic characteristics of rectangular wing-in-ground effect (WIG). Reynolds averaged Navier-Stokes (RANS) equations were converted to Bernoulli equation by reasonable assumptions. Also Helmbold's equation was developed for calculation of the slope of wing lift coefficient in ground effect by defining equivalent aspect ratio (ARe). Comparison of present work results against the experimental results has shown good agreement. Finally, according to the calculated aerodynamic coefficients, height static stability of WIG was evaluated by Irodov’s criterion in various ground clearance (h/c). A practical mathematical modeling with lower computational time and higher accuracy was presented for calculating aerodynamic characteristics of rectangular WIG. The relative error between the present work results and the experimental results was less than 8%. Also, the accuracy of the proposed method was checked by comparing with the numerical methods. The comparison showed fairly good accuracy. The evaluation of Irodov’s criterion shows that height static stability (HS) increases with reduction of the height. Aerodynamic surfaces in ground effect were used for reducing wetted surface and increasing speed in high-speed marine and novel aeronautical vehicles. The proposed method is useful for investigation of aerodynamic performance and HS of WIG vehicles and racing boats with aerodynamic surfaces in ground effect. The proposed method has reduced the computational time significantly as compared to numerical simulation that allows conceptual design of WIG craft to do with economical.

Although a relatively new discipline, Knowledge Management (KM) is an area with a wide range of theoretical concepts and practical implications. The applicability of KM in different environments, and the vast value and benefits of its application, have led to great developments within the discipline over the last few years. The interdisciplinary nature of KM has also provided the opportunity for contributions by people from different disciplines, which in turn has lead to the rapid advancement of KM boundaries. This paper aims to examine the subject structure of the KM discipline through keyword analysis of documents in the Web of Science, using a hierarchical clustering approach and an inclusion index. Within the Web of Science categories, according to the findings, the three categories of "Management", "Computer Science Information Systems" and "Information Science Library Science" claim the highest number of documents in this area. Of 5570 author keywords, , 96 keywords are identified as "highly used" keywords. Three hierarchical clusters (dendrograms) are formed from co-occurrence analysis of highly used keywords in the three categories. A comparison of these denrograms indicates that six clusters, including a total of 16 keywords, are common in the three categories. Looking at clusters of the three categories revealed that two categories - Management and Information Science Library Science - have 14 common/shared clusters, and therefore the highest degree of similarities. However, the category of Computer Science Information Systems, with 28 unique clusters, differs most markedly from the other two categories. To investigate the rate of common keywords from one category to another, the inclusion index is calculated. Results of this exercise indicate that the category of Information Science Library Science has the highest number of common keywords.

Purpose: Each language has its own problems. This leads to consider appropriate models for automatic indexing of every language. These models should concern the exhaustificity and specificity of indexing. This paper aims at introduction and evaluation of a model which is suited for Persian automatic indexing. This model suggests to break the text into the particles of candidate terms and to cull the most appropriate ones through a special method of term weighting. Methodology: The introduction method of the automatic indexing model is performed through showing the steps and the possible problems for running them. Evaluation is based on the inclusion index. This index is used for determination the inter-indexer consistency. Therefore, the consistency of resulted index terms (from this model) and author keywords is determined. Findings: Findings show that 90% of articles' most weighted terms are similar to their first author keywords. The overall consistency between the results of running the model and author keywords is 76%. Compared with the prior works, the performance of the model is acceptable. Originality/Value: The initial value of this paper is concerning the automatic indexing with regard of Persian language problems. The model is well suited for using regular expression language which is supported by many programming languages. This diminishes the need to create database tables for text manipulation and processing. In addition, the model solves the problem of upper threshold for determination of final terms. Another algorithm makes it possible to determine the lower one. Finally, the number of culled terms does not depend on the text length. This guaranties the exhaustificity and specificity of indexing.

INTRODUCTION: Due to dynamic of terms, their classification is challenging. The current research aims at determining the usability of a model for automatic recognition of MeSH terms categories through measuring their occurrence frequency within relevant and non-relevant document corpuses from PubMed. METHODs: This is a descriptive research that uses the document analysis method. MeSH and PubMed were used to collect research data. The significancy of these resources confirms their validity. 18164 MeSH-term and 163226 PubMed documents were selected. The both of these amounts are greater than what Cocran function suggests. Eleven document corpuses were retrieved from PubMed. The relative ocurrence frequencies of MeSH terms within each corpus were determined. The results were compared with the real category of MeSH. In additions, the categories of 1 percent of MeSH terms were determined by experts in medical domains. The frequency distribution method was used for statistical description of data. Data were also analyzed through T and Chi-Squar tests in SPSS. RESULTS: Each document of PubMed on average belongs to three MeSH categoris and most of Mesh terms occurred in all corpuses. The results confirm that the suggested method increases the probability of MeSH category recognition. The performance of the method depends on the subject category of MeSH Term and ranges between 3 to 67 percent. The findings also show that the medical expertises determination on the subject category of MeSH Terms is compatible with the real categories of MeSH tree. CONCLUSION: The compatibility of the subjective and objective methods for the subject category recognition depends on the knowledge area. The subjective categorization is a quite cognitive task and roots in human environmental experiences. This is why the machine depended models are not able to simulate that process.

Citing national publications is considered as a qualitative measure for science localization in the current research. Consequently, the aim is to study this metric within the corpus of Iranian Scholar Journals in Social Science Domain between 2002 and 2010. Methodology: The research uses the citation analysis method. The references of six social science scholar journals were extracted from the papers and they were then divided into two groups of national and foreign publications. The studied journals were those which were regularly published in Iran between 2002 and 2010. The analysis performed on a sample of 543 papers out of 1528 ones. The sampling method was based on the Cochran’s function. Findings: An ANOVA test showed that the average number of citing to the national publications is statistically unchanged in the journal’s papers during the period mentioned above. On the other hand, the same average for foreign publications is growing. The correlation analysis determined that this growth follows a logarithmic function. The other finding concerns the differences between the average numbers of citing to the national publications in the studied journals. A one way ANOVA test revealed a difference between the journals from this point of view. Based on the Tukey’s Range Test the results of ANOVA test is affected by the "Journal of Women Strategic Studies". It means, if this journal were omitted from the analysis, the rest five ones would statistically have the same rate of citing to the national publications. The citing rate to national publications ranges between 0.31 and 0.39 except for the Journal mentioned above. Conclusion: Based on this metric, the tendency toward the use of national publications in the social science domain is constant despite the number of scientific productions is growing in Iran. This means that the Iranian social science domain not only doesn’t tend to the science localization but its use of foreign science is growing in the span of time as well.

Purpose: The aim of this research is to study the relationship between the co-authorship and the impact factor in Persian technical and engineering journals of Iran during the years 2001-2010. Method: The research method is analytic-descriptive with a citation analysis approach. The research population consists of 9321 papers from 77 Persian technical and engineering journals of Iran during the years 2001-2010. The data analysis was performed through Excel® and SPSS® v.20 programs. They were analyzed by statistics methods like, ANOVA, Chi Square, and Regression analysis. Findings: Findings showed that the average number of authors for Persian technical and engineering journals’ papers of Iran was not experienced a considerable change in the period mentioned above. The co-authorship was a dominant status in the papers that were studied but the average number of authors was slowly increases during the years of study. The findings also showed that a relationship is occurring between the co-authorship and Journal Impact Factor from 2010. Conclusions: The findings suggested that the co-authorship trend was unchanged during the studied period and the trend towards writing articles with two or three authors has been more significant. Occurring a significant relationship between the number of authors and the Impact Factor at the end of the studied period gives a positive outlook for the role of co-authorship in receiving more citations in future. As a final conclusion, the role of the number of authors in rising the chance for receiving more citations has been 17 percent among the other factors in Iranian technical and engineering journals.

Purpose: The current research focuses on selective dissemination of news and aims at finding patterns for recognition of readers’ favorite news through web mining technique. Method: Data for this research was collected from the Yahoo News Website. The source of news was Associated Press. 840 news dated between 2011/3/1 and 2011/5/10 was analyzed through subject clustering technique. Findings: Results show that 18% of news were visited over the average visit rate. Based on 80/20 rule, it is probable that 80% of readers interested in outstanding news. The other finding shows the gender as an influencing variable on individuals’ news interest. About 70% of readers were located in USA. This percentage should be more for non-English news websites. About 21% of readers were considered as active ones. This follows the 80/20 rule too. Based on another finding, the news in the same clusters receive the same number of comments from readers. This shows that the other news in the same cluster can be disseminated to the readers of a news. Finally, the use of cross sell pattern is appropriate for selective dissemination of news. Originality/Value: The reader’s comments under the news can be considered as an appropriate source for selection and dissemination of news. The current research offers patterns for selective dissemination of news through analysis of readers’ comments written under the news.

Background: Different methods have been suggested to preserve bone architecture following traumatic events such as teeth extraction. The purpose of the study was to histologically and histomorphometrically evaluate the dental socket healing after applying porous titanium granules (PTG) in dogs. Materials and Methods: Four healthy male dogs were involved in the present 6-weeks experimental animal study. Three sockets were surgically created in each side of dog′s mandible. One of the sockets in one side was randomly filled by PTG and covered by a resorbable membrane (Tigran + membrane group). Another socket was left unfilled and just covered by the same membrane (membrane group) and the last one was left unfilled and uncovered as the control group. The dogs were killed at two time intervals (2 weeks and 6 weeks, two dogs at each time point). All samples were histologically evaluated under an optical microscope for a new bone formation. Data were analyzed by SPSS ver. 16 and Kruskal-Wallis and Mann-Whitney tests were used to compare data in different groups (α = 0.05). Results: There was a significant difference between the Tigran + membrane and the control group in 2 and 6 weeks in the mean amount of total regenerated bone (P < 0.05). The mean amounts of woven, lamellar, and total regenerated bone showed significant differences between 2 weeks and 6 weeks for all three groups (P < 0.05). Conclusions: It can be assumed that the use of Tigran bone substitute with membrane can promote the bone regeneration in bone defects.

Background: The greater surface of bioactive glass nanoparticles presents an incomparable and promising feature similar to the biological apatite. Nanoparticles improve cellular adhesion, enhance osteoblast proliferation and differentiation, and increase biomineralization for periodontal regeneration and dental implants. Considering the fact that interaction between periodontal cells and bone graft materials are important for periodontal lesion regeneration, the present study was undertaken to investigate the genotoxicity of a novel synthesized nanoscale bioactive glass and compared it with Novabone bioglass in periodontal fibroblasts cells, in order to approve the biocompatibility of nano bioactive glass. Materials and Methods: In this in vitro experimental study, periodontal C165 fibroblasts cells were cultured in their logarithmic phase and the genotoxicity of novel synthesized bioactive glass nanoparticles and Novabone bioglass was studied in different concentrations and a control group using Comet assay test. By using Autocomet software, three parameters (Tail length, %DNA in tail, Tail moment) were analyzed; the genotoxicity of mentioned biomaterials and control group. Obtained data were analyzed by SPSS 11.5 software, Kruskal Wallis H and Mann Whitney tests (P = 0.05). Results: No statistically significant difference was observed between the concentrations of Novabone bioglass (P value = 0.085) with control group and novel nano bioactive glass (P value = 0.437) with control group in the evaluation of %DNA in tail parameter. There was significant difference between genotoxicity of novel nano bioactive glass and control, and between Novabone bioglass and control group in concentrations of 4 and 5 mg/ml. According to significance of the mean difference, novel nano bioactive glass showed higher genotoxicity compared to Novabone bioglass in the concentration of 5 mg/ml (P ≤ 0.05). Conclusion: The findings of this study have demonstrated that novel nano bioactive glass had no genotoxicity in concentrations lower than 4 mg/ml. Nanoparticles have a higher surface area in comparison to microparticles and thus, the amount and rate of ion release for nanoparticles are extremely higher. This difference is the main reason for the different genotoxicity of nano bioactive glass and micro Novabone bioglass in the concentrations higher than 4 mg/ml.

Introduction: It has been demonstrated that use of plasma rich in growth factors produces a dynamic surface on the implants, which accelerates the healing process. This study undertook a histologic and histomorphometric evaluation of the effect of platelet-rich growth factors (PRGF) on the amount of bone regeneration around dental implants.Materials and Methods: In this animal-intervention study, two systemically healthy Persian mix-breed dogs were selected. Three months after extraction of the dogs’ mandibular premolars on both sides, 12 implants were selected from the OIC system with a length of 10 mm and a diameter of 5 mm. Six implants were placed in the osteotomy cavities using growth factors and 6 others were placed in the osteotomy cavities without PRGF. After 12 weeks, all the implants were removed along with the surrounding bone using Trephine bur. The samples were evaluated under a light microscope subsequent to sectioning. Data were analyzed with t-test and Mann-Whitney test (α = 0.05).Results: The results of the present study indicated that histologically, there was a significant increase in the amount of regenerated bone around the implants; moreover, thickness and maturity of bony trabeculae were not different in the samples containing PRGF in comparison with the control samples.Conclusion: According to the results, implant-bone interface integration rate around dental implants coated with PRGF was higher compared to the control group Key words: Animal study, Dental implants, Growth factor, Histomorphometry, Histology, Plasma.

Introduction: Effective plaque removal is an important factor in the long-term clinical success of dental implants. The aim of this study was to compare the clinical efficacy of a powered toothbrush (Power Cross-Action) and a manual toothbrush (Cross-Action) in the control of plaque and soft tissue inflammation around implants supporting mandibular overdentures.Materials and Methods: This study was a cross-over clinical trial. The subjects included 10 edentulous subjects, aged 47-73 years, with removable mandibular overdentures supported by 2 unsplinted implants; all the subjects wore maxillary complete dentures. The study consisted of two 4-week phases separated by a 2-week interval. In each phase each subject randomly used one toothbrush type. Two days prior to each phase, the implants were polished. Plaque and bleeding indices were recorded before and after brushing. Data was analyzed by t-test using SPSS software (α = 0.05).Results: Both toothbrushes reduced the indices under study. Means of plaque index decreases were 0.5 in manual toothbrush and 0.44 in powered toothbrush. Means of bleeding index decreases were 0.27 in manual toothbrush and 0.3 in powered toothbrush. There were no statistically significant differences between the two toothbrush types in changing plaque index (p value = 0.88) and bleeding index (p value = 0.91).Conclusion: Both toothbrushes were efficient in plaque control around implants which supported mandibular overdentures and there was no difference between them. Patients can use one of these toothbrushes depending on personal preference and comfort. Key words: Dental implants, Hand toothbrush, Mechanical plaque removal, Overdenture, Powered toothbrush.

Background: Decalcified freeze-dried bone allograft (DFDBA) may have the potential to enhance bone formation around dental implants. Our aim in this study was the evaluation and comparison of two types of DFDBA in treatment of dehiscence defects around Euroteknika® implants in dogs. Methods : In this prospective clinical trial animal study, all mandibular premolars of three Iranian dogs were extracted. After 3 months of healing, fifteen SLA type Euroteknika® dental implants (Natea) with 4.1mm diameter and 10mm length were placed in osteotomy sites with dehiscence defects of 5mm length, 4 mm width, and 3mm depth. Guided bone regeneration (GBR) procedures were performed using Cenobone and collagen membrane for six implants, the other six implants received Dembone and collagen membrane and the final three implants received only collagen membrane. All implants were submerged. After 4 months of healing, implants were uncovered and stability (Implant Stability Quotient) of all implants was measured. Then, block biopsies of each implant site were taken and processed for ground sectioning and histomorphometric analysis. The data was analyzed by ANOVA and Pearson tests. P value less than 0.05 was considered to be significant. Results: All implants osseointegrated after 4 months. The mean values of bone to implant contact for histomorphometric measurements of Cenobone, Denobone, and control groups were 77.36 ± 9.96%, 78.91 ± 11.9% and 71.56 ± 5.61% respectively, with no significant differences among the various treatment groups. The correlation of Implant Stability Quotient and histomorphometric techniques was 0.692. Conclusion: In treating of dehiscence defects with GBR technique in this study, adding DFDBA did not significantly enhance the percentages of bone-to-implant contact measurements; and Implant Stability Quotient Resonance Frequency Analysis appeared to be a precise technique.

Background: The differences between marginal gingiva and interdental papilla may be due to variation in the molecular composition of these two different anatomical structures. The aim of this study was to evaluate the staining intensity of fibronectin in human marginal gingiva and interdental papilla. Materials and Methods: In a prospective analytical study, 16 healthy subjects needing crown lengthening surgery were selected. All participants were medically healthy, non-smokers, with no medication intake, and a healthy periodontium. During surgery, facial/buccal marginal gingiva and interdental papilla were separately harvested. The specimens were subjected to hematoxylin and eosin, histochemical (Masson′ strichorom, reticulin, and elastic), and immunohistochemical staining for evaluation of morphology and inflammation; assessment of connective tissue fibers (collagen, reticulin, and elastic); and determination of fibronectin staining intensity. The data were analyzed by Spsssoftware, Wilcoxon, and Spearman tests. P

Introduction: The study on psychology of marriage rooted in the social issues. The field has also found its way to biomedicine. The current research, based on the document-term clustering methods, focus on term-proximity of documents that were related to the field of psychology of marriage in biomedicine literature. Methods: The co-occurrence frequency of terms within the two different corpuses of documents resulted in two proximity matrixes. The corpuses contained sequentially the documents published during the years “1990-99” and 2000-2008”. Those documents were returned by two separate searches in Medline. The cosine method was established to determine the proximity of terms. Besides, the terms were clustered by the Ward’s method. Results: The measurement of term-proximity resulted in two graphs of hierarchical clusters. The comparison revealed that twenty terms up to thirty-eight kept permanently their proximity with one or more other terms during the two periods of study adult and 21(60%) prenatal had a correct sequence. Conclusion: Dividing correspond subjects with psychology of marriage into five areas prepares the opportunity to compare the two hierarchical graphs and find the relationship between and within those areas. Consequently, document-term clustering assists to answer some reference queries. Keywords: Psychology; Marriage; Classifications; Medicine in Literature; Medline; Subject Headings.

چكیده مقدمه: سرعنوان‌های موضوعی پزشکی (MeSH) با بیش از 000 23 سرعنوان، منعکس کننده‌ی موضوعات حوزه‌ی علوم پزشکی است. لذا در این پژوهش با همبستگی بین توسعه‌ی MeSH و افزایش رکوردهای Medline می‌توان چگونگی گسترش آماری موضوعات حوزه‌ی پزشکی را در طول زمان مورد سنجش قرار داد. روش بررسی: در یک پژوهش تحلیلی، حدود یك میلیون ركورد از موضوعات علوم پزشكی و انتشارات نمایه شده در دامنه‌ی Medline به طور تصادفی انتخاب شد. از طریق تعیین همبستگی بین افزایش تعداد مدارک Medline و افزودن سرعنوان‌های جدید به MeSH، به دو سؤال در خصوص گسترش موضوعات پزشکی پاسخ داده شد: 1. موضوعات پزشکی در طول زمان از لحاظ کمّی چگونه در MeSH گسترش یافته ‌است؟ 2. امروزه در ازای تولید و انتشار چند مدرک علمی پزشکی، یک موضوع جدید تولید و به صورت سرعنوان به MeSH افزوده می‌شود؟ یافته‌ها: توسعه‌ی MeSH در طول زمان، به صورت لگاریتمی در سه فاز مختلف صورت گرفته است. با تلفیق این سه فاز در یک فاز واحد، فرمولی برای پیش‌بینی توسعه‌ی MeSH و موضوعات پزشکی در ازای افزایش انتشارات این حوزه به دست آمد. از طرفی روشن گردید که امروزه، به صورت خطی، در ازای انتشار بیش از 250 مدرک در موضوعات گوناگون علوم پزشکی، یک موضوع جدید فراهم و به MeSH افزوده می‌شود. نتیجه‌گیری: نتایج نشان داد که بر خلاف برخی از نظرها، گسترش موضوعات علمی پویاست و این پویایی به صورت خطی است و هرگز متوقف نمی‌شود. واژه‌های كلیدی: Medline؛ سرعنوان‌های موضوعی؛ اصطلاح‌نامه