IMPLANT MATERIAL SELECTION USING EXPERT SYSTEM Ristić, Miloš; Manić, Miodrag; Mišić, Dragan ...
Facta Universitatis. Series: Mechanical Engineering,
04/2017, Letnik:
15, Številka:
1
Journal Article
Odprti dostop
Most certainly, in the field of medicine there is a great contribution of new techniques and technologies, which is reflected in an entire system of health care services. Customized implants are both ...fully geometrically and topologically adjusted so as to meet the needs of individual patients, thus making each implant unique. Their production requires joint efforts of a multidisciplinary team of different profile experts who combine their knowledge in the Implant knowledge model. Thus, we develop an expert system which should help or replace humans in the process of Implant material selection. This paper gives an overview of the expert system concept for the given problem. Its task is to carry out a selection of biomaterial (or class of material) for a customized implant. The model significantly improves the efficiency of preoperative planning in orthopaedics.
Gear drive units are important components of technical systems (TS) and need to be of high quality. Planetary gear units are very compact and efficient mechanical power transformers, but further ...increase of operating quality level requires the application and development of the new design methodology. The subject of this contribution is presentation of Reliability for design as the new approach of reliability modelling suitable for the new design methodology application, especially for planetary gear units using various kinds of experimental and exploitation data. The methodology follows V-model for TS design which is in this work adapted for gear units design and for presentation of the new methodology based on property based design, axiomatic design and robust design methodology. To this end, the procedure for total reliability of TS decomposition, and methodology for elementary reliability for design of structure components calculation is developed and presented. The reliability for design is established in reverse form of reliability for maintenance which presents common perception of the “reliability” term. This approach is intended to provide further increase of planetary gear unit’s quality and efficient usability of gear unit component resources. The design directions are oriented to providing equal level of elementary reliability of components.
This study explores the ethical perceptions of participants in the financial reporting process in order to comprehend the attitudes and evaluation of the acceptability of different approaches to ...earning manipulations. The paper presents different scenarios for income smoothing, earnings management and big bath. The scenarios include various motives and methods for earning manipulations. The study was carried out on 105 students, 58 in the role of creators of financial reports and 47 in the role of users of financial statements. The results show that there are significant differences in ethical acceptability of various scenarios for earning manipulations, as well as in various methods and motives of manipulation. On the other hand, research has not demonstrated the existence of significant differences in ethical perceptions between the creators and users of financial statements.
The aim of this study was to compare the different diagnostic approaches in detection of gastroesophageal reflux disease in children presented with symptoms suggesting gastroesophageal reflux ...disease.
The study design was cross sectional. The study retrospectively included all children who underwent combined multiple intraluminal impedance and pH (pH-MII) monitoring due to gastrointestinal and/or extraesophageal symptoms suggesting gastroesophageal reflux disease at University Children's Hospital in Belgrade, from July 2012 to July 2016.
A total of 218 (117 boys/101 girls), mean age 6.7 years (range 0.06-18.0 years), met the inclusion criteria. Gastroesophageal reflux disease was found in 128 of 218 children (57.4%) by pH-MII and in 76 (34.1%) children by pH metry alone. Using pH-MII monitoring as gold standard, sensitivity of pH-metry was lowest in infants (22.9%), with tendency to increase in older age groups (reaching 76.4% in children ≥ 9 years). The sensitivity of pH-metry alone in children with extraesophageal symptoms was 38.1%, while the sensitivity of pH-metry in children with gastrointestinal symptoms was 63.8%. Reflux esophagitis was identified in 31 (26.1%) of 119 children who underwent endoscopy. Logistic regression analysis showed that best predictors of endoscopic reflux esophagitis are the longest acid episode (OR = 1.52, p<0.05) and DeMeester reflux composite score (OR = 3.31, p<0.05). The significant cutoff values included DeMeester reflux composite score ≥ 29 (AUC 0.786, CI 0.695-0.877, p<0.01) and duration of longest acid reflux ≥ 18 minutes (AUC 0.784, CI 0.692-0.875, p<0.01).
The results of our study suggested that compared with pH-metry alone, pH-MII had significantly higher detection rate of gastroesophageal reflux disease, especially in infants. Our findings also showed that pH-MII parameters correlated significantly with the endoscopically confirmed erosive esophagitis.
Research of uvological characteristics is one of the obligatory steps for
determination of general production and technological value of grapevine
varieties. Such research is particularly recommended ...for local varieties
that did not previously show sat?isfying characteristics necessary for
production of high-quality wine. Local grapevine varieties Smederevka (white
wine variety) and Zametovka (red wine variety) have mostly served for
production of low-quality wine in the past. With changes in the manner of
pro?duction in the sense of focus on high-quality wine and production of
wine with geograph?ical indications, vineyards planted with these varieties
in Serbia have mostly been grubbed up. However, due to the characteristic
and favourable terroir conditions, they have survived in the Trstenik
wine-growing district (subregion within the Tri Morave wine-growing
re?gion). With the aim of determining uvological characteristics of these
two varieties in current climate conditions that are favourable for these
high-yield varieties, this paper examines the mechanical composition of
grape bunches (bunch weight, number of berries, stem weight), mechanical
composition of berries (weight of 100 berries, weight of skin of 100
berries, weight of mesocarp of 100 berries and weight of seeds of 100
berries), as well as grape must characteristics (sugar content and total
acids in grape must) of representative genotypes of local varieties
Smederevka and Zametovka in production vineyards in the Trstenik
wine-growing district. Research results have shown that uvological
characteristics of these varieties are slightly better in comparison with
previous research carried out in other wine-growing areas, that is, in
comparison with general information from literature, which indicates the
necessity for further research of these varieties in different
agro-eco?logical conditions.
The autochthonous, i.e. local, red wine variety Prokupac is one of the most important varieties in Serbia. In the past, this variety was the leading one in the largest number of wine-growing areas of ...our country. The Prokupac variety is currently the most represented in the Tri Morave wine-growing region (Central Serbia), while the largest number of vineyards with this variety are located in the Zupa wine-growing subregion. Due to its importance as an old and traditional variety, certain researches of this variety have been initiated in recent years in wine-growing areas where Prokupac is traditionally grown. Certain scientific activities were initiated to isolate different genotypes with improved production and use value, all with the aim of clonal selection of this variety. In this paper, some characteristics and quality parameters of the more promising Prokupac genotypes that were isolated in the Zupa wine-growing subregion in the Aleksandrovac municipality are presented. More extensive research was carried out on grapes from the harvest of 2019, 2020 and 2021 with 16 selected genotypes, namely eight genotypes from the Latkovac locality and eight genotypes from the Drenca locality. In addition to laboratory analyses of sugar, acid and pH content in the grape must, the theoretical alcohol content was also calculated. Furthermore, spectrophotometric methods were used to determine colour intensity A-420, colour intensity A-520, colour intensity A-620 and total colour intensity, as well as colour tonality. The analyses showed that certain main quality parameters from the research are within the value limits as in earlier research, but that the acid content is generally more optimal for red wine varieties compared to the research of that parameter carried out in the earlier period in other wine-growing areas (Fruska Gora and Cegar wine-growing subregions). Moreover, in our research, the sugar content of the grape is higher than the established values of that parameter in the grape must from the Cegar wine-growing subregion.
In the context of evaluating physical function in individuals with stroke, the 3-Meter Backward Walk Test (3MBWT) emerges as a potential tool of interest. The purpose of this study was to assess the ...test-retest reliability and concurrent validity of the 3MBWT and its correlation with falling incidents. Conducted in a neurological rehabilitation center, 35 ambulatory individuals with stroke were enrolled within a month post-stroke onset. These participants, with a Functional Ambulation Category score of ≥4, underwent the 3MBWT, Functional Gait Assessment (FGA), 10-Meter Walk Test (10MWT), and 6-Minute Walk Test (6MWT) under the supervision of different physiotherapists. The results indicate that the 3MBWT demonstrated high reliability, with an Intraclass Correlation Coefficient of 0.97 (95% CI: 0.95, 0.98). It also showed significant concurrent validity with other established walking tests like the 6MWT (r = -0.78) and 10MWT (r = 0.71), with a moderate correlation with the FGA (r = -0.54). No marked differences in test outcomes were observed between participants based on their fall history. Conclusively, the 3MBWT proves to be highly reliable and agrees well with existing walking function assessments for stroke patients, suggesting its potential as a time-efficient alternative.