70 research outputs found
An algorithm for pulsed activation of solenoid valves for variable rate application of agricultural chemicals
An alternative algorithm to Pulse Width Modulation (PWM) for pulsed activation of solenoid valves for applying chemicals through agricultural sprayer nozzles is presented. Solenoid valves attached to individual spray nozzles on a modified EMDEK tractor-mounted sprayer system are activated by electronic pulsation to vary the application rate of agricultural chemicals, varying the output by location according to Geographical Information System (GIS) data and a GPS system. A potential advantage of this alternative algorithm over pulse width modulation based systems is the use of lower-cost industrial solenoid valves with slower opening and closing times instead of the more expensive high speed valves normally used in PWM systems
Modification of a commercial PWM sprayer control system for precision farming application
The control system of a commercial sprayer was modified for variable–rate control of 12 individual solenoid shut off valves spaced 0.5 m apart on a sprayer boom. The variable-rate control system consisted of pulse width modulation (PWM) solenoids, a by pass control valve, and nozzle control system interfaced to a computer. An algorithm was developed to vary application rate across the booms with computing the best possible combinations of pulse width at the optimal boom through the computer control program for nozzles. This algorithm compensates inaccuracy of applying desired application rate due to pressure fluctuations across the booms
TraVaS: Differentially Private Trace Variant Selection for Process Mining
In the area of industrial process mining, privacy-preserving event data
publication is becoming increasingly relevant. Consequently, the trade-off
between high data utility and quantifiable privacy poses new challenges.
State-of-the-art research mainly focuses on differentially private trace
variant construction based on prefix expansion methods. However, these
algorithms face several practical limitations such as high computational
complexity, introducing fake variants, removing frequent variants, and a
bounded variant length. In this paper, we introduce a new approach for direct
differentially private trace variant release which uses anonymized
\textit{partition selection} strategies to overcome the aforementioned
restraints. Experimental results on real-life event data show that our
algorithm outperforms state-of-the-art methods in terms of both plain data
utility and result utility preservation
The relationship between body mass index and preeclampsia: A systematic review and meta-analysis
Background: One of the causes of maternal and fetal mortality and morbidity is pregnancy-induced hypertension, the most common form of which is preeclampsia that causes many complications for mother and fetus.
Objective: The aim of this systematic review and meta-analysis was to determine the relationship between body mass index (BMI) and preeclampsia in Iran.
Materials and Methods: Using valid keywords in the SID database, PubMed, Scopus, data obtained from all the articles, which were reviewed in Iran between 2000 and 2016, were combined using the meta-analysis method (random-effects model) and analyzed using STATA version 11.1.
Results: A total number of 5,946 samples were enrolled in 16 studies with the mean BMI values of 25.13, 27.42, and 26.33 kg /m2 in the healthy, mild, and severe preeclamptic groups, respectively.
Conclusion: The results of this study revealed that there is a significant relationship between BMI and the risk of preeclampsia, so it can be said that BMI may be one of the ways to diagnose preeclampsia
Interactive Process Identification and Selection from SAP ERP
SAP ERP is one of the most popular information systems supporting various
organizational processes, e.g., O2C and P2P. However, the amount of processes
and data contained in SAP ERP is enormous. Thus, the identification of the
processes that are contained in a specific SAP instance, and the creation of a
list of related tables is a significant challenge. Eventually, one needs to
extract an event log for process mining purposes from SAP ERP. This demo paper
shows the tool Interactive SAP Explorer that tackles the process identification
and selection problem by encoding the relational structure of SAP ERP in a
labeled property graph. Our approach allows asking complex process-related
queries along with advanced representations of the relational structure
TraVaG: Differentially Private Trace Variant Generation Using GANs
Process mining is rapidly growing in the industry. Consequently, privacy
concerns regarding sensitive and private information included in event data,
used by process mining algorithms, are becoming increasingly relevant.
State-of-the-art research mainly focuses on providing privacy guarantees, e.g.,
differential privacy, for trace variants that are used by the main process
mining techniques, e.g., process discovery. However, privacy preservation
techniques for releasing trace variants still do not fulfill all the
requirements of industry-scale usage. Moreover, providing privacy guarantees
when there exists a high rate of infrequent trace variants is still a
challenge. In this paper, we introduce TraVaG as a new approach for releasing
differentially private trace variants based on \text{Generative Adversarial
Networks} (GANs) that provides industry-scale benefits and enhances the level
of privacy guarantees when there exists a high ratio of infrequent variants.
Moreover, TraVaG overcomes shortcomings of conventional privacy preservation
techniques such as bounding the length of variants and introducing fake
variants. Experimental results on real-life event data show that our approach
outperforms state-of-the-art techniques in terms of privacy guarantees, plain
data utility preservation, and result utility preservation
Prevalence of Anaerobic Bacteria (P.gingivalis) as Major Microbial Agent in the Incidence Periodontal Diseases by Meta-analysis
Statement of the Problem: Periodontal diseases are complex oral diseases characterized by bacterial-induced inflammatory destruction of tooth-supporting tissues. Porphyromonas gingivalis (P. gingivalis) is a common gram-negative anaerobic oral bacteria strongly associated with periodontal disease.
Purpose: The present study was conducted to estimate prevalence of P. gingivalis in patients with periodontal diseases by using meta-analysis method.
Martials and Method: Different databases including PubMed, EmBase, Scopus, the Institute for Scientific Information (ISI) Web of Science, and the Cochrane Library were searched to identify original English-language studies addressing prevalence of P. gingivalis in periodontal diseases up to December 2014. The random effects model was applied in the meta-analysis and the heterogeneity between studies was assessed using a Cochran test and the I2 index. Funnel plots and Egger test were used to examine publication bias. Statistical analyses were performed using STATA version 12.
Results: Forty-two eligible studies published during 1993- 2016 were selected for meta-analysis. Considering all the included studies, the total sample size was 5,884 individuals containing 2,576 healthy people with a mean age of 37.21±7.45 years and 3,308 periodontal patients with a mean age of 44.16±8.35 years. Overall, the prevalence of P. gingivalis was 78% [95% CI: 74-81] in periodontal diseases group and 34% [95% CI: 26-41] in healthy individuals. There was a significantly higher prevalence of P.gingivalis in individuals with periodontal diseases compared to healthy subjects [78% versus 34%, respectively].
Conclusion: This study indicates that P. gingivalis is highly present in subjects with periodontal diseases and it also appears in periodontally healthy people, although to a lesser extent. Thus, the presence of P. gingivalis increases the chance of periodontal disease and it can be considered as a main potential risk factor
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