MODELING THE IMPACT OF DESIGN ELEMENTS ON THE SCATTERING OF GRANULAR ENVIRONMENT AND THE IMPACT OF EXTERNAL FACTORS

Author(s):  
V. P. Sharko ◽  
◽  
A.V. Tsulaia
2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Kevin C. Lee ◽  
Raghuram Sudhaakar ◽  
Jianxia Ning ◽  
Lillian Dai ◽  
Sateesh Addepalli ◽  
...  

This paper focuses on routing for vehicles getting access to infrastructure either directly or via multiple hops through other vehicles. We study routing protocol for low-power and lossy networks (RPL), a tree-based routing protocol designed for sensor networks. Many design elements from RPL are transferable to the vehicular environment. We provide a simulation performance study of RPL and RPL tuning in VANETs. More specifically, we seek to study the impact of RPL's various parameters and external factors (e.g., various timers and speeds) on its performance and obtain insights on RPL tuning for its use in VANETs. We then fine tune RPL and obtain performance gain over existing RPL.


2020 ◽  
Vol 18 (6) ◽  
pp. 1063-1078
Author(s):  
T.N. Skorobogatova ◽  
I.Yu. Marakhovskaya

Subject. This article discusses the role of social infrastructure in the national economy and analyzes the relationship between the notions of Infrastructure, Service Industry and Non-Productive Sphere. Objectives. The article aims to outline a methodology for development of the social infrastructure of Russia's regions. Methods. For the study, we used the methods of statistical and comparative analyses. The Republic of Crimea and Rostov Oblast's social infrastructure development was considered as a case study. Results. The article finds that the level of social infrastructure is determined by a number of internal and external factors. By analyzing and assessing such factors, it is possible to develop promising areas for the social sphere advancement. Conclusions. Assessment and analysis of internal factors largely determined by the region's characteristics, as well as a comprehensive consideration of the impact of external factors will help ensure the competitiveness of the region's economy.


2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Frank de Vocht ◽  
Srinivasa Vittal Katikireddi ◽  
Cheryl McQuire ◽  
Kate Tilling ◽  
Matthew Hickman ◽  
...  

Abstract Background Natural or quasi experiments are appealing for public health research because they enable the evaluation of events or interventions that are difficult or impossible to manipulate experimentally, such as many policy and health system reforms. However, there remains ambiguity in the literature about their definition and how they differ from randomized controlled experiments and from other observational designs. We conceptualise natural experiments in the context of public health evaluations and align the study design to the Target Trial Framework. Methods A literature search was conducted, and key methodological papers were used to develop this work. Peer-reviewed papers were supplemented by grey literature. Results Natural experiment studies (NES) combine features of experiments and non-experiments. They differ from planned experiments, such as randomized controlled trials, in that exposure allocation is not controlled by researchers. They differ from other observational designs in that they evaluate the impact of events or process that leads to differences in exposure. As a result they are, in theory, less susceptible to bias than other observational study designs. Importantly, causal inference relies heavily on the assumption that exposure allocation can be considered ‘as-if randomized’. The target trial framework provides a systematic basis for evaluating this assumption and the other design elements that underpin the causal claims that can be made from NES. Conclusions NES should be considered a type of study design rather than a set of tools for analyses of non-randomized interventions. Alignment of NES to the Target Trial framework will clarify the strength of evidence underpinning claims about the effectiveness of public health interventions.


2016 ◽  
Vol 8 (7) ◽  
pp. 140 ◽  
Author(s):  
Bilal Lotfi ◽  
Mohamed Karim

<p>The term competitiveness is a relative concept whose perception changes with the level of conducted analysis (nation, sector, company). Thus, a variety of internal and external factors can have deep effects on the competitiveness of a given entity. This paper aims to evaluate the competitiveness of Moroccan exports by identifying the main determinants that explain their performance. This is particularly dealing with the impact of customs’ tariff, the tariff of import, foreign demand, the share of the non-residents in the capital of domestic enterprises and the investment rate compared to the value of exporters.</p><p>Moreover, this paper presents a literature review on competitiveness and examines the main results of our econometric analysis regarding the determinants of export competitiveness applied to the top ten branches most exporters in Morocco. The gained results allow confirming the sensitivity of exports by branch to the situation of Morocco’s main trading partner namely the European Union while emphasizing, quantitatively, on the role played by the investment effort undertaken by Moroccan exporting companies in improving the competitiveness of national exports.</p>


2015 ◽  
Vol 105 (5) ◽  
pp. 621-628 ◽  
Author(s):  
C.P. Bonsignore ◽  
F. Manti ◽  
E. Castiglione

AbstractParasitoids are significant enemies of many economically important insects and there is some evidence to suggest that their actions have a role in terminating the outbreaks of forest Lepidoptera populations. In this study, we examined the impact of parasitoids on the pupae of the pine processionary moth, and highlighted the presence of several parasitoid species for this developmental stage. A higher rate of parasitism was found when the pupal density in the soil was reduced, but the rate of parasitism was not influenced by pupal morphological traits or by the presence or absence of a cocoon around a pupa. Of the external factors examined, a delay in the time of descent of larvae from the trees had a positive effect on the level of parasitism. Observational data indicated that dipteran and hymenopteran were the most abundant parasitoids to emerge from moth pupae. Our study highlights the complexity of the parasitoid–host dynamics, and stresses the importance of carefully determining environmental effects on host–parasitoid relations.


2021 ◽  
Vol 17 (4) ◽  
pp. 664-681
Author(s):  
Yuliya N. STETSYUNICH ◽  
Andrei A. ZAITSEV

Subject. The article discusses the consistency of accounting policies, internal control and constituents of corporate economic security. Objectives. The study determines the process of articulating the term Accounting Policy at the legislative and normative levels nationwide and worldwide. We compare our own interpretations of corporate economic security. The article traces the impact of the accounting policy on areas of internal control and corporate economic securities. Methods. The study is based on general methods of research, such as the dialectical method, methods of analysis and synthesis, induction and deduction, and semantic analysis. Results. The article shows the impact of internal and external factors, which also influence corporate economic security and translate into the formation of corporate accounting policies. Conclusions and Relevance. Economic security is an aspect that every entity pursues. Therefore, it is important to thoroughly study how clauses of accounting policies influence the aspect from perspectives of business entities. The impact of constituents of corporate accounting policies, as evaluated herein, allow to consider adverse factors and help prevent negative consequences that internal and external factors may cause to corporate economic security. The findings contribute to accounting techniques for financial management in order to ensure the economic security. They are of practical significance for business leaders and financial personnel.


2021 ◽  
Author(s):  
Matthew Jackson ◽  
Lauren McTier ◽  
Laura A Brooks ◽  
Rochelle Wynne

Abstract Background: Although simulation-based education (SBE) has become increasingly popular as a mode of teaching in undergraduate nursing courses its effect on associated student learning outcomes remains ambiguous. Educational outcomes are influenced by SBE quality that is governed by technology, training, resources and SBE design elements. This paper reports the protocol for a systematic review to identify, appraise and synthesise the best available evidence regarding the impact of SBE on undergraduate nurses’ learning outcomes. Methods: Databases to be searched from 1st of January 1990 include the Cumulative Index to Nursing and Allied Health Literature (CINAHL), the Medical Literature Analysis and Retrieval System Online (MEDLINE), American Psychological Association (APA) PsycInfo and the Education Resources Information Centre (ERIC) via the EBSCO host platform. The Excerpta Medica database (EMBASE) will be searched via the OVID platform. We will review the reference lists of relevant articles for additional citations. A combination of search terms including ‘nursing students’, ‘simulation training, ‘patient simulation’, and ‘immersive simulation’ with common Boolean operators will be used. Specific search terms will be combined with either MeSH or Emtree terms and appropriate permutations for each database. Search findings will be imported into reference management software (Endnote© Version.X9) then uploaded into Covidence where two reviewers will independently screen titles, abstracts and retrieved full text. A third reviewer will be available to resolve conflicts and moderate consensus discussions. Quantitative primary research studies evaluating the effect of SBE on undergraduate nursing students’ educational outcomes will be included. The Mixed Methods Appraisal Tool (MMAT) will be used for quality assessment of core criteria, in addition to the Cochrane RoB 2 and ROBINS-I to assess risk of bias for randomised and non-randomised studies, respectively. Primary outcomes are any measure of knowledge, skills, or attitude. Discussion: SBE has been widely adopted by healthcare disciplines in tertiary teaching settings. This systematic review will reveal (i) the effect of SBE on learning outcomes, (ii) SBE element variability, and (iii) interplay between SBE elements and learning outcome. Findings will specify SBE design elements to inform the design and implementation of future strategies for simulation-based undergraduate nursing education.Systematic Review Registration: PROSPERO CRD42021244530


2003 ◽  
Vol 43 (4) ◽  
pp. 410-418 ◽  
Author(s):  
Ritu Lothia ◽  
Naveen Donthu ◽  
Edmund K. Hershberger
Keyword(s):  

Author(s):  
Abdul Hameed ◽  
Farheen Zahra Hussain ◽  
Khawar Naheed ◽  
Muhammad Sadiq Shahid

Purpose: A company’s capital structure is a blend of its equity and debt financing and is considered a significant factor in the valuation of any firm. The decisions related to capital structure formation play an integral role for the firms, therefore; this research tends to explore the factors of capital structure and their impact on firm performance. For this purpose, financial data for different listed companies in PSX has been gathered, and dividends and taxes are used as firm external factors.  Design/Methodology/Approach: To examine the impact, the panel data has been used for the period 2016-2020 and panel least square has been applied. Findings: The findings suggest that among the variables current ratio, dividends, taxation, total debt to total equity ratio, and the firm size are statistically significant to profitability. The study also concludes that dividends and tax have a greater impact on capital structure and firm performance.   Implications/Originality/Value: Managers and owners of the firms must make sure that their profits are used for future investments rather than payment of debts to avoid bankruptcy.  


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