Au sujet du débit maximal de la rivière Mistassibi durant la période printanière

Mario Lefebvre

doi:10.1139/l01-071

Stochastic Modeling of Microgrinding Wheel Topography

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4024002 ◽

2013 ◽

Vol 1 (2) ◽

Cited By ~ 2

Author(s):

Jacob A. Kunz ◽

J. Rhett Mayor

Keyword(s):

Stochastic Model ◽

Stochastic Modeling ◽

Process Modeling ◽

Grinding Wheel ◽

Analytic Model ◽

Geometric Accuracy ◽

Simulation Techniques ◽

Wheel Topography ◽

A New Technique ◽

The Individual

Superabrasive microgrinding wheels are used for jig grinding of microstructures using various grinding approaches. The desire for increased final geometric accuracy in microgrinding leads to the need for improved process modeling and understanding. An improved understanding of the source of wheel topography characteristics leads to better knowledge of the interaction between the individual grits on the wheel and the grinding workpiece. Analytic stochastic modeling of the abrasives in a general grinding wheel is presented as a method to stochastically predict the wheel topography. The approach predicts the probability of the number of grits within a grind wheel, the individual grit locations within a given wheel structure, and the static grit density within the wheel. The stochastic model is compared to numerical simulations that imitate both the assumptions of the analytic model where grits are allowed to overlap and the more realistic scenario of a grind wheel where grits cannot overlap. A new technique of grit relocation through collective rearrangement is used to limit grit overlap. The results show that the stochastic model can accurately predict the probability of the static grit density while providing results two orders of magnitude faster than the numerical simulation techniques. It is also seen that grit overlap does not significantly impact the static grit density allowing for the simpler, faster analytic model to be utilized without sacrificing accuracy.

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Auditor Competence, Independence And Their Influence On Audit Quality (Empirical Study At Public Accountant Office Of Padang)

10.31227/osf.io/pzus5 ◽

2019 ◽

Author(s):

Agussalim

Keyword(s):

Decision Making ◽

Linear Regression ◽

Audit Quality ◽

Auditor Independence ◽

High Quality ◽

Financial Reports ◽

Client Relationship ◽

Regression Correlation ◽

Public Accountant

High quality of audit will produce reliable financial reports as a basis for decision making. This study aims to investigate the influence of auditors competence and independence toward audit quality either partially or simultaneously. The sample of this study is auditor at Public Accountant Office of Padang a total of 32 respondent. The analysis of data is conducted by using multiple linear regression, correlation and determination. The results of this study shows that educational indicator in auditor competence is more dominant contributing of 34.42%, while auditor independence for indicator of long auditor - client relationship is more dominant of 25.49%. In terms of audit quality, timely indicator gives the larget contribution of 25.40%. Either partially or simultaneously the competence and independence influence significantly toward quality audit. This is supported by information generated in this study that the degree of sensitivity is very strong of 81. 17% where the level of truth or accuracy of audit quality is determined by the competence and independence of the auditors. Based on the analysis result, it shows that the competence and independence affect the audit quality at Public Accountant Office of Padang either partially or simultaneously which produce a good quality of the audit work.

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PENGARUH LIKUIDITAS, SOLVABILITAS DAN PROFITABILITAS TERHADAP HARGA SAHAM PADA PERUSAHAAN YANG TERDAFTAR DALAM INDEKS LQ 45

SULTANIST: Jurnal Manajemen dan Keuangan ◽

10.37403/sultanist.v6i2.123 ◽

2019 ◽

Vol 6 (2) ◽

pp. 16-23

Author(s):

Tri Ade Tiya ◽

Yansen Siahaan ◽

Jubi Jubi ◽

Sepbeariska Manurung

Keyword(s):

Linear Regression ◽

Data Collection ◽

Multiple Linear Regression ◽

Correlation Coefficient ◽

Stock Prices ◽

T Test ◽

Coefficient Of Determination ◽

Analysis Techniques ◽

Negative Effect ◽

Regression Correlation

The purpose of this research is to describe liquidity,solvability, profitability and stock pricesand to know influence of liquidity, solvability and profitabilityto stock prices at the Companieslisted in LQ 45 Index.The research was using qualitative desriptive analysis and quantitative desriptive analysis. The data collection was using documentation. The analysis techniques used are multiple linear regression, correlation coeffient, coefficient of determination, hypothesis testing.The result of regression are liquidity, solvability and profitability have a negative effect on stock prices at the Companies listed in the LQ 45 Index.The results analysis of the correlation coefficient and determination coefficient is known that there is a medium relationship between liquidity, solvability and profitability of stock prices and stock prices are more influenced by other factors not examined in this research. The results of F testit is known that liquidity, solvability and profitability have a significant effect on stock prices at the Companies listed in the LQ 45 Index simultaneously. The results of the t test it is known that partially liquidity and solvability have a significant effect and profitability has no significant effect on stock prices at the Companies listed in the LQ 45 Index.The suggestion of this research is that the company should manage current assets optimally to increase revenue, control the use of debt, and distribute dividends to investors so that investors are interested in investing capital in the company.

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Pengaruh Likuiditas dan Solvabilitas Terhadap Rentabilitas Ekonomis pada Koperasi Sawit Usaha Manunggal Desa Seresam Kecamatan Seberida Kabupaten Indragiri Hulu

J-MAS (Jurnal Manajemen dan Sains) ◽

10.33087/jmas.v5i1.147 ◽

2020 ◽

Vol 5 (1) ◽

pp. 48

Author(s):

Irawati Irawati ◽

Fitria Ningsih

Keyword(s):

Linear Regression ◽

Multiple Linear Regression ◽

Correlation Coefficient ◽

Palm Oil ◽

Quantitative Method ◽

Regression Correlation

This research was conducted at Manunggal Palm Oil Cooperative in Seresam Village, Seberida District, Indragiri Hulu Regency. Researchers. The research was started from 2013 to 2018. The analysis applied the quantitative method with Multiple Linear Regression, Correlation Coefficient and determination and then testing the hypothesis using SPSS Version 21. The result of this research is that liquidity has no effect on economic profitability. While solvency affects economic rentability.While simultaneous liquidity and solvency affect economic profitability.

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Effect of Boiling on Carotenoids content of Pumpkin available in Damascus, Syria

Research Journal of Pharmacy and Technology ◽

10.52711/0974-360x.2021.00981 ◽

2021 ◽

pp. 5642-5646

Author(s):

Hala Juha ◽

Fida Amali

Keyword(s):

Linear Regression ◽

Correlation Coefficient ◽

Spectrophotometric Method ◽

Analytical Method ◽

Beta Carotene ◽

Local Market ◽

Beer's Law ◽

Beer’S Law ◽

Standard Solution ◽

Regression Correlation

The carotenoids contents of pumpkin were determined in this study by spectrophotometric method. This method was applied on beta-carotene as standard solution as well as samples. The absorption were determined at λmax 454 nm, the analytical method was validated by evaluating linearity, precision, accuracy, LODs, and LOQs of the analyts. Beer’s law is obeyed over the concentration of (0.3-9) µg/ml with a linear regression correlation coefficient of 0.9986, and recovery in range from 98.5-102.2%. After the validation was performed using standard solution, the method then was applied on samples of pumpkin available in local market in Syria after extraction the carotenoids by using Acetone/ Dichloromethane 70/30 .The results ranged between 216.46 - 80.56 µg/g. During boiling for pumpkin, the level of carotenoid reduced between 0.45-13.26 %, 0.18 – 23.07%, 17.3-40.54%, 22.65-51.73%, 14.91_55.82% and 26.16 – 72.56%, for 5, 10, 15, 30, 45 and 60 min respectively. According to the obtained result results, it is concluded that the boiling reduced carotenoid at different rates.

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Mathematical basis of stochastic modeling multicomponent risks in security systems

Technology of technosphere safety ◽

10.25257/tts.2021.4.94.125-143 ◽

2021 ◽

Vol 94 ◽

pp. 125-143

Author(s):

M. Yu. Prus ◽

Keyword(s):

Stochastic Model ◽

Stochastic Modeling ◽

Security Systems ◽

Mathematical Basis ◽

Current State ◽

System Risk ◽

Protected Object ◽

Technical Systems ◽

Labor Resources ◽

Anthropogenic Risks

Introduction. It is shown that the development of methods for modeling multicomponent risks is a promising direction for improving information and analytical support for control in security systems. The purpose of the study is to develop new approaches to the study of natural, technogenic and anthropogenic risks based on stochastic modeling of the structure of multicomponent risks in socio-technical systems. Methods of stochastic modeling are based on a matrix representation of risk components, detailing the states of the protected object and the probabilistic characteristics of the functioning of security systems. Results and discussion. A method for analyzing multicomponent risks is presented, reflecting in-depth detailing of the states of the protected object and the probabilistic characteristics of the functioning of security systems. A stochastic model has been built that describes the structure of risk as a result of the interaction of two components, a multiplier and an accelerator, associated with various elements of the model, which, respectively, determine the possibility of occurrence of dangerous events, as well as the degree of vulnerability of protected objects. A connection is established between the indicators of expected losses in a certain territory with the presence of forces, means and systems of protection against the effects of hazardous factors and their current state. The procedures for determining the main parameters of the proposed stochastic model based on statistical and expert methods are discussed. A mathematical toolkit has been created for comparative analysis of the effectiveness of measures to reduce risks in socio-technical systems. The problem of multicriteria combinatorial optimization of planned costs and distribution of financial, material, technical and labor resources in territorial security systems is formulated. Conclusions. Methods for modeling multicomponent risks can be used to create effective algorithms for supporting risk-oriented management in security systems. Key words: stochastic modeling, multicomponent risk, socio-technical system, risk management, security system.

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Effects of in-sewer processes: a stochastic model approach

Water Science & Technology ◽

10.2166/wst.2005.0074 ◽

2005 ◽

Vol 52 (3) ◽

pp. 171-180 ◽

Cited By ~ 4

Author(s):

J. Vollertsen ◽

A.H. Nielsen ◽

W. Yang ◽

T. Hvitved-Jacobsen

Keyword(s):

Organic Matter ◽

Hydrogen Sulfide ◽

Stochastic Model ◽

Gas Phase ◽

Stochastic Modeling ◽

Transport Processes ◽

Water Phase ◽

Model Concept ◽

Volatile Substances ◽

Model Approach

Transformations of organic matter, nitrogen and sulfur in sewers can be simulated taking into account the relevant transformation and transport processes. One objective of such simulation is the assessment and management of hydrogen sulfide formation and corrosion. Sulfide is formed in the biofilms and sediments of the water phase, but corrosion occurs on the moist surfaces of the sewer gas phase. Consequently, both phases and the transport of volatile substances between these phases must be included. Furthermore, wastewater composition and transformations in sewers are complex and subject to high, natural variability. This paper presents the latest developments of the WATS model concept, allowing integrated aerobic, anoxic and anaerobic simulation of the water phase and of gas phase processes. The resulting model is complex and with high parameter variability. An example applying stochastic modeling shows how this complexity and variability can be taken into account.

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Stochastic Modeling for Environmental Stress Screening

Journal of Applied Probability ◽

10.1017/s0021900200011311 ◽

2014 ◽

Vol 51 (02) ◽

pp. 387-399 ◽

Cited By ~ 1

Author(s):

Ji Hwan Cha ◽

Maxim Finkelstein

Keyword(s):

Stochastic Model ◽

Environmental Stress ◽

Stochastic Modeling ◽

Population Characteristics ◽

Latent Defects

Environmental stress screening (ESS) of manufactured items is used to reduce the occurrence of future failures that are caused by latent defects by eliminating the items with these defects. Some practical descriptions of the relevant ESS procedures can be found in the literature; however, the appropriate stochastic modeling and the corresponding thorough analysis have not been reported. In this paper we develop a stochastic model for the ESS, analyze the effect of this operation on the population characteristics of the screened items, and also consider the relevant optimization issues.

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Periodic Fluctuations in the Incidence of Gastrointestinal Cancer

Frontiers in Oncology ◽

10.3389/fonc.2021.558040 ◽

2021 ◽

Vol 11 ◽

Author(s):

Mun-Gan Rhyu ◽

Jung-Hwan Oh ◽

Tae Ho Kim ◽

Joon-Sung Kim ◽

Young A Rhyu ◽

...

Keyword(s):

Colorectal Cancer ◽

Gastric Cancer ◽

Stem Cells ◽

Linear Regression ◽

Stochastic Model ◽

Cancer Incidence ◽

Linear Regression Model ◽

Regression Models ◽

Log Linear ◽

Fluctuation Model

PurposeNative stem cells can be periodically replaced during short and long epigenetic intervals. Cancer-prone new stem cells might bring about periodic (non-stochastic) carcinogenic events rather than stochastic events. We investigated the epigenetic non-stochastic carcinogenesis by analyzing regular fluctuations in lifelong cancer incidence.Materials and MethodsKorean National Cancer Screening Program data were collected between 2009 and 2016. Non-linear and log-linear regression models were applied to comparatively evaluate non-stochastic and stochastic increases in cancer incidence. Prediction performances of regression models were measured by calculating the coefficient of determination, R2.ResultsThe incidence of gastric and colorectal cancers fluctuated regularly during both short (8 years) and long (20 years) intervals in the non-linear regression model and increased stochastically in the log-linear regression model. In comparison between the 20-year interval fluctuation model and the stochastic model, R2 values were higher in the 20-year interval fluctuation model of men with gastric cancer (0.975 vs. 0.956), and in the stochastic model of men with colorectal cancer (0.862 vs. 0.877) and women with gastric cancer (0.837 vs. 0.890) and colorectal cancer (0.773 vs. 0.809). Men with gastric cancer showed a high R2 value (0.973) in the 8-year interval fluctuation model as well.ConclusionLifelong incidence of gastrointestinal cancer tended to fluctuate during short and long intervals, especially in men with gastric cancer, suggesting the influence of an epigenetic schedule.

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PENINGKATAN PENDAPATAN MASYARAKAT URBAN

JURNAL LENTERA BISNIS ◽

10.34127/jrlab.v8i1.259 ◽

2019 ◽

Vol 8 (1) ◽

pp. 1

Author(s):

Bambang Hermanto ◽

Hamizar Hamizar ◽

Isnaini Hijriyah Kurniasari ◽

Sri Setiawati

Keyword(s):

Linear Regression ◽

Font Size ◽

City Growth ◽

Know How ◽

Civil Registration ◽

Retail Business ◽

Medium Enterprise ◽

The Government ◽

Regression Correlation

Depok City growth as a develop City in Indonesia and as the result Depok became one of the cities that overrun by the urban from various of region in Republic of Indonesia. This research is aimed to know how far the role of urban in the minority area around Bus station in especially Depok City and people of Pancoranmas district in general in empowering the people’s economy especially in supporting, guiding, and developing retail business. The method used to analyzethis research is linear regression, correlation coefficient and determination coefficient. The result shown that the earnings and business run by the urban in Depok is good. However, there is a legality problem regarded the government license which is caused by the majority of the urban do not have a clear identity data and as the result the business of the urban won’t last longer. Therefore, Depok Local Government must take role especially the Department of Population and Civil Registration, Social Affairs and Department of Cooperatives of Small, Medium Enterprise in giving accompaniment towards the urban entrepreneursKeywords: Urban, Retail Business, Earnings.Depok City growth as a develop City in Indonesia and as the result Depok became one of the cities that overrun by the urban from various of region in Republic of Indonesia. This research is aimed to know how far the role of urban in the minority area around Bus station in especially Depok City and people of Pancoranmas district in general in empowering the people’s economy especially in supporting, guiding, and developing retail business. The method used to analyzethis research is linear regression, correlation coefficient and determination coefficient. The result shown that the earnings and business run by the urban in Depok is good. However, there is a legality problem regarded the government license which is caused by the majority of the urban do not have a clear identity data and as the result the business of the urban won’t last longer. Therefore, Depok Local Government must take role especially the Department of Population and Civil Registration, Social Affairs and Department of Cooperatives of Small, Medium Enterprise in giving accompaniment towards the urban entrepreneurs <span style="font-size: 10.0pt; mso-bidi-font-size: 12.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: EN-US;">Keywords<span style="font-size: 10.0pt; mso-bidi-font-size: 12.0pt; font-family: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: EN-US;">: Urban, Retail Business, Earnings.

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