A model of the process of writing and deleting file information on a disk with NTFS

2019 ◽  
Vol 0 (9/2019) ◽  
pp. 19-25
Author(s):  
Andrzej Chojnacki ◽  
Fryderyk Darnowski
Keyword(s):  
Mathematical Model ◽  
Control Theory ◽  
File System ◽  
New Technology ◽  
Transition Function ◽  
The State ◽  
System File

This paper aims at demonstrating a mathematical model of the process of writing and deleting information about files on a disk, using the contents of the $MFT system file, i.e. in a file generated in the NTFS (New Technology File System). The presented model uses the language of control theory, where the state of the system is equal to the state of the disk and the state of the $MFT file, and where control is understood as undertaking the action of writing or deleting. The deterministic nature of the process and its stationarity were assumed. Then, based on the transition function after its specification, we suggest constructing further inverse images of possible prior states at subsequent stages of data writing or deletion. The obtained results form the basis for the implementations developed.

A Ball-Balancing System for Demonstration of Basic Concepts in the State-Space Control Theory

1974 ◽  
Vol 11 (4) ◽  
pp. 367-376 ◽  
Author(s):  
V. Jørgensen
Keyword(s):  
Mathematical Model ◽  
Control Theory ◽  
Physical Properties ◽  
Graduate Education ◽  
State Space ◽  
The State ◽  
Basic Concepts ◽  
Conditions Of Stability ◽  
The Mathematical Model

The Ball-balancing Systems is intended to demonstrate the basic concepts in the state-space control theory in the graduate education. The physical properties of the system are stated and the mathematical model is evaluated. Conditions of stability are discussed.

scholarly journals Modelling the impact of delaying vaccination against SARS-CoV-2 assuming unlimited vaccine supply

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Marcos Amaku ◽  
Dimas Tadeu Covas ◽  
Francisco Antonio Bezerra Coutinho ◽  
Raymundo Soares Azevedo ◽  
Eduardo Massad
Keyword(s):  
Mathematical Model ◽  
Vaccination Campaign ◽  
Vaccination Rate ◽  
Sao Paulo ◽  
The State ◽  
São Paulo ◽  
Health Authorities ◽  
The World ◽  
The Moment ◽  
The Impact

Abstract Background At the moment we have more than 177 million cases and 3.8 million deaths (as of June 2021) around the world and vaccination represents the only hope to control the pandemic. Imperfections in planning vaccine acquisition and difficulties in implementing distribution among the population, however, have hampered the control of the virus so far. Methods We propose a new mathematical model to estimate the impact of vaccination delay against the 2019 coronavirus disease (COVID-19) on the number of cases and deaths due to the disease in Brazil. We apply the model to Brazil as a whole and to the State of Sao Paulo, the most affected by COVID-19 in Brazil. We simulated the model for the populations of the State of Sao Paulo and Brazil as a whole, varying the scenarios related to vaccine efficacy and compliance from the populations. Results The model projects that, in the absence of vaccination, almost 170 thousand deaths and more than 350 thousand deaths will occur by the end of 2021 for Sao Paulo and Brazil, respectively. If in contrast, Sao Paulo and Brazil had enough vaccine supply and so started a vaccination campaign in January with the maximum vaccination rate, compliance and efficacy, they could have averted more than 112 thousand deaths and 127 thousand deaths, respectively. In addition, for each month of delay the number of deaths increases monotonically in a logarithmic fashion, for both the State of Sao Paulo and Brazil as a whole. Conclusions Our model shows that the current delay in the vaccination schedules that is observed in many countries has serious consequences in terms of mortality by the disease and should serve as an alert to health authorities to speed the process up such that the highest number of people to be immunized is reached in the shortest period of time.

scholarly journals Recent Developments in Coatings, Gratings, and Reflective Components

1984 ◽  
Vol 79 ◽  
pp. 607-616
Author(s):  
R. R. Shannon
Keyword(s):  
State Of The Art ◽  
New Technology ◽  
The State ◽  
Current Technology ◽  
Large Size ◽  
Incoming Radiation ◽  
Recent Developments ◽  
Electronic Sensors ◽  
Large Primary ◽  
Telescope System

The requirements on gratings and coatings for astronomical use differ from the general industrial requirements primarily in the scale of the components to be fabricated. Telescopes have large primary mirrors which require large coating plants to handle the components. Dispersive elements are driven by the requirement to be efficient in the presence of large working apertures, and usually optimize to large size in order to efficiently use the incoming radiation. Beyond this, there is a “new” technology of direct electronic sensors that places specific limits upon the image scale that can be used at the output of a telescope system, whether direct imagery or spectrally divided imagery is to be examined. This paper will examine the state of the art in these areas and suggest some actions and decisions that will be required in order to apply current technology to the predicted range of large new telescopes.

Optimization Control of the Bullwhip Effect in Supply Chain Inventory

2014 ◽  
Vol 945-949 ◽  
pp. 3187-3190
Author(s):  
Hai Dong ◽  
Jin Hua Liu ◽  
Liang Yu Liu
Keyword(s):  
Mathematical Model ◽  
Supply Chain ◽  
Control Theory ◽  
Inventory Control ◽  
Pid Controller ◽  
Bullwhip Effect ◽  
Control Gain ◽  
Optimization Control ◽  
Suitable Combination ◽  
The Mathematical Model

The bullwhip effect was caused by fuzzy demand among the enterprises. In order to reduce this effect, control theory was applied to solve the inventory in supply chain. Firstly, inventory control in supply chain and the bullwhip effect was researched. Secondly, a kind of proportional integral differential (PID) controller was developed for inventory control in a three-level supply chain, and the mathematical model of the PID controller for inventory control was presented. Finally, the results show that the PID controller can evidently alleviate the bullwhip effect and inventory fluctuations under the suitable combination of control gain.

scholarly journals Using the Big Data in the human resources management systems

2018 ◽  
Vol 8 (3) ◽  
pp. 129-133
Author(s):  
Goker Oge ◽  
Murat Topaloglu
Keyword(s):  
Big Data ◽  
Human Resources ◽  
Programming Languages ◽  
File System ◽  
Labour Force ◽  
Human Resources Management ◽  
Data Entry ◽  
Resources Management ◽  
Personnel Recruitment ◽  
System File

Measures like setting a destination, evaluation of performances, planning of the labour force about business, personnel recruitment, charging of personnel, informations about personnel, analytical of labour force and reporting, etc., are considered as vital problems of the human resources management. In this study, these criteria in a variety of data were collected with a large repository Apache Hadoop Distributed File System file system owned. Data entry and analysis were used Apache Pig and Java programming languages. The aim of the study is to help ‘the owners of business’ evaluate the abundance of data and to get rid of the management complexity via an application which is the biggest problem of management system in human resources. Keywords: Big Data, management of human resources, Hadoop, Pig, map-reduce

scholarly journals Classification of R&D infrastructure models in basic business incubators technology in the state of Paraná

2017 ◽  
Vol 14 (2) ◽  
pp. 239
Author(s):  
Vítor Felipe e Silva de Oliveira Nery
Keyword(s):  
Technological Development ◽  
New Technology ◽  
The State ◽  
Extensive Literature ◽  
Infrastructure Development ◽  
Business Incubators ◽  
Analytic Hierarchy ◽  
Development Models ◽  
Basic Infrastructure ◽  
Hierarchy Process

Support for the development of new technology-based business is a major challenge in Brazil. One reason is the change of the paradigm of an economy based on supply of commodities to an economy of developing and offering technology. In this environment, business incubators are presented as a key player in this process. However, incubators lack of infrastructure available for the technological development of products, as entrepreneurs begin to demand something beyond basic infrastructure. This article aims to classify research and development infrastructure models, based on the degree of importance earned by entrepreneurs belonging to incubators of technology-based companies in the state of Parana. An extensive literature review identified seven research infrastructure development models and discrete manufacturing products. These models were then classified by their features and practices. Following, a hierarchy was built, using the Analytic Hierarchy Process (AHP). Based on this hierarchy, an electronic questionnaire was designed and it was applied to 115 entrepreneurs belonging to 15 incubators of technology-based company, all located in the state of Parana. The responses were used for the construction of the weights of criteria based on the characteristics and analyzed practices. Finally, seven models were classified according to the AHP, providing incubator managers with the best options of laboratory models, according to the characteristics and needs.

Feeding Mathematical Modeling of Superalloy Vacuum-Electromagnetic Casting and its Application

2012 ◽  
Vol 629 ◽  
pp. 171-175
Author(s):  
Wen Zhong Jin ◽  
Su Fang Li ◽  
Wei Zhang
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
New Technology ◽  
Experimental Results ◽  
Electromagnetic Stirring ◽  
Shrinkage Cavity ◽  
Vacuum Casting ◽  
Electromagnetic Casting ◽  
Wide Range

The new technology of superalloy vacuum-electromagnetic casting was developed and the feeding mathematical model melt in vacuum-electromagnetic casting was established. The availability of mathematical model was approved by the experiments of the IN100 superalloy. The experimental results indicate that the feeding capacity of melt in vacuum casting can be greatly increased by imposing the 50Hz, 60A rotating electromagnetic stirring, which can decrease the central shrinkage cavity in superalloy ingots, so the quality of the superalloy ingots can be wide-range improved.

Design of Observer for Direct Current Drive

2009 ◽  
Vol 147-149 ◽  
pp. 119-124
Author(s):  
Andrius Petrovas ◽  
Roma Rinkeviciene ◽  
Saulius Lisauskas
Keyword(s):  
Mathematical Model ◽  
Control Theory ◽  
State Space ◽  
Characteristic Equation ◽  
Direct Current ◽  
Angular Speed ◽  
Current Drive

Control theory proposes to apply observers in systems with uncertain plant parameters. Observers can be used for calculation of feedback gains and getting desired, even strictly determined response requirements. The paper considers design of controller for direct current drive. As state space variables are chosen armature current and angular speed of motor. Mathematical model of the motor, operating with load which is assumed as disturbance, is elaborated. Full order Luenberg observer is designed according to desired characteristic equation of system. The results of simulation are presented and discussed.

The Means and Meanings of Carceral Mobility

2019 ◽  
pp. 93-124
Author(s):  
Ethan Blue
Keyword(s):  
American West ◽  
New Technology ◽  
Chinese Immigrants ◽  
The State ◽  
State Agencies ◽  
Border Control ◽  
Private Space ◽  
Pacific Railroad ◽  
National Border ◽  
Rapid Industrialization

This chapter explores how trains and steamboats—the iconic engines of mobility, freedom, and transcontinental connection—also served nativist designs as the new technology for mobile captivity and national expulsion. Situated between the intersection of settler economy and rapid industrialization, the chapter’s transnational exploration of deportation trains dissects the private–public partnership between state agencies and the Southern Pacific Railroad. This partnership first detained and deported Chinese immigrants in the American West, and from that experience a “hybrid public–private space” was created as an engine of deportability that affirmed national border control through rapid locomotion. After being detained, the state placed Chinese and Mexican noncitizens aboard train cars where moving segregation and speedy expulsion ensured locomotive border control. This chapter argues that historians must adopt a “mobility turn” that moves beyond the permanence of fixed carceral structures and institutions to adopt a more transnational view where the coerced and confined dislocation of people is bound to the blur of carceral motion.

Mapping the Egyptian Women’s Anti–Sexual Harassment Campaigns

Women Rising ◽  
2020 ◽  
pp. 245-258
Author(s):  
Theresa Hunt
Keyword(s):  
Sexual Harassment ◽  
New Technology ◽  
The State ◽  
Women's Activism ◽  
Consciousness Raising ◽  
The Public ◽  
Mainstream Media ◽  
International Attention ◽  
Victims Of Violence ◽  
Media Narratives

In this chapter, Theresa Hunt explores the trajectory of the anti–sexual harassment campaigns in Egypt as one example of women’s prerevolution and antiregime protest. She examines the extensive campaigns of the Egyptian Center for Women’s Rights, El Nadim Center for the Management and Rehabilitation of Victims of Violence, and the new, technology-fueled project HarassMap. By strategically gaining national and even international attention, these campaigns engaged in critique of the state’s failure to address the alarming level of sexual harassment on Cairo’s streets and pressured the state to develop appropriate policy. As these organizations combined consciousness raising with subversion of state obstacles and mobilization of the public, their work reflects aspects of the 2011 revolution that mainstream media narratives find compelling but rarely attribute to women’s activism.

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