scholarly journals 60th Anniversary of the Seminal Paper on Interval Analysis and Computations by T. Sunaga

2019 ◽  
Vol 5 (2) ◽  
pp. 137
Author(s):  
Roumen Anguelov ◽  
Svetoslav Markov
Keyword(s):  
Interval Analysis ◽  
Present Note ◽  
Social Economic ◽  
Initial Value ◽  
Seminal Paper ◽  
Practical Applications ◽  
Interdisciplinary Field ◽  
Master Thesis ◽  
Interval Solution ◽  
Computational Procedures

Sunaga considered all computational procedures, which had been  traditionally defined on real numbers, as being too ideal and proposed to replace them by the procedures on real intervals in order to make everything "more realistic". Sunaga studied many different kinds of numerical procedures including the Taylor-series interval solution of the initial-value problem of ordinary differential equations.The purpose of the present note is to mark the 60-th anniversary of the publication of the seminal work by the Japan mathematician Teruo Sunaga. The paper summarizes the results of his Master Thesis \cite{Sunaga1956}. Sunaga's work sets the foundation of the contemporary interval analysis and reliable computing. This is an interdisciplinary field, combining abstract mathematical theories and practical applications related to computer science, numerical analysis and mathematical modeling in the natural, engineering and social-economic sciences.

scholarly journals Influence of the Parameterization in the Interval Solution of Elastic Beams

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Stefano Gabriele ◽  
Valerio Varano
Keyword(s):  
Boundary Conditions ◽  
Closed Form ◽  
Interval Analysis ◽  
Elastic Beam ◽  
Elastic Beams ◽  
Analysis Theory ◽  
Set Intersection ◽  
Interval Solution ◽  
Uncertain Boundary

We are going to analyze the interval solution of an elastic beam under uncertain boundary conditions. Boundary conditions are defined as rotational springs presenting interval stiffness. Developments occur according to the interval analysis theory, which is affected, at the same time, by the overestimation of interval limits (also known as overbounding, because of the propagation of the uncertainty in the model). We suggest a method which aims to reduce such an overestimation in the uncertain solution. This method consists in a reparameterization of the closed form Euler-Bernoulli solution and set intersection.

Constraint Management Methodology for Conceptual Design Tradeoff Studies

1996 ◽  
Author(s):  
Sudhakar Y. Reddy ◽  
Kenneth W. Fertig ◽  
David E. Smith
Keyword(s):  
Conceptual Design ◽  
Imaging System ◽  
Linear Equations ◽  
Performance Model ◽  
System Level ◽  
Cost Models ◽  
Practical Applications ◽  
Constraint Management ◽  
Computational Procedures ◽  
Thermal Imaging System

Abstract This paper presents a constraint management methodology, which facilitates tradeoff studies during conceptual design. This approach represents design models as constraints between variables, and uses the resulting constraint network to automatically derive computational procedures for performing user-specified tradeoff studies. By decomposing large constraint networks into smaller pieces that can be solved robustly, this approach can solve extremely large systems of non-linear equations present in practical system models. Design Sheet is a software implementation of this methodology; it allows the designer to interactively develop models, flexibly define tradeoff studies, and quickly explore large areas of design space to study how the different performance and cost criteria tradeoff with respect to one another. Design Sheet has been used on practical applications ranging from the system-level design of spacecraft using combined performance and cost models to the preliminary design of automotive bearings. This paper demonstrates the unique capabilities of Design Sheet in performing design tradeoff studies, using a thermal imaging system performance model developed for the DARPA MADE program.

Landslides

2015 ◽  
pp. 1393-1428
Author(s):  
Snježana Mihalić Arbanas ◽  
Željko Arbanas
Keyword(s):  
Landslide Monitoring ◽  
Research Subjects ◽  
Practical Applications ◽  
Interdisciplinary Field ◽  
Landslide Hazards ◽  
Landslide Processes ◽  
Landslide Mitigation ◽  
Hazard And Risk ◽  
Land Use Policies ◽  
Landslide Mapping

Landslide research is an interdisciplinary field that primarily encompasses scientists from geomorphology, engineering geology, and geotechnical engineering in collaboration with researchers from such fields as geodesy, hydrogeology, geophysics, and many others. This chapter is intended as a resource for researchers interested in landslide engineering and landslide science to acquire a summarized review of research subjects and the state-of-the-art literature. A wide range of landslide topics are presented in the following sections: landslide mapping, landslide investigation, landslide monitoring, landslide hazard and risk assessment, and landslide stabilization and remediation measures. The results of landslide studies have practical applications to society via the avoidance, prevention, and mitigation of landslide hazards and risks. Landslide avoidance and prevention are the primary interests for land-use policies based on landslide mapping, followed by the prediction of landslide processes and their consequences. Landslide mitigation includes the development of engineering technologies for landslide investigation, monitoring, and remediation.

Landslides

2015 ◽  
pp. 474-510 ◽  
Author(s):  
Snježana Mihalić Arbanas ◽  
Željko Arbanas
Keyword(s):  
Landslide Monitoring ◽  
Research Subjects ◽  
Practical Applications ◽  
Interdisciplinary Field ◽  
Landslide Hazards ◽  
Landslide Processes ◽  
Landslide Mitigation ◽  
Hazard And Risk ◽  
Land Use Policies ◽  
Landslide Mapping

Landslide research is an interdisciplinary field that primarily encompasses scientists from geomorphology, engineering geology, and geotechnical engineering in collaboration with researchers from such fields as geodesy, hydrogeology, geophysics, and many others. This chapter is intended as a resource for researchers interested in landslide engineering and landslide science to acquire a summarized review of research subjects and the state-of-the-art literature. A wide range of landslide topics are presented in the following sections: landslide mapping, landslide investigation, landslide monitoring, landslide hazard and risk assessment, and landslide stabilization and remediation measures. The results of landslide studies have practical applications to society via the avoidance, prevention, and mitigation of landslide hazards and risks. Landslide avoidance and prevention are the primary interests for land-use policies based on landslide mapping, followed by the prediction of landslide processes and their consequences. Landslide mitigation includes the development of engineering technologies for landslide investigation, monitoring, and remediation.

Text mining stackoverflow

2016 ◽  
Vol 29 (2) ◽  
pp. 255-275 ◽  
Author(s):  
Arash Joorabchi ◽  
Michael English ◽  
Abdulhussain E. Mahdi
Keyword(s):  
Text Mining ◽  
Question Answering ◽  
Computer Programming ◽  
Educational Data Mining ◽  
Research Approach ◽  
Graph Visualization ◽  
Content Type ◽  
Practical Applications ◽  
Community Question Answering ◽  
Interdisciplinary Field

Purpose – The use of social media and in particular community Question Answering (Q & A) websites by learners has increased significantly in recent years. The vast amounts of data posted on these sites provide an opportunity to investigate the topics under discussion and those receiving most attention. The purpose of this paper is to automatically analyse the content of a popular computer programming Q & A website, StackOverflow (SO), determine the exact topics of posted Q & As, and narrow down their categories to help determine subject difficulties of learners. By doing so, the authors have been able to rank identified topics and categories according to their frequencies, and therefore, mark the most asked about subjects and, hence, identify the most difficult and challenging topics commonly faced by learners of computer programming and software development. Design/methodology/approach – In this work the authors have adopted a heuristic research approach combined with a text mining approach to investigate the topics and categories of Q & A posts on the SO website. Almost 186,000 Q & A posts were analysed and their categories refined using Wikipedia as a crowd-sourced classification system. After identifying and counting the occurrence frequency of all the topics and categories, their semantic relationships were established. This data were then presented as a rich graph which could be visualized using graph visualization software such as Gephi. Findings – Reported results and corresponding discussion has given an indication that the insight gained from the process can be further refined and potentially used by instructors, teachers, and educators to pay more attention to and focus on the commonly occurring topics/subjects when designing their course material, delivery, and teaching methods. Research limitations/implications – The proposed approach limits the scope of the analysis to a subset of Q & As which contain one or more links to Wikipedia. Therefore, developing more sophisticated text mining methods capable of analysing a larger portion of available data would improve the accuracy and generalizability of the results. Originality/value – The application of text mining and data analytics technologies in education has created a new interdisciplinary field of research between the education and information sciences, called Educational Data Mining (EDM). The work presented in this paper falls under this field of research; and it is an early attempt at investigating the practical applications of text mining technologies in the area of computer science (CS) education.

scholarly journals The Global Trust Deficit Disorder: A Communications Perspective on Trust in the Time of Global Pandemics

2021 ◽  
Vol 71 (2) ◽  
pp. 163-186
Author(s):  
Terry Flew
Keyword(s):  
Social Sciences ◽  
Interpersonal Communication ◽  
News Media ◽  
Social Economic ◽  
Social Sciences And Humanities ◽  
Interdisciplinary Field ◽  
The Social ◽  
Media Institutions ◽  
The Media ◽  
Micro Level

Abstract There has been much discussion worldwide about the crisis of trust, with evidence of declining trust in social, economic, political and media institutions. The rise of populism, and the differing impacts of the COVID-19 pandemic between nations, has been drawing attention to wider implications of pervasive distrust, including distrust of the media. In this article, I develop three propositions. First, I identify trust studies as a rich interdisciplinary field, linking communication to other branches of the social sciences and humanities. Second, I argue that we lack a comprehensive account of how trust has been understood in communication, and that doing so requires integrating macro-societal approaches with the “meso” level of institutions, and the “micro” level of interpersonal communication. Third, I propose that a focus upon trust would open up new perspectives on two important topics—the future of news media and journalism, and the global rise of populism.

Evaluation and role of rheological properties in sludge management

1997 ◽  
Vol 36 (11) ◽  
pp. 1-8 ◽  
Author(s):  
Steven K. Dentel
Keyword(s):  
Rheological Properties ◽  
Initial Value ◽  
Rheological Characterization ◽  
Practical Applications ◽  
Treatment Processes ◽  
Technological Advances ◽  
Sludge Characterization ◽  
Empirical Perspective

Rheological characterization of sludges represents one of the few examples of fundamentally derivable properties that has also been successfully related to actual sludge treatment processes. In understanding the relevance and utility of sludge rheology for practical applications, an historical perspective is of some initial value, and this paper summarizes previous developments in the rheological characterization of sludges and other non-Newtonian slurries, both from a theoretical and empirical perspective. In both cases, attention is brought to subtleties that must be considered if uniform and consistent rheological descriptions are to be obtained. Causes of the complex and variable rheological properties observed in sludges are then considered, with attention brought to particular aspects of upstream processes where some influence on sludge viscosity might be exerted. Finally, some practical aspects of rheometry are described. Recent research suggests that a variety of methods for sludge characterization and process optimization can be based on rheological measurements. Examples are presented that utilize both complex and relatively simplified technologies for this purpose, and some predictions are attempted of the probable directions for future developments. Internationally, approaches have differed and, while this diverse and competitive environment favors technological advances, the paper concludes by pointing out the need for consistency in rheological methods where fundamentally based parameters or regulatory concerns may be involved.

A Method for Static Interval Analysis of Uncertain Structures with Interval Parameters

2014 ◽  
Vol 950 ◽  
pp. 79-85 ◽  
Author(s):  
Jian Guo Zhang
Keyword(s):  
Interval Analysis ◽  
Uncertain Parameters ◽  
Interval Numbers ◽  
Interval Equations ◽  
Solution Methods ◽  
Calculation Results ◽  
Interval Solution ◽  
Linear Interval ◽  
Linear Interval Equations ◽  
Discrete Values

By representing the uncertain parameters as interval numbers, the static linear interval equations about the structural system were obtained in this paper by means of the finite element method. These equations are linear interval equations, for which some solution methods were discussed and a step-dividing method was presented. In this method, the independent uncertain parameters were given the discrete values within each interval, and the linear interval equations were changed into the corresponding certain ones. And then the boundaries of every interval solution components are determined by searching for the maximum and minimum values of the equation solutions. Some mathematical examples were used to examine the correctness and efficiency of the algorithm and which was applied to static interval analysis of engineering problems. Compared with other methods, the calculation results show that the algorithm of this paper is efficient and accurate.

scholarly journals Simulation of Intermittent Turning Processes

1991 ◽  
Vol 113 (3) ◽  
pp. 458-466 ◽  
Author(s):  
G. M. Zhang ◽  
S. Yerramareddy ◽  
S. M. Lee ◽  
S. C.-Y. Lu
Keyword(s):  
Simulation Model ◽  
Initial Value ◽  
Principle Of Superposition ◽  
Practical Applications ◽  
Vibratory Motion ◽  
Intermittent Turning ◽  
Experimental Findings ◽  
The Impact ◽  
Chip Load

A simulation model is developed to study the dynamic characteristics of intermittent turning operations. Factors such as chip load, free-vibration of the toolpost structure, and nonhomogeneous hardness distribution in the material being cut are incorporated in the model. The principle of superposition is used in the formulation of the simulation algorithm. The impact between the cutting tool and the workpiece at the start of every cutting period during machining is treated as an initial value problem. The simulation model provides a quantitative evaluation of the tool vibratory motion during the intermittent turning process. Study of the cutting dynamics based on the simulation results not only confirms the experimental findings, but also indicates that increasing the static stiffness of the toolpost structure is an effective approach to control the tool vibratory motion. The determination of probability of tool breakage under various spindle speed settings is presented as an example to demonstrate the practical applications of the simulation model developed in this work.

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