scholarly journals Composing Problem Solvers for Simulation Experimentation: A Case Study on Steady State Estimation

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e91948 ◽  
Author(s):  
Stefan Leye ◽  
Roland Ewald ◽  
Adelinde M. Uhrmacher
Author(s):  
Tomonari Kawai ◽  
Katsuhiro Ichiyanagi ◽  
Takuo Koyasu ◽  
Kazuto Yukita ◽  
Yasuyuki Goto

This paper describes an application of neural networks for forecasting the flow rate upper district of dams for hydropower plants. The forecasting of recession characteristics of the river flow after rainfalls is important with respect to system operation and dam management. We present a method for improving the precision of forecasting flow rate upper district of dams by utilizing steady-state estimation and recession time constant of the river flow. A case study was carried out on the upper district of the Yahagi River in Central Japan. It is found from our investigations that the forecasting accuracy is improved to 18.6% from 25.8% with a forecasted error of the total amount of river flow by using steady-state estimation.


1981 ◽  
Vol 107 (9) ◽  
pp. 1114-1115
Author(s):  
Gerhard H. Jirka ◽  
Masataka Watanabe

2009 ◽  
Vol 73 (20) ◽  
pp. 6052-6064 ◽  
Author(s):  
T.L. Ku ◽  
S. Luo ◽  
S.J. Goldstein ◽  
M.T. Murrell ◽  
W.L. Chu ◽  
...  

2017 ◽  
Vol 7 (3) ◽  
pp. 61
Author(s):  
Pia Helena Lappalainen

In their role as problem solvers, engineers are expected to take responsibility for the grand societal challenges that require technical expertise and innovation. This urges them to broaden their horizon from the traditional, deeply technological world view to one that examines the surrounding globe with empathy and social responsibility. Such a call for systems intelligence necessitates a novel approach to engineering education to allow students to practice systemic capabilities. As methodology, life-philosophical pedagogy was experimented with in an English language course that was integrated with the Philosophy and Systems Thinking lecture series. Such pedagogy deviates from conventional methodology in that instead of focusing on correcting deficiencies and filling competence gaps, it takes a midwife approach and recognizes the potential in individuals and delivers the abundance in them. The principles of positive psychology and frameworks of socio-emotive intelligence guide the reflective workout in the course, catalyzing, stimulating and rooting new thinking. Ultimately the course promotes self-growth, intentional change and overall life management, while allowing students to rehearse various interpersonal skills relevant for industrial tasks.


2017 ◽  
Author(s):  
Stelios G. Vrachimis ◽  
Demetrios G. Eliades ◽  
Marios M. Polycarpou

Abstract. Hydraulic state estimation in water distribution networks is the task of estimating water flows and pressures in the pipes and nodes of the network based on some sensor measurements. This requires a model of the network, as well as knowledge of demand outflow and tank water levels. Due to modeling and measurement uncertainty, standard state-estimation may result in inaccurate hydraulic estimates without any measure of the estimation error. This paper describes a methodology for generating hydraulic state bounding estimates based on interval bounds on the parametric and measurement uncertainties. The estimation error bounds provided by this method can be applied to estimate the unaccounted-for water in water distribution networks. As a case study, the method is applied to a transport network in Cyprus, using actual data in real-time.


2017 ◽  
Vol 47 (1) ◽  
pp. 61-79 ◽  
Author(s):  
Heather Kanuka ◽  
Summer Cowley

The purpose of this qualitative case study was to gain insights into how academics understand undergraduate graduand attributes. The findings reveal some alignment in views about student attributes, including that they are engaged citizens, are self-directed, have imagination, are questioning, are flexible, display leadership, are problem solvers, and possess character. This consistency, however, does not include the spectrum of views on how these attributes are conceived and developed. The findings reveal a range of interpretations regarding the kinds and levels of understandings of how graduand student attributes are developed throughout an undergraduate program of study. The findings indicate that (i) a shared understanding does not exist on how academics construe student attributes, (ii) academics do not share common meanings about the core achievements of a higher education, or how these are developed through students’ undergraduate programs, and (iii) student attributes tend not to be perceived as developing from the usual process of an undergraduate education.  


Author(s):  
H. S. Tzou ◽  
R. Ye

Abstract Piezothermoelastic effects of distributed piezoelectric sensors and actuators are investigated. Vibration control of piezoelectric laminates subjected to a steady-state temperature field is studied. A new 3-D piezothermoelastic finite element with three internal degrees of freedom is formulated using a variational formulation. A system equation for the piezoelectric continuum exposed to combined elastic, electric, and thermal fields is formulated. Distributed sensing and control equations are derived. All these effects are studied in a case study.


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