Wrong Solution Research Articles

A reliability analysis method based on the intersection area division of hypersphere and paraboloid

In terms of the approximate failure probability of the limit state function (LSF), First Order Reliability Method (FORM) directly solves the failure probability through the most probable point (MPP), but it can only achieve high accuracy in the LSF with low linearity and non-linearity. Second Order Reliability Method (SORM) performs second-order expansion on the basis of MPP to improve reliability accuracy. However, the approximation may be wrong, and even has a large error in high-dimensional nonlinear problems. In order to get more precise approximation of SORM, this paper proposes an area partition method based on the Intersection Area Division Method (IADM) of Hypersphere and Paraboloid. IADM constructs a hypersphere and an approximate parabolic function of the LSF at MPP. The intersection area of the hypersphere and the approximate paraboloid is defined as the failure region from the geometric of the approximate paraboloid function, and the area of the failure region is calculated by the spherical integral. Finally, the approximation of the failure probability is determined by integrating the ratio of the area to the area of the hypersphere. Several examples proved that IADM is more stable compared with SORM which avoids the generation of wrong solutions and improves the accuracy.

Robust joint adaptive multiparameter waveform inversion with attenuation compensation in viscoacoustic media

Full-waveform inversion (FWI) has been proven as an effective method to estimate subsurface parameters by iteratively reducing the data residual between the predictions and the observations. Nevertheless, FWI is greatly dependent on the initial model, and a poor initial model will lead to an incorrect solution. Furthermore, owing to the anelasticity of the earth, seismic waves will attenuate during propagation, which results in an attenuated gradient and makes the convergence rate of FWI even worse in viscoacoustic medium. Commonly, multiparameter (e.g. velocity and Q) waveform inversion can be used to mitigate these problems. Benefiting from the theory of Q-compensated wavefield propagation, we develop a Q-compensated joint multiparameter waveform inversion method to weaken the nonlinearity of the FWI objective function, which enables it to cope with challenges related with attenuation-induced gradient energy loss and cycle skipping simultaneously. We refer to our Q-compensated joint multiparameter FWI scheme as QJMFWI. The main contributions of QJMFWI are as follows: (1) given the difficulty associated with the estimation of velocity and Q simultaneously in viscoacoustic media, QJMFWI provides a straightforward waveform inversion method for velocity and Q model construction, by which we can obtain velocity and Q information with improved accuracy and resolution; and (2) compared with conventional FWI methods, QJMFWI relaxes the requirement for a good initial velocity and Q model, which can avoid trapping into local minima. Numerical and field data examples demonstrate that QJMFWI is an effective method to invert for accurate subsurface parameters in viscoacoustic media.

University Education in a Time of Perpetually Wicked Problems

Wicked problems differ from tame ones in important ways that define significant challenges in resolving them. Among these differences are their lack of a prescriptive definition, their absence of a clear stopping rule, their emphasis on better or worse outcomes rather than right or wrong solutions, their uniqueness, and their demand that resolutions not make the problem worse. University graduates will take on central roles and leadership responsibilities for addressing the world’s wicked problems such as those identified as the United Nations Sustainable Development Goals. Those roles and responsibilities require advanced critical, systems, design, and ethical thinking skills and not just the disciplinary tactics and tame problem-solving abilities that largely comprise a university educational experience. This paper challenges the ways in which universities fail to equip their graduates with sufficient understanding of wicked problems and the approaches that offer the best chance to address them. The increasingly-granular structure of the academic year, the curricular emphasis on disciplinary rather than inter- or multi-disciplinary learning experiences, the lack of collaborative opportunities with those of other theoretical and practical perspectives, and the lack of intentional learning for critical, design, systems, and ethical thinking are discussed.

On the Effect of 3D Wave Propagation on 2D Regional‐Scale Velocity Model Building

AbstractActive seismic surveys are routinely employed by academia to study geological structure of the crust and upper mantle. Wavefields generated during these surveys are sampled at the receiver locations, but the wave‐paths traveled from a source to a sensor remains unknown. Although seismic acquisition layouts designed to investigate complex crustal‐scale environments are often two‐dimensional, the seismogram recorded at the receiver location represents information gathered along the three‐dimensional wavepaths that might offset from the 2D source/receiver profile along its transverse direction. This so‐called 3D‐effect distorts the results of 2D seismic imaging, which is unable to handle the out‐of‐plane propagation. Despite the numerous 2D seismic imaging case studies, the assessment of this issue is often overlooked. However, the problem exists ‐ especially for crustal‐scale profiles, where seismic energy propagates over distances of hundreds of kilometers and probes different crustal units. In this work we investigate the impact of 3D‐effect on the results of 2D velocity model building from the academic ocean‐bottom seismometer data. We show with polarization analysis how the 3D‐effect can manifest itself in the data domain. Using various scenarios of acquisition we evaluate the imprint of the out‐of‐plane propagation on the data and the results of full‐waveform inversion. We show that 2D velocity model building from the seismic profiles acquired in the complex geological setting can lead to wrong solution. Looking for the remedy to this issue we couple different configurations of acquisition geometries with 3D full‐waveform inversion that allow to handle the 3D effect and provide correct model reconstruction.

Quantitative data and indicators on agricultural activity

Statistical coverage and quantitative presentation of agricultural activity are of particular importance for planning agricultural, strategic, and production activities. Food production is a fundamental existential condition, that is, the essence of the existence and development of the human population, as well as animal and plant life on Earth. For all the reasons mentioned above, it is utterly important to have adequate, valid, up-to-date, and comprehensive data and indicators. Obtaining such data is a complex, difficult, time-consuming, and relatively expensive process. If the data are missing, inaccurate, out-of-date, or if they are not collected properly, then all the analyses, estimates, forecasts, and plans are bound to contain errors, resulting in wrong conclusions, decisions, and ultimately leading to wrong solutions. The problem of missing data and the presence of outliers - atypical values is particularly emphasized. In this text the most important aspects of the quantitative (statistical) coverage of agricultural activity are presented. This primarily refers to the method of obtaining the data, which can be done as a complete or a partial observation, that is, sampling. The two methods are presented through censuses, surveying and sampling, with special reference to the upcoming comprehensive census of agriculture. The process of obtaining of indicators is presented in the text, with a special focus on descriptive statistical measures. Data and indicators according to the Global Strategy for the Improvement of Agricultural and Rural Statistics, as well as data and indicators of the Food and Agriculture Organization (FAO), indicators of the Common Agricultural Policy (CAP), and indicators of the World Bank and Eurostat are presented. Based on all the means of obtaining data, while respecting the constant need to align and harmonize the system of our agricultural statistics with the requirements of the European Union, as well as considering the experiences of all the mentioned (and most important) institutions for the production of statistical data in Europe and the world, a proposal of indicators and required data for quantitative presentation of agricultural activity in the Republic of Srpska is given. In addition, the need to introduce statistical registers of agriculture, that should enable continuous quantitative monitoring of agricultural activity, was particularly emphasized.

Raising interest rates was the wrong medicine

PurposeIn this paper, the authors examine the causes of 2021–2023 inflation and evaluate whether raising interest rates is the right solution.Design/methodology/approachThe authors evaluate both the macroeconomic (too much demand) and microeconomic (monopoly pricing and supply chains) explanations for the causes of inflation.FindingsThe authors argue that the spike in inflation is due to disrupted supply chains and corporations taking advantage of the situation to raise their prices. The aggregate demand stimulus from fiscal policy had all but played out by the time inflation arose, making it an unlikely cause of said inflation.Originality/valueThe authors' paper demonstrates that raising interest rates is the wrong solution to tackling the problem of inflation, especially since it's coming from the supply side.

MODEL-ELECTING ACTIVITY WITH CIVIL ENGINEERING STUDENTS TO SOLVE A PROBLEM INVOLVING BINOMIAL DISTRIBUTION

This research presents the results of the implementation of a model-electing activity called Brickyards, designed to promote the learning of the binomial distribution. The theoretical framework used was the Models and Modeling Perspective, and the participants were undergraduate students enrolled in a probability and statistics course of the Bachelor Civil Engineering Program at the University of Guadalajara, Mexico. The activity was refined during three semesters, and here we report the models generated by the students in the fourth implementation. In the first stage of the activity of this implementation, students proposed wrong solutions, which were based on ideas of proportionality and linear thinking. The activity was designed to inhibit these types of solutions and to encourage students to realize when they are dealing with a random phenomenon, and that they need a probability distribution to solve the activity. The students used RStudio software to calculate probabilities.

Comment on “Harmonic oscillator problem in the background of a topologically charged Ellis-Bronnikov–type wormhole” by Ahmed Faizuddin

Abstract We analyse some results appeared in a paper published recently in this journal and show that the author obtained wrong solutions for the two eigenvalue equations studied. In particular, he obtained bound states for a problem that does not support them. The mistake can be traced back to a failed truncation of the power-series ansatz proposed as a possible solution. We also show that the problem is conditionally solvable and one can obtain analytical solutions only for particular values of the model parameters.

ZF Auto. v. Luxshare: Supreme Court’s Withdrawal of Judicial Assistance for Discovery from Private Arbitration

Is the judicial assistance intended for the benefit of ‘foreign or international tribunals’ under 28 USC § 1782 available for private arbitral tribunals? The Supreme Court of the United States says it is not because that assistance is intended only for tribunals vested with governmental authority and private arbitral tribunals lack such authority. This strained reading of section 1782 appears to have been reached to achieve policy objectives, not through rigorous analysis of the statutory provision itself. Although the end the Court sought to achieve is not without merit, the means chosen by the Court to achieve the same will give rise to, among others, the unintended consequence of curtailing international commercial arbitration in contravention of the federal policy favouring arbitration. This is so because the Court ignored the root cause of the problem it sought to solve, namely that section 1782 is available to ‘any interested person’ who is not required to be before any tribunal at all. Instead of trying to solve one problem with the wrong solution, the Court should have closed or Congress should close the loophole in section 1782 so that it may properly function and provide the judicial assistance as originally intended by Congress. Arbitration, arbitral tribunal, discovery, 28 USC § 1782, Hague Evidence Convention, Intel v. AMD, Intel factors

The Preservice Teachers’ Approaches Toward Incorrect Probability Problems

Identifying the mistakes in student responses and being able to manage the solution process are among the fundamental skills that should be acquired by the pre-service teachers. This skill is important in probability, about which students have a great number of misconceptions. The aim of this study was to determine the misconceptions in the student answers given by the researcher about probability and to examine the solution explanations of the preservice teachers. In this context, the student answers containing five wrong solutions were examined. Case study, one of the qualitative research methods, was used. Forty-two third grade preservice mathematics teachers participated in the study. A task-based interview was used in the study. The findings revealed that the participants were able to recognize simple and discrete probability problems more easily and provided correct solutions; however, they had difficulty in determining the universal space independent events and failed to detect the mistakes in the student answers successfully. As a result of the research, it was concluded that the importance attached to procedural knowledge should also be given to conceptual knowledge, what a concept means as well as what it does not mean should be explained, open-ended questions that will increase the power of reasoning should be used instead of typical problems, and more effective learning should be carried out by using different teaching methods and techniques.

WOMEN’S EMPLOYMENT IN AVIATION: THE CASE OF UNITED STATES (USA)

Employment is a really serious issue in that it can create an economic disruption if it is not dealt with correctly. The wrong solution for employment causes similar results. For this reason, it is important for both the economies of the country and the sector in question to solve the employment problem completely and correctly. In this context, an employment policy should be produced for the aviation sector as well as others. Employment policies should be determined in such a way that both the labour force and qualification need to increase. However, these policies should be in the direction of improving existing policies rather than a radical change. For instance, women’s employment is available in many economies. Therefore, this policy should not be radically changed; on the contrary, it should be in the form of improving existing policies. Within this scope, ignoring women while forming employment policy may have several economic and financial consequences. However, certain factors affect women's employment. These factors can be expressed as follows: the glass ceiling syndrome, the queen bee syndrome, marital status and age, educational status, mobbing and sexual harassment, and wage inequality. In this study, women's employment data are extracted from the USA labour force statistics. The data were subjected to evaluation by the content analysis method. With this method, lots of the data and information independent of one another are examined deeply. By this way general trends can be determined clearly. Therefore, the data in this study are examined within the scope of labour economics. This study concludes that women's employment in the USA aviation market follows a positive course, but this is not enough. To eliminate the insufficiency, a number of economic and financial proposals need to be implemented.

Metacognitive Effort Regulation across Cultures.

Success in cognitive tasks is associated with effort regulation and motivation. We employed the meta-reasoning approach to investigate metacognitive monitoring accuracy and effort regulation in problem solving across cultures. Adults from China, from Israel, and from Europe and North America (for simplicity: "Western countries") solved nonverbal problems and rated their confidence in their answers. The task involved identifying geometric shapes within silhouettes and, thus, required overcoming interference from holistic processing. The Western group displayed the worst monitoring accuracy, with both the highest overconfidence and poorest resolution (discrimination in confidence between the correct and wrong solutions). The Israeli group resembled the Western group in many respects but exhibited better monitoring accuracy. The Chinese group invested the most time and achieved the best success rates, demonstrating exceptional motivation and determination to succeed. However, their efficiency suffered as they correctly solved the fewest problems per minute of work. Effort regulation analysis based on the Diminishing Criterion Model revealed distinct patterns: the Western participants invested the least amount of time regardless of item difficulty and the Israelis invested more time only when addressing the hardest items. The Chinese group allocated more time throughout but particularly in moderate to difficult items, hinting at their strategic determination to overcome the challenge. Understanding cultural differences in metacognitive processes carries implications for theory (e.g., motivational factors) and practice (e.g., international teams, education). The present findings can serve as a foundation for future research in these and other domains.

Corrosion Hazards in Urban Infrastructure Structures Using the Example of the Al Bayt Stadium in Katar

A significant aspect of corrosion failures and catastrophes originate from trivial mistakes in either the choice or connection of different materials, as well as from inaccurate evaluation of the compatibility between materials and the environment. The example shown in the present paper summarizes several wrong solutions due to a lack of knowledge of the basic rules of corrosion control. By chance, the consequences of these errors already appeared during construction; therefore, they were not able to cause damage during operation. This paper is the third in a series devoted to enhancing the need for professional corrosion control design for infrastructures.

Stabilized bi-cubic Hermite Bézier finite element method with application to gas-plasma interactions occurring during massive material injection in tokamaks

Development of a numerical tool based upon the high-order, high-resolution Galerkin finite element method (FEM) often encounters two challenges: First, the Galerkin FEMs give central approximations to the differential operators and their use in the simulation of the convection-dominated flows may lead to the dispersion errors yielding entirely wrong numerical solutions. Secondly, high-order, high-resolution numerical methods are known to produce high wave-number oscillations in the vicinity of shocks/discontinuities in the numerical solution adversely affecting the stability of the method. We present the stabilized finite element method for plasma fluid models to address the two challenges. The numerical stabilization is based on two strategies: Variational Multiscale (VMS) and the shock-capturing approach. The former strategy takes into account (the approximation of) the effect of the unresolved scales onto resolved scales to introduce upwinding in the Galerkin FEM. The latter adaptively adds the artificial viscosity only in the vicinity of shocks. These numerical stabilization strategies are applied to stabilize the bi-cubic Hermite Bézier FEM in the computational framework of the nonlinear magnetohydrodynamics (MHD) code JOREK. The application of the stabilized FEM to the challenging simulation of Shattered Pellet Injection (SPI) in JET-like plasma is presented. It is shown that the developed numerical stabilization model improves the stability of the underlying numerical algorithm and the computational cost required to reveal the complex physics is reduced. The physical and numerical models presented can be used to perform expensive simulations of the plasma applications in large computational domains such as JET, and ITER.

Learning-Assisted Inversion for Solving Nonlinear Inverse Scattering Problem

Solving inverse scattering problems (ISPs) is challenging because of its intrinsic ill-posedness and the nonlinearity. When dealing with highly nonlinear ISPs, i.e., those scatterers with high contrast and/or electrically large size, the traditional iterative nonlinear inversion methods converge slowly and take lots of computation time, even maybe trapped into local wrong solution. To alleviate the above challenges, a learning-assisted (LA) inversion approach termed as the LA inversion method (LAIM) with advanced generative adversarial network (GAN) in virtue of a new recently established contraction integral equation for inversion (CIE-I) is proposed to achieve a good balance between the computational efficiency and the accuracy of solving highly nonlinear ISPs. The preliminary profiles composed of only small amount of low-frequency components can be got efficiently by the Fourier bases expansion of CIE-I inversion (FBE-CIE-I). The physically exacted information can be taken as the input of the neural network to recover super-resolution image with more high-frequency components. A weighted loss function composed of the adversarial loss, mean absolute percentage error (MAPE), and structural similarity (SSIM) is used under the pix2pix GAN framework. In addition, the self-attention module is used at the end of the generator network to capture the physical distance information between two pixels and enhance the inversion accuracy of the feature scatterers. To further improve the inversion efficiency, the data-driven method (DDM) is used to achieve real-time imaging by cascading U-net and pix2pix GAN, where U-net is used to replace FBE-CIE-I in the LAIM. Compared with other LA inversion, both the synthetic and experimental examples have validated the merits of the proposed LAIM and DDM.

Lack of robustness and accuracy of many numerical schemes for phase-field simulations

In this paper, we study the stability, accuracy and convergence behavior of various numerical schemes for phase-field modeling through a simple ODE model. Both theoretical analysis and numerical experiments are carried out on this ODE model to demonstrate the limitation of most numerical schemes that have been used in practice. One main conclusion is that the first-order fully implicit scheme is the only robust algorithm for phase-field simulations while all other schemes (that have been analyzed) may have convergence issue if the time step size is not exceedingly small. More specifically, by rigorous analysis in most cases, we have the following conclusions: (i) The first-order fully implicit scheme converges to the correct steady state solution for all time step sizes. In the case of multiple solutions, one of the solution branches always converges to the correct steady state solution. (ii) The first-order convex splitting scheme, which is equivalent to the first-order fully implicit scheme with a different time scaling, always converges to the correct steady state solution but may seriously lack numerical accuracy for transient solutions. (iii) For the second-order fully implicit and convex splitting schemes, for any time step size [Formula: see text], there exists an initial condition [Formula: see text], with [Formula: see text], such that the numerical solution converges to the wrong steady state solution. (iv) For [Formula: see text], all second-order schemes studied in this paper converge to the correct steady state solution although severe numerical oscillations occur for most of them if the time step size is not sufficiently small. (v) An unconditionally energy-stable scheme (such as the modified Crank–Nicolson scheme) is not necessarily better than a conditionally energy-stable scheme (such as the Crank–Nicolson scheme). Most, if not all, of the above conclusions are expected to be true for more general Allen–Cahn and other phase-field models.

The New Solution Concept to Ill-Posed Bilevel Programming: Non-Antagonistic Pessimistic Solution

It is hardly realistic to assume that, under all decision circumstances, followers will always choose a solution that leads to the worst upper-level objective functional value. However, this generally accepted concept of the pessimistic solution to the ill-posed bilevel programming problems may lead to the leader’s attitude being more pessimistic vis à vis his anticipation of the follower’s decision being non-antagonistic. It will result in a wrong pessimistic solution and a greater potential of cooperation space between the leader and the followers. This paper presents a new concept of a non-antagonistic pessimistic solution with four numerical examples for bilevel programming problems from a non-antagonistic point of view. We prove that the objective function value of the non-antagonistic pessimistic solution generally dominates or is equal to the objective functional value of the pessimistic solution and the rewarding solution, and the maximum potential space for leader-follower cooperation can be overestimated in a generally applied pessimistic solution. Our research extends the concept of the pessimistic solution. It also sheds light on the insights that the non-antagonistic pessimistic solution can describe the practical potential of cooperation space between the leader and followers in non-antagonistic circumstances.

Euthanasia: a wrong solution to an unrecognized problem?

Organic Law 3/2021, of March 24, regulating euthanasia, has intensified a harsh debate. A priori, it is a conflict of bioethical values and a different anthropological vision between the different parties, however, we must not forget that perhaps before considering any debate, it is necessary to correctly interpret what the patient really wants when he states that he wants to die. In our health system and in our society, there are certain traits and needs of the person that are ignored, and that urgently require attention for the patient. Discovering the meaning of one's life, considering human transcendence, finding personal order and being able to experience love are vital elements of life, which at such a critical moment as high-grade suffering or imminent death, require all the attention of the health personnel. All this can contrast sharply with the values of our society, not dedicating adequate attention to it, among other reasons, due to the effort involved in carrying out comprehensive care of this type, thus making it much easier to carry out the procedures required by law regulation of euthanasia than addressing such intimate deficiencies of the being, despite the fact that these may be the real problem of the patient, who in his dramatic experience asks for help.

CONTRACT AS PROPERTY: TRIANGLES AND TRAGIC CHOICES

AbstractAccording to the “Inadequacy Thesis”, the law's refusal to extend the tort of conversion to interferences with contractual rights is evidence of systemic ossification and proof of its failure to protect the most valuable asset class in the modern economy. Whilst it is true that, like chattels, the benefit of contractual rights can be usurped by third parties, transforming such rights into objects of property is the wrong solution to the problem. This article departs from previous analyses by stressing that the analogue of acts of interference with contractual rights is not the conversion of a chattel but a “triangle dispute”. The problem raised by triangle disputes is not how to reach the primary wrongdoer, but how to allocate the loss between the innocent parties. Invoking the concept of “property” cannot solve this problem. Its efficient solution is to be found in better contracts, not more property.

«Птицы и ЛЭП» в России: наследие СССР, современные достижения и вопросы

«Птицы и ЛЭП» в России: наследие СССР, современные достижения и вопросы