1,720,960 research outputs found
Reliability Benchmarking of Eurocode 7 Design Examples: CIE5050-09: Additional Thesis Project 2021
No full textThe application of reliability analysis in geotechnical engineering is relatively new compared to the other sections of civil engineering such as structural engineering and hydraulic engineering. However, due to its increases use in recent years, reliability analysis is planned to be included extensively in the upcoming Eurocode 7 (EN 1997). This research aims to compare the accuracy and efficiency between the applications of 22 selected reliability methods in 9 selected geotechnical engineering problems with various number of independent variables and modes of failure. The accuracy of the reliability methods are determined based on the Probability of Failure (Pf) errors, while the efficiency is based on the number of realizations (N) each method needs. The Monte Carlo Simulation is found to be the most accurate method despite its shortcomings in efficiency (ranked as the least efficient). Moreover, the FOSM method is found to be the most efficient despite its serious shortcoming in accuracy where it is also ranked as the most inaccurate. However, putting both accuracy and efficiency into account, the AK-MCS 0 order is proven to be the best method when applied to the discussed geotechnical engineering problems. The research also points out the necessity to perform multiple reliability methods for each geotechnical engineering problem.Geo-Engineerin
A Reliability-Based Design Optimization Method for Geotechnical Engineering Problem Based On Active-Learning Kriging Metamodeling
No full textUsing an expensive-to-evaluate numerical model, such as a finite element method (FEM) model, is deemed unavoidable in solving modern geotechnical engineering problems. At the same time, the application of reliability analysis in dealing with uncertainties (e.g. soil properties) is increasing rapidly. This could pose a time-wise problem for an FEM model since reliability analysis normally takes much more than only one realization (function call) of the model. It becomes a bigger problem when a design optimization process is taking place. More often than not, design optimization is performed by a ”trial-and-error” method in practice, which the process itself would even take longer just to give engineers the ”sense” of achieving an optimal design (in terms of safety and economy). Therefore, the actual optimality of the design is not systematically proven and quantified. This research proposes a novel reliability-based design optimization (RBDO) method by combining existing theories regarding active-learning Kriging-based Monte Carlo Simulation (AK-MCS) and (1+1)-Covariance Matrix Adaptation evolution scheme ((1+1)-CMA-ES). To achieve accuracy and efficiency, the method consists of four enrichment stages. These enrichment stages ensure the method accurately and efficiently predicts the optimal design combination by considering the reliability constraint. The chosen case study is the reinforcement design of the Starnmeer polder dyke in the Netherlands, which is simulated as an FEM model. Within a limited number of function calls, the proposed RBDO method could accurately predict the optimal dimensions of the dyke that delivers the targeted reliability index. The reliable performance of the proposed method is further demonstrated by solving three analytical optimization problems.Geo-Engineerin
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
House Prices Prediction : Multiple Linear Regression vs Ridge vs Polynomial
Get PDFAbstractThe phenomenon of falling or rising house prices has attracted the interest of researchers as well as many other interested parties. The house not only be used as a place to live, it is also used as an investment instrument. Errors in determining the price of the house can result in losses. However, with data from developers, machine learning models can be applied for price predictive analysis. Several methods are used such as multiple linear regression, ridge, and polynomial. Model performance was measured using evaluation matrices such as Mean Squared Error (MSE), Root Mean Squared Error (RMSE), and also Mean Absolute Error (MAE). Multiple linear regression models yielding values of 0.0952, 0.3086, 0.2452, ridge yielding values of 0.0952, 0.3086, 0.2453, and polynomial yielding values of 0.0874, 0.2955, 0.2344. These results prove that the polynomial regression model with a value of degree = 2, coupled with a regularization technique using ridge regression with a value of Alpha = 100 can produces the best performance judging from the value of the error matrix it produces, the model will also be used to predict house prices in a web-based applications.Keywords: Multiple Linear Regression, Ridge Regression, Polynomial RegressionAbstrakFenomena turun atau naiknya harga rumah telah menarik minat dari peneliti juga banyak pihak lain yang berkepentingan. Rumah tidak hanya dijadikan sebagai tempat tinggal, rumah juga digunakan sebagai instrumen investasi. Kesalahan menentukan harga rumah dapat mengakibatkan kerugian. Namun, dengan adanya data – data dari pengembang, pembuatan model machine learning dapat diaplikasikan guna keperluan analisis prediktif harga. Beberapa metode yang digunakan seperti regresi linear berganda, ridge, dan polinomial. Performa model diukur menggunakan matriks evaluasi seperti Mean Squared Error (MSE), Root Mean Squared Error (RMSE), dan juga Mean Absolute Error (MAE). Model regresi linear berganda menghasilkan nilai 0.0952, 0.3086, 0.2452, ridge menghasilkan nilai 0.0952, 0.3086, 0.2453, dan polinomial menghasilkan nilai 0.0874, 0.2955, 0.2344. Hasil tersebut membuktikan bahwa model regresi polinomial dengan nilai degree = 2, ditambah dengan teknik regularisasi regresi ridge dengan nilai Alpha = 100 dapat menghasilkan performansi terbaik dilhat dari nilai matriks error yang dihasilkannya, model tersebut juga akan digunakan untuk melakukan prediksi harga rumah pada aplikasi yang berbasis website.Kata kunci: Regresi Linear Berganda, Regresi Ridge, Regresi PolinomialÂ
IMPACT OF 5S ON BUSINESS PERFORMANCE THROUGH LEAN MANAGEMENT AND BLUE OCEAN LADERSHIP IN THE INDONESIAN MANUFACTURING INDUSTRY
Get PDFBusiness competition in the manufacturing sector is increasingly high and unpredictable. Tight investment in capital and human resources requires companies to ensure 5S practices, the basic concepts of Japanese culture and lean management need to be applied to improve business performance in Indonesia, especially at PT. Manufacturing. This research uses a PLS-SEM approach. A total of 85 respondents were in division head positions. The research results show that 5S has no direct or indirect influence on business performance. The results show that lean management and blue ocean leadership do not have a mediating effect between 5S and business performance. Blue ocean leadership has not been implemented optimally by the leadership, so performance has not met expectations. Contribution of researchers to PT. Manufacturing helps top management in companies implement and execute 5S well in the company. The second contribution concerns the need to improve lean management in the pull system.
Persaingan bisnis di sektor manufaktur semakin tinggi dan tidak dapat diprediksi. Investasi yang ketat pada modal dan sumber daya manusia mengharuskan perusahaan untuk memastikan praktik 5S, konsep dasar budaya Jepang dan lean manajemen perlu diterapkan untuk meningkatkan kinerja bisnis di Indonesia khususnya di PT. Manufaktur. Penelitian ini menggunakan pendekatan PLS-SEM. Sebanyak 85 responden menduduki posisi kepala divisi. Hasil penelitian menunjukkan bahwa 5S tidak mempunyai pengaruh langsung maupun tidak langsung terhadap kinerja bisnis. Hasil penelitian menunjukkan bahwa lean manajemen dan blue ocean leadership tidak mempunyai efek mediasi antara 5S dan kinerja bisnis. Blue ocean leadership belum diterapkan secara maksimal oleh pimpinan sehingga kinerja belum sesuai harapan. Kontribusi Peneliti pada PT. Manufaktur membantu manajemen puncak di perusahaan menerapkan dan mengeksekusi 5S dengan baik di perusahaan. Kontribusi kedua menyangkut kebutuhan untuk meningkatkan manajemen lean dalam pull system
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
