Scipedia: Documents published in 2021

Micromechanical Interaction Model Accounting for the Spatial Distribution of Inclusions in Elastic-Viscoplastic Composites

Scipedia content — Wed, 01 Sep 2021 17:32:04 +0200

Multi-Scale Modelling of Heterogenous Textile Composite Structures over Polytopal Tessellated Domains

Scipedia content — Wed, 01 Sep 2021 17:31:18 +0200

Numerical Determination of the Effects of Out-of-Plane Waviness in Thermoplastic Matrix Laminates

Scipedia content — Wed, 01 Sep 2021 17:30:41 +0200

Homogenization of Fiber Reinforced Elastomer Laminates

Scipedia content — Wed, 01 Sep 2021 17:30:12 +0200

A Viscoelastic Cohesive Law for Rate and Temperature Dependent Mixed Mode Delamination

Scipedia content — Wed, 01 Sep 2021 17:29:40 +0200

Local Fibre Orientation and Fibre Volume Fraction Mapped Numerical Models Based on X-ray Computer Tomography Scans

Scipedia content — Wed, 01 Sep 2021 17:29:06 +0200

Quasi-Isotropic Carbon-Carbon Hybrid Laminate: Static and Low-Cyclic Performance

Scipedia content — Wed, 01 Sep 2021 17:27:34 +0200

Damage Modelling in Sublaminate Scale with Higuer Order Elements in Explicit Dynamics

Scipedia content — Wed, 01 Sep 2021 17:27:04 +0200

Early Stage Temperature Conditions Influence on Micromechanical Features of Thermoset Polymer-based Composite

Scipedia content — Wed, 01 Sep 2021 17:26:25 +0200

A Two-dimensional Numerical Strategy for Computing Self-healing Ceramic Matrix Composites Lifetime

Scipedia content — Wed, 01 Sep 2021 17:25:53 +0200

Numerical Analysis of Fatigue Damage Behavior in Fiber Composites under Different Block Loading Conditions

Scipedia content — Wed, 01 Sep 2021 17:25:21 +0200

A Mechanism-based Thermo-Viscoelastic Constitutive Law for Fiber Reinforced Polymer Matrix Composites

Scipedia content — Wed, 01 Sep 2021 17:24:03 +0200

Second-order Computational Homogenisation for Thick Shell Models: Application to Non-linear Multiscale Analysis of Composites

Scipedia content — Wed, 01 Sep 2021 17:23:23 +0200

Accelerating two-scale Simulations with a Non-intrusive Reduced Order Model

Scipedia content — Wed, 01 Sep 2021 17:22:31 +0200

Cohesive Zone Based Conformal Meshing and Damage Simulation of Yarn Contacts in Woven Composites

Scipedia content — Wed, 01 Sep 2021 17:21:53 +0200

Computation-Guided Multifunctional Design of Structural Battery Composites

Scipedia content — Wed, 01 Sep 2021 17:19:36 +0200

Numerical - Experimental Approach for the Correlation Structure Determination of Short Fiber Reinforced Structures

Scipedia content — Wed, 01 Sep 2021 17:18:55 +0200

Simulation Supported Development of Lightweight Panels with High Delamination Resistance

Scipedia content — Wed, 01 Sep 2021 17:18:13 +0200

Correlation Analysis of the Elasto-Plastic Behavior for Short Fiber-Reinforced Composites

Scipedia content — Wed, 01 Sep 2021 17:17:26 +0200

Methodology for Prediction of Transverse Crack Saturation Density and Diffuse Delamination Onset in Laminates

Scipedia content — Wed, 01 Sep 2021 17:13:56 +0200

Revised Boundary Conditions for FE-MD Multiscale Coupling of Amorphous Polymers

Scipedia content — Wed, 01 Sep 2021 17:13:26 +0200

Virtual Testing Integration and Material Allowables Generation

Scipedia content — Wed, 01 Sep 2021 17:12:47 +0200

Towards a Normative Protocol for Dynamic Shear Tests on [±45°] CMO Specimens: Geometry Validation

Scipedia content — Wed, 01 Sep 2021 17:12:11 +0200

Optimization of Thermoelastic Two-Phase Composites Using Analytical and Numerical Homogenization

Scipedia content — Wed, 01 Sep 2021 17:11:33 +0200

Scalable Localized Model Order Reduction Applied to Composite Aero-Structures

Scipedia content — Wed, 01 Sep 2021 17:10:49 +0200

An Interval-Based Approach for the Computation of Uncertainty in the Micromechanical Properties of Unidirectional Composite Materials

Scipedia content — Wed, 01 Sep 2021 17:10:14 +0200

Numerical Analisys of Guided Ultrasonic Wave Propagation in Fiber Metal Laminates

Scipedia content — Wed, 01 Sep 2021 17:09:27 +0200

Computational Modelling of Failure Mechanisms in Fibre Metal Laminates

Scipedia content — Wed, 01 Sep 2021 17:06:50 +0200

Comparison of Computational Techniques for Prediction of Delamination Initiation and Propagation in Composite Laminates

Scipedia content — Wed, 01 Sep 2021 17:00:53 +0200

Continuum Damage Micromechanics Model for the Compressive Failure of Flax Fiber Composites and Experimental Validation

Scipedia content — Wed, 01 Sep 2021 16:57:19 +0200

Mapping 3D Textiles onto their Models

Scipedia content — Wed, 01 Sep 2021 16:56:33 +0200

Damping in CFRP Structures: Modelling and Comparison of Technological Solutions Using Elastomer

Scipedia content — Wed, 01 Sep 2021 16:54:35 +0200

On the Numerical Modeling and Validation of Fracture Mechanics for Printed Electronics Composites.

Scipedia content — Wed, 01 Sep 2021 08:47:36 +0200

Multi-Scale Virtual Testing of an Automatic Fibre Placed Orthogrid Fuselage Panel

Scipedia content — Tue, 31 Aug 2021 16:40:55 +0200

Advanced isogeometric simulations of coupled problems

Scipedia content — Tue, 31 Aug 2021 10:44:42 +0200

Physics-based and data-driven hybrid modeling: when data enrich models and models render data smarter

Scipedia content — Tue, 31 Aug 2021 10:44:09 +0200

Partitioned Analysis: Advances during 2001-Present and Future Challenges

Scipedia content — Tue, 31 Aug 2021 10:43:03 +0200

Developments in additive manufacturing processes: industrial technologies and numerical analyses

Scipedia content — Tue, 31 Aug 2021 10:41:11 +0200

Model Selection and Coupling in the Context of Biomedical Device Design

Scipedia content — Tue, 31 Aug 2021 10:39:42 +0200

Multiscale multiphysiology predictive models of brain

Scipedia content — Tue, 31 Aug 2021 10:34:14 +0200

Microstructured porous material models for damage induced by fluids in compressed rocks

Scipedia content — Tue, 31 Aug 2021 10:32:24 +0200

The thick strip method for slender body fluid structure interaction

Scipedia content — Tue, 31 Aug 2021 08:56:21 +0200

Material Cost Optimization and Quality Control Improvement of Building Construction

Emer T. Quezon — Sun, 29 Aug 2021 21:45:02 +0200

A building construction project cannot be completed successfully by only planning and scheduling. Project controlling that consists of project monitoring and updating, is the other critical stage. Construction materials cost and quality are becoming a severe problem in Ethiopia, especially in Ambo Town, where little consideration is given. The study tried to evaluate different factors affecting the materials cost and quality on building construction site, rank significant factors that are prevalently affecting the cost and quality of materials used for building projects from the point of view of the respondents, and established a model to optimize materials cost and materials quality using multilinear regression method to come up with the model best fit. Purposive sampling was used, and 180 questionnaires were administered to building construction firms to analyze Material cost Optimization and quality control ImprovementCase Study of Ambo Town. To achieve this, a questionnaire survey containing factors affecting Building construction material cost and quality, which were identified by literature and Interview, was analyzed by using the Relative Importance Index, Pearson's correlation, and Multilinear regression model. Variables are statistically significant at 95% confidence level is assessed that all of the independent variables are positively related to Building Construction material cost and quality. The RII results showed that Material Wastage minimization (RII = 0.908), Proper workmanship (RII= 0.859), Sufficient Training of workers/staff (RII = 0.876), Proper forecasting of materials price in the market (RII = 0.850), Using suitable, safe and secure storage (RII = 0.886), Quality checking for each delivery of the aggregates to the site (RII = 0.889), Cutting of materials ( glass, tiles, plywood) (RII = 0.870) and Design changes (RII = 0.770) were ranked as the most significant among factors affecting building construction materials. Also, two Multiple linear regression models were established for both dependent variables (material cost and material quality). The analysis results showed all independent variables were significant and had a strong positive relationship with dependent variables. The values of R2 for the developed equations indicated 0.771 for material cost and 0.777 for material quality. Hence, the basic recommendations such as planning and monitoring construction activities and inspection and verification of materials were anticipated to be exercised by key role players of the construction industry.

A comprehensive review on structural joining techniques in the marine industries_July 2021 (IAMaC 2021)

Dominika Behrendt — Tue, 24 Aug 2021 11:02:02 +0200

Since many modules of a ship cannot be practically reduced to a single structure, joining technologies are employed to join various
substructures and transfer loads between the different components. These joining methods include welding, mechanical fastening, adhesive bonding, overlamination, and hybrid joining. In the current study, a comprehensive review has been conducted on the mechanical performance of the common joining techniques in the marine industry.

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101006860 (FIBRE4YARDS project).

A comprehensive review on structural joining techniques in the marine industries_July 2021 (AB 2021)

Dominika Behrendt — Tue, 24 Aug 2021 10:57:04 +0200

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101006860 (FIBRE4YARDS project).

Effect and suitability of calcined Montmorillonite clay powder and waste Khat Husk Ash in the Strength and Durability of C-25 concrete and it's Benefits Cost analysis

Gamachu Wakoya — Tue, 17 Aug 2021 19:12:55 +0200

Some environmental issues are industrial wastes and cement productions, which cause high gas emissions. Cement is vital in the global construction industry. The research goal was to find a cheaper material locally. Using OPC, calcined Montmorillonite clay powder (CMMT) and waste Khat Husk Ash (KHA) were tested as a partial replacement. Water entering the interlayer molecular spaces and adsorption, a material in expansive soil, causes Montmorillonite clay to expand more than other clays. Most of Ambo's land is expansive soil, from which samples were taken to determine Montmorillonite clay content. The average temperature required to calcine MMT clay was performed at 800℅ using a muffle furnace, ground to the fineness of 150μm, and its chemical composition was investigated. Similarly, the waste KH was heated at a temperature of 600℅
. The proportions by weight are applied for the OPC, Calcined MMT clay powder and Waste Khat Hush Ash as follows: Proportion-A (100%: 0%: 0%); P-B (85%:10%:5%); P-C (75%:20%:5%); P-D (65%:30%:5%); P-E (55%:40%:5%) and P-F (45%:50%:5%). The production of concrete for the C-25 Grade mix design was performed based on the ASTM manual, ERA manual, and the ACI code to evaluate the strengths and durability of concrete. These materials were calcined and then tested for strength and durability using ASTM C 618-5 to determine the chemical compounds at various temperatures. The experiments used aggregates up to 25mm in size. The results showed that when OPC was partially replaced with Calcined MMT clay powder and KHA, the consistency and setting time remained within the ASTM C-191 Standard Specifications. Moreover, the compressive, flexural, and split tensile strengths gradually decreased from the control specimen as the replacement was increased. The optimal amount of calcined MMT clay powder and Waste KHA indicated up to 15% by weight to replace OPC content in normal concrete mix production. The benefit cost analysis revealed that using OPC with calcined MMT clay powder and KHA is more cost-effective than using OPC alone.

The Russian Crisis Communication Response beyond MH17 Tragedy

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:51:02 +0200

Effective crisis communication response through using the proper strategies is critical to cope with crises and to protect the reputation and existence of the involved parties. Usually, aviation accidents receive great attention from the media and the public. Malaysia Airlines Flight 17 (MH17) which was shot down over eastern Ukraine on 17 July 2014 during its scheduled flight from Amsterdam to Kuala Lumpur received global attention. This attention was due to the involvement of several countries either at the level of the countries of victims or the countries accused of the attack. Image repair theory proposed by William Benoit, the widely used in crisis communication response was implemented in this study. The Russian response to the international accusation, especially from the Western world on supporting the attackers of MH17 has been examined in this study. This study implemented both quantitative and qualitative content analysis to achieve its aims. A total of 306 news stories from the online New Straits Times newspaper Website from the years 2014 to 2019 were analysed. A total of 191 strategies were included in 123 news stories since some stories combined more than a strategy. Out of 191 strategies, 43.5% were simple denial, followed by shift the blame and attack accuser with 35.1% and 21.5% respectively. The results revealed that the image repair effort by Russia was effective and successful.
Keywords: Crisis communication, image repair, MH17, response strategies, Russia

Newspaper advertising for public relations practitioners during the Malaya era 1957-1963

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:49:02 +0200

The very first recruitment for a public relations practitioner in Malaysia was encountered in 1948 and was advertised by the federal government of the British Colony in Malaya. This paper examines the subsequent advertisements after Malaya sought independence from the British colonial government. A total of eleven recruitment advertisements were found before the formation of Malaysia on the 16th September 1963. This paper outlines the advertisers, the titles of positions, as well as their qualifications and duties. The results show that the job requirement mainly came from the federal and local governments. Generally, the duties were related to information services and some specific responsibilities.
Keywords: public relations; advertising; Straits Times; Malaya

Indonesian Crisis Communication Response after Deliberate Forest Fires and Transboundary Haze

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:46:03 +0200

The issue of deliberate forest fires that set illegally in Indonesia by plantation companies in their slash and-burn forests to clear lands for lucrative palm oil plantations and its caused transboundary haze became a hot issue for discussion. These fires have a negative influence on Indonesia and its neighbourhood countries, especially on their financial and human resources such as environment, economy, properties, and people. Using the right strategies in responding to any crisis determines the success of its management and coping with that crisis with minimal losses. This study aimed to examine the communication crisis response by Indonesia to this crisis by using image repair theory. Also, this study examined how image repair strategies were used by Indonesia. This study analysed the content of news stories from the website of the New Straits Times newspaper. The time frame of this study was from 2015 to 2019. A total of 87 news stories have pertained to Indonesian response, and 37 stories included image repair strategies. Among the strategies of image repair theory, corrective action strategy was the most dominant with 70%, followed by 10.8% for each shift the blame and attack accuser. The least used strategies were mortification and simple denial with 5.4% and 2.7% respectively.
Keywords: Indonesia, crisis communication, image repair, transboundary haze, deliberate fires

Reliance, Media Exposure and Credibility

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:44:02 +0200

This study discusses credibility of both the traditional and social media from the audience perspective. Numerous definitions and conceptualisations of media credibility are either source or medium based but there are also numerous measurements made on the concept that gave rise to varied findings. An attempt was made to associate the concept of credibility with media exposure, postulating that the greater use of media would mean greater credibility. Two studies were made involving a total of 4095respondents with 1544 questionnaires distributed in April 2019, and 2551questionnaires in January 2018 to investigate the concept of credibility and its correlate with media use. The first period was before the General Elections but the April 2019 study was made after the May General Election giving an idea how credibility could have changed under a new government. The results of this study revealed that Malaysians perceived the traditional media, including TV, radio, and newspapers, were more credible than the new media (internet, online news portals, Facebook, and Twitter). TV was perceived to have the highest credibility, while Twitter, the lowest credibility. The social media suffered low credibility due to the surrounding discussions on fake news, false information, and post-truth issues. The sources of content in the traditional media are mostly known or verified, unlike that of the new media, thus paving for the poor evaluation of credibility of the new media.
Keywords: Media credibility, traditional media, new media, media exposure, Malaysia

Framing the First Palestinian General Elections by Malaysia’s New Straits Times

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:40:02 +0200

The main focus of this study is the coverage of New Straits Times (NST) of the first Palestinian General Elections for two presidential candidates namely, Yasser Arafat and Samiha Khalil. This study aimed to explore if any of Entman’s 1993 framing functions was used in the coverage of this issue and to explore whether the tone of NST coverage was negative, positive, balanced or neutral. To achieve the aims of this study, qualitative content analysis of elections stories from NST has been adopted. The number of news stories was eight, and the time frame started from 19th January to 13th February 1996, where three of these stories were published on the same day of 22nd January, two days after holding the elections on 20th January. Defining problems and diagnosing causes werethe most prominent of Entman’s four framing functions presented in all the articles. The moral judgment function was included in four news stories, and suggesting remedies was included in two news stories out of eight. The findings revealed that Yasser Arafat received 50% balanced coverage, followed by 37.5% positive coverage, and only 12.5% negative coverage, while Samiha Khalilreceived 67% balanced coverage, compared to 33% positive coverage.

Keywords: Arafat, framing, media coverage, Palestine, presidential elections

Exploring the Needs and Expectations of International Students towards The National University of Malaysia (UKM)

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:34:02 +0200

This study demonstrates main reasons for choosing The National University of Malaysia (UKM) by international students and their needs and expectations toward the University. The study also shows the obstacles faced by those students and their satisfaction towards UKM. A total of 108 questionnaires were distributed in the main campus to the respondents who came from ten diffident countries. The main reasons for choosing UKM were its high ranking, reasonable tuition fees, faculty, programmes, and lecturers respectively. The results revealed that the main obstacles faced international students were tough visa procedures, improper hostels, social isolation and discrimination, and bureaucracy. Both the facilities and services of UKM and the studying approach have met the expectations satisfaction of international students. Yet, both social relationship and participation in activities and living conditions in UKM hostels have disappointed international students and did not meet their satisfaction. This study suggested that UKM should establish counselling unit and organise regular meetings to listen to the problems and suggestions of those students. Volunteer and pre-enrolment activities should be organised to introduce the Malaysian culture and gather international students with their local peer. Moreover, international students should be provided upon their arrival to UKM by hostels that combine proper conditions of living at a reasonable price.

Keywords: international students, expectations, needs, satisfaction, internationalisation, intercultural communication

Framing the Reaction of President Abbas on the Issue of Moving the US Embassy from Tel Aviv to Jerusalem

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:25:02 +0200

The study has examined the similarities and differences in the coverage of two Palestinian news agencies Ma’an and Palestinian Information Center (PIC) on the reactions of Palestinian President Mahmoud Abbas’s regarding relocating the US embassy from Tel Aviv to Jerusalem. The study has also aimed to explore the use of four function of framing by Entman 1993 in the news stories of both agencies. Qualitative content analysis has been adopted to achieve the aim of this study. The total sampling number was 9 news stories; 3 stories have been retrieved from Ma’an, and the other 6 have been retrieved from PIC. The time frame has started from December 5, 2017 which marked the day of informing Abbas by Trump’s decision to move the Embassy until December 22 2017 which was a day after gaining a sweeping victory in UN by president Abbas through a resolution that rejected the decision. Both of the news agencies were supportive to President Abbas in their coverage and none of them has any negative coverage about him. From the sampling number it can be seen that PIC has paid more attention for the coverage of this issue than Ma’an. However, PIC has ignored the success of President Abbasfor achieving UN resolution against Trump’s decision. Moreover, all the news stories has included “define the problem” while excluded “diagnose causes” functions. However both“make moral judgment” and “suggest remedies” have been included in all news stories of Ma’an, and only half of news stories of PIC.
Keywords: Abbas, Trump, US embassy, Jerusalem, Palestine

Recruiting The Public Relations Officer During British Colonial Malaysia

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:23:02 +0200

This is a study on the growth of public relations in Malaysia based on the advertisements placed in the newspapers during the colonial period. Tracing the historical development serves to make a better understanding about the nature of public relations practice. This paper therefore aims at exploring the development of the public relations profession by studying the advertisements placed in the nationwide newspapers, the Straits Times and the Singapore Free Press & Mercantile Advertiser from 1939 which included the early advertisement that contained the phrase “public relations” to 1956 a year before the independence of the Federation of Malaysia. An analysis of the advertisements was made to fully understand the historical development of public relations in Malaya or then Malaysia.

Keywords: Public relations, public relations officer, recruiting, independence, Malaysia

Professional Values, Ethics, and Professionalism of Public Relations Practitioners

Mohammed Fadel Arandas — Sat, 14 Aug 2021 22:18:02 +0200

This study explores the influence of education, length of service, professionalism, and ethics on the professional values of public relations practitioners in Malaysia. A total of 427 questionnaires were distributed to public relations practitioners in Malaysia, and 322 questionnaires were returned. The study included 61% female respondents, and 39% male respondents. The study analyzed and identified the influence of professionalism and ethics on professional values of public relations practitioners. Additionally, the study examined whether education and experience influence professional values through professionalism, and code of ethics. Six hypotheses were tested to answer the research questions. The results from this study fully supported the hypotheses indicating that professionalism and ethics had an influence on professional values of public relations practitioners. The results also showed that education influenced both professionalism and ethics, and length of service influenced both professionalism and ethical practice.

Keywords: Professional values, public relations, practitioners, professionalism, code of ethics

A data-driven methodology for enhanced measurement and verification of energy efficiency savings in commercial buildings

Benedetto Grillone — Sat, 14 Aug 2021 13:11:02 +0200

Methods to obtain accurate estimations of the savings generated by building energy efficiency interventions are a topic of great importance, and considered to be one of the keys to increase capital investments in energy conservation strategies worldwide. In this study, a novel data-driven methodology is proposed for the measurement and verification of energy efficiency savings, with special focus on commercial buildings and facilities. The presented approach involves building use characterization by means of a clustering technique that allows to extract typical consumption profile patterns. These are then used, in combination with an innovative technique to evaluate the building’s weather dependency, to design a model able to provide accurate dynamic estimations of the achieved energy savings. The method was tested on synthetic datasets generated using the building energy simulation software EnergyPlus, as well as on monitoring data from real-world buildings. The results obtained with the proposed methodology were compared with the ones provided by applying the time-of-week-and-temperature (TOWT) model, showing up to 10% CV(RMSE) improvement, depending on the case in analysis. Furthermore, a comparison with the deterministic results provided by EnergyPlus showed that the median estimated savings error was always lower than 3% of the total reporting period consumption, with similar accuracy retained even when reducing the total training data available.

Assessment on Materials Quality Control Implementation of Building Construction Projects and Workmanship: A Case Study of Ambo University

Emer T. Quezon — Sun, 08 Aug 2021 19:22:02 +0200

Quality of material issues have been a significant source of concern since the dawn of recorded history. Building materials are essential and should be performed according to standard specifications because they cover around 60% of the project cost. Prior to project construction, specific codes, standards, and specifications should be available. Using all required materials does not guarantee a sound building appearance or function. Even with suitable materials, workmanship, and supervision, unexpected output can affect a building. Quality workmanship is a comprehensive approach to bolstering building durability, serviceability, and safety. The study evaluated Ambo University's building construction materials and quality. Convenience and quota sampling techniques were collected from all contractors and consultants involved in building construction via questionnaires and interviews. A comprehensive literature review identified 15 major factors affecting building construction materials quality and workmanship, and respondents ranked them in the order of importance. Defects in existing buildings and ongoing projects had observed due to non-compliance with construction materials and workmanship based on specifications and standards. The results indicated that Ambo University building has no defect-free structure, including the degree and type of defects vary. A 94% of the studied buildings had moisture leakage, plastering defects, paint peeling, and cracks. Hence, the consultants and Ambo University project representatives should adhere with the standard specifications, and must exercise their profession according to the ethical code of conduct. All of these, it will play a vital role in the success of construction projects.

Analysis of structure and starting characteristics of three-shaft ring-plate permanent magnet gear

Dongning Liu — Mon, 02 Aug 2021 05:17:17 +0200

Combined with the transmission mode of cycloid permanent magnet gear and ring plate mechanical gear, a three-shaft ring-plate permanent magnet gear transmission structure (TRMG) is proposed. Operating mechanism of structure is given. TRMG simulation model is established and the correctness is verified by transient finite element method. Based on momentum moment theorem, TRMG start-up process and start-up position of are analyzed theoretically. By calculating TRMG torque impulse, the optimal start-up range and start-up position of TRMG are determined.

Redirecting the design of an electrical engineering educational game to other disciplines

Sergio Rivera — Sat, 24 Jul 2021 20:16:03 +0200

This document describes the process of developing a game that simulates the fundamental aspects of a commercial establishment in charge of marketing and performing maintenance on electric motors, aimed mainly at Electrical Engineering students. The process begins with the coding of a software capable of simulating daily machinery buying and selling events, then its design was refined, including other elements that enrich the user experience. With these elements, you can make add-ons that allow you to simulate and document events in such a way that they can be used outside of your initial target audience.

Python notebook usefullness, case study: Optimization techniques course

Sergio Rivera — Fri, 23 Jul 2021 23:44:02 +0200

Online code sharing and documentation platforms have become an essential part of every analyst and data scientist’s lives. Google Colab and Jupyter Notebook are some of the well named platforms which are used quite extensively to work on datasets. These platforms allow the user to showcase and manipulate data along with the capabilities of adding beautiful visualizations and essential narrative texts. They offer high customization abilities for the users along with Collaboration and sharing capabilities. These notebooks also offer a variety of languages to choose from, like R, Python, PySpark etc. if the necessary packages are installed. Other platforms available for working on big data includes R Markdown, Kaggle, Spark Notebook and many other popular tools. With the recent developments in Data Science technologies and Machine learning, there has been an increased adoption for these platforms, which has eventually led to the addition of new features to these tools.

JupyterLab is a web-based interactive development environment for Jupyter Notebook, codes as well as data. It has been designed to be flexible so as to incorporate any form of workflow into it pertaining to Data Science, Scientific Computing as well as Machine Learning & Artificial Intelligence. It also allows developers to write their own plugins and packages, which can then be easily incorporated into the workflows, i.e., seamless integration experience. Jupyter Notebook is a component of Lab which is an open-source web application that allows users to create and share documents containing live code, equations, visualizations and narrative text. Some of the use cases include data cleaning and transformation, numerical simulation, statistical modeling, and data visualization.

Google Colab or short for Colaboratory is a product developed by Google Research, which is a free to use platform and can be used to execute arbitrary Python codes through the browser. This tool is especially suited for machine learning, data analysis as well as educational purposes. Colab is a hosted Jupyter Notebook service which requires no setup and provides free access to computing power like GPUs on the cloud. This is ofcourse extended if the user pays for the pro version called Colab Pro.

Stackelberg game approach to a bi-objective robust design optimization

Sangmun Shin — Fri, 23 Jul 2021 11:49:04 +0200

Robust design has received a great deal of attention from quality researchers in recent years, and a number of optimization methodologies based on the dual response format have been proposed. The majority of existing bi-objective optimization models concentrate on the trade-offs between the process mean and variability functions without investigating the interactions between control factors and quality characteristics. The primary objective of this research is to integrate the Stackelberg leadership model into the robust design procedure and propose a Stackelberg game-based robust design (SGRD) method to determine appropriate control factor settings by minimizing the values of desired optimization targets based on an analysis of possible combinations of input and output quality parameters. Herein, first, a bi-objective robust design optimization problem is formulated as a dual response model using response surface methodology (RSM). Second, the proposed SGRD model is developed via decomposition into two leader-follower game models. Finally, the mean square error (MSE) criterion is applied to evaluate models, and select non-dominated solutions in various situations. Numerical examples are used to demonstrate that the proposed method provides significant solutions in cases containing unidentified priorities between the dual responses and undiscovered correlations among several inputs and outcomes. In addition, according to the case study analysis, the proposed method is more efficient than the conventional dual response approach when dealing with bi-objective robust design optimization problems.

Seakeeping analysis of monohull ships at preliminary design using artificial neural networks

José Enrique Gutiérrez Romero — Tue, 20 Jul 2021 15:09:02 +0200

Nowadays seakeeping is mostly analysed by means of model testing or numerical models. Both require of a significant amount of time and of the exact hull geometry, and this is why seakeeping is not taken into account at the early stages of ship design. Then, the main objective of this work is the development of a seakeeping prediction tool to be used in the early design. Hence this tool must be fast, accurate, and must not require the exact hull shape. To this end, an artificial intelligence (AI) algorithm has been developed. This algorithm is based on artificial neural networks (ANN) and only requires the ship coefficients of forms.

The methodology developed to obtain the predictive algorithm is presented as well as the database of ships used for training the ANN. The training data were generated using a seakeeping code based on the boundary element method (BEM). Also, the AI predictions are compared to the BEM results using both, ship shapes from the training database and from outside.

As a result it has been obtained an AI tool capable of predicting seakeeping almost instantly for a wide range of monohull merchant ships. And the difference in results, with respect to the BEM code used for the training, is lower than 5%.

Research on missile consumption in wartime with the airport runway as the target

Qiaoyang Li — Tue, 20 Jul 2021 10:41:48 +0200

To solve the problem of insufficient research on missile consumption in wartime with the airport runway as the target, this paper takes the airport runway as the target, taking the invalidation probability as the expected target, and adopting conventional missiles with submunitions. In combination with penetration and anti-missile countermeasures, this paper publicly proposes the consumption calculation method and model for the first time, and the multi-wave strikes strategy and calculation method are proposed either. The model is verified by combining the specific airport runway, fighter jet model and missile parameters. The experiment calculates the total consumption and the corresponding probability of destroying the target, as well as the total strike wave and the corresponding probability of destroying the target. The results prove the effectiveness and accuracy of the method and model, and provide an important basis for the sufficient amount of missiles to attack airport runways in wartime.

An Introduction to FIBREGY Project

Jesús Sánchez Pinedo — Tue, 13 Jul 2021 10:10:49 +0200