International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Sustainability of Solid Waste Management System in Urban Areas of Pakistan: S...IJERA Editor
This document discusses a study on stakeholders' perspectives on the sustainability of solid waste management systems in urban areas of Pakistan. Five components of sustainable solid waste management systems were identified: technical, environmental, economic, social, and institutional. Stakeholders were classified into technical and social groups and surveyed to determine the relative importance of the five components using analytical hierarchy process, a multi-criteria decision analysis tool. The study found that environmental components were the highest priority for technical stakeholders, while social components were the highest priority for social stakeholders. The results provide input to improve sustainability of solid waste management systems.
Life Cycle Assessment of Power Utility Poles – A Reviewinventionjournals
Worldwide, overhead electricity distribution is performed using poles made from various materials. The choice of the most efficient pole material is based on management strategies that integrate concerns for environmental sustainability. By quantifying environmental impacts of products, life cycle assessment (LCA) is a tool which can be very useful to decision-makers. But how, where and to which extent has it been applied to power utility poles until now, and which accomplishments and challenges can be pointed out from the findings of these LCA applications? To address these questions, a review of accessible published LCA studies of power utility poles has been carried out. By employing well established literature review methodologies, a computer search of journals, conference proceedings, and reports have been carried out and retrieved case studies have been analyzed according to the criteria derived from the four phases of LCA international standards. From a performed review process, it was realized that a total of 13 LCA case studies have been increasingly conducted during these last 26 years in only four countries around the world. The case studies included both comparative LCA of various pole materials and LCA of a single pole material. The main used utility pole materials, the main considered functional units, the main assessed impact categories, the most considered environmentally friendly pole material, and the main challenges in the field have been identified and documented. LCA constitute a useful research field when studying the sustainability of power utility poles. Although existing case studies are scarce, the review highlights several outstanding accomplishments which show what have been satisfactorily done and what needs to be done. Currently, the topic is mainly limited to USA and Swedish researchers; developing countries seem to have noting to do with and there is not yet a methodological consensus which could facilitate a deep comparison between published case studies.
This document summarizes a research paper that uses multiple criteria decision analysis to evaluate hazardous waste management in the United States. It applies a hybrid DEA-TOPSIS method, which uses data envelopment analysis and the technique for order preference by similarity to ideal solution. The researchers collected data on hazardous waste generation, treatment, and facilities from the Environmental Protection Agency. They then analyzed the data using the DEA-TOPSIS method to determine which states manage hazardous waste most effectively and which need improvement, in order to help the EPA enhance hazardous waste management nationwide.
1. The document discusses several topics related to environmental training including life cycle assessment (LCA), ecological footprint, environmental impact assessment (EIA), strategic environmental assessment (SEA), multi-criteria analysis (MCA), climate resilient infrastructure development, and gender analysis matrix.
2. Multi-criteria analysis is introduced as a decision-making tool for complex problems that allows multiple criteria to be considered. It provides a structured way to incorporate expert judgement and stakeholder preferences.
3. Climate resilient infrastructure is defined as infrastructure planned and designed to withstand, respond to, and recover from impacts of climate change. Examples of structural and management adaptation measures are given.
This document proposes a conceptual framework to support open and participatory State of the Environment and Sustainability (SoES) reports. The framework aims to improve these reports by actively involving stakeholders throughout the reporting process, from design to production and review. Currently, stakeholder involvement in SoES reports is usually limited to consultation. The proposed framework structures the reporting process into phases, identifies methods for obtaining informal stakeholder data, and considers how to organize the internal structure and spatial scope of the report. It argues that an open participatory approach involving stakeholders as volunteer reporting staff could effectively contribute to assessments and produce a higher quality collaborative report.
This document discusses a study on the effect of cement combinations containing Portland cement, fly ash, silica fume, and metakaolin on the plastic density and workability of concrete. The results show that cement additions reduce the plastic density of concrete as the content increases. Fly ash concrete had lower plastic densities than silica fume and metakaolin concrete. At replacement levels below 55%, all cement combination concretes achieved plastic densities between 2350-2450 kg/m3. Fly ash reduced and silica fume and metakaolin increased superplasticiser dosage requirements. Metakaolin concrete required higher dosages than silica fume concrete. Cement additions improved cohesion but caused stickiness at higher pozz
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Sustainability of Solid Waste Management System in Urban Areas of Pakistan: S...IJERA Editor
This document discusses a study on stakeholders' perspectives on the sustainability of solid waste management systems in urban areas of Pakistan. Five components of sustainable solid waste management systems were identified: technical, environmental, economic, social, and institutional. Stakeholders were classified into technical and social groups and surveyed to determine the relative importance of the five components using analytical hierarchy process, a multi-criteria decision analysis tool. The study found that environmental components were the highest priority for technical stakeholders, while social components were the highest priority for social stakeholders. The results provide input to improve sustainability of solid waste management systems.
Life Cycle Assessment of Power Utility Poles – A Reviewinventionjournals
Worldwide, overhead electricity distribution is performed using poles made from various materials. The choice of the most efficient pole material is based on management strategies that integrate concerns for environmental sustainability. By quantifying environmental impacts of products, life cycle assessment (LCA) is a tool which can be very useful to decision-makers. But how, where and to which extent has it been applied to power utility poles until now, and which accomplishments and challenges can be pointed out from the findings of these LCA applications? To address these questions, a review of accessible published LCA studies of power utility poles has been carried out. By employing well established literature review methodologies, a computer search of journals, conference proceedings, and reports have been carried out and retrieved case studies have been analyzed according to the criteria derived from the four phases of LCA international standards. From a performed review process, it was realized that a total of 13 LCA case studies have been increasingly conducted during these last 26 years in only four countries around the world. The case studies included both comparative LCA of various pole materials and LCA of a single pole material. The main used utility pole materials, the main considered functional units, the main assessed impact categories, the most considered environmentally friendly pole material, and the main challenges in the field have been identified and documented. LCA constitute a useful research field when studying the sustainability of power utility poles. Although existing case studies are scarce, the review highlights several outstanding accomplishments which show what have been satisfactorily done and what needs to be done. Currently, the topic is mainly limited to USA and Swedish researchers; developing countries seem to have noting to do with and there is not yet a methodological consensus which could facilitate a deep comparison between published case studies.
This document summarizes a research paper that uses multiple criteria decision analysis to evaluate hazardous waste management in the United States. It applies a hybrid DEA-TOPSIS method, which uses data envelopment analysis and the technique for order preference by similarity to ideal solution. The researchers collected data on hazardous waste generation, treatment, and facilities from the Environmental Protection Agency. They then analyzed the data using the DEA-TOPSIS method to determine which states manage hazardous waste most effectively and which need improvement, in order to help the EPA enhance hazardous waste management nationwide.
1. The document discusses several topics related to environmental training including life cycle assessment (LCA), ecological footprint, environmental impact assessment (EIA), strategic environmental assessment (SEA), multi-criteria analysis (MCA), climate resilient infrastructure development, and gender analysis matrix.
2. Multi-criteria analysis is introduced as a decision-making tool for complex problems that allows multiple criteria to be considered. It provides a structured way to incorporate expert judgement and stakeholder preferences.
3. Climate resilient infrastructure is defined as infrastructure planned and designed to withstand, respond to, and recover from impacts of climate change. Examples of structural and management adaptation measures are given.
This document proposes a conceptual framework to support open and participatory State of the Environment and Sustainability (SoES) reports. The framework aims to improve these reports by actively involving stakeholders throughout the reporting process, from design to production and review. Currently, stakeholder involvement in SoES reports is usually limited to consultation. The proposed framework structures the reporting process into phases, identifies methods for obtaining informal stakeholder data, and considers how to organize the internal structure and spatial scope of the report. It argues that an open participatory approach involving stakeholders as volunteer reporting staff could effectively contribute to assessments and produce a higher quality collaborative report.
This document discusses a study on the effect of cement combinations containing Portland cement, fly ash, silica fume, and metakaolin on the plastic density and workability of concrete. The results show that cement additions reduce the plastic density of concrete as the content increases. Fly ash concrete had lower plastic densities than silica fume and metakaolin concrete. At replacement levels below 55%, all cement combination concretes achieved plastic densities between 2350-2450 kg/m3. Fly ash reduced and silica fume and metakaolin increased superplasticiser dosage requirements. Metakaolin concrete required higher dosages than silica fume concrete. Cement additions improved cohesion but caused stickiness at higher pozz
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The document describes a proposed method for extracting captions from videos. It involves three main steps: 1) Caption detection uses a stroke filter to identify stroke-like edges in captions, filtering out edges from complex backgrounds. 2) Caption localization spatially localizes captions in each video frame using an SVM classifier and temporally localizes captions appearing across multiple frames. 3) Caption segmentation separates caption pixels from background pixels. The proposed method aims to improve efficiency and accuracy over previous methods by considering temporal features to avoid extracting the same caption repeatedly.
This document compares different 16x16 and 4x4 multipliers based on the modified Booth algorithm. It discusses the general structure of multipliers including Booth encoding, partial product compression using adders like carry save adders and Kogge-Stone adders, and final addition. The document implements various multipliers in Verilog and compares their performance in terms of hardware resources and delay. It finds that radix-4 Booth encoding provides faster multipliers than radix-2 with similar power consumption and that Kogge-Stone adders provide faster addition than carry save adders.
This document discusses a study of fluid flow behavior under different gases and flow rates during gas metal arc welding (GMAW). An analytical model was developed to estimate fluid flow in GMAW torch nozzles under varying shielding gases (100% CO2, 100% Ar, 80% Ar/20% CO2) and gas flow rates. Experiments evaluated the model's predictions of fluid behavior and weld quality at different flow rates. Results show that with CO2, turbulence occurs over 35 L/min, while with Ar and the Ar/CO2 blend, turbulence is seen above 70 L/min. Maintaining flow rates below these thresholds is recommended for effective shielding during GMAW. The model provides a way
This document investigates the bit error rate (BER) performance of MIMO systems with different numbers of transmitting antennas. It begins with an introduction to fading in wireless channels and how MIMO can be used to combat it using multiple antennas. It then describes the Alamouti space-time coding scheme and how maximum likelihood decoding works. Simulations are presented comparing the BER of a BPSK modulated MIMO system with 2, 3, and 4 transmitting antennas under Rayleigh fading. The results show that increasing the number of transmitting antennas decreases the BER, with 4 antennas performing best due to a larger transmission matrix and more data being transmitted.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This paper presents a machine translation system that translates simple assertive English sentences to Marathi sentences. The system performs morphological analysis, part-of-speech tagging, and local word grouping to convert the meaning of the English sentence to the corresponding Marathi sentence. An English to Marathi bilingual dictionary is used for translation. The system aims to help people with primary education understand English words by providing translations to their native Marathi language.
This document summarizes two common non-invasive methods for measuring blood pressure: the auscultatory (Korotkoff) method and the oscillometric method. It provides a brief history of blood pressure measurement, from early invasive methods to the development of the cuff-based methods still used today. For the auscultatory method, it describes listening for Korotkoff sounds with a stethoscope as the cuff deflates and how different phases correlate with systolic and diastolic pressure. For the oscillometric method, it outlines how cuff pressure oscillations relate to blood pressure values. The document aims to review these two primary cuff-based techniques for spot blood pressure measurement.
1) The document studies the buckling behavior of fiber-reinforced plastic corrugated-core sandwich plates with different corrugation shapes and thicknesses under uni-axial compression.
2) Testing showed that for all sandwich panels, the failure mechanism was first face sheet delamination followed by core shear failure. Higher strain rates led to more foam core remaining on the face sheets after failure.
3) While sinusoidal corrugated cores showed very high buckling strengths, all corrugated core sandwich panels demonstrated increased wrinkling strength over uncorrugated designs.
Este documento contiene en análisis sintáctico de varias oraciones complejas que contienen subordinadas de distintos tipos, todas ellas encabezadas por la partícula "que". En unos casos se trata de oraciones completivas (tradicionalmente llamadas subordinadas sustantivas) y en otros, de oraciones de relativo, con o sin antecedente. Se utiliza un sistema de representación gráfica en árbol.
Este documento describe los principales géneros periodísticos de información, interpretación y opinión. Explica que la información transmite hechos de forma objetiva, la interpretación incluye el punto de vista del autor, y la opinión transmite la postura subjetiva del autor. También analiza si la prensa debe limitarse a informar objetivamente o puede influir en la opinión, y muestra ejemplos de portadas de periódicos antes de proponer un ejercicio de redacción.
This document provides a summary of offers and promotions for March 2014 from The Chemists India Trusts. It includes mega offers from GNC with discounts of 25-30% on products. There are also bundle offers, discounts of 10% on selected Guardian products, and other offers with price reductions on books, supplements, and soap gift packs. Focus categories for the month are feminine hygiene, baby care, and immunity products. The document outlines alliances with Jet Airways, Citibank, ICICI Bank, FreeCharge, American Express, and SBI Credit Card that provide additional discounts. It introduces new Guardian product launches and recommends placements of Guardian stands and the Choose & Save stand in stores. Finally, it highlights the Q
El documento describe las características del emprendimiento y la cultura emprendedora. Señala que el emprendimiento implica iniciar proyectos de manera constante y formar sueños de a poco, empezando con poco para lograr mucho. Además, define la cultura como tener lógica y saber hacer bien las cosas a través del pensamiento humano. Por último, destaca que un emprendedor es alguien motivado que vence cualquier obstáculo para alcanzar sus sueños a través de la lucha y el aprendizaje constante.
This document discusses eco-efficiency assessment models and presents a methodology for selecting the appropriate model. It begins with an introduction to eco-efficiency and a literature review that identified 40 articles describing eco-efficiency assessment models. The document then proposes an Analytic Hierarchy Process (AHP)-based procedure for choosing the best model for a given application based on predefined criteria. It applies the AHP methodology to a numerical example to demonstrate how to implement the selection process.
The document discusses different types of matrices used in environmental impact assessments to identify interactions between project activities and environmental factors. It describes simple matrices, stepped matrices, and weighted matrices. Simple matrices cross-reference project phases with environmental elements and can use symbols to show impact scale. Stepped matrices consider how activities relate to resources and how one action's impacts can affect other resources. Weighted matrices allow ranking impacts by assigning weights to environmental components and scoring project impacts.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The document describes a proposed method for extracting captions from videos. It involves three main steps: 1) Caption detection uses a stroke filter to identify stroke-like edges in captions, filtering out edges from complex backgrounds. 2) Caption localization spatially localizes captions in each video frame using an SVM classifier and temporally localizes captions appearing across multiple frames. 3) Caption segmentation separates caption pixels from background pixels. The proposed method aims to improve efficiency and accuracy over previous methods by considering temporal features to avoid extracting the same caption repeatedly.
This document compares different 16x16 and 4x4 multipliers based on the modified Booth algorithm. It discusses the general structure of multipliers including Booth encoding, partial product compression using adders like carry save adders and Kogge-Stone adders, and final addition. The document implements various multipliers in Verilog and compares their performance in terms of hardware resources and delay. It finds that radix-4 Booth encoding provides faster multipliers than radix-2 with similar power consumption and that Kogge-Stone adders provide faster addition than carry save adders.
This document discusses a study of fluid flow behavior under different gases and flow rates during gas metal arc welding (GMAW). An analytical model was developed to estimate fluid flow in GMAW torch nozzles under varying shielding gases (100% CO2, 100% Ar, 80% Ar/20% CO2) and gas flow rates. Experiments evaluated the model's predictions of fluid behavior and weld quality at different flow rates. Results show that with CO2, turbulence occurs over 35 L/min, while with Ar and the Ar/CO2 blend, turbulence is seen above 70 L/min. Maintaining flow rates below these thresholds is recommended for effective shielding during GMAW. The model provides a way
This document investigates the bit error rate (BER) performance of MIMO systems with different numbers of transmitting antennas. It begins with an introduction to fading in wireless channels and how MIMO can be used to combat it using multiple antennas. It then describes the Alamouti space-time coding scheme and how maximum likelihood decoding works. Simulations are presented comparing the BER of a BPSK modulated MIMO system with 2, 3, and 4 transmitting antennas under Rayleigh fading. The results show that increasing the number of transmitting antennas decreases the BER, with 4 antennas performing best due to a larger transmission matrix and more data being transmitted.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This paper presents a machine translation system that translates simple assertive English sentences to Marathi sentences. The system performs morphological analysis, part-of-speech tagging, and local word grouping to convert the meaning of the English sentence to the corresponding Marathi sentence. An English to Marathi bilingual dictionary is used for translation. The system aims to help people with primary education understand English words by providing translations to their native Marathi language.
This document summarizes two common non-invasive methods for measuring blood pressure: the auscultatory (Korotkoff) method and the oscillometric method. It provides a brief history of blood pressure measurement, from early invasive methods to the development of the cuff-based methods still used today. For the auscultatory method, it describes listening for Korotkoff sounds with a stethoscope as the cuff deflates and how different phases correlate with systolic and diastolic pressure. For the oscillometric method, it outlines how cuff pressure oscillations relate to blood pressure values. The document aims to review these two primary cuff-based techniques for spot blood pressure measurement.
1) The document studies the buckling behavior of fiber-reinforced plastic corrugated-core sandwich plates with different corrugation shapes and thicknesses under uni-axial compression.
2) Testing showed that for all sandwich panels, the failure mechanism was first face sheet delamination followed by core shear failure. Higher strain rates led to more foam core remaining on the face sheets after failure.
3) While sinusoidal corrugated cores showed very high buckling strengths, all corrugated core sandwich panels demonstrated increased wrinkling strength over uncorrugated designs.
Este documento contiene en análisis sintáctico de varias oraciones complejas que contienen subordinadas de distintos tipos, todas ellas encabezadas por la partícula "que". En unos casos se trata de oraciones completivas (tradicionalmente llamadas subordinadas sustantivas) y en otros, de oraciones de relativo, con o sin antecedente. Se utiliza un sistema de representación gráfica en árbol.
Este documento describe los principales géneros periodísticos de información, interpretación y opinión. Explica que la información transmite hechos de forma objetiva, la interpretación incluye el punto de vista del autor, y la opinión transmite la postura subjetiva del autor. También analiza si la prensa debe limitarse a informar objetivamente o puede influir en la opinión, y muestra ejemplos de portadas de periódicos antes de proponer un ejercicio de redacción.
This document provides a summary of offers and promotions for March 2014 from The Chemists India Trusts. It includes mega offers from GNC with discounts of 25-30% on products. There are also bundle offers, discounts of 10% on selected Guardian products, and other offers with price reductions on books, supplements, and soap gift packs. Focus categories for the month are feminine hygiene, baby care, and immunity products. The document outlines alliances with Jet Airways, Citibank, ICICI Bank, FreeCharge, American Express, and SBI Credit Card that provide additional discounts. It introduces new Guardian product launches and recommends placements of Guardian stands and the Choose & Save stand in stores. Finally, it highlights the Q
El documento describe las características del emprendimiento y la cultura emprendedora. Señala que el emprendimiento implica iniciar proyectos de manera constante y formar sueños de a poco, empezando con poco para lograr mucho. Además, define la cultura como tener lógica y saber hacer bien las cosas a través del pensamiento humano. Por último, destaca que un emprendedor es alguien motivado que vence cualquier obstáculo para alcanzar sus sueños a través de la lucha y el aprendizaje constante.
This document discusses eco-efficiency assessment models and presents a methodology for selecting the appropriate model. It begins with an introduction to eco-efficiency and a literature review that identified 40 articles describing eco-efficiency assessment models. The document then proposes an Analytic Hierarchy Process (AHP)-based procedure for choosing the best model for a given application based on predefined criteria. It applies the AHP methodology to a numerical example to demonstrate how to implement the selection process.
The document discusses different types of matrices used in environmental impact assessments to identify interactions between project activities and environmental factors. It describes simple matrices, stepped matrices, and weighted matrices. Simple matrices cross-reference project phases with environmental elements and can use symbols to show impact scale. Stepped matrices consider how activities relate to resources and how one action's impacts can affect other resources. Weighted matrices allow ranking impacts by assigning weights to environmental components and scoring project impacts.
Life Cycle Assessment (LCA) is a standardized method to track and report the environmental impacts of a product or process throughout its full life cycle. An LCA for construction includes four phases: goal and scope definition, inventory analysis, impact assessment, and interpretation. The goal and scope define the study parameters. Inventory analysis collects and calculates input/output data. Impact assessment relates emissions to environmental/health impacts. Interpretation critically evaluates strengths/weaknesses and identifies significant issues to draw conclusions. LCA provides a comprehensive way to understand and improve a building's environmental performance from cradle to grave.
This document discusses frameworks and indices for assessing sustainability. It begins by introducing common types of sustainability assessment tools, focusing on indicators and indices. It then outlines several widely-used sustainability frameworks, including the Triple Bottom Line framework and pressure-state-response model. Next, it describes the process for constructing sustainability indices, including selecting indicators, standardizing data, assigning weights, and aggregating the results. It notes that indicator selection and weighting are often inconsistent due to a lack of standardized requirements. Finally, it argues that sustainability frameworks can effectively guide indicator selection for both standalone indicators and composite indices.
An Optimization-LCA of a Prestressed Concrete Precast Bridge► Victor Yepes
The construction sector is one of the most active sectors, with a high economic,
environmental and social impact. For this reason, the sustainable design of structures and buildings
is a trend that must be followed. Bridges are one of the most important structures in the construction
sector, as their construction and maintenance are crucial to achieve and retain the best transport
between different places. Nowadays, the choice of bridge design depends on the initial economic
criterion but other criteria should be considered to assess the environmental and social aspects.
Furthermore, for a correct choice, the influence of these criteria during the bridge life-cycle must
be taken into account. This study aims to analyse the life-cycle environmental impact of efficient
structures from the economic point of view. Life-cycle assessment process is used to obtain all the
environmental information about bridges. In this paper, a prestressed concrete precast bridge is
cost-optimized and afterwards, the life-cycle assessment is carried out to achieve the environmental
information about the bridge.
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A Comprehensive Guide to DeFi Development Services in 2024
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1. Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.523-530
523 | P a g e
Criteria Interaction Modelling In The Framework Of LCA
Analysis
Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo
Department of Economics and Business, University of Catania, Italy- Corso Italia, 55. 95129. Catania.
Abstract
In this paper, we emphasize the
possibility to aggregate evaluations by using
different multi-criteria approaches and
operators, actually more suitable for
environmental problems. More precisely, values
of different indicators, qualitative and
quantitative, can be aggregate in a more flexible
and efficient way, using operators not necessarily
compensatory, allowing partial compensation
and/or not transitive preferences, including also
the very important possibility to model
interactions among criteria.
A single descriptor of multiple attributes, known
as a composite indicator, can be used to reconcile
apparently incommensurable criteria into a
comparable basis, but the current aggregation
and weighting practices in LCA are not
sufficiently rigorous, because its methodological
simplicity, usually being just weighted sums that
implicitly require preference independence
hypothesis and totally compensatory nature. We
have explored different MCDA approaches in the
literature that may be suitably applied by LCA
practitioners to enhance the technical credibility
and also identify issues affecting the selection and
implementation of more appropriate aggregation
approach. In this direction, particularly attention
can be devoted to some methods allowing also the
modelling of interaction among criteria, where
suitable techniques can actually implemented in
order to improve the validity of the results or
dealing wit ordinal information, very often
present in environmental problems.
Keywords: Life Cycle Impact Assessment, impact
categories, MCDA, interactions, weighting.
Introduction
Production and consumption of goods and
services are primary factors causing harmful effects
on the environment. For this reason, the
management of production and consumption is a
key area in order to achieve sustainable
development in our society. There is therefore a
need for suitable decision-making tools to evaluate
environmental options in all the production
processes., In this field, Life Cycle Assessment
(LCA) appears to be a valuable method for
assessing the environmental considerations of a
product or service throughout its entire Life Cycle,
including everything
from raw material extraction, processing,
transportation, manufacturing, distribution, use, re-
use, maintenance and recycling to final disposal
(Consoli et al. 1993). LCA is the term that is
currently widely accepted for environmental
assessment of products or processes on a holistic
cradle-to-grave basis (Kooijman 1993); the
International Standardization Organization is
currently working on LCA methodologies with the
aim of harmonising different methods and
promoting further establishment (Strazza C. et al.,
2010).
So, LCA models are likely to become the
future decision support tools and they include an
inventory model and an assessment model (Del
Borghi 2013) . The Life-Cycle Inventory model
(LCI) provides a detailed account of all resource
consumptions and emissions for an environmental
system, as well as for any up-stream or down-stream
activities associated with the impacts. The Life-
Cycle Impact Assessment model (LCIA) translates
and aggregates, according to fairly standardized
methods, all of the detailed information provided by
the LCI into the main resource consumption of
concern and the main environmental impact
categories (global warming, acidification, etc.). The
significance of the aggregated data relative to each
other and to all combined activities in society can
usually be obtained by the weighted sum of
normalized impacts caused by one average person.
Weighting of normalized results can be made to
identify the importance of environmental impacts or
resource consumptions, but consensus on weighting
factors has not yet been reached (Kirkeby 2007).
During the 1990s detailed contents were
assigned to the steps of LCA on the basis of co-
operation between investigators in several countries,
especially in the Society of Environmental
Toxicology and Chemistry (SETAC 2008) and the
International Organization for Standardization
(ISO). Life cycle assessment is documented in the
form of ISO standards 14040-14044 (ISO 1997; ISO
2000a; ISO 2000b; ISO 2006a; ISO 2006b), giving
instructions for LCA practitioners to conduct LCA
applications according to “good practice”. Inventory
data, environmental interventions representing a
“cradle-to-grave” perspective, are the core of LCAs.
2. Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.523-530
524 | P a g e
However, from the point of view of a decision
maker, the inventory results are usually not
sufficient for making better comparative decisions.
In comparative studies it may be found that
alternative A is better than alternative B with respect
to some points of view, but poorer in others. LCIA
enables us to interpret the results of the inventory,
but it is just the first step to draw the correct
conclusions concerning improvement approaches
(Saur et al. 1996). The consideration of
environmental effects as a consequence of
environmental interventions provides additional
information, which is not covered by the inventory
step. Several methods exist to establish weighting
factors, because weighting has always been a
controversial issue; it can be difficult, in the context
of developing an LCIA approach, to select one
method among others. A good weighting method
must include certain common features, including
transparency, simplicity in implementation,
communicability and magnitude or capacity to
assess environmental problems. Moreover, the
weighing procedures have to take into consideration
a certain number of issues including: the probability
of the attribute to cause an undesirable consequence
to the environment; the magnitude/severity of this
consequence, possibly not reversible; the temporal
aspect such as duration, time of occurrence, etc.
This results in a proliferation of data gathering,
storing and analysis techniques within the
environmental assessment tools and MCDA
methods are more relevant to these tasks. The use of
uncertainty modelling formalisms and the building
of decision support frameworks allowing the
efficient interpretation of the assessment results and
data in an uncertain environmental are greatly
needed.
In this paper, first we outline a
classification and assessment framework of the main
Multi-Criteria Decision Analysis (MCDA) methods
in the light of their ability to take into account the
peculiar needs of LCIA (Benetto 2000). We shortly
analyze different MCDA approaches to suggest the
most appropriate method for aggregating different
attributes values, underling the weighting issue of
each one. This paper therefore aims to indicate the
main guidelines representing a starting point in the
development of a robust weighting method, which
takes into consideration the importance of clearly
identifying what part of the responses deals with
subjectivity and objectivity in weighting assessment,
to provide the most relevant information during the
decision-making process. In absolute terms, there is
not recognized an ideal weighting method, so the
proposed approach combines different weighting
techniques and problems in a single weighting
framework.
1. The LCIA Analysis
The LCA provides accurate and robust
results by utilising the very detailed models
developed in the inventory stage and this phase
needs greater transparency and standardization of
methods and calculations (Garrett P., 2013). LCIA
is typically divided into five phases: selection of
impact categories, classification, characterisation,
normalisation and weighting. In the selection of
impact categories (e.g. climate change and
acidification), indicators for the categories and
models to quantify the contributions of different
environmental interventions to the impact categories
are selected. The second phase, classification, is an
assignment of the inventory data to some predefined
impact categories. In the characterisation phase, the
models make an aggregation of possible
interventions within each impact category. Values of
interventions are changed into impact category
indicators resulting from characterisation factors.
These factors measure the effect intensity of each
single emission on the environmental problem at
hand.
From a decision maker’s perspective,
impact category indicators are more manageable
than interventions, but due to their proxy
characteristics they are difficult to interpret. In order
to obtain a more comprehensive view of impact
category indicator results, some suitable
normalisation can be conducted to better assess their
overall environmental impact. Finally, the weighting
phase relates the normalised magnitude of the
indicator results with respect to the different impact
categories to reference values, calculated on the
basis of an inventory of a chosen reference system
(Consoli et al. 1993, Wenzel et al. 1997, Finnveden
et al. 1997).
Normalisation is needed in practice for
comparative evaluations but it requires trade-offs
between different category indicators, which are
very difficult to evaluate. These trade-offs are
determined as particular “weighting factors”
(weights) in the weighting phase; we observe that
these kind of weights depend also on the particular
measurement scale of each indicator and therefore
they are introduced in order to be able to obtain a
final unique aggregated value (for example, the
weighted sum) as an overall evaluation. As a
consequence, the trade-offs do not give us direct
information about the “intrinsic importance” of the
corresponding indicators, since their values depend
on the reference system actually chosen, including
the ranges of the measurement scales. This means
that if the trade -off between categories A and B is
equal to 3, the relative intrinsic importance of A is
not three times the importance of B, but only that
the “scale factor” to appropriately aggregate these
factors in an additive value function is 3. For this
reason, weighting is desirable or necessary in many
3. Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.523-530
525 | P a g e
LCA applications (e.g. Hansen 1999, Bengtsson
2000), although determination of weights is based
on subjective value choices. Weights in fact are used
with different meanings of “trade- off “ in functional
approach or “coefficients of importance” in the case
of non-compensatory methods (Minciardi et al.
2007). In this case, the inter-criteria information
required is an evaluation of the relative importance
between coalitions of criteria; such a concept of
relative importance is often translated into numbers,
called weights (for example in ELECTRE methods).
In the case of totally compensatory methods
(weighted sum), on the contrary, the weights have to
be considered as scale factors and then their
meaning is that of a trade-off between each pair of
criteria (Minciardi et al. 2008).
In our opinion, the great attention devoted
in LCIA to the weighting problems is related to the
use of the weighted sum as usual, simple and
efficient aggregation operator, accepted by the
majority of authors, at least implicitly. But this
operator, that should be applied only when all the
data are homogeneous, although very easy to be
understood, suffers from a lot of drawbacks. First of
all, it is perfectly compensatory, that is a great
advantage with respect to some characteristics, and
can always compensate disadvantages, even if very
huge, with respect to other points of view. In our
opinion, this implicit hypothesis is very dangerous
in the framework of environmental analysis, where
it is often not possible to compensate (for example,
with high financial cash flows) some very dangerous
situations (concerning public health). Another weak
point of the weighted sum is that this kind of
aggregation operator can be applied only if there is
preference independence among the considered
impact indicators. This means that, if categories a
and c have the same evaluations with respect to a
subset of considered criteria, and categories b and d
also have the same evaluations – but different from
the evaluations of a and c - with respect the previous
considered subset of criteria, and category a is
preferred to category b, also c should be preferred to
d, independently of their common evaluations with
respect to the remaining criteria. This means that the
weighted sum approach is not able to model any
interaction among criteria, where this characteristic
affects a lot of real environmental situations and
should be taken into consideration (Matarazzo
2012).
Although there is an approximate
consensus on the procedural framework of LCIA,
the methods may vary in LCA applications.
Different methods can of course produce different
results. The results depend, among other things, on
the coverage of impact categories, the chosen
impact category indicators and the models chosen
for characterisation factors. Furthermore, as
observed before, a reference system used in
normalisation can dramatically affect the
interpretation and the results, also in the framework
of the weighted sum operator. In practical
application, in order to avoid some assessment
difficulties and to simplify the implementation of
well known approaches, “less is better” has been
often applied in LCIA (Lo Giudice 2011). This
approach assumes that all amounts of the same
kinds of interventions lumped together cause
harmful effects on the environment on the basis of
their intrinsic hazard characteristics, regardless of
where and when they take place, and only whether
the amounts are above or below certain thresholds
(White et al. 1995). Although the advantage of the
“only-above-threshold” approach is clear, its
implementation in practice has been developed only
slowly, due to the complexity of applying it on a life
cycle scale.
In LCIA the values of environmental
interventions assessed in the inventory analysis are
interpreted on the basis of their potential
contribution to the overall environmental impact.
The term “potential contribution” indicates that the
result of LCIA is not an absolute value, and that
LCIA is a relative approach, part of a more
complete analysis of environmental assessments.
The idea is that comparative studies need more
detailed data on temporal and spatial aspects than
that required by absolute methods, such as
environmental risk assessment. Weighting is a
process which can take place within the different
steps of LCIA and LCA interpretation to aggregate
the results into a single score; LCIA is used to
evaluate the significance of the environmental
interventions contained in a life cycle.
Determination of weights has been a
controversial issue in LCIA because of its
subjectivity. For this reason, for example, the ISO
provides no examples of weighting. Despite the
weight assessment being necessary in a lot of
aggregation operators, different approaches have
been proposed in the specific literature in order to
avoid excessive arbitrariness in this so difficult
issue, but also taking appropriately into account the
subjective preferences of the decision-maker. LCIA
results for each process of the life cycle have then to
be aggregated in order to get reliable conclusions
and this aggregation framework has to minimize the
information loss and the compensation between
impacts and to reduce the amount of data in order to
improve the intelligibility of results. The impact
results of each scenario cannot be easily compared
with each other and impacts cannot be aggregated as
they represent very different realities.
In the following, we shortly present the main
features of some well known MCDM methods,
classified – as usually- in Functional approaches;
relational approaches and interactive approaches
4. Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.523-530
526 | P a g e
2. Functional approaches
This method selects a suitable aggregation
function, i.e. a real value function (utility or value
function) associating to each alternative a real
number, representing its degree of preference, that
allows us to directly make comparisons and obtain
the final recommendation for choice or ranking
problems.
The main features of this approach are the
following: inter-criteria information as trade-off
weights (substitution rates), usually constant;
compensatory logic (only sometimes not perfectly
compensatory). Formally, the utility function is
expressed as U(a) = U(g1(a), g2(a), ...,gm(a)), aA,
where U is a function of m variables, increasing in
all its argument (marginal utilities) A is the set of
feasible alternatives and G the set of considered
criteria.
4.1. Additive models
The simplest form of such a utility function
is the additive representation, that is
U(a) = Gj
jj
))a((gv ,
where, for each, jG, vj is a non decreasing
function and
))(( agv jj
is the marginal utility. But,
as we said before, this kind of representation is
based on the hypothesis of preference independence,
that is no interaction among criteria, usually non
realistic particularly in environmental impact
analysis.
Very often, a particular case of utility function
is considered, by the hypothesis
))(( agv jj
=jgj(a),
where j0, for each jG, is the (constant) trade off
weight, used also to normalize the evaluations on
different criteria. Therefore, we obtain the weighted
sum utility function,
U(a) = Gj
jj
)a(g ,
That is one of the most elementary aggregation
operators, as above recalled, that requires the
elicitation of a set of trade-off weights. This very
simple approach is used in a lot of real life
applications, such as in LCIA.
2.2. Non additive models
There are also some non additive utility
functions, for example in the form of multiplicative
or polynomial functions. Apart from them, one of
the most interesting approaches is given by the class
of non-additive integrals, also called fuzzy integrals.
In this approach, the main very interesting idea
concerning weighting is that the intrinsic importance
of criteria is represented giving a weight to each
subset of criteria from G. Then it is possible to
explicitly represent the importance of each coalition
of criteria, and therefore also their interactions.
3.3. The Analytic Hierarchy Process
The Analytic Hierarchy Process (AHP)
structures the decision problem into levels which
correspond to DM’s understanding of the situation:
objectives, criteria, sub-criteria and alternatives; by
breaking the problem at hand into different levels,
the DM can focus on smaller sets of decisions. This
method (Saaty 2008) is based on four main axioms:
given some alternatives, the DM is able to provide a
pairwise comparison of these alternatives with
respect to any criterion on a ratio scale, which is
reciprocal. One can formulate the decision problem
as a hierarchy; all criteria and alternatives which
impact one decision problem are represented in the
hierarchy. After estimating the weights, the DM is
also provided with a measure of the inconsistency of
the given pairwise comparisons. It is important to
note that the AHP does not require decision makers
to be consistent in giving preference information,
but rather provides a measure of inconsistency, as
well as a method to reduce this measure if it is
deemed to be too high. After generating a set of
weights for each alternative and for any criterion,
the overall priority of the alternative is computed by
means of a linear, additive function. The AHP is a
very widespread approach in many real-world
applications and it explicitly deals with the issue of
hierarchy in decision problems. AHP can be
considered a particular case of multi-attribute value
functions approach, thus being completely
compensatory in nature. This implies that the
weights derived in an AHP framework are always in
the form of trade-offs and never of importance
coefficients.
4. Relational approach
This approach is characterized by splitting
the decision analysis in two steps. In the first one,
we build up some outranking relations, making a
direct comparison between each pair of alternatives
with respect to each criterion, individually
considered. The global outranking relations aSb
means “a is as least as good as b with respect to all
criteria from G”. Therefore, in the second step, these
relations are exploited in order to obtain the final
recommendation. The main features of this approach
are the following: building of crisp or fuzzy
outranking relations and their exploitation; infra-
criteria information by the introduction of suitable
thresholds to take into consideration interval
indifference and preference, incomparability and
veto situations; inter-criteria information in the form
of importance weights; logic usually locally non-
compensatory. The outranking relation aSb holds if
and only if there are enough arguments to say that a
is at least as good as b, while no serious reason to
refute this statement exists (Roy 1985). The final
recommendation depends on the global outranking
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527 | P a g e
relation, and not directly on the alternatives
evaluations with respect to each considered
criterion. The preference model of this approach is
very rich, but it requires the elicitation of a lot of
parameters, including importance weights, that
express the intrinsic relative importance of each
criterion or coalition of criteria and that then do not
depend on the different scales of measurement.
These weights have a crucial role in the building of
the outranking relations.
The most important outranking methods are the
following.
4.1 ELECTRE methods
The family of ELECTRE methods (Roy
1995., Figueira, et al. 2005), is based on the concept
of concordance and discordance analysis, and each
one is devoted to solving specific decisional
problems; ELECTRE I for choice problems,
ELECTRE II and III for ranking problems,
respectively building “nested” outranking (i.e. with
different strength) and fuzzy outranking relations;
ELECTRE IV that does not require elicitation of
importance weights; ELECTRE TRI for sorting
problems. The outranking relations are built taking
into consideration the importance of criteria
coalition (i.e. their weights) supporting the idea that
a is at least as good as b (concordance test) and that
there is no strong opposition to this sentence (non-
discordance test). A problem specifically connected
with the outranking approach is that it is necessary
to assess a large number of ad hoc parameters, i.e.
indifference and preference thresholds, concordance
threshold, discordance thresholds and weights and
this may cause loss of transparency and consistency
in the model (Norese M.F., 2006).
4.2 PROMETHEE
In the PROMETHEE methods (Brans
1982), for each criterion gjG and for each pair of
alternatives (a,b) a degree of preference
Pj(a,b)[0,1] is defined as a non decreasing function
of the difference of evaluations gj(a) - gj(b). The
shape of this function and the value of its parameters
are chosen by the DM among some predefined
types.
Using the notation kj for the weight of criterion
gj, the global preference degree (a,b) is defined as
(a,b) =
F
F
j
j
j
j
j
k
baPk ),(
.
The final recommendation (ranking) is based
on the concept of outgoing + flow and ingoing
flow -
, defined as following for each feasible
alternative a:
+(a) =
Ab
ba,
-(a) =
Ab
ab,
.
PROMETHEE I method gives us a partial
preorder of feasible alternatives, (that means that
incomparability between alternatives is allowed) as
the intersection between the complete ascending
preorder and complete descending preorder, built up
respectively using the values of +(a) and -(a)
(Brans and Vincke 1985).
PROMETHEE II method proposes the building
of a complete preorder of feasible alternatives,
taking into consideration the so called net flow
((Brans 1982, Oberschimidt J. et al., 2010):
(a) = +
(a)--
(a).
The PROMETHEE approach is based on a
simple mathematical structure and is easy to use. In
this model, preference intensity can be used, and the
degree of compensability allowed is high.
Moreover, weights cannot be considered as
importance coefficients, but they should be derived
as trade-offs. The possibility of rank reversals is
high (Munda G.2008).
4.3 REGIME
REGIME Analysis is a method that
considers pure ordinal information, and could be
considered as the ordinal generalization of the
concordance methods (Hinloopen and Nijkamp,
1986; Hinloopen, Nijkamp and Rietveld, 1983). The
main idea is the concordance index Cil concerning
the pair of feasible alternatives ai, al :
Cil =
ilj
jw
,
where wj is the importance weight of
criterion gj, j=1, 2,…,m, and il, is the subset of
criteria for which ai is at least as good as al., The
method considers only the sign of the difference Cil
– Cli for each pair of alternatives, and not its value,
since the data my be ordinal. In this method, the first
step is the construction of the so-called impact
matrix, composed of the pairwise comparisons of
alternatives, that is then suitably exploited. This
method presents the advantage of taking into
account ordinal information. It should be recalled
that weights can also be simply ordinal in nature,
and therefore from this point of view REGIME can
be considered entirely consistent in its use of
weights as importance coefficients. The only
assumption required is that of a uniform distribution
of the weights along the concordance region, that is
not restrictive. However, when mixed information
on criterion scores is present, the aggregation
procedure becomes cumbersome. To deal with both
qualitative and quantitative information, it is
assumed that qualitative information is the
representation of unknown quantitative information.
Building on this assumption, a cardinalization
scheme is applied and then all the ordinal
information is transformed into quantitative. Besides
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528 | P a g e
considerations on the way, there is here a basic
methodological problem with weights. In fact, if
weights are connected to quantitative information
and the intensity of preference concept is used,
weights can only be trade-off and not importance
coefficients.
4.4 NAIADE
NAIADE (Novel Approach to Imprecise
Assessment and Decision Environments) (Munda
1995) is a discrete multi-criteria method whose
impact matrix may include crisp, stochastic or fuzzy
measurements of the performance of an alternative
with respect to an evaluation criterion, thus it is very
flexible for real world environmental applications. A
peculiarity of NAIADE is the use of conflict
analysis procedures to be integrated with the multi-
criteria results. This method can give the following
information: ranking of the alternative according to
the set of evaluation criteria; indications of the
distance of the positions of the various interest
groups; ranking of the alternatives according to
actors’ impacts or preferences. The whole NAIADE
procedure can be divided into four main steps:
pairwise comparison of alternatives according to
each criterion; aggregation of all criteria
evaluations; ranking of alternatives; social conflict
analysis. This method presents many advantages:
the possibility of taking into account various forms
of mixed information in an equivalent way; the
possibility of determining the degree of
compensability allowed in the aggregation
procedure; the explicit use of a conflict analysis
procedure, thus distinguishing clearly the technical
and social compromise solutions. However, this
method suffers also from some serious limitations:
the impossibility of using weights explicitly and, if
they are used, they could only be trade-offs and
never importance coefficients; the large number of
ad hoc parameters needed for the elaboration of the
multi-criteria impact matrix; the fact that qualitative
information can be used only in the form of
linguistic variables and can never be measured on a
purely ordinal scale.
5. Interactive approach
It consists of a systematic exchange of
information between DM and analyst about local
preference evaluations of alternatives and about the
consequent computation results, with the aim of
searching for a solution (descriptive logic: Multiple
Criteria Decision Making– MCDM), or for the
comprehension of a coherent evolution of the
decision process (constructive approach – MCDA).
In the first step, this approach requires a minimum
number of inter-criteria information, such as trade-
off weights, given by the DM.
The analyst provides a first alternative (or a
first set of alternatives) considered satisfactory to
propose to DM, who, during the discussion phase,
gives the analyst further information about his/her
preferences. Therefore there is a new computation
phase and so on. The procedure stops when the DM
is satisfied by the alternative proposed, which is not
always necessarily efficient.
A lot of interactive methods use the idea of
a reference point, defined in the criteria space, and
sometimes that of ideal point, whose coordinates are
usually the maximal values attainable by each
criterion considered as a single one. There are two
main categories of interactive methods: those that
are based on the hypothesis of the existence of a
utility function, implicit in the mind of DM, and
methods that try to minimize a particular distance
from a reference point. Among them we recall the
Goal Programming and the STEM method
(Benayoun, et al., 1971).Usually in this case some
information about trade-off weights are explicitly or
implicitly required, as well as the normalization of
alternatives evaluations. Recently, very interesting
approaches have been proposed in this framework,
combining the advantages of interactive methods
and genetic algorithms.
Conclusions
The interpretation of the LCA results in
environmental problems and analyses should be
actually aided by the application of MCDA
methods, appropriate from the methodological point
of view to the specific decision problem at hand.
Decision analysis is a set of methods of systems
analysis and operations research, going from the
classical mathematical programming to the new
MCDM and MCDA approaches, which should be
extensively applied in supporting real life decisions
in the presence of a number of conflicting points of
view. In the LCA literature, decision analysis
methods are often known and used, up to now, only
as tools for the weighting phase of LCIA, especially
in the context of panel methods in which opinions
about impact category weights are asked for from an
individual person or a group of persons. However,
the use of decision analysis tools has not been very
common in LCIA applications.
This is partly due to the fact that LCA
practitioners have been reluctant to use weightings,
as a consequence of their subjectivity and difficulty
in their assessment. But weighting is only an
optional phase in the ISO standards due to its
subjective results, and in the development of LCIA
methodology during the recent years researchers
have overall concentrated on the mandatory phases.
Only very few analyses have been conducted using
more sophisticated and efficient approaches, such as
MCDA methods. Possibly, one of the main reasons
for this behaviour is that only a few LCA
researchers have enough information to use these
7. Agata Matarazzo, Maria Teresa Clasadonte, Carlo Ingrao, Antonio Zerbo / International
Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.523-530
529 | P a g e
kinds of decision analysis approaches in a context
different from assessment of trade-offs.
Therefore, our main attention should be
drawn not to the weighting problem in se, but to all
decisional processes, with a clear idea of the
different roles of all the actors (scientists, experts,
decision-makers, stakeholders) involved in the
process. Decision analysis is actually a process, with
its own dynamic evolution, that has to be coherent
with the preferences and the goals of the decision-
maker. In order to support the decision-maker in
his/her difficult activity, a multi-criteria approach
could be very useful, but the particular method to be
used must be correctly chosen and applied. This
means, in particular, that the method we like to
apply needs to be appropriate not only to the multi-
criteria decision problem at hand (choice, ranking,
classification, sorting), but also to the particular kind
of data and information we have (cardinal, ordinal,
qualitative, crisp, fuzzy, probabilistic,...).
Any MCDA method, on the other hand, as
observed before, requires some peculiar preference
information and technical parameters, among those
very often weighting, in the form of trade-offs or
importance coefficients. Only few, but very
interesting approaches, do not require a priori this
kind of information, that sometimes is given
implicitly by the decision-maker, as in interactive
approaches, or is obtained as output when we use
preference information in the form of examples of
decision, like in the dominance-based rough set
approach. In any case, the choice of an MCDA
method has to take into serious consideration the
actual information DM can, wants and is able to
give, avoiding forcing him/her to provide technical
information required by the method, but that DM
does not know or cannot give, often also too
difficult or not understandable. It is the method that
must be suitable and appropriate to the available
information, not the information that has to be
adapted or forced in order to be used in any case in
an approach chosen a priori.
The interpretation of LCA results could be
greatly improved by the use of suitable aggregation
approaches based on MCDA proper methods, based
on a functional or relational approach or on
interaction between scientist and DM.
As a more general conclusion, we would
suggest that uncertainty management and
quantitative analysis has to be further addressed in
the development and application of MCDA
methods, because uncertainty is also a primordial
factor in decision making, and not only in the
environmental field.
Alternatives approaches to LCA modelling
may also be useful, as well as some additional areas
where further sensitivity and robustness analysis
could improve presentation of results; MCDA
methods allow very well for sensitivity analysis, a
technique in which a variable is systematically
modified to determine the impact on the outcome. In
this case, we are particularly interested in modifying
the weights assigned to various criteria. Of course,
other standardisation of LCA studied should be
improved, from a perspective of both transparency
as well as comprehensiveness of LCA modelling.
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