scholarly journals Study on Estimation Methods of Life Cycle GHGs Emission for the Mine Reclamation Project

2021 ◽  
Vol 54 (6) ◽  
pp. 733-741
Author(s):  
Soo-lo Kim ◽  
In-Ho Kwak ◽  
Dae-Hyung Wie ◽  
Kwang-ho Park ◽  
Seung-Han Baek
Keyword(s):  
Life Cycle ◽  
Mine Reclamation ◽  
Estimation Methods ◽  
Reclamation Project

A Multilayer Taxonomy of Cost Estimation Techniques, Looking at the Whole Product Lifecycle

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Stefania Altavilla ◽  
Francesca Montagna ◽  
Marco Cantamessa
Keyword(s):  
Systematic Review ◽  
Decision Making ◽  
Life Cycle ◽  
Cost Estimation ◽  
Product Life Cycle ◽  
Recent Literature ◽  
Estimation Methods ◽  
Product Lifecycle ◽  
Conscious Decision ◽  
Decision Making Tool

Product cost estimation (PCE) still draws the attention of researchers and practitioners, even though it has been extensively discussed in the literature for more than 20 years. This is due to its central impact on the company's performance. Nowadays, the adoption of cost estimation methods seems to be limited, despite the multitude of examples and applications available. A possible reason is the multitude of approaches and techniques proposed in the literature, which, instead of representing a guide for enabling possible implementations, actually create confusion and ambiguity on their appropriateness for a particular application. Hence, this paper aims to provide a systematic review of the recent literature in the field of PCE, and intensively investigates the aspects that can enable a more conscious decision on the type of technique to be adopted. This results in the identification of five different perspectives, which can be taken simultaneously into account. By combining the different viewpoints, a new multilayer framework is derived, with a specific focus on the whole product life cycle. The proposed framework can be used as a decision-making tool by both researchers and practitioners. In fact, the former group can benefit from the new structure, as a way to identify new areas of possible research opportunities. The latter group is provided an operative guide for the application in industrial contexts.

scholarly journals Modern regulations of safety assurance for maglev transportation

2015 ◽  
Vol 1 (2) ◽  
pp. 127-142 ◽  
Author(s):  
Vladimir Vladimirovich Shmatchenko ◽  
Pavel Andreevich Plekhanov
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
High Speed ◽  
Safety Management ◽  
Estimation Methods ◽  
Transport Systems ◽  
The European Union ◽  
New Approach ◽  
Look Ahead ◽  
Railway Safety

In article regulatory framework of maglev are considered, the international experience is analysed and conclusions for Russian practice are drawn. Modern management methods of safety of transport systems are based on principles of advance to occurrence of dangerous events. These principles include: - application of forecasting methods (aprioristic estimation methods) at an estimation of safety and substantiation of safety measures - a principle of «the new approach»; - estimation of safety taking into account risk from action of casual and systematic failures; - safety management in a complex with management of reliability, availability, maintainability, material support and life cycle cost. Necessity of application of «the new approach» to railway safety, including the high-speed railways, formally has been established by the Railway Safety Directive 2004/49/EC. This Directive orders to use: - analysis and management of risk at all life cycle stages of the technical systems participating in formation of traffic service, and at early stages of life cycle are made look-ahead estimations of risks which are compared with admissible values of risk; - common safety targets, common safety indicators and common safety methods on all space of the European Union; - common approaches to certification of safety and the harmonised supervision bodies; - common typical safety management system, based on ISO 9001principles. For activity expansion on performance of Railway Safety Directive of the European Committee for Electrotechnical Standardization CENELEC have been developed and now frame standards EN 50126, EN 50128, EN 50129 are applied.

scholarly journals Application of Multiple Regression and Artificial Neural Networks as Tools for Estimating Duration and Life Cycle Cost of Projects

2020 ◽  
Vol 7 (1) ◽  
pp. 1-27
Author(s):  
Brian J. Galli
Keyword(s):  
Life Cycle ◽  
Multiple Regression ◽  
Life Cycle Cost ◽  
Estimation Methods ◽  
Second Phase ◽  
Neural Network Models ◽  
Statistical Tools ◽  
Planning Stage ◽  
Statistical Approaches ◽  
Artificial Neural

Project managers face complex challenges when planning project stages because contract durations and project costs are difficult to predict accurately. The purpose of this study is to investigate statistical tools and concepts that can be integrated in the second phase of the project life cycle: the planning stage. Furthermore, this study aims to compare the accuracy of multiple regression and artificial neural network models, as well as the application of simulation in construction models used in predicting project duration and cost. This paper will also discuss the industry's current estimation methods, the use of statistical approaches, simulation, and the relationship between the application statistical tools and project success. Thus, this review identifies the trending statistical tools used by scholars to develop regression and neural models to solve the complexity of cost and duration estimation. The findings indicate that although the industry needs more accurate predictions and estimating tools, and regardless of the investigations and advancements made with integrating statistical tools, implementing these statistical approaches is faced with barriers.

scholarly journals Life cycle costs to treat secondary municipal wastewater for reuse in cooling systems

2013 ◽  
Vol 3 (3) ◽  
pp. 224-238 ◽  
Author(s):  
Ranjani Theregowda ◽  
Ming-Kai Hsieh ◽  
Michael E. Walker ◽  
Amy E. Landis ◽  
Javad Abbasian ◽  
...  
Keyword(s):  
Life Cycle ◽  
Power Plant ◽  
Thermoelectric Power ◽  
Municipal Wastewater ◽  
Estimation Methods ◽  
Life Cycle Costs ◽  
Tertiary Treatment ◽  
Cooling Systems ◽  
Treatment Alternatives ◽  
Thermoelectric Power Plant

Life cycle costs (LCC) calculated using standard databases and first-stage cost estimation methods were used to compare selected tertiary treatment processes used to treat secondary treated municipal wastewater (MWW) for reuse in thermoelectric power plant cooling systems. Use of MWW increases challenges such as scaling, bio-fouling and corrosion. Tertiary treatment coupled with chemical inhibitors can enable use of MWW in cooling systems. To determine LCC for different treatment options, a life cycle conceptual costing (LC3) tool was developed to estimate costs within conceptual accuracy range (15–40%), defined by the International Association for the Advancement of Cost Engineering. LCC estimation showed that treatment alternatives with higher chemical consumption were most expensive. Operational phase of tertiary treatment and use of chemical conditioning agents dominates annual costs. Of various tertiary treatment alternatives evaluated, range of total costs to treat 7.75 million gallon/day (1 gallon = 3.79 L) – amount of water required by a 550 MW thermoelectric power plant recirculating cooling system – was estimated to be $0.91–1.32/kgal (2009 USD) excluding taxes and overhead costs. This range was found to lie between rate charged for river water withdrawal with filtration and chemical conditioning, i.e. an average of $0.74/kgal (2009 USD) for some areas of the USA, and the national average rate for potable city water, i.e. $2.95/kgal (2009 USD).

A Methodology to Quantify Cumulative Damage Function (CuDF) for Integration Into an Object-Oriented Life Cycle Assessment (LCA)

2017 ◽  
Author(s):  
Devdatta Deo ◽  
Marcos Esterman ◽  
Brian K. Thorn
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Failure Modes ◽  
Object Oriented ◽  
Damage Function ◽  
Cumulative Damage ◽  
Remaining Useful Life ◽  
Estimation Methods ◽  
Object Oriented Approach ◽  
Oriented Approach

Life Cycle Assessment (LCA) is one of the most widely used tools to determine environmental impact of products and processes. One of the main concerns with the life cycle assessment tool is the limited comparability of LCA results due to limitations in defining the functional unit. In response to this, an object-oriented approach has been proposed and further developed by related research. This object-oriented approach relies on the calculation of a Cumulative Damage Function (CuDF) to quantify the amount of consumed life in each item in the bill of materials used in an LCA. The focus of this work is to develop a framework to quantify CuDF that leverages exiting reliability and life estimation methods, namely the concepts of Remaining Useful Life (RUL) and Failure Modes and Effects Analysis (FMEA). The framework is applied to a simple example to motivate its use and utility.

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