scholarly journals A Matter of Factor: A Proposed Method for Identifying Factors that Influence Design Effort Levels in Product Design

2019 ◽  
Vol 1 (1) ◽  
pp. 1025-1034 ◽  
Author(s):  
Alexander Holliman ◽  
Avril Thomson ◽  
Abigail Hird ◽  
Nicky Wilson
Keyword(s):  
Product Design ◽  
Historical Data ◽  
Influential Factors ◽  
Design Project ◽  
Advantages And Disadvantages ◽  
Significant Challenge ◽  
Number Of Factors ◽  
Historical Data Analysis ◽  
Time Required ◽  
Or Task

AbstractDesign effort, the amount of time required to complete a project or task (Salam et al., 2009; Salam and Bhuiyan, 2016), is a required resource for any design project which can be influenced by a number of factors. Estimating design effort is a significant challenge that can be mitigated through an understanding of these influential factors. This understanding is held as tacit knowledge by experts, earned through experience; yet, although these factors vary in type and impact, understanding their details can provide insight and improve future estimations. Some previous methods to estimate design effort identify these factors, either from: expert opinion, or historical data analysis with each approach has advantages and disadvantages.This paper is comprised of three parts:A review of published methods and tools for estimating product design effort and whether they consider and identify influential factors; an analysis of possible trends in the identification of factors influencing product design project length; and a new method for identifying the influential factors of product design project length.

Teaching Computer Based Historical Data Analysis

1994 ◽  
Vol 6 (1) ◽  
pp. 52-58 ◽  
Author(s):  
Charles Anderson ◽  
Robert J. Morris
Keyword(s):  
Data Analysis ◽  
Social History ◽  
Historical Data ◽  
Good Practice ◽  
Computer Assisted ◽  
Historical Data Analysis ◽  
University Of Edinburgh ◽  
Computer Based ◽  
The University

A case study ofa third year course in the Department of Economic and Social History in the University of Edinburgh isusedto considerandhighlightaspects of good practice in the teaching of computer-assisted historical data analysis.

MODELING AN ABBREVIATED PRODUCT DESIGN CYCLE IN A FIRST-YEAR ENGINEERING DESIGN COURSE

2012 ◽  
Author(s):  
Patricia Kristine Sheridan ◽  
Jason A Foster ◽  
Geoffrey S Frost
Keyword(s):  
Product Design ◽  
Engineering Design ◽  
Conceptual Design ◽  
Design Project ◽  
University Of Toronto ◽  
Praxis Ii ◽  
Engineering Communication ◽  
Detail Design ◽  
Praxis I ◽  
Design Experience

All Engineering Science students at the University of Toronto take the cornerstone Praxis Sequence of engineering design courses. In the first course in the sequence, Praxis I, students practice three types of engineering design across three distinct design projects. Previously the final design project had the students first frame and then develop conceptual design solutions for a self-identified challenge. While this project succeeded in providing an appropriate foundational design experience, it failed to fully prepare students for the more complex design experience in Praxis II. The project also failed to ingrain the need for clear and concise engineering communication, and the students’ lack of understanding of detail design inhibited their ability to make practical and realistic design decisions. A revised Product Design project in Praxis I was designed with the primary aims of: (a) pushing students beyond the conceptual design phase of the design process, and (b) simulating a real-world work environment by: (i) increasing the interdependence between student teams and (ii) increasing the students’ perceived value of engineering communication.

scholarly journals Pulsed Flow Turbine Design Recommendations

2021 ◽  
Vol 6 (3) ◽  
pp. 24
Author(s):  
Florian Hermet ◽  
Nicolas Binder ◽  
Jérémie Gressier ◽  
Gonzalo Sáez-Mischlich
Keyword(s):  
Design Of Experiments ◽  
Performance Indicator ◽  
Influential Factors ◽  
Factor Level ◽  
Viscous Effects ◽  
Inviscid Flows ◽  
Screening Design ◽  
Pulsed Flow ◽  
Number Of Factors ◽  
Turbine Design

A preliminary analysis of turbine design, fit for pulsed flow, is proposed in this paper. It focuses on an academic 2D configuration using inviscid flows, since pressure loads due to wave propagation are several orders of magnitude higher than friction and viscous effects do not significantly impinge on the inviscid part, as previously shown by Hermet, 2021. As such, a large parametric study was carried out using the design of experiments methodology. A performance indicator adapted to unsteady environment is carefully defined before detailing the factors chosen for the design of experiments. Since the number of factors is substantial, a screening design to identify the factors influence on the output is first established. The non-influential factors are then omitted in a more quantitative study of the output law. The surface response calculation allows determining the factor level favouring the best output. Consequently, the main trends in the turbine design driven by a pulsed flow can be stated.

Estimating waiting and idle times for special queuing situations of tree harvesting machines

1981 ◽  
Vol 11 (1) ◽  
pp. 99-104 ◽  
Author(s):  
C. H. Meng
Keyword(s):  
Waiting Time ◽  
Historical Data ◽  
Idle Time ◽  
Processing Times ◽  
Mean Waiting Time ◽  
Analytical Formulae ◽  
Input Time ◽  
Time Required ◽  
Tree Harvesting ◽  
Normally Distributed

The purpose of this study is to develop analytical formulae for special queuing situations which occur during the operations of the felling and processing devices of a tree harvester, and the pickup and processing devices of a tree processor. Analytical formulae are used to estimate mean waiting time and mean idle time; in case 1 both "input" times and processing times are normally distributed; in case 2 "input" times are normally distributed and processing times are Poisson distributed. "Input" time is a term used for convenience to denote time required to fell a tree by a harvester or time required to pick up a tree by a processor. Methods of choosing distributions for representing "input" times and processing times are provided. In addition, there are two examples, using historical data, which demonstrate the applications of the analytical formulae.

scholarly journals Comparison between conventional tube method and gel card technique for blood crossmatching: A study in a tertiary care center of north India

2020 ◽  
Vol 11 (4) ◽  
pp. 6500-6503
Author(s):  
Ragini Singh ◽  
Prachi Garg ◽  
Anoop Kumar ◽  
Sucheta ◽  
Meenal Babra
Keyword(s):  
Blood Transfusion ◽  
Sensitivity And Specificity ◽  
Care Center ◽  
Tertiary Care ◽  
Test Tube ◽  
North India ◽  
Advantages And Disadvantages ◽  
Time Required ◽  
Spin Tube ◽  
Cross Matching

The cross-matching of blood can be performed by various methods like saline tube method and gel card technique. Saline tube method is most commonly used in blood banks, whereas the latest method used is Gel card technique for cross-matching. Both techniques have their advantages and disadvantages. The main aim of this study was the comparison of gel card and conventional tube test for sensitivity and specificity, time and efficacy. This prospective study was done at the Department of Blood Transfusion, BPS GMC Khanpur Kalan, Sonipat, Haryana. A total of 500 samples collected at the Department of Blood Transfusion, were cross-matched using conventional tube method (spin tube method) with and without using AHG and Gel card Method. 497 (99.4%) samples were compatible, and 3 (0.6%) samples were incompatible with Gel card method, but by test tube method 492 (98.4%) samples were consistent, and 05(1.6%) were false positive (FP). Incompatibility of those 05 samples (FP) disappeared after incubation with AHG reagent at 37°C saline tube method. The sensitivity and specificity of both gel card method and saline tube method with AHG methods is 100% whereas the specificity of saline tube method without AHG is 98.9%. The average time taken by Gel card method was 20-30 minutes for a single compatibility test whereas in conventional spin tube method with the use of AHG (IAT) average time required was 90 minutes and without AHG it was 45-60minutes. The sensitivity and specificity of the spin tube method and the gel card method are comparable to each other. But the gel card method is easy to perform, rapid, reliable procedure and results can be recorded. In contrast, spin saline tube method is more time consuming, and results cannot be preserved. Thus gel card technique can be preferred over the spin tube method.

scholarly journals The Method for Product Design Selection with Incomplete Linguistic Weight Information Based on Quality Function Deployment in a Fuzzy Environment

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ming Li
Keyword(s):  
Product Design ◽  
Quality Function Deployment ◽  
Design Development ◽  
Quality Function ◽  
Advantages And Disadvantages ◽  
Fuzzy Environment ◽  
Design Requirements ◽  
Design Selection ◽  
The Given ◽  
The Relationship

The selection of a design for the given product is a critical problem in product design development. Focuses of the designers and customers on the design are not identical. In order to bridge the gap and provide a more relaxing way to select the design, a new method based on quality function deployment (QFD) is proposed. In such a method, customers are required to give their linguistic preferences on the design with respect to the customer requirements (CRs). In the rating of the weight of CRs, they are allowed to provide incomplete linguistic weight information and the objective optimization model is proposed to derive the exact linguistic weight information. Designers are required to rate the correlation between design requirements (DRs) and the relationship between the CRs and DRs to construct the house of quality. Opinions given by the customers are translated into the opinions with respect to the DRs based on the QFD. Afterwards, the priorities of the designs and design requirements are determined. The assessment results not only show the contribution of each design requirement to the customer satisfaction but also show the advantages and disadvantages of each design from the designers’ perspective clearly and directly. An example is provided to validate the applicability of the proposed method.

scholarly journals Analysis on the Key Points of Influential Factors in Product Morphological Design

2018 ◽  
Vol 176 ◽  
pp. 02005
Author(s):  
Juanling Guo ◽  
Kaining Meng ◽  
Ying Meng
Keyword(s):  
Product Design ◽  
External Factor ◽  
Influence Factors ◽  
Influential Factors ◽  
High Tech ◽  
Key Points

For designing out high-tech products which can attract consumers and satisfy their demands, this paper has analysed the influencial factors of product morphological design. Firstly, the author used the principle of semiotics and man-machine engineering to analyse products systematically, to optimize the complex of “man-machine-environment”, and then I studied the product's own factor, man-machine factor and external factor. In addition, this paper explains the influence factors in the product morphological design with examples. Moreover, the function and the form of product are ingeniously combined to improve the quality and connotation of the product. To sum up, this paper based on the theory of influential factors in product morphological design, proposed innovative thought, treat product morphological design from different perspectives, which will provide a reference for the later product design.

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