A Study of the Impact of Knurling Parameters on Knurl Quality With the Design of Experiments Approach

1999 ◽  
Author(s):  
Chang-Xue (Jack) Feng ◽  
Chinh Tran
Keyword(s):  
Design Of Experiments ◽  
Process Parameters ◽  
Process Design ◽  
Fractional Factorial ◽  
Key Factors ◽  
Local Company ◽  
Factor Interactions ◽  
The Impact ◽  
Error Method

Abstract A local company produces various types of connecting cables for a number of military and civilian customers. A key part of these cables is the knurled component to provide proper frictional force for easy assembly and maintenance. In the past, the company has usually faced a problem of inconsistent knurl quality. There has been no report in the literature about knurling process design. Vendors of knurling tools could only recommend the traditional try-and-error method. This research uses the design of experiments (or 2n-k fractional factorial design) approach to examine the impact of different knurling process parameters on the knurl quality. Our purpose is to determine the key factors and factor interactions that have significant effect on the knurl quality so that we could set the process parameters in such a way that the process is robust (or insensitive) to any uncontrollable factors. As a result, a robust knurl quality is achieved. A case study illustrates our approach.

scholarly journals Collaboration, Mentoring and Co-Teaching in Teacher Education

2011 ◽  
Vol 13 (2) ◽  
pp. 70-86 ◽  
Author(s):  
Gertrude Sachs ◽  
Terry Fisher ◽  
Joanna Cannon
Keyword(s):  
Teacher Education ◽  
Doctoral Students ◽  
Junior Faculty ◽  
Key Factors ◽  
Collaborative Relationships ◽  
The University ◽  
The Impact ◽  
Individual Accountability

Collaboration, Mentoring and Co-Teaching in Teacher EducationCollaboration at the university level is a fundamental element needed to enhance teaching (Cochran-Smith & Fries, 2005) and reflection is a critical component of teacher education (Dewey, 1933, 1938). A case study is presented of one senior university faculty member's experiences co-teaching with two doctoral students seeking to understand the impact of shared decision-making and authentic collaboration on individuals entering the academy. An analysis of the authors' shared experiences indicated that, through this mentoring, collaborative and mutually beneficial relationships were built. An analysis of the authors' experiences also indicated that these collaborative relationships were built upon several key factors, specifically (a) a strong sense of individual accountability and professionalism; (b) the mutual creation and demonstration of respect; (c) affirmation and overt participation in reciprocal growth and development; (d) attention to issues of power and abeyance. The findings of the study highlight the need for further exploration into the role of mentorship of junior faculty and the efficacy of co-teaching processes in the development of professional identities of junior faculty entering the academy.

scholarly journals Over 1,000 Years of Contact Between Arabic and the Eastern and Southern African Languages: A Case Study of Kiswahili and Setswana

2018 ◽  
Vol 4 (2) ◽  
pp. 43
Author(s):  
Herman M. Batibo
Keyword(s):  
Southern Africa ◽  
Language Contact ◽  
Arabic Language ◽  
Eastern Africa ◽  
Key Factors ◽  
African Languages ◽  
Arabic Speaking ◽  
Sound Features ◽  
The Impact

Arab travellers and traders along the eastern African coast, more than 1000 years ago, were the first Arabic speaking people to bring Arabic language in contact with the other African languages in eastern and later southern Africa. Over the years, Arabic gained a lot of influence in the region. The impact of Arabic can be seen, especially in old scripts, loanwords, Arabic accents and sound features in some of the local languages.This article examines the nature and extent of contact situations between Arabic and two languages, namely Kiswahili, spoken in eastern Africa, and Setswana, spoken in southern Africa. The study is based on the Language Contact Theory, which states that the nature, length and intensity of language contact are the key factors determining the linguistic and sociolinguistic processes that take place. Contact between languages could be either direct or indirect. The main argument of the study is that the extent of influence of a language on another depends not only on the nature of contact, but also, and mainly, on the length and intensity of contact. The paper highlights the domains in which elements of Arabic origin have infiltrated or been adopted in these languages.

scholarly journals Examining the impact of students’ attendance, sketching, visualization, and tutors experience on students’ performance: a case of building structures course in construction management

2020 ◽  
Vol 20 (3) ◽  
Author(s):  
Fahim Ullah ◽  
Samad Sepasgozer ◽  
Faham Tahmasebinia ◽  
Saleh Mohammad Ebrahimzadeh Sepasgozar ◽  
Steven Davis
Keyword(s):  
Systematic Review ◽  
Construction Management ◽  
Influential Factors ◽  
The Body ◽  
Building Structures ◽  
Key Factors ◽  
Final Exam ◽  
The Impact ◽  
Core Course

The aim of this paper is to examine students’ performance in a computation-based course by evaluating the effects of key factors including sketching, visualization resources provided to them during the lectures, their attendance and tutors’ experience. A systematic review was conducted including 192 articles published during January 2010 to December 2019. Further, a case study has been conducted in which 633 students from non-engineering backgrounds were taught a core course of construction over three-yearly sessions from 2017 to 2019. The performance has been assessed through two quizzes of 10% weight each, assignment of 40% weight and a final exam with 30% weight in 2017-18 and 40% weight in 2019 were utilized with an attendance criterion of below 75% as low attendance. The statistical result highlights that a clear difference of 14% overall marks exist between the students with less than 75% attendance and the ones with 75% and above in 2017 and a 10% gap in 2018. Students with high marks in sketching secured higher overall marks as compared to others highlighting that the sketching skill is useful to construction students. The findings contribute to the body of education knowledge by evaluating key influential factors and provide a useful benchmark to other educators in the field. 

scholarly journals Combined Use of Mathematical Optimization and Design of Experiments for the Maximization of Profit in a Four-Echelon Supply Chain

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-25 ◽  
Author(s):  
Daniel Arturo Olivares Vera ◽  
Elias Olivares-Benitez ◽  
Eleazar Puente Rivera ◽  
Mónica López-Campos ◽  
Pablo A. Miranda
Keyword(s):  
Supply Chain ◽  
Design Of Experiments ◽  
Mathematical Optimization ◽  
Fractional Factorial ◽  
Mixed Integer ◽  
Supply Chain Network ◽  
Distribution Centers ◽  
Cost Component ◽  
Allocation Model

This paper develops a location-allocation model to optimize a four-echelon supply chain network, addressing manufacturing and distribution centers location, supplier selection and flow allocation for raw materials from suppliers to manufacturers, and finished products for end customers, while searching for system profit maximization. A fractional-factorial design of experiments is performed to analyze the effects of capacity, quality, delivery time, and interest rate on profit and system performance. The model is formulated as a mixed-integer linear programming problem and solved by using well-known commercial software. The usage of factorial experiments combined with mathematical optimization is a novel approach to address supply chain network design problems. The application of the proposed model to a case study shows that this combination of techniques yields satisfying results in terms of both its behavior and the obtained managerial insights. An ANOVA analysis is executed to quantify the effects of each factor and their interactions. In the analyzed case study, the transportation cost is the most relevant cost component, and the most relevant opportunity for profit improvement is found in the factor of quality. The proposed combination of methods can be adapted to different problems and industries.

scholarly journals Design of Experiments to Study the Impact of Process Parameters on Droplet Size and Development of Non-Invasive Imaging Techniques in Tablet Coating

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0157267 ◽  
Author(s):  
Thomas J. Dennison ◽  
Julian Smith ◽  
Michael P. Hofmann ◽  
Charlotte E. Bland ◽  
Raj K. Badhan ◽  
...  
Keyword(s):  
Design Of Experiments ◽  
Droplet Size ◽  
Process Parameters ◽  
Imaging Techniques ◽  
Tablet Coating ◽  
Non Invasive ◽  
The Impact

scholarly journals QbD Based Media Development for the Production of Fab Fragments in E. coli

2019 ◽  
Vol 6 (2) ◽  
pp. 29 ◽  
Author(s):  
Deepak Kumar ◽  
Jyoti Batra ◽  
Claire Komives ◽  
Anurag Rathore
Keyword(s):  
Product Quality ◽  
Process Parameters ◽  
Basal Medium ◽  
Fractional Factorial ◽  
Age Related Macular Degeneration ◽  
Expression Level ◽  
Maximum Effect ◽  
Manufacturing Cost ◽  
Fab Fragment ◽  
The Impact

Ranibizumab is a biotherapeutic Fab fragment used for the treatment of age-related macular degeneration and macular oedema. It is currently expressed in the gram-negative bacterium, Escherichia coli. However, low expression levels result in a high manufacturing cost. The protein expression can be increased by manipulating nutritional requirements (carbon source, nitrogen source, buffering agent), process parameters (pH, inducer concentration, agitation, temperature), and the genetic make-up of the producing strain. Further, understanding the impact of these factors on product quality is a requirement as per the principles of Quality by Design (QbD). In this paper, we examine the effect of various media components and process parameters on the expression level and quality of the biotherapeutic. First, risk analysis was performed to shortlist different media components based on the literature. Next, experiments were performed to screen these components. Eight components were identified for further investigation and were examined for their effect and interactions using a Fractional Factorial experimental design. Sucrose, biotin, and pantothenate were found to have the maximum effect during Fab production. Furthermore, cyanocobalamin glutathione and biotin-glutathione were the most significant interactions observed. Product identification was performed with Liquid Chromatography–Mass Spectrometry (LC-MS), the expression level was quantified using Bio-layer Interferometry, Reverse Phase-HPLC, and SDS-PAGE, and product quality were measured by RP-HPLC. Overall, a five-fold enhancement of the target protein titer was obtained (from 5 mg/L to 25 mg/L) using the screened medium components vis-a-vis the basal medium, thereby demonstrating the efficacy of the systematic approach purported by QbD.

Process Design for the Manufacturing of Magnetic Pulse Welded Joints

2011 ◽  
Vol 473 ◽  
pp. 243-250 ◽  
Author(s):  
Verena Psyk ◽  
G. Gershteyn ◽  
Bjoern Barlage ◽  
Christian Weddeling ◽  
Bibiana Albuja ◽  
...  
Keyword(s):  
Process Parameters ◽  
Process Design ◽  
Model Experiment ◽  
Dissimilar Materials ◽  
Surface Preparation ◽  
Magnetic Pulse ◽  
Promising Alternative ◽  
Joint Properties ◽  
Impact Parameters ◽  
The Impact

When manufacturing joints of dissimilar materials thermal technologies as welding reach their limits. Impact welding by electromagnetic forming is a promising alternative because undesired heating of the parts and related disadvantages are avoided. In this process impact parameters need to be adjusted to each specific joining task, but cannot be settled directly. Thus, a two-step methodology is suggested for the process design: First the influence of the impact parameters and the surface preparation on the joint properties is investigated using a model experiment. Joint properties are characterized by metallographic investigations. Parallel to this, the influence of the adjustable process parameters and the equipment on the workpiece acceleration and the impact properties is analyzed. Then the results of both investigation paths are combined and conclusions regarding a target-oriented adjusting of the impact parameters via the process parameters are drawn. In the paper first results considering the model experiment and the analysis of the electromagnetic expansion process are presented and joints manufactured by electromagnetic expansion are characterized.

scholarly journals A Case Study of Inventory Management in a Manufacturing Company in China

2016 ◽  
Vol 5 (1) ◽  
pp. 20-40 ◽  
Author(s):  
Hong Shen ◽  
Qiang Deng ◽  
Rebecca Lao ◽  
Simon Wu
Keyword(s):  
Inventory Management ◽  
Management Practices ◽  
Key Factors ◽  
Case Study Approach ◽  
Study Approach ◽  
Manufacturing Company ◽  
Practical Guidance ◽  
Management Approaches ◽  
The Impact

Abstract In this paper, we focus on inventory management in a manufacturing company in China. This study aims to identify the key factors that influence inventory management practices, investigate efficient and effective inventory management approaches, and examine the impact of supplier cooperation on supply chain improvement. A case study approach is used to identify the key factors that influence inventory management in a factory. Efficient and effective inventory management practices are derived from the case study and may provide practical guidance for foreign manufacturers in China. This study provides a valuable tool for identifying the key factors in inventory management which can be applied to similar problems encountered in actual manufactories.

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