A load spectra design method for multi-stress accelerated testing

2021 ◽  
pp. 1748006X2110620
Author(s):  
Zhonghai Ma ◽  
Songlin Nie ◽  
Haitao Liao
Keyword(s):  
Life Stress ◽  
Design Method ◽  
Critical Issue ◽  
Accelerated Testing ◽  
Multiple Stresses ◽  
Load Spectra ◽  
Working Environments ◽  
Actual Working ◽  
Loading Matrix

Accelerated testing (AT) is an effective testing method for evaluating the reliability of highly reliable products. In many applications, such products are often subject to multiple stresses in actual working environments. Then, how to design the load spectra for multi-stress AT becomes a critical issue. In this paper, a new load spectra design method is proposed to overcome this challenge. Considering the properties of multiple stresses, a novel multi-stress loading matrix (MSLM) is modified to fully describe the load spectra in actual working environments and to generate the corresponding load spectra for AT. For illustration purposes, an inverse Gaussian (IG) process incorporating life-stress relationships is adopted to model product degradation under multiple stresses. A case study on a type of hydraulic piston pump is provided to demonstrate the use of the proposed method in guiding the load spectra design for multi-stress AT.

PERANCANGAN SISTEM PEMBELAJARAN MOBILE (M-LEARNING) BERBASIS ANDROID PADA MATERI BANGUN DATAR DAN BANGUN RUANG

2018 ◽  
Vol 1 (2) ◽  
pp. 1-17
Author(s):  
Tedi Budiman
Keyword(s):  
Mobile Learning ◽  
Design Method ◽  
Case Study Method ◽  
Application Development ◽  
Software Application ◽  
Rapid Application Development ◽  
User Design ◽  
Design Software ◽  
Application Programs

One example of the growing information technology today is mobile learning, mobile learning which refers to mobile technology as a learning medium. Mobile learning is learning that is unique for each student to access learning materials anywhere, anytime. Mobile learning is suitable as a model of learning for the students to make it easier to get an understanding of a given subject, such as math is pretty complicated and always using formulas.The design method that I use is the case study method, namely, learning, searching and collecting data related to the study. While the development of engineering design software application programs that will be used by the author is the method of Rapid Application Development (RAD), which consists of 4 stages: Requirements Planning Phase, User Design Phase, Construction Phase and Phase Cotuver.

scholarly journals Reservoir Sediment Management Using Artificial Neural Networks: A Case Study of the Lower Section of the Alpine Saalach River

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 818
Author(s):  
Markus Reisenbüchler ◽  
Minh Duc Bui ◽  
Peter Rutschmann
Keyword(s):  
Real World ◽  
Close Correlation ◽  
Critical Issue ◽  
Management Tool ◽  
Lower Section ◽  
Reservoir Sediment ◽  
Efficiency And Effectiveness ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

Reservoir sedimentation is a critical issue worldwide, resulting in reduced storage volumes and, thus, reservoir efficiency. Moreover, sedimentation can also increase the flood risk at related facilities. In some cases, drawdown flushing of the reservoir is an appropriate management tool. However, there are various options as to how and when to perform such flushing, which should be optimized in order to maximize its efficiency and effectiveness. This paper proposes an innovative concept, based on an artificial neural network (ANN), to predict the volume of sediment flushed from the reservoir given distinct input parameters. The results obtained from a real-world study area indicate that there is a close correlation between the inputs—including peak discharge and duration of flushing—and the output (i.e., the volume of sediment). The developed ANN can readily be applied at the real-world study site, as a decision-support system for hydropower operators.

Design and Evaluation of Usable Systems

2002 ◽  
Vol 46 (3) ◽  
pp. 367-371
Author(s):  
John F. McGrew
Keyword(s):  
Genetic Algorithm ◽  
Change Management ◽  
Management System ◽  
Design Method ◽  
The Other ◽  
Design Team ◽  
Style Analysis ◽  
Decision Style ◽  
Parallel Design

This paper discusses a case study of a design and evaluation of a change management system at a large Telecommunications Corporation. The design and evaluation were done using the facilitated genetic algorithm (a parallel design method) and user decision style analysis. During the facilitated genetic algorithm the design team followed the procedure of the genetic algorithm. Usability was evaluated by applying user decision style analysis to the designed system. The design is compared with an existing system and with one designed by an analyst. The change management system designed by the facilitated genetic algorithm took less time to design and decision style analysis indicated it would be easier to use than the other two systems.

CAFixD: A Case-Based Reasoning Fixture Design Method. Framework and Indexing Mechanisms

2005 ◽  
Vol 6 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Iain M. Boyle ◽  
Kevin Rong ◽  
David C. Brown
Keyword(s):  
Design Method ◽  
Critical Issue ◽  
Design Solution ◽  
Case Based Reasoning ◽  
Fixture Design ◽  
Functional Requirements ◽  
Rigorous Approach ◽  
Machining Operations ◽  
Case Based ◽  
Individual Requirement

Fixtures accurately locate and secure a part during machining operations. Various computer-aided fixture design (CAFD) methods have been developed to reduce design costs associated with fixturing. One approach uses a case-based reasoning (CBR) method where relevant design experience is retrieved from a design library and adapted to provide a new design solution. Indexing design cases is a critical issue in CBR, and CBR systems can suffer from an inability to distinguish between cases if indexing is inadequate. This paper presents CAFixD, a CAFD methodology that adopts a rigorous approach to defining indexing attributes based upon axiomatic design functional requirement decomposition. A design requirement is decomposed in terms of functional requirements, physical solutions are retrieved and adapted for each individual requirement, and the design is then reconstituted to form a complete fixture design. This paper presents the CAFixD framework and operation, and discusses in detail the indexing mechanisms used.

Judgment Method of Accelerated Testing Effects on Compound Friction Material

2013 ◽  
Vol 750-752 ◽  
pp. 76-80
Author(s):  
Shi Meng Xu ◽  
Run Bo Ma ◽  
Jian Hua Du ◽  
Jun Hong Liu ◽  
Qi Jin
Keyword(s):  
Design Method ◽  
Block Design ◽  
Friction Material ◽  
Accelerated Life Testing ◽  
Accelerated Testing ◽  
Experiment Data ◽  
Testing Effects ◽  
Accelerated Life ◽  
Distribution Laws ◽  
Basic Statistical Analysis

For an copper-based composite friction material the accelerated testing effects was judged under three kinds of testing stress in this paper, that was, through the block design method and analysis, the forthright and functional judging method was given in certain extent for the accelerated testing designed by this paper. Meanwhile, the both methods about basic statistical analysis and basic accelerated life testing was used for discussing the statistical distribution laws on the experiment data which that the copper-based composite friction material were under three kinds of testing stress.

Learning together and working apart: routines for organizational learning in virtual teams

2017 ◽  
Vol 24 (3) ◽  
pp. 138-149 ◽  
Author(s):  
Nancy Dixon
Keyword(s):  
Organizational Learning ◽  
Virtual Teams ◽  
Virtual Team ◽  
Critical Issue ◽  
Future Research ◽  
Information Industry ◽  
Content Type ◽  
Face To Face ◽  
Virtual Teaming

Purpose Research suggests that teaming routines facilitate learning in teams. This paper identifies and details how specific teaming routines, implemented in a virtual team, support its continual learning. The study’s focus was to generate authentic and descriptive accounts of the interviewees’ experiences with virtual teaming routines. Design/methodology/approach This case study gathered concrete, practical and context-dependent knowledge about virtual teaming routines in a specific environment. The main source of data was narrative expert interviews with working members of the team. Findings This study illustrates how a mix of face-to-face and virtual routines can ensure organizational learning in virtual teams. Research limitations/implications This case study is limited to one virtual team in the information industry. Future research could build on this research to study virtual teams in other industries. Practical implications This research offers specific examples of teaming routines that managers of virtual teams might adapt in managing their own teams. Social implications Given that the use of virtual teams is a growing phenomenon, understanding how to help those teams learn effectively is a critical issue. Originality/value This case study extends the research on teaming routines to virtual teams.

scholarly journals Designing in Architecture: Behavioral Approach Methodology

2018 ◽  
Vol 7 (3.27) ◽  
pp. 142
Author(s):  
Sri Astuti Indriyati ◽  
. .
Keyword(s):  
Human Behavior ◽  
Architectural Design ◽  
Design Methodology ◽  
Design Method ◽  
Coping Behavior ◽  
Behavioral Approach ◽  
Employee Productivity ◽  
Specific Design ◽  
New Guidelines

A fundamental premise on environmental and behavioral fields involves assumptions about the systematic interrelationships between architecture and patterns of human behavior. The case study conducted was to confirm the needs of specific design methodology in relations to the area of Perception and Human Behavior. The research focused to the extent to which Office Space Performance gives impact on Employee Productivity and Satisfaction. Following that, It was also seen how those affect the behavior of coping. The findings show that there is a significant impact of Spaces’ Performances on Space Satisfaction. Further, there is a significant impact of Space Satisfaction on Coping Behavior and also a significant impact of Spaces’ Performances against Coping behavior. Humanist architecture with architectural behavior approach is required as a Concept of Planning and Architectural Design in the Future. A New Guidelines for Planning and Architectural Design Method for Architectural Design with Behavior concerns is proposed.   

scholarly journals "Walking the Walk”: Promoting Competencies for Interprofessional Learning through Team Meetings—A Case Study

2014 ◽  
Vol 4 (2) ◽  
Author(s):  
Matthew Links
Keyword(s):  
Professional Learning ◽  
Interprofessional Education ◽  
Core Competencies ◽  
Critical Issue ◽  
Interprofessional Learning ◽  
Team Meetings ◽  
Explicit Consideration ◽  
Professional Meeting ◽  
Learning Competencies

Background: Interprofessional learning is a key aspect of improving team-based healthcare. Core competencies for interprofessional education (IPE) activities have recently been developed, but there is a lack of guidance as to practical application. Methods and Findings: Cancer Forum is a weekly multi-professional meeting used as the case study for this report. Power was identified as a critical issue and six questions were identified as the basis for a structured reflection on the conduct of Cancer Forum. Results were then synthesised using Habermas’ delineation of learning as instrumental, normative, communicative, dramaturgical, and emancipatory. Power was a key issue in identified obstacles to inter professional learning. Leadership emerged as a cross-cutting theme and was added as a seventh question. The emancipatory potential of interprofessional learning benefited from explicit consideration of the meeting agenda to promote competencies of sharing role knowledge, teamwork and communication. Modelling of required skills fulfils a dramaturgical and normative role. Conclusions: The structured reflection tool highlighted the relationship between power and IPE competencies. It was essential to walk the walk as well as talk. The process followed provides a practical guide for using team meetings to promote interprofessional learning competencies and thereby improving patient care.

scholarly journals Improving Daylight Availability in Heritage Buildings: A Case Study of Below-grade Classrooms in Tehran

2021 ◽  
Vol 8 (1) ◽  
pp. 120-133
Author(s):  
Kamyar Soleimani ◽  
◽  
Nastaran Abdollahzadeh ◽  
Zahra Sadat Zomorodian ◽  
◽  
...  
Keyword(s):  
Energy Demand ◽  
Critical Issue ◽  
Natural Light ◽  
Classroom Space ◽  
Educational Spaces ◽  
Visual Tasks ◽  
Heritage Buildings ◽  
Heritage Building ◽  
Daylight Performance

Refurbished heritage buildings usually lack in meeting the required standards defined for the new function especially when reused as educational buildings. Therefore, they are usually equipped with different post-occupancy retrofit strategies to achieve an acceptable level of environmental quality and energy demand. Daylight quality and the distribution of natural light is a critical issue in educational spaces, given that the low level of illuminance in classrooms can decrease students' performance and disrupt visual tasks. In this study, daylight performance of below-grade south-facing classrooms in a heritage building in Tehran, Iran is investigated by implementing 57 different daylighting retrofit strategies using climate-based daylight simulations, in relation to the metric Useful Daylight Illuminance 300-3000lux (UDI-Autonomous). The research proposes the use of reflectors on the interior ceiling and exterior side of the windows (on the ground) to achieve the highest result possible. Although, applying these two systems individually, can boost the spatial distribution of daylight to 75 % and 71%, respectively, the combination of them provide users with UDI-Autonomous in 99% of the classroom space for more than half of the occupancy time.

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