scholarly journals Biobjective Scheduling for Joint Parallel Machines with Sequence-Dependent Setup by Taking Pareto-Based Approach

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Wichai Srisuruk ◽  
Kanchala Sudtachat ◽  
Paramate Horkaew
Keyword(s):  
Parallel Machines ◽  
Just In Time ◽  
Manufacturing Cost ◽  
Large Problem ◽  
Manufacturing Costs ◽  
Delivery Delay ◽  
Optimal Resource ◽  
Product Delivery ◽  
Work Hour ◽  
Machine Utilization

Modern factories have been moving toward just-in-time manufacturing paradigm. Optimal resource scheduling is therefore essential to minimize manufacturing cost and product delivery delay. This paper therefore focuses on scheduling multiple unrelated parallel machines, via Pareto approach. With the proposed strategy, additional realistic concerns are addressed. Particularly, contingencies regarding product dependencies as well as machine capacity and its eligibility are also considered. Provided a jobs list, each with a distinct resource work hour capacity, this novel scheduling is aimed at minimizing manufacturing costs, while maintaining the balance of machine utilization. To this end, different computational intelligence algorithms, i.e., adaptive nearest neighbour search and modified tabu search, are employed in turn and then benchmarked and validated against combinatorial mathematical baseline, on both small and large problem sets. The experiments reported herein were made on MATLAB™ software. The resultant manufacturing plans obtained by these algorithms are thoroughly assessed and discussed.

Upper-Extremity Prostheses: A Renewed Approach

2009 ◽  
Author(s):  
Alwyn P. Johnson ◽  
Bradley Veatch
Keyword(s):  
Upper Extremity ◽  
Galvanic Corrosion ◽  
The United States ◽  
Manufacturing Cost ◽  
Heavy Duty ◽  
Axial Loads ◽  
Manufacturing Costs ◽  
Ongoing Development ◽  
Universal Interface ◽  
And Function

Upper-extremity (UE) prostheses are increasingly more functional and proportionately more costly, rendering them largely unattainable for impoverished amputees in the United States (US) and abroad. Recognizing the increasing need for appropriate devices, PhysioNetics, LLC is developing a heavy-duty, transradial body-powered (BP) UE prosthesis which can be prescribed with minimal instruction. The design of the key components, the split-hook terminal device [TD] and universal adjustable interface is presented in this paper. The TD is primarily fabricated from plastics to eliminate galvanic corrosion in saltwater environments, weighs 5.4 oz (153 g) and uses inexpensive rubber bands to generate pinch force. Unique gripping contours provide versatile grasp and replicate five (5) prehension patterns while six (6) discrete force settings provide 2 – 17 lbf (8.9 – 76 N) of pinch. Three (3) universal interface sizes (small, medium, and large) accommodate most amputees and comfortably support axial loads up to 40 lbf (178 N). Estimated manufacturing cost for a complete unit is less than US$250. Field testers report lower but comparable comfort to their individually custom-fabricated interfaces, and are highly satisfied with fit and function of the prosthesis overall. Ongoing development includes reduction of manufacturing costs, increasing interface comfort and implementing task-specific variant designs.

A search heuristic for just-in-time scheduling in parallel machines

1991 ◽  
Vol 2 (4) ◽  
pp. 253-260 ◽  
Author(s):  
Manuel Laguna ◽  
Jos� Luis Gonz�lez Velarde
Keyword(s):  
Parallel Machines ◽  
Just In Time ◽  
Search Heuristic ◽  
Time Scheduling

Consumer Preferences for Service Recovery Options After Delivery Delay When Shopping Online

2012 ◽  
Vol 40 (6) ◽  
pp. 1033-1043 ◽  
Author(s):  
Dong-Shang Chang ◽  
Tao-Hsing Wang
Keyword(s):  
Cluster Analysis ◽  
Consumer Preferences ◽  
Service Recovery ◽  
Response Speed ◽  
Delivery Delay ◽  
Internet Users ◽  
Recovery Strategies ◽  
Product Delivery ◽  
Attribute Levels ◽  
Preference Structures

We identified the key attributes of service recovery for product delivery delays when shopping online and elucidated the preference structures of consumers regarding these attributes. A conjoint analysis was conducted using a sample of 201 Internet users; and we found that the 4 most critical attributes of service recovery were: compensation, response speed, apologies, and contact channels. We used a part-worth utility of attribute levels as segmentation variables and conducted a cluster analysis to group the respondents, and to distinguish preferences across various consumer segments. Our findings can serve as a reference for e-retailers when developing service recovery strategies for delayed product delivery.

scholarly journals Modifikasi Alat Pemintal Benang Sutera Untuk Industri Rumah Tangga

2019 ◽  
Vol 17 (1) ◽  
pp. 101
Author(s):  
Abdul Salam ◽  
Muh Iswar ◽  
Bensar Pali ◽  
Agustinus Anggai ◽  
Janchristo Rantemangnga
Keyword(s):  
Data Collection ◽  
Performance Testing ◽  
Design Tool ◽  
Manufacturing Cost ◽  
Basic Design ◽  
Manufacturing Costs ◽  
Testing Tools ◽  
Manufacturing Performance ◽  
Equipment Manufacturing ◽  
Silk Yarn

This study aims to determine the yarn spinning time, spinning equipment manufacturing costs, and haspel shaft spinning. Basic design is done by data collection, direct visits to the silk farmers' groups, tool design, tool manufacturing, performance testing tools, analysis, calculating costs and tool manufacturing. In accordance with the testing of the spinning machine, the total working time is 8 hours / day for 3.36 kg of silk yarn, the spinning equipment manufacturing cost is Rp. 5,102,534.71. Whereas BEP is achieved when the sale of spinning machines is at least 1 unit / month or when income is Rp. 5,621,064. 

Managing the Supply Chain

1987 ◽  
Vol 201 (4) ◽  
pp. 251-255 ◽  
Author(s):  
F Turner
Keyword(s):  
Lead Time ◽  
Minimum Cost ◽  
Just In Time ◽  
Lead Times ◽  
Manufacturing Cost ◽  
British Industry ◽  
Supplier Chain ◽  
Technology Industries ◽  
High Technology Industries ◽  
Quality Production

Much effort has been directed to the reduction of cost, reduction of lead-time and reduction of inventory within factories. However, in most high-technology industries a greater proportion of the manufacturing cost is associated with the products and materials supplied from the supplier network. It is therefore vitally important that the very same disciplines, controls and philosophies that apply in-house to manufacture on time, at minimum cost with minimum working capital, are applied to the components, materials and services supplied from outside the industry. This paper reviews the actions necessary in order to ensure that the supplier chain is managed with maximum effectiveness for quality production, minimum cost, with secure lead-times and delivery. The paper reviews the importance of supplier involvement in the influence of design details, working to ‘should costs’, sealing of manufacturing methods and also a commitment to just-in-time delivery, as well as just-in-time manufacture. The paper concludes with the declaration that the competitiveness of British industry largely depends on how the larger companies contribute to the international competitiveness of their suppliers.

Tolerance modelling and robust design for concurrent engineering

2007 ◽  
Vol 221 (4) ◽  
pp. 455-465 ◽  
Author(s):  
J Hu ◽  
Y Peng
Keyword(s):  
Robust Design ◽  
Concurrent Engineering ◽  
Manufacturing Cost ◽  
Functional Requirements ◽  
Manufacturing Costs ◽  
Tolerance Optimization ◽  
Geometric Tolerances ◽  
Genetic Arithmetic ◽  
Tolerance Modelling ◽  
Tolerance Model

This article presents a tolerance modelling and robust design approach to support concurrent engineering. This method allows the designer to synthetically specify dimensional and geometric tolerance, considering assembly functional requirements (AFRs) and manufacturing costs. First, features of ISO/TC 213 are used as the basis for the construction of tolerance network and tolerance model for assembly. Second, the manufacturing cost-tolerance model for cylindrical and planar features is established. This model addresses not only dimensional tolerances but also geometric tolerances and nominal parameters. Finally, the robust tolerance optimization model is established, and genetic arithmetic is used to obtain robust tolerance values. The proposed approach is consistent with the philosophy of concurrent engineering, in which AFRs are satisfied and manufacturing cost is reduced. A design instance is introduced to show the validity of this method.

Design for Injection Molding: Balancing Mechanical Requirements, Manufacturing Costs, and Material Selection

1995 ◽  
Author(s):  
Kurt A. Beiter ◽  
James M. Cardinal ◽  
Kos Ishii
Keyword(s):  
Cycle Time ◽  
Material Selection ◽  
Performance Measure ◽  
Production Costs ◽  
Manufacturing Cost ◽  
Manufacturing Costs ◽  
Time Estimates ◽  
Current Implementation ◽  
Molded Parts ◽  
Design Selection

Abstract This paper describes a procedure for considering mechanical requirements, manufacturing costs, and material selection in the design of injection molded parts. The benefit of this approach is the simultaneous consideration of the implications of material selection and part geometry on estimated manufacturing cost during candidate design selection. The current implementation uses the allowable deflection of a flat plate as an example performance measure. Manufacturability concerns include required part thickness and gating scheme to adequately mold the part, and a resulting cycle time based on part cooling time estimates. Part manufacturing cost includes material cost, cycle time, and production costs. A PC-based and CAD-integrated program illustrate our proposed procedure.

Optimum tolerance synthesis of simple assemblies with nominal dimension selection using genetic algorithm

2016 ◽  
Vol 230 (19) ◽  
pp. 3488-3508 ◽  
Author(s):  
D Vignesh Kumar ◽  
D Ravindran ◽  
M Siva Kumar ◽  
MN Islam
Keyword(s):  
Genetic Algorithm ◽  
Vital Role ◽  
Tolerance Allocation ◽  
Manufacturing Cost ◽  
Test Results ◽  
Manufacturing Costs ◽  
Critical Dimensions ◽  
Optimal Adjustment ◽  
Selection Of ◽  
Nominal Dimension

Optimum tolerance allocation plays a vital role in minimization of the direct manufacturing cost, and it is sensitive to tolerances related to variations in manufacturing processes. However, optimal adjustment of both nominal dimensions and selection of tolerances may further reduce assembly manufacturing cost and wastage of materials during processing. Most studies in existing literature focus on optimum tolerance allocation for the assemblies without considering nominal dimension selection. The method proposed in this work uses genetic algorithm techniques to allocate tolerances to assembly components, thereby minimizing costs. The component alternate nominal dimensions are predicted based on critical dimensions and its tolerances. The effectiveness of the developed algorithms demonstrated using randomly generated problems as well as sample problems taken from the literature. Test results are compared with those obtained using the Lagrange multiplier method. It is shown that by adjusting the nominal dimensions, the proposed method yields considerable savings in manufacturing costs.

Analysis of manufacturing cost and market niches for Cu2ZnSnS4 (CZTS) solar cells

2021 ◽  
Vol 5 (4) ◽  
pp. 1044-1058
Author(s):  
Ao Wang ◽  
Nathan L. Chang ◽  
Kaiwen Sun ◽  
Chaowei Xue ◽  
Renate J. Egan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Cost Reduction ◽  
Manufacturing Cost ◽  
Manufacturing Costs ◽  
Cost Drivers ◽  
Potential Market ◽  
Reduction Strategies

The manufacturing costs of CZTS with different substrates, major cost drivers, and cost reduction strategies are analyzed. Potential market niches of CZTS products and techno-economic requirements for CZTS commercialization are explored.

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