Production/Operations Management - Science topic
Explore the latest questions and answers in Production/Operations Management, and find Production/Operations Management experts.
Questions related to Production/Operations Management
Using heuristic algorithms, I'm studying solution methods for various flow-shop scheduling problems. Each method generates an optimal job sequence. With this job sequence, we get the total elapsed time or makespan. However, for an n-jobs and m-machine flow-shop scheduling problem, manually determining the makespan and creating the Gantt chart is quite tedious.
Could you suggest any software or tools to generate the Gantt chart and to determine the makespan (total elapsed time) of an optimal job sequence for a flow-shop scheduling problem?
Looking forward to your precious suggestions. Thank you!
Textbooks about the managerial aspects of Digital Transformation and Industry 4.0 for academic teaching with exercises and case studies.
As research on systems for drone delivery of small packages continue, a possible urban asset to successfully leverage is the network of natural and man-made drainage in metro areas. This inventory would include streams, waterways, canals, gullies, rivers. Has there been any empirical work been done on utilising these networks for commercial delivery of packages by drones.
MICLASS and DCLASS coding system in group technology follow which type of coding: monocode, polycode or mixcode? Why Opitz classification and coding system is a mixed code. I can understand that there is the feature of polycode, but I cannot find any feature of monocode or hierarchical order in Opitz coding system.
In the laboratory I’m working at, we are conducting a research about Lean tools use in each phase of DMAIC method. It would be very important for me if you can help me by answering the following survey.
It would take you no more than 5mins.
You can access in the following link:
I am currently testing a model that involves cross-level interactions. The dependent variable (corporate financial performance, a formative scale) and the independent variable (corporate sustainability performance, a formative scale) are measured at the firm level, and the moderator is a country-level variable. What software and/or statistical package can evaluate this model? I feel that I need a tool that combines the strengths of PLS and HLM.
I need an article, paper, book, etc. for mixed or multi-model of assembly line problem. However, any article related to multi-objective ALBP is very useful for me too.
Obviously, the difference between the mixed model and the multi-model line is the batch sizes defined for various types of products in multi-model ALB.
if you sell umbrella, you have two season, one where is high seasonal demand and the other one is the low seasonal demand. How do you estimate when and how much the optimal order quantity is, if you know the one season will be end soon, so u know u cant sell all product (assume the amount is as large as EOQ) on the season, and the remain must be sold on the next season?
In CRS model, the input and output oriended objective function values are reciprocal to each others. But why not in VRS?
What are the differences among flexible manufacturing system (FMS), computer integrated manufacturing (CIM) and totally integrated automation (TIA)?
Which is not an essential requirement of JIT purchasing?
(i) Stable relation with vendor
(ii) Simple purchase agreement
(iii) Timely exact quantity delivery
(iv) Specifying all conceivable design features
In which phase [Initiation, Planning/Design Phase, Execution and Closing] of a project, project appraisal is conducted to accept or reject a project?
Which of the following is not a component of inventory carrying cost?
i) capital cost
ii) transportation cost
iii) insurance cost
iv) obsolescence cost.
I am looking for any articles focused in the topic of Scheduling in Hybrid Flow Shop systems, using Ant Colony techniques. Also, if anyone have any articles in this matter that include the scheduling of systems that involve Make to Stock and Make to order products.
I would like some advice and hopefully references to papers or other sources that have researched warranty or failure forecasting methods.
Especially when a current component is replaced by a new. Event and warranty history of the current component is available. What possibilities are existing in the research/applied community ?
I'm particularly interested in applications in the automotive domain, however general advice is appreciated as well.
We have many assumptions when we optimize the production scheduling based on the flow shop sequence model, and omit an important factor about human beings. The schedule may not turn out as we planned due to the thinking and behaviors of labors or managers. I want to consider the impacts of human but have no idea about the methods. Could anyone provide some suggestions or related publications? thanks!
Interesting project - reminds me of the problems I faced when forecasting sales when scheduling production - there I tried to do several things to reduce the impact of uncertainty.
1. Apply effort to reduce the uncertainty associated with the most important items.
2. Separate uncertainty into those where I could improve my knowledge of the item (sales trends and seasonality) and where I could not improve my knowledge ("random" fluctuations due to weather etc.)
3. Improve "agility" appropriately (so as to speed response) when actuals differed significantly from forecast - holding inventory at a sub assembly level, buffer stocks.
4. Flag and investigate situations where the actual was an outlier - such as a customer changing the product that it bought routinely (despite sale saying that this was a purely random blip!!).
Also, I think that the quality management knowledgebase may be a good source of ideas.
I have the maintenance cost for each individual HEMMs. I want to know if I can use simple moving average, weighed moving average or exponential smoothing methods to calculate maintenance cost for future projects and also to decide whether it will be more profitable to go with old vehicles or buy new ones.
We have a Mixed-Integer Non-Linear Problem with square root components on the decision variables. I have seen a proposal to reformulate as a Conic Quadratic problem, but I am not sure if this reformulation guarantees optimality with respect to the original problem.
National Furniture Company (NFC) is the manufacturer of home and office furniture. Currently they are in financial crisis and after an inquiry it was found that the problem occurred due to inaccurate demand forecast. The sales manager, who is responsible for the demand forecast was also contacted for explanation. At the other hand sometimes organizations have to spend huge money in holding the inventory which ultimately brings losses to the company.
I search the way to make one complex parameter for significant impact of new production equipment: investment cost of machines and tools, quality, throughput, capacity scalability, number of product types, system conversion time, stability, maintenance, ...
I would be glad to find out other existing Procedure or Ideas.
Are there any references for this topic.
I am analysing the route that spare parts follow in a manufacturing plant, and I should determine the costs deriving both with availability (i.e. stock costs in warehouse) and unavailability (i.e. the costs caused by the lack of the products themselves)
The total cost should comprehend both the two costs (stored and missing materials), but the second term is particularly difficult to identify.
Could you please suggest me an approximate way to calculate it? Is there a correlation, for example in terms of percentages of the unitary cost?
Than you in advance
Hi, good day to all ResearchGate members,
I would like to know how to calculate the time covariate in cox regression.
My data is about companies which produced product A and product B. The time of production of product A/B is different for each of the companies. These companies are subsequently default/distress after the production of product A/B. I selected the default/distress time as the 'death time'. Then later I collected the data 5 years backward, i.e. 5 years before the 'death time' for observation period. Within this 5 years of observation, there are companies which produced the product at year 5th ,4th and 3rd. In other words, some companies have observation 2 years before 'death', some with 3 years of observation and so on. How to calculate the time covariate then? And how to set up the data in excel?
I hope my explanation is clear. Appreciate your feedback.
This question is about naming.
I am struggling to find out whether a name exists within the field of operations management research in order to address such an "approach" explained as follows:
- you have a production system (even a simple equipment) as your base case (let's call it BC);
- you plan to invest in a new configuration of your production system, or simply to change its operations --> you model one or more possible design alternatives (let's call them C1, C2, etc)
- you define the performance indicators you will use to compare BC, C1, C2 (can be economic, environmental ones)
- you model how these systems may work, calculate the indicators and compare the alternatives.
Any references, if well-connected to this topic, are most welcome.
Thank you in advance
There is a problem with simultaneous variation of the structure (production equipment) and variation of parameters for each equipment (variation of processing time, reducing time of services, Increasing of priority of working place, ...) by using Design of Experiments .
My suggestion is that we first varies structure in dependence of production cost and achieved annual production. After that we choose best ranked structures for process of parametric optimization.
I would be glad to find out other Procedure or Ideas.
Are there any references for this topic.
Especially in the Moissac - Montauban region in south-west France, there is a significant fruit hub. For example, Tarn&Garonne is one of the major region for apple production in Europe and welcome the biggest apple exporter in France, Blue Whale.
I know general papers about F&V supply chains in Europe, like recent European Parliament paper by Bijman, but I know no study focused on south-west France supply chains.
Currently, I am teaching a subject about operations management and I have to introduce to my students the importance of safety stocks and the different ways to determine it. At this point, I was analyzing how this issue is explained in operations management books, and I realized that some of them compute the safety stock on the basis of the lead time demand distribution (Heizer and Render, 2008), whereas books more specialized in inventory management (Silver et al, 1998) and (Nahmias, 2004), they suggest to use the lead time forecast demand error distribution.
I think that we should use the lead time forecast demand error, what do you think?
- the impact assessment occurs within the design stage of the system
- for "production system" I mean not only whichever manufacturing system, but also systems for end-of-life processes (e.g. disassembly, recycling)
- the impact is with respect to sustainability, hence, economy, environment and society.
I would like to conduct empirical research on the effectiveness of certain operational practices on the different quality dimensions: production quality, product quality, product reliability etc. Does anyone know a validated construct that could be used?
Thanks a lot for your help!
Advances in different areas are often offloaded into education. One concept that is currently being peddled in different areas is lean management. Outside of theorising, are there specific areas in which the principles of lean management can benefit education? Do the central principles of lean management converge with the goals of education or do they stand divergent to it? Does it bring a one size fits all scenario? Please let's have your views
For ex: according to literature
Economic dependency between units implies that performing maintenance on several units at the same time costs less money and/or requires less time than dealing with each unit separately.
while Structural dependency refers to systems where several units form an integral part, so that maintenance of a failed unit also demands the treatment of other units in the part.
is structural dependency not economical?
Many researchers argue that EDI (i.e. Electronic Data Interchange) technology does not provide flexibility, arguing that EDI is out of date technology. To what extent is this claim valid? To which industry sector to this valid? What is the alternative?
Generally for service level calculations most of the papers used cu/cu+co.
I felt it is applicable to only stochastic problems. Can we use this formula for a deterministic problem?
A newsvendor simultaneously faces two risks - that of stockout and excess stock. A newsvendor who orders less than optimum is averse to having excess stocks but is taking risks of stockouts. Similarly ordering more than optimal could mean being risk averse towards stockouts but risk taking towards excess stocks. How should then a risk averse newsvendor be defined?
People in business and research scholars are familiar with the term “economies of scale.” But in the present era of chaotic competition, It is now believed that this term is largely being replaced by the term, “economies of scope.” I wish to know all the possible and detailed features of the term “economies of scope” and how it actually works.
It is believed that in the sphere of production system the paradigm is shifting from Fordism to post-Fordism, but a full comprehension of this concept is not quite clear. What all are the features of the Post-Fordist production system, and why is it also called Toyotism or flexible specialization? Any suggestions?
Hello, I am searching for mathematical equations expressing processing time (and quality) as variable dependent on the load (jobs/resources) and overwork (fatigue) in the system, i.e. as load increases operators speed up (or cut corners with an impact on quality); if high levels of load are maintained for a longer period, fatigue sets in, thus operators lower their speed (bellow normal levels) and quality (potentially) deteriorates as well.
Relevant papers found so far:
- KC, Diwas and Christian Terwiesch. 2009. "Impact of Work Load on Service Time and Patient Safety: An Econometric Analysis of Hospital Operations," Management Science. 55(9) 1486-1498, -> the authors build regressions models of processing time and quality (difficult to replicate given the number of observations required)
- Cutting Corners and Working Overtime: Quality Erosion in the Service Industry
Authors: Rogelio Oliva, John D. Sterman, Management Science, 47(7), July 2001, 894-914-> system dynamic model based on more than 30 equations
I am just asking about, "Suppose we have a production line that consists of 12-14 works stations and our objective is to enhance the productivity of the operations by eliminating the time losses due to less effective man and machine utilization." So, suggest a plan or set of Management tools that will help in carrying out improvements in the the system.
Functional strategies have important roles in achieving business strategies. These strategies affect each other in many situations and in different ways. In absence of good correlation between them we can't do the best. Thus, we must find appropriate methods for achieving a good correlation.
Faced with a global marketplace characterized by a growing competitiveness, and higher expectations from customers, organizations are more and more under increasing pressure to demonstrate their status as corporate suppliers with good quality management systems, good environmental initiatives, good safety policies, among other practices. To meet such expectations, organizations are increasingly adopting integrated management systems based on internationally recognized standards. Research suggests that integrating management systems may provide significant advantages to organizations. Do you think that the healthcare sector may also benefit from such strategies? Why should healthcare institutions think about such options? Do you know any research paper(s) focused on such questions?