A fuzzy multi-criteria decision making approach for solving a bi-objective personnel assignment problem
Effective personnel assignment is one of the most crucial tasks performed by the decision makers of a company. This paper proposes a systematic approach with a feedback mechanism in which the interdependences among positions and the differences among ...
The multivariate moving window spectral method
The Univariate Moving Window Spectral method is extended to the Multivariate Moving Window Spectral method (MWS). This further mitigates the bias encountered in time series model parameter estimates, that otherwise results in multiple-period lead time ...
A study on customer involvement in final assembly for DIY products
The objective of this paper is to investigate the degree of the customer involvement in final assembly (CIFA) in establishing a do-it-yourself (DIY) product design in order to achieve cost minimization of the incumbent firm in a competitive environment. ...
A note on workload control for an under-utilized server of M/G/1 system
In this note, we study the issue of adjusting the workload of an under-utilized server in a queueing system. Using an M/G/1 model with server vacations of two types, we can effectively control the workload level of the server. The server vacations are ...
A class of multi-server queueing system with server failures
A multi-server queueing system with identical unreliable servers with phase type distributed service times is considered. The servers are subject to random breakdowns and repairs when a repair person is available. We consider both the cases of infinite ...
A genetic algorithm to solve the storage space allocation problem in a container terminal
In this paper, an efficient genetic algorithm (GA) is presented to solve an extended storage space allocation problem (SSAP) in a container terminal. The SSAP is defined as the temporary allocation of the inbound/outbound containers to the storage ...
On systematic methods to remove redundant monitors from liveness-enforcing net supervisors
Petri nets based deadlock prevention for flexible manufacturing systems has received much attention over the past decade, primarily due to the seminal work of Ezpeleta et al. in 1995. A Petri net based deadlock prevention mechanism is usually ...
The effect of investor psychology on the complexity of stock market: An analysis based on cellular automaton model
In this paper, using a developed cellular automaton model of the stock market, variables reflecting fractal and stability properties are introduced to describe complexity in the stock market; the concept of discrete level is defined to characterize ...
A comparison of algorithms for origin-destination matrix generation on real road networks and an approximation approach
This paper considers the generation of the origin-destination (OD) matrix, basic data in any vehicle routing or traveling salesman problem. An OD matrix must be generated by calculating the shortest paths between some nodes. Candidate methods for this ...
Multiresponse optimization of dispatch rules for public bus services
A multiple response optimization approach based on an integrated simulation model and a service reliability measure is proposed for optimizing the dispatch rules of public bus services. The simulation model is based on two novel Markov models for ...
A production-inventory model with remanufacturing for defective and usable items in fuzzy-environment
This paper investigates a production-remanufacturing system for a single product over a known-finite time horizon. Here the production system produces some defective units which are continuously transferred to the remanufacturing unit and the constant ...
Models for cell loading and product sequencing in labor-intensive cells
This paper focuses on cell loading issues and product sequencing in labor-intensive cells. In labor-intensive cells, there are usually more operators than number of operations and cells usually consists of simple and light-weight machines and equipment. ...
Incorporating uncertainty in optimal decision making: Integrating mixed integer programming and simulation to solve combinatorial problems
We introduce a novel methodology that integrates optimization and simulation techniques to obtain estimated global optimal solutions to combinatorial problems with uncertainty such as those of facility location, facility layout, and scheduling. We ...
Scheduling algorithms to minimize the number of tardy jobs in two-stage hybrid flow shops
This paper considers a two-stage hybrid flow shop scheduling problem for the objective of minimizing the number of tardy jobs. Each job is processed through the two production stages in series, each of which has multiple identical parallel machines. The ...
Performance modeling, real-time dispatching and simulation of wafer fabrication systems using timed extended object-oriented Petri nets
Semiconductor wafer fabrication system (SWFS) is the most complex and capital-intensive phase in the entire semiconductor manufacturing cycle. With characteristics of re-entrant processing routes, equipment uncertainty, product diversity and improving ...
Formulating the multi-segment goal programming
Goal programming (GP) is an important analytical approach devised to solve many real-word problems. However, the condition of multi-segment aspiration levels (MSAL) may exist in many marketing or decision management problems. The problem cannot be ...
A genetic algorithm and a simulated annealing algorithm combined with column generation technique for solving the problem of scheduling in the hybrid flowshop with additional resources
In this paper, a heuristic is proposed for solving the problem of scheduling in a two-stage flowshop with parallel unrelated machines and additional renewable resources at the first stage and a single machine at the second stage. Resource requirements ...
Safety interval analysis: A risk-based approach to specify low-risk quantities of uncertainties for contractor's bid proposals
By appearing more complex projects, Design-Bid-Build (DBB) contracts could not satisfy new projects requirements and a need to new types of contracts was felt. New contracts requirements differ from previous ones. Challenging the method of proposal ...
A newsboy problem with a simple reservation arrangement
Newsboy problems have always been an important issue in inventory management. A number of methods have been proposed to solve such problems based on different objectives or considerations. Different from the existing studies, this paper presents a ...
On the convergence of a new time window discretization method for the traveling salesman problem with time window constraints
In this paper, we discuss convergence of a time window discretization method for the traveling salesman problem with time window constraints. This recently proposed discretization method leads to a lower bound to the minimization problem. Analysis shows ...
A method of solving a large-scale rolling batch scheduling problem in steel production using a variant of column generation
This paper presents a transparent model and a solution approach to solve a large-scale rolling batch scheduling problem. First, the problem is formulated as a multiple routes problem with multi-objective (MRMOP). By defining a hierarchical cost ...
Multi-criteria sequence-dependent job shop scheduling using genetic algorithms
Real world job shops have to contend with jobs due on different days, material ready times that vary, reentrant workflows and sequence-dependent setup times. The problem is even more complex because businesses often judge solution goodness according to ...
Minimizing the normalized sum of square for workload deviations on m parallel processors
In many organizations, it is desirable to distribute workload as equally as possible among a group of employees or machines. This paper proposes a performance measure, that we call the Normalized Sum of Square for Workload Deviations (NSSWD), and ...
A two-warehouse inventory model with imperfect quality production processes
One of the weaknesses of some production-inventory models is the unrealistic assumption that all items produced are of good quality. But production of defective units is a natural phenomenon in a production process. Defective items should be treated as ...
Automated process planning method to machine A B-Spline free-form feature on a mill-turn center
In this paper, we present a methodology for automating the process planning and NC code generation for a widely encountered class of free-form features that can be machined on a 3-axis mill-turn center. The free-form feature family that is considered is ...
Retailer's optimal ordering and discounting policies under advance sales discount and trade credits
Providing advance sales discount program to attract consumers or eliminate demand uncertainty is commonly in today's business, such as music disk, apparel, books, etc. Also, trade credit is a popular payment behavior in B2B and B2C transactions. In this ...
A discrete particle swarm optimization algorithm for scheduling parallel machines
As a novel evolutionary technique, particle swarm optimization (PSO) has received increasing attention and wide applications in a variety of fields. To our knowledge this paper investigates the first application of PSO algorithm to tackle the parallel ...
A practical methodology for realizing product service systems for consumer products
Current Product Service Systems (PSS) research mainly focuses on car sharing schemes and chemical management services, which has not really addressed consumer products. Existing methods and tools related to PSS are mainly concerned with general PSS and ...
Overall availability of a robot with internal safety device
We introduce a robot-safety device system composed of a robot with internal (built-in) safety device. The system is characterized by a safety shut-down rule and by the natural feature of standby. In order to obtain the point availability of the twin-...
