Waiting Line Model Research Articles

PERFORMANCE OPTIMISATION ON WAITING TIME USING QUEUEING THEORY IN AN ADVANCED MANUFACTURING ENVIRONMENT

Queueing is a common phenomenon in various stages of manufacturing systems and some other organisations. Queueing usually reduces the time required by managers and manufacturers to complete a desired task. The queueing mathematical theory is a viable tool for analysing a waiting line model. This research presents the implementation of robots at the packaging stage of a virtual manufacturing scenario in which mathematical models were used to describe each stage of the manufacturing process. Some suitable parameters and operating conditions were assumed, and the Newton-Raphson iteration formula was implemented for numerical analysis of the models. Simulation was carried out to achieve optimal values that could yield efficient productivity. The optimisation process gave an outcome that adequately showed how queueing can be managed in the packaging stage in an advanced manufacturing environment.

ROLE OF TIME STUDY IN EMERGENCY DEPARTMENT OF AN INDIAN HOSPITAL FOR QUALITY HEALTH CARE

ABSTRACTObjectives: To study the role of time study in the emergency department (ED) of an Indian hospital for quality health care. For that, an observationalcross-sectional time study was conducted at the casualty department of largest hospitals situated at central India.Methods: Systemic random sampling method is used to select the patients attending the ED. Following parameters and procedure were observedduring time study in the casualty department. Patient shifting on bed in ED, patient attending by nursing staff, patient attending and treatment bycasualty medical officer (CMO), waiting time for intensivist, diagnostic procedure, waiting time for bed and after the availability of bed, patient wasshifted to Intensive Coronary Care Unit (ICCU)/Intensive Care Unit (ICU)/ward.Results: Waiting times are observed which are of five types such as waiting for ward boy, CMO, intensivist, diagnostic procedure, and for bed in ICCUor ICU or ward.Conclusion: Result of this time and motion study shows that after the entry of the patient in the ED, he or she is subjected to different kinds of waitslike for ward boy, intensivist, diagnostic tests, bed in ICCU or ICU or ward. Out of this, wait for intensivist and for bed are very important for the overalltreatment of the patient. The hospital should aim at reducing these waits by proper management. This study focuses scope for the improvements inpatient waiting time which is the important contributor of the patient satisfaction.Keywords: Time study, Motion study, Waiting line model.

Role of Waiting Line Model in Reducing the Patient’s Waiting Time In The Emergency Department

Role of Waiting Line Model in Reducing the Patient’s Waiting Time In The Emergency Department

Real-Time Optimal Scheduling of a Group of Elevators in a Multi-Story Robotic Fully-Automated Parking Structure

Abstract This study presents a simulation-based feasibility study for development of a real-time scheduling algorithm for a multi-story and fully-automated parking structure with a group of elevators. Each elevator is conceived to carry one vehicle (car, small truck, SUV or minivan) between floors. Elevator count for a specific parking structure with number of floors in the range of 4 to 20, and 400 parking spaces on each floor is derived under an assumed customer arrival rate and mean service rate using the waiting line model of the queuing theory. A scheduling algorithm based on nested partitions and genetic algorithm is evaluated through the simulation study. The simulation environment models the mean arrival time of customers and elevator dynamics during morning rush hours for busy urban commercial multi-storied parking structures. Performance evaluation of the implemented elevator scheduling system was realized using the MATLAB environment. Performance metrics of mean customer waiting and elevator service times, and maximum customer waiting time were monitored. Simulation results demonstrate that the proposed design facilitates acceptable customer waiting and service times with good utilization rates for the elevators.

USE OF WAITING LINE MODEL IN CONSTRUCTION

This paper represents the improvement in operational productivity of Excavation by using Griffi’s Waiting Line Model which is one of the mathematical tool to improve the planning process in construction industry. The objective of this paper is to do sizing and matching based on zero idle time for both prime mover as well as associated unit to obtain optimum solution for particular operation. This research demonstrates the selective and timely use of established best practices, schedule reduction techniques, and management techniques decreases project completion time, improves project performance, and does not increase project cost.

Characteristics Of Waiting Line Models – The Indicators Of The Customer Flow Management Systems Efficiency

This paper is dedicated to the presentation of the single -channel waiting line systems with Poisson arrivals and exponential service times .They represent stages of customer flow management processes. Waiting systems are stochasti c mathematical models and they represent the describing base of the waiting phenomena, service p rocesses, prioritization, etc. Mathematical models of queuing theory present interest in modeli ng, designing and analysing of nowadays information networks. Increasing trend of their dev elopment and emergence of new network technologies, impose new requirements regarding the development of new mathematicals waiting models. In this paper we merely present the single- channel waiting line model, with example on a fast-food restaurant.

Waiting line model applications in manufacturing

Improving manufacturing and attaining manufacturing excellence to gain competitive advantage has attracted a lot of attention in the last few years. Many manufacturing operations and many of the technological advances in manufacturing systems like FMS, AGVs, GT, CIM, cellular manufacturing, AS/RS and JIT production systems admit modelling via waiting line or queueing theory. In this paper, the literature available on the application of waiting line models in manufacturing is reviewed. Future research directions on waiting line model applications for improving the performance of the manufacturing are pointed out.

A Waiting Line Model:

A model using wailing the principles was developed to assist with foodservice facilities design. The number of seals needed is calculated. Using values for area per seat previously published the size of the dining area can then be determined. The number of seats needed is dependent upon the meal patterns served, arrival rates of customers, turnover rates and the market demand. A residence hall food service was studied to develop the model and to compare calculated results with the existing dining area. The results indicate that wailing line principles can be used to calculate the number of seats needed when arrival rates are known.

Modelling and performance evaluation of multiprocessors, organizations with multi-memory units

In a multiprocessors configuration, a memory conflict occurs whenever two or more processors or I/O, s attempt to access the same memory unit simultaneously. The overall effect of these conflicts are lose of the system efficiency. A multiprocessor activity during execution of a program has been considered as a stochostic process which moves through a countable set of states. The process decides where to go next by a random mechanism which depends only on the current state and not on the previous history or even on the time. This kind of process is called Markov process. The transition from any state is possible only to the neighbouring states due to these conditions that the arrivale of request rate from processors and the memory communication rate follow a poisson distribution. Under these assumations a multi-server waiting line model has been developed for a multi-processors organisation. The basic motivation for this investigation will be the search to find a set of system parameters to measure the multiprocessors. performance with multi-memory nuits.The Makrovian waiting line model has been emplayed and obtained a general solution to estimate the effect of memory conflict on the average number of waiting units in the system, idle and busy periods for memory unit, system efficiency, the stretching factor of program on bases of "First Com, First Served" descipline.The simulation programs written by Basic to implement the developed waiting line model are general enough so that a system configuration of any size can be studied.

Modelling and performance evaluation of multiprocessors organization with shared memories

This paper is primarily concerned with theoretical evaluation of the performance of multi-processors system. A markovian waiting line model have been developed for various different multi-processors configurations, with shared memory.The system is analysed at the request level rather than job level.

Improving retail manpower planning with a quasi-subjective waiting line model

One of the most fruitful approaches for increasing marketing productivity is through more efficient manpower planning. This is particularly true in the labor intensive sectors of marketing such as retailing, particularly the retail department store. Waiting line models offer a high degree of potential for more effective manpower planning in the retail department store. The department store, however, presents a particular set of problems which make applications of waiting line models to manpower planning fairly complex. This complexity stems from two major sources: 1) consumer shopping behavior and 2) sales personnel management practices. This article discusses these problems and presents a model by which they can be handled for retail department stores. A detailed example illustrating the model's application is also provided.

Improving Retail Manpower Planning with a Quasi-Subjective Waiting Line Model

Improving Retail Manpower Planning with a Quasi-Subjective Waiting Line Model

Computer Simulation of a Waiting Line Model: An Example for Teachers to Use

Computer Simulation of a Waiting Line Model: An Example for Teachers to Use

STAFFING SERVICE ACTIVITIES WITH WAITING LINE MODELS

ABSTRACTThe problem of scheduling service activities and variable tasks has traditionally been solved subjectively. The lack of objective approaches has been due to the absence of formal standards and delay costs and by the high cost of examination and measurement. Some recent developments in work measurement concepts may permit the development of more objective standards, which when used in conjunction with scientific methodology such as waiting line theory, make possible objective scheduling of the variable service type activity.The work of a salesperson in a retail store provides an example of both the variable service type activity and the waiting line problem. The manager attempts to balance the cost of service facilities (sales personnel) against the cost of a waiting line (customer ill will). The necessary data inputs for the waiting line model were obtained from field studies by means of work sampling. Computer simulation was then utilized to study various sized sales forces in an attempt to determine the most economical staff allocation.