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The rise of the network economy and E-commerce has pushed the rapid development of logistics market. The Multi-tier Shuttle Warehousing System (MSWS) as a new autonomous unit load storage/retrieval system, which flexibility and work efficiency is much-improved compared with the conventional AS/RS, has attracted more and more attention of logistics enterprises both at home and abroad. MSWS is composed...
Datacenter networks are becoming crucial foundations for our information technology based society. However, commercial datacenter infrastructure is often unavailable to researchers for conducting experiments. In this work, we therefore elaborate on the possibility of combining commercial hardware and simulation to illustrate the scalability and performance of datacenter networks. We simulate a Datacenter...
In situ processing proposes to reduce storage needs and I/O traffic by processing results of parallel simulations as soon as they are available in the memory of the compute processes. We focus here on computing in situ statistics on the results of N simulations from a parametric study. The classical approach consists in running various instances of the same simulation with different values of input...
In this paper, we study the dynamics of coupled speed scaling systems, in which service rate is a function of system occupancy. We focus on both Processor Sharing (PS) and Shortest Remaining Processing Time (SRPT) as scheduling disciplines, and study their speed scaling dynamics under heavy load. Using a combination of Markov chain analysis and discrete-event simulation, we identify several important...
Due to the analytical intractability of general tandem queues, we develop methods to quantify the dependence among servers through simulation. Dependence is defined by the contribution queue time at each server, and contribution factors are developed based on the insight from Friedman's reduction method and Jackson networks. In a tandem queue, the dependence among stations can be either diffusion...
The literature on Small and Medium Enterprises often discusses the emergent nature of the product development processes, however; it often does not address the lack of planning tools within such organizations. We aim to fill the gap in tool support for the planning process, by developing a discrete event simulation model to compute lead times of product development projects. The developed model explicitly...
One of the traffic problems in the transportation system is the emergency vehicles management such as fire trucks, ambulances, and so forth. It is necessary to know the characteristics of the traffic flow on a single road when the road appears to the presence of emergency vehicles. This paper presents an analysis of the characteristics of the traffic flow on a single road when traffic passing through...
This paper is a study of staff issues at the bank, ICBC China. Due to extra and imbalanced staff, the system was idle most of the time. By using the qualitative approach, M/M/s queuing model and discrete event simulation, the staff was sub-optimized. First, observation of the system was conducted and recorded using the existing operations system used by the bank. Arrival time of customers, service...
This paper describes the application of simulation in designing and improving a client service system at an insurance company. The importance of this study is to propose a better practice to improve the company's counter services. Moreover, the outcomes of this study are believed will assist to reduce the waiting times. A simulation approach has been applied in order to fulfill the objectives of this...
Performance prediction has been intensively studied in the last decade, alongside the accelerated development of distributed systems. This paper focuses on a hybrid approach regarding model solving, combining two popular prediction techniques applied separately so far, analytical and simulation modeling, in order to benefit from the strengths of both. The input UML model with MARTE (Modeling and Analysis...
This paper proposes an extended queuing system that will be called the VCHS queuing system. Several strategies for server assignment were evaluated using simulations, and selection of the appropriate strategy was found to lead to a marked improvement in system performance.
Large and complex models can often benefit from parallel execution on multiple machines. In the Mobius modeling environment, this is especially true of models for which the user wants to examine several independent configurations or parameterizations. A remote job server with the capability to securely forward jobs to remote workstations or securely submit jobs via a standard batch submission system,...
Fault-tolerant systems with repair-upon-failure strategy can become expensive in terms of labour and time. Postponing non essential repairs can reduce these costs. Of course, while postponing these repairs, it is essential to keep the whole system capable to deal with user requests. For this purpose, usually, a threshold value is defined which represents the minimum number of servers the system administrator...
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