نتایج جستجو برای: fleet of ships scheduling

تعداد نتایج: 21175771  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم ریاضی و مهندسی کامپیوتر 1392

heuristics are often used to provide solutions for flow shop scheduling problems.the performance of a heuristic is usually judged by comparing solutions and run times on test cases.this investigation proposes an analytical alternative ,called asymptotic convergence ,which tests the convergence of the heuristic to a lower bound as problem size grows. the test is a stronger variation of worst cas...

2010
Steven W. Mitchell

Managing the evolution of a complex product family that is deployed and maintained in multiple variants on various platforms using traditional systems engineering tools and processes is a significant challenge. An example is managing the evolution of a common combat system across a fleet of submarines. Due to the realities of budgets and operational scheduling, multiple versions of the product ...

2011
T. Lloyd G. E. Hearn A. Burden B. Smith

Investigation of feeder ships worldwide has identified South East Asian and the Caribbean as transshipment markets open to feeder ship replacement with a need for improved operational efficiency. In response to this challenge an environmentally sustainable feeder-container ship concept has been developed for the 2020 container market. The concept utilises higher speed and larger capacity than t...

Journal: :AI Magazine 1995
Robert A. Small Bryan Yoshimoto

The vertical launch system (VLS) is the U.S. Navy’s premier missile launch system for surface ships. The VLS is modular, and its configuration is tailored to the individual ship. Depending on ship type or class, ship configurations have one or two launching systems. A ship can carry between 61 and 121 missiles. At the end of fiscal year 1993, about 73 systems were deployed on 46 ships; these nu...

Journal: :International maritime health 2005
Mohammad Ali Hasanzadeh Ebrahim Azizabadi Nosrat Allah Alipour

The maritime health services system is presented in this review article. The national Iranian shipping line IRISL owns the largest commercial fleet in the Middle East and it operates 137 ships. This company and several other national shipping companies employ over 5900 seafarers. There are 11,000 fishing ships and boats and the number of Iranian fishermen reaches 124,000. Seafarers and fisherme...

2014
C. A. Silva C. Guedes Soares

The growth in the short sea shipping sector motivated the development of a methodology used as a decision support tool in which both the parameters regarding the demand of markets and the characteristics of the fleet may be tested and appraised. It is also possible to determine the fleet deployment, establishing its routes and scales in the ports for a particular scenario. The considered method...

2011
Elena Kelareva

We present an automated ship scheduling system – DUKC R © Optimiser – which selects sailing times for a set of cargo ships at a port, so as to maximise total cargo throughput while meeting port operational and safety guidelines, as well as producing schedules that are fair to all companies using the port. The system has been developed by maritime engineering company OMC International, incorpora...

Journal: :Computers & Industrial Engineering 2010
Chia-Hung Chen Shangyao Yan Miawjane Chen

The solution algorithm, based on Lagrangian relaxation, a sub-gradient method and a heuristic to find the upper bound of the solution, is proposed to solve the coordinated fleet routing and flight scheduling problems. Numerical tests are performed to evaluate the proposed algorithm using real operating data from two Taiwan airlines. The test results indicate that the solution algorithm is a sig...

1999
Vadim V. Bulitko David C. Wilkins

The blackboard approach has been successfully used in a variety of domains. A typical problem-solving cycle consists of deliberation, scheduling, and execution steps. This paper presents a scheduling approach that uses the mathematically well-founded framework of Petri Nets as an environment model to represent the scheduling context. The paper extends the classical Petri Nets model in various w...

2005
Maged Dessouky Merrill Weidner

ii ABSTRACT In certain types of fleet systems, the environmental impacts of fleet operation are, to some extent, a controllable function of vehicle routing and scheduling decisions. However, there has been little prior work that has considered environmental impacts in fleet vehicle routing and scheduling optimization, in particular, where the impacts were assessed systematically utilizing life-...

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