Bu makale, fonksiyonel olarak yerlestirilmis uretim sistemini hucrelerden olusan uretim sistemine... more Bu makale, fonksiyonel olarak yerlestirilmis uretim sistemini hucrelerden olusan uretim sistemine donusturmek isteyen tasarimcilar icin aksiyomlarla tasarim (AD) prensiplerine gore hazirlanmis butunsel bir yontemi sunmaktadir. Bagimsizlik aksiyomuna gore gelistirilen bu yontem, hucresel uretim sistemi donusum surecindeki tum adimlari sistematik bir bicimde saglar. Ayrica belirlenen performans olcutlerine gore hucresel uretim sisteminin degerlendirilmesini ve gelistirilmesini saglayan geri besleme sistemini de icermektedir. Yontem aluminyum esasli merdiven, rampa ve kopru urunleri ureten bir firmada uygulamaya alinmistir. Uygulama sonucunda elde edilen gelismeler yine calisma kapsaminda gosterilmektedir. Anahtar Kelimeler: Aksiyomlarla tasarim, hucresel uretim, uygulama rehberi.
Job shop scheduling has been the focus of a substantial amount of research over the last decade a... more Job shop scheduling has been the focus of a substantial amount of research over the last decade and most of these approaches are formulated and designed to address the static job shop scheduling problem. Dynamic events such as random job arrivals, machine breakdowns and changes in processing time, which are inevitable occurrences in production environment, are ignored in static job shop scheduling problem. As dynamic job shop scheduling problem is known NP-hard combinatorial optimization, this paper introduces efficient hybrid Genetic Algorithm (GA) methodologies for minimizing makespan in this kind of problem. Various benchmark problems including the number of jobs, the number of machines, and different dynamic events are generated and detailed numerical experiments are carried out to evaluate the performance of proposed methodologies. The numerical results indicate that the proposed methods produce superior solutions for well-known benchmark problems compared to those reported in the literature.
Conditions of competition in container terminals, which are the exit gates of the international n... more Conditions of competition in container terminals, which are the exit gates of the international networks of the container deployment tools, depend on the efficiency of these terminals. Effective use of the terminal equipments such as cranes in berths and in storage areas and the transporter vehicles between these two areas are the most important factors which affect the efficiency of the terminals. Yard Crane Scheduling (YCS) which are used in the operations generated in the storage areas has an important role in improving the efficiency of the terminals. In this paper, a new approach to free and restrictive deployment's rules, which is used in yard crane scheduling, is presented and also customer priority and assignment rules are investigated in combination. In this context, for the purpose of minimizing the total completion time of the operations, a mixed-integer linear mathematical model is proposed in order to solve the problems of assigning one or more yard cranes simultaneously and of routing. Results of this model, which is analyzed by using a genetic algorithm based approach, are presented with statistical analysis.
Müşteri ihtiyaçları doğrultusunda, sevk noktası ile talep noktası arasındaki malzemelerin akışı b... more Müşteri ihtiyaçları doğrultusunda, sevk noktası ile talep noktası arasındaki malzemelerin akışı boyunca yer alan tüm faaliyetlerin ekonomik olarak yürütülmesi, günümüzde lojistik firmalarının en önemli hedefidir. Firmalar lojistik faaliyetlerini yönetirken yoğun olarak iki tip problemle karşılaşmaktadır. Bunlardan birincisi depo içi operasyonlarına yönelik siparişlerin gruplandırılması, ikincisi ise gruplanan siparişlere ait toplama aracı rotasının belirlenmesidir. Lojistik sisteminin esnekliğini sağlamak ve verimliliğini arttırmak için bu iki faaliyetin en uygun şekilde planlaması gerekmektedir. Bu çalışmada, özellikle çapraz geçitli depo sistemleri için bu iki probleme eş zamanlı olarak çözüm sağlayan GANN (Genetic Algorithm-Nearest Neighbor) ve GAS (Genetic Algorithm-Savings) isimli iki yeni çözüm yöntemi önerilmiştir. Yöntemlerin etkinliğini belirlemek ve alternatifleri karşılaştırmak için farklı sipariş sayısı, hazırlık süresi, ağırlık ve toplama koordinatlarını içeren deney pr...
⎯ Container terminal authorities have been forced to find more efficient techniques to improve th... more ⎯ Container terminal authorities have been forced to find more efficient techniques to improve the performance in order to deal with huge amounts of containers processing by the dramatic growth in the freight volumes. Advanced technologies like automated guided vehicles (AGV) and automated lifting vehicles (ALV) have been recently used in container terminals to improve efficiency owing to their abilities on the repetitive nature of the terminal operations. Contrary to deep sea container terminals, short sea container terminals like in Turkey are built as artificially filled near the coasts because of their low berth deepness. The most common layouts in the short sea container terminals are Π, L, Ψ or π berth typed. In this paper, an object oriented simulation model is developed for berth type Π and used to demonstrate the impact of automation on the performance of the short sea container terminals. Indeed, we concentrate on the effects of AGV dispatching rules on the determined perf...
Global containership liners design their transportation service as hub-and-spoke networks to incr... more Global containership liners design their transportation service as hub-and-spoke networks to increase the market linkages and reduce the average operational costs by using indirect connections. These indirect connections from the hub ports to the feeder ports called feeder networks are serviced by feeder ships. The feeder network design (FND) problem determines the smallest feeder ship fleet size with routes to minimize operational costs. Therefore, this problem could be described as capacitated vehicle routing problem with simultaneous pick-ups and deliveries with time limit. In our investigation, a perturbation based variable neighborhood search (PVNS) approach is developed to solve the FND problem which determines the fleet mix and sequence of port calls. The proposed model implementation has been tested using a case study from the Black Sea region with the new Izmir port (Candarli port) as hub. Moreover, a range of scenarios and parameter values are used in order to test the rob...
Container terminal authorities have been forced to find more efficient techniques to improve the ... more Container terminal authorities have been forced to find more efficient techniques to improve the performance in order to deal with huge amounts of containers processing by the dramatic growth in the freight volumes. Advanced technologies like automated guided vehicles (AGV) and automated lifting vehicles (ALV) have been recently used in container terminals to improve efficiency owing to their abilities on the repetitive nature of the terminal operations. Contrary to deep sea container terminals, short sea container terminals like in Turkey are built as artificially filled near the coasts because of their low berth deepness. The most common layouts in the short sea container terminals are Π, L, Ψ or π berth typed. In this paper, an object oriented simulation model is developed for berth type Π and used to demonstrate the impact of automation on the performance of the short sea container terminals. Indeed, we concentrate on the effects of AGV dispatching rules on the determined performance criterion of total container handling in quay cranes. The results of the simulation show that AGV dispatching rules and terminal layouts have significant effects on the performance of the terminals and the number of the AGVs used.
Pamukkale University Journal of Engineering Sciences, 2005
Route choice in urban transportation networks is a complex decision making problem for the road u... more Route choice in urban transportation networks is a complex decision making problem for the road users. This decision has resulted in different ways such as increase in transportation cost and negative effects on driver psychology. Travel time, congestion, safety and environmental effects are the important criteria that should be taken in to account in route choice. Selection of the convenient route under determined criteria using the information axiom will be realized in this study. The Information axiom, the second axiom of Axiomatic Design (AD) principles, proposes the selection of the proper alternative that has minimum information content. Axiomatic approach including crisp information axiom for complete information and fuzzy information axiom for incomplete information is used as a tool for the evaluation of alternative routes in Denizli.
Bu makale, fonksiyonel olarak yerlestirilmis uretim sistemini hucrelerden olusan uretim sistemine... more Bu makale, fonksiyonel olarak yerlestirilmis uretim sistemini hucrelerden olusan uretim sistemine donusturmek isteyen tasarimcilar icin aksiyomlarla tasarim (AD) prensiplerine gore hazirlanmis butunsel bir yontemi sunmaktadir. Bagimsizlik aksiyomuna gore gelistirilen bu yontem, hucresel uretim sistemi donusum surecindeki tum adimlari sistematik bir bicimde saglar. Ayrica belirlenen performans olcutlerine gore hucresel uretim sisteminin degerlendirilmesini ve gelistirilmesini saglayan geri besleme sistemini de icermektedir. Yontem aluminyum esasli merdiven, rampa ve kopru urunleri ureten bir firmada uygulamaya alinmistir. Uygulama sonucunda elde edilen gelismeler yine calisma kapsaminda gosterilmektedir. Anahtar Kelimeler: Aksiyomlarla tasarim, hucresel uretim, uygulama rehberi.
Job shop scheduling has been the focus of a substantial amount of research over the last decade a... more Job shop scheduling has been the focus of a substantial amount of research over the last decade and most of these approaches are formulated and designed to address the static job shop scheduling problem. Dynamic events such as random job arrivals, machine breakdowns and changes in processing time, which are inevitable occurrences in production environment, are ignored in static job shop scheduling problem. As dynamic job shop scheduling problem is known NP-hard combinatorial optimization, this paper introduces efficient hybrid Genetic Algorithm (GA) methodologies for minimizing makespan in this kind of problem. Various benchmark problems including the number of jobs, the number of machines, and different dynamic events are generated and detailed numerical experiments are carried out to evaluate the performance of proposed methodologies. The numerical results indicate that the proposed methods produce superior solutions for well-known benchmark problems compared to those reported in the literature.
Conditions of competition in container terminals, which are the exit gates of the international n... more Conditions of competition in container terminals, which are the exit gates of the international networks of the container deployment tools, depend on the efficiency of these terminals. Effective use of the terminal equipments such as cranes in berths and in storage areas and the transporter vehicles between these two areas are the most important factors which affect the efficiency of the terminals. Yard Crane Scheduling (YCS) which are used in the operations generated in the storage areas has an important role in improving the efficiency of the terminals. In this paper, a new approach to free and restrictive deployment's rules, which is used in yard crane scheduling, is presented and also customer priority and assignment rules are investigated in combination. In this context, for the purpose of minimizing the total completion time of the operations, a mixed-integer linear mathematical model is proposed in order to solve the problems of assigning one or more yard cranes simultaneously and of routing. Results of this model, which is analyzed by using a genetic algorithm based approach, are presented with statistical analysis.
Müşteri ihtiyaçları doğrultusunda, sevk noktası ile talep noktası arasındaki malzemelerin akışı b... more Müşteri ihtiyaçları doğrultusunda, sevk noktası ile talep noktası arasındaki malzemelerin akışı boyunca yer alan tüm faaliyetlerin ekonomik olarak yürütülmesi, günümüzde lojistik firmalarının en önemli hedefidir. Firmalar lojistik faaliyetlerini yönetirken yoğun olarak iki tip problemle karşılaşmaktadır. Bunlardan birincisi depo içi operasyonlarına yönelik siparişlerin gruplandırılması, ikincisi ise gruplanan siparişlere ait toplama aracı rotasının belirlenmesidir. Lojistik sisteminin esnekliğini sağlamak ve verimliliğini arttırmak için bu iki faaliyetin en uygun şekilde planlaması gerekmektedir. Bu çalışmada, özellikle çapraz geçitli depo sistemleri için bu iki probleme eş zamanlı olarak çözüm sağlayan GANN (Genetic Algorithm-Nearest Neighbor) ve GAS (Genetic Algorithm-Savings) isimli iki yeni çözüm yöntemi önerilmiştir. Yöntemlerin etkinliğini belirlemek ve alternatifleri karşılaştırmak için farklı sipariş sayısı, hazırlık süresi, ağırlık ve toplama koordinatlarını içeren deney pr...
⎯ Container terminal authorities have been forced to find more efficient techniques to improve th... more ⎯ Container terminal authorities have been forced to find more efficient techniques to improve the performance in order to deal with huge amounts of containers processing by the dramatic growth in the freight volumes. Advanced technologies like automated guided vehicles (AGV) and automated lifting vehicles (ALV) have been recently used in container terminals to improve efficiency owing to their abilities on the repetitive nature of the terminal operations. Contrary to deep sea container terminals, short sea container terminals like in Turkey are built as artificially filled near the coasts because of their low berth deepness. The most common layouts in the short sea container terminals are Π, L, Ψ or π berth typed. In this paper, an object oriented simulation model is developed for berth type Π and used to demonstrate the impact of automation on the performance of the short sea container terminals. Indeed, we concentrate on the effects of AGV dispatching rules on the determined perf...
Global containership liners design their transportation service as hub-and-spoke networks to incr... more Global containership liners design their transportation service as hub-and-spoke networks to increase the market linkages and reduce the average operational costs by using indirect connections. These indirect connections from the hub ports to the feeder ports called feeder networks are serviced by feeder ships. The feeder network design (FND) problem determines the smallest feeder ship fleet size with routes to minimize operational costs. Therefore, this problem could be described as capacitated vehicle routing problem with simultaneous pick-ups and deliveries with time limit. In our investigation, a perturbation based variable neighborhood search (PVNS) approach is developed to solve the FND problem which determines the fleet mix and sequence of port calls. The proposed model implementation has been tested using a case study from the Black Sea region with the new Izmir port (Candarli port) as hub. Moreover, a range of scenarios and parameter values are used in order to test the rob...
Container terminal authorities have been forced to find more efficient techniques to improve the ... more Container terminal authorities have been forced to find more efficient techniques to improve the performance in order to deal with huge amounts of containers processing by the dramatic growth in the freight volumes. Advanced technologies like automated guided vehicles (AGV) and automated lifting vehicles (ALV) have been recently used in container terminals to improve efficiency owing to their abilities on the repetitive nature of the terminal operations. Contrary to deep sea container terminals, short sea container terminals like in Turkey are built as artificially filled near the coasts because of their low berth deepness. The most common layouts in the short sea container terminals are Π, L, Ψ or π berth typed. In this paper, an object oriented simulation model is developed for berth type Π and used to demonstrate the impact of automation on the performance of the short sea container terminals. Indeed, we concentrate on the effects of AGV dispatching rules on the determined performance criterion of total container handling in quay cranes. The results of the simulation show that AGV dispatching rules and terminal layouts have significant effects on the performance of the terminals and the number of the AGVs used.
Pamukkale University Journal of Engineering Sciences, 2005
Route choice in urban transportation networks is a complex decision making problem for the road u... more Route choice in urban transportation networks is a complex decision making problem for the road users. This decision has resulted in different ways such as increase in transportation cost and negative effects on driver psychology. Travel time, congestion, safety and environmental effects are the important criteria that should be taken in to account in route choice. Selection of the convenient route under determined criteria using the information axiom will be realized in this study. The Information axiom, the second axiom of Axiomatic Design (AD) principles, proposes the selection of the proper alternative that has minimum information content. Axiomatic approach including crisp information axiom for complete information and fuzzy information axiom for incomplete information is used as a tool for the evaluation of alternative routes in Denizli.
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