Hierarchical Chinese Postman Problem with Stochastic Parameter Values and an Application

Öz

The importance is given to the transportation sector, which greatly affects the economic and social development of countries, and therefore the importance given to the routing problems is increasing day by day. Today, cost-cutting policies should be followed in routing activities in both public institutions and private sectors. In this context, it is important to deliver a product or person to its destination in the shortest time and with the least cost. Routing problems are divided into two as edge routing and node routing. In this study, The hierarchical Chinese postman problem (HCPP), which is one of the route routing problems and aims to find the shortest tour or tours by passing at least once on arcs which classified according to priority relations, is discussed. Parameters appear as random variables due to uncertainty in many real-life problems. Travel time between nodes in a network; which varies depending on various reasons such as weather conditions, traffic density, etc so HCPP was solved by the chance-constrained stochastic programming approach in this study. In the study, deterministic model was created by using the chance constrained stochastic programming model emerging, when the objective function coefficients, which are random variables, have normal distribution. The developed mathematical model with stochastic parameter values was solved in GAMS 24.2.3 package program using CPLEX solver.

Anahtar Kelimeler

• Arc routing problem
• hierarchical Chinese postman problem
• chance- constrained stochastic programming

Stokastik Parametre Değerlerine Sahip Hiyerarşik Çinli Postacı Problemi ve Bir Uygulama

Öz

Ülkelerin ekonomik ve sosyal gelişimini büyük oranda etkileyen ulaşım sektörüne ve dolayısıyla rotalama problemlerine verilen önem gün geçtikçe artmaktadır. Günümüzde gerek kamu kuruluşları, gerekse özel sektörlerde rotalama faaliyetlerinde maliyet azaltıcı politikaların izlenmesi gerekmektedir. Bu bağlamda bir ürün veya kişinin gideceği yere en kısa sürede ve en az maliyetle ulaştırılması önem arz etmektedir. Rotalama problemleri ayrıt rotalama ve düğüm rotalama olmak üzere ikiye ayrılmaktadır. Bu çalışmada ayrıt rotalama problemlerinden biri olup öncelik ilişkilerine göre sınıflandırılmış ayrıtlardan en az bir kez geçilerek en kısa tur veya turların bulunmasını hedefleyen hiyerarşik Çinli postacı problemi (HÇPP) ele alınmıştır. Gerçek hayat problemlerinin birçoğunda belirsizlik nedeniyle parametreler rasgele değişken olarak karşımıza çıkmaktadır. Bir şebekede düğümler arasındaki ulaşım süresi; hava şartları, trafik yoğunluğu gibi çeşitli sebeplerden ötürü değişkenlik gösterdiği için bu çalışmada HÇPP, şans kısıtlı stokastik programlama yaklaşımı ile çözülmüştür. Çalışmada rasgele değişken olan amaç fonksiyonu katsayılarının normal dağılıma sahip olması durumunda ortaya çıkan şans kısıtlı stokastik programlama modeli kullanılarak deterministik model oluşturulmuştur. Geliştirilen stokastik parametre değerlerine sahip matematiksel model GAMS 24.2.3 paket programında CPLEX çözücü kullanılarak çözülmüştür.

Anahtar Kelimeler

• Ayrıt rotalama problemi
• hiyerarşik Çinli postacı problemi
• şans kısıtlı stokastik programlama

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