Kaynak Dengeleme Probleminin Arama Uzayını Paralel Programlama ile Tarayarak Kesin Çözümü

Yıl 2021, Cilt: 32 Sayı: 3, 10767 - 10805, 01.05.2021

Önder Halis Bettemir , Tuğba Erzurum

https://doi.org/10.18400/tekderg.595238

Cited By: 3

Öz

Kaynak dengeleme problemi (KDP) sezgisel, modern sezgisel ve matematiksel yöntemlerle çözülmektedir. Fakat belirtilen yöntemler özellikle büyük boyutlu problemler için kesin çözümü garanti edememektedir. Bu çalışmada KDP'nin aktiviteler arasındaki bağımlılık ilişkilerini ihlal etmeden ve proje süresinde uzamaya neden olmayacak şekilde bolluğu olan aktivitelerin ertelenmesi ile elde edilebilecek birbirinden farklı kaç iş programı oluşturulabileceği hesaplanmıştır. Arama uzayı olarak tanımlanan tüm uygulanabilir iş programlarının tamamının denenmesi ile garantili biçimde KDP'nin en iyi çözümü elde edilerek mevcut yöntemlerden farklı biçimde KDP'nin çözülmesi sağlanmıştır. Aktivite sayısı ile arama uzayı arasında seri bağlı aktiviteler için üstel bağıntı formülü türetilerek büyük projelerin tek işlemci ile çözümünün makul sürede gerçekleşemeyeceği belirlenmiştir. Problemin paralel programlama ile tüm işlemcilere eşit sayıda şebeke çözümü düşecek şekilde paylaştırılması sağlanmıştır. Bu çalışmada en büyüğü 36 aktiviteli olan 4 KDP arama uzayının tamamı taranıp makul sürede çözülerek geliştirilen yöntemin uygulanabilir olduğu kanıtlanmıştır. Bu yöntem ile daha küçük parçalara ayırmak sureti ile daha büyük kaynak dengeleme problemlerinin kesin çözümü elde edilebilecektir.

Anahtar Kelimeler

Kaynak Dengeleme Problemi, Optimizasyon, Kritik Yol Yöntemi

Exact Solution of Resource Leveling Problem by Exhaustive Enumeration with Parallel Programming

Öz

Resource Leveling Problem (RLP) is solved by heuristic, meta-heuristic, and mathematical methods. However, the aforementioned methods cannot guarantee the exact solution for large size problems. In this study, number of feasible schedules which can be obtained by delaying the non-critical activities without violating the precedence relationships and elongating the project completion time are computed. All of the feasible schedules which can be defined as the search domain are enumerated and the guaranteed optimum solution for the RLP is obtained by a different method from the existing methods. Exponential equation between the search domain and the number of activities on serial path is derived and the insolvability of large RLP in a reasonable time by one central processing unit is verified. Partitioning of the problem into equal sizes is provided by parallel programming so that each particle contains the same number of enumeration. In this study, four RLP in which the largest problem has 36 activities are solved by exhaustive enumeration within reasonable solution time and it is proved that the proposed method is applicable. Exact solutions of larger problems can also be obtained by the proposed method if the problem is partitioned into smaller sizes.

Anahtar Kelimeler

Resource Leveling Problem, Optimization, Critical Path Method

Kaynakça

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