Ayrıntılı Bilimsel Program ve Bildiri Özetleri - YAEM2010

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YAEM 2010 YÖNEYLEM ARAÞTIRMASI VE ENDÜSTRÝ MÜHENDÝSLÝGI 30. ULUSAL KONGRESÝ sonunda fabrikadan karþýlar. Yerel ve merkezi depolarda, verilen “base stock” seviyelerinin performansýný bulmaya yönelik hýzlý çalýþan bir sezgisel yöntem önerilip benzerleri ile karþýlaþtýrýlmýþ ve ortalamada önerilen metodun gerçeðe daha yakýn sonuçlar verdiði görülmüþtür. Stoða-Üretim Sistemlerinin Sürekli Zamanda Kontrolü Önder Bulut, Mehmet Murat Fadýloðlu Bilkent Üniversitesi, Endüstri Mühendisliði Bölümü, Ankara Envanter kontrolü üzerine yapýlan çalýþmalar iki ana kolda toplanabilinir: kapasite kýsýtý olmayan tedarik kanalýný ele alan tipik envanter modelleri ve kýsýtlý üretim kapasitesine sahip stoða-üretim sistemlerini ele alan modeller. Bu çalýþmada, üretim kanalý sayýsý herhangi bir deðeri alabilecek þekilde serbest býrakýlarak, kapasite kýsýtý olan ve olmayan sistemler tek bir modelle incelenmektedir. Çalýþmada özel olarak, paralel üretim kanallarý ve birden çok müþteri sýnýfýna sahip, yok satmalý stoða-üretim sistemleri için üretim ve stok tayýnlama kontrol problemleri ele alýnmaktadýr. Baðýmsýz Poisson talep süreçleri ile Üssel daðýlýmlý üretim zamanlarý varsayýlmýþtýr. Karar anlarýnda kontröller, stok paylaþtýrma kararý ile birlikte aktif olan üretim kanal sayýsýný arttýrýp arttýrýlmayacaðýný belirler. Daha önce verilen üretim sipariþleri iptal edilemez. Sistem, M/M/s stoða-üretim kuyruk modeli olarak incelenmiþ, en iyi üretim politikasýnýn duruma- baðlý temel-düzey politikasý ve en iyi tayýnlama politikasýnýn duruma- baðlý eþik tipi politika olduðu gösterilmiþtir. Sipariþ iptaline izin verildiðinde, en iyi üretim politikasýnýn ya hep-ya hiç tarzý bir politikaya dönüþtüðü ispatlanmýþtýr. En iyi politikanýn teknik yazýnda ele alýnan temel-düzey politikasý ile kýyaslandýðýnda saðladýðý kazanç nicelenmiþtir. Sistemin, temel-düzey ve ya hep-ya hiç politikalarý altýnda duraðan analizi de yapýlmýþtýr. 256
YAEM 2010 YÖNEYLEM ARAÞTIRMASI VE ENDÜSTRÝ MÜHENDÝSLÝGI 30. ULUSAL KONGRESÝ We assume that the seller is not willing to invest in the quality assessment of its inventory and simply charges the same price for the inventory. With this in mind, we explore an environment where customers choose the best available items first from an identically priced inventory. In this environment, by observing sales whic h are shaped by customers' quality assessment, the seller is able to infer quality information on its remaining inventory. Formulating and analyzing a two-stage inventory pricing problem, we assess the benefits of dynamic pricing in this setting. A Robust Optimization Approach to Network Airline Revenue Management 1 1 2 Þ. Ýlker Birbil , Hans Frenk , Joaquim A.s. Gromicho , Shuzhong 3 Zhang 1 Faculty of Engineering and Natural Sciences, Sabancý University, Istanbul 2 Vrije Universiteit, Amsterdam, The Netherlands 3 Department of Systems Engineering and Engineering Management, The Chinese University of Hong Kong, Shatin, Hong Kong In this paper, we are interested in the mathematical programming models that yield the optimal allocation of the seat capacities available at the single flight legs among the different route-fare class customers under deterministic and stochastic demand. Our mathematical models, both robust and nonrobust, are based on route-based reformulations of the considered problems. The route- based approach allows us to separate the decision of allocating the leg capacities to the routes from the decision of reserving seats to different fare classes within each route. That is, whenever the capacity of a certain route is fixed, then the optimal distribution of this capacity among the fare classes boils down to solving a single-leg problem. Moreover, again by using the route-based approach, we can also easily come up with the robust versions of the mathematical programming models. To obtain the optimal robust or nonrobust allocation of capacity among different fare classes on a single route, we use our previous results on single-leg problems. 257
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Ayrıntılı Bilimsel Program ve Bildiri Özetleri - YAEM2010

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