Articulos(INMABB)
http://hdl.handle.net/11336/68
Articulos de INST.DE MATEMATICA BAHIA BLANCA (I)Sun, 08 Dec 2019 02:50:49 GMT2019-12-08T02:50:49ZThe argentinian forest sector: Opportunities and challenges in supply chain management
http://hdl.handle.net/11336/89552
The argentinian forest sector: Opportunities and challenges in supply chain management
Broz, Diego Ricardo; Rossit, Daniel Alejandro; Rossit, Diego Gabriel; Cavallin, Antonella
The rise in the worldwide demand of forest products of the last decades predicts an expansion of the forest harvesting industry. In this context, the Argentinian Northeastern Region (NEA) is considered a promising land since the local forest harvesting industry has one of the largest growing rates in the world. Despite its potential, this region faces some challenging obstacles: budget shortage, trade barriers and poor logistic infrastructure. For instance, traditionally the forest products are delivered by truck, which is from three to five times more expensive than other means of transport, like maritime or river transport. This is why in this paper, after a revision of the most recent advances in the worldwide supply chain management practices in the forest industry, recommendations for Argentina in order to overcome its main drawbacks in the forest sector are presented.
Thu, 18 Jan 2018 00:00:00 GMThttp://hdl.handle.net/11336/895522018-01-18T00:00:00ZForest management decision making based on a real options approach: An application to a case in northeastern Argentina
http://hdl.handle.net/11336/89526
Forest management decision making based on a real options approach: An application to a case in northeastern Argentina
Broz, Diego Ricardo; Milanesi, Gastón; Rossit, Daniel Alejandro; Rossit, Diego Gabriel; Tohmé, Fernando Abel
The Net Present Value (NPV) approach is widely applied to assess forest investments, but this method has serious shortcomings, which we propose to overcome by switching to the assessment through the Real Options Approach (ROA). The model in this paper starts with the simulation of the forest´s growth, combined with the projection of the products´ prices and valuing the assets using a binomial model. We include an option of postponement, determining the optimal period of felling. We find that ROA is more robust than the NPV approach because it relaxes the assumption of constancy of both the prices and the discount rate, allowing the determination of the optimal time of felling based on the growth rate of either the forest or the prices of its products. Contrary to the traditional NPV approach, the results obtained with ROA exhibit longer harvest turns and consequently higher profits. The key variable in the ROA, the Real Option Value (ROV) can be shown to be less (albeit moderately) sensitive to decreases of the discount rate than NPV. Moreover, ROV is moderately sensitive to decreases in the price of logs and is negligibly affected by rises in the costs of harvesting, loading and transporting rolls.
Wed, 25 Apr 2018 00:00:00 GMThttp://hdl.handle.net/11336/895262018-04-25T00:00:00ZSymmetric implication zroupoids and identities of Bol–Moufang type
http://hdl.handle.net/11336/86022
Symmetric implication zroupoids and identities of Bol–Moufang type
Cornejo, Juan Manuel; Sankappanavar, Hanamantagouda P.
An algebra A= ⟨ A, → , 0 ⟩ , where → is binary and 0 is a constant, is called an implication zroupoid (I-zroupoid, for short) if A satisfies the identities: (I): (x→y)→z≈((z′→x)→(y→z)′)′, and (I0): 0 ′ ′≈ 0 , where x′: = x→ 0. An implication zroupoid is symmetric if it satisfies the identities: x′ ′≈ x and (x→y′)′≈(y→x′)′. An identity is of Bol–Moufang type if it contains only one binary operation symbol, one of its three variables occurs twice on each side, each of the other two variables occurs once on each side, and the variables occur in the same (alphabetical) order on both sides of the identity. In this paper, we will present a systematic analysis of all 60 identities of Bol–Moufang type in the variety S of symmetric I-zroupoids. We show that 47 of the subvarieties of S, defined by the identities of Bol–Moufang type, are equal to the variety SL of ∨ -semilattices with the least element 0 and one of others is equal to S. Of the remaining 12, there are only three distinct ones. We also give an explicit description of the poset of the (distinct) subvarieties of S of Bol–Moufang type.
Sun, 01 Jul 2018 00:00:00 GMThttp://hdl.handle.net/11336/860222018-07-01T00:00:00ZThe Dominance Flow Shop Scheduling Problem
http://hdl.handle.net/11336/86019
The Dominance Flow Shop Scheduling Problem
Rossit, Daniel Alejandro; Vásquez, Óscar C.; Tohmé, Fernando Abel; Frutos, Mariano; Safe, Martin Dario
We introduce a new line of analysis of Flow Shop scheduling problems, for the case of two jobs and assuming that processing times are unknown. The goal is to determine the domination relations between permutation and non-permutation schedules. We analyze the structural and dominance properties that ensue in this setting, based on the critical paths of schedules.
Wed, 01 Aug 2018 00:00:00 GMThttp://hdl.handle.net/11336/860192018-08-01T00:00:00Z