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Fine paper mills produce a variety of paper grades to satisfy demand for a large number of sheeted products. Huge reels of different paper grades are produced on a cyclical basis on paper machines. These reels are then cut into rolls of smaller size which are then either sold as such, or sheeted into finished products in converting plants. A huge number of roll sizes would be required to cut all finished products without trim loss and they cannot all be inventoried. An assortment of rolls is inventoried with the implication that the sheeting operations may yield trim loss. The selection of the assortment of roll sizes to stock and the assignment of these roll sizes to finished products have a significant impact on performances. This paper presents a model to decide the parent roll assortment and assignments to finished products based on these products demand processes, desired service levels, trim loss and inventory holding costs. Risk pooling economies made by assigning several finished products to a given roll size is a fundamental aspect of the problem. The overall model is a binary non-linear program. Two solution methods are developed: a branch and price algorithm based on column generation and a fast pricing heuristic, and a marginal cost heuristic. The two methods are tested on real data and also on randomly generated problem instances. The approach proposed was implemented by a large pulp and paper company. 相似文献
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Thabet Rafika Bork Dominik Boufaied Amine Lamine Elyes Korbaa Ouajdi Pingaud Hervé 《Requirements Engineering》2021,26(3):371-397
Requirements Engineering - Risk-aware Business Process Management (R-BPM) has been addressed in research since more than a decade. However, the integration of the two independent research streams... 相似文献
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Vincent Placet Ousseynou Cisse M. Lamine Boubakar 《Journal of Materials Science》2012,47(7):3435-3446
The aim of this study is to throw new light on the influence of moisture on the mechanical properties of hemp fibres. Indeed,
the behaviour of plant-based fibres strongly depends on their humidity. Although this topic has been relatively well treated
for the case of wood, the literature on fibre stemming from annual plants is unfortunately poor. This purpose is, however,
of great importance, particularly in view of the production of high-performance composites. The influence of environmental
conditions on the static and dynamic tensile moduli and the strength of elementary fibres are investigated using a versatile
experimental setup. Novel equipment was also designed to measure the rotation of a fibre about its axis when it was subjected
to static loading and moisture variations. Water sorption is shown to have a significant influence on the apparent tensile
stiffness, strength and fracture mode of such fibres, and is also shown to act like an activator of the stiffening phenomena
under cyclic loading. A remarkable increase in the fibre stiffness of up to 250% is measured. Significant longitudinal elongation,
reaching a value in excess of 2%, is associated with this increase in stiffness. The absorption and desorption of moisture
also lead to substantial rotation of the fibre about its axis. Water sorption certainly involves a modification of the adhesion
between cellulose microfibrils and the amorphous matrix. Under cyclic loading, the cellulose microfibrils could be able to
creep into the relaxed amorphous matrix, leading to their re-arrangement, with more parallel orientations with respect to
the fibre axis. 相似文献
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Lamine M. Aouad Nhien-An Le-Khac Tahar M. Kechadi 《Knowledge and Information Systems》2010,23(1):55-72
In this article, we focus on distributed Apriori-based frequent itemsets mining. We present a new distributed approach which
takes into account inherent characteristics of this algorithm. We study the distribution aspect of this algorithm and give
a comparison of the proposed approach with a classical Apriori-like distributed algorithm, using both analytical and experimental
studies. We find that under a wide range of conditions and datasets, the performance of a distributed Apriori-like algorithm
is not related to global strategies of pruning since the performance of the local Apriori generation is usually characterized
by relatively high success rates of candidate sets frequency at low levels which switch to very low rates at some stage, and
often drops to zero. This means that the intermediate communication steps and remote support counts computation and collection
in classical distributed schemes are computationally inefficient locally, and then constrains the global performance. Our
performance evaluation is done on a large cluster of workstations using the Condor system and its workflow manager DAGMan.
The results show that the presented approach greatly enhances the performance and achieves good scalability compared to a
typical distributed Apriori founded algorithm. 相似文献
47.
In this study, water and 80% of four organic solvents were employed to optimize the extraction of antioxidants from two species of foxtail millet’s insoluble fibers under the same temperature, time, and solid/solvent ratio. The results showed that the acetone was able to extract the maximum amount of antioxidants (2.32 mg/g fiber for white specie and 3.86 mg/g fiber for yellow specie) followed by methanol and propanol from both samples. The neutral and the ethanol on the other hand extracted small amount of the antioxidants from the two fiber materials. While considerable level of Total Polyphenols Content (TPC) was recorded in both the water and the organic solvents’ extracts, only traces of Total Flavonoid content (TFC) were observed in water, methanol and ethanol extracts. Propanol and acetone extracts was negative to the TFC test. 相似文献
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In situ studies of bovine serum albumin adsorption onto functionalized polystyrene latices monitored with a quartz crystal microbalance technique 下载免费PDF全文
Manel Beragoui Chadlia Aguir Mohamed Khalfaoui Eduardo Enciso Maria José Torralvo Laurent Duclaux Laurence Reinert Marylène Vayer Abdelmottaleb Ben Lamine 《应用聚合物科学杂志》2015,132(23)
The adsorbability of bovine serum albumin (BSA) onto poly(styrene‐co‐itaconic acid) (PS–IA), poly(styrene‐co‐hydroxyethyl methacrylate) (PS–HEMA), poly(styrene‐co‐acrylic acid) (PS–AA), and poly(styrene‐co‐methacrylic acid) (PS–MAA) latices were investigated with a quartz crystal microbalance. The amount adsorbed onto the functionalized latices, except for PS–MAA, was greater than that adsorbed onto polystyrene (PS) latex. To explain this result, two kinds of interaction forces were considered, hydrogen bonding and hydrophobic interactions, whereas electrostatic interaction was assumed to be small. When comparing the two extremes of hydrophobic interaction and hydrogen bonding, the latter was stronger. The corrected adsorption mass suggested that the BSA molecules were adsorbed onto the PS–MAA latex in a side‐on mode. However, in the case of the PS, PS–IA, PS–HEMA, and PS–AA latices, the BSA molecules were probably adsorbed in multiple layers. The presence of the BSA in the latex particle surface was verified by attenuated total reflectance/Fourier transform infrared spectroscopy and atomic force microscopy. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42055. 相似文献
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