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Search Results: 1 - 10 of 474632 matches for " Marco A. Mesquita "
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Aggregate Planning for a Large Food Manufacturer with High Seasonal Demand
Flávia M. Takey,Marco A. Mesquita
Brazilian Journal of Operations & Production Management , 2010,
Abstract: This study was motivated by the poor inventory management performance in a Brazilian food company with a high seasonal demand. It was clearly recognized that the best inventory management would depend on improvements in demand forecasting and in the production planning process itself. In order to deal with the identified problems, an aggregate production planning model based on linear programming has been developed. The model determines the monthly production rates and inventory levels of finished products as well as the work-force requirements to accomplish productions plans. A simple disaggregating method, which searches for equal run out times, translates the aggregate plans into a detailed master production schedule for a shorter horizon of three months. With the effective usage of this model, and improvements in the demand forecasting processes, a global reduction of inventory levels of both raw materials and final products can be achieved.
Perdas na colheita mecanizada de soja no estado de Minas Gerais
Campos, Marco A. O.;Silva, Rouverson P. da;Carvalho Filho, Alberto;Mesquita, Hugo C. B.;Zabani, Samir;
Engenharia Agrícola , 2005, DOI: 10.1590/S0100-69162005000100023
Abstract: this work aimed the evaluation of soybean mechanical harvesting in minas gerais state, during 2002/2003 soybean crop, comparing grain losses according to harvester age, harvesting ground speed, track system (axial and radial) and property condition (proper or rented). ground speed and tracking cylinder rotation were also studied except when they were evaluated as variable function. the results indicate that the harvesters up to five years old, independent of their rate of annual use, had lesser losses than the harvesters with more than six years. the proper harvesters had presented minors losses when comparing with rented and the machines with axial track system presented minors losses than those with radial track system.
Sea-land limits: a case study
Mesquita, Afranio R. de;Blitzkow, Denizar;Fran?a, Carlos A. S.;Trabanco, Jorge L. A.;Corrêa, Marco A.;Monteiro, Mauro Q.;
Anais da Academia Brasileira de Ciências , 2011, DOI: 10.1590/S0001-37652011000400009
Abstract: the limits between sea and land were estimated at "pulso" beach located in the southeastern brazilian shelf (φ = 23°33/17.4886"s; λ = 045° 13'13.0504"w - wgs84), between the island of s?o sebasti?o and the city of ubatuba, sp, brazil. the relative sea level of the year 1831 at "pulso" beach, as per brazilian law number 9760 dated from 1946, was estimated and materialized. the retro-estimation allowed the demarcation of the legal sea-land limits at "pulso" beach as per the terms of the law. the accuracy of the procedure for the transference of the long-term sea level from the research station of ubatuba to "pulso" beach was assessed by parallel work of geometrical leveling referred to the ibge (brazilian institute of geography and statistics) geodetic network. the motivation, the hypotheses (brest, cananeia and ipcc) and the methods here used are described, together with a short history of the legal sea-land limits. the results indicated that the legal sea-land limits at "pulso" beach are well within the beach area. they were determined as per law 9760, and there is the need to reactivate the national network of sea level gauge.
Cesarean Section Is Associated with Increased Peripheral and Central Adiposity in Young Adulthood: Cohort Study
Denise N. Mesquita, Marco A. Barbieri, Helena A. S. Goldani, Viviane C. Cardoso, Marcelo Z. Goldani, Gilberto Kac, Ant?nio A. M. Silva, Heloisa Bettiol
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066827
Abstract: Background Cesarean section (CS) has been associated with obesity, measured by body mass index (BMI), in some studies. It has been hypothesized that this association, if causal, might be explained by changes in gut microbiota. However, little is known about whether CS is also associated with increased adiposity as measured by indicators other than BMI. Objective: To assess the association between CS and indicators of peripheral and central adiposity in young adults. Methods The study was conducted on 2,063 young adults aged 23 to 25 years from the 1978/79Ribeir?o Preto birth cohort, S?o Paulo, Brazil. CS was the independent variable. The anthropometric indicators of adiposity were: waist circumference (WC), waist-height ratio (WHtR), waist-hip ratio (WHR), tricipital skinfold (TSF), and subscapular skinfold (SSF). The association between CS and indicators of adiposity was investigated using a Poisson model, with robust adjustment of variance and calculation of incidence rate ratio (IRR) with 95% confidence interval (95%CI), and adjustment for birth variables. Results Follow-up rate was 31.8%. The CS rate was 32%. Prevalences of increased WC, WHtR, WHR were 32.1%, 33.0% and 15.2%, respectively. After adjustment for birth variables, CS was associated with increased risk of adiposity when compared to vaginal delivery: 1.22 (95%CI 1.07; 1.39) for WC, 1.25 (95%CI 1.10;1.42) for WHtR, 1.45 (95%CI 1.18;1.79) for WHR, 1.36 (95%CI 1.04;1.78) for TSF, and 1.43 (95%CI 1.08;1.91) for SSF. Conclusion Subjects born by CS had a higher risk for increased peripheral and central adiposity during young adult age compared to those born by vaginal delivery. The association of CS with adiposity was consistently observed for all indicators and was robust after adjustment for a variety of early life confounders.
Adolescência e aids: avalia??o de uma experiência de educa??o preventiva entre pares
Ayres, José Ricardo de Carvalho Mesquita;Freitas, Angela Carvalho;Santos, Marco Antonio Silva dos;Saletti Filho, Haraldo César;Fran?a Júnior, Ivan;
Interface - Comunica??o, Saúde, Educa??o , 2003, DOI: 10.1590/S1414-32832003000100009
Abstract: preventive hiv/aids actions focusing on overcoming the limitations of interventions of a behavioral nature and incorporating concerns with the socio-cultural determinants of these behaviors currently constitute both a necessity and a gap. this article deals with a study on prevention in the school environment based on a strategy of reducing vulnerability. it is a qualitative and quantitative case study that, within the context of this strategy, evaluates the sida prevention work carried out by students who function as multiplying agents in a public high school in the outskirts of the city of s?o paulo. the following stands out in the results: the effectiveness of the proposal, broadly accepted and favorably absorbed by the school's students; the diversified profile of voluntary students acting as multiplying agents; and the tension between the cognitive-behavioral model and the social-constructivist model in the educational processes concretely operated by the multiplying agents. the article concludes that there is a possibility and interest in the action of students acting as multiplying agents from the standpoint of the strategies of reduction of vulnerability. it also points out the need to develop mechanisms for the recruitment and training of agents capable of problematizing and overcoming the said tension.
Surface degradation of glass ceramics after exposure to acidulated phosphate fluoride
Ccahuana, Vanessa Z.S.;?zcan, Mutlu;Mesquita, Alfredo M. M.;Nishioka, Renato S.;Kimpara, Estev?o T.;Bottino, Marco A.;
Journal of Applied Oral Science , 2010, DOI: 10.1590/S1678-77572010000200010
Abstract: objective: this study evaluated the surface degradation effect of acidulated phosphate fluoride (apf) gel exposure on the glassy matrix ceramics as a function of time. material and methods: disc-shaped ceramic specimens (n = 120, 10/per ceramic material) were prepared in stainless steel molds (inner diameter: 5 mm, height: 2 mm) using 6 dental ceramics: 3 indicated for ceramic-fused-to-metal (vita omega 900, carmen and vita titankeramik), 2 for all-ceramic (vitadur alpha and finesse? low fusing) and 1 for both types of restorations (ips d.sign). the specimens were wet ground finished, ultrasonically cleaned and auto-glazed. all specimens were subjected to calculation of percentage of mass loss, surface roughness analysis and topographical description by scanning electron microscopy (sem) before (0 min) and after exposure to 1.23 % apf gel for 4 min and 60 min representing short- and long-term etching effect, respectively. the data were analyzed using two-way anova with repeated measures and tukey's test (a=0.05). results: significant effect of the type of the ceramics (p=0.0000, p=0.0031) and exposure time (p=0.0000) was observed in both surface roughness and percentage of mass loss values, respectively. the interaction factor between both parameters was also significant for both parameters (p=0.0904, p=0.0258). both 4 min (0.44±0.1 - 0.81±0.2 mm) and 60 min (0.66±0.1 - 1.04±0.3 mm) apf gel exposure created significantly more surface roughness for all groups when compared to the control groups (0.33±0.2 - 0.68±0.2 mm) (p<0.05). there were no significant differences in percentage of mass loss between the ceramics at 4 min (p>0.05) but at 60 min exposure, ips d.sign showed the highest percentage of mass loss (0.1151±0.11). the mean surface roughness for vita titankeramik (0.84±0.2 mm) and finesse? low fusing (0.74.±0.2 mm) was significantly higher than those of the other ceramics (0.59±0.1 mm - 0.49±0.1 mm) and vita titankeramik (p<0.05) regardless of the exposure tim
Levantamento das práticas de programa??o detalhada da produ??o: um survey na indústria paulista
Giacon, Edivaldo;Mesquita, Marco Aurélio de;
Gest?o & Produ??o , 2011, DOI: 10.1590/S0104-530X2011000300004
Abstract: due to the instability of markets and the intense competition among companies, detailed scheduling has increasingly become a challenge to management. companies that focus on the improvement of ppc activities demand tools to meet their needs, such as the finite capacity scheduling tool, also known as advanced planning and scheduling system (aps) to improve delivery times, effective scheduling, and control of the firmed order. this paper aims to identify the needs and difficulties of the detailed production scheduling, the critical factors for implementation, and the benefits that the advanced scheduling systems (aps) can provide. the method used was a survey of companies affiliated to the federation of industries of s?o paulo (fiesp). the results showed that the detailed production scheduling is a complex activity for most companies, especially for those that adopt make to order strategy (mto). the majority of companies surveyed use the mrp planning model, but their goals can be more easily achieved with the use of advanced programming systems (aps). financial costs and lack of training are still limiting factors to implementing those systems.
Distin o, cultura de consumo e gentrifica o: o Centro Cultural Banco do Brasil e o mercado de bens simbólicos
Marco Estev?o de Mesquita Vieira
Sociedade e Estado , 2006, DOI: 10.1590/s0102-69922006000200013
Self-Play and Using an Expert to Learn to Play Backgammon with Temporal Difference Learning  [PDF]
Marco A. Wiering
Journal of Intelligent Learning Systems and Applications (JILSA) , 2010, DOI: 10.4236/jilsa.2010.22009
Abstract: A promising approach to learn to play board games is to use reinforcement learning algorithms that can learn a game position evaluation function. In this paper we examine and compare three different methods for generating training games: 1) Learning by self-play, 2) Learning by playing against an expert program, and 3) Learning from viewing ex-perts play against each other. Although the third possibility generates high-quality games from the start compared to initial random games generated by self-play, the drawback is that the learning program is never allowed to test moves which it prefers. Since our expert program uses a similar evaluation function as the learning program, we also examine whether it is helpful to learn directly from the board evaluations given by the expert. We compared these methods using temporal difference methods with neural networks to learn the game of backgammon.
A investiga??o sobre os modelos de ensino dos jogos desportivos
Gra?a,Amandio; Mesquita,Isabel;
Revista Portuguesa de Ciências do Desporto , 2007,
Abstract: the main goal of this paper is to review the literature related to the teaching games for understanding (tgfu) and the sport education model (se), which are presently the most influential models addressing the teaching of sport games. the scope of the review comprehends the contributions perceived to be relevant for examining the roots of the models; the theoretical essays and critical appraisals of the models; the proposals of revision and evolution trends for the models; the didactical literature associated to the models; the evolution of the empirical research directly focused on the models; and finally, the dialogue between the models and the challenges coming from new approaches to the teaching of games.
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