90 research outputs found
An improvement of a cellular manufacturing system design using simulation analysis
No full textCell Formation (CF) problem involves grouping the parts into part families and machines into manufacturing cells, so that parts with similar processing requirements are manufactured within the same cell. Many researches have suggested methods for CF. Few of these methods; have addressed the possible existence of exceptional elements (EE) in the solution and the effect of correspondent intercellular movement, which cause lack of segregation among the cells. This paper presents a simulation-based methodology, which takes into consideration the stochastic aspect in the cellular manufacturing (CM) system, to create better cell configurations. An initial solution is developed using any of the numerous CF procedures. The objective of the proposed method which provides performances ratings and cost-effective consist in determine how best to deal with the remaining EE. It considers and compares two strategies (1) permitting intercellular transfer and (2) exceptional machine duplication. The process is demonstrated with a numerical exampleCell Formation; Exceptional Elements; Simulation; Alternative costs; Improvement
Stability of receding traveling waves for a fourth order degenerate parabolic free boundary problem
No full text Consider the thin-film equation h t +(hh yyy ) y =0 with a zero contact angle at the free boundary, that is, at the triple junction where liquid, gas, and solid meet. Previous results on stability and well-posedness of this equation have focused on perturbations of equilibrium-stationary or self-similar profiles, the latter eventually wetting the whole surface. These solutions have their counterparts for the second-order porous-medium equation h t −(h m ) yy =0, where m>1 is a free parameter. Both porous-medium and thin-film equation degenerate as h↘0, but the porous-medium equation additionally fulfills a comparison principle while the thin-film equation does not. In this note, we consider traveling waves h=[Formula presented]x 3 +νx 2 for x≥0, where x=y−Vt and V,ν≥0 are free parameters. These traveling waves are receding and therefore describe de-wetting, a phenomenon genuinely linked to the fourth-order nature of the thin-film equation and not encountered in the porous-medium case as it violates the comparison principle. The linear stability analysis leads to a linear fourth-order degenerate-parabolic operator for which we prove maximal-regularity estimates to arbitrary orders of the expansion in x in a right-neighborhood of the contact line x=0. This leads to a well-posedness and stability result for the corresponding nonlinear equation. As the linearized evolution has different scaling as x↘0 and x→∞ the analysis is more intricate than in related previous works. We anticipate that our approach is a natural step towards investigating other situations in which the comparison principle is violated, such as droplet rupture. Accepted author manuscriptAnalysi
Euphoria versus dysphoria differential cognitive roles in religion?
No full textReligious believers experience a range of emotions in their religious lives (Kim-Prieto & Diener, 2009; Roberts, 2007; Whitehouse, 2004). Some religious practices create intense feelings of joy and love (Malinar & Basu, 2007; Martin & Runzo, 2007). Other religious practices cause fear and pain (Alcorta & Sosis, 2005; Jackson, 2007; Whitehouse, 2007). Why does religion inspire such a diversity of affect
الاتجاهات الحديثة للوقاية من الجريمة: كيف تتج ّدد المقاربات الكلاسيكية في العصر الرقمي؟
No full textإن عولمة الجريمة وظهور أشكال جديدة لها زادا من انتشار العنف ومن التهديدات على الأفراد والمجتمعات. وبات من الضروري اتباع الاتجاهات الحديثة في الوقاية من الجريمة، لما فيها من استباقية وتشاركية وتنشيط لدور الفرد والبيئة المحلية. لهذا تهدف الورقة إلى بيان اتجاه أحدث المقاربات والممارسات في الوقاية من الانحراف والجريمة. واستنادا إلى منهجية تحليلية، تقدِّم هذه الورقة فحصا للاتجاهات الجديدة في الجريمة بوصفها أرضية تحلَّل على أساسها المبادرات والممارسات والإستراتيجيات الحديثة في الوقاية من الجريمة؛ وذلك لما لها من دور توجيهي وإرشادي وتأثير في مدى نجاعة البعد الاستباقي للبرامج الوقائية. ويمثل مؤتمر كيوتو، المنعقد في مارس 2021م، مدخلًا نظريا لرصد الاتجاهات العالمية في مجال الوقاية من الجريمة، قبل تحليل أحدث المقاربات الوقائية. وتظهر نتائج التحليل أن الوقاية بالتنمية الاجتماعية، والوقاية الموقفية، والوقاية القائمة على المجتمع المحلي تبقى المقاربات الأكثر اتباعا وفعالية. كما تبين النتائج أن الوقاية القائمة على دور المدينة والوقاية القائمة على التنسيق الإقليمي والدولي هما أحدث التوجهات في الممارسات الحديثة. وستقدِّم هذه الورقة أيضا أهم الأدوات الحديثة في متابعة برامج الوقاية ونماذج لإستراتيجيات شاملة، وتحليلا مختصرا لدور العلوم الجنائية في تطوير اتجاهات الوقاية الحديثة. ومن أهم توصيات الورقة، جعل برامج الوقاية القائمة على التنمية الاجتماعية والعوامل النفسية ذات أولوية قصوى والعمل على إشراك مكونات المجتمع المحلي المجتمع المدني، وإحداث مرصد عربي للجريمة والعنف والانحراف، يكون جامعًا لمعطيات الدول العربية ومنسقًا لإستراتيجيات الوقاية من الجريمة، وإحداث منصة لتبادل التجارب والخبرات والممارسات المثلى، وإنشاء مركز عربي لتمكين الشباب
Chapitre 01. Percept – Concept – Décision : les secrets d'un cheminement émotif et motivé
No full textSolving-Oriented and Domain-Oriented Knowledge Structures: Their Application to Debugging Problem Solving Activity
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Analysis of a two fluid model and its comparison with MHD system
No full textIn this thesis, we study a two fluid system which describes the motion of two charged particles in a strict neutral incompressible plasma. We study the well-posdness of the system in both space dimensions two and three. Regardless of the size of the initial data, we prove the global well-posedness of the Cauchy problem when the space dimension is two. In space dimension three, we construct global weak-solutions, and we prove the local well-posedness of Kato-type solutions. These solutions turn out to be global when the initial data are sufficiently small. We also study the stability of the solution around zero given that the initial data is small and has sufficient regularity. It turns out that our system is a system of regularity-loss and the L2 norm of lower derivatives of the solution decays. At last, this two fluid system can be used to derive the classic MHD at least formally. Arsenio, Ibrahim and Masmoudi (2015) proved that the two fluid system converges to MHD under some constraints. We showed numerically that the two fluid system converges to MHD with no such constraint and found the approximate converge rate.Graduat
A finite mixture model of geometric distributions for lossless image compression
No full textInternational audienceIn this paper, we proposed a new geometric finite mixture model-based adaptive arithmetic coding (AAC) for lossless image compression. Applying AAC for image compression, large compression gains can be achieved only through the use of sophisticated models that provide more accurate probabilistic descriptions of the image. In this work, we proposed to divide the residual image into non-overlapping blocks, and then we model the statistics of each block by a mixture of geometric distributions of parameters estimated through the maximum likelihood estimation using the expectation–maximization algorithm. Moreover, a histogram tail truncation method within each predicted error block is used in order to reduce the number of symbols in the arithmetic coding and therefore to reduce the effect of the zero-occurrence symbols. Experimentally, we showed that using convenient block size and number of mixture components in conjunction with the prediction technique median edge detector, the proposed method outperforms the well known lossless image compressors
Postface. Alliant motivation, émotion, affect et cognition. Blending Motivation, Emotion, Affect, and Cognition
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