9,319 research outputs found
WWW Programming using computational logic systems (and the PiLLoW/Ciao library)
No full textWe discuss from a practical point of view a number of issues involved in writing Internet and WWW applications using LP/CLP systems. We describe Pd_l_oW, a public-domain Internet and WWW programming library for LP/CLP systems which we argüe significantly simplifies the process of writing such applications. Pd_l_oW provides facilities for generating HTML structured documents, producing HTML forms, writing form handlers, accessing and parsing WWW documents, and accessing code posted at HTTP addresses. We also describe the architecture of some application classes, using a high-level model of client-server interaction, active modules. We then propose an architecture for automatic LP/CLP code downloading for local execution, using generic browsers. Finally, we also provide an overview of related work on the topic. The PiLLoW library has been developed in the context of the &- Prolog and CIAO systems, but it has been adapted to a number of popular LP/CLP systems, supporting most of its functionality
Estimates of norms in noncommutative Lp-spaces and applications
No full textCette thèse présente quelques résultats d’analyse sur les espaces Lp le plus souvent non commutatifs.La première partie exhibe de large classes de contractions sur des espaces Lp non commutatifsqui vérifient l’analogue non commutatif de la conjecture de Matsaev. De plus, cette partie fournitune comparaison entre certaines normes apparaissant naturellement dans ce domaine. La deuxièmepartie traite des fonctions carrées. Le premier résultat principal énonce que si T est un opérateurR-Ritt sur un espace Lp alors les fonctions carrées associées sont équivalentes. Le second résultatprincipal est une caractérisation de certaines estimations carrées utilisant les dilatations. La troisièmepartie de cette thèse introduit de nouvelles fonctions carrées pour les opérateurs de Ritt définis surdes espaces Lp non commutatifs. Le résultat principal est qu’en général ces fonctions carrées ne sontpas équivalentes. Cette partie contient aussi un résultat d’équivalence entre la norme usuelle et unecertaine fonction carrée. La quatrième partie introduit un analogue non commutatif de l’algèbre deFigà-Talamanca-Herz Ap(G) sur le prédual naturel de l’espace d’opérateurs Mp,cb des multiplicateursde Schur complètement bornées sur l’espace de Schatten Sp.This thesis presents some results of analysis in Lp-spaces, especially often noncommutative. Thefirst part exhibits large classes of contractions on noncommutative Lp-spaces which satisfy the noncommutativeanalogue of Matsaev’s conjecture. Moreover, this part gives a comparison between variousnorms arising naturally from this field. The second part is devoted to square functions. The firstmain result states that if T is an R-Ritt operator on a Lp-space then the involved square functionsare equivalent. The second principal result is a characterization of some square functions estimatesin terms of dilations. In the third part of this thesis, we introduce some new square functions forRitt operators defined on noncommutative Lp-spaces. The main result is that these square functionsare generally not equivalent. This part also contains a result of equivalence between the usual normand some special square function. The fourth part introduces a noncommutative analogue of theFigà-Talamanca-Herz algebra Ap(G) on the natural predual of the operator space Mp,cb of completelybounded Schur multipliers on the Schatten space Sp
Decoupling and prices: determinant of dairy farmers’ choices? A model to analyse impacts of the 2003 CAP reform
No full textThe reform of European Common Agricultural Policy (CAP) in 2003 has resulted in substantial changes to the attribution of subsidies to dairy farmers. Moreover, dairy farmers are in also facing an unprecedented situation on the markets with the soaring prices of agricultural raw materials: they sell their products at a higher price (milk, meat and cereals), but must also cope with the increasing prices of concentrates. In this paper1, we discuss cross effects, on the productive strategy of French dairy farms, of the Luxemburg Agreement and the prices variations. A model based on mathematical programming has been privileged to determine how dairy farmers might re-evaluate their systems to identify optimal production plan. While respecting the principle of agent rationality (maximization of profit), the model incorporates the economic risk related to the volatility of the inputs and outputs prices. Thus the model maximises the expected utility of the income while taking into account a set of constraints: regulatory, structural, zootechnical, agronomic and environmental. The model is applied to four types of dairy farms to cope with the diversity of production systems in the west of France (“grazier” type, “semi intensive” type, “milk + cereals” type and “milk + young bulls” type). The model is used to produce quantitative estimations and support reflection through the simulation of the setting up of the Single payment scheme. The sensitivity of the results is discussed by taking into account several options of prices for cereals and livestock products. These may have a strong influence on the structure of the diet and, therefore, on the level of intensification of the forage area. The results show that the implementation of the CAP reform encourages farmers to substitute a part of corn silage by grass in the diet. However, the rising price of agricultural production encourages, on the contrary, farmers to intensify their system in order to free up land for growing cereals. We also observe that a decrease of the young bulls fattening activity to develop cereal crops is also economically profitable.dairy farm, single payment, price variation, Agricultural and Food Policy, Livestock Production/Industries,
ℓ1-contractive maps on noncommutative Lp-spaces
No full textInternational audienceLet T:Lp(M)→Lp(N) be a bounded operator between two noncommutative Lp-spaces, 1⩽p<∞. We say that T is ℓ1-bounded (respectively ℓ1-contractive) if T⊗Iℓ1 extends to a bounded (respectively contractive) map from Lp(M;ℓ1) into Lp(N;ℓ1). We show that Yeadon's factorization theorem for Lp-isometries, 1⩽p≠2<∞, applies to an isometry T:L2(M)→L2(N) if and only if T is ℓ1-contractive. We also show that a contractive operator T:Lp(M)→Lp(N) is automatically ℓ1-contractive if it satisfies one of the following two conditions: either T is 2-positive; or T is separating, that is, for any disjoint a,b∈Lp(M) (i.e.\ a∗b=ab∗=0), the images T(a),T(b) are disjoint as well
LP Decoding Excess over Symmetric Channels
No full textWe consider the problem of Linear Programming (LP) decoding of binary linear codes. The LP excess lemma was introduced by the first author, B. Ghazi, and R. Urbanke (IEEE Trans. Inf. Th., 2014) as a technique to trade crossover probability for 'LP excess' over the Binary Symmetric Channel. We generalize the LP excess lemma to discrete, binary-input, Memoryless, Symmetric and LLR-Bounded (MSB) channels. As an application, we extend a result by the first author and H. Audah (IEEE Trans. Inf. Th., 2015) on the impact of redundant checks on LP decoding to discrete MSB channels. © 2015 IEEE
A Sobolev estimate for radial lp-multipliers on a class of semi-simple lie groups
No full textLet G be a semi-simple Lie group in the Harish-Chandra class with maximal compact subgroup K. Let ΩK be minus the radial Casimir operator. Let 1 4 dim(G/K) < SG < 1 2 dim(G/K), s ∈ (0, SG] and p ∈ (1,∞) be such that(1 p - 1 2 )< s 2SG . Then, there exists a constant CG,s,p > 0 such that for every m ∈ L∞(G) ∩ L2(G) bi-K-invariant with m ∈ Dom(Ωs K) and Ωs K(m) ∈ L2SG/s(G) we have, (0.1) ∥Tm : Lp(G) → Lp( G)∥ ≤ CG,s,p∥Ωs K(m)∥ L2SG/s(G), where Tm is the Fourier multiplier with symbol m acting on the noncommutative Lp-space of the group von Neumann algebra of G. This gives new examples of Lp-Fourier multipliers with decay rates becoming slower when p approximates 2.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Analysi
Stability properties of stochastic maximal Lp-regularity
No full textIn this paper we consider Lp-regularity estimates for solutions to stochastic evolution equations, which is called stochastic maximal Lp-regularity. Our aim is to find a theory which is analogously to Dore’s theory for deterministic evolution equations. He has shown that maximal Lp-regularity is independent of the length of the time interval, implies analyticity and exponential stability of the semigroup, is stable under perturbation and many more properties. We show that the stochastic versions of these results hold
On Lp-solvability of stochastic integro-differential equations
No full textIn this thesis, we investigate the Lp-solvability of a class of (possibly) degenerate
stochastic integro-differential equations (SIDEs) of parabolic type, which includes the
Zakai equation in nonlinear filtering for jump diffusions and the Kolmogorov equations
for jump diffusions. We first study the solvability of integro-differential equations in the
same type but without randomness. Then we present an Itˆo formula for the Lp-norm of
jump processes having stochastic differentials in Lp-spaces, which can be used to study
the solvability of SIDEs. In the last chapter, existence and uniqueness of the solutions
to SIDEs are established in Bessel potential spaces
Management accounting and control systems in organisations using LP
No full textTitel: Verksamhetsstyrning i företag som använder Lean Production Bakgrund och problemdiskussion: Den ökade konkurrensen på marknader har inneburit att företag sökt nya sätt att utveckla och effektivisera sin verksamhet. Något som har resulterat i att många företag valt att införa strategin ”Lean Production” (LP). Flera forskare menar att traditionell ekonomistyrning inte är anpassad och därmed inte lämplig vid användandet av LP, detta har inneburit att företag som börjat använda LP varit tvungna att anpassa styrningen för att stödja de förändringar som strategin gett upphov till. Syfte: Syftet med denna studie är att beskriva och analysera vad som karaktäriserar verksamhetsstyrningen hos företag som använder LP, vidare analysera hur verksamhetsstyrningen förändrats sedan företagen började använda LP. Avslutningsvis syftar studien till ge förslag på hur studiens företag kan utveckla sin verksamhetsstyrning för att öka stödet till LP. Metod: En kvalitativ flerfallstudie genomfördes på de tre företagen Orthex Sweden AB, Emballator Växjöplast samt Emballator Lagan Plast. Empiriinsamlingen skedde genom semistrukturerade intervjuer, observationer samt relevant material. Teorin underbyggdes av relevant litteratur, artiklar och internetkällor. Teori: I kapitlet ingår LP, verksamhetsstyrning, verksamhetsstyrning i förändring. Slutsats: Det finns karaktäriserande drag mellan studiens företag, vidare karaktäriseras inte företagens verksamhetsstyrning av olika mognadsfaser. Studiens företag har alla genomgått förändringar till följd av LP och en ökad anpassning mot LP kan även göras hos respektive företag.Background and Problem discussion: Due to increased competitiveness on markets, companies have been searching for new ways to develop and make their activities streamlined. This has lead to the fact that many companies started using Lean Production (LP). Several researchers demonstrates that traditional management accounting and control systems is not appropriate and therefore not suitable for the use of LP, this has meant that the companies started using LP had to adapt management to support the changes resulting from the Strategy. Purpose: The purpose of this study is to describe and analyze the characteristics of Management accounting and control systems in companies using LP, further analyze how performance management changed since the companies started using LP. Finally, the study aims to provide suggestions on how the companies can develop their Management accounting and control systems in order to increase support for the LP. Method: A qualitative multi-case study was conducted on the three companies, Orthex Sweden AB, Emballator Växjöplast and Emballator Lagan Plast. The empirical data was collected through semi-structured interviews, observations and relevant materials. The theory was supported by relevant literature, articles and internet sources. Theory: The chapter includes LP, Management accounting and control systems, Management accounting and control systems in change. Conclusion: There are characterizing traits between the companies, but we can not characterize the management accounting and control systems of various stages of maturity. The study's companies have all undergone changes as a result of LP and increased adaptation to LP can also be made for respective companies
Management accounting and control systems in organisations using LP
No full textTitel: Verksamhetsstyrning i företag som använder Lean Production Bakgrund och problemdiskussion: Den ökade konkurrensen på marknader har inneburit att företag sökt nya sätt att utveckla och effektivisera sin verksamhet. Något som har resulterat i att många företag valt att införa strategin ”Lean Production” (LP). Flera forskare menar att traditionell ekonomistyrning inte är anpassad och därmed inte lämplig vid användandet av LP, detta har inneburit att företag som börjat använda LP varit tvungna att anpassa styrningen för att stödja de förändringar som strategin gett upphov till. Syfte: Syftet med denna studie är att beskriva och analysera vad som karaktäriserar verksamhetsstyrningen hos företag som använder LP, vidare analysera hur verksamhetsstyrningen förändrats sedan företagen började använda LP. Avslutningsvis syftar studien till ge förslag på hur studiens företag kan utveckla sin verksamhetsstyrning för att öka stödet till LP. Metod: En kvalitativ flerfallstudie genomfördes på de tre företagen Orthex Sweden AB, Emballator Växjöplast samt Emballator Lagan Plast. Empiriinsamlingen skedde genom semistrukturerade intervjuer, observationer samt relevant material. Teorin underbyggdes av relevant litteratur, artiklar och internetkällor. Teori: I kapitlet ingår LP, verksamhetsstyrning, verksamhetsstyrning i förändring. Slutsats: Det finns karaktäriserande drag mellan studiens företag, vidare karaktäriseras inte företagens verksamhetsstyrning av olika mognadsfaser. Studiens företag har alla genomgått förändringar till följd av LP och en ökad anpassning mot LP kan även göras hos respektive företag.Background and Problem discussion: Due to increased competitiveness on markets, companies have been searching for new ways to develop and make their activities streamlined. This has lead to the fact that many companies started using Lean Production (LP). Several researchers demonstrates that traditional management accounting and control systems is not appropriate and therefore not suitable for the use of LP, this has meant that the companies started using LP had to adapt management to support the changes resulting from the Strategy. Purpose: The purpose of this study is to describe and analyze the characteristics of Management accounting and control systems in companies using LP, further analyze how performance management changed since the companies started using LP. Finally, the study aims to provide suggestions on how the companies can develop their Management accounting and control systems in order to increase support for the LP. Method: A qualitative multi-case study was conducted on the three companies, Orthex Sweden AB, Emballator Växjöplast and Emballator Lagan Plast. The empirical data was collected through semi-structured interviews, observations and relevant materials. The theory was supported by relevant literature, articles and internet sources. Theory: The chapter includes LP, Management accounting and control systems, Management accounting and control systems in change. Conclusion: There are characterizing traits between the companies, but we can not characterize the management accounting and control systems of various stages of maturity. The study's companies have all undergone changes as a result of LP and increased adaptation to LP can also be made for respective companies
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