Let S be a smooth affine algebraic curve, and let S̊ be the Riemann surface obtained by removing a point from S. We provide evidence for the congruence subgroup property of mapping class groups by showing that the congruence kernel ker ( M̂od(S̊)→ Out ( π̂1(S̊) )) lies in the centralizer of every braid in Mod(S̊). As a corollary, we obtain a new proof of Asada’s theorem that the congruence subgroup p...

This paper proposes an econometric procedure that allows the estimation of the pricing kernel without either any assumptions about the investors preferences or the use of the consumption data. We propose a model of equity price dynamics that allows for (i) simultaneous consideration of multiple stock prices, (ii) analytical formulas for derivatives such as futures, options and bonds, and (iii) ...

J a n u a r y / F e b r u a r y 1 9 9 9 I E E E S o f t w a r e 6 5 ost Unix kernels are monolithic1,2; that is, the kernel is a (normally big) piece of compact code, in which all functions share a common space and are tightly related. When they need to be updated, they must be relinked and reinstalled and the system rebooted before the changes can take effect. This makes modifying them, by add...

Sparse additive models are families of d-variate functions that have the additive decomposition f = ∑ j∈S f ∗ j , where S is an unknown subset of cardinality s ≪ d. We consider the case where each component function f j lies in a reproducing kernel Hilbert space, and analyze an l1 kernel-based method for estimating the unknown function f . Working within a highdimensional framework that allows ...

Fatty acids esters were produced from two Nigerian lauric oils, palm kernel oil and coconut oil, by transesterification of the oils with different alcohols using PS30 lipase as a catalyst. In the conversion of palm kernel oil to alkyl esters (biodiesel), ethanol gave the highest conversion of 72%, t-butanol 62%, 1-butanol 42%, n-propanol 42% and iso-propanol 24%, while only 15% methyl ester was...

Pangdahai is a traditional Chinese drug, specifically described in the Chinese Pharmacopoeia as the seeds of Sterculia lychnophora Hance. Here, we separated S. lychnophora husk and kernel, analyzed the nutrient contents, and investigated the inhibitory effects of S. lychnophora ethanol extracts on cariogenic properties of Streptococcus mutans, important bacteria in dental caries and plaque form...

Sparse additive models are families of d-variate functions that have the additive decomposition f∗ = ∑ j∈S f ∗ j , where S is a unknown subset of cardinality s d. We consider the case where each component function f∗ j lies in a reproducing kernel Hilbert space, and analyze a simple kernel-based convex program for estimating the unknown function f∗. Working within a high-dimensional framework t...

Given a curve Γ⊂C with specified regularity, we investigate boundedness and positivity for certain three-point symmetrization of Cauchy-like kernel KΓ whose definition is dictated by the geometry complex function theory domains bounded Γ. Our results show that S[ReKΓ] S[ImKΓ] (namely, symmetrizations real imaginary parts KΓ) behave very differently from their counterparts Cauchy previously stud...

Kernel rootkits, as one of the most elusive types of malware, pose significant challenges for investigation and defense. Among the most notable are persistent kernel rootkits, a special type of kernel rootkits that implant persistent kernel hooks to tamper with the kernel execution to hide their presence. To defend against them, an effective approach is to first identify those kernel hooks and ...