Perception-based animation rendering

In most currently produced computer generated animation there is significant visual information that is literally never seen because of the characteristics of the human visual system. By tailoring the rendering of animation images to match the characteristics of human visual perception, significant computational and image storage savings can be obtained while retaining perceived animation quality. Vision research indicates that the human visual system processes two information channels. The transient channel rapidly processes low spatial resolution full colour information. The sustained channel processes high spatial resolution luminance information at a much slower rate. This paper discusses how the rendering of animation images can be accomplished to match these perception characteristics and achieve significant savings while maintaining animation quality. Computation and storage savings of up to 80 per cent are possible. Several animation segments have been produced to demonstrate the viability of this approach.     

Logical foundations of multilevel databases

In this paper, we propose a formal model for multilevel databases. This model aims at being a generic model, that is it can be interpreted for any kind of database (relational, object-oriented …). Our model has three layers. The first layer corresponds to a model for a non-protected database. The second layer corresponds to a model for a multilevel database. In this second layer, we propose a list of theorems that must be respected in order to build a secure multilevel database. We also propose a new solution to manage cover stories without using the ambiguous technique of polyinstantiation. The third layer corresponds to a model for a MultiView database, that is, a database that provides at each security level a consistent view of the multilevel database. Finally, as an illustration, we interpret our 3-layer model in the case of an object-oriented database.     

从非洲土壤中分离新的产生脂肪酶的细菌

从采自非洲 (喀麦隆和加纳 )的 3 3个土样中分离得到的产生脂肪酶的细菌H 1 ,初步鉴定为假单胞菌属 .以菌株H 1为出发菌株 ,经紫外线照射和亚硝基胍处理 ,得诱变菌株H 58,其脂肪酶产生能力达 4 0U/mL .对菌株H 58进行生产能力的稳定性试验 ,结果良好 .连续传代 5次能保持良好的产脂肪性能 .     

The Origin of Magnetism in Mn‐Doped SrTiO3

An analysis of Mn substitution in SrTiO₃ is performed in order to understand the origin of reported spin coupling in lightly Mn‐doped SrTiO₃. The spin glass state magnetoelectrically coupled to the dipolar glass state has previously been reported for SrTiO₃ substituted with only 2% of Mn on the B‐site. An analysis of the substitution mechanism for A‐ and B‐site doping shows a strong influence of processing conditions, such as processing temperature, oxygen partial pressure, and off‐stoichiometry. The required conditions for a site‐selective substitution are defined, which yield a single‐phase and almost defect‐free perovskite. Magnetic measurements show no magnetic anomalies resulting from spin coupling and only a simple paramagnetic behavior. Magnetic anomalies are observed only for the samples in which Mn is misplaced within the cation sublattice of the SrTiO₃ perovskite. This occurs due to improper material processing, which causes initially unpredicted changes in the valence state of the Mn and results in the formation of structural defects and irregularities associated with segregation and nucleation of the magnetic species. Previously reported spin coupling in Mn‐doped SrTiO₃ is not an intrinsic phenomenon and cannot be treated as a spin glass.     

Causal attributions for school-related problems: Teacher perceptions and teacher feedback.

Conducted 2 studies with a total of 54 teachers to examine classroom teachers' attributions for severe school problems. In both studies, teachers who had referred a student for psychological services were asked to assign causality for the referral problem. In Exp II, teacher praise and criticism of referred students were examined as functions of causal attributions. Both studies show that teachers held student factors more responsible for classroom problems than teacher factors and that teachers' attributions varied somewhat for learning vs behavior problems. Exp II indicated that problem students perceived as lacking motivation were criticized more often by their teachers. Relationship of the results to attribution theory and teacher attribution research is discussed, and further research conducted in naturalistic settings is recommended. (22 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Color-Word Test performance and drive regulation in three vocational groups.

Performance on the Color-Word Test (CWT) has been considered to reflect individual differences in constricted-flexible control, which is a dimension of styles of controlling and expressing drives. In Part I of this study, comparisons were made among CWT performances of groups which differ in such styles: 26 mathematicians, 24 creative writers, and 25 physicians. Several intergroup differences were found, but could not be accounted for in terms of constricted-flexible control. In Part II, CWT scores were compared to independent (mostly TAT) measures of drive regulation. Results were negative. It was concluded that CWT performance is relevant to molar adaptive behavior (vocation), but constricted-flexible control does not adequately account for variance on the test. More differentiated analysis of the CWT is recommended. (18 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Topological map induction using neighbourhood information of places

In topological mapping, perceptual aliasing can cause different places to appear indistinguishable to the robot. In case of severely corrupted or non-available odometry information, topological mapping is difficult as the robot is challenged with the loop-closing problem; that is to determine whether it has visited a particular place before.     

Adjoint sensitivity related to geometric parameters for mid-high frequency range vibroacoustics

Shape optimization issues under vibroacoustic criteria are considered in present paper. The adjoint-based gradient method was developed to minimize the energy density inside a cavity by changing its geometry parameters. The adjoint equations give the sensitivity information, which is subsequently used in a gradient-based minimization of a prescribed cost functional that models the energy density via Simplified Energy Method. Objective function is obtained by mapping 3D cavity surface on a 2D domain with the help of transformation function. Thus, the remeshing of the geometry is avoided and smoothness of the solution is reached. The optimization process is based on adjoint calculation of the gradient that leads to analytical expressions of the directional derivatives without additional computational cost. The proposed method is validated for the case of rectangular cavity modeled with patches of Bezier surfaces.     

Scenario-based verification in presence of variability using a synchronous approach

This paper presents a new model of scenarios, dedicated to the specification and verification of system be- haviours in the context of software product lines （SPL）. We draw our inspiration from some techniques that are mostly used in the hardware community, and we show how they could be applied to the verification of software components. We point out the benefits of synchronous languages and mod- els to bridge the gap between both worlds.     

Infrared synchrotron radiation from bending magnet and edge radiation sources for the study of orientation and conformation in anisotropic materials

Over the last decade the use of synchrotron infrared microspectroscopy to spatially discriminate chemical and structural features in many different types of materials has grown considerably and has made significant impact in numerous research areas, in particular, in biological sciences and medicine. Although the brightness advantage of the synchrotron infrared (IR) source is well accepted as the key to high spatial discrimination, little attention has been given to measure the polarization properties of the synchrotron light at the sample stage in IR microscopy. In this work the intrinsic polarization of the IR source and its consequences for the study of anisotropic materials are discussed. The polarization characteristics of predominantly bending magnet radiation and predominantly edge radiation sources were measured at the microscope focus and compared. To illustrate the direct use of the intrinsic polarization of these sources in microscopy, the orientation and conformational details of a drawn polymer sample are considered.