An Optimized Content-Aware Authentication Scheme for Streaming JPEG-2000 Images Over Lossy Networks

This paper proposes an optimized content-aware authentication scheme for JPEG-2000 streams over lossy networks, where a received packet is consumed only when it is both decodable and authenticated. In a JPEG-2000 codestream, some packets are more important than others in terms of coding dependency and image quality. This naturally motivates allocating more redundant authentication information for the more important packets in order to maximize their probability of authentication and thereby minimize the distortion at the receiver. Towards this goal, with the awareness of its corresponding image content, we formulate an optimization framework to compute an authentication graph to maximize the expected media quality at the receiver, given specific authentication overhead and knowledge of network loss rate. System analysis and experimental results demonstrate that the proposed scheme achieves our design goal in that the rate-distortion (R-D) curve of the authenticated image is very close to the R-D curve when no authentication is required     

Adolescents' theories about the development of their relationships with parents.

Assessed 100 undergraduates' developmental theories about their affective relationships with their parents, using a retrospective method. Ss used drawings and questionnaire ratings to portray their relationships with parents at 5 points between infancy and the present. From infancy to their current age, Ss portrayed their relationships in 2 major ways: They perceived themselves as gaining in responsibility, dominance, independence, and similarity from infancy to the present, whereas they portrayed their parents as experiencing a decline on these dimensions. For variables indicating closeness and love, however, there was a striking discontinuity in these linear trends: Although Ss perceived linear trends from infancy to adolescence, they depicted their current relationships as involving a great deal more love and closeness. They also portrayed their relationships with mothers and fathers somewhat differently. More responsibility was felt toward the mothers and they were portrayed as especially friendly, but Ss felt more similar to their fathers, whom they perceived as dominant. Results suggest that late adolescents construct theories of the affective components of their relationships with their parents to serve the needs of separation while maintaining a close affective tie to the parents. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transmission electron microscopy observation of vitrinite from Liddell bituminous coal treated with tetralin

To assess the suitability of transmission electron microscopy (TEM) for investigating the detailed process of coal/solvent interaction, TEM observations have been made of small blocks of Liddell vitrinite that had been treated with tetralin in an autoclave at 320 and 350 °C. In vitrinite treated at 320 °C cell cavity fillings became porous, while the walls between cell cavities remained uniform and showed no internal texture. In vitrinite particles treated with tetralin at 350 °C two zones were recognizable at the edges of the particles: a more electron-dense inner zone and a less electron-dense outer zone. Also present in these specimens were plastospheres consisting of two different materials, primary vitroplast (a more electron-dense core) and secondary vitroplast (a less electron-dense crust). Such detailed texture has not been observed with incident light microscopy, and TEM techniques provide useful information not previously obtainable.     

Depressive symptomatology during pregnancy: Evidence for an association with decreased fetal growth in pregnancies of lower social class women.

The relationship between depressive symptom scores on the Center for Epidemiological Studies Depression Scale (CES-D; L. S. Radloff, 1977) at each trimester of pregnancy and a decrement in either fetal growth or gestational duration was evaluated among 666 pregnant women. There was no association overall, but among 222 women from lower occupational status households, each unit increase on the CES-D at 28 weeks gestation was associated with a reduction of 9.1 g (95% confidence interval [CI]?=?–16.0, –2.3) in gestational-age-adjusted birth weight. When missing data were multiply imputed, the estimate was –4.6 g (95% CI?=?–10.7, 1.5). CES-D score was unrelated to fetal growth or gestational duration in analyses among other potentially high-risk subgroups: smokers, women with a history of adverse outcome, and women with social vulnerabilities. These results raise the possibility that among lower status women, depressive mood may be associated with restricted fetal growth. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

SUSPENSION EFFECT IN POTENTIOMETRY

According to the capacitor model, the potential development of membrane electrodes is the result of adsorption of ions or charged particles on the electrode surface forming a double layer and capacitor. Our results differ from those previously reported in that the adsorption of charged particles at the pH glass electrode interface is the main cause of the suspension effect rather than the reference electrode effect. Charged particles, if adsorbed on the SCE tip opening, may cause minor suspension effects on the reference electrode potential. Our results have demonstrated how previous investigators misused the H⁺-form exchange resins in the suspension effect study, ignoring the exchange reaction between the H⁺ ion and K⁺ ion. The pH glass electrode, antimony electrode and lead electrode and ion exchange resin, activated carbon, graphite and silica gel were used in the study.     

Synthesis,characterization and crystal structure of (cis-P,P′-diphenyl-1,4-diphospha-cyclohexane)molybdenum(0)tetracarbonyl

The preparation of the novel (cis-P,P′-diphenyl-1,4-diphospha-cyclohexane)molybdenum(0)tetracarbonyl complex is described. The spectral data and X-ray structure of the title complex are reported. The results of the crystallographic work show a distorted octahedral complex around the metal center, the first of its kind reported for the P,P′-diphenyl-1,4-diphospha-cyclohexane ligand.     

妖魔网游谁之过？

出个谜语：谜面是精神鸦片、电子海洛因。相信你不用坐到轮椅上就学会抢答了，谜底是——网络游戏。     

Cognitive processing and trait anxiety in typically developing children: Evidence for an interpretation bias.

In this study the authors examined whether increases in children's levels of self-reported trait anxiety would be related to their interpretation of ambiguous stimuli. By using the Revised Children's Manifest Anxiety Scale (C. R. Reynolds & B. O. Richmond, 1985), the authors obtained measurements of anxiety for 40 children ages 7 and 9 years. Interpretation of ambiguous stimuli was measured by using a pictorial homophone task, where homophones could be interpreted as either threatening or neutral. Results showed that children's interpretations of homophones was significantly predicted by level of anxiety. Increases in levels of trait anxiety were positively associated with threatening interpretations of homophones. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessing adult adjustment to relationship separation: The Psychological Adjustment to Separation Test (PAST).

Relationship separation is associated with substantial adult adjustment problems. The Psychological Adjustment to Separation Test (PAST) was developed as a self-report measure of 3 key dimensions of separation adjustment problems: lonely negativity, ex-partner attachment and coparenting conflict. Two independent samples (n = 219 and n = 169, respectively) of recently separated adults, 60% of whom had children, completed the PAST and other measures of general adjustment. Exploratory and confirmatory factor analyses demonstrated a replicable 3-factor structure, with each factor showing satisfactory test-retest and internal reliability and good convergent and discriminant validity. The PAST meets initial criteria for a potentially useful new measure of adult separation adjustment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Preparation and analysis of some food fats and oils for fatty acid content by gas-liquid chromatography

The fatty acid compositions of some food fats and oils were determined by gas-liquid chromatography (GLC) before and after application of reagents and conditions of some extraction procedures. The extraction procedures studied had a nonsignificant effect on the fatty acid compositions. Procedures leading to methyl ester formation through a series of room temp reactions were selected over procedures requiring higher temp reactions, on the basis of yield of products, fatty acid compositions of food lipids of simple composition, or both. These procedures were then used to prepare some food fats and oils for analysis by GLC and the fatty acid compositions determined in this manner are presented. Food Composition Laboratory, ARS, USDA.