基于VMT的叶片模具曲面加工技术研究

本文研究了基于VMT的复杂曲面加工中关键技术问题，并探讨了虚拟制造技术在大型混凝土搅拌车拌筒叶片加工中的应用。     

Visual information processing in high-functioning individuals with autism spectrum disorders and their parents.

The authors assessed visual information processing in high-functioning individuals with pervasive developmental disorders (PDD) and their parents. The authors used tasks for contrast sensitivity, motion, and form perception to test visual processing occurring relatively early and late in the magnocellular-dorsal and parvocellular-ventral pathways. No deficits were found in contrast sensitivity for low or high spatial frequencies or for motion or form perception between individuals with PDD in comparison with a matched control group. Individuals with PDD performed equally with or better than controls on motion detection tasks. In addition, the authors did not find differences on any of the tasks between parents of the PDD group and matched control parents. These results indicate that high-functioning individuals with PDD and their parents are able to process visual stimuli that rely on early or late processing in the magnocellular-dorsal and parvocellular-ventral pathways as well as controls. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

世界博览会与信息空间的出现

19世纪出现的水晶宫和埃菲尔铁塔都是当时世界博览会的会场建筑？商时两者都在人类建筑史上占有不可替代的一页？本文通过独特的视角论速了博览会建筑与信息空间出现的内在联系。     

See what you want to see: Motivational influences on visual perception.

People's motivational states--their wishes and preferences--influence their processing of visual stimuli. In 5 studies, participants shown an ambiguous figure (e.g., one that could be seen either as the letter B or the number 13) tended to report seeing the interpretation that assigned them to outcomes they favored. This finding was affirmed by unobtrusive and implicit measures of perception (e.g., eye tracking, lexical decision tasks) and by experimental procedures demonstrating that participants were aware only of the single (usually favored) interpretation they saw at the time they viewed the stimulus. These studies suggest that the impact of motivation on information processing extends down into preconscious processing of stimuli in the visual environment and thus guides what the visual system presents to conscious awareness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parallel Processing in Visual Search Asymmetry.

The difficulty of visual search may depend on assignment of the same visual elements as targets and distractors-search asymmetry. Easy C-in-O searches and difficult O-in-C searches are often associated with parallel and serial search, respectively. Here, the time course of visual search was measured for both tasks with speed-accuracy methods. The time courses of the 2 tasks were similar and independent of display size. New probabilistic parallel and serial search models and sophisticated-guessing variants made predictions about time course and accuracy of visual search. The probabilistic parallel model provided an excellent account of the data, but the serial model did not. Asymptotic search accuracies and display size effects were consistent with a signal-detection analysis, with lower variance encoding of Cs than Os. In the absence of eye movements, asymmetric visual search, long considered an example of serial deployment of covert attention, is qualitatively and quantitatively consistent with parallel search processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Low energy cooling of the White Tower, functioning as a contemporary museum

Historical buildings are of significance not only because they preserve the cultural heritage of nations but also because of their representative character. However, as buildings they not necessarily provide satisfactory comfort and health conditions, despite the fact that they can be high-energy consumers. The Museum of Byzantine Culture in Thessaloniki has decided to convert the White Tower, a six-floor fortress dating back to the 15th century, into a contemporary city museum with means of audiovisual, virtual and information technologies. A study has been carried out in 2005–2006 to determine the possibilities, given the restrictions applying, to implement measures in order to establish and maintain satisfactory thermal comfort and indoor air quality conditions in the White Tower, whilst ensuring its unobstructed function as a contemporary city museum. The measurements and simulations carried out, together with the resulting suggested interventions are discussed in this paper.     

When Do Visual and Verbal Memories Conflict? The Importance of Working-Memory Load and Retrieval.

Examinations of interference between verbal and visual materials in working memory have produced mixed results. If there is a central form of storage (e.g., the focus of attention; N. Cowan, 2001), then cross-domain interference should be obtained. The authors examined this question with a visual-array comparison task (S. J. Luck & E. K. Vogel, 1997) combined with various verbal memory load conditions. Interference between tasks occurred if there was explicit retrieval of the verbal load during maintenance of a visual array. The effect was localized in the maintenance period of the visual task and was not the result of articulation per se. Interference also occurred when especially large silent verbal and visual loads were held concurrently. These results suggest central storage along with code-specific passive storage. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The role of the anterior commissure in callosal agenesis.

Two individuals with callosal agenesis (J.P. and M.M.) and 10 neurologically normal participants were tested on tasks requiring interhemispheric visual integration. M.M., whose anterior commissure was within normal limits, was much worse at matching colors and letters between visual fields than within visual fields, whereas J.P., whose anterior commissure was greatly enlarged, showed no evidence of interhemispheric disconnection. This suggests that in some cases of callosal agenesis, probably a minority, an enlarged anterior commissure may compensate for the lack of the corpus callosum. Neither acallosal participant showed interhemispheric disconnection on tasks requiring integration of location and orientation, however, suggesting that the anterior commissure plays no role in such tasks. These tasks may depend on subcortical commissures, such as the intertectal commissure. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

一种基于图像DC系数的多比特水印

提出了一种新的多比特水印算法。该算法把基于图像自身的水印信息嵌入到图像的DC系数中,通过视觉模型控制DC系数的改变程度,在保证水印不可见性的同时,提高了水印的鲁棒性。为实现水印的盲检测,采用Gold码序列对水印信息进行了扩频。在检测阶段,充分利用Gold序列良好的相关性恢复出水印。应用所提出算法,把水印信息嵌入到一幅512×512的灰度图像中。实验表明,该算法对常规信号处理攻击和几何攻击具有很强的鲁棒性。     

The relationship between attentional blink and psychological refractory period.

This study examined the relationship between attentional blink (AB) and psychological refractory period (PRP) using a conventional AB procedure combined with a requirement of speeded responses to the second target (T2). Experiments 1 and 2 showed that, as with PRP, memory retrieval of targets is not a necessary condition for the occurrence of AB in terms of accuracy and that AB occurred in the speed data. Experiment 3 further indicated that the PRP-like speed data were not due to the first target serving as a warning signal that triggered preparation of responses to T2. Experiment 4 manipulated T2 stimulus intensity to be normal or low. Results showed an underadditive interaction between stimulus intensity and lag position in the speed data, whereas an overadditive interaction was found in the accuracy data, suggesting 2 sources of interference leading to AB: the single-channel bottleneck and resource-limited visual-processing capacity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)