Dynamic prototypicality effects in visual search.

In recent studies, researchers have discovered a larger neural activation for stimuli that are more extreme exemplars of their stimulus class, compared with stimuli that are more prototypical. This has been shown for faces as well as for familiar and novel shape classes. We used a visual search task to look for a behavioral correlate of these findings regarding both simple geometrical shapes and more complex, novel shape classes. The latter stimulus set enabled us to control for the physical properties of the shapes, establishing that the effects are solely due to the positions of the particular stimuli in a particular shape space (i.e., more extreme versus more central in shape space) and not to specific shape features. The results indicate that finding an atypical instance of a shape class among more prototypical ones is easier and faster than the other way around. The prototypical status of a shape in our experiment could change very quickly, that is, within minutes, depending on the subset of shapes that was shown to the participants. Manipulating the degree of familiarity toward the shapes by selectively increasing familiarity for the extreme shapes did not influence our results. In general, we show that the prototypical status of a stimulus in visual search is a highly dynamic property, depending on the distribution of stimuli within a shape space but not on familiarity with the prototype. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

左挑臂盖梁的分析及计算

通过大型有限元程序Midas civil及平面杆件程序桥梁博士分别计算了左挑臂盖梁,并对结果进行了比较,得出了一些有益的结论。     

Active contours: Generalization of the snake mode

Abstract— Segmentation is one of the fundamental issues in the field of image processing and computer vision. Various approaches include differentiating an object in the image as a final goal or for further processing (medical diagnosis, surveillance, 3‐D reconstruction and more). Snakes, a model proposed by Kass, Witkin, and Terzopoulos in 1987, provides an efficient method for segmenting an object through the minimization of its energy. The advantage of snakes is in its ability to use high‐level data given by the algorithm operator, as opposed to other methods such as the Laplace technique. The snakes model inherently imposes strong constraints on a given image in order to successfully segment an object. In this paper, the use of adjustment methods is described, which allow us to generalize the snake model to a wider range of applications. Through the use of pre‐processing techniques, the model's constraints were softened. The main theoretical model and its use in facing a real life image is presented.     

切割类组合体教学方法的思考

组合体作为《机械制图》课程中的重点和难点章节，在本课程教学中起到了承上启下的作用。对于形状不很规则或轮廓线投影相重合的切割类组合体，如何正确灵活地使用线面分析法来读图，解决课程中的难点，在教学方法上值得思考。     

Real speed of data transfer and the signal-to-noise ratio in a wireless net for connection with mobile objects

The paper presents experimental results of evaluation of the data transfer speed between a mobile object and base stations of a wireless 802.11.g standard network. Estimates are produced for different velocities of object motion. At the same time, measurement was carried out on the signal-to-noise ratio in a channel. A functional relation has been established between the real data transfer speed and the signal-to-noise ratio in the channel of the wireless net connected to a mobile object.     

Dopplerlet变换推广及其在主动声纳处理中的应用

针对水下高速运动目标的主动探测问题,引入了Dopplerlet变换。根据运动目标回波的特点提出了主动Dopplerlet原子,并分析了基于主动Dopplerlet变换的自适应匹配塔形分解算法,克服了Dopplerlet变换在被动信号处理中声源频率变化引起误差增大和时间窗宽度选取困难的问题。最后将算法应用于高斯白噪声和高斯色噪声背景中运动目标的检测和速度距离的估计,取得了较好的结果。     

Wireless smart camera network for real-time human 3D pose reconstruction

A multiple-camera system for 3D pose reconstruction is presented. First, body parts of the user are detected. Each camera has a single-instruction multiple-data (SIMD) processor used to perform this heavy-load image processing task. The detected hand and head candidate positions are then transmitted wirelessly from each camera to a central processor using a low-power ZigBee network. Finally, the 3D pose reconstruction is performed at the central processor by combining the data in a probabilistic manner.     

Progress under bounded fairness

Summary. Progress is investigated for a shared-memory distributed system with a weak form of fault tolerance that allows processes to stop and restart functioning without notification. The concept of bounded fairness is introduced to formalize bounded delay under the assumption that each family of related processes continuously contains at least one active member. This is a generalization of wait-freedom, and also of a finitary form of weak fairness. Several useful proof rules are stated and proved. In a system with bounded fairness, a wait-free process can be constructed by forming a new process in which processes from the various families are scheduled in a round robin way. The theory is applied to prove progress within bounded delay for a linearizing concurrent data-object in shared memory. The safety properties of this algorithm have been treated elsewhere. Received: April 1998 / Accepted: March 1999     

化工装置扩建改造的目标与瓶颈分析

对化工装置扩建改造的目标与瓶颈进行了分析 ,阐述了目标与瓶颈在扩建改造过程中的相辅相成关系。给出了制定目标和发现瓶颈的一般原则 ,认为发现并去除瓶颈的顺序应该是先考虑信息瓶颈 ,然后考虑强度瓶颈 ,最后再考虑容积瓶颈。结合实例给出了目标与瓶颈分析在扩建改造中的应用。     

Development of beliefs about the origins and controllability of dreams.

In three studies the authors investigated the development of beliefs about dreaming. Study 1 assessed 3 to 5-year-old children's beliefs about the origins and controllability of dreams. Results revealed significant changes in children's beliefs about the roles of behavioral experiences and mental processes in the generation of dream content. Results also revealed that young children consider both dreams and imagination to be highly controllable. In Study 2, preschool-age children, elementary school-age children, and adults received either imagination or dream stories and were questioned about controllability. In Study 3, emotional valence of the dream content was varied. Results of Studies 2 and 3 revealed significant development in beliefs that dreams are not subject to conscious control. Beliefs in controllability were higher among females. Study 3 showed that the emotional content of a dream affects these claims. (PsycINFO Database Record (c) 2010 APA, all rights reserved)