With the availability of affordable new desktop fabrication techniques such as 3D printing and laser cutting, physical models are used increasingly often during the architectural and industrial design cycle. Models can easily be annotated to capture comments, edits and other forms of feedback. Unfortunately, these annotations remain in the physical world and cannot be easily transferred back to the digital world. Here we present a simple solution to this problem based on a tracking pattern printed on the surface of each model. Our solution is inexpensive, requires no tracking infrastructure or per object calibration, and can be used in the field without a computer nearby. It lets users not only capture annotations, but also edit the model using a simple yet versatile command system. Once captured, annotations and edits are merged into the original CAD models. There they can be easily edited or further refined. We present the design of a SolidWorks plug-in implementing this concept, and report initial feedback from potential users using our prototype. We also present how this prototype could be extended seamlessly to a fully functional system using current 3D printing technology.

Taking three residential areas of different income levels in Kaifeng City, Henan Province in 2009 as a case, this study analyzed the ecological footprint of Kaifeng city using the theory and methods of ecological footprint and questionnaire survey. According to the questionnaire survey of three residential areas of Banqiao, Kangping and Longcheng xiangxieli garden, the ecological footprint of consumption of biological resources and energy consumption are calculated in these areas. The conclusions are made that the higher the income consumption level of residents, the greater the ecological footprint, and lower income residents consumption level, the smaller ecological footprint.

As more and more tools are developed for meeting support tasks, properly using these tools to get expected results becomes too complicated for many meeting participants. To address this problem, we propose POEMS (Paper Offered Environment Management Service) that allows meeting participants to control services in a meeting environment through a digital pen and an environment photo on digital paper. Unlike state-of-the-art device control interfaces that require interaction with text commands, buttons, or other artificial symbols, our photo enabled service access is more intuitive. Compared with PC and PDA supported control, this new approach is more flexible and cheap. With this system, a meeting participant can initiate a whiteboard on a selected public display by tapping the display image in the photo, or print out a display by drawing a line from the display image to a printer image in the photo. The user can also control video or other active applications on a display by drawing a link between a printed controller and the image of the display. This paper presents the system architecture, implementation tradeoffs, and various meeting control scenarios.

This paper introduces several PID control algorithms and their discretization expression. Compare the performance of positional PID algorithm with incremental PID algorithm, integration separate PID algorithm, incomplete differential PID algorithm and PID algorithm with dead zone. The experiment results show that different digital PID control algorithm could achieve different using.

This paper proposes extracting black line with small-scale method in the self-tracing car system based on OV6620 as the video sensor unit. Describe the hardware design of OV6620 and other two kinds of image signal extracting methods, which are to extract black line from left to right, and extract black line from middle to both sides. The testing shows that extracting black line with small-scale method has good stability, accuracy, and anti-interference.