笔记采集工具的设计与开发

移动计算是当今主流的计算模式之一，以MID、UMPC、Tablet PC、PDA为代表的移动设备为移动计算的实现提供了可行性。在办公软件领域，随着用户需求的多样化发展，办公软件的非结构化、自由化输入是未来发展的趋势，以鼠标、键盘为主的传统办公软件已不能适应移动设备的需求。 思维是人接受信息、存贮信息、加工信息以及输出信息的活动过程。知识工作者是思维最为活跃的人群，是开发和使用知识的人。笔记是思维重要的呈现方式，笔记采集是知识工作者主要的活动之一。笔记采集正朝着个性化、智能化的方向发展，传统的办公软件已不能适应笔记采集的需求，以笔记采集为主要内容的移动办公软件将是办公软件发展的方向之一。 为适应笔记采集的移动性、自由性特点，本文设计和开发了面向知识工作者的笔记采集工具。本文的主要工作如下： 1． 笔记采集工具的需求分析 通过分析知识工作者的代表人群（老师和学生）在特定场景下的手写材料，总结得到笔记采集工具的功能需求。笔记采集工具需要支持笔迹的输入、笔迹结构的高级理解（如概念图理解等）以及一些特定领域下的功能（如动态几何作图等）。 2． 笔记采集工具的系统设计 依据PIBG界面范式，设计了笔记采集工具。具体地，通过剖析笔迹信息处理的层次关系，设计出笔迹处理解析机制；按照功能将系统划分为四个模块：笔迹采集、笔迹编辑、笔迹理解和笔迹管理；设计出包含交互层、任务层、算法层和数据层的软件体系结构。 3． 笔记采集工具的主要算法和特色功能 笔记采集工具的个性化和自由化需要各种高级功能（如概念图理解、动态几何）的支持。工具中采用的算法包括$1模板匹配算法、数学公式理解、概念图结构理解、笔迹搜索以及几何约束求解相关的算法。工具设计了一套笔手势，并为手势交互提供了有效的可视化反馈。 4． 笔记采集工具的实现与应用实例 实现了笔记采集原型工具，并给出一个学生使用该工具进行学习的实例。该工具的主要功能包括笔手势交互、动态几何、手写数学公式输入、概念图结构化编辑、笔迹搜索等。

A Note On The Numerical Simulations Of Flow Past A Wavy Square-Section Cylinder

The flow past a square-section cylinder with a geometric disturbance is investigated by numerical simulations. The extra terms, due to the introduction of mapping transformation simulating the effect of disturbance into the transformed Navier-Stokes equations, are correctly derived, and the incorrect ones in the previous literature are pointed out and analyzed. Furthermore, the relationship between the vorticity, especially on the cylinder surface, and the disturbance is derived and explained theoretically. The computations are performed at two Reynolds numbers of 100 and 180 and three amplitudes of waviness of 0.006, 0.025 and 0.167 with another aim to explore the effects of different Reynolds numbers and disturbance on the vortex dynamics in the wake and forces on the body. Numerical results have shown that, at the mild waviness of 0.025, the Karman vortex shedding is suppressed completely for Re = 100, while the forced vortex dislocation is appeared in the near wake at the Reynolds number of 180. The drag reduction is up to 21.6% at Re = 100 and 25.7% at Re = 180 for the high waviness of 0.167 compared with the non-wavy cylinder. The lift and the Strouhal number varied with different Reynolds numbers and the wave steepness are also obtained.

A note on the heat-transfer to nonspherical particles from plasma

Heat transfer from plasma to a nonspherical partical in the free-molecular regime is studied in the present paper under thin plasma sheath condition. Analytical expressions for the floating potential charge and heat fluxes of an ellipsoid particle of revolution are derived and curves are given for key parameters for arbitrary plasma flow direction. On the basis of these results, an equivalent sphere with the same surface area as the nonspherical particle is suggested to be used for calculating the total heat flux of nonspherical particle in engineering application with acceptable accuracy. Furthermore, the effects of particle rotation, which occurs in most aerosol systems, on the heat transfer are also discussed.

Note on the instability of capillary jet with thermocapillarity

In this paper, we examine a new basic state of long axisymmetric liquid zone, subjected to axial temperature gradients which induce steady viscous flow driven by thermocapillarity. Axial velocity 1/4S-1/2R(B) of liquid zone connects pulling velocity of single crystal. The stability of liquid zone with pulling velocity 1/4S-1/2R(B) to small axisymmetric disturbance is examined The eigenvalue problems on the stability are derived. A special case (eta = 0) is discussed.

A note on fracture toughnesses of unidirectional composites

presented in a general form where more reasonable relations for the two-phase

Bunga rus bunga roides , A Record New to China ( Xizang AR) with a Note on Trimeresurus tibeta nus( Plate Ⅵ, lower)

1998 年在西藏墨脱县海拔1000 m 左右地方采到成年雌性环蛇1 号, 系我国新纪录。该蛇全长/ 尾长(mm) 1095/ 112 (尾尖断) 。通身背面黑褐色, 后3/ 4 有由背鳞白色点斑缀成的窄横纹约40 个; 腹面浅黑 色, 每隔3 或4 枚腹鳞有不规则的黄白色横斑。尾背有少数不完整的白色纹, 但尾腹面有7 条很明显的横斑。头 部斑纹与M. Smith (1943 : 410) 描述一致, 可能由于蛇龄较老而不清晰。背鳞通身15 行, 脊鳞略扩大; 腹鳞 233 , 尾下鳞35 (略低于文献记载的44～51 , 可能与尾尖断有关) , 除前端第三、四两枚成单外, 其余均成对。 没有颊鳞; 眶前鳞1 , 眶后鳞2 ; 颞鳞1 + 2 ; 上唇鳞7 (22223 式) ; 下唇鳞7 , 第一对在颏鳞后彼此相接, 前4 对 接前颔片; 前颔片大于后颔片, 后者后半介一小鳞。检查一侧, 除前沟牙及其预备牙外, 没有发现其他上颌齿。

Note: A time-resolved Kerr rotation system with a rotatable in-plane magnetic field

Submitted by 阎军 (yanj@red.semi.ac.cn) on 2010-12-05T05:05:17Z No. of bitstreams: 1 Note：A time-resolved Kerr rotation system with a rotatable in-plane magnetic field.pdf: 620425 bytes, checksum: 354584f39f341db1d35ee96d2b0fe14e (MD5)