多视点平行拼图

提出了一种新的多视点拼图,称之为平行拼图,平行拼图不仅可以应用到基于图像的绘制技术中,而且可以广泛地运用于基于图像的三维重建。该文设计了从真实照片中得到高分辨率平行拼图的算法,建立了从平行拼图得到高精度绘制输出的数学模型,讨论了用照片建立平行拼图的精度上限,并且给出了良好的实验结果。     

基于物理模型的窗帘运动实时动画

提出了一个基于物理的窗帘实时动画模型.该模型不仅大大地减少了绘制的时间,而且保证了画面的视觉效果.通过把描述非刚体运动的半刚性杆相互连接来得到窗帘的模型.在该模型中,首先在经线和纬线的方向上分别进行处理,然后再把它们组合起来,从而得到窗帘的模型.     

Ontology-driven document enrichment: principles, tools and applications

In this paper, we present an approach to document enrichment, which consists of developing and integrating formal knowledge models with archives of documents, to provide intelligent knowledge retrieval and (possibly) additional knowledge-intensive services, beyond what is currently available using “standard” information retrieval and search facilities. Our approach is ontology-driven, in the sense that the construction of the knowledge model is carried out in a top-down fashion, by populating a given ontology, rather than in a bottom-up fashion, by annotating a particular document. In this paper, we give an overview of the approach and we examine the various types of issues (e.g. modelling, organizational and user interface issues) which need to be tackled to effectively deploy our approach in the workplace. In addition, we also discuss a number of technologies we have developed to support ontology-driven document enrichment and we illustrate our ideas in the domains of electronic news publishing, scholarly discourse and medical guidelines.     

基于协议序列的车辆自组织网络信道接入控制算法

 针对如何提高车辆自组织网络无线信道资源利用率问题,提出了一种分布式车辆间通信信道接入控制算法,该算法具体表示为利用中国余数定理设计一种用户保障协议序列,车辆节点(亦称用户)依据该协议序列决定其对通信信道的接入,无需基站或中心节点的协调,所设计的协议序列确保每个车辆节点在一个序列周期内至少成功发送一次数据.仿真结果表明,采用本文提出的协议序列控制算法比无反馈时隙ALOHA接入控制算法具有更小的传输时延,能够满足车辆自组织网络通信实时性的要求.     

Averaging analysis of model reference adaptive identifier using least-square algorithm

Model reference adaptive identifiers (MRAI) are designed with the assumption that the reference model M¯ is strict positive real (SPR). The properties of MRAI with gradient algorithms have been well studied. In this paper we analyse the MRAI with least-square (LS) algorithms. It is found that a sufficient condition for the system stability is that M¯ ? ½ is SPR. A generic averaging technique is developed for the adaptive systems with periodic inputs. Then averaged systems of MRAI with the LS algorithm are formed. Simulation studies illustrate the properties of MRAI and verify the validity of the averaging approximation.     

Optical fiber-based devices and applications

Optical fiber technology has undergone tremendous growth and development over the last 40 years. Optical fibers constitute an information super highway and are vital in enabling the proliferating use of the Internet. Optical fiber is also an enabling technology which can find applications in sensing, imaging, biomedical, machining, etc. There have been a few milestones in the advancement of optical fiber technology. Firstly, the invention and development of the laser some 50 years ago made optical communications possible. Secondly, the fabrication of low-loss optical fibers has been a key element to the success of optical communication.     

用于动态序列合成的基于核密度估计的隐马尔科夫模型

提出了一种用于动态序列合成的统计模型－基于核密度估计的隐马尔可夫模型，给定一个输入动态序列，该模型可以自动产生被控的输出动态序列，文中提出的模型是一种以非参数化概率密度估计作为观测模型的隐马尔可夫模型，该模型对输入和受控输出序列的联合概率分布进行建模，并利用基于核函数的概率密度估计来学习联合概率分布的细节信息，文中详细地讨论了该模型的学习和合成算法，并利用该模型实现了一个虚拟指挥系统，即给定一段音乐，系统可以自动生成相关的乐队指挥动作，该文利用该系统对不同风格和节拍的音乐做了实验，实验结果验证了算法的有效性。     

Tunable fiber Bragg grating filters realized by chirp rate tuning with a cantilever beam

An efficient scheme to change the chirp rate of a fiber Bragg grating (FBG) has been developed based on a specially-designed cantilever beam with the beam-bending method. It allows, to date, the largest tuning range of 36 nm in reflection bandwidth of a chirped-FBG (CFBG) while keeping the center wavelength nearly fixed during the tuning process. Using this method, bandwidth-tunable fiber grating filters with tunable chromatic dispersion or differential group delay have been demonstrated. Channel spacing-tunable multi-wavelength filters based on both sampled- and superimposed-CFBGs have also been realized. Moreover, tuning of the bandwidth and channel spacing is continuous with this scheme that makes the achieved devices more flexible.     

从同心拼图中恢复深度信息

同心拼图（Concentric Mosaics,CM)是一种重要的基于图像的绘制方法。如果利用深度信息则可以进一步提高绘制质量并减少数据量。作者发现在CM序列中也存在着近拟的极线平面图像（Epipolar Plane Image,EPI）,而且像点在EPI图像上的轨迹斜率和物点的深度呈近似线性关系。基于此发现,该文提出了一种从CM序列中自动动恢复深度信息的方法。这个方法首先利用EPI图像的频谱分析对场景的深度分布范围做出估计,然后根据全光采样的原理在EPI的斜率空间均匀的分割投票箱,并对给定窗口内频谱能量进行投票,以求得能量的最大方向,从而获得这个窗口所对应的深度,最后组合成CM的场景深度图,实验结果证实了上述方法的有效性。     

Sea level change under IPCC-A2 scenario in Bohai,Yellow, and East China Seas

Because of the environmental and socioeconomic impacts of anthropogenic sea level rise （SLR）, it is very important to understand the processes leading to past and present SLRs towards more reliable future SLR projections. A regional ocean general circulation model （ROGCM）, with a grid refinement in the Bohai, Yellow, and East China Seas （BYECSs）, was set up to project SLR induced by the ocean dynamic change in the 21st century. The model does not consider the contributions from ice sheets and glacier melting. Data of all forcing terms required in the model came from the simulation of the Community Climate System Model version 3.0 （CCSM3） under the International Panel on Climate Change （IPCC）-A2 scenario. Simulation results show that at the end of the 21st century, the sea level in the BYECSs will rise about 0.12 to 0.20 m. The SLR in the BYECSs during the 21st century is mainly caused by the ocean mass redistribution due to the ocean dynamic change of the Pacific Ocean, which means that water in the Pacific Ocean tends to move to the continental shelves of the BYECSs, although the local steric sea level change is another factor.