A semantic modeling approach for image retrieval by content

We introduce a semantic data model to capture the hierarchical, spatial, temporal, and evolutionary semantics of images in pictorial databases. This model mimics the user's conceptual view of the image content, providing the framework and guidelines for preprocessing to extract image features. Based on the model constructs, a spatial evolutionary query language (SEQL), which provides direct image object manipulation capabilities, is presented. With semantic information captured in the model, spatial evolutionary queries are answered efficiently. Using an object-oriented platform, a prototype medical-image management system was implemented at UCLA to demonstrate the feasibility of the proposed approach.     

调研：更加贴近顾客

如果企业能更深入地了解他们的终端顾客，那么他们将获得真正的收益。     

一种高动态范围图像可视化算法*

提出的自适应HDR图像可视化算法中,输入图像被分解为基本层和细节层.该算法将整体明暗效果的显示看做整体问题,对表示亮度的基本层采用基于整体统计信息的直方图调整算法处理;可视细节信息的保持作为局部问题,算法采用自适应细节增强算法处理细节层.通过定义映射图对细节增强后的图像进行最终映射,将两方面结合起来得到最终结果.实验结果表明,该算法能对HDR图像进行较高视觉质量的显示.     

Fabrication and characteristics of novel microelectronic structures fabricated by plasma-based techniques

A number of novel microelectronic structures have recently been produced using plasma-based techniques such as plasma immersion ion implantation (PIII) and this paper describes the recent progress made in this area in our laboratory. Conventional silicon-on-insulator (SOI) substrates utilizing a buried silicon dioxide layer suffer from self-heating effects as device dimensions shrink to the deep-submicrometer regime. Novel SOI structures using dielectric materials with higher thermal conductance such as aluminum nitride and diamond-like carbon have been produced. In the area of high-k (dielectric constant) thin films, plasma nitridation conducted on materials such as zirconium dioxide improves the recrystallization and interfacial properties. In the conventional Smart-Cut™ or ion-cut technique, high-energy hydrogen implantation is performed to effect layer transfer. Low-energy (several hundred eVs) plasma hydrogenation has recently been conducted in conjunction with damage engineering to produce wafer splitting for layer transfer. This new process allows more flexible control of the depth of hydrogen accumulation and the location of layer cleavage.     

Characterizing the Nash equilibria of a three-player Bayesian quantum game

Quantum games with incomplete information can be studied within a Bayesian framework. We consider a version of prisoner’s dilemma (PD) in this framework with three players and characterize the Nash equilibria. A variation of the standard PD game is set up with two types of the second prisoner and the first prisoner plays with them with probability p and \(1-p\), respectively. The Bayesian nature of the game manifests in the uncertainty that the first prisoner faces about his opponent’s type which is encoded either in a classical probability or in the amplitudes of a wave function. Here, we consider scenarios with asymmetric payoffs between the first and second prisoner for different values of the probability, p, and the entanglement. Our results indicate a class of Nash equilibria (NE) with rich structures, characterized by a phase relationship on the strategies of the players. The rich structure can be exploited by the referee to set up rules of the game to push the players toward a specific class of NE. These results provide a deeper insight into the quantum advantages of Bayesian games over their classical counterpart.     

以跨学科架构分析与认识城市规划设计空间

在城市设计过程中 ,需要首先对设计的对象进行形象化的分析和研究 ,从而形成关于城市环境空间设计的规定性、指导性导则 .为此 ,在城市规划设计中不同领域的人基于各自的学科领域知识及应用背景以不同的角度去审视分析城市空间 ,从而提供城市空间不同层次不同角度的参考信息 .要形成城市设计空间全面、形象、准确、具体的认识 ,以利于城市设计从整体上去把握城市空间 ,这就需要进行多种信息资料整合 ,首先面临的就是从跨学科的角度去认识和把握城市空间 ,将原有信息在跨学科的领域分析中得到更大的发挥 .通过城市可视视觉景观分析、城市光环境分析及城市风环境分析 ,对在不同层面上所提供的城市环境空间信息进行分析 ,从而探讨基于多学科的信息整合、信息再生、信息处理与分析所面临的机遇与挑战 .     

A Demonstration of High-Throughput Electrophoresis

Automating electrophoresis significantly reduces the time required for loading a large number of samples, increases the speed of electrophoresis analysis, and maximizes the resolution power (clear separation of fragments) of this technique. In addition, automation increases the precision of electrophoresis analysis. Here we demonstrate an automated, high-throughput method of loading 96 samples simultaneously onto an electrophoresis gel, using the Apogent Discoveries Tango™ system and the Invitrogen™ E-Gel® 96 system.     

Formal verification of conflict detection algorithms

Safety assessment of new air traffic management systems is a main issue for civil aviation authorities. Standard techniques such as testing and simulation have serious limitations in new systems that are significantly more autonomous than the older ones. In this paper, we present an innovative approach for establishing the correctness of conflict detection systems. Fundamental to our approach is the concept of trajectory, and how we represent a continuous physical trajectory by a continuous path in the x-y plane constrained by physical laws and operational requirements. From the model of trajectories, we extract, and formally prove, high-level properties that can serve as a framework to analyze conflict scenarios. We use the AILS (Airborne Information for Lateral Spacing) alerting algorithm as a case study of our approach. Published online: 19 November 2002     

Static Output Feedback Stabilization: An ILMI Approach

In this note, the static output feedback stabilization problem is addressed using the linear matrix inequality technique. A necessary and sufficient condition for static output feedback stabilizability for linear time-invariant systems is derived in the form of a matrix inequality. The extension of the result to H_∞ control is studied. An iterative LMI (ILMI) algorithm is proposed to compute the feedback gain. Numerical examples are employed to demonstrate the effectiveness and the convergence of the algorithm.     

DVR的不平衡浪涌和过电压控制

讨论无串联隔离变压器的动态电压调节器(DVR)在不平衡电压浪涌或过电压情况下的补偿问题。使用不可控整流为直流侧电容充电的DVR,在补偿时只允许其向系统注入有功功率。在浪涌或过电压发生时,DVR可能发生从系统吸收有功功率的情况,如果仍然使用传统的同相或相位不变电压注入控制方法,将导致直流侧电容电压迅速升高,可能损坏开关器件或储能单元。利用最小能量补偿控制方法也不能完全解决该问题,因而提出一种单向功率流动控制算法。该算法通过将参考电压旋转一定的角度,使DVR无论在3相平衡与不平衡浪涌或过电压的情况下,都不从配电系统吸收有功,同时能将负荷电压补偿为3相平衡且达到正弦的额定值。该算法加入对DVR最大补偿极限的考虑,以确保注入补偿电压不超过DVR的补偿极限。文中对直流母线电压不可避免的泵升问题提出了缓冲控制策略。最后,仿真结果验证了算法的正确性及有效性。