A crosstalk model and its application to stereoscopic and autostereoscopic displays

We propose a model to quantify the crosstalk phenomenon for stereoscopic and autostereoscopic displays, separate crosstalk contributed from co‐location image contrast (CIC) and system crosstalk (SCT), introduce gray scale dependency of CIC, modify model for gray scale dependency of SCT in active type 3D displays, and apply the model to derive the 3D luminance and SCT measurement formulas. The model might serve as a basis for the 3D metrology, and the results of this research should be of reference value to hardware makers and inspectors of stereoscopic and autostereoscopic displays.     

Implication of Cognitive Style in Designing Computer‐Based Procedure Interface

Different people have different models of mental perception, which form the bases of human reactions. The design of human‐computer interfaces should consider these differences in the cognitive models of users to achieve maximum benefits. The Myers‐Briggs Type Indicator (MBTI) is an accepted tool for measuring four dimensions of an individual's cognitive model. This research investigated the effects of two interface designs based on the characteristics of the Sensing/iNtuitive (S/N) and Thinking/Feeling (T/F) categories. These interfaces were designed for the visual information displays of computer‐based procedures at a nuclear power plant. Because of the nature of this industry, quicker reaction times are required and fewer mistakes are tolerated. A group of subjects were selected, and the subjects were assigned to either the ST or NT group before the experiment. The results, when compared with earlier statistics for a single design for all users, indicate that reaction times were reduced in some critical situations and the number of mistakes was reduced. © 2011 Wiley Periodicals, Inc.     

An opportunistic resource allocation approach for mixed QoS and non-QoS connections in OFDMA wireless networks

An opportunistic resource allocation approach is proposed to guarantee both fair resource allocation and high system throughput under combinations of QoS and non-QoS connections in OFDMA networks. This approach features dynamic connection classification and packet prioritization based on real-time network conditions and QoS constraints. A classifier is first employed to prioritize QoS connections by observing the channel state of each subscriber station and the utilization of network resources. It performs a finite-horizon Markov decision process with dynamic rules affected by system load. The transmission order of packets is then determined by an opportunistic multiservice scheduler according to the QoS requirements of connections and the output of the classifier. Having the scheduling result, an allocator assigns slots to the scheduled packets, and its output is linked back to the connection classifier through a resource usage observer for all subscriber stations. The sub-channel allocation problem is also solved by cooperation between the slot allocator and the packet scheduler. Results of numerical analysis and NS2 simulation confirm the advantages claimed above. The same conclusion can also be drawn from the comparison with several existing approaches in terms of system throughput, service successful ratio, average spectral efficiency, and system revenue.     

Fabrication of TiN-based three-terminal nano mechanical relays using nanoimprint technology

This paper reports the fabrication of nanoscale mechanical relays using a nanoimprint technology, called contact-transfer and mask-embedded lithography. This cost effective method facilitates the fabrication of nanoscale metallic source electrodes in one easy step. For the design and simulation of relays, we developed a purpose-built system to measure the resonant frequency of TiN nano-structures to determine the mechanical properties of nanoscale thin films. The results presented a Young’s modulus of approximately 600 GPa and residual stress low enough to be disregarded in the proposed process. Finally, we succeeded in fabricating three-terminal nano-relays of various lengths, the operation of which was demonstrated by measuring the I–V curve of each device. Measured pull-in voltages were compared with those of the simulation results.     

基于S3C6410的田间视频监控系统的实现

为实现农田实时监测,设计一种基于ARM11处理器的网络视频监控系统.系统以S3C6410作为网络监控系统的处理芯片,以USB摄像头为视频采集设备,通过有线方式接入互联网.详细阐述了嵌入式操作系统的移植与烧写,内核的剪裁与编译,以及Mjpg-streamer视频服务器软件的编译和移植.测试结果表明,系统在640×480分辨率下可以达到25fps的效果,传输视频稳定、清晰.     

Path-independent line integrals for steady-state,two-dimensional thermoelasticity

Three path-independent line integrals J' _k, M', and L' ₃ are derived for steady-state, two-dimensional thermoelasticity. These integrals are similar to the J _k, M, and L ₃ presented by Knowles and Sternberg [1], but include additional terms of either free expansion displacement vector u _k ^* or temperature and its conjugate harmonic function in their formulation. These new line integrals enable us to avoid the undesirable area integration [3–8] when calculating the strain energy release rate for crack problems. Application of J/ _k, M', and L' ₃ is demonstrated through a sample problem of a constant heat flux disturbed by a finite crack in an infinite plate.

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Résumé On établit les intégrales linéaires J _k, M' et L' ₃ indépendantes du parcours applicables aux problèmes de thermo-élasticité en état stable et suivant deux dimensions. Ces intégrales sont similaires aux intégrales de conservation J _k, M et L ₃ introduites par Knowles et Sternberg, mais comportent des termes supplémentaires prenant en compte dans la formulation le vecteur de déplacement u _k ^* en dilatation libre ou la température et sa fonction complexe .Ces nouvelles intégrales linéaires permettent aux auteurs d'éviter une intégration sur des zones inutiles lors du calcul, dans des problèmes de fissuration, de la vitesse de relaxation de l'énergie de déformation.On démontre l'applicabilité de J' _k, M' et L' ₃ dans un exemple de problème de flux de chaleur constant soumis à une perturbation par une fissure finie dans une plaque infinie.

     

配电网信息物理系统恶性数据链检测与识别

由于恶性数据链干扰配电网的信息输出和转发控制能力,因此需检测配电网信息物理系统中的恶性数据链。根据恶性数据时间序列节点融合恶性数据链能量特征,并构建其高维映射结构,通过高维映射结构拟合恶性数据,获取恶性数据链。采用谱特征提取方法建立恶性数据链谱特征量模型,实现配电网信息物理系统恶性数据链的分类检测。仿真结果表明,采用该方法进行配电网信息物理系统恶性数据链检测的自适应性较好,分辨能力较强,在配电网信息物理系统恶性数据链检测识别中具有很好的应用价值。     

Observation of phosphorus segregation onto the free surface of an amorphous Fe44Ni36P14B6 alloy

Phosphorus segregation to the free surface of an amorphous Fe₄₄Ni₃₆P₁₄B₆ alloy during annealing in the temperature range 180 to 300° C has been studied by Auger electron spectroscopy. The phosphorus concentration increased with annealing temperature with an abrupt change appearing at about 250° C. At 276° C the phosphorus Peak Height Ratio on the surface was three times as high as that of a sputtered surface. A step-heating scheme has been employed to observe the surface segregation of phosphorus in the temperature range 25 to 290° C. On heating, the segregation behaviour can be correlated with a degradation in toughness properties. It is concluded that the segregation of phosphorus onto the free surface of this amorphous alloy is an indication of some local atomic migration processes, for example clustering, occurring inside the bulk.     

Effect of microscopic parameters on EBSD spatial resolution

In this study, a quantitative approach is proposed to understand the effect of the accelerating voltage and the probe current on the physical resolution of EBSD. The accelerating voltage was varied from 5 to 30kV and probe currents of 1, 10, and 40nA were selected. The lateral, longitudinal, and depth resolutions at 10kV and 1nA were 34.5, 44.7, and 46nm for copper, respectively. When the accelerating voltage was in the range of 5-20kV, the ratio of the longitudinal to the lateral resolution was below the theoretical ratio of 2.9. Considering the channeling effect, the best physical depth resolution of 38nm was achieved at 5kV and 10nA. The physical depth resolution in an EBSD measurement is much larger due to the channel effect than that obtained without considering this effect.