Analysis of Echoes in Single-Image Random-Dot-Stereograms

Three-dimensional depth information of a surface can be encoded in a two-dimensional image called autostereograms. The encoded surface can be reconstructed from an autostereogram by using the correspondences between pixels in human brains or computer algorithms. However, in some cases, the reconstructed surface is not unique because of echoes. In the presence of echoes, reconstruction of the original surface from the autostereogram cannot be guaranteed since no cue of the original surface is available in autostereograms. In this paper, the causes of echoes are investigated and conditions for echo-free reconstruction are derived. Based on these conditions, autostereogram generation algorithm is revised to guarantee echo-free autostereograms. Besides, the surface reconstruction algorithm is modified such that original surfaces encoded are always reconstructed from echo-free autostereograms.     

高强混凝土新型梁柱节点构造的抗震性能试验研究

针对低-中震害区构件有限延性的要求,提出了2种新型钢筋混凝土梁柱节点的构造形式:在节点区加配斜钢筋,或梁主钢筋在节点区弯起.它们既可满足有限延性的要求,又可避免节点区钢筋密集.通过对4个高强混凝土梁柱节点在低周反复荷载作用的试验表明:2种新型节点均可提高节点延性,将节点的位移延性系数分别从3提高到3.5和4.4;在节点区加配斜钢筋的试件可提高强度15%.因此,对于有限延性要求的节点,是最佳的节点构造形式.     

On multivariate polynomial matrix factorization problems

This paper studies the multivariate polynomial matrix factorization problems which have applications to multidimensional systems theory and signal processing. We first extract an algorithm from Pommaret's proof of the Lin-Bose conjecture. Then we simplify our algorithm, and prove a theorem which gives a sufficient and necessary condition for a multivariate polynomial matrix to have an minor left prime (MLP) factorization. Examples are given to illustrate the effectiveness of this algorithm. Our results hold for any coefficient field and thus have a wide range of applications. This work was supported by grants from the Research Grants Council of Hong Kong (Project CUHK4185/01E) and 973 projects(G1999035802 and 2004CB318004)     

Ge n-MOSFETs on lightly doped substrates with high-/spl kappa/ dielectric and TaN gate

In this letter, we report successful fabrication of germanium n-MOSFETs on lightly doped Ge substrates with a thin HfO/sub 2/ dielectric (equivalent oxide thickness /spl sim/10.8 /spl Aring/) and TaN gate electrode. The highest peak mobility (330 cm/sup 2//V/spl middot/s) and saturated drive current (130 /spl mu/A/sq at V/sub g/--V/sub t/=1.5 V) have been demonstrated for n-channel bulk Ge MOSFETs with an ultrathin dielectric. As compared to Si control devices, 2.5/spl times/ enhancement of peak mobility has been achieved. The poor performance of Ge n-MOSFET devices reported recently and its mechanism have been investigated. Impurity induced structural defects are believed to be responsible for the severe degradation.     

Very-high-speed all-optical code-division multiplexing systems using a 2n prime code

We demonstrate experimental all-optical code-division multiplexing (AO-CDM) systems using 64-ps optical pulses and a 2" prime code of n = 3. A distinguishing feature of this experiment is that the modulation of an ultrashort optical clock stream by electrical data is realized without using any optical intensity modulator at each transmitter. Moreover, only low-cost optical 2 x 2 couplers and fiber delay lines are employed to implement all-serial encoders and decoders for a 2n prime code.     

Scrotal skin ulcer in a patient with a previous tonsillectomy because of natural killer cell lymphoma

The CD56+ lymphomas are a recently characterized high-grade malignancy of putative natural killer cell origin. They are mostly localized to the nasal areas but show a propensity to spread to or recur in the skin. We describe a unique case of CD56+ natural killer lymphoma that recurred in scrotal skin in a patient 8 years after an initial limited resection. Although this case was unusual in showing a prolonged period of apparent remission, it illustrated a characteristic clinicopathologic behavior of this rare tumor.     

Control of reflectance of liquid droplets by means of electrowetting

It has recently been noted that hemispherical structures have useful reflection characteristics. We describe a new application that makes use of these characteristics by controlling the reflectance of a surface composed of an array of hemispherical liquid droplets. In this system the reflectance state is spatially controlled through the use of electrowetting to alter the shape of an array of droplets. This may have an application in the field of electronic image displays.     

Pulsed laser annealing of single-crystal and ion-implanted semiconductors

The dynamic characteristics of both single-crystal and ion-implanted semiconductor layers annealed by a pulsed high-power laser beam is examined analytically for the first time by means of a parametrized perturbation method. The laser-induced lattice temperature rise is explicitly related to the laser beam parameters as well as the semiconductor properties. Specifically, the temperature in the annealed semiconductor is characterized in terms of the ambipolar diffusion length of hot, excess charge carriers, the optical attenuation coefficient of the medium, and the operating laser power, and the threshold pulse energy for surface melting is calculated for the case of silicon devices. It is shown that the pulse energy required for the onset of surface melting is sensitively dependent on the optical absorption coefficient, decreases significantly with increasing pulse intensity, and increases remarkably with increasing diffusion length of excess charge carriers.     

A methodology of determining aggregated importance of engineering characteristics in QFD

Quality function deployment (QFD) is a planning and problem-solving tool that is gaining acceptance for translating customer requirements (CRs) into engineering characteristics (ECs) of a product. Deriving the importance of ECs is a crucial step of applying QFD. However, the inherent fuzziness in QFD presents a special challenge to effectively evaluate the importance of ECs and correlation among them. Furthermore, degree of impact of an engineering characteristic (EC) on the other ECs also reflects the importance of the ECs. In previous studies, those impacts were neglected or simply represented using a linear combination in determining the importance of ECs. To address this issue, in this paper, a new methodology of determining aggregated importance of ECs is presented which involves the consideration of conventional meaning of importance of ECs as well as the impacts of an EC on other ECs. In the proposed methodology, fuzzy relation measures between CRs and ECs as well as fuzzy correlation measures among ECs are determined based on fuzzy expert systems approach. These two types of measures are then used to determine the aggregated importance of ECs. An example of design of a digital camera is used to illustrate the proposed methodology.