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排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
Eye-tracking technology offers a natural and immediate way of communicating human intentions to a computer. Eye movements
reflect interests and may be analysed to drive computer functionality in games, image and video search, and other visual tasks.
This paper examines current eye tracking technologies and their applications. Experiments are described that show that target
images can be identified more rapidly by eye tracking than using a mouse interface. Further results show that an eye-tracking
technology provides an efficient interface for locating images in a large database. Finally the paper speculates about how
the technology may enter the mass market as costs decrease. 相似文献
992.
Recently, progress has been made in the Generalized Multi-Protocol Label Switching (GMPLS) and Automatic Switched Optical
Networks (ASON) standardizations. These technologies realize construction of large-scaled optical networks, interconnections
among single-domain Wavelength Division Multiplexing (WDM) networks, and direct communication over multi-domain WDM networks.
Meanwhile, it is known that the topology of the Internet exhibits the power-law attribute. Since the topology of the Internet,
which is constructed by interconnecting ASs, exhibits the power-law, there is a possibility that large-scale WDM networks,
which are constructed by interconnecting WDM networks, will also exhibit the power-law attribute. One of the structural properties
of a topology that adheres to the power-law is that most nodes have just a few links, although some have a tremendous number
of them. Another property is that the average distance between nodes is smaller than in a mesh-like network. A natural question
is how such a structural property performs in WDM networks. In this paper, we first investigate the property of the power-law
attribute of physical topologies for WDM networks. We compare the performance of WDM networks with mesh-like and power-law
topologies, and show that links connected to high-degree nodes are bottlenecks in power-law topologies. To relax this, we
introduce a concept of virtual fiber, which consists of two or more fibers, and propose its configuration method to utilize
wavelength resources more effectively. We compare performances of power-law networks with and without our method by computer
simulations. The results show that our method reduces the blocking probabilities by more than one order of magnitude. 相似文献
993.
S. Bidault L. Viau O. Maury S. Brasselet J. Zyss E. Ishow K. Nakatani H. LeBozec 《Advanced functional materials》2006,16(17):2252-2262
The bottom‐up design of polymer films exhibiting quadratic nonlinear optical properties that can be tuned optically and chemically is described. The polymer matrices are doped with metal‐containing chromophores built around a ZnII core and photoisomerizable ligands with two different geometries. These molecules possess specifically designed photophysical and nonlinear optical properties to be used towards all‐optical poling, an interference process between one‐ and two‐photon excitations that locally induces macroscopic second‐order effects in polymer films. It is shown that grafting the molecules onto the polymer chains improves the stability of the macroscopic photoinduced nonlinearity in the films. 相似文献
994.
Tests of a prototype model of TUK-84 and the corresponding experimental procedures used at the test center of the All-Russia
Research Institute of Technical Physics are described. The results are presented, and it is shown that the prototype withstood
the tests.
__________
Translated from Atomnaya énergiya, Vol. 100, No. 6, pp. 441–445, June, 2006. 相似文献
995.
996.
N. N. Novikov O. V. Korovin Yu. V. Astapenko D. V. Overchenko 《Measurement Techniques》1996,39(6):607-612
This article considers the influence of changes in monitorability indicators on the operational characteristics of communications
equipment. For indicators of monitorability we take the depth of defect search, failure localizability, overhead, and others.
Among the operational characteristics, those considered include time to repair, probability of undetected failure, probability
of failure-free operation, etc. The results obtained make it possible to estimate, during the design phase, the influence
of changes in monitorability factors on the operational characteristics of equipment and to make selections that meet given
requirements.
Translated from Izmeritel'naya Tekhnika, No. 6, pp. 23–26, June, 1996. 相似文献
997.
998.
J Holst B Lindblad D Bergqvist O Nordfang PB Ostergaard JG Petersen G Nielsen U Hedner 《Canadian Metallurgical Quarterly》1994,71(2):214-219
The aim was to investigate whether a truncated recombinant Tissue Factor Pathway Inhibitor (TFPI1-161), which lacked the third Kunitz-type domain and the basic c-terminal region, had an antithrombotic effect comparable to LMWH in a randomised double-dummy study. The experimental thrombosis was induced in jugular veins, in a total of 40 rabbits by a combination of destruction of the endothelium and restricted blood flow. Group 1: placebo, gr 2: LMWH 60 anti-FXa IU/kg, gr 3-5: 0.1, 1.0 and 10.0 mg/kg TFPI1-161. TFPI1-161 reduced the thrombus weights in all treated groups, significantly in doses of 1.0 and 10.0 mg/kg compared to placebo. The frequency of thrombosis and occlusive thrombosis were also significantly reduced in those doses. The antithrombotic properties of TFPI1-161 (1.0-10.0 mg/kg) measured as thrombus weight, frequency of thrombosis and frequency of occlusive thrombosis was equivalent to the anti-thrombotic properties of LMWH. In the anti-FXa, APTT and PT-assays TFPI1-161 displayed a dose dependent increase of activity. Recombinant-TFPI1-161 did not influence the anti-FIIa-assay. No haemorrhagic side effects were noted. 相似文献
999.
三参量速度分析的迭代算法 总被引:3,自引:3,他引:0
徐常练 《石油地球物理勘探》1993,28(5):614-622
采用预求倾角法进行三参量速度分析时,首先要确定地下界面的倾向和倾角。若没有准确速度,就求不准倾向和倾角,因此无法一次求得准确的结果。若采用迭代算法,则可以使三参量逐渐向精确值逼近。在地层倾角小于45^0的情况下,迭代是收敛的。在有噪音的情况下,噪音会使叠加道集上同相轴的时间发生变化,从而影响倾向的确定,因此在迭代的每一步,都必须估算倾向。理论实际资料的试算表明,采用迭代方法求取地下界面参数是切实可 相似文献
1000.