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121.
The purpose of remote sensing images fusion is to produce a fused image that contains more clear, accurate and comprehensive
information than any single image. A novel fusion method is proposed in this paper based on nonsubsampled contourlet transform
(NSCT) and region segmentation. Firstly, the multispectral image is transformed to intensity-hue-saturation (IHS) system.
Secondly, the panchromatic image and the component intensity of the multispectral image are decomposed by NSCT. Then the NSCT
coefficients of high and low frequency subbands are fused by different rules, respectively. For the high frequency subbands,
the fusion rules are also unalike in the smooth and edge regions. The two regions are segregated in the panchromatic image,
and the segmentation is based on particle swarm optimization. Finally, the fusion image can be obtained by performing inverse
NSCT and inverse IHS transform. The experimental results are evaluated by both subjective and objective criteria. It is shown
that the proposed method can obtain superior results to others. 相似文献
122.
For the applied limitation of the existing threshold decryption schemes based on the (t, n) structure, an identity-based threshold decryption scheme which can be applied on the access structure is proposed through
designing a special distribution algorithm of the private key shares. The generation and distribution of private key shares,
the encryption, the decryption and the combination are introduced in detail. The validity and security of the scheme are proved
and analyzed. Comparisons with the existing schemes show that the proposed scheme is more flexible. 相似文献
123.
Cluster tools have advantages of shorter cycle times, faster process development, and better yield for less contamination.
The sequence of dual-arm cluster tools is a complex logistics process during the semiconductor production. Efficient use of
cluster tools is naturally very significant to competitive fab operations. Generating an optimized sequence in a computationally
efficient manner and assessing the quality of the requirements to improve the fab production are the key factors for semiconductor
manufacturing productivity. The Petri net modeling is introduced to minimize the makespan of the process for the three different
logical modes and select a better mode after comparing the makespan among the three logical modes. The tool sequence optimization
problem is formulated as optimization firing transition sequences based on the Petri net and then the formulation is converted
to be linearly solved by the branch-and-cut method in the standard commercial solver CPLEX. Special methods for the linear
conversion are highlighted. Due to the limited calculation time requirement for the real production and the large scale of
the problem, special methods for the efficiency tuning are applied according to the characteristics of the problem. Numerical
testing is supported by one of the most advanced semiconductor enterprises and the computational results show significant
improvement compared with the traditional manual sequence results. 相似文献
124.
Jungyong Wang Ayhan Akinturk Neil Bose Stephen J. Jones Yun Young Song Ho Hwan Chun Moon Chan Kim 《Journal of Marine Science and Technology》2008,13(3):244-255
The objective of this study was to investigate the performance of a model azimuthing podded propulsor in ice-covered water.
Model tests were carried out with two different depths of cut into the ice (15 and 35 mm), two different ice conditions (presawn
and pack ice conditions), and four different azimuthing angles. The depth of cut is the maximum penetration depth of the propeller
blade into the ice block. The 0.3-m-diameter model propeller was operated in a continuous ice milling condition. Ice loads
were measured by several sensors which were installed in various positions on the model. Six one-axis pancake-style load cells
on the top of the model measured the global loads and two six-component dynamometers were installed on the shaft to measure
the shaft loads. One six-component dynamometer was attached to the one of the propeller blades inside the hub to measure the
blade loads. The pod unit and propeller performance in ice are presented. Ice-related loads, which were obtained when the
blade was inside the ice block, are introduced and discussed. During the propeller–ice interaction, a blade can experience
the path generated by the previous blade, which is called the shadowing effect. The effects of shadowing, depth of cut, azimuthing
angle, and advance coefficient on propulsor performance are presented and discussed. 相似文献
125.
Khanh Toan Dam Katsutoshi Tanimoto Eldina Fatimah 《Journal of Marine Science and Technology》2008,13(3):223-230
This paper presents a discussion of the characteristics of ship waves in a narrow channel restricted by vertical walls, based
on observed data and the results computed by a 2-D model. In the numerical model, the propagation of waves generated by a
moving ship is simulated by solving 2-D depth-integrated Boussinesq equations. To get the boundary conditions at the location
of the ship, the slender-ship approximation is employed. A field observation was carried out at a straight length of navigation
channel. The ships targeted in the observations are two kinds of waterbuses with lengths of 28 and 24 m. The relative depth
Froude number for the river current, an appropriate parameter for assessing the influence of the current on ship wave characteristics
in a navigation channel, ranged from 0.47 to 0.76. The observed maximum wave height varied between 0.13 and 1.26 m. The maximum
wave height of the wave train is sharply increased when the relative depth Froude number exceeds 0.6. The results computed
by the present model agree fairly well with the observed data. 相似文献
126.
基于SPH方法的波浪对水平板冲击的数值模拟(英文) 总被引:1,自引:0,他引:1
A numerical model was established for simulating wave impact on a horizontal deck by an improved incompressible smoothed particle
hydrodynamics (ISPH). As a grid-less particle method, the ISPH method has been widely used in the free-surface hydrodynamic
flows with good accuracy. The improvement includes the employment of a corrective function for enhancement of angular momentum
conservation in a particle-based calculation and a new estimation method to predict the pressure on the horizontal deck. The
simulation results show a good agreement with the experiment. The present numerical model can be used to study wave impact
load on the horizontal deck. 相似文献
127.
The effect of uniform current on the generation of flexural gravity waves resulting from initial disturbances at a point was
analyzed in two dimensions. The problem was formulated as an initial boundary value problem under the assumptions of the linearized
theory of water waves. By direct application of the Laplace transform and then the Fourier transform, explicit expressions
for the velocity potential and free surface elevation were obtained in integral forms; these were evaluated asymptotically
for large distances and times by the application of the method of the stationary phase to obtain the far field behavior of
the surface elevations in specific cases. Simple numerical computations were performed to illustrate the effect of uniform
current on the surface elevation, wavelength, phase velocity, and group velocity of the flexural gravity waves and on the
far field behavior of the progressive waves in two different cases, namely, when there is an initial depression concentrated
at the origin and an initial impulse concentrated at the origin. 相似文献
128.
George Simopoulos Dimitris Konovessis Dracos Vassalos 《Journal of Marine Science and Technology》2008,13(2):164-177
In the light of the newly developed harmonised probabilistic damage stability regulations, set to come into force in 2009,
this article presents a systematic and thorough analysis of the sensitivity of the Attained Subdivision Index with reference
to a wide range of related design parameters. The sensitivity of the probabilistic regulations was investigated for a typical
large RoPax vessel, with variation of parameters, such as the number, positioning and local optimisation of transverse bulkheads;
the presence and position of longitudinal bulkheads below the main vehicle deck; the presence of side casings; and the height
of the main deck and double bottom. The effects of water on deck and of operational parameters (draught, centre of gravity
and trim) were also investigated. The results of the study, presented in graphical form, can provide valuable assistance to
the designer when determining subdivision characteristics at the very early stage of the design process, resulting in optimal,
efficient and safe ships. 相似文献
129.
An acoustic vector sensor (AVS) can capture more information than a conventional acoustic pressure sensor (APS). As a result, more output channels are required when multiple AVS are formed into arrays, making processing the data stream computationally intense. This paper proposes a new algorithm based on the propagator method for wideband coherent sources that eliminates eigen-decomposition in order to reduce the computational burden. Data from simulations and lake trials showed that the new algorithm is valid: it resolves coherent sources, breaks left/right ambiguity, and allows inter element spacing to exceed a half-wavelength. 相似文献
130.
To evaluate the clinical outcome, effectiveness and safety of the surgical management of traumatic lumbar spondylolisthesis
with transforaminal lumbar interbody fusion (TLIF) with short segmental instrumentation fixation. A retrospective review of
a consecutive series of 24 patients with traumatic lumbar spondylolisthesis treated with TLIF procedure was carried out. Intraoperative
spinal cord monitoring was used to confirm the peripheral neural function intact during the reduction of the spondylolisthesis.
Preoperative clinical and radiographic evaluation of all cases were originally collected prospectively. Data regarding blood
loss, operative time, duration of hospital stay, radiographic fusion, instrumentation failure and clinical result were collected
and observed at regular follow-up periods. All patients were engaged in high-energy accidents in the lower back and 16 patients
had concomitant injuries. The mean operative time was 124 min, mean blood loss was 350 mL, and mean hospital stay was 6.5
days. There were no complications such as incision infection, cerebrospinal fluide (CSF) leakage and nerve root injury and
so on. All patients demonstrated a solid lumbar interbody fusion within 4 months, and no evidence of spondylolisthesis correction
loss, instrumentation failure and loosing. They all were completely asymptomatic, with normal neurologic findings, and had
resumed their previous level of physical activities on the final follow-up. Meticulous clinical examination and careful imaging
assessment could assist an early diagonosis in cases of traumatic lumbar spondylolisthesis. Performing open reduction and
the TLIF procedure as soon as possible could restore segmental stability and painless function. The TLIF procedure was a safe,
effective technique to treat traumatic lumbar spondylolisthesis. 相似文献