Application of Three-dimensional Teaching Mode in College English Teaching

The three-dimensional teaching mode is an integrated teaching mode,which integrates teaching design,teaching methods,teaching resources and student learning.In the English classroom,the three-dimensional teaching mode is used to make the English learning class full of vitality and to improve the effect of English classroom teaching.

An Efficient Three-Dimensional Coupled Normal Mode Model and Its Application to Internal Solitary Wave Problems

We present an efficient three-dimensional coupled-mode model based on the Fourier synthesis technique. In principle, this model is a one-way model, and hence provides satisfactory accuracy for problems where the forward scattering dominates. At the same time, this model provides an efficiency gain of an order of magnitude or more over two-way coupled-mode models. This model can be applied to three-dimensional range-dependent problems with a slowly varying bathymetry or internal waves. A numerical example of the latter is demonstrated in this work. Comparisons of both accuracy and efficiency between the present model and a benchmark model are also provided.

Establishment of a Kind of Three-dimensional Thunderstorm Cloud Electrification-Discharge Mode

[Objective] The research aimed to study the establishment of a kind of three-dimensional thunderstorm cloud electrification-discharge mode.[Method] Based on a kind of three-dimensional strong convective cloud mode,several parameterization schemes of electrification-discharge mechanism which were mature and had experimental basis were coupled into the strong convective cloud mode.The three-dimensional strong convective mode could simulate electrification-discharge process,and the three-dimensional thunderstorm cloud electrification-discharge mode was established.[Result] By numerical simulation method,a kind of three-dimensional thunderstorm cloud electrification-discharge mode was established.The mode not only could assess the relative importance of various kinds of electrification mechanisms under different environments,but also described formation of charge center and electrical field within the thunderstorm cloud,occurrence position,propagation process and influence on charge distribution of lightning.The most important thing was that it could quantitatively describe the complicated relative relationships between power,microphysics and electric process in the evolution process of thunderstorm cloud.[Conclusion] The research provided powerful foundation for further studying the lightning characteristics of different thunderstorm clouds,the relationships between lightning characteristics and power,microphysical process,and deeply discussing the early-warning forecasting technology of thunderbolt activity.

Clinical Application of Surface Mode on Three-dimensional Ultrasonography: A Preliminary Study

To investigate the methodology and evaluate the clinical value of surface mode on three- dimensional ultrasonography (3DUS) in static anatomical structures, 62 patients with various diseases were studied. The equipment used here was Voluson 530D 3DUS imaging system and 3D volume trahsducer with frequency being 3. 0-5. 0 MHz. The 3DUS rendering method was surface mode. The results showed that: 1 ) Surface mode of 3DUS could demonstrate clearly the anatomical characteristics of the region-of-interest (ROI) and the inner wall of lesions or organs that contained fluid. The anatomic details, such as location, size, shape, and number of the ROI, could be visualized intuitively; 2) The outer anatomic features (e. g. contour, edge, configuration, etc. ) of some organs or lesions surrounded by fluid could be displayed clearly. It could be concluded that surface mode on 3DUS could provide more diagnostic information than two-dimensional ultrasonography (2DUS) in some cases and could served as a beneficial supplement to ZDUS in clinical practice.

Helical Mode Absolute Statistical Equilibrium of Ideal Three-Dimensional Hall Magnetohydrodynamics

Using the Fourier helical decomposition, we obtain the absolute statistical equilibrium spectra of left- and right-handed helical modes in the incompressible ideal Hall magnetohydrodynamics (MHD). It is shown that the left-handed helical modes play a major role on the spectral transfer properties of turbulence when the generalized helicity and magnetic helicity are both positive. In contrast, the right-handed helical modes will play a major role when both are negative. Furthermore, we also find that if the generalized helicity and magnetic helicity have opposite signs, the tendency of equilibrium spectra to condense at the large or small wave numbers will be presented in different helical sectors. This indicates that the generalized helicity dominates the forward cascade and the magnetic helicity dominates the inverse cascade properties of the Hall MHD turbulence.

Research on the Field Setting and Teaching Mode and the Influences on the Effect of Volleyball Teaching in Colleges and Universities

This paper conducts the analysis on the fleld setting and teaching mode and the influences on the effect of volleyball teaching in colleges and universities. The volleyball class organization form must vivid, be lively, be diverse and the core teaching method and the method also want novel changeable, cannot always the same old story. If the warming-up exercise each time all is jogs with the empty-handed exercises, the student can produce was sick of that cannot raise any interest, the effect cannot be good. In the sports teaching, and that provides the feedback information promptly in the establishment appropriate effective goal in the foundation, in addition the qualitative appraisal, namely the full use goal establishment and the feedback information. We promote the traditional teaching method by integrating the latest methodologies that will be meaningful.

一种基于粗糙熵的改进K-modes聚类算法

K-modes聚类算法被广泛应用于人工智能、数据挖掘等领域。传统的K-modes聚类算法有不错的聚类效果,但是存在迭代次数多、计算量大、容易受到冗余属性的干扰等问题,且仅采用简单的0-1匹配的方法来定义2个样本属性值之间的距离,没有充分考虑每个属性对聚类结果的影响。针对上述问题,该文将粗糙熵引入K-modes算法。首先利用粗糙集属性约简算法消除冗余属性,确定各属性的重要程度;然后利用粗糙熵确定每个属性的权重,从而定义新的类内距离。将该文所提算法与传统的K-modes聚类算法分别在4组公开数据集上进行对比试验。试验结果表明,该文所提算法聚类准确率比传统的K-modes聚类算法更高。

Three-dimensional physical simulation and optimization of water injection of a multi-well fractured-vuggy unit

With complex fractured-vuggy heterogeneous structures, water has to be injected to facilitate oil pro- duction. However, the effect of different water injection modes on oil recovery varies. The limitation of existing numerical simulation methods in representing fractured- vuggy carbonate reservoirs makes numerical simulation difficult to characterize the fluid flow in these reservoirs. In this paper, based on a geological example unit in the Tahe Oilfield, a three-dimensional physical model was designed and constructed to simulate fluid flow in a fractured-vuggy reservoir according to similarity criteria. The model was validated by simulating a bottom water drive reservoir, and then subsequent water injection modes were optimized. These were continuous （constant rate）, intermittent, and pulsed injection of water. Experimental results reveal that due to the unbalanced formation pressure caused by pulsed water injection, the swept volume was expanded and consequently the highest oil recovery increment was achieved. Similar to continuous water injection, intermit- tent injection was influenced by factors including the connectivity of the fractured-vuggy reservoir, well depth, and the injection-production relationship, which led to a relative low oil recovery. This study may provide a constructive guide to field production and for the devel- opment of the commercial numerical models specialized for fractured-vuggy carbonate reservoirs.

Shear behavior of intact granite under thermo-mechanical coupling and three-dimensional morphology of shear-formed fractures

The shear failure of intact rock under thermo-mechanical(TM)coupling conditions is common,such as in enhanced geothermal mining and deep mine construction.Under the effect of a continuous engineering disturbance,shear-formed fractures are prone to secondary instability,posing a severe threat to deep engineering.Although numerous studies regarding three-dimensional(3D)morphologies of fracture surfaces have been conducted,the understanding of shear-formed fractures under TM coupling conditions is limited.In this study,direct shear tests of intact granite under various TM coupling conditions were conducted,followed by 3D laser scanning tests of shear-formed fractures.Test results demonstrated that the peak shear strength of intact granite is positively correlated with the normal stress,whereas it is negatively correlated with the temperature.The internal friction angle and cohesion of intact granite significantly decrease with an increase in the temperature.The anisotropy,roughness value,and height of the asperities on the fracture surfaces are reduced as the normal stress increases,whereas their variation trends are the opposite as the temperature increases.The macroscopic failure mode of intact granite under TM coupling conditions is dominated by mixed tensileeshear and shear failures.As the normal stress increases,intragranular fractures are developed ranging from a local to a global distribution,and the macroscopic failure mode of intact granite changes from mixed tensileeshear to shear failure.Finally,3D morphological characteristics of the asperities on the shear-formed fracture surfaces were analyzed,and a quadrangular pyramid conceptual model representing these asperities was proposed and sufficiently verified.

Three-Dimensional Scattering of an Incident Plane Shear Horizontal Guided Wave by a Partly through-Thickness Hole in a Plate

We investigate the three-dimensional （3D） scattering problem of an incident plane shear horizontal wave by a partly through-thickness hole in an isotropic plate, in which the Lamb wave modes are also included due to the mode conversions by the scattering obstacle in the 3D problem. An analytical model is presented such that the wave fields are expanded in all of propagating and evanescent SH modes and Lamb modes, and the scattered far-fields of three fundamental guided wave modes are analyzed numerically for different sizes of the holes and frequencies. The numerical results are verified by comparing with those obtained by using the approximate Poisson/Mindlin plate model for small hole radius and low frequency. It is also found that the scattering patterns are different from those of the SO wave incidence. Our work is useful for quantitative evaluation of the plate-like structure by ultrasonic guided waves.

Research on the Precision Instrument Reliability and Antiinterference Mode from the Intrusion Detection Angle based on Rough Set

In this paper, we conduct research on precision instrument reliability and anti-interference mode from the intrusion detectionangle based on rough set. Ultra-precision machining applications range from soft metal to hardened steel, stainless steel, high speed steel,cemented carbide and some other hard processing material, to the semiconductor, glass, ceramics and the other hard brittle non-metallic materials,almost all materials available ultra-precision machining technology for the processing. To enhance the robustness of the mentioned equipment,we consider the integration of the rough set and intrusion detection to modify the corresponding issues that will optimize the traditional methodsfrom systematical level which holds special signifi cance.

Development of A Three-Dimensional Guidance System for Long-Range Maneuvering of A Miniature Autonomous Underwater Vehicle

The present paper introduces a three-dimensional guidance system developed for a miniature Autonomous Underwater Vehicle（AUV）. The guidance system determines the best trajectory for the vehicle based on target behavior and vehicle capabilities. The dynamic model of this novel AUV is derived based on its special characteristics such as the horizontal posture and the independent diving mechanism. To design the guidance strategy, the main idea is to select the desired depth, presumed proportional to the horizontal distance of the AUV and the target. By connecting the two with a straight line, this strategy helps the AUV move in a trajectory sufficiently close to this line. The adjacency of the trajectory to the line leads to reasonably short travelling distances and avoids unsafe areas. Autopilots are designed using sliding mode controller. Two different engagement geometries are considered to evaluate the strategy＇s performance： stationary target and moving target. The simulation results show that the strategy can provide sufficiently fast and smooth trajectories in both target situations.

Hanoi Public TransportmTransformation by Management Using Action Research and Behavior Setting Theory

After the economic reforms in Vietnam, the number of motorbikes surged while public transport lost its passengers. No funds for investment available TRAMOC （Transport Management and Operation Centre）, the Transport Management and Operation Center started the experiment of transforming Hanoi Public Transport by management based on action research, introducing some interventions, which had shown to be effective in Europe. Phase I of the experimental approach was carried out with the smallest company that operated Line 32. The number of daily passengers surged from 1,700 to 8,000. In Phase II, the experiment was extended to the whole net. In 2001, there were 35,000 passengers per day, in 2010, there were 1 million; this is an increase of 3,000%. The result surpassed by far the expectations. The key for understanding the surprising results is the mode choice. 53% of the users are riders by choice; they have access to a car or motorbike. Simulation of the decisions as rational choice based on time needed for trips was proved to be quite accurate. Behavior was analyzed in the frame of behavior setting theory, which brings together urban structure and the design of the transport system. Success with introducing public transport needs a self-reliant leadership, which works with people in their real life situation. An urban transport system is part of the organized behavior of the people, who make use of the technical opportunities offered.

OBE模式下翻转实验课堂设计方法——以SET协议实验课堂为例

OBE模式与翻转课堂的结合使得教学方式更有利于培养目标的达成,文章针对信息管理与信息系统专业信息系统安全课程,使用布鲁姆目标分类理论确定课程的培养目标,选取SET协议模拟实验系统设计项目,使用理查德课程设计模型构建翻转实验课堂的组织步骤及考核体系。结果表明,OBE理念下以学生为主体的翻转实验课堂教学模式使学生学习目标更为明确,团队合作意识更强,同时知识的综合运用能力和创新能力均能得到有效提升,相比于传统实验课堂,翻转实验课堂对于培养目标的达成更为有效。

基于二维查找表的SET耦合注入方法

随着器件特征尺寸的减小,利用独立电流源进行单粒子瞬态(Single Event Transient,SET)注入的方法与实际脉冲存在很大误差,器件/电路混合模拟能与实际较好符合,但在大规模组合逻辑的软错误率分析中使用器件/电路混合模拟非常耗时,急需电路级快速的SET注入方法。针对0.18μm CMOS反相器构建了基于二维查找表的SET耦合注入方法,并与器件/电路混合模拟的结果进行比较。结果发现:基于二维查找表的SET耦合注入方法与器件/电路混合模拟方法的结果比较符合,而仿真速度比器件/电路混合模拟快3个数量级。

SET支付协议的形式化分析与改进

使用运行模式法对SET支付协议的简化版本即Lu-Smolka协议进行了形式化分析,找到了6种不同的攻击形式,其中4种是新发现的攻击,通过对这6种攻击形式的深入分析和分类,发现了原协议中存在的漏洞,最后对该协议进行了改进,从而有效避免了以上6种攻击,提高了协议的安全性。

粗糙K-Modes聚类算法

Michael K.Ng等人提出了新K-Modes聚类算法,它采用基于相对频率的启发式相异度度量方法,有效地提高了聚类精度,但不足的是在计算各类的属性分类值频率时假定类中样本对聚类的贡献相同。为了考虑类中样本对类中心的不同影响,提出一种粗糙K-Modes算法,通过粗糙集的上、下近似度量数据样本在类内的重要性程度,不仅可以获得比新K-Modes算法更好的聚类效果,而且可以在保证聚类效果的基础上降低白亮等人提出的基于粗糙集改进的K-Modes算法的计算复杂度。对几个UCI的数据集的测试实验结果显示出新算法的优良性能。

SET支付协议简化版本的运行模式分析

主要使用运行模式法对简化的SET支付协议即Lu-Smolka协议进行了形式化分析,通过分析找到了六种不同的攻击形式,其中四种是新发现的攻击,并且对这六种攻击形式进行了深入的分析,发现了其中的差异和可能造成的潜在攻击,最后根据攻击的特征对这六种攻击进行了分类。

3D Multiphase Piecewise Constant Level Set Method Based on Graph Cut Minimization

Segmentation of three-dimensional(3D) complicated structures is of great importance for many real applications.In this work we combine graph cut minimization method with a variant of the level set idea for 3D segmentation based on the Mumford-Shah model.Compared with the traditional approach for solving the Euler-Lagrange equation we do not need to solve any partial differential equations.Instead,the minimum cut on a special designed graph need to be computed.The method is tested on data with complicated structures.It is rather stable with respect to initial value and the algorithm is nearly parameter free.Experiments show that it can solve large problems much faster than traditional approaches.

面向不完备分类型矩阵数据的集对k-modes聚类算法

为了解决具有不完备、分类型矩阵数据集的聚类问题,同时考虑样本和类簇间的不确定关系,提出了一种面向不完备分类型矩阵数据的集对k-modes聚类算法.首先,基于集对信息粒的相关理论,定义了不完备矩阵样本间的集对距离度量方法;其次,考虑样本和类簇间的不确定关系,给出了类内平均距离的定义和判断样本是否属于多个类簇的阈值计算公式,进而形成包含正同域,边界域和负反域的集对聚类结果;最后,通过选取的3个矩阵数据集与四个对比算法进行实验评价,实验结果表明集对k-modes聚类算法可以有效处理不完备分类型矩阵数据集,并且在准确率、召回率、调整兰德系数和标准化互信息等指标上均有良好的聚类性能.