A study on the relationships among hand muscles and form factors of large-screen curved mobile devices

The aim of this study is to determine the effect of form factors (curvature rate, depth) of mobile devices on hand comfort when using large-screen curved mobile devices. To that end, four muscles (APB, APL, FDI, EDC) were selected and mockups for experiment were developed with four curvature rate levels (flat/100/200/300R) and five depth levels (3/5/7/9/11 mm). User experiment was conducted using three interactions (tapping, dragging, and texting) that usually take place on smartphones. EMG signal of each participant was measured. Combination of curvature and depth could maximize the physical comfort of hands and fingers through the experiment so that the interaction effect between form factors and tasks could be identified. Our results revealed that only APL and FDI had statistically significant muscle activity amounts across the curvature rates. With respect to effect of depth, all four muscles showed statistically significant difference in muscle activity. Moreover, results from the interaction effect among task levels of two tasks (target location of tapping and direction of dragging) and two form factors showed no interaction effect in either tapping or texting. The results of this study could be used to determine the optimal range for form factors of curved screen mobile devices in terms of physical comfort of the hand while using large-screen devices.     

引入零视差缓冲的DIBR改良方法

针对图像部分像素深度值失真,导致图像变形后物体边缘失真的问题,提出了一种引入“零视差缓冲”的方法。首先选取四幅具有不同复杂程度场景的图像,引入零视差缓冲对图像进行变形,其次采用传统图像质量评价体系（结构相似度SSIM和模糊系数K）对得到的图像进行质量评价,最后对比传统DIBR方法和引入零视差缓冲方法得到的视点图中物体边缘的表现。实验结果表明,该方法对于变形图像的SSIM平均提高了4.66%, K平均下降了1.73%。提高了视点图中物体边缘的质量,提高了3D图像的整体质量。     

建筑设计企业的市场营销策略探讨

建筑设计企业要以市场为导向,明确自身在市场中的地位,直面激烈的竞争。为实现效益最大化原则,建筑设计企业必须采取全新的市场营销策略,从竞争对手中突围,继而处于领先地位。本文通过分析,提出一些市场营销策略以供参考。     

贯入法检测砂浆抗压强度的试验研究

通过的砌筑自拌混合砂浆、预拌混合砂浆、水泥砂浆、专用砌筑砂浆及自拌抹灰砂浆、预拌抹灰砂浆、专用抹灰砂浆试块,进行贯入深度和抗压强度之间关系的试验,建立了各种砂浆的测强曲线,对其进行误差范围的分析,确定贯入法检测砂浆抗压强度测强曲线的分类,为JGJ/T136-2001的修编提供依据。     

快速成型中STL模型直接切片新算法研究

提出基于快速成型中STL模型直接切片新算法。读取二进制STL模型信息,创建三角面片矩阵;采用二分查找算法实现三角面片与切平面相交分组;再对每一组中三角面片与相交切平面求其交点获得相交线段,去除相交线段间的冗余节点;最后用深度优先搜索算法对切平面中相交线段优化创建轮廓线路径。此算法避免了切平面与三角面片位置关系的判断和建立三角面片之间拓扑信息关系,在切片耗时上具有明显的优势。     

复杂地形下人工挖孔灌注桩施工工艺研究

从传统人工挖孔灌注桩施工工艺角度入手，结合工程地质条件的复杂因素和现场环境恶劣的情况，对作业条件、施工技术可行性、环境制约因素，进行了深度技术分析，提出了经济的施工方案，采用新技术和自制简易机具，有效地解决了施工中的难题。     

机械控深盲孔技术开发与研究

文章对影响机械控深盲孔的因素（层压厚度公差、机械钻机的深度控制能力等）进行研究，同时对机械控深盲孔PCB的制作流程进行平行试验研究；得出机械控深盲孔的制作精度，机械控深盲孔PCB的制作工艺参数，机械控深盲孔应用的潜在失效模式，并提出一些改善建议。     

Gaussian-Hermite moment-based depth estimation from single still image for stereo vision

Depth information of objects plays a significant role in image-based rendering. Traditional depth estimation techniques use different visual cues including the disparity, motion, geometry, and defocus of objects. This paper presents a novel approach of focus cue-based depth estimation for still images using the Gaussian-Hermite moments (GHMs) of local neighboring pixels. The GHMs are chosen due to their superior reconstruction ability and invariance properties to intensity and geometric distortions of objects as compared to other moments. Since depths of local neighboring pixels are significantly correlated, the Laplacian matting is employed to obtain final depth map from the moment-based focus map. Experiments are conducted on images of indoor and outdoor scenes having objects with varying natures of resolution, edge, occlusion, and blur contents. Experimental results reveal that the depth estimated from GHMs can provide anaglyph images with stereo quality better than that provided by existing methods using traditional visual cues.     

Optimal depth recovery using image guided TGV with depth confidence for high-quality view synthesis

This paper presents a new depth image recovery method for RGB-D sensors giving a complete, sharp, and accurate object shape from a noisy boundary depth map. The proposed method uses the image guided Total Generalized Variation (TGV) with the depth confidence. A new directional hole filling method of view synthesis is also investigated to produce natural texture in hole regions whereas reducing blurring effect and preventing distortion. Thus, a high-quality image view can be achieved. Experimental results show that the proposed method yields higher quality recovered depth maps and synthesized image views than other previous methods.     

The influence of depth of cut on the machinability of an alloyed austempered ductile iron

The volume fraction of high carbon austenite present in the microstructure of austempered ductile iron (ADI) is one of the important factors that influence the mechanical and physical properties of the alloy. Formation of martensite by TRIP (transformation induced plasticity) mechanism during the machining operation in which a large amount of stress is applied to the microstructure results in a decrease in machinability of austempered ductile iron which has affected the expansion of ADI in industry. In this article, the effect of depth of cut as a machining variable is assessed in an alloyed austempered ductile iron containing Cu, Ni and Mo. The measurements of mechanical properties including impact energy, tensile strength, hardness and microhardness along the cross-section of samples are reported for samples austenitized at 870 °C followed by austempering at 375, 340 and 300 °C. Results indicate that contrary to the behavior of many alloys, in austempered ductile iron, reducing the depth of cut will not improve the machinability. In the case of studied composition, cutting with depths of 0.5 and 0.1 mm had the best and worst results, respectively.