Direction

方向
  • 文章类型: Journal Article
    灵活性的增强,能源效率,和环境友好是城市基础设施发展中公认的趋势。各种类型的运输车辆的激增加剧了交通管制的复杂性。智能交通系统,利用实时交通状态预测技术,比如速度估计,成为有效管理和控制城市道路网络的可行解决方案。该项目的目的是解决使用深度学习技术提高大规模预测交通状况准确性的复杂任务。为了完成研究的目的,使用了一定时间范围内巴黎和伊斯坦布尔的历史交通数据,考虑到速度等变量的影响,交通量,和方向。具体来说,交通电影片段基于2年的现实世界数据为两个城市被利用。这些电影是使用从大量车队收集的超过1000亿个GPS(全球定位系统)探测点获得的HERE数据生成的。我们提出的模型,与以前的大多数不同,考虑到速度的累积影响,流量,和方向。与众所周知的模型相比,开发的模型显示出更好的结果,特别是,与SR-ResNet模型相比。巴黎和伊斯坦布尔的像素级MAE(平均绝对误差)值分别为4.299和3.884,与SR-ResNET的4.551和3.993相比。因此,所创建的模型展示了进一步提高智能交通系统的准确性和有效性的可能性,特别是在大型城市中心,从而促进提高安全性,能源效率,为道路使用者提供便利。获得的结果将对负责基础设施发展规划的当地决策者有用,以及该领域的专家和研究人员。未来的研究应该调查如何纳入更多的信息来源,特别是来自物理交通流模型的先前信息,有关天气状况的信息,等。进入深度学习框架,以及进一步增加生产能力和减少处理时间。
    The enhancement of flexibility, energy efficiency, and environmental friendliness constitutes a widely acknowledged trend in the development of urban infrastructure. The proliferation of various types of transportation vehicles exacerbates the complexity of traffic regulation. Intelligent transportation systems, leveraging real-time traffic status prediction technologies, such as velocity estimation, emerge as viable solutions for the efficacious management and control of urban road networks. The objective of this project is to address the complex task of increasing accuracy in predicting traffic conditions on a big scale using deep learning techniques. To accomplish the objective of the study, the historical traffic data of Paris and Istanbul within a certain timeframe were used, considering the impact of variables such as speed, traffic volume, and direction. Specifically, traffic movie clips based on 2 years of real-world data for the two cities were utilized. The movies were generated with HERE data derived from over 100 billion GPS (Global Positioning System) probe points collected from a substantial fleet of automobiles. The model presented by us, unlike the majority of previous ones, takes into account the cumulative impact of speed, flow, and direction. The developed model showed better results compared to the well-known models, in particular, in comparison with the SR-ResNet model. The pixel-wise MAE (mean absolute error) values for Paris and Istanbul were 4.299 and 3.884 respectively, compared to 4.551 and 3.993 for SR-ResNET. Thus, the created model demonstrated the possibilities for further enhancing the accuracy and efficacy of intelligent transportation systems, particularly in large urban centres, thereby facilitating heightened safety, energy efficiency, and convenience for road users. The obtained results will be useful for local policymakers responsible for infrastructure development planning, as well as for specialists and researchers in the field. Future research should investigate how to incorporate more sources of information, in particular previous information from physical traffic flow models, information about weather conditions, etc. into the deep learning framework, as well as further increasing of the throughput capacity and reducing processing time.
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  • 文章类型: Journal Article
    背景:目的是评估桡骨远端骨折的方向及其与尺骨头的关系。
    方法:我们回顾了160张腕部X光片。骨折线是在相对于前臂长轴的后前片和外侧片以及与尺头的关系上测量的。
    结果:PAX光片:骨折线以11%的比例从尺骨远端到桡骨近端(尺骨到桡骨),横向在74%和远端桡骨到近端尺骨(桡骨到尺骨)在16%。侧位X线照片:88%的骨折线从掌侧远端到背侧近端,横向两个1%,背侧至掌侧11%。径向移位(7.5%)仅发生在尺骨至radial骨或横向骨折中。尺骨至radial骨骨折线始于尺骨头/远端射尺关节的近端,占88%。桡骨至尺骨骨折线开始在远端射尺关节近端平均2.5mm处结束(p<0.01)。横向骨折线开始于远端射尺关节的底部,占53%,近端占47%。
    结论:有两种不同的冠状模式:径向至尺骨末端c。远端射尺关节近端2毫米;从近端射尺关节开始的尺骨至桡骨。可能有第三种模式-横向裂缝;这些可能是上述的变体。矢状的主要方向是手掌到背侧,但有11%是正面的。这是对关节外桡骨远端骨折不同骨折模式的首次描述。此外,断裂模式似乎与力传递的不同方向相关,这符合我们对跌倒的理解以及手腕/手与地面的相对不受控制的冲击。骨折传播的这些模式有助于了解腕关节骨折的生物力学,并可以预测塌陷。
    BACKGROUND: The aim was to assess the direction of distal radius fractures and their relationship to the ulnar head.
    METHODS: We reviewed the 160 wrist radiographs. The fracture line was measured on the postero-anterior and lateral radiographs relative to the long axis of the forearm and the relationship to the ulnar head.
    RESULTS: PA radiographs: the fracture line ran distal ulnar to proximal radial (ulnar to radial) in 11%, transverse in 74% and distal radial to proximal ulnar (radial to ulnar) in 16%. Lateral radiographs: the fracture line ran distal volar to proximal dorsal in 88%, transverse in two 1% and dorsal to volar in 11%. Radial shift (7.5%) only occurred with ulnar to radial or transverse fractures. The ulnar to radial fracture line started at the proximal end of the ulnar head/distal radio-ulnar joint in 88%. The radial to ulnar fracture line started ended a mean of 2.5 mm proximal to the distal radio-ulnar joint (p < 0.01). The transverse fracture line started at the base of the distal radio-ulnar joint in 53% and proximally in 47%.
    CONCLUSIONS: There are two distinct coronal patterns: radial to ulnar ending c. 2 mm proximal to the distal radio-ulnar joint; ulnar to radial starting at the proximal distal radio-ulnar joint. There may be third pattern - transverse fractures; these may be variants of the above. Sagittally the main direction is volar to dorsal but 11% are obverse. This is the first description of distinct fracture patterns in extra-articular distal radius fractures. In addition the fracture patterns appear to correlate with different directions of force transmission which fit with our understanding of falling and the relatively uncontrolled impact of the wrist/hand with the ground. These patterns of fracture propagation help understand how the biomechanics of wrist fractures and may enable prediction of collapse.
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  • 文章类型: Journal Article
    运动速度和方向是哺乳动物视觉系统的两个基本线索。新大脑皮层各个地方的神经元在发射频率方面显示出速度和方向的调谐特性。本研究将32通道脑电图(EEG)系统应用于13位人类受试者,同时他们在计算机监视器上观察从视野中心到外围的各个方向以不同速度移动的单个物体。根据实验条件,受试者要么被要求在物体移动时将视线固定在监护仪的中心,要么被要求用视线跟踪运动;眼睛跟踪眼镜用于确保他们遵循指令.在每次审判中,运动速度和方向随机独立变化,形成两个相互竞争的视觉特征。分别对每个提示进行EEG信号分类(例如,11个速度值或11个方向),不管其他线索的变化。在眼睛固定的条件下,多个受试者对运动方向比速度表现出不同的偏好;然而,两个异常值对速度表现出极好的敏感性。在眼动追踪条件下,其中EEG信号可能包含眼睛运动信号,所有受试者对运动方向的分类主要较好.存在速度和方向由不同电极位点编码的趋势。由于EEG是一种适用于脑机接口(BCI)的非侵入性和便携式方法,这项研究提供了有关视觉系统基础知识以及基于视觉刺激的BCI应用的见解。
    Motion speed and direction are two fundamental cues for the mammalian visual system. Neurons in various places of the neocortex show tuning properties in term of firing frequency to both speed and direction. The present study applied a 32-channel electroencephalograph (EEG) system to 13 human subjects while they were observing a single object moving with different speeds in various directions from the center of view to the periphery on a computer monitor. Depending on the experimental condition, the subjects were either required to fix their gaze at the center of the monitor while the object was moving or to track the movement with their gaze; eye-tracking glasses were used to ensure that they followed instructions. In each trial, motion speed and direction varied randomly and independently, forming two competing visual features. EEG signal classification was performed for each cue separately (e.g., 11 speed values or 11 directions), regardless of variations in the other cue. Under the eye-fixed condition, multiple subjects showed distinct preferences to motion direction over speed; however, two outliers showed superb sensitivity to speed. Under the eye-tracking condition, in which the EEG signals presumably contained ocular movement signals, all subjects showed predominantly better classification for motion direction. There was a trend that speed and direction were encoded by different electrode sites. Since EEG is a noninvasive and portable approach suitable for brain-computer interfaces (BCIs), this study provides insights on fundamental knowledge of the visual system as well as BCI applications based on visual stimulation.
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  • 文章类型: Journal Article
    背景:一项使用直导管的旧的回顾性研究认为,上行出口部位是最糟糕的频繁ESI。尚未对使用天鹅颈导管的3个出口部位方向进行比较研究,以确定哪个方向最适合我们的终点。易于看到出口现场的背面区域:ESBE,易于消毒出口现场的背面区域:EDBE,减少两个出口部位感染(ESI),有症状的导管脱位和腹膜炎。
    方法:我们在定量横截面中评估了出口部位方向与终点的关系,多中心问卷调查。接受非手术导管植入或出口手术的患者被排除在外。
    结果:纳入291例患者的出口方向数量(百分比)上升79(26.0),横向108(37.5)和向下105(36.5)。Cochran-Armitage分析显示,随着方向从向上向横向向向下变化,ESI的患病率显着逐步增加(0.15±0.41、0.25±0.54、0.38±0.69发作/患者年,p=0.03)。多变量回归分析显示,高出口位点独立地与ESBE的出现频率较高(OR5.55,95%CI2.23-16.45,p<0.01)和ESI患病率降低(OR0.55,95CI0.27-0.98,p=0.04)。症状性导管脱位的患病率与ESI呈正相关(OR2.84,95%CI1.27-7.82,p=0.01),观察到EDBE与症状性导管脱位(OR0.27,95%CI0.11-0.72)或腹膜炎(OR0.48,95%CI0.23-0.99)的患病率呈负相关.
    结论:向上的天鹅颈导管出口可能是ESBE和预防ESI的最佳选择。EDBE可以减少导管脱位和腹膜炎。有症状的导管脱位可以预测ESI。
    BACKGROUND: Upward-directed exit-site has been believed to be the worst for frequent ESI by an old retrospective study using straight catheters. No comparison study of 3 exit-site directions using swan-neck catheter has been performed regarding which direction is the best for our endpoints, Easy-to-see the backside area of exit-site: ESBE, Easy-to-disinfect the backside area of exit-site: EDBE, reduction of both exit-site infection (ESI), symptomatic catheter dislocation and peritonitis.
    METHODS: We assessed the relationship of exit-site direction with our endpoints in a quantitative cross-sectional, multicentered questionnaire survey. Patients who received either non-surgical catheter implantation or exit-site surgery were excluded.
    RESULTS: The numbers (percentage) of exit-site directions in included 291 patients were upward 79 (26.0), lateralward 108 (37.5) and downward 105 (36.5). Cochran-Armitage analysis showed a significant step-ladder increase in the prevalence of ESI as the direction changed from upward to lateralward to downward (0.15 ± 0.41, 0.25 ± 0.54, 0.38 ± 0.69 episodes/patient-year, p = 0.03). Multivariable regression analysis revealed the upward exit-site independently associates with both higher frequency of ESBE (OR 5.55, 95% CI 2.23-16.45, p < 0.01) and reduction of prevalence of ESI (OR 0.55, 95%CI 0.27-0.98, p = 0.04). Positive association between the prevalence of symptomatic catheter dislocation and ESI (OR 2.84, 95% CI 1.27-7.82, p = 0.01), and inverse association between EDBE and either prevalence of symptomatic catheter dislocation (OR 0.27, 95% CI 0.11-0.72) or peritonitis (OR 0.48, 95% CI 0.23-0.99) observed.
    CONCLUSIONS: Upward-directed swan-neck catheter exit-site may be the best for both ESBE and prevention of ESI. EDBE may reduce catheter dislocation and peritonitis. Symptomatic catheter dislocation may predict ESI.
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  • 文章类型: Journal Article
    蜜蜂的摇摆舞是一种极其复杂的动物交流形式,是殖民地集体觅食行为的基础。蜜蜂评估他们在舞池上参观过的饲草地点的位置的机制现在已经很好理解,但是很少有研究考虑到舞蹈追随者将这些信息向后转化为飞行矢量。这里,我们探讨了当蜜蜂从同巢伙伴那里学习相同的位置时,通过个体学习觅食位置诱导的基因表达模式是否被反映。我们首先证实,蜜蜂舞者的蘑菇体对学习距离表现出特定的转录组反应,然后表明,大约5%的这些基因也是由在相同觅食部位跟随舞蹈的蜜蜂差异表达的,但从未拜访过他们。当我们通过光学流范式操纵距离感知时,这些基因的一个子集也被差异表达,对学习目标方向的反应也部分反映在舞蹈追随者的大脑中。我们的发现显示了通过这种非凡的通信系统将学习信息从一种动物转移到另一种动物的分子足迹,强调基因组在介导甚至非常短期的行为变化中的动态作用。
    The waggle dances of honeybees are a strikingly complex form of animal communication that underlie the collective foraging behaviour of colonies. The mechanisms by which bees assess the locations of forage sites that they have visited for representation on the dancefloor are now well-understood, but few studies have considered the remarkable backward translation of such information into flight vectors by dance-followers. Here, we explore whether the gene expression patterns that are induced through individual learning about foraging locations are mirrored when bees learn about those same locations from their nest-mates. We first confirmed that the mushroom bodies of honeybee dancers show a specific transcriptomic response to learning about distance, and then showed that approximately 5% of those genes were also differentially expressed by bees that follow dances for the same foraging sites, but had never visited them. A subset of these genes were also differentially expressed when we manipulated distance perception through an optic flow paradigm, and responses to learning about target direction were also in part mirrored in the brains of dance followers. Our findings show a molecular footprint of the transfer of learnt information from one animal to another through this extraordinary communication system, highlighting the dynamic role of the genome in mediating even very short-term behavioural changes.
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  • 文章类型: Journal Article
    对象的位置通常相对于一个或多个地标被记住。物体相对于地标具有一定的方向和距离。当多个地标可用时,来自不同地标的信息被整合。在主流视图中,方向和距离在整合过程中同样有影响。我们提供的证据表明,方向和距离在基于地标的记忆中并不总是同样有影响力。在我们任务的学习阶段,参与者查看了一组布局,每个包括一个目标和两个地标。在测试阶段,参与者试图将每个目标放置在相对于两个地标的正确位置。我们对方向偏差的度量是根据距离而不是仅根据方向来索引目标的放置程度。我们对距离偏差的度量是根据方向而不是仅根据距离来索引目标的放置程度。方向偏差小于距离偏差。结果表明,对于对象相对于地标的位置,方向比记忆中的距离更具影响力。
    An object\'s location is often remembered relative to one or more landmarks. An object has a certain direction and distance relative to a landmark. When multiple landmarks are available the information from the different landmarks is integrated. In the prevailing view direction and distance are equally influential in the integration process. We present evidence that direction and distance are not always equally influential in landmark-based memory. During the study phase of our task, participants viewed a set of layouts, each comprising a target and two landmarks. During the test phase participants attempted to place each target in the correct location relative to the two landmarks. Our measure of direction deviation indexed the degree to which the targets were placed on the basis of distance rather than solely on the basis of direction. Our measure of distance deviation indexed the degree to which the targets were placed on the basis of direction rather than solely on the basis of distance. Direction deviation was smaller than distance deviation. The results suggest that direction is more influential than distance in memory for the locations of objects relative to landmarks.
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  • 文章类型: Journal Article
    注意力可以在有或没有伴随的扫视的情况下转移(即,公开或秘密,分别)。到目前为止,目前还不清楚这些转变在认知上有多昂贵,然而,这种量化对于理解如何以及何时公开或秘密地部署注意力是必要的。在我们的第一个实验中(N=24个成年人),我们用瞳孔测量法表明,公开转移注意力比秘密转移注意力成本更高,可能是因为规划扫视更复杂。我们认为,这些差异成本将,在某种程度上,确定在给定的上下文中注意力是公开还是秘密转移。随后的实验(N=24个成年人)表明,在水平或垂直方向上,相对复杂的倾斜扫视比相对简单的扫视成本更高。这为扫视的基本方向偏差提供了可能的解释。这里提出的成本观点的效用对于进一步理解有效处理和与外部世界互动所涉及的众多决策至关重要。
    Attention can be shifted with or without an accompanying saccade (i.e., overtly or covertly, respectively). Thus far, it is unknown how cognitively costly these shifts are, yet such quantification is necessary to understand how and when attention is deployed overtly or covertly. In our first experiment (N = 24 adults), we used pupillometry to show that shifting attention overtly is more costly than shifting attention covertly, likely because planning saccades is more complex. We pose that these differential costs will, in part, determine whether attention is shifted overtly or covertly in a given context. A subsequent experiment (N = 24 adults) showed that relatively complex oblique saccades are more costly than relatively simple saccades in horizontal or vertical directions. This provides a possible explanation for the cardinal-direction bias of saccades. The utility of a cost perspective as presented here is vital to furthering our understanding of the multitude of decisions involved in processing and interacting with the external world efficiently.
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  • 文章类型: Journal Article
    目的:具有统计学意义的研究结果通常比具有非显著结果的研究更有可能发表。这种现象导致发表偏倚或小研究效应,并可能严重影响系统评价和荟萃分析结论的有效性。小型研究效果通常出现在特定方向,取决于利益的结果是有益的还是有害的,但是传统方法很少考虑这个方向。
    方法:我们建议使用方向性测试来评估潜在的小型研究效果。这些测试建立在基于现有Egger回归测试的单边测试框架上。我们进行了模拟研究,以比较提出的单边回归测试,传统的双边回归检验,以及其他两种竞争方法(贝格的排名测试和修剪填充法)。它们的性能是通过I型错误率和统计能力来衡量的。还使用了三个关于牙周缺陷缺陷测量的真实世界荟萃分析来检查各种方法的性能。
    结果:基于模拟研究,单边测试可能比竞争方法具有高得多的统计能力,尤其是他们的双面对手。它们的I型错误率通常控制得很好。在三个真实世界荟萃分析的案例研究中,通过考虑有利的影响方向,单边测试可以排除关于小型研究效果的潜在假阳性结论.当真正的小研究效果可能存在时,它们在评估小研究效果方面也比传统的双面测试更强大。
    结论:我们建议研究人员将潜在的有利影响方向纳入对小型研究影响的评估。
    Studies with statistically significant results are frequently more likely to be published than those with non-significant results. This phenomenon leads to publication bias or small-study effects and can seriously affect the validity of the conclusion from systematic reviews and meta-analyses. Small-study effects typically appear in a specific direction, depending on whether the outcome of interest is beneficial or harmful, but this direction is rarely taken into account in conventional methods.
    We propose to use directional tests to assess potential small-study effects. The tests are built on a one-sided testing framework based on the existing Egger\'s regression test. We performed simulation studies to compare the proposed one-sided regression tests, conventional two-sided regression tests, as well as two other competitive methods (Begg\'s rank test and the trim-and-fill method). Their performance was measured by type I error rates and statistical power. Three real-world meta-analyses on measurements of infrabony periodontal defects were also used to examine the various methods\' performance.
    Based on simulation studies, the one-sided tests could have considerably higher statistical power than competing methods, particularly their two-sided counterparts. Their type I error rates were generally controlled well. In the case study of the three real-world meta-analyses, by accounting for the favored direction of effects, the one-sided tests could rule out potential false-positive conclusions about small-study effects. They also are more powerful in assessing small-study effects than the conventional two-sided tests when true small-study effects likely exist.
    We recommend researchers incorporate the potential favored direction of effects into the assessment of small-study effects.
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  • 文章类型: Journal Article
    观察者通常根据对象的方向和与参考对象的距离来记住对象的位置。两种参考对象是特别感兴趣的:地标和边界。我们比较了观察者对目标物体与地标和边界的方向和距离的记忆程度。可变错误的模式暗示,在支持目标对象方向的记忆方面,界标比边界更有效。当地标和边界的预测发生冲突时,恒定错误的模式暗示边界在支持目标物体距离的记忆方面比地标更有效。这些结果表明方向信息与地标之间以及距离信息与边界之间的亲和力。他们提出了这样的可能性,而不是在方向和距离误差上崩溃,理论分析应区分界标和边界可靠性评估中的两种误差。
    An observer often remembers an object\'s location on the basis of its direction and distance from reference objects. Two kinds of reference object are of particular interest: landmarks and boundaries. We compared how well observers remembered the direction and distance of target objects from a landmark and a boundary. Patterns of variable error implied that the landmark was more effective than the boundary in supporting memory for target object direction. When the predictions of the landmark and the boundary were placed in conflict, patterns of constant error implied that the boundary was more effective than the landmark in supporting memory for target object distance. These results suggest affinities between direction information and landmarks and between distance information and boundaries. They raise the possibility that, rather than collapsing across direction and distance error, theoretical analyses should distinguish the two kinds of error in assessing the reliability of landmarks and boundaries.
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  • 文章类型: Journal Article
    最近,远程会议和在家工作变得越来越普遍,减少面对面交流的机会。为了促进远程工作人员之间的通信,研究人员集中在虚拟空间技术和空间增强现实技术上。尽管这些技术可以增强协作工作的沉浸感,他们面临着培养身体接触意识的挑战。在这项工作中,我们旨在通过使用气动执行器的触觉刺激来培养存在感。具体来说,我们开发了一种choker型可穿戴设备,该设备可以在脖子上显示各种压力模式;所显示的模式取决于设备必须传达的信息。通过将空气泵送到附接到节流器的多个气动致动器来实现触觉呈现的各种组合。此外,我们进行了涉及不同形状的执行器的实验,以优化触觉呈现。当与智能手机链接时,所提出的设备可以呈现压力模式以指示来电和通知,警告一个正在发短信的人在走路时可能会错过的障碍,并为行人提供方向。此外,该装置可用于广泛的应用,从日常生活中必要的那些到那些增强娱乐领域经验的那些。例如,在舞台表演期间,与歌手的存在或与所听歌曲的节奏或表演者的动作同步的触觉反馈将使用户沉浸在愉快的体验中。
    Recently, remote meetings and work-from-home have become more common, reducing the opportunities for face-to-face communication. To facilitate communication among remote workers, researchers have focused on virtual space technology and spatial augmented reality technology. Although these technologies can enhance immersiveness in collaborative work, they face the challenge of fostering a sense of physical contact. In this work, we aimed to foster a sense of presence through haptic stimulation using pneumatic actuators. Specifically, we developed a choker-type wearable device that presents various pressure patterns around the neck; the pattern presented depends on the message the device must convey. Various combinations of haptic presentation are achieved by pumping air to the multiple pneumatic actuators attached to the choker. In addition, we conducted experiments involving actuators of different shapes to optimize the haptic presentation. When linked with a smartphone, the proposed device can present pressure patterns to indicate incoming calls and notifications, to give warning about an obstacle that one who is texting might miss while walking, and to provide direction to a pedestrian. Furthermore, the device can be used in a wide range of applications, from those necessary in daily living to those that enhance one\'s experience in the realm of entertainment. For example, haptic feedback that synchronizes with the presence of a singer or with the rhythm of a song one listens to or with a performer\'s movements during a stage performance will immerse users in an enjoyable experience.
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