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排序方式： 共有6201条查询结果，搜索用时 15 毫秒
111.
Meng Xia Min Xu Chuan-en Lin Ta Ying Cheng Huamin Qu Xiaojuan Ma 《Computer Graphics Forum》2020,39(3):511-522
Problem-solving dynamics refers to the process of solving a series of problems over time, from which a student's cognitive skills and non-cognitive traits and behaviors can be inferred. For example, we can derive a student's learning curve (an indicator of cognitive skill) from the changes in the difficulty level of problems solved, or derive a student's self-regulation patterns (an example of non-cognitive traits and behaviors) based on the problem-solving frequency over time. Few studies provide an integrated overview of both aspects by unfolding the problem-solving process. In this paper, we present a visual analytics system named SeqDynamics that evaluates students ‘problem-solving dynamics from both cognitive and non-cognitive perspectives. The system visualizes the chronological sequence of learners’ problem-solving behavior through a set of novel visual designs and coordinated contextual views, enabling users to compare and evaluate problem-solving dynamics on multiple scales. We present three scenarios to demonstrate the usefulness of SeqDynamics on a real-world dataset which consists of thousands of problem-solving traces. We also conduct five expert interviews to show that SeqDynamics enhances domain experts’ understanding of learning behavior sequences and assists them in completing evaluation tasks efficiently. 相似文献
112.
Current EU regulation restricts continuously reviewing X-ray images of passenger baggage to 20-min duration as a precautionary measure to prevent performance decrements in airport security officers (screeners). However, this 20-min limit is not based on clear empirical evidence on how well screeners can sustain their performance over time. Our study tested screeners in a 60-min simulated X-ray cabin baggage screening task. One group took 10-min breaks after 20 min of screening; the other group worked without breaks. We found no decrease in performance over 60 min in either group. Breaks did not affect performance, but they did reduce the amount of subjective distress. By varying target prevalence, we found that da with a slope of about 0.6 is a more valid measure of detection performance than d'. Target prevalence caused a criterion shift. Our results provide a basis for conducting field studies of prolonged screening durations, and open the discussion on whether more flexible break policies and work schedules should be considered. 相似文献
113.
Aircraft accident investigation has played a pivotal role in improving the safety of aviation. Advances in recorder technology, specifically Cockpit Voice Recorders (CVRs) and Flight Data Recorders (FDR) have made a huge contribution to the understanding of occurrences for accident investigators. However, even these recorders have limitations such as the evidence they provide about pilots' situation awareness or behaviours. Supplementing audio and data recordings with video has been discussed for many years and whilst there continues to be debate among regulators, operators, manufacturers and pilot unions, the International Civil Aviation Organization (ICAO) has mandated Airborne Image Recorders (AIR) from 2023. The purpose of installing such systems is to provide evidence of crew operational behaviours in terms of both human-human and human-computer interactions (HCI) on the flight deck. Video alone is unlikely to provide sufficient evidence for investigators. This study examines the additional value that eye-tracking technology may provide through the case study of an accident involving an Airbus A330-300 aircraft which experienced a rejected landing. Currently, the investigation of such events, where crew interaction with automation is critical to their situation awareness, relies heavily on interview data. Such data may be unavailable (in the case of serious injury) or unreliable (based on hindsight bias). By integrating eye tracking technology into an AIR, accident investigators will potentially gain a better understanding of pilots’ visual scan patterns across flight deck instrumentation. This has implications for flight deck and procedural design as well as training and simulation. 相似文献
114.
Visual search is one type of common encountered human-computer interaction tasks, but it has less been examined in vibration environments. The aim of this study was to examine the effects of one user characteristic (spatial ability) and two stimulus characteristics (i.e., stimulus size and stimulus density) on visual search performance during single- and double-target tasks in simulated vibration environments. Twenty-four participants attended an experiment where they were instructed to perform single- and double-target visual search tasks with varied levels of stimulus size and stimulus density under static, slight and moderate vibration environments, respectively. Results indicated that the two vibration conditions achieved comparable visual search performance, perceived visual fatigue, and perceived comfort with static condition across task types. Stimuli size and stimulus density yielded significant effects on visual search time in both single- and double-target tasks (p's < 0.001). Participants with high spatial ability were faster than those with low spatial ability in double-target tasks (p = 0.042). Users preferred interface design with medium-to-large stimulus size and low-to-medium stimulus density in visual search. 相似文献
115.
基于VB平台的万能试验机微机测控系统的研制 总被引：3，自引：0，他引：3
阐述了将机械式万能试验机测控系统改造为微机化测控系统的软硬件系统的结构和功能 ,介绍了在Win dows环境下基于VisualBasic 6 .0平台 ,使用动态链接库实现对万能试验机的主要参数应力、应变进行测量 ,并实现测量曲线实时显示、存储与重绘的关键技术。 相似文献
116.
117.
MatrixVB--基于Matlab与VB的计算引擎 总被引：11，自引：0，他引：11
徐军辉 《国外电子测量技术》2002,21(6):32-33
本文介绍利用COM组件MatrixVB来扩展Visual Basic计算功能的开发过程与发布方法。MatrixVB作为一种数学工具有效地将Matlab的强大功能融入到了Visual Basic中。 相似文献
118.
119.
开发工具提供的报表工具实现数据报表存在很多问题 ,故采用功能强大的专业报表编辑工具维护报表的显示格式 ,而让应用程序仅负责产生查询结果 ,这样就可实现应用软件与报表格式的相互独立性。结合工资单报表的实例 ,介绍了格式文件的制作要点和在VisualC 中操纵Excel表格的方法 相似文献
120.
应用串行通讯实现基于DSP的电机驱动系统的监控 总被引：8，自引：0，他引：8
在Ｗｉｎｄｏｗｓ９５下采用Ｖｉｓｕａｌ Ｂａｓｉｃ ６．０,通过串行通信方式实现微机与电机驱动系统ＤＳＰ控制器之间的监控数据实时交换。 相似文献