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On time-memory trade-offs for password hashing schemes 密码哈希算法在时间和内存之间的权衡
Pub Date : 2024-02-29 DOI: 10.3389/fcomp.2024.1368362
Ayşe Nurdan Saran
A password hashing algorithm is a cryptographic method that transforms passwords into a secure and irreversible format. It is used not only for authentication purposes but also for key derivation mechanisms. The primary purpose of password hashing is to enhance the security of user credentials by preventing the exposure of plaintext passwords in the event of a data breach. As a key derivation function, password hashing aims to derive secret keys from a master key, password, or passphrase using a pseudorandom function. This review focuses on the design and analysis of time-memory trade-off (TMTO) attacks on recent password hashing algorithms. This review presents a comprehensive survey of TMTO attacks and recent studies on password hashing for authentication by examining the literature. The study provides valuable insights and strategies for safely navigating transitions, emphasizing the importance of a systematic approach and thorough testing to mitigate risk. The purpose of this paper is to provide guidance to developers and administrators on how to update cryptographic practices in response to evolving security standards and threats.
密码散列算法是一种加密方法,可将密码转换成安全、不可逆的格式。它不仅可用于身份验证,还可用于密钥推导机制。密码散列的主要目的是在数据泄露时防止明文密码泄露,从而提高用户凭证的安全性。作为一种密钥推导功能,密码散列的目的是利用伪随机函数从主密钥、密码或口令推导出秘密密钥。本综述侧重于设计和分析针对最新密码散列算法的时间-内存权衡(TMTO)攻击。本综述通过对文献的研究,全面介绍了 TMTO 攻击和近期关于密码散列认证的研究。这项研究为安全过渡提供了有价值的见解和策略,强调了系统方法和全面测试对降低风险的重要性。本文旨在为开发人员和管理员提供指导,帮助他们了解如何根据不断发展的安全标准和威胁更新加密实践。
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引用次数: 0
A comprehensive framework for quantitative risk assessment of organizational networks using FAIR-modified attack trees 利用 FAIR 修正攻击树进行组织网络定量风险评估的综合框架
Pub Date : 2024-02-29 DOI: 10.3389/fcomp.2024.1304288
Atul Rana, Sachin Gupta, Bhoomi Gupta
Attack trees are a widely used method for threat modeling and analyzing cyber-attacks in organizational networks. Assessing the risk associated with each individual node of an attack tree is crucial for understanding the overall risk of the attack. This article presents a comparative study of different threat modeling methods and risk assessment approaches in organizational networks. The article also presents a novel comprehensive approach for quantifying risk assessment of organizational networks based on attack trees modified according to the factor analysis of information risk (FAIR) approach. Our results demonstrate the effectiveness of the novel approach in capturing the unique characteristics of different assets and their dependencies in an attack tree, leading to quantitative risk assessment.
攻击树是一种广泛应用于组织网络威胁建模和网络攻击分析的方法。评估攻击树中每个节点的相关风险对于了解攻击的整体风险至关重要。本文对组织网络中不同的威胁建模方法和风险评估方法进行了比较研究。文章还介绍了一种基于根据信息风险因子分析(FAIR)方法修改的攻击树来量化组织网络风险评估的新型综合方法。我们的研究结果表明,这种新方法能有效捕捉攻击树中不同资产的独特特征及其依赖关系,从而进行量化风险评估。
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引用次数: 0
Where to mount the IMU? Validation of joint angle kinematics and sensor selection for activities of daily living 在哪里安装 IMU?验证关节角度运动学和日常生活活动传感器的选择
Pub Date : 2024-02-29 DOI: 10.3389/fcomp.2024.1347424
Lena Uhlenberg, Oliver Amft
We validate the OpenSense framework for IMU-based joint angle estimation and furthermore analyze the framework's ability for sensor selection and optimal positioning during activities of daily living (ADL). Personalized musculoskeletal models were created from anthropometric data of 19 participants. Quaternion coordinates were derived from measured IMU data and served as input to the simulation framework. Six ADLs, involving upper and lower limbs were measured and a total of 26 angles analyzed. We compared the joint kinematics of IMU-based simulations with those of optical marker-based simulations for most important angles per ADL. Additionally, we analyze the influence of sensor count on estimation performance and deviations between joint angles, and derive the best sensor combinations. We report differences in functional range of motion (fRoMD) estimation performance. Results for IMU-based simulations showed MAD, RMSE, and fRoMD of 4.8°, 6.6°, 7.2° for lower limbs and for lower limbs and 9.2°, 11.4°, 13.8° for upper limbs depending on the ADL. Overall, sagittal plane movements (flexion/extension) showed lower median MAD, RMSE, and fRoMD compared to transversal and frontal plane movements (rotations, adduction/abduction). Analysis of sensor selection showed that after three sensors for the lower limbs and four sensors for the complex shoulder joint, the estimation error decreased only marginally. Global optimum (lowest RMSE) was obtained for five to eight sensors depending on the joint angle across all ADLs. The sensor combinations with the minimum count were a subset of the most frequent sensor combinations within a narrowed search space of the 5% lowest error range across all ADLs and participants. Smallest errors were on average < 2° over all joint angles. Our results showed that the open-source OpenSense framework not only serves as a valid tool for realistic representation of joint kinematics and fRoM, but also yields valid results for IMU sensor selection for a comprehensive set of ADLs involving upper and lower limbs. The results can help researchers to determine appropriate sensor positions and sensor configurations without the need for detailed biomechanical knowledge.
我们验证了基于 IMU 的关节角度估算 OpenSense 框架,并进一步分析了该框架在日常生活(ADL)活动中选择传感器和优化定位的能力。根据 19 名参与者的人体测量数据创建了个性化肌肉骨骼模型。四元数坐标来自测量的 IMU 数据,并作为模拟框架的输入。我们测量了涉及上肢和下肢的六个 ADL,并分析了总共 26 个角度。我们比较了基于 IMU 的模拟与基于光学标记的模拟在每个 ADL 最重要角度的关节运动学。此外,我们还分析了传感器数量对估计性能和关节角度偏差的影响,并得出了最佳传感器组合。我们报告了功能运动范围(fRoMD)估计性能的差异。基于 IMU 的模拟结果显示,根据 ADL 的不同,下肢的 MAD、RMSE 和 fRoMD 分别为 4.8°、6.6°、7.2°,上肢的 MAD、RMSE 和 fRoMD 分别为 9.2°、11.4°、13.8°。总体而言,与横向和额面运动(旋转、内收/外展)相比,矢状面运动(屈/伸)的中位数MAD、RMSE和fRoMD较低。对传感器选择的分析表明,在下肢使用三个传感器和复杂肩关节使用四个传感器后,估计误差仅略有减少。根据所有 ADL 关节角度的不同,5 至 8 个传感器可获得总体最佳值(均方根误差最小)。计数最小的传感器组合是在所有 ADL 和参与者中误差最小的 5%搜索空间内最常见传感器组合的子集。在所有关节角度中,最小误差平均小于 2°。我们的研究结果表明,开源的 OpenSense 框架不仅是真实呈现关节运动学和 fRoM 的有效工具,还能为涉及上肢和下肢的各种 ADL 提供有效的 IMU 传感器选择结果。这些结果可以帮助研究人员确定合适的传感器位置和传感器配置,而无需详细的生物力学知识。
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引用次数: 0
Automatic labeling of fish species using deep learning across different classification strategies 利用深度学习跨不同分类策略自动标注鱼类物种
Pub Date : 2024-02-29 DOI: 10.3389/fcomp.2024.1326452
Javier Jareño, G. Bárcena-González, J. Castro-Gutiérrez, R. Cabrera-Castro, Pedro L. Galindo
Convolutional neural networks (CNNs) have revolutionized image recognition. Their ability to identify complex patterns, combined with learning transfer techniques, has proven effective in multiple fields, such as image classification. In this article we propose to apply a two-step methodology for image classification tasks. First, apply transfer learning with the desired dataset, and subsequently, in a second stage, replace the classification layers by other alternative classification models. The whole methodology has been tested on a dataset collected at Conil de la Frontera fish market, in Southwest Spain, including 19 different fish species to be classified for fish auction market. The study was conducted in five steps: (i) collecting and preprocessing images included in the dataset, (ii) using transfer learning from 4 well-known CNNs (ResNet152V2, VGG16, EfficientNetV2L and Xception) for image classification to get initial models, (iii) apply fine-tuning to obtain final CNN models, (iv) substitute classification layer with 21 different classifiers obtaining multiple F1-scores for different training-test splits of the dataset for each model, and (v) apply post-hoc statistical analysis to compare their performances in terms of accuracy. Results indicate that combining the feature extraction capabilities of CNNs with other supervised classification algorithms, such as Support Vector Machines or Linear Discriminant Analysis is a simple and effective way to increase model performance.
卷积神经网络(CNN)给图像识别带来了革命性的变化。它们识别复杂模式的能力与学习转移技术相结合,已被证明在多个领域(如图像分类)行之有效。在本文中,我们建议将两步法应用于图像分类任务。首先,在所需数据集上应用迁移学习,然后在第二阶段用其他替代分类模型替换分类层。整个方法已在西班牙西南部科尼尔德拉弗龙特拉鱼市收集的数据集上进行了测试,其中包括鱼类拍卖市场需要分类的 19 种不同鱼类。研究分五个步骤进行:(i) 收集和预处理数据集中的图像;(ii) 使用 4 个著名 CNN(ResNet152V2、VGG16、EfficientNetV2L 和 Xception)的迁移学习进行图像分类,以获得初始模型;(iii) 进行微调,以获得最终 CNN 模型;(iv) 使用 21 个不同的分类器替代分类层,以获得每个模型在数据集的不同训练-测试部分的多个 F1 分数;(v) 进行事后统计分析,以比较它们在准确性方面的表现。结果表明,将 CNN 的特征提取功能与支持向量机或线性判别分析等其他监督分类算法相结合,是提高模型性能的一种简单而有效的方法。
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引用次数: 0
Editorial: Entertainment computing and persuasive technologies 社论:娱乐计算与说服技术
Pub Date : 2024-02-27 DOI: 10.3389/fcomp.2024.1369550
Teresa Romão, Sergi Bermúdez i Badia
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引用次数: 0
Challenges in moderating disruptive player behavior in online competitive action games 调节在线竞技动作游戏中玩家破坏性行为的挑战
Pub Date : 2024-02-23 DOI: 10.3389/fcomp.2024.1283735
Rafal Kocielnik, Zhuofang Li, Claudia Kann, D. Sambrano, Jacob Morrier, Mitchell Linegar, Carly Taylor, Min Kim, Nabiha Naqvie, Feri Soltani, Arman Dehpanah, Grant Cahill, Animashree Anandkumar, R. M. Alvarez
Online competitive action games are a very popular form of entertainment. While most are respectfully enjoyed by millions of players, a small group of players engages in disruptive behavior, such as cheating and hate speech. Identifying and subsequently moderating these toxic players is a challenging task. Previous research has only studied specific aspects of this problem using curated data and with limited access to real-world moderation practices. In contrast, our work offers a unique and holistic view of the universal challenges of moderating disruptive behavior in online systems. We combine an analysis of a large dataset from a popular online competitive first-person action title (Call of Duty®: Modern Warfare®II) with insights from stakeholders involved in moderation. We identify six universal challenges related to handling disruptive behaviors in such games. We discuss challenges omitted by prior work, such as handling high-volume imbalanced data or ensuring the comfort of human moderators. We also offer a discussion of possible technical, design, and policy approaches to mitigating these challenges.
在线竞技动作游戏是一种非常流行的娱乐形式。虽然大多数游戏都受到数百万玩家的喜爱,但也有一小部分玩家从事作弊和仇恨言论等破坏性行为。识别并随后控制这些有毒玩家是一项具有挑战性的任务。以往的研究仅使用经过整理的数据对这一问题的特定方面进行了研究,对现实世界中的管理实践了解有限。与此相反,我们的工作提供了一个独特而全面的视角,来审视在网络系统中管理破坏性行为所面临的普遍挑战。我们将对一款广受欢迎的在线第一人称动作竞技游戏(《使命召唤®:现代战争®II》)的大型数据集的分析与参与管理的利益相关者的见解相结合。我们发现了与处理此类游戏中的破坏性行为有关的六个普遍挑战。我们讨论了以往工作中忽略的挑战,如处理大量不平衡数据或确保人类版主的舒适度。我们还讨论了减轻这些挑战的可能的技术、设计和政策方法。
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引用次数: 0
HRVEST: a novel data solution for using wearable smart technology to measure physiologic stress variables during a randomized clinical trial HRVEST:在随机临床试验中使用可穿戴智能技术测量生理压力变量的新型数据解决方案
Pub Date : 2024-02-22 DOI: 10.3389/fcomp.2024.1343139
Jeffrey N. Gerwin, Gustavo de Oliveira Almeida, Michael W. Boyce, Melissa Joseph, Ambrose H. Wong, Winslow Burleson, Leigh V. Evans
The purpose of this study was to address the logistical and data challenges of using wearable technologies in the context of a clinical trial to measure heart rate variability (HRV) as a marker of physiologic stress in emergency healthcare providers during the COVID-19 pandemic. When using these wearable smart garments, the dilemma is two-fold: (1) the volume of raw physiological data produced is enormous and is recorded in formats not easily portable in standard analytic software, and (2) the commensurate data analysis often requires proprietary software. Our team iteratively developed a novel algorithm called HRVEST that can successfully process enormous volumes of physiologic raw data generated by wearable smart garments and meet the specific needs of HRV analyses. HRVEST is a noise-filtering and data-processing algorithm that allows the precise measurements of heart rate variability (HRV) of clinicians working in an Emergency Department (ED). HRVEST automatically processed the biometric data derived from 413 electrocardiogram (ECG) recordings in just over 15 min. Furthermore, throughout this study, we identified unique challenges of working with these technologies and proposed solutions that may facilitate future use in broader contexts. With HRVEST, using wearable smart garments to monitor HRV over long periods of time becomes logistically and feasibly viable for future studies. We also see the potential for real-time feedback to prophylactically reduce emergency physician stress, like informing optimal break-taking or short meditation sessions to lower heart rate. This could improve emotional wellbeing and, subsequently, clinical decision-making and patient outcomes.
本研究的目的是解决在一项临床试验中使用可穿戴技术测量心率变异性(HRV)作为 COVID-19 大流行期间紧急医疗服务提供者生理压力标志物所面临的后勤和数据挑战。在使用这些可穿戴智能服装时,面临着两方面的困境:(1)产生的原始生理数据量巨大,而且记录的格式不易被标准分析软件移植;(2)相应的数据分析通常需要专用软件。我们的团队反复开发了一种名为 HRVEST 的新型算法,它能成功处理可穿戴智能服装产生的大量原始生理数据,并满足心率变异分析的特定需求。HRVEST 是一种噪声过滤和数据处理算法,可精确测量急诊科(ED)临床医生的心率变异性(HRV)。HRVEST 可在 15 分钟内自动处理从 413 次心电图(ECG)记录中获得的生物计量数据。此外,在整个研究过程中,我们还发现了使用这些技术所面临的独特挑战,并提出了解决方案,以促进未来在更广泛的环境中使用这些技术。有了 HRVEST,使用可穿戴智能服装来长时间监测心率变异在未来的研究中将变得更加合理可行。我们还看到了实时反馈的潜力,可以预防性地减轻急诊医生的压力,比如告知最佳休息时间或短期冥想以降低心率。这可以改善情绪,进而改善临床决策和患者治疗效果。
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引用次数: 0
“The sleep data looks way better than I feel.” An autoethnographic account and diffractive reading of sleep-tracking "睡眠数据看起来比我感觉好得多"。对睡眠追踪的自述和衍射解读
Pub Date : 2024-02-21 DOI: 10.3389/fcomp.2024.1258289
A. N. Nagele, Julian Hough
Sleep-tracking products are promising their users an improvement to their sleep by focusing on behavior change but often neglecting the contextual and individual factors contributing to sleep quality and quantity. Making good sleep for productive scheduling a personal responsibility does not necessarily lead to better sleep and may cause stress and anxiety. In an autoethnographic study, the first author of this paper tracked her sleep for one month using a diary, body maps and an Oura ring and compared her subjectively felt sleep experience with the data produced by the Oura app. A thematic analysis of the data resulted in four themes describing the relationship between the user-researcher and her wearable sleep-tracker: (1) good sleep scores are motivating, (2) experience that matches the data leads to sense-making, (3) contradictory information from the app leads to frustration, and (4) the sleep-tracker competes with other social agents. A diffractive reading of the data and research process, following Karen Barad's methodology, resulted in a discussion of how data passes through the analog and digital apparatus and what contextual factors are left out but still significantly impact sleep quality and quantity. We add to a canon of sleep research recommending a move away from representing sleep in terms of comparison and competition, uncoupling it from neoliberal capitalistic productivity and self-improvement narratives which are often key contributing factors to bad sleep in the first place.
睡眠跟踪产品向用户承诺改善睡眠,但往往忽视了影响睡眠质量和数量的环境因素和个人因素。将良好的睡眠作为提高工作效率的个人责任并不一定会带来更好的睡眠,反而可能会造成压力和焦虑。在一项自述式研究中,本文第一作者使用日记、身体地图和 Oura 戒指对自己的睡眠情况进行了为期一个月的跟踪,并将自己主观感受到的睡眠体验与 Oura 应用程序生成的数据进行了比较。通过对数据进行主题分析,得出了描述用户研究者与可穿戴睡眠追踪器之间关系的四个主题:(1) 好的睡眠分数是动力,(2) 与数据相匹配的体验导致感性认识,(3) 来自应用程序的矛盾信息导致挫败感,(4) 睡眠追踪器与其他社会代理竞争。按照凯伦-巴拉德(Karen Barad)的方法论,我们对数据和研究过程进行了衍射式解读,讨论了数据如何通过模拟和数字设备,以及哪些背景因素被忽略但仍对睡眠质量和数量产生重大影响。我们为睡眠研究的经典之作添砖加瓦,建议摒弃用比较和竞争来描述睡眠的做法,将其与新自由主义资本主义生产力和自我完善叙事分离开来,这些叙事往往是导致睡眠质量低下的关键因素。
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引用次数: 0
“Below 58 BPM,” involving real-time monitoring and self-medication practices in music performance through IoT technology "低于 58 BPM",涉及通过物联网技术对音乐表演进行实时监测和自我治疗的做法
Pub Date : 2024-02-21 DOI: 10.3389/fcomp.2024.1187933
Nicolo Merendino, Antonio Rodà, Raul Masu
The project presented in this paper illustrates the design process for the development of an IoT system that monitors a specific bio-metric parameter (heart rate) in real time and provides feedback for an opera singer, as well as adding effects that manipulate the sounds emitted by the body during a self-healing practice. This allows the singer to rest and alternate opera singing techniques (which is very demanding) with other less demanding singing techniques and even a self-healing session in case of necessity during a performance. The case study presented in this paper has been developed with and for Eleonora Amianto, an opera singer who suffered from a carotid aneurysm. We performed an idiographic design process, closely collaborating with Eleonora, and developed a wearable IoT that suited her health and artistic needs. In the design of the system, we explore the intersection between self-healthcare and performative arts, focusing on the use of an Internet of Musical Things (IoMusT) system to implement medical prevention and treatment practices in an art performance. The system is developed using open-source tools, allowing for easy replication and improvement, as well as reducing risks of obsolescence and costs of updating. We complement a formal evaluation session with field notes collected during the design phase. We could observe a positive effect of the system on Eleonora's practice and its potential applications within different performative scenarios.
本文介绍的项目说明了开发物联网系统的设计过程,该系统可实时监测特定的生物测量参数(心率),并为歌剧演唱者提供反馈,还可在自我修复练习中添加操纵身体发出声音的效果。这样,歌剧演唱者就可以休息,并交替使用歌剧演唱技巧(要求很高)和其他要求较低的演唱技巧,甚至在演出期间必要时进行自我修复。本文介绍的案例研究是与患有颈动脉瘤的歌剧演唱家 Eleonora Amianto 共同开发的。我们与 Eleonora 密切协作,开展了一个特异性设计过程,开发出了适合她的健康和艺术需求的可穿戴物联网。在该系统的设计过程中,我们探索了自我保健与表演艺术之间的交叉点,重点是如何利用音乐物联网(IoMusT)系统在艺术表演中实施医疗预防和治疗。该系统使用开源工具开发,便于复制和改进,并降低了过时的风险和更新成本。我们用在设计阶段收集到的实地记录对正式评估会议进行了补充。我们可以观察到该系统对埃莉奥诺拉的实践产生了积极影响,以及在不同表演场景中的潜在应用。
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引用次数: 0
Design and assessment of a virtual reality learning environment for firefighters 为消防员设计和评估虚拟现实学习环境
Pub Date : 2024-02-20 DOI: 10.3389/fcomp.2024.1274828
S. G. Wheeler, S. Hoermann, S. Lukosch, Robert W. Lindeman
The use of virtual reality (VR) in firefighter training is promising because it provides cost-effective, safe environments that arouse similar behavioral responses to real-life scenarios. However, the pedagogical potential of VR and its impact on learning outcomes compared to traditional methods is currently an under-explored area. This research investigates how well VR can support learning compared to traditional methods in the context of training firefighters in combating vegetation fires. A VR learning environment was developed, informed by a “design for learning” framework providing a pedagogical underpinning. A between-subjects experiment was conducted with 40 participants to measure the knowledge transfer of the VR learning environment against the official textbook. In addition, VR's theorized learning benefits of intrinsic motivation, situational interest, and self-efficacy were compared with textbook-based learning. Lastly, the design quality of the learning environment was assessed based on its learning and user experience. We employed a primarily quantitative approach to data collection and analysis, using a combination of knowledge test results and questionnaires, with supporting qualitative data from semi-structured interviews and observation notes to answer our hypotheses. The results found a significant difference between the knowledge transfer of both conditions, with textbook-based learning more effectively transferring factual and conceptual knowledge than VR. No significant difference was found in reported self-efficacy between the two conditions but was found in reported levels of intrinsic motivation and situational interest, which were higher in the VR condition. The design was found to have facilitated a good user and learning experience, assessed via questionnaire responses. During interviews, VR participants reported high levels of satisfaction with the experience, praising the hands-on learning approach and interactivity, while reporting frustration with the lack of knowledge reinforcement and initial difficulties with the controls. A key finding was that presence was found to be negatively associated with knowledge transfer, which we theorize to be caused by the novelty of the realistic VR environment distracting participants from the more familiar lesson content. This research contributes to the body of work related to knowledge transfer within VR in this domain while highlighting key pedagogical and design considerations that can be used to inform future design implementations.
在消防员培训中使用虚拟现实技术(VR)很有前景,因为它能提供成本效益高、安全的环境,引起与真实场景类似的行为反应。然而,与传统方法相比,VR 的教学潜力及其对学习成果的影响目前仍是一个探索不足的领域。本研究调查了在培训消防员扑灭植被火灾的背景下,与传统方法相比,VR 对学习的支持程度。以 "为学习而设计 "的框架为教学基础,开发了一个 VR 学习环境。对 40 名参与者进行了主体间实验,以衡量 VR 学习环境与官方教科书的知识传授效果。此外,还将 VR 的内在动机、情境兴趣和自我效能等理论学习优势与基于教科书的学习进行了比较。最后,我们根据学习和用户体验评估了学习环境的设计质量。我们主要采用定量方法来收集和分析数据,将知识测试结果和问卷调查结合起来,并通过半结构式访谈和观察记录来支持定性数据,以回答我们的假设。结果发现,两种条件下的知识传授存在显著差异,基于课本的学习比虚拟现实技术更有效地传授事实和概念知识。在报告的自我效能感方面,两种条件没有发现明显差异,但在报告的内在动机和情境兴趣水平方面,VR 条件下的内在动机和情境兴趣水平更高。通过问卷调查,发现该设计为用户提供了良好的学习体验。在访谈中,VR 参与者对体验的满意度很高,对动手学习方法和互动性大加赞赏,同时也对缺乏知识强化和最初的控制困难表示沮丧。一个重要发现是,存在感与知识转移呈负相关,我们推测这是由于逼真的 VR 环境的新奇感分散了参与者对更熟悉的课程内容的注意力。这项研究为这一领域的 VR 知识转移相关工作做出了贡献,同时强调了关键的教学和设计注意事项,可用于指导未来的设计实施。
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引用次数: 0
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