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Guest editorial - Parallel and distributed computing and applications 客座编辑-并行和分布式计算和应用程序
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis230100ixs
Hong Shen, Hui Tian, Yingpeng Sang
nema
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引用次数: 0
Complete formal verification of the PSTM transaction Scheduler 完成对PSTM事务调度程序的正式验证
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis210908058p
M. Popovic, M. Popovic, B. Kordic, Huibiao Zhu
State of the art formal verification is based on formal methods and its goal is proving given correctness properties. For example, a PSTM scheduler was modeled in CSP in order to prove deadlock-freeness and starvation-freeness. However, as this paper shows, using solely formal methods is not sufficient. Therefore, in this paper we propose a complete formal verification of trustworthy software, which jointly uses formal verification and formal model testing. As an example, we first test the previous CSP model of PSTM transaction scheduler by comparing the model checker PAT results with the manually derived expected results, for the given test workloads. Next, according to the results of this testing, we correct and extend the CSP model. Finally, using PAT results for the new CSP model, we analyze the performance of the PSTM online transaction scheduling algorithms from the perspective of the relative speedup.
最先进的形式化验证基于形式化方法,其目标是证明给定的正确性属性。例如,为了证明无死锁和无饥饿,在CSP中建模了一个PSTM调度器。然而,正如本文所示,仅仅使用形式化方法是不够的。因此,本文提出了一种完整的可信赖软件的形式化验证方法,该方法将形式化验证与形式化模型测试相结合。作为一个例子,对于给定的测试工作负载,我们首先通过比较模型检查器PAT结果与手动导出的预期结果来测试PSTM事务调度器的先前CSP模型。接下来,根据本次测试的结果,对CSP模型进行了修正和扩展。最后,利用新CSP模型的PAT结果,从相对加速的角度分析了PSTM在线事务调度算法的性能。
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引用次数: 0
Matching business process behavior with encoding techniques via meta-learning: An anomaly detection study 通过元学习将业务流程行为与编码技术匹配:异常检测研究
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis220110005t
G. Tavares, Sylvio Barbon Junior
Recording anomalous traces in business processes diminishes an event log?s quality. The abnormalities may represent bad execution, security issues, or deviant behavior. Focusing on mitigating this phenomenon, organizations spend efforts to detect anomalous traces in their business processes to save resources and improve process execution. However, in many real-world environments, reference models are unavailable, requiring expert assistance and increasing costs. The con15 siderable number of techniques and reduced availability of experts pose an additional challenge for particular scenarios. In this work, we combine the representational power of encoding with a Meta-learning strategy to enhance the detection of anomalous traces in event logs towards fitting the best discriminative capability be tween common and irregular traces. Our approach creates an event log profile and recommends the most suitable encoding technique to increase the anomaly detetion performance. We used eight encoding techniques from different families, 80 log descriptors, 168 event logs, and six anomaly types for experiments. Results indicate that event log characteristics influence the representational capability of encodings. Moreover, we investigate the process behavior?s influence for choosing the suitable encoding technique, demonstrating that traditional process mining analysis can be leveraged when matched with intelligent decision support approaches.
在业务流程中记录异常跟踪会减少事件日志?年代质量。异常可能表示执行不良、安全问题或异常行为。为了减轻这种现象,组织花费精力检测业务流程中的异常痕迹,以节省资源并改进流程执行。然而,在许多现实环境中,参考模型是不可用的,这需要专家的帮助并增加成本。技术数量之多和专家可用性的减少对特定情况构成了额外的挑战。在这项工作中,我们将编码的表征能力与元学习策略相结合,以增强对事件日志中异常痕迹的检测,以拟合常见和不规则痕迹之间的最佳判别能力。我们的方法创建一个事件日志配置文件,并推荐最合适的编码技术来提高异常检测性能。我们使用了来自不同家族的8种编码技术、80个日志描述符、168个事件日志和6种异常类型进行实验。结果表明,事件日志特征影响编码的表示能力。此外,我们还调查了过程行为。S对选择合适的编码技术的影响,表明当与智能决策支持方法匹配时,传统的过程挖掘分析可以被利用。
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引用次数: 0
Detecting and analyzing fine-grained user roles in social media? 检测和分析社交媒体中的细粒度用户角色?
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis220110006k
J. Kastner, Peter M. Fischer
While identifying specific user roles in social media -in particular bots or spammers- has seen significant progress, generic and all-encompassing user role classification remains elusive on the large data sets of today?s social media. Yet, such broad classifications enable a deeper understanding of user interactions and pave the way for longitudinal studies, capturing the evolution of users such as the rise of influencers. Studies of generic roles have been performed predominantly in a small scale, establishing fundamental role definitions, but relying mostly on ad-hoc, data set-dependent rules that need to be carefully hand-tuned. We build on those studies and provide a largely automated, scalable detection of a wide range of roles. Our approach clusters users hierarchically on salient, complementary features such as their actions, their ability to trigger reactions and their network positions. To associate these clusters with roles, we use supervised classifiers: trained on human experts on completely new media, but transferable on related data sets. Furthermore, we employ the combination of samples in order to improve scalability and allow probabilistic assignments of user roles. Our evaluation on Twitter indicates that a) stable and reliable detection of a wide range of roles is possible b) the labeling transfers well as long as the fundamental properties don?t strongly change between data sets and c) the approaches scale well with little need for human intervention.
虽然识别社交媒体中的特定用户角色(特别是机器人或垃圾邮件发送者)已经取得了重大进展,但在今天的大型数据集中,通用和全面的用户角色分类仍然难以捉摸。美国的社交媒体。然而,这种广泛的分类可以更深入地理解用户交互,并为纵向研究铺平道路,捕捉用户的演变,如影响者的崛起。对通用角色的研究主要是在小范围内进行的,建立了基本的角色定义,但主要依赖于需要仔细手动调整的特定的、数据集相关的规则。我们建立在这些研究的基础上,并提供了一个很大程度上自动化的、可扩展的广泛角色检测。我们的方法根据显著的、互补的特征,如他们的行为、他们触发反应的能力和他们的网络位置,对用户进行分层聚类。为了将这些集群与角色关联起来,我们使用监督分类器:在全新媒体上训练人类专家,但在相关数据集上可转移。此外,我们采用样本组合来提高可伸缩性并允许用户角色的概率分配。我们在Twitter上的评估表明,a)稳定可靠地检测广泛的角色是可能的;b)只要基本属性不变,标签就会转移。T在数据集之间变化很大,c)方法的可扩展性很好,几乎不需要人为干预。
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引用次数: 0
Point of interest coverage with distributed multi-unmanned aerial vehicles on dynamic environment 动态环境下分布式多无人机兴趣点覆盖
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis221222037a
Fatih Aydemir, Aydın Çetin
Mobile agents, which learn to optimize a task in real time, can adapt to dynamic environments and find the optimum locations with the navigation mechanism that includes a motion model. In this study, it is aimed to effectively cover points of interest (PoI) in a dynamic environment by modeling a group of unmanned aerial vehicles (UAVs) on the basis of a learning multi-agent system. Agents create an abstract rectangular plane containing the area to be covered, and then decompose the area into grids. An agent learns to locate on a center of grid that are closest to it, which has the largest number of PoIs to plan its path. This planning helps to achieve a high fairness index by reducing the number of common PoIs covered. The proposed method has been tested in a simulation environment and the results are presented by comparing with similar studies. The results show that the proposed method outperforms existing similar studies and is suitable for area coverage applications.
移动智能体能够实时学习优化任务,能够适应动态环境,并通过包含运动模型的导航机制找到最优位置。在本研究中,通过在学习多智能体系统的基础上对一组无人机(uav)建模,旨在有效地覆盖动态环境中的兴趣点(PoI)。代理创建一个包含要覆盖的区域的抽象矩形平面,然后将该区域分解为网格。智能体学习定位在离它最近的网格中心,这个网格中心有最多的点来规划它的路径。这种规划通过减少所涵盖的公共poi的数量来帮助实现较高的公平性指数。该方法已在仿真环境中进行了测试,并与同类研究结果进行了比较。结果表明,该方法优于现有的同类研究,适用于区域覆盖应用。
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引用次数: 0
Logical dependencies: Extraction from the versioning system and usage in key classes detection 逻辑依赖:从版本控制系统中提取,并在关键类检测中使用
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis220518025s
A. Stana, Ioana Sora
The version control system of every software product can provide important information about how the system is connected. In this study, we first propose a language-independent method to collect and filter dependencies from the version control, and second, we use the results obtained in the first step to identify key classes from three software systems. To identify the key classes, we are using the dependencies extracted from the version control system together with dependencies from the source code, and also separate. Based on the results obtained we can say that compared with the results obtained by using only dependencies extracted from code, the mix between both types of dependencies provides small improvements. And, by using only dependencies from the version control system, we obtained results that did not surpass the results previously mentioned, but are still acceptable. We still consider this an important result because this might open an important opportunity for software systems that use dynamically typed languages such as JavaScript, Objective-C, Python, and Ruby, or systems that use multiple languages. These types of systems, for which the code dependencies are harder to obtain, can use the dependencies extracted from the version control to gain better knowledge about the system.
每个软件产品的版本控制系统都可以提供有关系统如何连接的重要信息。在本研究中,我们首先提出了一种独立于语言的方法来收集和过滤版本控制中的依赖关系,其次,我们使用在第一步中获得的结果来识别三个软件系统中的关键类。为了识别关键类,我们将使用从版本控制系统中提取的依赖关系,以及从源代码中提取的依赖关系。根据所获得的结果,我们可以说,与仅使用从代码中提取的依赖项所获得的结果相比,两种依赖项的混合提供了小的改进。并且,通过仅使用来自版本控制系统的依赖项,我们获得的结果没有超过前面提到的结果,但仍然是可以接受的。我们仍然认为这是一个重要的结果,因为这可能为使用动态类型语言(如JavaScript、Objective-C、Python和Ruby)的软件系统或使用多种语言的系统打开一个重要的机会。这些类型的系统,其代码依赖关系很难获得,可以使用从版本控制中提取的依赖关系来获得关于系统的更好的知识。
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引用次数: 0
Guest editorial - Engineering of computer based systems 客座编辑-基于计算机系统的工程
IF 1.4 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis230100vd
Miodrag Djukic, M. Popovic
nema
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引用次数: 0
Digital remote work influencing public administration employees satisfaction in public health complex contexts 数字远程工作影响公共卫生复杂背景下公共行政员工满意度
4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis230110060s
Maria Sousa, Ana Mendes, Dora Almeida, Álvaro Rocha
The purpose of this study is to describe and analyze whether digital remote work in times of Covid-19 is influencing the satisfaction of Public Administration employees. Based on the objective of this study, an online survey was conducted in the Portuguese Public Administration, for a sample of 70 individuals, working at home due to the situation of Public Health caused by the Coronavirus. Digital remote work is being applied massively worldwide and is a specific form of work organization supported by information and knowledge. Digital remote workers carry out their activities at home and using digital technologies, depending on the nature of the tasks and work situations. To understand the satisfaction of Public Administration employees, an empirical study was carried out, supported by data collection through an online survey. The main conclusions were that despite the constraints (resistance of top management, organizational culture, autonomy, and flexibility of workers, among others) that existed before the health and socioeconomic crisis caused by the Coronavirus pandemic, digital remote work is a given in the life of organizations, public or private, and of workers with reflection at various levels in society and particularly in the professional fulfillment and satisfaction of employees. According to the analysis carried out on the data collected to support the conclusions of this study, the degree of satisfaction of Public Administration employees is influenced in different ways by the influencing factors studied: autonomy at work, conditions at work, and income. However, regarding the factor of quality of life at work, this link has not been established. Thus, it was possible to conclude that satisfaction increases positively and strongly with autonomy at work. Technological specialization and productivity still have a positive influence, but with low intensity contribute to the satisfaction of AP employees. Working conditions also negatively influence satisfaction, although at an average intensity. However, the average degree of job satisfaction varies according to the different age groups, with employees aged 35 or more having a higher satisfaction average than employees whose ages vary between 34 and the beginning of their working lives.
本研究的目的是描述和分析Covid-19时期的数字远程工作是否影响公共行政员工的满意度。基于本研究的目的,在葡萄牙公共行政部门进行了一项在线调查,样本为70人,由于冠状病毒引起的公共卫生状况而在家工作。数字远程工作正在世界范围内得到广泛应用,是一种由信息和知识支持的特殊工作组织形式。数字远程工作者根据任务和工作情况的性质,在家中使用数字技术开展活动。为了了解公共行政员工的满意度,本研究以实证研究为基础,通过在线调查收集数据。主要结论是,尽管在冠状病毒大流行引起的健康和社会经济危机之前就存在制约因素(高层管理人员的阻力、组织文化、自主权和工人的灵活性等),但数字远程工作在公共或私人组织和工人的生活中是一个给定的,反映了社会的各个层面,特别是在员工的职业实现和满意度方面。根据为支持本研究结论而收集的数据进行的分析,公共行政员工的满意度受到研究的影响因素:工作自主性、工作条件和收入以不同的方式影响。然而,关于工作生活质量的因素,这种联系尚未建立。因此,我们可以得出这样的结论:工作中的自主性会积极而强烈地增加满意度。技术专业化和生产率对AP员工满意度仍有正向影响,但对员工满意度的贡献强度较低。工作条件也会对满意度产生负面影响,尽管强度一般。然而,工作满意度的平均程度因不同年龄组而异,35岁或以上的员工比年龄在34岁至工作生涯开始之间的员工平均满意度更高。
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引用次数: 0
Evaluation of deep learning techniques for plant disease detection 植物病害检测的深度学习技术评价
4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis221222073m
C. Marco-Detchart, J.A. Rincon, C. Carrascosa, V. Julian
In recent years, several proposals have been based on Artificial Intelligence techniques for automatically detecting the presence of pests and diseases in crops from images usually taken with a camera. By training with pictures of affected crops and healthy crops, artificial intelligence techniques learn to distinguish one from the other. Furthermore, in the long term, it is intended that the tools developed from such approaches will allow the automation and increased frequency of plant analysis, thus increasing the possibility of determining and predicting crop health and potential biotic risks. However, the great diversity of proposed solutions leads us to the need to study them, present possible situations for their improvement, such as image preprocessing, and analyse the robustness of the proposals examined against more realistic pictures than those existing in the datasets typically used. Taking all this into account, this paper embarks on a comprehensive exploration of various AI techniques leveraging leaf images for the autonomous detection of plant diseases. By fostering a deeper understanding of the strengths and limitations of these methodologies, this research contributes to the vanguard of agricultural disease detection, propelling innovation, and fostering the maturation of AI-driven solutions in this critical domain.
近年来,人们提出了一些基于人工智能技术的建议,这些技术可以从通常用相机拍摄的图像中自动检测农作物中是否存在病虫害。通过使用受损作物和健康作物的图片进行训练,人工智能技术可以学会区分两者。此外,从长远来看,根据这些方法开发的工具将使植物分析自动化并增加频率,从而增加确定和预测作物健康和潜在生物风险的可能性。然而,提出的解决方案的多样性导致我们需要研究它们,提出可能的改进情况,例如图像预处理,并分析针对比通常使用的数据集中存在的更现实的图片检查的建议的鲁棒性。考虑到这一切,本文开始全面探索利用叶片图像自主检测植物病害的各种人工智能技术。通过加深对这些方法的优势和局限性的了解,本研究有助于成为农业疾病检测的先锋,推动创新,并促进人工智能驱动的解决方案在这一关键领域的成熟。
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引用次数: 0
Machine learning based approach for exploring online shopping behavior and preferences with eye tracking 基于机器学习的方法,通过眼动追踪来探索在线购物行为和偏好
4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-01-01 DOI: 10.2298/csis230807077l
Zhenyao Liu, Wei-Chang Yeh, Ke-Yun Lin, Chia-Sheng Lin, Chuan-Yu Chang
In light of advancements in information technology and the widespread impact of the COVID-19 pandemic, consumer behavior has undergone a significant transformation, shifting from traditional in-store shopping to the realm of online retailing. This shift has notably accelerated the growth of the online retail sector. An essential advantage offered by e-commerce lies in its ability to accumulate and analyze user data, encompassing browsing and purchase histories, through its recommendation systems. Nevertheless, prevailing methodologies predominantly rely on historical user data, which often lack the dynamism required to comprehend immediate user responses and emotional states during online interactions. Recognizing the substantial influence of visual stimuli on human perception, this study leverages eye-tracking technology to investigate online consumer behavior. The research captures the visual engagement of 60 healthy participants while they engage in online shopping, while also taking note of their preferred items for purchase. Subsequently, we apply statistical analysis and machine learning models to unravel the impact of visual complexity, consumer considerations, and preferred items, thereby providing valuable insights for the design of e-commerce platforms. Our findings indicate that the integration of eye-tracking data into e-commerce recommendation systems is conducive to enhancing their performance. Furthermore, machine learning algorithms exhibited remarkable classification capabilities when combined with eye-tracking data. Notably, during the purchase of hedonic products, participants primarily fixated on product images, whereas for utilitarian products, equal attention was dedicated to images, prices, reviews, and sales volume. These insights hold significant potential to augment the effectiveness of e-commerce marketing endeavors.
随着信息技术的进步和新冠肺炎疫情的广泛影响,消费者行为发生了重大转变,从传统的实体店购物转向在线零售领域。这一转变明显加速了在线零售业的增长。电子商务提供的一个重要优势在于它能够通过推荐系统积累和分析用户数据,包括浏览和购买历史。然而,流行的方法主要依赖于历史用户数据,这些数据往往缺乏理解在线交互过程中即时用户反应和情绪状态所需的动态性。认识到视觉刺激对人类感知的重大影响,本研究利用眼动追踪技术来调查在线消费者行为。这项研究记录了60名健康参与者在网上购物时的视觉参与情况,同时也记录了他们喜欢购买的商品。随后,我们应用统计分析和机器学习模型来揭示视觉复杂性、消费者考虑因素和偏好商品的影响,从而为电子商务平台的设计提供有价值的见解。我们的研究结果表明,将眼动追踪数据整合到电子商务推荐系统中,有利于提高电子商务推荐系统的性能。此外,机器学习算法在结合眼动追踪数据时表现出显著的分类能力。值得注意的是,在购买享乐产品时,参与者主要关注的是产品的形象,而在购买实用产品时,参与者同样关注的是产品的形象、价格、评论和销量。这些见解对提高电子商务营销努力的有效性具有重要的潜力。
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引用次数: 0
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