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Sensitivity Analysis of Radial Basis Function Networks for River Stage Forecasting 基于径向基函数网络的水位预报灵敏度分析
Pub Date : 2020-12-23 DOI: 10.4236/jsea.2020.1312022
C. Dawson
Sensitivity analysis of neural networks to input variation is an important research area as it goes some way to addressing the criticisms of their black-box behaviour. Such analysis of RBFNs for hydrological modelling has previously been limited to exploring perturbations to both inputs and connecting weights. In this paper, the backward chaining rule that has been used for sensitivity analysis of MLPs, is applied to RBFNs and it is shown how such analysis can provide insight into physical relationships. A trigonometric example is first presented to show the effectiveness and accuracy of this approach for first order derivatives alongside a comparison of the results with an equivalent MLP. The paper presents a real-world application in the modelling of river stage shows the importance of such approaches helping to justify and select such models.
神经网络对输入变化的敏感性分析是一个重要的研究领域,因为它在一定程度上解决了对其黑匣子行为的批评。用于水文建模的RBFNs的这种分析以前仅限于探索输入和连接权重的扰动。在本文中,用于MLP灵敏度分析的后向链接规则被应用于RBFNs,并展示了这种分析如何深入了解物理关系。首先给出了一个三角函数示例,展示了该方法对一阶导数的有效性和准确性,并将结果与等效MLP进行了比较。本文介绍了在河流水位建模中的实际应用,表明了这种方法的重要性,有助于证明和选择这种模型。
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引用次数: 0
Existence of Periodic Solutions for an Output Hidden Feedback Elman Neural Network 输出隐反馈Elman神经网络周期解的存在性
Pub Date : 2020-12-23 DOI: 10.4236/jsea.2020.1312023
V. Covachev, Z. Covacheva
We first recall the sufficient conditions for the existence of a periodic output of a modified Elman neural network with a periodic input found by using Mawhin’s continuation theorem of coincidence degree theory. Using this result, we obtain sufficient conditions for the existence of a periodic output for an output hidden feedback Elman neural network with a periodic input. Examples illustrating these sufficient conditions are given.
首先利用重合度理论中的Mawhin延拓定理,给出了具有周期输入的修正Elman神经网络存在周期输出的充分条件。利用这一结果,我们得到了具有周期输入的输出隐反馈Elman神经网络存在周期输出的充分条件。给出了说明这些充分条件的例子。
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引用次数: 0
A Value Token Transfer Protocol (VTTP) for Decentralized Finance 一种用于去中心化金融的价值令牌传输协议(VTTP)
Pub Date : 2020-11-26 DOI: 10.4236/jsea.2020.1311020
Arshdeep Bahga, V. Madisetti
We present Value Token Transfer Protocol (VTTP), a decentralized finance protocol for exchange of value or tokens within and between participating blockchain networks, fiat bank accounts and fiat wallets. The protocol allows intra-chain or inter-chain transfers of cryptocurrencies or tokens. VTTP works in both client-server and peer-to-peer models. The protocol comprises receiving from a client a transfer request to transfer value in a form of a cryptocurrency or a token, determining if the transfer request is intra-chain or inter-chain, transmitting to the client a response to the transfer request, the response comprising a raw transaction, receiving from the client a response to the raw transaction wherein a private key of a user is used to sign the raw transaction, defining a signed transaction, verifying a signature of the signed transaction and broadcasting the signed transaction to the sending and receiving blockchain networks.
我们提出了价值代币转移协议(VTTP),这是一种去中心化的金融协议,用于在参与的区块链网络、法定银行账户和法定钱包内和之间交换价值或代币。该协议允许加密货币或代币的链内或链间传输。VTTP可以在客户端-服务器和对等模型中工作。该协议包括从客户端接收以加密货币或代币形式转移价值的转移请求,确定该转移请求是链内还是链间,向客户端发送对该转移请求的响应,该响应包括原始交易,从所述客户端接收对所述原始交易的响应,其中用户的私钥用于签署所述原始事务,定义签名事务,验证签名事务的签名,并将签名事务广播到发送和接收区块链网络。
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引用次数: 1
Using Virtual Reality to Promote Physical Activity 利用虚拟现实促进体育活动
Pub Date : 2020-11-26 DOI: 10.4236/jsea.2020.1311021
Shuo Zhou
The purpose of this research is to develop an immersive virtual fitness center as an intervention to promote physical activity and examine its impacts on users’ exercise plans and exercise behaviors. The virtual reality (VR)-based intervention includes three main features: enabling the users to control their avatar, personalizing the avatar to look the same as the user, and visualizing the positive consequences of exercising. We conducted an experiment to randomly assign participants to two treatment groups: experiencing either the self or another person losing weight because of exercising in the virtual environment. The findings demonstrated that the self-avatar group exercised more in the voluntary section than the other-avatar group. However, participants in the self-avatar condition perceived a lower level of sense of presence compared to participants in the other-avatar condition. Compared to people in the control condition who watched and followed the exercise from a workout video, those who exercised in the virtual fitness center, regardless of whether the avatar was based on the self’s image or another person’s image, planned to spend more time on exercising in the following week. Theoretical and practical implications for using VR technology to promote health-related behavioral change, and why personalization decreases perceived sense of presence in the virtual environment are discussed.
本研究的目的是开发一种沉浸式虚拟健身中心作为促进身体活动的干预手段,并研究其对用户运动计划和运动行为的影响。基于虚拟现实(VR)的干预包括三个主要特征:使用户能够控制他们的虚拟化身,个性化虚拟化身,使其看起来与用户相同,以及可视化锻炼的积极后果。我们进行了一项实验,将参与者随机分配到两个治疗组:体验自己或另一个人因为在虚拟环境中锻炼而减肥。研究结果表明,自我化身组比其他化身组在自愿部分锻炼得更多。然而,在自我化身条件下的参与者感知到的存在感水平低于在其他化身条件下的参与者。与观看并跟随锻炼视频的对照组相比,那些在虚拟健身中心锻炼的人,无论虚拟形象是基于自己的形象还是基于他人的形象,都计划在接下来的一周花更多的时间在锻炼上。本文讨论了使用VR技术促进健康相关行为改变的理论和实践意义,以及为什么个性化会降低虚拟环境中的存在感。
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引用次数: 6
Enabling Proactive Management of School Dropouts Using Neural Network 使用神经网络实现辍学的主动管理
Pub Date : 2020-10-14 DOI: 10.4236/jsea.2020.1310016
K. Kalegele
The growing need to use Artificial Intelligence (AI) technologies in addressing challenges in education sectors of developing countries is undermined by low awareness, limited skill and poor data quality. One particular persisting challenge, which can be addressed by AI, is school dropouts whereby hundreds of thousands of children drop annually in Africa. This article presents a data-driven approach to proactively predict likelihood of dropping from schools and enable effective management of dropouts. The approach is guided by a carefully crafted conceptual framework and new concepts of average absenteeism, current cumulative absenteeism and dropout risk appetite. In this study, a typical scenario of missing quality data is considered and for which synthetic data is generated to enable development of a functioning prediction model using neural network. The results show that, using the proposed approach, the levels of risk of dropping out of schools can be practically determined using data that is largely available in schools. Potentially, the study will inspire further research, encourage deployment of the technologies in real life, and inform processes of formulating or improving policies.
利用人工智能技术应对发展中国家教育部门挑战的需求日益增长,但由于认识不足、技能有限和数据质量差,这一需求受到了削弱。人工智能可以解决的一个特别持久的挑战是辍学,非洲每年有数十万儿童辍学。本文提出了一种数据驱动的方法,可以主动预测辍学的可能性,并对辍学进行有效管理。该方法以精心制定的概念框架和平均缺勤率、当前累计缺勤率和辍学风险偏好的新概念为指导。在这项研究中,考虑了质量数据缺失的典型场景,并为其生成合成数据,以使用神经网络开发功能预测模型。结果表明,使用拟议的方法,可以使用学校中大量可用的数据来确定辍学风险水平。这项研究可能会激发进一步的研究,鼓励在现实生活中部署这些技术,并为制定或改进政策的过程提供信息。
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引用次数: 1
Enablers, Difficulties and Features to Implement E-Learning Technology in Conventional Higher Education: Case Study and Prototype Implication 传统高等教育实施电子学习技术的动因、难点和特点——案例研究与原型启示
Pub Date : 2020-10-14 DOI: 10.4236/jsea.2020.1310015
Yimer Amedie Muhie, Cheru Haile Tesfay, Biniyam Wondie Tamirat
Supporting higher education with modern technologies like E-Learning is very important for one country to improve quality of education, to meet student’s expectations and to continue teaching-learning and training when face to face education is impossible. However, it is in its preliminary stage in developing countries like Ethiopia. This study examined the enabling factors, difficulties and opportunities of E-Learning implementation in Assosa University (ASU), Ethiopia. Its purpose is to find the enabling factors, difficulties and opportunities of E-Learning implementation in ASU and developing prototype of E-Learning system to show its practicality and to identify approaches of students’ and lecturers towards E-Learning. The study employed questionnaires, observation and interview to gather the required information. A sample of 309 students and 64 Lecturers randomly selected from 7 colleges and two schools as well as ICT workers and other concerned bodies in the university. Also prototyping as a methodology was used to implement and test the proposed system for proof of concept. This study investigating the possibility of implementing E-Learning in ASU and important enablers, difficulties and opportunities is identified. Also the E-Learning platform of the university is developed and introduced for students and lecturers to show its practicality. Most students and lecturers showed good motivation in E-Learning implementation and they assumed that it is useful for the university. The result shows that although there are difficulties to implement E-Learning in ASU, the possibility of fully implementing E-Learning in the University is relatively high with mixed method. With this, the approaches of students and lecturers are positively viewed and the opportunities are very noticeable in the University. So, conventional higher education can practically implement E-Learning with mixed approach to use as supportive tool for educational improvements and to reduce physical presence.
对于一个国家来说,用电子学习等现代技术支持高等教育对于提高教育质量、满足学生的期望以及在无法进行面对面教育的情况下继续教学、学习和培训非常重要。然而,它在像埃塞俄比亚这样的发展中国家处于初级阶段。本研究考察了埃塞俄比亚Assosa大学实施电子学习的有利因素、困难和机遇。其目的是寻找ASU实施电子学习的有利因素、困难和机会,并开发电子学习系统的原型,以展示其实用性,并确定学生和讲师对电子学习的方法。这项研究采用了问卷调查、观察和访谈来收集所需的信息。从7所学院和2所学校随机抽取309名学生和64名讲师,以及该大学的信息和通信技术工作者和其他相关机构。原型设计作为一种方法也被用来实现和测试所提出的概念验证系统。本研究调查了在亚利桑那州立大学实施电子学习的可能性以及重要的促成因素、困难和机会。此外,还为学生和讲师开发和介绍了该大学的电子学习平台,以展示其实用性。大多数学生和讲师在实施电子学习方面表现出了良好的动机,他们认为这对大学有用。结果表明,尽管在亚利桑那州立大学实施电子学习存在困难,但采用混合方法在大学全面实施电子学习的可能性相对较高。有了这一点,学生和讲师的态度得到了积极的评价,机会在大学里非常明显。因此,传统的高等教育可以实际实施混合方法的电子学习,作为改善教育和减少物理存在的支持工具。
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引用次数: 0
Development of a 3D Conceptual Design Environment Using a Head Mounted Display Virtual Reality System 利用头戴式显示虚拟现实系统开发三维概念设计环境
Pub Date : 2020-10-14 DOI: 10.4236/JSEA.2020.1310017
Gabe Evans, Melynda Hoover, E. Winer
Engineering design is a resource intensive process with over half of a product’s total cost being attributed to design stage decisions. Developing product designs often involves creating complex 3D models in a 2D environment, a non-trivial task. This paper details a proof of concept VR environment displayed in a commodity HMD, specifically the HTC Vive. The environment allows a user to create full-scale, 3D, product geometry at the conceptual phase of the design process. The conceptual design environment contains a World-in-Miniature (WIM) model for enhanced usability. This method allows a user to efficiently manipulate full-scale geometry by adjusting the corresponding parts on a WIM model. Free-form mesh deformation was also implemented to provide designers with flexibility and efficiency not found in traditional design packages. Vital design metrics (e.g., cost, weight, and center of mass) were incorporated to allow a user to perform preliminary design analysis to assess product feasibility. Throughout the development process, the unique challenges and affordances associated with commodity HMDs were identified, explored, and discussed in this paper. Ultimately, the VR application discussed in this paper allows the user to easily create, assess, and view conceptual 3D designs without the constraints of traditional CAD software.
工程设计是一个资源密集的过程,产品总成本的一半以上归因于设计阶段的决策。开发产品设计通常涉及在2D环境中创建复杂的3D模型,这是一项艰巨的任务。本文详细介绍了在商品HMD中展示的概念验证VR环境,特别是HTC Vive。该环境允许用户在设计过程的概念阶段创建全尺寸的3D产品几何形状。概念设计环境包含一个用于增强可用性的微缩世界(WIM)模型。该方法允许用户通过在WIM模型上调整相应的部件来有效地操作全尺寸几何。还实现了自由形式的网格变形,为设计人员提供了传统设计软件包所没有的灵活性和效率。重要的设计指标(例如,成本,重量和质心)被纳入允许用户执行初步设计分析以评估产品可行性。在整个开发过程中,本文确定、探索和讨论了与商用hmd相关的独特挑战和能力。最终,本文中讨论的VR应用程序允许用户轻松创建,评估和查看概念3D设计,而不受传统CAD软件的限制。
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引用次数: 0
Improving Quality of Education by Evaluating the Capacity of Lecturers Using a Web Based System 利用网络系统评估讲师能力提高教育质量
Pub Date : 2020-10-14 DOI: 10.4236/jsea.2020.1310019
Yimer Amedie Muhie, Abeselom Befekadu Wolde, Cheru Haile Tesfay, B. Bedada
Evaluating the capacity of lecturer is the key to improve quality of education by improving lecturer capacity in higher education institution. Lecturer’s capacity has been evaluated using different parameters in Assosa University, Ethiopia. Mandatorily, lecturers are evaluated using printed check list. For the last few years we observed that, the lecturer efficiency score is found on the shelf and not checked by anyone to know the gaps and to establish follow-up system. The use of intranet based web system is better to use lecturer’s efficiency result to monitor their performance and to establish follow-up mechanism. In this study, a prototype of web based yearbook efficiency management system for evaluating and monitoring the performance of lecturers was designed and developed. The evaluation process in the system was presented according to the university evaluation format. The output generated by the proposed system can be used by lecturers, HoD, HRM and academic managers to monitor teaching performance.
评价讲师能力是提高高校讲师能力,提高教育质量的关键。埃塞俄比亚Assosa大学使用不同的参数对讲师的能力进行了评估。讲师必须使用打印的检查表进行评估。在过去的几年里,我们观察到,讲师的效率分数是在货架上找到的,没有人检查以了解差距并建立后续系统。使用基于intranet的web系统,可以更好地利用讲师的效率结果来监控他们的表现,并建立后续机制。本研究设计并开发了一个基于网络的年鉴效率管理系统原型,用于评估和监控讲师的绩效。系统中的评估过程是根据大学评估格式提出的。讲师、HoD、人力资源管理和学术管理人员可以使用拟议系统产生的输出来监控教学绩效。
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引用次数: 1
Result-as-a-Service (RaaS): Persistent Helper Functions in a Serverless Offering 结果即服务(RaaS):无服务器产品中的持久Helper函数
Pub Date : 2020-10-14 DOI: 10.4236/jsea.2020.1310018
Arshdeep Bahga, V. Madisetti, Joel R. Corporan
Serverless Computing or Functions-as-a-Service (FaaS) is an execution model for cloud computing environments where the cloud provider executes a piece of code (a function) by dynamically allocating resources. When a function has not been executed for a long time or is being executed for the first time, a new container has to be created, and the execution environment has to be initialized resulting in a cold start. Cold start can result in a higher latency. We propose a new computing and execution model for cloud environments called Result-as-a-Service (RaaS), which aims to reduce the computational cost and overhead while achieving high availability. In between successive calls to a function, a persistent function can help in successive calls by precomputing the functions for different possible arguments and then distributing the results when a matching function call is found.
无服务器计算或功能即服务(FaaS)是云计算环境的执行模型,云提供商通过动态分配资源来执行一段代码(一个函数)。当函数长时间未执行或首次执行时,必须创建一个新容器,并且必须初始化执行环境,从而导致冷启动。冷启动可能会导致更高的延迟。我们提出了一种新的云环境计算和执行模型,称为结果即服务(RaaS),旨在降低计算成本和开销,同时实现高可用性。在对函数的连续调用之间,持久函数可以通过预计算不同可能参数的函数,然后在找到匹配的函数调用时分发结果,来帮助进行连续调用。
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引用次数: 0
Assessment and Prediction of Software Reliability in Mobile Applications 移动应用软件可靠性评估与预测
Pub Date : 2020-09-21 DOI: 10.4236/jsea.2020.139012
Osama Barack, LiGuo Huang
Software reliability is an important quality attribute, and software reliability models are frequently used to measure and predict software maturity. The nature of mobile environments differs from that of PC and server environments due to many factors, such as the network, energy, battery, and compatibility. Evaluating and predicting mobile application reliability are real challenges because of the diversity of the mobile environments in which the applications are used, and the lack of publicly available defect data. In addition, bug reports are optionally submitted by end-users. In this paper, we propose assessing and predicting the reliability of a mobile application using known software reliability growth models (SRGMs). Four software reliability models are used to evaluate the reliability of an open-source mobile application through analyzing bug reports. Our experiment proves it is possible to use SRGMs with defect data acquired from bug reports to assess and predict the software reliability in mobile applications. The results of our work enable software developers and testers to assess and predict the reliability of mobile software applications.
软件可靠性是一个重要的质量属性,软件可靠性模型经常被用来衡量和预测软件成熟度。移动环境的性质与PC和服务器环境的性质不同,这是由于许多因素造成的,如网络、能源、电池和兼容性。评估和预测移动应用程序的可靠性是真正的挑战,因为应用程序使用的移动环境的多样性,以及缺乏公开可用的缺陷数据。此外,最终用户可以选择提交错误报告。在本文中,我们建议使用已知的软件可靠性增长模型(SRGM)来评估和预测移动应用程序的可靠性。通过分析错误报告,使用四个软件可靠性模型来评估开源移动应用程序的可靠性。我们的实验证明,使用SRGM和从错误报告中获得的缺陷数据来评估和预测移动应用程序中的软件可靠性是可能的。我们的工作结果使软件开发人员和测试人员能够评估和预测移动软件应用程序的可靠性。
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引用次数: 9
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