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2020 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)最新文献

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Packet-in Messages Handling Scheme to Reduce Controller Bottlenecks in OpenFlow Networks 减少OpenFlow网络中控制器瓶颈的入包消息处理方案
C. Khin, May Zin Oo, A. Kyaw
this paper proposes a mechanism that handles the packet-in messages to reduce the bottlenecks of controller in SDN/OpenFlow network. In SDN networks, the Openflow switches send many packet-in messages to forward every new flow of data. Then, the controller responds the flow rule for each packet-in message. Therefore, the bottlenecks can occur between controller and switches for sending three packets (one flooding and two packet-in messages) to add a new flow. The proposed system can reduce this bottleneck effect by adding a couple flow rules only with a single packet-in message. It is implemented using Mininet emulator to create a network topology and Ryu OpenFlow controller to manage the forwarding plane by the controller. The evaluation indicates that the proposed system is able to reduce one-third of packet overhead compared to original OpenFlow.
本文提出了一种处理入包消息的机制,以减少SDN/OpenFlow网络中控制器的瓶颈。在SDN网络中,Openflow交换机发送许多入包消息来转发每一个新的数据流。然后,控制器响应每个入包消息的流规则。因此,在发送三个数据包(一个泛洪消息和两个入包消息)以添加新流时,控制器和交换机之间可能会出现瓶颈。本文提出的系统可以通过仅对单个入包消息添加一对流规则来减少这种瓶颈效应。通过Mininet仿真器创建网络拓扑,Ryu OpenFlow控制器通过控制器管理转发平面实现。评估结果表明,与原有的OpenFlow相比,该系统能够减少三分之一的数据包开销。
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引用次数: 4
Novel Battery Charging Method using Hydrogen and Oxygen Gas Release Condition for Lead Acid Battery 基于氢氧气体释放条件的铅酸电池充电新方法
Nirutti Nilkeaw, Chairat Sornchai, Boonyang Plungklang
This paper presents the study of lead acid battery for charging process using Hydrogen (H) and Oxygen (O2) gas release condition. The battery of 12V/100 Ah is selected to study from the purposed. The battery charging methodology is combined from the basically charging with constant current, constant voltage and gas analysis method for finding fully charging condition. The measurement data from the charging process show gas leases with relate the H and O2 gas varies from the battery voltage. The O2 and H gas release can be defined into 2 sections. The second section the O2 gas release has high changed in more than H gas release that point the H gas will be linearized trend. Theses point of the second section can define the fully charging process of the LA battery with 15.5 V of battery voltage. Therefore, this method can be defined as maximum voltage for charging the LA battery and adapted in the future.
本文介绍了利用氢气(H)和氧气(O2)气体释放条件对铅酸蓄电池充电过程进行研究。从用途上选择12V/100 Ah的蓄电池进行研究。电池充电方法从基本充电与恒流、恒压和气体分析相结合,寻找完全充电状态。充电过程的测量数据表明,氢气和氧气气体随电池电压的变化而变化。O2和H气体的释放可以定义为两个部分。第二段O2气体释放量发生了较大的变化,大于H气体释放量,此时H气体将呈线性化趋势。第二节的这些点可以定义在15.5 V电池电压下,LA电池的完全充电过程。因此,该方法可以定义为为LA电池充电的最大电压,并在未来进行调整。
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引用次数: 0
An Evaluation of Risk Adjusted Measurements for Thai Mutual Funds 泰国共同基金风险调整测度之评估
Wipha Thomyamongkol, E. Nantajeewarawat, Pattravadee Ploykitikoon, Paramet Tanwanont
Risk adjusted measurements can be used to measure risk and volatility that are involved in investment returns. They are of great interest to investors. This paper focuses on evaluation of the risk adjusted measurements and aims to find the measurements that are most suitable for evaluating the performance of Thai mutual funds. Three popular risk adjusted measurements, i.e., Sharpe ratio, Treynor ratio, and Jensen’s alpha ratio, are used. Data from all funds in the bond asset class, the real estate asset class, and the equity asset class, from January 2013 to the end of December 2018 are used for the evaluation. The analysis shows that Jensen’s alpha ratio outperforms the other measurements in all the three asset classes.
风险调整度量可用于度量投资回报中涉及的风险和波动性。它们引起了投资者的极大兴趣。本文主要对风险调整测度进行评价,旨在寻找最适合评估泰国共同基金绩效的测度。使用了三种常用的风险调整度量,即夏普比率、特雷诺比率和詹森α比率。评估数据来自2013年1月至2018年12月底债券资产类别、房地产资产类别和股票资产类别的所有基金。分析表明,Jensen的alpha比率在所有三种资产类别中都优于其他测量方法。
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引用次数: 0
Clogged Pipe Detection and Monitoring by Using Acoustic Analysis Methodology 基于声学分析方法的管道堵塞检测与监测
Phattaleeya Mabpa, Piyasawat Navaratana Na Ayudhya, J. Kunthong
Clogged sewer pipelines are one of the main problems that cause Sanitary Sewer Overflow ( SSO) which leads to serious environmental issues and property damage. This work presented clogged pipe detection and monitoring methods based on acoustic analysis to identify pipe clogged occurrence and degree of blockage that can be mitigating the risks from SSO’s problems. The technique is to attach the vibration speaker on the pipe as an acoustic source. The clogged by blockage will be detected by reading the change in the pipe resonance frequency via the microphone installed on the other side of the pipeline. The resonance frequency of the measured signals was characterized by Fast Fourier Transforms (FFT). Compensation based line was used to normalize the frequency responses for easier acoustic analysis. The experiments have indicated the resonance frequency shifting down and Sound Pressure Level (SPL) decreasing when pipe clogged. Moreover, this paper provided the technique that offers small and noncomplex data which any classification method can identify pipe clogged easier in future work.
污水管道堵塞是造成污水溢流的主要问题之一,造成严重的环境问题和财产损失。这项工作提出了基于声学分析的堵塞管道检测和监测方法,以识别管道堵塞的发生情况和堵塞程度,从而降低SSO问题带来的风险。该技术是将振动扬声器连接在管道上作为声源。通过安装在管道另一侧的麦克风,通过读取管道谐振频率的变化来检测管道是否被堵塞。利用快速傅里叶变换(FFT)对测量信号的谐振频率进行表征。采用补偿线对频率响应进行归一化,便于声学分析。实验结果表明,管道堵塞时共振频率下降,声压级降低。此外,本文提供的技术提供了小而不复杂的数据,使任何分类方法都可以在今后的工作中更容易地识别管道堵塞。
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引用次数: 0
Prediction of Forthcoming Anger of Customer in Call Center Dialogs 呼叫中心对话中客户愤怒情绪的预测
J. Mongkolnavin, Widakorn Saewong
Call center is a department that is most relevant to audio data usage. One of its major tasks is to monitor customers’ anguish because it has a negative impact on the organization. One challenging task is to develop a model that can predict whether a customer is getting angry in the next turn of conversation. Such model can assist agents in taking appropriate action(s) to prevent the incidents. In this study, we investigate an approach to build an anger prediction model from customers’ voice in call center dialogs. To create the model requires 5 processes: (1) Customer’s turn extraction (2) Emotion annotation (3) Voice feature selection (4) Data pre-processing for long short-term memory networks, and (5) Anger prediction modeling. Five long short-term memory networks were built with the time series data sets of 1, 2, 3, 4, and 5 consecutive turns. The experimental results showed that the long short-term memory network built with the 3-consecutive turn data has promising performance in aspect of Average Precision and False Negative Rate when compared to the random and good guess benchmarks.
呼叫中心是与音频数据使用最相关的部门。它的主要任务之一是监控客户的痛苦,因为它对组织有负面影响。一项具有挑战性的任务是开发一个模型,可以预测客户是否会在下一轮对话中生气。该模型可协助代理人采取适当的行动,防止事故发生。在本研究中,我们研究了一种从呼叫中心对话中的客户声音建立愤怒预测模型的方法。建立模型需要5个过程:(1)客户回合提取(2)情绪标注(3)语音特征选择(4)长短期记忆网络数据预处理(5)愤怒预测建模。用连续1、2、3、4、5个回合的时间序列数据集构建了5个长短期记忆网络。实验结果表明,用连续3回合数据构建的长短期记忆网络在平均准确率和误报率方面都比随机和良好猜测基准有较好的表现。
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引用次数: 1
Improved Isolation of a Dual-Band MIMO Antenna Using Modified S-SRRs for Millimeter-Wave Applications 基于改进s - srr的双频MIMO天线在毫米波应用中的隔离性能
N. Supreeyatitikul, N. Teerasuttakorn
In this research, a miniaturized two-element multiple-input multiple-output (MIMO) antenna with high isolation by using metamaterial (MTM) has been presented for dual-band of millimeter-wave frequency (28 GHz and 38 GHz). The proposed MIMO antenna array has been etched on Rogers-5880 with an overall size of 23×10×0.787 mm3. The high isolation between two-element antennas was obtained by reducing the mutual coupling which employed the square split-ring resonators (S-SRRs). The S-SRRs can be achieved a low transmission coefficient of −34.56 dB and −49.85 dB at the entire operating frequency of 28 GHz and 38 GHz, respectively. The diversity performance of the proposed MIMO antenna array has been verified in order to prove the MIMO performance for mm-wave wireless communications.
在本研究中,利用超材料(MTM)设计了一种用于毫米波双频段(28ghz和38ghz)的小型化高隔离双单元多输入多输出(MIMO)天线。所提出的MIMO天线阵列已蚀刻在Rogers-5880上,总尺寸为23×10×0.787 mm3。采用方形分环谐振器(S-SRRs)降低了天线间的相互耦合,从而获得了高隔离度。在整个工作频率为28 GHz和38 GHz时,S-SRRs的传输系数分别为- 34.56 dB和- 49.85 dB。为了验证MIMO在毫米波无线通信中的性能,对MIMO天线阵列的分集性能进行了验证。
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引用次数: 4
Towards Team Formation in Software Development: A Case Study of Moodle 软件开发中的团队形成:以Moodle为例
Noppadol Assavakamhaenghan, Ponlakit Suwanworaboon, Waralee Tanaphantaruk, Suppawong Tuarob, Morakot Choetkiertikul
Software development is a team-based intensive activity where various skills (e.g. technical and analysis skills) are required to deliver high quality outcomes. An effective team member assignment is thus a crucial process. In this paper, we propose to adopt the existing machine learning approach for team recommendation to recommend software team members who are suitable for a given task. The approach take both individual strength and collaborative efficiency among team members into account to give a recommendation. We evaluate the approach on the Moodle project, well-known open source software project. The evaluation results show that the adopted approach yields a better recommendation performance compared to the baseline (i.e. random assignment approach).
软件开发是基于团队的密集活动,需要各种技能(例如技术和分析技能)来交付高质量的结果。因此,有效的团队成员分配是一个至关重要的过程。在本文中,我们建议采用现有的团队推荐机器学习方法来推荐适合给定任务的软件团队成员。该方法考虑到个人的力量和团队成员之间的协作效率来给出建议。我们在著名的开源软件项目Moodle项目上对这种方法进行了评估。评价结果表明,所采用的方法比基线方法(即随机分配方法)具有更好的推荐性能。
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引用次数: 2
A k-Factor Continuous Double Auction-Based Pricing Mechanism for the P2P Energy Trading in a LV Distribution System 基于k因子连续双拍卖的低压配电系统P2P能源交易定价机制
Pikkanate Angaphiwatchawal, Poowasarun Phisuthsaingam, S. Chaitusaney
With the development and low-cost trend of renewable energy technologies, particularly PV rooftop systems, energy consumers can produce electricity to self-consume and/or export the surplus energy into low-voltage (LV) distribution grids. The peer-to-peer (P2P) energy trading widely allows consumers with a generation role, called prosumers, to trade their surplus energy with other prosumers. The purpose of this study is to investigate how to impose the exchanged price between two P2P participants by using the k-factor continuous double auction (CDA) algorithm to scale up/down between seller’s offers and buyer’s bids submitted in the P2P energy trading. The k-factor is set to be varied between 0 and 1. The simulation results, based on the case study, show that the approximated value of k as of 0.6445 which is such that the benefits between sellers and buyers are equal is feasible. This states that the exchanged price between two participants can be formed with a combination between 64.45% and 35.55% of the buyer’s outstanding bid and the seller’s outstanding offer, respectively.
随着可再生能源技术,特别是屋顶光伏发电系统的发展和低成本趋势,能源用户可以自行发电和/或将多余的能源输出到低压配电网。点对点(P2P)能源交易广泛地允许具有发电角色的消费者(称为产消者)与其他产消者进行剩余能源交易。本研究的目的是探讨如何利用k因子连续双拍卖(CDA)算法,在P2P能源交易中,将买卖双方的出价按比例放大或缩小,从而在两个P2P参与者之间施加交换价格。k因子设置为在0和1之间变化。基于案例分析的仿真结果表明,使买卖双方收益相等的k近似值为0.6445是可行的。这表明两个参与者之间的交换价格可以分别由买方未完成出价的64.45%和卖方未完成出价的35.55%组成。
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引用次数: 8
Comparing Classifiers for the Prediction of the Stenosis of Coronary Artery 冠状动脉狭窄预测分类器的比较
Hataichanok Aakkara, Atumporn Aaisueb, Aeerapong Aeelanupab
Myocardial Ischemia is the main cause of mortality in patients with Coronary Artery Disease (CAD). One of the methods used in screening patients with this disease is the diag-nosis of radionuclide myocardial perfusion imaging (rMPI). In this paper, we conducted a comparative study by experimenting on several machine learning models, such as Logistic Regression, Random Forest, XGBoost, etc., to classify the stenosis of coronary artery. High-level features from rMPI computed by 4D-MSPECT polar map were used to train/test the models. rMPI features of the risk group of CAD patients were obtained from a public hospital. With the hypothesis that patient characteristics (e.g., Diabetes Mellitus, Hypertension, Dyslipidemia) could improve the prediction performance of the models, this study also included patient characteristics in our experimentation as important parts of feature selection. All other processes (i.e., data cleaning, feature selection, feature engineering and feature transformation) in machine learning pipeline were also deliberately experimented in this study. For model selection, two-level validation regarding generalization and hyperparameter tuning were also performed.
心肌缺血是冠心病(CAD)患者死亡的主要原因。放射性核素心肌灌注显像(rMPI)是筛查本病患者的方法之一。在本文中,我们通过实验几种机器学习模型,如Logistic Regression、Random Forest、XGBoost等,对冠状动脉狭窄进行分类,进行了对比研究。利用4D-MSPECT极坐标图计算的rMPI高级特征对模型进行训练/测试。CAD危险组rMPI特征从某公立医院获得。假设患者特征(如糖尿病、高血压、血脂异常)可以提高模型的预测性能,本研究也将患者特征作为特征选择的重要部分纳入实验。机器学习管道中的所有其他过程(即数据清洗、特征选择、特征工程和特征转换)也在本研究中进行了刻意的实验。对于模型选择,还进行了关于泛化和超参数调整的两级验证。
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引用次数: 0
Towards Performance Optimization for Hadoop MapReduce Applications 面向Hadoop MapReduce应用的性能优化
Thandar Htay, S. Phyu
Apache Hadoop is a widely used open-source distributed platform towards big data processing and provides YARN based distributed parallel processing framework on low cost commodity machines. However, YARN adopts static resource management (that is, the number of containers available per node and the size of each container are static in nature) depending on pre-configured default resource units called containers leading to poor performance to deal with various sort of MapReduce applications. In addition, during the last wave of a job, many available resources occur frequently being idle because YARN does not consider the wave behavior in tasks of MapReduce applications. To take advantage of idle resources resulting in performance improvement, the important parameter, the number of map tasks is needed to optimize based on the available resources and governed by split size. Therefore, this parameter is optimized through the split size tuning based on the available resources. To address the drawback of static resource management of yarn in Hadoop, the numbers of concurrent containers per machine are tuned to optimize the node performance for running each MapReduce application. As per experimental results, the proposed system that optimizes the selected parameter on optimized concurrent containers can achieve the performance gains of MapReduce applications while reducing the optimization overheads.
Apache Hadoop是一个广泛使用的面向大数据处理的开源分布式平台,在低成本的商用机器上提供基于YARN的分布式并行处理框架。然而,YARN采用静态资源管理(即每个节点可用的容器数量和每个容器的大小本质上是静态的),这取决于预配置的默认资源单元(称为容器),导致处理各种类型的MapReduce应用程序的性能较差。此外,在作业的最后一波期间,由于YARN没有考虑MapReduce应用程序任务中的波行为,许多可用资源经常出现空闲状态。为了利用空闲资源从而提高性能,需要根据可用资源和分割大小对映射任务的数量进行优化。因此,该参数通过基于可用资源的分割大小调优进行优化。为了解决Hadoop中yarn静态资源管理的缺点,我们调整了每台机器的并发容器数量,以优化运行每个MapReduce应用程序的节点性能。实验结果表明,本文提出的系统在优化的并发容器上对所选参数进行优化,可以在降低优化开销的同时实现MapReduce应用程序的性能提升。
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引用次数: 0
期刊
2020 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)
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