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2016 3rd National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS)最新文献

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Adaptive methods for job recommendation based on user clustering 基于用户聚类的自适应工作推荐方法
Quoc-Dung Nguyen, Tin Huynh, Tu-Anh Nguyen-Hoang
Job recommender systems are designed to suggest a ranked list of jobs that could be associated with employee's interest. Most of existing systems use only one approach to make recommendation for all employees, while a specific method normally is good enough for a group of employees. Therefore, this study proposes an adaptive solution to make job recommendation for different groups of user. The proposed methods are based on employee clustering. Firstly, we group employees into different clusters. Then, we select a suitable method for each user cluster based on empirical evaluation. The proposed methods include CB-Plus, CF-jFilter and HyR-jFilter have applied for different three clusters. Empirical results show that our proposed methods is outperformed than traditional methods.
工作推荐系统的设计目的是建议一个与员工兴趣相关的工作排名列表。大多数现有的系统只使用一种方法对所有员工进行推荐,而一种特定的方法通常对一组员工足够好。因此,本研究提出了一种针对不同用户群体进行工作推荐的自适应解决方案。提出的方法是基于员工聚类的。首先,我们将员工分成不同的集群。然后,在经验评价的基础上,为每个用户群选择合适的方法。提出的方法包括CB-Plus、CF-jFilter和HyR-jFilter,分别适用于不同的三个集群。实证结果表明,本文提出的方法优于传统方法。
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引用次数: 8
Performance analysis of MMW/RoF link in broadband optical-wireless access networks 宽带光无线接入网中毫米波/RoF链路的性能分析
Thu A. Pham, H. Pham, Hai-Chau Le, N. Dang
In this paper, we investigate the performance of a millimeter-wave (MMW) radio-over-fiber (RoF) link, which is used to provide high data-rate and flexible connections in next-generation broadband optical-wireless access networks. The mixed optical fiber/wireless channel is assumed to be a dispersive and fading channel. Other physical layer impairments including noise and nonlinear distortion are also included in our analysis. The numerical results show that fiber dispersion and fading are key factors that limit the link performance. Therefore, dispersion shifted fibers should be used to reduce the effect of dispersion so as to improve the bit-error rate. To mitigate the effect of multipath fading, the remote radio heads (RRHs) or users should be located as near the remote antenna unit (RAU) as possible.
在本文中,我们研究了毫米波(MMW)无线光纤(RoF)链路的性能,该链路用于在下一代宽带光无线接入网中提供高数据速率和灵活的连接。假设光纤/无线混合信道为色散衰落信道。其他物理层损伤包括噪声和非线性失真也包括在我们的分析中。数值计算结果表明,光纤色散和衰落是限制链路性能的关键因素。因此,应采用色散移位光纤来降低色散的影响,从而提高误码率。为了减轻多径衰落的影响,远端无线电头(RRHs)或用户应尽可能靠近远端天线单元(RAU)。
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引用次数: 1
Towards an argument-based method for answering why-question in Vietnamese language 越南语“为什么”问题的论证式回答方法研究
C. T. Nguyen, Dang Tuan Nguyen
In this paper, an argument-based method of answering why-questions in Vietnamese is presented. This method is developed in different way from many approaches which use cue phrases of causal relation to find the answers for why-questions. In this method, the arguments is extracted firstly, then the causal part and consequential part of every argument are split in order to index the consequential part. When a why-question is asked, the asking information is extracted and used to search for the reason, then the reason is used to identify the paragraph which can be used to answer the question. For evaluation, an experiment with keyword-based information retrieval and simple argument collecting process is conducted to show the applicability of the method.
本文提出了一种基于论证的越南语“为什么”问题的回答方法。这种方法的发展方式不同于许多使用因果关系线索短语来寻找为什么问题的答案的方法。该方法首先提取论点,然后将每个论点的因果部分和结果部分分开,以便对结果部分进行索引。当提出“为什么”问题时,提取问题信息并用于搜索原因,然后使用原因识别可用于回答问题的段落。为了进行评估,进行了基于关键字的信息检索和简单的参数收集过程的实验,以证明该方法的适用性。
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引用次数: 1
Optimal precoder designs for energy-efficiency maximization in secure MIMO systems 安全MIMO系统中能源效率最大化的最优预编码器设计
Thanh Tung Vu, H. H. Kha
In this paper, precoding techniques are investigated for secure energy-efficient multiple-input multiple-output (MIMO) systems in the presence of an eavesdropper. To tackle the non-convexity of the secure energy efficiency maximization (SEEM) problem, we employ branch-and-reduce-and-bound (BRB) approach to obtain the globally optimal solution. It is observed that the BRB algorithm suffers from highly computational cost, its globally optimal solution is importantly served as a benchmark for the performance evaluation of the suboptimal algorithms. This motivates us to develop a low-complexity approach using the well-known zero-forcing (ZF) technique to cancel the wiretapped signal. In ZF based method, the SEEM problem can be transformed to a concave-convex fractional one and, then, be solved by the combination of the Dinkelbach and bisection search algorithm. Simulation results reveal that the ZF based method can converge fast and obtain a sub-optimal performance in compared with the optimal solution of the BRB method. The ZF based scheme also outperforms the conventional secrecy rate maximization precoder design in terms of the energy efficiency.
本文研究了存在窃听器的安全高效多输入多输出(MIMO)系统的预编码技术。为了解决安全能效最大化问题的非凸性问题,我们采用分支约界方法获得全局最优解。BRB算法具有较高的计算量,其全局最优解是评价次优算法性能的重要基准。这促使我们开发一种低复杂性的方法,使用众所周知的零强迫(ZF)技术来取消窃听信号。在基于ZF的方法中,可以将SEEM问题转化为凹凸分数阶问题,然后结合Dinkelbach和二分搜索算法求解。仿真结果表明,与BRB方法的最优解相比,基于ZF的方法收敛速度快,且具有次优性能。基于ZF的方案在能源效率方面也优于传统的保密率最大化预编码器设计。
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引用次数: 3
Study on a two-loop control architecture to balance an inertia wheel pendulum 惯性轮摆双环控制体系的研究
Tan-Sy Nguyen, Thai-Hoang Huynh
The paper presents a new control architecture consisting of two control loops to balance an Inertia Wheel Pendulum (IWP) of which the wheel is driven by a DC motor. The outer control loop uses a LQR controller to calculate the required torque to balance the IWP around the upright position based on the measurement of the pendulum angle and angular velocity. The inner control loop uses a PI controller to calculate the voltage applied to the DC motor such that the torque provided by the motor meets the requirement of the outer loop. Matlab simulation and real hardware experiments have been carried out to validate the effectiveness of the proposed method.
本文提出了一种由两个控制回路组成的新型控制体系,用于平衡由直流电机驱动的惯性轮摆。外控制环采用LQR控制器,根据测量的摆角和角速度,计算出平衡IWP在垂直位置所需的转矩。内控制环使用PI控制器计算施加到直流电机上的电压,使电机提供的转矩满足外环的要求。通过Matlab仿真和实际硬件实验验证了所提方法的有效性。
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引用次数: 1
A wireless sensor network solution for monitoring water quality in Botswana 用于监测博茨瓦纳水质的无线传感器网络解决方案
Mompoloki Pule, A. Yahya, J. Chuma
Wireless Sensor Networks (WSNs) provide reliable and affordable infrastructure for various applications ranging from environmental monitoring, industrial automation, telemedicine, to military surveillance. These networks allow monitoring processes to be conducted remotely, in real-time and with minimal human intervention. Water quality monitoring is essential to the provision of clean and safe water. In Botswana, Water Utilities Corporation (WUC), has adopted a conventional like process that employs several independent hand held meters for sampling different water quality parameters manually. However, this process has proved to be ineffective since it is expensive, time consuming, requires considerable human resource capacity and lacks real-time results to promote proactive response to water contamination. In this work, an integrated WSN based solution that employs Libelium's Waspmote platform has been developed. The sensor node is based on ATMEL's ATmega 1281 8-bit low power microcontroller which can operate for more than a year without recharging its battery. Results have shown that the proposed system managed to sample associated water quality parameters in real time with the same accuracy as currently adopted methods. In addition, the system is autonomous, easy to install, highly scalable and has a relatively high sampling rate which improves the temporal resolution of the monitoring process.
无线传感器网络(wsn)为各种应用提供可靠和负担得起的基础设施,从环境监测,工业自动化,远程医疗到军事监视。这些网络可以远程、实时地进行监测过程,并且人工干预最少。水质监测对提供清洁和安全的水至关重要。在博茨瓦纳,水务公司(WUC)采用了一种传统的方法,使用几个独立的手持式仪表手动采样不同的水质参数。然而,这一过程已被证明是无效的,因为它昂贵、耗时、需要大量的人力资源能力,并且缺乏实时结果来促进对水污染的主动反应。在这项工作中,采用Libelium的Waspmote平台开发了一个基于WSN的集成解决方案。传感器节点基于ATMEL的ATmega 1281 8位低功耗微控制器,可以在不充电的情况下工作一年以上。结果表明,所提出的系统能够以与目前采用的方法相同的精度实时采样相关水质参数。此外,该系统具有自主性,易于安装,高度可扩展性和较高的采样率,从而提高了监测过程的时间分辨率。
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引用次数: 5
Hardware implementation of cyclic codes error correction on FPGA 循环码纠错的FPGA硬件实现
Van-Tinh Nguyen, V. Dao, T. Phan
This paper designs and implements a codec system using the Cyclic code on FPGA. The encoding system was based on the principle of dividing circuits and the decoding system was based on the principle of the Meggitt decoder. This work proposes the look-up table (LUT) method for the decoding system. The implementation results from FPGA show that the proposed decoding method has exactly resulted. In addition, the proposed cyclic decoder core using the look-up table method has lower resource and number of cycles compared to the cyclic decoder core using the Meggitt method.
本文在FPGA上设计并实现了一种基于循环码的编解码系统。编码系统基于分路原理,解码系统基于梅吉特解码器原理。本文提出了解码系统的查找表(LUT)方法。在FPGA上的实现结果表明,所提出的解码方法取得了良好的效果。此外,与使用Meggitt方法的循环解码器核相比,使用查找表方法的循环解码器核具有更低的资源和周期数。
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引用次数: 2
A reconfigurable heterogeneous multicore architecture for DDoS protection 一种可重构的异构多核DDoS防护架构
C. Pham-Quoc, Biet Nguyen-Hoang, T. N. Thinh
This paper proposes a reconfigurable heterogeneous multicore architecture to integrate multiple DDoS defense mechanisms for DDoS protection. The architecture allows multiple cooperating DDoS mitigation techniques to classify incoming network packets. The proposed architecture consists of two separated partitions: static and dynamic. The static partition includes packet pre-processing and post-processing modules while the DDoS filtering techniques are implemented on the dynamic partition. These filtering techniques can be implemented by either hardware custom computing cores or general purpose soft processors or both. In all cases, these DDoS filtering computing cores can be updated or changed at runtime or design time. We implement our first prototype system with Hop-count filtering and Ingress/Engress filtering techniques using Xilinx Virtex 5xc5vtx240t FPGA device. The synthesis results show that the system can work at up to 116.782MHz while utilizing about 41% LUTs, 47% Registers, and 53% Block Memory of the available hardware resources. The system achieves the detection rate of 100% with the false negative rate at 0% and false positive rate closed to 0.74%. The prototype system achieves packet decoding throughput at 9.869 Gbps in half-duplex mode and 19.738 Gbps in full-duplex mode.
该文提出一种可重构异构多核架构,集成多种DDoS防御机制,实现DDoS防护。该体系结构允许多种协作的DDoS缓解技术对传入的网络数据包进行分类。所建议的体系结构由两个分离的分区组成:静态和动态。静态分区包括报文预处理和后处理模块,而DDoS过滤技术在动态分区上实现。这些过滤技术可以通过硬件自定义计算核心或通用软处理器实现,或者两者兼而有之。在所有情况下,这些DDoS过滤计算核心都可以在运行时或设计时更新或更改。我们使用Xilinx Virtex 5xc5vtx240t FPGA器件实现了带有跳数滤波和入口/入口滤波技术的第一个原型系统。综合结果表明,该系统可以在高达116.782MHz的频率下工作,同时利用约41%的lut、47%的寄存器和53%的块内存。系统的检测率为100%,假阴性率为0%,假阳性率接近0.74%。原型系统在半双工模式下实现了9.869 Gbps的分组解码吞吐量,在全双工模式下实现了19.738 Gbps的分组解码吞吐量。
{"title":"A reconfigurable heterogeneous multicore architecture for DDoS protection","authors":"C. Pham-Quoc, Biet Nguyen-Hoang, T. N. Thinh","doi":"10.1109/NICS.2016.7725648","DOIUrl":"https://doi.org/10.1109/NICS.2016.7725648","url":null,"abstract":"This paper proposes a reconfigurable heterogeneous multicore architecture to integrate multiple DDoS defense mechanisms for DDoS protection. The architecture allows multiple cooperating DDoS mitigation techniques to classify incoming network packets. The proposed architecture consists of two separated partitions: static and dynamic. The static partition includes packet pre-processing and post-processing modules while the DDoS filtering techniques are implemented on the dynamic partition. These filtering techniques can be implemented by either hardware custom computing cores or general purpose soft processors or both. In all cases, these DDoS filtering computing cores can be updated or changed at runtime or design time. We implement our first prototype system with Hop-count filtering and Ingress/Engress filtering techniques using Xilinx Virtex 5xc5vtx240t FPGA device. The synthesis results show that the system can work at up to 116.782MHz while utilizing about 41% LUTs, 47% Registers, and 53% Block Memory of the available hardware resources. The system achieves the detection rate of 100% with the false negative rate at 0% and false positive rate closed to 0.74%. The prototype system achieves packet decoding throughput at 9.869 Gbps in half-duplex mode and 19.738 Gbps in full-duplex mode.","PeriodicalId":347057,"journal":{"name":"2016 3rd National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116820757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of hardware impairments on secrecy performance of multi-hop relay networks in presence of multiple eavesdroppers 存在多个窃听者时硬件损伤对多跳中继网络保密性能的影响
Dang The Hung, Tran Trung Duy, D. Trinh, Vo Nguyen Quoc Bao, Tan Hanhv
This paper investigates impact of hardware impairments on the probability of Non-zero Secrecy Capacity (NSC) of multi-hop relay networks. In the considered protocol, multiple eavesdroppers attempt to overhear the data that is relayed from a source to a destination via multiple intermediate relay nodes. To enhance the secrecy performance, the multi-hop randomize-and-forward (RF) strategy is used to confuse the eavesdroppers. We derive exact expressions of the NSC probability in integral forms over Rayleigh fading channels. Moreover, these formulas are then expressed by sums of infinite series of exponential functions and exponential integral functions. Finally, Monte Carlo simulations are performed to verify our derivations.
研究了硬件缺陷对多跳中继网络非零保密能力(NSC)概率的影响。在考虑的协议中,多个窃听者试图窃听通过多个中间中继节点从源中继到目标中继的数据。为了提高保密性能,采用多跳随机转发(RF)策略来迷惑窃听者。我们得到了瑞利衰落信道上NSC概率的积分形式的精确表达式。然后用指数函数和指数积分函数的无穷级数的和来表示这些公式。最后,进行了蒙特卡罗模拟来验证我们的推导。
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引用次数: 3
Unconstrained gender classification by multi-resolution LPQ and SIFT 基于多分辨率LPQ和SIFT的无约束性别分类
Huu-Tuan Nguyen, T. Huong
One of the most critical tasks in building a gender classification is how to describe the human face as a highly discriminative feature vector. To this end, in this paper we introduce a new handcrafted feature extraction method for unconstrained gender classification problem. From one input face image, we generate its smaller version and apply two LPQ operators on both of them. We then combine the obtained LPQ features with the SIFT feature extracted from the given image to constitute a global facial description. In the classification stage, the binary SVM classifier is used for determining the gender of the test images. To evaluate the recognition performance of the proposed methods, we carry out experiments upon two widely used unconstrained face databases Adience and LFW. The results show that our approach attains good classification rates (96.51% and 80.5% on LFW and Adience databases, respectively) and can be comparable with state-of-the-art systems.
建立性别分类最关键的任务之一是如何将人脸描述为高度判别的特征向量。为此,本文引入了一种新的手工特征提取方法来解决无约束性别分类问题。从一个输入的人脸图像中,我们生成其较小的版本,并在它们上应用两个LPQ算子。然后,我们将得到的LPQ特征与从给定图像中提取的SIFT特征结合起来,构成一个全局的面部描述。在分类阶段,使用二值支持向量机分类器确定测试图像的性别。为了评估所提方法的识别性能,我们在两个广泛使用的无约束人脸数据库Adience和LFW上进行了实验。结果表明,我们的方法获得了良好的分类率(在LFW和Adience数据库上分别为96.51%和80.5%),可以与最先进的系统相媲美。
{"title":"Unconstrained gender classification by multi-resolution LPQ and SIFT","authors":"Huu-Tuan Nguyen, T. Huong","doi":"10.1109/NICS.2016.7725652","DOIUrl":"https://doi.org/10.1109/NICS.2016.7725652","url":null,"abstract":"One of the most critical tasks in building a gender classification is how to describe the human face as a highly discriminative feature vector. To this end, in this paper we introduce a new handcrafted feature extraction method for unconstrained gender classification problem. From one input face image, we generate its smaller version and apply two LPQ operators on both of them. We then combine the obtained LPQ features with the SIFT feature extracted from the given image to constitute a global facial description. In the classification stage, the binary SVM classifier is used for determining the gender of the test images. To evaluate the recognition performance of the proposed methods, we carry out experiments upon two widely used unconstrained face databases Adience and LFW. The results show that our approach attains good classification rates (96.51% and 80.5% on LFW and Adience databases, respectively) and can be comparable with state-of-the-art systems.","PeriodicalId":347057,"journal":{"name":"2016 3rd National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134353780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
期刊
2016 3rd National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS)
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