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2016 International Conference on Computer, Information and Telecommunication Systems (CITS)最新文献

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Design and realization of IMA/DIMA system management based on avionics switched network 基于航电交换网络的IMA/DIMA系统管理的设计与实现
Yukai Hao, Xiaohong Zhang, Xining Cui, Baolei Huang
The advantages of avionics switched network in network scale and flexibility greatly improve the communication performance of avionics network, promote the development of IMA/DIMA technology and also increase network scale and complexity. Meanwhile, requirements for the management of the avionics system are also on the rise. In this paper, the characteristics of SNMP protocol and airborne switched network are analyzed. The IMA/DIMA system structure is outlined and key demands for system management are extracted According to an IMA system model adopting AFDX as its backbone network with cascading dual integrate processing computers for backup and interconnection, the system management functions of the IMA system are realized in line with the ARINC653 standard partition operating system based on the SNMP protocol, including structure management, fault management, configuration management, etc. specific to LRM/LRU and attached devices under the IMA/DIMA system as well as the dual-machine hot backup function, which can be applied in an IMA/DIMA system consisted of AFDX/FC/TTE and several other airborne switched networks.
航电交换网络在网络规模和灵活性方面的优势极大地提高了航电网络的通信性能,促进了IMA/DIMA技术的发展,同时也增加了网络的规模和复杂性。同时,对航电系统管理的要求也越来越高。本文分析了SNMP协议和机载交换网络的特点。概述了IMA/DIMA系统结构,提取了系统管理的关键需求。根据以AFDX为骨干网络,级联双集成处理计算机备份互联的IMA系统模型,按照基于SNMP协议的ARINC653标准分区操作系统,实现了IMA系统的系统管理功能,包括结构管理、故障管理、配置管理、等,针对IMA/DIMA系统下LRM/LRU及其附属设备,以及双机热备份功能,可应用于由AFDX/FC/TTE等多个机载交换网络组成的IMA/DIMA系统。
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引用次数: 2
Mining co-location patterns with spatial distribution characteristics 挖掘具有空间分布特征的同址模式
Jiasong Zhao, Lizhen Wang, Xuguang Bao, Y. Tan
Spatial co-location patterns represent the subsets of Boolean spatial features, and the instances of the pattern are frequently located together in a geographic space. Most existing co-location pattern mining methods mainly focus on whether spatial feature instances are frequently located together. However, that the occurrence of neighbor relationships is in the whole space or local area is not considered. In this paper, a new measurement using an evenness coefficient of the feature distribution is introduced, and a novel algorithm for co-location pattern mining is proposed, which takes into account the prevalence of the spatial feature and the spatial distribution characteristics of feature instances. Furthermore, some key techniques are presented, including region partition and count of row instances in this algorithm. The experimental evaluation with both synthetic data sets and a real world data set shows that the algorithm can discover prevalent and evenly distributional co-location patterns, and the number of the result set is effectively reduced compare to the traditional mined results.
空间共定位模式表示布尔空间特征的子集,该模式的实例通常位于一个地理空间中。现有的同位模式挖掘方法主要关注空间特征实例是否频繁地定位在一起。但不考虑邻域关系的发生是在整个空间还是局部区域。本文引入了一种基于特征分布均匀系数的新度量方法,并提出了一种考虑空间特征的普遍性和特征实例的空间分布特征的同位模式挖掘算法。在此基础上,提出了该算法的关键技术,包括区域划分和行实例计数。合成数据集和真实数据集的实验评估表明,该算法可以发现普遍且均匀分布的共定位模式,并且与传统的挖掘结果相比,结果集的数量有效减少。
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引用次数: 2
Joint hierarchical modulation and network coding for asymmetric data transmission in wireless cooperative communication 无线协作通信中非对称数据传输的联合分层调制和网络编码
Cuiqin Dai, Nan-Nan Huang, Hai-Xia Ran
Asymmetric data transmission is a challenge factor in wireless communication channel. In this paper, we study the issue of data processing in asymmetric data transmission from different sources in wireless communication channel, and propose a Joint Hierarchical Modulation and Network Coding (JHMNC) scheme. In the proposed scheme, the procedure of JHMNC is analyzed and compared with the traditional zero padding and Opportunistic User Selection (OUS) schemes which are the generally existed schemes in asymmetric data transmission in wireless channel, and the closed-form expressions of the End-to-End (E2E) Bit Error Rate (BER) for the aforementioned schemes are derived by analyzing the transmission of each node. Simulation results illustrate that the proposed scheme improves the BER performance without additional complexity compared with the traditional zero padding scheme, also can outperform OUS scheme in terms of the average throughput and the channel access probability.
非对称数据传输是无线通信信道中的一个难题。本文研究了无线通信信道中不同来源的非对称数据传输中的数据处理问题,提出了一种联合分层调制和网络编码(JHMNC)方案。在该方案中,分析了JHMNC的过程,并与传统的零填充和机会用户选择(Opportunistic User Selection, ou)等无线信道非对称数据传输中普遍存在的方案进行了比较,通过分析各节点的传输情况,推导出了上述方案的端到端误码率(E2E)的封闭表达式。仿真结果表明,与传统的零填充方案相比,该方案在不增加复杂性的情况下提高了误码率性能,并且在平均吞吐量和信道访问概率方面优于ou方案。
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引用次数: 1
Multilayer perceptron for modulation recognition cognitive radio system 调制识别认知无线电系统的多层感知器
Minglong Xue, Haifeng Wu, Yu Zeng
Cognitive radio could detect the white space of spectrum and utilize spectrum resource efficiently. In a cognitive radio system, the recognition of signal modulation is a key technology, which would help the cognitive radio system to configure and realize intelligent green communication. In general, the recognition of signal modulation is not a linear classification. Back propagation (BP) neural network could solve the nonlinear classification. In this paper, we propose a training technique, cubature Kalman filters (CKF) to train a BP network. The network could better classify the nonlinear problem for the modulation recognition in a cognitive radio system. Through the simulation, the results show that the proposed training technique works better than existing techniques for nonlinear modulation classification in a cognitive radio system.
认知无线电能够有效地检测频谱空白,有效地利用频谱资源。在认知无线电系统中,信号调制识别是认知无线电系统配置和实现智能绿色通信的关键技术。一般来说,信号调制的识别不是线性分类。BP神经网络可以解决非线性分类问题。在本文中,我们提出了一种训练技术——培养卡尔曼滤波(CKF)来训练BP网络。该网络能较好地对认知无线电系统中调制识别中的非线性问题进行分类。仿真结果表明,在认知无线电系统中,所提出的训练方法比现有的非线性调制分类方法效果更好。
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引用次数: 0
The recognition of Laos organization name based on a cascaded conditional random fields 基于级联条件随机场的老挝组织名称识别
Shaopeng Duan, Lanjiang Zhou, Feng Zhou
The recognition of Laos organization name is a difficult problem in the entity recognition of Laos language. This paper presents a algorithm of Laos organization name recognition model based on cascaded conditional random fields. The algorithm solved the recognition of easy entity such as person name and location name in the lower model of conditional random fields(CRFs) and served the recognition of complicated organization names on the higher CRFs. This paper designed a efficient feature template and automatic feature selection algorithm for the conditional random fields model of organization names. In the open test of a mass linguistic data, the recall rate reached 79.67%, precision rate reached 77.72%, F - measure reached 78.68%.
老挝组织名称的识别是老挝语实体识别中的一个难题。提出了一种基于级联条件随机场的老挝组织名称识别模型算法。该算法在条件随机场的低阶模型上解决人名、地名等简单实体的识别问题,在高阶模型上解决复杂机构名称的识别问题。针对组织名称的条件随机场模型,设计了一种高效的特征模板和自动特征选择算法。在海量语言数据的公开测试中,查全率达到79.67%,查准率达到77.72%,F - measure达到78.68%。
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引用次数: 0
Recursive construction of quasi-cyclic cycle LDPC codes based on replacement products 基于替换产品的准循环LDPC码的递归构造
Jiayi Huang, Xueqin Jiang, Xiaodong Zhang, Huiming Wang, Wei Duan
Product replacement gives a simple approach for code construction. This paper investigates the use of replacement product graphs for the recursive construction of QC cycle LDPC codes. It is proved that the QC cycle LDPC codes constructed by our approach are of girth 6. Simulation results show that QC cycle LDPC codes constructed by the replacement product perform well over the AWGN channel.
产品替换为代码构建提供了一种简单的方法。本文研究了替换积图在QC循环LDPC码递归构造中的应用。证明了用该方法构造的QC循环LDPC码的周长为6。仿真结果表明,由替换产品构建的QC周期LDPC码在AWGN信道上具有良好的性能。
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引用次数: 0
Deep object tracking with multi-modal data 基于多模态数据的深度目标跟踪
Xuezhi Zhang, Yuan Yuan, Xiaoqiang Lu
Object tracking is a challenging topic in the field of computer vision since its performance is easily disturbed by occlusion, illumination change, background clutter, scale variation, etc. In this paper, we introduce a robust tracking algorithm that fuses information from both visible images and infrared (IR) images. The proposed tracking algorithm not only incorporates convolutional feature maps from the visible channel, but also employs a scale pyramid representation from IR channel. We estimate the target location by fusing multilayer convolutional feature maps, and predict the target scale from a scale pyramid. The pipeline of the proposed method is as follows. First, the hierarchical convolutional feature maps are obtained from visible images using VGG-Nets. Then, the accurate target location is predicted by the maximum response of correlation filters with the visible image feature maps. Finally, we obtain the precise object scale with a scale pyramid from infrared images where the difference between the target and the background is clear. In order to verify the performance of the proposed method, we capture six video sequences under different conditions. These sequences contain both visible channel and IR channel. Ten state-of-the-art tracking algorithms are compared with our method, and the experimental results show the effectiveness of the proposed tracker.
目标跟踪是计算机视觉领域中一个具有挑战性的课题,其性能容易受到遮挡、光照变化、背景杂波、尺度变化等因素的干扰。本文介绍了一种融合可见光和红外图像信息的鲁棒跟踪算法。该跟踪算法不仅结合了可见光通道的卷积特征映射,还采用了红外通道的尺度金字塔表示。我们通过融合多层卷积特征映射来估计目标位置,并从尺度金字塔中预测目标尺度。所提方法的流程如下。首先,利用VGG-Nets对可见图像进行分层卷积特征映射;然后,利用相关滤波器对可见图像特征映射的最大响应来预测准确的目标位置。最后,从目标与背景差别明显的红外图像中,利用比例尺金字塔得到精确的目标比例尺。为了验证该方法的性能,我们在不同条件下捕获了六个视频序列。这些序列包含可见通道和红外通道。通过与十种最先进的跟踪算法进行比较,实验结果表明了所提跟踪算法的有效性。
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引用次数: 1
Advantage distillation over MIMO wiretap channels based on generalized extended orthogonal space-time block codes 基于广义扩展正交空时分组码的MIMO窃听信道优势提取
Yuwen Cao, Xueqin Jiang, Huiming Wang, Enjian Bai, Jun Li
The three-phase process of achieving secret sharing over a wiretap channel are, respectively, advantage distillation, information reconciliation, and privacy amplification. In this paper, we first generalize the extended orthogonal space time block codes (EO-STBCs). Then, based on the generalized EO-STBCs (GEO-STBCs) and the feedback bits from the legitimate receiver, we propose a new advantage distillation scheme for multiple-input multiple-output (MIMO) wiretap channels. Simulation results show that the bit error rate (BER) performance gain up to 4.2 dB is obtained by the legitimate receiver over the eavesdropper at the BER of 10-5. Moreover, it is shown that the feedback performance gain of the proposed advantage distillation scheme grows exponentially with signal-to-noise ratio (SNR).
通过窃听信道实现秘密共享的三个阶段分别是优势蒸馏、信息协调和隐私放大。本文首先对扩展正交空时分组码(eo - stbc)进行了推广。然后,基于广义eo - stbc (geo - stbc)和合法接收端反馈比特,提出了一种适用于多输入多输出(MIMO)窃听信道的优势提取方案。仿真结果表明,在误码率为10-5的情况下,合法接收机比窃听器获得了高达4.2 dB的误码率性能增益。结果表明,优势蒸馏方案的反馈性能增益随信噪比呈指数增长。
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引用次数: 4
Accuracy analysis of an impulse radio 60 GHz positioning system 脉冲无线电60ghz定位系统精度分析
Tingting Lv, H. Zhang, Xue-rong Cui, Jing Cui, T. Gulliver
The ranging and positioning accuracy of an impulse radio (IR) 60 GHz system is investigated. The corresponding Cramér-Rao lower bound (CRLB) over an additive white Gaussian noise (AWGN) channel is analyzed. The signal parameters which may affect the accuracy are examined. Performance results over AWGN and indoor residential channels are presented. In particular, the indoor residential channel models recommended by the IEEE 802.15.3c task group are employed. The theoretical and simulation results obtained show that the IR 60 GHz system can achieve millimeter accuracy in residential line-of-sight (LOS) environments even with a low signal-to-noise ratio (SNR) of 5 dB. For a residential non-line-of-sight (NLOS) environment with the same SNR, centimeter accuracy can be obtained.
研究了60 GHz脉冲无线电(IR)系统的测距定位精度。分析了加性高斯白噪声(AWGN)信道上相应的cram - rao下界(CRLB)。对可能影响精度的信号参数进行了分析。给出了在AWGN和室内住宅信道上的性能结果。其中,采用IEEE 802.15.3c任务组推荐的室内住宅信道模型。理论和仿真结果表明,即使在低信噪比(SNR)为5 dB的住宅视距(LOS)环境下,红外60 GHz系统也能达到毫米级精度。对于具有相同信噪比的住宅非视距(NLOS)环境,可以获得厘米级精度。
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引用次数: 0
Design and implementation of a new web anti-attack method based on URL randomization 基于URL随机化的web防攻击新方法的设计与实现
W. Liu, Chengrong Wu, Haolin Jin, Shiyong Zhang
Web security is an important part of information security. This paper proposes a new web anti-attack method based on URL randomization. Adding a random field in the URL leads that the attackers cannot get desired URLs through sniffing and scanning the static URLs. In the section of theoretical analysis, we analyze the probability that the attackers construct the correct URLs. Finally, we implement a prototype of the method we come up with and use it to measure the overhead the method will bring. Experiment results shows that the overhead the method brings is very little and this method has the significance of practical application.
网络安全是信息安全的重要组成部分。提出了一种基于URL随机化的web防攻击方法。在URL中加入随机字段会导致攻击者无法通过嗅探和扫描静态URL获得想要的URL。在理论分析部分,我们分析了攻击者构造正确url的概率。最后,我们实现了我们提出的方法的原型,并使用它来度量该方法将带来的开销。实验结果表明,该方法带来的开销很小,具有实际应用意义。
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引用次数: 0
期刊
2016 International Conference on Computer, Information and Telecommunication Systems (CITS)
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