检索结果-南通市图书馆

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于帧交错的LDPC译码器流水结构设计

电子科技大学学报 2024年第2期53卷 194-200页

作者：韩国军杨伟泽叶震亮翟雄飞史治平广东工业大学信息工程学院广州510006

低密度奇偶校验码(LDPC)的译码器通常采用基于节点置信度更新迭代的算法,这种算法可以并行实现,具有非常高的吞吐量。在此提出了一种具有高硬件利用效率(HUE)的帧交错译码结构,并提供了一种用于层内节点重排序的动态规划方法,解决内存... 详细信息

低密度奇偶校验码(LDPC)的译码器通常采用基于节点置信度更新迭代的算法,这种算法可以并行实现,具有非常高的吞吐量。在此提出了一种具有高硬件利用效率(HUE)的帧交错译码结构,并提供了一种用于层内节点重排序的动态规划方法,解决内存访问冲突问题。与现有的结构相比,该结构可以实现更高的硬件利用效率。

关键词：帧交错低密度奇偶校验码内存访问冲突节点重排序

Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems

在线全文

学校读者我要写书评

暂无评论

China Communications 2010年第5期7卷 103-111页

作者： Xiao Shanghui Zhang Zhongpei shi zhiping National Key Lab of Communication University of Electronic Science and Technology of China Chengdu 611731 P. R. China School of Physics and Electronic Engineering Yibin University Yibin 644007 P. R. China National Mobile Communications Research Lab Southeast University Nanjing 211189 P. R. China

Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback.

关键词： overhead reduction clustering approa-ches supercell MIMO ss stems cooperative com-munication

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

线性分组码的GRAND算法研究

移动通信 2024年第5期48卷 49-54页

作者：史治平杨娟李坤阳王玥电子科技大学通信抗干扰全国重点实验室四川成都611731 桂林航天工业学院广西桂林541004

随着5G通信技术的发展与应用,高可靠低时延通信场景下的短包信道编译码技术受到了广泛关注。GRAND是一种通用的最大似然译码算法,与传统译码算法不同,GRAND算法通过噪声猜测和码本查询来确定发送码字,具有高效的硬件实现结构。介绍了GR... 详细信息

随着5G通信技术的发展与应用,高可靠低时延通信场景下的短包信道编译码技术受到了广泛关注。GRAND是一种通用的最大似然译码算法,与传统译码算法不同,GRAND算法通过噪声猜测和码本查询来确定发送码字,具有高效的硬件实现结构。介绍了GRAND及其改进算法的基本原理,通过仿真分析了不同GRAND算法的误码率性能;针对5G NR的LDPC短码以及PAC短码给出了GRAND算法的设计方案,为未来移动通信的短码设计提供参考。

关键词：短码 GRAND算法线性分组码

维普期刊数据库博看期刊

Combat data shift in few-shot learning with knowledge graph

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第1期17卷 101-111页

作者： Yongchun ZHU Fuzhen ZHUANG Xiangliang ZHANG Zhiyuan QI zhiping shi Juan CAO Qing HE Key Lab of Intelligent Information Processing of Chinese Academy of Sciences(CAS) Institute of Computing TechnologyCASBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Institute of Artificial Intelligence Beihang UniversityBeijing 100191China Xiamen Institute of Data Intelligence Xiamen 361021China Computer Science and Engineering University of Notre DameIN 46556USA University of California San Diego La JollaCA 92093USA College of Information Engineering&Academy for Multidisciplinary Studies Capital Normal UniversityBeijing 100089China

Many few-shot learning approaches have been designed under the meta-learning framework, which learns from a variety of learning tasks and generalizes to new tasks. These meta-learning approaches achieve the expected performance in the scenario where all samples are drawn from the same distributions (i.i.d. observations). However, in real-world applications, few-shot learning paradigm often suffers from data shift, i.e., samples in different tasks, even in the same task, could be drawn from various data distributions. Most existing few-shot learning approaches are not designed with the consideration of data shift, and thus show downgraded performance when data distribution shifts. However, it is non-trivial to address the data shift problem in few-shot learning, due to the limited number of labeled samples in each task. Targeting at addressing this problem, we propose a novel metric-based meta-learning framework to extract task-specific representations and task-shared representations with the help of knowledge graph. The data shift within/between tasks can thus be combated by the combination of task-shared and task-specific representations. The proposed model is evaluated on popular benchmarks and two constructed new challenging datasets. The evaluation results demonstrate its remarkable performance.

关键词： few-shot data shift knowledge graph

Observer-based Passive Control for Neutral Type Descriptor Markovian Jump Systems

在线全文

学校读者我要写书评

暂无评论

Observer-based Passive Control for Neutral Type Descriptor M...

Blue emitting CsPbBr3 perovskite quantum dot inks obtained from sustained release tablets

第36届中国控制会议

作者： Chunjiao Wang Yuechao Ma zhiping shi Institute of Electrical Engineering Yanshan University College of Science Yanshan University State Grid LiaoNing Electric Power Co.Ltd Branch Materials

ISBN: (纸本)9781538629185

The problem of delay-dependent observer-based robustly passive control is addressed for neutral type descriptor Markov jump systems with time-varying delays. The parameter uncertainties of the system are assumed unknown and norm-bounded. Using Lyapunov-Krasovskii functional method and weighted matrix, a delay-dependent robustly passive condition for closed-loop system is given. Then, the sufficient conditions for the existence of designed observer are presented in terms of linear matrix inequalities（LMI）, and the parameters of controller are provided with the algorithm to solve the problem. Finally, a numerical example is presented to illustrate the validity of the approach.

关键词： neutral type descriptor systems Markov jump delay-dependent passive control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nano Research 2019年第12期12卷 3129-3134页

作者： Hewei Yang Yaqing Feng Zhiyu Tu Kuo Su Xiaozhi Fan Bingjie Liu zhiping shi Yuzhe Zhang Chenyang Zhao Bao Zhan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China School of Life Sciences Tianjin UniversityTianjin 300072China

Blue emitting perovskite ink obtained from cesium lead halide quantum dots bearing chlorine(CsPbClxBr3-x,0 详细信息

Blue emitting perovskite ink obtained from cesium lead halide quantum dots bearing chlorine(CsPbClxBr3-x,0shift of emission wavelength to blue ***,by polymerizing acrylamide under UV-light irradiation to form polymer gel networks in dimethyl sulfoxide(DMSO)with CsPbBr3 precursors and passivating agents trapped,wesuccessfully prepared novel sustained release tablets with different shapes and *** to the limitation of the polymer networks onsolve nt releasi ng,the resulting CsPbBr3 qua ntum dots have the average size of 1.1±0.2 *** the basis of the excelle nt quantum confin eme nteffect and optimized surface passivation,the obtained PQD ink can emit high quality blue light for more than 6 *** work elucidates anew and convenient technique to prepare blue emission perovskite quantum dots ink with high stability and photoluminescence qua ntumyield and provides a great potential technology for the preparation of perovskite optoelectronic devices.

关键词： sustained release tablet perovskite quantum dot blue emitting perovskite ink polymer gel surface passivation

HIHO Decoding Algorithms of Turbo Product Codes for High Rate Optical Communications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2012年第6期9卷 114-123页

作者： shi zhiping Zhou Liang Fan Xiang Yang Yang National Key Laboratory of Science and Technology on Communications University of Electronic Science andTechnology of ChinaChengdu 611731P.R.China

This paper presents a new Hard-Input Hard-Output (HIHO) iterative decoding algorithm for Turbo Product Codes (TPC), and especially describes the BCH-TPC codes aiming to alleviate error propagation and lower error floor. This algorithm mainly emp hasizes a decision mechanism for bit-flips, which thoroughly evaluates four different aspects of the decoding process, properly weighs and combines their respective reliability measures, and then employs the combined measure to make a judgment with regard to whether any particular bit should be flipped or not. Simulations result in a very steep Bit Error Rate (BER) curve indicating that a high-level net coding gain can be expected with a reasonable complexity. The simplicity and effectiveness of this HIHO decoding algorithm makes it a p romising candidate for the application in future high-speed fiber optical communications.

关键词： turbo product codes HIHO decodingalgorithm reliability measurement threshold selec-tion op tical communication

在线全文

学校读者我要写书评

暂无评论

基于自组织动态神经网络的图像分割

计算机研究与发展 2009年第1期46卷 23-30页

作者：史春奇施智平刘曦史忠植中国科学院计算技术研究所智能信息处理实验室北京100190 中国科学院研究生院北京100049

图像分割是图像处理和模式识别的重要课题,而图像特征空间聚类是图像分割的一种重要方法,认为图像的特征是图像中待分割物体表面所特有而且恒定的特征,并将图像的特征映射到某种几何空间,称为特征空间,并且假定图像中不同的待分割物体... 详细信息

图像分割是图像处理和模式识别的重要课题,而图像特征空间聚类是图像分割的一种重要方法,认为图像的特征是图像中待分割物体表面所特有而且恒定的特征,并将图像的特征映射到某种几何空间,称为特征空间,并且假定图像中不同的待分割物体在该特征空间中呈现为不同的聚集.提出了自组织动态网络(SODNN)聚类算法,并且利用该算法对图像特征空间聚类.该算法实现了神经网络结构的快速生长和动态调节,具有自动适应数据内在分布特征和聚类结果更为准确稳定的特点.利用SODNN算法对图像颜色空间进行聚类的同时综合了图像的位置信息来实现图像分割.实验表明分割结果与人工分割结果具有较好的一致性.

关键词：竞争学习自组织特征空间聚类图像分割图像特征

Analysis of Abnormal Seat Belt Shoulder Force Under the Front Collision Conditions

在线全文

学校读者我要写书评

暂无评论

Analysis of Abnormal Seat Belt Shoulder Force Under the Fron...