A new improved group space-time block code (G-STBC) based on constellation rotation for four transmit antennas was proposed. In comparison with the traditional G-STBC coding scheme, the proposed space-time code has lo...A new improved group space-time block code (G-STBC) based on constellation rotation for four transmit antennas was proposed. In comparison with the traditional G-STBC coding scheme, the proposed space-time code has longer code length and adopts proper rotation-based symbols, which can increase the minimum distance of space-time codes and thereby improve code gain and achieve full diversity performance. The simulation results verify that the proposed group space-time code can achieve better bit error performance than both the traditional group space-time code and other quasi-orthogonal space-time codes. Compared with Ma’s full diversity full rate (FDFR) codes, the proposed space-time code also can achieve the same excellent error performance. Furthermore, the design of the new space-time code gives another new and simple method to construct space-time codes with full diversity and high rate in case that it is not easy to design the traditional FDFR space-time codes.展开更多
We know that for a code C,it‘s very important to find out the Automorphism groupAutC of C.However,it is very difficult to seek entire AutC.In this paper,using the G.I of matrices over a finite field,we give several m...We know that for a code C,it‘s very important to find out the Automorphism groupAutC of C.However,it is very difficult to seek entire AutC.In this paper,using the G.I of matrices over a finite field,we give several methods to judge whether a permutation σ∈S_n.(Symmetric group) belongs to AutC or not.They are helpful for the purpose to ex-展开更多
Two new notions for the coset partition of dyadic additive groups are proposed,andtheir sufficient and necessary conditions are also given.On the basis of these works,the feasibilityproblem of implementing minority-lo...Two new notions for the coset partition of dyadic additive groups are proposed,andtheir sufficient and necessary conditions are also given.On the basis of these works,the feasibilityproblem of implementing minority-logic decoding algorithm for RM codes is solved.展开更多
In this work, we study binary linear distinct weight codes (DW-code). We give a complete classification of -DW-codes and enumerate their equivalence classes in terms of the number of solutions of specific Diophantine ...In this work, we study binary linear distinct weight codes (DW-code). We give a complete classification of -DW-codes and enumerate their equivalence classes in terms of the number of solutions of specific Diophantine Equations. We use the Q-extension program to provide examples.展开更多
针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗...针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗干扰能力。同时针对频率捷变信号相位非相参带来的主瓣展宽和旁瓣抬高问题,设计了对应编码信号的相参处理方法。首先对回波脉压后的信号进行高分辨距离补偿,然后通过速度遍历插值和距离一致性校正实现脉组内相参处理,最后利用编码信号载频序列的优势实现脉组间相参处理。在仿真实验中,对构建的编码信号相较于LFM信号在抗干扰方面的优越性进行了验证,同时验证了所提相参处理方法相较于基于压缩感知的稀疏重构算法的有效性。展开更多
随着纠删码在分布式存储系统中的实际应用,纠删码为存储系统提供了更加优秀的存储效率,但当节点丢失时,相较于传统副本技术更多的网络传输带宽开销成为了造成系统性能瓶颈的关键因素。为了解决MDS编码高带宽开销对系统性能的影响,一类...随着纠删码在分布式存储系统中的实际应用,纠删码为存储系统提供了更加优秀的存储效率,但当节点丢失时,相较于传统副本技术更多的网络传输带宽开销成为了造成系统性能瓶颈的关键因素。为了解决MDS编码高带宽开销对系统性能的影响,一类新型编码方案——分组码被应用在分布式存储系统中,相较于传统MDS编码能够有效地降低节点修复时的数据传输量,从而减少网络带宽需求。在Pyramid分组码的基础上进行层次扩展,提出一种HLRC(hierarchical local repair codes)纠删码。HLRC相较于LRC引入了层次编码模型,将原始数据块构建为编码矩阵,根据层次进行分别编码,生成包含数据块范围不同的局部校验块;每个层次包含的数据块数量不同,可以保证修复节点时的低修复成本,同时还拥有较高的存储效率。HLRC相较于Pyramid拥有额外的校验块冗余,能够降低校验块出错和多节点出错时的恢复开销。在基于Ceph的分布式存储系统中的实验结果表明,HLRC与Pyramid等分组码相比,单节点修复开销最高可降低48.56%,多节点修复开销最高可降低25%。展开更多
In this paper, we study self-dual permutation codes over formal power series rings and finite principal ideal rings. We first give some results on the torsion codes associated with the linear codes over formal power s...In this paper, we study self-dual permutation codes over formal power series rings and finite principal ideal rings. We first give some results on the torsion codes associated with the linear codes over formal power series rings. These results allow for obtaining some conditions for non-existence of self-dual permutation codes over formal power series rings. Finally, we describe self-dual permutation codes over finite principal ideal rings by examining permutation codes over their component chain rings.展开更多
Permutation codes over finite chain rings are introduced; by using the character of the finite chain rings and the knowledge of representation of group, some conditions for existence or non-existence of self-dual perm...Permutation codes over finite chain rings are introduced; by using the character of the finite chain rings and the knowledge of representation of group, some conditions for existence or non-existence of self-dual permutation codes over finite chain rings are obtained. Specially, when the group is a direct product of a 2-group and a T-group, and the group action is transitive, the sufficient and necessary condition of the existence of permutation codes is given.展开更多
在当前卫生健康体系中,诊断相关分组(diagnosis related groups,DRG)支付模式被越来越多的国家采纳以促进医疗服务效率和质量的提升。然而,实施DRG系统的一个关键挑战是确保高准确率的病历入组,因为这直接关系医疗机构的收入与成本控制...在当前卫生健康体系中,诊断相关分组(diagnosis related groups,DRG)支付模式被越来越多的国家采纳以促进医疗服务效率和质量的提升。然而,实施DRG系统的一个关键挑战是确保高准确率的病历入组,因为这直接关系医疗机构的收入与成本控制。文章聚焦于病案信息技术人员在提高DRG入组率中的作用,探讨如何通过精准编码和数据管理提升DRG系统的效率和准确性。采用了定性研究和定量分析相结合的方法,首先通过文献回顾和专家访谈收集了关于病案信息技术人员职责与DRG系统要求的信息;然后,通过案例分析评估了病案信息技术人员在实际工作中如何识别、记录和处理影响DRG入组率的关键因素;最后,运用统计分析方法对不同干预措施的效果进行了量化评估。揭示病案信息技术人员在数据质量控制、编码准确性以及信息技术应用方面如何作用于DRG系统性能的提升。研究发现,病案信息技术人员的专业能力对于提高DRG入组率至关重要。通过精确的疾病和手术编码、及时的数据捕获以及对不一致或缺失信息的纠正,可以显著减少错误入组的情况。此外,采用先进的信息技术工具和算法可以进一步提高编码效率和准确性。跨学科合作和持续培训能够有效增强病案信息技术人员在DRG系统中的作用。文章强调了病案信息技术人员在优化DRG支付系统中的核心作用,并指出通过提升他们的专业能力和利用信息技术手段,可以显著提高DRG系统的入组准确率。这一发现对于卫生管理者和政策制定者来说具有重要价值,不仅有助于提高医疗服务质量和患者满意度,还能确保医疗资源的合理分配和利用。展开更多
The use of pan-ethnic-group products form knowledge primarily depends on a designer's subjective experience without user participation. The majority of studies primarily focus on the detection of the perceptual deman...The use of pan-ethnic-group products form knowledge primarily depends on a designer's subjective experience without user participation. The majority of studies primarily focus on the detection of the perceptual demands of consumers from the target product category. A pan-ethnic-group products form gene clustering method based on emotional semantic is constructed. Consumers' perceptual images of the pan-ethnic-group products are obtained by means of product form gene extraction and coding and computer aided product form clustering technology. A case of form gene clustering about the typical pan-ethnic-group products is investigated which indicates that the method is feasible. This paper opens up a new direction for the future development of product form design which improves the agility of product design process in the era of Industry 4.0.展开更多
Tilings of p-groups are closely associated with error-correcting codes. In [1], M. Dinitz, attempting to generalize full-rank tilings of ?Zn2??to arbitrary finite abelian groups, was able to show that if p ≥5, ...Tilings of p-groups are closely associated with error-correcting codes. In [1], M. Dinitz, attempting to generalize full-rank tilings of ?Zn2??to arbitrary finite abelian groups, was able to show that if p ≥5, then?Znp? admits full-rank tiling and left the case p=3, as an open question. The result proved in this paper the settles of the question for the case p=3.展开更多
基金National High Technology Research andDevelopment Program (863) of China( No. 003AA12331007 ) and NationalNatural Science Foundation of China(No. 60272079, 60332030)
文摘A new improved group space-time block code (G-STBC) based on constellation rotation for four transmit antennas was proposed. In comparison with the traditional G-STBC coding scheme, the proposed space-time code has longer code length and adopts proper rotation-based symbols, which can increase the minimum distance of space-time codes and thereby improve code gain and achieve full diversity performance. The simulation results verify that the proposed group space-time code can achieve better bit error performance than both the traditional group space-time code and other quasi-orthogonal space-time codes. Compared with Ma’s full diversity full rate (FDFR) codes, the proposed space-time code also can achieve the same excellent error performance. Furthermore, the design of the new space-time code gives another new and simple method to construct space-time codes with full diversity and high rate in case that it is not easy to design the traditional FDFR space-time codes.
文摘We know that for a code C,it‘s very important to find out the Automorphism groupAutC of C.However,it is very difficult to seek entire AutC.In this paper,using the G.I of matrices over a finite field,we give several methods to judge whether a permutation σ∈S_n.(Symmetric group) belongs to AutC or not.They are helpful for the purpose to ex-
文摘Two new notions for the coset partition of dyadic additive groups are proposed,andtheir sufficient and necessary conditions are also given.On the basis of these works,the feasibilityproblem of implementing minority-logic decoding algorithm for RM codes is solved.
文摘In this work, we study binary linear distinct weight codes (DW-code). We give a complete classification of -DW-codes and enumerate their equivalence classes in terms of the number of solutions of specific Diophantine Equations. We use the Q-extension program to provide examples.
文摘针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗干扰能力。同时针对频率捷变信号相位非相参带来的主瓣展宽和旁瓣抬高问题,设计了对应编码信号的相参处理方法。首先对回波脉压后的信号进行高分辨距离补偿,然后通过速度遍历插值和距离一致性校正实现脉组内相参处理,最后利用编码信号载频序列的优势实现脉组间相参处理。在仿真实验中,对构建的编码信号相较于LFM信号在抗干扰方面的优越性进行了验证,同时验证了所提相参处理方法相较于基于压缩感知的稀疏重构算法的有效性。
文摘随着纠删码在分布式存储系统中的实际应用,纠删码为存储系统提供了更加优秀的存储效率,但当节点丢失时,相较于传统副本技术更多的网络传输带宽开销成为了造成系统性能瓶颈的关键因素。为了解决MDS编码高带宽开销对系统性能的影响,一类新型编码方案——分组码被应用在分布式存储系统中,相较于传统MDS编码能够有效地降低节点修复时的数据传输量,从而减少网络带宽需求。在Pyramid分组码的基础上进行层次扩展,提出一种HLRC(hierarchical local repair codes)纠删码。HLRC相较于LRC引入了层次编码模型,将原始数据块构建为编码矩阵,根据层次进行分别编码,生成包含数据块范围不同的局部校验块;每个层次包含的数据块数量不同,可以保证修复节点时的低修复成本,同时还拥有较高的存储效率。HLRC相较于Pyramid拥有额外的校验块冗余,能够降低校验块出错和多节点出错时的恢复开销。在基于Ceph的分布式存储系统中的实验结果表明,HLRC与Pyramid等分组码相比,单节点修复开销最高可降低48.56%,多节点修复开销最高可降低25%。
文摘In this paper, we study self-dual permutation codes over formal power series rings and finite principal ideal rings. We first give some results on the torsion codes associated with the linear codes over formal power series rings. These results allow for obtaining some conditions for non-existence of self-dual permutation codes over formal power series rings. Finally, we describe self-dual permutation codes over finite principal ideal rings by examining permutation codes over their component chain rings.
基金Supported by the National Natural Science Foundation of China (60373087, 60473023, 90104005, 60673071)
文摘Permutation codes over finite chain rings are introduced; by using the character of the finite chain rings and the knowledge of representation of group, some conditions for existence or non-existence of self-dual permutation codes over finite chain rings are obtained. Specially, when the group is a direct product of a 2-group and a T-group, and the group action is transitive, the sufficient and necessary condition of the existence of permutation codes is given.
文摘在当前卫生健康体系中,诊断相关分组(diagnosis related groups,DRG)支付模式被越来越多的国家采纳以促进医疗服务效率和质量的提升。然而,实施DRG系统的一个关键挑战是确保高准确率的病历入组,因为这直接关系医疗机构的收入与成本控制。文章聚焦于病案信息技术人员在提高DRG入组率中的作用,探讨如何通过精准编码和数据管理提升DRG系统的效率和准确性。采用了定性研究和定量分析相结合的方法,首先通过文献回顾和专家访谈收集了关于病案信息技术人员职责与DRG系统要求的信息;然后,通过案例分析评估了病案信息技术人员在实际工作中如何识别、记录和处理影响DRG入组率的关键因素;最后,运用统计分析方法对不同干预措施的效果进行了量化评估。揭示病案信息技术人员在数据质量控制、编码准确性以及信息技术应用方面如何作用于DRG系统性能的提升。研究发现,病案信息技术人员的专业能力对于提高DRG入组率至关重要。通过精确的疾病和手术编码、及时的数据捕获以及对不一致或缺失信息的纠正,可以显著减少错误入组的情况。此外,采用先进的信息技术工具和算法可以进一步提高编码效率和准确性。跨学科合作和持续培训能够有效增强病案信息技术人员在DRG系统中的作用。文章强调了病案信息技术人员在优化DRG支付系统中的核心作用,并指出通过提升他们的专业能力和利用信息技术手段,可以显著提高DRG系统的入组准确率。这一发现对于卫生管理者和政策制定者来说具有重要价值,不仅有助于提高医疗服务质量和患者满意度,还能确保医疗资源的合理分配和利用。
基金Supported by National Key Technology R&D Program,China(Grant No.2015BAH21F01)National 111 Project,China(Grant No.B13044)
文摘The use of pan-ethnic-group products form knowledge primarily depends on a designer's subjective experience without user participation. The majority of studies primarily focus on the detection of the perceptual demands of consumers from the target product category. A pan-ethnic-group products form gene clustering method based on emotional semantic is constructed. Consumers' perceptual images of the pan-ethnic-group products are obtained by means of product form gene extraction and coding and computer aided product form clustering technology. A case of form gene clustering about the typical pan-ethnic-group products is investigated which indicates that the method is feasible. This paper opens up a new direction for the future development of product form design which improves the agility of product design process in the era of Industry 4.0.
文摘Tilings of p-groups are closely associated with error-correcting codes. In [1], M. Dinitz, attempting to generalize full-rank tilings of ?Zn2??to arbitrary finite abelian groups, was able to show that if p ≥5, then?Znp? admits full-rank tiling and left the case p=3, as an open question. The result proved in this paper the settles of the question for the case p=3.