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Distinction of self-synchronous scrambled linear blockcodes based on multi-fractal spectrum 认领 引用 被引量：4
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作者 xinhao li min zhang +1 位作者 shu'nan han quan yuan 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2016年第5期968-978,共11页
This study proposes a novel multi-fractal spectrumbasedapproach to distinguish linear block codes from its selfsynchronousscrambled codes. Given that the linear block codeand self-synchronous scrambled linear block co... This study proposes a novel multi-fractal spectrumbasedapproach to distinguish linear block codes from its selfsynchronousscrambled codes. Given that the linear block codeand self-synchronous scrambled linear block code share the propertyof linear correlation, the existing linear correlation-basedidentification method is invalid for this case. This drawback can becircumvented by introducing a novel multi-fractal spectrum-basedmethod. Simulation results show that the new method has highrobustness and under the same conditions of bit error, the lowerthe code rate, the higher the recognition rate. Thus, the methodhas significant potential for future application in engineering. 展开更多
关键词 linear block code self-synchronous scrambled code,multi-fractal spectrum statistical physics algorithm.
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Study on the aided PC-ASCL decoding algorithm based on optimized parity check codes 认领 引用
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作者 Jianguo YUAN Deyi YANG +1 位作者 Ziliang ZHU Jinneng XIANG 《Optoelectronics Letters》 EI 2026年第2期87-91,共5页
Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity chec... Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity check(OPC) code which can verify all odd errors as well as the half even errors is proposed. The OPC code is used to improve the PC-ASCL decoding algorithm, thus an OPC aided ASCL(OPC-ASCL) decoding algorithm is proposed. In the coding stage, the algorithm divides the information sequence into multiple segments, and places an OPC code at the end of each segment to verify the current information sequence, and places a cyclic redundancy check code at the end of the entire information sequence to verify the entire information sequence. In the decoding stage, the algorithm uses the OPC-ASCL decoder to decode. Simulation results show that compared to the PC-ASCL decoding algorithm, the OPC-ASCL decoding algorithm can reduce the complexity and obtain the certain performance gain. 展开更多
关键词 pc ascl decoding pc code adaptive successive cancellation list pc ascl divides information sequence multip parity check polar code optimized parity check coding stage
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An empirical study on cross-phase code modification behaviors in incremental programming projects 认领 引用
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作者 Jing Jiang Chenhong Ji +1 位作者 Li Zhang Haiyan Yang 《计算机教育》 2026年第6期280-291,共12页
This paper conducts an empirical study on students'code modification behaviors in incremental programming projects by analyzing 40771 code submissions from 371 students through abstract syntax tree(AST)difference ... This paper conducts an empirical study on students'code modification behaviors in incremental programming projects by analyzing 40771 code submissions from 371 students through abstract syntax tree(AST)difference analysis and manual annotation.The study investigates the distribution of code modification types to prior-phase code during iterative development,identifies cross-phase error types,and analyzes refactoring strategies.The findings reveal that error correction and code refactoring constitute the primary types of cross-phase code modifications.Among cross-phase latent errors,special case neglect represents the dominant error type,indicating insufficient coverage of special scenarios in existing test suites.Variable renaming emerges as the most prevalent refactoring behavior,reflecting students'emphasis on code readability.These research findings provide empirical evidence for optimizing incremental curriculum design,improving test cases,and cultivating students'code maintenance capabilities in programming education. 展开更多
关键词 Incremental projects Code modification Error correction Code refactoring Computer science education
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On Some Dually-BCH Codes 认领 引用
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作者 Pu Keli Liao Qunying 《Journal of Mathematical Research with Applications》 CSCD 2026年第4期465-480,共16页
Bose-Chaudhuri-Hocquenghem(BCH)codes have wide applications in communication and storage.In this article,for given BCH code C(q,n,δ,b)(b=0,1)with respect to β of length n=qm+1,we present several sufficient con... Bose-Chaudhuri-Hocquenghem(BCH)codes have wide applications in communication and storage.In this article,for given BCH code C(q,n,δ,b)(b=0,1)with respect to β of length n=qm+1,we present several sufficient conditions for C(q,n,δ,b)(b=0,1)to be dually-BCH or not,respectively.Especially,for some designed distance δ,we determine the parameters of the narrow-sense BCH code C(q,q2+1,δ,1),and for q=2l with l≥2,we provide a sufficient condition for C(q,q2+1,δ,0) dually-BCH and determine the parameters of both C(q,q2+1,δ,0) and the dual. 展开更多
关键词 BCH code dual code dually-BCH code cyclotomic coset
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New binary quantum stabilizer codes from classical quasi-cyclic codes of index two 认领 引用
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作者 Zhen-Hui Zhang Zhuo Li Li-Juan Xing 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期253-264,共12页
We study the algebraic structures of a generalized class of quasi-cyclic codes of index two,and prove that any quasicyclic code of index two can be transformed into our proposed quasi-cyclic codes.We determine the gen... We study the algebraic structures of a generalized class of quasi-cyclic codes of index two,and prove that any quasicyclic code of index two can be transformed into our proposed quasi-cyclic codes.We determine the generator forms of the proposed quasi-cyclic codes and their Hermitian dual codes.We establish the necessary and sufficient conditions for Hermitian self-orthogonality and dual-containing property to construct quantum stabilizer codes via the Hermitian construction method.As an application,10 record-breaking quantum stabilizer codes are constructed. 展开更多
关键词 quasi-cyclic codes quantum stabilizer codes Hermitian inner product Hermitian construction
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Quantum toric code decoding method based on syndrome-preliminary error fusion module and ResNet architecture 认领 引用
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作者 Nai-Hua Ji Ping-Li Song +2 位作者 Wei Wang Hui-Qian Sun Hong-Yang Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第6期649-659,共11页
Quantum error correction technology is based on the principle of redundant encoding,encoding logical quantum information into multiple physical qubits to provide important support for the stable operation of quantum c... Quantum error correction technology is based on the principle of redundant encoding,encoding logical quantum information into multiple physical qubits to provide important support for the stable operation of quantum computers.To address the issues of low decoding accuracy and limited feature extraction in quantum error correction,this paper proposes a toric code decoder based on a syndrome-preliminary error fusion module(SPEFM)and a ResNet architecture.This decoder takes full advantage of the correlations between X and Z errors.In the SPEFM,the syndrome and preliminary error predictions are deeply fused,while a unidirectional Swin transformer architecture is incorporated to extract global error features from the syndrome data,signiffiificantly improving both decoding accuracy and computational efffiificiency.In addition,this paper further extracts local error features from the fused features using the deep residual structure of ResNet,enhancing the decoder's ability to capture quantum error patterns.Experimental results show that the decoder is applicable to different code distances(d=4,6,8,10)under the depolarizing noise model.Its bit error rate is lower than that of the minimum weight perfect matching(MWPM)algorithm,and its logical error rate is lower than both the MWPM algorithm and the ResNet18 decoder.Furthermore,the decoding threshold is increased to 0.163,representing a 3.82%improvement over the MWPM algorithm threshold of 0.157. 展开更多
关键词 quantum error correction toric code ResNet Swin transformer
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Integrating Attention Mechanism with Code Structural Affinity and Execution Context Correlation for Automated Bug Repair 认领 引用
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作者 Jinfeng Ji Geunseok Yang 《Computers, Materials & Continua》 SCIE EI 2026年第3期1708-1725,共18页
Automated Program Repair(APR)techniques have shown significant potential in mitigating the cost and complexity associated with debugging by automatically generating corrective patches for software defects.Despite cons... Automated Program Repair(APR)techniques have shown significant potential in mitigating the cost and complexity associated with debugging by automatically generating corrective patches for software defects.Despite considerable progress in APR methodologies,existing approaches frequently lack contextual awareness of runtime behaviors and structural intricacies inherent in buggy source code.In this paper,we propose a novel APR approach that integrates attention mechanisms within an autoencoder-based framework,explicitly utilizing structural code affinity and execution context correlation derived from stack trace analysis.Our approach begins with an innovative preprocessing pipeline,where code segments and stack traces are transformed into tokenized representations.Subsequently,the BM25 ranking algorithm is employed to quantitatively measure structural code affinity and execution context correlation,identifying syntactically and semantically analogous buggy code snippets and relevant runtime error contexts from extensive repositories.These extracted features are then encoded via an attention-enhanced autoencoder model,specifically designed to capture significant patterns and correlations essential for effective patch generation.To assess the efficacy and generalizability of our proposed method,we conducted rigorous experimental comparisons against DeepFix,a state-of-the-art APR system,using a substantial dataset comprising 53,478 studentdeveloped C programs.Experimental outcomes indicate that our model achieves a notable bug repair success rate of approximately 62.36%,representing a statistically significant performance improvement of over 6%compared to the baseline.Furthermore,a thorough K-fold cross-validation reinforced the consistency,robustness,and reliability of our method across diverse subsets of the dataset.Our findings present the critical advantage of integrating attentionbased learning with code structural and execution context features in APR tasks,leading to improved accuracy and practical applicability.Future work aims to extend the model’s applicability across different programming languages,systematically optimize hyperparameters,and explore alternative feature representation methods to further enhance debugging efficiency and effectiveness. 展开更多
关键词 Automated bug repair autoencoder algorithm buggy code analysis stack trace similarity machine learning for debugging
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Improving MCUCN code to simulate ultracold neutron storage and transportation in superfluid4He 认领 引用
8
作者 Xue-Fen Han Fei Shen +6 位作者 Bin Zhou Xiao-Xiao Cai Tian-Cheng Yi Zhi-Liang Hu Song-Lin Wang Tian-Jiao Liang Robert Golub 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第3期235-246,共12页
The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and ... The ultracold neutron(UCN)transport code,MCUCN,designed initially for simulating UCN transportation from a solid deuterium(SD_2)source and neutron electric dipole moment experiments,could not simulate UCN storage and transportation in a superfluid4He(SFHe,He-Ⅱ)source accurately.This limitation arose from the absence of an4He upscattering mechanism and the absorption of3He.And the provided source energy distribution in MCUCN is different from that in SFHe source.This study introduced enhancements to MCUCN to address these constraints,explicitly incorporating the4He upscattering effect,the absorption of3He,the loss caused by impurities on converter wall,UCN source energy distribution in SFHe,and the transmission through negative optical potential.Additionally,a Python-based visualization code for intermediate states and results was developed.To validate these enhancements,we systematically compared the simulation results of the Lujan Center Mark3 UCN system by MCUCN and the improved MCUCN code(iMCUCN)with UCNtransport simulations.Additionally,we compared the results of the SUN1 system simulated by MCUCN and iMCUCN with measurement results.The study demonstrates that iMCUCN effectively simulates the storage and transportation of ultracold neutrons in He-Ⅱ. 展开更多
关键词 Ultracold neutron Storage Transportation Improved MCUCN code Upscattering effect Absorption by3He
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Erratum:“Data-driven Simulations of Magnetic Field Evolution in Active Region 11429:Magneto-frictional Method Using PENCIL CODE”(2024,RAA,24,025007) 认领 引用
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作者 P.Vemareddy Jön Warnecke Ph.A.Bourdin 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第3期293-293,共1页
On page 6,Figure 3 is a duplicate of Figure 4.We publish below the correct figure,sincerely apologizing to the authors.
关键词 magnetic field evolution magneto frictional method pencil code erratum figure duplication apology active region
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Genomic insights into the survival code of karst plants 认领 引用
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作者 Xiongfang Liu Yongpeng Ma 《Plant Diversity》 SCIE CAS CSCD 2026年第2期227-230,共4页
Karst landscapes are developed on soluble rocks(primarily limestone),covering about 10-15%of Earth’s ice-free land surface(Ford and Williams,2007).Their unique geological properties have given rise to complex,heterog... Karst landscapes are developed on soluble rocks(primarily limestone),covering about 10-15%of Earth’s ice-free land surface(Ford and Williams,2007).Their unique geological properties have given rise to complex,heterogeneous,and“island-like”habitats that,combined with periodic drought,high calcium,and lownutrient stresses,foster high species diversity and endemism(Clements et al.,2006;Hao et al.,2015;Oliver et al.,2017;Monro et al.,2018).These conditions make karst ecosystems ideal“natural laboratories”for studying speciation and adaptive evolution(Clements et al.,2006;Oliver et al.,2017). 展开更多
关键词 soluble rocks soluble rocks primarily karst ecosystems genomic insights survival code karst plants limestone ice free land surface
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Methods,Algorithms,Codes,and Software for Theoretical and Computational Chemistry 认领 引用
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作者 Bin Jiang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第3期301-302,共2页
Theoretical and computational chemistry has profoundly impacted a wide range of disciplines,from chemistry and physics to biology and materials science.In recent years,remarkable advances in electronic structure theor... Theoretical and computational chemistry has profoundly impacted a wide range of disciplines,from chemistry and physics to biology and materials science.In recent years,remarkable advances in electronic structure theory,molecular dynamics,and machine learning methods——coupled with increasingly powerful algorithms and software—have equipped chemists with an unprecedented arsenal of tools to tackle complex chemical problems. 展开更多
关键词 theoretical computational chemistry electronic structure theorymolecular dynamicsand algorithms codes software methods materials sciencein theoretical chemistry
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A Novel Progressive Edge Growth-Based Codebook Design for SCMA Systems 认领 引用
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作者 Lei Tuofeng Ni Shuyan +2 位作者 Luo Qu Chen Shimiao Xiao Pei 《China Communications》 SCIE EI CSCD 2025年第6期116-130,共15页
This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource ... This paper proposes a class of novel progressive edge growth-based codebooks for downlink sparse code multiple access(SCMA)systems.In the first scheme,we propose to progressively design the codebooks of each resource node(RN)instead of rotating a mother constellation(MC)as in the conventional SCMA works.In the other one,based on the MC,a multi-resources rotated codebooks are proposed to improve the performance of the superimposed constellations.The resultant codebooks are respectively referred to as the resource edge multidimensional codebooks(REMC)and the user edge multi-dimensional codebooks(UEMC).Additionally,we delve into the detailed design of the MC and the superimposed constellation.Then,we pay special attention to the application of the proposed schemes to challenging design cases,particularly for the high dimensional,high rate,and irregular codebooks,where the corresponding simplified schemes are proposed to reduce the complexity of codebook design.Finally,simulation results are presented to demonstrate the superiority of our progressive edge growth-based schemes.The numerical results indicate that the proposed codebooks significantly outperform the stateof-the-art codebooks.In addition,we also show that the proposed REMC codebooks outperform in the lower signal-to-noise ratio(SNR)regime,whereas the UEMC codebooks exhibit better performance at higher SNRs. 展开更多
关键词 codebook design resource edge multidimensional codebooks(REMC) sparse code multiple access(SCMA) symbol error performance user edge multi-dimensional codebooks(UEMC)
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Open-set blind recognition of non-binary LDPC codes 认领 引用 被引量：1
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作者 Ming Jiang Dongrui Huan +1 位作者 Shiqiu Liu Junhui Zhao 《Digital Communications and Networks》 SCIE EI CSCD 2026年第5期836-844,共9页
Blind encoder recognition methods have drawn much research interest in recent years,as they can play an important role in non-cooperative scenarios.This paper proposes an open-set blind recognition method for nonbinar... Blind encoder recognition methods have drawn much research interest in recent years,as they can play an important role in non-cooperative scenarios.This paper proposes an open-set blind recognition method for nonbinary Low-Density Parity-Check(LDPC)codes with high performance.We derive the principle of obtaining a non-binary Parity-Check Matrix(PCM)from the received signal and further apply the Gauss-Jordan Column Elimination(GJCE)over GF(q).An iterative process involving GJCE,LDPC decoding,and PCM sparsification is applied in our proposed method.The proposed symbol-level blind recognition is shown to perform much better than the bit-level one.Experimental results demonstrate that our proposed method can completely reconstruct the PCMs at a bit error rate of 0.4%for the moderate-length non-binary LDPC codes. 展开更多
关键词 Blind recognition Symbol-level Open-set Non-binary LDPC codes
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Integration of Large Language Models(LLMs)and Static Analysis for Improving the Efficacy of Security Vulnerability Detection in Source Code 认领 引用 被引量：1
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作者 José Armando Santas Ciavatta Juan Ramón Bermejo Higuera +3 位作者 Javier Bermejo Higuera Juan Antonio Sicilia Montalvo Tomás Sureda Riera Jesús Pérez Melero 《Computers, Materials & Continua》 SCIE EI 2026年第3期351-390,共40页
As artificial Intelligence(AI)continues to expand exponentially,particularly with the emergence of generative pre-trained transformers(GPT)based on a transformer’s architecture,which has revolutionized data processin... As artificial Intelligence(AI)continues to expand exponentially,particularly with the emergence of generative pre-trained transformers(GPT)based on a transformer’s architecture,which has revolutionized data processing and enabled significant improvements in various applications.This document seeks to investigate the security vulnerabilities detection in the source code using a range of large language models(LLM).Our primary objective is to evaluate the effectiveness of Static Application Security Testing(SAST)by applying various techniques such as prompt persona,structure outputs and zero-shot.To the selection of the LLMs(CodeLlama 7B,DeepSeek coder 7B,Gemini 1.5 Flash,Gemini 2.0 Flash,Mistral 7b Instruct,Phi 38b Mini 128K instruct,Qwen 2.5 coder,StartCoder 27B)with comparison and combination with Find Security Bugs.The evaluation method will involve using a selected dataset containing vulnerabilities,and the results to provide insights for different scenarios according to the software criticality(Business critical,non-critical,minimum effort,best effort)In detail,the main objectives of this study are to investigate if large language models outperform or exceed the capabilities of traditional static analysis tools,if the combining LLMs with Static Application Security Testing(SAST)tools lead to an improvement and the possibility that local machine learning models on a normal computer produce reliable results.Summarizing the most important conclusions of the research,it can be said that while it is true that the results have improved depending on the size of the LLM for business-critical software,the best results have been obtained by SAST analysis.This differs in“NonCritical,”“Best Effort,”and“Minimum Effort”scenarios,where the combination of LLM(Gemini)+SAST has obtained better results. 展开更多
关键词 AI+SAST secure code LLM benchmarking LLM vulnerability detection
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Rateless Polar Codes with Unequal Error Protection Property 认领 引用
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作者 Cui Chen Xiang Wei +1 位作者 Ma Siwei Guo Qing 《China Communications》 SCIE EI CSCD 2026年第1期10-23,共14页
Mobile communications are reaching out to every aspect of our daily life,necessitating highefficiency data transmission and support for diverse data types and communication scenarios.Polar codes have emerged as a prom... Mobile communications are reaching out to every aspect of our daily life,necessitating highefficiency data transmission and support for diverse data types and communication scenarios.Polar codes have emerged as a promising solution due to their outstanding error-correction performance and low complexity.Unequal error protection(UEP)involves nonuniform error safeguarding for distinct data segments,achieving a fine balance between error resilience and resource allocation,which ultimately enhancing system performance and efficiency.In this paper,we propose a novel class of UEP rateless polar codes.The codes are designed based on matrix extension of polar codes,and elegant mapping and duplication operations are designed to achieve UEP property while preserving the overall performance of conventional polar codes.Superior UEP performance is attained without significant modifications to conventional polar codes,making it straightforward for compatibility with existing polar codes.A theoretical analysis is conducted on the block error rate and throughput efficiency performance.To the best of our knowledge,this work provides the first theoretical performance analysis of UEP rateless polar codes.Simulation results show that the proposed codes significantly outperform existing polar coding schemes in both block error rate and throughput efficiency. 展开更多
关键词 matrix extension polar codes rateless coding unequal error protection
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Efficient Polar Codes with Low Complexity for Correcting Insertions/Deletions in DPPM 认领 引用
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作者 Li Leran Liu Yuan +2 位作者 Yuan Ye Xiahou Wenqian Chen Maonan 《China Communications》 SCIE EI CSCD 2026年第1期24-33,共10页
Differential pulse-position modulation(DP PM)can achieve a good compromise between power and bandwidth requirements.However,the output sequence has undetectable insertions and deletions.This paper proposes a successiv... Differential pulse-position modulation(DP PM)can achieve a good compromise between power and bandwidth requirements.However,the output sequence has undetectable insertions and deletions.This paper proposes a successive cancellation(SC)decoding scheme based on the weighted levenshtein distance(WLD)of polar codes for correcting insertions/deletions in DPPM systems.In this method,the WLD is used to calculate the transfer probabilities recursively to obtain likelihood ratios,and the low-complexity SC decoding method is built according to the error characteristics to match the DPPM system.Additionally,the proposed SC decoding scheme is extended to list decoding,which can further improve error correction performance.Simulation results show that the proposed scheme can effectively correct insertions/deletions in the DPPM system,which enhances its reliability and performance. 展开更多
关键词 DPPM insertions/deletions polar codes SC decoding
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Impact of flex power on inter-and intra-differential code bias variation 认领 引用
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作者 Jiayu Li Yan Xiang +1 位作者 Chengeng Su Xiaolin Jia 《Geodesy and Geodynamics》 EI CSCD 2026年第2期154-167,共14页
Differential Code Bias(DCB)is the time delays between two different GNSS signals,which is crucial for GNSS positioning.Previous studies have shown that it can be significantly affected by the flex power operations in ... Differential Code Bias(DCB)is the time delays between two different GNSS signals,which is crucial for GNSS positioning.Previous studies have shown that it can be significantly affected by the flex power operations in satellites.This study proposes a 15-min short-term DCB estimation method to analyze flex power's impact on DCB variations.The method jointly estimates satellite DCB,receiver DCB,and ionospheric parameters using over 300 MGEX stations.We examined three representative flex power events in 2024,achieving average internal RMS values of 0.042 ns and 0.0068 ns for inter-frequency and intra-frequency scenarios respectively.Results show that intra-frequency DCB exhibits clear shift biases synchronized with flex power state transitions while maintaining stability within 0.20 ns during nontransition periods.No definitive impact on inter-frequency DCB was observed at current estimation precision levels. 展开更多
关键词 Differential code bias Flex power GNSS
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Two Bit-Serial Architectures for Check Node Update in Min-Sum Decoding of LDPC Codes 认领 引用
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作者 Hu Qing He Xuan +2 位作者 Luo Lisha Cai Kui Tang Xiaohu 《China Communications》 SCIE EI CSCD 2026年第3期142-150,共9页
Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffe... Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffer from decoding performance degradation,large hardware areas,and/or long latency.In this paper,we propose two efficient CN update functions based on the MV and an approximate second MV,and design bit-serial architectures to implement them.Simulation results show that our functions exhibit the minimum decoding performance degradation compared to the existing functions using approximate second MVs.Moreover,the applicationspecific integrated circuits(ASIC)implementation results demonstrate the advantages of our architectures in terms of area,latency,etc. 展开更多
关键词 bit-serial check node update hardware implementation LDPC code min-sum algorithm
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Programmable phase-coded microwave signal generation with tunable duty cycle via bias voltage modulation in an optoelectronic oscillator 认领 引用
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作者 Hang Xiao Di Peng +6 位作者 Ya Han Heyun Tan Jianping Li Meng Xiang Songnian Fu Shuoyang Qiu Yuwen Qin 《Advanced Photonics Nexus》 CSCD 2026年第3期167-175,共9页
Key parameters of microwave signals,including frequency,phase noise,period,and pulse width,exert a profound influence on the detection performance of radar systems.Optoelectronic oscillators(OEOs)offer the distinct ad... Key parameters of microwave signals,including frequency,phase noise,period,and pulse width,exert a profound influence on the detection performance of radar systems.Optoelectronic oscillators(OEOs)offer the distinct advantage of enabling direct generation of microwave signals with frequency-independent ultra-low phase noise.By integrating external modulation mechanisms,OEOs can further produce signals with more complex waveforms,thereby effectively addressing the demanding requirements of modern radar systems.We propose and demonstrate a method for generating programmable phase-coded microwave signals with tunable duty cycles in an OEO.The approach utilizes simple bias voltage modulation,where a voltage-level-coded signal is injected into the direct-current bias port of the push-pull Mach–Zehnder modulator(MZM)within the OEO loop.Binary phase coding is achieved by exploiting the reverse-phase characteristic of the minimum transmission point of the MZM.The duty cycle of the generated phase-coded microwave signal is adjusted by varying that of the injected signal.Simulations and experiments confirm the generation of microwave signals with excellent phase-coding performance and high spectral coherence. 展开更多
关键词 optoelectronic oscillator phase code tunable duty cycle radar ranging
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DAYU3D:a modern code for HTGR thermal-hydraulic design and accident analysis 认领 引用
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作者 Hao-Jie Zhang Yu-Tong Wen +2 位作者 Ding She Yan-Hua Zheng Lei Shi 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第5期345-360,共16页
DAYU3D is a modern three-dimensional(3D)computer code for thermal-hydraulic design and accident analysis in hightemperature gas-cooled reactors(HTGRs),developed by the Institute of Nuclear and New Energy Technology(IN... DAYU3D is a modern three-dimensional(3D)computer code for thermal-hydraulic design and accident analysis in hightemperature gas-cooled reactors(HTGRs),developed by the Institute of Nuclear and New Energy Technology(INET)at Tsinghua University.Compared to the traditional codes like TINTE,the DAYU3D code has advantages due to its refined framework,improved models,and more efficient algorithms.It is able to simulate the continuous movement of control rods and is more rigorous in treating radiation heat transfer and the break mass flow.Advanced computational methods significantly improve the computational efficiency of DAYU3D,achieving a time reduction of over 60%compared to TINTE.Extensive verification and validation with more than 100 cases demonstrate that DAYU3D is promising for HTGR 3D thermal-hydraulic design and accident analyses. 展开更多
关键词 High-temperature gas-cooled reactor Thermal-hydraulic design and accident analysis code Three-dimensional DAYU3D
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