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Implementable Strategy Research of Brake Energy Recovery Based on Dynamic Programming Algorithm for a Parallel Hydraulic Hybrid Bus 被引量:6
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作者 Zhong-Liang Zhang Jie Chen 《International Journal of Automation and computing》 EI CSCD 2014年第3期249-255,共7页
The purpose of this paper is to develop an implementable strategy of brake energy recovery for a parallel hydraulic hybrid bus. Based on brake process analysis, a dynamic programming algorithm of brake energy recovery... The purpose of this paper is to develop an implementable strategy of brake energy recovery for a parallel hydraulic hybrid bus. Based on brake process analysis, a dynamic programming algorithm of brake energy recovery is established. And then an implementable strategy of brake energy recovery is proposed by the constraint variable trajectories analysis of the dynamic programming algorithm in the typical urban bus cycle. The simulation results indicate the brake energy recovery efficiency of the accumulator can reach 60% in the dynamic programming algorithm. And the hydraulic hybrid system can output braking torque as much as possible.Moreover, the accumulator has almost equal efficiency of brake energy recovery between the implementable strategy and the dynamic programming algorithm. Therefore, the implementable strategy is very effective in improving the efficiency of brake energy recovery.The road tests show the fuel economy of the hydraulic hybrid bus improves by 22.6% compared with the conventional bus. 展开更多
关键词 implementable strategy brake energy recovery dynamic programming parallel hydraulic hybrid bus shifting schedule pump/motor displacement.
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Qualitative Research on the Current Implementation Status and Barriers of Nurses’Non-Pharmacological Prescription Authority
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作者 Ying Li Yulin Lu +3 位作者 Yanxia Shang Ling Huang Panpan Cui Pingxi Yang 《Journal of Clinical and Nursing Research》 2026年第1期331-337,共7页
Objective:To systematically review the current implementation status of nurses’non-pharmacological prescription authority and analyze the barriers encountered during its implementation in China,providing countermeasu... Objective:To systematically review the current implementation status of nurses’non-pharmacological prescription authority and analyze the barriers encountered during its implementation in China,providing countermeasures and references for promoting the standardized implementation of nurses’non-pharmacological prescription authority.Methods:A secondary analysis of literature was conducted to systematically search for domestic and international literature related to nurses’non-pharmacological prescription authority.Meta-analysis was performed on eligible literature to evaluate the implementation effects.Simultaneously,semi-structured in-depth interviews were conducted with healthcare workers,patients,and policymakers.Content analysis was used to organize the interview data and extract core issues and barriers.Results:A total of 46 international articles were included in the Meta-analysis,which revealed that the implementation of nurses’non-pharmacological prescription authority significantly improved patients’health management outcomes,enhanced healthcare service efficiency,and increased patient satisfaction.Conclusion:The implementation of nurses’non-pharmacological prescription authority has demonstrated significant positive effects.However,China faces multiple barriers in its advancement,necessitating efforts in optimizing policy systems,constructing collaborative models,strengthening professional skills training,and improving social awareness to guide the scientific and rational implementation of nurses’non-pharmacological prescription authority. 展开更多
关键词 Nurses Non-pharmacological prescription authority Implementation status Barrier factors Qualitative research
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Effect of Sheath Modeling on Unbonded Post-Tensioned Concrete under Blast Loads
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作者 Hyeon-Sik Choi Min Kyu Kim +1 位作者 Jiuk Shin Thomas H.-K.Kang 《Computer Modeling in Engineering & Sciences》 2026年第1期399-415,共17页
Unbonded post-tensioned(PT)concrete systems are widely used in safety-critical structures,yet model-ing practices for prestress implementation and tendon-concrete interaction remain inconsistent.This study investigate... Unbonded post-tensioned(PT)concrete systems are widely used in safety-critical structures,yet model-ing practices for prestress implementation and tendon-concrete interaction remain inconsistent.This study investigates the effects of sheath(duct)implementation and confinement assumptions through nonlinear finite element analysis.Four modeling cases were defined,consisting of an explicit sheath without tendon-concrete confinement(S)and three no-sheath variants with different confinement levels(X,N,A).One-way beams and two-way panels were analyzed,and panel blast responses were validated against experimental results.In both beams and panels,average initial stress levels were similar across models,through local stress concentrations appeared when the sheath was modeled.Under blast loading,these local effects became critical,and the sheath-implemented model reproduced experimental behavior most accurately,whereas non-implemented models deviated.Reduced blast intensity diminished the differences among models,thereby reaffirming that sheath-induced localization and damage propagation are critical factors.These findings highlight the importance of explicit sheath implementation for realistic numerical assessment of unbonded PT structures under extreme loads. 展开更多
关键词 Unbonded post-tensioned concrete sheath implementation blast loading finite element analysis
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Long-term Mechanism and Implementation Path of Increasing Income of Rural Low-income Population in Zhejiang Province from the Perspective of Common Prosperity
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作者 Peiyi YE 《Asian Agricultural Research》 2026年第2期23-26,共4页
Taking the rural low-income population of Zhejiang Province as its subject, this paper examines how to build a sustainable income-growth mechanism and identify feasible implementation paths within the context of the c... Taking the rural low-income population of Zhejiang Province as its subject, this paper examines how to build a sustainable income-growth mechanism and identify feasible implementation paths within the context of the common prosperity strategy. The research identifies key obstacles to income expansion, including an undiversified industrial structure, insufficient human capital, and a lack of robust social protection. These call for systemic solutions featuring institutional innovation, resource consolidation, and capability enhancement. Building on Zhejiang's experience as a common prosperity demonstration zone, the article constructs an integrated framework centered on four pillars: industrial empowerment, education upgrading, social security reinforcement, and digital coordination. It further offers concrete policy proposals involving the cultivation of localized industries, vocational skill training, enhanced safety nets, and the adoption of digital tools. The study thus offers both theoretical insights and practical paradigms for tackling the challenge of raising incomes in low-income rural areas. 展开更多
关键词 Common prosperity Rural low-income population Long-term mechanism of increasing income Implementation path Zhejiang Province
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Blood biomarkers for Alzheimer’s disease:Key challenges of clinical implementation
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作者 Rafaela Luiza C.Franco Tai R.Hunter Fernanda G.De Felice 《Neural Regeneration Research》 2026年第6期2361-2362,共2页
Alzheimer’s disease(AD)is a complex,progressive neurodegenerative disorder and the leading cause of dementia worldwide.It is characterized by the accumulation of extracellular amyloid-beta(Aβ)plaques and intracellul... Alzheimer’s disease(AD)is a complex,progressive neurodegenerative disorder and the leading cause of dementia worldwide.It is characterized by the accumulation of extracellular amyloid-beta(Aβ)plaques and intracellular tau neurofibrillary tangles,leading to synaptic dysfunction,neuronal loss,and cognitive decline.These pathological changes can begin decades before clinical symptoms emerge,highlighting the critical need for early,accessible,and accurate diagnostic tools. 展开更多
关键词 blood biomarkers amyloid beta plaques tau neurofibrillary tanglesleading alzheimer s disease ad clinical implementation Alzheimers disease neurodegenerative disorder diagnostic tools
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Hainan FTP:A New Step to Align with International Rules in Opening-Up
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作者 YU YUNQUAN 《China Today》 2026年第3期32-33,共2页
The Hainan Free Trade Port’s implementation of special customs operations marks a significant stride in China’s institutional opening-up,spurring global trade and investment flows.THE Hainan Free Trade Port(FTP)repr... The Hainan Free Trade Port’s implementation of special customs operations marks a significant stride in China’s institutional opening-up,spurring global trade and investment flows.THE Hainan Free Trade Port(FTP)represents a significant step forward in China’s pursuit of high-standard opening-up and greater engagement in economic globalization. 展开更多
关键词 implementation special customs operations Special Customs Operations free trade port s Global Trade Hainan Free Trade Port free trade port ftp represents Institutional Opening Up Investment Flows
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A Methodology for Implementable Comprehensive Urban Design in Large Scale Projects:A Case Study on Daqing Comprehensive Urban Design
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作者 Ze LIU Wensheng ZHOU +1 位作者 Wensong SU Min LI 《China City Planning Review》 2013年第4期42-49,共8页
Based on relevant urban planning and design standards and a study on successful cases of comprehensive urban design in China, this paper explores a methodology of comprehensive urban design in large scale projects by ... Based on relevant urban planning and design standards and a study on successful cases of comprehensive urban design in China, this paper explores a methodology of comprehensive urban design in large scale projects by applying classical urban design theories and advanced digital technologies. This enables a combination of artful design and scientifi c analysis through the establishment of an urban design indicator system, the application of digital technologies and a multi-leveled control over design contents. The chosen case of the Daqing Comprehensive Urban Design shows that the proposed measures can effectively promote the supervision of comprehensive urban design on both urban morphology and landscape, rapidly convert the urban design outcomes into management rules, and ultimately facilitate the application of the urban design outcomes. 展开更多
关键词 comprehensive urban design large scale IMPLEMENTATION digital technology Daqing City
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Proposal for the Largest Waste Management in Landfills in Indonesia for Environmental Sustainability and Public Health 被引量:1
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作者 Diana Mayasari Bambang Heru Purwanto R.Taqwaty Firdausijah 《Journal of Environmental & Earth Sciences》 2025年第3期34-46,共13页
This study examines the impact of waste management policies on public health in Bantar Gebang landfill which faces challenges such as inadequate infrastructure,low community participation,and ineffective policy implem... This study examines the impact of waste management policies on public health in Bantar Gebang landfill which faces challenges such as inadequate infrastructure,low community participation,and ineffective policy implementation.More than half of the waste generated is not transported to landfills,resulting in significant health and environmental risks,including respiratory infections,waterborne diseases,and vector-borne illnesses.The research adopts a qualitative phenomenological approach to understand the experiences of stakeholders,waste managers,and local communities.It also integrates the Waste Management Hierarchy,Community Participation Theory,and Policy Implementation Model to identify key gaps and propose potential solutions.The study reviews legal frameworks,including Indonesia’s Presidential Regulation No.97 of 2017,and specific regulations relevant to the site,evaluating their effectiveness in addressing waste and health issues.The findings highlight the need for stronger public education campaigns,increased investment in infrastructure,and the implementation of advanced technologies such as Waste-to-Energy plants.The study stresses that comprehensive policies on waste reduction,improved segregation,and better recycling practices are critical for achieving sustainable waste management.Additionally,greater inter-agency collaboration and active community engagement are essential for ensuring successful implementation.Drawing on experiences from Tokyo,Stockholm,and Berlin,the study suggests strategies to reduce landfill dependence and improve public health. 展开更多
关键词 Waste Management Environmental Health Community Participation Public Policy Implementation Sustainable Urban Planning
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What are the key determinants to fostering equity within coronavirus disease 2019(COVID-19)vaccination deployment initiatives in Nigeria?A scoping review 被引量:1
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作者 Asua Okolie Shahreen Rahman +1 位作者 Anita Kothari Obidimma Ezezika 《Global Health Journal》 2025年第1期12-19,共8页
Objective:This review aimed to identify the barriers and facilitators to equitable coronavirus disease 2019(COVID-19)vaccine distribution in Nigeria using the consolidated framework for implementation research(CFIR).M... Objective:This review aimed to identify the barriers and facilitators to equitable coronavirus disease 2019(COVID-19)vaccine distribution in Nigeria using the consolidated framework for implementation research(CFIR).Methods:A comprehensive search strategy was applied across five databases—Web of Science,MEDLINE,EMBASE,CAB Direct,and CINAHL.The search,conducted as part of a scoping review,yielded 2,751 citations.Seven studies met the inclusion criteria after screening.Data were extracted and analyzed using CFIR constructs to identify key barriers and facilitators to equitable vaccine distribution.Results:Six barriers were identified:limited physical and socioeconomic access,bribery,nepotism,and insufficient availability of translated information.Facilitators included community involvement as local monitoring agents,unannounced staff inspections,healthcare worker training tailored to community needs,and localized outreach strategies such as jingles and call-in programs.CFIR constructs,including Local Conditions,Tailoring Strategies,Available Resources,and Physical Infrastructure,provided a framework for analyzing the findings.Conclusion:This review highlights significant barriers and promising facilitators to equitable vaccine distribution in Nigeria.Targeted interventions,such as community engagement,anti-corruption measures,and culturally tailored strategies,are critical to addressing these challenges and improving access.These findings underscore the need for localized,equity-focused approaches to enhance vaccine distribution systems in Nigeria and other low-resource settings. 展开更多
关键词 Coronavirus disease 2019(COVID-19) VACCINATION Vaccine equity NIGERIA Healthcare disparities Implementation science Health system strengthening Equity in vaccine distribution Socioeconomic barriers Geographic disparities Public health policy Community engagement Tailored outreach Consolidated framework for implementation research(CFIR)framework Vaccine hesitancy Health disparities in LMICs Global health equity
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TtLR:A Lightweight and Transferable Side Channel Distinguisher Against Kyber
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作者 GUO Shao-Qing CHEN Peng CHENG Chi 《密码学报(中英文)》 北大核心 2025年第6期1430-1444,共15页
Plaintext-checking(PC)oracle-based key recovery attack stands out as one of the most critical threat targeting Kyber due to its high effciency and ease of implementation.In practical scenarios,however,the output of th... Plaintext-checking(PC)oracle-based key recovery attack stands out as one of the most critical threat targeting Kyber due to its high effciency and ease of implementation.In practical scenarios,however,the output of the oracle may suffer accuracy degradation when instantiating it through a side-channel trace distinguisher due to the environmental noise and the cross-device issue.While various deep learning-based approaches have been proposed to address the inaccuracy problem caused by the cross-device issue,they often suffer from complexity and limited interpretability.This work investigates realistic numerous side-channel attack(SCA)scenarios and focuses on the cross-device issue when implementing a reliable PC oracle in SCAs against Kyber.TtLR is proposed,it combines the ttest with a logistic regression model to implement a lightweight but effcient side-channel distinguisher against Kyber KEM.The proposed approach is validated through experiments on STM32F407G boards equipped with ARM Cortex-M4 microcontrollers,using the Kyber512 implementations from the pqm4 library.The results demonstrate that the proposed method achieves high PC oracle accuracy across different boards with low computational and memory overhead.This makes the proposed distinguisher practical for deployment on resource-constrained platforms such as the Raspberry Pi running a Linux system. 展开更多
关键词 CRYSTALS-Kyber side-channel analysis transferablity lightweight implementation
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About KIT
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《Asian Agricultural Research》 2025年第11期47-47,共1页
The Royal Tropical Institute(KIT)in Amsterdam is an independent centre of knowledge and expertise in the areas of international and intercultural cooperation,operating at the interface between theory and practice and ... The Royal Tropical Institute(KIT)in Amsterdam is an independent centre of knowledge and expertise in the areas of international and intercultural cooperation,operating at the interface between theory and practice and between policy and implementation.The Institute contributes to sustainable development,poverty alleviation and cultural preservation and exchange. 展开更多
关键词 cultural preservation implementation sustainable development theory practice intercultural cooperation international cooperation sustainable developmentpoverty alleviation policy implementation
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Mechanism and Implementation Panths of Low-Altitude Economy in Promoting Transformation and Upgrading of Tourism Industry in Zhejiang Province
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作者 Zhenzi GUO 《Asian Agricultural Research》 2025年第8期13-15,26,共4页
Taking Zhejiang Province as an example,this paper explores the mechanisms and implementation pathways through which the low-altitude economy drives the transformation and upgrading of the tourism industry.It finds tha... Taking Zhejiang Province as an example,this paper explores the mechanisms and implementation pathways through which the low-altitude economy drives the transformation and upgrading of the tourism industry.It finds that the low-altitude economy can effectively promote the development of high-end and diversified tourism in Zhejiang by innovating tourism formats,optimizing resource allocation,and enhancing tourist experiences.Besides,it analyzes the current development status of the low-altitude economy in Zhejiang and its potential for integration with tourism,revealing specific enabling pathways for tourism transformation,including low-altitude sightseeing,aviation tourism,and low-altitude sports.Finally,it proposes policy recommendations such as strengthening policy support,enhancing infrastructure development,and cultivating market entities.The findings aim to provide theoretical references and practical guidance for the high-quality development of tourism in Zhejiang Province. 展开更多
关键词 LOW-ALTITUDE ECONOMY Transformation and upgrading of the tourism industry Action MECHANISM IMPLEMENTATION path ZHEJIANG Province
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Smart Healthcare:The Role of Digital Health in Modern Medicine
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作者 Nidha Shapoo Naveed Shapoo +1 位作者 Abdul Rehman Noella Boma 《Health Care Science》 2025年第3期179-187,共9页
Digital health is transforming healthcare by integrating advanced technologies to make healthcare more accessible,efficient,and personalized.From electronic health records,telemedicine,wearable devices,and artificial ... Digital health is transforming healthcare by integrating advanced technologies to make healthcare more accessible,efficient,and personalized.From electronic health records,telemedicine,wearable devices,and artificial intelligence to the recent smart hospitals,digital health is improving patient care and outcomes while reducing healthcare costs.However,the integration of digital health faces several challenges,including data privacy,cybersecurity risks,and inequitable access to technology.This article provides an overview of the current state of digital health,key challenges in implementation,and potential solutions to maximize the benefits of digital health and ensure efficient,equitable,and patient‐centered healthcare in the future. 展开更多
关键词 challenges digital health healthcare implementation innovations SOLUTIONS
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Additional considerations on vonoprazan triple therapy for Helicobacter pylori eradication:Implementation challenges and clinical perspectives
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作者 Chu-Ying Sun Ming-Xian Chen 《World Journal of Gastroenterology》 2025年第46期208-210,共3页
The vonoprazan(VPZ)triple therapy regimen for Helicobacter pylori(H.pylori)eradication developed by Han et al employs a scientifically rigorous clinical trial design.This multicenter randomized controlled trial establ... The vonoprazan(VPZ)triple therapy regimen for Helicobacter pylori(H.pylori)eradication developed by Han et al employs a scientifically rigorous clinical trial design.This multicenter randomized controlled trial establishes a standardized treatment framework aimed at improving H.pylori eradication rates,focusing on simplifying treatment regimens,shortening therapy duration,and optimizing therapeutic outcomes.The core of clinical translation lies in improving drug accessibility,establishing multidimensional safety evaluation systems,and optimizing cost-effectiveness.Conducting regional adaptability studies and comprehensive safety assessments is crucial for enhancing VPZ regimen effectiveness in China’s diverse healthcare environments.This study provides important evidence-based support for optimizing H.pylori treatment strategies in China,though further validation of universal applicability for nationwide implementation remains necessary. 展开更多
关键词 Helicobacter pylori Vonoprazan Multicenter trial Regional differences Clinical implementation
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Study on the Historical Changes,Characteristics,and Implementation Challenges of Uzbekistan’s Language Policy
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作者 DING Xueling HU Jianqiang 《Cultural and Religious Studies》 2025年第5期233-241,共9页
Language policies are of great significance to a nation’s stability,unity,and development.Uzbekistan’s language policies have reflected the political,economic,and cultural dynamics of different periods throughout hi... Language policies are of great significance to a nation’s stability,unity,and development.Uzbekistan’s language policies have reflected the political,economic,and cultural dynamics of different periods throughout historical changes,influencing social structures and ethnic relations.This paper summarizes the characteristics of Uzbekistan’s language policies in different eras:During the Tsarist Russian period,the Russification of language policies hindered the development of local languages;in the Soviet era,policies adopted a dual approach,promoting both Russian and prioritizing ethnic languages;after independence,Uzbekistan established Uzbek as the state language and emphasized foreign language education.The current language policy in Uzbekistan presents a complex landscape:While emphasizing the dominant role of the national language helps preserve its heritage,it may easily spark ethnic and political tensions;promoting pluralism and inclusivity brings benefits but faces challenges in balancing language statuses,resource allocation,management,and communication;modernization efforts encounter difficulties in standardizing dialects and foreign loanwords;and in international exchanges,there is a need to balance relations with global lingua francas.In conclusion,Uzbekistan’s language policies have undergone unique transformations and face numerous challenges.In-depth research is crucial for improving the country’s policies and enhancing China-Uzbekistan cooperation.Proactive measures are needed to address these challenges,ensuring the sustainability of language policies and fostering greater national prosperity. 展开更多
关键词 Uzbekistan language policy historical changes implementation challenges medical diplomacy
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From static thresholds to dynamic trends:Reassessing serum calcium in anastomotic leakage prediction
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作者 Jiang-Peng Zhu Yu-Tong Chen Guang-Yao Li 《World Journal of Gastrointestinal Surgery》 2025年第10期455-457,共3页
Kang et al published a study recently in the World Journal of Gastroenterology introducing an interpretable machine learning model to predict anastomotic leakage after rectal cancer surgery,highlighting postoperative ... Kang et al published a study recently in the World Journal of Gastroenterology introducing an interpretable machine learning model to predict anastomotic leakage after rectal cancer surgery,highlighting postoperative serum calcium as a key predictive feature.While this represents a significant advancement,we argue that reliance on a static calcium threshold may limit clinical applicability.We advocate for a dynamic,trajectory-based assessment of serum calcium levels across perioperative time points,using modeling approaches such as time-series regression or mixed-effects models.Furthermore,the model’s robustness could be improved by incorporating systemic inflammation and nutritional indices such as C-reactive protein,procalcitonin,the neutrophil-to-lymphocyte ratio,and the systemic immune-inflammation index,supported by recent prospective studies.Finally,generalizability remains a concern,warranting broader validation and clearer clinical deployment strategies.By addressing these aspects,the model’s clinical translation and decision-making impact could be substantially enhanced. 展开更多
关键词 Anastomotic leakage Serum calcium Machine learning Dynamic monitoring Systemic inflammation Clinical implementation
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Optimizing AES S-Box Implementation:A SAT-Based Approach with Tower Field Representations
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作者 Jingya Feng Ying Zhao +1 位作者 Tao Ye Wei Feng 《Computers, Materials & Continua》 2025年第4期1515-1531,共17页
The efficient implementation of the Advanced Encryption Standard(AES)is crucial for network data security.This paper presents novel hardware implementations of the AES S-box,a core component,using tower field represen... The efficient implementation of the Advanced Encryption Standard(AES)is crucial for network data security.This paper presents novel hardware implementations of the AES S-box,a core component,using tower field representations and Boolean Satisfiability(SAT)solvers.Our research makes several significant contri-butions to the field.Firstly,we have optimized the GF(24)inversion,achieving a remarkable 31.35%area reduction(15.33 GE)compared to the best known implementations.Secondly,we have enhanced multiplication implementa-tions for transformation matrices using a SAT-method based on local solutions.This approach has yielded notable improvements,such as a 22.22%reduction in area(42.00 GE)for the top transformation matrix in GF((24)2)-type S-box implementation.Furthermore,we have proposed new implementations of GF(((22)2)2)-type and GF((24)2)-type S-boxes,with the GF(((22)2)2)-type demonstrating superior performance.This implementation offers two variants:a small area variant that sets new area records,and a fast variant that establishes new benchmarks in Area-Execution-Time(AET)and energy consumption.Our approach significantly improves upon existing S-box implementations,offering advancements in area,speed,and energy consumption.These optimizations contribute to more efficient and secure AES implementations,potentially enhancing various cryptographic applications in the field of network security. 展开更多
关键词 AES S-box SAT optimization tower field hardware implementation area efficiency energy consumption
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Research on the Reform of Approaches to Early Childhood Character Education
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作者 Li Longqing Liu Jialing 《Contemporary Social Sciences》 2025年第6期102-115,共14页
Early childhood character education is a critical element in shaping an individual’s moral foundation and fostering a sense of social responsibility.It plays a fundamental role in overall personal development.Althoug... Early childhood character education is a critical element in shaping an individual’s moral foundation and fostering a sense of social responsibility.It plays a fundamental role in overall personal development.Although China’s early childhood character education has made progress with the support of policies and practical exploration,it still faces challenges such as the homogenization of educational models,a formalization of home-kindergarten cooperation,a single-dimensional evaluation system,and a need for further improvement in teachers’professional competence in character education.This paper draws on core theories of character education(e.g.,social learning theory and cognitive moral development theory)and incorporates representative case studies to conduct an in-depth analysis of the current landscape and associated challenges.It proposes innovative approaches,which include establishing a“threefold”system of implementation,enhancing the mechanisms for home-kindergarten co-education,optimizing and ensuring a multidimensional and dynamic evaluation system,equitably allocating teaching resources,and expanding the social support networks.The aim is to offer theoretical reference and practical solutions to promote the scientific and systematic development of early childhood character education. 展开更多
关键词 character education early childhood development home-kindergarten co-education evaluation mechanism implementation pathway
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Numerical analysis of hydro-mechanical coupling behaviour during shearing of rock fractures based on an improved friction factor model
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作者 Xu Zhu Guangyao Si +2 位作者 Chengguo Zhang Joon-Shik Moon Joung Oh 《Journal of Rock Mechanics and Geotechnical Engineering》 2025年第10期6079-6094,共16页
Both the complex geometrical morphology of rough-walled rock fractures and the nonlinearity of fluid flow contribute to resistance in fluid flow through rock fractures.The interactions of the shear-flow process furthe... Both the complex geometrical morphology of rough-walled rock fractures and the nonlinearity of fluid flow contribute to resistance in fluid flow through rock fractures.The interactions of the shear-flow process further complicate the characterisation of flow behaviours in rock fractures.In this study,an improved friction factor model involving both the effects of viscous and inertial forces is presented based on the Forchheimer equation.The model incorporates two key variables,i.e.Reynolds number and relative roughness,which reflect the effects of flow regimes and fracture roughness,respectively.The changes in geometrical parameters induced by shearing are considered,with the peak asperity height predicted through a correlation with post-peak roughness degradation.The hydraulic aperture during shearing is estimated using a suggested equation that accounts for the mobilised contact area ratio and variable aperture distribution.The parametric sensitivity analysis reveals that shear-induced changes in fracture geometry enhance the flow nonlinearity in rock fractures.The model performs well in predicting the friction factor based on two validation criteria.Then,the proposed friction factor model is incorporated into the three-dimensional distinct element code(3DEC)in the form of the Darcy-Weisbach equation.Coupled with the numerically implemented mechanical model and hydraulic aperture prediction model,numerical simulations of coupled shear-flow processes in single rock fractures are conducted.The simulation outcomes are validated through comparison with the experimental results,showing acceptable agreement and demonstrating that the numerical model is capable of accurately evaluating the hydro-mechanical coupling behaviour during the shearing of rock fractures. 展开更多
关键词 Rock fracture Friction factor Numerical implementation Fracture geometries Flow nonlinearity Shear-flow coupled
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Opportunities and Challenges of Educational Evaluation in the Metaverse
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作者 Lili Lu Yan Zhao +1 位作者 Peiran Ma Xin Xu 《Journal of Contemporary Educational Research》 2025年第7期226-231,共6页
As an emerging technological form,the metaverse provides innovative transformations for all levels of education-including scenarios,resources,and models-through its highly immersive and powerful social interaction cha... As an emerging technological form,the metaverse provides innovative transformations for all levels of education-including scenarios,resources,and models-through its highly immersive and powerful social interaction characteristics.Educational evaluation is core to assessing teaching effects and improving teaching strategies.With the technical support of the metaverse,challenges in traditional educational evaluation can be addressed,and comprehensive multi-dimensional portraits of individuals and collectives can be depicted,effectively enhancing teaching outcomes.Therefore,it has important value and untapped potential.This paper first analyzes the characteristics of educational evaluation in the metaverse context,discusses possible opportunities and challenges,then explores comprehensive practical paths from macro,meso,and micro levels,providing suggestions for the reform of educational evaluation in the metaverse environment. 展开更多
关键词 Metaverse Educational evaluation Implementation path
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