Interrater Reliability Estimation via Maximum Likelihood for Gwet’s Chance Agreement Model

Interrater reliability (IRR) statistics, like Cohen’s kappa, measure agreement between raters beyond what is expected by chance when classifying items into categories. While Cohen’s kappa has been widely used, it has several limitations, prompting development of Gwet’s agreement statistic, an alternative “kappa”statistic which models chance agreement via an “occasional guessing” model. However, we show that Gwet’s formula for estimating the proportion of agreement due to chance is itself biased for intermediate levels of agreement, despite overcoming limitations of Cohen’s kappa at high and low agreement levels. We derive a maximum likelihood estimator for the occasional guessing model that yields an unbiased estimator of the IRR, which we call the maximum likelihood kappa (κML). The key result is that the chance agreement probability under the occasional guessing model is simply equal to the observed rate of disagreement between raters. The κMLstatistic provides a theoretically principled approach to quantifying IRR that addresses limitations of previous κcoefficients. Given the widespread use of IRR measures, having an unbiased estimator is important for reliable inference across domains where rater judgments are analyzed.

Chaotic Map-Based Authentication and Key Agreement Protocol with Low-Latency for Metasystem

With the rapid advancement in exploring perceptual interactions and digital twins,metaverse technology has emerged to transcend the constraints of space-time and reality,facilitating remote AI-based collaboration.In this dynamic metasystem environment,frequent information exchanges necessitate robust security measures,with Authentication and Key Agreement(AKA)serving as the primary line of defense to ensure communication security.However,traditional AKA protocols fall short in meeting the low-latency requirements essential for synchronous interactions within the metaverse.To address this challenge and enable nearly latency-free interactions,a novel low-latency AKA protocol based on chaotic maps is proposed.This protocol not only ensures mutual authentication of entities within the metasystem but also generates secure session keys.The security of these session keys is rigorously validated through formal proofs,formal verification,and informal proofs.When confronted with the Dolev-Yao(DY)threat model,the session keys are formally demonstrated to be secure under the Real-or-Random(ROR)model.The proposed protocol is further validated through simulations conducted using VMware workstation compiled in HLPSL language and C language.The simulation results affirm the protocol’s effectiveness in resisting well-known attacks while achieving the desired low latency for optimal metaverse interactions.

Cautionary Remarks When Testing Agreement between Two Raters for Continuous Scale Measurements: A Tutorial in Clinical Epidemiology with Implementation Using R

Background: When continuous scale measurements are available, agreements between two measuring devices are assessed both graphically and analytically. In clinical investigations, Bland and Altman proposed plotting subject-wise differences between raters against subject-wise averages. In order to scientifically assess agreement, Bartko recommended combining the graphical approach with the statistical analytic procedure suggested by Bradley and Blackwood. The advantage of using this approach is that it enables significance testing and sample size estimation. We noted that the direct use of the results of the regression is misleading and we provide a correction in this regard. Methods: Graphical and linear models are used to assess agreements for continuous scale measurements. We demonstrate that software linear regression results should not be readily used and we provided correct analytic procedures. The degrees of freedom of the F-statistics are incorrectly reported, and we propose methods to overcome this problem by introducing the correct analytic form of the F statistic. Methods for sample size estimation using R-functions are also given. Results: We believe that the tutorial and the R-codes are useful tools for testing and estimating agreement between two rating protocols for continuous scale measurements. The interested reader may use the codes and apply them to their available data when the issue of agreement between two raters is the subject of interest.

“一带一路”贸易便利化的十年进展、问题分析与推进路径

共建“一带一路”走过了蓬勃十年,它不仅是中国新时代扩大对外开放的总抓手,而且为国际社会提供了重要合作平台。贸易畅通是共建“一带一路”的核心任务之一,贸易便利化对推动“一带一路”贸易畅通至关重要。在共建“一带一路”十周年之际,本文从商签自贸协定、加强海关合作、交通互联互通、发展贸易新业态四个方面,系统总结十年来“一带一路”贸易便利化的历程与进展,剖析当前存在的问题,探讨进一步提升贸易便利化水平的路径。

Improved quantum key agreement protocol with authentication

In order to make the quantum key agreement process immune to participant attacks, it is necessary to introduce the authentication in the communication process. A quantum key agreement protocol with identity authentication that exploits the measurement correlation of six-particle entangled states is proposed. In contrast to some recently proposed quantum key agreement protocols with authentication, this protocol requires neither a semi-trusted third party nor additional private keys in the authentication process. The entire process of authentication and key agreement can be achieved using only n six-particle entangled states, which saves communication costs and reduces the complexity of the authentication process.Finally, security analysis shows that this scheme is resistant to some important attacks.

Efficient Certificateless Authenticated Key Agreement for Blockchain-Enabled Internet of Medical Things

Internet of Medical Things(IoMT)plays an essential role in collecting and managing personal medical data.In recent years,blockchain technology has put power in traditional IoMT systems for data sharing between different medical institutions and improved the utilization of medical data.However,some problems in the information transfer process between wireless medical devices and mobile medical apps,such as information leakage and privacy disclosure.This paper first designs a cross-device key agreement model for blockchain-enabled IoMT.This model can establish a key agreement mechanism for secure medical data sharing.Meanwhile,a certificateless authenticated key agreement(KA)protocol has been proposed to strengthen the information transfer security in the cross-device key agreement model.The proposed KA protocol only requires one exchange of messages between the two parties,which can improve the protocol execution efficiency.Then,any unauthorized tampering of the transmitted signed message sent by the sender can be detected by the receiver,so this can guarantee the success of the establishment of a session key between the strange entities.The blockchain ledger can ensure that the medical data cannot be tampered with,and the certificateless mechanism can weaken the key escrow problem.Moreover,the security proof and performance analysis are given,which show that the proposed model and KA protocol are more secure and efficient than other schemes in similar literature.

以高水平开放助推新质生产力发展

新时代以来,中国实行更加积极主动的开放战略,高水平对外开放不断跃上新台阶,成为推动中国经济高质量发展的重要动力。高水平开放同样是助推新质生产力发展的重要动力:制度型开放,有助于吸引全球优质资源要素为新质生产力发展赋能;对“一带一路”直接投资的逆向技术溢出,有助于全要素生产率提升;环境保护等国际高标准经贸规则新议题谈判,将倒逼绿色生产力发展。未来,以高水平开放助推新质生产力发展的重点路径包括:稳步扩大制度型开放,为吸引全球优质资源要素营造良好投资环境;推进共建“一带一路”高质量发展走向新阶段,赋能全要素生产率提升;推进自由贸易协定向更高标准迈进,促进经济发展全面绿色转型。

A Provably Secure and PUF-Based Authentication Key Agreement Scheme for Cloud-Edge IoT

With the exponential growth of intelligent Internet of Things(IoT)applications,Cloud-Edge(CE)paradigm is emerging as a solution that facilitates resource-efficient and timely services.However,it remains an underlying issue that frequent end-edgecloud communication is over a public or adversarycontrolled channel.Additionally,with the presence of resource-constrained devices,it’s imperative to conduct the secure communication mechanism,while still guaranteeing efficiency.Physical unclonable functions(PUF)emerge as promising lightweight security primitives.Thus,we first construct a PUF-based security mechanism for vulnerable IoT devices.Further,a provably secure and PUF-based authentication key agreement scheme is proposed for establishing the secure channel in end-edge-cloud empowered IoT,without requiring pre-loaded master keys.The security of our scheme is rigorously proven through formal security analysis under the random oracle model,and security verification using AVISPA tool.The comprehensive security features are also elaborated.Moreover,the numerical results demonstrate that the proposed scheme outperforms existing related schemes in terms of computational and communication efficiency.

“双自联动”加快构建新发展格局的理论思考与政策建议

本文以党的二十大和二十届三中全会精神为指导,基于稳步扩大制度型开放、构建“双循环”新发展格局和推进中国式现代化的战略要求,以中国对外签订自由贸易协定(FTA)和对内设立自贸试验区(FTZ)形成的两大网络体系为主轴,从理论上阐释了“双自联动”与构建“双循环”新发展格局之间的逻辑机理,揭示了“双自联动”的重点领域,以及通过FTA与FTZ三层次、多层级“双自联动”稳步扩大制度型开放与促进构建新发展格局的机制路径,为我国构建更高水平的开放型经济新体制提供自主创新的理论思路与实践对策建议。

越南自贸协定中的农业开放策略及对中国的启示

近年来,越南作为亚太地区重要的新兴经济体,构建了面向主要贸易伙伴的自由贸易区网络,积极推动农业对外开放,促进了农业贸易与投资的增长,并通过对标国际高标准经贸规则倒逼国内农业改革,巩固了农业产业优势,将自身农业发展更深地嵌入全球农业供应链。与越南相比,中国目前签署的自由贸易协定涵盖的农产品贸易额较低,农业货物贸易自由化水平及服务贸易和投资开放水平有待提升。在新发展阶段,基于建设农业强国和贸易强国的现实要求,中国应继续积极推进高标准、高水平自由贸易区建设,分类设计自由贸易协定中的农业货物贸易开放方案,加大涉农服务投资开放的压力测试,并关注农业开放中的产业损害问题。

全球农业贸易规则演变与中国粮食安全战略

当前,全球农业贸易规则正从多边治理向多边—双边双重治理转换、由低标准治理向高标准治理提升、由边境规则向边境内规则拓展、由规则协调刚性向包容并蓄转变,这是全球地缘政治经济格局变动下国家竞争的结果。文章重点考察了农业贸易规则演变对中国粮食安全的影响。研究发现,农业市场准入规则加剧了粮食贸易逆差,投资规则可能诱发跨国公司在华垄断,高标准SPS规则降低了农产品竞争力,而知识产权保护、环境保护、电子商务、竞争中性等边境内规则对中国粮食安全产生了多重影响。在此基础上,文章从构建全球自由贸易区网络、主动对接和积极构建农业贸易规则、构建竞争有序的粮食市场体系、加强外商投资的引导与监管、加快培育国内粮食龙头企业、完善粮食安全应急保障机制等六个方面提出强化粮食安全的战略举措。

药品数据专有权国际立法溯源与中国制度安排

药品上市审批对于药品安全有效性数据的专门审查要求,造就了涉及药品数据的独特知识产权保护机制。基于药品数据获取的高昂投入及其对于药品仿制与后续创新的重要价值,美欧发达国家在世界范围内率先建立了药品数据保护机制,其逐渐成为一项国际性的法律规则。无论是美欧发达国家的立法,还是相关国际法律规则,对于药品数据的知识产权保护都呈现从商业秘密模式向专有权机制转变的立法格局。产业利益驱动无疑是其中的一个重要诱因,但归根结底是源自药品数据专有权有效兼顾原研发药企经济利益与社会公众健康权益的制度优势。鉴于此,在药品数据专有权保护的国际趋势下,我国应从本土药品产业激励创新与规范仿制的基本诉求出发,以必要的内部限制与外部监管明确药品数据专有权的法律边界,并通过药品数据动态化公示平台的设置与药品数据付费使用模式的创设,建构起与药品专利制度有机衔接的数据专有权保护机制。

跨境数据流动规制的模式差异、协调路径与中国方案

截至目前,全球并未形成统一的数据流动规则体系,数据跨境流动规则主要分为美国模式、欧盟模式和中国模式。由于主要数字经济体在数据跨境流动与数据安全保护之间的关注焦点不同,以全球主义或国际软法为方法推进高标准的全球统一数据流动规则体系构建的方案,在短期内难以实现。作为数字经济大国,我国应转变对商业数据跨境流动相对保守的态度。我国可以全面与进步跨太平洋伙伴关系协定(CPTPP)“电子商务”章节为主要内容,探索通过与韩国、日本及欧洲、东南亚国家等缔结专门的数字贸易协定,推动跨境流动规则体系的建设。我国还应加快对区域全面经济伙伴关系协定(RCEP)等经贸协定“电子商务”规则的国内转化立法,特别是积极引入数据跨境流动的风险评估理念与制度。

5G车联网中安全高效的组播服务认证与密钥协商方案

5G车联网(5G-V2X)中,内容提供者通过以点对多的传输方式向属于特定区域的一组车辆提供服务消息。针对于车辆获取组播服务遭受的安全威胁与隐私泄露问题,该文提出一种认证和密钥协商方案用于内容提供者与车辆之间的组播服务消息传输。首先,采用无证书聚合签名技术批量验证群组内所有车辆,提高了认证请求的效率。其次,基于多项式密钥管理技术实现安全的密钥协商,使得非法用户或核心网络无法获取共享会话密钥。最后,实现了群组内车辆的动态密钥更新机制,当车辆加入或离开群组时,内容提供者只需要发送1条密钥更新消息即可更新会话密钥。基于形式化验证工具和进一步安全性分析表明,所提方案可以保证匿名性、不可链接性、前向和后向安全性以及抗共谋攻击等安全需求。与现有方案相比,计算效率提高了约34.2%。

部际信用治理合作备忘录:性质、效力与优化

合作备忘录是部际信用合作治理的重要方式。不同于行政规范性文件,合作备忘录既是公法协定中的部际协定,也是一种契约治理形态。合作备忘录遵循契约相对性一般原理,具有相对效力,但这种效力相对性也是相对的。由于科层制特有的权力结构与行政服从义务、不完善的信用立法、对个人利益的保护等,合作备忘录的效力溢出至地方公权力主体和相对人。合作备忘录具有补充信用立法、强化行政协助、促进参与式治理等优势,也存在冲击法律体系、违反法律保留原则、规避监督、缺乏合作保障等不足,因而需从合法性、规范性、民主性等方面加以优化。

国家力量的双重进入与村规民约的重塑——基于215份优秀村规民约的文本分析

国家权力主要通过国家的“村规民约化”和村规民约的“国家化”两种方式进入到乡土社会中。国家力量与地方非正式规范的遭遇中,嵌入地方知识的同时将其纳入到国家的规则体系之下规范化地运行。当代村规民约在承担更多的国家政策的转译与国家规范化要求的同时也面临着治理资源不足的困境,因此当代村规民约需要以治理有效为目标引入多元复合的治理手段,以交错配置的方式来完成其治理内容。村规民约的性质也从传统时期的非正式制度转向“自治、法治、德治”相融合的制度载体。

网络通信中嵌入式TCP/IP协议单片机技术的应用

嵌入式系统已经是当前网络通信的主要技术。单片机在嵌入式系统开发与实现中的多个环节发生作用。为此,文章重点探讨在网络通信系统嵌入式协议中单片机的具体应用。首先对嵌入式协议技术的总体架构与技术细节进行了汇总;其次对单片机技术及其作用进行了探讨;最后从多个方面分别分析了单片机在具体电路中的应用。以期为后续的产品开发与技术应用奠定基础。

区域贸易协定中竞争政策规则对出口国内增加值的影响研究

以64个国家1995—2017年141个区域贸易协定为样本,在测度竞争政策规则深度的基础上,实证考察其对出口国内增加值的影响。研究结果表明:竞争政策规则的强化有助于提升缔约方出口国内增加值。该结果经过稳健性检验后依然成立。机制分析结果表明,缔约方制度质量加强了竞争政策规则对出口国内增加值的促进作用,但区域贸易协定灵活度会阻碍该促进作用。区分条款发现,横向原则与国有企业条款可以促进出口国内增加值;区分国别发现,竞争政策规则对不同经济发展水平国家出口国内增加值存在异质性影响。进一步分析发现,竞争政策规则的强化对第三方国家存在溢出效应。因此,中国应有意识地强化竞争政策的基础性地位,合理设计竞争政策条款并逐步提升执行度,打造更为开放透明、公平竞争的市场环境。

环境法典编纂纳入“双碳”目标的可行路径研究

习近平总书记在党的二十大报告中明确指出要积极稳妥推进碳达峰碳中和,自我国提出“双碳”目标以来不仅在全球气候变化治理发挥了积极作用,还进一步推进了国内能源、经济等领域的低碳发展转型。通过对“双碳”目标进行辨析,相关政策与法律现状进行梳理,发现我国当前保障“双碳”目标存在专门法缺失、相关法的保障制度仍需完善、配套政策保障手段不足的问题。结合对法国、瑞典与德国三国的立法经验进行分析,基于我国国情,未来可以尝试于环境法典以可持续发展衔接“双碳”目标价值内涵,建立环境法典、单行法与政策的协同机制,推进“双碳”因素纳入环境影响评价与环境行政许可,合理衔接刑事责任的方式保障“双碳”目标的顺利实现。

“村规-村建-村管”联动的乡村建设路径探索——以浙江省余村乡村共同缔造实验为例

历史上长期的城乡二元制度,使得城与乡在土地使用和行政运行机制等方面存在巨大差异,使得我国在城镇建设中取得的巨大成功与经验难以复制到乡村建设领域。掺杂有城市规划思维烙印的村庄规划长期存在不实用、不适用,以及与村庄建设、村庄运营维护管理脱节的问题。通过对比乡村建设与城市建设的模式差异,以共同缔造理念为依托,在学界已有实践认知的基础上,提出围绕事权主体的“实用性”村庄规划、基于村民主体需求的“内生型”乡村建设行动和面向多元主体参与的“自治型”村规民约。按照“村规、村建、村管”的共同缔造路径,提出乡村建设的全过程治理策略,并以浙江省余村村庄规划为实验案例,对全过程治理策略进行了实证分析。