Distributed Timestamp Mechanism Based on Verifiable Delay Functions

In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered with.Therefore,maintaining data security is one of the most important issues in network data communication.Because the timestamp is the most impor-tant way to authenticate data in information interaction,it is very necessary to pro-vide timestamp service in the data communication system.However,the existing centralized timestamp mechanism is difficult to provide credible timestamp ser-vice,and users can conspire with timestamping servers to forge timestamps.Therefore,this paper designs a distributed timestamp mechanism based on contin-uous verifiable delay functions.It utilizes multiple independent timestamp servers to provide timestamp services in a distributed model and appends the timestamp to the data once the data is generated.Thus,it can prove that the data already exists at a certain time and ensure the accuracy of the timestamp.Moreover,a digital blind signature based on elliptic curve cryptography is utilized to solve the problem of timestamp forgery in timestamp service.Finally,the security ana-lysis of the scheme ensures the data security of data communication system and the concurrency rate of timestamp.The experimental results also show that the scheme greatly improves the efficiency of digital signatures.

Favorable lithofacies and pore characteristics of the Permian Longtan Formation shale in the southern Sichuan Basin

The marine–continental transitional shale (MCTS) reservoirs of the Longtan Formation (LTF) are widely distributed in the Sichuan Basin. However, the LTF shale exhibits considerable variations in mineral composition and pore characteristics, which makes identifying the 'sweet spot'a challenging task. To address this issue, 10 samples from four typical shale gas wells in the LTF in the southern Sichuan Basin were selected and analyzed for total organic carbon (TOC) content, whole-rock composition using X-ray diffraction (XRD), low-pressure gas adsorption, and high-pressure mercury intrusion. The lithofacies distribution and pore structure of the MCTS were studied to determine the pore structural characteristics and the primary factors influencing pore formation in different types of shale lithofacies in the LTF. The lithofacies of the LTF shale in the study area can be classified into three categories: siliceous clay shale, clay shale and mixed shale. Mineral content has a significant impact on the pore characteristics, while TOC content has a minor effect on the pore volume and specific surface area of micropores and mesopores. It can be inferred that the mesopores in the MCTS are mainly related to clay mineral pores, and mineral dissolution and TOC content are not the primary factors contributing to pore formation.

ABLE中的决策树算法的模糊因子改进方法

主体构建和学习环境(ABLE)是IBM开发的用于支持主体建模、构建多主体系统的框架.本文改进了ABLE的决策树算法,在其中计算属性的信息增益时加入一个模糊因子,使算法能更简单、有效地学习.在UCI数据集上的测试结果表明改进后的算法在不降低精度的前提下,可以生成更简洁的决策树,特别是处理复杂的数据时,可显著降低规则数目.

基于语义角色的英语V+able型形容词的语义指向探索

英语V+able型形容词在语义上与什么样的名词性成分产生关联,是中国英语学习者的一个难点。运用汉语研究中的语义指向理论,并借助生成语法的语义角色理论,对英语该类形容词的语义指向进行了分类探讨,认为其语义指向与V所联系的句法成分和所蕴含的语义角色有较为直接的关系,并从认知的角度说明了这类形容词某些理论上存在的语义指向实际上无法成立的原因。

构建ABLE城市 促进CBD向ABC转换——从东京丸之内再开发看现代CBD的发展趋势

东京丸之内中央商务区是承担日本经济中枢的商务区,在经历了上世纪六七十年代高速成长后,已成为日本的"形象"。在当今竞争日益激烈的全球化背景下,丸之内中央商务区积极应对挑战,开始着手对本地区的基础设施和建筑物进行第三次大规模的再开发,并将其作为实现"东京都危机突破战略"的重要抓手。本文通过对丸之内再开发战略的分析和研究,揭示了现代CBD的发展趋势,并以此为基础,对上海陆家嘴CBD建设加以思考,提出改进和突破的对策。

Analysis of elastoplasticity problems using an improved complex variable element-free Galerkin method

In this paper, based on the conjugate of the complex basis function, a new complex variable moving least-squares approximation is discussed. Then using the new approximation to obtain the shape function, an improved complex variable element-free Galerkin（ICVEFG） method is presented for two-dimensional（2D） elastoplasticity problems. Compared with the previous complex variable moving least-squares approximation, the new approximation has greater computational precision and efficiency. Using the penalty method to apply the essential boundary conditions, and using the constrained Galerkin weak form of 2D elastoplasticity to obtain the system equations, we obtain the corresponding formulae of the ICVEFG method for 2D elastoplasticity. Three selected numerical examples are presented using the ICVEFG method to show that the ICVEFG method has the advantages such as greater precision and computational efficiency over the conventional meshless methods.

ABLE:Agent构建和学习环境

文章描述的A gent构建和学习环境(ABLE)是基于Java的A gent开发框架,用于开发和配置混合型智能A gent和A gent应用.它提供了一个可重用的组件库,包含:数据访取、机器学习、机器推理和优化算法,这些算法都以JavaBean形式打包,定义为A b leBean,并提供了几种灵活的连接方法将A b leBean连接成一个软件A gent.此外,ABLE还提供了一个基于Sw ing的图形化用户接口,用户可以在图形界面上创建并配置A b leBean,并进一步构建和测试由这些A b leBean所构成的A gent.

英语后缀-able初探

—able(—ible)是英语中最常用的后缀之一。我们在阅读英语书刊或广告说明书等都会见到带后缀—able(—ible)的词,如:in every way possible(用各种可能的方法)comfortable living(舒适的生活),easily digestible(易于消化的),favourable,condition(有利的条件)等等。由于它的使用频率很高,故引起了英语研究者的注意。本文就—able(ible)这一后缀的意义、来源、构成词的形式,特征等作一初步探讨。

基于语料库的英语准情态动词be able to情态意义研究

英语情态动词一直以来被认为是"最重要、最难描写"的体系,准情态动词作为其中不可或缺的组成部分,具有形式多样、涵义丰富的特点,与核心情态动词相比,其使用率呈明显上升趋势。语料库及现代检索工具的出现为英语情态动词的研究提供了新的视角和手段。本文将研究对象转向准情态动词,以be able to为例,对其情态意义进行了界定辨析及历时研究,以期开拓情态动词研究的新局面。

Tunable surface plasmon-polariton resonance in organic light-emitting devices based on corrugated alloy electrodes

We report a feasible method to realize tun able surface plasm on-polarit on(SPP)res onance in orga nic light-emitt ing devices(OLEDs)by emplo ying corrugated Ag-Al alloy electrodes.The excited SPP res onance in duced by the periodic corrugations can be precisely tuned based on the composition ratios of the Ag-Al alloy electrodes.With an appropriate composition ratio of the corrugated alloy electrode,the photons trapped in SPP modes are recovered and extracted effectively.The 25%in creaseme nt in luminance and 21%enhan ceme nt in curre nt efficie ncy have bee n achieved by using the corrugated Ag-Al alloy electrodes in OLEDs.

Able群上Cayley图的哈密顿性(英文)

设 G是群 ,S是 G的不含单位元的子集 ,满足 S=S1 ,G的相对于 S的 Cayley图 ,是一个以 G为顶点集的无向图 ,对 G的任意两上元 x和 y,x和 y在 C( G,S)中相邻 ,当且今当 x1 y∈ S.本文中我们得到了以下结论 :( i)设 G是阶至少为 2的有限 Abel群 .S G\{ 0 }且 S=S1 ,则 C( G,S)中每个二长路都包含在一个哈密顿圈中 .( ii)设 G是可数无限 Abel群 ,S G\{ 0 }满足 S=S1 和 | S|≥ 4 .则 C( G,S)中每个长为 2的路含在一条双向哈密顿路上 .( iii)有限 Abel群上围长为 3,阶数至少为 3的连通 Cayley图是泛圈的 .( iv)设 G是可数无限 Abel群 ,S G\{ 0 }满足 S=S1和 | S|≥ 4 .若 girth[C( G,S) ]=3,则 C( G,S)是泛圈的 .

基于ABLE语言的数字密码锁的设计与实现

本设计用CPLD设计制作一个数字密码锁控制电路。设计以使用简单，调整方便，功能完备为目的．采用lattice公司的IspLS1032E-70IJ可编程器件，以ABLE语言为开发语言，设计并实现具备密码的输入、修改、开锁指示、错误报警等功能的数字密码电路。

漫话形容词后缀-able

一、在英语里—able及其变体—ible是一个生成能力很强的形容词后缀,它可以加在绝大多数及物动词的后面形成派生形容词。如: adapt 适应 adaptable 能适应的 predict 预言 predictable 可预言的 replace 替换 replaceable 可替换的 resist 抵抗 irrisistable 不可抗拒的这类形容词的生成过程可以总结成下面的公式:

Able公式及其在数列求和中的应用

本文主要讨论Able和差变换公式在数列求和中的应用。

英语“V+able”形容词化的词义变化类型及其翻译研究

本文基于权威词典,聚焦英语"V+able"形容词,研究其形容词化的词义变化、词义类型及其翻译。研究发现,第一,该类形容词和词根之间的词义滞留程度不一,存在词义不变、词义转移、词义扩大、词义缩小等四种现象;第二,由于不同的认知机制,"V+able"形容词的词义类型包括主观可行型、易化程度型、事物性质型和感觉连通型等四种;第三,"V+able"形容词大多数折射词根动词的核心词义,所以我们可以凭借词根义进行翻译。但是,有部分形容词需要通过语境来解读它的词义,如多词义型和非词根义型。

从“able”一词看“相似论”在英语词汇教学中的运用

"相似论"是指相似的理论。所谓"相似"是指"客观事物存在的同与变异矛盾的统一"。英语词汇教学存在着同与变异。因为"同"词汇教学才有的规律;因为"变异",词汇教学才能有所拓展。通过与"able"一词的"同",找到词汇教学相应的规律;通过与"able"一词的"变异",使词汇教学举一反三,触类旁通,由此及彼。

Build Autonomic Agents with ABLE

The IBM Agent Building and Learning Environment(ABLE) provides a lightweight Java^(TM) agent frame- work,a comprehensive JavaBeansTM library of intelligent software components,a set of development and test tools, and an agent platform.After the introduction to ABLE,classes and interfaces in the ABLE agent framework were put forward.At last an autonomic agent that is an ABLE-based architecture for incrementally building autonomic systems was discussed.

Analysis on Long-Term Care and Influencing Factors of Empty-Nest Differently Abled Elderly People in China —Based on the Data from the Chinese Longitudinal Healthy Longevity Survey

Purpose: This study aimed to understand the actual needs of empty-nest differently abled elderly people and analyze their long-term care status including the factors affecting choice of care mode so adequate resources can be allocated to meet their healthcare needs. Methods: An empty-nest group was compared with a non-empty-nest group based on data from the 2014 Chinese Longitudinal Healthy Longevity Survey. Individual characteristics, family characteristics, and sociological factors were considered as independent variables, and long-term care model was the dependent variable in the three binary logistic regression method. Results: Age, gender, marriage, and disability were the most important factors influencing the choice of long-term care mode, including the willingness of the differently abled elderly. Family care can no longer meet the needs of the severely disabled elderly. Long-term care for such elderly people should be undertaken by professional and specialized social institutions. Conclusion: Multi-level services should be provided according to the elderly peoples’ needs, and the skill and expertise of professional personnel of care institutions should be strengthened. The government should deploy fund-raising initiatives, actively use the power of non-governmental organizations, and strive to resolve the financial issues faced by the empty-nested elderly people with disability.

论英语后缀-able

本文作者根据取自英美书刊的大量的第一手资料,和在对国内外专家的有关观点进行综述的基础上,对含有—able后缀的英语形容词从构成、语义、句法特征以及习惯用法诸方面进行了探讨。指出:虽然作为一个活用的后缀,—albe在现代英语里是主要表被动的意义,但就其构成、语义及用法来说,实际情况是颇为复杂的,它所表示的概念往往是具有灵活性的,它或'一词多义',或具有特殊的被动意义,或具有主动意义,或则既含主动又含被动的意义。文章还指出了—able形容词所经历的历史性演变及今后继续变化的潜在可能性。