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基于DNA纳米技术的各种超分子体(功能单元),能实现信息存储、计算、移动和靶向送药等功能,其纳米结构的控制精度达到了原子级。基于DNA纳米技术的信息存储和计算模式,具有高度并行性、高密度和低能耗,天生适用于大量信息的存储和并行处理。面对这种新兴的计算模式,人们研究和开发了各种计算模型,讨论其对传统密码体系的影响和DNA存储信息的安全问题,包括密钥搜索、信息加密、信息隐藏及认证等。文章综述了基于DNA纳米技术的各种计算模型对传统加密算法的影响,概述了利用DNA纳米技术进行加密解密、认证签名的方案和技术,总结了当前基于DNA纳米技术的信息安全领域研究中存在的问题并展望了DNA计算及其在信息安全和存储领域的应用前景。 相似文献
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Blockchain technology provides us a new tool to solve the product traceability problem in supply chain management. This research focuses on the cross-border e-commerce context, to propose a blockchain-based framework, and develop a set of corresponding techniques and methods for achieving traceable products and transactions in supply chain management. A general blockchain-based product traceability framework is introduced. This framework is based on a cross-border e-commerce supply chain context, incorporating a series of blockchain-based models, including multi-chain structure model, data management model and block structure model. Several core methods and algorithms are also developed, such as information anchoring method, key distribution method, information encryption algorithm and anti-counterfeiting method. The framework, models and methods form a complete and comprehensive solution, which are evaluated by applying to several typical problems and attack cases. The case analysis results show that the framework, models and methods can successfully deal with key recover problem, and protect against clone attack, counterfeit tag attack and counterfeit product attack. The effectiveness, extendibility, security, implementation and governance issues of applying these solutions are also discussed. This research contributes to the theoretical and practical literatures on blockchain technology, cross-border e-commerce and supply chain management research fields. 相似文献
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信号与系统课程是电子信息类专业的核心基础课程,在各种经典教材中都采用冲激响应匹配法求解微分方程零时刻的跳变值。本文分析了冲激响应匹配法求解跳变问题存在的问题,提出了一种应用laplace变换求解跳变问题的新方法,简述了此种方法的原理和求解过程。多年的教学经验表明这种方法更简单,更易让学生掌握。 相似文献
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本文在对产品全生命周期质量信息进行调研的基础上,采用面分类法和线分类法相结合的方式对质量信息进行了分类,得到质量信息分类体系,在此基础上对质量信息进行编码,并开发了相应的计算机辅助分类编码系统,有效地解决了机械制造企业信息化过程中质量信息的交流与共享问题。 相似文献
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在采用带精英保留策略的进化算法求解多目标优化问题时,我们需要一个文档来保存在进化过程中产生的不被占优的解。当互不占优的解的数量超过文档的大小时,如何在互不占优的解之间取舍将变得非常重要。针对传统的文档更新策略只考虑解的分布性的情况,提出了一种能够同时保证分布性和收敛性的文档更新策略。该文档更新策略以超体积为基础,与目前经典算法NSGA-Ⅱ进行比较,结果表明新算法拥有良好的分布性,同时也较好地保证了收敛性。 相似文献
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This paper deals with the problem of finding graphs (directed and undirected) maximizing the number of spanning trees among the regular graphs with the same number of nodes and edges. The approach is based on heuristic algorithms such as k-optimal and evolutionary. The emphasis is rather on checking whether these techniques are applicable to solving extremal graph problems than investigating generic structures of optimal graphs. For this reason circulant graphs, for which computationally effective tree counting formulas exist, are discussed first and then the results extended to cover the class of regular graphs. 相似文献
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偏好DEA在科研机构相对效率评价中的应用 总被引：3，自引：0，他引：3
科研机构的科学评价对资源的合理配置及科研产出的提高作用很大.但机构的不同领域、不同学科的特点使得机构之间难以比较,DEA正好是解决这一问题的有效方法.针对科研机构评价中应用标准CCR模型及其变形、偏好CCR模型等问题进行了分析,给出了解决方案,特别针对偏好CCR模型评价信息不够丰富的弱点,提出了偏好BCC模型,结合这两种偏好模型,可进行技术效率、纯技术效率、规模效率、规模收益状况的分析.最后将此模型应用于中科院高技术类研究所的科研相对效率评价,得出对决策者有启示的结论. 相似文献
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企业反竞争情报能力研究 总被引：2，自引：0，他引：2
企业反竞争情报能力涉及企业信息安全控制分析、反竞争情报策略的制定、反竞争情报策略的实施以及反竞争情报策略的控制等四方面能力;企业信息安全控制分析能力涉及秘密信息确定、信息安全威胁分析、信息安全隐患分析和信息安全风险评估等能力;反竞争情报策略的制定能力包括针对企业内部泄密、第三方渠道泄密、公开出版物泄密、信息技术泄密和不道德途径泄密等方面制定策略的能力;反竞争情报策略的实施能力涉及监测竞争对手、防御竞争对手和反击竞争对手等能力;反竞争情报策略的控制能力涉及情报自身、情报过程、人和情报系统等的控制能力. 相似文献
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《Information processing & management》2022,59(1):102769
This study aims at helping people recognize health misinformation on social media in China. A scheme was first developed to identify the features of health misinformation on social media based on content analysis of 482 pieces of health information from WeChat, a social media platform widely used in China. This scheme was able to identify salient features of health misinformation, including exaggeration/absolutes, induced text, claims of being unique and secret, intemperate tone or language, and statements of excessive significance and likewise. The scheme was then evaluated in a user-centred experiment to test if it is useful in identifying features of health misinformation. Forty-four participants for the experimental group and 38 participants for the control group participated and finished the experiment, which compared the effectiveness of these participants in using the scheme to identify health misinformation. The results indicate that the scheme is effective in terms of improving users’ capability in health misinformation identification. The results also indicate that the participants’ capability of recognizing misinformation in the experimental group has been significantly improved compared to those of the control group. The study provides insights into health misinformation and has implications in enhancing people's online health information literacy. It informs the development of a system that can automatically limit the spread of health misinformation. Moreover, it potentially improves users’ online health information literacy, in particular, under the circumstances of the COVID-19 pandemic. 相似文献
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《Information processing & management》2022,59(5):103005
In real-life applications, resources in construction projects are always limited. It is of great practical importance to shorten the project duration by using intelligent models (i.e., evolutionary computations such as genetic algorithm (GA) and particle swarm optimization (PSO) to make the construction process reasonable considering the limited resources. However, in the general EC-based model, for example, PSO easily falls into a local optimum when solving the problem of limited resources and the shortest period in scheduling a large network. This paper proposes two PSO-based models, which are resource-constrained adaptive particle swarm optimization (RC-APSO) and an input-adaptive particle swarm optimization (iRC-APSO) to respectively solve the static and dynamic situations of resource-constraint problems. The RC-APSO uses adaptive heuristic particle swarm optimization (AHPSO) to solve the limited resource and shortest duration problem based on the analysis of the constraints of process resources, time limits, and logic. The iRC-APSO method is a combination of AHPSO and network scheduling and is used to solve the proposed dynamic resource minimum duration problem model. From the experimental results, the probability of obtaining the shortest duration of the RC-APSO is higher than that of the genetic PSO and GA models, and the accuracy and stability of the algorithm are significantly improved compared with the other two algorithms, providing a new method for solving the resource-constrained shortest duration problem. In addition, the computational results show that iRC-APSO can obtain the shortest time constraint and the design scheme after each delay, which is more valuable than the static problem for practical project planning. 相似文献
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以我国航空装备制造企业为研究对象,建立了企业外部知识获取、企业内部知识共享能力、企业技术能力和企业转包绩效之间关系的理论模型,提出了11种研究假设。采用问卷调查和实地调研的方式对我国20家实施航空产品转包生产的航空制造类企业进行调查访问。运用SPSS17.0和AMOS7.0统计软件对回收的232份问卷中的各项指标变量进行因子分析和拟合度检验。结果表明,面对面交流和编码信息共享的知识获取方式对组织内部知识共享方式和企业技术能力存在显著正向影响;虚拟对话交流的知识获取方式对组织内部知识共享方式存在显著正向影响;组织内部知识共享方式与企业技术能力和企业转包绩效之间存在显性正向影响;企业技术能力与企业转包绩效之间存在显性正向影响。 相似文献
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为提高城轨线路应急能力,快速决策并有效应对突发事件,通过引入反馈机制,基于最小偏差原理求得反馈权重,进而根据主观权重、客观权重和反馈权重推算综合权重,构建改进的TOPSIS模型,结合城轨线路应急能力评价指标体系展开实证研究,并将决策评价结果与以往研究进行比较,验证该模型的合理性和科学性。研究结果表明,改进的TOPSIS模型能够克服传统TOPSIS方法的问题和不足,既可以充分发挥以往决策执行效果在后续决策中的影响作用,且能保证评价方案的排序与决策更符合实际,又能识别影响城市轨道交通应急能力的重要因素,优化后续决策方案,为城轨线路及其他问题的应急能力决策优化提供新思路。 相似文献
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The use of lower-order models in obtaining approximate solutions in optimal control problems has been of much interest during the past few years. Two new procedures for order reduction, based on interpreting the system impulse response (or transfer function) as an input–output map, are presented. The relationship between the states of the original system and the states of its reduced-order model is investigated. The lower-order model is used to obtain suboptimal controllers in linear regulator problems. Several computational examples are given. 相似文献
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提出了一种新的基于椭圆曲线密码体制的（t,n）动态秘密共享方案。该方案具有以下特点：参与者能自主选择子密钥;在进行一次秘密恢复后,不会泄露关于子密钥的任何信息,子密钥仍可用恢复于下一个共享的秘密;参与者的子密钥可定期更新,且更新工作由每个参与者独立完成。与传统的多秘密共享方案相比,该方案具有更高的安全性和灵活性。 相似文献
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随着计算机信息科学不断发展、信息社会逐渐成熟,信息管理与信息系统专业受到了极大挑战:课程设置宽泛多样,但学生实践与创新能力不足。大部分毕业生并未实现专业规划 "成为高级专门人才"的培养目标。本文从信管专业课程设置和知识结构入手,分析现有知识结构存在的问题,提出依托现有知识结构从专业实践环节解决问题并提高学生创新能力,包括独立实践环节和课程实践环节的设置与安排。 相似文献
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赶超型国家的成长型技术跨越——浙大中控的技术跨越案例研究 总被引：1，自引：0，他引：1
技术跨越的过程就是一个技术能力跨越的过程,本文主要研究了发展中国家的成长型技术跨越和技术能力发展轨迹,并进行了综合案例分析。对于发展中国家而言,存在着以引进模仿吸收为核心和以自主创新为核心的两种技术能力积累模式。技术能力的积累体现出一个成长型的轨迹,这实际上是成长型技术跨越的机理所在。而在对浙大中控的案例研究剖析中进一步发现,协调的技术能力积累、技术融合和自主核心技术对技术跨越的重要性。 相似文献
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现代计算机网络面临着信息泄露、黑客攻击、病毒感染等多种威胁,使用密码学可以保障信息的机密性和完整性,防止信息被篡改、伪造。本文概括介绍了密码学在现代网络信息安全体系建设中的地位,同时对如何合理地利用密码学技术来保障网络信息安全进行了分析。 相似文献