Optimization in the Migration Problem of Mobile Agents in Distributed Information Retrieval Systems

In this paper, we employ genetic algorithms to solve the migration problem (MP). We propose a new encoding scheme to represent trees, which is composed of two parts: the pre-ordered traversal sequence of tree vertices and the children number sequence of corresponding tree vertices. The proposed encoding scheme has the advantages of simplicity for encoding and decoding, ease for GA operations, and better equilibrium between exploration and exploitation. It is also adaptive in that, with few restrictions on the length of code, it can be freely lengthened or shortened according to the characteristics of the problem space. Furthermore, the encoding scheme is highly applicable to the degree-constrained minimum spanning tree problem because it also contains the degree information of each node. The simulation results demonstrate the higher performance of our algorithm, with fast convergence to the optima or sub-optima on various problem sizes. Comparing with the binary string encoding of vertices, when the problem size is large, our algorithm runs remarkably faster with comparable search capability. Key words distributed information retrieval - mobile agents - migration problem - genetic algorithms CLC number TP 301. 6 Foundation item: Supported by the National Natural Science Foundation of China (90104005), the Natural Science Foundation of Hubei Province and the Hong Kong Polytechnic University under the grant G-YD63Biography: He Yan-xiang (1952-), male, Professor, research direction: distributed and parallel processing, multi-agent systems, data mining and e-business.

基于微服务的企业综合管理信息系统(MIS)设计与实现

当前企业管理离不开相关数据的准确性和实时性,建设基于微服务的企业综合管理信息系统可增强企业管理信息能力,实现各部门整体工作的协同优化。采用微服务架构在设计和开发的过程中可实现服务的快速部署和更改,,SpringCloud框架是微服务架构中的集成,它将一系列优秀的组件进行整合,企业综合管理信息系统采用前后端分离的架构模式,前端基于VUE框架技术搭建,后端采用SpringBoot框架,前端和后端可并行开发,以便于维护和升级。基于微服务的企业综合管理信息系统为企业提供一个便捷、高效的平台,提升管理效率,对企业的快速发展具有重要意义。

Information Security in the Cloud: Emerging Trends and Challenges

This article explores the evolution of cloud computing, its advantages over traditional on-premises infrastructure, and its impact on information security. The study presents a comprehensive literature review covering various cloud infrastructure offerings and security models. Additionally, it deeply analyzes real-life case studies illustrating successful cloud migrations and highlights common information security threats in current cloud computing. The article concludes by offering recommendations to businesses to protect themselves from cloud data breaches and providing insights into selecting a suitable cloud services provider from an information security perspective.

Is salmonid migration at risk from chemical information disruption?

Good information is the basis for good decisions.For many invaluable salmon species,chemical information is necessary to guide and fine-tune their migrations to and from freshwater mating grounds.A problem is that salmon of the current world are running a gauntlet of toxic chemicals arising from diverse anthropogenic inputs and these chemicals are known to disrupt information.There is sufficient evidence that effluents from cities,mines,agriculture and industry contain chemicals that can rapidly,and sometimes irreversibly,impair the olfactory sense that salmon use to gather information.Some toxic inputs may not only be strong enough to impair migration,but be strong enough to redirect salmon away from their routes.There is also evidence that some synthetic chemicals may serve as the basis for ‘new’ information and be useful in making correct migratory decisions.On the plus side,there are examples of new regulations that limit the input of chemicals of known olfactory toxicity,but on the minus side,increased urbanization and global climate change will likely increase the number and/or severity of some neurotoxic inputs.Here we identify the specific avenues of chemical risks to information disruption and in so doing prioritize and rank the risks to migrating salmon.The data collected here can be used to lay the foundation for modelling the effects of anthropogenic inputs on information disruption in diverse salmonid species from around the world and therefore help secure their longevity in a changing chemical environment.

MiR-30b suppresses tumor migration and invasion by targeting EIF5A2 in gastric cancer

AIM: To elucidate the potential biological role of mi R-30 b in gastric cancer and investigate the underlying molecular mechanisms of mi R-30 b to inhibit metastasis of gastric cancer cells.METHODS: The expression of mi R-30 b was detected in gastric cancer cell lines and samples by reverse transcription-polymerase chain reaction. CCK-8 assays were conducted to explore the impact of mi R-30 b overexpression on the proliferation of gastric cancer cells. Flow cytometry was used to examine the effect of mi R-30 b on the apoptosis. Transwell test was used for the migration and invasion assays. Luciferase reporter assays and Western blot were employed to validate regulation of putative target of mi R-30 b.RESULTS: The results showed that mi R-30 b was downregulated in gastric cancer tissues and cancer cell lines and functioned as a tumor suppressor. Overexpression of mi R-30 b promoted cell apoptosis,and suppressed proliferation,migration and invasion of the gastric cancer cell lines AGS and MGC803. Bioinformatic analysis identified the 3'-untranslated region of eukaryotic translation initiation factor 5A2(EIF5A2) as a putative binding site of mi R-30 b. Luciferase reporter assays and Western blot analysis confirmed the EIF5A2 gene as a target of mi R-30 b. Moreover,expression levels of theEIF5A2 targets E-cadherin and Vimentin were altered following transfection of mi R-30 b mimics.CONCLUSION: Our findings describe a link between mi R-30 b and EIF5A2,which plays an important role in mediating epithelial-mesenchymal transition.

An Effective and Scalable VM Migration Strategy to Mitigate Cross-VM Side-Channel Attacks in Cloud

Co-residency of virtual machines(VMs) of different tenants on the same physical platform would possibly lead to cross-VM side-channel attacks in the cloud. While most of current countermeasures fail for real or immediate deployment due to their requirement for modification of virtualization structure, we adopt dynamic migration, an inherent mechanism of the cloud platform, as a general defense against this kind of threats. To this end, we first set up a unified practical information leakage model which shows the factors affecting side channels and describes the way they influence the damage due to side-channel attacks. Since migration is adopted to limit the time duration of co-residency, we envision this defense as an optimization problem by setting up an Integer Linear Programming(ILP) to calculate optimal migration strategy, which is intractable due to high computational complexity. Therefore, we approximate the ILP with a baseline genetic algorithm, which is further improved for its optimality and scalability. Experimental results show that our migration-based defense can not only provide excellent security guarantees and affordable performance cost in both theoretical simulation and practical cloud environment, but also achieve better optimality and scalability than previous countermeasures.

A novel SINR and mutual information based radar jamming technique

The improvements of anti-jamming performance of modem radar seeker are great threats to military targets. To protect the target from detection and estimation, the novel signal-to-interference-plus-noise ratio （SINR）-based and mutual information （Ml）-based jamming design techniques were proposed. To interfere with the target detection, the jamming was designed to minimize the S1NR of the radar seeker. To impair the estimation performance, the mutual information between the radar echo and the random target impulse response was used as the criterion. The spectral of optimal jamming under the two criteria were achieved with the power constraints. Simulation results show the effectiveness of the jamming techniques. SINR and MI of the SINR-based jamming, the MI-based jamming as well as the predefined jamming under the same power constraints were compared. Furthermore, the probability of detection and minimum mean-square error （MMSE） were also utilized to validate the jamming performance. Under the jamming power constraint of I W, the relative decrease of the probability of detection using S1NR-based optimal jamming is about 47%, and the relative increase of MMSE using Ml-based optimal jamming is about 8%. Besides, two useful jamming design principles are concluded which can be used in limited jamming power situations.

基于互信息和MiniRocket网络的CFST脱空识别

为提高钢管混凝土(concrete filled steel tube,CFST)脱空检测的效率和精度,本文提出了一种基于快速傅里叶变换(fast fourier transform,FFT)、互信息(mutual information,MI)和MiniRocket神经网络的智能识别方法。首先,采用FFT将待测CFST敲击声波时域信号转换为频域信号;其次,采用MI建立频域信号与脱空状态的相关性,提取相关性最大的前30个特征建立数据集,避免了复杂的数学运算和冗余信息;建立MiniRocket深度学习网络,通过使用更少的参数量和更小的特征尺寸,提高分类的速度和精度。最后,考察了模型的噪音鲁棒性,并与其他算法、特征提取方法和识别方法进行对比。结果表明,在不同脱空深度和脱空宽度下,所提的方法在100次重复试验中获得了100%的平均预测精度。在高信噪比下,该方法受影响较小。此外,与其他算法、特征提取方法和识别方法相比,本方法具有更好的预测性能。因此,所提出的方法在未来实际CFST结构的智能脱空识别中具有较大的应用潜力。

Interprovincial migration in China,1985-2005:a gravity modeling approach

This paper tries to identify the characters that might affect interprovincial migrants' decisions and examine how and why the influence of these characters changed over time individually and synthetically in China during 1985-2005.We have investigated six types of factors,namely,distance,population density,income,employment structure,house price,and migration stock.In addition,we apply the identified factors with a multiple stepwise regression model to a longitudinal dataset,which consists of interprovincial migration flows over the last two decades in China.It is found that different factors have disparate impacts on migration in China,and they can be decomposed into push force in origin area and pull force in destination area.Factors shaping China's interprovincial migration have shifted from traditional factors such as distance to economic factors such as income and employment structure.This paper suggests that more attention should be paid to obtain detailed migration data with spatial ihfonnation and develop applicable models for migration processes.Our analysis provides references for development planners and policymakers to develop sound population policies to achieve regional sustainable development in China.

Immigration in Portugal： An Approach to ＂Lusophone＂ Media System

The purpose of this essay is to discuss the ＂Lusophone＇＇l media system, inside the ＂Lusophone＂ migration system, from the perspective of data collected in an empirical work. For this purpose, we discuss the concept of ＂Lusophone＂ and ＂Lusophone＂ migration system, and we present the context of immigration in Portugal. The empirical work involved 14 in-depth interviews2 and started by presenting, in broad strokes, some important aspects relating to the history of ＂Lusophone＂. The analysis of the interviews was sustained in the theories of economic and political ＂world-system＂ developed by Braudel （1949） and Wallerstein （2004） and extended to the concept of migration systems of Kritz and Zlotnik （1992）. Their proposals were further developed by the Portuguese sociologist Baganha （2009） who defended the particularity of a ＂Lusophone＂ migration system. Based on those concepts, we describe the theoretical and empirical research and methodological procedures, stressing the trajectories of migration, social mobility and consumption of media and Information Communication Technologies （ICT）. We analyze the interviews, highlighting the similarities and differences, regarding the uses and consumptions of media and ICTs, between Brazilians and Finally based on the results, we discuss the characteristics the citizens from Portuguese-speaking African Countries of this ＂Lusophone＂ media system.

一种基于ASP技术的Web MIS安全系统的设计和实现

简要介绍了技术,通过总结体系结构下系统的开发经验,讨论了基于技术下的系统安全策略、 ASPBrowser/ServerMISASPWeb MIS安全系统的设计与实现方法。

基于Agent结构的MIS系统设计及实现

面向Agent(智能体)的程序设计是近十年来发展起来的一种新的软件技术方法,该文比较详细地介绍了两种基于Agent结构的MIS系统结构及其特点,并结合系统控制理论就MIS系统的控制模式进行了讨论,最后简单地介绍了在MIS中Agent的设计方法。

在煤炭资源管理中实现MIS和GIS的信息集成

以煤炭资源管理系统为例,介绍了管理信息系统与地理信息系统集成化开发的意义、实现原理,并讨论了基于DDE、OLE Automation和Active X构件集成化开发应用系统的方法。

我国MIS应用运行中的信息服务工作内容及管理制度

MIS应用运行中的信息服务内容除各级各类信息中心能按日、按月汇总数据并提供报表外,还应包括做基于业务数据的专题检索数据库,提供网页信息回溯性检索数据库,为预测和决策做咨询信息服务工作。据此,MIS运行管理部门要对信息服务进行相应的管理,而管理就要建立相应的管理制度。目前我国各级各类机构的MIS运行管理部门其信息服务工作并不十分令人满意,应对此进行相应的研究和探讨,以有利于提高我国MIS的应用效益。

上海交大基于校园网的MIS建设规划

针对上海交大多校区、地域分散的特点，介绍了基于Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ的管理信息系统建设规划。阐述了系统的建设目标、建设原则、子系统划分以及多层软件体系结构、分布处理技术、安全策略、ＤＣＯＭ／ＣＯＲＢＡ等技术在系统中的应用设计方案。

MIS一体化教学模式研究与实践

为适应现代素质教育的需要,在教学实践的基础上,针对MIS课程教学过程中的问题和难点,结合现代教育手段,构建了一个包括基于PBL思想的案例分析式理论教学、项目引导式实验教学和基于WBS思想的任务驱动式实践教学"三位一体"的MIS一体化特色教学模式。并进行了初步的教学实践,取得了良好的教学效果。

MIS系统中的预警机制

提出在ＭＩＳ系统中引入预警机制的新管理模式并给出了预警管理的实现方案。预警机制的应用，使管理信息系统显示出即时反应的活力，使管理更加智能化、规范化、制度化。实践结果表明，该文给出的解决方案是切实可行的，效果很好。

中小型企业MIS的通用用户管理模块设计

文章通过分析传统MIS的用户安全策略的利弊,提出了一种把MIS用户与WindowsNT用户集成的通用解决方案。它提高了MIS在用户管理方面的安全性和可靠性;其通用性可解决大多数中小型企业MIS对用户管理方面的需求。