无线网络虚拟化架构与关键技术

提出采用集中式和分布式的动态频谱管理技术来提升频谱资源利用效率,解决无线网络虚拟化中频谱资源难以高效分配与不易管理难题;认为为了构建一个稳定、灵活和开放的无线网络虚拟化架构,需要从虚拟网络的隔离、信令优化设计、通用接口设计、用户移动性管理等方面开展研究。     

Resource Allocation Scheme for Millimeter Wave–Based WPANs Using Directional Antennas

In this paper, we consider a resource allocation scheme for millimeter wave–based wireless personal area networks using directional antennas. This scheme involves scheduling the reservation period of medium access control for IEEE 802.15.3c. Objective functions are considered to minimize the average delay and maximize throughput; and two scheduling algorithms—namely, MInMax concurrent transmission and MAxMin concurrent transmission—are proposed to provide a suboptimal solution to each objective function. These are based on an exclusive region and two decision rules that determine the length of reservation times and the transmission order of groups. Each group consists of flows that are concurrently transmittable via spatial reuse. The algorithms appropriately apply two decision rules according to their objectives. A real video trace is used for the numerical results, which show that the proposed algorithms satisfy their objectives. They outperform other schemes on a range of measures, showing the effect of using a directional antenna. The proposed scheme efficiently supports variable bit rate traffic during the reservation period, reducing resource waste.     

Load Balancing Fat-Tree on Long-Lived Flows： Avoiding Congestion in a Data Center Network

In a data center network(DCN),load balancing is required when servers transfer data on the same path.This is necessary toavoid congestion.Load balancing is challenged by the dynamic transferral of demands and complex routing control.Because ofthe distributed nature of a traditional network,previous research on load balancing has mostly focused on improving the perfor-mance of the local network;thus,the load has not been optimally balanced across the entire network.In this paper,we propose anovel dynamic load-balancing algorithm for fat-tree.This algorithm avoids congestions to the great possible extent by searching fornon-conflicting paths in a centralized way.We implement the algorithm in the popular software-defined networking architectureand evaluate the algorithm’s performance on the Mininet platform.The results show that our algorithm has higher bisection band-width than the traditional equal-cost multi-path load-balancing algorithm and thus more effectively avoids congestion.     

Event Normalization Through Dynamic Log Format Detection

The analytical and monitoring capabilities of central event repositories, such as log servers and intrusion detection systems, are limited by the amount of structured information extracted from the events they receive. Diverse networks and applications log their events in many different formats, and this makes it difficult to identify the type of logs being received by the central repository. The way events are logged by IT systems is problematic for developers of host-based intrusiondetection systems(specifically, host-based systems), developers of security-information systems, and developers of eventmanagement systems. These problems preclude the development of more accurate, intrusive security solutions that obtain results from data included in the logs being processed. We propose a new method for dynamically normalizing events into a unified super- event that is loosely based on the Common Event Expression standard developed by Mitre Corporation.We explain how our solution can normalize seemingly unrelated events into a single, unified format.     

Attribute Based DRM Scheme with Dynamic Usage Control in Cloud Computing

In order to achieve fine-grained access control in cloud computing, existing digital rights management （DRM） schemes adopt attribute-based encryption as the main encryption primitive. However, these schemes suffer from inefficiency and cannot support dynamic updating of usage rights stored in the cloud. In this paper, we propose a novel DRM scheme with secure key management and dynamic usage control in cloud computing. We present a secure key management mechanism based on attribute-based encryption and proxy re-encryption. Only the users whose attributes satisfy the access policy of the encrypted content and who have effective usage rights can be able to recover the content encryption key and further decrypt the content. The attribute based mechanism allows the content provider to selectively provide fine-grained access control of contents among a set of users, and also enables the license server to implement immediate attribute and user revocation. Moreover, our scheme supports privacy-preserving dynamic usage control based on additive homomorphic encryption, which allows the license server in the cloud to update the users＇ usage rights dynamically without disclosing the plaintext. Extensive analytical results indicate that our proposed scheme is secure and efficient.     

Openstack Trove与沃云数据库即服务对比

Trove作为Openstack的数据库即服务组件,致力于实现高可用的资源隔离和数据库实例管理工作。文章对Openstack Trove和沃云数据库即服务平台的架构、组件及功能进行了全面综述,对Openstack Trove和沃云数据库即服务平台在数据库实例管理、元数据管理、备份功能等方面的差异进行对比,并指出Openstack Trove和沃云数据库即服务平台的演进趋势。     

中国联通创新业务“沃云”平台规划及实施

介绍中国联通"沃云"平台的规划及实施,分析传统业务平台存在的问题,阐述应用云计算技术的中国联通"沃云"平台的优势,以及运用"沃云"平台所带来的成果。     

新疆农职院教学管理系统的安全设计初探

基于降低新疆农职院教学管理系统被攻击和出错后能自我纠错的目的。采用软件工程的方法,进行对教学管理系统的业务流程分析、了解各种可能存在的安全风险,提出了对用户采用分层管理等解决方案。每层的用户权限有严格的规定,同时对系统管理员的权限有所限制。系统管理员是本系统权限最高,其次分别是教学秘书、教师和学生。得出结论,通过在本院应用该系统,由于提高了安全性能,使得该系统更加的稳健,免受不法分子的入侵,同时提高了工作效率。     

基于过程管理的顶岗实习与就业质量管理系统的研发

顶岗实习是职业院校工学结合、校企合作办学模式中重要的实践教学环节,在培养高技能人才过程中具有非常重要的作用.基于过程管理的顶岗实习与就业质量管理系统实现了对实习学生在企业顶岗实习期间全方位、全过程的管理和监控以及动态评价,提高了学生顶岗实习管理效率,保证了学生顶岗实习效果和质量.同时,系统收集、汇总实习学生的实习和就业信息的第一手资料,建立就业数据共享平台,有利于推动职业院校的教学管理和就业工作.本文叙述了该系统研发中的理念和思路以及所用到的关键技术.     

纯电动汽车热管理系统的研究

随着世界各国对环境问题的日益重视,纯电动汽车已受到社会各界的广泛青睐,而电动汽车的发展,很大程度上受电池热管理系统、电机和电机驱动热管理系统、空调热管理系统三大系统技术成熟度的制约.本文将从结构布置和控制方式方面研究讨论,提供建议,以减少电池能耗,增加续航里程、提升整车可靠性和舒适性,希望能为EV热管理系统设计提供借鉴和参考.