检索结果-南通市图书馆

Lightweight SOA-Based Twin-Engine Architecture for Enterprise Systems in Fixed and Mobile Environments

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

china Communications 2016年第9期13卷 183-194页

作者： Tongguang Zhang Shuai zhao Budan Wu Maurizio Farina Bo cheng {2. chen state key {2. of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China Adaptive Software Company Via Posillipo 255Naples 80123Italy

Mobile devices as a popular computing platform for enterprise systems have enabled certain tasks to be executed out of ***,the work may be interrupted due to the server shutdown or network disconnection when employees access traditional single-engine Business Process Management *** overcome this defect,we present a lightweight twin-engine architecture based on Service Oriented Architecture(SOA).In this paper,we discuss in detail the design and implementation of the architecture,and present a trigger mechanism to activate engines according to the states of hybrid environments since it is critical for the two types of engines to cooperate closely in hybrid environments with fixed and mobile computing *** experimental results validate the usability of the architecture.

关键词： twin-engine SOA enterprise system mobile environment

MobiGemini:Sensitive-Based Data and Resource Protection Framework for Mobile Device

在线全文

学校读者我要写书评

暂无评论

china Communications 2017年第7期14卷 67-77页

作者： Shuangxi Hong chuanchang liu Bo {2.g Bingfei Ren junliang {2. state key {2. of networking and switching technology Beijing University of Posts and Telecommunications

With the popularity of smartphones and the rapid development of mobile internet, smartphone becomes an important tool that store sensitive data of owner. Encryption naturally becomes a necessary means of protection. In certain situations, this is inadequate, as user may be coerced to hand over decryption keys or passwords of sensitive APP(Ali Pay) on mobile device. Therefore, only encryption cannot protect sensitive APP and privacy data stored on user's smartphone. To address these obstacles, we design a protection system called Mobi Gemini. It enables automatic uninstalling service that can immediately uninstall multiple APP at same time, and also enabling plausibly deniable encryption(PDE) on mobile devices by hiding encrypted volume within random data in free space of cache partition. We improve the key store way of previous PDE schemes on mobile device. The evaluation results show that the scheme introduces a few overhead compared with original android system enabling full disk encryption.

关键词： mobile security privacy protection storage encryption deniable encryption

An MID-Based Load Balancing Approach for Topic-Based Pub-Sub Overlay Construction

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and technology 2011年第6期16卷 589-600页

作者： Ruisheng Shi Fuqiang liu Yang Zhang Bo cheng {2. chen state key {2. of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China Naval Academy of Armament Beijing 100073 China

A large proportion of Internet of Things （loT） applications are internally publish/subscribe in nature, and traditional architecture cannot support them efficiently and flexibly. In essence, supporting efficient publish/subscribe systems requires data-oriented naming and efficient multicast. Since deployment of native IP-based multicast has failed, overlay-based multicast has become the practical choice. Since load balancing between heterogeneous nodes is an important issue, designing an optimal load balancing overlay net- work for publish/subscribe systems is a necessary endeavor. This study focuses on the optimal load balancing overlay design problem for topic-based publish/subscribe systems in a heterogeneous environment （in terms of node processing power, bandwidth, and reachability）. The Minimum Idle Degree （MID） model is introduced to capture the heterogeneity of overlay nodes. Based on the MID model, new node load measures are defined that can accommodate heterogeneous server capacities and capture the node load in publish/subscribe systems more accurately than traditional measures. A new optimization problem, Maximum Minimum Idle Degree Topic-Connected Overlay （MMID-TCO）, is established. This problem is NP-complete and a constant approximation algorithm does not exist for this problem （unless P=NP）. Based on MID metrics, the Maximum Minimum Idle Degree Overlay Design Algorithm （MMID-ODA）, which has polynomial time is introduced. To improve performance, an approach that breaks down the problem into several small-scale problems by exploiting the potential inherent disjoint characteristic in the subscription table is presented. Simulation results show that the proposed algorithm is able to achieve better load balance than MinMax-ODA in a heterogeneous environment.

关键词： optimal problem load balancing heterogeneity topic-based publish/subscribe

Cross-Layer QoS Enabled SDN-Like Publish/Subscribe Communication Infrastructure for IoT

在线全文

学校读者我要写书评

暂无评论

china Communications 2020年第3期17卷 149-167页

作者： Yulong Shi Yang Zhang junliang chen state key {2. of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Publish/subscribe paradigm is often adopted to create the communication infrastructure of the Internet of Things(IoT)for many clients to access enormous real-time sensor ***,most current publish/subscribe middlewares are based on traditional ossified IP networks,which are difficult to enable Quality of Service(QoS).How to design the next generation publish/subscribe middleware has become an urgent *** emerging Software Defined networking(SDN)provides new opportunities to improve the QoS of publish/subscribe facilities for delivering events in IoT owing to its customized programmability and centralized *** can encode event topics,priorities and security policies into flow entries of SDN-enabled switches to satisfy personalized QoS *** this paper,we propose a cross-layer QoS enabled SDN-like publish/subscribe communication infrastructure,aiming at building an IoT platform to seamlessly connect IoT services with SDN networks and improving the QoS of delivering *** first present an SDN-like topic-oriented publish/subscribe middleware architecture with a cross-layer QoS control *** we discuss prototype implementation,including topic management,topology maintenance,event routing and policy *** the end,we use differentiated services and cross-layer access control as cross-layer QoS scenarios to verify the *** results show that our middleware is effective.

关键词： IoT publish/subscribe software defined networking quality of service middleware

Mobile Web Augmented Reality in 5G and Beyond:Challenges, Opportunities, and Future Directions

在线全文

学校读者我要写书评

暂无评论

china Communications 2019年第9期16卷 141-154页

作者： Xiuquan Qiao Pei Ren Guoshun Nan Ling liu Schahram Dustdar junliang {2. state key {2. of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China College of Computing Georgia Institute of TechnologyAtlantaGA 30332USA Distributed Systems Group TU Wien1040 ViennaAustria

The popularity of wearable devices and smartphones has fueled the development of Mobile Augmented Reality(MAR),which provides immersive experiences over the real world using techniques,such as computer vision and deep ***,the hardware-specific MAR is costly and heavy,and the App-based MAR requires an additional download and installation and it also lacks cross-platform *** limitations hamper the pervasive promotion of *** paper argues that mobile Web AR(MWAR)holds the potential to become a practical and pervasive solution that can effectively scale to millions of end-users because MWAR can be developed as a lightweight,cross-platform,and low-cost solution for end-to-end delivery of *** main challenges for making MWAR a reality lie in the low efficiency for dense computing in Web browsers,a large delay for real-time interactions over mobile networks,and the lack of *** good news is that the newly emerging 5G and Beyond 5G(B5G)cellular networks can mitigate these issues to some extent via techniques such as network slicing,device-to-device communication,and mobile edge *** this paper,we first give an overview of the challenges and opportunities of MWAR in the 5G *** we describe our design and development of a generic service-oriented framework(called MWAR5)to provide a scalable,flexible,and easy to deploy MWAR *** evaluate the performance of our MWAR5 system in an actually deployed 5G trial network under the collaborative configurations,which shows encouraging ***,we also share the experiences and insights from our development and deployment,including some exciting future directions of MWAR over 5G and B5G networks.

关键词： 5G edge computing augmentedreality mobile augmented reality Web augmentedreality

An SDN-Based Publish/Subscribe-Enabled Communication Platform for IoT Services

在线全文

学校读者我要写书评

暂无评论

china Communications 2018年第1期15卷 95-106页

作者： Yali Wang Yang Zhang junliang chen state key {2. of networking and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China College of Computer and Information Engineering Henan Normal University Xinxiang Henan 453007 China

Publish/subscribe paradigm paves a way to integrate and serve many scalable, inter-operable Internet of Things(IoT) applications. The increasing IoT applications require new properties of publish/subscribe communication model, for example, strict quality of service(Qo S) guarantees, supporting a large number of widely distributed devices, etc. Software Defined networking(SDN) enables personalized programming and individualized QoS supports for different applications. The combination of the two will have a good prospect. In this paper, we present an IoT-oriented communication platform which combines the publish/subscribe paradigm with SDN, aiming at establishing an IoT ecosystem to facilitate IoT services/applications accessing internet. We design the interaction logic of topic-based publish/subscribe middleware, and describe the setup and maintenance of topology information as well as event routing in detail, considering the characteristics of SDN. Finally, we exemplify its practicability with a deployed District Heating Control and Information Service System(DHCISS) and validity the effectiveness with some experiments.

关键词： IoT publish/subscribe paradigm QoS guarantee software defined networking

Enhancing Collaborative Filtering via Topic Model Integrated Uniform Euclidean Distance

在线全文

学校读者我要写书评

暂无评论

china Communications 2017年第11期14卷 48-58页

作者： Tieliang Gao Bo cheng junliang chen Ming chen state key {2. of networking and switching technology Beijing University of Posts and Telecommunications School of Business Xinxiang University Software Engineering College Zhengzhou University of Light Industry

Recommendation system can greatly alleviate the "information overload" in the big data era. Existing recommendation methods, however, typically focus on predicting missing rating values via analyzing user-item dualistic relationship, which neglect an important fact that the latent interests of users can influence their rating behaviors. Moreover, traditional recommendation methods easily suffer from the high dimensional problem and cold-start problem. To address these challenges, in this paper, we propose a PBUED(PLSA-Based Uniform Euclidean Distance) scheme, which utilizes topic model and uniform Euclidean distance to recommend the suitable items for users. The solution first employs probabilistic latent semantic analysis(PLSA) to extract users' interests, users with different interests are divided into different subgroups. Then, the uniform Euclidean distance is adopted to compute the users' similarity in the same interest subset; finally, the missing rating values of data are predicted via aggregating similar neighbors' ratings. We evaluate PBUED on two datasets and experimental results show PBUED can lead to better predicting performance and ranking performance than other approaches.

关键词： recommendation system topic model user interest uniform euclidean distance

Modeling and Analysis of Data Dependencies in Business Process for Data-Intensive Services

在线全文

学校读者我要写书评

暂无评论

china Communications 2017年第10期14卷 151-163页

作者： yuze huang jiwei huang budan wu junliang chen state key {2. of networking and switching technology beijing university of Posts and telecommunications Beijing 100876 China

With the growing popularity of data-intensive services on the Internet, the traditional process-centric model for business process meets challenges due to the lack of abilities to describe data semantics and dependencies, resulting in the inflexibility of the design and implement for the processes. This paper proposes a novel data-aware business process model which is able to describe both explicit control flow and implicit data flow. Data model with dependencies which are formulated by Linear-time Temporal Logic(LTL) is presented, and their satisfiability is validated by an automaton-based model checking algorithm. Data dependencies are fully considered in modeling phase, which helps to improve the efficiency and reliability of programming during developing phase. Finally, a prototype system based on j BPM for data-aware workflow is designed using such model, and has been deployed to beijing Kingfore heating management system to validate the flexibility, efficacy and convenience of our approach for massive coding and large-scale system management in reality.

关键词： data-aware business process data-intensive services data dependency linear-time temporal logic(LTL) services computing

Exploring Application Layer Protocol Relationships in SoftSwitch

在线全文

学校读者我要写书评

暂无评论

china Communications 2009年第4期6卷 155-167页

作者： Zhu Xiaomin Liao Jianxin chen junliang Li Tonghong state key Lab of {2. and switching technology Beijing University of Posts and Telecommunications Beijing 100876 China EBUPT Information technology Co. Ltd. Beijing 100191 China Technical university of Madrid 28660 Madrid Spain

Relationships between application layer protocols in softswitch are explored in this *** notions, *** relationship and protocol grouping, are proposed, which are not clearly defined and even not paid much attention to *** the basis of a well known protocol relationship named protocol conversion, three novel protocol relationships including protocol collaboration relationship, protocol cooperation relationship and protocol independent relationship are presented, so that protocol relationships are classified into four *** to the functionality and purpose of each protocol, main protocols related to softswitch are divided into five *** to protocol conversion in softswitch, information flow trail(IFT) is utilized to facilitate problem solving.A decision rule for protocol conversion mode is proposed to guide how to choose between direct conversion and indirect conversion.A property of protocol relationships in softswitch is induced from all kinds of service scenarios of *** property summarizes protocol relationships within each protocol group or between two specific protocol groups.A merit of protocol grouping together with classification of protocol relationship is also *** effort of this paper pushes the protocol engineering to go ahead.

关键词： protocol relationship protocol grouping softswitch information flow trail