Depei Qian

POWER: Planning and Deployment Platform for Wireless Sensor Networks

Impeded by the bottleneck of the information collection in the information chain, researchers are more and more interested in the development of wireless sensor networks; the applications of wireless sensor networks are growing too. But less attention are paid to wireless sensor networks planning. To resolve deployment challenges, reduce the deployment risk, we propose to build the planning and deployment platform for wireless sensor networks. POWER is a software environment for planning and deploying wireless sensor networks applications into actual environment. POWER has three main parts, network deployment, simulation, and performance evaluation and optimization. Simulation is the foundation of the POWER. Lifetime is the most important performance evaluation metrics. The target of the POWER is to supply an integrated and optimal deployment solution for an actual application

MidCASE : A Service Oriented Middleware Enabling Context Awareness for Smart Environment

In order to screen heterogeneity of sensor hardware and support rapid development of applications in context-awareness, the idea of middleware is widely adopted. In this paper, the middleware is proposed to support the application development of context- awareness under the new-type networks environment represented by wireless sensor networks. It applies the updated service-oriented and light-weight structure with excellent expansibility and efficiency in the running process. Additionally, the architecture of middleware mainly contains five layers and two cross- layer modules: hardware abstract, service registry, context model, reasoning and application presentation layers; energy management module and security module. During the process of context-awareness, the new method of awareness synchronization is designed to ensure the sensitivity to context switch. At the end of the paper, a healthcare scenario is used to validate the design methodology and demonstrate the supporting function of middleware.

Service Forest: Enabling Dynamic Service Composition in Mobile Ad Hoc Networks

In mobile ad hoc networks, participant devices need to cooperate with each other to overcome the individual resource constraint. Dynamic service composition is a promising solution for this problem. This paper proposes a novel approach aiming at enabling dynamic service composition in mobile ad hoc networks. Our approach is built on a service overlay, called service forest, which serves as an efficient virtual infrastructure while flexible enough to be adapted to the constantly changing of mobile ad hoc networks. Experiment results shows that our approach performs better than existing solutions.

A Novel Distributed Wireless VoIP Server Based on SIP

It is the requirement of the next generation communication systems that devices should provide all existing and future communication services in integral way. After the implementation of 3G technology, smart devices now support text, voice and video communication all in on device. With Wi-Fi technology and low cost Wi-Fi devices available in the market, users can enjoy even free communication services with any one around the world. If all these technologies are brought together, the result would be a large Distribute Wireless multimedia Network. This research work proposes such a distributed wireless VoIP Server infrastructure based on SIP Protocols. The proposed architecture is simple, manageable, stable, and extendable. The prototype test bed is an Infrastructure of distributed wireless VoIP SIP server, which provides text, voice and video communication to both wired and wireless devices. One of the main characteristic of this model is roaming and mobility. User authentication is centralized, and SIP server uses remote centralized AAA server for user authentication. Thus mobile users dont need to worry about roaming and changing the Server. The whole architecture is modular, and the reason for isolating the core modules from the extended modules is flexibility and extendibility.

Supplier categorization with K -means type subspace clustering

Many large enterprises work with thousands of suppliers to provide raw materials, product components and final products. Supplier relationship management (SRM) is a business strategy to reduce logistic costs and improve business performance and competitiveness. Effective categorization of suppliers is an important step in supplier relationship management. In this paper, we present a data-driven method to categorize suppliers from the suppliers’ business behaviors that are derived from a large number of business transactions between suppliers and the buyer. A supplier business behavior is described as the set of product items it has provided in a given time period, a mount of each item in each order, the frequencies of orders, as well as other attributes such as product quality, product arrival time, etc. Categorization of suppliers based on business behaviors is a problem of clustering high dimensional data. We used the k-means type subspace clustering algorithm FW-KMeans to solve this high dimensional, sparse data clustering problem. We have applied this algorithm to a real data set from a food retail company to categorize over 1000 suppliers based on 11 months transaction data. Our results have produced better groupings of suppliers which can enhance the company’s SRM.

Research on planning and deployment platform for wireless sensor networks

With the actual applications of the wireless sensor networks growing, the challenges of the actual deployment get more and more. To improve deployment efficiency, reduce the deployment cost and evaluate the deployment risk, a planning and deployment platform for wireless sensor networks has been built. In this paper, the workflow of the planning and deployment platform for wireless sensor networks and its implementation framework are emphasized. The implementation framework, which is based on J-Sim simulator, provides the implementation details of the platform. An integrated workflow for the platform is illuminated to comprehend the framework clearly.

Cross-Domain Middlewares Interoperability for Distributed Aircraft Design Optimization

The Bridge project is an EU FP6 project funded by the European commission to support the EU-China joint effort on secure and distributed cooperation between European and Chinese industrial communities such as the distributed aircraft design optimization etc. The interoperability between SIMDAT GRIA and CNGrid GOS, which enables a joint grid platform between SIMDAT and CNGRID infrastructures, is fundamental to achieve this goal. This paper presents the interoperability solution adopted by the bridge project, including job management, data sharing, and authentication & authorization. A prototype of distributed aircraft design optimization based on the interoperability between GRIA and GOS has been implemented, which can effectively aggregate and integrate different analysis services that are provided by different geographical distributed partners. The strategies adopted in implementing the prototype are discussed and preliminary results are presented.

A Framework for End-to-End QoS Context Transfer in Mobile IPv6

Providing Quality-of-Service (QoS) guarantees and mobility support for Internet devices has become a hot research topic in the Next Generation Internet research, since mobile computing is getting widespread. Context transfers allow better node mobility support, and avoid re-initiation of signaling to and from a Mobile Node (MN). However, Context Transfer Protocol (CTP) [1] proposed by IETF can not meet the need of end-to-end QoS mechanisms because contexts are only transferred between Access Routers (ARs). This paper presents a framework for end-to-end QoS context transfer based on the architecture of F-HMIPv6, which may provide an end-to-end QoS context transfer for real-time applications, therefore they can get promptly the same forwarding process, minimize the handover service disruption, and avoid initiating the end-to-end QoS signaling from scratch after an MN performs handovers. The Context Transfer Data message containing the QoS context information, a hop-by-hop extension IPv6 option header, is sent from the previous access router (PAR) to the next access router (NAR) via the Mobility Anchor Point (MAP) where old path and new path meet each other. The QoS entities in the nodes between MAP and NAR will be required to check the QoS context information and reserve appropriate resources for MN’s sessions and update the new path data in the QoS entities. After successful context transfers, the resources reserved for MN’s sessions will be released on the old path. Our scheme may also reduce the signaling overhead and handover latencies by adopting the F-HMIPv6 [2] architecture.

Partition-Based Hardware Transactional Memory for Many-Core Processors

Transactional memory is an appealing technology which frees programmer from lock-based programming. However, most of current hardware transactional memory systems are proposed for multi-core processors, and may face some challenges with the increasing of processor cores in many-core systems, such as inefficient utilization of transactional buffers, unsolved problem of transactional buffer overflow, etc. This paper proposes PM_TM, a hardware transactional memory for many-core processors. The system turns transactional buffers that are traditionally private to processor cores into shared by moving them from L1-level to L2-level, and uses partition mechanism to provide logically independent and dynamically expandable transactional buffers to transactional threads. As the result, the solution can utilize transactional buffers more efficient and moderate the problem of transactional buffer overflow. The system is simulated and evaluated using gems and simics simulator with STAMP benchmarks. Evaluation results show that the system achieves better performance and scalability than traditional solutions in many-core processors.

Energy Efficient Event Detection and Dissemination Scheme for Clustered Wireless Sensor Networks

An energy-efficient event detection and dissemination (EEDD) scheme for event-driven wireless sensor networks applications is introduced. Based on clustering-based architecture, EEDD includes sensor and aggregation management, sleep and wakeup scheduling, and a customized multi-channel MAC/routing protocol with power control. Bit map based MAC approach is adapted to use not only in intra-cluster communication, but also in inter-cluster communication. Lifetime is prolonged by integrated design of role-based sleep and medium access, while urgent events can be transmitted immediately.