创新的技术应用体验魅力的时尚设计享受科技生活工作和娱乐休闲.docx

1、创新的技术应用体验魅力的时尚设计享受科技生活工作和娱乐休闲A memetic algorithm for optimal dynamic design of wireless sensor networksComputer CommunicationsWe present a memetic algorithm that dynamically optimizes the design of a wireless sensor network towards energy conservation and extension of the life span of the network, t

2、aking into consideration application-specific requirements, communication constraints and energy consumption of operation and communication tasks of the sensors. The memetic algorithm modifies an already successful genetic algorithm design system and manages to improve its performance. The obtained

3、optimal sensor network designs satisfy all application-specific requirements, fulfill the existing connectivity constraints and incorporate energy conservation characteristics stronger than those of the original genetic algorithm system. Energy management is optimized to guarantee maximum life span

4、of the network without lack of the network characteristics that are required by the specific sensing application.Article Outline1. Introduction2. WSN design properties 2.1. WSN modeling2.2. Design parameters 2.2.1. Application specific parameters2.2.2. Connectivity parameters2.2.3. Energy related pa

5、rameters3. Original GA-based algorithm 3.1. Methodology of GA3.2. GA-based dynamic optimal design algorithm4. Memetic algorithm approach 4.1. Local search4.2. Threshold update schemes5. Results 5.1. Network characteristics5.2. Energy conservation6. Discussion7. ConclusionsReferencesRadio resource ma

6、nagement in emerging heterogeneous wireless networksOriginal Research ArticleComputer CommunicationsDeployment of heterogeneous wireless networks is spreading throughout the world as users want to be connected anytime, anywhere, and anyhow. Meanwhile, these users are increasingly interested in multi

7、media applications such as video streaming and Voice over IP (VoIP), which require strict Quality of Service (QoS) support. Provisioning network resources with such constraints is a challenging task. In fact, considering the availability of various access technologies (WiFi, WiMAX, or cellular netwo

8、rks), it is difficult for a network operator to find reliable criteria to select the best network that ensures user satisfaction while maximizing network utilization. Designing an efficient Radio Resource Management (RRM), in this type of environment, is mandatory for solving such problems. In order

9、 to provide a better understanding of RRMs design, this paper presents a detailed investigation of key challenges that constitute an efficient RRM framework. More importantly, an overview with a classification of recent solutions, in terms of decision making, is provided along with the discussion.Ar

10、ticle Outline1. Introduction2. Radio resource management in heterogeneous wireless networks 2.1. Heterogeneous wireless networks2.2. Radio resource management3. Decision mechanisms 3.1. Network-centric approach3.2. User-centric approach.3.3. Collaborative approach4. Important concerns 4.1. QoS suppo

11、rt4.2. Mobility support4.3. Architectural design5. Conclusions and future worksReferencesConstruction defect management using a telematic digital workbenchOriginal Research ArticleAutomation in ConstructionReal-time, rich-media data communication between the construction site and the off-site design

12、 office is becoming one of the important research areas in information technology for construction. This paper presents the concept of a telematic digital workbench, a horizontal tabletop user interface integrating mobile computing and wireless communication to facilitate synchronous construction si

13、te to office collaboration. We demonstrate the capabilities and potentials of this system concept for construction defect management. The on-site crew uses a handheld mobile device to collect defect information and transfers the information to the design office through wireless communication by send

14、ing the information to a database listener. The digital workbench application monitors the database and synchronizes the location of the visual information on the site with the 3D model on the server. Integrated with 3D viewing capability in a CAD system, designers can interact with the combined mod

15、el/site data using a horizontal and vertical screen. A case study compared the telematic digital workbench against paper-based and Pocket PC-based methods for defect management in a controlled laboratory experiment. The case study results show that the telematic digital workbench has the potential t

16、o improve the accuracy of matching site data to digital data and reduce information loss between site and office collaboration.Article Outline1. Introduction2. Background 2.1. Construction defect management2.2. Remote design collaboration and emerging technologies in the construction industry3. Mobi

17、le inspection system on-site 3.1. On-site defect reporting application3.2. Wireless communication4. Telematic digital workbench in design office 4.1. Digital workbench with tangible interaction4.2. Design descriptions of the telematic digital workbench4.3. Synchronous design collaboration using the

18、telematic digital workbench5. Case study 5.1. Experiment5.2. Experiment set-up 5.2.1. Participants5.2.2. Defect tasks5.2.3. Experiment process5.2.4. Three focused processes5.3. Observations 5.3.1. Paper-based method5.3.2. Pocket PC-based method using commercial software5.3.3. Telematic digital workb

19、ench method5.4. Analysis of questionnaire answers 5.4.1. Perception5.4.2. Performance5.4.3. Collaboration5.4.4. Suggestions and comments6. Summary and discussionAcknowledgementsReferencesA reactive role assignment for data routing in event-based wireless sensor networksOriginal Research ArticleCompu

20、ter NetworksIn this work, we show how we can design a routing protocol for wireless sensor networks (WSNs) to support an information-fusion application. Regarding the application, we consider that WSNs apply information fusion techniques to detect events in the sensor field. Particularly, in event-d

21、riven scenarios there might be long intervals of inactivity. However, at a given instant, multiple sensor nodes might detect one or more events, resulting in high traffic. To save energy, the network should be able to remain in a latent state until an event occurs, then the network should organize i

22、tself to properly detect and notify the event. Based on the premise that we have an information-fusion application for event detection, we propose a role assignment algorithm, called Information-Fusion-based Role Assignment (InFRA), to organize the network by assigning roles to nodes only when event

23、s are detected. The InFRA algorithm is a distributed heuristic to the minimal Steiner tree, and it is suitable for networks with severe resource constraints, such as WSNs. Theoretical analysis shows that, in some cases, our algorithm has a O(1)-approximation ratio. Simulation results show that the I

24、nFRA algorithm can use only 70% of the communication resources spent by a reactive version of the Centered-at-Nearest-Source algorithm.Article Outline1. Introduction2. Related work3. Background 3.1. Network and event model3.2. Deployment model3.3. Role assignment model4. Problem statement5. InFRA: I

25、nformation-Fusion-based Role Assignment 5.1. Cluster formation5.2. Route formation5.3. Information fusion 5.3.1. Intra-cluster fusion5.3.2. Inter-cluster fusion5.4. Event detection5.5. Dynamic topologies5.6. Role migration6. Theoretical results 6.1. Approximation ratio6.2. A complexity analysis7. Si

26、mulation results 7.1. Methodology7.2. Reactive vs. proactive role assignment7.3. Communication range7.4. Network scalability7.5. Event scalability7.6. Event size7.7. Density7.8. Event duration8. Final remarksAcknowledgementsReferencesAdaptive CMOS analog circuits for 4G mobile terminalsReview and st

27、ate-of-the-art surveyOriginal Research ArticleMicroelectronics JournalThe fourth-generation (4G) of cellular terminals will integrate the services provided by previous generations second-generation/third-generation (2G/3G) with other applications like global positioning system (GPS), digital video b

28、roadcasting (DVB) and wireless networks, covering metropolitan (IEEE 802.16), local (IEEE 802.11) and personal (IEEE 802.15) areas. This new generation of hand-held wireless devices, also named always-best-connected systems, will require low-power and low-cost multi-standard chips, capable of operat

29、ing over different co-existing communication protocols, signal conditions, battery status, etc. Moreover, the efficient implementation of these chipsets will demand for reconfigurable radio frequency (RF) and mixed-signal circuits that can adapt to the large number of specifications with minimum pow

30、er dissipation at the lowest cost. Nanometer CMOS processes are expected to be the base technologies to develop 4G systems, assuring mass production at low cost through increased integration levels and extensive use of digital signal processing. However, the integration in standard CMOS of increasin

31、gly complex analog/RF parts imposes a number of challenges and trade-offs that make their design critical. These challenges are addressed in this paper through a comprehensive revision of the state-of-the-art on transceiver architectures, building blocks and design trade-offs of reconfigurable and a

32、daptive CMOS RF and mixed-signal circuits for emerging 4G systems.Article Outline1. Introduction2. Review of 4G wireless systems3. Multi-standard wireless transceivers4. Flexible CMOS circuits for the RF-front end 4.1. Low-noise amplifiers4.2. Mixers4.3. Frequency synthesizers and LO-generation circuits5. Flexible CMOS circuits for the mixed-signal BB 5.1. Channel selection5.2. Multi-standard filtering techniques5.3. Reconfigurable