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NOP: An Efficient Non-optimization-based Method for RFID Network Topology Design
Po-jen Chuang,Wei-Ting Tsai 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12
For Radio Frequency IDentification (RFID) applications in Internet of Things, proper reader deployment is important because unguarded deployment may cause reader-to-tag or reader-to-reader interferences, incurring huge deployment cost. Current RFID topology designs are optimization-based whose heuristic search for optimal or sub-optimal solutions may take much complexity and whose improper utilization or concurrent consideration on the involved objectives may generate unfavorable results. To pursue more desirable reader deployment for RFID networks, this paper presents an efficient new topology design – NOP. NOP involves a Non-OPtimization practice to avoid the tediously long heuristic search in optimization-based methods and gives proper sequential considerations on involved objectives to avoid improper objective utilization. The conducted experimental evaluation shows that our NOP method can produce better reader deployment by reduced complexity. Specifically, it outperforms optimization-based methods, such as GA, GAA and IGAA, by yielding higher fitness values at less processing time and deployment cost.
IGAA : An Efficient Optimization Technique for RFID Network Topology Design in Internet of Things
Po-Jen Chuang,Wei-Ting Tsai 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
Most RFID applications in the Internet of Things (IoTs) use multiple readers to read the IDs of multiple tags and form the RFID network. In such a network, unguarded reader deployment may generate over-crowded readers, cause interferences and, as a result, increases the deployment cost while degrading tag detection. Seeing that desirable reader deployment is crucial for RFID system performance, this paper introduces an optimization-based IGAA approach which outperforms existing RFID topology designs by turning up more favorable reader deployment and system performance. The new approach employs an advanced multi-objective fitness function and improved genetic annealing algorithms (GAA) to pursue a better RFID topology design. By involving an improved gene-stirring operation to help preserve good genes and locate optimal solutions for reader deployment, it is simple in operation but effective in practice. Experimental evaluation shows that when compared with related approaches, IGAA can yield better solution quality with less search time.
Po-Jen Chuang,Ming-Chun Liu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.1
We present a new routing protocol in this paper to enhance junction-based routing for vehicle-to-vehicle (V2V) vehicular ad-hoc networks (VANETs). Employing effective routing table learning and maintenance, the new protocol is able to accomplish better transmission stability and lower transmission cost. In practice, the mechanism of routing table learning will help a vehicle establish its own static path information by which to locate suitable relay vehicles in a more efficient way, and the practice of routing table maintenance may substantially reduce the probability of finding no suitable relay vehicles, to avoid unnecessary packet discarding. Extended simulation is conducted to evaluate the performance of our new protocol and related routing protocols. The results exhibit that our protocol performs constantly better than others in terms of packet delivery ratios, packet drop ratios and average delay time. It ensures more efficient transmission without additional control overhead in highly mobile V2V VANETs.
An Efficient Video Content Delivery Strategy for Radio Access Network Environments
Po-Jen Chuang,Hang-Li Chen 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
When a radio access network (RAN) environment cannot handle the tremendous mobile data traffic, users may experience degraded or declined services. To help process the large number of user video requests in RANs, a content delivery network (CDN) architecture has been recently introduced, which establishes a number of cache servers outside the source server for users to get the needed data from the nearest cache server. To upgrade the performance of a wireless CDN, this paper presents a new caching strategy based on analytical results of real user video request traces and specific caching considerations for videos with different popularity degrees. The new strategy first caches videos with high popularity to all helpers and then caches those with low popularity to the remaining helper storage to enhance the overall request hits. Performance evaluation exhibits that, when compared with other caching strategies, our new strategy is able to yield better request hits with low complexity and average delay time.
An Internet Based Embedded Network Monitoring System for Renewable Energy Systems
Po-Yen Chen,Se-Kang Ho,Wei-Jen Lee,Chia-Chi Chu,Ching-Tsa Pan 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
In this paper, an internet based embedded network monitoring system is proposed for renewable energy systems. By using a low cost network communication module (RCM 3700) as a web server, one can achieve better network security, lower power consumption, compact size, and easier to use as compared with a PC based one. Also, Java language is chosen for designing a dynamic webpage to graphically display various real time waveforms of the controlled system for multi-user at the same time. As an illustrative example, a small scale wind power generation system equipped with an EZDSP 2812 controller is adopted for demonstration. In addition, an FPGA EC10 is implemented as a bidirectional communication interface for coordinating the asynchronous data transmission modes. Experimental results from the constructed prototype verify that the proposed monitoring system can indeed achieve the desired function.
Elucidation of the mechanisms of optical clearing in collagen tissue with multiphoton imaging.
Hovhannisyan, Vladimir,Hu, Po-Sheng,Chen, Shean-Jen,Kim, Chang-Seok,Dong, Chen-Yuan SPIE--the International Society for Optical Engine 2013 Journal of biomedical optics Vol.18 No.4
<P>Optical clearing (OC) is a promising method to overcome limitations in biomedical depth-resolved optical studies. Mechanisms of OC in purified bovine Achilles tendon, chicken skin, and chicken tendon were studied using time-lapsed, three-dimensional second harmonic generation (SHG) and two-photon fluorescence microscopic imaging. Quantified nonlinear optical measurements allowed temporal separation of two processes in collagen OC with glycerol. The first one is a fast process of tissue dehydration accompanied with collagen shrinkage and the second relatively slow process is glycerol penetration into the interfibrillar space of collagen alongside with CF swelling. The use of 50% glycerol induced less-expressed OC via partial substitution of water molecules with glycerol molecules. We also found that phosphate-buffered saline- and glycerol-treatments were reversible, and fiber morphology and SHG signal intensity were recovered after the removal of immersion agents. It was shown that tissue OC was a dynamic process and elucidation of its physical mechanisms may help choose optimal diagnostic, treatment, and modification regimes for collagen-based as well as other types of biomaterials.</P>