http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
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.
Antioxidative and Hepatoprotective Effects of Magnolol on Acetaminophen-induced Liver Damage in Rats
Yung-Hsiang Chen,Feng-Yen Lin,Po-Len Liu,Yi-Tsau Huang,Jen-Hwey Chiu,Yi-Chun Chang,Kee-Ming Man,Chuang-Ye Hong,Yen-Yi Ho,Ming-Tsung Lai 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.2
Acute liver failure (ALF), an often fatal condition characterized by massive hepatocyte necrosis, is frequently caused by drug poisoning, particularly with acetaminophen (N-acetyl-p-aminophenol/APAP). Hepatocyte necrosis is consecutive to glutathione (GSH) depletion and mitochondrial damage caused by reactive oxygen species (ROS) overproduction. Magnolol, one major phenolic constituent of Magnolia officinalis, have been known to exhibit potent antioxidative activity. In this study, the anti-hepatotoxic activity of magnolol on APAP-induced toxicity in the Sprague-Dawley rat liver was examined. After evaluating the changes of several biochemical parameters in serum, the levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH) were elevated by APAP (500 mg/kg) intraperitoneal administration (8 and 24 h) and reduced by treatment with magnolol (0.5 h after APAP administration; 0.01, 0.1, and 1 μg/kg). Histological changes around the hepatic central vein, lipid peroxidation (thiobarbituric acid-reactive substance/TBARS), and GSH depletion in liver tissue induced by APAP were also recovered by magnolol treatment. The data show that oxidative stress followed by lipid peroxidation may play a very important role in the pathogenesis of APAP-induced hepatic injury; treatment with lipid-soluble antioxidant, magnolol, exerts anti-hepatotoxic activity. Our study points out the potential interest of magnolol in the treatment of toxic ALF.