A Tier-Based Duty-Cycling Scheme for Forest Monitoring

Zhang, Fuquan,Gao, Deming,Joe, In-Whee Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5

Wireless sensor networks for forest monitoring are typically deployed in fields in which manual intervention cannot be easily accessed. An interesting approach to extending the lifetime of sensor nodes is the use of energy harvested from the environment. Design constraints are application-dependent and based on the monitored environment in which the energy harvesting takes place. To reduce energy consumption, we designed a power management scheme that combines dynamic duty cycle scheduling at the network layer to plan node duty time. The dynamic duty cycle scheduling is realized based on a tier structure in which the network is concentrically organized around the sink node. In addition, the multi-paths preserved in the tier structure can be used to deliver residual packets when a path failure occurs. Experimental results show that the proposed method has a better performance.

An Efficient Multiple-Copy Routing in Intermittently Connected Mobile Networks

Fuquan Zhang,Inwhee Joe,Demin Gao,Yunfei Liu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5

PRoPHET (probability routing protocol using history of encounters and transitivity) reduces the invalid copy of message, so that effectively reduce the network overhead and the traffic load in the network. However, the calculation of probability in Prophet does not consider the network conditions. In this paper, we improve the performance of PRoPHET protocol by taking into account connection status to calculate nodes’ encountering probability. The performance of the proposed protocol was analyzed in terms of delivery probability, average delay, and overhead ratio. Numerical results show that the proposed protocol can improve the performance to some extend.

A Tier-Based Duty-Cycling Scheme for Forest Monitoring

Fuquan Zhang,Deming Gao,조인휘 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5

Wireless sensor networks for forest monitoring are typically deployed in fields in which manual interventioncannot be easily accessed. An interesting approach to extending the lifetime of sensor nodes is the use ofenergy harvested from the environment. Design constraints are application-dependent and based on themonitored environment in which the energy harvesting takes place. To reduce energy consumption, wedesigned a power management scheme that combines dynamic duty cycle scheduling at the network layer toplan node duty time. The dynamic duty cycle scheduling is realized based on a tier structure in which thenetwork is concentrically organized around the sink node. In addition, the multi-paths preserved in the tierstructure can be used to deliver residual packets when a path failure occurs. Experimental results show thatthe proposed method has a better performance.

Measurement and Application of Link Reliability for Wireless Mobile Networks

Fuquan Zhang,Inwhee Joe,Demin Gao,Yunfei Liu 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.6

Radio channel characteristics of mobile nodes are quite different compared with the traditional stationary base station to mobile radio channel. Wireless link reliability estimation is necessary for self-organization of wireless mobile multihop networks. In this paper, we measure narrowband path loss measurements in a typical mobile-to-mobile radio environment. For application, we proposed a method to incorporate link reliability into path reliability evaluation and selection for multipath routing in wireless mobile networks. Simulations show that the proposed method has better performance.

A Way of Candidate Set Selection for Epidemic Routing in Delay Tolerate Networks

Fuquan Zhang,Kaiqi Chen,Inwhee Joe,Demin Gao,Yunfei Liu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10

The radio propagation effect of fading or shadowing between mobile nodes has not been well considered in contact rate. One way to incorporate interference into contact rate is multiplied by probability that the infected node copies the message to the susceptible node during a contact in epidemic routing. In this paper, we develop a model to incorporate the wireless link reliability into contact rate. For application, we proposed a scheme for epidemical delay tolerate network with considering the effects based on the model. Simulation shows that proposed scheme has better performance.

Description of Microbacterium luteum sp. nov., Microbacterium cremeum sp. nov., and Microbacterium atlanticum sp. nov., three novel C50 carotenoid producing bacteria

Xie Fuquan,Niu Siwen,Lin Xihuang,Pei Shengxiang,Jiang Li,Tian Yun,Zhang Gaiyun 한국미생물학회 2021 The journal of microbiology Vol.59 No.10

We have identified three Microbacterium strains, A18JL200T, NY27T, and WY121T, that produce C50 carotenoids. Taxonomy shows they represent three novel species. These strains shared < 98.5% 16S rRNA gene sequence identity with each other and were closely related to Microbacterium aquimaris JCM 15625T, Microbacterium yannicii JCM 18959T, Microbacterium ureisolvens CFH S00084T, and Microbacterium hibisci CCTCC AB 2016180T. Digital DNA-DNA hybridization (dDDH) values and average nucleotide identity (ANI) showed differences among the three strains and from their closest relatives, with values ranging from 20.4% to 34.6% and 75.5% to 87.6%, respectively. These values are below the threshold for species discrimination. Both morphology and physiology also differed from those of phylogenetically related Microbacterium species, supporting that they are indeed novel species. These strains produce C50 carotenoids (mainly decaprenoxanthin). Among the three novel species, A18JL200T had the highest total yield in carotenoids (6.1 mg/L or 1.2 mg/g dry cell weight). Unusual dual isoprenoid biosynthetic pathways (methylerythritol phosphate and mevalonate pathways) were annotated for strain A18JL200T. In summary, we found strains of the genus Microbacterium that are potential producers of C50 carotenoids, but their genome has to be investigated further.

A Survey on Organization and Positioning of Nodes in Wireless Sensor Network

Xinyi Tan,Fuquan Zhang,MengMeng Shi,Demin Gao,Yunfei Liu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11

Wireless sensor network has a rapid growth in both science research and commercial development as well as been widely used in a variety of realms. Facing different kinds of challenging issues of WSNs, the deployment of nodes stands out for it has a critical influence on area or target coverage, network connectivity, network lifetime, etc. This paper explores classifications of node and deployment strategies from different angles, weighing their pros and cons and analyzing its impacts on the performance of a WSN.

Deep Image Annotation and Classification by Fusing Multi-Modal Semantic Topics

( YongHeng Chen ),( Fuquan Zhang ),( WanLi Zuo ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.1

Due to the semantic gap problem across different modalities, automatically retrieval from multimedia information still faces a main challenge. It is desirable to provide an effective joint model to bridge the gap and organize the relationships between them. In this work, we develop a deep image annotation and classification by fusing multi-modal semantic topics (DAC_mmst) model, which has the capacity for finding visual and non-visual topics by jointly modeling the image and loosely related text for deep image annotation while simultaneously learning and predicting the class label. More specifically, DAC_mmst depends on a non-parametric Bayesian model for estimating the best number of visual topics that can perfectly explain the image. To evaluate the effectiveness of our proposed algorithm, we collect a real-world dataset to conduct various experiments. The experimental results show our proposed DAC_mmst performs favorably in perplexity, image annotation and classification accuracy, comparing to several state-of-the-art methods.

Determination of Maximum Penetration Depth of Suction Caissons in Sand

Wu Yuqi,LI Dayong,Zhang Yukun,Chen Fuquan 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.8

The suction caisson is a large top-closed cylindrical steel structure in diameter, short in length and much thinner in skirt wallthickness. The total resistance of the suction caisson during installation consists of the tip resistance and the skirt wall friction. However, since the thickness of the skirt wall is very small, the skirt wall friction may produce additional vertical stress and shearstress in soil at the skirt tip level, and this additional vertical stress and shear stress will contribute to the increase in the skirt tipresistance. At the same time, seepage induced by suction also causes the tip resistance to reduce significantly. A modified slip-linefield is proposed in this study estimating the tip resistance in terms of the slip-line theory. The expression obtaining the minimumsuction to install the suction caisson is also proposed in terms of the force equilibrium. In addition, the critical suction is determinedbased on the mechanism of sand piping. Thus, the maximum penetration depth of the suction caisson can be reached when the criticalsuction equals the minimum suction. Results from calculations of the minimum suction and the maximum penetration depth havebeen proved to be in a good agreement with the measured data.

Epidemiology and resistance features of Acinetobacter baumannii isolates from the ward environment and patients in the burn ICU of a Chinese hospital

Yali Gong,Xiaodong Shen,Guangtao Huang,Cheng Zhang,Xiaoqiang Luo,Supeng Yin,Jing Wang,Fuquan Hu,Yizhi Peng,Ming Li 한국미생물학회 2016 The journal of microbiology Vol.54 No.8

Acinetobacter baumannii is an important opportunistic pathogen that causes severe nosocomial infections, especially in intensive care units (ICUs). Over the past decades, an everincreasing number of hospital outbreaks caused by A. baumannii have been reported worldwide. However, little attention has been directed toward the relationship between A. baumannii isolates from the ward environment and patients in the burn ICU. In this study, 88 A. baumannii isolates (26 from the ward environment and 62 from patients) were collected from the burn ICU of the Southwest Hospital in Chongqing, China, from July through December 2013. Antimicrobial susceptibility testing results showed that drug resistance was more severe in isolates from patients than from the ward environment, with all of the patient isolates being fully resistant to 10 out of 19 antimicrobials tested. Isolations from both the ward environment and patients possessed the β-lactamase genes blaOXA-51, blaOXA-23, blaAmpC, blaVIM, and blaPER. Using pulsed-field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST), these isolates could be clustered into 4 major PFGE types and 4 main sequence types (ST368, ST369, ST195, and ST191) among which, ST368 was the dominant genotype. Epidemiologic and molecular typing data also revealed that a small-scale outbreak of A. baumannii infection was underway in the burn ICU of our hospital during the sampling period. These results suggest that dissemination of β-lactamase genes in the burn ICU might be closely associated with the high-level resistance of A. baumannii, and the ICU environment places these patients at a high risk for nosocomial infection. Cross-contamination should be an important concern in clinical activities to reduce hospital acquired infections caused by A. baumannii.