An Energy-efficient Transmission Scheme for Wireless Sensor Network with DSC and virtual MIMO

Guoqiang Zheng,Fangge Nie,Bing Li,Huahong Ma,Jishun Li,Yujun Xue,Peipei Li 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10

Energy efficiency is one of the primary performance parametersin wireless sensor network (WSN). The data collected by neighboring nodesin the high density WSN tend to have a high correlation which isdirectly transmitted to the sink node (DGN) will seriously reduce the energy efficiency of wireless sensor networks.For improving the energy efficiency of high node density WSN, We introduce distributed source coding (DSC) which can compress the high correlation source data into WSNbased on virtual MIMO. In the simulationresults indicate thatDSC can effectively reduce the energy consumption in data transmission and improve the energy efficiencyof the whole WSN.

A Large-scale Multi-track Mobile Data Collection Mechanism for Wireless Sensor Networks

( Guoqiang Zheng ),( Lei Fu ),( Jishun Li ),( Ming Li ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.3

Recent researches reveal that great benefit can be achieved for data gathering in wireless sensor networks(WSNs) by employing mobile data collectors. In order to balance the energy consumption at sensor nodes and prolong the network lifetime, a multi-track large-scale mobile data collection mechanism (MTDCM) is proposed in this paper. MTDCM is composed of two phases: the Energy-balance Phase and the Data Collection Phase. In this mechanism, the energy-balance trajectories, the sleep-wakeup strategy and the data collection algorithm are determined. Theoretical analysis and performance simulations indicate that MTDCM is an energy efficient mechanism. It has prominent features on balancing the energy consumption and prolonging the network lifetime.

Hole Diameter Deviation Control Method for Robotic Hole-Making System Based on Presser Foot Action

Xiaohu Zheng,Guanyao Zhang,Chao Zhou,Guoqiang Guo 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.2

Robotic hole-making systems are widely used in aerospace, automotive and other fields, mainly for diverse and structurally complex parts processing tasks. However, the industrial robot automatic hole-making system is an open-chain multi-bar tandem mechanism, which is prone to quality problems such as unstable cutting process, large hole diameter deviation and hole wall surface defects when performing tasks such as hole-making. This article constructs a stiffness enhancement model for the axial and horizontal directions of the robot presser foot based on the robot end stiffness enhancement method and analyzes the impact of pressure changes on hole-making quality under the action of the presser foot. Through experimental data analysis, the aperture deviation decreased by 32.91% compared to before the pressure foot and the average height of outlet burrs decreased by 85.3%, verifying the feasibility of the method.

Clock Self-Synchronization Protocol based on Distributed Diffusion for Wireless Sensor Networks

Min Li,Guoqiang Zheng,Jishun Li 보안공학연구지원센터 2014 International Journal of Future Generation Communi Vol.7 No.5

A Virtual MIMO Communication Strategy Based on Cooperative Groups for Wireless Sensor Networks

Bing Li,Guoqiang Zheng,Na Li,Jishun Li 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.3

As we all know, virtual MIMO technology is an efficient way for energy saving in wireless sensor networks (WSNs). The present virtual MIMO communication strategies in WSNs depend on cluster heads collecting and forwarding source data, which causes big energy consumption. Aiming at this problem, we propose a new virtual-MIMO communication strategy based on cooperative group (CG) in this paper, called Group Collaboration MIMO (GCMIMO). GCMIMO clusters the WSN into several clusters. Each cluster is managed by two cluster heads, master cluster head (MCH) and vice cluster head (VCH). MCH divides the source nodes into several cooperative groups, every two nodes as a group. A CG can constitute a virtual dual-antenna transmitter for sending source data of both nodes directly. VCH and MCH are always seen as a CG, called master cooperative group (MCG), which can receive and forward the data from CGs of other clusters. Unlike the existing virtual MIMO communication strategy, GCMIMO doesn’t require the cluster heads collecting the data of the source nodes, which can reduce the times of source data transmission and improve the energy efficiency. In the simulation, we analyze the energy consumption in each communication phase of GCMIMO. The results indicate that GCMIMO can effectively decrease the energy consumption in data transmission and improve energy efficiency.

A MAC Protocol Based on Broadcast Messages for Wireless Sensor Network

Bingwu Kang,Guoqiang Zheng,Fangge Nie,Huahong Ma,Jishun Li,Yujun Xue,Peipei Li 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11

Competitive MAC protocols become a good choice for Wireless Sensor Network because of their have good dynamic adaptability and so on. However, in general, there is a serious problem of data collision in competitive protocols, so a low collision MAC protocol based on broadcast messages is proposed in this paper, SA-MAC (Self-adaption Advertisement MAC). It uses broadcast messages to make the related nodes working in a scheduled time slot, while the unrelated nodes turning to sleep in the time slot, thus reducing the probability of data collision. Additionally, it designs the corresponding adaptive contention window mechanism and fast transmission mechanism according to the usage ratio of data buffer, so the network performance is further improved. The simulation results show that, compared with S-MAC and ADV-MAC, SA-MAC can reduce the energy consumption and delay while improving the packet delivery ratio. Moreover, it maintains a good network performance whether in the single-hop or multi-hop network environment.

중국에서의 한국학 연구 현황과 전망

張國?(Zhang Guoqiang),鄭傑(Zheng Jie) 서울대학교 동아문화연구소 2014 東亞文化 Vol.52 No.-

With the continuous progress on China-Korea communication, Korean Studies in China is experiencing a leaping development. This essay will focus on two recent stages marked by the establishment of China-Korea Diplomatic Relations. The Chinese Open-door policy implemented around the 1980’s has brought great impact on Korean Studies in China. Ever since then the studies were distinguished by the year 1980 and divided into two stages as 1949-1980 and 1980-1992 before the Diplomatic Relations were set up between the two governments. The two stages after are divided into the 1990’s and 2000-present. This essay is written to explore the history of Korean Studies in China, summarizing the features at each stage and discussing the study prospects based on a chronological research on the motivation, content, institution and major achievements of Chinese scholars. In addition to the continuous studies upon the newly emerged economic situations in Korea with the regional cooperation support due to the complimentary advantage of the two countries, there will be more weight put on Korean politics, diplomatics, securities studies. Despite of the existing historical disputation issues, necessary reviews on relevant aspects will be pushed forward to further contribute to mutual understandings.It is also predictable that Humanistic culture will be a major focus giving credits to the ascending numbers and research levels of younger generation scholars of Korean Studies in China.

FARS: A Fairness-aware Routing Strategy for Mobile Opportunistic Networks

( Huahong Ma ),( Honghai Wu ),( Guoqiang Zheng ),( Baofeng Ji ),( Jishun Li ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.5

Mobile opportunistic network is a kind of ad hoc networks, which implements the multi-hop routing communication with the help of contact opportunity brought about by the mobility of the nodes. It always uses opportunistic data transmission mode based on store-carry-forward to solve intermittent connect problem of link. Although many routing schemes have been proposed, most of them adopt the greedy transmission mode to pursue a higher delivery efficient, which result in unfairness extremely among nodes. While, this issue has not been paid enough attention up to now. In this paper, we analyzed the main factors that reflect fairness among nodes, modeled routing selection as a multiple attribute decision making problem, and proposed our Fairness-aware Routing Strategy, named FARS. To evaluate the performance of our FARS, extensive simulations and analysis have been done based on a real-life dataset and a synthetic dataset, respectively. The results show that, compared with other existing protocols, our FARS can greatly improve the fairness of the nodes when ensuring the overall delivery performance of the network.

Removal of Feedback Inhibition of Corynebacterium glutamicum Phosphoenolpyruvate Carboxylase by Addition of a Short Terminal Peptide

Deyu Xu,Jing Zhao,Guoqiang Cao,Jinyu Wang,Qinggang Li,Ping Zheng,Shuxin Zhao,Jibin Sun 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1

Phosphoenolpyruvate carboxylase (PEPC) catalyzes the carboxylation of phosphoenolpyruvate (PEP) in the presence of bicarbonate to form oxaloacetate (OAA), and it plays an important role in high-efficient production of OAA-derived metabolites such as lysine, glutamate and succinate. However, PEPCs often suffered from serious feedback inhibition by various metabolic effectors like aspartate. Here, the feedback inhibition of PEPC from Corynebacterium glutamicum was removed by adding a short terminal peptide like His-tag. The effect of His-tag location on the structure and important properties such as activity, thermostability and feedback inhibition of PEPC has been investigated. The purified untagged PEPC, Nterminal His-tagged PEPC (PEPC-N-His) and C-terminal His-tagged PEPC (PEPC-C-His) were characterized. PEPCN- His (439.71/sec/mM) showed a 1.26 and 186-fold higher catalytic efficiency than untagged PEPC (348.59/sec/mM) and PEPC-C-His (2.36/sec/mM), respectively. Both PEPCN- His and untagged PEPC were significantly inhibited by aspartate at the concentrations above 4 mM (residual activities < 10%), while PEPC-C-His was almost desensitized to aspartate within 10 mM (around 90% of residual activity). Structural analysis showed that the extension of C-terminus may cause steric hindrance for aspartate binding with enzymes, leading to the deregulation of feedback inhibition of PEPC-C-His. This study provides a deeper understanding of the effect of terminal fragments on the structure and function of PEPCs, and helps to engineer the feedback inhibition of PEPCs and structurally similar enzymes.

Perovskite-type LaFe1− xMnxO3 (x=0, 0.3, 0.5, 0.7, 1.0) oxygen carriers for chemical-looping steam methane reforming: Oxidation activity and resistance to carbon formation

Kun Zhao,Fang He,Zhen Huang,Guoqiang Wei,Anqing Zheng,Haibin Li,Zengli Zhao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6

The effects of Mn substitution of LaMnxFe1−xO3 (x=0, 0.3, 0.5, 0.7, 1.0) on the oxidation activity and resistance to carbon formation for chemical-looping steam methane reforming (CL-SMR) were investigated. The desired crystalline perovskite phases were formed by transferring from the orthorhombic structure of LaFeO3 to rhombohedral lattice of LaMnO3 as the degree of Mn-doping increased. Manganese ions have a mixed state of Mn3+ and Mn4+ in the LaFe1−xMnxO3, meanwhile inducing the states of highly mixed character of Fe2+, Fe3+ and Fe4+ in iron ions. Substitution of Mn for Fe with proper value not only increases the lattice oxygen, which is conducive to the partial oxidation of CH4 to produce syngas, but also enhances the lattice oxygen mobility from the bulk to the surface of the oxygen carrier particles. Judging from the points of the redox reactivity, resistance to carbon formation and hydrogen generation capacity, the optimal range of the degree of Mn substitution is x=0.3-0.5.