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No Blind Spot: Network Coverage Enhancement Through Joint Cooperation and Frequency Reuse
Yi Zhong,Pengcheng Qiao,Wenyi Zhang,Fu-chun Zheng 한국통신학회 2016 Journal of communications and networks Vol.18 No.5
Both coordinated multi-point transmission and frequencyreuse are effective approaches to mitigate inter-cell interferenceand improve network coverage. The motivation of thiswork is to explore the manner to effectively utilize the spectrum resourceby reasonably combining cooperation and frequency reuse. The Mat´ern cluster process, which is appropriate to model networkswith hot spots, is used to model the spatial distributionof base stations. Two cooperative mechanisms, coherent and noncoherentjoint transmission (JT), are analyzed and compared. Wealso evaluate the effect of multiple antennas and imperfect channelstate information. The simulation reveals that the proposed approachto combine cooperation and frequency reuse is effective toimprove the network coverage for users located at both the centerand the boundary of the cooperative region.
No Blind Spot: Network Coverage Enhancement Through Joint Cooperation and Frequency Reuse
Zhong, Yi,Qiao, Pengcheng,Zhang, Wenyi,Zheng, Fu-chun The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5
Both coordinated multi-point transmission and frequency reuse are effective approaches to mitigate inter-cell interference and improve network coverage. The motivation of this work is to explore the manner to effectively utilize the spectrum resource by reasonably combining cooperation and frequency reuse. The $Mat{\acute{e}}rn$ cluster process, which is appropriate to model networks with hot spots, is used to model the spatial distribution of base stations. Two cooperative mechanisms, coherent and non-coherent joint transmission (JT), are analyzed and compared. We also evaluate the effect of multiple antennas and imperfect channel state information. The simulation reveals that the proposed approach to combine cooperation and frequency reuse is effective to improve the network coverage for users located at both the center and the boundary of the cooperative region.
Research on Query Gain Routing Algorithms and Load Balancing Mechanism in Wireless Sensor Networks
Jiang Hui-Lin,Qiao Li,Fu Yi-De 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
It is necessary to reduce the consumption of network node energy and the network load for solving the query design for routing algorithm in wireless sensor network, thus this article presents query gain routing algorithms and load balancing mechanism. This algorithm selects routing node by querying the routing information of gain matrix according to the successful record of historical query. The load balancing mechanism queries the energy information, which records node in the routing process and transfers load to balance the energy consumption of each node in the query path. This algorithm is able to effectively aware routing load to reduce the network energy consumption and avoid the data collision. The experimental result shows that compared with other query routing strategy, the query gain routing can increase the success rate of query under the condition of reducing the node energy consumption, but the load balancing mechanism can reduce the energy consumption of query gain routing further and prolong the network life cycle more effectively.
Colorectal Cancer Concealment Predicts a Poor Survival: A Retrospective Study
Li, Xiao-Pan,Xie, Zhen-Yu,Fu, Yi-Fei,Yang, Chen,Hao, Li-Peng,Yang, Li-Ming,Zhang, Mei-Yu,Li, Xiao-Li,Feng, Li-Li,Yan, Bei,Sun, Qiao Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.7
Objectives: Understanding the situation of cancer awareness which doctors give to patients might lead to prognostic prediction in cases of of colorectal cancer (CRC). Methods: Subsets of 10,779 CRC patients were used to screen the risk factors from the Cancer Registry in Pudong New Area in cancer awareness, age, TNM stage, and gender. Survival of the patients was calculated by the Kaplan-Meier method and assessed by Cox regression analysis. The views of cancer awareness in doctors and patients were surveyed by telephone or household. Results: After a median observation time of 1,616 days (ranging from 0 to 4,083 days) of 10,779 available patients, 2,596 of the 4,561 patients with cancer awareness survived, whereas 2,258 of the 5,469 patients without cancer awareness and 406 of the 749 patients without information on cancer awareness died of the disease. All-cause and cancer-specific survival were poorer for the patients without cancer awareness than those with (P < 0.001 for each, log-rank test). Cox multivariate regression analysis showed that cancer concealment cases had significantly lower cancer-specific survival (hazard ratio (HR) = 1.299; 95 % confidence interval (CI): 1.200-1.407)and all-cause survival (HR = 1.324; 95 % CI: 1.227-1.428). Furthermore, attitudes of cancer awareness between doctors and patients were significantly different (P < 0.001). Conclusion: Cancer concealment, not only late-stage tumor and age, is associated with a poor survival of CRC patients.
( Xin Ran Li ),( Hui Xu ),( Jie Xie ),( Qiao Fu Yi ),( Wei Li ),( Dai Rong Qiao ),( Yi Cao ),( Yu Cao ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.4
In order to improve the expression of heat-resistant xylanase XYNB from Aspergillus niger SCTCC 400264, XynB has been cloned into Pichia pastoris secretary vector pPIC9K. The XynB production of recombinant P. pastoris was four times that of E. coli, and the Vmax and specific activity of XynB reached 2,547.7 umol/mg and 4,757 U/mg, respectively. XynB still had 74% residual enzyme activity after 30 min of heat treatment at 80°C. From the van der Waals force analysis of XYNB (ACN89393 and AAS67299), there is one more oxygen radical in AAS67299 in their catalytic site, indicating that the local cavity is much more free, and it is more optimal for substrate binding, affinity reaction, and proton transfer, etc, and e ventually i ncreasing enzyme activity. The H-bonds analysis of XYNB indicated that there are two more H-bonds in the 33rd Ser of XYNB (AAS67299) than in the 33rd Ala(ACN89393 ), and two H-bonds between Ser70 and Asp67.