http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Wang Huiqiang (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
A Trust Game Model and Algorithm for Cooperative Spectrum Sensing in Cognitive Radio Networks
Wang Zhendong,Wang Huiqiang,Zhu Qiang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.3
The existence of malicious secondary users will bring damage to the performance of cooperative spectrum sensing and spectrum access in cognitive radio networks, so effectively curbing malicious behavior of secondary users become the key to success for cooperative spectrum sensing mechanism. Inspired by economics of repeated game theory, a trust game model and algorithm of distributed cooperative spectrum sensing oriented to malicious secondary users named FRTrust is proposed. In FRTrust, the reputation status is used to describe the performance of a secondary user in cooperative spectrum sensing process. It encourages secondary users to choose positive and honest behavior strategies for greater and long term benefits. Simultaneously, a ‘differentiation’ punishment mechanism is presented to respond malicious behaviors of secondary users. By this way, the ‘first offender’ secondary users and the ‘recidivist' secondary users can be distinguished effectively. If a secondary user departs from the normal times in its life period, it will be punished superimposed. Simulation results show that the FRTrust algorithm can encourage secondary users to participate in spectrum sensing in a cooperative attitude, improve the transaction success ratio of cooperative spectrum sensing, and guarantee the fairness and spectrum access performance for cognitive radio networks.
-
Huiqiang Wu,Xiangmin Wang,Yang Liu,Yu Zhao,Xinyue Wang,Woo-Kyoung Lee,심영기,Il Yoon,Xinming Xu,Jiazhu Li 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.5
In this article, we report the stereoselective Horner?Wadsworth?Emmons reaction of reactive carbonyl-substituted chlorophyll a derivatives with diethyl cyanomethylphosphonate. We found that the formyl or keto group at the chlorin periphery can react stereoselectively with phosphonate carbanions to produce a series of cyanomethylene-substituted chlorins with predominantly E geometry. Considering that no consistent records are available in the literature on the results of the allomerization of methyl pyropheophorbide a, we propose a reliable process for the transformation of this chlorophyll derivative. Our methodology represents a simple and efficient way for the preparation of novel, differently functionalized long-wavelength absorbing chlorins, those can be applied for photodynamic therapy, solar cells, and other relevant purposes.
-
A Trust Management Model for Mobile P2P Networks based on Multiple-Fuzzy Theory
Meijuan JIA,Huiqiang WANG,Guangsheng FENG,Fangfang GUO 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.12
The characteristics of dynamic, heterogeneity and limited resources of peers result in the existence of selfish behavior in MP2P network, which affect the network performance. To improve the performance of MP2P, a trust management model for peer reputation is established based on multiple-fuzzy theory in this paper. Direct trust, indirect trust, residual energy and active degree of peers are used as the fundamental variables and their weights are determined by using fuzzy theory, and then the reputation of peers is calculated. Peers with high reputation are allowed to participate in the communication and peers with low reputation are not allowed. The experimental simulation results show that the model not only effectively improve the malicious peer detection rate and the query hit rate but also reduce the Cx of the network.
-
Expanding Ring Search Energy Analysis and Optimization for Wireless Sensor Networks
Xiuxiu Wen,Huiqiang Wang,Guangsheng Feng,Hongwu Lv,Junyu Lin,Qiang Zhu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9
Expanding Ring Search (ERS) is an advanced flooding technique exploring for targets progressively. It is widely used to locate destinations or information in wireless sensor networks. In this paper, a fundamental problem concerning the best ERS strategy to minimize energy cost in wireless sensor networks is addressed. We propose a model for estimating the average energy cost of ERS strategies, and a model for comparing the energy cost of an ERS strategy with pure flooding. The second model is then used to prove that incremental ERS strategies are inefficient in large-scale wireless sensor networks. Furthermore, we propose an ERS strategy optimization algorithm SSetOpt, which can be applied to both dense wireless sensor networks and sparse ones. The simulation results show that the strategy obtained by SSetOpt can cost 5% less energy than prior works when the network is sparse, say, the average degree is less than 30..
-
HMFS : A Hybrid Message Ferrying Scheme for Clustered Opportunistic Networks
Zhang Yushu,Wang Huiqiang,LV Hongwu,Feng Guangsheng,Zhu Jinmei 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.4
Opportunistic network is an evolution of MANETs to delivery messages in intermittent-ly connected or completely disconnected wireless networks. Message ferrying is an effec-tive routing mode in opportunistic networks. However, the single message ferry routing scheme leads a much higher delay as the increasing of the network scale, comparing with that in small scale opportunistic networks. It has been proved that multiple message fer-ries routing scheme can improve the performance of large scale networks, but the prob-lems of synchronization and coordinate between ferries have a bad effect on the routing efficiency. To solve these problems, a Hybrid Message Ferrying Scheme (HMFS) for clus-tered opportunistic networks is proposed. In HMFS, we divide the communication area into multiple regions based on clustering results and several cross zones containing the regions. A local ferry is deployed in each region to deliver messages in the region, and several global ferries are deployed according to horizontal and vertical zones to commu-nicate among the regions. Moreover, each region has a ferry relay node in it, which is used to orchestrate the local ferry and global ferries. Through the theoretical analysis and simulation results, we can see that HMFS can improve the effect of routing in oppor-tunistic networks in terms of network latency and delivery ratio.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
