作者机构：
[Li, Yanhui; Lei, Chao; Liu, Bailing] Cent China Normal Univ, Sch Informat Management, Wuhan 430079, Peoples R China.;[Zeng, Bing] S China Univ Technol, Sch Software Engn, Guangzhou 510006, Guangdong, Peoples R China.
通讯机构：
[Zeng, Bing] S;S China Univ Technol, Sch Software Engn, Guangzhou 510006, Guangdong, Peoples R China.
关键词：
automated trust negotiation;mobile commerce;negotiation strategy;Petri net
摘要：
Automated trust negotiation (ATN) offers an attractive means for trust establishments, which establishes mutual trust among strangers wishing to share resources or conduct business, but it comes at the cost of non-trivial computation and communication overheads. The deployment of ATN strategies on a resource-constrained mobile device may lead to user-obstructive latency for operations. In this paper, we propose a trust negotiation strategy called trust target Petri nets negotiation strategy (TPNNS). It highly reduces the negotiation latency in the mobile device compared with other negotiation strategies, since it considers all the alternative responses at each step and chooses the best one. TPNNS supports cycle avoidance and employs skipped TPN which is a new approach presented in this paper. What is more, it is complete and ensures no irrelevant credentials are disclosed during the trust negotiation.
关键词：
ultrafine particles;meteorological parameters;trace gases;industrial city;central China
摘要：
Ultrafine particles with a diameter below 1 μm are strongly linked to traffic and industrial emissions, causing a growing global health concern. In order to reveal the characteristics of ultrafine particles in central China, which makes up the sparse research in industrial cities of a developing country, particle number concentrations (PNC) together with meteorological parameters and concentrations of trace gases were measured over one year inWuhan. The number concentration of ultrafine particles peaked in winter and was the lowest in summer across the entire size range monitored. Further, particles with a diameter smaller than 30 nm increased dramatically in concentration with decreasing diameter. The monthly averaged number concentrations of particles discriminated in three size ranges formed a near- inverse parabolic distribution peaking in January. This trend is supported by a negative correlation between PNC and precipitation, temperature, and mixing layer height, which emphasizes the effect of these meteorological parameters on scouring, convection, and diffusion of particles. However, since wind not only disperses particulate matter but also brings in exogenous particles, wind speed plays an equivocal role in particle number concentrations. The diurnal analysis indicates that hourly measurements of trace gases concentrations could be used as a proxy for dense industrial activities and to reveal some complex chemical reactions. The results of this study offer reasonable estimations of particle impacts and provide references for policymaking of emission control in the industrial cities of developing countries.
期刊：
LIBRARY HI TECH,2016年34(4):685-704 ISSN：0737-8831
通讯作者：
Lu, Quan
作者机构：
[Wang, Dan; Chen, Jing] Cent China Normal Univ, Sch Informat Management, Wuhan, Peoples R China.;[Lu, Quan] Wuhan Univ, Sch Informat Management, Wuhan, Peoples R China.;[Xu, Zeyuan] Univ Calif Los Angeles, Henry Samueli Sch Engn & Appl Sci, Los Angeles, CA USA.
