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Genetic search for optimal personalized location areas for future PCS networks

100%

Varadarajan R. , Zheng J. , Regentova E. E.

2009

tom Vol. 35, no 2

81-88

In Personal Communication Services (PCS) networks, mobile terminals (MT) are communicating frequently using a variety of services. A high-quality framework is needed for tracking consistently MTs in the system and delivering the services timely. Future PCS networks are expected to have smaller cells to address the transmission power concerns and reuse frequencies efficiently. Thus, MTs are expected to signal even more frequently under always update (AU) strategy adopted in current PCS networks, such as GSM . One pathway for solving the problem is the consideration of Location Areas (LA). The location update takes place only when the MT moves off the area. For call delivery the area is paged. Thus, another signaling component is introduced. In this paper, we propose the design of personalized LA's (PLAs) per an individual user. The model we use takes into account the MT's behavior in the network and the system parameters. The problem is known to be NP-complete of a high computational complexity. We provide a proof of the complexity and solve the problem by using the genetic search for finding a sub-optimal solution. It is shown that the cost of location management under the model and the designed search algorithm can be significantly lower than that consumed by AU mechanism.

Research on Effects of Deicing Salt on Adhesion properties between Asphalt Mortar and Aggregate

88%

Li P. , Fu G. , Yang D. , Hu G. , Zheng J.

2012

tom R. 88, nr 1b

127-131

Through working out a indoor plan of the effects of deicing salt on adhesion properties between asphalt mortar and aggregate, based on innovative experiments with water boiled method to analysis of the effects of deicing salt on adhesion properties between asphalt and basalt and the effects of deicing salt on adhesion properties between SBS modified asphalt and basalt. The results show that specimens have a greater difference in adsorption capacity with the different effect solutions, through the effect of CaCl2�ANC, the adhesion properties of asphalt and mortar and aggregate have been improved to some extent. In addition, through the effect of different deicing salt, the discrete levels of adsorption capacity of specimen different are different, through the effect of CaCl2, adhesion improving while the instability of adsorption capacity have appeared, but NC is relatively stable. Therefore, comprehensive consideration of the appropriate choice of the type of deicing salt can effectively reduce the effects of deicing salt on adhesion properties between asphalt mortar and aggregate.

Artykuł analizuje wpływ soli użytej do odlodzenia na właściwości przyczepności między asfaltem a kruszywem. Odpowiedni dobór soli odmrażającej ma istotny wpływ na tę przyczepność.