Advanced Materials Research Vols. 760-762

Abstract: In this paper, we consider a set of inverse telecommunication network problem under norm. With the expansion of telecommunication network, more and more links and nodes will be added to the existed telecommunication network. The original network can not cover new nodes and some old links become useless. The telecommunication company wants to sell some old links and purchase some new links within a given budget, such that the network of the company is able to access all nodes. We consider the inverse problem by using weakly dominant set, which is to change the weights of the edges as little as possible such that the given edge set becomes a weakly dominant set under the new weights. In this paper, we propose a polynomial time algorithm for the inverse problem under norm, and we also present an example to illustrate the algorithm.

Abstract: Existed simulation works are always too dependent on a kind of particular techniques or tools to perform horizontal comparison and integration. There is no formal description for the simulation objects which leads to the lack of semantic support in the simulation. In order to guarantee the reusability and interoperability of heterogeneous models and services in satellite network simulation and provide verification support, a method based on ontology engineering is proposed. Based on the concept of simulation verification with semantic support, the purpose and requirements of applying ontology engineering in satellite network simulation are identified. A test is performed as to a specific simulation task, and the results show that, besides the semantic support, the former method can provide significant improvement in efficiency, which is over 200% in comparison with the latter one. It is concluded that it is quite feasible to apply ontology in the area of satellite network simulation.

Abstract: Based on the analysis of the development of the digital campus at home and abroad, and campus LBS service status and problems of the construction and campus information needs of spatial information services is considered we research the existing digital campus architecture and proposed the overall framework based on the digital area campus LBS platform and we design center platform, mobile terminal functional structure, the establishment of a terminal positioning campus LBS platform prototype demonstration system based on digital area map query, three-dimensional browsing, navigation guides, tracking and monitoring, and SMS notification,

Abstract: The self-organization characteristics and the interaction between a large numbers of self-organizing vehicles are complexity, to obtain a more accurate model of vehicular Ad-hoc network (VANET) and obtain a more profound comprehension of the complex behavior working mechanism of the vehicle in the VANET environment multi-agent based and bottom-up modeling approach is proposed here. It aims to describe the dynamics of VANET caused by the different behaviors of vehicular. The simulation tool for vehicular misbehaviors is developed with multi-agent. It aims to and be able to effectively reproduce the real VANET scene. Though the multi-agent based modeling the emergent behavior and sudden existing behaviors of VANET entities are well reflected.

Abstract: Minimization of energy consumption is one of the most important research areas in Wireless Sensor Networks. Nowadays, the paradigms of computational intelligence (CI) are widely used in WSN, such as localization, clustering, energy aware routing, task scheduling, security, etc. Though many fuzzy based clustering techniques have been proposed earlier, many of them could not increase the total network life time in terms of LND (Last Node Dies) with comparing to LEACH. In this paper, a fuzzy logic based energy-aware dynamic clustering technique is proposed, which increases the network lifetime in terms of LND. Here, two inputs are given in the fuzzy inference system and a node is selected as a cluster head according to the fuzzy cost (output). The main advantage of this protocol is that the optimum number of cluster is formed in every round, which is almost impossible in LEACH (low-energy adaptive clustering hierarchy). Moreover, this protocol has less computational load and complexity. The simulation result demonstrates that this approach performs better than LEACH in terms of energy saving as well as network lifetime.

Abstract: In underwater acoustic communication systems, the channel equalization community has recently given much attention to decision feedback equalization (DFE). It is because that the DFE offers intersymbol interference (ISI) cancellation with reduced noise enhancement. However, its key algorithm such as constant modulus algorithm (CMA) has moderate convergence rate and steady-state mean square error (MSE), which is not sufficient for the receive system of communication. So a new cost function is defined and then a novel DFE based on such cost function is proposed. The efficiency of the proposed DFE is proved by computer simulations.

Abstract: We propose a high tunable plasmon-induced transparency metal film structure which can be performed by double two-dimensional hexagonal lattice array of plasmonic nanoparticles inserted with a continuous metal film. The structure shows metal transparency in the optical regime. The transparency response in this structure can be efficiently modified by varying the thickness of the metal film, the size of nanoparticles, and the position of the nanoparticles. The structure proposed here may provide a new alternative approach to obtain transparent and highly conducting metal structures with potential applications in optoelectronic integrated circuits, plasmonic filters and transparent conductors.

Abstract: Bi₅AgM₄O₁₈ (M=Nb and Ta) photocatalysts with 3.07-3.55eV of band gaps and layered perovskite-like structures showed activities for 2-propanol degradation in gas phase. Due to the appropriate crystal structure and energy band structure, Bi₅AgNb₄O₁₈ performed much better than Bi₅AgTa₄O₁₈ for 2-propanol photodegradation.

Abstract: Ceramics of (1-x)CaCu₃Ti₄O₁₂-xBi_2/3Cu₃Ti₄O₁₂, i.e., CCTO-BCTO, with x=0, 0.01, 0.1 and 0.25, respectively, were prepared via the conventional solid-state reaction. The phase structure of the ceramics was identified by X-ray diffraction. The microstructure of the sample was observed with scanning electron microscopy. Dielectric properties and impedance spectroscopy were measured using a LCR Meter, in which 0.9CCTO-0.1BCTO displayed highest dielectric constant (584108) and lowest dielectric loss (0.42) at 1kHz among the four kinds of specimens. Based on series of experimental results, an optimum amount of x was able to improve the dielectric properties of CCTO-BCTO, through adjusting the impedance characteristics of the grain and grain boundary.

Abstract: In this paper, the ZrInZnO thin film has been prepared by solution method. The influence of heat treatment conditions on film properties has been analyzed. With the treatment temperature and time increase, the Hall mobility and square resistance of the film were increased and reduced respectively. In addition, we analyzed the role of heavy metal Zr on oxygen vacancies in the semiconductor oxide combined with heat treatment results and the chemical reaction process. It has been found that heavy metal Zr has binding effect on oxygen, it effectively inhibits the generation of oxygen vacancies, thereby reducing the number of oxygen vacancies, but at the same time causing certain binding effect to carriers.