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Articles by Bin Zhou
Total Records ( 12 ) for Bin Zhou
  Bin Zhou , Xiao-Lin Yang , Rui Liu and Wei Wei
  In many practical fields, image segmentation is the most important procedure. The purpose of image segmentation is to detect the objects in images. The methods based on statistic theory can work well on images with no noise or little noise. But the procedure of segmentation is difficult to be obtained and the accuracy of result often depends on some artificial parameters. A lot of physical phenomenon can be described by Partial Differential Equations (PDEs) and related procedure is easy to be displayed. With the applications of PDEs, it is convenient to accomplish segmentation and represent the procedure.
  Wei Wei , Ang Gao , Bin Zhou and Yiduo Mei
  A number of recent advances in MAC protocols for wireless sensor networks have been proposed to decrease idle listening. Low-Power-Listening (LPL) protocols transmit data packets for the inter-listening interval, for this reason, allowing sensor nodes to sleep for long periods of time between channel probes. The inter-listening interval as well as the particular type of LPL protocol ought to well match the network conditions. Some LPL protocols break communication between the sender and the receiver after the data packet has been successfully received. In this study, a novel variable rate based time frame scheduling scheme is proposed to further reduce collisions and improve energy saving in wireless sensor networks. During this pre-schedule slot, each node knows exactly the schedule of other neighbor nodes. Multi-rate and power scaling are adopted to achieve further energy saving by employing an acceptable rate rather than the maximum rate. Data rate is dynamically adjusted according to the traffic load of sending nodes in an energy efficient data rate to retrench energy. Compared with Z-MAC, performance in the present study proves to have better ability of local framing pre-schedule and multi-rate achieves better energy efficiency. Our results show that using the improved method of the MAC schedule provides up the enhancement of lifetime for different traffic scenarios.
  Wei Wei , Bin Zhou , Ang Gao and Yiduo Mei
  A number of practical events result in a natural information potential field in the proximity of the phenomenon. A novel method is proposed in this study to approximate the information potentials fields in Wireless Sensor Networks (WSNs). The moving least-square method is introduced to solve related Partial Differential Equations (PDEs). This equation determines a smooth edition of the intrinsic potential field maintained major characters which is propitious to most applications of WSNs. For instance, navigation in parking yards, temperature, motion or pollutants, etc. The association between the nodes and the local information level are also considered in this method. Various information potentials fields can be integrated together naturally attribute to the well property of the PDEs. Efficiency and stability of our scheme are verified by numerical examples. The simulation results make clear that the presented way is advantageous to be used in WSNs.
  Bin Zhou , Xiao-Lin Yang and Wei Wei
  Sensornets is an important activity in the fields of computer science. Every sensor node collects the information and cooperates with others for certain purpose. A smooth version of the information distribution on the nodes is expected for some applications. Partial Differential Equations (PDEs) are introduced to determine such information potential fields and they can be solved by some numerical methods. The solutions preserve major features of original distributions which are advantageous to most applications such as navigation in parking lots, environment monitoring, etc. The simulation results show that such methods are convenient to be applied in sensornets.
  Xiao-ju Long , Ying-hua Liu and Bin Zhou
  This study proposed a location model for information sources in sensornets and it can be applied in environment monitoring. A Partial Differential Equation (PDE) is introduced to describe the pollution evolution in a certain region. With the observation data collected by the sensor nodes, several parameters can be determined by an optimization problem. With solving the related partial differential equation, the evolution of the pollution can be represented and the sources can be located easily. It is useful for government and managers to reduce pollution. The efficiency and the accuracy of the proposed model are shown in presented numerical examples.
  Wei Wei and Bin Zhou
  A novel p-Laplace equation model is proposed in this paper for image denoising. First, the p-Dirichlet integral and total variation are combined to create a new energy functional used to built an image denoising model. This model is the generalization of Rudin-Osher-Fatemi model and Chambolle-Lions model. Then the existence of the solution can be obtained by the good properties of some functions in the nonlinear evolution equation. The numerical experiments with different parameters are implemented at last. The simulation results show the accuracy and efficiency of our method.
  Yan-Chao Zhao , Yan-Chang Liu , Li-Qun Shan and Bin Zhou
  Intelligent Transportation System (ITS) plays an important role in traffic controlling and traffic guidance which can greatly reduce the cost and pollution. In some senses, efficient traffic controlling is supported by accurate forecasting of the traffic flow and Kalman filter is one of the most used techniques. This study researches some dynamic behaviors of the Kalman filter in traffic flow forecasting. First, some observation nodes are proper set and the traffic flow data can be collected. Then Kalman filter is introduced to forecast the future traffic flow. Finally, the relation between dynamic parameters and forecasting result is analyzed. Several experiments are introduced to verify the conclusion.
  Yan-Chao Zhao , Jian-Feng Wu , Yan Zhang and Bin Zhou
  With the rapid development of Intelligent Transportation Systems (ITS), traffic controlling and traffic guidance have become a hot research issue. Better traffic controlling can reduce the cost and pollution efficiently. This study researches traffic flow forecasting in Sensornets. First, some observation nodes are proper set and the traffic flow data can be collected. Then wavelet is introduced to reduce the noise of the traffic flow data. Kalman filter is also introduced to forecast the next traffic flow and the result will be more advantageous for traffic controlling. The efficiency and the accuracy of the proposed model are shown in presented numerical examples.
  Wei Wei , Xiang Li , Bin Zhou , Hongfang Zhou , Peiyi Shen , Lei Wang and Jing Zhang
  Wireless Radio Frequency (RF) technology, which can take the place of cable, has been widely used in many current fields as one of information technologies with widest horizon of development. The problems caused by the environment restrictions and the unfavorable conditions for cable wiring have been solved because of the emergence of the wireless. Its three important characteristics and advantages are low costing, low power consumption and peer-to-peer communication. During the design procedure, the system is divided into three major modules according to the functional structure, namely central control module, wireless transceiver module and computer dealing software, The central control module uses Sygnal company's low power enhanced 51 MCU C8051F310 as CPU, mainly to complete the data acquisition and processing. The wireless transceiver module is made up of TI CC1101 wireless transceiver chip, which mainly realizes wireless data transmission and The computer dealing software real-timely displays and deals with the data through visual, friendly programming interface, based on C#.NET. Final achievement of the system design is two compact communication devices, one of them connects with PC through RS-232 interface, System is operated through the graphical user interface based on windows, which is very convenient to operate. Debugging result indicated that data acquisition, processing and transmission could be achieved in wireless or wired way under the control of PC and it visually displays the results to the user, satisfies request of the wireless power monitoring data communication system, reaches the technical index.
  Xiao-Lin Yang , Yu-Mei Chen and Bin Zhou
  Many application scenarios have been revealed with Wireless Sensor Networks (WSNs). An Error Correcting Code (ECC) will be advantageous to communications in these applications. With the different expecting on efficiency, security, usability, etc., different codes have been constructed for various purposes. The methods based on algebra theory can work well for constructing simple and usability codes. The theory of algebraic geometry can help construct more complex codes with different properties. With the applications of these codes, it is convenient to arrive the purpose in digital communications.
  Bin Zhou , Chang Ping Wei , Chun Jia Peng and Yue Chun Yu
  Assembly system with MCM-41 as a host and TAP (Tb(aspirin)3phen) as an active optical guest was synthesized at room temperature, and the interrelated products of MCM-41 and TAP systems were examined for comparison. The structures and the physical properties of the samples were characterized by a combination of techniques, such as XRD and N2 adsorption-desorption. Excitation and emission spectra were carried out to explore the photoluminescence (PL) properties of the samples and the relationships between the optical guest and the inorganic host. The results from these characterizations showed that the TAP is incorporated into the channels of MCM-41 and can increase the framework order of MCM-41. The reduction in the specific surface area of TAPMA (Tb(aspirin)3phen-MCM-41A) compared with that of MA (MCM-41A) imply that the TAP is confined inside the channels of MA. Based on the analyses of the excitation spectra, we suggested that the surface environment of MCM-41 affects the energy absorption of the organic ligands. PL of TAPMA and TAPMB show TAP in the different chemical environments, and a strong green PL had been observed in the TAPMA system while a much weaker light in the TAPMB system.
  Han DING , Ren-Chao WANG , Jia-Ping WU , Bin ZHOU , Zhou SHI and Li-Xia DING
  Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) images in 1985, 1986, 1993, 1994 and 2001 were used to quantify the land use and land cover changes (LUCC) in the Zhejiang coastal region with a stratified unsupervised classification technique in conjunction with visual interpretation and to attempt an identification of the socioeconomic driving forces. In level I an overall accurate classification was achieved using a modified Anderson`s I/II/III-level classification scheme. The overall accuracy of the land use classification at Anderson level I were 89.7% (1985), 91.6% (1993), and 90.4% (2001). The most rapid land use change was a dramatic increase in urban or built-up areas, which quadrupled from 1985 to 2001. Over 90% of this newly expanded built-up area was originally paddy fields or other croplands. In different parts of the Zhejiang coastal region, urban land expansion was spatially uneven. Temporally, land use development did not stabilized, and the two study periods of time (1985{1993 and 1993{2001) had different transition styles. Socioeconomic factors, such as gross domestic product, total population, and financial expenditure, were all highly correlated with the expansion of urban or built-up areas. Based on the degree of urban sprawl and socioeconomic factors, cities and towns were further divided into six subgroups, which may help decision makers improve land use for the region.
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