Shaoyin Wang

A train positioning mechanism for medium-low speed maglev train based on parity check cross coding inductive loop wire

Medium-low speed maglev, as a form of urban rail transportation system, has already drawn a lot of attention from researchers and engineers for its advantages of low noise, strong climbing ability and flexible route planning. The train positioning system, as a matter of fact, is a very important part in operation and control system (OCS) of medium-low speed maglev transportation, for it collects real-time train position data, and helps OCS to send correct train dispatching order so as to ensure train operation safety. Cross coding inductive loop wire, which is suitable for the positioning of non-contact moving objects, has been recognized as one of the most promising train positioning method for medium-low speed maglev. However, as reports on cross coding inductive loop wire based train positioning method for medium-low speed maglev transportation system can hardly be found till now, the reliability of absolute address code reading for such positioning method still remains to be discussed and analyzed specifically. In this paper, a novel system design for cross coding inductive loop wire based train positioning system has been proposed, by adding a parity check cross inductive loop line, namely adding a new bit onto the original absolute address code sequence in each minimum positioning section, the reliability of address code reading for train positioning can be evidently enhanced.

Mathematical Verification for Transmission Performance of Centralized Lightwave WDM-RoF-PON with Quintuple Services Integrated in Each Wavelength Channel

Wavelength-division-multiplexing passive-optical-network (WDM-PON) has been recognized as a promising solution of the “last mile” access as well as multibroadband data services access for end users, and WDM-RoF-PON, which employs radio-over-fiber (RoF) technique in WDM-PON, is even a more attractive approach for future broadband fiber and wireless access for its strong availability of centralized multiservices transmission operation and its transparency for bandwidth and signal modulation formats. As for multiservices development in WDM-RoF-PON, various system designs have been reported and verified via simulation or experiment till now, and the scheme with multiservices transmitted in each single wavelength channel is believed as the one that has the highest bandwidth efficiency; however, the corresponding mathematical verification is still hard to be found in state-of-the-art literature. In this paper, system design and data transmission performance of a quintuple services integrated WDM-RoF-PON which jointly employs carrier multiplexing and orthogonal modulation techniques, have been theoretically analyzed and verified in detail; moreover, the system design has been duplicated and verified experimentally and the theory system of such WDM-RoF-PON scheme has thus been formed.

Modeling the Trend of Credit Card Usage Behavior for Different Age Groups Based on Singular Spectrum Analysis

Credit card holders from different age groups have different usage behaviors, so deeply investigating the credit card usage condition and properly modeling the usage trend of all customers in different age groups from time series data is meaningful for financial institutions as well as banks. Until now, related research in trend analysis of credit card usage has mostly been focused on specific group of people, such as the behavioral tendencies of the elderly or college students, or certain behaviors, such as the increasing number of cards owned and the rise in personal card debt or bankruptcy, in which the only analysis methods employed are simply enumerating or classifying raw data; thus, there is a lack of support in specific mathematical models based on usage behavioral time series data. Considering that few systematic modeling methods have been introduced, in this paper, a novel usage trend analysis method for credit card holders in different age groups based on singular spectrum analysis (SSA) has been proposed, using the time series data from the Survey of Consumer Payment Choice (SCPC). The decomposition and reconstruction process in the method is proposed. The results show that the credit card usage frequency falls down from the age of 26 to the lowest point at around the age of 58 and then begins to increase again. At last, future work is discussed.

Reliability enhancing mechanism for train positioning based on cyclic check cross coding inductive loop wire for medium-low speed maglev

As a form of urban rail transit, medium-low speed maglev transportation system also requires safety-critical design in its operation and control system (OCS), for the OCS system relates to not only operation efficiency, but system reliability and safety as well. The train positioning system, which is the most important component in OCS, counts the real-time train position and helps OCS to give the correct, safe train dispatching order. Cross coding inductive loop wire has been recognized as one of the most suitable technique in solving the positioning problem of train which has no contact with the track, however, reports on the train positioning system based on cross coding inductive loop wire for medium-low speed maglev are still rare to be seen, especially reports on enhancing the positioning reliability. In this paper, a reliability enhancing mechanism for train positioning based on cyclic check cross coding inductive loop wire for medium-low speed maglev has been proposed, by adding check inductive loop bits according to cyclic check principle onto the original address code sequence in each minimum positioning section, the reliability of acquiring the correct original address code for the positioning system can be enhanced. Simulation has been done to verify such enhancement, and the comparison of positioning performance between parity check and cyclic check cross coding inductive loop wire has also been done in this paper.

An EMD–SARIMA-Based Modeling Approach for Air Traffic Forecasting

The ever-increasing air traffic demand in China has brought huge pressure on the planning and management of, and investment in, air terminals as well as airline companies. In this context, accurate and adequate short-term air traffic forecasting is essential for the operations of those entities. In consideration of such a problem, a hybrid air traffic forecasting model based on empirical mode decomposition (EMD) and seasonal auto regressive integrated moving average (SARIMA) has been proposed in this paper. The model proposed decomposes the original time series into components at first, and models each component with the SARIMA forecasting model, then integrates all the models together to form the final combined forecast result. By using the monthly air cargo and passenger flow data from the years 2006 to 2014 available at the official website of the Civil Aviation Administration of China (CAAC), the effectiveness in forecasting of the model proposed has been demonstrated, and by a horizontal performance comparison between several other widely used forecasting models, the advantage of the proposed model has also been proved.

An intelligent ODN approach in WDM-PON based on optically controlled optical switch matrix

Study on wavelength division multiplexing passive optical network (WDM-PON) related topic has been getting great development during recent years. As an important part in WDM-PON system, optical distribution network (ODN) serves as a signal switching part which multiplex and de-multiplex optical signal between optical line terminal (OLT) and optical network units (ONUs). It is of no doubt that the comprehensive resource management in ODN, namely the intelligent ODN (iODN) design, can enhance the efficiency of optical path dispatching. Till now, even if the work orders in optical path dispatching can be sent automatically by telecommunication operators via resource management system to the network transmission department, the specific wiring work of patchcord for optical path distribution in ODN is still realized manually. Related researches of iODN have been mainly focused on adding different types of electronic tags in patchcords, which still gets manual work involved in wiring. Consider that the techniques in optically controlled optical switch matrix have already been proved to be mature, in this paper, an iODN design approach for WDM-PON has been proposed. By a thorough discussion of design scheme and the working principle via case study, the advantage of such approach has been demonstrated.