Jiaxing, China
Jiaxing, China

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Zheng W.,Tongji University | Zheng W.,Jiangsu University | Nai W.,Tongji University | Yan Y.,Tongji University | And 3 more authors.
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

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. © 2016 IEEE.

Chen S.,Tongji University | Nai W.,Tongji University | Zhang F.,Tongji University | Wang S.,Tongji Zhejiang College | And 2 more authors.
Advances in OptoElectronics | Year: 2015

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. © 2015 Shuai Chen et al.

Zhou S.,Tongji University | Zhou S.,Tongji Zhejiang College | Wang S.-J.,Tongji University
Journal of Donghua University (English Edition) | Year: 2015

A diesel engine of conventional trucks has a low efficiency under the idling condition, leading to a high cost for heating or cooling in the cab during night. The solution to this problem will have great significance on energy conservation and emission reduction. A new auxiliary power unit of solid oxide fuel cell (SOFC-APU) with high efficiency solves this problem perfectly. Heat pump air conditioner is considered as a promising device for the application of SOFC-APU with a high cooling and heating efficiency. To make a quantitative analysis for the application of SOFC-APU, a model is built in Matlab/Simulink. The diesel engine model and SOFC-APU model are fitted based on some experimental data of SOFC-APU and diesel engine during the idling operation. An analysis of the application of SOFC-APU on different trucks in Northeast China is comprehensively made, including efficiency and emission. Copyright © 2015 Editorial Department of Journal of Donghua University, Shanghai, China. All rights reserved.

Zhang G.-X.,Tongji Zhejiang College | Guan L.-B.,Tongji Zhejiang College
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Based on the soil-nailing tensile experiments under different pressure grouting parameters, the effect of grouting parameters such as grouting amount and water-cement ratio on bearing capacity of soil nailings with different lengths is analyzed. The results show that, in the experimental range, under the same quantity of grouting, the ultimate tensile strength of soil nailings increases with the decreasing water-cement ratio. Specifically speaking, for the short soil nailings with higher grouting quantity in unit length, the higher the grouting quantity is, the lower the effect of water-cement ratio on the change rate of the ultimate tension is. On the contrary, for the long soil nailings with lower grouting quantity in unit length, the effect of water-cement ratio on the change rate of the ultimate tension is larger while the quantity of grouting is higher. Meanwhile, under the same water-cement ratio, the maximum tensile strength of soil nailings increases with the quantity of grouting increases. Here, for the short soil nailings with higher grouting quantity in unit length, the higher the water-cement ratio is, the larger the effect of grouting quantity on the change rate of the ultimate tension is. Conversely, for the long soil nailings with lower grouting quantity in unit length, the higher the water-cement ratio is, however, the lower the effect of grouting quantity on the change rate of the ultimate tension is.

Nai W.,Tongji University | Chen Y.,Tongji University | Yu Y.,Tongji University | Zhang F.,Tongji University | And 2 more authors.
Proceedings - 2016 IEEE International Conference on Vehicular Electronics and Safety, ICVES 2016 | Year: 2016

The absolute positioning technique based on cross coding inductive loop wire has been recognized as the most suitable one to be applied in medium-low speed maglev train system, and the speed measuring method which utilizes the information collected from the lowest address code line has also been recognized as a reliable way for such system. Consider that cross coding inductive loop wire based positioning and speed measuring system is a kind of wireless communication system, it is for sure to be affected and interfered by the complicated electromagnetic environment in along the track line in engineering application. Many related research have already been focused on the analysis of the interference elimination scheme in theory, few of them has taken engineering application into consideration, thus, many potential problems which might affect the positioning and speed measuring in practice are required to be discussed and analyzed via real vehicle experiment. In this paper, based on the experiment data collected in the medium-low speed maglev experimental line in Shanghai Lingang New City, several details in positioning and speed measuring system design have been discussed and optimized, and the corresponding improved results have been demonstrated. © 2016 IEEE.

Zhong Y.-W.,Renmin University of China | Zhong Y.-W.,Tongji Zhejiang College | Li T.,Renmin University of China | Han Q.,Renmin University of China | Han Q.,University of Hong Kong
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

From the perspective of thermal fluctuations, we investigate the pseudogap phenomena in underdoped high-temperature curpate superconductors. We present a local update Monte Carlo procedure based on the Green's function method to sample the fluctuating pairing field. The Chebyshev polynomial method is applied to calculate the single-particle spectral function directly and efficiently. The evolution of Fermi arcs as a function of temperature is studied by examining the spectral function at Fermi energy as well as the loss of spectral weight. Our results signify the importance of the vortexlike phase fluctuations on the formation of Fermi arcs. © 2011 American Physical Society.

Zhu B.,University of Shanghai for Science and Technology | Zhu B.,Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering | Sun X.-J.,University of Shanghai for Science and Technology | Sun X.-J.,Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering | And 3 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2015

3D numerical simulation of a H-type Darrieus vertical axis wind turbine with blade-tip end plates was performed by means of a self-developed computational uid dynamics (CFD) code UCFD. The effects of geometrical parameters such as shape and size of the end plate on the aerodynamic performance of Darrieus wind turbine were investigated. Numerical results indicate that the vortex at the leading edge of rotor blade can be suppressed by adding a at plate at both ends of its blade and an improved blade-tip surface pressure distribution can be found. As a result, the efficiency and stability of such type of wind turbine can be evidently promoted. © 2015, Science Press. All right reserved.

Zhang G.-X.,Tongji Zhejiang College | Guan L.-B.,Tongji Zhejiang College
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

Based on the analytical solution for soil nailing tension model and the field measured data of soil nailing tensile test,the influences of elastic modulus of cement grout Eg and shear deformation coefficient of soil nailing K on the mechanical properties of soil nailing are analyzed. The results show that the displacement of nail head under the maximum loading decreases as Eg increases. With the increase of Eg, the relative displacement and shear force between soil and nail, decrease in the shallow part of the nail body, and increase in its deep part, respectively. Furthermore, the variations of relative displacement and shear force between soil and nail along the nail body direction become much smaller with the increase of Eg, resulting in more homogeneous distribution of side friction resistance along the nail body. As K increases, the relative displacement between soil and nail under the maximum loading decreases and the variation of relative displacement along the nail body direction becomes much smaller, indicating the effect of grouting on soil nailing gradually becomes marginal. With the same change rate of K and Eg,the influence of K on the load-displacement curve of soil nailing is greater than that of Eg, while the influence of K on the shear force between soil and nail is lower than that of Eg. ©, 2014, Academia Sinica. All right reserved.

PubMed | Chi Mei Medical Center and Tongji Zhejiang College
Type: Journal Article | Journal: BMC medical research methodology | Year: 2017

Many continuous item responses (CIRs) are encountered in healthcare settings, but no one uses item response theorys (IRT) probabilistic modeling to present graphical presentations for interpreting CIR results. A computer module that is programmed to deal with CIRs is required. To present a computer module, validate it, and verify its usefulness in dealing with CIR data, and then to apply the model to real healthcare data in order to show how the CIR that can be applied to healthcare settings with an example regarding a safety attitude survey.Using Microsoft Excel VBA (Visual Basic for Applications), we designed a computer module that minimizes the residuals and calculates models expected scores according to person responses across items. Rasch models based on a Wright map and on KIDMAP were demonstrated to interpret results of the safety attitude survey.The author-made CIR module yielded OUTFIT mean square (MNSQ) and person measures equivalent to those yielded by professional Rasch Winsteps software. The probabilistic modeling of the CIR module provides messages that are much more valuable to users and show the CIR advantage over classic test theory.Because of advances in computer technology, healthcare users who are familiar to MS Excel can easily apply the study CIR module to deal with continuous variables to benefit comparisons of data with a logistic distribution and model fit statistics.

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