Designation and Realization of Softswitch-based Remote Video-monitoring System

In this paper, architecture of softswitch-based Next Generation Network （NGN） system and Session Initiation Protocol （SIP） are studied briefly, and the problems on the openness and extensibility of normal remote video-monitoring system （RVMS） are analyzed. Then a RVMS framework model based on softswitch is given. Furthermore, designation and realization of the system based on T 6000 Softswitch Platform is provided. The innovation is considering the RVMS as a part of softswitch system. It is a feasible scheme for implementing next generation video-monitoring system based on broadband IP technique.     

SF VECTOR CONTROL SYSTEM WITH TWO SINGLE CHIP MICROPROCESSORS

This paper introduces a SF vector control system of a slip frequency controlled induction mo-tor with simple structure,fair performance and convenient operation.It is realized by two singlechip microprocessors and fed from SPWM-GTR inverter.The whole system is combined by twosubsystems,both of them are 8031 single chip microprocessors.The communication between themis coordinated by the full duplex serial port within the chip and ask-and-answer communicationmanner.The error-corrected means adopted has improved the operation reliability of the system.A series of experimental results on a 3 kW induction motor are given at the end of this paper.     

A policy-based billing management architecture for the next generation IP-based network

IP billing is not only a basic functionality to operate IP sen＇ices, but also it is fundamental to offer customers with a stable and QoS-enabled network environment. As IP-based network has been widely agreed to be the core network of NGN, and existing IP billing system is too simple to fulfill the emerging requirements, the next generation IP billing has become an interesting topic in recent years. Policy-based management brings flexibility and scalability to systems by describing management logic and functions through policies, and thus reduces the complexity of the management of large-scale systems. Working on existing efforts, this paper proposed an improved IETF policy framework based upon which a policy-based billing management architecture for the next generation IP-based network was presented. Then a prototype with some basic functionalities was developed. The results of the experiment validated the expected improvements specified in this paper.     

Thermal diffusivity determination of solids by time-domain photoacoustic piezoelectric technique

Thermal–physical property is one of the most important properties of materials. The conventional frequency-domain photoacoustic piezoelectric(PAPE) technique has been developed as an important method for thermal diffusivity determination. In this paper, the PAPE technique is extended to time domain(TD). First, based on a simplified thermoelastic model, the TD PAPE theory under square-wave-modulated excitation was developed,the dependence of the TD PAPE signal on modulation frequency as well as material parameters was obtained, and the determination of thermal diffusivity was simulated and theoretically analyzed. Second, the experimental system and the corresponding measurement method were established. Third, thermal diffusivities of various standard samples, such as copper, aluminum, and nickel, were measured, and the effectiveness of the technique was verified. The results show that the TD PAPE technique can provide a simple, fast and effective way for thermal diffusion study.     

Computed tomography of the acoustic nonlinearity parameter B／A for biological tissues via difference frequency wave from a parametric array in reflection mode

Based on the finite amplitude insert-substitution method, a novel technique to reconstruct the acoustic nonlinear parameter B/A tomography for biological tissues in reflection mode via the difference frequency wave generated by a parametric array is developed in this paper. An experimental system is established, and the beam pattern of the difference frequency wave is measured and compared with that excited directly from a transmitter at the same frequency. B/A tomography for several biological tissues including normal and pathological tissues, is experimentally obtained with satisfying quality. Results indicate that B/A imaging using this mode may become a novel modality in ultrasonic diagnosis.     

Control of the carrier-envelope phases of a synchronously pumped femtosecond optical parametric oscillator and its applications

The intrinsic synchronization, multi-color outputs and related carrier-envelope phases （CEP） among pulses bring advantages to synchronously pumped femtosecond optical parametric oscillators and the pumping sources for broadband frequency comb generation and ultrashort waveform coherent syn-thesis. In this paper, we discuss our latest research results in this field, which cover the following as-pects： the phase relationship and energy conservation law in an OPO and related experimental verifi-cation; control of the pumping Ti-sapphire femtosecond laser＇s CEP by self-referencing technology, and its repetition-rate locking by piezoelectric transducer （PZT）; CEP locking of the pulses from the OPO by beating the non-phase-matched visible outputs against pump supercontinuum to obtain a driving signal for a fast PZT on the OPO end mirror; the generation of a broadband frequency comb spanning from 400 nm to 2.4 μm with 1.2 kHz bandwidth; and the realization of coherent interference between phase controlled pump pulses and signal second harmonic pulses.     

The Real-Time Image Processing Technique Based on DSP

This paper proposes a novel real time image processing technique based on digital singnal processor （DSP）. At the aspect of wavelet transform（WT） algorithm, the technique uses algorithm of second generation wavelet transform lifting scheme WT that has low calculation complexity property for the 2 D image data processing. Since the processing effect of lifting scheme WT for I D data is better than the effect of it for 2 D data obviously, this paper proposes a reformative processing method： Transform 2-D image data to 1 D data sequence by linearization method, then process the 1 D data sequence by algorithm of lifting scheme WT. The method changes the image convolution mode, which based on the cross filtering of rows and columns. At the aspect of hardware realization, the technique optimizes the program structure of DSP to exert the operation power with the iwchip memorizer of DSP. The experiment results show that the real time image processing techniquc proposed in this paper can meet the real-time requirement of videoimage transmitting in the video surveillance system of electric power. So the technique is a feasible and efficient DSP solution.     

Energy Recycling in Municipal Refuse and Its Pollution Control in Combustion

Recycling the energy in municipal refuse and controlling the secondary pollution are common concerns. After analyzing the status and disposal of the municipal refuse in China, this paper proposes a technique of refuse incineration, using a fluid-bed incinerator, which converts refuse into energy. The technique of controlling secondary pollution in combustion is also discussed. In this paper, the technique of incineration using a fluid-bed incinerator is introduced. During the combustion process, the refuse is mixed with coal and remover and a noxious gas removal system is installed, which helps to decrease the generation and emission of noxious material, such as dioxins. The result shows that the secondary pollution in refuse incineration is efficiently controlled.     

Review of wideband MIMO channel measurement and modeling for IMT-Advanced systems

In October 2005,the next generation mobile communication system was officially named as the International Mobile Telecommunications-Advanced(IMT-Advanced) by the ITU Radiocommunication Sector(ITU-R).Wideband multiple input and multiple output(MIMO) channel models in multiple propagation environments are fundamental for IMT-Advanced systems and such research has been initiated since 2003.The research challenges come from the fact that the wider bandwidth(20-100 MHz) and the advanced multiple antenna technology have been proposed for the IMT-Advanced system,thus leading to higher sampling rates and multiple spatial propagation channels.In this review,four aspects of wideband MIMO channel measurement and modeling are discussed:(1) radio channel measurement procedure and equipment;(2) large scale fading models;(3) small scale fading models;and(4) MIMO channel models.In particular,the large scale fading affected by the carrier frequency is investigated for urban macrocells and it shows that the higher carrier frequency results in greater loss for non-line-of-sight(NLoS) conditions in the cities of China,for which the frequency dependent factor is 32.1.Moreover,the dense and the obviously higher buildings also lead to a larger angle spread(AS) of both the angle of arrival and angle of departure in urban macrocell scenarios.The results indicate that there is the potential to explore the MIMO technique for an IMT-Advanced system with larger ASs,which would lead to the high system capacity.The progress on MIMO models is described and some methods for simplifying geometry-based stochastic channel models(GBSM) are proposed.Finally future research topics on channel measurement and modeling are identified.