今天,智能电视已经成为了我们生活的必需品.我们可以通过智能终端看电视、查看电子邮件或日程安排、保存备忘录,还可以通过社交应用与同事交流.由于其广泛应用于日常生活中,智能电视用户的很多个人信息,如计划、商业文件、电子邮件密码,甚至于个人照片都保存在智能电视中,这些重要信息均在有意与无意中成为黑客攻击的目标.尽管大多数人尚未察觉,智能电视的安全性比以往任何时候都更危险.所以智能电视操作系统的安全性是非常重要的.本文提出了一种智能电视操作系统的安全增强策略.

A highly-sensitive pharmacokinetic diffuse fluorescence tomographic system is proposed to achieve the indocyanine green (ICG )pharmacokinetic imaging of small animals. The system employs a photon-counting technique based on discrete optical fiber measurement of computed tomography scanning mode in the computer tomography, which effectively improves spatial sampling resolution of the system on the premise of high sensitivity and wide dynamic measurement range. Meanwhile, it adopts serial-parallel mixed measurement mode through switching four photomultiplier tube photon-counting channels by optical switch to obtain a balance between time resolution of measurement and cost-effectiveness of the system. We investigate the principle validity of the system by designing a dynamic phantom that can simulate ICG metabolism in living tissue. In addition, combined with the algorithm of fluorescent agent pharmacokinetic imaging developed by our laboratory, the reconstruction of ICG metabolic velocity is realized. Experimental results show that the proposed system has high sensitivity, spatial resolution and quantitativeness.

A new instrument was designed in order to find a new method for collecting cun-guan-chi pulse signals. The cun-guan-chi pulse acquisition system was designed with pulse sensors which were combined in a way to solve the problem of space limitation. A single chip microcomputer called ADuC 845 was used in the control system. Signals were preprocessed by removing noise and baseline remedy. Time domain parameters and frequency domain parame-ters were extracted by some new methods. A new vascular model was established to study the best pulse pressure. Ac-cording to the analysis data, the interaction effect between cun-guan-chi was preliminarily quantified. Palm bow by-pass effect,pressure taken resistance effect and artery blood vesselmodel were verified. With the quantification of the relationship, pressure control in cun-guan-chi pulse collection will be more scientific, which can better objectify the pulse diagnosis of traditional Chinese medicine.

Based on the cun-guan-chi pulse acquisition instrument,a new method for multi-channel pulse acquisition was explored in this paper,and the effect of pulse condition information varying with single sensor pressure of other departments was studied.Moreover a new method named NILP(new intersection points of lines and pulse wave-form)was proposed.LIP(lowest point in one period)algorithm based on cubic spline interpolation and wavelet trans-form was used to preprocess cun-guan-chi signals.The multiple features of time and frequency domain parameters were extracted by NILP,spectral ratio,the wavelet entropy and HHT(Hilbert-Huang transform).The results show that increasing pressure in chi results in the smoothing phenomenon in time domain of cun and the decreasing of high frequency components in frequency domain of cun.For chi,with the increasing pressure in cun,steep phenomenon occurs in time domain,and high frequency components increase.There exists a quantitative relationship for cun-guan-chi best feeling pressure.The effect relationship indicates that there is a great difference between single-portion and multi-portion pulse acquisitions,and it is essential to establish a standard for three-portion pulse by the accumu-lation of clinical samples.

Pulse manifestation in Traditional Chinese Medicine (TCM) was formed by pulse wave which is affected by body’s physiological parameters. The best pressure to acquire pulse wave was an important part of objective study of TCM pulse diagnosis, which was assumed and analyzed according to the rule of thumb before and there was no theoretical basis for it. Therefore, studying the best pressure to acquire pulse wave in the light of radial artery blood flow model has an important significance for the improvement of electropulsograph and the objective research of TCM pulse diagnosis. According to the theories and methods from hemodynamics and the existing equivalent model of radial artery blood vessel, blood flow model of different pressure from the outside was built. Meanwhile, the relationship between pulse pressure and the pressure to acquire pulse wave was derived, which explains the best pressure to acquire pulse waves in theory. And the mathematical model of the best pressure to acquire pulse wave was verified by normal pulse, floating pulse, deep pulse--three clinical cases which collected by electropulsograph. The clinical results were as follows: The best pressure to acquire pulse wave varies with pulse manifestation. The peak value of normal pulse first rises and then decreases, the best pressure to acquire pulse wave is in the moderate pressure. The peak value of floating pulse increases continuously, the best pressure to acquire pulse wave is in the light pressure. And the peak value of deep pulse has been reduced, the best pressure to acquire pulse wave is in the heavy pressure. Clinical results are in reasonable agreement with theoretical proof, it testified that pulse pressure and the pressure to acquire pulse wave are closely related, and the maximum value of pulse pressure is the best position to acquire pulse wave.

随着“三网融合”地不断推进,智能终端上承载的内容日趋多样化.如何确保下一代广播电视网络TVOS操作系统在智能电视终端平台上运行的各种数字电视业务的安全性、满足广电运营商对智能电视终端安全的要求是目前急需解决的关键技术问题.操作系统自身的安全尤为重要,本文从技术及安全角度对下一代广播电视网络TVOS智能电视操作系统的安全机制、安全体系架构加以分析论述,提出了广电智能终端操作系统自身的安全模型及技术实现方案.

To cope with the low quantification in the established optical topography that originates from the exces-sively simplified computation model based on the modified Lambert-Beer’s Law(MLBL),we proposed a least-squares fitting scheme for time domain optical topography that seeks data matching between the time-resolved meas-urement and model prediction calculated by analytically solving the time-domain diffusion equation in semi-infinite geometry. A series of experiments were also conducted,including simulation and phantom verification.The phan-tom verification was performed with multi-channel time-resolved measurement system based on TCSPC.Our simula-tive and phantom experiments demonstrate that the proposed curve-fitting method is on the whole,superior to the conventional MLBL-based one in quantitative performance.

为解决含有低散射、高吸收和空腔区域组织内扩散方程光子输运模型的不适用性,发展了基于图形处理单元（GPU）加速的任意复杂组织体光子输运的蒙特卡罗建模方法。在此基础上,提出了基于蒙特卡罗正向模型的时域荧光扩散层析广义脉冲谱技术法。模拟结果表明,与扩散方程相比,基于蒙特卡罗模拟的时域荧光扩散层析对含有低吸收高散射、低吸收低散射、高吸收低散射、高吸收高散射和空腔异质体的复杂组织体中荧光目标体的位置和形状都进行了更准确的重建,从而验证了这种荧光图像重建方法的通用性。

IEEE 802.16 has feature of connection-oriented, which can provide QoS guarantee for each connection. The standard defines the signaling mechanism for exchanging information between BS and SS in QoS architecture while it does not define the scheduling algorithm for uplink bandwidth allocation, so it has been the hot point for researching on IEEE 802.16. For real time service such as VoIP and flow media, it is very sensitive on delay and delay jitter. Considering this situation, this paper presents a scheduling algorithm utilizing adaptive data encoding and modulation technology. The stability of link transmission is guaranteed at the cost of lower the transmission rate by dynamically adjusting modulation and coding settings. Even if in the bad condition of wireless link, the QoS of connection can still be guaranteed, therefore it improve the performance of real time service.