sound_speed

MATLAB 数学工具软件实例简明教程 非常实用(MATLAB)

文章讲述了现在韩国的频谱政策和动态频谱接入技术。过去韩国的频谱管理政策需要特权，并且只有一小部分频谱可以公用。随着无线技术的发展，现在，韩国政府，使用了机遇动态频谱接入的新型频谱策略，例如LBT技术用于REID，UWB和FACS等。MIC还考虑如何在DTV过渡完成后，重新分配频谱。新型的无线电技术如认知无线电和SDR将在UHF边带中应用新的服务。MIC试图用一用有效地方式开放频谱并接受新技术用于频谱策略中。(In this paper, we introduce spectrum policies and dynamic spectrum access technologies in Korea. In the past, Korea spectrum management was the command and control with exclusive usage rights and small portions of spectrum commons bands. With the development of the radio technologies, Recently, Korea government, MIC(ministry of information and com- munication), has been adopting new spectrum policies based on dynamic spectrum access technology such as LBT(Listen Before Talk) for RFID, UWB, and FACS(Flexible Access Common Spectrum) etc. MIC is also considering spectrum reallocation of digital dividend bands after DTV transition. New radio techniques such as cognitive radio and SDR will be applied to new services in this UHF band. MIC is trying to open the radio spectrum in an efficient way and adopt new technology into spectrum policy. Thus MIC is extending the open spectrum such as spectrum commons and spectrum liberalization bands. )

说明：  viterbi算法在matlab环境下的具体实现程序。(viterbi algorithm matlab environment in the concrete realization of the procedure.)

matlab扩展编程，附有详细代码及说明，均可用(matlab extension programming, including a detailed codes and instructions are available)

QPSk的仿真程序，包括AWGN信道和瑞利信道波形以及星座图(QPSk simulation procedures, including the AWGN channel and Rayleigh channel waveforms as well as the constellation diagram)

Symmetry, probability, and recognition in face space

Abstract—In this paper, a new lossy technique based on wavelet transform for compression of breast ultrasound images is presented. The experiments are performed on 16 different wavelet functions and the quality of reconstructed images is evaluated by using Compression Ratio (CR), Normalized Mean Square Error (NMSE), Normalized Absolute Error (NAE), and Peak Signal to Noise Ratio (PSNR) criterion. An ultrasonographer performed the subjective assessment. This study shows that among the utilized wavelets,

matlab奇异值分解的范例程序，对数据进行降噪处理。(Singular Value Decomposition matlab sample program for data processing for noise reduction.)

机器人编队仿真程序，采用人工势场法，可以实现编队，避障等功能。(Robot formation simulation program)

我用Matlab编写的CG算法，很好用,输入A,b,x的精确解，求解x及误差曲线。(I used Matlab prepared CG algorithm, a very good use, type A, b, x the exact solutions, to solve x and error curve.)