目的 研究豚鼠、大鼠和小鼠对脉冲噪音暴露的敏感性。方法 共分6组,第1组豚鼠(n=5)给予160 dB SPL50次脉冲噪音暴露;第2组豚鼠(n=5)予160 dB SPL 100次脉冲噪音暴露;第3组豚鼠(n=5)给予160 dB SPL 200次脉冲噪音暴露;第4组豚鼠(n=6)给予...目的 研究豚鼠、大鼠和小鼠对脉冲噪音暴露的敏感性。方法 共分6组,第1组豚鼠(n=5)给予160 dB SPL50次脉冲噪音暴露;第2组豚鼠(n=5)予160 dB SPL 100次脉冲噪音暴露;第3组豚鼠(n=5)给予160 dB SPL 200次脉冲噪音暴露;第4组豚鼠(n=6)给予160 dB SPL 400次脉冲噪音暴露。第5组10只Sprague-Dawley大鼠给予160 dB SPL 50次脉冲噪音暴露。第6组10只小鼠(Bagg Albino雌鼠与DBA雄鼠杂交)予160 dB SPL 50次脉冲噪音暴露。脑干诱发电位检测在脉冲噪音前,噪音后立刻、1 d、1、2、4周。结果 给予160 dB SPL50次脉冲噪音暴露后,大鼠和小鼠都显示暂时和永久的阈值漂移,豚鼠无暂时和永久的阈值漂移,给予160 dB SPL 400次脉冲噪音暴露后显示暂时和永久的阈值漂移。结论 豚鼠、大鼠和小鼠对脉冲噪音敏感性不同,豚鼠对脉冲噪音不如大鼠小鼠敏感,而大鼠比小鼠更敏感。展开更多
In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN...In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN), we investigate the statistical characteristics of in-phase and quadrature components of IN, and it is proved that unlike Gaussian noise (GN), they are dependent especially to IN with small impulsive indices, Then, making use of this dependence between in-phase and quadrature components, an ovel UWB radio receiver designed for IN is proposed. The exact expression for the average BER (bit error rate) of this receiver, which is a function of SNR (signal to noise power ratio) and threshold value, is derived. Thirdly, we'll discuss the optimum threshold value. We'll also estimate the performance of UWB radio systems with the proposed receiver designed for IN and with the conventional receiver designed for GN in INE. Numerical results show that the performance achieved by the proposed UWB radio receiver is much etter than that of the conventional UWB radio receiver. Meanwhile, it is shown that both impulsive index and threshold value have much effect on the performance of UWB radio systems under the condition of INE.展开更多
文摘目的 研究豚鼠、大鼠和小鼠对脉冲噪音暴露的敏感性。方法 共分6组,第1组豚鼠(n=5)给予160 dB SPL50次脉冲噪音暴露;第2组豚鼠(n=5)予160 dB SPL 100次脉冲噪音暴露;第3组豚鼠(n=5)给予160 dB SPL 200次脉冲噪音暴露;第4组豚鼠(n=6)给予160 dB SPL 400次脉冲噪音暴露。第5组10只Sprague-Dawley大鼠给予160 dB SPL 50次脉冲噪音暴露。第6组10只小鼠(Bagg Albino雌鼠与DBA雄鼠杂交)予160 dB SPL 50次脉冲噪音暴露。脑干诱发电位检测在脉冲噪音前,噪音后立刻、1 d、1、2、4周。结果 给予160 dB SPL50次脉冲噪音暴露后,大鼠和小鼠都显示暂时和永久的阈值漂移,豚鼠无暂时和永久的阈值漂移,给予160 dB SPL 400次脉冲噪音暴露后显示暂时和永久的阈值漂移。结论 豚鼠、大鼠和小鼠对脉冲噪音敏感性不同,豚鼠对脉冲噪音不如大鼠小鼠敏感,而大鼠比小鼠更敏感。
文摘In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN), we investigate the statistical characteristics of in-phase and quadrature components of IN, and it is proved that unlike Gaussian noise (GN), they are dependent especially to IN with small impulsive indices, Then, making use of this dependence between in-phase and quadrature components, an ovel UWB radio receiver designed for IN is proposed. The exact expression for the average BER (bit error rate) of this receiver, which is a function of SNR (signal to noise power ratio) and threshold value, is derived. Thirdly, we'll discuss the optimum threshold value. We'll also estimate the performance of UWB radio systems with the proposed receiver designed for IN and with the conventional receiver designed for GN in INE. Numerical results show that the performance achieved by the proposed UWB radio receiver is much etter than that of the conventional UWB radio receiver. Meanwhile, it is shown that both impulsive index and threshold value have much effect on the performance of UWB radio systems under the condition of INE.
