In this dissertation we make a study of subliminal channels that conclude the progress , the application , the model , the construction , the stego - key , the capacity , the security , the way to realize subliminal - freeness , and so on 本文对阈下信道技术进行了比较全面的总结和研究，包括阈下信道的发展状况，应用前景，阈下信道的模型，构造方法，隐匿密钥，容量，安全性以及封闭方法等。
However , when the input noise is the double - peak gaussian mixture noise , the noise can improve the signal correlation for the subthreshold signal and the suprathreshold signal , i . e . , both sr and suprathreshold stochastic resonance ( ssr ) often occurs 而当输入噪声为双峰高斯混合噪声时，不仅输入信号在阈下时随机谐振现象有时存在，而且输入信号在阈上时噪声往往也能改善信号的相关性，即阈上随机谐振现象存在。
Results the results showed that the water extract of fructus schisandrae chinensis could markedly inhibit spontaneous motion , enhance the sleeping number of pentobarbital sodium ( subthreshold dosage ) and prolong the sleeping time of pentobarbital sodium ( superthreshold dosage ) 结果北五味子水提取物能明显减少小鼠自主活动次数，增加阈下剂量戊巴比妥钠致小鼠睡眠只数，延长阈上剂量戊巴比妥钠致小鼠睡眠时间。
A subliminal channel is a covert communication channel to send a message to an authorized receiver . this channel is constructed in the output crypto - data of an applied public - key cryptosystem such as digital signature , authentication , and so on . the message can not be discovered by any unauthorized receivers 阈下信道是指在基于公钥密码技术的数字签名、认证等应用密码体制的输出密码数据中建立起来的一种隐蔽信道，除指定的接收者外，任何其他人均不知道密码数据中是否有阈下消息存在。
We have studied pharmacodynamics of valepotriates through observing its effects on the times of spontaneous motion in mice , the sleep time of sodium pentobarbital ( superthreshold doses ) , sleep rate of sodium pentobarbital ( subthreshold doses ) , the number of writhes induced by acetic acid and seizures rate of metrazol . the experiment results proved that valepotriates could significantly decrease the times of spontaneous motion , prolong the sleep time of sodium pentobarbital ( superthreshold doses ) , enhance the sleep rate of sodium pentobarbital ( subthreshold doses ) , reduce the number of writhes induced by acetic acid and reduce the seizures rate of metrazol , so it showed high central inhibition effect , thus offer scientific foundation for its further exploitation and utilization 通过研究蜘蛛香中总缬草素对小鼠自发活动的影响、对戊巴比妥钠睡眠时间的影响、对戊巴比妥钠阈下剂量的影响、对小鼠扭体反应的影响、对戊四氮诱发惊厥的影响发现：总颗草素能明显抑制小鼠的自主活动，显著延长戊巴比妥钠致小鼠睡眠时间，明显提高阈下剂量戊巴比妥钠小鼠入睡数，对抗戊四氮诱发的小鼠惊厥，显示出较好的中枢抑制作用，为蜘蛛香的进一步研究开发提供了科学依据。
A general model of subliminal channels and some necessary conditions that the carrier cryptosystem must holds are given . a secret channel and an attack channel are first defined and some basic conclusions of the security are given . two new parameters , the embedding rate and the channel - using rate , that have large effects on the capacity and the security of subliminal channels are first defined 给出了阈下信道系统的一般模型和宿主密码系统须满足的必要条件，首次定义了阈下信道中的秘密信道与攻击信道，并给出关于安全性的基本结论，首次定义了对容量和安全性有一定影响的嵌入成功率和信道使用率两个新参数。
In order to study the effect of weak noise on the sound signal extraction of mouse ( mus musculus km ) inferior collicular ( ic ) neurons from environment , we examined the change in frequency tuning of neuron induced by a weak noise relative to 5 db below minimum threshold ( remt - 5 db ) of tone . 12 healthy adult mice ( 20 - 25 g , b . wt . ) 本实验旨在探讨弱噪声对小鼠( musmusculuskm )中脑下丘( inferiorcolliculusic )神经元声信号提取的影响及其神经机制，我们选用相当于纯音阈下5db的白噪声( whitenoise ) ，比较加入噪声前后神经元频率调谐曲线的变化和注射-氨基丁酸( - aminobutyricacid ， gaba )能受体拮抗剂荷包牡丹碱( bicuculline ， bic )后对该变化的影响。
The capacity of subliminal channels in elgamal signatures is studied . the capacity of broadband channel and the optimal schemes in 18 general elgamal signatures are analyzed . the relation between the capacity and the embedding rate of narrowband subliminal channels based on the exhausting search is studied 给出了容量的定义，理论上界以及影响容量的几个因素，给出了嵌入成功率和信道使用率对容量的影响，研究了elgamal签名中宽带信道的容量，分析了18种广义elgamal签名中的宽带阈下信道的容量并指出了最优方案，具体研究了基于搜索的窄带信道的容量与嵌入成功率的关系，具体研究了牛顿信道的带宽。
This mode of narrative adds in some way to the traditional bildungsroman : the differences between gender and narration , the restoration of historical actuality by " constructive imagination " as well as the promotion from social concern for the " individual " to individual ' s care of the self in bildungsromans , especially from the perspective of gender , those characters under assumptions and masks in previous literary works will be presented in a realistic manner 这一叙述形态对传统意义上的成长小说具有某种意义上的增值：性别与叙事的差异性、 “建构想象力”对成长历史真相的“还原” ，以及成长小说对“个人”由社会关怀推进到个体自我的关怀，尤其是在性别视阈下，以往文学作品中那些臆断的和面具下的人物得以真实呈现。
The schemes to avoid the subliminal channels are summarized and compared with each other . a conclusion is drawn that the subliminal channel introduced by the semantic randomness of the input harmless message of cryptosystem can not be completely avoided . a new scheme to generate elgamal - type signatures that are free of any subliminal channels introduced by its session key is designed 总结了封闭阈下信道的若干方法并对各方案优缺点进行了对比分析，给出了作为系统输入的无害消息的语义随机性不可能完全封闭的结论，设计了新的对elgamal类签名中会话密钥进行完全封闭的方案，讨论了现有封闭方案的实用性。
