水印嵌入之前进行随机置换与LDPC编码增强了水印抗攻击能力。
Watermarks are stochastically permuted and coded by LDPC to improve the robustness against attacks.
结果表明，在所用分组密码是伪随机置换的条件下，方案在分块适应性攻击模型下是可证明安全的。
Investigation shows that the scheme is provable security under the blockwise adaptive attack model if the underlying block cipher is a pseudorandom permutation.
水印信息经随机置换与LDPC编码，对经过二次整数变换之后的直流分量进行修改实现水印的嵌入。
The watermarking information that is stochastically permuted and coded by LDPC is embedded in the modified DC components which are attained by integer transform twice.
方法：自1996年1月以来，在316例心脏瓣膜置换病人中，随机选择200例应用立止血。
METHODS:Since January 1996,316 patients have undergone cardiac valve replacement, of them, 200 patients were randomly selected to receive reptilase during operations.
方法采用描述性研究方法，随机抽样72例髋关节置换患者进行问卷调查，了解患者对健康教育的需求。
Methods This descriptive study included 72 randomly sampled patients undergoing hip replacement to investigate their needs for health education.
随机取样后1年，30.7%的已经接受经皮瓣膜置换的患者死亡，相比较而言，50.7%的接受标准内科治疗的患者死亡。
At one year after randomization, 30.7 percent of patients who had received the percutaneous valve replacement had died compared with 50.7 percent of those who received standard medical therapy.
首先由随机函数生成得到任意的不相等的混沌序列，以此序列作镜像变换后对信息进行置换而得到加密文件。
A random unlikeness chaotic sequence is created with random function. Mirror image transforms with this chaotic sequence, then the information is transformed to secret-code files by this sequence.
目前还没有适当的随机试验可以确定血浆置换是不是改善了重症肌无力病患短期或长期的预后。
No adequate RCTs have been performed to determine whether plasma exchange improves the short - or long-term outcome for chronic myasthenia gravis or myasthenia gravis exacerbation.
全膝关节置换术的随机对照试验。
目前仍没有临床随机试验的证据可以确定血浆置换是否能改善重症肌无力病患的预后。
No adequate RCTs have been performed to determine whether plasma exchange improves the short - or long-term outcome for chronic myasthenia gravis or myasthenia gravis exacerbation.
方法将70全髋关节置换术患者随机分为干预组和对照组。
Methods 70 patients with total hip arthroplasty were randomly divided into intervention and control groups.
方法将70全髋关节置换术患者随机分为干预组和对照组。
Methods 70 patients with total hip arthroplasty were randomly divided into intervention and control groups.
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