符号约束（Sign Restrictions）：为了完成线性规划问题建模，必须回答有关每个决策变 量的问题：是否决策变量只能取非负值，或者决策变量既可以取正值又可以取负...
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A new error-correcting scheme based on symbol-constrained joint source-channel decoding is presented for VLCs with double-tree construction.
为此,论文提出了一种基于双树构造的不等长编码信源的符号约束联合译码纠错方案。
参考来源 - 卷积码和Turbo码的联合信源信道译码·2,447,543篇论文数据，部分数据来源于NoteExpress
布朗尼和菠萝芝士蛋糕都有一个临界值，因为它们的值受到了符号约束的限制。
The brownie and pineapple cheesecake have a marginal value, because their value is at the limit of their sign constraints.
UML 2已经通过去掉“in - line”约束，增加一个叫做组合碎片的符号元件，解决了这一个问题。
UML 2 has addressed this problem by removing the "in-line" guard and adding a notation element called a Combined Fragment.
此方案在推理过程中运用了约束传播和符号代数的方法，预测所有可能合理的配置信息。
The basic idea in this approach is to predict all reasonable spatial configurations of a mechanism using constrain spread and sign algebra.
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