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arXiv 1503.03597cs.ITmath.IT
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缺陷随机集的非适应性成组检验

Nonadaptive group testing with random set of defectives

Arya Mazumdar

摘要:

在分组测试方案中,设计一组测试以识别在大量$N$项目中存在的少量$t$缺陷项目。每个测试将一组项目作为输入,并产生一个二进制输出,指示该组中是否存在任何缺陷项目。在非自适应方案中,设计测试方案等价于构造一个析取矩阵,一个$M \times N$二进制矩阵,其中任何$t$列的支集的并集不包含任何其他列的支集。在本文中,我们考虑的情况下,有缺陷的项目是随机的,并遵循简单的概率分布。特别地,我们考虑的情况下,1)每个项目可以是有缺陷的概率独立$\frac{t}{N}$和2)每个$t$ -集的项目可以是有缺陷的概率均匀。在这两种情况下,我们的目标是设计一个测试矩阵,成功地识别出一组具有高概率的缺陷。这两种模型在文献中已经研究过,并且已知$O(t\log N)$测试在这两种情况下都是必要的并且是充分的(通过随机编码)。我们的主要重点是明确的确定性建设的测试矩阵服从上述情况。构造测试矩阵的最流行的方法之一依赖于\emph{constant-weight error-correcting codes}和它们的最小距离。我们超越了最小距离分析,并将等重代码的平均距离与所得测试矩阵的参数联系起来。随着我们放松的要求,我们表明,使用显式等重码(例如,基于代数几何代码),我们可以对第一种和第二种情况都实现等于$O(t \frac{\log^2 N}{ \log t})$的多个测试。

英文摘要:

In a group testing scheme, a set of tests is designed to identify a small number $t$ of defective items that are present among a large number $N$ of items. Each test takes as input a group of items and produces a binary output indicating whether any defective item is present in the group. In a non-adaptive scheme designing a testing scheme is equivalent to the construction of a disjunct matrix, an $M \times N$ binary matrix where the union of supports of any $t$ columns does not contain the support of any other column. In this paper we consider the scenario where defective items are random and follow simple probability distributions. In particular we consider the cases where 1) each item can be defective independently with probability $\frac{t}{N}$ and 2) each $t$-set of items can be defective with uniform probability. In both cases our aim is to design a testing matrix that successfully identifies the set of defectives with high probability. Both of these models have been studied in the literature before and it is known that $O(t\log N)$ tests are necessary as well as sufficient (via random coding) in both cases. Our main focus is explicit deterministic construction of the test matrices amenable to above scenarios. One of the most popular ways of constructing test matrices relies on \emph{constant-weight error-correcting codes} and their minimum distance. We go beyond the minimum distance analysis and connect the average distance of a constant weight code to the parameters of the resulting test matrix. With our relaxed requirements, we show that using explicit constant-weight codes (e.g., based on algebraic geometry codes) we may achieve a number of tests equal to $O(t \frac{\log^2 N}{ \log t})$ for both the first and the second cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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