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在二进制输入加性高斯白噪声信道下,研究了基于多边缘型低密度奇偶校验码(Multi-edge Low Density Parity Check,MET-LDPC)的密度进化算法。针对高斯近似算法在前期迭代中的不准确问题,提出了一种改进算法。在分析MET-LDPC码的密度进化的基础上,将全密度进化与高斯近似算法结合,通过设置切换限制条件,弥补早期迭代的不准确,提高编码阈值估计的准确性。仿真结果表明,与MET-LDPC全密度进化算法相比,所提算法可以有效提高编码阈值估计的准确性,对LDPC编码的设计有一定的参考价值。 相似文献
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为进一步提升中短码长下准循环低密度奇偶校验(Quasi-cyclic Low-density Parity-check,QC-LDPC) 码的纠错性能,提出了一种综合短环数目和环连通性的QC-LDPC码构造方法。首先,采用Golomb规则构造QC-LDPC码,对基矩阵中的部分元素进行替换预处理,初步降低短环数目;其次,采用所提的利用近似环外信息度(Approximate Cycle Extrinsic message degree,ACE)的消环掩模算法来优化QC-LDPC码,使得掩模后的校验矩阵具有较大的ACE平均值,最终完成QC-LDPC码的构造。该构造方法简单、通用性强,在短环数目和连通性间进行了平衡。与只考虑减少短环数目、增大围长等方法相比,该方法构造的QC-LDPC码有更加优异的纠错性能。 相似文献
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This research applies the impression management theory of exemplification in an accounting study by identifying and measuring
differences in both auditor and public perceptions of exemplary behaviors. The auditors were divided into two groups, one
of which reported self-perceptions (A-S) while the other group reported their perceptions of a typical auditor (A-O). There
were two separate public groups, which gave their perceptions of a typical auditor and were divided based on their levels
of accounting sophistication. The more sophisticated public group was comprised of bank loan officers (LO) while the less
sophisticated public group consisted of investment club members (IC). Comparisons were made on 30 behaviors contained in the
AICPA Code of Professional Conduct, which served as the basis for the research instrument. Profile analysis, a special form of MANOVA technique, was used to
analyze the results. A-S perceptions were the highest of the four treatment levels and were significantly higher (i.e., more
exemplary) than the perceptions of both the A-O and LO groups. The more sophisticated user group (LO) provided the lowest
perceptions of the four treatment levels. For at least four of the six measures, the LO treatment group perceived the typical
auditor to be less exemplary than both the IC and A-O treatments. There were no differences in perceptions between the A-O
group and IC. Additional analysis revealed that auditors overrated the degree to which the public relied on financial statements.
However, both public groups reported a reasonably high level of reliance on financial statements when making decisions.
Philip A. Brown is an Associate Professor and Directtor of the Accounting Program at Harding University in Searcy, Arkansas.
He has a bachelor's degree from Harding University, an MBA from West Virginia University and a Ph.D. from the University of
Mississippi. His research interests are in accounting ethics and in accounting education. He has published in Advances in Accounting, The Journal of Accounting and Finance Research, and others. He is a CPA in the State of Arkansas.
Morris H. Stocks serves as the Dean of the Patterson School of Accountancy at the Universtiy of Mississippi. He received his
undergraduate degree in accounting from Trevecca Nazarene University, his Masters degree from Middle Tennessee State University
and his Ph.D. from the University of South Carolina. He is a Certified Public Accountant in the State of Mississippi. He is
a behavioral accounting researcher and has published in Accounting, Organizations and Society, Accounting Horizons, Behavioural Research in Accounting, Decision Sciences Journal,
Advances in Accounting, Advances in Accounting Information Systems, Advances in Behavioral Accounting Research, Accounting,
Auditing and Accountability Journal, Advances in Taxation and others.
W. Mark Wilder is KPMG Lecturer and Associate Professor of Accountancy at The University of Mississippi. His educational background
includes a bachelor's degree in mathematics from The University of Alabama, an MBA from the University of South Alabama, and
a Ph.D. in Accounting from Florida State University. He is a CPA in the State of Mississippi. Mark has published in Accounting Horizons, Advances in Taxation, the Journal of Applied Corporate Finance, the Journal of Computer and Information
Systems, the CPA Journal, and others. In the past 2 years he has received several awards, including the top two campus-wide faculty awards at Ole
Miss and also the MSCPA Outstanding Educator Award. In 2004 he was inducted into the Alabama Tennis Hall of Fame. 相似文献
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我国加入WTO以后,对于上海的发展是一个千栽难逢的机遇,同时也给上海的发展带来新的挑战。本文通过详实的资料分析了上海经济发展的现状和制约上海进一步发展的问题,并运用市场营销新理论,提出构建上海现代化大都市的营销战略。 相似文献
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