After describing the characteristics of programming paradigm, this paper introduces the approach of code component composition reuse in detail, proposes and discusses viewpoint that code component composition reuse is...After describing the characteristics of programming paradigm, this paper introduces the approach of code component composition reuse in detail, proposes and discusses viewpoint that code component composition reuse is a kind of new programming paradigm. This paper also specifies the characteristics of this new programming paradigm in detail, and points out some issues that must be resolved for using this new programming paradigm.展开更多
In order to make most software engineers and managers pay more attention to software quality at source level, two confusing terms-coding standard and programming style-were reviewed and compared. An evolutionary model...In order to make most software engineers and managers pay more attention to software quality at source level, two confusing terms-coding standard and programming style-were reviewed and compared. An evolutionary model of quality assurance at source code level was proposed, which implies that coding standard should be better accepted and more emphasized than programming style. Our current researches on evaluating the compliance with coding standards will likely make the strategy of quality assurance at source code level more operable.展开更多
The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of...The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of data by homomorphic hash function,and then it compares the hash value with the receiving message digest.Because the feedback channel is deliberately removed during the distribution process,the rateless codes are often vulnerable when they face security issues such as packets contamination or attack.This method prevents contaminating or attack on rateless codes and reduces the potential risks of decoding failure.Compared with the SHA1 and MD5,HHA,which has a much shorter message digest,will deliver more data.The simulation results show that to transmit and verify the same amount of OAP data,HHA method sends 17.9% to 23.1%fewer packets than MD5 and SHA1 under different packet loss rates.展开更多
为探索出适用于一流本科课程教学的实践方式,文章针对"微机原理"实验课程,提出基于Visual Studio Code的实验教学模式。新模式弥补了传统实验教学的不足,能有效增强学生编写代码的兴趣,满足个性化需求,提高编程效率,提升教学...为探索出适用于一流本科课程教学的实践方式,文章针对"微机原理"实验课程,提出基于Visual Studio Code的实验教学模式。新模式弥补了传统实验教学的不足,能有效增强学生编写代码的兴趣,满足个性化需求,提高编程效率,提升教学质量。文章从实验项目安排、编程软件安装和实验操作等方面多角度介绍新模式对实验教学的支撑作用,为软件编程方面的实验教学工作提供新思路,进一步推进先进信息技术与实验教学的深度融合。展开更多
近几年来二维条形码已成为最流行的技术之一，而 QR Code 又是其中应用最广泛的一种码型。然而，目前针对 QR Code 的应用大多使用的是承载信息量不太多的中低版本，而级别20以上的承载信息量较多的 QR Code 的研究和应用却很少见。笔...近几年来二维条形码已成为最流行的技术之一，而 QR Code 又是其中应用最广泛的一种码型。然而，目前针对 QR Code 的应用大多使用的是承载信息量不太多的中低版本，而级别20以上的承载信息量较多的 QR Code 的研究和应用却很少见。笔者针对程序设计语言及算法课程的教学，提出使用高版本 QR Code 图像对一定字符量的程序和算法代码进行编码存储并印刷在讲义或教材上，使学生在学习过程中可以使用智能手机拍摄和解析出 QR Code 图像中的算法代码，再以专用的代码展示和编辑软件进行彩色、高亮和结构化的演示，并可在浏览器中运行以查看动态的运行过程和结果。这种方式较传统的教材模式给学生学习带来了极大的方便，动态的运行也极大地提高了学习效率，增强了学习效果。展开更多
Decoding by alternating direction method of multipliers(ADMM) is a promising linear programming decoder for low-density parity-check(LDPC) codes. In this paper, we propose a two-step scheme to lower the error floor of...Decoding by alternating direction method of multipliers(ADMM) is a promising linear programming decoder for low-density parity-check(LDPC) codes. In this paper, we propose a two-step scheme to lower the error floor of LDPC codes with ADMM penalized decoder.For the undetected errors that cannot be avoided at the decoder side, we modify the code structure slightly to eliminate low-weight code words. For the detected errors induced by small error-prone structures, we propose a post-processing method for the ADMM penalized decoder. Simulation results show that the error floor can be reduced significantly over three illustrated LDPC codes by the proposed two-step scheme.展开更多
文摘After describing the characteristics of programming paradigm, this paper introduces the approach of code component composition reuse in detail, proposes and discusses viewpoint that code component composition reuse is a kind of new programming paradigm. This paper also specifies the characteristics of this new programming paradigm in detail, and points out some issues that must be resolved for using this new programming paradigm.
文摘In order to make most software engineers and managers pay more attention to software quality at source level, two confusing terms-coding standard and programming style-were reviewed and compared. An evolutionary model of quality assurance at source code level was proposed, which implies that coding standard should be better accepted and more emphasized than programming style. Our current researches on evaluating the compliance with coding standards will likely make the strategy of quality assurance at source code level more operable.
基金Supported by the National Science and Technology Support Program(Y2140161A5)the National High Technology Research and Development Program of China(863Program)(O812041A04)
文摘The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of data by homomorphic hash function,and then it compares the hash value with the receiving message digest.Because the feedback channel is deliberately removed during the distribution process,the rateless codes are often vulnerable when they face security issues such as packets contamination or attack.This method prevents contaminating or attack on rateless codes and reduces the potential risks of decoding failure.Compared with the SHA1 and MD5,HHA,which has a much shorter message digest,will deliver more data.The simulation results show that to transmit and verify the same amount of OAP data,HHA method sends 17.9% to 23.1%fewer packets than MD5 and SHA1 under different packet loss rates.
文摘为探索出适用于一流本科课程教学的实践方式,文章针对"微机原理"实验课程,提出基于Visual Studio Code的实验教学模式。新模式弥补了传统实验教学的不足,能有效增强学生编写代码的兴趣,满足个性化需求,提高编程效率,提升教学质量。文章从实验项目安排、编程软件安装和实验操作等方面多角度介绍新模式对实验教学的支撑作用,为软件编程方面的实验教学工作提供新思路,进一步推进先进信息技术与实验教学的深度融合。
文摘近几年来二维条形码已成为最流行的技术之一，而 QR Code 又是其中应用最广泛的一种码型。然而，目前针对 QR Code 的应用大多使用的是承载信息量不太多的中低版本，而级别20以上的承载信息量较多的 QR Code 的研究和应用却很少见。笔者针对程序设计语言及算法课程的教学，提出使用高版本 QR Code 图像对一定字符量的程序和算法代码进行编码存储并印刷在讲义或教材上，使学生在学习过程中可以使用智能手机拍摄和解析出 QR Code 图像中的算法代码，再以专用的代码展示和编辑软件进行彩色、高亮和结构化的演示，并可在浏览器中运行以查看动态的运行过程和结果。这种方式较传统的教材模式给学生学习带来了极大的方便，动态的运行也极大地提高了学习效率，增强了学习效果。
基金supported in part by National Nature Science Foundation of China under Grant No.61471286,No.61271004the Fundamental Research Funds for the Central Universitiesthe open research fund of Key Laboratory of Information Coding and Transmission,Southwest Jiaotong University(No.2010-03)
文摘Decoding by alternating direction method of multipliers(ADMM) is a promising linear programming decoder for low-density parity-check(LDPC) codes. In this paper, we propose a two-step scheme to lower the error floor of LDPC codes with ADMM penalized decoder.For the undetected errors that cannot be avoided at the decoder side, we modify the code structure slightly to eliminate low-weight code words. For the detected errors induced by small error-prone structures, we propose a post-processing method for the ADMM penalized decoder. Simulation results show that the error floor can be reduced significantly over three illustrated LDPC codes by the proposed two-step scheme.
