Tight lower bound of consecutive lengths for QC-LDPC codes with girth at least ten

For an arbitrary (3,L) quasi-cyclic(QC) low-density parity-check (LDPC) code with girth at least ten, a tight lower bound of the consecutive lengths is presented. For an arbitrary length above the bound the corresponding LDPC code necessarily has a girth at least ten, and for the length equal to the bound, the resultant code inevitably has a girth smaller than ten. This new conclusion can be well applied to some important issues, such as the proofs of the existence of large girth QC-LDPC codes, the construction of large girth QC-LDPC codes based on the Chinese remainder theorem, as well as the construction of LDPC codes with the guaranteed error correction capability.     

依申请公开政府信息相关法律问题探析

依申请公开政府信息制度在运行中不应限制申请人的范围,外国人、外国法人或其他组织也应当根据国民待遇原则享有申请信息公开权利,只是在获取信息的方式和内容上加以限制,以保护我国的国家机密和商业秘密。申请人的理由也不应做严格限制,行政机关可以询问申请人的理由,但是无须进行认定。实践中,行政相对人滥用申请、多次连续申请、申请信息公开的收费方式以及行政机关的服务方式等是受理申请公开政府信息经常遇到的难题,须在解决问题的过程中对政府信息公开制度加以修订和完善。     

连续正整数立方和为素数方幂仅有唯一解

证明了连续正整数的立方和为素数或素数方幂仅有惟一解.     

四类圈树的连续边着色

设G是简单图，用颜色1，2，3，…对G进行正常边着色，若每一个顶点上表现的颜色都能构成一个连续的整数集合，则称这个边着色是连续的．图G的亏度def（G）等于粘在G上使它可连续边着色的悬挂边的最小数目．文章研究了四类圈树的亏度．     

几类图的连续边着色

设G是简单图，用颜色1，2，3，…，对G的正常边着色，如果每一个顶点上表现的颜色都构成一个连续的整数集合，那么就称这个边着色是连续的，图G的亏度def（G）是粘在G上使它可连续边着色的悬挂边的最小数目，对几类图的亏度进行了研究。     

整数线性规划的交集解法

给出ILP问题的交集解法,它是在单纯形法基础上引进一些新概念而形成的,实际上它是单纯形理论的发展。     

内扩散对连续反应选择性影响的计算机模拟

利用计算机编程绘制出内扩散对连续反应选择性的影响图。在低转化率下，中间产物B的收率与A的转化率呈线性关系；在高转化率下，中间产物B的收率有极大值。相同的φ值下，k1/k2值越大，内扩散影响越小；相同的k1/k2，φ值越大，内扩散影响越大，与实验事实完全一致。在连续反应中，可以方便地从图上求得宏观反应的选择性，并根据需要确定反应条件。     

运动目标最优角点选择算法*

针对传统角点提取算法应用于运动目标优质角点选取上,较难平衡检测精度和检测速率的问题,提出一种稳健的角点选择新算法。首先将图像分块,用子块在相邻帧间的灰度差对其进行聚类,并分割出运动区域块作为角点的搜索区域;然后引入邻域块重新构造Moravec算法的能量变化计算方法,并用之检测目标上的角点;最后对检测到的所有角点进行动态过滤,剔除掉质量低的角点,留下质量高的角点代表运动目标的局部显著特征。将本算法应用于目标跟踪系统进行测试,测试结果表明它有较好的稳健性,较强的的抗噪能力和较快的检测速度,且能保证跟踪的准确性,可以很好地满足交通场景中对行人检测实时性和可靠性的要求。     

A Target Tracking System for Applications in Hydraulic Engineering

A new type of digital video monitoring system (DVMS) named user defined target tracking system (UDTTS), was developed based on the digital image processing (DIP) technology and the practice demands of construction site management in hydraulic engineering. The position, speed, and track of moving targets such as humans and vehicles, which could be calculated by their locations at anytime in images basically, were required for management. The proposed algorithm, dependent on the context-sensitive moving information of image sequences which was much more than one or two images provided, compared the blobs’ properties in current frame to the trajectories of targets in the previous frames and then corresponded them. The processing frame rate is about 10fps with the image 240-by-120 pixels. Experimental results show that position, direction, and speed measurements have an accuracy level compatible with the manual work. The user-define process makes the UDTTS available to the public whenever appropriate.     

连续组合梁抗侧扭屈曲分析

钢-混凝土组合梁是一种优秀的结构形式,连续组合梁是常见的组合结构,它的负弯矩区段可能产生侧向失稳,从而降低承载力。文章通过计算分析,发现可以用支座负弯矩调幅和减小梁间距的办法,满足侧向稳定的要求。