Research on secure buyer-seller watermarking protocol

A new buyer-seller watermarking protocol is proposed by applying a double encryption method and a novel mechanism of embedding a buyer＇s watermark. The protocol can effectively prevent against collusion attacks and the man in the middle attack if the third party is not trusted. Also, based on the proposed scheme for the first-hand transaction, a new buyer-reseller watermarking protocol and a formal multi-party watermarking protocol are also proposed. The proposed buyer-resell watermarking protocol only needs the original seller to provide transfer certificate and encryption-decryption service to support the second-hand transaction, and the multi-party watermarking protocol with distributed certificate authorities can overcome the difficulty in the combination of multicast mechanism with multiple unique watermarks and allow a seller to multicast the watermarked digital contents and key transaction information to n buyers. Furthermore, the idea of zero knowledge proof is also applied into the proposed scheme to allow the seller to take an effective control on the task performed by the third party.     

在体育课中如何创设好的情感环境和培养学生的自信心

体育有别于其他学科的显著特点是直观性相当强，师生共同活动，教与练的密切配合贯穿于整个课堂。体育课中有一个好的情感环境，就能使学生的注意力集中，有兴趣，精神振奋，这对提高课的质量，显得十分重要。自信心就像催化荆能将人的一切潜能调动起来，使人们百折不挠，不断努力，最终获得成功。     

基于概率模型下施惠同恒等式的证明

对较为重要的组合恒等式—施惠同恒等式,本文构造了一个古典概型,用概率方法非常简捷地完成了施惠同恒等式的证明.     

命题逻辑与数学证明方法（Ⅲ）

简单地讨论了命题逻辑,用命题逻辑全面地研究了推理格式和数学证明方法,形成一个完整的系统.内容包括反证法推理格式、反证法、数学证明方法总结.     

曹操墓纠纷的理性思考——论我国考古论证制度的缺失和完善

曹操墓惊现河南安阳后,质疑纷起。＂挺曹派＂言之凿凿;＂反曹派＂学者认为证据不足,定性为时过早;公众质疑矛头直指政府和学术权威的公信力。各方法理辩论的背后折射出我国考古论证制度的不完善。     

2m次根方案在同步攻击下的安全性证明

证明了在分解整数困难的前提下，2^m次根方案在同步攻击下是安全的.     

抗爆设计中材料极限塑性应变的一种确定方法

为了确定抗爆设计中材料的最大许用塑性应变值,以单向受拉的矩形薄板为研究对象,假定板宽和厚度方向的变形相等,利用塑性变形的体积不变理论,通过等效应变的思想,提出了一种以延伸率为基本变量的材料合理许用应变值的确定方法·利用ANSYS软件对纯铝圆板在周边全约束、承受均布爆炸模拟载荷作用下的破坏变形进行了有限元数值模拟计算,当计算得到的板内最大等效应变接近本文提出的极限塑性应变值时,计算得到的圆板相应破坏位移与Pilkington实验数据基本一致     

Pragmatic Holism (or pragmatic reductionism)

The reductionist/holist debate is highly polarised. I propose an intermediate position of pragmatic holism. It derives from two claims: firstly, that irrespective of whether all natural systems are theoretically reducible, for many systems it is utterly impractical to attempt such a reduction, and secondly, that regardless of whether irreducible 'wholes exist, it is vain to try and prove this. This position illuminates the debate along new pragmatic lines by refocussing attention on the underlying heuristics of learning about the natural world.     

质疑“证据之王”

证据证明力的大小是刑事诉讼中一个最敏感的话题。通过对几种所谓“证据之王”的比较分析,不难看出任何证据的证明力都是相对的,片面强调和相信所谓证据之王必将犯形而上学的错误,并违背“以事实为依据,以法律为准绳”的法制总原则,在司法实践中会造成不可估量的损失。     

试析刑事证明标准理论之法律真实说

我国学者们缘于对1996年修改的《中华人民共和国刑事诉讼法》第162条所确立的“疑罪从无”原则的讨论,将“法律真实”引入刑事证明标准理论,法律真实说驳斥客观真实说曲解唯物主义认识论,对客观真实说的缺陷作了切中要害、准确而深入的分析,因而,在与客观真实说的论战中逐步获得来越多的支持。然而,法律真实说由于其理论上的不彻底性,也使其自身存在着不可克服的内在矛盾。