Normal vector compression of 3D mesh model based on clustering and relative indexing

As the transmission of 3D shape models through Internet becomes more important, the compression issue of shape models gets more critical. While the compressions of topology and geometry have been explored significantly, the same issue for normal vectors has not yet been studied as much as it deserves.

Presented in this paper is an approach to compress the normal vectors of a 3D mesh model using the concept of clustering and relative indexing. The model is assumed to be manifold triangular mesh model with normal vectors associated with vertices. The proposed scheme clusters the normal vectors of given model and the representative normal vector of each cluster is referred to via a mixed use of relative as well as absolute indexing concepts. It turns out that the proposed approach achieves a significant compression ratio (less than 10% of the original VRML model files) without a serious sacrifice of the visual quality.     

Managing service level agreements in Premium IP networks: a business-oriented approach

This paper presents a market-enabling framework where users, content providers and network operators can interact in the seamless, transparent sale and delivery of a wide range of services. The framework allows for dynamic creation, configuration and delivery of services with quality assurance, via automated management of Service Level Agreements (SLAs). We propose an approach relying on a systemic treatment of business, service and network layer issues, which translates into a layered architecture where components belonging to different levels interact on the basis of a mediation paradigm. We use mediation as a generic term for a combination of negotiation, brokerage and state notification, jointly concurring to the realization of the entire life-cycle of a service.     

Optical CO2 sensor with the combination of colorimetric change of α-naphtholphthalein and internal reference fluorescent porphyrin dye

A new optical CO₂ sensor based on the overlay of the CO₂ induced absorbance change of pH indicator dye α-naphtholphthalein with the fluorescence of tetraphenylporphyrin (TPP) was developed. The observed luminescence intensity from TPP at 655 nm increased with increasing the CO₂ concentration. The ratio I₁₀₀/I₀ values of the sensing films consisting of α-naphtholphthalein in ethyl cellulose layer and TPP in polystyrene layer, where I₀ and I₁₀₀ represent the detected luminescence intensities from a layer exposed to 100% nitrogen and 100% CO₂, respectively, that the sensitivity of the sensor, are more than 53.9. The response and recovery times of the sensing films consisting of α-naphtholphthalein in ethyl cellulose layer and TPP in polystyrene layer were less than 5 s for switching from nitrogen to CO₂, and for switching from CO₂ to nitrogen. The signal changes were fully reversible and no hysterisis was observed during the measurements. The highly sensitive optical CO₂ sensor based on fluorescence intensity changes of TPP due to the absorption change of α-naphtholphthalein with CO₂ was achieved.     

竞技二打一游戏中同等牌力的研究

全国竞技二打一扑克锦标赛是国家体育总局棋牌运动管理中心推出的新兴项目，比赛采用复式赛赛制，然而这种赛制存在无法杜绝线上比赛作弊的问题，为此提出用同等牌力赛制来代替复式赛制进行比赛的设想。本文主要针对如何判定和选取具有同等牌力的初始手牌进行研究，提出用等级难度评估指标来计算初始手牌的难度，初始手牌难度相近的牌认定为同等牌力，并给出了同等牌力的选取方法；为保证一副牌所得等级难度评估指标的可靠性，提出用多个不同水平的“二打一AI程序”来代替真人打牌产生牌谱的方法。实验证明了同等牌力生成方法的有效性，本文提出的同等牌力方法应用于比赛是可行的。     

脱胶方法对棉秆皮纤维成分及结构的影响

对原棉秆皮不同部位进行化学成分分析,利用常温水沤、常压脱胶及高压脱胶对棉秆皮进行处理,对脱胶后棉秆皮进行化学成分分析．实验结果表明：高压脱胶后棉秆皮纤维中的半纤维素和木质素含量下降最为明显,纤维素含量提高．对不同方法处理后的棉秆皮纤维的长度、线密度进行测量,用SEM、FT-IR、XRD对处理后的棉秆皮纤维表面形态结构、聚集态结构进行了表征,同时对脱胶后的棉秆皮纤维进行强伸性能等测试并得出断裂曲线．     

培养条件对Streptococcus equisimilis合成透明质酸相对分子质量的影响

作者比较了不同培养条件对Streptococcus equisimilis合成透明质酸相对分子质量的影响。结果表明:高质量浓度葡萄糖有利于长链透明质酸的合成,当发酵体系葡萄糖初始质量浓度从20g/L上升至80g/L,相对分子质量从1.24×106增大到2.02×106,提高了62.9%。葡萄糖补料培养不利于高相对分子质量透明质酸的合成,利用葡萄糖间歇和连续补料培养的方式得到透明质酸相对分子质量分别为1.53×106和1.42×106,比分批培养下降了19.9%和25.7%。在33~39℃范围内,较低温度有利于高相对分子质量透明质酸的合成,在33℃培养条件下透明质酸相对分子质量最高可达2.54×106。发酵液p H显著影响透明质酸的相对分子质量,在p H8时,达到了最高的2.38×106。较高溶氧水平有利于高相对分子质量透明质酸的合成,在0~45%溶氧浓度范围内,相对分子质量随溶氧水平的增加从1.16×106提升至2.43×106,增长了109.4%。本研究结果为后续高相对分子质量透明质酸的生产提供有用的实验依据。     

粘胶基碳纤维连续式电化学氧化表面处理（1）：碳纤维表面的物理 …

本文报道了用连续式电化学氧化表面处理粘胶基碳纤维表面,并测定了处理后碳纤维的单丝强度,表面浸润性,表面活性官能团含量及表面形貌等表面物理化学性能。结果表明：粘胶基碳纤维经电化学氧化表面处理可以有效地在表面主生活性官能团和提高表面粗糙度,从而有效地提高表面润湿性,但经处理后单丝强度较易下降,因此需精确控制处理的条件。     

一种高压室消防机器人

通过对消防机器人的功能和组成模块分析,确定消防机器人的结构形式。介绍了消防机器人的结构,并据此结构,对消防机器人的狭窄区域通过性能、稳定性和抗倾覆性能进行分析,所设计的机器人能够完成预定作业任务。最后,通过观察窗破拆、灭火操作和狭窄区域通过实验,进一步验证高压室消防机器人的性能,能够有效完成破拆和灭火作业。