A channel distortion model for video over lossy packet networks

Error-resilient video communication over lossy packet networks is often designed and operated based on models for the effect of losses on the reconstructed video quality. This paper analyzes the channel distortion for video over lossy packet networks and proposes a new model that, compared to previous models, more accurately estimates the expected mean-squared error distortion for different packet loss patterns by accounting for inter-frame error propagation and the correlation between error frames. The accuracy of the proposed model is validated with JVT/H.264 encoded standard test sequences and previous frame concealment, where the proposed model provides an obvious accuracy gain over previous models.     

Effects of environmental intervention on sedentary time,musculoskeletal comfort and work ability in office workers

Sit–stand workstations offer a potential strategy to reduce prolonged occupational sitting. This controlled intervention study examined the effects of an environmental intervention on occupational sedentary time, musculoskeletal comfort and work ability, and the usability of sit–stand workstations in office work via a self-reported questionnaire. The intervention group (n?=?24) used sit–stand workstations during the 6-month intervention period, and the control group (n?=?21) used traditional sitting workstations. The results showed that working at sit–stand workstations can reduce sitting time significantly compared to control workstations (?6.7% vs. 5.0%, p?=?.019), which is reallocated mostly to standing (r?=??0.719, p?p?=?.028), as well as work ability (p?=?.022). The majority of intervention subjects rated sit–stand workstation adjustability as good (83.3%), and 75.0% were satisfied with the workstation. About 41.7% of the intervention participants, who were exclusively female, used the sit–stand function on a daily basis. While the environmental change alone was effective, it is likely that promoting the daily use of sit–stand workstations with counselling would lead to even more substantial positive effects.     

关于现行监理制实施的探讨

针对工程建设监理实施中存在的问题,提出当前监理工作的对策和工作模式.     

氢化丁腈橡胶的应用与研究进展

本文评述了氢化丁腈橡胶（HNBR）的应用及进展，指出了我国发展氢化丁睛橡胶的潜力。     

健全我国社会保障制度的对策

健全我国社会保障制度可实施完善社会保障管理体制,实行资金统一管理;推行积极的就业政策,扩大就业规模;建立新的劳动力管理体制,完善就业服务体系;加强培训信息和劳动力需求信息相互沟通;对我国低收入者实行负所得税制度,提高低收入者的收入水平;完善养老保险制度,采取对策缓解养老保险基金的支付压力;完善社会保障资金筹措机制;加强和完善机构内部控制、行政监督和社会监督相结合的社会保障基金监管体系等对策。     

寓素质教育于计算机基础课程教学中

本文结合教学实际 ,探索在计算机课程教学中如何加强素质教育的问题 ,提出一些加强素质教育的新思路 .     

Study on pig growth hormone gene polymorphisms in western meat-type breeds and Chinese local breeds

Chinese Meishan and Jiangquhai pigs are two of the most prolific pigs in the world, but their growth rate is lower than that of Duroc, Landrace and Pietrain pigs. It is suggested that growth rate is regulated by growth hormone. The objective of the current study was to analyze the porcine growth hormone (pGH) gene polymorphisms based on the polymerase chain reaction restriction fragment-length polymorphism method (PCR-RFLP) for three western meat-type breeds (Duroc, Landrace and Pietrain) and two local Chinese pigs (Meishan and Jiangquhai). Five polymorphic restriction sites were detected with the ApaI, MspI, BspI and HhaI restriction enzymes in two amplified fragments (605 bp, -119 to +486; 506 bp, +206 to +711). Breed difference was found only in the 506 bp fragment. There was no difference in allelic frequencies of BspI and HhaI restriction sites among the five breeds (P>0.05). Landrace and Meishan pigs lacked allele G3 of MspI site. The allele G3 frequency of restriction MspI site of the 506 bp fragment in Pietrain pigs was higher than that in Duroc and Jianquhai pigs (P<0.001). For ApaI site, the Meishan pigs lacked allele G1; no difference was found in allelic frequencies among Pietrain, Duroc, Landrace and Jiangquhai pigs (P>0.05). This new and rapid PCR-RFLP typing method is an attractive tool for analysis of porcine growth hormone gene restriction sites. The differences in MspI and ApaI restriction sites may explain the growth difference between the foreign meat-type breeds above mentioned and local Chinese pigs.     

金融控股--我国金融业参与全球竞争的战略选择

作为WTO成员国，中国在对外金融开放的过程中，如何兴利除弊、加强国家金融主权的控制，是一个需要关注的战略问题。组建并进一步完善现有金融控股公司，充分发挥金融控股公司的协同效应，是金融业提高综合竞争能力的必然要求。     

教育:全球化、本土化与本土生长——从比较教育学的角度观照

民族主义和世界主义是比较教育学研究中的一对观念上的基本矛盾 ,在全球化的后殖民时代背景下 ,这对矛盾又有新的表现。本土化无法成为弱势文化有效的解殖出路 ,在“和”的模式中寻求多元发展 ,第三世界的教育和文化才有可能在本土生长中逐步解殖     

统一的教育观

“中庸之道”最早的统一观,来自于对天体的观察。21世纪急需具备“统一”思维能力的人才已成为全世界科学家的共识。统一用脑可达思维能力最大化。统一观的教学实践,艺术的教育与教育的艺术,自我完善,创造力培养,统一的教育可达教育最大化。