铁路应急通信系统视频流卡顿问题分析

针对某铁路局应急通信系统转发视频流至国铁集团应急通信系统时出现视频卡顿的问题,利用数据网业务质量智能感知系统对应急通信视频业务进行监控分析,确定视频卡顿原因,提出采用RTP+实时传输控制协议(Real-Time Control Protocol,RTCP)传输UDP数据包以保证视频流数据传输可靠有序的解决方案。

《1618年耶稣会中国年信》译注并序(上)

17世纪耶稣会中国年信是研究中国天主教史和明清史的重要史料,但至今没有一份年信有完整的中译本。作为系统翻译17世纪耶稣会中国年信计划的一部分,我们首先将颇具代表性的《1618年耶稣会中国年信》翻译成中文并公开发表。为了更好地展现该年信的学术价值,我们对年信中的一些内容做了初步考证,以脚注形式标出,以利于中外学者使用。

民国时期徽商的境遇——以《民国二十三年三月黟县颖生立来往信录》为中心

《民国二十三年三月黟县颖生立来往信录》是民国时期黟县徽商之间的来往信札,共有104封。信中有大量关于徽州商人经商艰难的信息,主要包括两个方面:一是资金短缺,而资金短缺主要是由于中日战争时期,商业萧条导致收入少,一人养众口和治病致使支出大;另一个因素是突发的飞来横祸给商业带来致命性打击,即抢劫和强制征兵。从中可以看出徽商所面临的困境。

文艺青年必用，写信给一年后的自己

猫的天空之城也许是文艺青年最爱的地方之一，那儿不仅有书有咖啡，最戳人心的还是那颗被你遗忘的时间胶囊——一封寄给未来自己的信。不久前，这个创意也来到了App的世赛，它叫《一年之信》，这款Appu可以设定在写信件的一年后发出，如果你有什么想对未来自己说的话，想对爱人、家人和朋友表达内心，可以试试这款文艺范的软件。

工信部下达2014年淘汰落后产能任务电石淘汰170万t

近期工业和信息化部向各地下达了2014年淘汰落后和过剩产能任务。具体为:炼铁1900万t、炼钢2870万t、焦炭1200万t、铁合金234.3万t、电石170万t、电解铝42万t、铜(含再生铜)冶炼51.2万t、铅(含再生铅)冶炼11.5万t、水泥(熟料及磨机)5050万t、平板玻璃3500万重量箱、造纸265万t、制革360万标张、印染10.84亿m、化纤3万t、铅蓄电池(极板及组装)2360万kvah、稀土(氧化物)10.24万t。

基于城轨车辆升级扩容的信号系统方案研究

描述典型CBTC系统,从车辆扩容的角度分析信号系统的各个子系统的影响和设计方案,对项目初期的信号系统设计提出建议;结合项目实际情况,明确车辆升级扩容后会影响信号系统设计的车辆参数,结合车辆参数进行信号系统方案的研究,同时从信号系统的角度提出对车辆尺寸、设备安装位置、牵引制动特性、接口总线等各个设计的需求,评估信号系统可接受的车辆参数,为车辆方的车辆设计及信号系统的技术方案提供设计参考。

计算机联锁形式化验证典型反例分析

形式化验证是确保计算机联锁系统满足特定安全需求的有效且重要的手段。由于形式化方法的特殊性,要求对于系统模型和安全需求模型的描述完全准确,否则均会导致验证不通过。根据计算机联锁形式化验证的实际经验,总结在安全需求模型建立过程中由于模型建立不完善导致验证失败的典型场景,为形式化验证的实践提供参考。

关于新软件企业认定和年审条件的解析

在国发〔2011〕4号文指引下,财税〔2012〕27号文和工信部联软〔2013〕64号文相继出台,在扶优扶强的原则下,明确了新的认定软件企业和年审的条件。本文将新的认定和年审条件与原信部联产〔2000〕968号文的规定进行了比对,总结了新的软件企业认定和年审规定在条件上有了较大提高,申报材料上有所增加,并明确提出了审计的要求三项显著变化,为企业在实际操作过程中提供参考。

资产阶级社会中的资本奴役关系透视

在马克思的眼中,人类社会独有的社会关系场境存在,正是物质存在的一种特殊方式,一定历史条件下的社会生活中出现的观念和范畴都必然与特定时间中的物质生产关系赋型相关联。并且,他将这一物质关系进一步指向在经济的社会形式中出现的经济关系。资产阶级经济学家将资产阶级的历史时间中的生产关系伪饰成天然的、永恒不变的自然规律,是资产阶级意识形态对资产阶级生产方式历史性的一种本质遮蔽。

Demand analysis of an intelligent medication administration system for older adults with chronic diseases based on the Kano model

Objectives Gerontechnology has great potential in promoting older adults’well-being.With the accelerated aging process,gerontechnology has a promising market prospect.However,most technological developers and healthcare professionals attached importance to products’effectiveness,and ignored older adults’demands and user experience,which reduced older adults'adoption intention of gerontechnology use.The inclusion of older adults in the design process of technologies is essential to maximize the effect.This study explored older adults’demands for a self-developed intelligent medication administration system and proposed optimization schemes,thus providing reference to developing geriatric-friendly technologies and products.Methods A cross-sectional survey was conducted to explore older adults’technological demands for the self-developed intelligent medication administration system,and data were analyzed based on the Kano model.A self-made questionnaire was administered from July 2020 to October 2020 after participants used this system for two weeks.The study was registered with the Chinese Clinical Trial Registry(ChiCTR2000040644).Results A total of 354 older adults participated in the survey.Four items,namely larger font size,simpler operation process,scheduled medication reminders and reliable hardware,were classified as must-be attributes;three items,namely searching drug instructions through WeChat,more sensitive system and longer battery life,as attractive attributes;one item,viewing disease-related information through WeChat,as the one-dimensional attribute;and the rest were indifferent attributes,including simple and beautiful displays,blocking advertisements automatically,providing user privacy protection protocol,viewing personal medical information only by logged-in users,recording all the medications,ordering medications through WeChat.The satisfaction values were between 0.24 and 0.69,and dissatisfaction values were between 0.06 and 0.94.Conclusion This study suggested that older adults had personalized technology demands.Including their technological demands and desire may assist in decreasing the digital divide and promoting the satisfaction of e-health and/or m-health.Based on older adults’demands,our study proposed optimization schemes of the intelligent medication administration system,which may help developers design geriatric-friendly intelligent products and nurses to perform older adults-centered and efficient medication management.

Transition clinic attendance is associated with improved beliefs and attitudes toward medicine in patients with inflammatory bowel disease

To evaluated the differences in knowledge, adherence, attitudes, and beliefs about medicine in adolescents with inflammatory bowel disease (IBD) attending transition clinics. METHODSWe prospectively enrolled patients from July 2012 to June 2013. All adolescents who attended a tertiary-centre-based dedicated IBD transition clinic were invited to participate. Adolescent controls were recruited from university-affiliated gastroenterology offices. Participants completed questionnaires about their disease and reported adherence to prescribed therapy. Beliefs in Medicine Questionnaire was used to evaluate patients’ attitudes and beliefs. Beliefs of medication overuse, harm, necessity and concerns were rated on a Likert scale. Based on necessity and concern ratings, attitudes were then characterized as accepting, ambivalent, skeptical and indifferent. RESULTSOne hundred and twelve adolescents were included and 59 attended transition clinics. Self-reported adherence rates were poor, with only 67.4% and 56.8% of patients on any IBD medication were adherent in the transition and control groups, respectively. Adolescents in the transition cohort held significantly stronger beliefs that medications were necessary (P = 0.0035). Approximately 20% of adolescents in both cohorts had accepting attitudes toward their prescribed medicine. However, compared to the control group, adolescents in the transition cohort were less skeptical of (6.8% vs 20.8%) and more ambivalent (61% vs 34%) (OR = 0.15; 95%CI: 0.03-0.75; P = 0.02) to treatment. CONCLUSIONAttendance at dedicated transition clinics was associated with differences in attitudes in adolescents with IBD.

Colorectal cancer and 18FDG-PET/CT:What about adding the T to the N parameter in loco-regional staging?

AIM:To evaluate whether FDG-positron emission tomography(PET)/computed tomography(CT)may be an accurate technique in the assessment of the T stage in patients with colorectal cancer.METHODS:Thirty four consecutive patients(20 men and 14 women;mean age:63 years)with a histologically proven diagnosis of colorectal adenocarcinoma and scheduled for surgery in our hospital were enrolled in this study.All patients underwent FDG-PET/CT preoperatively.The primary tumor site and extent were evaluated on PET/CT images.Colorectal wall invasion was analysed according to a modified T classification that considers only three stages(≤T2,T3,T4).Assessment of accuracy was carried out using 95%confidence intervals for T.RESULTS:Thirty five/37(94.6%)adenocarcinomas were identified and correctly located on PET/CT images.PET/CT correctly staged the T of 33/35 lesions identified showing an accuracy of 94.3%(95%CI:87%-100%).All T1,T3 and T4 lesions were correctly staged,while two T2 neoplasms were overstated as T3.CONCLUSION:Our data suggest that FDG-PET/CT may be an accurate modality for identifying primary tumor and defining its local extent in patients with colorectal cancer.

Vehicular Beacon Broadcast Scheduling Based on Age of Information(AoI)

Vehicular beaconing plays an important role to facilitate various applications in the paradigm of Internet of Vehicles(IoV). Due to high dynamic and resource limitation in IoV, how to schedule the vehicular beacon broadcast is challenging, especially in dense scenarios. In this paper, we investigate the beacon broadcast scheduling problem considering the Age of Information(AoI). We first propose an algorithm minimizing the expected sum of AoI considering the limited communication resource and vehicle mobility. Then the performance of the proposed algorithm is analyzed. With the proposed algorithm, the optimal solution can be obtained under certain conditions. Extensive simulations are conducted to verify the efficiency, effectiveness and fairness of the proposed solution.

Transradial Versus Transfemoral Approach for Percutaneous Coronary Intervention in Elderly Patients in China： A Retrospective Analysis

Objective To compare hospital costs and clinical outcomes between transradial intervention （TRI） and transfemoral intervention （TFI） in elderly patients aged over 65 years. Methods We identified 1229 patients aged over 65 years who underwent percutaneous coronary intervention （PCI） in Fuwai Hospital, Beijing, China, between January 1 and December 31, 2010. Total hospital costs and in-hospital outcomes were compared between TRI and TFI. An inverse probability weighting （IPW） model was introduced to control potential biases. Results Patients who underwent TRI were younger, less often female, more likely to receive PCI for single-vessel lesions, and less likely to undergo the procedure for ostial lesions. TRI was associated with a cost saving of CNY7495 （95%CI： CNY4419-10 420）. Such differences were mainly driven by lower PCI-related costs. TRI patients had shorter length of stay （1.9 days, 95%CI： 1.1-2.7 days）, shorter post-procedural stay （0.7 days, 95%CI： 0.3-1.1 days）, and fewer major adverse cardiac events （adjusted odds ratio = 0.47, 95%CI： 0.31-0.73）. There was no statistical significance in the incidence of post-PCI bleeding between TRI and TFI （P〉0.05）. Such differences remained consistent in clinically relevant subgroups of acute myocardial infarction, acute coronary syndrome, and stable angina. Conclusion The use of TRI in patients aged over 65 years was associated with significantly reduced hospital costs and more favorable clinical outcomes.

Age and outcomes of primary percutaneous intervention for ST elevation myocardial infarction in a tertiary center are we there yet？

Background Primary percutaneous intervention （PPCI） is the treatment of choice for ST elevation myocardial infarction （STEMI） but robust evidence in the very elderly is lacking. We compared PPCI outcomes between different age quartiles （quartile I 〈 60 years, quartile 2 〉 60 to 〈 70 years, quartile 3 〉 70 to 〈 80 years, quartile 4 〉 80 years）. Methods Retrospective observational analysis of our Morriston Tertiary Cardiac Center （Abertawe Bro Morgannwg University Health Board） patients from 2005 to 2010 with STEMI who underwent PPCI. Resnlts Of 434 patients, 57 （13%） were in quartile 4 （〉 80 years）. In older age quartiles, patients were less likely to receive a drug eluting stent （DES, P = 0.001） or glycoprotein IlbAIIa inhibitor （GPI, P 〈 0.0001）. Increase in age was associated with reduced time to survival （13-coefficient： -0.192, t： -3,70, 95%CI： --4.91 to -1.50, P 〈 0.0001） as was the presence of cardiogenic shock 03-coefficient： -0.194, t = 3.77, 95%CI： -5.26 to -1.65, P 〈 0.0001）. Use of GPI was associated with increased time to survival （p-coefficient： 0.138, t = 2.82, 95%CI： 1.58-8.58, P = 0.005） but older age quartiles were less likely to receive GPI （P 〈 0.0001）. In-hospital mortality （1.8% quartile 1, 3.6% quartile 2, 10.9% quartile 3 and 12.3% quartile 4, P = 0.002） and 1-year mortality （5.4% quartile 1, 5.5% quartile 2, 16.8% quartile 3 and 24.6% quartile 4, P 〈 0.0001, respectively） was significantly higher in older age quartiles. Conclusions Increased short term and intermediate term mortality is seen in the very elderly after PPCI. Age and cardiogenic shock were prognostic factors. Intervention should not be based on age alone and awareness regarding prognostic factors can help improve management.

Quasi-biennial oscillation signal detected in the stratospheric zonal wind at 55–65°N

To investigate the impacts of the quasi-biennial oscillation （QBO） on high-latitude circulation and the Arctic vortex, stratospheric zonal wind at 55-65°N is analyzed. The seasonal cycle, solar cycle, and linear trend in the zonal wind at these latitudes are analyzed and removed, and the QBO signal is retrieved from the monthly zonal wind for the period 1979-2014. The zonal wind has a strong decreasing trend in winter, with a maximum decrease （less than -0.35 m s-1 yr-1） occurring within 70-100°E. The zonal wind has an in-phase response of 1.6 m s-1 to the solar cycle, with a maximum within 100-140°E. A clear QBO signal is detected in the zonal wind during the period 1979-2014, with an amplitude of 2.5 m s-1 and a period of 30 months. The latitudinal distribution of the QBO signal is inhomogeneous, with a maximum within 120-180°E and a minimum within 25-45°E.

读《马克思致巴·瓦·安年柯夫的信》

这是马克思写给友人的一封长信。在信中,马克思以批判蒲鲁东《贫困的哲学》为主线,在逐一驳斥蒲鲁东各种由＂一个非常没有秩序的头脑中＂＂虚构＂出来的各种论点的同时,

Role of insulin/insulin-like growth factor 1 signaling pathway in longevity

The insulin/insulin-like growth factor 1 (IGF-1) signaling pathway is evolutionary conserved in diverse speciesincluding C.elegans, saccharomyces cerevisiae, Drosophila melanogaster, rodents and humans, which is involved in many interrelated functions that are necessary for metabolism, growth and reproduction. Interestingly, more and more research has revealed that insulin/IGF-1 signaling pathway plays a pivotal role in the regulation of longevity. Generally, disruption of the power of this pathway will extend longevity in species ranging from C.elegansto humans. The role of insulin/IGF-1 in longevit yis probably related to stress resistance. Although the underlying mechanisms of longevity are not fully understood, the Insulin/IGF-1 signaling pathway has attracted substantial attention and it will be a novel target to prevent or postpone age-related diseases and extend life span. In this review, we mainly focus on the similar constitution and role of insulin/IGF-1 signaling pathway in C.elegans, saccharomyces cerevisiae, rodents and humans.

一封二十年前的信

路过一片正拆迁的民居尘烟遮蔽了日月一面墙突然被洞开里面的血肉敞开了没有谁把窗口的眺望退回去只有残壁

The Extent of Voluntary Information in the Annual Report and the Share Price Volatility： Application of DEA and SFA on the French Market

In the current paper, the authors investigate empirically the relationship between the share price volatility and the amount of voluntary information disclosed in the corporate annual report. The authors use the data envelopment analysis （DEA） and the stochastic frontier analysis （SFA） models on a sample of 50 listed French firms belonging to the Soci6t6s des Bourses Fran^aises （SBF250） index from 2004 to 2008. The authors focus on the extent of voluntary disclosure in the annual reports that have been measure by using a composite disclosure index. Then, the authors study the relevance of disclosure policies through the ability of the voluntary disclosure level to effectively reduce the share price volatility. The findings of DEA and SFA provide, in average, highly efficient scores of the sample, reveal the several dispositions taken by the French Exchange Market authorities and the initiative of French firms to improve the market stability. In addition, the findings highlight, in average, stability of the firms＇ efficiency scores over the studied period. The authors explain these findings by the stability of corporate disclosure policy as suggested in previous literature （e.g., Botosan, 1997）. However, there are some differences between the findings of SFA and DEA models.