利用大数据分析技术的智能化网络故障诊断系统

随着网络技术的快速发展以及各种新网络业务的出现，网络的规模日益扩大和复杂。同时，各种网络服务对于网络可靠性的要求也逐渐提高，这就对网络的维护提出了更高的要求。在这种情况下，传统的网络维护模式逐渐不能适应现代网络发展的需求。针对现代大型网络的故障诊断问题，利用大数据分析技术，设计并完成了一套整体的智能化故障诊断系统。在此系统中，针对不同的故障类型，利用能够获取到的数据类型，针对性地设计了相关的故障诊断模块和算法。系统整体基于开源的数据处理平台构建，具备良好的可扩展性。通过实际案例数据的验证，结果表明此系统具备良好的处理实际网络故障的能力，将大数据分析技术应用于网络故障诊断领域也具备较强的可行性。     

How about selling commodity futures losers?

This paper explores the benefits of extending the investment universe to commodity futures, from the perspective of momentum traders. We find that the growth-optimal portfolio includes negative (positive) weights on commodity futures losers (stock winners). Motivated by this finding, we construct a joint momentum strategy, buying stock winners and selling commodity futures losers, and show that it generates an average monthly return of up to 1.91% and provides much lower skewness (0.04) and kurtosis (1.27) than a traditional stock momentum strategy. It also greatly improves profitability, especially in unfavorable market states, and thus effectively manages tail risk.     

Do External Knowledge Sourcing Modes Matter for Service Innovation? Empirical Evidence from South Korean Service Firms

To source external knowledge, firms in the service area use various sourcing modes simultaneously suitable for their internal needs or external environments. Each external knowledge sourcing mode has distinctive characteristics, and as such, they can offer different advantages and/or disadvantages to the firms. Thus, the effects of external knowledge sourcing on service innovation may vary depending on the sourcing modes. The current study aims to empirically examine the different effects of various external knowledge sourcing modes on service innovation. The study identifies three external knowledge sourcing modes: joint development, technology purchasing, and external information acquisition. Three hypotheses are established to examine the relationships between the extent of utilizing each mode and service innovation performance in terms of new service introduction. The data for analysis are selected from the “Korean Innovation Survey 2006: Service Sector” (KIS 2006). It is regarded as South Korea's version of the Community Innovation Survey (CIS). The KIS 2006 data set covers joint development, technology purchasing, and external information acquisition activities of corporations in the service sector in South Korea. The study empirically analyzes the data set using a negative binomial regression model. The results first demonstrate that the extent of the joint development has an inverted U‐shaped relationship with the service innovation performance. Second, the results indicate that, on the other hand, service innovation performance decreases with the increase to the extent of the technology purchasing when the extent is below the threshold. On the other hand, it increases with the increase to the extent of the technology purchasing; this occurs when the extent exceeds the threshold. Third, the results show that external information acquisition has a positive effect on service innovation performance. These findings support that the extent of utilizing each mode has different relationships with service innovation performance. The findings suggest that service firms need to utilize joint development at a moderate level, active technology purchasing, and as much external information acquisition as possible to maximize service innovation performance. In practice, this finding can help managers of service firms select appropriate external knowledge sourcing modes and determine the optimum level of use for each mode. This study also can help firms build up strategies for external knowledge sourcing.     

农地流转对农户生计转型影响的实证分析

[目的]为清晰识别土地流转对农户生计转型的影响程度,以期为后期土地流转政策及农户生计引导政策提供科学的决策依据。[方法]文章借鉴已有研究方法,基于农户可持续生计分析框架,利用内蒙古4个市区的380户农户样本数据,采用Multinomial Logit模型对参与土地流转和未参与土地流转农户的生计模式进行了分析,客观评价农村土地流转对农户生计转型的影响。[结果]农地流转在一定程度上对农户的生计转型产生了显著影响,拥有较低自然资本和较高金融资本的农户倾向混合型和务工型生计策略,同时人力资本水平高的家庭更倾向于采取混合型生计策略,而不是采取农业型生计策略。[结论]农地流转后,农户从繁重的种植业活动中得以解放,有了更多时间和精力从事非农生产活动,生计策略由单一化走向多样化,从传统的主要依赖种植业到经营养殖业、从事建筑业、交通运输业、批发零售业等非农行业,多元化了农户的收入来源。     

人才培养目标与教学管理水平的关系整合——以高职土建类专业为例

高职土建类专业人才培养目标与教学管理有着密切的关系。教学管理对人才培养目标的实现产生多方面的影响,主要体现在目标管理、过程管理、绩效管理三个方面,在明确学生学习目标、激励学生学习动力、调动学生学习积极性、引导学生全面发展等方面具有举足轻重的作用。为了更好地实现人才培养目标,应实现教学管理重心从传统的过程管理向目标管理和绩效管理的根本性转变。     

Analysis and design of microfinance services: A case of ROSCA

Rotating savings and credit association (ROSCA) is a well-known microfinance association widely used in many countries around the world with long histories. By considering extra profits that such a system can provide when compared to banking transactions, we develop optimization problems to achieve an optimal design of a ROSCA. We find that ROSCAs might attract investors when deposit and loan rates from formal banking systems are not favorable. Furthermore, optimal rates and optimal orders to maximize system outputs are reported.     

影响酒精酵母发酵效果的因素研究

酒精酵母发酵作为现代工业的一个重要指标,酒精酵母的发酵效果也受到了人们的重视。在同样的条件下使酒精酵母拥有更好的发酵效果是工业造酒想要达到的目标。通过实验来探究在酒精酵母发酵过程中影响其生长速度与繁殖的因素。酒精发酵过程中蔗糖会分解成果糖和葡萄糖,酵母发酵过程中首先利用葡萄糖而后利用果糖,果糖就会成为残留物,使得其产生差异性。通过实验发现影响酒精酵母发酵效果的因素有温度、通风、pH、尿素、糖比例等。     

跨境网购中的消费者反馈信息和信任相关因素研究

随着在国外网站购物的消费者数量的增加,跨境电子商务的发展已极具潜力。本文针对"跨境网购意愿"的影响因素展开调查,建立了一个基于信任和风险的消费者行为模型;本文针对模拟的三个反馈场景,调研了912个样本,重点检验了"来自不同国家消费者的信息反馈对上述因素之间相关性的影响"。研究结果表明,在跨境网购时,"风险"和"信任"对购买意愿有影响,但二者受消费者反馈信息的影响相对较小,而其他因素间的相关性则会受到样本组间差异的影响,比如,在含反馈信息的样本组中,对电子商务的"普遍信任"会显著影响消费者对某一具体境外购物网站的信任。     

钢锥斗仓的设计

本文以某工程钢锥斗仓的设计为例,详细阐述钢锥斗仓仓壁和水平加劲肋的内力、变形计算,并验算仓壁和加劲肋的强度和刚度。