Value Creation for the After-Sales Services： Organizational and Strategic Perspectives

As a part of the product development process, the after-sales services are not only a source of innovation, but also they benefit from value creation through new managerial methodologies for the achievement of competitive advantage and customer satisfaction. The objective of the paper is to further understand value creation for the after-sales services. We present the case of the creation of a new business for the after-sales services for the entrance into a new market. The new business is created by two gurus in the aerospace industry. A typology of guidelines is derived, based on organizational and strategic perspectives, for the after-sales services value creation and the guidelines for the creation of a new business as well as for the entrance of into a new market are presented.

3M Strengthening After-sales Service

The rapid rise and development of the computer industry in China has promoted the production of and demand for computer diskettes. China, with over 30 diskette production lines and an annual production of 2 billion diskettes, including some for export, has become the biggest diskette producing country in the world. However, imported diskettes, especially high grade brands, enjoy a good market here. That’s why many world renowned diskette

Length matters:Scalable fast encrypted internet traffic service classification based on multiple protocol data unit length sequence with composite deep learning

As an essential function of encrypted Internet traffic analysis,encrypted traffic service classification can support both coarse-grained network service traffic management and security supervision.However,the traditional plaintext-based Deep Packet Inspection(DPI)method cannot be applied to such a classification.Moreover,machine learning-based existing methods encounter two problems during feature selection:complex feature overcost processing and Transport Layer Security(TLS)version discrepancy.In this paper,we consider differences between encryption network protocol stacks and propose a composite deep learning-based method in multiprotocol environments using a sliding multiple Protocol Data Unit(multiPDU)length sequence as features by fully utilizing the Markov property in a multiPDU length sequence and maintaining suitability with a TLS-1.3 environment.Control experiments show that both Length-Sensitive(LS)composite deep learning model using a capsule neural network and LS-long short time memory achieve satisfactory effectiveness in F1-score and performance.Owing to faster feature extraction,our method is suitable for actual network environments and superior to state-of-the-art methods.

Probe on Network-based Collaborative Maintenance Model for After-sales Equipment

In order to make equipment run safely, economically and continuously, some new maintenance models were put forward to improve the equipment after-sale maintenance service, such as E-maintenance, third-party maintenance, etc. To certain extent, the models solved the problem of the distance between the manufacturer and customer and the dispersion of the maintenance technologies, however, those resources are still widely distributed and do not collaborate efficiently. In this paper, a network-based collaborative maintenance service model was proposed for after-sales equipment to solve the problem of maintenance resources integration. Concretely, equipment designers, maintainers, spare parts suppliers and maintenance experts were grouped together to establish dynamic alliance. The leader of the alliance is the manufacturer under guaranty period or equipment user exceeding the guaranty period. The process of maintenance service was divided into three stages which are fault diagnosis, maintenance decision and maintenance implementation. The sub-alliances were established to carry out maintenance work at each stage. In addition, the business process of network-based collaborative maintenance was analyzed and collaborative business system for equipment＇s after-sales collaborative maintenance service was designed. In the end, an informational economics model of network-based collaborative maintenance was established to demonstrate the effectiveness of this maintenance model.

An efficient priority service model with two-level-polling scheme

This paper considers an efficient priority service model with two-level-polling scheme which the message packets conform to the discrete-time Geom/G/1 queue with multiple vacations and bulk arrival. By the embedded Markov chain theory and the probability generating function method, we set up the mathematics functions and give closed form expressions for obtaining the mean cyclic period （MCP）, the mean queue length （MQL） and the mean waiting time （MWT） characteristics, the analytical results are also verified through extensive computer simulations. The performance analysis reveals that this priority polling scheme can gives better efficiency as well as impartiality in terms of system characteristics, and it can be used for differentiating priority service to guarantee better QoS and system stability in design and improvement of MAC protocol.

Empirical Validation of Key-Factors of Connected Remote Services

Based on an exploration of key-factors of connected remote services(CRS)by means of a qualitative study among German automotive customers,this study operationalizes the phenomenon.The definition of CRS as service innovation captures the special particularity of connectedness as attribute,providing simultaneous connectivity of customers to a service object(e.g.car),and a service provider(e.g.dealer and car manufacturer).The measurement model is conceptualized as a second-order formative construct defining the five key-factors:convenience,connectedness,comfort,safety,and reliability as first-order reflective constructs as identified in the prior qualitative study.The scale validation was undertaken at the first-and second-order levels.The result confirms the five distinct first-order measurement models.At the second-order level,a multiple indicators and multiple causes(MIMIC)model was employed to assess the validity of the formative measurement model.The operationalization confirms the distinctness of the five CRS key-factors.Further,the results suggest that four of five key-factors significantly contribute to the overarching construct of connected remote services,with safety and connectedness being the most important contributors and comfort to be shown as not significant.The confirmed concept of CRS will provide future research with a basis to explore different impacts of CRS use,e.g.in the context of technology acceptance and intentional customer behavior.

China's Post and Telecommunications Service

In 1994, the handling capacity and business volume of China’s posts and telecommunications fulfilled the target of the Eighth Five-Year Plan (1991-1995) a year ahead of schedule and that of quadrupling the business volume during the period of 1980-2000 six years in advance. 1. The comprehensive communications capacity further enhanced with the construction of the telecommunication mains transmission network mainly composed of optical fibre cables is now in place. Seven

离散时间的完全服务并行优化轮询排队系统特性分析

轮询是一种依次有序服务的系统资源动态调度机制.针对服务器在站点间查询、服务和转移过程中的流水线作业方式导致了系统整体服务效率较低的问题,本文提出了完全服务的并行优化轮询系统.首先,构建了系统的单服务器多队列排队模型和相应的系统状态方程,并精确解析出系统特性参数的完整数学解析表达式.此外,还提出了一种系统状态稳定性的判定方法,对不同负载状态下的系统稳定性进行了定量分析.计算机仿真的统计分析结果与理论计算值相一致.最后,系统性能分析表明,在保持周期性、无冲突服务的基础上,系统的队长、时延特性和稳定状态下负载能力均得到了较大的提高.

连续时间完全-限定(K=2)两级轮询系统性能分析

为了实现区分网络优先级、保证公平性、提高普通站点的性能和效率,在完全-限定(K=1)两级轮询控制系统模型的基础上,提出连续时间完全-限定(K=2)两级轮询控制系统模型。在该模型中,使用限定(K=2)服务和完全服务分别对普通站点和中心站点进行服务。中心站点转换到普通站点进行服务时,使用捎带查询方式。在此基础上,采用马尔可夫链和概率母函数的数学方法建立该轮询系统模型,并推导平均排队队长和时延。利用MATLAB进行仿真实验,结果表明:理论值与仿真值误差较小,验证了理论分析的正确性;与门限-完全服务模型相比,该模型中心站点的队长和时延均小于门限-完全服务中心站点的队长和时延,具有更高的优先级;与一级完全服务和一级限定(K=2)服务模型相比,区分了优先级,性能分别提升11.7%和14.5%,说明两级服务远好于一级服务;与完全-限定(K=1)两级服务模型相比,增加了发送的数据,减少了等待时间,性能提升13.04%左右,进一步优化了普通站点的性能。

面向加密流量的社交软件用户行为识别

随着智能终端和社交网络越来越融入人们的日常生活,针对社交软件的用户行为识别在网络管理、网络环境监管和市场调研等方面发挥越来越重要的作用.社交软件普遍使用端到端加密协议进行加密数据传输,现有方法通常提取加密数据的统计特征进行行为识别.但这些方法识别的性能不稳定且需要的数据量多,这些缺点影响了方法的实用性.提出了一种面向加密流量的社交软件用户行为识别方法.首先,从加密流量中识别出稳定的控制流数据,并提取控制服务数据分组负载长度序列.然后设计了2种神经网络模型,用于自动从控制流负载长度序列中提取特征,细粒度地识别用户行为.最后,以WhatsApp为例进行了实验,2种神经网络模型对WhatsApp用户行为的识别精准率、召回率和F1-score均超过96%.与类似工作的实验比较证明了该方法识别性能的稳定性,此外,该方法能够通过很少的控制流数据分组达到较高的识别精准率,对实时行为识别的研究具有重要的现实意义.

连续时间门限完全服务两级轮询系统性能分析

为区分业务优先级以及提高系统公平性与稳定性,在简化求解过程的基础上,提出一种连续时间门限完全服务两级轮询系统。系统状态由马尔科夫链得出并根据其建立数学模型,系统的平均循环周期、平均排队队长等性能参数由对数学模型的概率母函数进行求导所得,将求导结果与仿真实验进行对比,验证理论分析的准确性。将该系统与单级系统、其它两级系统进行对比,验证了该系统在保证业务优先级的同时更具公平性与稳定性。

2010-2019年株洲市职业性尘肺病患者生存状况及其影响因素

目的研究本市职业性尘肺病患者的生存状况以及可能的影响因素。方法回顾性选取2010—2019年本市职业性尘肺病新发及死亡病例的临床资料。重点分析职业性尘肺病患者生存状况的影响因素。结果2010—2019累计新发尘肺病1092例,已病死138例,病死率为12.64%;患者生存时间为2~120个月,平均107.30个月。不同性别、年龄、行业的职业性尘肺病患者的生存时间对比,差异无统计学意义(P均>0.05);不同接尘工龄、疾病种类、尘肺病分期患者的生存时间对比,差异有统计学意义(P均<0.05);COX生存分析结果显示,接尘工龄较长、尘肺病分期较高是职业性尘肺病患者生存状况的独立危险因素(P均<0.05)。结论接尘工龄较长、尘肺病分期较高可能是其生存状况的独立危险因素,需加强劳动者职业健康监护,早筛查出可疑尘肺样变者,早脱离粉尘接触,减缓尘肺病情进展。

兰州市中心城区城市绿道现状调查与对策研究

城市绿道是城市规划建设用地范围内,依托和串联城市公园绿地、广场、防护绿地等,供市民休闲、游憩、健身、出行的空间。文章通过对兰州市中心城区城市绿道现状进行调查,梳理分析绿道规划、建设、管护中存在的问题,提出优化策略,以期为兰州市城市绿道健康有序发展提供参考。

一种基于MDP的最优服务功能链长部署策略

随着网络功能虚拟化技术被越来越多的服务提供商应用,许多增值服务被作为虚拟服务功能部署在云数据中心。然而,如何在频繁转变的网络中部署服务功能,使其动态的部署和分配资源仍然是亟待解决的问题。论文提出了基于马尔可夫决策过程创建服务功能实例的部署方案,有效地应对由节点、链路资源使用及用户请求引起的网络动态转换,通过权衡服务质量和服务提供商收益两个目标来最优化部署的链路长度,能够保证服务质量的同时最大化服务提供商的收益。与其他方案相比,仿真结果验证了所提出方案的有效性,面对大量的用户请求时在系统延迟以及吞吐量方面表现更好。

海勤人员高尿酸血症知信行现状调查与对策研究

目的调查与分析海勤人员高尿酸血症相关知信行状况及影响因素,提出防治策略,为海勤人员高尿酸血症防治工作提供合理依据和科学指导。方法选择2020年1月至2022年1月在某特勤疗养中心、进行体检的海勤人员280例作为研究对象,所有海勤人员给予尿酸检测与高尿酸血症判定,调查知信行现状并进行相关性分析。结果在280例海勤人员中,发生高尿酸血症65例(高尿酸血症组),占比23.2%。高尿酸血症组的性别、年龄、体质指数、空腹血糖、收缩压、舒张压等与非高尿酸血症组对比,差异无统计学意义(P>0.05),两组海勤工作年限、受教育年限对比,差异有统计学意义(P<0.05)。高尿酸血症组的高尿酸血症知信行评分为(2.69±0.33)分,低于非高尿酸血症组的(3.45±0.25)分(P<0.05)。在280例海勤人员中,Logistics回归分析显示高尿酸血症知信行评分、海勤工作年限、受教育年限为导致高尿酸血症发生的重要因素(P<0.05)。结论海勤人员中高尿酸血症的发生率比较高,同时高尿酸血症知信行状态有待提高,高尿酸血症知信行评分、海勤工作年限、受教育年限为导致高尿酸血症发生的重要因素。

EFFECTS OF HYDRAULIC AND GEOMETRIC PARAMETERS ON DOWNSTREAM CAVITY LENGTH OF DISCHARGE TUNNEL SERVICE GATE

Aerators on discharge tunnel outlets may be regarded as an effective protection against cavitation erosion. The air entrainment of aerators is governed by a number of independent parameters, including the bottom slope of releasing free-surface flow tunnel downstream of service gate, the end top slope of pressure tunnel, the height of step, and the Froude number at take-off. During eight phases of experiments, the effects of above-mentioned parameters were observed on the cavity length downstream of the fully open operating service gate of a discharge tunnel. The results show that, the bottom slope of releasing free-surface flow tunnel has obvious effect on the cavity length as well as the Froude number at gate take-off. The effect of the step height variations on the cavity length could be considered for higher discharges and steeper tunnel top slope, particularly in higher discharges, resulting in shorter cavity length downstream of service gate.

综合绩效考核质控在某三级医院实施效果分析

目的探索应用综合绩效考核对某三甲医院质量控制实施效果进行评价分析。方法根据国家综合绩效考核指标制定某三级公立医院的绩效考核指标,通过监测、分析,评估分析某医院2019年-2021年综合绩效考核的实施对医院监测的医疗服务收入、平均住院日、三四级手术占比等指标的影响。结果通过对比分析,综合绩效考核质控后的医疗服务收入占比、三四级手术占比均高于未进行考核前的指标,平均住院日低于实施前。结论实施综合绩效考核质量控制可以促进医院的医疗质量及服务水平,可为下一步推进医院推进信息化质控及精细化高质量管理提供依据。

不同年龄、工龄护士职业紧张状况的流行病学调查研究

目的:探讨不同年龄和工龄护士的职业紧张水平,为采取有效的干预措施提供依据。方法:采用方便整群抽样方法对安徽省、江苏省和上海市7家医院1 144名护士进行问卷调查,内容包括一般人口学问卷和职业紧张问卷(OSI-R)。结果:在年龄方面,30～40岁年龄组护士,职业任务、任务过重、任务冲突得分均较高,个体紧张反应总均分及各子项(人际关系紧张反应除外)得分均较高,而个体应对资源总均分及娱乐休闲得分较低,且差异有统计学意义(P<0.01)。在工龄方面,工作5～15年组护士,职业任务总均分及各子项(任务模糊和责任感除外)得分均较高,个体紧张反应总均分及业务紧张反应、心理紧张反应得分均较高,而个体应对资源总均分及娱乐休闲得分较低,且差异有统计学意义(P<0.01或P<0.05)。结论:本调查结果显示,中青年护士职业紧张程度较高,应针对该群体护士采取有效的预防措施,减少由于职业紧张对她们的身心健康和工作产生的影响。

基于FPGA WSN轮询接入控制协议的研究

媒体接入控制(MAC)协议是连接物理链路和网络层直接的纽带,是保证网络高效通信的关键协议之一。根据无线传感器网络汇聚节点的工作特性,首次以FPGA(field programmable gate array)对轮询机制的接入控制协议进行了设计和实现。该设计充分利用FPGA的灵活性和可重构性的特点,采用硬件描述语言Verilog HDL和原理图相结合的方法,使用QuartusⅡ8.0进行综合和布线,在DE2开发板上进行测试。该设计具有实时性好、可靠性高、可移植性强等特点,能够有效减小传输时延,提高总线利用率。可广泛应用于无线传感器网络、软件无线电网络、ad hoc网络、军用综合业务网络、移动通信网络、物联网等领域。

深圳龙岗区职业性噪声与听力损失的流行病学研究

目的对调查深圳市龙岗区噪声企业工人听力损失的评价指标进行探讨。方法采用横断面流行病学调查方法,对深圳市龙岗区6家企业的稳态噪声作业环境进行调查,对386名接触噪声人员进行职业卫生学调查和听力测定,听力测定参照《职业性听力损伤诊断标准》(GBZ49-2002),并计算累积噪声暴露量(CNE)。结果386名噪声作业人员高频听力损伤发生率为74.09%,语频听力损伤发生率为50.52%;随CNE增加,听力损伤发生率有增高趋势(P<0.05);Logistic回归分析表明,高频、语频听损发生率与CNE呈显著相关,而与工龄的相关性不明显。结论在特区经济模式下CNE作为听力健康的评价指标比工龄史敏感。