Examining end users’ ability to select business services: A conceptual framework and an empirical study

Software made from autonomous business services is gaining popularity. Now end users can build large applications by assembling a suite of services. Because some end users might have limited knowledge of their requirements and the functionality of available services, the key challenge is to find the services needed to build an application. The task of finding the services matching requirements requires specialized knowledge—knowledge of requirements and the functionality of available services—not just mere general competence. Moreover, the complexity of the requirements could also hinder the ability of end users to select services. However, there is little research into how the end users’ sophistication and requirement complexity affect their ability to avoid duplication (i.e., select the most cost-effective set of services) and select a set of services that satisfy their requirements. We provide a conceptual framework for the choice problem faced by the decision maker and develop a set of hypotheses on end user's sophistication and requirement complexity, and the impact of these factors on outcome performance—the ability to avoid duplication and select the appropriate services. Then we conduct an empirical study to test the hypotheses. Empirical results offer support for all hypotheses. Our work has several implications. We demonstrate both conceptually and empirically that end users’ naivety has a significant impact on service duplication. For a profit-maximizing service vendor, knowledge of the end user's sophistication/naivety allows there to be different pricing strategies: (1) a pure component strategy, (2) a pure bundling strategy, or (3) a mixed bundling strategy.     

计算机专业电路课程教学改革与实践

本文针对计算机专业电路课程教学工作中存在的问题,从课程体系、课程内容的调整与选择,教学方法、课程考核方法的改革等方面提出了若干改进措施和建议。     

Photoreceptor Cells Constitutively Express IL-35 and Promote Ocular Immune Privilege

Interleukin-27 is constitutively secreted by microglia in the retina or brain, and upregulation of IL-27 during neuroinflammation suppresses encephalomyelitis and autoimmune uveitis. However, while IL-35 is structurally and functionally similar to IL-27, the intrinsic roles of IL-35 in CNS tissues are unknown. Thus, we generated IL-35/YFP-knock-in reporter mice (p35-KI) and demonstrated that photoreceptor neurons constitutively secrete IL-35, which might protect the retina from persistent low-grade inflammation that can impair photoreceptor functions. Furthermore, the p35-KI mouse, which is hemizygous at the il12a locus, develops more severe uveitis because of reduced IL-35 expression. Interestingly, onset and exacerbation of uveitis in p35-KI mice caused by extravasation of proinflammatory Th1/Th17 lymphocytes into the retina were preceded by a dramatic decrease of IL-35, attributable to massive death of photoreceptor cells. Thus, while inflammation-induced death of photoreceptors and loss of protective effects of IL-35 exacerbated uveitis, our data also suggest that constitutive production of IL-35 in the retina might have housekeeping functions that promote sterilization immunity in the neuroretina and maintain ocular immune privilege.     

推广应用蓄热式电热锅炉可行性研究

本文通过介绍蓄热式电热锅炉的运行特性,并就燃煤、燃油、天然气锅炉和蓄热式电热锅炉的综合经济效益进行了比较,阐明蓄热式电热锅炉在经济运行方式下运作,一可降低运行费用;二可调荷避峰,在一定范围内推广使用完全可行。     

汽车行业供应链管理文化——美国、日本和中国的比较

在文化对比研究的基础上,结合现有的汽车行业供应链管理理论,主要比较了美国、日本和中国三种不同的文化背景对各自管理价值观及管理模式发生的影响,探讨了不同的文化背景对汽车供应链凝聚力、领导方式、质量与劳动力成本以及结构稳定性等方面有何影响,以及最终对汽车供应链管理模式发生的影响.     

沈从文与服饰史研究的三重证据法

沈从文的《中国古代服饰研究》实际上已意识到服饰史料的三个种类:实物、图像、文献,惜其未能详尽其言。本文从其中分析出最适合服饰史研究的三重证据法,并结合罗兰·巴特对于服饰符号体系的三分进行了进一步阐述,参照西方服装史的研究,提出运用三重证据法研究中国服饰史的重要意义。     

大型抽水蓄能机组现场启动调试技术研究及应用

随着抽水蓄能电站建设的不断增加,越来越多的抽水蓄能机组需投入电网运行,为了确保新投入机组的安全、可靠、稳定运行,新投产机组必须经过一整套严格的启动试验程序,以检验机组的安装和制造质量,同时为机组能否进入电网稳定运行作出评价。本文结合工程实际,详细叙述了抽水蓄能机组现场启动调试的步骤和顺序,并就电站首机首次启动方式进行了分析和论证。     

油水两相非达西试井分析新进展及其展望

简述了低渗透油藏、油水两相低渗透油藏非达西试井分析研究的新进展。提出对低渗透油藏应建立公认的非达西渗流数学模型,准则数、数值试井模型及分析方法,指出低渗透油藏是否存在非达西渗流,除加强渗流特征的影响因素、渗流形成机理的研究之外,还要从实验上能够模拟代表真实的现场条件的体现度。     

深层低渗气藏岩心渗透率测试技术探索

储层岩石渗透率是量度油气流动能力最重要的物性参数之一。因此,准确测定地层岩石渗透率,特别是地层岩石就地渗透率对科学开发油气田具有重要意义。深层低渗气藏由于上覆压力大、地温高、渗透率低(一般小于1×10     

基于岩心核磁共振实验数据确定阳离子交换容量

以HSK方程为基础,提出了一种利用岩心核磁共振实验数据计算阳离子交换容量Qv的方法.该方法与湿式化学阳离子交换容量分析法相比存在一定的误差.12块岩样数据显示,相对误差范围12％～95％,平均相对误差为55％.分别从溶液矿化度、核磁共振总孔隙度以及黏土束缚水T2截止值等参数出发,开展了核磁共振确定阳离子交换容量影响因素分析研究.黏土束缚水T2截止值是影响核磁共振计算阳离子交换容量的关键参数,黏土束缚水T2截止值是可变的,而不是传统意义上的3 ms.基于岩心核磁共振准确求取阳离子交换容量的前提是准确求取黏土束缚水T2截止值.