全渠道零售场景下配送车辆路径问题     

施天娇  杨斌  朱小林 《上海海事大学学报》2020,41(2):51-57

为研究全渠道零售的配送系统对企业物流成本的影响,综合考虑时间窗、车型选择等因素,以运输成本最低为目标,建立高度协同的全渠道零售场景下的物流配送模型。该模型采用自适应遗传算法求解,利用MATLAB进行算例分析。结果显示:全渠道零售模式下的车辆调度方案能迅速响应消费者需求,与一般配送模式相比可以减少物流成本,优化车辆配置。与粒子群优化算法相比,自适应遗传算法的运行时间更短、优化结果更好,这验证了模型和算法的可行性和有效性。  相似文献   

乡村振兴战略下农村公共体育服务的协同治理研究——基于多元主体协同治理模型     

张文静  沈克印 《沈阳体育学院学报》2020,(3):35-42

农村公共体育服务作为农村体育中的基本组成部分,其发展与治理是实现乡村振兴的重要内容,是提升体育治理能力现代化和实现体育强国梦的必经之路。运用文献资料、专家访谈等研究方法,结合乡村振兴战略的时代背景,基于协同治理的基本理论,把握农村公共体育服务协同治理的现实动因,分析农村公共体育服务协同治理中存在的均等化供给落实不到位、服务管理体制结构失衡、市场经济模式功能缺失、农民需求表达体系欠缺等现实问题。通过构建农村公共体育服务多元主体协同治理模型,确保治理公正平等、完善政府职能结构、促进机制融合发展、激发需求主体活力等方面实现农村公共体育服务有效治理。  相似文献   

幼儿园区域活动的多元构建策略探研     

林娜 《成才之路》2020,(9):98-99

区域活动是幼儿园一日活动中重要的教育形式之一,对幼儿的成长有重要作用。教师要根据幼儿发展需求和主题教育目标,对区域教学活动进行改进,在综合了解教情、学情的基础上,激发幼儿学习探索积极性,激活课堂教学活力因子,为趣味课堂的构建奠定基础。  相似文献   

Systematic Comparison of Decision Accuracy of Complex Compensatory Decision Rules Combining Multiple Tests in a Higher Education Context          下载免费PDF全文

Iris E. Yocarini  Samantha Bouwmeester  Guus Smeets  Lidia R. Arends 《Educational Measurement》2018,37(3):24-39

This real‐data‐guided simulation study systematically evaluated the decision accuracy of complex decision rules combining multiple tests within different realistic curricula. Specifically, complex decision rules combining conjunctive aspects and compensatory aspects were evaluated. A conjunctive aspect requires a minimum level of performance, whereas a compensatory aspect requires an average level of performance. Simulations were performed to obtain students' true and observed score distributions and to manipulate several factors relevant to a higher education curriculum in practice. The results showed that the decision accuracy depends on the conjunctive (required minimum grade) and compensatory (required grade point average) aspects and their combination. Overall, within a complex compensatory decision rule the false negative rate is lower and the false positive rate higher compared to a conjunctive decision rule. For a conjunctive decision rule the reverse is true. Which rule is more accurate also depends on the average test reliability, average test correlation, and the number of reexaminations. This comparison highlights the importance of evaluating decision accuracy in high‐stake decisions, considering both the specific rule as well as the selected measures.  相似文献   

核心素养时代高中美术鉴赏的"教"与"学"     

刘晓文 《美育学刊》2020,11(1):13-18

2013年教育部开始着手制定《中国学生发展核心素养》,由此启动普通高中美术课程标准的修订,这也标志中国的教育已经进入了核心素养时代。美术鉴赏是高中美术课程中重要的内容,但实际教学效果却不尽人意。教与学是一方主导、一方被动的分离状态,表现为教师为教而教,学生为知识而学习。学生无暇顾及与高考无关的课程,往往浅表性、单向度地接受碎片化知识的输入,因而不能有效地对情境中的图像进行识读和判断。核心素养下的高中美术鉴赏需要唤醒教与学双方主体的课程意识,同时也对教师的专业素质提出了更高的要求。创新教学过程和学生的学习方法是实现学生核心素养形成的必经桥梁,是值得专家学者和广大一线教师不断地去探究、发掘的重要环节。  相似文献   

Score Reporting for Examinees with Incomplete Data on Large‐Scale Educational Assessments     

Sandip Sinharay 《Educational Measurement》2021,40(1):79-91

Technical difficulties occasionally lead to missing item scores and hence to incomplete data on computerized tests. It is not straightforward to report scores to the examinees whose data are incomplete due to technical difficulties. Such reporting essentially involves imputation of missing scores. In this paper, a simulation study based on data from three educational tests is used to compare the performances of six approaches for imputation of missing scores. One of the approaches, based on data mining, is the first application of its kind to the problem of imputation of missing data. The approach based on data mining and a multiple imputation approach based on chained equations led to the most accurate imputation of missing scores, and hence to most accurate score reporting. A simple approach based on linear regression performed the next best overall. Several recommendations are made regarding the reporting of scores to examinees with incomplete data.  相似文献   

金字塔结构下多个控制性大股东的制衡效应   总被引：1，自引：0，他引：1  

李学伟  马忠 《中国软科学》2007,(7):62-70

本文研究了中国上市公司金字塔股权结构下存在多个大股东对终极控制人控制权力的影响，考察了当多个控制性大股东股权性质不同时，股权制衡程度对公司经营绩效的作用差异。本文发现多个大股东与最终控制人之间既存在监督效应，也存在合谋效应。当其他多个控制性大股东性质不同时，对终极控制人的监督动机超过了合谋动机，从而对公司经营绩效产生积极的影响。  相似文献   

多项式模代数在多值逻辑系统中的适应性     

杜芹香  赵俊 《科技通报》1997,13(1):44-47

针对文献［１］中的模代数系统对多值逻辑的适应性定理，指出了多项式模代数系统对于基数为素数幂值逻辑的适应性  相似文献   

基于多元智能理论的个性化教学策略研究--以“计算机应用基础”课程为例     

唐晓凤 《科教文汇》2020,(14):75-77

基于多元智能理论制定《学习者多元智能问卷调查表》并实施问卷调查,辅以计算机应用基础课程学习前测试数据,将个性化班学习者分为先锋小组、奋斗小组和勤学小组。以"计算机应用基础"课程为例,从教学目标、教学内容、教学方法和评价机制等方面制定基于多元智能理论的个性化教学策略并实施。最后,利用SPSS 22.0分析策略实施前后效果,对策略进行实证研究。研究结果显示,该策略有助于挖掘学习者的潜能,发展学习者的个性,增加学习者的学习兴趣和提升学习者的学习效率。  相似文献   

Studying the amateur artist: A perspective on disguising data collected in human subjects research on the Internet     

Amy Bruckman 《Ethics and Information Technology》2002,4(3):217-231

In the mid-1990s, the Internet rapidly changedfrom a venue used by a small number ofscientists to a popular phenomena affecting allaspects of life in industrialized nations. Scholars from diverse disciplines have taken aninterest in trying to understand the Internetand Internet users. However, as a variety ofresearchers have noted, guidelines for ethicalresearch on human subjects written before theInternet's growth can be difficult to extend toresearch on Internet users.In this paper, I focus on one ethicalissue: whether and to what extent to disguisematerial collected online in publishedaccounts. While some people argue thatvulnerable human subjects must always be madeanonymous in publications for their ownprotection, others argue that Internet usersdeserve credit for their creative andintellectual work. Still others argue thatmuch material available online should betreated as ``published.' To attempt to resolvethese issues, I first review my own experiencesof disguising material in research accountsfrom 1992 to 2002. Some of the thorniestissues emerge at the boundaries betweenresearch disciplines. Furthermore, manyhumanities disciplines have not historicallyviewed what they do as human subjects research. Next, I explore what it means to do humansubjects research in the humanities. Inspiredby issues raised by colleagues in thehumanities, I argue that the traditional notionof a ``human subject' does not adequatelycharacterize Internet users. A useful alternatemental model is proposed: Internet users areamateur artists. The Internet can be seen as aplayground for amateur artists creatingsemi-published work. I argue that thisapproach helps make some ethical dilemmaseasier to reason about, because it highlightskey novel aspects of the situation,particularly with regard to disguisingmaterial. Finally, I conclude by proposing aset of practical guidelines regardingdisguising material gathered on the Internet inpublished accounts, on a continuum from nodisguise, light disguise, moderate disguise, toheavy disguise.  相似文献