Optimization of postal express line network under mixed driving pattern of trucks

Details about the movement of trucks on postal express lines are investigated to improve the performances of mail distribution. A mixed driving pattern of trucks is introduced to minimize the transportation cost of a postal express line network with a service level requirement. We formulate this problem as a mixed p meeting depots location with shipment scheduling problem and build a MINLP model. A two-level tabu search procedure based on shipment grouping method is developed. Through a series of computational experiments and sensitivity analysis on different instances, some managerial insights of the network under mixed driving pattern are revealed.     

职业学校语文课程不重视实训教学的原因分析

实训是一种强调通过实际训练让学生掌握、获取知识并提升能力的教学方法。作为工具性学科的职业学校语文课程,应重视实训教学。文章分析了职业学校语文课程不使用实训教学的原因。     

Comparing consumer-produced product reviews across multiple websites with sentiment classification

ABSTRACT

Online consumer reviews have been extensively studied. However, existing literature analyzing online consumer review data mostly relies on a single data source, resulting in potentially biased analytics conclusions. Many websites encourage consumers to post reviews of their purchased products, so that new consumers can evaluate these reviews for the same product across different websites to help them make purchasing decisions. Confusions often arise in this process, because there often exist substantial discrepancies in customer reviews across different retailers on the same product. Clarifying such confusions can help consumers reduce concerns to make up their mind for their purchases, therefore benefiting both consumers and retailers. Through text analytics and sentiment analysis, we comparatively examine the underlying patterns of online consumer reviews of three large retailers including Sears, Home Depot, and Best Buy for a same product. Afterward, we combine online consumer reviews from these large retailers and conduct an overall text analytics and sentiment analysis. The overall results are further compared with the results from individual retailers. The findings show that the sentiment of the online consumer reviews could vary substantially so relying on a single data source to make purchase decision is not a wise idea. Based on the results, we further devise a framework to comparatively examine and integrate multiple data sources for social media analytics of online consumer reviews. This study offers important managerial implications and identifies several new research directions for social media analytics.     

Evaluating museum visitor experiences based on user-generated travel photos

ABSTRACT

This research introduces online travel photos published on social media platforms as a complementary data resource to examine the behavior and experience of museum visitors. The practical value of online travel photos is demonstrated through a case study of popular Hong Kong museums, particularly by using the photo content and metadata available from the Flickr platform. The proposed approach is a generic method for understanding museum visitor behavior and preferences, and supports museum practitioners in developing improved products for visitors. The case study findings are particularly beneficial for tourism managers, especially those in Hong Kong, in promoting and attracting tourists to visit local museums.     

终身学习视角下公共图书馆的转型与发展思考

公共图书馆作为公共文化服务体系的重要组成部分,在构建学习型社会的大背景下,为促进终身学习的理念,借鉴国外图书馆的前沿探索,提升人文素质和知识内涵,实现公共图书馆在新的历史形势下自身的转型与发展。     

基于Android的自主学习软件的研究与实现

本文提出一种基于Android平台的用JAVA语言编写的自主学习软件,该软件安装在Android系统的手机上,用户可以进行在线学习,也能够在有WIFI的情况下提前更新题库后脱机学习,可以让用户利用碎片时间进行学习,真正的达到随时随地进行学习的目的。     

日语自他动词与态相关的误用分析

日语自他动词是日语语法中的一个难点,尤其在和其他语态相关联时使用起来更加有难度.以汉语为母语的日语学习者,常常按照汉语思维习惯去套用日语,出现误用现象.本文从自他动词与被动表现、使役表现和可能表现相关的误用三方面入手,归纳总结中国的日语学习者常见的错误,并从社会文化心理方面探讨产生这些误用的原因,以期帮助中国学生解决有关母语干涉的问题.     

陕北地区土地利用及景观格局变化对生态服务价值的影响*——基于退耕还林（草）背景

［目的］通过揭示退耕还林（草）工程背景下陕北地区近25年生态系统服务价值的演变规律，旨在为陕北地区的土地利用规划及新一轮退耕还林（草）政策的推进提供参考。［方法］以生态环境脆弱的陕北地区为研究对象，基于1990年、2000年、2015年3期的土地利用变化数据，以退耕还林（草）政策的实施为节点，利用土地转移矩阵、景观格局指数、生态服务价值损益表等方法对陕北地区的土地利用情况、景观格局演变以及生态服务价值的变化进行分析，借助相关性系数对土地利用类型、景观格局及生态服务价值之间的关系进行了定量研究。［结果］（1）草地、耕地和林地是陕北地区最主要的土地利用类型，耕地面积减少，林草地面积持续增加且增速加快。（2）近25年，陕北地区景观格局的连接性和通达性降低，景观格局主要呈破碎化发展趋势。研究区各景观类型的破碎化程度增大，空间异质性增加，草地是该地区的优势景观类型。（3）陕北地区1990年、2000年和2015年各类生态系统提供的总生态服务价值分别为38919亿元、39431亿元和40622亿元，退耕还林（草）前年均增长率为1396%，退耕还林（草）后这一比率增加至5622%。［结论］受退耕还林（草）政策的影响，陕北地区土地利用类型和土地景观格局的变化均对生态系统服务价值有显著的影响，但是不同的景观指数对生态系统服务价值的影响程度和趋势不同，水域和林草地面积对生态系统服务价值呈正相关，未利用地和城乡建设用地面积对生态系统服务价值呈负相关。     

Quantile regression for the qualifying match of GEFCom2017 probabilistic load forecasting

We present a simple quantile regression-based forecasting method that was applied in the probabilistic load forecasting framework of the Global Energy Forecasting Competition 2017 (GEFCom2017). The hourly load data are log transformed and split into a long-term trend component and a remainder term. The key forecasting element is the quantile regression approach for the remainder term, which takes into account both weekly and annual seasonalities, such as their interactions. Temperature information is used only for stabilizing the forecast of the long-term trend component. Information on public holidays is ignored. However, the forecasting method still placed second in the open data track and fourth in the definite data track, which is remarkable given the simplicity of the model. The method also outperforms the Vanilla benchmark consistently.     

维吾尔族民众信任的权威格局分析——以四个地区个案为基础的实证研究

权威格局是各种权威要素因地位差异构成的功能互补的社会秩序协调机制，对权威格局的研究是从合法性角度对社会政治稳定必须具备的民众基础的考量。调查结果显示：新疆社会政治稳定具备牢固的维吾尔族民众基础。维吾尔族民众信任的权威格局中。以领导干部为代表的法理型权威在个人和社会事务两个领域普遍受到信任，占据权威格局的主导地位，辅之以在社会事务方面越来越受到信任的知识能力型人才代表的新型权威。经济愈发达的地区，情况愈是如此。宗教人士所代表的传统权威能够发挥的作用主要局限在社会事务领域中的道德规范，在经济欠发达地区的作用相对更大。