The switchover to digital broadcasting in Korea

This study investigates the development of Korean digital TV transition by tracing the interaction between social and technological entities from various perspectives at different developmental stages. A socio-technical analysis examines the dynamic interactions among the stakeholders in the switchover to digital broadcasting, showing how the various actions taken by leading stakeholders affect diverse groups of stakeholders. The overall findings show that Korean digital TV transition is the outcome of a proactive strategy by industry stakeholders and the Korean government's top–down policy of supporting such a transition. It is argued that the policy of a top–down transition, which overlooks coordination among stakeholders, harms consumers and hinders effective and sustainable development. The case of Korea has implications for other countries that are pursuing digital transition strategies.     

Network effects,trade, and productivity

We consider network effects in the monopolistically competitive model of trade developed by Melitz and Ottaviano (2008). We show that a larger network effect intensifies competition by allowing more‐productive firms to raise prices and earn higher profits, but forcing less‐productive firms to reduce prices and earn lower profits. As a result, low‐productivity firms are driven out of the market. We also show that when network effects are asymmetric, it may be difficult for firms from a country with a small network effect to compete with firms from a country with a large network effect.     

矿粮复合区土地利用冲突强度测算研究——以江西省德兴铜矿和永平铜矿污染区域为例

[目的]矿粮复合区土地利用冲突问题是当前耕地保护与粮食安全领域的热点问题,但长期以来在二元经济结构背景下对农业资源保护的缺位造成了矿粮复合区土地利用冲突问题,最终造成当前矿粮复合区土地利用冲突矛盾不断激化的现状。[方法]该研究通过对江西省德兴铜矿和铅山永平铜矿污染区的田野调查获取数据源,运用土地利用冲突实际补偿(AC)与补偿意愿(WTA)间的缺口来测度冲突强度,通过灰色检验以探查矿粮复合区土地利用冲突强度测算值的正确性,并由此对矿粮复合区土地利用冲突强度加以评定。[结果](1)经测算土地占用损失冲突强度为16.81,房屋损坏冲突强度为62.50,土壤污染冲突强度为2 000.00,饮用水源污染冲突强度为222.22,疾病冲突强度为+∞;(2)当前实际补偿严重缺位,以致造成实际补偿与受偿意愿间的严重脱节,最终造成土地利用冲突强度加剧的现象;(3)当前矿企与地方政府通过寻租行为来规避污染方面的补偿,同时由于农村产权问题的模糊化,为污染排放寻租提供可模糊的"灰色地带",以致形成"公地的悲剧",加剧这些损失领域的土地利用冲突危机;(4)当前对矿粮复合区相关损失的补偿原则忽略了以人为本的根本理念,而更强调从财产视角加以治理与补偿。[结论](1)当前隐性土地利用冲突强度升级,以至于在社会急剧变革的当下隐性冲突集中爆发,由此引发矿粮复合区"社会—生态"可持续发展危机;(2)当前矿粮复合区存在显性冲突补偿,而对隐性冲突弱化的趋势,致使农户根本利益受损,土地利用冲突强度升级;(3)当前矿粮复合区土地利用冲突强度是由空间性、系统性、全局性因素所引发的。     

基于博弈均衡理论的泰山索道问题分析

关于泰山索道建设的讨论已经持续了20多年,至今未有定论.本文从博弈均衡的角度对对是否该建及如何建的问题进行了初步分析.并指出景区旅游供给要素规划作为一种制度安排要发生效力.必须是一种纳什均衡,否则,在实践中不具备操作性.     

应用型影像工程实习实践基地特色建设研究

影像工程专业生产实习目的是培养学生创新思维模式,锻炼学生的实践动手能力,更好的适应社会需要。结合我校的实际情况及用人单位的人才要求,不断加强影像工程实习实践基地的特色建设,灵活调整教学方案,完善特色培养教学模式,培养出更多实用型人才。     

Effectiveness of mobile application for menstrual management of working women in Japan: randomized controlled trial and medical economic evaluation

Abstract

Aims: Hormonal imbalances can affect a woman’s physical and mental condition, impacting her daily life and productivity. A mobile application, “Karada-no-kimochi”, predicts the menstrual cycle based on recorded data, and provides the information regarding menstruation. This study investigates the effectiveness of the application from health condition and labor productivity loss perspectives, and evaluates its cost-effectiveness for employed women in Japan.

Materials and methods: A randomized controlled trial (RCT) was performed to compare the use of the application and non-intervention in female workers (20–45 years) based on an online survey. A discrete-event model based on the RCT data, published literature, and claims data was used for the cost-effectiveness analysis.

Results: The intervention and non-intervention groups comprised 612 and 914 women, respectively. In the intervention group, the incidences of depression (0.16%) and dysmenorrhea (0.33%) were significantly lower than those of the non-intervention group (0.77% and 1.31%, respectively) in the third month. While labor productivity and absenteeism varied, presenteeism showed almost no change across groups. The quality-adjusted life year in the intervention group was 6.84 (0.07 higher than that in the non-intervention group). By analyzing medical expenses and making assumptions regarding productivity, we estimated that the aggregate of medical expenses, productivity loss, and application fee for the intervention group could be lower than that of the non-intervention group by over JPY 130,000 (USD 1,170, as of December 2017) per individual.

Limitations: The subjects included were willing or relatively willing to use the application. Because all outcomes were based on online surveys, the results depended on the objectivity and preciseness of the reports provided by users, and those with severe symptoms might not provide reports.

Conclusions: The results suggest that using the application is cost-effective and might reduce the incidence of dysmenorrhea and depression.     

现代物流配送中心评价体系研究

配送中心一般包括进出货、储存、流通加工、盘点、订单处理、拣货、配送及采购等八项基本作业,而各项作业又关系着人员、设备、设施空间、货品订单、作业规划、效率、成本和品质等八个因素。由此相关性,把八项基本作业作为第二层的作业指标,而影响基本作业的八个因素就构成第三层的评价指标。评价的过程以层次分析法为基础,把第三层的评价指标作为基准,采用由上层至下层的推导方式,即可得到各层指标的计算值。     

中国农户借贷行为：历史演进、内在规律与路径选择

农户借贷行为是农村金融的核心问题之一,是研究农村金融的逻辑起点,现在的农户借贷行为是几千年来历史演进的结晶。然而,令人遗憾的是,从纵向历史演进的角度来研究农户借贷行为并不多见。鉴于此,本文以长期为视角,试图通过研究农户借贷行为的历史演进,进而挖掘其内在规律,发现农户借贷形成了低效率的路径依赖。进一步,本文探讨了制度变迁三要素的变革,认为此种变革是破解低效路径依赖之良方,从而选择合理有效的路径模式。     

科学技术有效流动与区域间非行政壁垒

协同创新要求突破创新主客体间壁垒,促进科学技术的有效流动以充分释放创新要素活力。构建了区域间科学技术流动潜力的引力模型,通过地区间地理距离、经济距离和技术距离矩阵,计算不同区域技术吸收水平,并利用改进的Romer模型计算了科学技术流动的地理壁垒、经济壁垒和技术壁垒。结果表明：①就全国整体而言,地理壁垒的约束作用最强,但在2009年以后弱化。技术壁垒的约束作用最小,在2014年以后有不断扩大的趋势。经济差距壁垒的变化趋势与总壁垒相同,是后期影响科学技术有效流动的最主要因素。中国科学技术流动的总壁垒呈现出在波动中减小的趋势,并先后由地理壁垒、经济壁垒和技术壁垒主导;②从空间上看,阻碍科学技术流动的非行政壁垒的空间分布差异显著,东北及西部沿边地区地理壁垒较为突出,东北、西北和中部地区的经济壁垒更为明显,而技术壁垒则主要集中在华北和西南地区。最后,根据研究结论提出相关政策建议,以促进区域间科学技术高效合理流动。     

环渤海地区汽车产业产学研集成化合作模式探讨

汽车产业是环渤海地区的支柱产业,自主创新是汽车产业发展的关键。实现自主创新的有效途径是集成各方面的资源优势,构建集成化产学研合作模式。环渤海区域已具备产学研集成化合作的条件,实现的途径是建立健全整体运行机制和保障机制。