Firm entry plays an important role in the industrial transformation of mature resource-based cities.This study describes the industrial evolution of resource-based cities at the firm level and uses kernel density esti...Firm entry plays an important role in the industrial transformation of mature resource-based cities.This study describes the industrial evolution of resource-based cities at the firm level and uses kernel density estimation and econometric models to study the spatiotemporal characteristics and determinants of new firm entry from 2011 to 2019 in four mature resource-based cities.The results are summarized as follows:(1)New resource-based firm entry tends to be natural resource-oriented and path-dependent.The new non-resource-based firms show a high concentration in central urban areas,and the industry types are mainly wholesale and retail of resource products,cultural tourism,and equipment manufacturing.(2)Heterogeneous incumbent firms affect firm entry differently.Affected by competition and agglomeration effects,resource-based and non-resource-based incumbent firms have negative and positive impacts on new resource-based firm entry,respectively.Resourcebased incumbent firm agglomeration positively influences new non-resource-based firm entry.(3)Besides incumbent firms,firm entry can also be affected by multidimensional factors,such as factor costs,economic environment,and institutional environment.Research on new firm entry can better reveal the path dependence and path creation process of the industrial development of resource-based cities from a micro-perspective.展开更多
Hainan boasts unique natural and cultural resources,offering tremendous potential for development in the tourism performance sector.This paper delves into the significance and value of creating a regional brand for Ha...Hainan boasts unique natural and cultural resources,offering tremendous potential for development in the tourism performance sector.This paper delves into the significance and value of creating a regional brand for Hainan’s tourism performances.Based on an analysis of the current state of Hainan’s tourism performance,it explores the challenges faced and proposes a multi-faceted approach to building a regional brand,including resource integration,product innovation,brand communication,and talent cultivation.The aim is to promote high-quality development in Hainan’s tourism performance industry,enhance the cultural appeal and market competitiveness of Hainan’s tourism,and support the construction of Hainan as an international center for tourism consumption.展开更多
Web 2.0时代用户生成内容与人工智能生成内容的叠加,使得常态化的“二次创作”给各国著作权法带来了巨大挑战。由于我国著作权市场已形成了互联网产业对版权产业的全面主导,当前以提高注意义务标准和扩张必要措施范围来应对“二次创作...Web 2.0时代用户生成内容与人工智能生成内容的叠加,使得常态化的“二次创作”给各国著作权法带来了巨大挑战。由于我国著作权市场已形成了互联网产业对版权产业的全面主导,当前以提高注意义务标准和扩张必要措施范围来应对“二次创作”侵权的规制思路难以取得理想效果,反而阻碍了互联网产业传播效率的实现。因此,有必要转换“二次创作”合规治理的传统路径,通过激励产业主体合作的方式,借助授权机制取代侵权治理,进而实现从禁止侵权向鼓励获得授权的转型:一方面应允许网络服务提供者借助技术优势创制新的大规模许可模式;另一方面应将“通知-必要措施”规则、反通知规则与著作权许可合同进行衔接和优化,保障著作权人和网络用户的合法权益不受侵害。展开更多
In a tractor automatic navigation system, path planning plays a significant role in improving operation efficiency. This study aims to create a suboptimal reference course for headland turning of a robot tractor and d...In a tractor automatic navigation system, path planning plays a significant role in improving operation efficiency. This study aims to create a suboptimal reference course for headland turning of a robot tractor and design a path-tracking controller to guide the robot tractor along the reference course. A time-minimum suboptimal control method was used to generate the reference turning course based on the mechanical parameters of the test tractor. A path-tracking controller consisting of both feedforward and feedback component elements was also proposed. The feedforward component was directly determined by the desired steering angle of the current navigation point on the reference course, whereas the feedback component was derived from the designed optimal controller. Computer simulation and field tests were performed to validate the path-tracking performance. Field test results indicated that the robot tractor followed the reference courses precisely on flat meadow, with average and standard lateral devia- tions being 0.031 m and 0.086 m, respectively. However, the tracking error increased while operating on sloping meadow due to the employed vehicle kinematic model.展开更多
基金National Natural Science Foundation of China,No.72050001。
文摘Firm entry plays an important role in the industrial transformation of mature resource-based cities.This study describes the industrial evolution of resource-based cities at the firm level and uses kernel density estimation and econometric models to study the spatiotemporal characteristics and determinants of new firm entry from 2011 to 2019 in four mature resource-based cities.The results are summarized as follows:(1)New resource-based firm entry tends to be natural resource-oriented and path-dependent.The new non-resource-based firms show a high concentration in central urban areas,and the industry types are mainly wholesale and retail of resource products,cultural tourism,and equipment manufacturing.(2)Heterogeneous incumbent firms affect firm entry differently.Affected by competition and agglomeration effects,resource-based and non-resource-based incumbent firms have negative and positive impacts on new resource-based firm entry,respectively.Resourcebased incumbent firm agglomeration positively influences new non-resource-based firm entry.(3)Besides incumbent firms,firm entry can also be affected by multidimensional factors,such as factor costs,economic environment,and institutional environment.Research on new firm entry can better reveal the path dependence and path creation process of the industrial development of resource-based cities from a micro-perspective.
基金Philosophy and Social Planning Project of Haikou City in 2025‘An Exploratory Study on Accelerating the Construction of“International Performing Arts Capital”in Haikou Under the Background of Hainan Free Trade Port’(Project No.:2025-ZCKT-96)。
文摘Hainan boasts unique natural and cultural resources,offering tremendous potential for development in the tourism performance sector.This paper delves into the significance and value of creating a regional brand for Hainan’s tourism performances.Based on an analysis of the current state of Hainan’s tourism performance,it explores the challenges faced and proposes a multi-faceted approach to building a regional brand,including resource integration,product innovation,brand communication,and talent cultivation.The aim is to promote high-quality development in Hainan’s tourism performance industry,enhance the cultural appeal and market competitiveness of Hainan’s tourism,and support the construction of Hainan as an international center for tourism consumption.
基金Project (No. 2006AA10A304) supported by the Hi-Tech Researchand Development Program (863) of China
文摘In a tractor automatic navigation system, path planning plays a significant role in improving operation efficiency. This study aims to create a suboptimal reference course for headland turning of a robot tractor and design a path-tracking controller to guide the robot tractor along the reference course. A time-minimum suboptimal control method was used to generate the reference turning course based on the mechanical parameters of the test tractor. A path-tracking controller consisting of both feedforward and feedback component elements was also proposed. The feedforward component was directly determined by the desired steering angle of the current navigation point on the reference course, whereas the feedback component was derived from the designed optimal controller. Computer simulation and field tests were performed to validate the path-tracking performance. Field test results indicated that the robot tractor followed the reference courses precisely on flat meadow, with average and standard lateral devia- tions being 0.031 m and 0.086 m, respectively. However, the tracking error increased while operating on sloping meadow due to the employed vehicle kinematic model.
