A simple depression-filling method for raster and irregular elevation datasets     

Pin-Chun Huang  Kwan Tun Lee 《Journal of Earth System Science》2015,124(8):1653-1665

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Affecting Geospatial Technologies: Toward a Feminist Politics of Emotion*   总被引：1，自引：0，他引：1  

Mei‐Po Kwan 《The Professional geographer》2007,59(1):22-34

Building on earlier contributions to feminist understanding of geospatial technologies (GT), I seek to further develop feminist perspectives on GT along new directions. I argue that an attention to the importance of affect (feelings and emotions) and the performative nature of GT practices offers a distinctive critical edge to feminist work on GT. I emphasize the need for GT practitioners to contest the dominant meanings and uses of GT, and to participate in struggles against the oppressive or violent effects of these technologies. I argue that only when emotions, feelings, values, and ethics become an integral part of our geospatial practices can we hope that the use of GT will lead to a less violent and more just world.  相似文献   

Application of a second-order paraxial boundary condition to problems of dynamics of circular foundations on a porous layered half-space     

Jin Ho Lee  Jae Kwan Kim  John L. Tassoulas 《Soil Dynamics and Earthquake Engineering》2011

A half-space finite element and a consistent transmitting boundary in a cylindrical coordinate system are developed for analysis of rigid circular (or cylindrical) foundations in a water-saturated porous layered half-space. By means of second-order paraxial approximations of the exact dynamic stiffness for a half-space in plane-strain and antiplane-shear conditions, the corresponding approximation for general three-dimensional wave motion in a Cartesian coordinate system is obtained and transformed in terms of cylindrical coordinates. Using the paraxial approximations, the half-space finite element and consistent transmitting boundary are formulated in a cylindrical coordinate system. The development is verified by comparison of dynamic compliances of rigid circular foundations with available published results. Examination of the advantage of the paraxial condition vis-á-vis the fixed condition shows that the former achieves substantial gain in computational effort. The developed half-space finite element and transmitting boundary can be employed for accurate and effective analysis of foundation dynamics and soil–structure interaction in a porous layered half-space.  相似文献   

定性GIS在时空间行为研究中的应用   总被引：1，自引：1，他引：0  

关美宝  谷志莲  塔娜  柴彦威 《地理科学进展》2013,32(9):1316-1331

定性GIS已经成为地理学混合研究方法的重要组成部分,通过扎根理论并与可视化结合、GIS和民族志整合等途径,对时空间行为研究产生了深远的影响。其通过文本或非文本质性材料与GIS地理特征的整合,形成了时空行为研究中独特的地理环境系统与空间机制分析,一个重要的前沿领域就是地理叙事在时间地理学研究中的应用。时间地理学是研究人类时空行为的重要视角,但由于对个体主观性及行为的社会文化因素的相对忽视等原因,受到了一定的质疑。近年来以GIS为代表的地理空间技术的定性分析与表达,为时间地理学融入质性分析提供了方法论基础。关美宝创建的基于GIS的地理叙事方法,通过借鉴叙事分析的一般方法尤其是三维叙事空间分析,结合时间地理学概念框架,开发了基于GIS平台的计算机辅助叙事分析组件(3D-VQGIS),实现了在GIS内可视化的、循环交互的叙事分析,为定性GIS发展中GIS与叙事分析方法的融合做出了贡献。将地理叙事方法用于时空行为研究,可以为时间地理学方法创造一个更便于理解与解释研究对象日常行为的地理环境,为其融入行为与主体的质性分析提供从数据整合、数据分析到解释与展示的一整套研究方法与具体操作工具。  相似文献   

超越地理学二元性: 混合地理学的思考   总被引：4，自引：3，他引：1  

关美宝 《地理科学进展》2013,32(9):1307-1315

20世纪的地理学经历了“空间-分析”地理学和“社会-文化”地理学的分裂,对学科的发展带来了持久的影响。本文从历史角度探究“空间-分析”地理学和“社会-文化”地理学分裂的原因,提出保持地理学观点的多样性、促进不同领域的沟通是地理学学科发展的理性选择。在实现“空间-分析”地理学与“社会-文化”地理学沟通的方式方面,地理学认识论与研究方法之间并不存在一一对应的关系,定量方法与定性方法可以在不同领域中混合使用,从而实现对社会-理论与空间-分析隔阂的超越。本文阐释了“混合性”的理念在超越地理学社会-文化/空间-分析二元性中所具备的潜质,并简要总结了混合地理学已有的研究实践,对以“混合性”为基础、面向“后社会-理论、后空间-分析”的地理学未来进行了展望。  相似文献   

A rigorous probabilistic seismic hazard model for Southeast China: a case study of Hong Kong     

J. W. Pappin  R. C. H. Koo  H. Jiang  J. S. H. Kwan  Y. B. Yu  M. M. L. So  Y. K. Shiu  K. K. S. Ho  W. K. Pun 《Bulletin of Earthquake Engineering》2015,13(12):3597-3623

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Using GIS and perceived distance to understand the unequal geographies of healthcare in lower-income urban neighbourhoods   总被引：2，自引：0，他引：2  

Hawthorne TL  Kwan MP 《The Geographical journal》2012,178(1):18-30

Geographers play important roles in public health research, particularly in understanding healthcare accessibility, utilisation, and individual healthcare experiences. Most accessibility studies have benefited from the increased sophistication of geographic information systems (GIS). Some studies have been enhanced with semi-structured in-depth interviews to understand individual experiences of people as they access healthcare. However, few accessibility studies have explicitly utilised individual in-depth interview data in the construction of new GIS accessibility measures. Using mixed methods including GIS analysis and individual data from semi-structured in-depth interviews, we offer satisfaction-adjusted distance as a new way of conceptualising accessibility in GIS. Based on fieldwork in a predominantly lower-income community in Columbus, Ohio (USA), we find many residents felt neighbourhood healthcare facilities offered low-quality care, which suggested an added perceived distance as they attempt to access high-quality healthcare facilities. The satisfaction-adjusted distance measure accounts for the perceived distance some residents feel as they search for high-quality healthcare in lower-income urban neighbourhoods. In moving beyond conventional GIS and re-conceptualising accessibility in this way, we offer a more realistic portrayal of the issues lower-income urban residents face as they attempt to access high-quality healthcare facilities. The work has theoretical implications for conceptualising healthcare accessibility, advances the mixed-methodologies literature, and argues for a more equitable distribution of high-quality healthcare in urban neighbourhoods.  相似文献   

TBT toxicity on the marine microalga Nannochloropsis oculata   总被引：1，自引：0，他引：1  

Sidharthan M  Young KS  Woul LH  Soon PK  Shin HW 《Marine pollution bulletin》2002,45(1-12):177-180

Commercial antifouling formulations containing TBT are the major source of organotin contamination in coastal waters. In view of the persisting TBT residues (13 ng Sn l⁻¹) in the coastal waters of South Korea, an attempt has been made to evaluate the growth response and biochemical composition of laboratory-cultured Nannochloropsis oculata to TBT toxicity. It is evident that the persisting concentration level of TBT is high enough to cause adverse effect on the microalgal species. The EC₅₀ (24 h) was found to be at 0.89 nM level of TBT for this marine eustigmatophyte N. oculata. Photosynthetic pigment content was significantly affected. At elevated TBT concentrations of 1.0 nM, especially pronounced changes in biochemical composition was found. TBT tolerance of N. oculata and its growth as well as biochemical responses are discussed.  相似文献   

Spatiotemporal modelling of rainfall-induced landslides using machine learning     

Ng  C. W. W.  Yang  B.  Liu  Z. Q.  Kwan  J. S. H.  Chen  L. 《Landslides》2021,18(7):2499-2514

Landslides - Natural terrain landslides are mainly triggered by rainstorms in Hong Kong, which pose great threats to life and property. To mitigate landslide risk, building a prediction model which...  相似文献   

Transmitting boundary for water-saturated transversely isotropic strata based on the u–U formulation     

Jin Ho Lee  Jae Kwan Kim 《Soil Dynamics and Earthquake Engineering》2009

A new transmitting boundary in a cylindrical coordinate system has been developed for modeling the elastic waves radiating out to an infinite boundary in water-saturated transversely isotropic soil strata over a rigid bedrock. The saturated soil strata are assumed to consist of a porous material and modeled as a transversely isotropic two-phase medium, based on the u−U formulation. The newly developed transmitting boundary is combined with the finite-elements model of the near-field region, using the same u−U formulation, and applied to the study of the dynamics of a rigid circular foundation in porous isotropic or transversely isotropic layered strata, either fully or partly saturated with water. The verification and application examples give valuable insights into new and interesting aspects of the dynamic behavior of rigid circular foundations in fully or partly saturated two-phase ground in terms of permeability, transverse anisotropy, and ground-water table level.  相似文献