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The TripleSat constellation:a new geospatial data service model

Geo-Spatial Information Science 2017年第2期20卷 163-173页

作者： Qiang Wen Jianjun He Shengyong Guan Ting Chen Yin Hu Wenbin Wu Feng Liu Yuexia Qiao suet yheng kok Samuel Yeong 21st Century Aerospace Technology Co. Ltd.BeijingChina 21st Century Aerospace Technology(Asia)Pte.Ltd. Singapore

With the increase of different sensors,applications and customers,the demand from data providers and users is for a new geospatial data service model,which supports low cost,high dexterity,and which would provide a comprehensive *** on such requirements and demands,the 21AT TripleSat constellation terminal and data delivery and management system has been developed by a Beijing based high-tech enterprise,Twenty First Century Aerospace Technology Co.,Ltd.(21AT).The company is the first commercial Earth observation satellite operator and service provider in *** new geospatial data service model allows the user to directly access multi-source satellite data,manage the data order,and carry out automatic massive data production and *** solution also implements safe and hierarchical user management,statistical data analysis,and automatic information *** addition,a mobile application is also available for users to easily access system *** new geospatial solution has already been successfully applied and installed in many customer sites in China,and is now available globally for international clients interested in fast geospatial *** enables the success of customers’operational *** providing TripleSat Constellation images,the multi-source data access system also allows the users to access other satellite data sources,based on customized *** paper describes and discusses this new geospatial data service model.

关键词： Geospatial data service model 21AT TripleSat constellation geospatial instant service system

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Echocardiographic mapping of left ventricular resynchronization during cardiac resynchronization therapy procedures

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Chinese Medical Journal 2010年第13期123卷 1645-1651页

作者： CHAN Ngai-yin CHOY Chi-chung CHEUNG Kar-chun LAU Chun-leung LO Ying-keung CHU Pui-shan YUEN Ho-chuen LAU suet-ting CHOI Yuen-choi Department of Medicine & Geriatrics Princess Margaret Hospital 2-10 Princess Margaret Hospital Road Lai Chi Kok Kowloon Hong Kong China

Background Cardiac resynchronization therapy （CRT） is an effective electrical therapy for patients with moderate to severe heart failure and cardiac dyssynchrony. This study aimed to investigate the degree of acute left ventricular （LV） resynchronization with biventricular pacing （BVP） at different LV sites and to examine the feasibility of performing transthoracic echocardiography （TTE） to quantify acute LV resynchronization during CRT procedure. Methods Fourteen patients with NYHA Class Ⅲ-Ⅳ heart failure, LV ejection fraction 〈35%, QRS duration 〉120 ms and septal-lateral delay （SLD）〉60 ms on tissue Doppler imaging （TDI）, underwent CRT implant. TDI was obtained from three apical views during BVP at each accessible LV site and SLD during BVP was derived. Synchronicity gain index （Sg） by SLD was defined as （I＋（SLD at baseline - SLD at BVP）/SLD at baseline）. Results Seventy-two sites were studied. Positive resynchronization （R＋, Sg〉1） was found in 42 （58%） sites. R＋ was more likely in posterior or lateral than anterior LV sites （66% vs. 36%, P 〈0.001）. Concordance of empirical LV lead implantation sites and sites with R＋ was 50% （7/14）. Conclusions The degree of acute LV resynchronizaUon by BVP depends on LV lead location and empirical implantation of LV lead results in only 50% concordance with R＋. Performing l-rE during CRT implantation is feasible to identify LV sites with positive resynchronization.

关键词： echocardiography cardiac resynchronization therapy heart failure left ventricular lead device implantation optimization

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