Location Based Navigation System (LBNS) is a specific Location Based Service (LBS) purely for navigational purpose. These systems resolve position of a user by using GNSS/GPS positioning technologies, to which supplem...Location Based Navigation System (LBNS) is a specific Location Based Service (LBS) purely for navigational purpose. These systems resolve position of a user by using GNSS/GPS positioning technologies, to which supplementary information on goods and services are tagged. The navigation services have become popular and can be installed on mobile phones to provide route information, location of points of interest and user’s current location. LBS has continued to face challenges which include “communication” process towards user reference. Location Based Service System conveys suitable information through a mobile device for effective decision making and reaction within a given time span. This research was geared at understanding the state of LBS technology acceptance and adoption by users in Nairobi Kenya. To do this a quantitative study was carried out through a questionnaire, to investigate mobile phone users’ response on awareness and use of LBS technology. Testing the growth of this technology in this region compared to predictions in previous studies using Technology Acceptance Model (TAM), it is evident that many users may be aware of GPS functionality in mobile phones but are certainly yet to fully embrace the technology as they rarely use it. This points to some underlying challenges towards this technology within this part of the World, thereby recommending for deliberate monitoring and evaluation of LBS technology for sustenance growth based on user satisfaction and acceptance for improved usability.展开更多
目的研究动态增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数分析在早期乳腺癌诊断中的应用价值。方法选取浙江省台州医院2020年6月至2021年6月收治的乳腺癌患者70例为恶性组,另选取同期浙江...目的研究动态增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数分析在早期乳腺癌诊断中的应用价值。方法选取浙江省台州医院2020年6月至2021年6月收治的乳腺癌患者70例为恶性组,另选取同期浙江省台州医院收治的乳腺纤维腺瘤患者30例为良性组,采用DCE-MRI定量参数对乳腺癌和乳腺纤维腺瘤进行鉴别诊断分析,比较两组的DCE-MRI定量参数容量转移常数(volume transfer constant,K^(trans))、反流速率常数(reflux rate constant,K_(ep))、血管外细胞外间隙容积比(volume of the external vascular extracellular space,V_(e)),比较不同病理类型DCE-MRI定量参数K^(trans)、K_(ep)、V_(e)及DCE-MRI定量参数分析与乳腺癌患者预后的相关性及诊断敏感度、准确性。结果良性组的DCE-MRI定量参数K^(trans)、K_(ep)、V_(e)均低于恶性组(P<0.0001);导管内癌组的K^(trans)、K_(ep)、V_(e)及非特殊类型浸润性癌的K^(trans)、K_(ep)、V_(e)均低于特殊类型癌(P<0.05);雌激素受体(estrogen receptor,ER)表达阴性组的K_(ep)高于ER阳性组(P<0.05);孕激素受体(progesterone receptor,PR)阴性组的K_(ep)高于PR阳性组(P<0.05);ER、PR阴性组的K^(trans)、V_(e)高于ER、PR阳性组;人类表皮生长因子受体-2低表达和过表达组的K^(trans)、K_(ep)、V_(e)比较,差异无统计学意义(P>0.05);与K^(trans)、K_(ep)、V_(e)单一诊断比较,联合诊断对乳腺癌诊断价值较高(P<0.05)。结论DCE-MRI定量参数分析用于早期乳腺癌的诊断,能有效鉴别不同疾病的类型及预后,诊断价值较高。展开更多
文摘Location Based Navigation System (LBNS) is a specific Location Based Service (LBS) purely for navigational purpose. These systems resolve position of a user by using GNSS/GPS positioning technologies, to which supplementary information on goods and services are tagged. The navigation services have become popular and can be installed on mobile phones to provide route information, location of points of interest and user’s current location. LBS has continued to face challenges which include “communication” process towards user reference. Location Based Service System conveys suitable information through a mobile device for effective decision making and reaction within a given time span. This research was geared at understanding the state of LBS technology acceptance and adoption by users in Nairobi Kenya. To do this a quantitative study was carried out through a questionnaire, to investigate mobile phone users’ response on awareness and use of LBS technology. Testing the growth of this technology in this region compared to predictions in previous studies using Technology Acceptance Model (TAM), it is evident that many users may be aware of GPS functionality in mobile phones but are certainly yet to fully embrace the technology as they rarely use it. This points to some underlying challenges towards this technology within this part of the World, thereby recommending for deliberate monitoring and evaluation of LBS technology for sustenance growth based on user satisfaction and acceptance for improved usability.
文摘目的研究动态增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数分析在早期乳腺癌诊断中的应用价值。方法选取浙江省台州医院2020年6月至2021年6月收治的乳腺癌患者70例为恶性组,另选取同期浙江省台州医院收治的乳腺纤维腺瘤患者30例为良性组,采用DCE-MRI定量参数对乳腺癌和乳腺纤维腺瘤进行鉴别诊断分析,比较两组的DCE-MRI定量参数容量转移常数(volume transfer constant,K^(trans))、反流速率常数(reflux rate constant,K_(ep))、血管外细胞外间隙容积比(volume of the external vascular extracellular space,V_(e)),比较不同病理类型DCE-MRI定量参数K^(trans)、K_(ep)、V_(e)及DCE-MRI定量参数分析与乳腺癌患者预后的相关性及诊断敏感度、准确性。结果良性组的DCE-MRI定量参数K^(trans)、K_(ep)、V_(e)均低于恶性组(P<0.0001);导管内癌组的K^(trans)、K_(ep)、V_(e)及非特殊类型浸润性癌的K^(trans)、K_(ep)、V_(e)均低于特殊类型癌(P<0.05);雌激素受体(estrogen receptor,ER)表达阴性组的K_(ep)高于ER阳性组(P<0.05);孕激素受体(progesterone receptor,PR)阴性组的K_(ep)高于PR阳性组(P<0.05);ER、PR阴性组的K^(trans)、V_(e)高于ER、PR阳性组;人类表皮生长因子受体-2低表达和过表达组的K^(trans)、K_(ep)、V_(e)比较,差异无统计学意义(P>0.05);与K^(trans)、K_(ep)、V_(e)单一诊断比较,联合诊断对乳腺癌诊断价值较高(P<0.05)。结论DCE-MRI定量参数分析用于早期乳腺癌的诊断,能有效鉴别不同疾病的类型及预后,诊断价值较高。
