针对时空数据库中,移动对象轨迹的连续K近邻查询(continuous K nearest neighbor query,CKNN)的查询效率较低的问题,以及在分布式的移动对象数据库(moving objects databases,MOD)环境下,提升对应查询结果的数据汇聚效率问题进行了研究...针对时空数据库中,移动对象轨迹的连续K近邻查询(continuous K nearest neighbor query,CKNN)的查询效率较低的问题,以及在分布式的移动对象数据库(moving objects databases,MOD)环境下,提升对应查询结果的数据汇聚效率问题进行了研究。在CKNN查询中,设计优化了查询海滩线的更新算法,通过在轨迹数据结构中增加更新标志位,减少了轨迹线段参与的判定运算;同时在假设的类网格覆盖的分布式空间环境下,利用基于Bresenham覆盖的路由汇聚(Bresenham-based overlay for routing and aggregation,BORA)方法,进行查询结果的汇聚;并针对不同近邻参数、轨迹数目、移动对象速度、汇聚方式等对查询时间的影响进行了仿真实验;仿真结果表明,不同参数数值的增加延长了处理时间,基于BORA的汇聚方式比一般的汇聚方式节省了更多的处理时间,提高了系统查询及处理的效率。展开更多
Colombia enjoys considerable ethnic diversity, although its indigenous population, part of the world＇s shared cultural heritage has been reduced by various factors, including displacement, poverty, and poor access to...Colombia enjoys considerable ethnic diversity, although its indigenous population, part of the world＇s shared cultural heritage has been reduced by various factors, including displacement, poverty, and poor access to timely and quality healthcare. The present study is focused on diagnosing health problems, particularly anemia, through a description of hematological findings amongst men and woman aged 18 to 50 years, living at various altitudes, and belonging to several different indigenous communities： the Huitoto and Embera of Caqueta, Florencia; the Born, Muinane, Okaina, Huitoto communities of La Chorrera, Amazonas; and the Yanaconas of Bogota, D.C. Tests performed included automated hemogram tests, ferritin, c-reactive protein, and parasitological assessment to correlate the presence of anemia and parasitism. The authors used a quantitative and transversal, structured, non-experimental, correlational, stratified sample design with 105 samples （51 men, 54 women）. The results showed that 7.8% （4/51） of the men had anemia, compared with 29.6% （16/54） of the women--more than triple the incidence of the male population. Moreover, we found a higher incidence of anemia in rural areas, where the majority of the country＇s indigenous populations live. In the parasitological study, 87.7% （50/57） of the participants tested positive for intestinal parasites. These findings are expected to help authorities implement more effective responses to health issues in these communities.展开更多
A pH-sensor with a pKa value of 5.05 based on 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene（BODIPY） dye was synthesized and demonstrated to be highly sensitive within a pH range of 4.0--6.0 and was highly photostable, ...A pH-sensor with a pKa value of 5.05 based on 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene（BODIPY） dye was synthesized and demonstrated to be highly sensitive within a pH range of 4.0--6.0 and was highly photostable, which makes it a potential pH fluorescent probe. The new pH-sensor will find its application in studying acidic organelles in living cells.展开更多
曾经目睹多少信男善女为了心目中的偶像一掷千金，不惜彻夜站队买演唱会的门票的壮观场面。为的就是一睹偶像的风采。也许有人会说，何必白讨苦吃，在电视上不也可以看到D-57这就是舞台的魅力，是现场感召力所致!在EMMA CHINA 2005巡回...曾经目睹多少信男善女为了心目中的偶像一掷千金，不惜彻夜站队买演唱会的门票的壮观场面。为的就是一睹偶像的风采。也许有人会说，何必白讨苦吃，在电视上不也可以看到D-57这就是舞台的魅力，是现场感召力所致!在EMMA CHINA 2005巡回赛（武汉站）SQC组的比赛中，武汉南贸的参赛车上演了一部“不是舞台胜似舞台”的精彩大片，为广大汽车音响发烧友送来一顿免费的音乐大餐。展开更多
文摘针对时空数据库中,移动对象轨迹的连续K近邻查询(continuous K nearest neighbor query,CKNN)的查询效率较低的问题,以及在分布式的移动对象数据库(moving objects databases,MOD)环境下,提升对应查询结果的数据汇聚效率问题进行了研究。在CKNN查询中,设计优化了查询海滩线的更新算法,通过在轨迹数据结构中增加更新标志位,减少了轨迹线段参与的判定运算;同时在假设的类网格覆盖的分布式空间环境下,利用基于Bresenham覆盖的路由汇聚(Bresenham-based overlay for routing and aggregation,BORA)方法,进行查询结果的汇聚;并针对不同近邻参数、轨迹数目、移动对象速度、汇聚方式等对查询时间的影响进行了仿真实验;仿真结果表明,不同参数数值的增加延长了处理时间,基于BORA的汇聚方式比一般的汇聚方式节省了更多的处理时间,提高了系统查询及处理的效率。
文摘Colombia enjoys considerable ethnic diversity, although its indigenous population, part of the world＇s shared cultural heritage has been reduced by various factors, including displacement, poverty, and poor access to timely and quality healthcare. The present study is focused on diagnosing health problems, particularly anemia, through a description of hematological findings amongst men and woman aged 18 to 50 years, living at various altitudes, and belonging to several different indigenous communities： the Huitoto and Embera of Caqueta, Florencia; the Born, Muinane, Okaina, Huitoto communities of La Chorrera, Amazonas; and the Yanaconas of Bogota, D.C. Tests performed included automated hemogram tests, ferritin, c-reactive protein, and parasitological assessment to correlate the presence of anemia and parasitism. The authors used a quantitative and transversal, structured, non-experimental, correlational, stratified sample design with 105 samples （51 men, 54 women）. The results showed that 7.8% （4/51） of the men had anemia, compared with 29.6% （16/54） of the women--more than triple the incidence of the male population. Moreover, we found a higher incidence of anemia in rural areas, where the majority of the country＇s indigenous populations live. In the parasitological study, 87.7% （50/57） of the participants tested positive for intestinal parasites. These findings are expected to help authorities implement more effective responses to health issues in these communities.
基金Supported by the State Basic Research Project of China(No.2002CB713808)
文摘A pH-sensor with a pKa value of 5.05 based on 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene（BODIPY） dye was synthesized and demonstrated to be highly sensitive within a pH range of 4.0--6.0 and was highly photostable, which makes it a potential pH fluorescent probe. The new pH-sensor will find its application in studying acidic organelles in living cells.
文摘曾经目睹多少信男善女为了心目中的偶像一掷千金，不惜彻夜站队买演唱会的门票的壮观场面。为的就是一睹偶像的风采。也许有人会说，何必白讨苦吃，在电视上不也可以看到D-57这就是舞台的魅力，是现场感召力所致!在EMMA CHINA 2005巡回赛（武汉站）SQC组的比赛中，武汉南贸的参赛车上演了一部“不是舞台胜似舞台”的精彩大片，为广大汽车音响发烧友送来一顿免费的音乐大餐。
