本文以Sci Finder Web的主题检索为例,对数据库蕴含的信息和知识进行了深度探索。简述主题检索的适用对象和信息源CAplus和Medline,比较信息源的标引方式,归纳Sci Finder Web主题检索的方法和技巧。针对后续的文献后处理功能,揭示其各...本文以Sci Finder Web的主题检索为例,对数据库蕴含的信息和知识进行了深度探索。简述主题检索的适用对象和信息源CAplus和Medline,比较信息源的标引方式,归纳Sci Finder Web主题检索的方法和技巧。针对后续的文献后处理功能,揭示其各自特点、应用技巧和异同,旨在提升文献检索的质量和效率,为用户进行正确选择及有效检索提供参考。展开更多
To analyze factors that affect the detection probability of six laser range-finders of rotating rocket,taking a missile as the target,the detection model was established according to a detection mechanism.Based on the...To analyze factors that affect the detection probability of six laser range-finders of rotating rocket,taking a missile as the target,the detection model was established according to a detection mechanism.Based on the model,the detection probability was calculated via Monte Carlo method under different conditions.With the calculation results,the relationship of detection probability with the rolling rate and the missile velocity was illustrated in figures,when the laser emitting frequency was 10 kHz,20 kHz,30 kHz respectively under the condition that rocket met the front of missile as well as the condition that rocket met the rear of missile.The figures show that the detection probability increases as laser emitting frequency increases or the rolling rate increases,while it decreases as the missile velocity increases.Detection probability is higher when rocket meets the front of missile than that when rocket meets the rear of missile.In order to maintain a track of approaching Mach 2 targets,rotation rate should be more than 100 r/s.展开更多
The Internet now is a large-scale platform with big data. Finding truth from a huge dataset has attracted extensive attention, which can maintain the quality of data collected by users and provide users with accurate ...The Internet now is a large-scale platform with big data. Finding truth from a huge dataset has attracted extensive attention, which can maintain the quality of data collected by users and provide users with accurate and efficient data. However, current truth finder algorithms are unsatisfying, because of their low accuracy and complication. This paper proposes a truth finder algorithm based on entity attributes (TFAEA). Based on the iterative computation of source reliability and fact accuracy, TFAEA considers the interactive degree among facts and the degree of dependence among sources, to simplify the typical truth finder algorithms. In order to improve the accuracy of them, TFAEA combines the one-way text similarity and the factual conflict to calculate the mutual support degree among facts. Furthermore, TFAEA utilizes the symmetric saturation of data sources to calculate the degree of dependence among sources. The experimental results show that TFAEA is not only more stable, but also more accurate than the typical truth finder algorithms.展开更多
Curb detection is an important research topic in the unmanned ground robot.In this paper,a novel curb detection method using a 2D laser range finder in an urban environment was presented.In the proposed method,firstly...Curb detection is an important research topic in the unmanned ground robot.In this paper,a novel curb detection method using a 2D laser range finder in an urban environment was presented.In the proposed method,firstly,2D sequential laser range finder data were aligned using a Dead-Reckoning(DR) and GPS localization method based on extended Kalman filter.Secondly,curb points were extracted from multi-frame laser data based on spatial-temporal correlation analysis.Finally,the straight and curved curbs were detected by coordinate axis conversion least square linear fitting method and piecewise weighted least square fitting model respectively.The proposed method can detect both raised and sunken curbs robustly in campus environment.The proposed method has been verified in a real robot platform.展开更多
日前，巴斯夫全新的Pigment Finder（意为：颜料搜索）App上线，涂料、塑料和印刷等行业的颜料专业人士现在可以通过Pigment Finder App快速搜索最适合的颜料解决方案。这款App提供了关于颜料的概况信息．包括色度、色彩指数、化学成分...日前，巴斯夫全新的Pigment Finder（意为：颜料搜索）App上线，涂料、塑料和印刷等行业的颜料专业人士现在可以通过Pigment Finder App快速搜索最适合的颜料解决方案。这款App提供了关于颜料的概况信息．包括色度、色彩指数、化学成分以及关于主要功能和技术数据的详细信息。展开更多
In formulating an approach to the climate crisis,the cultural institutions should redefine their neutral position,or rather define whether the term“neutral”juxtaposes the climate crisis with human freedom projects r...In formulating an approach to the climate crisis,the cultural institutions should redefine their neutral position,or rather define whether the term“neutral”juxtaposes the climate crisis with human freedom projects related to race or gender.Maintaining neutrality as an overall principle,I argue a cultural political approach as a part of the agenda set in cultural institutions,both political and ethical,by reading an attempt by Pierre Bourdieu to engage the cultural field in not letting economics undermine its independency,and later through Walter Benjamin’s view on the thorough reader.By connecting Benjamin to Julia Kristeva’s use of Freud’s theory on the unnameable as a phobia,having to be treated in other terms than the“greenwashing of language”undertaken by politicians and social engineers,the cultural institutions could get onto the peloton and act as a path finder.Although funded and supported,cultural institutions have the advantage of a non-profit service to communities who seek information,entertainment,and tools,not having to compete on an open marked.展开更多
Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this ...Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this work, an extrema identification that is totally independent of derivative-based approaches and independent of quantitative attributes is introduced. For three consecutive positive terms arranged in a line, the ratio (R) of the sum of the maximum and minimum to the sum of the three terms is always 2/n, where n is the number of terms and 2/3 ≤ R ≤ 1 when n = 3. R > 2/3 implies that one term is away from the other two terms. Applying suitable modifications for the above stated hypothesis, the method was developed and the method is capable of identifying peaks and valleys in any signal. Furthermore, three techniques were developed for filtering non-dominating, sharp, gradual, low and high extrema. Especially, all the developed methods are non-parametric and suitable for analyzing processes that have dynamic nature such as biogas data. The methods were evaluated using automatically collected biogas data. Results showed that the extrema identification method was capable of identifying local extrema with 0% error. Furthermore, the non-parametric filtering techniques were able to distinguish dominating, flat, sharp, high, and low extrema in the biogas data with high robustness.展开更多
文摘本文以Sci Finder Web的主题检索为例,对数据库蕴含的信息和知识进行了深度探索。简述主题检索的适用对象和信息源CAplus和Medline,比较信息源的标引方式,归纳Sci Finder Web主题检索的方法和技巧。针对后续的文献后处理功能,揭示其各自特点、应用技巧和异同,旨在提升文献检索的质量和效率,为用户进行正确选择及有效检索提供参考。
文摘To analyze factors that affect the detection probability of six laser range-finders of rotating rocket,taking a missile as the target,the detection model was established according to a detection mechanism.Based on the model,the detection probability was calculated via Monte Carlo method under different conditions.With the calculation results,the relationship of detection probability with the rolling rate and the missile velocity was illustrated in figures,when the laser emitting frequency was 10 kHz,20 kHz,30 kHz respectively under the condition that rocket met the front of missile as well as the condition that rocket met the rear of missile.The figures show that the detection probability increases as laser emitting frequency increases or the rolling rate increases,while it decreases as the missile velocity increases.Detection probability is higher when rocket meets the front of missile than that when rocket meets the rear of missile.In order to maintain a track of approaching Mach 2 targets,rotation rate should be more than 100 r/s.
基金supported by the National Natural Science Foundation of China(61472192)the Scientific and Technological Support Project(Society)of Jiangsu Province(BE2016776)
文摘The Internet now is a large-scale platform with big data. Finding truth from a huge dataset has attracted extensive attention, which can maintain the quality of data collected by users and provide users with accurate and efficient data. However, current truth finder algorithms are unsatisfying, because of their low accuracy and complication. This paper proposes a truth finder algorithm based on entity attributes (TFAEA). Based on the iterative computation of source reliability and fact accuracy, TFAEA considers the interactive degree among facts and the degree of dependence among sources, to simplify the typical truth finder algorithms. In order to improve the accuracy of them, TFAEA combines the one-way text similarity and the factual conflict to calculate the mutual support degree among facts. Furthermore, TFAEA utilizes the symmetric saturation of data sources to calculate the degree of dependence among sources. The experimental results show that TFAEA is not only more stable, but also more accurate than the typical truth finder algorithms.
基金National Natural Science Foundation of China(No.61603184)the Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information(Nanjing University of Science and Technology),Ministry of Education,China(No.30920140122006)the Fundamental Research Funds for the Central Universities,China(No.30915011321)
文摘Curb detection is an important research topic in the unmanned ground robot.In this paper,a novel curb detection method using a 2D laser range finder in an urban environment was presented.In the proposed method,firstly,2D sequential laser range finder data were aligned using a Dead-Reckoning(DR) and GPS localization method based on extended Kalman filter.Secondly,curb points were extracted from multi-frame laser data based on spatial-temporal correlation analysis.Finally,the straight and curved curbs were detected by coordinate axis conversion least square linear fitting method and piecewise weighted least square fitting model respectively.The proposed method can detect both raised and sunken curbs robustly in campus environment.The proposed method has been verified in a real robot platform.
文摘In formulating an approach to the climate crisis,the cultural institutions should redefine their neutral position,or rather define whether the term“neutral”juxtaposes the climate crisis with human freedom projects related to race or gender.Maintaining neutrality as an overall principle,I argue a cultural political approach as a part of the agenda set in cultural institutions,both political and ethical,by reading an attempt by Pierre Bourdieu to engage the cultural field in not letting economics undermine its independency,and later through Walter Benjamin’s view on the thorough reader.By connecting Benjamin to Julia Kristeva’s use of Freud’s theory on the unnameable as a phobia,having to be treated in other terms than the“greenwashing of language”undertaken by politicians and social engineers,the cultural institutions could get onto the peloton and act as a path finder.Although funded and supported,cultural institutions have the advantage of a non-profit service to communities who seek information,entertainment,and tools,not having to compete on an open marked.
文摘Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this work, an extrema identification that is totally independent of derivative-based approaches and independent of quantitative attributes is introduced. For three consecutive positive terms arranged in a line, the ratio (R) of the sum of the maximum and minimum to the sum of the three terms is always 2/n, where n is the number of terms and 2/3 ≤ R ≤ 1 when n = 3. R > 2/3 implies that one term is away from the other two terms. Applying suitable modifications for the above stated hypothesis, the method was developed and the method is capable of identifying peaks and valleys in any signal. Furthermore, three techniques were developed for filtering non-dominating, sharp, gradual, low and high extrema. Especially, all the developed methods are non-parametric and suitable for analyzing processes that have dynamic nature such as biogas data. The methods were evaluated using automatically collected biogas data. Results showed that the extrema identification method was capable of identifying local extrema with 0% error. Furthermore, the non-parametric filtering techniques were able to distinguish dominating, flat, sharp, high, and low extrema in the biogas data with high robustness.
