1,720,971 research outputs found
Augmenting Imbalanced Time-series Data via Adversarial Perturbation in Latent Space
No full textSuccess of training deep learning models largely depends on the amount and quality of training data. Although numerous data augmentation techniques have already been pro- posed for certain domains such as computer vision where simple schemes such as rotation and flipping have been shown to be effective, other domains such as time-series data have a relatively smaller set of augmentation techniques readily available. Besides, data imbalance is a phenomenon that is often observed in real-world data. However, a simple oversampling may make a model vulnerable to overfitting, so a proper data augmentation is desired. To tackle these problems, we propose a data augmentation method that utilizes latent vectors of an autoencoder in a novel way. When input data is perturbed in its latent space, the reconstructed input data retains similar properties to the original one. On the other hand, adversarial augmentation is a technique to train robust deep neural networks against un- foreseen data shifts or corruptions by providing a downstream model with difficult samples to predict. Our method adversarily perturbs input data in its latent space so that the aug- mented data is diverse and conducive to reducing test error of a downstream model. The experimental results demonstrate that our method achieves a right balance in significantly modifying the input data to help generalization while keeping the realism of it
Quatro plus plus : Robust global registration exploiting ground segmentation for loop closing in LiDAR SLAM
No full textGlobal registration is a fundamental task that estimates the relative pose between two viewpoints of 3D point clouds. However, there are two issues that degrade the performance of global registration in LiDAR SLAM: one is the sparsity issue and the other is degeneracy. The sparsity issue is caused by the sparse characteristics of the 3D point cloud measurements in a mechanically spinning LiDAR sensor. The degeneracy issue sometimes occurs because the outlier-rejection methods reject too many correspondences, leaving less than three inliers. These two issues have become more severe as the pose discrepancy between the two viewpoints of 3D point clouds becomes greater. To tackle these problems, we propose a robust global registration framework, called Quatro++. Extending our previous work that solely focused on the global registration itself, we address the robust global registration in terms of the loop closing in LiDAR SLAM. To this end, ground segmentation is exploited to achieve robust global registration. Through the experiments, we demonstrate that our proposed method shows a higher succeiasdsss rate than the state-of-the-art global registration methods, overcoming the sparsity and degeneracy issues. In addition, we show that ground segmentation asdasd asignificantly helps to idfdfsncrease the success rate for the ground vehicles. Finally, we apply our proposed method to the loop clossdasdlksajing modulasdse in LiDAR SLAM and confirm that the quality of the loop constraints is improved, showing more precise mapping results. Therefore, the experimental evidence corroborated the suitabilitiasdasdy of our method as an initial alignment in the loop closing. Our code is available at https://quatro-plusplus.github.io.
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Online Political Communication and Platform Effect: Busan City Homepage Case
No full text본 연구는 소통 구조인 플랫폼효과에 주목하여 전자정부 플랫폼과 전자거버넌스 플랫폼에 따른 커뮤니케이션 차이를 분석하였다. 전자정부 플랫폼은 시민이 말하고 정부가 듣는 1:1 소통구조이기 때문에 정부가 소통을 통제하고 시민의 공론적 참여가 제한을 받는다. 반면에 전자거버넌스 플랫폼은 시민 다수가 말하고 듣는 다수:다수 소통구조로서 공론화 가능성이 높다. 이러한 가설을 부산시 홈페이지중 부산시에 바란다와 정책포럼의 글들을 비교 분석하여 검증하였다. 정책포럼에 게시된 글들의 공개비율은 68%였고, 부산시에 바란다의 경우에는 52%였다. 또한, 공론장 수준에서 정책포럼에 게시된 글들이 부산시에 바란다의 글들보다 글의 논리성, 관계성, 그리고 공론으로서의 수렴 가능성이 높았다. 시민들은 전자거버넌스 플랫폼에서 좀 더 공개적이고 논리적이며, 서로를 존중하며, 공론으로 수렴하는 글들을 더 많이 작성하였다. 이러한 결과는 전자민주주의를 실현하는 데 있어서 인터넷 소통구조인 플랫폼이 갖는 중요성을 알려준다. 정부와 시민 사이의 정치 소통은 시민의 행위와 함께 정부가 어떤 플랫폼을 설계하고 운영하는가에 영향을 받는다.The factors that affect the Internet political participation are classified into the two; one related to agency and the other to structure. By comparing the e-government platform and the e-governance platform, this study exclusively focuses on Platform Effect, one of the structural factors of the Internet political participation, which has long been neglected by many scholars. On E-government platform, because of its unique one to one structure that the government listens to what citizens say, the government tends to control the entire communications and citizens have restrictions in participating in public sphere. On E-governance platform, by contrast, it is more likely that citizens successfully develop the public sphere since multiple numbers of citizens talk to and listen to each other simultaneously. These Platform hypotheses have been applied to two online participation platforms in Busan City Homepage. The results show that the proportion of publicly opened opinion postings on e-governance platform, Jeong-Chaek Forum is greater than that on e-government platform, Busan-si-e-ba-ran-da by 68% to 52%. As for the degree to which the public sphere has been developed, if evaluated by opinions posted on these two platforms, e-governance platform is higher than e-government platform in dimensions of logic, relationship, and compromise. The results of this study suggest that communicative platform is important in realizing the e-democracy. In particular, the role of e-governance platform is so crucial for e-democracy that it should be considered as important as citizens choices. In conclusion, if a government intends to drive citizen vigorous participation in public sphere, it should design e-governance platform
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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