117,307 research outputs found
A Multi-Modal Feedback Communication Interface for Human Working Posture Adjustments
No full textThis paper studies non-physical feedback mechanisms to guide human workers toward ergonomic body postures. Specifically, the focus is to solve the tasks that involve no direct physical interaction between the human and the robotic system, therefore tactile guidance by the robot body is not feasible. We propose a multi-modal ergonomic posture guidance system that comprises visual feedback and speech-based audio feedback. We hypothesise that the proposed multi-modal system leads to better performance compared to uni-modal feedback systems when trying to guide users from one pose to another. To test the hypothesis we conducted an experiment that compared conditions with only audio feedback, only visual feedback and multi-modal feedback. In addition, we examined speech-based audio guidance in joint space and in endpoint space. The results showed that the speech-based feedback in joint space came out as the preferred audio feedback due to its ability to allow users to carry out efficient and coordinated inter-joint movements, especially in cases of high redundancy. Furthermore, the proposed multi-modal feedback system was superior compared to the other feedback modalities both in terms of objective measures and subjective measures.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Human-Robot Interactio
Towards multi-modal intention interfaces for human-robot co-manipulation
No full textPeternel L, Tsagarakis N, Ajoudani A. Towards multi-modal intention interfaces for human-robot co-manipulation. In: IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE; 2016: 2663-2669
Adaptation of robot physical behaviour to human fatigue in human-robot co-manipulation
No full textPeternel L, Tsagarakis N, Caldwell D, Ajoudani A. Adaptation of robot physical behaviour to human fatigue in human-robot co-manipulation. In: Humanoid Robots (Humanoids), 2016 IEEE-RAS 16th International Conference on. IEEE; 2016: 489-494
Effect of prolonged stationary phase on selected strains of bacteria Lactobacillus
No full textMlečnokislinske bakterije iz rodu Lactobacillus so komercialno pomembne in jih lahko uporabljamo kot probiotike. Laktobacili v probiotičnih pripravkih so pred zaužitjem pogosto dlje časa izpostavljeni stacionarni fazi. Namen naše magistrske naloge je bil proučiti morebitne metabolne spremembe, ki bi nastale tekom podaljšane stacionarne faze. Poleg osmih sevov Lactobacillus, smo uporabili tudi dva seva Pediococcus acidilactici, sev Enterococcus faecalis ter sev E. coli. Ugotovili smo, da večina uporabljenih sevov dobro preživi stacionarno fazo, če se uporabi ustrezno gojišče. Preživetje pa je tudi sevno specifična lastnost. Pri dolgotrajno staranih kulturah smo opazili spremembe v metabolizmu sladkorjev, kot tudi spremembe v občutljivosti na žolč. Razlike so bile vidne tako na nivoju sevov kot tudi na nivoju različno dolgo staranih kultur. V sklopu magistrske naloge smo proučevali tudi aktivnost β-galaktozidaze pri sevih Lactobacillus, Pediococcus in Enterococcus. Do povečanja aktivnosti encima po preživetju stacionarne faze je prišlo samo v enem primeru pri predstavniku E. faecalis. Pomembna lastnost probiotikov je občutljivost na klinično pomembne vrste antibotikov, zato smo proučevali tudi morebitne spremembe v odpornosti po dolgotrajni stacionarni fazi. Opazili smo, da se v nekaj primerih laktobacilom poveča odpornost proti antibiotikom, če so izpostavljeni stresu stacionarne faze. Najpogosteje smo opazili odpornost proti kanamicinu. Prednost v rasti v stacionarni fazi (GASP) smo med proučevanimi tremi sevi zaznali le pri sevu L. plantarum KR6. Opazili smo šibek fenotip GASP ob ko-kultivaciji z bakterijami vrste Escherichia coli.Lactic acid bacteria of Lactobacillus genus are commercially relevant bacteria used also as probiotics. Lactobacilli in probiotic products are often exposed to prolonged stationary phase before they are ingested. In this thesis we focused on survival and metabolic changes and adaptive strategies during stationary phase. Eight strains of Lactobacillus species, two Pediococcus acidilactici strains, one strain of Enterococcus faecalis and one strain of E. coli were used. Majority of strains were able to survive stationary phase in high numbers, when appropriate medium was used. Results showed that survival is strain specific trait. Exposing strains to prolonged stationary phase leaded to changes in ability to grow on a specific sugar and bile sensitivity. Again changes were strain specific and dependent on the time spent in the stationary phase. Activity of β-galactosidase was also studied in this thesis. Boost of enzymes activity was seen in strain E. faecalis S1-17. Sensitivity to clinically relevant antibiotics is important trait of probiotics, therefore we tested whether changes in resistance appear after exposure to prolonged stationary phase. In some cases we noticed increase in antibiotic resistance after exposure to stationary phase. The most prevalent was resistance to kanamycin. We detected growth advantage in stationary phase (GASP) in one out of three tested L. plantarum strains. L. plantarum KR6 displayed weak GASP phenotype in mixed culture experiment with E. coli
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
After a Decade of Teleimpedance: A Survey
No full textDespite the significant progress made in making robots more intelligent and autonomous, today, teleoperation remains a dominant robot control paradigm for the execution of complex and highly unpredictable tasks. Attempts have been made to make teleoperation systems stable, easy to use, and efficient in terms of physical interactions between the follower remote robot and the environment. In particular, the emergence of torque-controlled robots has permitted to regulate the interaction forces from a distance through direct force or impedance control, enabling them to engage in complex interaction tasks. Exploiting this feature, the concept of teleimpedance control was introduced as an alternative method to bilateral force-reflecting teleoperation. The aim was to create a feed-froward yet contact-efficient teleoperation by enriching the leader commands with desired impedance profiles while executing a task. Since then, the teleimpedance concept has found its way into a wide range of interface and controller designs, as well as application domains. Accordingly, after a decade of research progress, this survey aims to provide: first, a convenient introduction of the concept to new researchers in the field, second, consolidate the existing state-of-the-art for active researchers, third, and discuss the pros and cons of different methods in terms of interface and force feedback to provide guidelines for different applications and future developments. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Human-Robot Interactio
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
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