98 results on '"multiple systems"'
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2. 新型城镇化视域下安徽省碳排放网络建构研究.
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宣 蔚, 张 雯, 赵 静, 陆妍霏, and 赵力伟
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Copyright of Resources Development & Market is the property of Sichuan Resource Development & Market Magazine Co., Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2024
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3. Optimal operation of multiple integrated energy systems based on a hybrid Taguchi‐compact salp swarm algorithm
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Yang Fu, Jie Shan, Zhenkun Li, and Bolin Xie
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compact technique ,integrated energy system ,multiple systems ,salp swarm algorithm ,Taguchi method ,Renewable energy sources ,TJ807-830 - Abstract
Abstract With the rapid development of integrated energy system (IES), it has become a trend to form multiple integrated energy systems (MIESs) in a certain region. However, there is a lack of coordination and cooperation among MIESs. This paper proposes an optimal operation model of MIESs with four cost objectives, which focuses on energy interaction among MIESs. As a non‐linear and large optimization problem, it is difficult for conventional mathematical methods to solve. Hence, this paper proposes a hybrid Taguchi‐compact salp swarm algorithm (TCSSA). The compact technique can save the operation memory of model. Taguchi method can improve the convergence speed and solution accuracy of model. The proposed algorithm is tested on 28 benchmark functions and applied to optimal operation of MIESs. Results demonstrate that: (1) compared with other famous algorithms, TCSSA can provide more efficient execution and better solutions. (2) The optimal operation of MIESs based on TCSSA can achieve the complementary of energy advantages, which effectively reduces the total cost of MIESs (up to 9.67%).
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- 2023
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4. Optimal operation of multiple integrated energy systems based on a hybrid Taguchi‐compact salp swarm algorithm.
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Fu, Yang, Shan, Jie, Li, Zhenkun, and Xie, Bolin
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HYBRID systems ,TAGUCHI methods ,ALGORITHMS ,ENERGY development - Abstract
With the rapid development of integrated energy system (IES), it has become a trend to form multiple integrated energy systems (MIESs) in a certain region. However, there is a lack of coordination and cooperation among MIESs. This paper proposes an optimal operation model of MIESs with four cost objectives, which focuses on energy interaction among MIESs. As a non‐linear and large optimization problem, it is difficult for conventional mathematical methods to solve. Hence, this paper proposes a hybrid Taguchi‐compact salp swarm algorithm (TCSSA). The compact technique can save the operation memory of model. Taguchi method can improve the convergence speed and solution accuracy of model. The proposed algorithm is tested on 28 benchmark functions and applied to optimal operation of MIESs. Results demonstrate that: (1) compared with other famous algorithms, TCSSA can provide more efficient execution and better solutions. (2) The optimal operation of MIESs based on TCSSA can achieve the complementary of energy advantages, which effectively reduces the total cost of MIESs (up to 9.67%). [ABSTRACT FROM AUTHOR]
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- 2023
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5. Rural Resilience and Mobility: A Scoping Review.
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Adisaputri, Gianisa, Khan, Anam, Cameranesi, Margherita, and Ungar, Michael
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RURAL population , *COMMUNITY involvement , *RURAL geography - Abstract
Many rural communities are facing diverse and multiple stressors that require constant recovery, adaptation, and engagement in processes of transformation at multiple systemic levels to maintain their resilience. As economic, social, and environmental conditions changed, one factor associated with this resilience has been mobility into and out of rural areas. The objective of this scoping review is to map the existing literature on the relationship between human mobility and rural resilience, with attention to the range of systems that influence mobility patterns and the successful coping of rural populations under stress. The results show that climate exposure is the main stressor for rural populations, while leaving rural areas is a common adaptative strategy. Several co-occurring protective factors on individuals, households, and community resiliences were also identified. The interconnectedness of protective factors and the significance of each protective factor across time are crucial factors to policymakers considering strategies to improve the resilience of newcomers and rural populations. [ABSTRACT FROM AUTHOR]
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- 2023
6. A Multi-Master Single-Slave Teleoperation System Through Composite State Convergence
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Asad, Muhammad Usman, Gu, Jason, Farooq, Umar, Dey, Rajeeb, Adhikary, Nabanita, Datta, Rupak, Chang, Chunqi, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Gu, Jason, editor, Dey, Rajeeb, editor, and Adhikary, Nabanita, editor
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- 2022
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7. Short-term effects of intravitreal anti-vascular endothelial growth factor agents on body weight and multiple systems after treatment for retinopathy of prematurity
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Jing Chen, Qingfei Hao, Jing Zhang, Yanna Du, Haoming Chen, and Xiuyong Cheng
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body weight gain ,intravitreal anti-VEGF ,multiple systems ,retinopathy of prematurity ,ranibizumab ,aflibercept ,Pediatrics ,RJ1-570 - Abstract
ObjectivesThis study's goal was to assess the short-term effect on body weight and multiple systems following intravitreal injections of ranibizumab and aflibercept for retinopathy of prematurity (ROP).MethodsWe retrospectively assessed infants with ROP who received intravitreal anti-vascular endothelial growth factor agents (VEGF) treatment at our hospital. They were classified into 2 groups based on the drugs administered: the intravitreal ranibizumab (IVR) group and the intravitreal aflibercept (IVA) group. The body weight (BW) gains for the pre-treatment week, the 1st week after treatment, and the 2nd week after treatment were compared for each group. Additionally, other parameters such as blood pressure, heart rate, oxygen concentration, volume of milk and output of urine at four time points were also measured. We used repeated measurement analysis of variance analyzed these data.ResultsIn total, 95 preterm infants were recruited, including 51 cases in the IVR group and 44 cases in the IVA group. The BW gain for the 1st week after treatment was significantly lower than the pre-treatment week in each group (P
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- 2023
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8. The Role of the Excluded.
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Minati, Gianfranco
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PHILOSOPHICAL anthropology , *QUANTUM entanglement , *HUMANITY , *QUANTUM theory , *HUMAN beings , *SUPERFICIALITY , *HINDUISM - Abstract
We consider the peculiarity of unique events, such as those of a natural, evolutionary, and social nature. In particular, we consider unique social events that have had either the claim or the vocation of being salvific for humanity, such as the introduction over time of the Torah, Hinduism, Buddhism, Christianity, and Islam. We question how the claimed, general salvific vocation contrasts, or is inconsistent with, the non-retroactive temporality and locality of such events, which could not have happened otherwise. This undeclared and philosophically unsolved inconsistency then reappears in subsequent cultural contradictions and inadequacies, political and social allowances such as, for instance, homo-centrism and a pathological relation with Nature. In the case of Christianity, this inconsistency is represented by the painting reproduced in the article, a work in which the excluded humans and other living beings are represented as astonished by the occurrence in this moment, and in such an unnatural context. Furthermore, we consider the original understanding as related to concepts of classical physics, or of such concepts naively adopted within the texts considered sacred. However, in some religions, such as Christianity, the inconsistency is theologically solved. We stress the need to update the ancient original elementary, naïve, pre-classic philosophical and conceptual frameworks used so that these alleged inconsistencies and contradictions may be not only theologically solved, but also conceptually solved in more complex understandings of the world, for example, considering relativistic time, long-range interdependence, quantum entanglement, and theories of the universe. Without this update, the unique saving events can affect only religiously, that is, optionally, on the scientific and philosophical conceptions used. Without this adjustment, homo-centrist illusion and egoism prevail as the natural, linear consequential attitude without raising these questions. It rather assumes that the intervention is for involved human beings, and moreover for those who have had and are lucky enough to receive and practice it, ignoring the enormous inconsistency within the message itself, and its presumed general and available salvific nature. This requires theological, philosophical, and scientific interdisciplinarity. The theme concerns inconsistencies within and superficiality of the narratives and their treatment of the unique, salvific events, without any reference to possible general and retroactive effects of how these events are represented in the painting. We conclude that the subject should be debated by taking into account contemporary understandings, such as relativistic space and time, quantum physics, and of the universe, with new philosophical and anthropological approaches. This should be a matter of responsible philosophical and theological interdisciplinary debate involving science, suitable to establish new understandings. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Resolution of infertility following hydatid cyst removal: a case report.
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Warasna HJM, Abuzaina KN, Fakhouri SN, Shahin FBY, Awad BYH, Awad MYH, Banat MA, and Smerat MI
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Introduction and Importance: Human echinococcosis, also known as 'hydatid cyst,' constitutes a zoonotic parasitic disease attributed to Echinococcus granulosus or Echinococcus multilocularis . Primary afflictions occur in the liver and lungs, whilst the implication of alternative organs remains infrequent. The clinical presentation can vary, and large cysts may cause compression symptoms and complications. This case involved a 21-year-old Palestinian female with three large hydatid cysts in the liver, causing compression of adjacent structures and unique clinical manifestations., Case Presentation: A female aged 21 arrived with signs of heart palpitations, shortness of breath, tiredness, and pain in the right upper abdomen, alongside a background of infertility. During routine pre-IVF ultrasound, three liver hydatid cysts were unexpectedly found, leading to a referral to the surgical department. Laboratory tests and imaging confirmed this diagnosis. The surgery involved cyst aspiration, hypertonic saline injection, and marsupialization. Post-surgical complications were managed as they occurred. The symptoms lessened afterward, and a successful pregnancy was achieved 9 months post-surgery., Clinical Discussion: Zoonotic infection by cystic echinococcosis (CE) primarily engages the liver and lungs. The progression of symptoms is contingent upon cyst placement and resultant pressure on adjacent tissues. Diagnosis requires imaging alongside serological assays, while large cysts necessitate surgical intervention., Conclusion: The presented case underscores the complexity of managing multiple extensive liver hydatid cysts, highlighting the necessity to consider hydatid disease amidst patients presenting with indeterminate symptoms, particularly within endemic zones. An extensive surgical strategy produced positive outcomes, illustrating the significance of prompt intervention for symptom alleviation and sustained patient health., Competing Interests: The authors declare no conflict of interest.Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article., (Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc.)
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- 2024
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10. Hazard Analysis on a System of Systems using the Hazard Ontology
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Adach, Malina, Ali, Nazakat, Hänninen, Kaj, Lundqvist, Kristina, Adach, Malina, Ali, Nazakat, Hänninen, Kaj, and Lundqvist, Kristina
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Today, well-established hazard analysis techniques are available and widely used to identify hazards for single systems in various industries. However, hazard analysis techniques for a System of Systems (SoS) are not properly investigated. SoS is a complex system where multiple systems work together to achieve a common goal. However, the interaction between systems may lead to unforeseen interactions and interdependencies between systems. This increases the difficulty of identifying and assessing system failures and potential safety hazards. In this paper, we explore whether Hazard Ontology (HO) can be applied to an SoS and whether it can identify emergent hazards, their causes, sources, and consequences. To conduct our exploration, we apply the HO to a quarry automation site (an SoS) from the construction equipment domain. The results indicate that the HO is a promising technique that facilitates the identification of emergent hazards and their components.
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- 2023
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11. Two-stage bandwidth-allocated algorithm for multi-subsystem-based VPON in metro-access optical network.
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Wang, Xingdi, Gan, Chaoqin, and Xia, Weidong
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In the metro-access optical network, a two-stage bandwidth-allocated algorithm is proposed for the multi-subsystem-based virtual passive optical network (VPON) that can achieve the syncretism of multiple systems such as time division multiplexing-PON, wavelength division multiplexing-PON and orthogonal frequency division multiplexing-PON. In this paper, the bandwidth is allocated in two stages. The first-stage allocation is designed to improve the admission probability of new VPONs by allocating bandwidth to all new VPONs followed by original VPONs. Meanwhile, to avoid the bandwidth being monopolized by the new VPONs, the bandwidth allocated to each VPON is no more than its guaranteed bandwidth. Therefore, the whole fairness can be guaranteed. The second-stage allocation is used to promote the bandwidth-utilized ratio by assigning the remaining bandwidth to VPONs whose demand is not fully met in the first stage. With the two-stage allocation, not only the admission probability can be improved, but also the bandwidth-utilized ratio can be promoted. MATLAB is used to evaluate the performance of proposed algorithm according to admission probability of new VPONs and bandwidth-utilized ratio. [ABSTRACT FROM AUTHOR]
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- 2018
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12. Pulmonary Langerhans cell histiocytosis and multiple system involvement: A case report
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Lin Luo and Yan-Xia Li
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Hypothyroidism ,Multiple systems ,Case report ,Diabetes insipidus ,General Medicine ,Pulmonary Langerhans cell histiocytosis - Abstract
BACKGROUND Pulmonary Langerhans cell histiocytosis (PLCH) is a relatively rare type of lung disease, common in middle-aged smoking men. It is characterized by proliferation and infiltration of Langerhans cells, and the formation of multiple parabronchial mesenchymal nodules in lung tissue, and may lead to organ dysfunction. There are no typical symptoms and signs, and it is easily misdiagnosed or missed, and therefore deserves clinical attention and further discussion. CASE SUMMARY We describe the case of a nonsmoking 46-year-old man with PLCH diagnosed based on clinical manifestations of fever and dry cough, with a history of hypothyroidism and diabetes insipidus for 9 years. Computed tomography (CT)- and CT-guided puncture examinations revealed no abnormalities, and he ultimately underwent thoracoscopic biopsy to confirm the diagnosis. The pathological diagnosis was PLCH. Thyroid function was maintained by medication. Pituitary magnetic resonance imaging showed that the pituitary stalk had become thinner. CONCLUSION LCH often involves multiple systems. Moreover, the pathogenesis is not clear, clinical manifestations lack specificity, and diagnosis requires special attention. Diagnosis of PLCH can significantly benefit from comprehensive multidisciplinary analysis.
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- 2021
13. Analysis and comparison of three unsupervised learning clustering methods for GNSS multipath signals
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ZHU Bin, YANG Cheng, and LIU Yan
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fcm ,Mathematical geography. Cartography ,multiple systems ,gmm ,GA1-1776 ,multipath signals ,k-means++ ,unsupervised clustering - Abstract
In urban environments, the GNSS signals could be easily blocked and reflected by buildings, which leads to low positioning accuracy and discontinuity. This paper employs k-means++, Gaussian mixed clustering (GMM) and fuzzy c-means (FCM) clustering methods to separate the line-of-sight signals (LOS), multi-path and non-line-of-sight signals (NLOS). The pseudorange residuals, signal-to-noise ratio, elevation angle, as well as pseudorange rate consistency are considered in the three methods. The performance comparisons of the three methods are carried out by static testing of GPS/BDS integrated system in known position point. The results show that FCM has the greatest silhouette coefficient and the best clustering performance. The positioning performance is therefore been greatly improve by eliminating the NLOS. The root mean squares error (RMSE) of point positioning indicates that positioning results can be improved by 50% after NLOS been eliminated by k-means++ and FCM. Compared with the supervised clustering methods, the unsupervised clustering is easy to implement without prior information, has lower computation burden and has certain advantages in improving the positioning accuracy.
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- 2021
14. How Do Patients and Providers React to Different Incentives in the Chinese Multiple Health Security Systems?
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Chun-Yu Zhang and Hideki Hashimoto
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Different Behaviors ,Financial Incentives ,Government Monitoring ,Multiple Systems ,Medicine - Abstract
Background: China has achieved universal health insurance coverage. This study examined how patients and hospitals react to the different designs of the plans and to monitoring of patients by the local authority in the Chinese multiple health security schemes. Methods: The sample for analysis consisted of 1006 orthopedic inpatients who were admitted between January and December 2011 at a tertiary teaching hospital located in Beijing. We conducted general linear regression analyses to investigate whether medical expenditure and length of stay differed according to the different incentives. Results: Patients under plans with lower copayment rates consumed significantly more medication compared with those under plans with higher copayment rates. Under plans with an annual ceiling for insurance coverage, patients spent significantly more in the second half of the year than in the first half of the year. The length of stay was shorter among patients when there were government monitoring and a penalty to the hospital service provider. Conclusions: Our results indicate that the different designs and monitoring of the health security systems in China cause opportunistic behavior by patients and providers. Reformation is necessary to reduce those incentives, and improve equity and efficiency in healthcare use.
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- 2015
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15. Can explicit processes support implicit category learning?: The effect of relevant rule-oriented selective attention on implicit learning
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Sanchez, Andres
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- Categorization, Multiple systems, COVIS, Explicit learning, Implicit learning
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Categorization is a crucial component of human cognition. Multiple systems theories suggest categories can be learned by explicit or implicit processes/systems depending on the type of category (e.g., Ashby & Valentin, 2017). Research examining the interaction between these systems found that explicit learning impairs implicit performance (Ashby & Crossley, 2010; Crossley & Ashby, 2015; Sanchez et al., 2020). The nature of this impairment remains unclear. The current study examined the effect of selective attention to rule dimensions that were either relevant or irrelevant to a later implicit categorization task to better understand how this impairment occurs. The results suggested that attention to relevant dimensions is crucial for implicit learning. Both systems can learn in parallel as long as the relevant category information is attended. This suggests the primary mechanism of implicit impairment by the explicit system may be drawing attention away from relevant information rather than rule-based strategy perseveration.
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- 2023
16. The Development of Dialectical Thinking As An Approach to Integration
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Michael Basseches
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Higher Education ,transformation ,development ,dialectic ,constitutive relationships ,interaction ,multiple systems ,open systems ,metasystematic ,epistemic adequacy ,dialectical thinking ,dialectical philosophical perspective ,dialectical analysis ,psychotherapy ,Michael Basseches ,Social Sciences ,Social sciences (General) ,H1-99 - Abstract
This article offers a description of dialectical thinking as a psychological phenomenon that reflects adult intellectual development. While relating this psychological phenomenon to the various dialectical philosophical perspectives from which the description is derived, the article conceptualizes dialectical thinking as a form of organization of thought, various aspects of which can be identified in individual adults’ approaches to conceptualizing a range of problems, rather than as one particular stream of intellectual history. The article provides a range of examples of dialectical analyses, contrasting them with more formalistic analyses, in order to convey the power, adequacy, and significance of dialectical thinking for the sorts of challenges that this journal embraces. It suggests that events in all areas of life demand recognition of the limitations of closed-system approaches to analysis. Approaches based instead on the organizing principle of dialectic integrate dimensions of contradiction, change and system-transformation over time in a way that supports people’s adaptation when structures under girding their sense of self/world coherence are challenged. Higher education and psychotherapy are considered as examples of potential contexts for adult intellectual development, and the conditions that foster such development in these contexts are discussed. The article as a whole makes the case for consciously attempting to foster such development in all our work as an approach to integration.
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- 2005
17. Ego Depletion Interferes with Rule-Defined Category Learning but Not Non-Rule-Defined Category Learning
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John Paul eMinda and Rahel eRabi
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Categorization ,Self regulation ,category learning ,multiple systems ,Ego Depletion ,COVIS ,Psychology ,BF1-990 - Abstract
Considerable research on category learning has suggested that many cognitive and environmental factors can have a differential effect on the learning of rule-defined categories as opposed to the learning of non-rule-defined categories. Prior research has also suggested that ego depletion can temporarily reduce the capacity for executive functioning and cognitive flexibility. The present study examined whether temporarily reducing participants’ executive functioning via a resource depletion manipulation would differentially impact rule-defined and non-rule-defined category learning. Participants were either asked to write a story with no restrictions (the control condition), or without using two common letters (the ego depletion condition). Participants were then asked to learn either a set of rule-defined categories or a set of non-rule-defined categories. Resource depleted participants performed more poorly than controls on the rule-defined task, but did not differ from controls on the non-rule-defined task, suggesting that self regulatory resources are required for successful rule-defined category learning. These results lend support to multiple systems theories and clarify the role of self-regulatory resources within this theory.
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- 2015
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18. Single-side etching for on-demand and versatile liquid diodes with opposite wettability in multiple systems.
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Deng, Wanshun, Wang, Gang, Zeng, Zhixiang, and Ren, Tianhui
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SEMICONDUCTOR lasers , *DIODES , *PENETRATION mechanics , *WETTING , *LIQUIDS , *ETCHING - Abstract
[Display omitted] • Facile preparation of opposite wettability in air, under water and under oil. • Achievement of on-demand liquid diodes in multiple systems. • Experimental and theoretical exploration in unidirectional liquid penetration. • Versatile liquid diodes used in fog collection, droplet capture and immiscible liquids' separation. To achieve smart control of liquid penetration, liquid diodes have been widely studied in the recent years. However, most liquid diodes can only achieve opposite wettability in one or two systems, resulting in the loss of unidirectional liquid transportation property after they are wetted by immiscible liquids. This shortcoming will highly restrain the application areas of liquid diodes. Herein, a two-step single-side etching strategy have been adopted to develop opposite wettability on reverse sides of single-layered meshes. Opposite wettability forms not only in air but also under various liquids such as water and oil to realize unidirectional liquid penetration in these systems. More importantly, varied thickness of lyophobic layer was found to be crucial in liquid transportation in different systems, which was further demonstrated by the analysis of Laplace pressure on various meshes. Besides, the obtained liquid diodes were also competent in fog collection, liquid capture and oil/water separation, exhibiting great versatility. Thus, our findings not only propose on-demand and versatile liquid diodes but can also enlighten further study in smart valves in different systems. [ABSTRACT FROM AUTHOR]
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- 2023
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19. The accretion variability in the young multiple system WX Cha
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Fiorellino, Eleonora, Zsidi ,Gabriella, Kóspál, Ágnes, and Ábrahám, Péter
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Stellar Astrophysics ,Accretion ,Astrophysics::High Energy Astrophysical Phenomena ,Star formation ,Multiple systems ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Variability ,Astrophysics::Galaxy Astrophysics ,Young stellar objects - Abstract
One of the main contributor to the photometric variability of pre-main sequence stars is the mass accretion rate, which regulates the interplay between the forming star and the protoplanetary disk. In multiple systems, the accretion scenario is furthermore complicated by the interaction of the components, and by the eventual presence of a circumbinary disk. The multiple system WX Cha, composed of three young stellar objects, is one of the best candidates to investigate the accretion rates to study how the photometric variability is related to the accretion process in multiple systems. We collected high resolution spectroscopy (ESO2.2/FEROS + VLT/ESPRESSO) in 7 different epochs, as well as ground-based and spaceborne (TESS) multi-epoch VIS/IR photometry of the young multiple system WXCha. The multi-wavelength light curves exhibit quasi-periodic variability of about 0.5 mag. Analysing the TESS light curve, we found a significant period of 9.6 days, which we assign to one of the orbital periods in the system (Fig. 1). We studied the variability of selected emission lines (Fig. 2) that trace the accretion, to compute the accretion luminosity with empirical relations (Alcalà+2017). We computed accretion luminosity and mass accretion rate for each epoch (Fig. 3) by measuring our flux calibrated spectra, taking stellar parameters from the literature (Daemgen+13). Our preliminary data show that WX Cha is accreting as a rate typical of TTauri stars system. Daily changes in the accretion luminosity can explain the photometric variability, and the extinction can be considered constant. The relative contributions of the three stellar components to the accretion will be the topic of further studies.  
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- 2021
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20. State-Trace Analysis: Dissociable Processes in a Connectionist Network?
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Yeates, Fayme, Wills, Andy J., Jones, Fergal W., and McLaren, Ian P. L.
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DEPENDENT variables , *LEARNING curve , *COMPUTER simulation , *INDEPENDENT variables , *DIMENSIONAL analysis , *MONOTONIC functions - Abstract
Some argue the common practice of inferring multiple processes or systems from a dissociation is flawed (Dunn, 2003). One proposed solution is state-trace analysis (Bamber, 1979), which involves plotting, across two or more conditions of interest, performance measured by either two dependent variables, or two conditions of the same dependent measure. The resulting analysis is considered to provide evidence that either (a) a single process underlies performance (one function is produced) or (b) there is evidence for more than one process (more than one function is produced). This article reports simulations using the simple recurrent network ( SRN; Elman, 1990) in which changes to the learning rate produced state-trace plots with multiple functions. We also report simulations using a single-layer error-correcting network that generate plots with a single function. We argue that the presence of different functions on a state-trace plot does not necessarily support a dual-system account, at least as typically defined (e.g. two separate autonomous systems competing to control responding); it can also indicate variation in a single parameter within theories generally considered to be single-system accounts. [ABSTRACT FROM AUTHOR]
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- 2015
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21. MODELING THE 360° INNOVATING FIRM AS A MULTIPLE SYSTEM OR COLLECTIVE BEING.
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BOUCHARD, VÉRONIQUE
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INNOVATIONS in business ,TECHNOLOGICAL innovations ,FORMAL organization ,BUSINESS planning ,SYSTEMS theory - Published
- 2008
22. Learning categories via rules and similarity: Comparing adults and children.
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Rabi, Rahel, Miles, Sarah J., and Minda, John Paul
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PSYCHOLOGY of learning , *RULES , *SIMILARITY (Psychology) , *CHILD psychology , *PSYCHOLOGY of adults , *PERCEPTUAL learning , *PERFORMANCE & psychology - Abstract
Two experiments explored the different strategies used by children and adults when learning new perceptual categories. Participants were asked to learn a set of categories for which both a single-feature rule and overall similarity would allow for perfect performance. Other rules allowed for suboptimal performance. Transfer stimuli (Experiments 1 and 2) and single features (Experiment 2) were presented after training to help determine how the categories were learned. In both experiments, we found that adults made significantly more optimal rule-based responses to the test stimuli than children. Children showed a variety of categorization styles, with a few relying on the optimal rules, many relying on suboptimal single-feature rules, and only a few relying on overall family resemblance. We interpret these results within a multiple systems framework, and we argue that children show the pattern they do because they lack the necessary cognitive resources to fully engage in hypothesis testing, rule selection, and verbally mediated category learning. [ABSTRACT FROM AUTHOR]
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- 2015
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23. MULTI-SYSTEM COUPLING VIBRATION OF A DISTRIBUTED ELECTRIC-DRIVE AGRICULTUAL VEHICLE.
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Jin, C., Wei, J., Sun, H., and Yin, Y.
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AGRICULTURAL equipment , *VIBRATION measurements , *DRIVE shafts , *ELECTRIC vehicles , *ELECTRIC drives - Abstract
To ensure riding comfort, vibration generated by engine, drive system and ground need to be considered in designing an agricultural vehicle. This study examines multi-body dynamics model of an agricultural vehicle, and focuses on the distributed electric-drive agricultural vehicle. To simulate the response of an electric-drive agricultural vehicle to vibrations excited by the drive motors, engine and road roughness, this study proposes a vibration model of a distributed electric-drive agricultural vehicle that has 11 degrees of freedom and coupled excitation sources. The model was derived from vehicle dynamics equations and solved numerically employing fast Fourier transform. The model was validated in experiments on a real distributed electric-drive agricultural vehicle. Simulations and experiments showed that the amplitude of low-frequency vibration of the cab was increased by simultaneous excitations, which could not be ignored. This result is useful for the design of the suspension component and overall design of agricultural machinery. [ABSTRACT FROM AUTHOR]
- Published
- 2015
24. Determining the probability of cyanobacterial blooms: the application of Bayesian networks in multiple lake systems.
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Rigosi, Anna, Hanson, Paul, Hamilton, David P., Hipsey, Matthew, Rusak, James A., Bois, Julie, Sparber, Karin, Chorus, Ingrid, Watkinson, Andrew J., Qin, Boqiang, Kim, Bomchul, and Brookes, Justin D.
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CYANOBACTERIAL blooms ,EFFECT of temperature on algae ,WATER temperature ,CLIMATE change ,PHOSPHORUS in water ,PLANT nutrition ,BAYESIAN analysis - Abstract
A Bayesian network model was developed to assess the combined influence of nutrient conditions and climate on the occurrence of cyanobacterial blooms within lakes of diverse hydrology and nutrient supply. Physicochemical, biological, and meteorological observations were collated from 20 lakes located at different latitudes and characterized by a range of sizes and trophic states. Using these data, we built a Bayesian network to (1) analyze the sensitivity of cyanobacterial bloom development to different environmental factors and (2) determine the probability that cyanobacterial blooms would occur. Blooms were classified in three categories of hazard (low, moderate, and high) based on cell abundances. The most important factors determining cyanobacterial bloom occurrence were water temperature, nutrient availability, and the ratio of mixing depth to euphotic depth. The probability of cyanobacterial blooms was evaluated under different combinations of total phosphorus and water temperature. The Bayesian network was then applied to quantify the probability of blooms under a future climate warming scenario. The probability of the "high hazardous'' category of cyanobacterial blooms increased 5% in response to either an increase in water temperature of 0.8°C (initial water temperature above 24°C) or an increase in total phosphorus from 0.01 mg/L to 0.02 mg/L. Mesotrophic lakes were particularly vulnerable to warming. Reducing nutrient concentrations counteracts the increased cyanobacterial risk associated with higher temperatures. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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25. State-trace analysis can be an appropriate tool for assessing the number of cognitive systems: A reply to Ashby (2014).
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Dunn, John, Kalish, Michael, and Newell, Ben
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- *
CATEGORIZATION (Psychology) , *PSYCHOMETRICS , *ANALYSIS of variance , *COGNITIVE analysis , *MATHEMATICAL models , *COGNITIVE psychology - Abstract
Ashby () has argued that state-trace analysis (STA) is not an appropriate tool for assessing the number of cognitive systems, because it fails in its primary goal of distinguishing single-parameter and multiple-parameter models. We show that this is based on a misunderstanding of the logic of STA, which depends solely on nearly universal assumptions about psychological measurement and clearly supersedes inferences based on functional dissociation and the analysis of interactions in analyses of variance. We demonstrate that STA can be used to draw inferences concerning the number of latent variables mediating the effects of a set of independent variables on a set of dependent variables. We suggest that STA is an appropriate tool to use when making arguments about the number of cognitive systems that must be posited to explain behavior. However, no statistical or inferential procedure is able to provide definitive answers to questions about the number of cognitive systems, simply because the concept of a 'system' is not defined in an appropriate way. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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26. Developing Representations of Compound Stimuli
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Ingmar eVisser and Maartje E. J. Raijmakers
- Subjects
category learning ,multiple systems ,rule-based representation ,similarity-based representation ,strategy analysis ,Psychology ,BF1-990 - Abstract
Classification based on multiple dimensions of stimuli is usually associated with similarity-based representations, whereas uni-dimensional classifications are associated with rule-based representations. This paper studies classification of stimuli and category representations in school-aged children and adults when learning to categorize compound, multidimensional stimuli. Stimuli were such that both similarity-based and rule-based representations would lead to correct classification. This allows testing whether children have a bias for formation of similarity-based representations. The results are at odds with this expectation. Children use both uni-dimensional and multidimensional classification, and the use of both strategies increases with age. Multidimensional classification is best characterized as resulting from an analytic strategy rather than from procedural processing of overall-similarity. The conclusion is that children are capable of using complex rule-based categorization strategies that involve the use of multiple features of the stimuli.
- Published
- 2012
- Full Text
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27. Spiral arms and instability within the AFGL 4176 mm1 disc
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Johnston, K. G., Hoare, M. G., Beuther, H., Kuiper, R., Kee, N. D., Linz, H., Boley, P., Maud, L. T., Ahmadi, A., Robitaille, T. P., Johnston, K. G., Hoare, M. G., Beuther, H., Kuiper, R., Kee, N. D., Linz, H., Boley, P., Maud, L. T., Ahmadi, A., and Robitaille, T. P.
- Abstract
We present high-resolution (30 mas or 130 au at 4.2 kpc) Atacama Large Millimeter/submillimeter Array observations at 1.2 mm of the disc around the forming O-type star AFGL 4176 mm1. The disc (AFGL 4176 mm1-main) has a radius of ∼1000 au and contains significant structure, most notably a spiral arm on its redshifted side. We fitted the observed spiral with logarithmic and Archimedean spiral models. We find that both models can describe its structure, but the Archimedean spiral with a varying pitch angle fits its morphology marginally better. As well as signatures of rotation across the disc, we observe gas arcs in CH3CN that connect to other millimetre continuum sources in the field, supporting the picture of interactions within a small cluster around AFGL 4176 mm1-main. Using local thermodynamic equilibrium modelling of the CH3CN K-ladder, we determine the temperature and velocity field across the disc, and thus produce a map of the Toomre stability parameter. Our results indicate that the outer disc is gravitationally unstable and has already fragmented or is likely to fragment in the future, possibly producing further companions. These observations provide evidence that disc fragmentation is one possible pathway towards explaining the high fraction of multiple systems around high-mass stars. © ESO 2020.
- Published
- 2020
28. Constraining multiple systems with GAIA
- Author
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Beauvalet, L., Lainey, V., Arlot, J.-E., Bancelin, D., Binzel, R.P., and Marchis, F.
- Subjects
- *
ARTIFICIAL satellites , *ASTEROIDS , *GRAVITY , *PLANETS , *PARAMETER estimation , *SOLAR system - Abstract
Abstract: GAIA will provide observations of some multiple asteroid and dwarf systems. These observations are a way to determine and improve the quantification of dynamical parameters, such as the masses and the gravity fields, in these multiple systems. Here we investigate this problem in the cases of Pluto''s and Eugenia''s system. We simulate observations reproducing an approximate planning of the GAIA observations for both systems, as well as the New Horizons observations of Pluto. We have developed a numerical model reproducing the specific behavior of multiple asteroid system around the Sun and fit it to the simulated observations using least-square method, giving the uncertainties on the fitted parameters. We found that GAIA will improve significantly the precision of Pluto''s and Charon''s mass, as well as Petit Prince''s orbital elements and Eugenia''s polar oblateness. [Copyright &y& Elsevier]
- Published
- 2012
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29. Optimal control data scheduling with limited controller-plant communication
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Xu, Jiapeng, Wen, Chenglin, and Xu, Daxing
- Published
- 2018
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30. The Effects of Concurrent Verbal and Visual Tasks on Category Learning.
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Miles, Sarah J. and Minda, John Paul
- Subjects
- *
LEARNING , *VERBAL ability , *SHORT-term memory , *COGNITION , *PSYCHOLOGY - Abstract
Current theories of category learning posit separate verbal and nonverbal learning systems. Past research suggests that the verbal system relies on verbal working memory and executive functioning and learns rule-defined categories: the nonverbal system does not rely on verbal working memory and learns non-rule-defined categories (E. M. Waldron & F. G. Ashby, 2001; D. Zeithamova & W. T. Maddox, 2(X)6). However, relatively little research has explored the importance of visual working memory or visual processing for either system. The authors investigated the role of working memory (Experiment 1a and 1b), visual processing (Experiment 2), and executive functioning for each system, using a concurrent task methodology. It was found that visual tasks with high executive functioning demands and verbal tasks with high or low executive demands disrupted rule-defined learning, whereas any visual task, regardless of executive functioning demand, disrupted non-rule-defined learning. Taken together, these results confirm the importance of verbal working memory and executive functioning for the verbal system and provide new evidence for the importance of visual processing for the nonverbal system. These results help to clarify understanding of the nonverbal system and have implications for multiple systems theories of category learning (F. G. Ashby, L. A. Alfonso-Reese, A. U. Turken, & E. M. Waldron, 1998). [ABSTRACT FROM AUTHOR]
- Published
- 2011
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31. Removing the Frontal Lobes: The Effects of Engaging Executive Functions on Perceptual Category Learning.
- Author
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Filoteo, J. Vincent, Lauritzen, Scott, and Maddox, W. Todd
- Subjects
- *
MEMORY , *LEARNING , *SHORT-term memory , *DECISION making , *SOCIAL interaction - Abstract
The present study examined the impact of engaging frontal-mediated working memory processes on implicit and explicit category learning. Two stimulus dimensions were relevant to categorization, but in some conditions, a third, irrelevant dimension was also presented. Results indicated that in both implicit and explicit conditions, the inclusion of the irrelevant dimension impaired performance by increasing the reliance on suboptimal unidimensional strategies. With three-dimensional stimuli, a striking dissociation was observed between implicit and explicit category learning when participants performed a sequential working memory task. With explicit category learning, performance was impaired further, and there was an increased use of suboptimal unidimensional strategies. However, with implicit category learning, the performance impairment decreased, and there was an increased use of optimal strategies. These findings demonstrate the paradoxical situation in which learning can be improved under sequential-task conditions and have important implications for training, decision making, and understanding interactive memory systems. [ABSTRACT FROM PUBLISHER]
- Published
- 2010
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32. Learning Rule-Described and Non-Rule-Described Categories: A Comparison of Children and Adults.
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Minda, John Paul, Desroches, Amy S., and Church, Barbara A.
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- *
LEARNING ability , *LEARNING , *COGNITION , *COMPREHENSION , *CHILDREN , *ADULT learning , *INFORMATION processing , *EXPERIMENTAL psychology - Abstract
Three experiments investigated the ability of 3-, 5-, and 8-year-old children as well as adults to learn sets of perceptual categories. Adults and children performed comparably on categories that could be learned by either a single-dimensional rule or by associative learning mechanisms. However, children showed poorer performance relative to adults in learning categories defined by a disjunctive rule and categories that were nonlinearly separable. Increasing the task demands for adults resulted in child-like performance on the disjunctive categories. Decreasing the task demands for children resulted in more adult-like performance on the disjunctive categories. The authors interpret these results within a multiple-systems approach to category learning and suggest that children have not fully developed the same explicit category learning system as adults. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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- View/download PDF
33. Multiple Systems in Decision Making.
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Sanfey, Alan G. and Chang, Luke J.
- Subjects
- *
NEUROECONOMICS , *HUMAN behavior , *COGNITIVE neuroscience , *DECISION making , *NEUROSCIENCES , *ECONOMICS , *COGNITIVE psychology , *CHOICE (Psychology) , *PSYCHOLOGY - Abstract
Neuroeconomics seeks to gain a greater understanding of decision making by combining theoretical and methodological principles from the fields of psychology, economics, and neuroscience. Initial studies using this multidisciplinary approach have found evidence suggesting that the brain may be employing multiple levels of processing when making decisions, and this notion is consistent with dual-processing theories that have received extensive theoretical consideration in the field of cognitive psychology, with these theories arguing for the dissociation between automatic and controlled components of processing. While behavioral studies provide compelling support for the distinction between automatic and controlled processing in judgment and decision making, less is known if these components have a corresponding neural substrate, with some researchers arguing that there is no evidence suggesting a distinct neural basis. This chapter will discuss the behavioral evidence supporting the dissociation between automatic and controlled processing in decision making and review recent literature suggesting potential neural systems that may underlie these processes. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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- View/download PDF
34. Binary star systems: projects for the near future.
- Author
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Wilson, R. E.
- Subjects
- *
BINARY stars , *KINEMATICS , *ASTRONOMICAL observations , *COMPUTER simulation , *EARLY stars , *RAYLEIGH scattering , *RAMAN spectroscopy - Abstract
Two computational models have now been extended to deal with the kinematics of triple systems via combined light-time and radial velocity variations of eclipsing binary mass centres. Applications to binaries known or suspected to be accompanied by third bodies can improve knowledge of multiple-system statistics. A neglected area is the measurement of polarization curves for Algol-type binaries, which pose instrumental and observational challenges. Algols should show polarization due to scattering in mass transfer streams and circumstellar discs, as well as Thomson scattering in the photospheres of their hot stars and Rayleigh scattering due to irradiation of their cooler stars. Polarization data need to be extended to sufficiently faint stars so as to observe these phenomena in a reasonable number of systems, which will require excellent polarimeters, large telescopes and good observing strategies. A third project is the measurement of distances, with standard errors, to many eclipsing binaries by direct distance estimation (DDE), for which the computer model will soon be made public. Accurate distances now can be found routinely by DDE. A fourth project is to establish photometric calibrations, by eclipsing binary observations, in standard physical units (say, erg s-1 cm-3 for a magnitude-zero star) in standard bands other than the modest number that have already been calibrated. Several of these projects will be made easier if journal regulations require that observation tables are always published and that times are given for all observations. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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- View/download PDF
35. Within-Category Discontinuity Interacts With Verbal Rule Complexity in Perceptual Category Learning.
- Author
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Maddox, W. Todd, Lauritzen, J. Scott, and Filoteo, J. Vincent
- Subjects
- *
LEARNING , *COMPREHENSION , *INTEGRATION (Theory of knowledge) , *INSTRUCTIONAL systems , *EDUCATION - Abstract
A test of the predicted interaction between within-category discontinuity and verbal rule complexity on information-integration and rule-based category learning was conducted. Within-category discontinuity adversely affected information-integration category learning but not rule-based category learning. Model- based analyses suggested that some information-integration participants improved performance by recruiting more "units" in the discontinuous condition. Verbal rule complexity adversely affected rule-based category learning but not information-integration category learning. Model-based analyses suggested that the rule based effect was on both decision criterion learning and variability in decision criterion placement. These results suggest that within-category discontinuity and decision rule complexity differentially impact information-integration and rule-based category learning and provide information regarding the detailed processing characteristics of these two proposed category learning systems. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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- View/download PDF
36. Multiple learning modes in the development of performance on a rule-based category-learning task
- Author
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Schmittmann, Verena D., Visser, Ingmar, and Raijmakers, Maartje E.J.
- Subjects
- *
NEUROPSYCHOLOGY research , *BEHAVIORAL assessment , *DISCRIMINATION learning , *STATISTICAL hypothesis testing , *INFLUENCE of age on ability , *WISCONSIN Card Sorting Test - Abstract
Abstract: Behavioral and neuropsychological data suggest that multiple systems are involved in category-learning. In this paper, the existence and the development of multiple modes of learning of a rule-based category structure was examined, and features of different learning processes were identified. Data were obtained in a cross-sectional study by Raijmakers et al. [Raijmakers, M. E. J., Dolan, C. V., & Molenaar, P. C. M. (2001). Finite mixture distribution models of simple discrimination learning. Memory and Cognition, 29, 659–677], in which subjects aged 4–20 years carried out a rule-based category-learning task. Learning models were employed to investigate the development of the learning processes in the sample. The results support the hypothesis of two distinct learning modes, rather than a single general mode of learning with a continuum of appearances. One mode represents sudden rational learning by means of hypothesis testing. In the second, slow learning mode, learning also occurs suddenly as opposed to incrementally. The probability of rational learning increases with age, and seems to be related to dimension preference in the younger age groups. However, the finding of distinct learning modes does not necessarily imply that distinct learning systems are involved. Implications for the interpretation and clinical use of tasks with a category-learning component, such as the Wisconsin Card Sorting Test (WCST [Heaton, R. K., Chelune, G. J., Talley, J. L., Kay, G. G., & Curtis, G. (Eds.). (1993). Wisconsin card sorting test manual: Revised and expanded. Odessa, FL: Psychological Assessment Resources]), are discussed. [Copyright &y& Elsevier]
- Published
- 2006
- Full Text
- View/download PDF
37. Discontinuous Categories Affect Information-Integration but Not Rule-Based Category Learning.
- Author
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Maddox, W. Todd, Filoteo, J. Vincent, Lauritzen, J. Scott, Connally, Emily, and Hejl, Kelli D.
- Subjects
- *
LEARNING , *COMPREHENSION , *SHORT-term memory , *MEMORY , *EXPERIMENTAL psychology , *PSYCHOLOGY - Abstract
Three experiments were conducted that provide a direct examination of within-category discontinuity manipulations on the implicit, procedural-based learning and the explicit, hypothesis-testing systems proposed in F. G. Ashby, L. A. Alfonso-Reese, A. U. Turken, and E. M. Waldron's (1998) competition between verbal and implicit systems model. Discontinuous categories adversely affected information-integration but not rule-based category learning. Increasing the magnitude of the discontinuity did not lead to a significant decline in performance. The distance to the bound provides a reasonable description of the generalization profile associated with the hypothesis-testing system, whereas the distance to the bound plus the distance to the trained response region provides a reasonable description of the generalization profile associated with the procedural-based learning system. These results suggest that within-category discontinuity differentially impacts information-integration but not rule-based category learning and provides information regarding the detailed processing characteristics of each category learning system. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
38. HUMAN CATEGORY LEARNING.
- Author
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Ashby, F. Gregory and Maddox, W. Todd
- Subjects
- *
LEARNING , *PERCEPTUAL learning , *PSYCHOLOGY of learning , *MEMORY , *COGNITION - Abstract
Much recent evidence suggests some dramatic differences in the way people learn perceptual categories, depending on exactly how the categories were constructed. Four different kinds of category-learning tasks are currently popular--rule-based tasks, information-integration tasks, prototype distortion tasks, and the weather prediction task. The cognitive, neuropsychological, and neuroimaging results obtained using these four tasks are qualitatively different. Success in rule-based (explicit reasoning) tasks depends on frontal-striatal circuits and requires working memory and executive attention. Success in information-integration tasks requires a form of procedural learning and is sensitive to the nature and timing of feedback. Prototype distortion tasks induce perceptual (visual cortical) learning. A variety of different strategies can lead to success in the weather prediction task. Collectively, results from these four tasks provide strong evidence that human category learning is mediated by multiple, qualitatively distinct systems. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
39. Comments on AMSAA-BISE reliability growth model (I).
- Author
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Mei Wen-hua, Guo Yue-e, and Yang Yi-xian
- Subjects
- *
NUMERICAL analysis , *DIFFERENTIAL equations , *SYSTEMS design , *SYSTEM analysis , *MATHEMATICAL analysis - Abstract
From 1986 to 1991, based on AMSAA model, Zhou Yuan-quan and Weng Zhao-xi presented AMSAA-BISE model to estimate reliability growth for multiple systems development, for the case that more than one system of the same type is put into reliability growth test, once a Type B failure mode is seen during test, corrective action will be taken to all systems. It is shown that there is something wrong with AMSAA-BISE model. According to AMSAA-BISE model, the maximum likelihood estimation of MTBF for multiple systems reliability growth test is much larger than that according to AMSAA model for a single system; The more systems is put into test, the larger the estimation of MTBF. An example is given, and an approximate method is presented. [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
40. The ubiquity of unresolved triple stars discovered by the GALAH and Gaia
- Author
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Čotar, Klemen and Zwitter, Tomaž
- Subjects
Multiplicity fraction ,Multiple systems ,Gaia DR2 - Abstract
Presentation slides to support pitch talk. The presentation delas with detection and analysis of unresolved mutiple stellar systems that can be detected only by knowing their exact distance that is computed from Gaia DR2 data. Multiple approaches are eployed to find their possible orbital variability and put constraints on orbital configuration. A detailed description of the analysis and pipeline that was used to produce the results can be found in the following paperThe GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission https://doi.org/10.1093/mnras/stz1397.
- Published
- 2019
- Full Text
- View/download PDF
41. Spiral arms and instability within the AFGL 4176 mm1 disc
- Author
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Hendrik Linz, Rolf Kuiper, N. D. Kee, Thomas P. Robitaille, A. Ahmadi, Luke T. Maud, Katharine G. Johnston, Melvin G. Hoare, Paul A. Boley, and Henrik Beuther
- Subjects
Continuum (design consultancy) ,FOS: Physical sciences ,CIRCUMSTELLAR MATTER ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astronomy & Astrophysics ,Rotation ,01 natural sciences ,Submillimeter Array ,Instability ,INTERFEROMETRIC [TECHNIQUES] ,STABILITY PARAMETERS ,LOCAL THERMODYNAMIC EQUILIBRIUM ,HIGH RESOLUTION ,FORMATION [STARS] ,ARCHIMEDEAN SPIRAL ,MULTIPLE SYSTEMS ,0103 physical sciences ,MASSIVE [STARS] ,ACCRETION ,010306 general physics ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,Spiral ,Solar and Stellar Astrophysics (astro-ph.SR) ,Physics ,HIGH-MASS STARS ,accretion, accretion disks ,Science & Technology ,Spiral galaxy ,Astronomy and Astrophysics ,Radius ,ATACAMA LARGE MILLIMETER/SUB-MILLIMETER ARRAYS ,Physik (inkl. Astronomie) ,VELOCITY ,Astrophysics - Astrophysics of Galaxies ,GIANT STARS ,CONTINUUM SOURCE ,Stars ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Physical Sciences ,ACCRETION DISKS ,Astrophysics::Earth and Planetary Astrophysics - Abstract
We present high-resolution (30 mas or 130 au at 4.2 kpc) Atacama Large Millimeter/submillimeter Array observations at 1.2 mm of the disc around the forming O-type star AFGL 4176 mm1. The disc (AFGL 4176 mm1-main) has a radius of ~1000 au and contains significant structure, most notably a spiral arm on its redshifted side. We fitted the observed spiral with logarithmic and Archimedean spiral models. We find that both models can describe its structure, but the Archimedean spiral with a varying pitch angle fits its morphology marginally better. As well as signatures of rotation across the disc, we observe gas arcs in CH$_3$CN that connect to other millimetre continuum sources in the field, supporting the picture of interactions within a small cluster around AFGL 4176 mm1-main. Using local thermodynamic equilibrium modelling of the CH$_3$CN K-ladder, we determine the temperature and velocity field across the disc, and thus produce a map of the Toomre stability parameter. Our results indicate that the outer disc is gravitationally unstable and has already fragmented or is likely to fragment in the future, possibly producing further companions. These observations provide evidence that disc fragmentation is one possible pathway towards explaining the high fraction of multiple systems around high-mass stars., Comment: Accepted by Astronomy & Astrophysics Letters, 8 pages (2 pages appendices), 11 figures
- Published
- 2019
- Full Text
- View/download PDF
42. A Rulebase Management System Using Conceptual Rule Modeling.
- Author
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Bouziane, M'Hamed and Hsu, Cheng
- Abstract
Conceptual modeling is a fundamental concept in information management. Although originated in the theory and practice of databases, its significance as a guiding principle reaches all areas of information integration efforts dealing with heterogeneous uses. In the field of knowledge-based systems, an emerging need is for expert system shells to be able to manage triggers that change frequently and to support heterogeneous applications which use the same rulebase simultaneously but in different ways. A conceptual schema is clearly in order for this new capability. In addition, it is central to integrating databases with knowledge bases as well as providing interoperability to multiple (heterogeneous and distributed) knowledge-based systems. This paper presents a rulebase management system (RBMS) featuring a conceptual schema. The model of the conceptual schema is developed using the Two-Stage Entity-Relationship approach, which is compatible with most common methods and requires only standard data and rules processing technology to implement. The architecture and execution model of RBMS are discussed in details. Its specific implementation design is applicable to managing rules both in the usual rule-based systems and in the systems where rules are embedded into objects or entities. The processing methods are verified with a prototype, which is also discussed in this paper. The RBMS design is being implemented for Samsung Electronics Corporation. [ABSTRACT FROM AUTHOR]
- Published
- 1997
- Full Text
- View/download PDF
43. A RULEBASE MODEL FOR DATA AND KNOWLEDGE INTEGRATION IN MULTIPLE SYSTEMS ENVIRONMENTS.
- Author
-
BOUZIANE, M'HAMED and HSU, CHENG
- Abstract
There are three aspects of integration that a computerized enterprise using multiple systems must address: (1) data integration (among, e.g., product design databases, shop floor control databases, and production planning databases), (2) knowledge integration (across various knowledge-based systems that share common enterprise facts, operating rules, or decision logic), and (3) data and knowledge integration (as as to, at least, calibrate databases with factbases and data models with knowledge models). A key issue in this integration problem is the global representation of knowledge (including data semantic constraints and application processing logic) in a form compatible with that of data resources. This paper develops a rulebase model to address this need. In particular, the model combines production rule and relation into a structure that allows (1) full factbase management, (2) inclusion of complete logic (both condition and action), and (3) efficient rulebase processing. It contributes directly to the problem of trigger management (or more generally, rule and event management) in both single-site and multiple-site data and knowledge systems. The model is implemented as a part of the Metadatabase system at Rensselaer. [ABSTRACT FROM AUTHOR]
- Published
- 1993
- Full Text
- View/download PDF
44. Pulmonary Langerhans cell histiocytosis and multiple system involvement: A case report.
- Author
-
Luo L and Li YX
- Abstract
Background: Pulmonary Langerhans cell histiocytosis (PLCH) is a relatively rare type of lung disease, common in middle-aged smoking men. It is characterized by proliferation and infiltration of Langerhans cells, and the formation of multiple parabronchial mesenchymal nodules in lung tissue, and may lead to organ dysfunction. There are no typical symptoms and signs, and it is easily misdiagnosed or missed, and therefore deserves clinical attention and further discussion., Case Summary: We describe the case of a nonsmoking 46-year-old man with PLCH diagnosed based on clinical manifestations of fever and dry cough, with a history of hypothyroidism and diabetes insipidus for 9 years. Computed tomography (CT)- and CT-guided puncture examinations revealed no abnormalities, and he ultimately underwent thoracoscopic biopsy to confirm the diagnosis. The pathological diagnosis was PLCH. Thyroid function was maintained by medication. Pituitary magnetic resonance imaging showed that the pituitary stalk had become thinner., Conclusion: LCH often involves multiple systems. Moreover, the pathogenesis is not clear, clinical manifestations lack specificity, and diagnosis requires special attention. Diagnosis of PLCH can significantly benefit from comprehensive multidisciplinary analysis., Competing Interests: Conflict-of-interest statement: There is no conflict-of-interest., (©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.)
- Published
- 2021
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- View/download PDF
45. The CARMENES search for exoplanets around M dwarfs Nine new double-line spectroscopic binary stars
- Author
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Cortés Contreras, Miriam, Montes Gutiérrez, David, otros, ..., Cortés Contreras, Miriam, Montes Gutiérrez, David, and otros, ...
- Abstract
© ESO 2018. Artículo firmado por 30 autores. We are grateful to C. Jordi for useful discussions on Gaia data. We also thank the anonymous referee for a thorough and very helpful review of the paper. CARMENES is an instrument for the Centro Astronómico Hispano-Alemán de Calar Alto (CAHA, Almería, Spain). CARMENES is funded by the German Max-Planck-Gesellschaft (MPG), the Spanish Consejo Superior de Investigaciones Científicas (CSIC), the European Union through FEDER/ERF FICTS-2011-02 funds, and the members of the CARMENES Consortium (Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía, Landessternwarte Königstuhl, Institut de Ciències de l’Espai, Insitut für Astrophysik Göttingen, Universidad Complutense de Madrid, Thüringer Landessternwarte Tautenburg, Instituto de Astrofísica de Canarias, Hamburger Sternwarte, Centro de Astrobiología and Centro Astronómico Hispano-Alemán), with additional contributions by the Spanish Ministry of Economy, the German Science Foundation through the Major Research Instrumentation Programme and DFG Research Unit FOR2544 “Blue Planets around Red Stars”, the Klaus Tschira Stiftung, the states of Baden-Württemberg and Niedersachsen, and by the Junta de Andalucía. We acknowledge support from the Spanish Ministry of Economy and Competitiveness (MINECO) and the Fondo Europeo de Desarrollo Regional (FEDER) through grants ESP2013-48391-C4-1-R, ESP2014-57495- C2-2-R and AYA2015-69350-C3-2-P, AYA2016-79425–C3–1/2/3–P, ESP2016- 80435-C2-1-R, as well as the support of the Generalitat de Catalunya/CERCA programme. We also acknowledge support from the Agència de Gestió d’Ajuts Universitaris i de Recerca of the Generalitat de Catalunya through grant 2018 FI_B_00188. This work makes use of data from the HARPS-N Project, a collab oration between the Astronomical Observatory of the Geneva University (lead), the CfA in Cambridge, the Universities of St. Andrews and Edinburgh, the Queens University of Belfast, and the TNG-INAF Observa, Context. The CARMENES spectrograph is surveying similar to 300 M dwarf stars in search for exoplanets. Among the target stars, spectroscopic binary systems have been discovered, which can be used to measure fundamental properties of stars. Aims. Using spectroscopic observations, we determine the orbital and physical properties of nine new double-line spectroscopic binary systems by analysing their radial velocity curves. Methods. We use two-dimensional cross-correlation techniques to derive the radial velocities of the targets, which are then employed to determine the orbital properties. Photometric data from the literature are also analysed to search for possible eclipses and to measure stellar variability, which can yield rotation periods. Results. Out of the 342 stars selected for the CARMENES survey, 9 have been found to be double-line spectroscopic binaries, with periods ranging from 1.13 to similar to 8000 days and orbits with eccentricities up to 0.54. We provide empirical orbital properties and minimum masses for the sample of spectroscopic binaries. Absolute masses are also estimated from mass-luminosity calibrations, ranging between similar to 0.1 and similar to 0.6 M-circle dot. Conclusions. These new binary systems increase the number of double-line M dwarf binary systems with known orbital parameters by 15%, and they have lower mass ratios on average., Ministerio de Economía y Competitividad (MINECO)/FEDER, German Max-Planck-Gesellschaft (MPG), Consejo Superior de Investigaciones Científicas (CSIC), Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía, Landessternwarte Königstuhl, Institut de Ciències de l’Espai, Insitut für Astrophysik Göttingen, Universidad Complutense de Madrid, Thüringer Landessternwarte Tautenburg, Instituto de Astrofísica de Canarias, Hamburger Sternwarte, Centro de Astrobiología, Centro Astronómico Hispano-Alemán, Spanish Ministry of Economy, German Science Foundation through the Major Research Instrumentation Programme and DFG Research Unit FOR2544 “Blue Planets around Red Stars”, Klaus Tschira Stiftung, State of Baden-Württemberg, State of Niedersachsen, Junta de Andalucía, Fondo Europeo de Desarrollo Regional (FEDER), Generalitat de Catalunya/CERCA programme, Agència de Gestió d’Ajuts Universitaris i de Recerca of the Generalitat de Catalunya, DPAC, Depto. de Física de la Tierra y Astrofísica, Fac. de Ciencias Físicas, TRUE, pub
- Published
- 2018
46. Highly efficient and fast removal of colored pollutants from single and binary systems, using magnetic mesoporous silica.
- Author
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Nicola, Roxana, Muntean, Simona-Gabriela, Nistor, Maria-Andreea, Putz, Ana-Maria, Almásy, László, and Săcărescu, Liviu
- Subjects
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MESOPOROUS silica , *MESOPOROUS materials , *POLLUTANTS , *ADSORPTION capacity , *MATERIALS testing , *DYES & dyeing , *METHYLENE blue - Abstract
Magnetic mesoporous silica material was tested as adsorbent for removal of two usual colored compounds present in industrial wastewater. The magnetic mesoporous silica was synthesized by modified sol-gel method and characterized from the morpho-textural, structural and magnetic point of view. The specific surface area and the total pore volume indicate a good adsorption capacity of the material, and the obtained saturation magnetization strength value denotes a good magnetic separation from solution. The adsorption capacity of magnetic mesoporous silica increases with the increase of the initial dye concentration, and the removal efficiency of the dyes was dependent on the pH of the solution and decreased with increasing temperature. The pseudo-second-order kinetic model described best the adsorption mechanism, and the maximum adsorption capacities were determined from the Sips isotherm model, being 88.29 mg/g for Congo Red and 208.31 mg/g for Methylene Blue. A complete thermodynamic evaluation was performed, by determining the free energy, enthalpy and entropy, and the result showed a spontaneous and exothermic adsorption process. The recovery and reutilization of the adsorbent were estimated in five cycles of adsorption-desorption, and the results indicated a good stability and reusability of magnetic mesoporous silica. The new magnetic mesoporous silica can be easily separated from solution, via an external magnetic field, and may be effectively applied as adsorbent for elimination of dyes from colored polluted waters. Image 1 • New maghemite silica mesoporous material was synthesized and applied as adsorbent. • The material showed high removal efficiency dyes from single and binary systems. • Fe 2 O 3 @mSiO 2 provides a short adsorption equilibrium time and easy magnetic separation. • The material is easy regenerate and recycled with good efficiency in multiple cycles. • The kinetic and equilibrium parameters were obtained from pseudo-second order model and Sips model. [ABSTRACT FROM AUTHOR]
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- 2020
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47. Knowledge-based interoperability for mathematical software systems
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Dennis Müller, Tom Wiesing, Victor Vasilyev, Markus Pfeiffer, Nicolas M. Thiéry, Michael Kohlhase, Luca De Feo, Florian Rabe, Blömer, Johannes, Kotsireas, Ilias, Kutsia, Temur, Simos, Dimitris E., European Commission, University of St Andrews. School of Computer Science, University of St Andrews. Centre for Interdisciplinary Research in Computational Algebra, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Laboratoire de Mathématiques de Versailles (LMV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), University of St Andrews [Scotland], Jacobs University [Bremen], Université Paris-Sud - Paris 11 (UP11), Deutsche Forschungsgemeinschaft RA-18723-1 OAF676541, and Kotsireas I.S.Blomer J.Simos D.E.Kutsia T.
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Computation theory ,Theoretical mathematics ,Computational group theory ,Interoperability ,T-NDAS ,Maintainability ,010103 numerical & computational mathematics ,01 natural sciences ,Virtual research environment ,QA76 ,Knowledge-based systems ,QA76 Computer software ,Multiple systems ,Mathematical software ,Computer software ,Software system ,[MATH]Mathematics [math] ,0101 mathematics ,Software systems ,business.industry ,010101 applied mathematics ,Scalability ,Theory of computation ,Knowledge based systems ,Group theory ,Central systems ,Software engineering ,business ,Knowledge based - Abstract
Funding: OpenDreamKit Horizon 2020 European Research Infrastructures project (#676541) and DFG project RA-18723-1 OAF. There is a large ecosystem of mathematical software systems. Individually, these are optimized for particular domains and functionalities, and together they cover many needs of practical and theoretical mathematics. However, each system specializes on one area, and it remains very difficult to solve problems that need to involve multiple systems. Some integrations exist, but the are ad-hoc and have scalability and maintainability issues. In particular, there is not yet an interoperability layer that combines the various systems into a virtual research environment (VRE) for mathematics. The OpenDreamKit project aims at building a toolkit for such VREs. It suggests using a central system-agnostic formalization of mathematics (Math-in-the-Middle, MitM) as the needed interoperability layer. In this paper, we conduct the first major case study that instantiates the MitM paradigm for a concrete domain as well as a concrete set of systems. Specifically, we integrate GAP, Sage, and Singular to perform computation in group and ring theory. Our work involves massive practical efforts, including a novel formalization of computational group theory, improvements to the involved software systems, and a novel mediating system that sits at the center of a star-shaped integration layout between mathematical software systems. Postprint
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- 2017
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48. An astrometric study of the triple star ADS 48
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Kiyaeva, O. V., Kiselev, A. A., Polyakov, E. V., and Rafal’skii, V. B.
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- 2001
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49. The Planetary System to KIC 11442793: A Compact Analogue to the Solar System
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Davide Gandolfi, Ph. Eigmueller, Heike Rauer, Sz. Csizmadia, Rudolf Dvorak, Holger Lehmann, Anders Erikson, A. P. Hatzes, J. Cabrera, and C. Dreyer
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exoplanets ,transits ,Solar System ,planets and satellites: detection ,planets and satellites: dynamical evolution and stability ,KOI 351 ,Gas giant ,FOS: Physical sciences ,Perturbation (astronomy) ,Kepler-90) ,planetary systems ,stars: individual (KIC 11442793, KOI 351, Kepler-90) ,techniques: photometric ,techniques: spectroscopic ,Astronomy and Astrophysics ,Space and Planetary Science ,dynamical interactions ,multiple planet systems ,Planet ,Kepler ,Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,Orbital elements ,planetology ,stars: individual (KIC 11442793 ,Astronomy ,Planetary system ,Orbital period ,transiting extrasolar planets ,Mean motion ,Astrophysics::Earth and Planetary Astrophysics ,multiple systems ,Kepler ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We announce the discovery of a planetary system with 7 transiting planets around a Kepler target, a current record for transiting systems. Planets b, c, e and f are reported for the first time in this work. Planets d, g and h were previously reported in the literature (Batalha et al. 2013), although here we revise their orbital parameters and validate their planetary nature. Planets h and g are gas giants and show strong dynamical interactions. The orbit of planet g is perturbed in such way that its orbital period changes by 25.7h between two consecutive transits during the length of the observations, which is the largest such perturbation found so far. The rest of the planets also show mutual interactions: planets d, e and f are super-Earths close to a mean motion resonance chain (2:3:4), and planets b and c, with sizes below 2 Earth radii, are within 0.5% of the 4:5 mean motion resonance. This complex system presents some similarities to our Solar System, with small planets in inner orbits and gas giants in outer orbits. It is, however, more compact. The outer planet has an orbital distance around 1 AU, and the relative position of the gas giants is opposite to that of Jupiter and Saturn, which is closer to the expected result of planet formation theories. The dynamical interactions between planets are also much richer., submitted to ApJ in its original form on July, 9th 2013 and accepted in its present form on November, 8th 2013
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- 2014
50. Executive Functions and the Interaction Between Category Learning Systems
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Miles, Sarah J
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Executive functions ,Categorization ,Multiple systems ,Cognitive Psychology - Abstract
Research on the cognitive processes underlying category learning provides evidence for two separate learning systems. A verbal system learns rule-defined (RD) categories and a nonverbal system learns non-rule-defined (NRD) categories. The objective of my dissertation is to explore the interaction between these systems. The verbal system is dominant in that adults tend to use it during initial learning but may switch to the nonverbal system when the verbal system is unsuccessful. The nonverbal system has traditionally been thought to operate independently of executive functions, but recent studies suggest that executive functions may be used to facilitate the transition away from the verbal system. Study 1 investigated whether executive functions play similar roles across systems and which, if any, components of executive functions are most important for the verbal and nonverbal systems. The components of executive functions were associated with both types of category learning but played different roles within each system. Study 2 compared the effects of a temporary and continuous executive function disruption for each system. When executive functions were continuously unavailable, the transition to the nonverbal system was hindered, providing evidence that executive functions are needed to transition between systems. For the verbal system, temporary and continuous interference had similar effects, illustrating that any executive function disruption is detrimental to the verbal system. Studies 3 and 4 experimentally manipulated the interaction between systems. Manipulating the order in which categories were learned affected the initial strengths of the systems. Strengthening the verbal system reduced optimal strategy use on subsequent nonverbal categorization, but the opposite was not true. Increasing stimulus knowledge facilitated rule searching and increased optimal strategy use on nonverbal categorization but not on verbal categorization. Conclusions. The current studies illustrate that the transition between systems is disrupted when executive functions are never fully available and when the verbal system is strengthened, but is facilitated when hypothesis testing is expedited. This research provides insight into the interaction between category learning systems and illustrates that the interaction is mediated by executive functions. Furthermore, executive functions play an important but different role in each system.
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- 2013
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