scholarly journals Control-Scheduling Codesign Exploiting Trade-Off between Task Periods and Deadlines

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Hyun-Jun Cha ◽  
Woo-Hyuk Jeong ◽  
Jong-Chan Kim
Keyword(s):  
Low Complexity ◽  
Sampling Frequency ◽  
Control Performance ◽  
Large Size ◽  
Priority Systems ◽  
Suboptimal Solution ◽  
Size Task ◽  
Frequent Sampling ◽  
Task Sets ◽  
Positive Effect

A control task’s performance heavily depends on its sampling frequency and sensing-to-actuation delay. More frequent sampling, that is, shorter period, improves the control performance. Similarly, shorter delay also has a positive effect. Moreover, schedulability is also a function of periods and deadlines. By taking into account the control performance and schedulability at the same time, this paper defines a period and deadline selection problem for fixed-priority systems. Our problem is to find the optimal periods and deadlines for given tasks that maximize the overall system performance. As our solution, this paper presents a novel heuristic algorithm that finds a high-quality suboptimal solution with very low complexity, which makes the algorithm practically applicable to large size task sets.

scholarly journals Liquid–Liquid Phase Separation Enhances TDP-43 LCD Aggregation but Delays Seeded Aggregation

Biomolecules ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 548
Author(s):  
Donya Pakravan ◽  
Emiel Michiels ◽  
Anna Bratek-Skicki ◽  
Mathias De Decker ◽  
Joris Van Lindt ◽  
...  
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Hydrophobic Interactions ◽  
Low Complexity ◽  
Liquid Phase Separation ◽  
End Stage ◽  
Positive Effect ◽  
Self Aggregation ◽  
Lateral Sclerosis ◽  
Liquid Liquid Phase Separation

Aggregates of TAR DNA-binding protein (TDP-43) are a hallmark of several neurodegenerative disorders, including amyotrophic lateral sclerosis (ALS). Although TDP-43 aggregates are an undisputed pathological species at the end stage of these diseases, the molecular changes underlying the initiation of aggregation are not fully understood. The aim of this study was to investigate how phase separation affects self-aggregation and aggregation seeded by pre-formed aggregates of either the low-complexity domain (LCD) or its short aggregation-promoting regions (APRs). By systematically varying the physicochemical conditions, we observed that liquid–liquid phase separation (LLPS) promotes spontaneous aggregation. However, we noticed less efficient seeded aggregation in phase separating conditions. By analyzing a broad range of conditions using the Hofmeister series of buffers, we confirmed that stabilizing hydrophobic interactions prevail over destabilizing electrostatic forces. RNA affected the cooperativity between LLPS and aggregation in a “reentrant” fashion, having the strongest positive effect at intermediate concentrations. Altogether, we conclude that conditions which favor LLPS enhance the subsequent aggregation of the TDP-43 LCD with complex dependence, but also negatively affect seeding kinetics.

scholarly journals Lagged Effect of Macroeconomic Variables on Stock Returns: A Case of Firm Size

2021 ◽  
Vol 19 (1) ◽  
Keyword(s):  
Stock Returns ◽  
Firm Size ◽  
Small Firms ◽  
Size Group ◽  
Negative Effects ◽  
Macroeconomic Factors ◽  
Large Size ◽  
Negative Effect ◽  
Positive Effect ◽  
Lagged Effect

The evidence of lagged effect regarding firm size between macroeconomic factors and stock returns is found with GARCH model for the UAE firms. More precisely, exchange rate showed a significant effect on stock returns irrespective of size group and lag level. However, a positive effect is observed at lag four and a negative effect is observed on lag five and two for small and large size firms respectively. For majority of the firms in small size, the risk-free rate showed a negative lagged effect on stock returns; however, for the majority of the firms in large size, it showed a positive lagged effect on stock returns. Inflation also showed a significant effect on stock returns on each lag level except for large firms where at lag five it is insignificant. Moreover, as the lags increase from 1- 4 and size from small to large, the negative effect of inflation converts to positive effect on stock returns. The lag effect of real activity showed both positive and negative effects on relatively larger stock returns of small firms than big firms. Money supply showed positive significant effect on stock returns of all firms irrespective of the size group; however, this relationship is even more prominent at lag five. Finally, the oil prices showed a positive effect on stock returns (large size) which further maximizes at lag two; whereas, a negative maximization takes place at lag three. Hence, investors can make informed and effective decisions and UAE policymakers developed effective measures to control and promote macroeconomic growth and stability.

scholarly journals Low-Complexity Decentralized Active Damping of One-Dimensional Structures

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Petr Hušek ◽  
Filip Svoboda ◽  
Martin Hromčík ◽  
Zbyněk Šika
Keyword(s):  
Damping Ratio ◽  
Stability Margin ◽  
Low Complexity ◽  
Active Damping ◽  
Fine Tuning ◽  
Control Performance ◽  
Control Laws ◽  
H Infinity ◽  
One Dimensional ◽  
Mu Synthesis

In the paper, we propose distributed feedback control laws for active damping of one-dimensional mechanical structures equipped with dense arrays of force actuators and position and velocity sensors. We consider proportional position and velocity feedback from the neighboring nodes with symmetric gains. Achievable control performance with respect to stability margin and damping ratio is discussed. Compared to full-featured complex controllers obtained by modern design methods like LQG, H-infinity, or mu-synthesis, these simplistic controllers are more suitable for experimental fine tuning and are less case-dependent, and they shall be easier to implement on the target future smart-material platforms.

Effects of Water Absorption and Size of Superabsorbent Polymers on Internal Curing of Cement Paste

2013 ◽  
Vol 743-744 ◽  
pp. 193-197 ◽  
Author(s):  
Wen Bin Wang ◽  
Ji Ping Liu ◽  
Qian Tian ◽  
Yu Jiang Wang ◽  
Lei Li
Keyword(s):  
Water Absorption ◽  
Cement Paste ◽  
Autogenous Shrinkage ◽  
High Water ◽  
Internal Curing ◽  
Superabsorbent Polymers ◽  
Large Size ◽  
Negative Effect ◽  
The Relationship ◽  
Positive Effect

In recent years, superabsorbent polymers (SAPs) are considered as promising material for internal curing of cement-based materials, however, the relationship between SAPs structure and its performance are still unclear. In this paper, SAPs with different water absorption and size were selected to discuss their effect on autogenous deformation of cement paste and strength of mortars. Results indicated that SAPs with large-size and high-water absorption had positive effect on autogenous shrinkage reduction. The influence of SAPs on mortar mechanical properties revealed that SPAs seemed to have no negative effect on the strength of cement past. The increase of the strength might be from the decreased water/cement (w/c) ratio due to the water absorption by SAPs.

scholarly journals What flowers do we like? The influence of shape and color on the rating of flower beauty

2016 ◽  
Author(s):  
Martin Hůla ◽  
Jaroslav Flegr
Keyword(s):  
Online Survey ◽  
Low Complexity ◽  
Blue Color ◽  
The Czech Republic ◽  
Plant Interaction ◽  
The People ◽  
Flower Traits ◽  
Evolutionary Aesthetics ◽  
Positive Effect ◽  
Interaction Research

There is no doubt that people find flowers beautiful. Surprisingly, we know very little about the actual properties which make flowers so appealing to humans. Although the evolutionary aesthetics provides some theories concerning generally preferred flower traits, empirical evidence is largely missing. In this study, we used an online survey in which residents of the Czech Republic (n = 2006) rated the perceived beauty of 52 flower stimuli of diverse shapes and colors. Colored flowers were preferred over their uncolored versions. When controlling for flower shape, we found an unequal preference for different flower colors, blue being the most and yellow the least preferred. In the overall assessment of beauty, shape was more important than color. Prototypical flowers, i.e., radially symmetrical flowers with low complexity, were rated as the most beautiful. We also found a positive effect of sharp flower contours and blue color on the overall rating of flower beauty. The results may serve as a basis for further studies in some areas of the people-plant interaction research.

The More Complex the More Inefficient: Evidence from Online Health Knowledge Sharing Platform Incentive Mechanism (Preprint)

2021 ◽  
Author(s):  
Yuanyuan Dang ◽  
Shanshan Guo ◽  
Haochen Song ◽  
Yi Li
Keyword(s):  
Knowledge Sharing ◽  
Health Knowledge ◽  
Low Complexity ◽  
Fixed Effect ◽  
High Complexity ◽  
Professional Titles ◽  
Negative Effect ◽  
Professional Health ◽  
Positive Effect

BACKGROUND Online health knowledge-sharing platforms (OHKSPs) play an increasingly important role in enriching residents’ health knowledge, thus improving their health behaviors. The participation of physicians determines whether the platforms can provide high-quality health knowledge to the public. However, little research has focused on motivating physicians to share more professional health knowledge on the platforms. Understanding physicians’ behavioral intention for professional health knowledge sharing (PHKS) is essential to support the development of OHKSPs and improve public health. OBJECTIVE We examine the relationship between incentives and PHKS in OHKSPs. Specifically, we explore the effects of incentives with different complexities in an OHKSP on the quantity and quality of PHKS. We explore how such effects differ across varying levels of professional titles. METHODS We conducted four field experiments with different incentive strategies in one of China's largest OHKSPs. Monthly panel data of 10,584 physicians were collected from January 2018 to December 2019. An empirical study with a fixed-effect analysis was conducted to test our hypotheses. The time fixed effect and the individual fixed effect were considered to identify incentives' effects on physicians’ PHKS. Additionally, a cross-sectional analysis was performed for a robustness check. RESULTS The results show that the incentive has a significant positive effect on the quantity of physicians’ PHKS (β=0.50012, 0.35167, 0.28337, 0.22899; p<0.01). However, the incentive has a significant negative effect on the quality of physicians’ PHKS (β=-0.12911, -0.12039, -0.10948, -0.07933; p<0.01). We found that the positive effect of incentives with high complexity on the quantity of physicians’ PHKS is significantly smaller than incentives with low complexity (0.22899<0.50012, p<0.01). The absolute value of the negative effect of incentives with high complexity on the quality of physicians’ PHKS is also significantly smaller than incentives with low complexity (-0.12911<-0.07933, p<0.01). Moreover, we found that high professional title positively impacts the effect of incentives with low complexity on both the quantity and the quality of physicians’ PHKS (coefficients are in the same valence). CONCLUSIONS Incentives have a bilateral effect on PHKS, i.e., a positive effect on the quantity of physicians’ contribution and a negative effect on the quality of physicians’ PHKS. Such bilateral switches of PHKS require a balanced state in conjunction with practical implications. Furthermore, the more complex the incentives are, the more inefficient the effects on physicians’ PHKS are. This research also identifies a moderate effect of professional titles on incentives and physicians’ PHKS.

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