5,510 research outputs found
Balian-Low Theorems in Several Variables
Recently, Nitzan and Olsen showed that Balian-Low theorems (BLTs) hold for
discrete Gabor systems defined on . Here we extend these results
to a multivariable setting. Additionally, we show a variety of applications of
the Quantitative BLT, proving in particular nonsymmetric BLTs in both the
discrete and continuous setting for functions with more than one argument.
Finally, in direct analogy of the continuous setting, we show the Quantitative
Finite BLT implies the Finite BLT.Comment: To appear in Approximation Theory 16 conference proceedings volum
Simulation and analysis of spatio-temporal maps of gastrointestinal motility
<p>Abstract</p> <p>Background</p> <p>Spatio-temporal (ST) maps provide a method for visualizing a temporally evolving and spatially varying field, which can also be used in the analysis of gastrointestinal motility. However, it is not always clear what the underlying contractions are that are represented in ST maps and whether some types of contractions are poorly represented or possibly not at all.</p> <p>Methods</p> <p>To analyze the translation from stationary or propagating rhythmic contractions of the intestine to ST maps, a simulation program was used to represent different patterns of intestinal contraction and to construct their corresponding ST maps. A number of different types of contractions were simulated and their ST maps analyzed.</p> <p>Results</p> <p>Circular strong contractions were well represented in ST maps as well as their frequency and velocity. Longitudinal contractions were not detected at all. Combinations of circular and longitudinal contractions were, to a limited extent detectable at a point in space and time. The method also enabled the construction of specific ST-patterns to mimic real-life ST maps and the analysis of the corresponding contraction patterns.</p> <p>Conclusion</p> <p>Spatio-temporal simulations provide a method to understand, teach and analyze ST maps. This approach could be useful to determine characteristics of contractions under a variety of circumstances.</p
Applicability of Zipper Merge Versus Early Merge in Kentucky Work Zones
In an effort to improve work zone safety and streamline traffic flows, a number of state transportation agencies (STAs) have experimented with the zipper merge. The zipper merge differs from a conventional, or early, merge in that vehicles do not merge into the lane that remains open immediately after being notified of a lane closure. Rather, vehicles continue to occupy all lanes until they reach the taper, at which point β and directed by signage β vehicles take turns merging into the open lane, creating a zipper pattern. At the request of the Kentucky Transportation Cabinet (KYTC), Kentucky Transportation Center (KTC) researchers reviewed the performance of the zipper merge as documented in case studies from other states and analyzed two instances of the zipper merge being implemented in Kentucky. Previous studies found zipper merges are optimal on roadways with heavy traffic, whereas the conventional merge is preferable for uncongested and low-volume roadways. The case studies used a blend of quantitative and qualitative, observational data; researchers investigated the performance of zipper merges installed on Interstate 275βs Carroll Copper Bridge and KY 9βs Taylor Southgate Bridge. For the I-275 bridge, KTC researchers were able to compare the early merge configuration to the zipper merge. Here, the zipper merge brought about minor, although statistically insignificant, improvements in traffic flow and roadway safety. Analysis of the zipper merge on the Taylor Southgate Bridge relied more heavily on qualitative data, as the zipper merge was installed from the outset of the study and no comparison to an early merge could be made. The zipper merge appeared to improve traffic flow, reduce backups, and minimize the area impacted by construction. While neither case study offers definitive evidence that the zipper merge is significantly more effective than the early merge, they offer limited support for its use. On this basis, researchers suggest its continued implementation on other KYTC projects. Implementing the zipper merge elsewhere in Kentucky will enable further data collection and potentially identify locations and situations for which the zipper merge is the most appropriate merging method
Dynamic Scheduling Techniques in Cloud Manufacturing β An Exploration of Deep Reinforcement Learning as a Critical Opportunity for Future Research
Objective: Determine the state-of-the-art in dynamic scheduling techniques for cloud manufacturing.Significance: This paper firmly establishes the underexplored technique of Deep Reinforcement Learning as the state-of-the-art for dynamic scheduling in cloud manufacturing, exposes a significant gap in the literature, and sets out critical future research objectives.Abstract:For many years, metaheuristic algorithms have represented the state of the art in manufacturing scheduling techniques, proving to be exceptionally reliable for optimising schedules. However, metaheuristics suffer from inherent weaknesses that inhibit their ability to be applied to dynamic cloud manufacturing (CMfg) scheduling problems in practice. Thanks to the very recent and rapidly accelerating development in deep reinforcement learning (DRL), a small sample of studies have described how those approaches have thoroughly outperformed metaheuristic algorithms in dynamic manufacturing scheduling problems, establishing a new state of the art. However, a significant lag in maturity exists between the algorithms used in CMfg and state-of-the-art DRL. This paper systematically reviews the CMfg scheduling literature published between 2010 and 2020, summarises the development of deep reinforcement learning in this context and offers valuable directions for future research.</jats:p
Automatic C-Plane Detection in Pelvic Floor Transperineal Volumetric Ultrasound
Β© 2020, Springer Nature Switzerland AG. Transperineal volumetric ultrasound (US) imaging has become routine practice for diagnosing pelvic floor disease (PFD). Hereto, clinical guidelines stipulate to make measurements in an anatomically defined 2D plane within a 3D volume, the so-called C-plane. This task is currently performed manually in clinical practice, which is labour-intensive and requires expert knowledge of pelvic floor anatomy, as no computer-aided C-plane method exists. To automate this process, we propose a novel, guideline-driven approach for automatic detection of the C-plane. The method uses a convolutional neural network (CNN) to identify extreme coordinates of the symphysis pubis and levator ani muscle (which define the C-plane) directly via landmark regression. The C-plane is identified in a postprocessing step. When evaluated on 100 US volumes, our best performing method (multi-task regression with UNet) achieved a mean error of 6.05 mm and 4.81 and took 20 s. Two experts blindly evaluated the quality of the automatically detected planes and manually defined the (gold standard) C-plane in terms of their clinical diagnostic quality. We show that the proposed method performs comparably to the manual definition. The automatic method reduces the average time to detect the C-plane by 100 s and reduces the need for high-level expertise in PFD US assessment
Π₯ΠΎΠ»ΠΎΡΡΠΎΠΏΠ½ΠΎΠ΅ Π΄ΡΡ Π°Π½ΠΈΠ΅ ΠΊΠ°ΠΊ ΠΌΠ΅ΡΠΎΠ΄ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»Π° Π»ΠΈΡΠ½ΠΎΡΡΠΈ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠ°
ΠΠ° ΡΠ΅Π³ΠΎΠ΄Π½ΡΡΠ½ΠΈΠΉ Π΄Π΅Π½Ρ Π² ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΡΡ
ΡΡΡΠ΅ΡΡΠ²ΡΠ΅Ρ ΠΌΠ½ΠΎΠΆΠ΅ΡΡΠ²ΠΎ ΠΏΡΠΎΠ±Π»Π΅ΠΌ, ΠΈΠ·-Π·Π° ΠΊΠΎΡΠΎΡΡΡ
Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡ ΡΠ»ΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΊΠ°ΠΊ Π² ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠ΅ΠΌ, ΡΠ°ΠΊ ΠΈ Π² ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠΎΠ². ΠΠ»Ρ Π»ΡΠ±ΠΎΠ³ΠΎ ΡΠΏΡΠ°Π²Π»ΡΡΡΠ΅Π³ΠΎ ΠΊΠΎΠΌΠΏΠ°Π½ΠΈΠ΅ΠΉ Π²Π°ΠΆΠ½ΠΎ, ΡΡΠΎΠ±Ρ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊ Π±ΡΠ» ΡΠ²Π΅ΡΠ΅Π½Π½ΡΠΌ, ΡΠΌΠ΅ΡΡΠΈΠΌ Π½Π΅ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΠΎ ΠΌΡΡΠ»ΠΈΡΡ, ΠΈΠ½ΠΈΡΠΈΠ°ΡΠΈΠ²Π½ΡΠΌ, ΡΠ΅Π»Π΅ΡΡΡΡΠ΅ΠΌΠ»Π΅Π½Π½ΡΠΌ, Π½ΠΎ Π² Π±ΠΎΠ»ΡΡΠΈΠ½ΡΡΠ²Π΅ ΡΠ»ΡΡΠ°Π΅Π² Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ ΡΠ°ΠΊΠΈΠ΅ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠΈ ΠΎΡΡΡΡΡΡΠ²ΡΡΡ ΠΈΠ»ΠΈ ΠΈΡ
ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΎΠ³ΡΠ°Π½ΠΈΡΠ΅Π½Π½ΠΎ. Π Π»ΡΠ±ΠΎΠΌ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠ΅ ΠΊΡΠΎΠ΅ΡΡΡ ΡΠ²ΠΎΡΡΠ΅ΡΠΊΠ°Ρ Π»ΠΈΡΠ½ΠΎΡΡΡ, ΠΊΠΎΡΠΎΡΠ°Ρ Π½Π΅ Π²ΡΠ΅Π³Π΄Π° ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ ΡΠ΅Π°Π»ΠΈΠ·ΠΎΠ²Π°Π½Π° Π½Π° ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΈΠ»ΠΈ ΠΆΠ΅ ΠΏΡΠΎΡΡΠΎ ΠΏΠΎΠ΄Π°Π²Π»Π΅Π½Π°. ΠΠ»Ρ ΡΠΎΠ³ΠΎ ΡΡΠΎΠ±Ρ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠ΅ ΠΌΠΎΠ³Π»ΠΎ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°ΡΡ, Π²Π°ΠΆΠ½ΠΎ, ΡΡΠΎΠ±Ρ ΠΊΠ°ΠΆΠ΄ΡΠΉ ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊ ΠΌΠΎΠ³ ΡΠ°Π·ΠΎΠ±ΡΠ°ΡΡΡΡ Π² ΡΠ²ΠΎΠΈΡ
ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ°Ρ
ΠΈ ΠΎΠ±ΡΠ΅ΡΡΠΈ Π²Π½ΡΡΡΠ΅Π½Π½ΡΡ Π³Π°ΡΠΌΠΎΠ½ΠΈΡ, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ Π΅ΠΌΡ Π½Π°ΡΡΡΠΎΠΈΡΡΡΡ Π½Π° ΡΠ°Π±ΠΎΡΡ ΠΈ Π²ΡΠΏΠΎΠ»Π½ΡΡΡ Π΅Π΅ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ. ΠΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° Ρ
ΠΎΠ»ΠΎΡΡΠΎΠΏΠ½ΠΎΠ³ΠΎ Π΄ΡΡ
Π°Π½ΠΈΡ ΠΌΠΎΠΆΠ΅Ρ ΠΏΠΎΠΌΠΎΡΡ Π»ΠΈΡΠ½ΠΎΡΡΠΈ ΡΠ΅Π°Π»ΠΈΠ·ΠΎΠ²Π°ΡΡ ΡΠ²ΠΎΠΉ ΡΠΊΡΡΡΡΠΉ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π». Π¦Π΅Π»Ρ ΡΠ°Π±ΠΎΡΡ: ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ Ρ
ΠΎΠ»ΠΎΡΡΠΎΠΏΠ½ΠΎΠ³ΠΎ Π΄ΡΡ
Π°Π½ΠΈΡ Π² ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΈ ΠΈ Π²ΡΡΠ²ΠΈΡΡ, ΠΊΠ°ΠΊΠΎΠ΅ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΠΎΠ½Π° ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅Ρ ΠΊΠ°ΠΊ Π½Π° ΡΠΎΡΡΡΠ΄Π½ΠΈΠΊΠΎΠ², ΡΠ°ΠΊ ΠΈ Π½Π° ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠ΅ Π² ΡΠ΅Π»ΠΎΠΌ. ΠΠ΅ΡΠΎΠ΄Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ: Π°Π½Π°Π»ΠΈΠ· Π»ΠΈΡΠ΅ΡΠ°- ΡΡΡΡ ΠΏΠΎ Π΄Π°Π½Π½ΠΎΠΉ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ°ΡΠΈΠΊΠ΅, Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ: Π²ΡΠ²ΠΎΠ΄Ρ, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ Π² Π΄Π°Π½Π½ΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ, ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π΄Π΅ΠΉΡΡΠ²Π΅Π½Π½ΠΎΡΡΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΈ Ρ
ΠΎΠ»ΠΎΡΡΠΎΠΏΠ½ΠΎΠ³ΠΎ Π΄ΡΡ
Π°Π½ΠΈΡ ΠΈ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ Π΅Π΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ Π² ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΈ. Today there are many problems in organizations which lead to difficulties in the management of an enterpriseand in the effective work of the staff. For any company manager it is important that the employee wasconfident, able to think outside the box, initiative, committed, but in most cases such employees are absent ortheir number is limited. There is creative personality in any employee which canβt always be revealed or issimply suppressed. In order for a company to operate effectively, it is important that every employee couldunderstand their problems and find inner harmony, which will allow them to tune into work and perform itefficiently. The technique of holotropic breathwork can help the person to realize their hidden potential. Objective:to determine the significance of the technique of holotropic breathwork in the organization and itsimpact on the employees and the enterprise as a whole. Methods: review of the literature on this subject,data analysis. Results. The findings of this study help to identify the effective methods of holotropic breathworkand the importance of its application in the organization
Towards a novel framework of barriers and drivers for digital transformation in industrial supply chains
Β© 2019 PICMET. Businesses across all sectors are facing the complexity of an increasingly digital economy. Digital transformation offers vast opportunities to businesses and entire supply chains. While many investments are targeted at the organization level, the supply chain perspective can lead to even greater impacts on business performance. However, as supply chains involve interconnections between multiple actors, comprehensive digitalization initiatives at this level are very complex. Several strategic factors affect decision-making around digital investments. For this reason, a framework that categorizes all these factors is needed in order to help managers build digitalization strategies for their supply chains. In this paper, based on a review of existing literature, we give indications for a framework encompassing barriers to and drivers for digital transformation in the context of industrial supply chains. Our framework preliminarily allocates these factors by using two dimensions. The first one classifies them using several categories: financial, knowledge and skills, regulatory, technological, market, organizational, and cultural. The second dimension classifies determinants at the level on which actions can be made, i.e. market, supply chain, or organization. The framework can support organizations to exploit the opportunities provided by digitalization of supply chains and will help managers understand the complexity involved
Publisher Correction:Enhanced food-related responses in the ventral medial prefrontal cortex in narcolepsy type 1 (Scientific Reports, (2018), 8, 1, (16391), 10.1038/s41598-018-34647-6)
In the original version of this Article, the author Gert Jan Lammers was incorrectly indexed. This error has now been corrected.</p
Fine sediment in mixed sand-silt environments impact bedform geometry by altering sediment mobility
Geometric characteristics of subaqueous bedforms, such as height, length and leeside angle, are crucial for determining hydraulic form roughness and interpreting sedimentary records. Traditionally, bedform existence and geometry predictors are primarily based on uniform, cohesionless sediments. However, mixtures of sand, silt and clay are common in deltaic, estuarine, and lowland river environments, where bedforms are ubiquitous. Therefore, we investigate the impact of fine sand and silt in sand-silt mixtures on bedform geometry, based on laboratory experiments conducted in a recirculating flume.We systematically varied the fraction of sand and silt for different discharges, and utlized an acoustic Doppler velocimeter to measure flow velocity profiles. The final bed geometry was captured using a line laser scanner. Our findings reveal that the response of bedforms to an altered fine sediment percentage is ambiguous, and likely depends on, among others, bimodality-driven bed mobility and sediment cohesiveness. When fine, non-cohesive material (fine sand or coarse silt) is mixed with the base material (medium sand), an increased dune height and length is observed, possibly caused by the hiding exposure effect, resulting in enhanced mobility of the coarser material. However, weakly cohesive fine silt suppresses dune height and length, possibly caused by reduced sedimentmobility. Finally, in the transition from dunes to upper stage plane bed, there are indications that the bed becomes unstable and dune heights vary over time. The composition of the bed material does not significantly impact the hydraulic roughness, but mainly affects roughness via the bed morphology, especially the leeside angle
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