210 research outputs found
Linkage Mechanisms Governed by Integrable Deformations of Discrete Space Curves
A linkage mechanism consists of rigid bodies assembled by joints which can be
used to translate and transfer motion from one form in one place to another. In
this paper, we are particularly interested in a family of spacial linkage
mechanisms which consist of -copies of a rigid body joined together by
hinges to form a ring. Each hinge joint has its own axis of revolution and
rigid bodies joined to it can be freely rotated around the axis. The family
includes the famous threefold symmetric Bricard6R linkage also known as the
Kaleidocycle, which exhibits a characteristic "turning over" motion. We can
model such a linkage as a discrete closed curve in with a
constant torsion up to sign. Then, its motion is described as the deformation
of the curve preserving torsion and arc length. We describe certain motions of
this object that are governed by the semi-discrete mKdV equations, where
infinitesimally the motion of each vertex is confined in the osculating plane
Imitation-regularized Optimal Transport on Networks: Provable Robustness and Application to Logistics Planning
Network systems form the foundation of modern society, playing a critical
role in various applications. However, these systems are at significant risk of
being adversely affected by unforeseen circumstances, such as disasters.
Considering this, there is a pressing need for research to enhance the
robustness of network systems. Recently, in reinforcement learning, the
relationship between acquiring robustness and regularizing entropy has been
identified. Additionally, imitation learning is used within this framework to
reflect experts' behavior. However, there are no comprehensive studies on the
use of a similar imitation framework for optimal transport on networks.
Therefore, in this study, imitation-regularized optimal transport (I-OT) on
networks was investigated. It encodes prior knowledge on the network by
imitating a given prior distribution. The I-OT solution demonstrated robustness
in terms of the cost defined on the network. Moreover, we applied the I-OT to a
logistics planning problem using real data. We also examined the imitation and
apriori risk information scenarios to demonstrate the usefulness and
implications of the proposed method
指尖部再建術後における患者満足度とハンドパフォーマンスについての後ろ向き検討
Introduction: Hand performance tests that evaluate hand dexterity and use in daily living have been frequently used to evaluate outcomes in patients with various hand disorders but not in patients with fingertip injuries. The present study aimed to evaluate patient satisfaction and hand performance following digital artery flap reconstruction for fingertip injury and identify factors associated with these outcomes. Methods: This retrospective cohort study included 25 patients with amputation injuries at our institution between 2003 and 2013. Patients with amputations at the Tamai 1 or 2 zone of their index (14 patients) or middle finger (11 patients) who underwent digital artery flap surgery and were followed up for > 1 year were included. Follow-up evaluations were conducted at an average of 44 months postoperatively (range, 12–105 months). The primary outcomes were patient satisfaction and hand performance determined by a 4-grade Likert scale and the Purdue Pegboard test, respectively. Secondary outcomes were recovery of sensitivity measured by Semmes–Weinstein monofilaments, total active finger motion (TAM), and tip pinch strength.
Results: There were no postoperative complications. Patient satisfaction was rated as fair, good, and excellent, in 1, 15, and 9 patients, respectively. The average hand performance test scores were significantly lower in the affected finger than the adjacent finger (22 vs. 30, respectively; p < 0.05). The mean ± standard deviation (SD) sensitivity test score was 3.5 ± 1.6 (range, 2.4–4.0). The average percentage TAM and tip pinch strength compared with the contralateral hand were 82 (range, 45–100%) and 82% (range, 60–112%), respectively. The hand performance score significantly correlated with the recovery of sensitivity and age (r = – 0.42 and 0.43, respectively; both p < 0.05). Patient satisfaction was significantly correlated with TAM (r = 0.42, p < 0.05) and tended to correlate with the recovery of sensitivity (r = – 0.395, p = 0.051). Conclusion: Although reconstructed fingers had a lower performance score than the adjacent fingers, patient satisfaction with flap surgery was relatively high. Recovery of finger sensitivity contributed to patient satisfaction and enhanced dexterity of motor skill activities following fingertip reconstruction.博士(医学)・乙第1410号・平成29年11月24日Copyright © 2017 by Thieme Medical Publishers, Inc.This journal is published under the Creative Commons license CC BY-NC-ND (Attribution-NonCommercial-NoDerivatives : https://creativecommons.org/licenses/by-nc-nd/4.0/)The definitive version is available at " http://dx.doi.org/10.1055/s-0037-1604157
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