138 research outputs found
Farm to Table Meteorites: An End to End Exploration of the Solar System’s Past, Present, and Future.
Using Drones and machine learning to recover observed meteorite falls, analysis of extra terrestrial samples, and the future of space mining
Towards Space Efficient Two-Point Shortest Path Queries in a Polygonal Domain
We devise a data structure that can answer shortest path queries for two query points in a polygonal domain P on n vertices. For any ε>0, the space complexity of the data structure is O(n10+ε) and queries can be answered in O(logn) time. Alternatively, we can achieve a space complexity of O(n9+ε) by relaxing the query time to O(log2n). This is the first improvement upon a conference paper by Chiang and Mitchell from 1999. They present a data structure with O(n11) space complexity and O(logn) query time. Our main result can be extended to include a space-time trade-off. Specifically, we devise data structures with O(n9+ε/ℓ4+O(ε)) space complexity and O(ℓlog2n) query time, for any integer 1≤ℓ≤n. Furthermore, we present improved data structures with O(logn) query time for the special case where we restrict one (or both) of the query points to lie on the boundary of P. When one of the query points is restricted to lie on the boundary, and the other query point is unrestricted, the space complexity becomes O(n6+ε). When both query points are on the boundary, the space complexity is decreased further to O(n4+ε), thereby improving an earlier result of Bae and Okamoto
LIPIcs, Volume 258, SoCG 2023, Complete Volume
LIPIcs, Volume 258, SoCG 2023, Complete Volum
Systematic Approaches for Telemedicine and Data Coordination for COVID-19 in Baja California, Mexico
Conference proceedings info:
ICICT 2023: 2023 The 6th International Conference on Information and Computer Technologies
Raleigh, HI, United States, March 24-26, 2023
Pages 529-542We provide a model for systematic implementation of telemedicine within a large evaluation center for COVID-19 in the area of Baja California, Mexico. Our model is based on human-centric design factors and cross disciplinary collaborations for scalable data-driven enablement of smartphone, cellular, and video Teleconsul-tation technologies to link hospitals, clinics, and emergency medical services for point-of-care assessments of COVID testing, and for subsequent treatment and quar-antine decisions. A multidisciplinary team was rapidly created, in cooperation with different institutions, including: the Autonomous University of Baja California, the Ministry of Health, the Command, Communication and Computer Control Center
of the Ministry of the State of Baja California (C4), Colleges of Medicine, and the College of Psychologists. Our objective is to provide information to the public and to evaluate COVID-19 in real time and to track, regional, municipal, and state-wide data in real time that informs supply chains and resource allocation with the anticipation of a surge in COVID-19 cases. RESUMEN Proporcionamos un modelo para la implementación sistemática de la telemedicina dentro de un gran centro de evaluación de COVID-19 en el área de Baja California, México. Nuestro modelo se basa en factores de diseño centrados en el ser humano y colaboraciones interdisciplinarias para la habilitación escalable basada en datos de tecnologías de teleconsulta de teléfonos inteligentes, celulares y video para vincular hospitales, clínicas y servicios médicos de emergencia para evaluaciones de COVID en el punto de atención. pruebas, y para el tratamiento posterior y decisiones de cuarentena. Rápidamente se creó un equipo multidisciplinario, en cooperación con diferentes instituciones, entre ellas: la Universidad Autónoma de Baja California, la Secretaría de Salud, el Centro de Comando, Comunicaciones y Control Informático.
de la Secretaría del Estado de Baja California (C4), Facultades de Medicina y Colegio de Psicólogos. Nuestro objetivo es proporcionar información al público y evaluar COVID-19 en tiempo real y rastrear datos regionales, municipales y estatales en tiempo real que informan las cadenas de suministro y la asignación de recursos con la anticipación de un aumento de COVID-19. 19 casos.ICICT 2023: 2023 The 6th International Conference on Information and Computer Technologieshttps://doi.org/10.1007/978-981-99-3236-
Dynamics and topology of the Hat family of tilings
The recently discovered Hat tiling admits a 4-dimensional family of shape
deformations, including the 1-parameter family already known to yield alternate
monotiles. The continuous hulls resulting from these tilings are all
topologically conjugate dynamical systems, and hence have the same dynamics and
topology. We construct and analyze a self-similar element of this family called
the CAP tiling, and we use it to derive properties of the entire family. The
CAP tiling has pure-point dynamical spectrum, which we compute explicitly, and
comes from a natural cut-and-project scheme with 2-dimensional Euclidean
internal space. All other members of the Hat family, in particular the original
version constructed from 30-60-90 right triangles, are obtained via small
modifications of the projection from this cut-and-project scheme.Comment: 30 pages, 10 figures, 3 tables; slightly expanded and improved
version with additional explanations and result
Quantifying some properties of curves and arcs on hyperbolic surfaces
Motivated by the ergodicity of geodesic flow on the unit tangent bundle of a closed hyperbolic surface and its applications, this thesis includes three parts:
Part 1. We present a type of quantitative density of closed geodesics and orthogeodesics on complete finite-area hyperbolic surfaces. The main results are upper bounds on the length of the shortest closed geodesic and the shortest doubly truncated orthogeodesic that are Y-dense on a given compact set on the surface.
Part 2. We investigate the terms arising in Luo-Tan’s identity, namely showing that they vary monotonically in terms of lengths and that they verify certain convexity properties. Using these properties, we deduce two results. As a first application, we show how to deduce a theorem of Thurston which states, in particular for closed hyperbolic surfaces, that if a simple length spectrum "dominates" another, then in fact the two surfaces are isometric. As a second application, we show how to find upper bounds on the number of pairs of pants of bounded length that only depend on the boundary length and the topology of the surface. This is joint work with Hugo Parlier and Ser Peow Tan.
Part 3. Inspired by a number theoretic application of Bridgeman’s identity, the combinatorial proof of McShane’s identity by Bowditch and its generalized version by Labourie and Tan, we describe a tree structure on the set of orthogeodesics and give a combinatorial proof of Basmajian’s identity in the case of surfaces. We also introduce the notion of orthoshapes with associated identity relations and indicate connections to length equivalent orthogeodesics and a type of Cayley-Menger determinant. As another application, dilogarithm identities following from Bridgeman’s identity are computed recursively and their terms are indexed by the Farey sequence
3-я Міжнародна конференція зі сталого майбутнього: екологічні, технологічні, соціальні та економічні аспекти (ICSF 2022) 24-27 травня 2022 року, м. Кривий Ріг, Україна
Матеріали 3-ої Міжнародної конференції зі сталого майбутнього: екологічні, технологічні, соціальні та економічні аспекти (ICSF 2022) 24-27 травня 2022 року, м. Кривий Ріг, Україна.Proceedings of the 3rd International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2022) 24-27 May 2022, Kryvyi Rih, Ukraine
History of Construction Cultures Volume 2
Volume 2 of History of Construction Cultures contains papers presented at the 7ICCH – Seventh International Congress on Construction History, held at the Lisbon School of Architecture, Portugal, from 12 to 16 July, 2021. The conference has been organized by the Lisbon School of Architecture (FAUL), NOVA School of Social Sciences and Humanities, the Portuguese Society for Construction History Studies and the University of the Azores. The contributions cover the wide interdisciplinary spectrum of Construction History and consist on the most recent advances in theory and practical case studies analysis, following themes such as: - epistemological issues; - building actors; - building materials; - building machines, tools and equipment; - construction processes; - building services and techniques ; -structural theory and analysis ; - political, social and economic aspects; - knowledge transfer and cultural translation of construction cultures. Furthermore, papers presented at thematic sessions aim at covering important problematics, historical periods and different regions of the globe, opening new directions for Construction History research. We are what we build and how we build; thus, the study of Construction History is now more than ever at the centre of current debates as to the shape of a sustainable future for humankind. Therefore, History of Construction Cultures is a critical and indispensable work to expand our understanding of the ways in which everyday building activities have been perceived and experienced in different cultures, from ancient times to our century and all over the world
Investigating Precise Control in Spatial Interactions: Proxemics, Kinesthetics, and Analytics
Augmented and Virtual Reality (AR/VR) technologies have reshaped the way in which we perceive the virtual world. In fact, recent technological advancements provide experiences that make the physical and virtual worlds almost indistinguishable. However, the physical world affords subtle sensorimotor cues which we subconsciously utilize to perform simple and complex tasks in our daily lives. The lack of this affordance in existing AR/VR systems makes it difficult for their mainstream adoption over conventional user interfaces. As a case in point, existing spatial user interfaces (SUI) lack the intuition to perform tasks in a manner that is perceptually familiar to the physical world. The broader goal of this dissertation lies in facilitating an intuitive spatial manipulation experience, specifically for motor control.
We begin by investigating the role of proximity to an action on precise motor control in spatial tasks. We do so by introducing a new SUI called the Clock-Maker's Work-Space (CMWS), with the goal of enabling precise actions close to the body, akin to the physical world. On evaluating our setup in comparison to conventional mixed-reality interfaces, we find CMWS to afford precise actions for bi-manual spatial tasks. We further compare our SUI with a physical manipulation task and observe similarities in user behavior across both tasks.
We subsequently narrow our focus on studying precise spatial rotation. We utilize haptics, specifically force-feedback (kinesthetics) for augmenting fine motor control in spatial rotational task. By designing three kinesthetic rotation metaphors, we evaluate precise rotational control with and without haptic feedback for 3D shape manipulation. Our results show that haptics-based rotation algorithms allow for precise motor control in 3D space, also, help reduce hand fatigue.
In order to understand precise control in its truest form, we investigate orthopedic surgery training from the point of analyzing bone-drilling tasks. We designed a hybrid physical-virtual simulator for bone-drilling training and collected physical data for analyzing precise drilling action. We also developed a Laplacian based performance metric to help expert surgeons evaluate the resident training progress across successive years of orthopedic residency
ポリオミノと格子凸多角形による多層タイル張り
平面図形の集合族Tが隙間や重なりの無いように平面を充填するとき,Tをタイル張りと呼び,Tに属する全ての平面図形が互いに合同であるとき,その平面図形をタイルと呼ぶ.本研究ではこれらを拡張した,平面を層数kで充填するk層タイル張りと,それに属するk層タイルを考える.k層タイル張りは,簡潔に言えば,平面図形の無限個の複製が平面上のほとんど全ての点においてちょうどk回重なるように充填するということを意味する.また,(1層)タイルは任意の正整数kに対して自明にk層タイルであることから,「タイルではないが,k(≥ 2)層タイルではある」という性質を持つ平面図形が研究対象となる.この性質を持つ平面図形を非自明なk層タイルと呼ぶ.k層タイル張りT= {T_1, T_2, T_3, …}に属する全てのT_iがT_1を平行移動させたものであるとき,Tをk層平行移動タイル張りと呼び,T_1をk層平行移動タイルと呼ぶ.多層平行移動タイル張りに関する様々な研究が既に存在するが,回転移動や対称移動も許した上での多層タイル張りに関する研究は存在しないようである.従って本研究では,そのような非自明な多層タイル張りを考える.本論文では,基本的な平面図形として主にポリオミノと格子凸多角形に着目し,いくつかの事実を明らかにする.具体的には以下の通りである.まず,任意の整数k≥2に対し,「任意の正整数h<kに対してh層タイルではないが,k層タイルではある」という性質を持つポリオミノが存在することを示す.また,任意の整数k≥2に対し,非自明なk層タイルであるようなポリオミノのうちセル数が最小のものを明らかにする.次に,k=5と任意の整数k≥7に対し,非自明なk層タイルであるような面積kの格子凸多角形が存在することと,k=2とk=3に対し,そのような格子凸多角形が存在しないことを証明する.電気通信大学202
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