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arXiv 2017年

作者： Ögren, Magnus Nyström, Marcus Jarodzka, Halszka Dep. of Applied Mathematics and Computer Science Technical University of Denmark Nano-Science Center Department of Chemistry University of Copenhagen Denmark School of Science and Technology Örebro University ÖrebroSE-701 82 Sweden Helgonabacken 12 Lund Sweden Valkenburgerweg 177 Heerlen6419 AT Netherlands

Textbooks in applied mathematics often use graphs to explain the meaning of formulae, even though their benefit is still not fully explored. To test processes underlying this assumed multimedia effect we collected performance scores, eye movements, and think-aloud protocols from students solving problems in vector calculus with and without graphs. Results showed no overall multimedia effect, but instead an effect to confirm statements that were accompanied by graphs, irrespective of whether these statements were true or false. Eye movement and verbal data shed light on this surprising finding. Students looked proportionally less at the text and the problem statement when a graph was present. Moreover, they experienced more mental effort with the graph, as indicated by more silent pauses in thinking aloud. Hence, students actively processed the graphs. This, however, was not sufficient. Further analysis revealed that the more students looked at the statement, the better they performed. Thus, in themultimedia condition the graph drew students' attention and cognitive capacities away from focusing on the statement. A good alternative strategy in the multimedia condition was to frequently look between graph and problem statement, and thus to integrate their information. In conclusion, graphs influence where students look and what they process, and may even mislead them into believing accompanying information. Thus, teachers and textbook designers should be very critical on when to use graphs and carefully consider how the graphs are integrated with other parts of the problem. Copyright © 2017, The Authors. All rights reserved.

关键词： Graphic methods

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Development of biometrie palm vein trait based person recognition system: Palm vein biometrics system

Development of biometrie palm vein trait based person recogn...

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International Conference on Intelligent Systems and Information Management (ICISIM)

作者： Shriram D. Raut V. T. Humbe Arjun V. Mane Dept. of Computer Science Solapur University Solapur Solapur India School of Technology S. R. T. M. University Latur India Dep. of Digital and Cyber Forensic Govt. Institute of Forensic Science Nagpur India

ISBN: (纸本)9781509042654;9781509042647

Biometrie Authentication is the main stream to attract attention of researcher to develop algorithm for data and security concern. The palm vein biometric is emerging as the most promising physiological characteristic to develop efficient recognition system. This paper discuss about the new dimension to generate biometric trait key rather a template free key generation extracted by means of rigorous pattern recognition and information security tactics. The generation of key is exercised through mapping of certain digital image processing operation, distance metric computation and information security policies. The model of recognition system proposed that includes phases such as feature extraction and detection followed by the development of recognition technique based on unique and distinct detected palm vein feature characteristics. The proposed work gives novel and robust algorithm for the recognition of the subject. The experimental work gives result with 99.47% high rate of accuracy for the recognition of the subject.

关键词： Veins Feature extraction Image edge detection Blood Biomedical imaging Gabor filters Euclidean distance

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A PTC Scheme for Internet of Things: Private-Trust-Confidentiality

A PTC Scheme for Internet of Things: Private-Trust-Confident...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Chih-Hsueh Lin Wen-Shyong Hsieh Fu Mo Ming-Hao Chang Dep. of Computer and Communication Shu-Te University Taiwan Dep. of Computer Science and Engineering National Sun Yat-sen University Taiwan Dep. of Computer Science Guangdong University of Science and Technology Dongguan China

ISBN: (纸本)9781509024629

Privacy, trust and confidentiality are the main issues of sensor layer in Internet of Things (IOT). In sensor layer, the sensing information must be transmitted from sensor node to gather node by multiple hopping. Every sensor node will be the sender and the relay node to forward the sensing information sent by other nodes. In this paper, BS embeds S+1 secret into the keys that are derived from the real identity of sensor node, to be as the private secret keys for every sensor node. One of the secret is the common secret that is owned by all sensor nodes, the rest S secretes are the random secret used for making mutual trust. Based on the secret index set and private secret keys, we propose a mutual trust method to explore the trust types and the pairing value among the sensor nodes without any negotiating process. To deny the right of malicious nodes to make trust with other nodes, we involve a group key to hash the secret index set to do making trust and pairing value mutually. Based on the trust types and the pairing values, the sensor nodes can set a secure path to deliver the sensing information to base station.

关键词： Indexes Public key Wireless sensor networks Radiation detectors Broadcasting Internet of things

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TOI-4860 b, a short-period giant planet transiting an M3.5 dwarf

arXiv

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arXiv 2023年

作者： Almenara, J.M. Bonfils, X. Bryant, E.M. Jordán, A. Hébrard, G. Martioli, E. Correia, A.C.M. Astudillo-Defru, N. Cadieux, C. Arnold, L. Artigau, É. Bakos, G.Á. Barros, S.C.C. Bayliss, D. Bouchy, F. Boué, G. Brahm, R. Carmona, A. Charbonneau, D. Ciardi, D.R. Cloutier, R. Cointepas, M. Cook, N.J. Cowan, N.B. Delfosse, X. do Nascimento, J. Dias Donati, J.-F. Doyon, R. Forveille, T. Fouqué, P. Gaidos, E. Gilbert, E.A. da Silva, J. Gomes Hartman, J.D. Hesse, K. Hobson, M.J. Jenkins, J.M. Kiefer, F. Kostov, V.B. Laskar, J. Lendl, M. L'Heureux, A. Martins, J.H.C. Menou, K. Moutou, C. Murgas, F. Polanski, A.S. Rapetti, D. Sedaghati, E. Shang, H. Univ. Grenoble Alpes CNRS IPAG GrenobleF-38000 France Observatoire de Genève Département d’Astronomie Université de Genève Chemin Pegasi 51b Versoix1290 Switzerland Mullard Space Science Laboratory University College London Holmbury St Mary Dorking SurreyRH5 6NT United Kingdom Department of Physics University of Warwick Coventry United Kingdom Facultad de Ingeniería y Ciencias Universidad Adolfo Ibáñez Av. Diagonal las Torres 2640 Peñalolén Santiago Chile Santiago Chile Data Observatory Foundation Chile Institut d’astrophysique de Paris UMR7095 CNRS Université Pierre & Marie Curie 98bis boulevard Arago Paris75014 France Observatoire de Haute-Provence CNRS Université d’AixMarseille Saint-Michel-l’Observatoire04870 France Laboratório Nacional de Astrofísica Rua Estados Unidos 154 MG Itajubá37504-364 Brazil CFisUC Departamento de Física Universidade de Coimbra Coimbra3004-516 Portugal IMCCE UMR8028 CNRS Observatoire de Paris PSL University Sorbonne Univ. 77 av. Denfert-Rochereau Paris75014 France Departamento de Matemática y Física Aplicadas Universidad Católica de la Santísima Concepción Alonso de Rivera Concepción2850 Chile Université de Montréal Département de Physique Institut Trottier de Recherche sur les Exoplanètes MontréalQCH3C 3J7 Canada Corporation CNRS UAR2208 65-1238 Mamalahoa Hwy KamuelaHI96743 United States Department of Astrophysical Sciences Princeton University NJ08544 United States Instituto de Astrofísica e Ciências do Espaço Universidade do Porto CAUP Rua das Estrelas Porto4150-762 Portugal Departamento de Fisica e Astronomia Faculdade de Ciencias Universidade do Porto Rua Campo Alegre Porto4169-007 Portugal Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States NASA Exoplanet Science Institute Caltech/IPAC 1200 E. California Blvd PasadenaCA91125 United States Department of Physics & Astronomy McMaster University 1280 Main St W HamiltonONL8S 4L8 Canad

We report the discovery and characterisation of a giant transiting planet orbiting a nearby M3.5V dwarf (d = 80.4 pc, G = 15.1 mag, K=11.2 mag, R• = 0.358 ± 0.015 R, M• = 0.340 ± 0.009 M). Using the photometric time series from TESS sectors 10, 36, 46, and 63 and near-infrared spectrophotometry from ExTrA, we measured a planetary radius of 0.77 ± 0.03 RJ and an orbital period of 1.52 days. With high-resolution spectroscopy taken by the CFHT/SPIRou and ESO/ESPRESSO spectrographs, we refined the host star parameters ([Fe/H] = 0.27 ± 0.12) and measured the mass of the planet (0.273 ± 0.006 MJ). Based on these measurements, TOI-4860 b joins the small set of massive planets (> 80 ME) found around mid to late M dwarfs (J, but additional data would be needed to confirm this. © 2023, CC BY.

关键词： Spectroscopic analysis

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TEM Characterization of the Edges of CsPb2Br5 Perovskite Crystals

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Microscopy and Microanalysis 2018年第S1期24卷 1984-1985页

作者： Hector A. Calderon Francisco Robles-Hernandez Yanan Wang Chong Wang Xinghua Su Viktor G. Hadjiev Yizhou Ni Md Kamrul Alam Yan Yao Yu Yang Instituto Politecnico Nacional ESFM Depto. Fisica CDMX Mexico 07338 Inst. of Fund. Frontier Scie. U. of Electronic Science and Technology Sichuan610054 China Dep. of Electrical and Computer Engineering University of Houston Houston Texas77204 USA Inst. of Optoel. Inf. Mat. School of Mat. Sci. and Eng. Yunnan University Kunming 650091 China School of Materials Science and Engineering Chang'an University Xi'an Shaanxi710061 China Texas Center for Superconductivity University of Houston Houston TX77204 USA Department of Mechanical Engineering University of Houston Houston TX77204 USA Department of Physics University of Houston Houston Texas77204 USA Materials Science & Engineering University of Houston Houston Texas77204 USA

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The effects of machining strategies of magnetic assisted roller burnishing on the resulted surface structure

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IOP Conference Series: Materials science and Engineering 2018年第1期448卷

作者： Zsolt Kovács Zsolt János Viharos János Kodácsy John von Neumann University GAMF Faculty of Engineering and Computer Science Dep. of Vehicle Technology Kecskemét H-6000 Hungary Department of Manufacturing Science and Technology Budapest University of Technology and Economics Budapest H-1111 Hungary Institute for Computer Science and Control of the Hungarian Academy of Sciences Kende u. 13-17 Budapest H-1111 Hungary John von Neumann University Faculty of Economics and Business Department of Economics and Law Kecskemét H-6000 Hungary

The aim of this paper is to investigate the effect of different burnishing strategy on a C45 steel machining. Burnishing is a well-known, cold working surface improving technology, it is usually applied for cylindrical workpiece. In the reported research a novel developed magnetic assisted ball burnishing (MABB) tool was applied which was designed for MABB machining of flat and harmonic surfaces. To increase its efficiency, different types of machining strategies were applied. After the burnishing process the machined surfaces were measured by surface roughness tester to determine the most important Rsk and Rku tribological parameters. According to the results it can be stated that all different burnishing strategies have special application areas where they can be used efficiently (e.g. sliding surface, moulding tool and after- or pre-machining for ultra-precision machining).

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A proposal for DSO bandwidth extension through synchronous time interleaving

A proposal for DSO bandwidth extension through synchronous t...

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IEEE Instrumentation and Measurement technology Conference

作者： Massimo D'Apuzzo Mauro D'Arco Michele Vadursi Dep. Computer Science and Electrical Engineering University of Naples Federico II Naples ITALY Dep. of Technology University of Naples Parthenope Naples ITALY

ISBN: (纸本)9781467392211

Data transfer rates for aggregated video data stream and within data centers nowadays require an electrical bandwidth up to 100 GHz. This poses big challenges for the design of proper test and measurement solutions, notably related to the acquisition of signals with such a wide bandwidth. To grant sufficient bandwidth and related sample rate, modern oscilloscopes have been using techniques based on frequency-interleaving and time-interleaving, respectively. Earlier this year, an alternative technique has been presented in a white paper [1],[2] based on which an oscilloscope that can offer an electrical bandwidth that is two times that of the adopted ADC has been launched. This result is obtained by combining the operations of a couple of time interleaved channels, each one made up of a mixer followed by an ADC. The paper presents a synchronous time interleaving technique, which can be regarded as an extension of the aforementioned technique. In fact, the proposed technique can be implemented through an architecture that includes four channels, each one including a mixer and an ADC, the latter having an input bandwidth equal to just one fourth the electrical bandwidth achieved by the system.

关键词： Bandwidth Mixers Frequency modulation Oscilloscopes Real-time systems Clocks

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6th international workshop on personalization approaches in learning environments (PALE 2016): Preface 24

6th international workshop on personalization approaches in ...

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24th ACM Conference on User Modeling, Adaptation and Personalisation, UMAP 2016

作者： Kravcik, Milos Boticario, Jesus G. Santos, Olga C. Bielikova, Maria Informatik 5 RWTH Aachen University Germany ADeNu Research Group Artificial Intelligence Dep. Computer Science School UNED Spain PeWe Research Group Faculty of Informatics and Information Technologies Slovak University of Technology in Bratislava Slovakia

Personalization approaches in learning environments are crucial to foster effective, active, efficient, and satisfactory learning. The focus of the PALE workshop series is on the different and complementary perspectives in which personalization can be addressed in learning environments (e.g., informal, workplace, lifelong, mobile, contextualized, and self-regulated learning) and offers an opportunity to present and discuss a wide spectrum of issues and solutions. In particular, this sixth edition includes 12 papers dealing with emotional engagement, affective states, personality, deep learning and complex skills, learning analytics and recommendations, educational data mining, lifelong learning, open learner models, as well as adaptive MOOCs.

关键词： Data mining

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Dynamically Detecting DOM-Related Atomicity Violations in JavaScript with Asynchronous Call

Dynamically Detecting DOM-Related Atomicity Violations in Ja...

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International Conference on Software Analysis, Testing and Evolution (SATE)

作者： Dezhi Wang Lei Xu Baowen Xu Weifeng Zhang Dep. of Computer Science and Technology Nanjing University China School of Computer Nanjing University of Posts and Telecommunication Nanjing China

ISBN: (纸本)9781509045181

In Web applications, atomicity violations caused by AJAX (Asynchronous JavaScript and XML) generate non-determinism and inconsistency. This paper introduces a dynamical detecting approach for atomicity violations in AJAX. Implemented based on Jalangi, an existing instrumentation framework, our technique monitors the execution of a Web application and tracks the Function Callback Flow to find atomic regions by taint analysis. Next, we build a dynamic event model, so as to precisely record the related DOM elements in call and callback steps with low overhead. Then we develop an event-based algorithm to acquire the results, which are classified into different severity levels (benign or harmful). Finally, we conduct an empirical experiment on a subset of Alexa top-ranked websites. Our tool detects 175 DOM related atomicity violations in which 48.6% of violations are identified as harmful after manual inspection.

关键词： HTML Arrays Browsers Runtime Software Instruments

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Call Admission Control in Small Cell Networks with Retrials and Guard Channels

Call Admission Control in Small Cell Networks with Retrials ...

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IEEE Global Communications Conference

作者： Leila Charabi Nawel Gharbi Jalel Ben-Othman Lynda Mokdad National Computer science Engineering School ESI Algiers Dep. of Computer Science University of Sciences and Technology USTHB Dep. of Computer Science L2TI laboratory University of Paris 13 LACL Laboratory University of Paris-Est Creteil

ISBN: (纸本)9781509013296

Recent trends in mobile cellular networks turn towards dep.oyment of Small Cell Networks (SCNs), where the cell size gets smaller and thus the number of subscribers served in a cell will be relatively smaller and should be considered finite. However, almost works on cellular mobile networks consider an infinite population cell, resulting commonly in infinite queueing models, for which no analytical solution is available for performance measures and only numerical approximations can be obtained. In this paper, a Call Admission Control (CAC) in a finite population micro-cell operating in a SCN, with retrials of blocked new calls, impatience of subscribers and multiple guard channels dedicated to handoff calls, is proposed. For the numerical computation of the steady-state probabilities of the corresponding continuous time Markov chain (CTMC), an efficient algorithm giving automatically the infinitesimal generator is developed, and various performance measures are established in network parameters and stationary probabilities. The guard channels number and retrials effect on the network performance in terms of blocking probability (for new calls and retrials) and dropping probability (of handoffs) is also carried out via experimental results.

关键词： Sociology Statistics Biological system modeling Analytical models computer architecture Microprocessors Numerical models

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