检索结果-内蒙古大学图书馆

A Novel Contour Tracing Algorithm for Object Shape Reconstruction Using Parametric Curves

Computers, Materials & Continua 2023年第4期75卷 331-350页

作者： Nihat Arslan Kali Gurkahraman Defence Technology Programme Sivas University of Science and TechnologySivas58070Turkey Department of Computer Engineering Sivas Cumhuriyet UniversitySivas58140Turkey

Parametric curves such as Bézier and B-splines, originally developedfor the design of automobile bodies, are now also used in image processing andcomputer vision. For example, reconstructing an object shape in an image,including different translations, scales, and orientations, can be performedusing these parametric curves. For this, Bézier and B-spline curves can be generatedusing a point set that belongs to the outer boundary of the object. Theresulting object shape can be used in computer vision fields, such as searchingand segmentation methods and training machine learning algorithms. Theprerequisite for reconstructing the shape with parametric curves is to obtainsequentially the points in the point set. In this study, a novel algorithm hasbeen developed that sequentially obtains the pixel locations constituting theouter boundary of the object. The proposed algorithm, unlike the methods inthe literature, is implemented using a filter containing weights and an outercircle surrounding the object. In a binary format image, the starting point ofthe tracing is determined using the outer circle, and the next tracing movementand the pixel to be labeled as the boundary point is found by the filter ***, control points that define the curve shape are selected by reducing thenumber of sequential points. Thus, the Bézier and B-spline curve equationsdescribing the shape are obtained using these points. In addition, differenttranslations, scales, and rotations of the object shape are easily provided bychanging the positions of the control points. It has also been shown that themissing part of the object can be completed thanks to the parametric curves.

关键词： Contour tracing algorithm bézier curve B-spline curve object shape reconstruction

来源：评论

学校读者我要写书评

暂无评论

Investigating the adsorption potential of char derived from waste latex for methylene blue removal

引用

Chemosphere 2024年 358卷 141936页

作者： Nagarajan, Thachnatharen Vilosamy, Khirthiga Raju, Gunasunderi Shanmugan, Subramani Walvekar, Rashmi Rustagi, Sarvesh Khalid, Mohammad Faculty of Defence Science and Technology National Defence University of Malaysia Kuala Lumpur Malaysia School of Distance Education Universiti Sains Malaysia Minden Penang 11800 Malaysia Pulau Pinang Gelugor11800 Malaysia Faculty of Innovation and Technology School of Engineering Chemical Engineering Programme Taylor's University Malaysia No.1 Jalan Taylor's Selangor Subang Jaya47500 Malaysia Chitkara Centre for Research and Development Chitkara University Himachal Pradesh 174103 India School of Applied and Life Sciences Uttaranchal University Uttarakhand Dehradun248007 India School of Engineering and Technology Sunway University No. 5 Jalan Universiti Bandar Sunway Selangor Petaling Jaya47500 Malaysia Centre of Research Impact and Outcome Chitkara University Punjab 140401 India

This study presents the adsorption of methylene blue (MB) dye using latex char derived from pyrolysis of latex gloves. The adsorption process was investigated systematically using Response Surface Methodology (RSM) with a Central Composite Design (CCD). The effects of four key variables, namely pH, time, temperature, and adsorbent dosage, were studied using a factorial design enriched with center points and axial points. Experimental data were analyzed using a second-order polynomial regression model to construct a response surface model, which elucidated the relationship between the variables and MB removal efficiency. The study found that the char obtained at 800 °C exhibited the highest adsorption capacity due to its increased carbonization, expanded surface area, and diverse pore structure. Analysis of Variance (ANOVA) confirmed the significance of the quadratic model, with remarkable agreement between predicted and experimental outcomes. Diagnostic plots validated the model's reliability, while 3D contour graphs illustrated the combined effects of variables on MB removal efficiency. Optimization using DoE software identified optimal conditions resulting in a 99% removal efficiency, which closely matched experimental results. Additionally, adsorption isotherms revealed that the Freundlich model best described the adsorption behavior, indicating heterogeneous surface adsorption with multilayer adsorption. This comprehensive study provides valuable insights into the adsorption process of MB dye using latex char, with implications for wastewater treatment and environmental remediation. © 2024 Elsevier Ltd

关键词： Pyrolysis

来源：评论

学校读者我要写书评

暂无评论

Enhanced microwave absorption properties of Nd-doped barium hexaferrite and reduced graphene oxide nanocomposites in the X-band

引用

Ceramics International 2025年

作者： Riyaz Mohammad Shahnawaz M. Abushad Azizurrahaman Ansari M.J. Akhtar Himangshu B. Baskey Shahid Husain Wasi Khan Department of Physics Aligarh Muslim University Aligarh-202002 India Materials Science Programme Indian Institute of Technology Kanpur Kanpur-208016 India Department of Physics Shibli National College MSD State University Azamgarh-276001 India Defence Material Store R and D Establishment DRDO Kanpur-208013 India

This study presents the synthesis of neodymium (Nd) doped barium hexaferrite (BHF), with the chemical composition Ba 1- x Nd x Fe 12 O 19 (where x = 0 to 0.20), and its nanocomposites with reduced graphene oxide (rGO) in order to investigate the microwave absorption properties within the X-band of microwave frequency. Pristine and Nd doped BHF nanopowders were synthesized via the sol-gel auto-combustion process, while the nanocomposites were prepared using the sonochemical method. X-ray diffraction (XRD) analysis established the successful formation of the desired BHF phase, as well as the formation of rGO and their nanocomposites. Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy were employed to confirm the structural integrity of the nanocomposite, providing evidence of distinct vibrational bands associated with its formation. The thermal stability of the synthesized nanocomposite was analyzed using Thermogravimetric analysis (TGA) over the temperature range of 30-800 o C. The surface morphology of the synthesized Nd doped BHF/rGO/epoxy resin nanocomposites was examined using scanning electron microscopy (SEM). The microwave absorption characteristics of the undoped and Nd doped BHF/rGO/epoxy resin nanocomposites were evaluated using a vector network analyzer (VNA) in the X-band of microwave frequency (8.2-12.4 GHz). Among the synthesized samples, 3 mm thick Ba 0.80 Nd 0.20 Fe 12 O 19 /rGO-epoxy nanocomposite resulted a minimum reflection loss of -22.2 dB at 10.5 GHz with an effective bandwidth of 2.5 GHz. The remarkable material properties, along with excellent microwave absorption performance, make the nanocomposites promising candidates for electromagnetic shielding and microwave absorption applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Assuring the machine learning lifecycle: Desiderata, methods, and challenges

arXiv

引用

arXiv 2019年

作者： Ashmore, Rob Calinescu, Radu Paterson, Colin Defence Science and Technology Laboratory United Kingdom University of York and Assuring Autonomy International Programme United Kingdom

Machine learning has evolved into an enabling technology for a wide range of highly successful applications. The potential for this success to continue and accelerate has placed machine learning (ML) at the top of research, economic and political agendas. Such unprecedented interest is fuelled by a vision of ML applicability extending to healthcare, transportation, defence and other domains of great societal importance. Achieving this vision requires the use of ML in safety-critical applications that demand levels of assurance beyond those needed for current ML applications. Our paper provides a comprehensive survey of the state-of-the-art in the assurance of ML, i.e. in the generation of evidence that ML is sufficiently safe for its intended use. The survey covers the methods capable of providing such evidence at different stages of the machine learning lifecycle, i.e. of the complex, iterative process that starts with the collection of the data used to train an ML component for a system, and ends with the deployment of that component within the system. The paper begins with a systematic presentation of the ML lifecycle and its stages. We then define assurance desiderata for each stage, review existing methods that contribute to achieving these desiderata, and identify open challenges that require further research. Copyright © 2019, The Authors. All rights reserved.

关键词： Surveys

来源：评论

学校读者我要写书评

暂无评论

Mpox vaccination strategies in DR Congo

引用

The Lancet. Global health 2025年第3期13卷 e416页

作者： Oyelola A Adegboye Andrew M Adamu Adeshina I Adekunle Theophilus I Emeto Anyebe B Onoja Paul F Horwood Menzies School of Health Research Charles Darwin University Casuarina NT 0811 Australia Public Health and Tropical Medicine James Cook University Townsville QLD Australia Australian Institute of Tropical Health and Medicine James Cook University Townsville QLD Australia Centre for Tropical Biosecurity James Cook University Townsville QLD Australia. Electronic address: oyelola.adegboye@menzies.edu.au. Centre for Tropical Biosecurity James Cook University Townsville QLD Australia Veterinary Sciences Discipline James Cook University Townsville QLD Australia. Defence Science and Technology Group Department of Defence Melbourne VIC Australia. Australian Institute of Tropical Health and Medicine James Cook University Townsville QLD Australia. World Health Organization Health Emergencies Programme Geneva Switzerland Department of Virology College of Medicine University of Ibadan Ibadan Nigeria.

来源：评论

学校读者我要写书评

暂无评论

Understanding the service desk: Applied forecasting and analytics approach

Understanding the service desk: Applied forecasting and anal...

引用

2017 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2017

作者： Jie, Ng Jun Enterprise IT Programme Centre Defence Science and Technology Agency Singapore

ISBN: (纸本)9781538609484

In this paper, the study aimed to identify the best forecasting model to represent I-Helpdesk, service desk of an Information technology (IT) project under the Singapore's Ministry of defence (MINDEF), in the aspect of Service Requests management. defence Science and technology Agency (DSTA) support MINDEF users in the area of technical consultancy and project management areas such as resource allocation management for IT service delivery and excellence. To achieve an overall aim of better service delivery for their system users, we intend to answer questions such as: How should we plan the helpdesk staffing for the next week/month? © 2017 IEEE.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

Aircraft seating - Boarding mass investigations: Understanding the implications of exceeding design and qualification limits 55

Aircraft seating - Boarding mass investigations: Understandi...

引用

55th Annual SAFE Symposium 2017

作者： Butcher, Richard Aircrew Systems Research Programme Defence Science and Technology Laboratory United Kingdom

来源：评论

学校读者我要写书评

暂无评论

An Evaluation of Superconducting Power Cables for Airborne Application

An Evaluation of Superconducting Power Cables for Airborne A...

引用

2018 AIAA/IEEE Electric Aircraft Technologies Symposium, EATS 2018

作者： Rivenc, Jean Peres, Gilles Berg, Frederick Prisse, Lucien Rostek, Peter Melyukov, Dmitry Amelichev, Vadim Samoilenkov, Sergey Airbus SAS Toulouse France Airbus Defence and Space GmbH Ottobrunn Germany Airbus Russia Moscow Russia SuperOx Company Moscow Russia Central Research and Technology Department Airbus Toulouse France Airbus Central Research and Technology Department Airbus Toulouse France Propulsion Performance Engineering Department Airbus Ottobrunn Germany E-Aircraft Systems Programme Airbus Ottobrunn Germany

ISBN: (纸本)9781624105722

In the frame of more electrical aircrafts and of a strong increase of embedded electrical power, HTS (high temperature superconductors) technologies have to be carefully evaluated. In this study, the performances of HTS cables are presented, for an airborne application. The capacities of HTS cables, in terms of carrying current, are quantified. A harness is proposed for DC and AC-3phases application. The conductors sizing is explained in order to carry a current of2000ADC and 1400Arms in AC, by using several HTS tapes of 4mm wide and 60 m thick, when a section around lSOOmm2 would be required with conventional aluminium cables. The ability of the cables to work under voltages up to 5kV, is also demonstrated. The robustness of tested cables design, regarding abusive conditions, is presented in two cases: a failure of the liquid nitrogen pump, and a short-circuit of 10kA peak, 50 Hz, during 100ms. A mass comparison is proposed, between conventional aluminium cables from one side, and HTS cables mass with all cooling components, from the other side. The network characteristics (voltage, power and length) are discussed, for which HTS cables have an interest in terms of mass, vs conventional cables. From the presented figures and result, it is analyzed why, for an airborne application, the reflection should not be limited to cables and, on the contrary, shall be widen to a power architecture made of HTS components. © 2018 AIAA.

关键词： High temperature superconductors

来源：评论

学校读者我要写书评

暂无评论

I see sick people: Beliefs about sensory detection of infectious disease are largely consistent across cultures

引用

Brain, Behavior, and Immunity 2025年 128卷 737-750页

作者： Ackerman, Joshua M. Samore, Theodore Fessler, Daniel M.T. Kupfer, Tom R. Choi, Soyeon Merrell, Wilson N. Aarøe, Lene Aavik, Toivo Acabado, Stephen Akello, Grace Alfian, Ilham N. Al-Shawaf, Laith Alvarez, Marinés M. Ammann, Jeanine Arikan, Gizem Asha, Saiyeda A. Astobiza, Anibal M. Baeza-Ugarte, Carmen G. Barclay, Pat Barlow, Fiona Kate Bizarro, Lisiane Bressan, Paola Castellanos-Chacón, Andres Choy, Bryan K.C. Chusairi, Achmad Contreras-Garduño, Jorge Chávez Cosamalón, Brenda L. Costa-Neves, Bernardo De, Mallika de Lima, Tiago J.S. de Zoysa, Piyanjali Dryžaitė, Ieva Elbæk, Christian T. Fedor, Peter Fernández, Ana M. Fernandez-Morales, Regina Fülöp, Márta Gamsakhurdia, Vladimer Lado Garcia-Gómez, Leonor Garcia-Marques, Leonel Garduño-Franco, Jimena Pilar Grazioso, María del Habacht, Fanny Hasan, Youssef Haugestad, Camila P. Haugestad, Christian A.P. Havlíček, Jan Hernandez, Earl J. Hoang, Vu M. Hong, Minsung Hromatko, Ivana Iliško, Dzintra Imada, Hirotaka Jakšić, Ivana Jarmakowski, Tomasz Hjördísar Jónsdóttir, Harpa L. Kajokaite, Kotrina Kaňková, Šárka Kervyn, Nicolas Kim, Jinseok P. Kunst, Jonas R. Laakasuo, Michael Leongómez, Juan David Li, Norman P. Lu, Junsong Lynch, Nathan Maegli, María A. Manley, Harry Marcu, Gabriela McAfee, Thea Mitkidis, Panagiotis Molnár, Nándor B. Morvinski, Coby Muhamad, Haslina Nejat, Pegah Huy, Hoang Nguyen Oliveira, Angelica N. Olsson, Mats J. Onyishi, Charity N. Onyishi, Ike E. Orozco, Reegan Otterbring, Tobias Ottersen, Ida S. Pacheco-López, Gustavo Panagiotopoulou, Penny Paniagua, Walter Parvin, Roksana Pavlović, Zoran Prokop, Pavol Raffman, Emma Rizwan, Muhammad Rojas, Sheila Różycka-Tran, Joanna Sánchez, Oscar R. Selim, Heyla Sevi, Barış Shani, Yaniv Shastry, Madhulika S. Stieger, Stefan Suh, Eunkook M. Sumari, Melati Takemura, Kosuke Tognetti, Arnaud Trombetta, Roberta Z.R. Tybur, Joshua M. Ucak, Eylul B. Uchida, Yukiko Valentova, Jaroslava V. Viciana, Hugo Visine, Amandine Wang, Jin Wang, XT Yahiiaiev, Illia I. Zein, Rizqy A. Žeželj, Iris Department of Psychology University of Michigan Ann Arbor MI United States Religion Programme University of Otago Dunedin New Zealand Department of Anthropology University of California Los Angeles Los Angeles CA United States Center for Behavior Evolution & Culture University of California Los Angeles Los Angeles CA United States Bedari Kindness Institute University of California Los Angeles Los Angeles CA United States Department of Psychology Nottingham Trent University England Nottingham United Kingdom Department of Psychology University of Wisconsin-Madison Madison WI United States Center for the Experimental-Philosophical Study of Discrimination Aarhus University Aarhus Denmark Department of Political Science Aarhus University Aarhus Denmark Institute of Psychology University of Tartu Tartu Estonia Department of Mental Health Faculty of Medicine Gulu University Gulu Uganda Department of Psychology Universitas Airlangga East Java Indonesia Department of Psychology University of Colorado Colorado Springs Colorado Springs CO United States Department of Psychology Universidad del Valle Guatemala Guatemala City Guatemala Agroscope Research group Economic Modelling and Policy Analysis Ettenhausen Switzerland Department of Political Science Trinity College Dublin Dublin Ireland Department of Psychology International University of Business Agriculture and Technology Dhaka Bangladesh Department of Philosophy University of Granada Granada Spain Department of Psychology University of Guelph Guelph ON Canada School of Psychology University of Queensland Brisbane QLD Australia Graduate Program in Psychology Universidade Federal do Rio Grande Do Sul RS Porto Alegre Brazil Department of General Psychology University of Padova Padova Italy Faculty of Psychology Universidad El Bosque Bogotá Colombia Ministry of Defence Singapore Sustainability and Education Policy Network Saskatoon SK Canada Escuela Nacional de Estudios Superiores unid

Identifying cues to contagious disease is critical for effectively tracking and defending against interpersonal infection threats. People hold lay beliefs about the types of sensory information most relevant for identifying whether others are sick with transmissible illnesses. Are these beliefs universal, or do they vary along cultural and ecological dimensions? Participants in 58 countries (N = 19,217) judged how effective, and how likely they were to use, cues involving each of the five major sensory modalities in an imagined social interaction during a flu outbreak. Belief patterns were strongly consistent across countries (sight > audition > touch > smell > taste), suggesting a largely universal conceptualization of the role of sensory information for interpersonal respiratory disease detection. Results also support a safe senses hypothesis, with perceivers reporting that they would use senses that function at a distance—and thus reduce pathogen transmission risk—more than would be expected given participants’ beliefs as to the efficacy of these senses for disease detection. Where societal variation did emerge, it was captured by a cohesive set of socio-ecological factors, including human development, latitude, pathogen prevalence, and population density. Together, these findings reveal a shared lens through which contagious respiratory disease is assessed, one that prioritizes minimizing risk to perceivers, and may offer leverage for designing interventions to improve public health. © 2025 Elsevier Inc.

关键词： Behavioral immune system Culture Iterpersonal perception Pathogen threat Sensation Threat detection

来源：评论

学校读者我要写书评

暂无评论

Half-sweep successive over relaxation iterative method to solve two-point fuzzy boundary value problems

引用

AIP Conference Proceedings 2015年第1期1682卷

作者： A. A. Dahalan M. S. Muthuvalu J. Sulaiman aDepartment of Mathematics Centre for Defence Foundation Studies National Defence University of Malaysia 57000 Kuala Lumpur Malaysia cMathematics with Economics Programme Faculty of Science &Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia bDepartment of Fundamental and Applied Sciences Faculty of Science and Information Technology Universiti Teknologi PETRONAS 31750 Tronoh Perak Malaysia

This study deals with the application of numerical methods in solving the fuzzy boundary value problems (FBVPs) which is discretized to derive second order fuzzy finite difference approximation equation. Then this fuzzy approximation equation is used to generate the fuzzy linear system. In addition to that, the fuzzy linear system will be solved iteratively by using Gauss-Seidel (GS), Full-Sweep Successive Over-Relaxation (FSSOR) and Half-Sweep Successive Over Relaxation (HSSOR) iterative methods. Then several numerical experiments are conducted to illustrate the effectiveness of HSSOR iterative method compared with the GS and FSSOR methods.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：